News Details
Type I water-based epoxy paint crosslinking agent
2017-8-16 11:41:58
Type I water-based epoxy paint crosslinking agent
The first successful type I water-based epoxy crosslinking agent is Casmide360 and its modified product Casmide362. With low molecular weight epoxy resin reaction with more ethylene amine to produce the polyamine - epoxy adduct, then through single epoxy compounds to end, with acetic acid and part of the secondary amine, to adjust the HLB of crosslinking agent, in order to reduce the type I waterborne epoxy crosslinking agent of reactivity, apply for longer periods.
TaoYongZhong etc are low molecular weight liquid epoxy resin (E51) and polyethylene glycol reacts end epoxy compound, and then react with triethylene tetramine amino epoxy - amine adduct generated end, with a single epoxy compounds, with acetic acid and salt, finally obtained the I type water-borne epoxy crosslinking agent.
Due to the introduction of long chain polyethylene glycol, the crosslinking density was reduced and the film flexibility was improved. Becker et al. used epoxy resin and polyethylene glycol reaction to generate the end epoxide, and then the reaction with the phthalamide, which was sealed with salt to get the crosslinking agent product.
Epoxy resin with the linear structure of the thermoplastic heated solid to liquid, high viscosity is a low viscosity, only used with crosslinking agent has practical value (pure one-component waterborne epoxy system also need to join the latent type cross-linking agent). Therefore, the water-based epoxy system should contain waterborne epoxy resin and water-based epoxy crosslinking agent, and they can form three kinds of water dispersion form through different water-based approaches.
The resins can form three kinds of water dispersion forms through different water-based channels. The dispersion type of micelle; (3) emulsion.
Therefore, the water-based epoxy system has more choice combinations (theoretically nine types of morphological combinations), but also increases the difficulty of selection. In practical application process, at the same time by adding a large number of fillers, additives, etc., improve the application of waterborne epoxy system performance also cover up the deficiencies of waterborne epoxy system and even serious defects, it will increase more uncertainty and complexity.
Your, focus on waterborne epoxy resin respectively form and form of waterborne epoxy crosslinking agent at the same time, through the control of the nature of the waterborne epoxy and water-borne epoxy evaluation to achieve faster and better choice of waterborne epoxy system, everything must firmly foundation for you!
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
The first successful type I water-based epoxy crosslinking agent is Casmide360 and its modified product Casmide362. With low molecular weight epoxy resin reaction with more ethylene amine to produce the polyamine - epoxy adduct, then through single epoxy compounds to end, with acetic acid and part of the secondary amine, to adjust the HLB of crosslinking agent, in order to reduce the type I waterborne epoxy crosslinking agent of reactivity, apply for longer periods.
TaoYongZhong etc are low molecular weight liquid epoxy resin (E51) and polyethylene glycol reacts end epoxy compound, and then react with triethylene tetramine amino epoxy - amine adduct generated end, with a single epoxy compounds, with acetic acid and salt, finally obtained the I type water-borne epoxy crosslinking agent.
Due to the introduction of long chain polyethylene glycol, the crosslinking density was reduced and the film flexibility was improved. Becker et al. used epoxy resin and polyethylene glycol reaction to generate the end epoxide, and then the reaction with the phthalamide, which was sealed with salt to get the crosslinking agent product.
Epoxy resin with the linear structure of the thermoplastic heated solid to liquid, high viscosity is a low viscosity, only used with crosslinking agent has practical value (pure one-component waterborne epoxy system also need to join the latent type cross-linking agent). Therefore, the water-based epoxy system should contain waterborne epoxy resin and water-based epoxy crosslinking agent, and they can form three kinds of water dispersion form through different water-based approaches.
The resins can form three kinds of water dispersion forms through different water-based channels. The dispersion type of micelle; (3) emulsion.
Therefore, the water-based epoxy system has more choice combinations (theoretically nine types of morphological combinations), but also increases the difficulty of selection. In practical application process, at the same time by adding a large number of fillers, additives, etc., improve the application of waterborne epoxy system performance also cover up the deficiencies of waterborne epoxy system and even serious defects, it will increase more uncertainty and complexity.
Your, focus on waterborne epoxy resin respectively form and form of waterborne epoxy crosslinking agent at the same time, through the control of the nature of the waterborne epoxy and water-borne epoxy evaluation to achieve faster and better choice of waterborne epoxy system, everything must firmly foundation for you!
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
No matter which kind of form selection of waterborne epoxy resin and water-borne epoxy crosslinking agent, finally has practical application value of waterborne epoxy system is a kind of dispersed multiphase structure, composed of waterborne epoxy resin, water-borne epoxy crosslinking agent, such as water multiphase composition, its mechanism of membrane is different from the general polymer emulsion acrylic emulsion as film forming (condenses into membrane, physical process), and at the same time and solvent epoxy film is not entirely the same.
In solvent epoxy system, epoxy resin and the crosslinking agent are in the form of molecules dissolved in organic solvent, the formation of the system is homogeneous, the crosslinking reaction between the molecules, thus crosslinking reaction more fully, formed by crosslinking is homogeneous.
Water-based epoxy for multiphase system, epoxy resins and crosslinking agent in the form of the dispersed phase dispersed in the water phase, cross-linking cross-linking process is in the process of evaporation of water particles between the mutual penetration of internal diffusion of crosslinking reaction process, therefore, waterborne epoxy crosslinking degree depends on the following factors:
The better compatibility of waterborne epoxy resin with water-based epoxy crosslinking agent, the better the interflow of crosslinking particles and epoxy particles is beneficial to the crosslinking reaction.
The particle size is less than an hour, and the dispersed phase particles of waterborne epoxy resin and water-based epoxy crosslinking agent can penetrate into the core more fully to achieve the complete crosslinking degree.
In the process of particle fusion, the theory is generally explained by Nix and Dodge equation. They believe that the surface tension is the only factor of fusion and leveling of a fixed composition of powder coating. According to this hypothesis, the two particles fuse together with the melt viscosity (mu) and the curvature radius/surface tension (Rc/gamma) of the particle. Equations as follows t ∝ mu Rc/gamma
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
No matter which kind of form selection of waterborne epoxy resin and water-borne epoxy crosslinking agent, finally has practical application value of waterborne epoxy system is a kind of dispersed multiphase structure, composed of waterborne epoxy resin, water-borne epoxy crosslinking agent, such as water multiphase composition, its mechanism of membrane is different from the general polymer emulsion acrylic emulsion as film forming (condenses into membrane, physical process), and at the same time and solvent epoxy film is not entirely the same.
In solvent epoxy system, epoxy resin and the crosslinking agent are in the form of molecules dissolved in organic solvent, the formation of the system is homogeneous, the crosslinking reaction between the molecules, thus crosslinking reaction more fully, formed by crosslinking is homogeneous.
Water-based epoxy for multiphase system, epoxy resins and crosslinking agent in the form of the dispersed phase dispersed in the water phase, cross-linking cross-linking process is in the process of evaporation of water particles between the mutual penetration of internal diffusion of crosslinking reaction process, therefore, waterborne epoxy crosslinking degree depends on the following factors:
The better compatibility of waterborne epoxy resin with water-based epoxy crosslinking agent, the better the interflow of crosslinking particles and epoxy particles is beneficial to the crosslinking reaction.
The particle size is less than an hour, and the dispersed phase particles of waterborne epoxy resin and water-based epoxy crosslinking agent can penetrate into the core more fully to achieve the complete crosslinking degree.
In the process of particle fusion, the theory is generally explained by Nix and Dodge equation. They believe that the surface tension is the only factor of fusion and leveling of a fixed composition of powder coating. According to this hypothesis, the two particles fuse together with the melt viscosity (mu) and the curvature radius/surface tension (Rc/gamma) of the particle. Equations as follows t ∝ mu Rc/gamma
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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