(PVC) What is the relationship between the plasticity absorption amount and the quality index of PVC products?
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(PVC) What is the relationship between the plasticization absorption amount and the quality index of PVC products? Is it related to apparent density? My company's PVC plasticity absorption has recently been between 18 and 19. How can I increase it to above 19? This post was last edited by edc1233 on 2008-9-15 20:50 ]
This has a lot to do with your dispersion set formula. Adjusting the dispersant is the core technical secret of each manufacturer.
There are many factors that affect the plasticization absorption of PVC resin, such as monomer quality, water-to-oil ratio, dispersant type and proportion, water quality, operation method, etc. It is recommended to start from these aspects.； Lift and adjust the type and proportion of dispersant, the effect is relatively obvious.
The ratio of primary dispersant and auxiliary dispersant! This requires long-term and slow adjustment!
Oh, the ratio of the dispersant should have a great influence. The workshop adjusted the formula some time ago, and the concentration also changes every time the dispersant is mixed. The finer material should be a problem with the dispersant formula. If the plasticization absorption is low, how to adjust the main and secondary dispersants to increase it?
Adjust the type and proportion of dispersant and add secondary dispersant, the effect is relatively obvious. Pay attention to changes in the pH value of the water. Too much change will affect the effect of the dispersant.
If it is a five-type material, your oil absorption 18-19 is indeed not high, and it also depends on the apparent density. The oil absorption rate and apparent density are inversely proportional, and simply increasing the oil absorption rate will affect the apparent density. Generally, a compounding method of three dispersants is used. The main dispersant is 72.5% and 88% alcoholysis degree, and 55% auxiliary dispersant is added.