Synthesizing Polyurethane Foam With Ethylene Glycol Recycling Waste Polyester

With the development of the PET, the amount of the PET is increasing, there will be a result in wastage of resources and a lot of white pollution, if we don't recycle waste PET. So, the reseaech of resolving this problem has been a big object. The waste PET includes Waste PET fiber, waste PET bottle scrap, waste PET film, and so on. In this thesis, we use glycolysis to recycle the waste PET, and reuse it in to polyurethane foam.In addition, China's building energy consumption is sustained and rapid upgrading in recent years. Building energy efficiency become to all the hot issues of social concern.The rigid polyurethane foam is a very good insulation material, it mainly used in external wall insulation, This can increase the usable area inside the building, more and more expensive cities on the land have special appeal. So we will organically combine the recovery polyester and polyurethane foam , it not only solve the disposal of waste polyester ,But also the foam material has high strength, light weight and low cost.This paper studied the glycol alcoholysis craft for waste PET fiber, analyzed the influence of reaction temperature, the reaction time and the catalyst density to the alcoholysis craft, The best glocoholysis craft is: at 196～198℃, ethylene glycol and waste polyester fiber weight ratio was 1:4, the glycolysis time was 2h,and 0.5% zinc acetate was used as catalyst. PET was thoroughly glycolysed and the glycolysis conversion rate is 97.08%. The glycolysis products were analyzed by hydroxyland acid values and identified by different techniques, such as DSC, IR. The glycolysis predominant glycolysis product was BHET monomer, its purity reached 96% after crystallization depuration.The chemical structure of BHET that: In BHET the right position on the two-OH, -OH can react with more isocyanate, after a series of chain growth, vapor, crosslinking reaction and preparation of polyurethane foam.This article discussed the influence of auxiliary materials,such as foam catalyst and foaming agent,on the compression performance and density of rigid polyurethane. The products were characterized by IR, DSC, optical microscope. determine the product structure of polyurethane, product of the melting point of 156℃, and to understand the cellular structure of foam, this network skeleton and the cell structure of foam support increased power, improves the compression performance.When a fixed proportion of raw materials, catalyst is 0.32g and foam is 0.8g, the result shows that polyurethane foam has higher compressive strenger and lower density.