Adhesives and Emulsions
In addition to building glue, PVA can also be combined with other chemical raw materials to make a variety of use adhesives, or as a protective colloid production of white latex, mainly used in paper, wood, textiles, office glue and high-grade paint base materials. In 2009, the field of PVA accounted for about 11% of the total consumption.
In addition to low white latex technology content, through the various high-end adhesives, all have a high technical content, high value-added products. Users are mainly national starch, Henkel, Wacker and other well-known foreign-funded enterprises, the need for PVA to part of the product mainly alcohol solutions, such as pva17-88, pva24-88 and so on. Users in this area are mainly concentrated in South China, especially in Jiangsu, Zhejiang, Fujian and Guangdong.
The main role of PVA in PVAc emulsion manufacturing is that PVA has a very low surface tension, which can disperse the vac into fine particles in water, and PVA is a good protective colloid, so that the pvac of the colloidal state particles has been polymerized to form a water emulsion stable and will not agglomerate and deteriorate. Use should be based on the nature of the requirements of the product selection of PVA model. Early production. the latex with higher adhesion force can be used as the main body of PVA, such as 24-99, 18-99, 20-99 and 17-99. Low viscosity and high solid content latex can be produced with a low degree of polymerization PVA and high alcohol solution PVA.