News Details
Latex paint (paint) crosslinking agent
2017-5-31 17:14:48
Latex paint (paint) crosslinking agent
The effect of soft/hard monomer composition and proportion. The formula of emulsion polymerization must be designed for performance and price. Thus, according to wood coatings with polyacrylate emulsion performance requirements, raw material sources and prices etc., choose MMA and St as hard monomer, give the film gloss, hardness, wear resistance, high cohesion and structural strength; Use BA as the soft monomer, reduce the film temperature of emulsion, give the coating a certain flexibility and durability.
According to the ratio of soft/hard monomer, the temperature Tg can be estimated by the Gibbs Dimarzio equation. Tg high emulsion, the hard unit dosage is big, the emulsion is dry fast, the gloss is high, the hardness is high, the resistance to stain is good, the high temperature is not easy to return to stick, but the film temperature is high; On the other hand, the low Tg emulsion, soft monomer dosage, low film-forming temperature, emulsion film after mechanical performance degradation, paint film is soft and easy to be sticky, easy to scratch, the fouling resistance is not good.
The effects of soft/hard monomer ratio on the MFT and the resistance of paint film were investigated by using different soft/hard monomer ratio.
As the dosage of the soft monomer increases, the emulsion's MFT decreases, and the resistance to heat and pressure decreases. When the ratio of soft/hard monomer is constant, the MFT increases, the MFT increases, and the performance of heat resistance decreases.
This is because the MMA polarity is greater than the St, and the ratio of soft/hard monomer of constant and increasing St, macromolecular chain of MMA unit decrease relatively, molecular polarity is reduced, latex particle interaction between abate, MFT is high; Although St and MMA homopolymer Tg at 105 ℃, but the softening point of polystyrene (70 ~ 80 ℃) was lower than that of poly (methyl methacrylate, therefore increase the dosage of St, coating at high temperature, easy to soften sticky hot pressing performance variation. Considering m (MMA) : m (St) : m (BA) = 34:36:28 is the most suitable price for performance.
DAAM adds quantity and method. In the previous discussion, the uncrosslinked paint membrane was subjected to thermoplastic behavior, which is related to the structure of the Tg and the emulsion particles.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Crosslinking is an important means to improve the performance of latex paint, and the research on the new crosslinking method has been taken seriously by domestic and foreign countries. Monomer DAAM is a special kind of function, the molecular structure of both containing vinyl, can with other vinyl monomer copolymerization, and containing ketone carbonyl, room temperature under the condition of no water can react with adipic hydrazine generated hydrazone crosslinking effect, and only when the dry emulsion system pH decline, ketone carbonyl and hydrazide produces crosslinking reaction so as to realize the crosslinking of polymer emulsion, it's for the preparation of single component packaging, good storage stability, room temperature can be crosslinked polymer emulsion.
The application of DAAM as a crosslinking monomer for preparation of the polymer emulsion was studied, and the effect of the addition of DAAM on the properties of the latex film was investigated.
With the increase of the amount of DAAM, latex MFT, hot pressing performance is good, this is because the ADH with DAAM ketone carbonyl in latex particle surface crosslinking reaction, contribute to the improvement of the performance of the emulsion film, and the formation of crosslinked structure also limits the thermal motion of macromolecule chain, improve the resistance to deformation ability of the coating and the cohesive strength, the more dosage of DAAM, crosslinking density, the greater the heat resisting pressure, the better performance, ability to resist to stick.
Because DAAM ketone carbonyl reaction between ADH and homogeneous reaction, only when ketone carbonyl a lot in the surface layer of the latex particles can be effectively used, therefore DAAM join way has important influence on the performance of the emulsion and film.
When add quantity is constant, only change the way to join, improve DAAM in shell phase) on the film performance is improved and the improvement of the performance of the hot pressing, because join DAAM on shell stage, reduce the degree of its was encased within the latex particles, will make more ketone carbonyl exposed on the surface of latex particles, thus is advantageous to the crosslinking reaction and improve the degree of crosslinking.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The effect of soft/hard monomer composition and proportion. The formula of emulsion polymerization must be designed for performance and price. Thus, according to wood coatings with polyacrylate emulsion performance requirements, raw material sources and prices etc., choose MMA and St as hard monomer, give the film gloss, hardness, wear resistance, high cohesion and structural strength; Use BA as the soft monomer, reduce the film temperature of emulsion, give the coating a certain flexibility and durability.
According to the ratio of soft/hard monomer, the temperature Tg can be estimated by the Gibbs Dimarzio equation. Tg high emulsion, the hard unit dosage is big, the emulsion is dry fast, the gloss is high, the hardness is high, the resistance to stain is good, the high temperature is not easy to return to stick, but the film temperature is high; On the other hand, the low Tg emulsion, soft monomer dosage, low film-forming temperature, emulsion film after mechanical performance degradation, paint film is soft and easy to be sticky, easy to scratch, the fouling resistance is not good.
The effects of soft/hard monomer ratio on the MFT and the resistance of paint film were investigated by using different soft/hard monomer ratio.
As the dosage of the soft monomer increases, the emulsion's MFT decreases, and the resistance to heat and pressure decreases. When the ratio of soft/hard monomer is constant, the MFT increases, the MFT increases, and the performance of heat resistance decreases.
This is because the MMA polarity is greater than the St, and the ratio of soft/hard monomer of constant and increasing St, macromolecular chain of MMA unit decrease relatively, molecular polarity is reduced, latex particle interaction between abate, MFT is high; Although St and MMA homopolymer Tg at 105 ℃, but the softening point of polystyrene (70 ~ 80 ℃) was lower than that of poly (methyl methacrylate, therefore increase the dosage of St, coating at high temperature, easy to soften sticky hot pressing performance variation. Considering m (MMA) : m (St) : m (BA) = 34:36:28 is the most suitable price for performance.
DAAM adds quantity and method. In the previous discussion, the uncrosslinked paint membrane was subjected to thermoplastic behavior, which is related to the structure of the Tg and the emulsion particles.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Crosslinking is an important means to improve the performance of latex paint, and the research on the new crosslinking method has been taken seriously by domestic and foreign countries. Monomer DAAM is a special kind of function, the molecular structure of both containing vinyl, can with other vinyl monomer copolymerization, and containing ketone carbonyl, room temperature under the condition of no water can react with adipic hydrazine generated hydrazone crosslinking effect, and only when the dry emulsion system pH decline, ketone carbonyl and hydrazide produces crosslinking reaction so as to realize the crosslinking of polymer emulsion, it's for the preparation of single component packaging, good storage stability, room temperature can be crosslinked polymer emulsion.
The application of DAAM as a crosslinking monomer for preparation of the polymer emulsion was studied, and the effect of the addition of DAAM on the properties of the latex film was investigated.
With the increase of the amount of DAAM, latex MFT, hot pressing performance is good, this is because the ADH with DAAM ketone carbonyl in latex particle surface crosslinking reaction, contribute to the improvement of the performance of the emulsion film, and the formation of crosslinked structure also limits the thermal motion of macromolecule chain, improve the resistance to deformation ability of the coating and the cohesive strength, the more dosage of DAAM, crosslinking density, the greater the heat resisting pressure, the better performance, ability to resist to stick.
Because DAAM ketone carbonyl reaction between ADH and homogeneous reaction, only when ketone carbonyl a lot in the surface layer of the latex particles can be effectively used, therefore DAAM join way has important influence on the performance of the emulsion and film.
When add quantity is constant, only change the way to join, improve DAAM in shell phase) on the film performance is improved and the improvement of the performance of the hot pressing, because join DAAM on shell stage, reduce the degree of its was encased within the latex particles, will make more ketone carbonyl exposed on the surface of latex particles, thus is advantageous to the crosslinking reaction and improve the degree of crosslinking.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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