Process for producing polyurethane elastomer and elastic filament

A technology of polyurethane elastomer and polyurethane elasticity, applied in the direction of one-component polyurethane rayon, one-component synthetic polymer rayon, textiles and papermaking

Inactive Publication Date: 2000-08-02
NISSHINBO IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elastomer produced by this method is an elastomer for melt spinning that is melted and spun, and a method for continuously reaction spinning raw materials such as polyols has not yet been published.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] With respect to 100 parts by weight of polyethylene adipate (molecular weight: 2,100) with hydroxyl groups at both ends, with a ratio of 24 parts by weight of diphenylmethane diisocyanate and 22 parts by weight of butanediol, at a reaction temperature of 115 ° C, the reaction Under the condition of a time of 60 minutes, the reaction was continued while stirring to obtain a prepolymer having a hydroxyl group at the end. The viscosity at 70°C of the hydroxyl-terminated prepolymer was 4,000 centipoise.

[0056] On the other hand, with respect to 200 parts by weight of polyethylene adipate (molecular weight: 2,100) with hydroxyl groups at both ends, at a reaction temperature of 115°C and a reaction time of 60 minutes at a ratio of 84 parts by weight of diphenylmethane diisocyanate, Under certain conditions, the reaction is carried out continuously while stirring to obtain a prepolymer with isocyanate at the end. This isocyanate-terminated prepolymer had a viscosity of 1,50...

example 2

[0078] With respect to 100 parts by weight of polyethylene adipate (molecular weight 2,100) with hydroxyl groups at both ends, use a ratio of 24 parts by weight of diphenylmethane diisocyanate under the conditions of a reaction temperature of 80°C and a reaction time of 60 minutes. They react to obtain a precursor, and then, use 33 parts by weight of butanediol and 124 parts by weight of the prepared precursor at a reaction temperature of 115°C and a reaction time of 60 minutes to continuously react while stirring to prepare A prepolymer with a hydroxyl group at the end is obtained. The viscosity at 70°C of the hydroxyl-terminated prepolymer was 5,000 centipoise.

[0079] On the other hand, using a ratio of 110 parts by weight of diphenylmethane diisocyanate to 200 parts by weight of polyethylene adipate (molecular weight: 2,100) with hydroxyl groups at both ends, at a reaction temperature of 80°C and a reaction time of 60 minutes, Under certain conditions, the reaction is co...

example 3

[0083] With respect to 100 parts by weight of polyethylene adipate (molecular weight: 2,100) having hydroxyl groups at both ends, a ratio of 24 parts by weight of diphenylmethane diisocyanate and 28 parts by weight of butanediol was obtained at a reaction temperature of 115°C. 1. Under the condition of a reaction time of 60 minutes, the reaction was continued while stirring to obtain a prepolymer with a hydroxyl group at the end.

[0084] The viscosity at 70°C of the hydroxyl-terminated prepolymer was 4,500 centipoise. On the other hand, at a ratio of 96 parts by weight of diphenylmethane diisocyanate to 200 parts by weight of polyethylene adipate (molecular weight: 2,100) with hydroxyl groups at both ends, at a reaction temperature of 115°C and a reaction time of Under the condition of 60 minutes, the reaction was continued while stirring to obtain a prepolymer with an isocyanate terminal. This isocyanate-terminated prepolymer had a viscosity of 1,800 centipoise at 70°C.

...

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PUM

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Abstract

A process for producing a polyurethane elastic material or polyurethane elastic yarn from a first polymer diol having a molecular weight of 600 or more, a second polymer diol having a molecular weight of 600 or more, a first low molecular weight diol having a molecular weight of 500 or less, a second low molecular weight diol, a first diisocyanate and a second diisocyanate as main starting materials, the total amount of the first diisocyanate and the second diisocyanate in the starting materials being 0.95 to 1.25 times the total molar amount of the first polymer diol, the second polymer diol, the first low molecular weight diol and the second low molecular weight diol, comprising the step of: extruding continuously extruding from a nozzle a polyurethane polymer in fluid state obtained by continuously reacting a prepolymer having hydroxyl-terminal obtained by reacting the first polymer diol, the first low molecular weight diol and the first diisocyanate, with a prepolymer having isocyanate-terminal obtained by reacting the second polymer diol, the second low molecular weight diol and the second diisocyanate.

Description

field of invention [0001] The present invention relates to a method for producing polyurethane elastomers, especially elastic filaments, by reaction spinning. Background of the invention [0002] It is well known that polyurethane elastomers can be produced by extrusion molding using thermoplastic polyurethane pellets made from polymer diols, diisocyanates and low molecular weight diols. However, when extruded by this method, due to the decomposition of some bonds in the polymer, it is impossible to obtain polyurethane elastomers with satisfactory thermal properties such as residual deformation after elongation in a high-temperature environment, especially good thermal properties. polyurethane elastic yarn. [0003] On the other hand, everyone knows that in order to improve the thermal properties of polyurethane elastic yarns obtained by melt spinning, there is also a one-step foaming method to polymerize polymer diols, diisocyanates, and low-molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/08C08G18/10C08G18/12C08G18/66D01F6/70
CPCC08G18/6674D01F6/70C08G18/10C08G18/0895C08G18/12C08G18/6607Y10S528/906C08G18/40
Inventor 提信寿田村健治吉本光彦
Owner NISSHINBO IND INC
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