CN104325622A - Modified fluorinated ethylene propylene and preparation method thereof - Google Patents
Modified fluorinated ethylene propylene and preparation method thereof Download PDFInfo
- Publication number
- CN104325622A CN104325622A CN201410436679.9A CN201410436679A CN104325622A CN 104325622 A CN104325622 A CN 104325622A CN 201410436679 A CN201410436679 A CN 201410436679A CN 104325622 A CN104325622 A CN 104325622A
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- temperature
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- propylene
- preparation
- perfluoroethylene
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
-
- 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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
-
- 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
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/64—Screws with two or more threads
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—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
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
Abstract
The invention discloses a preparation method of modified fluorinated ethylene propylene. The preparation method comprises the following steps: (1) feeding at least two fluorinated ethylene propylene with different flowing speeds into a mixing facility, and mixing for 25 to 35 minutes at a temperature of 105 to 115 DEG C; (2) feeding the mixture obtained in the step (1) into a melting extruder, and carrying out extruding and granulating so as to obtain the modified fluorinated ethylene propylene. In the preparation method, FEPs with different flowing speeds are mixed, and then the mixture is subjected to melting extrusion with specifically-controlled technology parameters so as to obtain the modified fluorinated ethylene propylene, which has a stable flowing speed, wherein the deviation of the flowing speed is not greater than 1 g/10 minutes.
Description
Technical field
The present invention relates to technical field of polymer materials, particularly relate to a kind of modification perfluoroethylene-propylene and preparation method thereof.
Background technology
Current fluoroplastics FEP (perfluoroethylene-propylene) is one of important kind of fluoropolymer, adopts still reaction copolyreaction to produce by TFE (tetrafluoroethene) and HFP (hexafluoropropene).Because the impact of the temperature in the feature of polymerisation and course of reaction and pressure causes hexafluoro molecule content in finished product FEP unstable, and then make FEP finished product middle-molecular-weihydroxyethyl uneven.And the FEP finished product flowing velocity instability (product flowing velocity is generally at about 2-30g/10 minute) that molecular weight is uneven, and flowing velocity instability when can cause melting in following process viscosity inconsistent, when causing FEP following process goods, in unit interval, do not flow through the FEP resin volume after the melting of process equipment cavity not etc., also cause process equipment cavity internal pressure unstable, when causing the product of following process in injection moulding or extrude, pressure is uneven, and shear stress is unstable.Cause the accessory size of following process unstable, yielding, or it is unstable to be used as electric wire insulation layer intensity, wire external diameter fluctuation is large, uneven when causing electric wire heat shrinkable, the defects such as insulating barrier is easy to crack.
Summary of the invention
Based on this, the invention provides a kind of preparation method of modification perfluoroethylene-propylene, the flowing velocity temperature of the perfluoroethylene-propylene that this preparation method prepares, deviation is no more than 1g/10 minute.
Concrete technical scheme is as follows:
A preparation method for modification perfluoroethylene-propylene, comprises the steps:
(1) perfluoroethylene-propylene of at least two kinds of different flowing speed specifications is placed in mixing facilities, in 105-115 DEG C of mixing 25-35min;
(2) mixture after mixing for step (1) is placed in melt extruder, namely extruding pelletization obtains described modification perfluoroethylene-propylene;
Wherein, the technological parameter of described melt extruder is: screw compression is than being 3.4-3.6:1; One district's temperature 298 ~ 302 DEG C, two district's temperature 303 ~ 307 DEG C, three district's temperature 308 ~ 312 DEG C, four district's temperature 313 ~ 317 DEG C, five district's temperature 318 ~ 322 DEG C, six district's temperature 318 ~ 322 DEG C.
Wherein in an embodiment, described screw compression is than being 3.5:1.
Wherein in an embodiment, the technological parameter of described melt extruder also comprises: screw speed is 55-65RPM.
Wherein in an embodiment, the technological parameter of described melt extruder is: screw compression is than being 3.5:1; One district's temperature 300 DEG C, two district's temperature 305 DEG C, three district's temperature 310 DEG C, four district's temperature 315 DEG C, five district's temperature 320 DEG C, six district's temperature 320 DEG C; Screw speed is 60RPM.
Wherein in an embodiment, the difference flowing speed specification scope of described perfluoroethylene-propylene is 5-30g/10 minute.
Principle of the present invention and advantage as follows:
Current fluoroplastics FEP (perfluoroethylene-propylene) is by the product obtaining different flowing speed specification (2-30g/10 minute) after polymerization manufacturer production, even if but the product of a certain fixing specification (such as flowing velocity specification is 19g/10 minute), flowing velocity in its actual use procedure is still unstable, and deviation even reaches 3-5g/10 minute.The performance of the product of this situation extreme influence following process, difference the flowed FEP of speed specification of the present invention carries out mixing, then melt extruding through special process state modulator, the modification perfluoroethylene-propylene obtained, its flowing velocity is stablized, and deviation is no more than 1g/10 minute.
Wherein special process parameter comprises: (1) controls screw compression than for 3.5:1, and namely screw rod is the most shallow to anterior 2/3 two depths of thread by rear portion is 3.5:1 with bosom ratio, and the length depth of thread of following 1/3 is 2:1.At present, in market product production, screw compression ratio controls at 3:1 usually, and screw rod is shoaled to front portion is asymptotic by rear portion; And screw compression ratio controls at 3.5:1 by the present invention, through Experimental comparison, adopt the conventional compression screw rod melting of 3:1, enter material in screw rod cannot every be all fully heated, cannot fully melting under screw rod heating is rotated, cause final products strength difference larger; Use the compression ratio of 3.5:1, the most shallow design of screw rod 3/2 place's screw thread; Material constantly absorbs heat at depths, rear portion screw thread, at screw rod 2/3 because screw thread is shallow, because between screw rod and spiral shell cylinder, gap is minimum, material is under pressure and arrives peak, and now material continues to run forward under bolt rotary, arrives 2:1 depth of thread region, material after heating and melting in this region because screw thread deepens, pressure reduces thereupon, and material internal temperature rises, and accelerates melting and mixing degree; (2) temperature controlling 6th district is: district's temperature 298 ~ 302 DEG C, two district's temperature 303 ~ 307 DEG C, three district's temperature 308 ~ 312 DEG C, four district's temperature 313 ~ 317 DEG C, five district's temperature 318 ~ 322 DEG C, six district's temperature 318 ~ 322 DEG C.
Detailed description of the invention
Below by way of specific embodiment, the application is further elaborated.
Embodiment 1
The preparation method of a kind of modification perfluoroethylene-propylene of the present embodiment, comprises the steps:
(1) flowing velocity specification is respectively 23g/10 minute, 21g/10 minute, 19g/10 minute, 16g/10 minute perfluoroethylene-propylene be placed in mixing facilities by the mass ratio of 6:2:1:1, in 110 DEG C of mixing 30min;
(2) mixture after mixing for step (1) is placed in melt extruder, namely extruding pelletization obtains described modification perfluoroethylene-propylene;
Wherein, the technological parameter of described melt extruder is: screw compression is than being 3.5:1; One district's temperature 300 DEG C, two district's temperature 305 DEG C, three district's temperature 310 DEG C, four district's temperature 315 DEG C, five district's temperature 320 DEG C, six district's temperature 320 DEG C; Screw speed is 60RPM.
The flowing velocity of the modification perfluoroethylene-propylene that the present embodiment prepares is 19.6g/10 minute.
Gradation sampling adopts ASTMD1238 to test flowing velocity and is respectively 19.3,19.5,19.6,19.2,19.4; ASTMD638 test tensile strength is adopted to be respectively 19.2MpA, 20MPA, 19.6MPA, 19MPA, 20.2MPA.
Embodiment 2
The preparation method of a kind of modification perfluoroethylene-propylene of the present embodiment, comprises the steps:
(1) flowing velocity specification is respectively 4.6g/10 minute, 6.2g/10 minute, 7.5g/10 minute, 12g/10 minute perfluoroethylene-propylene be placed in mixing facilities by the mass ratio of 2:2:3:3, in 110 DEG C of mixing 30min;
(2) mixture after mixing for step (1) is placed in melt extruder, namely extruding pelletization obtains described modification perfluoroethylene-propylene;
Wherein, the technological parameter of described melt extruder is: screw compression is than being 3.4:1; One district's temperature 302 DEG C, two district's temperature 303 DEG C, three district's temperature 312 DEG C, four district's temperature 313 DEG C, five district's temperature 318 DEG C, six district's temperature 322 DEG C; Screw speed is 55RPM.
The flowing velocity of the modification perfluoroethylene-propylene that the present embodiment prepares is 10g/10 minute.
Gradation sampling adopts ASTMD1238 to test flowing velocity and is respectively:
9.8g/10 minute, 9.7g/10 minute, 10.2g/10 minute, 9.9g/10 minute, 10.1g/10 minute; ASTMD638 test tensile strength is adopted to be respectively 20.2MPA, 20.5MPA, 19.8MPA, 20MPA, 19.8MPA.
Embodiment 3
The preparation method of a kind of modification perfluoroethylene-propylene of the present embodiment, comprises the steps:
(1) flowing velocity specification is respectively 10.3g/10 minute, 14g/10 minute, 18g/10 minute, 16g/10 minute perfluoroethylene-propylene be placed in mixing facilities by the mass ratio of 2:2:2:4, in 110 DEG C of mixing 30min;
(2) mixture after mixing for step (1) is placed in melt extruder, namely extruding pelletization obtains described modification perfluoroethylene-propylene;
Wherein, the technological parameter of described melt extruder is: screw compression is than being 3.6:1; One district's temperature 298 DEG C, two district's temperature 307 DEG C, three district's temperature 308 DEG C, four district's temperature 317 DEG C, five district's temperature 322 DEG C, six district's temperature 318 DEG C; Screw speed is 65RPM.
The flowing velocity of the modification perfluoroethylene-propylene that the present embodiment prepares is 15g/10 minute.
Gradation sampling adopts ASTMD1238 to test flowing velocity and is respectively:
14.8g/10 minute, 15.1g/10 minute, 15g/10 minute, 14.5g/10 minute, 15.2g/10 minute; ASTMD638 test tensile strength is adopted to be respectively: 19.2MPA, 19.8MPA, 19.8MPA, 20MPA, 19.5MPA.
Comparative example 1
A kind of modification perfluoroethylene-propylene of this comparative example, its preparation method is identical with embodiment 1, and only screw compression is than different, and the screw compression of this comparative example is than being 3:1.
Gradation sampling adopts ASTMD1238 to test flowing velocity and is respectively:
18.3,19.8,21,20.5,18.4; ASTMD638 test tensile strength is adopted to be respectively 19.5MpA, 17.8MPA, 18.2MPA, 17.6MPA, 18MPA.
Embodiment 4 performance test
Modification perfluoroethylene-propylene embodiment 1-3 and comparative example 1 prepared carries out application experiment (injection-moulded plastic part) with perfluoroethylene-propylene before modified, each extraction 3 kilograms sample, and random 5 sample testings from each routine sample, result is as shown in the table:
Each embodiment and before modified test all samples fusing point are all at 265 ± 5 DEG C; Percentage elongation 300% to 400%, between proportion 2.14-2.17; Each example and before modified no significant difference;
But the product flowing speed stability deviation after this modified technique is the highest at 0.7g/10 minute, and product differentiation was at about 3.2g/10 minute before modified, flowing velocity stability is apparently higher than product before modified; Hot strength difference, the highest deviation 1.2mpa of each embodiment, difference 2.3Mpa before modified, hot strength stability embodiment is higher than product before modified.
Product injection moulding diameter was 10CM annulus part for 10g/10 minute to use modified flowing velocity, and injecting products differs about 0.1% with cavity dimension, and use the same explained hereafter of product before modified, shrinkage factor fluctuates at about 0.3%-0.5%; Use 19.6g/10 minute and produce diameter 1.2mm electric wire, modified product external diameter fluctuation about 0.01mm; And before modified production time product external diameter fluctuate at about 0.05mm; Dimension stability modified during formed product is apparently higher than product before modified.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (5)
1. a preparation method for modification perfluoroethylene-propylene, is characterized in that, comprises the steps:
(1) perfluoroethylene-propylene of at least two kinds of different flowing speed specifications is placed in mixing facilities, in 105-115 DEG C of mixing 25-35min;
(2) mixture after mixing for step (1) is placed in melt extruder, namely extruding pelletization obtains described modification perfluoroethylene-propylene;
Wherein, the technological parameter of described melt extruder is: screw compression is than being 3.4-3.6:1; One district's temperature 298 ~ 302 DEG C, two district's temperature 303 ~ 307 DEG C, three district's temperature 308 ~ 312 DEG C, four district's temperature 313 ~ 317 DEG C, five district's temperature 318 ~ 322 DEG C, six district's temperature 318 ~ 322 DEG C.
2. the preparation method of modification perfluoroethylene-propylene according to claim 1, is characterized in that, described screw compression is than being 3.5:1.
3. the preparation method of modification perfluoroethylene-propylene according to claim 1, is characterized in that, the technological parameter of described melt extruder also comprises: screw speed is 55-65rpm.
4. the preparation method of the modification perfluoroethylene-propylene according to any one of claim 1-3, is characterized in that, the technological parameter of described melt extruder is: screw compression is than being 3.5:1; One district's temperature 300 DEG C, two district's temperature 305 DEG C, three district's temperature 310 DEG C, four district's temperature 315 DEG C, five district's temperature 320 DEG C, six district's temperature 320 DEG C; Screw speed is 60rpm.
5. the preparation method of modification perfluoroethylene-propylene according to claim 1, is characterized in that, the flowing velocity specification limit of described perfluoroethylene-propylene is 2-30g/10 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410436679.9A CN104325622A (en) | 2014-08-29 | 2014-08-29 | Modified fluorinated ethylene propylene and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410436679.9A CN104325622A (en) | 2014-08-29 | 2014-08-29 | Modified fluorinated ethylene propylene and preparation method thereof |
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| CN104325622A true CN104325622A (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410436679.9A Pending CN104325622A (en) | 2014-08-29 | 2014-08-29 | Modified fluorinated ethylene propylene and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688515A (en) * | 2016-03-23 | 2016-06-22 | 钟校 | Preparation method of fluorinated ethylene propylene filter screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664795A (en) * | 1968-07-02 | 1972-05-23 | Barmag Barmer Maschf | Screw extruders with dual section ejection zone |
| US4107260A (en) * | 1975-03-12 | 1978-08-15 | Western Electric Company, Inc. | Methods of working expandable thermoplastic materials in an extruder |
| US4552925A (en) * | 1982-03-08 | 1985-11-12 | Daikin Kogyo Co., Ltd. | Tetrafluoroethylene/hexafluoropropylene copolymer having improved extrudability |
| CN103665681A (en) * | 2013-09-11 | 2014-03-26 | 东台市天龙塑料制品厂 | Novel plastic pipe and production method for same |
-
2014
- 2014-08-29 CN CN201410436679.9A patent/CN104325622A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3664795A (en) * | 1968-07-02 | 1972-05-23 | Barmag Barmer Maschf | Screw extruders with dual section ejection zone |
| US4107260A (en) * | 1975-03-12 | 1978-08-15 | Western Electric Company, Inc. | Methods of working expandable thermoplastic materials in an extruder |
| US4552925A (en) * | 1982-03-08 | 1985-11-12 | Daikin Kogyo Co., Ltd. | Tetrafluoroethylene/hexafluoropropylene copolymer having improved extrudability |
| CN103665681A (en) * | 2013-09-11 | 2014-03-26 | 东台市天龙塑料制品厂 | Novel plastic pipe and production method for same |
Non-Patent Citations (5)
| Title |
|---|
| 刘亚青: "《工程塑料成型加工技术》", 31 May 2006 * |
| 王霞，华幼卿，乔辉，吴立峰: "可溶性聚全氟乙丙烯色母粒的研制", 《塑料》 * |
| 翁其金: "《塑料模塑成型技术第2版》", 30 June 2011 * |
| 钱知勉，包永忠: "《氟塑料加工与应用》", 31 July 2010 * |
| 钱知勉: "《塑料性能应用手册（修订版）》", 31 March 1987 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105688515A (en) * | 2016-03-23 | 2016-06-22 | 钟校 | Preparation method of fluorinated ethylene propylene filter screen |
| CN105688515B (en) * | 2016-03-23 | 2018-05-04 | 钟校 | A kind of preparation method of perfluoroethylene-propylene strainer |
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Application publication date: 20150204 |