Introduce the production method of P-2500 resin

I am currently working on P2500, P3000, P4000, and P3000 matting. Mainly, a chain extender is introduced into the basic formulation and process conditions of SG-3 resin. Chain extenders can include diallyl terephthalate, diallyl maleate, etc. As for the specific formula, it cannot be disclosed in too much detail due to confidentiality agreements. Furthermore, improper addition of the chain extender can result in it failing to function. The degree of polymerization fluctuates too much. There is a series of pretreatment processes before the addition of the chain extender. :)

Thank you; everyone knows that keeping things confidential is the right thing to do

There are mainly two methods for producing P-2500 resin: one is the low-temperature method, and the other is the chain-extender method. Each of these methods has its advantages and disadvantages, and manufacturers can choose the appropriate one based on their own circumstances

A combination of the low-temperature method and the chain-extender method is used!

VCM SW 60RT50(E-50) GH20 (420H) EHP-75 CNP-75 LW-200 liquid zinc C7-9 NH4HCO3 NH3H2O EDTA HEO S102 NaOH reaction temperature

I prefer the low-temperature method; the use of chain extenders results in the formation of a small amount of gel, which affects certain processing properties. For example, the P3000 matting resin mentioned on floor 2 likely exhibits matting properties after the gel content exceeds 5%, as this leads to the resin having such properties once it is processed into products； As for the low-temperature method, it is best for the poster to use chilled water in summer, or employ a composite initiation system, or reduce the amount of initiator used, in order to ensure a smooth progression of the reaction during summer.

This post was last edited by solo1981 on 2011-2-24 at 12:45. With the cryogenic method, you need to lower your reaction temperature to around 30 degrees Celsius. The reaction cycle will last for fourteen to fifteen hours, resulting in very low production efficiency of the polymerization reactor. Of course, you can also consider using ultra-high-efficiency initiators whose half-life is only four hours at temperatures in the low 30s degrees. This ensures that the pure cryogenic method also requires only a six-hour reaction cycle. However, this results in a high cooling load, and there is also the issue of safe storage of the initiator. That super-efficient initiator is quite dangerous. PS: To explore PVC with an ultra-high degree of polymerization that could replace rubber, Shin-Etsu once achieved a polymerization degree of 8000–10000. I guess it might be possible to achieve this by combining the low-temperature method with the chain-extender method. In that case, such a super-efficient initiator might also be necessary.

I agree with the understanding of the polymerization time given on floor 8, but why do we necessarily need to keep the reaction time for PVC resins with a high degree of polymerization within 6 hours? High-quality, highly polymerized PVC resin can also be obtained after reacting for 10 to 14 hours.

As time doubles, energy consumption per batch increases by more than a factor of two. At the same time, the production capacity of the equipment dropped by over 50 percent. As a result, no one wants to use the pure cryogenic method.

Let’s also learn a bit about this. Those of us who work in online testing should know more about the manufacturers’ production processes, especially in the field of chemical synthesis. Please give us your continued support