News Details
Research of coating crosslinking agent
2017-5-23 16:05:29
Research of coating crosslinking agent
This research adopts the semi-continuous emulsion polymerization to synthesize a kind of self-crosslinking acrylic emulsion with core-shell structure, determines the crosslinking monomer MAA, organic silicon monomer DAAM and monomer respectively 3%, 3% and 3% (mass fraction), the comprehensive performance of the emulsion is better, the solid content is 50%, viscosity of 315 mPa s., particle size is 93 nm. The emulsion can be used in the preparation of waterborne wood primers and paint, low VOC content, fast drying, coating has good fullness, polishing and transparency, such as performance, construction is convenient, spraying a bottom side can obtain good construction performance, shorten the construction time.
In order to obtain better performance of emulsion film and coating quality, we adopt the core-shell structure of emulsion polymerization, core-shell ratio is 1:1, design the nuclear part of Tg at 90 ℃, the shell part of Tg for - 10 ℃, and in the shell part, introduced a variety of crosslinking monomer and organic silicon monomer, so that the resin for the low film-forming temperature and coating high hardness, has better comprehensive performance. The effect of the amount of crosslinked monomer on the emulsion performance is discussed.
MAA's effect on emulsion performance. The introduction of a small amount of MAA in the polymerization reaction, to improve the stability of the emulsion polymerization, the adhesion between coating and substrate polarity and emulsion for yan, the wettability of filler.
Existing research shows that in the late of polymerization to join carboxylic monomers, can effectively restrain the homopolymerization in water phase, the carboxyl can be evenly distributed in the surface layer latex particle, the reaction of the emulsion stability, electrolyte stability and storage stability than other carboxylic monomers join way (polymerization stage before join or aggregation distribution stage to join) is better.
This paper studies the effect of MAA on polymerization and emulsion performance under the conditions of other polymerization processes.
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 addition of MAA, the polymerization stability increased, the viscosity increased, the film's film became more and more good, and the absorption of water first decreased. This is along with the increase in system of carboxyl, after alkali neutralization, into a strong hydrophilicity, COO, and latex particle surface charge density increased, micelle hydration layer and the stability of the electric double layer structure provides a better effect, latex enhanced grain of water-soluble and hydrogen bonding interaction, make originally in a random string, curled up carboxyl neutralization after completely stretch in water phase, lead to the emulsion viscosity rise significantly, but excessive viscosity can bring certain difficulty to stir reaction, affect the polymerization stability.
Strong hydrophilicity can also affect coating resistance to water, when the dosage of MAA is small, can be less crosslinking groups, coating crosslinking degree is relatively small, latex particles are arranged between the close degree is relatively low, emulsion poorly water-soluble, poor film-forming and relatively poor water resistance of coating; When the amount of MAA increased, the emulsion water-soluble, carboxyl and slightly crosslinked copolymer, to raise the density of coating and film forming property and water resistance is relatively improved.
When MAA usage continues to increase, the cross-linked group is more than that, and the corresponding amount of exposed water carboxylic acid is too much, which leads to the increase of the absorption rate of the coated membrane. Considering that MAA is used for 3 percent of the total amount of monomer, the film's overall performance is relatively good.
DMMA influences the performance of the emulsion. In this paper, the effect of DAAM dosage on emulsion performance was studied under the condition of the other polymerization process invariant and fixed DAAM and ADH.
The effect of DAAM dosage on emulsion performance. The use of DAAM is largely unaffected by the stability of the polymerization, and as the use of DAAM increases, the coating's water resistance, hardness, and adhesion are improved. This is because when the film as the moisture evaporation, system lower pH, ketone of DAAM and ADH hydrazine crosslinking reaction, to form crosslinked network structure, Tg hardness increased, the relative molecular mass of the polymer increases at the same time, beneficial to the improvement of the adhesion and coating compactness, limit the entering of small molecules of water; But DAAM adds too much, too much crosslinking density increases the inner stress of the membrane, causing the film to decline. In combination with the comprehensive performance and cost, the choice of DAAM is suitable for 3% of the total volume.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
This research adopts the semi-continuous emulsion polymerization to synthesize a kind of self-crosslinking acrylic emulsion with core-shell structure, determines the crosslinking monomer MAA, organic silicon monomer DAAM and monomer respectively 3%, 3% and 3% (mass fraction), the comprehensive performance of the emulsion is better, the solid content is 50%, viscosity of 315 mPa s., particle size is 93 nm. The emulsion can be used in the preparation of waterborne wood primers and paint, low VOC content, fast drying, coating has good fullness, polishing and transparency, such as performance, construction is convenient, spraying a bottom side can obtain good construction performance, shorten the construction time.
In order to obtain better performance of emulsion film and coating quality, we adopt the core-shell structure of emulsion polymerization, core-shell ratio is 1:1, design the nuclear part of Tg at 90 ℃, the shell part of Tg for - 10 ℃, and in the shell part, introduced a variety of crosslinking monomer and organic silicon monomer, so that the resin for the low film-forming temperature and coating high hardness, has better comprehensive performance. The effect of the amount of crosslinked monomer on the emulsion performance is discussed.
MAA's effect on emulsion performance. The introduction of a small amount of MAA in the polymerization reaction, to improve the stability of the emulsion polymerization, the adhesion between coating and substrate polarity and emulsion for yan, the wettability of filler.
Existing research shows that in the late of polymerization to join carboxylic monomers, can effectively restrain the homopolymerization in water phase, the carboxyl can be evenly distributed in the surface layer latex particle, the reaction of the emulsion stability, electrolyte stability and storage stability than other carboxylic monomers join way (polymerization stage before join or aggregation distribution stage to join) is better.
This paper studies the effect of MAA on polymerization and emulsion performance under the conditions of other polymerization processes.
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 addition of MAA, the polymerization stability increased, the viscosity increased, the film's film became more and more good, and the absorption of water first decreased. This is along with the increase in system of carboxyl, after alkali neutralization, into a strong hydrophilicity, COO, and latex particle surface charge density increased, micelle hydration layer and the stability of the electric double layer structure provides a better effect, latex enhanced grain of water-soluble and hydrogen bonding interaction, make originally in a random string, curled up carboxyl neutralization after completely stretch in water phase, lead to the emulsion viscosity rise significantly, but excessive viscosity can bring certain difficulty to stir reaction, affect the polymerization stability.
Strong hydrophilicity can also affect coating resistance to water, when the dosage of MAA is small, can be less crosslinking groups, coating crosslinking degree is relatively small, latex particles are arranged between the close degree is relatively low, emulsion poorly water-soluble, poor film-forming and relatively poor water resistance of coating; When the amount of MAA increased, the emulsion water-soluble, carboxyl and slightly crosslinked copolymer, to raise the density of coating and film forming property and water resistance is relatively improved.
When MAA usage continues to increase, the cross-linked group is more than that, and the corresponding amount of exposed water carboxylic acid is too much, which leads to the increase of the absorption rate of the coated membrane. Considering that MAA is used for 3 percent of the total amount of monomer, the film's overall performance is relatively good.
DMMA influences the performance of the emulsion. In this paper, the effect of DAAM dosage on emulsion performance was studied under the condition of the other polymerization process invariant and fixed DAAM and ADH.
The effect of DAAM dosage on emulsion performance. The use of DAAM is largely unaffected by the stability of the polymerization, and as the use of DAAM increases, the coating's water resistance, hardness, and adhesion are improved. This is because when the film as the moisture evaporation, system lower pH, ketone of DAAM and ADH hydrazine crosslinking reaction, to form crosslinked network structure, Tg hardness increased, the relative molecular mass of the polymer increases at the same time, beneficial to the improvement of the adhesion and coating compactness, limit the entering of small molecules of water; But DAAM adds too much, too much crosslinking density increases the inner stress of the membrane, causing the film to decline. In combination with the comprehensive performance and cost, the choice of DAAM is suitable for 3% of the total volume.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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