The nitrile latex manufacturer will show you the factors that affect the performance of carboxylated styrene-butadiene latex.

The production process of SBR latex for lawn is a lotion polymerization process. The lotion polymer of latex is very complex, including many kinds of monomers, regulators, surfactants, and initiators. The properties of styrene-butadiene latex are not only affected by polymerization conditions, but also by the proportion of styrene and butadiene. When the content of styrene increases, the plasticity and hardness of the latex increase, and higher pressure and temperature are required for calendering, so that the paper with high glossiness, smoothness and good film forming performance can be pressed, but the adhesion and stability of the coating decrease.

The carboxyl group has a strong activity. With the increase of the carboxylation degree of latex, the shear viscosity and water retention of coated paper will also improve. However, under the action of high shear force, the coating shows the characteristics of shear thinning, which will be very suitable for high-speed scraper coating. In the synthesis of carboxylated styrene-butadiene latex, monomers such as nitriles, amides and esters are added or monomers containing carboxyl groups are added to improve the properties of the latex.

If the glass transition temperature is high, the latex film is relatively hard. The glass transition temperature of the polymer has a great impact on its flexibility. The coating prepared with low glass transition temperature latex can improve the cushioning of the coated paper and make the paper have good printability.

The crosslinking degree Gel of carboxylated styrene-butadiene latex is affected by its pH value. If the Gel value is high, the printing gloss and dry roughing strength of coated paper are high, but its anti-foaming (vacuum packaging) and wet roughing strength become poor. 2.4 The use of special emulsifiers, some with molecular weight of 5000~1 0000, can significantly improve the wateriness of the latex adhesive, reduce the content of coagulates, and improve the smoothness of the coating.