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High crystallization rate polyamide, preparation method and application thereof

A technology of polyamide and high crystallization, which is applied in the field of polymers, can solve the problems of mechanical properties and yellowing resistance, affecting the injection molding process, and slow crystallization rate of materials, so as to shorten the molding cycle, inhibit the generation of gel, The effect of improving productivity

Active Publication Date: 2018-08-10
KINGFA SCI & TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Uneven polyamide molecular chain structure slows down the crystallization rate and affects the injection molding process
In order to increase the crystallization rate of polyamide, it is common practice to add 0.1%-5% nucleating agent during the blending and extrusion process. However, if the amount of nucleating agent added exceeds 0.2%, it will cause adverse effects on the mechanical properties and yellowing resistance of the material. influence, and the nucleating agent has limited help to increase the crystallization rate of the material, and cannot fundamentally solve the problem of slow crystallization rate of the material

Method used

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  • High crystallization rate polyamide, preparation method and application thereof
  • High crystallization rate polyamide, preparation method and application thereof
  • High crystallization rate polyamide, preparation method and application thereof

Examples

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Embodiment 1-10

[0050] The preparation method of embodiment 1-10 high crystallization rate polyamide:

[0051] Pre-polymerization step: According to the ratio in Table 1, add the weighed dicarboxylic acid, diamine and nylon salt into the pressure vessel equipped with magnetic coupling stirring, condenser, gas phase port, feeding port and pressure explosion-proof port , benzoic acid, sodium hypophosphite, filled with N after vacuuming 2 To normal pressure, repeat vacuuming and then fill with N 2 process three times, and finally the N 2 The pressure rose to 0.3MPa. The temperature was raised to 220°C with stirring over 2 hours, the reaction mixture was stirred at 220°C for 1 hour, then the temperature of the reactants was raised to 230°C with stirring. The reaction continued for 2 hours at a constant temperature of 230°C and a constant pressure of 2.2MPa. The pressure was kept constant by removing the formed water. After the reaction was completed, it was discharged in a spray state, and the...

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Abstract

The invention provides a high crystallization rate polyamide with a crystallization peak half-peak width Delta T1 / 2 of 6-12DEG C. The high crystallization rate polyamide is composed of a repeat unit formed by dicarboxylic acid and diamine. The high crystallization rate polyamide is composed of a repeat unit derived from the following: (a) aromatic diacid and aliphatic diacid; (b) 1, 10-diaminodecane and aliphatic diamine with a carbon atom number of 2-13 except 1, 10-decanediamine; wherein, the aromatic diacid accounts for 70-100mol% of (a), and 1, 10-decanediamine accounts for 70-100mol% of (b). The high crystallization rate polyamide provided by the invention has high crystallization rate, shortens the injection molding period of the material, and improves the production efficiency. Theinvention also provides a preparation method of the polyamide, the method has the characteristics of simple operation, cheap and easily available raw materials, and is suitable for large-scale production. Nucleating agent and other additives capable of improving the polyamide crystallization rate are not added, and the influence on the basic properties of polyamide is little.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a polyamide with high crystallization rate and its preparation method and application. Background technique [0002] Due to its excellent mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubricating properties, polyamide is widely used in the fields of electronics, automobiles, home appliances, sporting goods, etc. It is currently the most used engineering plastics. High-temperature-resistant polyamides, mainly semi-aromatic polyamides, have broad application prospects in the electrical and electronic industries because of their higher heat-resistant temperature and dimensional stability. The development trend of miniaturization of electrical equipment requires high temperature resistant polyamide to have a higher crystallization rate in order to shorten the molding cycle and reduce molding defects. [0003] At present, "prepolymeriza...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28
CPCC08G69/265C08G69/28
Inventor 阎昆张传辉曹民姜苏俊曾祥斌黄险波麦杰鸿龙杰明蒋志强杨汇鑫常欢
Owner KINGFA SCI & TECH CO LTD
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