Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A PCT chain extension method

A chain-end, short-chain alkyl technology, applied in the field of chain extension of polyterephthalic acid/1,4-cyclohexanedimethanol ester, can solve the problems of expensive chain extenders and yellowing of color, and achieve The effect of low cost and simple preparation method

Active Publication Date: 2021-08-24
浙江新长城高分子材料有限公司 +1
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A PCT chain extension method
  • A PCT chain extension method
  • A PCT chain extension method

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 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 feed to ...

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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

A method for chain extension of PCT, which is implemented according to the following steps: adding a special auxiliary agent for polyester tackification into PCT, making the auxiliary agent uniformly dispersed in PCT and making the functional group contained on the surface of the auxiliary agent and the end of the PCT molecular chain OH or ‑COOH reacts to realize the chain extension of PCT; the special additive for polyester tackification is obtained by modifying the surface of inorganic non-metallic particles with silane coupling agent, and the surface contains functional groups and short-chain alkyl groups. Inorganic non-metallic particles; the silane coupling agent is composed of at least one silane coupling agent with a functional group at the end and at least one silane coupling agent with a short-chain alkyl group at the end, and the functional group is A group that can react with -OH or -COOH at the end of the PCT molecular chain, the number of carbon atoms of the short-chain alkyl group is 3-8; the surface of the inorganic non-metallic particles contains hydroxyl or carboxyl, and its particle size range at 10‑200nm. The PCT chain extension method provided by the present invention 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com