News Details
Paint acrylic resin crosslinking agent
2017-5-7 15:37:51
Paint acrylic resin crosslinking agent.Acrylic resin emulsion as the most widely used currently, one of the most important water paint binders, excellent light color retention, weathering resistance and fullness, but pure acrylic emulsion coating hardness, normal temperature or low temperature construction film-forming properties and chemical resistant performance is not ideal, affecting the application range of it as a high-grade water-based paint.
Therefore, various cross-linking modification methods are required to modify the polymer structure to improve the overall performance of the polymer.
Melamine is also called melamine, which is a kind of very important chemical intermediates, due to its intramolecular containing nitrogen heterocyclic, therefore with its synthesized from melamine formaldehyde resin has higher reactivity, and has low viscosity, high crosslinking activity and excellent miscibility and is widely used in a variety of coating adhesive of crosslinking agent and wood processing.
But as a result of melamine formaldehyde resin are widespread poor water soluble, low solid content, aging resistance and free formaldehyde content is higher, make its application in the environmentally friendly water-based coatings is limited.
Therefore, this study of the melamine formaldehyde by methanol etherification modification, low viscosity, low formaldehyde, soluble in water and soluble in organic solvent crosslinking products, and in different proportion and distribution of acrylic resin emulsion, in the process of high temperature film, as the system of evaporation of water molecules, the molecules of the crosslinking agent, methoxy or hydroxyl methyl with the polar groups formed in the acrylic resin crosslinking structure resulting from the physical or chemical combination, improve the resin emulsion film after each performance.
The main raw material of the experiment. Formaldehyde: analytical pure, content 37.0% ~ 40.0%; Methanol: analytical, 99.5%; Melamine: chemical purity, 99.0%; Sodium hydroxide: the analysis is pure, the content is greater than 96.0%; Hydrochloric acid: analytical pure, content: 36.0% ~ 38%. Acrylic resin emulsion (PA).
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Physical performance of modified PAM emulsion. The surface tension and viscosity of the modified emulsion were decreased with the amount of crosslinking agent, and the maximum value was when R was 5. The reason may be due to content is low (R < 5), the addition of crosslinking agent changed the original PA emulsion particle interaction, for the coupling effect between particles, strengthen, which in turn limit its ability to freedom of movement, increase viscosity.
At the same time as crosslinking agent of amino and hydroxyl are polar group, adding PA emulsion particles of emulsion increased after polarity, so with the increase of the dosage of crosslinking agent, the surface tension of the modified emulsion is also a trend of increase. When R is greater than 5, with the sharp increase in the amount of crosslinking agent, PA system of each particle in the particle size increase, reduce the amount of hydration layer of the particle surface adsorption, equivalent to reduce the volume of the dispersed phase, so the system of the apparent viscosity and surface tension reducing instead.
The viscosity and surface tension of PAM emulsion for different crosslinking agents. The mechanical properties and water absorption rate of the modified PAM membrane. Compared with the modified coating of non-crosslinking agent, the tensile strength, modulus and hardness of the coating were increased, and the elongation rate of the fracture was decreased.
This is because the etherification melamine containing hydroxyl methyl and methoxyl and triazine ring structure, as a crosslinking agent is introduced in the PA emulsion, during high temperature drying crosslinking, ability and emulsion of polar group - OH, - COOH cross-linking polycondensation reaction, and can be a triazine ring structure and multiple polymer reaction, make PA macromolecular crosslinking between form network structure more compact space, increased the molecular chain of inter-atomic forces, boosting the molecular chain rigidity, tensile strength and the hardness of membrane increased significantly.
But with an increase in the amount of crosslinking agent, the molecular stated LianDian increases, the formation of polymer network structure is more and more dense, resulting in a decline in polymer crystallinity and orientation, into the membrane fusion, elongation at break decreases. Results show that in table 2 at the same time, the addition of crosslinking agent makes the original linear acrylic resin in the formation of crosslinked network structure to a certain extent, have obviously improved resistance to water.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Therefore, various cross-linking modification methods are required to modify the polymer structure to improve the overall performance of the polymer.
Melamine is also called melamine, which is a kind of very important chemical intermediates, due to its intramolecular containing nitrogen heterocyclic, therefore with its synthesized from melamine formaldehyde resin has higher reactivity, and has low viscosity, high crosslinking activity and excellent miscibility and is widely used in a variety of coating adhesive of crosslinking agent and wood processing.
But as a result of melamine formaldehyde resin are widespread poor water soluble, low solid content, aging resistance and free formaldehyde content is higher, make its application in the environmentally friendly water-based coatings is limited.
Therefore, this study of the melamine formaldehyde by methanol etherification modification, low viscosity, low formaldehyde, soluble in water and soluble in organic solvent crosslinking products, and in different proportion and distribution of acrylic resin emulsion, in the process of high temperature film, as the system of evaporation of water molecules, the molecules of the crosslinking agent, methoxy or hydroxyl methyl with the polar groups formed in the acrylic resin crosslinking structure resulting from the physical or chemical combination, improve the resin emulsion film after each performance.
The main raw material of the experiment. Formaldehyde: analytical pure, content 37.0% ~ 40.0%; Methanol: analytical, 99.5%; Melamine: chemical purity, 99.0%; Sodium hydroxide: the analysis is pure, the content is greater than 96.0%; Hydrochloric acid: analytical pure, content: 36.0% ~ 38%. Acrylic resin emulsion (PA).
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
Physical performance of modified PAM emulsion. The surface tension and viscosity of the modified emulsion were decreased with the amount of crosslinking agent, and the maximum value was when R was 5. The reason may be due to content is low (R < 5), the addition of crosslinking agent changed the original PA emulsion particle interaction, for the coupling effect between particles, strengthen, which in turn limit its ability to freedom of movement, increase viscosity.
At the same time as crosslinking agent of amino and hydroxyl are polar group, adding PA emulsion particles of emulsion increased after polarity, so with the increase of the dosage of crosslinking agent, the surface tension of the modified emulsion is also a trend of increase. When R is greater than 5, with the sharp increase in the amount of crosslinking agent, PA system of each particle in the particle size increase, reduce the amount of hydration layer of the particle surface adsorption, equivalent to reduce the volume of the dispersed phase, so the system of the apparent viscosity and surface tension reducing instead.
The viscosity and surface tension of PAM emulsion for different crosslinking agents. The mechanical properties and water absorption rate of the modified PAM membrane. Compared with the modified coating of non-crosslinking agent, the tensile strength, modulus and hardness of the coating were increased, and the elongation rate of the fracture was decreased.
This is because the etherification melamine containing hydroxyl methyl and methoxyl and triazine ring structure, as a crosslinking agent is introduced in the PA emulsion, during high temperature drying crosslinking, ability and emulsion of polar group - OH, - COOH cross-linking polycondensation reaction, and can be a triazine ring structure and multiple polymer reaction, make PA macromolecular crosslinking between form network structure more compact space, increased the molecular chain of inter-atomic forces, boosting the molecular chain rigidity, tensile strength and the hardness of membrane increased significantly.
But with an increase in the amount of crosslinking agent, the molecular stated LianDian increases, the formation of polymer network structure is more and more dense, resulting in a decline in polymer crystallinity and orientation, into the membrane fusion, elongation at break decreases. Results show that in table 2 at the same time, the addition of crosslinking agent makes the original linear acrylic resin in the formation of crosslinked network structure to a certain extent, have obviously improved resistance to water.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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