Is it difficult to produce SG-10 type PVC resin?
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Is it difficult to produce SG-10 type PVC resin?
It’s difficult; manufacturers generally no longer produce PVC resins of type 8 or higher. At present, only a few manufacturers in China produce such resins with a low degree of polymerization. The main difficulties lie in 1: the selection of chain transfer agents, as well as their dosage and addition method ； 2: Dispersed system 3: Initiation system. It will take a long time of experimental exploration to determine these values
It is very difficult to produce high-grade resins; first, one must consider the pressure and temperature in the polymerization reactor, and these conditions need to be met； Selection and dosage of dispersant and initiator systems ； Regarding the selection of chain transfer agents, two types are currently used by other manufacturers: ① thioethanol ② 1-chloro-1-iodoalkane
Haven’t been exposed to it before; I came in to learn* it*
At present, no company in our country produces PVC resins of type 8 or higher
First, 1: The dispersion system needs to be changed; variations will occur depending on the type of reactor； 2. The selection of chain transfer agents requires experimentation; thioethanol is gradually being phased out, but it remains the preferred choice in the market due to its stability ； 3. The initiating system requires modification, but it is only a change in quantity ； 4. The temperature and pressure of the reactor under specific control need to be adjusted as necessary; moreover, at the beginning of production, significant changes in the degree of polymerization occur, which has an impact on both the discharge system and the drying system ； In short, depending on the actual configurations of each manufacturing company, it requires some exploration to gain a comprehensive understanding, but it’s not difficult.
That’s the principle, but currently there are a few companies carrying out related experiments, as well as considerations regarding the choice of various additives. Generally, few resin manufacturers are able to make large-scale adjustments to these additives, and the heat exchange capabilities of current polymerization reactor manufacturers are not sufficient either.