A method for preparing polyurethane elastic fiber by mixing polyols

A technology of mixing polyols and polyurethane elasticity, which is applied in the manufacture of polyurethane elastic fibers and new polyurethane elastic fibers. It can solve problems such as weaving interruption, efficiency reduction, and cloth evenness, so as to reduce manufacturing costs and improve strength and toughness. Effect

Active Publication Date: 2016-08-24
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the weaving process, polyurethane elastic fibers generally need to be drawn by a certain number of times. At the same time, they are constantly rubbed against the machine. Due to the low strength of the spandex yarn, it is easy to break the yarn, which will cause weaving interruption, lower efficiency, and strips on the cloth. dry phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Under the conditions of nitrogen atmosphere, 70°C and stirring, phthalic anhydride polyester polyol (320mgKOH / g), polyethylene glycol (molecular weight: 600g / mol), polytetramethylene ether glycol (the molar ratio is 2: 1:10) was reacted with 4,4 diphenylmethane diisocyanate for 120 minutes to obtain an isocyanate-terminated prepolymer. After cooling to 40°C, dimethylacetamide was added to fully dissolve to obtain a prepolymer solution. Subsequently, ethylenediamine and diethylamine are dissolved in dimethylacetamide, and then added to the previous prepolymer solution to prepare a polyurethaneurea solution.

[0019] The solid additive added in the prepared polyurethane urea solution comprises 0.3% of anti-ultraviolet agent, 1.0% of antioxidant, 0.5% of anti-yellowing agent, 0.6% of dyeing auxiliaries, and 0.3% of anti-sticking agent. Then the mixed solution is dry-spun to produce 40D polyurethane elastic fiber.

Embodiment 2

[0021] Under the conditions of nitrogen atmosphere, 70°C and stirring, phthalic anhydride polyester polyol (350mgKOH / g), polyethylene glycol (molecular weight: 500g / mol), polytetramethylene ether glycol (molar ratio is 3: 1:15) was reacted with 4,4 diphenylmethane diisocyanate for 120 minutes to obtain an isocyanate-terminated prepolymer. After cooling to 40°C, dimethylacetamide was added to fully dissolve to obtain a prepolymer solution. Subsequently, ethylenediamine and diethylamine are dissolved in dimethylacetamide, and then added to the previous prepolymer solution to prepare a polyurethaneurea solution.

[0022] According to Example 1, various auxiliary agents were added and spun to prepare 40D polyurethane elastic fibers.

Embodiment 3

[0024] Under the conditions of nitrogen atmosphere, 70°C and stirring, phthalic anhydride polyester polyol (380mgKOH / g), polyethylene glycol (molecular weight 400g / mol), polytetramethylene ether glycol (molar ratio is 3: 2:12) was reacted with 4,4 diphenylmethane diisocyanate for 120 minutes to obtain an isocyanate-terminated prepolymer. After cooling to 40°C, dimethylacetamide was added to fully dissolve to obtain a prepolymer solution. Subsequently, ethylenediamine and diethylamine are dissolved in dimethylacetamide, and then added to the previous prepolymer solution to prepare a polyurethaneurea solution.

[0025] According to Example 1, various auxiliary agents were added and spun to prepare 40D polyurethane elastic fibers.

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Abstract

The invention discloses a method for preparing polyurethane elastic fibers through mixed polyol. The method comprises the following steps: 1) mixing diethylene glycol phthalic anhydride polymer, polytetramethylene ether glycol and polyethylene glycol so as to form the mixed polyol, and adding diisocyanate into the mixed polyol to form a prepolymer; 2) dissolving the prepolymer into dimethylacetamide or dimethylformamide to react with monamine and furadiamine substances to generate a polyurethane urea stock solution, and adding an antioxidant, an anti-ultraviolet agent and a yellowing-resistant agent into the polyurethane urea stock solution, storing, curing and preparing into a spinning solution; 3) performing dry spinning so as to obtain polyurethane elastic fibers. The strength and toughness of the polyurethane elastic fibers prepared through the method are superior to other general products.

Description

technical field [0001] The invention relates to a method for manufacturing novel polyurethane elastic fibers, in particular to a method for manufacturing polyurethane elastic fibers with superior strength and toughness, and belongs to the technical field of polyurethane elastic fibers. Background technique [0002] Polyurethane elastic fiber is characterized by its high elasticity, and is currently a widely used chemical fiber, and it is constantly expanding to new fields. The force required to stretch the fiber to break is called the breaking force. During the weaving process, polyurethane elastic fibers generally need to be drawn by a certain number of times. At the same time, they are constantly rubbed against the machine. Due to the low strength of spandex yarn, it is easy to break the yarn, which will cause weaving interruption, lower efficiency, and strips on the cloth. dry phenomenon. In order to improve the strength and toughness of spandex yarn, the applicant made...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): D01F6/70C08G18/66C08G18/42C08G18/48C08G18/12
Inventor刘亚辉陈铃毛植森周志伟席青
OwnerZHEJIANG HUAFENG SPANDEX