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Polyurethane prepolymer

A polyurethane prepolymer, polyester polyol technology, applied in the direction of polyurea/polyurethane coatings, polyurea/polyurethane adhesives, fasteners, etc., can solve the problem of insufficient adhesive strength, lack of moisture permeability of film, adhesion Insufficient strength and other problems, to achieve the effect of easy handling

Active Publication Date: 2011-08-31
DAINICHISEIKA COLOR & CHEM MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when coating on porous substrates such as fibers, the polyurethane prepolymer permeates into the substrate before curing, so the feel and elasticity of the porous substrate are impaired, and it is sticky when used in adhesives. The problem of reduced synergy
Furthermore, the film lacks moisture permeability, and when laminating substrates lacking moisture permeability, methods such as dot bonding (dot bonding) are used to impart moisture permeability, but there is a problem that the adhesive strength is insufficient.
[0003] Under the above circumstances, according to Japanese Patent Application Laid-Open No. 61-141777 (hereinafter referred to as "Patent Document 1"), a one-component adhesive including a polyurethane prepolymer using It is obtained by reacting polytetramethylene glycol with 4,4'-diphenylmethane diisocyanate. However, even with the above-mentioned polyurethane prepolymer, in addition to the resin properties, the adhesive strength is still insufficient, and the moisture permeability and hair growth cannot be satisfied. All quality properties required for adhesives such as foaming and hydrolysis resistance

Method used

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  • Polyurethane prepolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 610 parts of polypropylene glycol (number-average molecular weight: 2000, OH value: 56), and 1,4-butanediol and hexanediol 152 parts of difunctional polyester diol (number average molecular weight: 500, OH value: 235) formed by acid were heated and depressurized, and after dehydration treatment, nitrogen gas was introduced to make the internal temperature 90-100°C. 234 parts of 4,4'-methylene bis(phenylisocyanate) melted by heating beforehand were added, and it stirred at 100 degreeC for 2 hours, and it was made to react. After completion of the reaction, cool to below 40°C, add 3.0 parts of amine-based curing accelerator (1,8-diazabicyclo(5,4,0)-undecene), stir and mix, then take out.

[0046] The viscosity of the obtained polyurethane prepolymer was 950 dPa-s / 25°C. The NCO / OH equivalent ratio of this material was 1.54.

Embodiment 2

[0048] In a 2-liter glass reaction vessel equipped with a stirrer, a thermometer, a gas inlet, etc., a bifunctional polyether polyol (copolymerized polyether polyol of polytetramethylene glycol and polyethylene glycol, the number average molecular weight of 1800, OH value 62) 588 parts, and 159 parts of difunctional polyester diol formed from 1,4-butanediol and adipic acid (number average molecular weight 500, OH value 235), heat and reduce pressure , After the dehydration treatment, nitrogen gas is introduced to make the inner temperature 90-100°C. 176 parts of 2, 4- toluene diisocyanates were added, and it stirred and made it react at 100 degreeC for 2 hours. After completion of the reaction, cool to below 40°C, add 3.0 parts of amine-based curing accelerator (1,8-diazabicyclo(5,4,0)-undecene), stir and mix, then take out.

[0049] The viscosity of the obtained polyurethane prepolymer was 1050 dPa-s / 25°C. The NCO / OH equivalent ratio of this material was 1.57.

Embodiment 3

[0051] Into a 2-liter glass reaction vessel equipped with a stirrer, a thermometer, and a gas inlet, 797 parts of polypropylene glycol (number-average molecular weight: 2,000, OH value: 56), and 1,4-butanediol and 42 parts of difunctional polyester diol (number average molecular weight: 2000, OH value: 56) formed by acid were heated and depressurized, and after dehydration treatment, nitrogen gas was introduced to make the internal temperature 90-100°C. 157 parts of 4,4'-methylene bis(phenylisocyanate) melted by heating beforehand were added, and it stirred at 100 degreeC for 2 hours, and it was made to react. After completion of the reaction, cool to below 40°C, add 2.8 parts of amine-based curing accelerator (1,5-diazabicyclo(4,3,0)-nonene-5), stir and mix, then take out.

[0052] The viscosity of the obtained polyurethane prepolymer was 2020 dPa-s / 25°C. The NCO / OH equivalence ratio of this material was 1.50.

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Abstract

The invention provides a polyurethane prepolymer with moisture curing, which is in a liquid state at a normal temperature and will not soak towards the inner substrate. The polyurethane prepolymer has good elastic force and moisture permeability. Solvent-free polyurethane prepolymer is formed in a manner that polyether polyalcohol, polyester polyalcohol and polyisocyanates undergo a reaction with the equivalence ration of NCO / OH being 1.1-3.0 to contain amine curing catalyst of 0.01-5mass%. The mass ratio between the polyether polyalcohol and the polyester polyalcohol is arranged from 95 / 5 to 75 / 25. The main component of the polyether polyalcohol is polytetramethylene glycol-polyethylene glycol copolymer or polypropylene glycol.

Description

technical field [0001] The present invention relates to polyurethane prepolymers used in adhesives and the like. Specifically, it relates to a solvent-free polyurethane prepolymer that has fluidity at room temperature, solidifies while being foamed by moisture, and is excellent in moisture permeability. A coating method of the polyurethane prepolymer and an adhesive comprising the polyurethane prepolymer. Background technique [0002] Urethane prepolymers can be used in adhesives, coatings, and sealing materials. In particular, moisture-curable urethane prepolymers are cured by moisture in the air and can be used as a single liquid. In order to obtain adhesive strength, the structure of the resin is often solid at room temperature, and it is diluted with a solvent, or heated and melted with a melter or other device to form a liquid for coating. In addition, when coating on porous substrates such as fibers, the polyurethane prepolymer permeates into the substrate before curi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/12C09J175/06C09J175/08C09D175/06C09D175/08C09K3/10C08G101/00
CPCA43B7/26A43B17/16A43C7/06
Inventor 山田利树石田安希彦美细津岩雄
Owner DAINICHISEIKA COLOR & CHEM MFG CO LTD
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