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Low-melting point and high-crystallization temperature PET copolyester, its preparation method and application

A high-crystal, copolyester technology, applied in the field of PET copolyester, can solve the problems of high cost of polymer nucleating agent crustacean liquid crystal, inconsistency with actual production, affecting PET performance, etc., to improve processing and forming performance, good bending Modulus, effect of reducing production cost

Inactive Publication Date: 2013-05-15
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Increasing the crystallization temperature of PET is mainly achieved by adding additives and using physical blending methods. For example, Chinese patent 200610116598.6 discloses a polyethylene terephthalate composite material and its preparation method, using PET and polymer nucleating agents, The crystallization accelerator and other additives are put into the twin-screw extruder after high-speed stirring and mixing, and after plasticization and melting, the finished product is obtained by extrusion, drawing, cooling, pelletizing, and drying. The crystallization rate of ethylene glycol ester is easy to produce, but the polymer nucleating agent is introduced into the polyester material through the blending method, whether it can be uniformly dispersed in the resin matrix, and whether it will migrate during processing and use , reunion, will affect the performance of PET
In addition, the polymer nucleating agent carapace liquid crystal has a high cost and is sensitive to temperature, which is not suitable for actual production.

Method used

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  • Low-melting point and high-crystallization temperature PET copolyester, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 3.74kg of terephthalic acid, 0.42kg of isophthalic acid, and 2.02kg of ethylene glycol into the esterification kettle, and carry out the esterification reaction at 0.2~0.4MPa and 260°C; when the amount of water distilled from the esterification reaches After the target value, it is transferred to the polycondensation kettle, and the catalyst is added with 0.5g antimony trioxide, 0.24g tetrabutyl titanate, stabilizer 0.72g triphenyl phosphate TPP, 1.2g antioxidant 1010 and 332g crystallization accelerator Polyethylene glycol 10000, polymerized under normal compression for 45 minutes, gradually reduced the pressure in the reactor to 60Pa within 45 minutes, and at the same time raised the temperature to 275°C, polycondensed for 2 hours under high vacuum; when the intrinsic viscosity reached the target value, filled Inject nitrogen, press out the resin from the reaction kettle under nitrogen pressure, and obtain copolyester slices through water cooling, drawing, and pell...

Embodiment 2

[0032] Put 4.98kg of terephthalic acid, 2.41kg of ethylene glycol, and 0.28kg of 1,4-butanediol into the esterification axe, and carry out the esterification reaction at 0.2~0.4MPa and 260°C; After the output reaches the target value, transfer it to the polycondensation kettle, add catalyst 0.6g antimony trioxide, 0.32g tetrabutyl titanate, stabilizer 1.05g triphenyl phosphate TPP, 0.95g antioxidant 1010 and crystallization Accelerator 348g polyethylene glycol 4000, after 60 minutes of normal compression polymerization, gradually reduce the pressure in the reactor to 60Pa within 45 minutes, and at the same time raise the temperature to 275 ° C, high vacuum polycondensation for 2 hours; when the intrinsic viscosity reaches the target After the value is filled, nitrogen is filled, and under nitrogen pressure, the resin is extruded from the reaction kettle, and the copolyester chips are obtained by water cooling, drawing, and pelletizing; then the chips are dried and pre-crystalli...

Embodiment 3

[0034] 4.64kg terephthalic acid, 0.35kg isophthalic acid, 2.41kg ethylene glycol, 996g polytetrahydrofuran 2000, 1.16g antimony trioxide catalyst, 0.26g tetrabutyl titanate, 1.05g triphenyl phosphate stabilizer Put TPP and 0.95g antioxidant 1010 into the esterification axe, carry out esterification reaction at 0.2~0.4MPa, 260°C, when the distilled amount of water generated by esterification reaches the target value, transfer it to the polycondensation kettle , after 60 minutes of normal compression polymerization at 260°C, gradually reduce the pressure in the reactor to 60Pa within 45 minutes, and at the same time raise the temperature to 270°C, and perform high vacuum polycondensation for 2 hours; when the intrinsic viscosity reaches the target value, fill in Nitrogen, under the pressure of nitrogen, the resin is pressed out from the reactor, and the copolyester slices are obtained by water cooling, drawing, and pelletizing; then the slices are dried and pre-crystallized at 13...

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Abstract

The invention discloses a low-melting point and high-crystallization temperature PET (polyethylene terephthalate) copolyester, its preparation method and application. The PET copolyester comprises, by mass: 70%-88% of PET, 5%-10% of a melting point adjusting agent, and 7%-20% of a crystallization accelerating agent. According to the preparation method, in a synthesis process of PET, based on p-phthalic acid (PTA) and ethylene glycol (EG), the melting point adjusting agent and the crystallization accelerating agent are added to undergo a chemical reaction together, thus obtaining the low-melting point and high-crystallization temperature PET copolyester. The PET copolyester provided by the invention has a low melting point and a high crystallization temperature, and has improved processing molding performance, thus being widely applicable in injection molding products.

Description

technical field [0001] The invention relates to a PET copolyester, in particular to a PET copolyester with a low melting point and a high crystallization temperature and a preparation method and application thereof. Background technique [0002] Polyethylene terephthalate PET is cheap and has excellent performance, so its usage is increasing year by year. Due to the high rigidity of the main chain of PET, the movement of the chain segments is slow, and the crystallization speed is relatively slow, which leads to high injection mold temperature, long injection molding cycle, and easy warping of the product, which severely restricts its application in engineering plastics. [0003] In order to solve the problems of high mold temperature and long molding cycle in the injection molding process of PET, it can be realized by lowering the melting point and increasing the crystallization temperature. In the prior art, the melting point of PET can be reduced by copolymerization. For...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L71/08C08L71/02C08L67/04C08K5/092C08K5/12C08K5/053C08G63/183C08G63/80
Inventor 赵巍徐依斌苑仁旭焦建钟宇科曾祥斌蔡彤旻宁凯军
Owner KINGFA SCI & TECH CO LTD
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