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Waterborne polyurethane coating for production

by:Huijinchuan Chemical     2020-10-05
Waterborne polyurethane coating for production. Polyurethane production workshop now the main production mode, production of polyurethane products are made with acetone method, so here also emphasizes to introduce the mode of production, mainly use multivariate alcohol and isocyanate after polymerization catalysts, a large number of acetone diluted, and chain extender chain extender, after adding water dispersed, with strong shear force generated finished crude emulsion, the thick emulsion containing solvents of water and acetone, need to isolate the emulsion in water and acetone was able to produce the qualified product emulsion, emulsion and solid content need up to 50. 0%±0. 5%. Polyester polyol polyester polyol, organic matter, usually by organic dicarboxylic ( Anhydride, or ester) And polyols ( Including glycol) Condensation ( Or ester exchange) Or by the lactone and polyols polymerization, under normal temperature is solid. Dibasic acid dimethyl phthalate or benzene anhydride or its esters, adipic acid, halogenated phthalate, etc. Polyols with ethylene glycol, propylene glycol, a reduction of diethylene glycol, trimethylolpropane, pentaerythritol, etc. Different varieties of polyester polyols as different types or the preparation process, the nature is different also, for the polyester polyol is important indicators hydroxyl value, acid value, moisture content, viscosity, molecular weight, density and color, etc. The properties of the polyester polyol and application: polyester polyurethane for molecule contains more polar groups such as ester base, amino, cohesive strength and strong adhesion, high strength, wear resistance. Coating with polyester resin ( The molecular weight of 2000 - 5000). Mainly neopentyl glycol, terephthalic acid, etc. 2. 1. 2 isocyanate polyurethane emulsion preparation commonly used diisocyanate with toluene diisocyanate ( TDI) 4, 4 - Diphenyl methane diisocyanate ( MDI) Such as aromatic diisocyanate and isophorone diisocyanate ( IPDI) Six, methylene diisocyanate ( HDI) 4, 4 - Dicyclohexyl methane diisocyanate ( H12MDI) , 1, 12 Dodecyl diisocyanate ( C12DDI) Such as aliphatic, alicyclic diisocyanate. Because of aliphatic or alicyclic diisocyanate made of polyurethane, the hydrolysis resistance is better than polyurethane made of aromatic diisocyanate, good storage stability of aqueous polyurethane products, other aliphatic diisocyanate yellow degeneration resistance is much better than that of aromatic diisocyanate, so foreign high-quality polyester type waterborne polyurethane are commonly made with aliphatic or alicyclic diisocyanate.
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