News Details
Special functional coatings crosslinking agent
2017-4-6 11:16:58
Special functional coatings crosslinking agent,Quick crosslinking and low temperature crosslinking and the lowest water imbibition of the crosslinking agent has developed rapidly. Special function of crosslinking agent had the very big development, such as elastic crosslinking agent.
Due to the development of new structure and excellent performance of epoxy resin progress is not big, to meet the requirements for resins of function additives become a research focus, a dose of pluripotent products more and more.
The role of solvent in coatings are often not seriously for people, thought it is volatile, finally always volatilize instead of remaining in the coating film, so little effect on the quality of coating film. In fact, all kinds of force, the dissolution of solvent volatilization rate factors will greatly influence the oil paint production, storage, construction and coating film gloss, adhesion, surface state aspects of performance.
In the conventional liquid coating solvent volume accounted for about 30-50%. The main role of solvent in coatings: dissolved, dispersed resin in coatings, and adjust its viscosity and rheological property, make it easy to coating; Increase the paint storage stability; Improve the look of the film, such as gloss, fullness, etc. Increase the coating on the coated substrate wetting, improve adhesion; Of reasonable rate of volatile coating is best, given the liquidity and flow property;
Different resin series can only be dissolved in different active solvent, in the same oil paint formula, often use a variety of resin, so many kinds of active solvent can reach better effect.
Principle: in the active solvent to obtain the most stable performance and the best balance between, at the same time as much as possible to fill the solvent viscosity cost optimization and regulation construction.
Although in order to meet increasingly stringent environmental requirements, low VOC latex paint, water-based paint, UV light crosslinking coatings and powder coatings obtained rapid development, solvent coating with its performance and construction advantages are still occupies an important position in the field of coating. In order to make reasonable use of all kinds of solvents, in order to reach the balance between cost and performance, recommended the factory to the following place more attention on:
Solvent dissolving force of resin, can from dissolved into the dissolution rate of a certain concentration solution, viscosity and true solvent to populate the solvent tolerance (dilution ratio), etc.
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
"Similar miscibility" principle is the size of a judgment, solvent to material dissolved classical theory. The solubility parameters of similar miscibility.
Polymer dissolution process of general solvent molecules from smaller, starts slowly seep into the polymer chain and polymer molecules into solvent rate slower, so the first performance for the dissolution of polymer swelling volume, namely the swelling process. The dissolution of polymer in coating, of course, is a quite complex process, because of other components in the coating such as filler, pigments and additives will influence the dissolution degree of polymer. When choosing the main active solvent, we should consider the solubility parameters of polymer and solvent solubility parameters of the difference is less than 3, and hydrogen bonding force strength and similar solvent.
In the process of coating film, solvent constantly volatile out from the coating. Evaporation of the solvent performance has great influence on the final properties of the coatings, unsuitable evaporation rate will lead to coating defects, such as sagging, pinhole, shrinkage cavity and shrinkage, etc.
Temperature is one of the important factors affecting solvent evaporation rate, as the temperature, solvent evaporation rate was accelerated. This is the summer choose solvent volatilization rate slower more reasons, such as hot weather paint factory tend to use substitute partial toluene xylene.
The same type of solvent is corresponding to the boiling point and its relative volatility rate; But the boiling point and its relative evaporation rate of different kinds of solvent has no corresponding relation. Such as the boiling point of ethanol (79 ℃) was a little lower than the boiling point of benzene (80 ℃), but the relative evaporation rate of ethanol (1.6) is far below the relative volatility of benzene rate (6.3); Also the boiling point of n-butyl alcohol (117 ℃) than the boiling point of butyl acetate (127 ℃) is a bit low, but the relative evaporation rate of n-butyl alcohol (0.4) is far lower than the relatively volatile rate of butyl acetate (1.0). This was related with alcohols solvents containing strong hydrogen bonds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Due to the development of new structure and excellent performance of epoxy resin progress is not big, to meet the requirements for resins of function additives become a research focus, a dose of pluripotent products more and more.
The role of solvent in coatings are often not seriously for people, thought it is volatile, finally always volatilize instead of remaining in the coating film, so little effect on the quality of coating film. In fact, all kinds of force, the dissolution of solvent volatilization rate factors will greatly influence the oil paint production, storage, construction and coating film gloss, adhesion, surface state aspects of performance.
In the conventional liquid coating solvent volume accounted for about 30-50%. The main role of solvent in coatings: dissolved, dispersed resin in coatings, and adjust its viscosity and rheological property, make it easy to coating; Increase the paint storage stability; Improve the look of the film, such as gloss, fullness, etc. Increase the coating on the coated substrate wetting, improve adhesion; Of reasonable rate of volatile coating is best, given the liquidity and flow property;
Different resin series can only be dissolved in different active solvent, in the same oil paint formula, often use a variety of resin, so many kinds of active solvent can reach better effect.
Principle: in the active solvent to obtain the most stable performance and the best balance between, at the same time as much as possible to fill the solvent viscosity cost optimization and regulation construction.
Although in order to meet increasingly stringent environmental requirements, low VOC latex paint, water-based paint, UV light crosslinking coatings and powder coatings obtained rapid development, solvent coating with its performance and construction advantages are still occupies an important position in the field of coating. In order to make reasonable use of all kinds of solvents, in order to reach the balance between cost and performance, recommended the factory to the following place more attention on:
Solvent dissolving force of resin, can from dissolved into the dissolution rate of a certain concentration solution, viscosity and true solvent to populate the solvent tolerance (dilution ratio), etc.
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
"Similar miscibility" principle is the size of a judgment, solvent to material dissolved classical theory. The solubility parameters of similar miscibility.
Polymer dissolution process of general solvent molecules from smaller, starts slowly seep into the polymer chain and polymer molecules into solvent rate slower, so the first performance for the dissolution of polymer swelling volume, namely the swelling process. The dissolution of polymer in coating, of course, is a quite complex process, because of other components in the coating such as filler, pigments and additives will influence the dissolution degree of polymer. When choosing the main active solvent, we should consider the solubility parameters of polymer and solvent solubility parameters of the difference is less than 3, and hydrogen bonding force strength and similar solvent.
In the process of coating film, solvent constantly volatile out from the coating. Evaporation of the solvent performance has great influence on the final properties of the coatings, unsuitable evaporation rate will lead to coating defects, such as sagging, pinhole, shrinkage cavity and shrinkage, etc.
Temperature is one of the important factors affecting solvent evaporation rate, as the temperature, solvent evaporation rate was accelerated. This is the summer choose solvent volatilization rate slower more reasons, such as hot weather paint factory tend to use substitute partial toluene xylene.
The same type of solvent is corresponding to the boiling point and its relative volatility rate; But the boiling point and its relative evaporation rate of different kinds of solvent has no corresponding relation. Such as the boiling point of ethanol (79 ℃) was a little lower than the boiling point of benzene (80 ℃), but the relative evaporation rate of ethanol (1.6) is far below the relative volatility of benzene rate (6.3); Also the boiling point of n-butyl alcohol (117 ℃) than the boiling point of butyl acetate (127 ℃) is a bit low, but the relative evaporation rate of n-butyl alcohol (0.4) is far lower than the relatively volatile rate of butyl acetate (1.0). This was related with alcohols solvents containing strong hydrogen bonds.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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