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In recent years, the recyclable and easily degradable polypropylene foam material with excellent comprehensive performance has become the "new favorite" in the foam plastic family, and it is the fastest growing variety of polymer foam materials
.
There are two types of polymer foaming: physical foaming agents and chemical foaming agents
.
Polypropylene is a crystalline polymer, and low-temperature solid-state foaming is limited by crystallization, making it difficult to prepare products with high foaming ratios; high-temperature foaming polymers have insufficient melt strength to maintain complete cells, and have a narrow operating window
.
In order to overcome this problem, Zhao Ling's team cooperated with Wuxi Huitong, Sinopec Beihua Institute, Zhejiang Xinhengtai, Zhenhai Refinery and other units to carry out supercritical CO2 in the aspects of suitable material system, controllable process and high-efficiency industrial equipment.
A series of work on the optimization, strengthening and engineering of foamed polypropylene has formed a "specialized polypropylene material suitable for supercritical CO2 foaming", "new step/step foaming process", "optimizing the construction of flow field structure to achieve high-efficiency scale" Preparation" three major technological innovations
.
Zhao Ling introduced that foaming in the deformable area below the flow temperature can not only break through the restriction of crystallization, but also ensure the stable molding of the microcellular structure and external dimensions of the foamed material
.
Using the above-mentioned innovative technologies, the project team built 2 sets of molded foaming devices with an annual output of 30,000 cubic meters, realizing the world's leading manufacturing of low-density polypropylene microporous thick plates; 10,000 to 60,000 cubic meters of autoclave pressure foaming device, the production efficiency is increased by 25%, and the finished product rate is increased to more than 99%.
The special foaming material has been produced in Zhenhai Refinery, and the new output value from 2016 to 2018 is 331 million yuan, profits and taxes 109 million yuan
.
Zhao Ling said that the supercritical CO2 molding foaming technology has strong versatility.
In addition to polypropylene, it can also be used for the production of polyurethane elastomer microcellular foaming materials.
The pilot test of various thermoplastic polymers and their composite materials has been completed
.
