News Details
Crosslinking agent for emulsion coating
2017-7-14 16:11:37
Crosslinking agent for emulsion coating
At present, the theory and application of waterborne coatings have made great progress, the application scope has been expanded, the quality of coating products has been improved, which has taken a big step in the direction of low pollution, environment and sustainable development.
The most noteworthy of waterborne coatings is emulsion coatings and aqueous dispersions. In fact, the emulsion coating is also considered to be an aqueous dispersion of the polymer particles prepared by the emulsion polymerization process.
Crosslinking agent for emulsion coating: Amino resin crosslinking agent. From the 1950s to the present, methanol etherified amino resin is the most important cross-linking agent for aqueous hydroxyl-containing acrylic resins. The crosslinking is carried out by condensation of an acrylamide group in an acrylic resin with an amino resin such as hexamethoxymethylmelamine (HMMM).
The addition of 2% to 4% N-methylolacrylamide or N-isobutoxy methacrylamide in the comonomer of the acrylic resin contributes to the improvement of the crosslinking speed and improves the film properties.
(Cross-linking temperature> 120 ℃, cross-linking time> 15min) for the automotive coatings or industrial coatings, the development of high temperature cross-linked amino resin crosslinking agent is developed. The addition of a catalyst (such as p-toluenesulfonic acid) reduces the crosslinking temperature and increases the rate of crosslinking, but reduces storage stability.
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
At present, the theory and application of waterborne coatings have made great progress, the application scope has been expanded, the quality of coating products has been improved, which has taken a big step in the direction of low pollution, environment and sustainable development.
The most noteworthy of waterborne coatings is emulsion coatings and aqueous dispersions. In fact, the emulsion coating is also considered to be an aqueous dispersion of the polymer particles prepared by the emulsion polymerization process.
Crosslinking agent for emulsion coating: Amino resin crosslinking agent. From the 1950s to the present, methanol etherified amino resin is the most important cross-linking agent for aqueous hydroxyl-containing acrylic resins. The crosslinking is carried out by condensation of an acrylamide group in an acrylic resin with an amino resin such as hexamethoxymethylmelamine (HMMM).
The addition of 2% to 4% N-methylolacrylamide or N-isobutoxy methacrylamide in the comonomer of the acrylic resin contributes to the improvement of the crosslinking speed and improves the film properties.
(Cross-linking temperature> 120 ℃, cross-linking time> 15min) for the automotive coatings or industrial coatings, the development of high temperature cross-linked amino resin crosslinking agent is developed. The addition of a catalyst (such as p-toluenesulfonic acid) reduces the crosslinking temperature and increases the rate of crosslinking, but reduces storage stability.
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 agent for emulsion coatings: zinc and zirconium crosslinking agents. Zinc salt is the first non-formaldehyde type emulsion coating crosslinker to be developed in 1965 for use in carboxylic acid-containing aqueous dispersions. The advantage is to provide a stable single package coating, can be room temperature crosslinking, and an excellent film hardness and water resistance. Zirconium salt can be crosslinked with carboxylic acid-containing acrylic resin, also has a good film performance.
Pesticide used in the application of ammonium azide can be used for water-based paint, a good heat resistance, scratch resistance and water resistance.
Emulsion film coating process. Emulsion coating from the emulsion of emulsion dispersion to the process of film formation, generally divided into three steps, that is, the first step of water evaporation, latex particles closely packed;
Step 2 The particles are deformed and the stack is more compact at the temperature (T) than the minimum film-forming temperature (MFT). Step 3 is aged at a temperature greater than the glass transition temperature (Tg) of the polymer, Performance of the film.
To design and formulate the best performance and environment-friendly emulsion coating, we must study the basic principles, interrelations and effects of film formation and crosslinking of emulsion coatings, as well as the relationship between cross-linking and crosslinking rates Balance and its effect on film properties.
In 1912 KurtGottlob received the first patent on diolefin emulsion polymerization. 20 years later Luther and Hueck received another patent for emulsion polymerization. Then Gottlob, Luther and Hueck began to study the crosslinking and film formation of emulsion coatings.
In the late 1930s, solvent-based melamine resin crosslinking agents were developed and used in acrylic emulsions in the 1950s. From 1940 to 1950, the styrene-butadiene emulsion was first commercialized, and Flory, Rehner, Harkins, Smith and Ewart et al. Made a pioneering study of emulsion polymerization, gelation and swelling networks.
1950 - 1960, AC-33 pure acrylic emulsion, UCARWC-130 vinyl acetate emulsion, acrylic emulsion, have been industrialized. With respect to the film formation of the emulsion, Bradford proposed the theory of surface tension, Brown proposed capillary push force theory. 1960-1970, Rodgers introduced formaldehyde-free zinc salt crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Crosslinking agent for emulsion coatings: zinc and zirconium crosslinking agents. Zinc salt is the first non-formaldehyde type emulsion coating crosslinker to be developed in 1965 for use in carboxylic acid-containing aqueous dispersions. The advantage is to provide a stable single package coating, can be room temperature crosslinking, and an excellent film hardness and water resistance. Zirconium salt can be crosslinked with carboxylic acid-containing acrylic resin, also has a good film performance.
Pesticide used in the application of ammonium azide can be used for water-based paint, a good heat resistance, scratch resistance and water resistance.
Emulsion film coating process. Emulsion coating from the emulsion of emulsion dispersion to the process of film formation, generally divided into three steps, that is, the first step of water evaporation, latex particles closely packed;
Step 2 The particles are deformed and the stack is more compact at the temperature (T) than the minimum film-forming temperature (MFT). Step 3 is aged at a temperature greater than the glass transition temperature (Tg) of the polymer, Performance of the film.
To design and formulate the best performance and environment-friendly emulsion coating, we must study the basic principles, interrelations and effects of film formation and crosslinking of emulsion coatings, as well as the relationship between cross-linking and crosslinking rates Balance and its effect on film properties.
In 1912 KurtGottlob received the first patent on diolefin emulsion polymerization. 20 years later Luther and Hueck received another patent for emulsion polymerization. Then Gottlob, Luther and Hueck began to study the crosslinking and film formation of emulsion coatings.
In the late 1930s, solvent-based melamine resin crosslinking agents were developed and used in acrylic emulsions in the 1950s. From 1940 to 1950, the styrene-butadiene emulsion was first commercialized, and Flory, Rehner, Harkins, Smith and Ewart et al. Made a pioneering study of emulsion polymerization, gelation and swelling networks.
1950 - 1960, AC-33 pure acrylic emulsion, UCARWC-130 vinyl acetate emulsion, acrylic emulsion, have been industrialized. With respect to the film formation of the emulsion, Bradford proposed the theory of surface tension, Brown proposed capillary push force theory. 1960-1970, Rodgers introduced formaldehyde-free zinc salt crosslinking agent.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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