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Yellowing-resistant polyamide resin and preparation method thereof

A polyamide resin and polyamide technology, applied in the field of polyamide resin with anti-yellowing effect and its preparation, can solve problems such as yellowing, weak stability, and easy yellowing

Active Publication Date: 2020-06-12
CATHAY R&D CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamide 56, like other polyamide materials, has the problem of yellowing
Moreover, since the hydrogen bond between chains in polyamide 56 is not as tight as that of polyamide 66, its structural stability is relatively weak, and it is more prone to yellowing under high temperature and light conditions.

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 1

[0065] The preparation of embodiment 1 polyamide 56

[0066] Deoxygenate the pure water by ultrasound, that is, add 1L of pure water into a 2L flask, and place the flask in an ultrasonic device that is filled with water. The water level of the ultrasonic device exceeds the water level in the flask. First turn on the ultrasound with a frequency of 35kHz, then evacuate the inside of the device to vacuum, and keep it for 3-5 minutes, then fill it with nitrogen to normal pressure, then repeat the pumping and inflation 3-5 times, and then fill it with nitrogen to return to normal pressure. Insert a long needle below the water surface to blow nitrogen gas at a flow rate of 30mL / min, and export nitrogen gas through another needle above the water surface, keep the nitrogen gas flowing for 1 hour with the ultrasound turned on, turn off the ultrasound and stop the nitrogen gas flow, and seal it for storage. Take this deoxygenated water sample through a needle tube to measure the oxygen ...

Embodiment 2

[0074] The preparation of embodiment 2 polyamide 56

[0075]1 L of deoxygenated water was prepared using the same method as in Example 1, and the oxygen content was determined to be 0.04 mg / L. Then the adipic acid of 600g, 0.026g sodium hypophosphite (25ppm, the percentage is the mass percent of pentamethylenediamine-adipate) and 0.031g anhydrous copper acetate (30ppm, the percentage is the mass percent of pentamethylenediamine-hexane The mass percent of the diacid acid salt) is added to the batching container, and after repeated pumping and nitrogen filling for 3 times, the normal pressure is restored. Deoxygenated water is then introduced into the batching container, followed by adding 440g of pentamethylenediamine through a conduit, stirred and dissolved, and prepared into a polyamide salt solution, wherein pentamethylenediamine-adipate accounts for 50% of the total weight of the polyamide salt solution. A small amount of the above solution was diluted to 10% and the pH va...

Embodiment 3

[0082] The preparation of embodiment 3 polyamide 56

[0083] A thermal atmospheric deaerator (purchased from Lianyungang Guanghe Electric Power Equipment Co., Ltd., the model is an atmospheric vacuum deaerator) was used to deoxygenate the pure water to obtain deoxygenated water. Deoxygenated water is sent to the reaction unit through the boiler feed water pump. During the deaeration process, the working steam pressure of the equipment is 0.02MPa, the internal pressure of the deaerator is 0.2MPa, the water temperature is 104°C, and the contact time between steam and water is 17min.

[0084] With 500kg pentamethylenediamine-adipic acid crystalline salt, 12.5g sodium hypophosphite (25ppm, percentage is accounted for the mass percentage of pentamethylenediamine-adipate) and 15.0g copper acetate (30ppm, percent is accounted for pentamethylenediamine -mass percentage of adipate) was added to the batching container, and after repeated pumping and nitrogen filling for 3 times, the no...

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Abstract

The invention relates to polyamide resin with good yellowing resistance and a preparation method thereof. According to the method, by adding an anti-yellowing agent and an antioxidant and using deoxygenation operation treatment, the generation of impurities in the pentamethylene diamine-adipic acid nylon salt is effectively inhibited, and meanwhile, the yellowing resistance of the polyamide resinunder high-temperature and illumination conditions can be improved. The method provided by the invention is low in cost and convenient to operate, does not need excessive adjustment and transformationon the existing equipment, and 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 polyamide resin with anti-yellowing effect 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 materials are easily degraded under the conditions of light, heat, oxygen and impurities, resulting in aging yellowing. The main reason for this is that polyamides undergo oxidative degradation during thermal processes, which reduces their molecular weight. During this process, the amide bond in polyamide is prone to breakage due to its low dissociation energy. At the same time, under the action of oxygen, the amide group will a...

Claims

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Application Information

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IPC IPC(8): C08G69/26C08G69/28
CPCC08G69/26C08G69/28
Inventor 杜宇鎏秦兵兵张强刘修才
Owner CATHAY R&D CENT CO LTD
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