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Process for manufacturing thermoplastic urethane (TPU) by utilizing waste spandex fiber

A technology of thermoplastic polyurethane and spandex waste silk, which is applied in the technical field of manufacturing thermoplastic polyurethane TPU, can solve the problems such as unclear instructions for manufacturing thermoplastic polyurethane TPU and degradation agent G, and the inability to implement spandex waste silk, etc., so as to achieve simple operation process and Economic and environmental benefits, low cost effect

Inactive Publication Date: 2011-10-19
SHANGHAI LIANJING MATERIAL ASSETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 200910048629.2 discloses a process for producing thermoplastic polyurethane TPU using spandex waste silk, but the description of degradation agent G is unclear, and the process for producing thermoplastic polyurethane TPU using spandex waste silk cannot be implemented according to the content recorded in the manual

Method used

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  • Process for manufacturing thermoplastic urethane (TPU) by utilizing waste spandex fiber
  • Process for manufacturing thermoplastic urethane (TPU) by utilizing waste spandex fiber
  • Process for manufacturing thermoplastic urethane (TPU) by utilizing waste spandex fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Select the following formula: spandex waste silk 50%, degradation agent G 0.52%, small molecule polyol E 1 1,4-Butanediol BDO 49.48%.

[0031] The following process steps are adopted: (1) select spandex waste silk, cut it into a thickness less than 1 cm, and then put it in an iron frame and put it in a 70°C blast high-dry oven for 8 hours, (2) add BDO to the reaction kettle , stirred, nitrogen gas was introduced at a speed of 5 L / min, and the temperature began to rise after 10 minutes. When the temperature reached 80°C, waste silk was added. Pay attention to the change of current, if the current is too high, stop adding waste silk, and add degradation agent after the temperature rises. When the temperature is 120°C, add degradation agent G for the first time, lock the lid, heat up and degrade for 30 minutes, then add waste silk again, and add degradation agent G for the second time after adding waste silk. Maintain the temperature at 140-150°C for 90 minutes to degra...

Embodiment 2

[0033] Select the following formula: spandex waste silk 45%, degradation agent G 1.2%, thinner T (low molecular polyether polyol) 42.8%, small molecule polyol E 1 1,4-Butanediol BDO 11%.

[0034] The following process steps are adopted: (1) select the spandex waste silk, cut it into a thickness less than 1 cm, and then put it in an iron frame and put it in a 70°C high-air blast oven for drying for 8 hours; (2) mix BDO and thinner T is added to the reactor, then stirred and nitrogen gas is introduced at a speed of 5L / min, and the temperature starts to rise after 10 minutes. When the temperature reaches 80°C, add waste silk. When the temperature is 120°C, add degradation agent G for the first time and lock it. After the lid is degraded at 150°C for 30 minutes, waste silk is added. After the waste silk is added, the degradation agent G is added for the second time. Maintain the temperature at 140-150°C for 120 minutes and degrade for 120 minutes. (3) When sampling and measuring ...

Embodiment 3

[0036] Select the following formula: spandex waste silk 65%, degradation agent G 3%, thinner T (containing carbonyl compound) 25%, small molecule polyol E11, 4-butanediol BDO 7%.

[0037] The following process steps are adopted: (1) select the spandex waste silk, cut it into a thickness less than 1 cm, and then put it in an iron frame and put it in a 70°C high-air blast oven for drying for 8 hours; (2) mix BDO and thinner T is added to the reactor, then stirred and nitrogen gas is introduced at a speed of 5L / min, and the temperature starts to rise after 10 minutes. When the temperature reaches 80°C, add waste silk. When the temperature is 120°C, add degradation agent G for the first time and lock it. After the lid is degraded at 135°C for 30 minutes, then add waste silk. After the waste silk is added, add degradation agent G for the second time. Maintain the temperature at 130-140°C for 90 minutes, then degrade at 110°C, vacuum negative pressure 0.98MPa, pump for 20 minutes, (...

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Abstract

The invention relates to the technical field of reutilizing waste spandex, in particular to a process for manufacturing thermoplastic urethane (TPU) by utilizing waste spandex fiber. The process is characterized by comprises the steps of: waste spandex fiber degradation step and TPU synthesis step, the degradation step comprises pretreatment and degradation reaction, and the TPU synthesis step comprises synthesis reaction and posttreatment. The process method can recover and transform the waste spandex fiber into TPU, is simple in operation steps, can solve the problem of environmental pollution due to generation of waste fiber during production process, has low production cost and excellent product performance, as well as better economic benefits and environment-friendly benefits, and simultaneously develop a new approach for recycling of waste spandex fiber.

Description

[technical field] [0001] The invention relates to the technical field of recycling waste spandex yarns, in particular to a process for manufacturing thermoplastic polyurethane TPU by using waste spandex yarns. [Background technique] [0002] Spandex (commonly known as PU elastic fiber) is a fiber with high elasticity and stretchability. Its tensile strength, tensile stress, abrasion resistance, aging resistance and chemical resistance are better than rubber. It is now widely used by textile industry to make textiles. At present, in the production process of chemical fiber, textile and other enterprises, a large amount of waste leftovers and scraps are produced. How to properly recycle spandex waste silk has become an urgent issue related to sustainable development. The recycling of spandex waste mainly includes energy recovery methods, physical recovery methods and chemical recovery methods. However, there are relatively few researches in this area at home and abroad. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/42C08G18/08
Inventor 谢国龙詹国胜
Owner SHANGHAI LIANJING MATERIAL ASSETAB
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