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The coating is polyisocyanate crosslinking agent
2017-5-19 15:44:04
The coating is polyisocyanate crosslinking agent
Enclosed isocyanate's advantage is more easy to operate, and is not sensitive to air humidity, can make have enough storage stability of one-component polyurethane coating.
However, the advantages of easy operation also have the limitation that the enclosed polyisocyanate is used only for high temperature baking systems. Industrial products mainly include: butyl ketone oxime, dimethyl pyrazole (DMP), malonic ester and diisopropylamine, diisopropylamine/malonic ester, diisopropylamine/triazole, epsilon - caprolactam, cyclopentanone - 2 - carboxyl methyl ester (CPME), nonylphenol and so on.
Enclosed isocyanate is essentially a relatively more thermal stable compounds, only in the presence of a total of reactants, to achieve a feasible crosslinking temperature, can be further reduced by adding catalyst cross-linking temperature.
The temperature of the solution of single component polyurethane coating depends on the type of sealant and polyisocyanate. Table 1 lists the unsealed temperature of the main sealing agent.
In the process of baking, sealants dissociation, and entered into the atmosphere, should be dealt with in accordance with the volatile organic compounds (VOC) steam treated the same way, make it harmless, such as the burning method.
Hydrophilic modified polyisocyanates
Water-based bi-component polyurethane system is a type of low-voc product, which can be used in many applications. In these two phase systems, the use of suitable water polyol dispersion, especially the appropriate polycyanate ester, is extremely important to the quality of the coating.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Basically, there are two types of crosslinking of a water-based polymer dispersion: 1, hydrophobic, low-viscosity polyisocyanates. A self-emulsifying polyisocyanate with hydrophilic modification.
Low viscosity more hydrophobic isocyanate, however, must be accompanied by appropriate use of organic solvents, and in high shear force (such as using the mixing or dispersing equipment), to disperse in water medium. In this case, the homogeneous mixture of the substrate and crosslinking agent without the co-solvent is obtained by simple hand stirring.
Aliphatic isocyanate as HDI or IPDI trimer, with polyether glycol, simple reaction generated containing polyether urethane type nonionic emulsifier mixture of isocyanate. In this way, hydrophilic polyisocyanates are easier to emulsify in water than to apply high shear forces. This type of water-emulsified polyisocyanate is now identified as standard crosslinking agent in most water-based coatings applications.
However, by using polyether glycol carbamic acid esterification, for many chemical hydrophilic modification of isocyanates, often results in the decrease of isocyanate average functionality, thus get paint film has low crosslinking density, make its have low resistance to chemical character.
An improved method is that each pro-water polyether alcohol reacts with two polyisocyanate molecules to increase the concentration of polyisocyanate. And a small amount of polyether glycol is enough to make the products meet the dispersion, containing polyether hydrophilic modification of urea based formic acid ester emulsifier isocyanate generates a paint film, and compared the film which are obtained by standard crosslinking agent, has better water resistance and chemical resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Enclosed isocyanate's advantage is more easy to operate, and is not sensitive to air humidity, can make have enough storage stability of one-component polyurethane coating.
However, the advantages of easy operation also have the limitation that the enclosed polyisocyanate is used only for high temperature baking systems. Industrial products mainly include: butyl ketone oxime, dimethyl pyrazole (DMP), malonic ester and diisopropylamine, diisopropylamine/malonic ester, diisopropylamine/triazole, epsilon - caprolactam, cyclopentanone - 2 - carboxyl methyl ester (CPME), nonylphenol and so on.
Enclosed isocyanate is essentially a relatively more thermal stable compounds, only in the presence of a total of reactants, to achieve a feasible crosslinking temperature, can be further reduced by adding catalyst cross-linking temperature.
The temperature of the solution of single component polyurethane coating depends on the type of sealant and polyisocyanate. Table 1 lists the unsealed temperature of the main sealing agent.
In the process of baking, sealants dissociation, and entered into the atmosphere, should be dealt with in accordance with the volatile organic compounds (VOC) steam treated the same way, make it harmless, such as the burning method.
Hydrophilic modified polyisocyanates
Water-based bi-component polyurethane system is a type of low-voc product, which can be used in many applications. In these two phase systems, the use of suitable water polyol dispersion, especially the appropriate polycyanate ester, is extremely important to the quality of the coating.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Basically, there are two types of crosslinking of a water-based polymer dispersion: 1, hydrophobic, low-viscosity polyisocyanates. A self-emulsifying polyisocyanate with hydrophilic modification.
Low viscosity more hydrophobic isocyanate, however, must be accompanied by appropriate use of organic solvents, and in high shear force (such as using the mixing or dispersing equipment), to disperse in water medium. In this case, the homogeneous mixture of the substrate and crosslinking agent without the co-solvent is obtained by simple hand stirring.
Aliphatic isocyanate as HDI or IPDI trimer, with polyether glycol, simple reaction generated containing polyether urethane type nonionic emulsifier mixture of isocyanate. In this way, hydrophilic polyisocyanates are easier to emulsify in water than to apply high shear forces. This type of water-emulsified polyisocyanate is now identified as standard crosslinking agent in most water-based coatings applications.
However, by using polyether glycol carbamic acid esterification, for many chemical hydrophilic modification of isocyanates, often results in the decrease of isocyanate average functionality, thus get paint film has low crosslinking density, make its have low resistance to chemical character.
An improved method is that each pro-water polyether alcohol reacts with two polyisocyanate molecules to increase the concentration of polyisocyanate. And a small amount of polyether glycol is enough to make the products meet the dispersion, containing polyether hydrophilic modification of urea based formic acid ester emulsifier isocyanate generates a paint film, and compared the film which are obtained by standard crosslinking agent, has better water resistance and chemical resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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