CN105348767A - Preparing method for modified polycarbonate used for drinking bucket - Google Patents
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- CN105348767A CN105348767A CN201510915432.XA CN201510915432A CN105348767A CN 105348767 A CN105348767 A CN 105348767A CN 201510915432 A CN201510915432 A CN 201510915432A CN 105348767 A CN105348767 A CN 105348767A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
- C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F285/00—Macromolecular compounds obtained by polymerising monomers on to preformed graft polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a preparing method for modified polycarbonate used for a drinking bucket, and belongs to the technical field of high molecular polymers. The preparing method includes the following steps of 1, preparing modification polystyrene; 2, preparing etched carbon fibers; 3, by weight, taking 100-120 parts of polycarbonate, 5-12 parts of the modification polystyrene and the etched carbon fibers, 5-10 parts of PSt-g-MAH, 2-6 parts of coupling agent and 2-7 parts of ethylene-propylene copolymers, placing the materials into a double-screw extruder, carrying out extrusion molding after melt blending, and obtaining the modified polycarbonate. According to the preparing method for the modified polycarbonate, as polystyrene is modified, carbon fibers are etched, and the polycarbonate is modified through the modification polystyrene and the carbon fibers, the mechanical performance of PC is further improved, particularly the abrasion resistance and the scraping resistance of the PC are improved, and the technical problem that a polycarbonate bucket in the prior art is poor in mechanical performance, abrasion resistance and scraping resistance is effectively solved.
Description
Technical field
The invention discloses a kind of preparation method of the modified polycarbonate for scuttlebutt, belong to technical field of high-molecular polymer.
Background technology
Polycarbonate (being called for short PC) is the high molecular polymer containing carbonate group in molecular chain, and the structure according to ester group can be divided into the broad varietys such as aliphatics, aromatic series, aliphatic-aromatic.Mechanical property wherein due to aliphatics and aliphatic-aromatic polycarbonate is lower, thus limits its application in engineering plastics.The suitability for industrialized production at present only having aromatic copolycarbonate to obtain.Due to the singularity on polycarbonate structure, now become the general engineering plastic that in five large-engineering plastics, rate of growth is the fastest.
The features such as polycarbonate has water white transparency, heat-resisting, shock resistance, fire-retardant, all have good mechanical property in common use temperature.At present, three large Application Areass of PC engineering plastics are glazing, automotive industry and electronics, electrical equipment industry, secondly also have office equipment, medical treatment and health care, film, leisure and the protective equipments etc. such as industrial machinery part, CD, packaging, computer.
Wherein, PC prepares scuttlebutt, i.e. bottle blowing grade polycarbonate, is the another important application of polycarbonate.PC bucket is transparent, lightweight, impact-resistance is good, and resistance to certain high temperature and etchant solution washing, use as recoverable container.From 1999 so far, China puts into effect the quality standard of multi-section Regular application bucket, therein defining the use material of scuttlebutt, i.e. PC bucket.
Although PC bucket possesses above-mentioned excellent performance and good prospect of the application, PC bucket still exposes some defects in actual use.Because PC bucket is recycled, in use, repeatedly recycle and can cause damage to PC bucket, there is scratch and the feature such as thinning, the continuation affecting PC bucket uses, and the reusable number of times of current PC bucket is about 60 ~ 90 times, is no more than at most 100 times, being polycarbonate problem of aging on the one hand, is exactly the deficiency of the scratch resistant performance of PC bucket and wear resisting property on the other hand.
The patent documentation that CN101864157A discloses " a kind of preparation method of the polycarbonate for blowing ", wherein specifically disclose a kind of polycarbonate for the preparation of scuttlebutt, the component of its raw material and the mass percent of each component are: polycarbonate 98% ~ 100%, chainextender 0.1 ~ 0.5%, oxidation inhibitor 0.1% ~ 1.0%, toner 0.01% ~ 0.5%, UV light absorber 0.01% ~ 0.5%, preparation method adopts single screw extrusion machine.As can be seen here, this scuttlebutt polycarbonate used is on the basis of existing polycarbonate, add some functional agent and toners, and for finely tuning its performance and color, the change that performance is large, the performance deficiency for polycarbonate itself does not improve.
Summary of the invention
The object of the invention is to solve defect on scratch resistant, wear resisting property of scuttlebutt polycarbonate and deficiency, mainly preparing modified polycarbonate by carrying out modification to polycarbonate.
Technical scheme:
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, by weight, get polystyrene 8 ~ 12 parts, polypropylene 2.5 ~ 4.5 parts, Propenoic acid, 2-methyl, isobutyl ester 1.5 ~ 2.5 parts, nano-titanium oxide 0.2 ~ 0.8 part, initiator 1.2 ~ 1.8 parts and solubilizing agent 3 ~ 6 parts and put into reactor, react at 50 ~ 75 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, by weight, get polycarbonate 100 ~ 120 parts, modified polystyrene, 5 ~ 12 parts, etching carbon fiber, PSt-g-MAH5 ~ 10 part, coupling agent 2 ~ 6 parts and ethylene-propylene copolymer 2 ~ 7 parts, put into twin screw extruder, extrusion moulding after melt blending;
Wherein, in twin screw extruder, forcing machine Heating temperature is 280 ~ 305 DEG C.
In described 1st step, initiator is peroxide initiator.
More preferably, in described 1st step, initiator is one or more of di-t-butyl peroxide, dicumyl peroxide, isopropyl benzene hydroperoxide and peroxidized t-butyl perbenzoate.
In described 1st step, solubilizing agent is maleic anhydride inoculated polypropylene.
In described 3rd step, coupling agent model is KH540 silane coupling agent or the silane coupled dosage of KH792.
In described 3rd step, the model of ethylene-propylene copolymer is T612 or T613.
beneficial effect
The preparation method of modified polycarbonate provided by the invention, utilize polyolefine and carbon fiber to carry out modification to polycarbonate, for reaching more preferably effect, first be that p-poly-phenyl ethene carries out modification and etches carbon fiber, to improve poly performance and the processing characteristics improving carbon fiber, through modified polystyrene and carbon fiber to the modification of polycarbonate, the mechanical property of the modified polycarbonate obtained improves further, especially its wear resisting property and scratch resistant performance, reach a more preferably level, efficiently solve the technical problem that polycarbonate bucket in prior art is not enough in performance in this respect.And the polycarbonate after modification also gets a promotion in weathering resistance, the scuttlebutt prepared thus its reuse number of times and work-ing life is all improved.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The maleic anhydride inoculated polypropylene model that the present invention adopts is SWJ-1B2, is produced, percentage of grafting 0.6 ~ 0.8MA% by Saudi Aribian Basic Industry Company (Sabic).
The carbon fiber that the present invention adopts is T300 level model carbon fiber, and toray company produces.
The polycarbonate specification that the present invention adopts is 2605, and Bayer A.G produces.
The PSt-g-MAH model that the present invention adopts is SMA2021, and French Cray Valleylad Inc. produces.
The twin screw extruder model that the present invention adopts is SAT-95, and Nanjing Yue Sheng extrusion equipment company limited produces.
Embodiment 1
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, get polystyrene 0.8Kg, polypropylene 0.25Kg, Propenoic acid, 2-methyl, isobutyl ester 0.15Kg, nano-titanium oxide 0.02Kg, isopropyl benzene hydroperoxide 0.12Kg and maleic anhydride inoculated polypropylene 0.3Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, get polycarbonate 10.5Kg part, modified polystyrene 1.39Kg, etching carbon fiber 0.7Kg part, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Embodiment 2
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, get polystyrene 1.2Kg, polypropylene 0.45Kg, Propenoic acid, 2-methyl, isobutyl ester 0.25Kg, nano-titanium oxide 0.08Kg, isopropyl benzene hydroperoxide 0.18Kg and maleic anhydride inoculated polypropylene 0.6Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, get polycarbonate 10.7Kg part, modified polystyrene 2.76Kg, etching carbon fiber 0.7Kg part, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Embodiment 3
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, get polystyrene 1Kg, polypropylene 0.38Kg, Propenoic acid, 2-methyl, isobutyl ester 0.22Kg, nano-titanium oxide 0.05Kg, peroxidized t-butyl perbenzoate 0.14Kg and maleic anhydride inoculated polypropylene 0.5Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, get polycarbonate 10Kg, modified polystyrene 2.29Kg, etching carbon fiber 0.5Kg, PSt-g-MAH0.5Kg, KH792 silane coupling agent 0.2Kg and T613 ethylene-propylene copolymer 0.2Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Embodiment 4
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, get polystyrene 1Kg, polypropylene 0.35Kg, Propenoic acid, 2-methyl, isobutyl ester 0.22Kg, nano-titanium oxide 0.05Kg, peroxidized t-butyl perbenzoate 0.14Kg and maleic anhydride inoculated polypropylene 0.5Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, get polycarbonate 12Kg, modified polystyrene 2.26Kg, etching carbon fiber 1.2Kg, PSt-g-MAH1Kg, KH792 silane coupling agent 0.6Kg and T613 ethylene-propylene copolymer 0.7Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Embodiment 5
For a preparation method for the modified polycarbonate of scuttlebutt, comprise the steps:
1st step, get polystyrene 1Kg, polypropylene 0.38Kg, Propenoic acid, 2-methyl, isobutyl ester 0.22Kg, nano-titanium oxide 0.05Kg, peroxidized t-butyl perbenzoate 0.14Kg and maleic anhydride inoculated polypropylene 0.5Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, get polycarbonate 10.7Kg part, modified polystyrene 2.29Kg, etching carbon fiber 0.7Kg part, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Reference examples 1
Be with the difference of embodiment 5: polystyrene is unmodified, directly join in the 3rd step.
1st step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
2nd step, get polycarbonate 10.7Kg part, polystyrene 2.29Kg, etching carbon fiber 0.7Kg part, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Reference examples 2
Be with the difference of embodiment 5: do not add modified carbon fiber.
1st step, get polystyrene 1Kg, polypropylene 0.38Kg, Propenoic acid, 2-methyl, isobutyl ester 0.22Kg, nano-titanium oxide 0.05Kg, peroxidized t-butyl perbenzoate 0.14Kg and maleic anhydride inoculated polypropylene 0.5Kg and put into reactor, react at 65 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, get polycarbonate 10.7Kg part, modified polystyrene 2.29Kg, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Reference examples 3
Be with the difference of embodiment 5: do not add modified polystyrene and modified carbon fiber.
1st step, get polycarbonate 10.7Kg part, PSt-g-MAH0.6Kg, KH540 silane coupling agent 0.4Kg and T612 ethylene-propylene copolymer 0.3Kg, put into twin screw extruder, extrusion moulding after melt blending, the thick PC plate of preparation 1mm;
In whole moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C, molding cycle time 25s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
Reference examples 4
The blow molding of direct use polycarbonate.In whole blow-moulding process: forcing machine Heating temperature is 290 DEG C, head temperature 280 DEG C, machine head port mould temperature 280 DEG C; Temperature 80 DEG C at the bottom of scuttlebutt mould bottle, bottle 80 DEG C, bottleneck 68 DEG C; Preform blowup pressure 0.9MPa, gassing time 32s, molding cycle time 65s, post-processing temperature 135 DEG C, time 30min, finally cools, traction, cutting.
PC plate above-described embodiment and reference examples prepared, carries out performance test:
First, detect the fundamental property index of each PC sheet material, result is as shown in table 1:
Table 1 embodiment 1 ~ 5 and reference examples 1 ~ 4PC plate fundamental property data
As seen from the above table, embodiment 1 ~ 5 and reference examples 1 ~ 4, on flame retardant rating and corrosion resistant performance index, do not have difference; In heat-drawn wire index, by adding modified polystyrene and carbon fiber, the heat-drawn wire of embodiment 1 ~ 5 has larger improvement; In specific inductivity index, due to adding of carbon fiber, electrical property has and slightly declines.
Carry out mechanical test according to ASTMD associated test standards to the PC sheet material that embodiment 1 ~ 5 and reference examples 1 ~ 4 obtain, result is as shown in table 2:
Table 2 embodiment 1 ~ 5 and reference examples 1 ~ 4PC plate data of mechanical
As seen from the above table, through the polycarbonate of modified polystyrene and carbon fiber modifying, above-mentioned mechanical index obtains larger lifting, and especially in tensile strength, flexural strength and fatigue strength index, performance is very excellent.
Amsler vibraphone machine is tested the wear resisting property of PC plate, rotating speed: 185r/min, hardness: 58-60HRC, surface roughness Ra=0.4um, to time consuming 2h, load 30Kg, result is as shown in table 3:
Table 3 embodiment 1 ~ 5 and reference examples 1 ~ 4PC plate wear resisting property test data
As seen from the above table, reference examples 1 and reference examples 2 do not add modified polystyrene and carbon fiber respectively, its wear resisting property and scratch resistant performance reduce, reference examples 3 does not add modified polystyrene and carbon fiber simultaneously, and performance reduces further, the PC plate only prepared with polycarbonate, poor in wear-resisting and scratch resistant performance, therefore, add modified polystyrene and carbon fiber simultaneously, effectively can solve the problem of scuttlebutt wear resistance and scratch resistant poor-performing.
Claims (6)
1. for a preparation method for the modified polycarbonate of scuttlebutt, it is characterized in that, comprise the steps:
1st step, by weight, get polystyrene 8 ~ 12 parts, polypropylene 2.5 ~ 4.5 parts, Propenoic acid, 2-methyl, isobutyl ester 1.5 ~ 2.5 parts, nano-titanium oxide 0.2 ~ 0.8 part, initiator 1.2 ~ 1.8 parts and solubilizing agent 3 ~ 6 parts and put into reactor, react at 50 ~ 75 DEG C, after reaction terminates, obtain modified polystyrene;
2nd step, by mass concentration be 60% nitric acid treatment carbon fiber, process 1h under room temperature, dry through washing, obtain etching carbon fiber;
3rd step, by weight, get polycarbonate 100 ~ 120 parts, modified polystyrene, 5 ~ 12 parts, etching carbon fiber, PSt-g-MAH5 ~ 10 part, coupling agent 2 ~ 6 parts and ethylene-propylene copolymer 2 ~ 7 parts, put into twin screw extruder, extrusion moulding after melt blending;
Wherein, in twin screw extruder, forcing machine Heating temperature is 280 ~ 305 DEG C.
2. the preparation method of the modified polycarbonate for scuttlebutt according to claim 1, is characterized in that: in described 1st step, initiator is peroxide initiator.
3. the preparation method of the modified polycarbonate for scuttlebutt according to claim 2, it is characterized in that: in described 1st step, initiator is one or more of di-t-butyl peroxide, dicumyl peroxide, isopropyl benzene hydroperoxide and peroxidized t-butyl perbenzoate.
4. the preparation method of the modified polycarbonate for scuttlebutt according to claim 1, is characterized in that: in described 1st step, solubilizing agent is maleic anhydride inoculated polypropylene.
5. the preparation method of the modified polycarbonate for scuttlebutt according to claim 1, is characterized in that: in described 3rd step, and coupling agent model is KH540 silane coupling agent or the silane coupled dosage of KH792.
6. the preparation method of the modified polycarbonate for scuttlebutt according to claim 1, is characterized in that: in described 3rd step, and the model of ethylene-propylene copolymer is T612 or T613.
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