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Preparation method of polyamide elastomer

A technology of polyamide elastomer and polyamide, which is applied in the field of preparation of polyamide elastomer, can solve the problems of poor reaction stability, incomplete reaction, opacity, etc., and achieve good reaction stability, fast reaction speed and good transparency

Active Publication Date: 2020-04-14
WUXI YINDA NYLON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]The problem of using short carbon chain nylon as the hard segment is that the compatibility between short carbon chain polyamide and polyether is very poor, and short carbon chain polyamide and polyether cannot Miscibility may lead to incomplete reaction, poor reaction stability, and worse, may form polyamide phase with a large number of polyamide chains and a small amount of polyether chains, and polyamide phase with a large number of polyether chains and a small amount of polyamide chains. Ether phase, although the material obtained by polymerization has a certain viscosity and can be molded, but due to the existence of two phases, the melt is opaque and milky white, and the performance of the molded product is very poor, which cannot meet the use requirements

Method used

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  • Preparation method of polyamide elastomer

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Effect test

Embodiment 1

[0023] A kind of preparation method of polyamide elastomer, comprises the following steps:

[0024] (1) Under an inert atmosphere, add 100 parts of hexamethylene sebacamide salt, 16 parts of sebacic acid, and 300 parts of deionized water into the reaction kettle, stir, heat up to 200°C, open the exhaust valve, and discharge water vapor Maintain the pressure of the reactor at 1.5MPa. After 3 hours of reaction, open the exhaust valve to slowly relieve the pressure, and at the same time let the reaction temperature rise to 240°C. Vacuum 1500Pa, react at 240°C for 1 hour to obtain polyamide 610 oligomer;

[0025] (2) Add 300 parts of polytetrahydrofuran diol (molecular weight 1000) and 1 part of tetrabutyl titanate to the reaction system of step (1), and continue to react for 2 hours at a temperature of 240° C. and a pressure of 100 Pa, then cool down to 180°C, stand still for 3 hours, take out the polyamide elastomer oligomer in the lower layer, add 16 parts of sebacic acid, 1 p...

Embodiment 2

[0027] A kind of preparation method of polyamide elastomer, comprises the following steps:

[0028] (1) Add 100 parts of hexamethylene dodecanoyl diamine salt, 15 parts of dodecanedioic acid, and 300 parts of deionized water into the reaction kettle, stir, heat up to 200°C, open the exhaust valve, and discharge water vapor to maintain the reaction The pressure of the kettle is 1.5MPa. After 3 hours of reaction, open the exhaust valve to release the pressure slowly, and at the same time let the reaction temperature rise to 240°C. When the pressure in the kettle is normal pressure, close the exhaust valve, and the reactor is vacuumed to maintain a vacuum of 1000Pa. , and reacted for 2 hours at a temperature of 240° C. to obtain a polyamide 612 oligomer;

[0029] (2) Add 300 parts of polytetrahydrofuran diol (molecular weight 1000) and 1 part of tetrabutyl titanate to the reaction system of step (1), and continue to react for 2 hours at a temperature of 240° C. and a pressure of ...

Embodiment 3

[0031] A kind of preparation method of polyamide elastomer, comprises the following steps:

[0032] (1) Add 100 parts of hexamethylene adipamide salt, 20 parts of adipic acid, and 300 parts of deionized water into the reactor, stir, heat up to 210°C, open the exhaust valve, and discharge water vapor to maintain the pressure of the reactor at 1.5 MPa, after 3 hours of reaction, open the exhaust valve to slowly relieve the pressure, and at the same time let the reaction temperature rise to 250 °C. Reaction at ℃ for 2 hours to obtain polyamide 66 oligomer;

[0033] (2) Add 300 parts of polytetrahydrofuran diol (molecular weight 650) and 1.5 parts of tetrabutyl titanate to the reaction system of step (1), and continue to react for 2 hours at a temperature of 250° C. and a pressure of 100 Pa, then cool down to Take out the precipitated polyamide elastomer oligomer at 120°C, add 20 parts of adipic acid and 2 parts of tetrabutyl titanate, and continue to react for 2 hours at a tempe...

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Abstract

The invention relates to a preparation method of a polyamide elastomer, and belongs to the technical field of elastomer material preparation. The preparation method comprises the following steps: (1)in an inert atmosphere, mixing a polyamide salt, an end-capping reagent and water, reacting for 2-5 hours at a temperature of 180-210 DEG C under a pressure of 1.0-2.0 MPa, relieving the pressure to normal pressure, vacuumizing, and continuously reacting for 1-2 hours; (2) adding excessive polyether and a catalyst, and continuously reacting for 2-3 hours at a temperature of 230-250 DEG C under a pressure of 20-100 Pa; (3) reducing the temperature of the reaction system to 180-200 DEG C, and carrying out standing separating to obtain an oligomer; and (4) in an inert atmosphere, mixing the oligomer and a chain extender, and carrying out a reaction for 2-5 h at a temperature of 230-250 DEG C under a pressure of 20-100 Pa to obtain the polyamide elastomer. According to the invention, the preparation method is used for polymerization of short-carbon-chain polyamide and polyether, the reaction speed is high, the reaction stability is good, and the obtained polyamide elastomer is good in transparency and excellent in performance and can be widely applied to the aspects of automobiles, sporting goods, medical supplies, sealing members, mechanical parts and the like.

Description

technical field [0001] The invention relates to a preparation method of a polyamide elastomer, which belongs to the technical field of elastomer material preparation. Background technique [0002] Polyamide elastomer is a block copolymer, which is composed of high melting point crystalline nylon hard segment and non-crystalline or amorphous polyester or polyether soft segment. Their chemical composition, segment length and ratio between It determines the physical and chemical properties of this type of material. Nylon elastomer has high strength, high toughness, good elasticity, low specific gravity, good bending fatigue resistance, good wear resistance, good low temperature performance, and can be widely used in automobiles, sporting goods, medical supplies, seals, mechanical parts, etc. aspect. [0003] Polyamide elastomers are mostly copolymerized from long carbon chain polyamides and polyether polyols. French company Arkema first synthesized polyamide elastomer by usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/40
CPCC08G69/40
Inventor 沈俊毅陈尚标胡瑞莉殷炼伟
Owner WUXI YINDA NYLON