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Rigid polyurethane foam and preparation method thereof

A technology of rigid polyurethane and hyperbranched polyurethane, which is applied in the field of polyurethane foam preparation, can solve problems such as difficulty in mixing uniformly, emission of volatile organic compounds, inhomogeneous rigid foam, etc., and achieve simple process, improved dimensional stability, and temperature resistance good sex effect

Inactive Publication Date: 2015-05-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, cross-linked polyols usually have a higher viscosity, which can significantly increase the viscosity of the polyol component, making it difficult to mix evenly with low-viscosity isocyanates, resulting in non-uniform rigid foams
Low-viscosity liquid VOCs have been used to reduce viscosity, but this can lead to emission of VOCs during foam preparation

Method used

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  • Rigid polyurethane foam and preparation method thereof
  • Rigid polyurethane foam and preparation method thereof
  • Rigid polyurethane foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, 6.7 parts by weight of trimethylolpropane and 33.3 parts by weight of isophorone diisocyanate are added to a three-necked flask, and then 0.05 parts by weight of organic bismuth catalyst (BiCAT 8108, leading in the United States) is added. , reacted in N-dimethylformamide for 1 hour; then added 60 parts by weight of trimethylolpropane to continue the reaction for 3 hours to obtain a hyperbranched polyurethane polyol with a solid content of 71% and a viscosity of 1100 mPa·s.

[0031] At 30°C, add 100 parts by weight of hyperbranched polyurethane polyol, 8.5 parts by weight of water, and 4 parts by weight of organosiloxane (B8433, Degussa) into a self-made mold and stir for 30 seconds. After mixing evenly, quickly add 180 parts by weight Polymethylene polyphenyl polyisocyanate (PM-200, Yantai Wanhua), after stirring for 3 minutes, was placed in an oven at 60° C. for curing for 24 hours to prepare the rigid polyurethane foam.

[0032] The performance test of rigid p...

Embodiment 2

[0036] First, 6.7 parts by weight of trimethylolpropane and 40 parts by weight of isophorone diisocyanate were added to a three-necked flask, then 0.10 parts by weight of dibutyltin dilaurate was added, and 40 parts by weight of N,N-dimethyl and then added 40 parts of trimethylolpropane to continue the reaction for 4 hours to obtain a hyperbranched polyurethane polyol with a solid content of 68% and a viscosity of 960 mPa·s.

[0037] At 30°C, add 100 parts by weight of hyperbranched polyurethane polyol, 8.5 parts by weight of water, and 2.8 parts by weight of organosiloxane (AK8805, Demei Shichuang) into a self-made mold and stir for 30 seconds. After mixing evenly, quickly add 140 parts by weight Polymethylene polyphenyl polyisocyanate (PM-200, Yantai Wanhua), after stirring for 3 minutes, was placed in an oven at 40° C. for curing for 48 hours to prepare the rigid polyurethane foam.

[0038] The performance test of rigid polyurethane foam was carried out, and the results are...

Embodiment 3

[0043] First, 6.7 parts by weight of trimethylolpropane and 50 parts by weight of isophorone diisocyanate are added to a three-necked flask, and then 0.15 parts by weight of organic bismuth catalyst (BiCAT 8118, leading in the United States) is added. , reacted in N-dimethylformamide for 2 hours; then added 45 parts by weight of trimethylolpropane to continue the reaction for 4 hours to obtain a hyperbranched polyurethane polyol with a solid content of 70% and a viscosity of 1050 mPa·s.

[0044] At 30°C, add 100 parts by weight of hyperbranched polyurethane polyol, 8.5 parts by weight of water, and 4 parts by weight of organosiloxane (B8450, Degussa) into a self-made mold and stir for 30 seconds. After mixing evenly, quickly add 240 parts by weight Polymethylene polyphenyl polyisocyanate (5005, Huntsman) was stirred for 3 minutes, and then put into an oven at 80° C. for 12 hours to cure to prepare the rigid polyurethane foam.

[0045] The performance test of rigid polyurethane...

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Abstract

The invention discloses a rigid polyurethane foam and a preparation method thereof. The preparation method of the rigid polyurethane foam comprises the following steps: premixing 100 parts by weight of hyperbranched polyurethane polyol with 1-10 parts by weight of foam stabilizer, adding 100-250 parts by weight of organic isocyanate or modified isocyanate to the pre-mixture and then curing at 30-100 DEG C for 12 hours to 3 days, thus obtaining the rigid polyurethane foam, wherein the hyperbranched polyurethane polyol is prepared by use of the following steps: reacting a polyhydroxylated compound with a diisocyanate monomer to obtain a first-generation hyperbranched prepolymer; on the basis of the isocyanate group content of the first generation hyperbranched prepolymer, adding the polyhydroxylated compound again and reacting to obtain the hyperbranched polyurethane polyol. The rigid polyurethane foam prepared by use of the method is high in strength, good in temperature resistance, good in dimensional stability and low in heat conductivity coefficient, and can be applied to the fields of thermal insulation, gap filling and supporting, wood-imitation materials and the like.

Description

technical field [0001] The invention relates to the field of polyurethane foam preparation, in particular to a method for preparing rigid polyurethane foam with hyperbranched polyurethane polyol as one of the components. Background technique [0002] Polyurethane foam usually has three preparation methods, namely prepolymer method, semi-prepolymer method and one-step method. The prepolymer method reacts isocyanate and polyol (polyether or polyester polyol) to form a prepolymer, and then adds water, (prepolymer) catalyst, surfactant, etc. to the prepolymer to make water and isocyanate groups The reaction is carried out, and the chain is extended while foaming (sometimes there is a partial cross-linking reaction) to form a polymer compound. The method involves a simple reaction, but a complex process. The semi-prepolymer method is to react a part of polyether or polyester polyol with all the isocyanate in the formulation to form a prepolymer mixture of oligomers with isocyan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/64C08G18/10C08G18/75C08G18/32C08J9/08C08G101/00
CPCC08G18/3206C08G18/755C08G18/7664C08G18/8025C08G2110/0025C08G2110/0083
Inventor 罗玉梅叶仲斌刘丽李雯陈康云
Owner SOUTHWEST PETROLEUM UNIV
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