CN100545205C - The preparation method of polypropylene mixture alloy for rotationally molding - Google Patents

The preparation method of polypropylene mixture alloy for rotationally molding Download PDF

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CN100545205C
CN100545205C CNB2007100690613A CN200710069061A CN100545205C CN 100545205 C CN100545205 C CN 100545205C CN B2007100690613 A CNB2007100690613 A CN B2007100690613A CN 200710069061 A CN200710069061 A CN 200710069061A CN 100545205 C CN100545205 C CN 100545205C
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polypropylene
preparation
photostabilizer
toughner
thermo
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CN101067033A (en
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房华江
孙绍灿
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FANG HUAJIANG SUN SHAOCAN
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FANG HUAJIANG SUN SHAOCAN
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature

Abstract

The preparation method of polypropylene mixture alloy for rotationally molding, this preparation method is as follows: polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer are mixed by proportioning after hopper changes in the response type forcing machine, simultaneously with linking agent and additional crosslinker with dissolution with solvents after charging opening inject in the reactive extruder, material is at response type forcing machine internal reaction and extrude, granulation.The alloy material that makes with this patent can satisfy the requirement that rotation molding and goods use, and its popularization, uses and has great society and economic benefit.

Description

The preparation method of polypropylene mixture alloy for rotationally molding
(1) technical field
The present invention relates to a kind of preparation method of polypropylene mixture alloy for rotationally molding, it is particularly a kind of that what be used for that rotation molding uses is base material with the polypropylene, add auxiliary agents such as toughner, expanding material, linking agent and stablizer, formed the preparation method of blend alloy through chemical reaction.
(2) background technology
At present, in plastic shaping, rotational moulding with injection moulding, extrude, that proportion is compared in blowing is less, but because it has characteristics such as goods internal stress free, no seam and reduced investment, particularly to few, the oversized abnormal member of quantity also non-it do not belong to.Thereby at present under the situation that other moulding development ease up in the world, rotation molding every year is still with the rapid growth of 10%-15% only.Domestic rotational moulding industry and advanced international standard differ far away, and in recent years, the user is developed very fast to the approval gradually of rotomoulded articles.
Incomplete statistics according to rotational moulding Professional Committee of Chinese plastic working association, the whole nation consumes resin hundreds of thousands of ton, development rapidly, but in kind LLDPE, because rigidity, the thermotolerance of this resin are not high, the pressure vessels for the chemical industry under civilian container and the normal temperature can only be applied to, the requirement of chemical industry, environmental protection industry (epi) can not be satisfied.
Characteristics such as polypropylene has the rigidity height, and good heat resistance and price are suitable are the first-selected resins of rotational moulding, but domestic no rotational moulding grade polypropylene is produced, if use import rotational moulding grade polypropylene, not only manufacturer is few, and the trade mark is few, cause buying inconvenience, and too expensive, and the user is also beyond affordability.But the regular grade polypropylene has low temperature impact performance difference and easy aged defective, must carry out modification.If adopting and making alloy with regular grade polypropylene and other materials blend is one of preferred plan, in view of present chemical industry, environmental protection industry (epi) develop very fast, increase the rotomoulded articles demand is anxious, do not have at home under other appropriate resin available situations, the method that adopts polypropylene, toughner blend to prepare rotational moulding level material is a preferred plan.Look into newly according to science and technology, domestic also do not have this report.
(3) summary of the invention
The blank for preparing rotational moulding level material aspect in view of present employing polypropylene, toughner blend, the invention provides a kind of is base material with the polypropylene, add auxiliary agents such as toughner, expanding material, linking agent and stablizer, formed the preparation method of polypropylene mixture alloy for rotationally molding through chemical reaction.
The technical scheme that the present invention solves its technical problem is: the preparation method of polypropylene mixture alloy for rotationally molding, this preparation method is as follows: polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer are mixed by proportioning after hopper changes in the response type forcing machine, simultaneously with linking agent and additional crosslinker with dissolution with solvents after charging opening inject in the response type forcing machine, material is at response type forcing machine internal reaction and extrude, granulation; Wherein, polypropylene: toughner: expanding material: thermo-stabilizer: oxidation inhibitor: photostabilizer: linking agent: the weight ratio of additional crosslinker is 100: 10～50: 5～10: 0.1～0.5: 0.1～0.3: 0.3～0.5: 0.5～2.0: 0.5～2.0.
Preferably: described toughner is chlorosulfonated polyethylene; Described expanding material is that percentage of grafting is propylene-maleic anhydride grafts of 85%; Described thermo-stabilizer is orthoboric acid three monooctyl esters; Oxidation inhibitor is 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene; Described photostabilizer is 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel; Described linking agent is a dicumyl peroxide; Described additional crosslinker is a divinylbenzene, and the solvent that dissolves described linking agent and additional crosslinker is stearic acid and acetone, and recommend linking agent: polypropylene: the weight ratio of acetone is 100: 20～40.
Recommend polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer in kneading machine, to mix, the processing parameter of recommending is: mixing time is 6～12 melting index n, the rotating speed of kneading machine is 500～950r/ melting index n, and Heating temperature is 60～70 ℃;
Recommend extruding in twin screw extruder of material to carry out, the processing parameter of recommending is: screw speed is 50～400r/ melting index n, and the temperature of barrel is: opening for feed: 70～80 ℃, and interlude: 90～160 ℃, front end: 170～230 ℃, die head: 210～250 ℃.
Recommend to add simultaneously when just polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer mix stearic acid, the proportioning of recommending is a polypropylene: stearic weight ratio is 100: 0.5～3, and stearic acid can play the effect that promotes Flow of Goods and Materials.
Select for use toughner, expanding material can improve impact-resistance, but, chemical reaction takes place when therefore adopting interpolation linking agent and additional crosslinker to make blend reach the purpose of avoiding rigidity and thermotolerance to reduce with reducing rigidity and thermotolerance.
Because rotation molding is to carry out under the high temperature of long period, therefore polypropylene macromolecular chain easy fracture and reduce performance has added thermo-stabilizer and oxidation inhibitor, and this performance of both having avoided causing because of the moulding environment reduces, and has also improved the resistance to deterioration of goods.
Because polypropylene is easily aging out of doors, therefore adds photostabilizer and improves.
In view of present chemical industry, environmental protection industry (epi) develop very fast, increase the rotomoulded articles demand is anxious, do not have at home under other appropriate resin available situations, adopt blend such as polypropylene, toughner to prepare the method for rotational moulding level material, its popularization, application have great society and economic benefit.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment one
The trade mark that a kind of Qilu Petrochemical company is produced is that 6801 polypropylene takes by weighing 1000g, the toughner chlorosulfonated polyethylene takes by weighing 400g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 75g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 3g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 2g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 3g, stearic acid takes by weighing 10g, and above-mentioned substance is added in the high-speed kneading machine, and the rotating speed of kneading machine is 600r/min, 60 ℃ of temperature, material change the twin screw extruder hopper over to mix 6min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 5g simultaneously, additional crosslinker divinylbenzene (DVP) 5g is dissolved in above-mentioned two kinds of materials in the 300g acetone, is extruding the slowly quantitatively inflow of pusher side material mouth.The rotating speed of twin screw extruder is 200r/min, and barrel temperature is distributed as: opening for feed: 70 ℃, and interlude: 120 ℃, front end: 200 ℃, die head: 220 ℃.The material of extruding through reaction is surveyed melt index through granulated and dried, and it is powder about 40 orders that pellet is worn into granularity, trial product on the rotational moulding trier, observe formability,, survey tensile strength by the respective country standard with qualified goods cutting sample preparation bar, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 8g/10min, tensile yield strength: 28.5Mpa, bending elastic modulus: 1890Mpa, socle girder resistance to impact shock (23 ℃): 505KJ/m 2, hardness: 62R, heat-drawn wire (0.44Mpa): 135 ℃, good moldability during rotational moulding.
Embodiment two
Change the consumption of the toughner of embodiment one into 500g, other embodiments are identical with embodiment one, and its test result is: melting index: 12g/10min, tensile yield strength: 20Mpa, bending elastic modulus: 825Mpa, socle girder resistance to impact shock (23 ℃): 610KJ/m 2, hardness: 55R, heat-drawn wire (0.44Mpa): 115 ℃, good moldability during rotational moulding.
Embodiment three
The trade mark that takes by weighing Qilu Petrochemical company product is 6801 polypropylene 1000g, the toughner chlorosulfonated polyethylene takes by weighing 100g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 100g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 2g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 2g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 5g, stearic acid takes by weighing 15g, and in above-mentioned adding high-speed kneading machine, the rotating speed of kneading machine is 700r/min, 62 ℃ of temperature, material change the twin screw extruder hopper over to mix 10min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 10g simultaneously, additional crosslinker divinylbenzene (DVP) 9g is dissolved in above-mentioned two kinds of materials in the 350g acetone, slowly flows into extruding pusher side material mouth.The rotating speed of twin screw extruder is 300r/min, barrel temperature is distributed as: opening for feed: 80 ℃, interlude: 160 ℃, front end: 170 ℃, die head: 230 ℃, the material of extruding through reaction is surveyed melt index through granulated and dried, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 7g/10minn, tensile yield strength: 32Mpa, bending elastic modulus: 1950Mpa, socle girder resistance to impact shock (23 ℃): 810KJ/m 2, hardness: 45R, heat-drawn wire (0.44Mpa): 105 ℃, good moldability during rotational moulding.
Embodiment four
The trade mark that takes by weighing Qilu Petrochemical company product is 6801 polypropylene 1000g, the toughner chlorosulfonated polyethylene takes by weighing 200g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 50g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 1g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 3g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 3.5g, stearic acid takes by weighing 5g, and above-mentioned substance is added in the high-speed kneading machine, and the rotating speed of kneading machine is 500r/ melting index n, 65 ℃ of temperature, material change the twin screw extruder hopper over to mix 7min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 5g simultaneously, additional crosslinker divinylbenzene (DVP) 5g,, above-mentioned two kinds of materials are dissolved in the 200g acetone, slowly flow into extruding pusher side material mouth.The rotating speed of twin screw extruder is 50r/min, barrel temperature is distributed as: opening for feed: 78 ℃, interlude: 90 ℃, front end: 190 ℃, die head: 210 ℃, the material of extruding through reaction is surveyed melt index through granulated and dried, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 7.5g/10 melting index n, tensile yield strength: 30Mpa, bending elastic modulus: 1850Mpa, socle girder resistance to impact shock (23 ℃): 350KJ/m 2, hardness: 85R, heat-drawn wire (0.44Mpa): 120 ℃, good moldability during rotational moulding.
Embodiment five
The trade mark that takes by weighing Qilu Petrochemical company product is the polypropylene 1000g of EPF30R, the toughner chlorosulfonated polyethylene takes by weighing 500g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 70g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 4g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 2.5g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 3g, stearic acid takes by weighing 20g, and above-mentioned substance is added in the high-speed kneading machine, and the rotating speed of kneading machine is 650r/min, 67 ℃ of temperature, material change the twin screw extruder hopper over to mix 12min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 15g simultaneously, additional crosslinker divinylbenzene (DVP) 14g,, above-mentioned two kinds of materials are dissolved in the 250g acetone, slowly flow into extruding pusher side material mouth.The rotating speed of twin screw extruder is 70r/min, barrel temperature is distributed as: opening for feed: 73 ℃, interlude: 100 ℃, front end: 180 ℃, die head: 215 ℃, the material of extruding through reaction is surveyed melt index through granulated and dried, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 35g/10min, tensile yield strength: 30Mpa, bending elastic modulus: 1300Mpa, socle girder resistance to impact shock (23 ℃): 310KJ/m 2, hardness: 90R, heat-drawn wire (0.44Mpa): 110 ℃, good moldability during rotational moulding.
Embodiment six
The trade mark that takes by weighing Qilu Petrochemical company product is the polypropylene 1000g of EPF30R, the toughner chlorosulfonated polyethylene takes by weighing 300g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 80g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 5g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 1g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 4g, stearic acid takes by weighing 30g, and above-mentioned substance is added in the high-speed kneading machine, and the rotating speed of kneading machine is 950r/min, 66 ℃ of temperature, material change the twin screw extruder hopper over to mix 9min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 20g simultaneously, additional crosslinker divinylbenzene (DVP) 18g is dissolved in above-mentioned two kinds of materials in the 400g acetone, slowly flows into extruding pusher side material mouth.The rotating speed of twin screw extruder is 200r/min, barrel temperature is distributed as: opening for feed: 71 ℃, interlude: 130 ℃, front end: 210 ℃, die head: 240 ℃, the material of extruding through reaction is through granulated and dried, survey melt index, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 30g/10 melting index n, tensile yield strength: 35Mpa, bending elastic modulus: 1400Mpa, socle girder resistance to impact shock (23 ℃): 250KJ/m 2, hardness: 95R, heat-drawn wire (0.44Mpa): 120 ℃, good moldability during rotational moulding.
Embodiment seven
The trade mark that takes by weighing Qilu Petrochemical company product is the polypropylene 1000g of EPF30R, the toughner chlorosulfonated polyethylene takes by weighing 450g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 60g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 3.5g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 1.5g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 4.5g, stearic acid takes by weighing 25g, and above-mentioned substance is added in the high-speed kneading machine, and the rotating speed of kneading machine is 800r/min, 68 ℃ of temperature, material change the twin screw extruder hopper over to mix 11min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 17g simultaneously, additional crosslinker divinylbenzene (DVP) 20g is dissolved in above-mentioned three kinds of materials in the 360g acetone, slowly flows into extruding pusher side material mouth.The rotating speed of twin screw extruder is 100r/min, barrel temperature is distributed as: opening for feed: 75 ℃, interlude: 140 ℃, front end: 230 ℃, die head: 250 ℃, the material of extruding through reaction is through granulated and dried, survey melt index, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 32g/10 melting index n, tensile yield strength: 33Mpa, bending elastic modulus: 1350Mpa, socle girder resistance to impact shock (23 ℃): 280KJ/m 2, hardness: 93R, heat-drawn wire (0.44Mpa): 115 ℃, good moldability during rotational moulding.
Embodiment eight
The trade mark that takes by weighing Qilu Petrochemical company product is the polypropylene 1000g of EPF30R, the toughner chlorosulfonated polyethylene takes by weighing 410g, expanding material propylene-maleic anhydride grafts (percentage of grafting is 85%) takes by weighing 100g, thermo-stabilizer orthoboric acid three monooctyl esters take by weighing 5g, oxidation inhibitor 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene (being antioxidant 330) take by weighing 2g, photostabilizer 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel (being photostabilizer 1084) takes by weighing 4g, stearic acid takes by weighing 15g, and in above-mentioned adding high-speed kneading machine, the rotating speed of kneading machine is 650r/min, 61 ℃ of temperature, material change the twin screw extruder hopper over to mix 8min in kneading machine after.Take by weighing linking agent dicumyl peroxide (DCP) 6g simultaneously, additional crosslinker divinylbenzene (DVP) 6g is dissolved in above-mentioned two kinds of materials in the 320g acetone, slowly flows into extruding pusher side material mouth.The rotating speed of twin screw extruder is 400r/min, barrel temperature is distributed as: opening for feed: 76 ℃, interlude: 150 ℃, front end: 220 ℃, die head: 245 ℃, the material of extruding through reaction is surveyed melt index through granulated and dried, pellet is worn into, granularity is the powder about 40 orders, and trial product on the rotational moulding trier is observed formability, with qualified goods cutting sample preparation bar, survey tensile strength by the respective country standard, bending elastic modulus, shock strength, hardness and heat-drawn wire, its test result is: melting index: 33g/10min, tensile yield strength: 32Mpa, bending elastic modulus: 1330Mpa, socle girder resistance to impact shock (23 ℃): 290KJ/m 2, hardness: 92R, heat-drawn wire (0.44Mpa): 113 ℃, good moldability during rotational moulding.
Comparative Examples
The trade mark that Qilu Petrochemical company is produced is that 6801 polypropylene is worn into the powder about granularity 40 orders, trial product on the rotational moulding trier, observe formability, with qualified goods cutting sample preparation bar, survey tensile strength, bending elastic modulus, shock strength, hardness and heat-drawn wire by the respective country standard, its test result is: melting index: 0.4g/10min, tensile yield strength: 36Mpa, bending elastic modulus: 1670Mpa, socle girder resistance to impact shock (23 ℃): 16.6KJ/m 2, hardness: 93R, heat-drawn wire (0.44Mpa): 96 ℃, can not moulding during rotational moulding.
The trade mark that Qilu Petrochemical company is produced is that the polypropylene of EPF30R is worn into the powder about granularity 40 orders, trial product on the rotational moulding trier, observe formability, with qualified goods cutting sample preparation bar, survey tensile strength, bending elastic modulus, shock strength, hardness and heat-drawn wire by the respective country standard, its test result is: melting index: 14g/10min, tensile yield strength: 25Mpa, bending elastic modulus: 1128Mpa, socle girder resistance to impact shock (23 ℃): 5.4KJ/m 2, hardness: 83R, heat-drawn wire (0.44Mpa): 82 ℃, can not moulding during rotational moulding.
The trade mark that American I CO company is produced is that the PP material of K515 is worn into the powder about granularity 40 orders, trial product on the rotational moulding trier, observe formability, with qualified goods cutting sample preparation bar, survey tensile strength, bending elastic modulus, shock strength, hardness and heat-drawn wire by the respective country standard, its test result is: melting index: 13g/10min, tensile yield strength: 27Mpa, bending elastic modulus: 1200Mpa, socle girder resistance to impact shock (23 ℃): 154KJ/m 2, hardness: 65R, heat-drawn wire (0.44Mpa): 109 ℃, good moldability during rotational moulding.
Rotational moulding level LLDPE is worn into powder about granularity 40 orders, trial product on the rotational moulding trier, observe formability, with qualified goods cutting sample preparation bar, survey tensile strength, bending elastic modulus, shock strength, hardness and heat-drawn wire by the respective country standard, its test result is: melting index: 5g/10min, tensile yield strength: 17.3Mpa, bending elastic modulus: 580Mpa, socle girder resistance to impact shock (23 ℃): 200KJ/m 2, hardness: 40R, heat-drawn wire (0.44Mpa): 70 ℃, good moldability during rotational moulding.
By the test result of embodiment one to embodiment eight and Comparative Examples more as can be known, adopt the polypropylene mixture alloy of the described method preparation of patent, LLDPE compares with the rotational moulding level, its rigidity, hardness and thermotolerance all are improved largely, and K515 compares with import PP material, except that the performance of embodiment two is poor slightly, anti-impact, the heat-drawn wire of other embodiment all improve, and other are approaching, and good moldability.Therefore, the alloy material that makes with this patent can satisfy the requirement of rotation molding and goods use.

Claims (6)

1. the preparation method of polypropylene mixture alloy for rotationally molding, it is characterized in that the preparation method is as follows: polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer are mixed by proportioning after hopper changes in the response type forcing machine, simultaneously with linking agent and additional crosslinker with dissolution with solvents after charging opening inject in the response type forcing machine, material is at response type forcing machine internal reaction and extrude, granulation;
Wherein, polypropylene: toughner: expanding material: thermo-stabilizer: oxidation inhibitor: photostabilizer: linking agent: the weight ratio of additional crosslinker is 100: 10～50: 5～10: 0.1～0.5: 0.1～0.3: 0.3～0.5: 0.5～2.0: 0.5～2.0; Described toughner is chlorosulfonated polyethylene; Described expanding material is that percentage of grafting is propylene-maleic anhydride grafts of 85%; Described thermo-stabilizer is orthoboric acid three monooctyl esters; Oxidation inhibitor is 1,3,5-trimethylammonium-2,4,6-three (3, the 5-di-tert-butyl-4-hydroxyl benzyl) benzene; Described photostabilizer is 2,2-thiobis (4-tert-octyl phenol) n-Butyl Amine 99 nickel; Described linking agent is a dicumyl peroxide; Described additional crosslinker is a divinylbenzene, and the solvent that dissolves described linking agent and additional crosslinker is an acetone.
2. the preparation method of polypropylene mixture alloy for rotationally molding as claimed in claim 1, it is characterized in that: polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer mix 6～12min in kneading machine, the rotating speed of kneading machine is 500～950r/min, and Heating temperature is 60～70 ℃;
Extruding in twin screw extruder of material carried out, and the screw speed of twin screw extruder is 50～400r/min, and the temperature of barrel is: opening for feed: 70～80 ℃, and interlude: 90～160 ℃, front end: 170～230 ℃, die head: 210～250 ℃.
3. the preparation method of polypropylene mixture alloy for rotationally molding as claimed in claim 1, it is characterized in that: polypropylene: the weight ratio of acetone is 100: 20～40.
4. the preparation method of polypropylene mixture alloy for rotationally molding as claimed in claim 1 is characterized in that: add stearic acid when polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor and photostabilizer are mixed simultaneously.
5. the preparation method of polypropylene mixture alloy for rotationally molding as claimed in claim 4, it is characterized in that: polypropylene: stearic weight ratio is 100: 0.5～3.
6. the preparation method of polypropylene mixture alloy for rotationally molding as claimed in claim 5, it is characterized in that: polypropylene, toughner, expanding material, thermo-stabilizer, oxidation inhibitor, photostabilizer and stearic acid mix 6～12min in kneading machine, the rotating speed of kneading machine is 500～950r/min, and Heating temperature is 60～70 ℃;
Extruding in twin screw extruder of material carried out, the solvent that wherein dissolves described linking agent and additional crosslinker is an acetone, polypropylene: the weight ratio of acetone is 100: 20～40, the screw speed of twin screw extruder is 50～400r/min, the temperature of barrel is: opening for feed: 70～80 ℃, interlude: 90～160 ℃, front end: 170～230 ℃, die head: 210～250 ℃.
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US9752024B2 (en) 2013-10-15 2017-09-05 Dow Global Technologies Llc Compatibilized polyolefin blends

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CN103739946A (en) * 2013-12-07 2014-04-23 天津市华鑫达投资有限公司 High-impact high-stiffness polypropylene rotational molding material and preparation method thereof
CN110157099A (en) * 2019-06-12 2019-08-23 金华市捷特包装有限公司 A kind of rotational moulding modified polypropene and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9752024B2 (en) 2013-10-15 2017-09-05 Dow Global Technologies Llc Compatibilized polyolefin blends

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