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Heat-curable polyurethane resin composition and urethane elastomer molded article using the same

A polyurethane resin and polyurethane prepolymer technology, which is applied in the field of polyurethane elastomer moldings, can solve the problems of deterioration of compression set resistance, difficulty in obtaining flame-retardant and low-hardness polyurethane elastomer moldings, etc., and achieve compression resistance Excellent permanent deformation effect

Inactive Publication Date: 2012-02-01
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is known that when a flame retardant is blended, the compression set resistance deteriorates, and it is difficult to obtain a polyurethane elastomer molded product that achieves the three physical properties of compression set resistance, flame retardancy, and low hardness.

Method used

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  • Heat-curable polyurethane resin composition and urethane elastomer molded article using the same
  • Heat-curable polyurethane resin composition and urethane elastomer molded article using the same

Examples

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Embodiment

[0070] Hereinafter, the present invention will be explained in more detail through examples, but the scope of the present invention is not limited to these examples.

[0071] In addition, in the present invention, unless otherwise specified, "parts" are "parts by mass" and "%" are "mass%".

Synthetic example 1

[0072] Synthesis Example 1 Synthesis of polyurethane prepolymer (D-1) with blocked isocyanate groups

[0073] While stirring vigorously, add 74 parts of 2,4-toluene diisocyanate (NCO / OH = 1.7) to 500 parts of polytetramethylene ether glycol ("PTMG-2000" manufactured by Mitsubishi Chemical Corporation, number average molecular weight 2000) ), react at 100°C for 4 hours to obtain a polyurethane prepolymer.

[0074] This polyurethane prepolymer was cooled to 60°C, 31 parts of methyl ethyl ketoxime as a blocking agent was put into it, stirred at 70°C for 2 hours and reacted, thereby obtaining a polyurethane prepolymer with blocked isocyanate groups (D-1) . The obtained isocyanate group blocked polyurethane prepolymer (D-1) had a viscosity of 3800 mPa·s at 80°C.

Synthetic example 2

[0075] Synthesis Example 2 Synthesis of polyurethane prepolymer (D-2) with blocked isocyanate groups

[0076] While vigorously stirring, into 500 parts of liquid polyester diol (polyester diol obtained from 3-methylpentanediol and adipic acid, molecular weight 2000) was added 74 parts of 2,4-toluene diisocyanate (NCO / OH=1.7) and reacted at 100°C for 4 hours to obtain a polyurethane prepolymer.

[0077] This polyurethane prepolymer was cooled to 60°C, 31 parts of methyl ethyl ketoxime as a blocking agent was put into it, stirred at 70°C for 2 hours and reacted, thereby obtaining a polyurethane prepolymer with blocked isocyanate groups (D-2) . The obtained polyurethane prepolymer (D-2) in which the isocyanate group was blocked had a viscosity at 80°C of 4200 mPa·s.

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Abstract

The invention aims at providing a heat-curable polyurethane resin composition and a urethane elastomer molded article using the same advantaged by excellent compression set resistance performance and low hardness. The invention relates to a heat-curable polyurethane resin composition and a urethane elastomer molded article using the same, which are characterized in that, the heat-curable polyurethane resin composition comprises a polyurethane prepolymer (1) with an isocyanate group terminated and a triamine with an amine equivalent of 50-350, the polyurethane prepolymer is obtained via polyhydric alcohol (A), polyisocyanates (B), and terminating agents (C) as necessary raw materials.

Description

Technical field [0001] The present invention relates to a thermosetting polyurethane resin composition and a polyurethane elastomer molded product formed using the same. The thermosetting polyurethane resin composition can be particularly suitably used as a hard plastic coating material and has excellent compression set resistance and low hardness . Background technique [0002] Molded products using thermosetting polyurethane elastomers have excellent mechanical strength and wear resistance, so they are used in various industrial parts such as rollers, automobile parts, and electronic equipment parts. [0003] The thermosetting polyurethane elastomer is usually obtained as follows: the isocyanate group-terminated polyurethane prepolymer and a compound having two or more active hydrogen groups such as amino or hydroxyl groups as a curing agent are mixed, defoamed, and injected into a mold at room temperature or under heating. Carbamate / urea-based chain extension reaction and allop...

Claims

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Application Information

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IPC IPC(8): C08G18/80C08G18/50C08G18/10C08L75/04C08L75/08
CPCC08G18/10C08G18/3225C08G18/42C08G18/48C08G18/7621C08J5/00C08K5/33C08K2201/005C08L75/04
Inventor 中村昭文须崎弘
Owner DAINIPPON INK & CHEM INC
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