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Polyamide composition and preparation method thereof

A technology of polyamide composition and polyamide monomer is applied in the field of polymer material science to achieve the effect of saving reaction time, saving energy and accelerating the reaction rate

Active Publication Date: 2016-05-25
JIANGSU RUIMEIFU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research on PA has been very extensive at home and abroad, the research on the polymerization reaction of PA has never been interrupted. The improvement of PA monomer composition and production process has always been the subject of research in the polyamide industry.

Method used

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  • Polyamide composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of polyamide composition and preparation method thereof:

[0047] The polymerization is carried out in a heated autoclave with stirring means and removal of volatile by-products.

[0048] Melt 4000g of caprolactam at 80°C, then add 8g of ethyl isocyanate, and then add 120mL of desalted water, 8g of benzoic acid and 2g of heat stabilizer after 30 minutes.

[0049] Replace the air in the kettle with high-purity nitrogen three times, then start stirring and raise the temperature to 250°C over 2 hours, and keep the pressure at 250°C for 2 hours. Then vent (pay attention to slow exhaust) the pressure in the kettle to normal pressure and drain water. After the pressure in the kettle reaches normal pressure, close the valve and raise the temperature to 260°C. When the temperature rises to 260°C, start vacuuming to keep the pressure in the kettle at -0.01MPa . The time for vacuuming is to achieve a relative viscosity of 2.1 to 2.4.

[0050] Example 1 corresponds to the ...

Embodiment 2

[0052] A kind of polyamide composition and preparation method thereof:

[0053] The polymerization is carried out in a heated autoclave with stirring means and removal of volatile by-products.

[0054] Melt 4000g of caprolactam at 80°C, add 14g of diphenylmethane diisocyanate (MDI), and then add 120mL of desalted water, 8g of benzoic acid and 2g of heat stabilizer after 30 minutes.

[0055] Replace the air in the kettle with high-purity nitrogen three times, then start stirring and raise the temperature to 250°C over 2 hours, and keep the pressure at 250°C for 2 hours. Then vent (pay attention to slow exhaust) the pressure in the kettle to normal pressure and drain water. After the pressure in the kettle reaches normal pressure, close the valve and raise the temperature to 260°C. When the temperature rises to 260°C, start vacuuming to keep the pressure in the kettle at -0.1MPa . The vacuuming time is 2h.

[0056] Example 2 corresponds to the production of a polyamide compos...

Embodiment 3

[0058] A kind of polyamide composition and preparation method thereof:

[0059] The polymerization is carried out in a heated autoclave with stirring means and removal of volatile by-products.

[0060] Melt 4000g of caprolactam at 80°C, add 13.8g of 1,1′,1″-methylenetris(4isocyanate)benzene, and then add 120mL of desalted water, 8g of benzoic acid and 2g of heat stabilizer after 30 minutes.

[0061] Replace the air in the kettle with high-purity nitrogen three times, then start stirring and raise the temperature to 250°C over 2 hours, and keep the pressure at 250°C for 2 hours. Then vent (pay attention to slow exhaust) the pressure in the kettle to normal pressure and drain water. After the pressure in the kettle reaches normal pressure, close the valve and raise the temperature to 260°C. When the temperature rises to 260°C, start vacuuming to keep the pressure in the kettle at -0.03MPa . The time for vacuuming is to achieve a relative viscosity of 2.1 to 2.4.

[0062] Exam...

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Abstract

The invention relates to the technical field of polymer material science, in particular to a polyamide composition. The polyamide composition is mainly prepared from, by weight, 50-95 parts of first polyamide monomer, 0.01-10 parts of first auxiliary and 0.01-20 parts of second auxiliary. The first polyamide monomer is aromatic-aliphatic lactam of C2-C20 and / or aliphatic lactam of C2-C20. The first auxiliary is one or more of compounds containing isocyanate groups. The second auxiliary is prepared from one or more of desalted water, organic monocarboxylic or dicarboxylic acid, heat stabilizer, a nucleating agent, antioxidant, fire retardant, colorant and a delustering agent. Compared with traditional polyamide, the polyamide composition has excellent reaction time and melt flowing performance, and the quality stability is further improved. The invention further provides a preparation method of the polyamide composition, and the method is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of polymer material science, in particular to a polyamide composition and a preparation method thereof. Background technique [0002] Polyamide is commonly known as nylon (Nylon), and its English name is Polyamide (PA). It is a general term for polymers containing amide groups in the repeating unit of the macromolecular main chain. Polyamides can be prepared by ring-opening polymerization of lactams, or by polycondensation of diamines and dibasic acids. It was the DuPont company of the United States that first developed the resin for fiber, and it was industrialized in 1939. In the 1950s, the development and production of injection molding products began to replace metals to meet the requirements of lightweight and cost-reducing downstream industrial products. [0003] PA has many excellent properties and is widely used in textiles, films, engineering plastics and other fields. Although the research on PA...

Claims

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Application Information

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IPC IPC(8): C08G69/16C08G69/26C08K5/29
CPCC08G69/16C08G69/26C08K5/29
Inventor 杨勇杨纪财
Owner JIANGSU RUIMEIFU IND