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Chain extension method for PCT

A chain-end, short-chain alkyl technology is applied in the field of chain extension of poly(terephthalic acid/1,4-cyclohexane dimethanol ester), which can solve the problems of high price of chain extender and yellowing in color, etc. The effect of low cost and simple preparation method

Active Publication Date: 2019-09-27
浙江新长城高分子材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some people have also developed a chain extender whose main chain is PSt (polystyrene), molecular weight ~ 12000, and 8 epoxy groups per 100 C atoms. color turns yellow
In addition, the above-mentioned chain extenders are very expensive. Although the dosage is small (0.2-1.0% is generally added to polyester), the price is basically 120-380 yuan / Kg

Method used

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  • Chain extension method for PCT
  • Chain extension method for PCT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 480mL deionized water, 120mL industrial alcohol, 60g SiO 2 (Wanjing New Materials Co., Ltd., VK-SP30), 1.5mL γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) (Aladdin Shanghai Biochemical Co., Ltd.), 3mL n-octyl Triethoxysilane (KH-832) (Aladdin Shanghai Biochemical Co., Ltd.) (the volume ratio of the two siloxanes is 1:2), mix well under mechanical stirring, and then adjust the pH value with 10wt% dilute hydrochloric acid to 4, stirred at room temperature for 4 h to obtain a nanoslurry with a solid content of 10 wt%. After the resulting nano-slurry was spray-dried (190°C, the slurry inlet rate was 5mL / min), the modified nano-SiO 2 Particles are tackifiers.

[0036] The tackifier obtained above is added to PCT (Korean SK company, model 3402) (hand mixing gets final product), and the addition is 5wt% of PCT consumption, then in parallel twin-screw extruder (Labtech Engineering Company Ltd. ;Model: LTE20-40), at 280°C, 290°C, 285°C, 300°C (set sequentially from the ...

Embodiment 2

[0038]Others are the same as in Example 1, but the volume ratio of KH560 / KH832 is changed to 1:1, that is, the volumes of KH560 and KH832 are both 2.25mL. It was found that the melting index dropped from 100g / 10min of pure PCT to 34.8g / 10min. It is proved that there is a chain extension effect.

Embodiment 3

[0040] Others are the same as in Example 1, but the volume ratio of KH560 / KH832 is changed to 2:1. That is, the volume of KH560 is 3mL, and the volume of KH832 is 1.5mL. It was found that the melting index dropped from 100g / 10min of pure PCT to 12.8g / 10min. It proves that the effect of chain extension is more obvious.

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Abstract

A chain extension method for PCT (polycaprolactam) comprises the following steps: a special assistant for polyester tackifying is added to the PCT, and is uniformly dispersed in the PCT, a functional group contained on the surface of the assistant reacts with -OH or -COOH at the end of the molecular chain of the PCT to realize chain extension of the PCT. The special assistant for polyester tackifying is an inorganic nonmetallic particle containing a functional group and a short-chain alkyl group at the surface, obtained by modifying the surface of an inorganic nonmetallic particle with a silane coupling agent; the silane coupling agent is composed of at least one silane coupling agent having the functional group at the tail end and at least one silane coupling agent having the short-chain alkyl group at the tail end, the functional group is a group capable of reacting with the -OH or -COOH at the end of the molecular chain of the PCT, and the number of carbon atoms in the short-chain alkyl group is 3 to 8; and the surface of the inorganic nonmetallic particle is a hydroxyl group or a carboxyl group, and the particle size is 10-200 nm. The chain extension method for PCT has the advantages of simplicity, high efficiency and low cost.

Description

[0001] (1) Technical field [0002] The invention relates to a method for chain extension of poly terephthalic acid / 1,4-cyclohexane dimethanol (PCT). [0003] (2) Background technology [0004] PCT is a high temperature resistant engineering plastic with excellent performance. However, the molecular weight of PCT is usually not high during polymerization. To further increase the molecular weight, the polymerization time must be extended, which will lead to stirring difficulties and thermal degradation. Post-reaction tackification is a good way to increase the molecular weight of polyester. At present, the common polyester chain extenders in the market are oligomers containing epoxy side groups, and the molecular weight is generally 5000-50000. The basic principle is to use the reaction between epoxy groups and polyester macromolecule terminal carboxyl or terminal hydroxyl groups to form comb-shaped or linear macromolecules. Due to the increase in molecular weight, the moldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K9/06C08K3/36
CPCC08K3/36C08K9/06C08L67/02
Inventor 陶金祥何立波冯杰郑华均
Owner 浙江新长城高分子材料有限公司
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