KR970001398A - Rigid Urethane Foam for Structural Materials - Google Patents

Abstract

The present invention relates to a rigid urethane foam for structural materials used as a substitute for natural wood in building materials and industrial materials, the conventional rigid urethane foam is inferior in mechanical properties such as bending strength, compressive strength, tensile strength, etc. It solves the problem of hardly showing the fibrous characteristics of wood.

That is, in the present invention, a low molecular weight polyether polyol and an excess of isocyanate are first reacted to prepare an isocyanate terminal urethane prepolymer having an NCO% of 15 to 28%, and then again a polyether polyol and a polyester polyol. The present invention relates to a rigid urethane foam for structural materials prepared by mixing and foaming a polyol mixture comprising a polyol and an additive such as a crosslinking agent, a catalyst, a surfactant, a foaming agent, and a flame retardant, wherein the rigid urethane foam prepared according to the present invention has a mechanical property. This enhanced and more fibrous nature of wood makes it possible to use as a substitute for natural wood as a structural material because it does not break or break even in nail or screw work.

Description

Rigid Urethane Foam for Structural Materials

Since this is an open matter, no full text was included.

Claims (10)

5 to 95 wt% of polyether polyol and 5 to 95 wt% of polyester polyol based on 100 parts by weight of a prepolymer prepared by reacting an excess of isocyanate such that polyether polyol and / or polyester polyol and NCo% are 15 to 28%. 50 to 150 parts by weight of polyol mixed with%, 1 to 10 parts by weight of crosslinking agent, 0.1 to 5 parts by weight of surfactant, 0.1 to 3 parts by weight of catalyst selected from amines and organometallic compounds, chlorofluorocarbon, hydrochlorofluorocarbon , A polyol mixture composed of 3 to 30 parts by weight of a blowing agent selected from methylene chloride, water, dicyclic carbon (CO ₂ ), cyclopentane, 2 to 20 parts by weight of a flame retardant, and other additives, and is prepared by foaming reaction. Rigid urethane foam for structural materials. The polyether polyol according to claim 1, wherein the polyether polyol is selected from among ethylene glycol, propylene glycol, glycerin, trimethylol propane, methylglycoside, ethylenediamine, toluene diamine, diethyltriamine, sorbitol, SUCROSE, and Mannich base. A rigid urethane foam for structural materials, wherein the hydroxyl group produced by addition polymerization of one or two or more selected compounds in the presence of an initiator is a polyether polyol having a range of 100 to 100 mgKOH / g and an average molecular weight of 200 to 1200. The method of claim 1, wherein the polyester-based polyol is ethylene glycol, propylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-pentanediol, 3-methyl-1,5-pentanediol, 1, Diol selected from 6-hexanediol, neopentyl glycol, diethylene glycol, trimethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, bishydroxydiethoxy benzene, 1,4-dichloronucleic acid diol, bisphenol A; Prepared by polycondensation of a polyacid selected from adipic acid, azelaic acid, sebacic acid, maleic acid, 1,3-dichlorohexanedicarbonyl acid, tetraphthalic acid, isophthalic acid, phthalic acid A rigid urethane foam for structural materials, wherein the hydroxyl group is a polyester-based polyol having a range of 100 to 500 mgKOH / g and an average molecular weight of 200 to 1000. The crosslinking agent of claim 1, wherein the crosslinking agent is ethylene glycol, propylene glycol, dipropylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 200, polyethylene glycol 400, 1,5-pentanediol, 1,4-butanediol, polypropylene glycol A rigid urethane foam for structural materials, characterized in that one selected from lycon 400, m-phenylenediamine, diethyltoluenediamine, dimethylthiotoluenediamine, water, diethanolamine, triethanolamine, and glycerol. The isocyanate of claim 1, wherein the isocyanate is polymerized MDI (polymethylenepolyphenylisocyanate), 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 1,5-di Naphthalene diisocyanate, 4,6-xylene diisocyanate, paraphenylene diisocyanate, 3,3'-dimethyldiphenylmethane, 4,4-diisocyanate, 1,6-hexamethylene diisocyanate, 4,4'-dicyclo Hexyl methane diisocyanate, 3-isocyanatomethyl-3, 5,5-trimethylcyclohexyl isocyanate, 1,4-cyclohexyl diisocyanate and other polyols and modified MDI modified with crosslinking agent or modified polymerized MDI Hard urethane foam for structural material The amine catalyst of claim 1 is 1,4-diazabicyclo (2,2,2) octane, n, n-dimethylaminoethanol, n, n-dimethylcyclohexylamine, bis- (2-dimetalaminoethyl Ether, dimethylbenzylamine, dimethylcetylamine, n-methylmorpholine, n-ethylmorpholine, n, n, n ', n', n ″ -pentamethyldiethylenetriamine, 1,4-bis (2 -Hydroxypropyl) -2-methyl-piperazine, methylene-bis-dimethylcyclohexylamine, 1- (2-hydroxypropyl) imidazole, n, n'-dimethylpiperazine, n, n, n'- Hard urethane foam for structural materials, characterized in that selected from trimethylaminoethylethanolamine. The organometallic compound catalyst according to claim 1, wherein the organometallic compound catalyst is stenos octoate, stenos oleate, dibutyl tin dilaurate, dibutyl tin diacetate, dialkyl tin mercaptide, dialkyl tin thiesters, phenyl mercury propio Hard urethane foam for structural materials, characterized in that selected from Nate-, Lidoctoate, CH ₃ COOK, K ₂ , CO ₃ , NaHCO ₃ , Na ₂ CO ₃ , CaCO ₃ . The hard urethane foam for structural materials according to claim 1, wherein a polydimethylsiloxane polyalkylene dioxide block copolymer is used as the surface active agent. The flame retardant of claim 1, wherein the flame retardant is tris (2-chloropropyl) phosphate, tris (2-chloroethyl) phosphate, tris (2,3-dichloropropyl) phosphate, dimethylphenylphosphate, tetrakis (2-chloroethyl) A rigid urethane foam for structural materials, characterized by using one selected from -2,2-bis- (chloromethyl) propylene phosphate. The method of claim 1, wherein the blowing agent is selected from chlorofluorocarbon (CFC), hydrochlorofluorocarbon (HCFC), methylene chloride, water, carbon dioxide (CO ₂ ), cyclopentane, hard for structural materials Urethane foam. ※ Note: The disclosure is based on the initial application.