Transparent low-hardness impact-resistant polyurethane elastomer and preparation method thereof

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a transparent low-hardness impact-resistant polyurethane elastomer and a preparation method thereof. Comprising the following steps: (1) preparation of a component A: mixing a chain extender, dimer acid modified dimer acid polyester polyol and polyether polyol, dehydrating until the water mass content is less than 0.05%, cooling, adding an antioxidant and a catalyst, and stirring to obtain the component A; (2) preparation of a component B: carrying out heating reaction on dimer acid modified dimer acid polyester polyol, polyether polyol and diisocyanate to obtain a prepolymer component B; and (3) mixing the component A and the component B, pouring into a mold, demolding, and vulcanizing at normal temperature to obtain the transparent low-hardness impact-resistant polyurethane elastomer. According to the preparation method provided by the invention, the transparent appearance of a product system is ensured by a