Polyvinyl alcohol glue is made of polyvinyl alcohol + hydrochloric acid + alkali + preservative + thickener + polyvinyl alcohol glue with antifoam agent configuration, each additive added in different ratios resulting in different effects, antifoam agent is mainly to eliminate the problem of bubbles generated by the glue in the production process.
Polyvinyl alcohol is a powdered porous material, and water contact, hydrophilic low molecular substances (alcohols, esters) will be water into the void and the air excluded, which is the main source of gas formed foam, in addition to the case of stirring easily caused by foam, due to the viscosity of the PVA aqueous solution, the liquid film has a certain mechanical strength, and the foam does not disappear easily, so the need to add a certain percentage of the production dissolution process Polyvinyl alcohol glue defoamer for defoaming and foam control.
In the preparation of aqueous solution, the glue is not easy to bubble, but in the solution concentration is high, fast speed, will also produce a small amount of foam, in order to eliminate the bubbles in the glue, usually add polyvinyl alcohol glue with defoamer, it is 0.01-0.05% (based on PVA) of octanol, tributyl phosphate or 0.2-0.5% (based on PVA) of silicone emulsion. It can quickly eliminate blistering and does not affect the use and production of glue.
Polyvinyl alcohol glue in the preparation of the production process because it is in the 60 ° C ~ 120 ° C high temperature operation, so we choose polyvinyl alcohol glue with defoamer must also be able to resist high temperature system, Nanhui defoamer manufacturers for polyvinyl alcohol glue developed defoamer, is in high temperature, strong acid and alkali harsh conditions, can still maintain good defoaming and foam inhibition performance, is a multi-functional Polyvinyl alcohol glue with defoamer.
