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Yellowing-resistant polyamide resin and preparation method thereof

A polyamide resin and polyamide technology, applied in the field of yellowing-resistant polyamide resin and its preparation, can solve the problems of segment breakage, uneven dispersion of additives, poor photo-oxidative stability, thermal-oxidative stability and poor weather resistance.

Active Publication Date: 2020-06-12
CATHAY R&D CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyamide, especially polyamide 56, has excellent elasticity, toughness, impact resistance and corrosion resistance, but its anti-ultraviolet aging ability is poor, and the polyamide molecular chain is prone to segmental breakage under long-term light exposure. It leads to molecular degradation. Therefore, its photo-oxidative stability, thermal oxygen stability and weather resistance are poor. At present, stabilizers are commonly used to modify polyamides when modifying polyamides. Commonly used stabilizers include the following types: One is hindered phenol stabilizer, the other is hindered amine stabilizer, the third is phosphite stabilizer, and the fourth is copper halide stabilizer
[0004] When using a stabilizer to modify polyamide resin, there is often a problem of uneven dispersion of additives, resulting in local yellowing of polyamide resin products during use

Method used

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  • Yellowing-resistant polyamide resin and preparation method thereof
  • Yellowing-resistant polyamide resin and preparation method thereof
  • Yellowing-resistant polyamide resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0098] Embodiment a pentamethylenediamine adipate

[0099] Replace the air in the 100-liter enamel salt-forming kettle by vacuuming and filling it with nitrogen three times, and protect it with nitrogen. Add 22kg of 1,5-pentanediamine (99.5% purity) and 1.5kg of deoxygenated water into the salt-forming kettle (Oxygen content is 0.01mg / L, accounting for 2.4% of the total weight of 1,5-pentanediamine and adipic acid), heat the mixture of 1,5-pentanediamine and water to 112, add 31.6kg of hexane Diacid (purchased from PetroChina Liaoyang Petrochemical Company, with a purity of 99%), keep the above temperature and under vigorous stirring, the reaction system becomes viscous, stir continuously for 3 hours, add acid and amine in small amounts to make the final dibasic acid amine salt The pH is 7.3.

[0100] Charge nitrogen into the polymerization kettle to a pressure of 0.2MPa (gauge pressure), start melting and discharging, and use a slicer to cool and slice to obtain white pentam...

Embodiment b

[0101] Embodiment b pentamethylenediamine adipate

[0102] Replace the air in the 100-liter enamel salt-forming kettle by vacuuming and filling nitrogen three times, and protect it with nitrogen, add 22kg 1,5-pentanediamine and 31.6kg adipic acid to the salt-forming kettle, heat, and then add 2.1kg deoxygenated water (oxygen content is 0.01mg / L, accounting for 4% of the total weight of 1,5-pentanediamine and adipic acid), control the temperature to 85°C, keep the above temperature and under strong stirring, the reaction system Become viscous, stir continuously for half an hour, add acid and amine in small amounts, and adjust the final pH of the dibasic acid amine salt to 7.0.

[0103] Charge nitrogen into the polymerization kettle to a pressure of 0.2 MPa (gauge pressure), start to melt and discharge, and use a slicer to cool and slice to obtain white pentamethylenediamine-adipate, with a weight of 44.1 kg and a purity of 99.5%. Dibasic acid amine salt crystals do not have th...

Embodiment c

[0104] Example c Pentamethylenediamine adipate

[0105] Replace the air in the 100-liter enamel salt-forming kettle by vacuuming and filling nitrogen three times, and protect it with nitrogen, add 22kg 1,5-pentanediamine and 31.6kg adipic acid to the salt-forming kettle, heat, and then add 4.3kg deoxygenated water (oxygen content 0.01mg / L, accounting for 8% of the total weight of 1,5-pentanediamine and adipic acid), control the temperature to 70°C, keep the above temperature and under strong stirring, the reaction system Become viscous, continue to stir for half an hour, add acid and amine in small amounts, adjust the final pH of the dibasic acid amine salt to 8.3.

[0106] Charge nitrogen into the polymerization kettle to a pressure of 0.2 MPa (gauge pressure), start melting and discharging, and use a slicer to cool and slice to obtain white pentamethylenediamine-adipate, with a weight of 44.7 kg and a purity of 99.5%. Dibasic acid amine salt crystals do not have the charact...

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Abstract

The invention relates to diacid amine salt, yellowing-resistant polyamide resin and a preparation method of the yellowing-resistant polyamide resin. The dibasic acid amine salt provided by the invention is prepared from deoxygenated water, and has the advantages of high stability, light color and no yellowing. The polyamide resin provided by the invention has good yellowing resistance, and the method effectively inhibits the generation of by-products through anaerobic operation treatment, thereby improving the yellowing resistance of the polyamide material under the conditions of high temperature and illumination. The polyamide resin is lasting in yellowing resistance, the preparation method is low in cost and convenient to operate, existing equipment does not need to be adjusted and modified too much, and the method is suitable for the existing polyamide production process.

Description

technical field [0001] The invention relates to the field of polymer materials, and specifically relates to a yellowing-resistant polyamide resin and a preparation method thereof. Background technique [0002] Polyamide material is one of the five major engineering plastics, with excellent performance and wide application. Because of its excellent toughness, heat and cold resistance, wear resistance, non-toxic, easy to dye, easy to shape, it is widely used in textiles, automobiles, material manufacturing and other fields. [0003] Polyamide, especially polyamide 56, has excellent elasticity, toughness, impact resistance and corrosion resistance, but its anti-ultraviolet aging ability is poor, and the polyamide molecular chain is prone to segmental breakage under long-term light exposure. It leads to molecular degradation. Therefore, its photo-oxidative stability, thermal oxygen stability and weather resistance are poor. At present, stabilizers are commonly used to modify po...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28C07C209/00C07C211/09C07C51/41C07C55/14
CPCC07C51/412C07C209/00C08G69/26C08G69/28C07C211/09C07C55/14
Inventor 杜宇鎏秦兵兵刘修才
Owner CATHAY R&D CENT CO LTD
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