Homopolymer and copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and synthesis method thereof

A technology of high temperature resistance and polyamide, which is applied in the field of long carbon chain semi-aromatic high temperature resistance polyamide PA10T and its synthesis, and can solve the problems of color tone, high production cost, unfavorable environmental protection and the like

Active Publication Date: 2011-08-17
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the selection of organic solvents will greatly increase production costs and involve the problem of solvent recovery, which is extremely challenging for industrial production and is also very detrimental to environmental protection. If green and environmentally friendly solvents are used on the basis of meeting the same performance requirements The production of PA10T by this method has more important significance; in addition, the prepolymer with relatively low intrinsic viscosity will bring a great burden to the later solid-phase polymerization, and the molecular weight distribution of the product after polymerization will be relatively wide, and the required physical properties must be achieved. Mechanical properties requi

Method used

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  • Homopolymer and copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and synthesis method thereof

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[0026] The invention provides a method for synthesizing long-chain semi-aromatic polyamide and its copolymer. The polyamide is mainly made of terephthalic acid and 1,10-decanediamine, and may also contain aromatic, alicyclic or aliphatic other diacids, lactams, amino acids and nylon salts. Or several. The melting point of the semi-aromatic polyamide obtained by the two-step polymerization method is between 270-320°C, which belongs to the category of high-temperature nylon. One of the characteristics of the semi-aromatic polyamide is that it has both the excellent physical and mechanical properties, thermal deformation of the fully aromatic polyamide and the good processing performance and impact resistance of the aliphatic polyamide; the second feature is its molecular structure The excellent low water absorption determined by the low amide group content in the polyamide is very important for maintaining the performance and dimensional stability of the product during use; the...

Embodiment 1

[0064] Embodiment 1 PA10T homopolymer

[0065] Mix 2500g of terephthalic acid, 2600g of 1,10-decanediamine, 5g of sodium hypophosphite, 40g of benzoic acid and 3000g of deionized water in a 25L closed polymerization kettle, replace the air in the kettle with nitrogen twice, and stir The speed is 20r / min, the temperature is raised to 130°C for salt-forming reaction, the reaction time is 3h, then the temperature is raised and the system pressure is raised to 2.5-2.7MPa within 2h, the constant pressure reaction is carried out and the pressure is released when the temperature is rapidly raised to 300°C, 30min Discharge to normal pressure, react at normal pressure for 15 minutes, fill with nitrogen and pressurize the material, the prepolymer is extruded through the die head of the discharge port to granulate, and the surface of the material is cooled by air to maintain the good color of the material.

[0066] Dry the prepolymer at 80°C for 24 hours and put it into the vacuum drum. ...

Embodiment 2

[0067] Embodiment 2 PA10T homopolymer

[0068] The previous steps are the same as in Example 1. After 15 minutes of reaction at normal pressure, vacuum devolatilization for 10 minutes is carried out, and the material is discharged under pressure with nitrogen filling. Good color. The properties of the prepolymer are shown in Table 1.

[0069] The solid-phase polymerization conditions are the same as in Example 1, and the performance comparison between the prepolymer and the final polymer is shown in Table 2.

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Abstract

The invention provides a method for synthesizing a homopolymer and a copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and polymerization products obtained by the method. The method comprises the following steps of: (a) prepolymerizing terephthalic acid and 1,10-decanediamine in a molar ratio of 1:(1.00-1.02) and optional copolymerization components to obtain a prepolymer that the intrinsic viscosity is controlled to be between 0.4 and 1.1dl/g; and (b) performing solid-phase polymerization on the prepolymer in step (a) to obtain the long-carbon-chain semi-aromatic high-temperature-resistant polyamide PA10T or the copolymer thereof, wherein the intrinsic viscosity is controlled to be between 1.2 and 2.6dl/g.

Description

technical field [0001] The invention relates to a polyamide material, in particular to a long carbon chain semi-aromatic high temperature resistant polyamide PA10T and a synthesis method thereof. Background technique [0002] High temperature resistant polyamide is a member of the polyamide family. It has high temperature resistance due to its molecular structure containing benzene ring or other aromatic ring structure. It is usually composed of aliphatic, alicyclic diacid or diamine and aromatic It can also be obtained by polycondensation of three or more diacid / diamine monomers according to performance requirements. Semi-aromatic polyamide has become the main product of high temperature resistant nylon due to its superior physical and mechanical properties compared with aliphatic polyamide and unparalleled processing performance of aromatic polyamide. Representative products include DuPont's HTN series (PA6T / 66, etc. ), Kuraray's PA9T, Mitsubishi Gas's MXD6, DSM's PA46 an...

Claims

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Application Information

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IPC IPC(8): C08G69/30C08G69/02C08G69/36
CPCC08G69/26C08G69/30C08G69/265
Inventor 谷勤翠张怀忠杨桂生
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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