Coating defoamer solutions for chemical companies

Customer type

1. Customer information: An Indonesian chemical company, a distributor of Nanhui, a customer in the coatings industry encountered a foam problem that he could not solve, and encountered trouble when the pigment was stirred and blended, and used tributyl phosphate defoamer , Defoaming is no problem, but customers think it is too expensive.

2. Sample information: two samples of water-based paint/defoamer

3. Customer requirements: When the defoamer is added to the water-based paint, there should be no floating oil or floating matter. Defoaming and suppressing foam should be close to the sample defoaming agent.

Principle and analysis of defoaming

1. Reasons for blistering:

①External factors: During paint construction, such as air spraying, airless spraying, curtain coating, etc., turbulence, splashing, impact, air pockets, etc. in the paint will be added to the free energy of the paint system to varying degrees, making it easy Foam

②The main factor: when adding emulsifier to water-based latex paint, the surface tension of the emulsion system is greatly reduced due to the use of the emulsion

2. Foaming hazards:

① The air in the foam hinders the dispersion of pigments or fillers

② Insufficient utilization of equipment affects production quality

③ The foaming is still at the stirring speed, so that the mixing time is prolonged

④ The pigments and fillers cannot be fully wetted

⑤ It also causes dissatisfaction and uneven weight in the continuous filling production line

⑥ There are pits, small holes, etc. on the coating film during use

3. Analysis of the types of defoamers

①Tributyl phosphate is more expensive, has poor foam suppression and cannot be stirred, otherwise it will regenerate foam

② Although the price of n-octanol is low, its ability to break and raise bubbles is poor and contains bad gas, which is harmful to human health.

In this regard, Nanhui has developed the CQ-104/105/106 type water-based paint defoamer, which can effectively eliminate the foam generated by the construction of low-viscosity emulsions and emulsifiable concentrates, and its characteristics will not produce shrinkage. It has low dosage, high efficiency, It has strong defoaming durability, good versatility, no side effects, and paint brushability, which has reached the effect of well-known foreign brands.

Comparison of defoaming test

Formula selection