Acrylic latex paint crosslinking agent

Acrylic latex paint crosslinking agent. Crosslinking is an important means to improve the performance of water, heat resistant, anti-fouling and mechanical strength of latex paint. Room temperature crosslinking is not required for baking, and is valued for ease of use.

Literature reports, the use of diacetone acrylamide (DAAM) as crosslinking monomer, multivariate hydrazide (mainly for adipic hydrazine) as crosslinking agent of room temperature crosslinking latex paint has excellent water resistance and weather resistance, resistant to dirty. The recommended emulsion polymerization process is a non-soap emulsion polymerization process with reactive emulsifier.

Preparation for this, this paper adopts the polymerization process with DAAM as crosslinking monomer and adipic hydrazine as the crosslinking agent of crosslinking acrylic emulsion paint were studied at room temperature, and using the soap and conventional emulsion polymerization process are compared.

The synthesis of a carbonyl acrylic emulsion. The reactive emulsifiers used in non-soap emulsion polymerization are the complex of RN - 30 and hs-10. The emulsifier for microsoap emulsion polymerization is DSB. The emulsifiers used in regular emulsion polymerization are the compound of the op-10 and DSB.

Titanium dioxide, dispersing agent and deionized water in 500 ml of sand mill grinding 1 h, with 200 mesh sieve after filtering, the white pulp obtained emulsion, crosslinking agent and film-forming agent and defoaming agent, beaten, with a small amount of thickening agent thickening finally to 60 s viscosity products.

Performance testing of emulsion and coating. Latex particle size and size distribution by UK Ma lvern company Ze tasizer 3000 hs laser particle size measurement, Z - all were separately measured number average particle diameter, particle size and particle size, expressed in dz, dn and dv. Measuring temperature is 25 ℃.

The surface tension is determined by the ring method. The device is a DCAT21 surface/interfacial tension meter produced by Germany D ataphysics company. Emulsion of foamability, follow these steps to determine: take 2 g emulsion and 10 g deionized water, into the colorimetric tube 20 cm long, strong oscillation in 1 m, let stand, record the height of the bubble, generally repeat 3 times.

The effect of DAAM on film performance. DAAM as crosslinking monomer, the dosage is determined by the crosslinking density and properties of the coating, examining the dosage of the conventional emulsion polymerization process on the properties of room temperature crosslinking emulsioni paint. Join DAAM can obviously improve gloss, solvent resistance of the coating (crosslinking degree increase means coating resistant to improve the performance of toluene and other solvents) and hardness (glass transition temperature increase).




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Raw material ：

TDA industrial, Sichuan production

Ethylene (Et) polymer grade, Shanghai production

TEA industrial imports

A reagent grade additives


With the increase of dosage of DAAM, solvent resistance, water resistance of coating (expressed in the bibulous rate of emulsion membrane membrane water resistance, bibulous rate is larger, the more the resistance to water of membrane) has improved significantly. When DAAM consumes about 6.5 percent of the total mass, the coating is the best. The experiment determined that the DAAM dose was 6.5% of the total mass.

The effect of DAAM on the absorption rate of regular emulsion membrane. The polymerization stability of microsoap emulsion polymerization and the chemical stability of emulsion are poor, and the polymerization stability of non-soap emulsion polymerization is slightly worse than that of conventional emulsion polymerization.

Soap-free emulsion latex particle size of the fine, but the particle size distribution is wide, micro soap-free emulsion and conventional emulsion latex particle size close, a little rough in soap-free emulsion, but narrow particle size distribution. The solid content of regular emulsion is higher, and the solid content of non-soap emulsion is low, and the solids of microsoap emulsion are in between.

The effect of polymerization process on the absorption rate of emulsion film. Soap-free emulsion membrane and soap emulsion membrane bibulous rate is obviously lower than that of conventional emulsion membrane, the soap-free emulsion membrane and soap emulsion film good water resistance of the conventional emulsion film.

Experiment also found that the conventional emulsion membrane 48 h bibulous rate is only 10%, excellent water resistance, were improved significantly crosslinking emulsion membrane resistance to water (normal non crosslinked emulsion membrane 48 h bibulous rate is greater than 20%).

Water resistance is all emulsion products one of the most important performance indexes, from this point of consideration, DAAM as crosslinking monomer and adipic hydrazine as the crosslinking agent of ambient crosslinking acrylic emulsion shows a good application prospect.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com