PVA is a kind of raw material with strong adhesive, skin film flexibility, smoothness, and wear resistance, is widely used in glue, adhesives, coatings, emulsifiers, dispersants, food, textiles, paper, steel, agriculture, and other fields. However, in the process of producing PVA often encounters a large number of bubbles. bubbles in PVA is not difficult to solve the problem, a small amount of PVA defoamer can do a very good defoaming effect.
The PVA prototype is a powder granular, that needs to be dissolved processing to make liquid products, but in the process of dissolution, due to the viscosity of the PVA aqueous solution being large, in the mechanical high-speed stirring, easy to mix in air, resulting in bubbles can not be eliminated by themselves. The polyvinyl alcohol mixing process has a large number of bubbles, how do we solve the problem of air bubbles?
(I) PVA defoaming method.
(1) PVA dissolved before the first PVA soaked in cold water to dissolve, so that the air and volatiles in PVA as much as possible, and then gradually stirred and warmed up, can effectively eliminate the generation of foam.
(2) when the foam occurs, stop stirring, and heating, after the foam disappears on its own, and then gradually increase the temperature and stirring. Generally, repeat two or three times, and the foam can be greatly reduced.
(3) If there is still a large number of bubbles during the stirring process, add a small amount of polyvinyl alcohol PVA defoamer, and add one-thousandth of the amount (based on the total weight of the solution).
(Picture: Nanhui polyvinyl alcohol PVA defoamer sample)
(Ⅱ) Polyvinyl alcohol PVA defoamer uses and effects how?
Nanhui defoamer manufacturers for the industry blistering problems, production and development of polyvinyl alcohol PVA defoamer effect is very good (according to the use of customer experience feedback), it is a modified silicone polyether system configured from polyether + silicone + other additives, has excellent defoaming and foam inhibition effect, in high temperature, strong acid, and alkali harsh conditions still maintain the defoaming effect, just to meet the polyvinyl alcohol customer defoaming needs.
