News Details
Crosslinking agent for allyl ester coatings
2017-8-16 11:42:17
Crosslinking agent for allyl ester coatings, is a new crosslinking agent proposed in 1995.
The crosslinking agent of isopropyl ester can quickly react with hydroxyhydroxy hydroxy polymers in acidic conditions.
Different acrylic ester crosslinking agent in more than 100 ℃ crosslinking, good solvent resistance can be obtained of the paint film.
Varieties of crosslinking agent on the crosslinking content on the mechanical properties, heat resistance, water resistance, corrosion resistance and so on have very big effect, such as the heavy aromatic amine, imidazole, acid anhydride and crosslinker crosslinked heat resistance of the epoxy resin is higher than aliphatic amine, low molecular polyamide crosslinking agent; The water resistance of aromatic acid anhydride with epoxy resin is better than that of aromatic diamine and fatty polyamide crosslinking agent. The triethylamine cross-linking agent of sanya is good for alkali resistance, but it has poor acidity and formaldehyde solution.
The drug resistance of polyamine (e.g., isovolidone diamide) is excellent. Acid anhydride crosslinking agent crosslinked epoxy resin is better than acid resistance. Appropriate crosslinking agents should be selected according to different USES and performance requirements.
Compound use several kinds of crosslinking agent, can get the result of bring out the best in each other, such as low molecular polyamide crosslinking agent with a small amount of m-phenylene diamine crosslinking agent, as well as room temperature crosslinking, and can make the crosslinking material toughness increase appropriately increase the heat resistance at the same time. Trimellitic anhydride (TMA) and methyl benzene anhydride compound using four hydrogen, eutectic mixture low viscosity (25 ℃ and 200 ~ 250 mpa, s), mixed with epoxy resin, improve the manufacturability.
Crosslinking agent can be divided into normal temperature crosslinking agent and heating crosslinking agent. The high temperature crosslinking of epoxy resin is generally good, but the coatings and adhesives used in civil buildings need to be cross-linked with normal temperature due to heating difficulties. So mostly use fatty amine, alicyclic reflected and polyamide, etc., especially in winter using coating and adhesive had with isocyanate with more, or use a foul odour of ryukyu and alcohols.
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 crosslinking agent of isopropyl ester can quickly react with hydroxyhydroxy hydroxy polymers in acidic conditions.
Different acrylic ester crosslinking agent in more than 100 ℃ crosslinking, good solvent resistance can be obtained of the paint film.
Varieties of crosslinking agent on the crosslinking content on the mechanical properties, heat resistance, water resistance, corrosion resistance and so on have very big effect, such as the heavy aromatic amine, imidazole, acid anhydride and crosslinker crosslinked heat resistance of the epoxy resin is higher than aliphatic amine, low molecular polyamide crosslinking agent; The water resistance of aromatic acid anhydride with epoxy resin is better than that of aromatic diamine and fatty polyamide crosslinking agent. The triethylamine cross-linking agent of sanya is good for alkali resistance, but it has poor acidity and formaldehyde solution.
The drug resistance of polyamine (e.g., isovolidone diamide) is excellent. Acid anhydride crosslinking agent crosslinked epoxy resin is better than acid resistance. Appropriate crosslinking agents should be selected according to different USES and performance requirements.
Compound use several kinds of crosslinking agent, can get the result of bring out the best in each other, such as low molecular polyamide crosslinking agent with a small amount of m-phenylene diamine crosslinking agent, as well as room temperature crosslinking, and can make the crosslinking material toughness increase appropriately increase the heat resistance at the same time. Trimellitic anhydride (TMA) and methyl benzene anhydride compound using four hydrogen, eutectic mixture low viscosity (25 ℃ and 200 ~ 250 mpa, s), mixed with epoxy resin, improve the manufacturability.
Crosslinking agent can be divided into normal temperature crosslinking agent and heating crosslinking agent. The high temperature crosslinking of epoxy resin is generally good, but the coatings and adhesives used in civil buildings need to be cross-linked with normal temperature due to heating difficulties. So mostly use fatty amine, alicyclic reflected and polyamide, etc., especially in winter using coating and adhesive had with isocyanate with more, or use a foul odour of ryukyu and alcohols.
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
As for the medium temperature crosslinking agent and high temperature crosslinking agent, the heat resistance of the body and the heat resistance, adhesiveness and drug resistance of the crosslinking materials are selected. Choose focus for polyamine and anhydride. It is widely used in electronics and electronics because of its excellent electrical properties.
The polyamine crosslinking of aliphatic polyamine is good for alkali resistance and water resistance. Aromatic polyamines are also excellent in drug resistance. Because of the amino nitrogen element and metal forming hydrogen bond, it has excellent anti-rust effect. The higher the concentration of amine, the better the anti-rust effect. Acid anhydride crosslinking agent and epoxy resin formed ester bonds, which showed high resistance to organic acids and inorganic acids, and the electrical properties generally exceeded polyamine.
Coating appear orange peel the causes of this phenomenon is more, the cause of disease is caused by the surface tension changes film, one of the causes is: when coating is dry, with the evaporation of the solvent, wet coating surface concentration (solid), temperature drop, the higher surface tension. The wet coating surface and bottom surface tension is different, so produce a great impetus, make the paint from the bottom upward movement, the movement causes local vortex, forming boehner, vortex flow origin as the volcano eruption outward from the lower coating, the low surface tension coating into the surrounding surface tension is high, so forming uplift area. And the hexagonal shape of the wet film forming rule is different from the concentration of the edge pigment. Poor level of flow, the paint film will leave a bumpy orange peel after drying.
In addition to the surface tension factors, such as the distance of the spray gun, the improper mixing of the solvent and the paint, and the improper paint spray can cause the production of the orange peel defect. This is due to the atomized droplets undergo a longer distance, has been volatile solvent after more to get to the coated surface, then the droplet solidification degree is high, the surface tension also becomes larger, down to the wet coating can spread out, and wet coating coating can automatically to the small droplet spreading around, then these small droplets becomes the high slope and formed dry film orange peel.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
As for the medium temperature crosslinking agent and high temperature crosslinking agent, the heat resistance of the body and the heat resistance, adhesiveness and drug resistance of the crosslinking materials are selected. Choose focus for polyamine and anhydride. It is widely used in electronics and electronics because of its excellent electrical properties.
The polyamine crosslinking of aliphatic polyamine is good for alkali resistance and water resistance. Aromatic polyamines are also excellent in drug resistance. Because of the amino nitrogen element and metal forming hydrogen bond, it has excellent anti-rust effect. The higher the concentration of amine, the better the anti-rust effect. Acid anhydride crosslinking agent and epoxy resin formed ester bonds, which showed high resistance to organic acids and inorganic acids, and the electrical properties generally exceeded polyamine.
Coating appear orange peel the causes of this phenomenon is more, the cause of disease is caused by the surface tension changes film, one of the causes is: when coating is dry, with the evaporation of the solvent, wet coating surface concentration (solid), temperature drop, the higher surface tension. The wet coating surface and bottom surface tension is different, so produce a great impetus, make the paint from the bottom upward movement, the movement causes local vortex, forming boehner, vortex flow origin as the volcano eruption outward from the lower coating, the low surface tension coating into the surrounding surface tension is high, so forming uplift area. And the hexagonal shape of the wet film forming rule is different from the concentration of the edge pigment. Poor level of flow, the paint film will leave a bumpy orange peel after drying.
In addition to the surface tension factors, such as the distance of the spray gun, the improper mixing of the solvent and the paint, and the improper paint spray can cause the production of the orange peel defect. This is due to the atomized droplets undergo a longer distance, has been volatile solvent after more to get to the coated surface, then the droplet solidification degree is high, the surface tension also becomes larger, down to the wet coating can spread out, and wet coating coating can automatically to the small droplet spreading around, then these small droplets becomes the high slope and formed dry film orange peel.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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