A kind of degradable water-soluble elastomer and preparation method thereof

Abstract

The invention provides a degradable water-soluble elastomer and a preparation method thereof. The degradable water-soluble elastomer comprises a soft segment prepolymer of a copolymer of polylactic acid and polyethylene glycol, a sulfonic acid type hydrophilic monomer and The copolymer of isocyanate is a block copolymer of hard segment prepolymer; wherein the mass ratio of soft segment prepolymer to hard segment prepolymer is (25‑120): (25‑80). The preparation method includes: ring-opening polymerization of lactide and polyethylene glycol in the presence of a catalyst to obtain a soft segment prepolymer of polylactic acid and polyethylene glycol copolymer; Polymerization reaction to obtain sulfonic acid type hydrophilic monomer and isocyanate copolymer hard segment prepolymer; mix soft segment prepolymer and hard segment prepolymer to carry out polymerization reaction to obtain degradable water-soluble elastomer. The degradable water-soluble elastomer has good mechanical strength, good dispersibility in water, is degradable, and has environmental protection.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic elastomers, and in particular relates to a degradable water-soluble elastomer and a preparation method thereof. Background technique [0002] Elastomer refers to a polymer material that deforms significantly under weak stress and can quickly return to its original state and size after stress relaxation. Elastomers include rubber and thermoplastic elastomers. Among them, thermoplastic elastomers not only have the excellent properties of high elasticity, aging resistance, and oil resistance of traditional cross-linked vulcanized rubber, but also have the characteristics of convenient processing and wide processing methods of ordinary plastics. Widely used in different fields. [0003] The molecular structure of thermoplastic polyurethane elastomer is composed of soft segments and hard segments alternately. The soft segment with low glass transition temperature forms a continuous matrix, makin...

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Problems solved by technology

[0004] However, the elastomers in the prior art usually have a large molecular weight, and the macromolecular chains are easy to form a complex entanglement structure. After the material contacts water, it will swell first, and then it can be dissolved. The water solubility is not good, and it cannot be well in water. scattered, unable to meet the needs of use in special industries and special oil and gas engineering fields

In addition, most of the elastomers in the prior art are not degradable, especially in oceans, rivers and other water bodies, it often takes hundreds of years for elastomer solid waste to degrade naturally, and a large amount of use will cause serious environmental pollution; many rubber and plastic elastomers Toxic and harmful compounding agents need to be added in the synthesis process of the body, so that the terminal elastomer products often have certain toxicity

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