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A kind of preparation method of high toughness PET

A high-toughness, high-speed mixer technology, applied in the field of polymer materials, can solve the problems of increased material cost, complicated processing process, and cost rise, and achieve the effects of low cost, increased commercial value, and improved toughness

Active Publication Date: 2018-10-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some work adopts the method of alloying such as PET / PC alloy, the cost of adopting this kind of method material can rise substantially and can cause the processing process to complicate and provide a kind of preparation method of supertough PET / PBT / PC alloy in CN102061076A, PC The introduction improves the toughness of the alloy, but greatly increases the cost of the material

Method used

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  • A kind of preparation method of high toughness PET
  • A kind of preparation method of high toughness PET

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of branched polystyrene by emulsion polymerization: the molar ratio of styrene, α-methacrylate-3-mercaptohexyl and potassium persulfate is 100:2:1, styrene, water, dodecylbenzenesulfonate The mass ratio of sodium bicarbonate to sodium bicarbonate is 100:200:5:3, the polymerization reaction temperature is 80°C, react for 8 hours, add saturated saline to break the emulsion, wash the obtained polymer with water, and finally dry it to measure BPS1:M w.MALLS =457600 g / mol, g'=0.75.

[0026] The branched polystyrene (BPS1:M prepared by emulsion polymerization w.MALLS =457600g / mol, g'=0.75) and PET (m BPS1 :m PET=0.5%), through the SHJ-20 twin-screw extruder melt extrusion, extrusion temperature: 220 ° C, 230 ° C, 235 ° C, 240 ° C, 245 ° C, head temperature 250 ° C, host speed 180r / min, Feed at a speed of 150r / min, water-cooled, cut and granulate to obtain PET pellets, and place the obtained pellets in a blast drying oven at 120°C for at least 24 hours to fully ...

Embodiment 2

[0028] The steps for preparing branched polystyrene by emulsion polymerization are the same as in Example 1.

[0029] The branched polystyrene (BPS1:M prepared by emulsion polymerization w.MALLS =457600g / mol, g'=0.75) and PET (m BPS1 :m PET =1.0%), melted and extruded through SHJ-20 twin-screw extruder, extrusion temperature: 220°C, 230°C, 235°C, 240°C, 245°C, head temperature 250°C, host speed 160r / min, The feeding speed is 120r / min, water-cooled cutting and granulation to obtain PET pellets, and the obtained pellets are dried in a blast drying oven at 120°C for at least 24 hours to fully evaporate the water to prevent polyester degradation caused by high temperature water. Get a part of the pellets and measure the melt flow rate constant (MFR) on the melt flow rate constant measuring instrument to be 12.37g / 10min, and another part of the pellets is injected into a spline according to the national standard (GB1042-92) on the injection molding machine. Carry out mechanical ...

Embodiment 3

[0031] Preparation of branched polystyrene by emulsion polymerization: the molar ratio of styrene, α-methacrylate-3-mercaptohexyl and potassium persulfate is 100:1.5:1, styrene, water, dodecylbenzenesulfonate The mass ratio of sodium bicarbonate to sodium bicarbonate is 100:200:5:3, the polymerization reaction temperature is 80°C, react for 8 hours, add saturated saline to break the emulsion, wash the obtained polymer with water, and finally dry it to measure BPS2:M w.MALLS =734600 g / mol, g'=0.71.

[0032] The branched polystyrene (BPS2:M that emulsion polymerization prepares w.MALLS =734600g / mol, g'=0.71) and PET (m BPS2 :m PET =1.0%), melted and extruded through SHJ-20 twin-screw extruder, extrusion temperature: 220°C, 230°C, 235°C, 240°C, 245°C, head temperature 250°C, host speed 180r / min, The feeding speed is 120r / min, water-cooled cutting and granulation to obtain PET pellets, and the obtained pellets are dried in a blast drying oven at 120°C for at least 24 hours to f...

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Abstract

The invention discloses a method for preparing high-toughness PET (Polyethylene Terephthalate). According to the method, a PET / BPS blend is prepared through adding a proper amount of branched polystyrene (BPS) into a PET base body and carrying out melt blending, wherein the use level of BPS is 0.5-2.0% the weight of PET. Compared with pure PET, the PET / BPS blend has the advantages that the impact strength is improved by 10-20%, the elongation at break reaches 50-400%, and the toughness is improved greatly. According to the method, the high-toughness PET with good processability is prepared through carrying out melt blending on branched BPS with high molecular weight and high degree of branching and PET, the preparation method is easy and feasible, the application of the PET in production is enlarged, and thus the commercial application value of the PET is more outstanding.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method for improving the impact resistance and processing performance of PET. Background technique [0002] Polyethylene terephthalate (PET) is the first linear polymer to be industrialized by DuPont in 1953. The high symmetry of its molecular chain structure and the rigidity of the phenyl bond make it have good mechanical processing performance, chemical corrosion resistance, electrical insulation, safety and anti-microbial erosion performance, etc., and because the price is relatively low and easy With the advantages of recycling, it is widely used in various fields such as films, fibers, and plastic products. The disadvantages are that PET molding is difficult, the molding temperature is high, the production cycle is long, the toughness is poor, the impact strength is low, and the material is brittle, which limits its wider application. In order to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L25/08C08L91/06C08F212/08C08F220/38C08F2/26
CPCC08F2/26C08F212/08C08L67/02C08L2205/03C08L25/08C08L91/06C08F220/38
Inventor 蒋必彪孟迪黄文艳薛小强杨宏军
Owner CHANGZHOU UNIV
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