Production technology of redispersible emulsion powder

Production technology of redispersible latex powder

The main factors that affect the properties of redispersible latex powder are the selection of monomer and the introduction of functional monomer.

And the dosage and latex particle design.

1 monomer selection

At present, vinyl acetate, methyl acrylate, methyl methacrylate and enoic acid J are commonly used in the preparation of Ding redispersion emulsion powder. The main products are ester, butadiene, styrene, 2-ethylhexyl acrylate, vinyl TERT carbonate, etc. The types of redispersible latex powder are as follows

Vinyl acetate ethylene copolymer (EVA)

Styrene butadiene rubber (SBR)

Alkenyl ester polymer (PAE)

Styrene acrylic acid copolymer (SAE)

Vinyl acetate ethylene TERT carbonate copolymer

Properties of vinyl acetate Tertiary carbonate

On the other hand, the strength is too low, and it is easy to coagulate and agglomerate during spray drying process, which seriously affects the redispersibility of redispersible latex powder. According to the data given by Chuang Yao Biological Technology Co., Ltd., the strength of the emulsion is at least 5 degrees Celsius, which is beneficial to the drying and powdering of the emulsion. This requires that in the selection process of monomers, the degree of hardness and hardness of the monomer can be observed in detail, and the optimum value of the emulsion can be adjusted by adjusting its proportions.

2 introduction of functional monomer

The introduction of functional monomer is another important factor affecting the properties of redispersible latex powder. When latex powder is used in later stage, polymer emulsion powder can be dispersed into emulsion after adding water, and film forming is the key of technology. Therefore, the key technical personnel of chuangyao Biotechnology Co., Ltd. proposed to introduce "water sensitive monomer" to make polymer latex particles hydrophilic and alkali sensitive, and ultimately improve the redispersibility of redispersible latex powder. (the main hydrophilic monomers include acrylic acid and methacrylic acid)

These monomers not only enhance the redispersibility of latex powder, but also reduce the water resistance of the redispersible film. Moreover, mixing with cement will inhibit the hydration of cement and affect the normal setting of cement.

The technical development team of chuangyao Biotechnology Co., Ltd. is working hard to solve these technical problems, and through a lot of continuous attempts, the water resistance of the film has been enhanced to a certain extent. We always believe that after continuous exploration, the relationship between redispersibility, water resistance and adhesion of redispersible latex powder will reach a perfect level.