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Semi-aromatic polyamide resin

A semi-aromatic polyamide and polyamide resin technology, which is used in synthetic resin layered products, layered products, transportation and packaging, etc., can solve the problem of reduced freedom of fuel piping system design, insufficient fuel permeation resistance, etc. problems, achieving excellent stiffness and fuel barrier properties, excellent chemical resistance, dimensional stability and excellent creep resistance

Active Publication Date: 2008-05-07
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the fuel permeation prevention performance of pipe joints such as quick joints as joints, it has been proposed to arrange O-rings, or to spin-weld pipe joints and resin pipes to improve the sealing performance between them. methods (refer to Patent Documents 11 and 12), however, nylon 12 resin and nylon 66 resin, which are widely used as constituent resins of quick joints and other pipeline joints, have insufficient fuel permeation performance, and a higher level of fuel permeation prevention is required In terms of performance, it is necessary to increase the thickness of the pipe joints, or reduce the number of arrangements of the pipe joints themselves in the fuel piping system, which is expected to greatly reduce the degree of freedom in the design of the fuel piping system

Method used

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  • Semi-aromatic polyamide resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0203] (1) Preparation of semi-aromatic polyamide resin (PA9T-1)

[0204] A mixture of 4539.3g (27.3mol) terephthalic acid, 4478.8g (28.3mol) 1,9-nonanediamine and 2-methyl-1,8-octanediamine [the former / the latter=80 / 20( Molar ratio)], 101.6 g (0.83 mol) of benzoic acid, 9.12 g (0.1% by mass of the total mass of the raw materials) sodium hypophosphite monohydrate and 2.5 L of distilled water were put into an autoclave with an internal volume of 20 L, and nitrogen replacement was performed. The mixture was stirred at 100°C for 30 minutes, and then the temperature inside the autoclave was increased to 220°C over 2 hours. At this time, the pressure inside the autoclave was increased to 2 MPa. The reaction was continued under this condition for 2 hours, then the temperature was increased to 230°C, and the temperature was maintained at 230°C for 2 hours, and the water vapor was slowly removed, and the pressure was maintained at 2 MPa to proceed the reaction. Next, the pressure was redu...

Embodiment 2

[0210] (1) Preparation of semi-aromatic polyamide resin (PA9T-2)

[0211] A mixture of 4537.3g (27.3mol) terephthalic acid, 4496.5g (28.4mol) 1,9-nonanediamine and 2-methyl-1,8-octanediamine [the former / the latter=80 / 20( Molar ratio)], 84.4 g (0.69 mol) of benzoic acid, 9.12 g (0.1% by mass of the total mass of the raw materials) sodium hypophosphite monohydrate and 2.5 L of distilled water were put into an autoclave with an internal volume of 20 L, and nitrogen replacement was performed. The mixture was stirred at 100°C for 30 minutes, and then the temperature inside the autoclave was increased to 220°C over 2 hours. At this time, the pressure inside the autoclave was increased to 2 MPa. The reaction was continued under this condition for 2 hours, then the temperature was increased to 230°C, and the temperature was maintained at 230°C for 2 hours, and the water vapor was slowly removed, and the pressure was maintained at 2 MPa to proceed the reaction. Then, the pressure was reduc...

Embodiment 3

[0217] (1) Preparation of semi-aromatic polyamide resin (PA9T-3)

[0218] A mixture of 4525.9g (27.2mol) terephthalic acid, 4496.5g (28.5mol) 1,9-nonanediamine and 2-methyl-1,8-octanediamine [the former / the latter=80 / 20( Molar ratio)], 77.4 g (0.63 mol) of benzoic acid, 9.12 g (0.1% by mass of the total mass of raw materials) sodium hypophosphite monohydrate and 2.5 L of distilled water were put into an autoclave with an internal volume of 20 L, and nitrogen replacement was performed. The mixture was stirred at 100°C for 30 minutes, and then the temperature inside the autoclave was increased to 220°C over 2 hours. At this time, the pressure inside the autoclave was increased to 2 MPa. The reaction was continued under this condition for 2 hours, then the temperature was increased to 230°C, and the temperature was maintained at 230°C for 2 hours, and the water vapor was slowly removed, and the pressure was maintained at 2 MPa to proceed the reaction. Next, the pressure was reduced t...

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Abstract

The present invention provides a semi-aromatic polyamide resin having high residence stability, hot water resistance and chemical resistance and also having excellent adhesion property to and compatibility with other resin or the like. [MEANS FOR SOLVING PROBLEMS] The semi-aromatic polyamide resin has dicarboxylate units in which aromatic dicarboxylate units comprise 50 to 100 mol% of the dicarboxylate units and diamine units in which aliphatic diamine units having 9 to 13 carbon atoms comprises 60 to 100 mol% of the diamine units. In the resin, at least 10% of the terminal groups present in the molecular chain are end-capped with an end-capping agent, and the amount of the terminal amino groups present in the molecular chain falls within the range from 60 [mu]-equivalents / g to 120 [mu]-equivalents / g inclusive and satisfies the equation: [NH2] / [COOH]=6 wherein [NH2] ([mu]-equivalent / g) represents the amount of the terminal amino groups and [COOH] ([mu]-equivalent / g) represents the amount of the terminal carboxyl groups.

Description

Technical field [0001] The present invention relates to a semi-aromatic polyamide resin whose polymer terminal is highly controlled. More specifically, the present invention relates to not only showing excellent adhesion or compatibility with various resin materials used when forming polymer alloys, but also showing excellent mechanical strength, low water absorption, dimensional stability and retention stability For example, semi-aromatic polyamide resins suitable for molding materials such as production materials, industrial materials, and household goods, and polyamide resin compositions containing the semi-aromatic polyamide resins. The present invention also relates to a chemical delivery hose (pipe), which contains at least one layer formed of a polyamide resin composition containing the above-mentioned semi-aromatic polyamide resin and modified The polyolefin resin. The present invention also relates to a pipe joint that has a small amount of fuel permeation through the wal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26B32B27/34C08L23/26C08L77/06
CPCC08G69/26B32B27/34C08L77/06B32B1/08C08K7/02Y10T428/1393C08G69/32
Inventor 内田光一菊池博文柏村次史山下隆山崎洋挥
Owner KURARAY CO LTD
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