Polymer polyol (POP)

POP is a second-generation polyether polyol developed on the basis of general-purpose polyether. It is produced by bulk polymerization of vinyl monomers (such as acrylonitrile, styrene, vinyl chloride, acrylate, etc.) in polyols. of. POP consists of a dispersion of a vinyl polymer in a liquid polyol and a grafted copolyether, where the graft copolymer plays a significant role in the stability of the dispersion, the processability of the POP, and the performance of the final PU product.
POP is mainly used to prepare PU soft, semi-rigid foams and elastomers with high resilience and high load. It is mixed with high-activity, high-molecular-weight polyether polyols to significantly improve the strength properties of PU products. And can overcome the shrinkage of PU soft molded products.
The research and development of POP abroad has been very active. New varieties are continuously available and play a significant role in promoting the development of the PU industry. At present, there are certain research foundations in China. These types of products are also included in the imported polyether grades. During the "Eighth Five-Year Plan" and "Ninth Five-Year Plan" period, the study on POP was deepened, especially the industrialization and application of high solid content POP, and some new series of varieties were developed.
The Dawning Chemical Research Institute has done a lot of work on the research and development of POP technology since the end of the 7th Five-Year Plan period. It has developed POPs with non-volatile matter mass fractions of 20% and 40%, and has successively transferred several companies. The PU industry contributed to the early use of POP. Shanghai Gaohua No. 3 Plant developed a GPOP-42 POP with a non-volatile matter content of 42% based on the transfer technology of Limingyuan. It has a low viscosity, good storage stability, can be used for the production of high-bearing block repentance, and can also be used to produce high-hardness seat cushions. After using the product in several units in Zhejiang and Shanghai, it is believed that the product can replace imported products. In addition, the GP-102 POP developed by Jinling Petrochemical Company Chemical Plant No. 2 has recently won the Nanjing New Product Award. It passed the municipal appraisal at the end of 1998. The sales volume in the first half of this year has reached 2,000 tons, making it the leading product of the plant.
In 1993, Tianjin Petrochemical No. 3 Plant and Tianjin University jointly developed and developed the second generation POP product---TPOP93/28. Its performance and indexes all rank the leading position in China and can be used as an alternative to imports. In 1997, the plant also developed a series of products TPOPC-40 and TPOPC-28 with a non-volatile mass fraction of 40%, and successively passed the expert appraisal organized by Tianjin Economic Commission. TPOPC-40 has obvious advantages compared to previous products: 1 It has good foam latitude and can be applied to foam foam of different densities. 2 At the same density, the foam hardness can be improved by 1 grade.