Customer type
1. Customer information: The defoamer used by Thailand Yuanyi Magnetic Card Co., Ltd. could not effectively solve the defoaming problem. However, I searched for polyvinyl alcohol defoamer by google and found Nanhui. I hope they can solve the defoamer. problem.
2. Sample information: PVA polyethylene
3. Customer requirements: can defoam without affecting the viscosity of the product
Principle and analysis of defoaming
1. Analysis of the cause of blistering:
PVA polyvinyl alcohol is a porous substance, and air and other volatiles are adsorbed in the pores. When dissolving, air and volatiles escape. Because the PVA solution has a certain surface activity and viscosity, and the liquid film has appropriate mechanical strength, a large amount of foam will be produced under stirring conditions. To
2. The hazards of blistering:
Polyvinyl alcohol is currently one of the main sizing agents commonly used in textile mills, especially polyester-cotton blended fabrics that almost all use P VA as an adhesive. Polyvinyl alcohol can be divided into partial alcoholysis grade and complete alcoholysis grade according to its degree of alcoholysis. The foaming of PVA polyvinyl alcohol when it is dissolved will affect the sizing production.
3. Recommended for defoaming with defoamer
The defoamer for PVA polyvinyl alcohol developed by Nanhui is a defoamer refined by modified polyether silicon through a special process. The defoamer has good thermal stability and chemical stability, can produce stable unbalanced surface tension in the foam, control the foam in the entire production process, completely eliminate all kinds of bubbles, and improve product quality. It is a high-efficiency defoamer with long-lasting foam suppression and rapid defoaming performance. Especially for small and abundant bubbles, it has the function of rapid defoaming and defoaming.
Features:
1. It has strong defoaming and anti-foaming power, with low dosage, and does not affect the basic properties of the foaming system. ...
2. Good heat resistance, chemical stability, non-corrosive, non-toxic, no adverse side effects, non-flammable, non-explosive. ...
3. Its performance is comparable to imported products, and the price is more obvious. ...
Recommended dosage: The addition amount of defoamer for polyvinyl alcohol is 0.1 to 1℅ of the total volume, but the most economical dosage should be determined after the process test; it can also be mixed with other powder additives before use.
Comparison of defoaming test
