| 摘要 |
PURPOSE: A manufacturing method of non-shrink polyurethane is provided to provide a non-shrinkable polyurethane foam not needing crushing in density region of wide range by using a resin premix comprising polyol with specific molecular weight and OH value. CONSTITUTION: A manufacturing method of non-shrink polyurethane comprises 100.0 parts by weight of polyol resin premix, 30-70 parts by weight of isocyanate, and 1-10 parts by weight of foam. The polyol resin premix comprises: polyetherpolyols or polyester polyol of which weight average molecular weight is 6,000-10,000, and OH value is 25-30 mg KOH/g; polyetherpolyols or polyester polyol of which weight average molecular weight is 6,000-10,000, and OH value is 20-24 mg KOH/g; polyetherpolyols or polyester polyol of which weight average molecular weight is 3,000-6,000, and OH value is 30-60 mg KOH/g; and polymerpolyol, in which acrylonitrile, styrene, or a mixture thereof is dispersed or grafted to polyetherpolyols or polyester polyol of which weight average molecular weight is 6,000-10,000 and OH value is 20-30 mg KOH/g.
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