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Semi-aromatic polyamide resin and preparation method thereof

A polyamide resin and semi-aromatic technology, which is applied in the field of polymer material synthesis, can solve the problems of weak bonding force between thermal stabilizers and polymers, reduced heat resistance of thermal stabilizers, and inability to achieve long-term thermal stability. Improve product mechanical properties, increase thermal stability, and reduce losses

Inactive Publication Date: 2020-04-10
ZHONGLUN PLASTIC IND FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the low molecular weight of the heat stabilizer reduces the heat resistance of the heat stabilizer, that is, the heat stabilizer begins to oxidize and decompose at a lower temperature, and cannot achieve the effect of thermally stabilizing the polymer product under high temperature conditions
Moreover, the thermal stabilizer added by blending has a weak binding force with the polymer, and it is easy to precipitate in the later use process, and it cannot achieve long-term thermal stability.

Method used

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  • Semi-aromatic polyamide resin and preparation method thereof
  • Semi-aromatic polyamide resin and preparation method thereof
  • Semi-aromatic polyamide resin and preparation method thereof

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preparation example Construction

[0056] A kind of preparation method of described semi-aromatic polyamide resin is characterized in that, comprises the following steps,

[0057] S1: Weigh the required aromatic / aliphatic dibasic acid, aliphatic dibasic amine, hindered phenol or hindered amine, catalyst, and deionized water into the autoclave, vacuumize the autoclave, and fill it with nitrogen to Remove the residual air in the reactor, and keep a slight positive pressure in the high-pressure reactor after the replacement; preferably, the slight positive pressure is 10-50kPa;

[0058] S2: Under the condition of stirring, the autoclave is heated and then reacted at a constant temperature, and then the temperature continues to rise. After the pressure reaches 1.2-5MPa, the temperature continues to rise and at the same time, the method of releasing the water vapor in the autoclave makes the interior of the autoclave in a state of In a constant pressure state, when the temperature rises to 240-340°C, slowly release ...

Embodiment 1

[0069] (1) Weigh 830.7g terephthalic acid, 730.7g adipic acid, 1137.7g hexamethylenediamine, 2.5g hindered phenol 2,6-di-tert-butyl-4-aminophenol, 1g catalyst sodium hypophosphite, 1200g Add deionized water into the autoclave, vacuumize the autoclave and fill it with nitrogen, repeat three times to remove the residual air in the autoclave, and keep a slight positive pressure of 25kPa in the autoclave after the replacement is completed;

[0070] (2) Under the condition of 100r / min stirring, the autoclave is heated up to 100°C, reacted at constant temperature for 1.5h, and then continues to heat up to 235°C. After the pressure reaches 2.5MPa, the temperature continues to rise and at the same time, it starts to release the pressure in the autoclave. The method of water vapor keeps the inside of the autoclave in a constant pressure state, and when the temperature rises to 300°C, the autoclave is slowly released to normal pressure within 1 hour;

[0071] (3) Fill the autoclave with...

Embodiment 2

[0073](1) Weigh 1661.3g terephthalic acid, 1686.9g decanediamine, 2.5g hindered amine 2,2,6,6-tetramethylpiperidinamine, 1.3g catalyst sodium phosphite, 2000g deionized water In the autoclave, vacuumize the autoclave and fill it with nitrogen, repeat three times to remove the residual air in the autoclave. After the replacement is completed, the autoclave retains a slight positive pressure of 40kPa;

[0074] (2) Under the condition of 200r / min stirring, the autoclave is heated up to 150°C, reacted at constant temperature for 2 hours, and then continues to heat up to 240°C. After the pressure reaches 3MPa, the temperature continues to rise and at the same time, it begins to release water vapor in the autoclave. The method is to keep the autoclave in a constant pressure state, and when the temperature is raised to 315 ° C, the autoclave is slowly released to normal pressure within 1.5 hours;

[0075] (3) Fill the autoclave with nitrogen to a pressure of 0.3 MPa, extrude the mate...

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Abstract

The invention discloses semi-aromatic polyamide resin and a preparation method thereof. The semi-aromatic polyamide resin comprises, in parts by weight, 20 to 80 parts of aromatic / aliphatic dibasic acid, 20 to 80 parts of aliphatic diamine, 0.05 to 1 part of hindered phenol or hindered amine, 0.01 to 0.06 part of a catalyst, 30 to 160 parts of deionized water, wherein in the aromatic / aliphatic dibasic acid, the mass ratio of the aromatic dibasic acid to the aliphatic dibasic acid is 1:(0-9). A hindered phenol or hindered amine chemical group is connected to the tail end of a polyamide molecular chain through a chemical bond; the loss of the hindered phenol or hindered amine chemical group in a low-temperature environment is reduced; by adding a processing aid in the later-stage modification processing process, the phenomenon of heat stabilizer agglomeration or non-uniform dispersion during the modification does not exist, and the production cost is reduced, so that the product has goodthermal stability at the high temperature for a long time, and the mechanical property and the quality of the product are improved.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a semi-aromatic polyamide resin and a preparation method thereof. Background technique [0002] Polyamide, commonly known as nylon, the English name is Polyamide, which is a general term for polymers containing amide groups in the repeating unit of the main chain of the macromolecule. It can be obtained by ring-opening polymerization of lactam, or by polycondensation of diamine and dibasic acid. Because polyamide has high impact strength and excellent wear resistance, heat resistance, chemical resistance, lubricity and dyeability, etc., especially the strength and product precision of polyamide after strengthening or alloy modification , Dimensional stability, etc. have been greatly improved, so it is widely used in machinery, automobiles, electrical appliances, textile equipment, chemical equipment, aviation, metallurgy and other fields. [0003] There are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08G69/28
CPCC08G69/265C08G69/28
Inventor 叶鹭斌康杰林冰城杨剑停汤锡銮陈志强
Owner ZHONGLUN PLASTIC IND FUJIAN
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