News Details
Coating membrane crosslinking agent
2017-6-6 17:34:22
Coating membrane crosslinking agent
The film is also called a resin, adhesive or substrate. Said it will have a bond together to form the overall uniformity of coating components coating or coating, at the same time to the bottom of the substrate or coating wetting, penetration and interaction to generate the necessary adhesion, and basically meet the performance requirements of coatings (varnish or transparent coating is mainly composed of film forming matter), so the film forming matter is the basis of the coating composition.
Film-forming mechanism:
Physical means -- the solvent evaporates into the membrane
Traditional thermoplastic solvent coatings, such as chlorinated polyolefine, nitrocellulose, acrylic resin, CAB and PVF film forming matter dissolved in a solvent system preparation is less than 50% solid coating, the coating after installed membrane by the solvent evaporation. There are two stages of solvent evaporation:
In the first stage, when the film begins, the large molecules in the membrane are less affected by the evaporation of the solvent, and the main determinant is the vapor pressure of the solvent or the relative volatility of the international.
The second stage, with the solvent evaporation, and the viscosity of coating film is increased to a certain degree, the free volume decreases, and the solvent from spreading in the coating surface, solvent evaporation volatilizes into diffusion control by coating surface, volatile rate significantly slower. This stage may last for a long time.
The membrane of a polymer dispersion system
Polymer dispersed emulsion system including water as dispersion medium, as well as in the non-aqueous dispersion organosol, polymer insoluble in medium, to break up stable particles dispersed in the medium. Volatilizes into membrane dispersion medium, the capillary force and surface tension, driven by the emulsion particle boundary closely and deformation occurs, particle shell burst, interface between particles gradually disappear, the permeable polymer molecular chain and winding, forming a continuous uniform coating.
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
Chemistry is a membrane
A chemical reaction occurs in the membrane process, and the intermolecular crosslinking is produced by a continuous coating of a large molecule with a three-dimensional structure called a membrane. Crosslinking of chemical reactions may occur almost includes all chemical reactions in the film forming matter, according to the different requirements of film forming conditions and construction process, a normal temperature crosslinking, heating crosslinking, uv crosslinking type, there is also a one-component and double group into membrane method.
In general, a coating that is chemically formed is superior to that of the physical method. This kind of film forming matter is often referred to as thermosetting resins, in addition to the powder coating is that they are low molecular weight oligomer, construction viscosity is low, as the crosslinking density increases, the viscosity, the free volume decreases, and Tg increased, to generate continuous uniform solid coating.
Rosin resin is a kind of light color, highly polymerization (ii) polymerization of high softening point, high viscosity, and better oxidation resistance, and in the liquid state or in solution crystallization resistance completely, it's a variety of purposes including paint, desiccant, synthetic resin, auto ink, floor tile, rubber compound, flux, solder paste, as well as a variety of adhesives and protective coating.
Alkyd resin is modified polyester resin by polyol, phthalic anhydride and fatty acid or oil (triglycerides). The number and structure of double bonds in fatty acid (or oil) molecules can be classified into three categories: dry, semidry and non-dry.
Dry alkyd resin can be crosslinked in the air; Non-dry alkyd resin is mixed with amino resins, which can be crosslinked by heating. In addition, the content of the fatty acid (or oil) or phthalic anhydride, which can be divided into short, medium, long and very long four oil degrees of alkyd resin. The alkyd resin has a good quality of gloss and toughness, strong adhesion and good abrasion resistance, resistance and insulation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The film is also called a resin, adhesive or substrate. Said it will have a bond together to form the overall uniformity of coating components coating or coating, at the same time to the bottom of the substrate or coating wetting, penetration and interaction to generate the necessary adhesion, and basically meet the performance requirements of coatings (varnish or transparent coating is mainly composed of film forming matter), so the film forming matter is the basis of the coating composition.
Film-forming mechanism:
Physical means -- the solvent evaporates into the membrane
Traditional thermoplastic solvent coatings, such as chlorinated polyolefine, nitrocellulose, acrylic resin, CAB and PVF film forming matter dissolved in a solvent system preparation is less than 50% solid coating, the coating after installed membrane by the solvent evaporation. There are two stages of solvent evaporation:
In the first stage, when the film begins, the large molecules in the membrane are less affected by the evaporation of the solvent, and the main determinant is the vapor pressure of the solvent or the relative volatility of the international.
The second stage, with the solvent evaporation, and the viscosity of coating film is increased to a certain degree, the free volume decreases, and the solvent from spreading in the coating surface, solvent evaporation volatilizes into diffusion control by coating surface, volatile rate significantly slower. This stage may last for a long time.
The membrane of a polymer dispersion system
Polymer dispersed emulsion system including water as dispersion medium, as well as in the non-aqueous dispersion organosol, polymer insoluble in medium, to break up stable particles dispersed in the medium. Volatilizes into membrane dispersion medium, the capillary force and surface tension, driven by the emulsion particle boundary closely and deformation occurs, particle shell burst, interface between particles gradually disappear, the permeable polymer molecular chain and winding, forming a continuous uniform coating.
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
Chemistry is a membrane
A chemical reaction occurs in the membrane process, and the intermolecular crosslinking is produced by a continuous coating of a large molecule with a three-dimensional structure called a membrane. Crosslinking of chemical reactions may occur almost includes all chemical reactions in the film forming matter, according to the different requirements of film forming conditions and construction process, a normal temperature crosslinking, heating crosslinking, uv crosslinking type, there is also a one-component and double group into membrane method.
In general, a coating that is chemically formed is superior to that of the physical method. This kind of film forming matter is often referred to as thermosetting resins, in addition to the powder coating is that they are low molecular weight oligomer, construction viscosity is low, as the crosslinking density increases, the viscosity, the free volume decreases, and Tg increased, to generate continuous uniform solid coating.
Rosin resin is a kind of light color, highly polymerization (ii) polymerization of high softening point, high viscosity, and better oxidation resistance, and in the liquid state or in solution crystallization resistance completely, it's a variety of purposes including paint, desiccant, synthetic resin, auto ink, floor tile, rubber compound, flux, solder paste, as well as a variety of adhesives and protective coating.
Alkyd resin is modified polyester resin by polyol, phthalic anhydride and fatty acid or oil (triglycerides). The number and structure of double bonds in fatty acid (or oil) molecules can be classified into three categories: dry, semidry and non-dry.
Dry alkyd resin can be crosslinked in the air; Non-dry alkyd resin is mixed with amino resins, which can be crosslinked by heating. In addition, the content of the fatty acid (or oil) or phthalic anhydride, which can be divided into short, medium, long and very long four oil degrees of alkyd resin. The alkyd resin has a good quality of gloss and toughness, strong adhesion and good abrasion resistance, resistance and insulation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian