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Yellowing-resistant polyamide resin, and production raw materials and production method thereof

A technology of polyamide resin and production method, which is applied in the field of anti-yellowing polyamide resin and its production raw materials, which can solve problems such as difficult to meet the use requirements of high-end customers, affect product appearance and quality, and have color difference in product color, so as to improve the safety production factor , The sealing rate is improved, and the effect of saving energy

Pending Publication Date: 2019-05-03
ZHONGLUN PLASTIC IND FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyamide products are prone to side reactions and turn yellow at such a high temperature, that is, the color of the product before and after SMT has a color difference, which greatly affects the appearance and quality of the product, and it is difficult to meet the requirements of high-end customers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] S1. Weigh 1461.4g of adipic acid, 1138.9g of hexamethylenediamine, 1g of catalyst sodium hypophosphite, and 1600g of deionized water into the autoclave, vacuumize the autoclave and fill it with nitrogen, repeat three times to remove the autoclave After the replacement is completed, the high-pressure reactor retains a slight positive pressure of 25kPa;

[0041] S2. Under the stirring condition of 100r / min, heat the autoclave to 80°C, react at a constant temperature for 1.5h, and then continue to heat up to 220°C. After the pressure reaches 2.0MPa, the temperature continues to rise and at the same time, it starts to release the autoclave The method of internal water vapor keeps the inside of the autoclave in a constant pressure state, and when the temperature rises to 275°C, the autoclave is slowly released to normal pressure within 1.5 hours;

[0042] S3. Filling the high-pressure reactor with nitrogen to a pressure of 0.8 MPa, extruding the material from the die into st...

Embodiment 2

[0051] S1. Weigh 913.7g of terephthalic acid, 657.6g of adipic acid, 1138.9g of hexamethylenediamine, 1g of catalyst sodium hypophosphite, and 1600g of deionized water into the autoclave, and vacuumize and fill the autoclave with nitrogen. , repeat three times to remove the residual air in the reactor, and after the replacement is completed, the high-pressure reactor retains a slight positive pressure of 25kPa;

[0052] S2. Under the stirring condition of 100r / min, heat the autoclave to 100°C, react at constant temperature for 1.5h, and then continue to heat up to 235°C. After the pressure reaches 2.5MPa, the temperature continues to rise and at the same time start to release the autoclave The method of internal water vapor keeps the inside of the autoclave in a constant pressure state, and when the temperature rises to 315°C, slowly release the pressure of the autoclave to normal pressure within 1 hour;

[0053] S3. Fill the autoclave with nitrogen to a pressure of 0.8 MPa, a...

Embodiment 3

[0056] S1. Weigh 1661.3g terephthalic acid, 1688.6g decanediamine, 1.6g catalyst sodium phosphite, and 5000g deionized water into the autoclave, vacuumize the autoclave, fill with nitrogen, repeat three times to remove the reaction The remaining air in the autoclave, after the replacement is completed, the autoclave retains a slight positive pressure of 50kPa;

[0057] S2. Under the stirring condition of 300r / min, heat the autoclave to 150°C, react at constant temperature for 2 hours, then continue to heat up to 250°C, and when the pressure reaches 5MPa, the temperature continues to rise and at the same time, the water in the autoclave begins to be released The method of steam keeps the inside of the autoclave in a constant pressure state, and when the temperature rises to 320°C, slowly release the pressure of the autoclave to normal pressure within 0.5h;

[0058] S3. Fill the autoclave with nitrogen to a pressure of 2.5 MPa, extrude the material from the die head into strands...

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PUM

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Abstract

The invention belongs to the field of resin synthesis preparation, and concretely relates to a yellowing-resistant polyamide resin, and production raw materials and a production method thereof. The production method of the yellowing-resistant polyamide resin comprises the following steps: (1) performing an amidation reaction on a dibasic acid and a diamine under the action of a catalyst, and thengranulating the obtained polyamide resin to obtain polyamide resin particles; and (2) stirring and reacting the polyamide resin particles and a monofunctional isocyanate at 10-120 DEG C for 2-10 h inthe presence of an organic solvent, and performing filtration and drying to obtain the yellowing-resistant polyamide resin. The polyamide resin is produced by the method of the present invention, thepolyamide resin particles are swollen in the organic solvent to make the molecular chain in a nearly freely movable state, the monofunctional isocyanate enters the polyamide resin particles with the organic solvent to carry out an end capping reaction on the tail end of the polyamide molecular chain, the end capping reaction is carried out at a low temperature, and side reactions are very weak, sothat the finally obtained polyamide resin has good yellowing resistance.

Description

technical field [0001] The invention belongs to the field of resin synthesis, and in particular relates to a yellowing-resistant polyamide resin and its production raw materials and production method. Background technique [0002] The development of plastics has a long history, but the development of engineering plastics is relatively late. Polyamide, which ranks first among engineering plastics, was successfully developed and industrialized in 1939. Polyamide is commonly known as nylon (Nylon), and its English name is Polyamide. It is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain. Polyamides can be obtained by ring-opening polymerization of lactams, or by polycondensation of diamines and dibasic acids. There are many varieties of polyamides, including PA6, PA66, PA11, PA12, PA46, PA610, PA612, PAl010, etc., as well as new varieties such as semi-aromatic nylon PA6T, PA9T, PA10T and special nylon developed in rece...

Claims

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Application Information

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IPC IPC(8): C08G69/48C08G69/26C08G69/28
Inventor 简锦炽康杰周志威
Owner ZHONGLUN PLASTIC IND FUJIAN
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