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Production method of polyurethane elastic fibers

A polyurethane elasticity and production method technology, applied in the direction of fiber chemical characteristics, single-component synthetic polymer rayon, textiles and papermaking, etc., can solve the problems of health damage to operators, large equipment investment, complex production process, etc.

Inactive Publication Date: 2016-10-26
张勇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, both the chemical method and the wet method have been eliminated, leaving only the dry method and the melting method. Due to the dry method of producing spandex, the production process is complicated, the equipment investment is large, and the production cost is high. In addition, the most important thing is to use the organic solvent dimethyl Formamide (DMF) and dimethylacetamide (DMAc) are highly toxic, causing serious pollution to the environment and damage to the health of operators. These factors have restricted the production of spandex by dry method

Method used

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  • Production method of polyurethane elastic fibers
  • Production method of polyurethane elastic fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the formula ratio in Table 1, first select polyadipate-1,4-butylene glycol ester diol (PBA), phenylmethane diisocyanate (MDI) (heated to 70°C) and 1,4-butanediol (BDO ) (heated to 80°C) to keep each component in a molten state, and an antioxidant (2,6-di-tert-butyl-p-cresol (BHT with a mass ratio of 1:1:1) ), the mixture of antioxidant 1010 and antioxidant 168), carbodiimide and E wax, the mass ratio of the antioxidant, carbodiimide and E wax to component a is 0.3:1000 (antioxidant Oxygen agent: a component = 0.3:1000, carbodiimide: a component = 0.3:1000, E wax: a component = 0.3:1000); after being accurately metered by the metering system, it continuously enters the barrel temperature distribution The double Screw extruder (95 mm diameter, length-to-diameter ratio L / D is 64) mixed for 8 minutes, and at a speed of 100 rpm, carried out bulk melt polymerization, after extrusion, introduced into water, and carried out underwater granulation , so that the po...

Embodiment 2

[0031] First select polytetrahydrofuran (PTMG), phenylmethane diisocyanate (MDI) (heated to 70°C), 1,4-butanediol (BDO) (heated to 80°C) according to the formula ratio in Table 2, so that each component is in In molten state, add antioxidant (2,6-di-tert-butyl p-cresol (BHT) with a mass ratio of 1:1:1:1, antioxidant 1010, antioxidant 168) during the melting process of component a , the mixture of antioxidant 245), carbodiimide and E wax, the mass ratio of the antioxidant, carbodiimide and E wax to component a is 0.05:1000; after being accurately metered by the metering system, Continuously entering the barrel temperature distribution is 180°C, 180°C, 190°C, 190°C, 190°C, 200°C, 200°C, 220°C, 220°C, 235°C, 235°C, 200°C, 200°C, 190°C, 190°C, 190°C twin-screw extruder (95 mm diameter, length-to-diameter ratio L / D is 64) mixed for 8 minutes, and carried out bulk melt polymerization at a speed of 100 rpm, after extrusion, into In water, carry out underwater granulation, so as to o...

Embodiment 3

[0035] First select polytetrahydrofuran (PTMG) and polyadipate-1,4-butylene glycol ester diol (PBA) according to the formula ratio of the following table 3, phenylmethane diisocyanate (MDI) (heated to 70 ° C), 1, 4-butanediol (BDO) (heated to 80°C), make each component in a molten state, add antioxidant (2,6-di-tert-butyl with a mass ratio of 1:1) during the melting process of component a The mixture of p-cresol (BHT) and antioxidant 1010), carbodiimide and E wax, and described antioxidant is 2,6-di-tert-butyl p-cresol (BHT), antioxidant 1010, antioxidant The mixture of at least two kinds of antioxidant 168 and antioxidant 245, the mass ratio of the antioxidant, carbodiimide and E wax to component a is 0.1:1000; after being accurately metered by the metering system, it is continuously fed into The barrel temperature distribution is 180°C, 180°C, 190°C, 190°C, 190°C, 200°C, 200°C, 220°C, 220°C, 235°C, 235°C, 200°C, 200°C, 190°C, 190°C, 190°C twin-screw extruder (95 mm diameter...

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Abstract

The invention provides a production method of polyurethane elastic fibers. The production method is characterized by adopting polyester polyol or polyether polyol or a mixture of polyester polyol and polyether polyol, organic diisocyanate and a small molecule chain extender, enabling the components to enter a twin-screw extruder with great enough length-diameter ratio and precision of temperature control in a range of + / -1 DEG C viprecise measuring system, generating a pure linear polyurethane elastomer by a one-step method in a temperature range of 180-240 DEG and then carrying out melt spinning by spinning equipment, thus generating the polyurethane elastic fibers. The polyurethane elastic fibers produced by the method are green and environmentally friendly and have good spinning stability, heat resistance, elastic recovery properties, elongation and filament uniformity.

Description

technical field [0001] The invention relates to a production method of polyurethane elastic fiber. Background technique [0002] Polyurethane elastic fiber is called spandex in our country, and it is usually divided into polyester type and polyether type. There are four methods for producing spandex in the world, namely dry method, wet method, chemical method and melting method. At present, both the chemical method and the wet method have been eliminated, leaving only the dry method and the melting method. Due to the dry method of producing spandex, the production process is complicated, the equipment investment is large, and the production cost is high. In addition, the most important thing is to use the organic solvent dimethyl Formamide (DMF) and dimethylacetamide (DMAc) are highly toxic, causing serious pollution to the environment and damage to the health of workers. These factors have restricted the production of spandex by dry method. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/94C08G18/32C08G18/42C08G18/48C08G18/66
CPCD01F6/94C08G18/3206C08G18/4018C08G18/4238C08G18/4854C08G18/664C08G18/6674
Inventor 张勇
Owner 张勇
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