High-polymerization-degree PVC resin
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May I ask: What are the differences in the synthesis process of high-polymerization-degree PVC resin compared to ordinary PVC resin?
There is a difference, but it involves confidential information, so it’s not convenient to go into detail
Basically similar, but other additives are added, and the cycle is very long. High requirements are placed on the temperature of the circulating water, so production is only possible in autumn and winter.
You can look for articles or patents published in PVC-related journals on the topic of high polymerization degree; there are already many such ones available in China.
The production of high-polymerization-degree resins requires the addition of chain extenders, as well as stricter requirements regarding the temperature of the polymerization reaction and the temperature of the circulating water; manufacturers keep the production methods as trade secrets
Actually, chain extenders aren’t any secret – there are only a few types of them. Triallyl cyanurate, diallyl maleate, diallyl terephthalate. Moreover, even if you know the concentration and use the dosage based on a formula, the viscosity of the resulting product may not be very stable. The reason is that your chain extender is not evenly dispersed. The dispersion process for chain extenders is very precise
Additionally, PVC resins with polymerization degrees of 2500 and 4000 can be produced in the SG-3 temperature range. As for polymerization degrees of 5000, 6000, and 8000, I estimate that it is indeed necessary to use a chain extender under conditions of 30 to 40 degrees Celsius for production. And so far, I have not seen any actual application cases in China for PVC resins with a polymerization degree of over 4,000. :lol
Could the friend upstairs explain it in more detail? We are now preparing to work on the project for high-polymerization-degree PVC resin! Thank you!