Recyclable low-adhesion polyurethane material and preparation method thereof

Abstract

The invention provides a recyclable low-adhesion polyurethane material and a preparation method thereof. The recyclable low-adhesion polyurethane material comprises the following raw materials in percentage by weight: 25-40% of a hard monomer, 45%-65% of a soft monomer, 1%-25% of a low surface energy compound, a chain extender and a catalyst, wherein the low surface energy compound is selected from an organofluorine compound or an organosilicon compound. According to the invention, after the soft monomer and the hard monomer are polymerized to form a prepolymer, an organic fluorine compound and an organic silicon compound with low surface energy are added; the organic fluorine compound, the organic silicon compound and the prepolymer are subjected to condensation polymerization to form a polyurethane material containing a low surface energy chain segment; the low-surface-energy chain segment only exists in the polymer in a physical cross-linking form, and chemical cross-linking does not exist, so that the polyurethane material can be dissolved in a common solvent or melted at a low temperature, so that cyclic utilization is realized; and meanwhile, the surface energy of the polyurethane material can be effectively reduced, so that the adhesion performance of the polyurethane material is reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a recyclable low-adhesion polyurethane material and a preparation method thereof. Background technique [0002] Recyclability is one of the important properties of materials, which can help improve resource utilization efficiency and reduce environmental pollution caused by material preparation. In recent years, a lot of research work has been devoted to the design and preparation of low-adhesion materials that do not stick to water / oil. The field has broad application prospects. The low-adhesion performance of materials is affected by the chemical composition and morphology of the material surface. The existing methods for designing low-adhesion materials severely restrict the realization of recyclable materials. Even low-adhesion performance and recyclability seem to be incompatible materials. of two properties. [0003] The existing low-adhesion materials can be r...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing low-adhesion materials are difficult to recycle, and provide a recyclable low-adhesion polyurethane material and its preparation method. The raw materials of the polyurethane material can be dissolved in a benign solvent or heated at a low temperature. Enables reprocessing and self-healing while exhibiting excellent transparency and stretchability, exhibiting anti-adhesion properties to both aqueous and oily liquids

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