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Branched polyamide and its preparation method

A branched-chain polyamide and lactam technology, which is applied in the field of branched-chain polyamide and its preparation, can solve the problems of low tensile breaking strength of branched polyamide fibers, poor mold release properties of branched polyamide resin, affecting application, and the like, Achieve the effects of excellent dyeing performance, excellent mold release, and short reaction time

Active Publication Date: 2017-12-15
株洲时代工程塑料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-branched polyamides also have problems such as poor mold release and easy adhesion of branched polyamide resins; low tensile breaking strength of branched polyamide fibers, which affects their application in the field of high-strength fibers. The synthesis and preparation of branched polyamides with one or more branched structures hardly involves

Method used

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  • Branched polyamide and its preparation method
  • Branched polyamide and its preparation method
  • Branched polyamide and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A preparation method for star chain branching agent A1, comprising the following steps:

[0033]Use dichloromethane / triethylamine mixture as solvent, the mass ratio of dichloromethane to triethylamine is 5:1, first fully dissolve 0.6mol cyclosuccinic anhydride in 500ml solvent, then slowly add 0.1mol triamine Under anhydrous and oxygen-free conditions, the reaction temperature is controlled at -40°C, and the ring-opening amidation reaction is carried out. After 6 hours of reaction, the initial product is obtained. After separation, filtration and purification, the carboxyl-terminated three-arm star chain is obtained. Branching agent, the code is A1. According to DSC (differential scanning calorimetry) analysis test, it can be seen that the thermal decomposition temperature of the star chain branching agent A1 is 264°C.

Embodiment 2

[0035] A preparation method for star chain branching agent A2, comprising the following steps:

[0036] Using dichloromethane / triethylamine mixture as solvent, the mass ratio of dichloromethane to triethylamine is 5:1, first fully dissolve 0.8mol cycloglutamic anhydride in 600ml solvent, then slowly add 0.1mol 2,3 , 5,6-tetraaminobenzene, under anhydrous and oxygen-free conditions, the reaction temperature is controlled at -10 ° C, and the ring-opening amidation reaction is carried out. After 6 hours of reaction, the initial product is obtained. After separation, filtration and purification, the terminal Carboxyl four-arm star chain branching agent, code A2. According to the DSC analysis test, it can be seen that the thermal decomposition temperature of the star chain branching agent A2 is 273°C.

Embodiment 3

[0038] A preparation method of hyperbranched chain branching agent B1, comprising the following steps:

[0039] Using acetone as a solvent, add 0.25mol cyclosuccinic anhydride and 0.1mol melamine to 500ml solvent, react under anhydrous and oxygen-free conditions, the reaction temperature is 20°C, and the reaction time is 4h to obtain a mixed product; heat the mixed product To 220°C, control the reaction pressure to 4000Pa, and the reaction time is 8h to obtain the primary product; after the primary product is dissolved, precipitated, filtered and separated, the carboxyl-terminated hyperbranched chain branching agent is obtained, and its number-average molecular weight is 9200, and the serial number is B1. According to the DSC analysis test, it can be seen that the thermal decomposition temperature of the hyperbranched chain branching agent B1 is 270°C.

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Abstract

The invention discloses a branched polyamide and a preparation method thereof. The branched polyamide is prepared from a monomer, a catalyst and a composite chain branching agent through ring-opening reaction and polycondensation reaction. The preparation method comprises (1) adding a monomer, a catalyst and a composite chain branching agent into a high-pressure reactor, and heating to 120° C. to 150° C. under the protection of nitrogen to fully disperse and dissolve the composite chain branching agent to obtain a mixture; ( 2) The mixture is subjected to a ring-opening reaction and polycondensation reaction at 200° C. to 300° C. to obtain a branched polyamide. The branched polyamide melt of the present invention has high fluidity, low melting temperature, good process release property, good dyeing performance, good mechanical properties, simple preparation process, short reaction time and good process stability.

Description

technical field [0001] The invention relates to a branched polyamide and a preparation method thereof, in particular to a branched polyamide initiated by two chain branching agents and a preparation method thereof. Background technique [0002] According to the different branched chain structures, branched polymers can be divided into three categories: star branched polymers, dendritic branched polymers and hyperbranched polymers. Branched polyamide (ie branched polyamide) is a type of polyamide material with a branched chain structure. Due to the unique molecular structure of branched polyamide, it has significant advantages in processing rheology, dissolution and dispersion, and surface adsorption. [0003] At present, the synthesis and preparation of branched polyamides has become a hot spot in the research of special polyamides. As Warakomski described in the literature Synthesis and Properties of Star-Branched Nylon 6, Chem.Mater.1992, 4, 1000-1004 (1992), a star-shap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/14C08G69/16
Inventor 杨克俭胡天辉汤鑫焱王文志姜其斌邓凯恒
Owner 株洲时代工程塑料科技有限责任公司
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