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Transparent polyamide and preparation method thereof

A polyamide and transparent technology, which is applied in the field of transparent polyamide and its preparation, can solve the problems of reduced spatial regularity of molecular chains, weakened hydrogen bond interaction, and imperfect crystallization process of polymers, etc., achieving slow crystallization rate, The effect of moderate cost and high crystallinity

Active Publication Date: 2014-07-09
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the introduction of the ring structure reduces the stereoregularity of the polymer molecular chains and weakens the hydrogen bonding between the molecular chains, resulting in the imperfect crystallization process of the polymer, and finally can only form crystals with a size smaller than the wavelength of visible light. microcrystals

Method used

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  • Transparent polyamide and preparation method thereof
  • Transparent polyamide and preparation method thereof
  • Transparent polyamide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 1000g of deionized water into the reaction kettle, turn on the stirrer, add 300g of nylon 66 salt, 22g of adipic acid, 120g of dodecanedioic acid, 120g of 4,4'-diamino-dicyclohexyl-methane, Add it into deionized water; when the raw materials are stirred and mixed evenly, add 0.5g of benzoic acid and 0.1g of hypophosphorous acid into the reaction kettle, and continue to stir until all the above raw materials are mixed evenly;

[0030] (2) Close the reaction kettle in step (1), fill the reaction kettle with nitrogen and vacuumize 3 to 5 times to discharge the air in the reaction kettle; then fill the reaction kettle with nitrogen to make the initial pressure in the reaction kettle Maintain between 0.2MPa;

[0031] (3) Turn on the heating device, and maintain the initial pressure of step (2) at 0.2MPa. The temperature of the reactor is uniformly raised from room temperature to 180°C within 90 minutes, and kept for 30 minutes. At the same time, the pressure in the r...

Embodiment 2

[0036](1) Add 1000g of deionized water into the reaction kettle, turn on the stirrer, add 270g of nylon 66 salt, 20g of adipic acid, 139g of dodecanedioic acid, 139g of 4,4'-diamino-dicyclohexyl-methane, Add it into deionized water; when the raw materials are stirred and mixed evenly, add 0.3g of benzoic acid and 0.08g of hypophosphorous acid into the reaction kettle, and continue to stir until all the above raw materials are mixed evenly;

[0037] (2) Close the reaction kettle in step (1), fill the reaction kettle with nitrogen and vacuumize 3 to 5 times to discharge the air in the reaction kettle; then fill the reaction kettle with nitrogen to make the initial pressure in the reaction kettle Maintain between 0.5MPa;

[0038] (3) Turn on the heating device, and maintain the initial pressure of step (2) at 0.5MPa. The temperature of the reactor is uniformly raised from room temperature to 220°C within 120 minutes, and the temperature is maintained for 60 minutes. At the same t...

Embodiment 3

[0043] (1) Add 1000g of deionized water into the reaction kettle, turn on the stirrer, add 300g of nylon 66 salt, 22g of adipic acid, 100g of dodecanedioic acid, 100g of 4,4'-diamino-dicyclohexyl-methane, Add it into deionized water; when the raw materials are stirred and mixed evenly, add 0.5g of benzoic acid and 0.1g of hypophosphorous acid into the reaction kettle, and continue to stir until all the above raw materials are mixed evenly;

[0044] (2) Close the reaction kettle in step (1), fill the reaction kettle with nitrogen and vacuumize 3 to 5 times to discharge the air in the reaction kettle; then fill the reaction kettle with nitrogen to make the initial pressure in the reaction kettle Maintain between 0.5MPa;

[0045] (3) Turn on the heating device, and maintain the initial pressure of step (2) at 0.5MPa. The temperature of the reactor is uniformly raised from room temperature to 200°C within 100 minutes, and kept warm for 50 minutes. At the same time, the pressure in...

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Abstract

The invention relates to transparent polyamide and a preparation method thereof. The method provided by the invention utilizes a copolymerization approach and the structural characteristics of aliphatic diacid monomer and alicyclic diamine monomer structure, and aliphatic diacid and alicyclic diamine undergo copolymerization with an amide salt, thus obtaining the transparent polyamide material with light transmissivity up to over 80% in a visible wavelength range. Due to low crystallization rate and difficult grain growth of the transparent polyamide material during preparation, finally the transparent polyamide material with a microcrystal structural characteristic is formed. As the grain size of the crystalline portion constituting the transparent polyamide material with the microcrystal structural characteristic is smaller than the visible wavelength, the material has transparency. At the same time, the transparent polyamide material with the microcrystal structure still has a high degree of crystallinity, and can maintain high mechanical strength.

Description

technical field [0001] The invention belongs to the field of preparation and production of polyamide and polyamide copolymer, and in particular relates to a transparent polyamide and a preparation method thereof. Background technique [0002] As a member of the family of polymer materials, polyamide is the earliest developed, the most widely used, the most demanded, and the most mature researched. Its preparation and synthesis methods and related physical and chemical properties have been reported in many documents and patents. Polyamide has good advantages such as high strength, good thermal stability, and environmental resistance, making it widely used in automobiles, electronic appliances, industrial machinery, textiles, consumer goods and other industries. [0003] Generally, when the light transmittance of a substance in the visible light wavelength range (390nm-770nm) reaches more than 80%, it is defined as having transparency. As a kind of polyamide with special prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28
Inventor 马永梅彭中樑曹新宇赵斌贺丹
Owner INST OF CHEM CHINESE ACAD OF SCI
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