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

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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, c

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

Examples

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Example Embodiment

[0029] Example 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℃; when the amount of water distilled from esterification reaches After the target value, transfer it to the polycondensation kettle, add 0.5g antimony trioxide catalyst, 0.24g tetrabutyl titanate, stabilizer 0.72g triphenyl phosphate TPP, 1.2g antioxidant 1010 and crystallization accelerator 332g Polyethylene glycol 10000, usually compressed for 45 minutes, gradually reduce the pressure in the reactor to 60 Pa within 45 minutes, and at the same time increase the temperature to 275 ℃, high vacuum polycondensation for 2 hours; when the intrinsic viscosity reaches the target value, charge Enter nitrogen, press out the resin from the reactor under nitrogen pressure, and obtain copolyester chips after water cooling, drawing, and pelletizing; then the chips are dried and pre-...

Example Embodiment

[0031] Example 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℃; when the water produced by esterification is distilled After the output reaches the target value, transfer it to the polycondensation kettle, add 0.6g antimony trioxide catalyst, 0.32g tetrabutyl titanate, stabilizer 1.05g triphenyl phosphate TPP, 0.95g antioxidant 1010 and crystal Promoter 348g polyethylene glycol 4000, after 60 minutes of normal compression polymerization, gradually reduce the pressure in the reactor to 60 Pa within 45 minutes, and at the same time increase the temperature to 275 ℃, high vacuum polycondensation for 2 hours; when the intrinsic viscosity reaches the target After the value, fill with nitrogen, press out the resin from the reactor under nitrogen pressure, and obtain copolyester chips after water cooling, striping, and pelletizing; then the c...

Example Embodiment

[0033] Example 3

[0034] Combine terephthalic acid 4.64 kg, isophthalic acid 0.35 kg, ethylene glycol 2.41 kg, polytetrahydrofuran 2000 996 g, catalyst 1.16 g antimony trioxide, 0.26 g tetrabutyl titanate, stabilizer 1.05 g triphenyl phosphate TPP and 0.95g antioxidant 1010 are put into the esterification axe, and the esterification reaction is carried out at 0.2~0.4MPa and 260℃. When the distillate amount of the water produced by the esterification reaches the target value, it is transferred to the polycondensation kettle , After 60 minutes of normal compression polymerization at 260℃, gradually reduce the pressure in the reactor to 60Pa within 45 minutes, while increasing the temperature to 270℃, high vacuum polycondensation for 2 hours; when the intrinsic viscosity reaches the target value, charge Nitrogen, press out the resin from the reactor under nitrogen pressure, and obtain copolyester chips after water cooling, drawing and pelletizing; then, the chips are dried and pre...

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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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