High-energy-storage double-layer-wall-material phase change microcapsule

Abstract

The invention discloses a high-energy-storage double-layer-wall-material phase change microcapsule. According to the phase change microcapsule, an organic phase change material is taken as a core material, urea resin is taken as an outer-layer wall material, and a vinyl polymer is taken as an inner-layer wall material; the mass ratio of the urea resin to the vinyl polymer in the wall materials is 1 to (0.3-1.7); a cross-linking agent is an small organic molecule with two groups including double bonds and hydroxymethyl; and the mass ratio of the core material to the wall materials is (1-3.5) to 1. The double-layer-wall-material phase change microcapsule has the advantage that a urea resin microcapsule is hydrophilic and is not easily agglomerated, and polymethyl methacrylate is low in hydrophobic permeability when uniform particle sizes and high embedding rate are guaranteed.

Description

technical field [0001] The invention relates to a high-energy-storage double-wall phase-change material microcapsule, which is suitable for the field of phase-change energy storage and can effectively expand the application range of the phase-change material. Background technique [0002] With the rapid development of global industry, global energy is increasingly scarce, and the depletion crisis of fossil energy and environmental pollution have attracted more and more attention from the world. Therefore, improving energy efficiency and developing renewable energy has become one of the hot issues that all mankind, including the scientific and technological circles, are concerned about. Latent heat energy storage (that is, phase change heat storage) is to store energy by using phase change materials to absorb or release a large amount of heat when the phase change occurs. During the phase change process, the temperature is kept basically unchanged, and its energy storage dens...

AI Technical Summary

Problems solved by technology

However, both materials have their own advantages and disadvantages: acrylic polymer wall materials have excellent water and weather resistance, but are not oil-resistant and wear-resistant. It is best to use fillers such as foams, fabrics, or easily in the presence of organic solvents. Cracks, resulting in 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. As a wall material, the phase change microcapsules can have good dispersion, and because the surface The existence of hydrophilic groups 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

[0005] CN 102492174 A discloses microcapsules of capsule core material and capsule wall material, the core material is dicyclopentadiene, and the wall material is made of urea-formaldehyde resin, and its hygroscopicity cannot be avoided

[0006] CN 104004499 A discloses microcapsules of capsule core material and capsule wall material. The core material is tetradecane, and the wall material is made of urea-formaldehyde resin and melamine resin. The addition of melamine resin can be made to a certain extent. The overall density of the microcapsule wall material is higher than q, but its hygroscopicity cannot be avoided