News Details
Solvent-free coatings crosslinking agent
2017-3-22 20:47:36
Solvent-free coatings crosslinking agent, solvent-free coatings is also called active solvent paint, consists of synthetic resin, crosslinking agent and coating made of solvent, with active formula system of all components in addition to the very small amounts of volatile, are involved in the reaction got behind in membrane, less pollution to the environment, solvent-free system viscosity is higher, usually require the use of special construction tools and technology, is still under development.
Without solvent volume and high solid coatings quality solid content in the solid content at 60% or more than 80% of the coating is called high solid coatings. Increased day by day along with the global environmental protection, high solid coatings become the fastest growing low pollution coatings in recent years, the most widely used breed, have now been to the solid content of 100% solvent-free coatings that promote the trend.
The advantages of using solvent-free coating is the most outstanding, can reduce the air pollution caused by organic solvent volatilization. From around the world to the current environment of the demand is higher and higher, especially in some developed countries, on the content of volatile organic compounds (VOC) in coatings are given limitations, limits on emissions of volatile organic compounds are also.
Strictly limiting the amount of VOC in coatings, down to the greatest degree of reduce the damage to the environment, to achieve zero emissions will be the direction of the future, alien solvent-free coating has reached the standards, in heavy-duty coating, coating without solvent, water will be the development direction of the future, and solvent-free epoxy coating is more practical in the current conditions.
Due to the use of solvent-free coatings is a kind of coating without solvent, no tar, paint solid content is above 95%, high viscosity, the spraying equipment raised higher requirements. Old products using the traditional air spraying technology and airless spray painting of the old pump, fundamental this paint can not be normal, so add the pressure higher than new spray pump.
But in the process of construction, because it does not contain solvents, the dry, not by evaporation of the solvent in the process of solidification, and completely dependent on its curing reaction, the reaction process is faster, and greatly influenced by temperature, therefore, after a two-component mixed with shorter lifespan. Although the coating can be adjusted by the selection of curing agent formula could, but still increased the difficulty of construction. To solve this problem, an alien coating suggest that consumers may take the following measures.
A. solvent-free coatings when the choose and buy should pay attention to when using the environment temperature, under 0 ℃, solvent-free coatings curing reaction ground to a halt, in this environment is not suitable for choosing solvent-free coating; Below 20 ℃, the proposal chooses winter type solvent-free epoxy coating; When more than 20 ℃, choose summer type with no solvent coatings.
B. coatings during the using period must be considered when making up the construction of ability, in this period of time with as much as they can finish, so as to avoid waste caused by too much too late to use gel ingredients.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
C. if use spraying way construction, appropriate chooses pressure than big airless spray pump, improve the output fluid pressure, always choose appropriate diameter of nozzle, the appropriate nozzle tube length. In addition, the winter construction due to the low temperature, the viscosity of paint, according to past experience with increase of thinner to reduce the viscosity, but when using solvent-free coating, if only rely on this method will lose the meaning of using solvent-free coatings.
So try to paint in the process of use in indoor, placed in the container in advance to keep the paint at the scene temperature, the temperature of the paint itself not less than 15 ℃, as far as possible in order to improve the temperature to reduce the viscosity of paint, to achieve the requirement of the spray can, and the appropriate improve coating of pump pressure, to shorten the length of the spray paint hose as far as possible, so that the normal spray paint can.
D. if use roller brush or construction, for the plane may be beyond design thickness, the facade to prevent sagging phenomenon, should use hard brush or short hair roller pressure, do not besmear too thick, coating film thickness control within 400 microns, to prevent sagging phenomenon.
During the construction of a solvent-free coatings, the coating higher requirements for surface treatment. It must be rushing sand to Sa2.5 level, before operation and chemical construction to remove all grease and other dirt. For oil and pollution is more sensitive to clean, and sometimes even more than the requirement for the quality of rust removal.
As found in the construction of local derusting below Sa2.5 level, as long as can achieve St3 level, still there will be no adverse reactions. If the surface treatment, improper cleaning, degreasing not clean, solvent-free coatings coating will like sexual coating can peel the whole layer, stripped down.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Without solvent volume and high solid coatings quality solid content in the solid content at 60% or more than 80% of the coating is called high solid coatings. Increased day by day along with the global environmental protection, high solid coatings become the fastest growing low pollution coatings in recent years, the most widely used breed, have now been to the solid content of 100% solvent-free coatings that promote the trend.
The advantages of using solvent-free coating is the most outstanding, can reduce the air pollution caused by organic solvent volatilization. From around the world to the current environment of the demand is higher and higher, especially in some developed countries, on the content of volatile organic compounds (VOC) in coatings are given limitations, limits on emissions of volatile organic compounds are also.
Strictly limiting the amount of VOC in coatings, down to the greatest degree of reduce the damage to the environment, to achieve zero emissions will be the direction of the future, alien solvent-free coating has reached the standards, in heavy-duty coating, coating without solvent, water will be the development direction of the future, and solvent-free epoxy coating is more practical in the current conditions.
Due to the use of solvent-free coatings is a kind of coating without solvent, no tar, paint solid content is above 95%, high viscosity, the spraying equipment raised higher requirements. Old products using the traditional air spraying technology and airless spray painting of the old pump, fundamental this paint can not be normal, so add the pressure higher than new spray pump.
But in the process of construction, because it does not contain solvents, the dry, not by evaporation of the solvent in the process of solidification, and completely dependent on its curing reaction, the reaction process is faster, and greatly influenced by temperature, therefore, after a two-component mixed with shorter lifespan. Although the coating can be adjusted by the selection of curing agent formula could, but still increased the difficulty of construction. To solve this problem, an alien coating suggest that consumers may take the following measures.
A. solvent-free coatings when the choose and buy should pay attention to when using the environment temperature, under 0 ℃, solvent-free coatings curing reaction ground to a halt, in this environment is not suitable for choosing solvent-free coating; Below 20 ℃, the proposal chooses winter type solvent-free epoxy coating; When more than 20 ℃, choose summer type with no solvent coatings.
B. coatings during the using period must be considered when making up the construction of ability, in this period of time with as much as they can finish, so as to avoid waste caused by too much too late to use gel ingredients.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
C. if use spraying way construction, appropriate chooses pressure than big airless spray pump, improve the output fluid pressure, always choose appropriate diameter of nozzle, the appropriate nozzle tube length. In addition, the winter construction due to the low temperature, the viscosity of paint, according to past experience with increase of thinner to reduce the viscosity, but when using solvent-free coating, if only rely on this method will lose the meaning of using solvent-free coatings.
So try to paint in the process of use in indoor, placed in the container in advance to keep the paint at the scene temperature, the temperature of the paint itself not less than 15 ℃, as far as possible in order to improve the temperature to reduce the viscosity of paint, to achieve the requirement of the spray can, and the appropriate improve coating of pump pressure, to shorten the length of the spray paint hose as far as possible, so that the normal spray paint can.
D. if use roller brush or construction, for the plane may be beyond design thickness, the facade to prevent sagging phenomenon, should use hard brush or short hair roller pressure, do not besmear too thick, coating film thickness control within 400 microns, to prevent sagging phenomenon.
During the construction of a solvent-free coatings, the coating higher requirements for surface treatment. It must be rushing sand to Sa2.5 level, before operation and chemical construction to remove all grease and other dirt. For oil and pollution is more sensitive to clean, and sometimes even more than the requirement for the quality of rust removal.
As found in the construction of local derusting below Sa2.5 level, as long as can achieve St3 level, still there will be no adverse reactions. If the surface treatment, improper cleaning, degreasing not clean, solvent-free coatings coating will like sexual coating can peel the whole layer, stripped down.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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