Semiaromatic polyamide, semiaromatic polyamide resin composition, and molded article

一种聚酰胺树脂、半芳香族的技术，应用在半芳香族聚酰胺树脂组合物及成型品,半芳香族聚酰胺领域，能够解决成型品厚度变化、反应难以控制、成型品力学强度降低等问题，达到优异物性、高熔融张力、控制结晶性和耐热性的效果

Active Publication Date: 2015-07-22
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, it is difficult to control the reaction of the polyamide resin and the reactive modifying material, so local thickening occurs when the resin stays, which sometimes causes a change in the thickness of the molded product
In addition, cross-linked gel may be formed and the appearance of molded products may deteriorate
In addition, in order to increase the melt viscosity of polyamide itself, a long-chain methylene group is introduced into the main chain, resulting in a significant decrease in the mechanical strength of the molded product, which is also a big problem.

Method used

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  • Semiaromatic polyamide, semiaromatic polyamide resin composition, and molded article
  • Semiaromatic polyamide, semiaromatic polyamide resin composition, and molded article
  • Semiaromatic polyamide, semiaromatic polyamide resin composition, and molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] 1906 g (11.5 moles) of terephthalic acid, 2800 g (24.1 moles) of 1,6-hexamethylene diamine, 1271 g (7.6 moles) of isophthalic acid, 699 g (4.8 moles) of adipic acid, 36.5 g (0.3 moles) of benzoic acid ), 5.7 g of sodium hypophosphite monohydrate (0.08% by weight relative to the raw material), and 545 g of distilled water were put into an autoclave with an inner volume of 13.6 L, and replaced with nitrogen. Stirring was started from 190°C, and the internal temperature was increased to 250°C over 3 hours. At this time, the internal pressure of the autoclave was increased to 3.03 MPa. After continuing the reaction in this state for 1 hour, air was released from a nozzle provided in the lower part of the autoclave, and the low-grade condensate was taken out. Then, after cooling to room temperature, it was pulverized to a particle size of 1.5 mm or less with a pulverizer, and dried at 110°C for 24 hours. The moisture content of the obtained low-grade condensate was 4100 ppm...

Embodiment 2

[0216] Except having changed the amount of terephthalic acid and isophthalic acid, it carried out similarly to Example 1, and prepared polyamide resin (PA2). Table 1 shows the physical properties of the obtained polyamide resin.

Embodiment 3

[0218] Except having changed the amount of terephthalic acid and isophthalic acid, it carried out similarly to Example 1, and prepared polyamide resin (PA3). Table 1 shows the physical properties of the obtained polyamide resin.

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Abstract

The purpose of the present invention is to provide: a semiaromatic polyamide which has excellent heat resistance, chemical resistance and mechanical characteristics, while exhibiting moldability that is suitable for various component materials for automobiles and the like; and a molded article of this semiaromatic polyamide. A semiaromatic polyamide (I) of the present invention contains 35-50% by mole of a structural unit derived from terephthalic acid [A], 25-40% by mole of a structural unit derived from isophthalic acid [B], 15-35% by mole of a structural unit derived from an aliphatic dicarboxylic acid [C] (provided that the total of [A], [B] and [C] is 100% by mole), and a structural unit derived from an aliphatic diamine [D] having 4-12 carbon atoms. The molar ratio ([A] / [B]) is from 65 / 35 to 50 / 50, and the molar ratio ([C] / [B]) is from 30 / 70 to 50 / 50. The melting enthalpy (∆H) of the semiaromatic polyamide (I) as determined by differential scanning calorimetry (DSC) is 20-40 mJ / mg, and the limiting viscosity [η] of the semiaromatic polyamide (I) is 0.7-1.6 dl / g.

Description

Technical field [0001] The present invention relates to semi-aromatic polyamides, semi-aromatic polyamide resin compositions and molded products. Background technique [0002] Polyamides represented by nylon 6, nylon 66, etc. are excellent in molding processability, mechanical properties, and chemical resistance, so they are widely used as materials for various parts such as clothing, industrial materials, automobiles, electrical / electronics, or industrial use. . [0003] However, in recent years, the mechanical properties, fuel barrier properties, and coolant resistance, and other functions required for polyamide molded articles have been further improved due to the demand for metal replacement for the purpose of reducing the weight of parts. More specifically, the current situation is that the heat resistance, dimensional stability, mechanical properties, chemical resistance, etc. of the conventional nylon 6 and nylon 66 are insufficient and cannot be used in automobile fuel pip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08J5/04C08K7/02C08L23/00C08L63/00C08L77/06
CPCC08L77/06C08K3/16C08G69/28C08L51/06C08K7/14C08F255/00C08K5/005C08G69/265C08F222/06C08L33/14C08L23/0815C08G69/26
Inventor 鹫尾功江端洋树影山文雄小坂寿誉小笠原英人天野晶规泷泽信宏
Owner MITSUI CHEM INC
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