Synthesis And Properties Of Hollow Polymer Emulsion

Hollow is a special core-shell latex emulsion, generally it refers to prepared by emulsion polymerization with a cavity inside .Because of the hollow latex hollow structure, it has very different refractive index of light between shell polymer and the air cavity , scattering of incident light can be effective, which has a good covering effect and excellent whiteness. Multiple emulsion as an alternative to the current titanium hollow white plastic pigment used in paint, water-based inks, the field of low-weight coated paper. Moreover micro-capsules are also used as materials and UV additives. Since its inception in the eighties of last century, a good prospect of hollow latex aroused extensive attention.Semi-continuous dropping method was adopted to prepare hollow latex particles with moderate size and enough rigidity. Methyl methacrylate (MMA), butyl acrylate and methacrylic acid (MAA) were first copolymerized as seed latexes, and then MMA, MAA and divinyl benzene (DVB) were carried out to prepare hydrophilic carboxylated core latex particles consequently. On the basis of the core latex, the hydrophobic shell was then formed with styrene, MMA and DVB. Finally, the hollow emulsion were obtained by alkalization treatment of the core-shell latex particles. The effects of reaction temperature, MAA, emulsifier, cross-linked monomer, core/shell ratio and alkali treating on the emulsion stability and morphologies of hollow latex were investigated. The morphologies and particle sizes of hollow latex particles were characterized by TEM. The results show that the structure and properties of hollow emulsion is effected by the diameter and number of seeding emulsion, dosages of core/shell monomer, alkali treating, when core/shell ratio was 1:8, and counteract degree was 40%, the covering performance of hollow emulsion was the best and if it was more than the condition, covering power was going down. Meanwhile, the buildup of shell monomer also affects covering power greatly, when MAA mass ratio between seed monomer and core monomer is 28% and BA/ St mass ratio is 1/10, whiteness reaches tiptop, which is 94.40.In order to study the relationship between the performance of hollow emulsion structure and hiding power.This paper takes the Mie scattering theory , and simplified through the establishment of reasonable assumptions related to the physical model for the corresponding formula derivation and simplification, the use of MATLAB software programming and operation simulations. The results showed that the inner diameter of the hollow latex emulsion covering the size and performance-related.