发明名称 |
SCHAEUMBARE PHENOLISCHE RESOL-ZUSAMMENSETZUNG UND VERFAHREN ZUR HERSTELLUNG PHENOLISCHER SCHAEUME |
摘要 |
Closed-cell phenolic foam having a uniform cell structure in which the cell walls are substantially free of both ruptures and perforations is disclosed. The phenolic foam has initial k values of less than 0.15 with substantially no increase of k value over time and good density and compressive strengths. The phenolic foam is prepared by foaming and curing a foamable phenolic resole composition containing an aqueous phenol formaldehyde resole, surfactant, fluorocarbon blowing agent, and optionally other additives with an acid foaming and curing catalyst in a substantially closed mold which exerts a restraining pressure on the foaming composition in excess of ambient atmosphericpressure of greater than about 3 pounds per square inch. The aqueous phenol formaldehyde resole is essentially a phenol formaldehyde condensation polymer having a molar ratio of formaldehyde to phenol of from about 1.7:1 to 2.3:1, preferably from 1.75:1 to 2.25:1 and most preferably about 2:1. The resole has a weight average molecular weight greater than 800 and preferably from 950-1500. The resole also has a number average molecular weight greater than about 350 and preferably from about 400 to about 600 and a dispersivity greater than about 1.7, preferably from 1.8 to 2.6. The acid foaming and curing catalyst is an anhydrous aryl sulfonic acid having a pKa less than about 2.0 and which changes the compatibility of the phenolic resole with water. The preferred anhydrous aryl sulfonic acid is a combination of toluene sulfonic acid and xylene sulfonic acid. |
申请公布号 |
DE3324433(A1) |
申请公布日期 |
1984.01.12 |
申请号 |
DE19833324433 |
申请日期 |
1983.07.07 |
申请人 |
KOPPERS CO.,INC. |
发明人 |
DAVID CARLSON,JOHN;WILLIAM KIFER,EDWARD;JOHN WOJTYNA,VINCENT;PAUL COLTON,JAMES |
分类号 |
C08J9/04;C08J9/14;C08K5/42;C08L61/00;C08L61/04;C08L61/06;C08L61/10 |
主分类号 |
C08J9/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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