News Details
Modified water-based polyurethane coating crosslinking agent
2017-6-13 11:48:26
Modified water-based polyurethane coating crosslinking agent
As people environmental protection consciousness enhancement, the people of their own living environment more and more attention, the traditional solvent-based polyurethane adhesive is toxic, flammable, peculiar smell, easy to cause air pollution and so on shortcomings, and water-based paint has the advantages of nontoxic, nonflammable, pollution-free environment, and water-borne polyurethane resin has high hardness, good adhesion, corrosion resistance, solvent resistance, and low VOC content, it is water as dispersion medium binary colloidal system, in line with the current chemical industry environmental protection request, therefore is becoming more and more attention.
General polyurethane latex solid content is low, however, the poor water resistance, gloss film is low, the comprehensive performance of coating is poorer, the proper modified waterborne polyurethane emulsion can better improve the comprehensive performance of waterborne polyurethane coating, expand the range of application.
Among the various methods of modification, the most notable is the study of polyurethane/polyacrylate (PUA) compound emulsion. PUA resins incorporates the best performance of two materials at an organic whole, with high solid content can be prepared waterborne resin, reduce the process energy consumption, increase productivity, the film soft, wear-resistant, resistant to wet rubbing, hydrolysis resistance performance.
The methods of PUA are combined, copolymerization, nucleo-shell emulsion polymerization, and PUA network emulsion polymerization. In this case, the combination of epoxy resins e-44 and methyl methacrylate (MMA) composite modified water-based polyurethane (HEA) and MMA were associated with copolymerization.
The system is made of acrylic acid and polyurethane, and HEA is a composite type PUA compound emulsion for the bridge between the nuclear shells. This kind of composite emulsion concentration of the polyurethane low temperature resistance, good flexibility, adhesion, water resistance and weatherability of acrylate, epoxy resin of high modulus, high strength, good chemical resistance and many other advantages.
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.
Experimental results show that, with epoxy resin E - 44 and MMA content increased, gradually increase film hardness, tensile strength and water resistance, elongation at break and the stability of the emulsion glue with lower, when E - 44 epoxy content is 4%, MMA content is 20% ~ 30% comprehensive performance is better.
Next several USES modified polyurethane has outstanding comprehensive effect: waterborne polyurethane wood coatings, water-based polyurethane fabric coating, building waterproof coating, waterborne polyurethane anticorrosion coatings, automobile coatings, waterborne polyurethane functional water-based polyurethane coating.
Common preparation methods of copolymerization emulsion
(1) the combination of polyurethane emulsion and acrylate emulsion, combined with crosslinking agent, forms polyurethane and acrylate combined emulsion;
(2) the first synthesis of polyurethane polymer emulsion, as seed emulsion and acrylate emulsion polymerization, with core - shell structure of polyurethane acrylic ester compound emulsion;
(3) 2 kinds of emulsion interpenetrate with each other, and then react to form the polyurethane acrylate compound emulsion.
(4) synthesis with the C ═ amino formic acid ester C double bonds of unsaturated monomers, then the big monomer and other acrylic ester monomer emulsion copolymerization, polyurethane acrylate copolymer emulsion.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
As people environmental protection consciousness enhancement, the people of their own living environment more and more attention, the traditional solvent-based polyurethane adhesive is toxic, flammable, peculiar smell, easy to cause air pollution and so on shortcomings, and water-based paint has the advantages of nontoxic, nonflammable, pollution-free environment, and water-borne polyurethane resin has high hardness, good adhesion, corrosion resistance, solvent resistance, and low VOC content, it is water as dispersion medium binary colloidal system, in line with the current chemical industry environmental protection request, therefore is becoming more and more attention.
General polyurethane latex solid content is low, however, the poor water resistance, gloss film is low, the comprehensive performance of coating is poorer, the proper modified waterborne polyurethane emulsion can better improve the comprehensive performance of waterborne polyurethane coating, expand the range of application.
Among the various methods of modification, the most notable is the study of polyurethane/polyacrylate (PUA) compound emulsion. PUA resins incorporates the best performance of two materials at an organic whole, with high solid content can be prepared waterborne resin, reduce the process energy consumption, increase productivity, the film soft, wear-resistant, resistant to wet rubbing, hydrolysis resistance performance.
The methods of PUA are combined, copolymerization, nucleo-shell emulsion polymerization, and PUA network emulsion polymerization. In this case, the combination of epoxy resins e-44 and methyl methacrylate (MMA) composite modified water-based polyurethane (HEA) and MMA were associated with copolymerization.
The system is made of acrylic acid and polyurethane, and HEA is a composite type PUA compound emulsion for the bridge between the nuclear shells. This kind of composite emulsion concentration of the polyurethane low temperature resistance, good flexibility, adhesion, water resistance and weatherability of acrylate, epoxy resin of high modulus, high strength, good chemical resistance and many other advantages.
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.
Experimental results show that, with epoxy resin E - 44 and MMA content increased, gradually increase film hardness, tensile strength and water resistance, elongation at break and the stability of the emulsion glue with lower, when E - 44 epoxy content is 4%, MMA content is 20% ~ 30% comprehensive performance is better.
Next several USES modified polyurethane has outstanding comprehensive effect: waterborne polyurethane wood coatings, water-based polyurethane fabric coating, building waterproof coating, waterborne polyurethane anticorrosion coatings, automobile coatings, waterborne polyurethane functional water-based polyurethane coating.
Common preparation methods of copolymerization emulsion
(1) the combination of polyurethane emulsion and acrylate emulsion, combined with crosslinking agent, forms polyurethane and acrylate combined emulsion;
(2) the first synthesis of polyurethane polymer emulsion, as seed emulsion and acrylate emulsion polymerization, with core - shell structure of polyurethane acrylic ester compound emulsion;
(3) 2 kinds of emulsion interpenetrate with each other, and then react to form the polyurethane acrylate compound emulsion.
(4) synthesis with the C ═ amino formic acid ester C double bonds of unsaturated monomers, then the big monomer and other acrylic ester monomer emulsion copolymerization, polyurethane acrylate copolymer emulsion.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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