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Preparation method for polyurethane chip for high-temperature-resistant fibers

A high-temperature-resistant fiber and polyurethane technology, which is applied in the field of polyurethane chip preparation, can solve the problems of high processing temperature, poor resilience and heat resistance, and difficult quality control of melt-spun spandex.

Inactive Publication Date: 2015-10-21
南通华盛高聚物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high processing temperature of melt-spun spandex, compared with dry-spun spandex, the resilience and heat resistance are poorer. In order to improve the performance of melt-spun spandex, it is necessary to modify its upstream product—polyurethane chips to improve the performance of the final product. , Chinese patent application CN01115739 adds nano-powder blending in spandex chips, and is used for spinning, which can improve the thermal performance and mechanical properties of melt-spun spandex; Chinese patent application CN200410065487 uses crosslinking agent, thermal Stabilizers and other additives are used to improve the performance of melt-spun spandex; however, it is difficult to control the blending uniformity of polyurethane chips and additives, and it is difficult to control the quality of melt-spun spandex

Method used

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  • Preparation method for polyurethane chip for high-temperature-resistant fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under nitrogen protection, stir terephthalic acid: adipic acid: 1,4-butanediol in a molar ratio of 10:40:70 at 50°C until uniform; , quickly raised the temperature to 100°C to start the reaction, raised the temperature to 235°C within 2 hours, and discharged the generated water to obtain a clear liquid; press the liquid into the polycondensation kettle, keep the temperature at 230°C, quickly reduce the pressure to 30kPa, and keep the temperature constant Change, the pressure is gradually reduced to 100Pa within 1h, and the reaction is completed to obtain polyester polyol with a molecular weight of 3000Da.

[0023] Use a metering pump to prepare polycarbonate polyol, 1,4-butanediol, hexamethylene diisocyanate, nano-silica, and nano-silica in a gas-phase method at a molar ratio of 1.03:0.97:2. The added amount is 1% of the total weight of raw materials, injected into reaction twin-screw with aspect ratio of 65, reacted at 120-190°C, granulated under water, dried and packa...

Embodiment 2

[0026] Under nitrogen protection, stir phthalic acid: succinic acid: 1,4-butanediol in a molar ratio of 15:35:60 at 60°C until uniform; , quickly raised the temperature to 100°C to start the reaction, raised the temperature to 260°C within 2 hours, and discharged the generated water to obtain a clear liquid; press the liquid into the polycondensation kettle, keep the temperature at 245°C, quickly reduce the pressure to 30kPa, and keep the temperature constant Change, the pressure is gradually reduced to 100Pa within 1h, and the reaction is completed to obtain polyester polyol with a molecular weight of 4000Da.

[0027] Use a metering pump to drive polycarbonate polyol, 1,4-cyclohexanedimethanol, 4,4'-diphenylmethane diisocyanate, and nano-magnesium hydroxide into the long diameter at a molar ratio of 1.03:0.97:2 In a reaction twin-screw with a ratio of 75, the reaction temperature is 120-190°C, the product is granulated under water, dried and packaged. Weight average molecula...

Embodiment 3

[0030] Under nitrogen protection, stir terephthalic acid: glutaric acid: 1,4-butanediol in a molar ratio of 55:55:75 at 60°C until uniform; , quickly raised the temperature to 100°C to start the reaction, raised the temperature to 240°C within 2 hours, and discharged the generated water to obtain a clear liquid; press the liquid into the polycondensation kettle, keep the temperature at 235°C, quickly depressurize to 30kPa, and keep the temperature constant Change, the pressure is gradually reduced to 100Pa within 1h, and the reaction is completed to obtain polyester polyol with a molecular weight of 2000Da.

[0031] Use a metering pump to mix polycarbonate polyol, 1,4-cyclohexanedimethanol and 1,4-butanediol mixture, 4,4'-diphenylmethane diisocyanate at a molar ratio of 1.03:0.97:2 , Nano-calcium carbonate is injected into the reaction twin-screw with an aspect ratio of 85, the reaction temperature is 120-190°C, the product is granulated under water, dried and packaged. Weigh...

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Abstract

The invention discloses a preparation method for polyurethane chip for high-temperature-resistant fibers. The preparation method is characterized in that the polyurethane chip is prepared by reacting the mixture of newly-synthesized aliphatic / aromatic hybrid polyester polyol and polyether polyol, aliphatic diol and diisocyanate in a double-screw extruder. The polyurethane chip has the characteristics of high molecular weight and narrow molecular weight distribution. Melt-spun polyurethane fibers produced by using the polyurethane chip prepared by the preparation method disclosed by the invention approach to or exceed over spandex produced by using a dry spinning process in performance.

Description

technical field [0001] The invention relates to a preparation method of a novel polyurethane chip for high temperature resistant fibers. Background technique [0002] As a high elastic fiber material, spandex has a wide range of uses in the textile industry. At present, spandex is mainly produced by two processes: dry spinning (dry spinning) and melt spinning (melt spinning), and the investment in melt spinning spandex equipment is low. The advantages of short production cycle, simple production process, high output, low cost, and especially no pollution have attracted people's attention, and it is known as green spandex internationally. [0003] Due to the high processing temperature of melt-spun spandex, compared with dry-spun spandex, the resilience and heat resistance are poorer. In order to improve the performance of melt-spun spandex, it is necessary to modify its upstream product—polyurethane chips to improve the performance of the final product. , Chinese patent app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08K3/36C08K3/22C08K3/26C08G18/73C08G18/66C08G18/44C08G63/183C08G63/181D01F6/94D01F1/10
Inventor 张春华
Owner 南通华盛高聚物科技股份有限公司
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