Selection of latex paint film-forming additives

Due to increasing regulatory restrictions on volatile organic compounds from coatings, the resulting Water-based systems for growth development. Much research and development has been devoted to water-based coatings based on emulsions for use in furniture, kitchen appliances, plastics, maintenance and other industrial applications. All of these use film-forming additives to promote film formation. At application temperatures, they reduce the stiffness modulus of the polymer, imparting viscous flow and melting of the emulsion particles. In a sense, film-forming aids are temporary A plasticizer that softens the emulsion particles to form a film and then evaporates from the film.

Products used as film-forming aids: aromatic hydrocarbons, glycols, alcohol ethers, alcohol ether esters, esters, ester alcohols

When selecting appropriate film-forming additives, several factors must be considered when formulating. One factor is the evaporation rate. Coagulated emulsion film-forming materials are available in a wide range of volatilization rates, from alcohol ethers that volatilize quickly to solvents that volatilize slowly,For example, Texanol ester alcohol (2,2,4-trimethyl-1,3-glutaric acid monoisobutyl ester) and diethylene glycol butyl ether acetate.

Volatilization rate of film-forming additives

Film-forming additives

Stability of film-forming additives in high pH emulsions

Film-forming aids	Structure	Film-forming additives in the emulsion%	Initial PH	PH after aging
—	—	0	9.18	8.8
Texanol	Ester alcohol	10.5	9.1	8.75
DBE	Diesester	10.5	9.1	5.0
Diethylene glycol butyl ether acetate	ether ester	10.5	9.1	5.85

For latex paints with low pH, DB acetate is widely used as a film-forming additive, but it is not recommended for latex with high pH. Paint is due to ester-based Stability is very poor.

References :Chemical Encyclopedia Chemical Raw Materials Chemical Applications Fine Chemicals Coatings and Paints

, 51, 51); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255); letter-spacing: 0.544px; font-family: Microsoft YaHei, 'Microsoft YaHei' ; font-size: 16px;">

For latex paints with low pH, DB acetate is widely used as a Membrane additive, but not recommended for latex with high pHpaint, due to the poor stability of the ester base.

References :Chemical Encyclopedia Chemical Raw Materials Chemical Applications Fine Chemicals Coatings and Paints

This article is from the Internet, does not represent the position of Epoxy curing agent, reproduced please specify the source.https://www.dmp-30.vip/archives/26281