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A kind of high crystallization rate polyamide and its preparation method and application

A technology of polyamide and high crystallization, which is applied in the field of polymers, and can solve problems such as affecting the injection molding process, slowing down the crystallization rate, and slowing down the crystallization rate of materials.

Active Publication Date: 2020-10-30
KINGFA SCI & TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high crystallization rate polyamide and its preparation method and application
  • A kind of high crystallization rate polyamide and its preparation method and application
  • A kind of high crystallization rate polyamide and its preparation method and application

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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 present invention provides a polyamide having a high crystallization rate. A crystalline peak width at half maximum ΔT1 / 2 of the polyamide is 6-12ºC. The polyamide having the high crystallization rate is composed of a repeating unit formed by dicarboxylic acid and diamine. The polyamide is composed of the following repeating unit derived from the following: (a) aromatic diacid and aliphatic diacid; and (b) 1,10-diaminodecane and aliphatic diamine having the number of carbon atoms of 2-13 in addition to 1,10-diaminodecane, the aromatic diacid being 70-100 mol% of (a); 1,10-diaminodecane being 70-100 mol% of (b). The polyamide having a high crystallization rate in the present invention has a high crystallization rate, shortens the injection molding period of a material, and improves the production efficiency. The present invention also provides a preparation method for the polyamide. The method has simple operations and raw materials which are cheap and easily obtained, and is suitable for large-scale production. No additives such as a nucleating agent for improving the crystalline rate of the polyamide are added, thus having few influences on the basic property of the polyamide.

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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Patent Type & Authority Patents(China)
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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