Urea-formaldehyde/Melamine Resin Microencapsulated Phase Change Materials Research And The Modification Of Organic And Inorganic Composite/CD Microencapsulated Phase Change Materials Research

With the energy crisis and the changes in the pattern of world energy, development of new energy sources and improving energy efficiency has been much attention .Because of its energy-saving environmental protection and thermal storage , the microencapsulated phase change materials, not only in energy storage, heat exchange and temperature control field has a wide range of applications, but is also an important way to efficient use of energy. Improving its thermal storage capacity, that is, to improve their phase-change enthalpy and its associated exploring new packaging materials and preparation method is key in the field of energy conservation the focus of research content.In this paper, three main aspects of microencapsulated phase change materials have been studied: first, respectively, urea-formaldehyde resin and melamine resin microcapsules of paraffin were used as wall material. By choosing the cross-linking agent and polyvinyl alcohol resorcinol systems regulators the process has been improved. The content of Urea-formaldehyde resin microencapsulated phase change materials has increased from 13.16% to 47.42%, and the parcel rate is from 8% to 50.81%; The content of melamine resin microencapsulated phase change materials has increased from 14.62% to 36.66%, the parcel rate is from 8.77% increased to 52.37%. Ultimately more ideal microencapsulated phase change materials is got, using FT-IR, DSC and SEM, they are analyzed and characterized. The results shows that the modifier PVA system makes the reaction system more homogeneous and the cross-linking of resorcinol is better to high polymerization of urea-formaldehyde prepolymer, as would achieve the better coating. Secondly, choiceing CD as the wall material, It si found that the core material of the enthalpy is increase of 29 percentage points. CD is an effective, new type of micro-capsules packaging materials, and the corresponding coating mechanism was also discussed. Finally, now regularly used to prepare microencapsulated phase change materials, two major categories of wall materials ,organic polymer materials and porous inorganic materials, conducted a complex and comparative study .The use of polymer materials is better for that he core material is not easy to leak and porous inorganic materials.and The use of porous inorganic materials ,it has the heat transfer advantages .Given two points ,a new preparation method to obtain the organic / inorganic composite's new microencapsulated phase change materials is given, the products are characterized by DSC. The results show that by this invention, phase change material which is located within is not easy to leak, but also the content of its core material is not descase, because the core material is used to be encapsulated inside, compared with traditional matter.