Low-hardness thermosetting polyurethane elastomer and production method thereof
A polyurethane elastomer, thermosetting technology, applied in the field of thermosetting polyurethane elastomers, can solve the problems of differential molding, low speed, exudation, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0085] Isocyanate-terminated prepolymer F was prepared by reacting 150 parts of 4,4'-diphenylmethane diisocyanate with 850 parts of polyol A at 90° C. for 30 hours under a dry nitrogen atmosphere, followed by cooling. The resulting isocyanate-terminated prepolymer had an NCO content of 4.0% and a viscosity of 9,700 mPa.s / 25°C.
[0086] The curing agent was prepared by blending 10 parts Polyol C, 90 parts Polyol D, and 0.02 parts DBU Octylate.
[0087] 54 parts of prepolymer F controlled at 70°C and 100.02 parts of curing agent (the equivalent ratio of NCO group and hydroxyl group of the curing agent is 1.03) controlled at 25°C were mixed for 1 minute with a propeller mixer, and then poured into the In a hot metal mold at 80°C, and cured in a heating oven for 30 minutes and demolded. The pot life of the mixture is 5 minutes. The release molding was heated at 80° C. for 10 hours. In addition, after the mold was post-cured for 7 days in an atmosphere of 25° C. and 60% RH, the ...
Embodiment 2
[0089]In the same manner as in Example 1, isocyanate group-terminated prepolymer G was prepared by reacting 142 parts of 4,4'-diphenylmethane diisocyanate with 858 parts of polyol B. The obtained isocyanate-terminated prepolymer G had an NCO content of 4.0% and a viscosity of 15,000 mPa.s / 25°C.
[0090] A molded article was obtained in the same manner as in Example 1 except that Prepolymer G was used. The pot life of the mixture is 5 minutes. Table 3 shows the measurement results of physical properties of the obtained molded articles. JIS A hardness was 28 and compression set was 1.0%. In addition, the molded article showed no exudation. All the physical properties of the molded article reached the target.
Embodiment 3
[0092] In the same manner as in Example 1, an isocyanate group-terminated prepolymer was prepared by reacting 155.3 parts of polymethylene polyphenylisocyanate containing 65% by weight of 4,4'-diphenylmethane diisocyanate with 844.7 parts of polyol A. Object H. The resulting isocyanate-terminated prepolymer had an NCO content of 4.0% and a viscosity of 15,000 mPa.s / 25°C.
[0093] A molded article was obtained in the same manner as in Example 1 except that Prepolymer H was used. The pot life of the mixture is 5 minutes. Table 3 shows the measurement results of physical properties of the obtained moldings. JIS A hardness was 33 and compression set was 1.0%. The molded article showed no bleeding. All the physical properties of the molded article reached the target.
PUM
Property | Measurement | Unit |
---|---|---|
degree of unsaturation | aaaaa | aaaaa |
hardness | aaaaa | aaaaa |
hardness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap