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Preparation Method And Use Of Waterborne Polyurethane Material
- Nov 23, 2016 -

1. the oligomer polyols

Preparation of waterborne polyurethane adhesive used in the oligomer polyols based on polyether alcohols, mostly polyester diol, sometimes using polyether-triol, low degree of branching polyester polyol, polycarbonate diol and other smaller varieties of oligomer polyols.

Polyether polyurethane good flexibility at low temperature, good water resistance, and commonly used poly propylene glycol (PPG) lower price than polyester diol, so most of the research and development of waterborne polyurethane with poly propylene glycol as the main low polymer polyol raw material. By poly-tetrahydrofuran ether glycol polyurethane mechanical strength and resistance to hydrolysis are better, but higher prices, limiting its widespread application.

Polyester polyurethane high strength, good adhesion, but hydrolysis-resistant properties of polyether polyester itself bad, therefore uses the General raw material of polyester-polyurethane and its storage stability period is shorter.

2. the isocyanate

Preparation of polyurethane emulsion of diisocyanate TDI, MDI and other aromatic diisocyanate, IPDI, HDI, H12MDI, fat family, cycloaliphatic diisocyanates. By aliphatic or cycloaliphatic diisocyanates made of polyurethane, resistance to hydrolysis than aromatic diisocyanate made of polyurethane is good, good storage stability of waterborne polyurethane products. Foreign high-quality polyester are commonly used as waterborne polyurethane aliphatic or cycloaliphatic isocyanates feedstocks, while the prices of raw materials in China and restrictions, most only TDI as the second isocyanate raw materials.

Polymethylene polyphenyl isocyanate are generally used for preparation of vinyl-polyurethane and isocyanate emulsion.