Preparation method of double-layered wall material phase-variable micro capsule

Abstract

The invention discloses a preparation method of a double-layered wall material phase-variable micro capsule and in particular relates to a dense double-layered structure which is formed by connecting inner and outer two layers of wall materials by adopting an interface polymerization under the action of a cross-linking agent, wherein the inner and outer layers of the wall materials are prepared by adopting an in-situ polymerization. The preparation method comprises the step of forming the stable double-layered structure under the action of the cross-linking agent with urea formaldehyde as the outer layer wall material and an alkene polymer as the inner layer wall material, wherein the cross-linking agent is an organic micromolecule containing double bonds and hydroxymethyl radical groups. The method is suitable for an organic core material; on the basis that the particle size is uniform and the embedding rate is high, the double-layered wall material phase-variable micro capsule also has the advantages of the hydrophilic performance and not-easily-agglomeration performance of a urea formaldehyde resin micro capsule, is hydrophobic with polymethyl methacrylate and is low in permeability.

Description

Technical field [0001] The invention relates to a method for preparing double-walled microcapsules, in particular, organic materials are used as core materials, urea-formaldehyde resin is used as outer wall materials, and vinyl polymers are used as inner wall materials, and an in-situ polymerization method is adopted. Polymerize in the water phase and the oil phase respectively, and at the same time, under the action of the crosslinking agent, use the interfacial polymerization method to graft the two wall materials to form a stable double-layer structure; Background technique [0002] Microcapsule technology is a technology that coats dispersible particulate materials (solid, liquid and gas) with film-forming materials in recent years to form a micro-container with a core-shell structure. It can change the state, quality, volume and performance of the material, and protect Sensitive ingredients, enhance stability, control core material release, reduce or conceal bad taste, reduc...

AI Technical Summary

Problems solved by technology

But both materials have their own advantages and disadvantages: acrylic polymer wall material has excellent water and weather resistance, but it is not oil-resistant, not wear-resistant, and it is easy to crack when used as a filler such as foam, fabric, or in the presence of organic solvents , causing leakage of the core material, and poor dispersion during the preparation process, prolonging the post-processing time; urea-formaldehyde resin is oil-resistant, wear-resistant, and low in cost. The existence of water group shortens the suction filtration process of the finished phase change microcapsules, but the simple urea-formaldehyde resin wall material is not dense enough and has hygroscopicity, which weakens the protection of the core material and leads to leakage of the core material