Phase change material of safety urea resin micro-capsule and preparation method thereof

Abstract

The invention discloses a safety urea resin micro-capsule and a preparation method of the safety urea resin micro-capsule. The safety urea resin micro-capsule is prepared by carrying out in-situ polymerization on an organic phase change material functioning as a core material and urea resin functioning as a wall material, wherein the urea resin functioning as the wall material is obtained by subjecting formaldehyde and ureophil at the molar ratio of 1:1.4-1.6 to condensation polymerization; the organic phase change material functioning as the core material is one or more of liquid paraffin, hexadecane, n-octadecane and solid paraffin, and based on the ratio of the mass of the core material, namely the organic phase change material, to the total mass of the formaldehyde and ureophil in the wall material, the ratio of the core material to the wall material is 1.2-1.5:1. On the basis of ensuring the uniform particle size and high enveloping ratio of the safety urea resin micro-capsule disclosed by the invention, the content of the formaldehyde meets E1 of the European Norm (EN) standard, namely, the content of the formaldehyde in the micro-capsule is less than 10mg / 100g.

Description

Technical field [0001] The present invention involves a kind of safety mileo formaldehyde resin micro -capsule phase transformation material and its preparation method. Specifically, an organic phase change material is the cysts, the meritaldehyde resin as the cyst wall, and the use of the original polymerization of the plastic synthetic synthetic synthesis of the micro -capsule micro -capsule phasePreparation method of material. Background technique [0002] The phase -changing materials can absorb or release a large amount of potential heat during the phase change process. In the process, the temperature of the material itself is very small. It is a good energy storage and temperature control material. It can be used as energy memory, energy saving, temperature control, etc.The field has great significance, which is very suitable for solving the problem of energy supply and demand imbalance.However, the phase -changing material is easy to cause liquid leakage and pollution envi...

AI Technical Summary

Problems solved by technology

However, the large amount of formaldehyde released is a major disadvantage

The toxicity and teratogenicity of formaldehyde have been confirmed. There are requirements for the residual formaldehyde content of building materials and textiles at home and abroad. Therefore, the high content of free formaldehyde seriously limits its application and industrialization.