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Semiaromatic polyamide resin composition and molded body obtained by molding same

A polyamide resin and semi-aromatic technology, which is applied in the field of semi-aromatic polyamide resin compositions, can solve the problems of physical property degradation, thermal aging, and retention stability, and achieve fluidity improvement, thermal aging suppression, and retention stability The effect of sexual decline

Active Publication Date: 2016-10-12
UNITIKA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of inhibiting heat aging due to the addition of copper compounds is not sufficient. In addition, when a resin composition containing a copper compound is left at a high melting temperature for a long time, a decrease in physical properties due to thermal cracking may occur, and molding Physical appearance problems
[0008] That is, in the molding process of semi-aromatic polyamides with a melting point of 300°C or higher, especially non-copolymerized highly crystalline semi-aromatic polyamides, in addition to the above-mentioned problems of poor fluidity and thermal aging during melt processing , if it stays in a molten state in the device, there is a problem of so-called retention stability, such as a decrease in physical properties due to thermal cracking and a poor appearance in the molded product.

Method used

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  • Semiaromatic polyamide resin composition and molded body obtained by molding same
  • Semiaromatic polyamide resin composition and molded body obtained by molding same
  • Semiaromatic polyamide resin composition and molded body obtained by molding same

Examples

Experimental program
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Effect test

Embodiment

[0093] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.

[0094] 1. Measurement method

[0095] The physical properties of the semi-aromatic polyamide and the semi-aromatic polyamide resin composition were measured by the following methods.

[0096] (1) Melting point

[0097] Using a differential scanning calorimeter DSC-7 type (manufactured by Perkin Elmer Co.), the temperature was raised to 370° C. at a heating rate of 20° C. / min under a nitrogen atmosphere, kept at 370° C. for 5 minutes, and cooled at a cooling rate of 20° C. / min. After reaching 25°C and further maintaining at 25°C for 5 minutes, the peak top of the endothermic peak obtained when the temperature was raised again at a heating rate of 20°C / min was measured as the melting point.

[0098] (2) relative viscosity

[0099] Measurement was performed at a concentration of 1 g / dL at 25° C. using 96% by mass sulfuric acid as a solvent.

[010...

manufacture example 1

[0169] ·Semi-aromatic polyamide (A-1)

[0170] 4.70 kg of powdered terephthalic acid (TPA) as an aromatic dicarboxylic acid component, 0.32 kg of stearic acid (STA) as a monocarboxylic acid component, and 9.3 g of sodium hypophosphite monohydrate as a polymerization catalyst Put it into a ribbon mixing reaction apparatus, and heat to 170 degreeC, stirring at 30 rpm under nitrogen sealing. Thereafter, 4.98 kg of 1,10-decanediamine (DDA) heated to 100° C. as an aliphatic diamine component was injected using a liquid injection device while maintaining the temperature at 170° C. and the rotational speed at 30 rpm. The addition was continued (continuous liquid injection system) over 2.5 hours to obtain a reaction product. The molar ratio of the raw material monomers is TPA:DDA:STA=48.5:49.6:1.9 (the equivalent ratio of the functional groups of the raw material monomers is TPA:DDA:STA=49.0:50.0:1.0).

[0171] Next, the obtained reaction product was heated and polymerized in the sa...

Embodiment 1

[0179] 99 parts by mass of semi-aromatic polyamide (A-1) and 1 part by mass of polyol (B-1) were dry-blended, and a continuous quantitative supply device CE-W-1 (Kubota Co., Ltd.) was measured, supplied to the main feed port of a co-rotating twin-screw extruder TEM26SS type (Toshiba Machine Co., Ltd.) with a screw diameter of 26 mm and L / D50, and melt-kneaded. On the way, 45 parts by mass of the fibrous reinforcement (C-1) was supplied from the side feed port, and kneaded further. After being drawn into a linear shape from a die, it was cooled and solidified by passing through a water tank, and cut with a pelletizer to obtain semi-aromatic polyamide resin composition pellets. The barrel temperature of the extruder was set to (melting point of semi-aromatic polyamide + 5°C) to (melting point of semi-aromatic polyamide + 15°C), the screw speed was set to 250 rpm, and the discharge rate was set to 25 kg / h.

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Abstract

A semiaromatic polyamide resin composition which contains a semiaromatic polyamide (A) and a polyhydric alcohol (B), and which is characterized in that: the mass ratio of the semiaromatic polyamide (A) to the polyhydric alcohol (B), namely (A) / (B) is from 99.95 / 0.05 to 90 / 10; and the semiaromatic polyamide (A) contains, as constituents, an aromatic dicarboxylic acid component and an aliphatic diamine component, and has a melting point of 300-350DEG C.

Description

technical field [0001] The present invention relates to semi-aromatic polyamide resin compositions. Background technique [0002] Semi-aromatic polyamides are widely used as molding materials because of their excellent heat resistance and mechanical properties. Among them, semi-aromatic polyamides having a melting point of 300° C. or higher are used in applications requiring particularly high heat resistance, such as automotive engine peripherals and LED lighting. [0003] In general, it is known that the higher the melting point of the semi-aromatic polyamide, the less fluidity during melt processing and the lower the physical properties in a high-temperature environment (heat aging) tends to occur. [0004] Patent Document 1 discloses that the fluidity during melt processing is improved by capping a semi-aromatic polyamide with a long-chain monocarboxylic acid. [0005] In addition, Patent Document 2 discloses that fluidity is improved by blending a polyhydric alcohol. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K5/053C08K5/103C08K7/04
CPCC08K5/053C08L77/06C08K7/06C08K9/08C08G69/26C08G69/28C08K7/14C08L2201/08C08L2205/025C08L2205/06C08L29/02C08K3/04C08L77/00C08K7/04C08K5/103C08J5/00C08J2377/06C08K5/06C08K5/11
Inventor 三井淳一甘利太阳上川泰生
Owner UNITIKA LTD
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