Method for preparing polyurethane heat-preserving material from epsilon-caprolactone by-product

Abstract

The invention discloses a method for preparing a polyurethane heat-preserving material from an epsilon-caprolactone by-product. The method comprises the following steps: feeding a caprolactone by-product and micromolecular polyol in a certain proportion, adding an antioxidant and a catalyst, carrying out a reaction at 140 to 200 DEG C, then carrying out heat-preserving at 205 to 240 DEG C for 1 to3 h, adding a catalyst, and gradually reducing a pressure until an acid value of a system is no more than 2.0 mg KOH / g; subjecting a product to decolorizing treatment; and adding a foaming agent, a foam stabilizer, isocyanate and a catalyst into obtained polycaprolactone polyol, and carrying out foaming so as to prepare a polyurethane foam plastic. The polyurethane foam plastic heat-preserving material obtained by using the method provided by the invention has a heat conductivity coefficient of less than 0.10 W / (m.k) and an apparent density of less than 900 kg / m3, and can be used as a heat-preserving material. The method provided by the invention can solve the problems of recovery and utilization of a caprolactone oligomer; meanwhile, a heat-preserving material prepared by using the method provided by the invention can be used for industrial heat-preserving engineering.

Description

technical field

[0001] The invention relates to a method for preparing a thermal insulation material, in particular to a method for preparing a polyurethane thermal insulation material by using ε-caprolactone by-products. Background technique

[0002] ε-caprolactone (ε-CL) is an important intermediate in organic synthesis, mainly used in the synthesis of polycaprolactone polyols, polycaprolactone and other ester polymers for copolymerization and modification, because polycaprolactone Lactone has good non-toxicity, biodegradability, compatibility, and drug penetration, so it has been widely used in degradable plastics and biomedicine.

[0003] The synthesis of ε-caprolactone is generally generated by Bayer-Villiger reaction of cyclohexanone, peroxyacetic acid or peroxypropionic acid under certain conditions. ε-caprolactone is a temperature-sensitive substance, which is easy to self-polymerize into oligomers with a degree of polymerization of 2-10 at high temperature. [000...