News Details
Room temperature curing two-component water-borne coatings crosslinking agent
2017-3-17 11:24:06
Room temperature curing two-component water-borne coatings crosslinking agent,Crosslinking is the basic method, significantly improve the coating performance by crosslinking can greatly improve the properties of the coating and enlarge the range of coatings. Type high temperature baking crosslinked coating have been given the application in the industry, its representative varieties are water-based amino, water-based epoxy type of paint. Room temperature crosslinking, however, is a more attractive.
Water-based paint room temperature crosslinking methods mainly include:
(1) stated method, emulsion or some synthesis to join a small amount of three faculties degrees or higher faculties compounds form slightly crosslinked, or water to evaporate after can react with active group in molecular compounds crosslinking, such as amide/hydrazide crosslinking, stated link "effect on the improvement of the performance of the coating is limited;
(2) the dry gas, waterborne alkyd or aqueous ammonia ester oil system using crosslinked oxygen in the air;
(3) the foreign method, crosslinking agent was added to constitute two-component coating. Diplomatic method can significantly improve the coating performance, many kinds of crosslinking agent, the key is to choose a kind of excellent crosslinking agent.
The mechanism of water-based coating crosslinked at room temperature. Anionic water-borne coating resin of carboxyl and hydroxyl groups, provides the possibility of further crosslinking, at room temperature can react with carboxyl and hydroxyl functionality more compounds can be used as crosslinking agent.
Isocyanate temperature can react with the hydroxyl resin, generate carbamate, this is typical of polyurethane reaction. Two-component water-borne coatings may also has the isocyanate with carboxyl reaction, generate amide and gives off carbon dioxide, so don't try to control and carboxyl reaction; Isocyanate react with water to produce the urea and gives off carbon dioxide is also the most don't want to coating of ability in the side reactions.
Kinds of crosslinking agent on the properties of coatings. On the same emulsion with different types of crosslinking agent after crosslinked coating performance will have much difference, is the issue of concern.
Chose three different types of crosslinking agent to test and compare with paint, construction and coating performance difference, sometimes with the two-component curing agent has a large number of applications such as Rhodia 2102 contrast, the difference of research performance.
Main ingredient in 1 kind of acrylic polyurethane core-shell emulsion with various additives. Curing cross-linking agent mixed with the main ingredient is easier. Is A polyfunctional isocyanate type degree of crosslinking agent, similar to Rhodia's 2102, increased after hydrophilic modification and some mixed ability, because the viscosity is small, easy blending than in 2102. B and C viscosity is small, has the certain hydrophilicity, and the main ingredient to blending.
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.
Four kinds of crosslinking agent at room temperature for the period length difference is very big, 2102 minimum, only 3 h, slightly too short; There are 7 h A, B, general construction is enough; C, the longest can amount to several days, the convenient degree equivalent to a single component coating.
Coating appearance with B and C curing performance is normal, uniform coating of transparent, and isocyanate crosslinked coating transparency is poor, blushing, dust particles are small particles, indicates that manual mixing dispersion, mixing uniformity is not enough, the isocyanate crosslinking agent with acetone diluted to join still cannot completely overcome, visible compared with other two types of crosslinking agent, isocyanate crosslinking agent relatively large hydrophobic has a significant influence on the uniformity of film forming.
Four kinds of bi-component paint table dry and action time and single-component coating has no obvious difference, the table under 25 ℃ dry in half an hour, work no more than 3 h, however, coating completely dry reached ultimate strength of the time in more than 5 d.
The dosage of crosslinking agent on the coating hardness. Crosslinking can improve the hardness of coating. Crosslinking agent in the coating hardness is maximum, when a certain amount of the crosslinking agent of reactive species and the yield of the crosslinking agent, is also related to the emulsion and the kinds of coating formula.
Crosslinking agent is overmuch, can't attend the reaction of the crosslinking agent ACTS as a plasticizer, coating hardness declines. Crosslinking agent A hydrophilic modification of chain is longer, to join the larger the amount of coating the soft. In 2102 and C curing coating hardness is relatively high.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Water-based paint room temperature crosslinking methods mainly include:
(1) stated method, emulsion or some synthesis to join a small amount of three faculties degrees or higher faculties compounds form slightly crosslinked, or water to evaporate after can react with active group in molecular compounds crosslinking, such as amide/hydrazide crosslinking, stated link "effect on the improvement of the performance of the coating is limited;
(2) the dry gas, waterborne alkyd or aqueous ammonia ester oil system using crosslinked oxygen in the air;
(3) the foreign method, crosslinking agent was added to constitute two-component coating. Diplomatic method can significantly improve the coating performance, many kinds of crosslinking agent, the key is to choose a kind of excellent crosslinking agent.
The mechanism of water-based coating crosslinked at room temperature. Anionic water-borne coating resin of carboxyl and hydroxyl groups, provides the possibility of further crosslinking, at room temperature can react with carboxyl and hydroxyl functionality more compounds can be used as crosslinking agent.
Isocyanate temperature can react with the hydroxyl resin, generate carbamate, this is typical of polyurethane reaction. Two-component water-borne coatings may also has the isocyanate with carboxyl reaction, generate amide and gives off carbon dioxide, so don't try to control and carboxyl reaction; Isocyanate react with water to produce the urea and gives off carbon dioxide is also the most don't want to coating of ability in the side reactions.
Kinds of crosslinking agent on the properties of coatings. On the same emulsion with different types of crosslinking agent after crosslinked coating performance will have much difference, is the issue of concern.
Chose three different types of crosslinking agent to test and compare with paint, construction and coating performance difference, sometimes with the two-component curing agent has a large number of applications such as Rhodia 2102 contrast, the difference of research performance.
Main ingredient in 1 kind of acrylic polyurethane core-shell emulsion with various additives. Curing cross-linking agent mixed with the main ingredient is easier. Is A polyfunctional isocyanate type degree of crosslinking agent, similar to Rhodia's 2102, increased after hydrophilic modification and some mixed ability, because the viscosity is small, easy blending than in 2102. B and C viscosity is small, has the certain hydrophilicity, and the main ingredient to blending.
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.
Four kinds of crosslinking agent at room temperature for the period length difference is very big, 2102 minimum, only 3 h, slightly too short; There are 7 h A, B, general construction is enough; C, the longest can amount to several days, the convenient degree equivalent to a single component coating.
Coating appearance with B and C curing performance is normal, uniform coating of transparent, and isocyanate crosslinked coating transparency is poor, blushing, dust particles are small particles, indicates that manual mixing dispersion, mixing uniformity is not enough, the isocyanate crosslinking agent with acetone diluted to join still cannot completely overcome, visible compared with other two types of crosslinking agent, isocyanate crosslinking agent relatively large hydrophobic has a significant influence on the uniformity of film forming.
Four kinds of bi-component paint table dry and action time and single-component coating has no obvious difference, the table under 25 ℃ dry in half an hour, work no more than 3 h, however, coating completely dry reached ultimate strength of the time in more than 5 d.
The dosage of crosslinking agent on the coating hardness. Crosslinking can improve the hardness of coating. Crosslinking agent in the coating hardness is maximum, when a certain amount of the crosslinking agent of reactive species and the yield of the crosslinking agent, is also related to the emulsion and the kinds of coating formula.
Crosslinking agent is overmuch, can't attend the reaction of the crosslinking agent ACTS as a plasticizer, coating hardness declines. Crosslinking agent A hydrophilic modification of chain is longer, to join the larger the amount of coating the soft. In 2102 and C curing coating hardness is relatively high.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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