News Details
Coating organic silicon crosslinking agent
2017-5-25 11:47:58
Coating organic silicon crosslinking agent
In acrylate polymer molecular chain, the active siloxane groups is introduced in Si - O keys at room temperature can be hydrolyzed in water to form silicon, silicon alcohol with silanol condensation to form crosslinked network structure (Si - O - Si), improve the system of the crosslinking density, improve the density of coating; At the same time, silicone can be combined with the polar group on the substrate to improve the adhesion of the coating.
The effect of organosilicon monomer amount on emulsion performance. As the amount of organic silicon monomer increased, the polymerization stability of the emulsion decreased, the resistance to water was increased, and the membrane and antiadhesion were first improved and then decreased. This is due to the low surface energy, organic silicon monomer alkoxy chain in the hydrophobic molecular structure, molecular chain of siloxane chain water solution condensation occurs crosslinking, boosting the molecular chain of inter-atomic forces, hinder the infiltration between the water molecules to the polymer molecules, to improve the water resistance of coating, which reduces the water absorption.
When the amount of organic silicon monomer is small, the c-c = C - with acrylate monomer, the si-o bonds have relatively little hydrolysis, and the polymerization process is stable. With the increase of dosage, siloxane groups increased risk hydrolytic condensation reaction in polymerization process, polymerization stability decreased, the crosslink density of polymer increases, the relative molecular weight increased, the film-forming sex good, adhesion resistance increase.
The amount of organic silicon is too high, the crosslinking density is large, the movement of the molecular chain is restricted, the Tg of emulsion resin is raised, the hardness is raised, the film is reduced. Hydrolytic speed increase form gel at the same time, influence the stability of the polymerization reaction, caused the destruction of the latex particles structure, film-forming properties and adhesion resistance are decreased. According to the above results, the amount of organic silicone monomer is 1% (mass fraction).
Performance of waterborne wood paint main consideration is the adhesion and polishing, in this study the preparation of emulsion mixture of the primer is dry fast, good adhesion with substrate, polished easily, add a small amount of polishing agent, spray board after 2 h, with 600 waterproof abrasive paper manually polish 20 times, coating surface smooth level off, do not glue powder on the abrasive paper.
Latex solid content currently on the market at about 40%, mostly made of wood coatings in construction, generally by fullness, besmear brushs number to improve this study latex solid content of 50%, and the viscosity is not big, preparation of the primer coating on board a can achieve very good fullness, and has certain anti up reinforcement effect.
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
In this article, through the experiment found that with the increase of emulsion particle size, the fullness of the film will also increase, but too much of the increase of particle size would affect the coating film properties, such as sex and transparency. To make coating has good comprehensive performance, better particle size in 90 ~ 95 nm, also can be used in waterborne wood coatings emulsion paint film forming material, has the very good gloss and transparency.
Functional unit AA is affected by the method of joining. Add a small amount of in the emulsion polymerization formula containing carboxyl, hydroxyl, amino and unsaturated monomers, epoxy group and other functional groups can enhance the interaction between the copolymer molecular chain, even slight crosslinking reaction to generate a certain degree of network structure, thus improve the cohesion strength and mechanical properties of paint film, increase the adhesion between coating and substrate. By adding AA to improve the stability and bonding of the emulsion, it is determined that AA dosage is 2%, and the effect of the method on emulsion performance is investigated, and the results are shown in table 5.
In CPAE7, all other conditions are similar to CPAE3 except for AA, which is full of monomer, but the membrane performance of the emulsion is poor, the MFT is higher than the CPAE3, and the performance of the heat resistance is decreased. However, when the AA is fully integrated with shell monomer, the MFT is lower and the viscosity of the emulsion is greater, so the addition of AA can affect the emulsion performance greatly.
This is because the AA for hydrophilic monomer, polymerization reaction in aqueous phase, the join in a different way, carboxyl functional groups in the distribution of latex particles between the inner and outer will change too.
AA as shell monomer and join in and way, carboxyl functional groups will be more evenly distributed in exterior surface layer of latex particles, improve the latex particle surface polarity, curing film increased when the latex particle interactions that make MFT is reduced; The distribution of the carboxylic group on the surface of the emulsion, the chemical crosslinking reaction between ADH and ketocarbonyl group has also been promoted, and the resistance to heat and pressure has improved.
Using core-shell emulsion polymerization technology, the introduction of DAAM and ADH in polyacrylate emulsion, not only reduces the film-forming temperature of latex, and significantly improved the resistance to high temperature of latex paint sticky back, DAAM with AA to join has important influence on the performance of the emulsion. A suitable formula and process for: m (MMA) : m (St) : m (BA) : m (AA) : m (DAAM) = 34:36:28:2:3, DAAM with AA more by shell monomer to join as well.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
In acrylate polymer molecular chain, the active siloxane groups is introduced in Si - O keys at room temperature can be hydrolyzed in water to form silicon, silicon alcohol with silanol condensation to form crosslinked network structure (Si - O - Si), improve the system of the crosslinking density, improve the density of coating; At the same time, silicone can be combined with the polar group on the substrate to improve the adhesion of the coating.
The effect of organosilicon monomer amount on emulsion performance. As the amount of organic silicon monomer increased, the polymerization stability of the emulsion decreased, the resistance to water was increased, and the membrane and antiadhesion were first improved and then decreased. This is due to the low surface energy, organic silicon monomer alkoxy chain in the hydrophobic molecular structure, molecular chain of siloxane chain water solution condensation occurs crosslinking, boosting the molecular chain of inter-atomic forces, hinder the infiltration between the water molecules to the polymer molecules, to improve the water resistance of coating, which reduces the water absorption.
When the amount of organic silicon monomer is small, the c-c = C - with acrylate monomer, the si-o bonds have relatively little hydrolysis, and the polymerization process is stable. With the increase of dosage, siloxane groups increased risk hydrolytic condensation reaction in polymerization process, polymerization stability decreased, the crosslink density of polymer increases, the relative molecular weight increased, the film-forming sex good, adhesion resistance increase.
The amount of organic silicon is too high, the crosslinking density is large, the movement of the molecular chain is restricted, the Tg of emulsion resin is raised, the hardness is raised, the film is reduced. Hydrolytic speed increase form gel at the same time, influence the stability of the polymerization reaction, caused the destruction of the latex particles structure, film-forming properties and adhesion resistance are decreased. According to the above results, the amount of organic silicone monomer is 1% (mass fraction).
Performance of waterborne wood paint main consideration is the adhesion and polishing, in this study the preparation of emulsion mixture of the primer is dry fast, good adhesion with substrate, polished easily, add a small amount of polishing agent, spray board after 2 h, with 600 waterproof abrasive paper manually polish 20 times, coating surface smooth level off, do not glue powder on the abrasive paper.
Latex solid content currently on the market at about 40%, mostly made of wood coatings in construction, generally by fullness, besmear brushs number to improve this study latex solid content of 50%, and the viscosity is not big, preparation of the primer coating on board a can achieve very good fullness, and has certain anti up reinforcement effect.
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
In this article, through the experiment found that with the increase of emulsion particle size, the fullness of the film will also increase, but too much of the increase of particle size would affect the coating film properties, such as sex and transparency. To make coating has good comprehensive performance, better particle size in 90 ~ 95 nm, also can be used in waterborne wood coatings emulsion paint film forming material, has the very good gloss and transparency.
Functional unit AA is affected by the method of joining. Add a small amount of in the emulsion polymerization formula containing carboxyl, hydroxyl, amino and unsaturated monomers, epoxy group and other functional groups can enhance the interaction between the copolymer molecular chain, even slight crosslinking reaction to generate a certain degree of network structure, thus improve the cohesion strength and mechanical properties of paint film, increase the adhesion between coating and substrate. By adding AA to improve the stability and bonding of the emulsion, it is determined that AA dosage is 2%, and the effect of the method on emulsion performance is investigated, and the results are shown in table 5.
In CPAE7, all other conditions are similar to CPAE3 except for AA, which is full of monomer, but the membrane performance of the emulsion is poor, the MFT is higher than the CPAE3, and the performance of the heat resistance is decreased. However, when the AA is fully integrated with shell monomer, the MFT is lower and the viscosity of the emulsion is greater, so the addition of AA can affect the emulsion performance greatly.
This is because the AA for hydrophilic monomer, polymerization reaction in aqueous phase, the join in a different way, carboxyl functional groups in the distribution of latex particles between the inner and outer will change too.
AA as shell monomer and join in and way, carboxyl functional groups will be more evenly distributed in exterior surface layer of latex particles, improve the latex particle surface polarity, curing film increased when the latex particle interactions that make MFT is reduced; The distribution of the carboxylic group on the surface of the emulsion, the chemical crosslinking reaction between ADH and ketocarbonyl group has also been promoted, and the resistance to heat and pressure has improved.
Using core-shell emulsion polymerization technology, the introduction of DAAM and ADH in polyacrylate emulsion, not only reduces the film-forming temperature of latex, and significantly improved the resistance to high temperature of latex paint sticky back, DAAM with AA to join has important influence on the performance of the emulsion. A suitable formula and process for: m (MMA) : m (St) : m (BA) : m (AA) : m (DAAM) = 34:36:28:2:3, DAAM with AA more by shell monomer to join as well.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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