News Details
Low surface treatment paint crosslinking agent
2017-6-21 23:48:55
Low surface treatment paint crosslinking agent
Due to low relative molecular quality resin in the coating, the surface has good permeability to the residual rust and the old coating with micropores and capillaries. In order to ensure the penetration time, besides the resin, you must also control the variety and the amount of anti-rust pigment in the coating to ensure that the coating has certain drying time.
Penetration is strong, the adhesion of coating is excellent. Euronany ES 301 epoxy low-surface coating and steel surface adhesion can reach 24.0 MPa; The 9100 epoxy low surface treatment coating was applied in the early test of the yangpu bridge maintenance project in Shanghai, and was applied to the surface of the anchor steel surface of the anchor block with rust spot on the wet, and the adhesion of the method was 18.0 MPa.
In low surface treatment coating, choose suitable resin and crosslinking agent, using leaf pigment etc, make the film get effective flexibility, tolerance of different expansion coefficient and increase the resistance of the coating the old coating cracking ability. The flexibility of the coating also makes low surface treatment coating with low temperature construction performance, and can be carried out in the case of high relative humidity or substrate.
The corrosion resistance of low-surface treatment coatings is mainly derived from the pigments such as zinc phosphate, zinc oxide and chromate, etc.
Low surface treatment coating formula of neutral solvent used, high solid content, or is a solvent-free coatings, to effectively reduce the adverse impact of the new coating for old coating (such as biting, wrinkling, etc.), thus increasing the compatibility of the old and new coating. If the coating is primer with epoxy low surface coating, it has better supporting performance with acrylic polyurethane, acrylic and ethylene. For indoor steel structure, immersed steel structure, etc., the coating has the effect of bottom and surface.
Most of the low-surface treatment coatings are thick film heavy coatings with high solid content, solid content is more than 82%, and VOC is less than 200g/L. Under the condition of high-pressure airless spraying, a spray can be used for 125-400umdft, which can reduce the cost of coating and environmental protection.
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.
Tg for more than 35 ℃ of polymer emulsion is likely to increase the amount of film forming additives to guarantee the reliability of the cryogenic film-forming, then should gradually improve the film forming additive dosage, until the low temperature (10 ℃ or lower) coating can form no crack, no pulverization of uniform paint film, find out the minimum dosage of film-forming additives.
It is not advisable to use the dosage of the emulsion or the dispersants in the amount of the emulsion, and should consider the replacement of other membrane auxiliaries. In addition to lower the minimum film-forming temperature and improve film density, film forming agent can also improve the work performance, increase the flow flat paint, extend the opening time, improve the storage stability of the paint, especially low temperature freeze protection.
Water-based paint film forming additives for alcohol ether type of solvent, commonly is the most commonly used in the diethyl ether, propylene alcohol ether and N - methyl pyrrolidone film-forming additives, such as with high and low boiling point. In construction of waterborne coatings in the summer, moisture volatilizes quickly, namely table relatively dry too fast, some water may be closed before was not dry inside coating, lead to coating white or flow leveling is bad. Therefore, the drying rate of the film can be delayed by adding a small amount of suitable and suitable high boiling solvents, and the opening time of the coating is extended to improve the construction performance and the appearance of the coating.
In winter, due to the low temperature, water paint drying speed slower, namely the volatilization of water slowly, but relatively volatile faster than water film-forming agent, perhaps part of the water evaporation together, not make coating can't form a dense coating, water-based paint coating is white and cracking phenomenon.
So add the film-forming agent, must consider to overcome the construction of waterborne coatings in different seasons, should also consider the drying speed is fast as possible, this also is the main technical points of the coating of ability in the most difficult, especially high Tg acrylic dispersions is more difficult to solve the problem. Therefore, it is the best choice to combine multiple film additives.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Due to low relative molecular quality resin in the coating, the surface has good permeability to the residual rust and the old coating with micropores and capillaries. In order to ensure the penetration time, besides the resin, you must also control the variety and the amount of anti-rust pigment in the coating to ensure that the coating has certain drying time.
Penetration is strong, the adhesion of coating is excellent. Euronany ES 301 epoxy low-surface coating and steel surface adhesion can reach 24.0 MPa; The 9100 epoxy low surface treatment coating was applied in the early test of the yangpu bridge maintenance project in Shanghai, and was applied to the surface of the anchor steel surface of the anchor block with rust spot on the wet, and the adhesion of the method was 18.0 MPa.
In low surface treatment coating, choose suitable resin and crosslinking agent, using leaf pigment etc, make the film get effective flexibility, tolerance of different expansion coefficient and increase the resistance of the coating the old coating cracking ability. The flexibility of the coating also makes low surface treatment coating with low temperature construction performance, and can be carried out in the case of high relative humidity or substrate.
The corrosion resistance of low-surface treatment coatings is mainly derived from the pigments such as zinc phosphate, zinc oxide and chromate, etc.
Low surface treatment coating formula of neutral solvent used, high solid content, or is a solvent-free coatings, to effectively reduce the adverse impact of the new coating for old coating (such as biting, wrinkling, etc.), thus increasing the compatibility of the old and new coating. If the coating is primer with epoxy low surface coating, it has better supporting performance with acrylic polyurethane, acrylic and ethylene. For indoor steel structure, immersed steel structure, etc., the coating has the effect of bottom and surface.
Most of the low-surface treatment coatings are thick film heavy coatings with high solid content, solid content is more than 82%, and VOC is less than 200g/L. Under the condition of high-pressure airless spraying, a spray can be used for 125-400umdft, which can reduce the cost of coating and environmental protection.
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.
Tg for more than 35 ℃ of polymer emulsion is likely to increase the amount of film forming additives to guarantee the reliability of the cryogenic film-forming, then should gradually improve the film forming additive dosage, until the low temperature (10 ℃ or lower) coating can form no crack, no pulverization of uniform paint film, find out the minimum dosage of film-forming additives.
It is not advisable to use the dosage of the emulsion or the dispersants in the amount of the emulsion, and should consider the replacement of other membrane auxiliaries. In addition to lower the minimum film-forming temperature and improve film density, film forming agent can also improve the work performance, increase the flow flat paint, extend the opening time, improve the storage stability of the paint, especially low temperature freeze protection.
Water-based paint film forming additives for alcohol ether type of solvent, commonly is the most commonly used in the diethyl ether, propylene alcohol ether and N - methyl pyrrolidone film-forming additives, such as with high and low boiling point. In construction of waterborne coatings in the summer, moisture volatilizes quickly, namely table relatively dry too fast, some water may be closed before was not dry inside coating, lead to coating white or flow leveling is bad. Therefore, the drying rate of the film can be delayed by adding a small amount of suitable and suitable high boiling solvents, and the opening time of the coating is extended to improve the construction performance and the appearance of the coating.
In winter, due to the low temperature, water paint drying speed slower, namely the volatilization of water slowly, but relatively volatile faster than water film-forming agent, perhaps part of the water evaporation together, not make coating can't form a dense coating, water-based paint coating is white and cracking phenomenon.
So add the film-forming agent, must consider to overcome the construction of waterborne coatings in different seasons, should also consider the drying speed is fast as possible, this also is the main technical points of the coating of ability in the most difficult, especially high Tg acrylic dispersions is more difficult to solve the problem. Therefore, it is the best choice to combine multiple film additives.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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