A low-hardness polyurethane elastomer solvent and preparation method

The present invention discloses a low hardness polyurethane elastomer solvent and a preparation method, the raw material consists of two parts, A component comprising 100 parts of polyester polyol, toluene diisocyanate, 15 to 30 parts, 0 to 20 parts of a softening agent , 3 to 10 parts filler; 100 parts of component B chain extender, 0 to 0.5 parts defoamer, 0.02 to 0.05 parts of the catalyst. Alcohols by the chain extender amine chain extenders and trifunctional chain extender consisting of alcohol, wherein the alcohol amine chain extender is triisopropanolamine (the TIPA) and diethanolamine (DEA) or triethanolamine (TEA) of the mixture molar ratio of 0.5 to 1.5; trifunctional alcohol chain extender is glycerol (of GLY), trimethylolpropane (TMP) or trimethylolethane (TME) and the like; trifunctional alcohol molar ratio of chain extender and chain extender mixed alkanolamine is 0.25 to 1.5. The material has good mechanical properties, good solvent resistance and machinability. Painted art may be used for printing and the like.