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Water-based paint room temperature crosslinking agent
2017-5-26 18:32:51
Water-based paint room temperature crosslinking agent
In this paper, the paper introduces the technology of self-crosslinking, and describes the mechanism of crosslinking.
1 n-hydroxymethyl acrylamide and its derivatives are at room temperature. N - methylol acrylamide and its derivatives is one of the most commonly used to used for the preparation of one-component room temperature since the crosslinked coating of the functional monomer, among them, N - methylol acrylamide as prices are relatively low, most of reactants and application.
When N - hydroxy methyl acrylamide as self crosslinking functional monomer is introduced into the makings of water-based coating resin emulsion, emulsion has a self crosslinking performance, the formation of coating has higher tensile strength, toughness, wear resistance and solvent resistance. with
The derivatives of n-hydroxymethyl acrylamide, which is used in the preparation of single component room temperature self-crosslinked waterborne coatings, are mainly n-isobutyl methacrylamide. Compared to n-hydroxymethyl acrylamide, n-isobutyl methacrylamide is more soluble in oil and therefore more suitable for copolymerization with acrylic monomer. At the same time, due to its toxicity is relatively small, the film release isobutanol gas, harmless to the environment, and N - methylol acrylamide when emulsion curing film release excitant gas formaldehyde, so in recent years, N - methyl isobutyl oxygen radicals acrylamide got more widely used.
N - methylol acrylamide can separate crosslinking system, through condensation to form its own reactive cross-linking, this kind of crosslinking reaction is lively hydrogen to participate in the crosslinking reaction of amide tertiary amides.
The introduction of N - methylol acrylamide system, adding methyl acrylate and acrylic acid monomers containing carboxyl, and N - methylol acrylamide composite crosslinking system, can avoid N - methylol acrylamide homopolymerization in the water phase due to the hydrophilic too strong. This kind of composite crosslinking system is through the N - methylol acrylamide hydroxymethyl or N atoms on the active hydrogen and acrylic monomers on the carboxyl crosslinking reaction and implementation.
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.
N-hydroxymethyl acrylamide is typically introduced into the polymer chain to form self-crosslinking latex through the emulsion polymerization. Volfova using core-shell emulsion polymerization, such as preparation of N - methylol acrylamide as crosslinking monomer acrylate core-shell emulsion, and compared with N - methylol acrylamide before and after the modification of acrylate core-shell emulsion coating performance, the research results show that due to the presence of N - hydroxy methyl acryloyl, part of the crosslinking reaction has occurred in the process of polymerization and modification of emulsion with self crosslinking performance, coating has higher mechanical properties and solvent resistance.
Krishnan also USES such as core-shell emulsion polymerization with different content of carbon four bromide was synthesized as chain transfer agent of N - hydroxy methyl acryloyl and n-butyl methacrylate since the crosslinking copolymerization emulsion, the emulsion coating before solidification has lower degree of crosslinking, after curing high crosslinking degree.
Aguilar etc. On this basis, the core-shell emulsion polymerization and microemulsion polymerization are compared the two kinds of polymerization methods of N - hydroxy methyl acryloyl and n-butyl methacrylate since the crosslinking on the mechanical properties of the copolymer emulsion, gel content and influences the performance of different index of the solute.
Results show that by microemulsion polymerization of self crosslinking emulsion polymerization degree after curing, and core-shell emulsion polymerization method, self crosslinking emulsion polymerization degree in emulsion does not increase after curing, microemulsion polymerization method, also on the mechanical properties of the emulsion of the coating is better than a two-step emulsion polymerization. The degree of self-crosslinking of n-hydroxymethyl acrylamide is influenced by the crosslinked temperature, and the higher the crosslinking temperature, the faster the crosslinking response rate.
Containing N - methylol acrylamide acrylate copolymer emulsion crosslinking reaction is about to begin at about 60 ℃, the system of crosslinking density with the increase of crosslinking temperature of the system and increase slowly, but after crosslinking temperature to 180 ℃, the system of the crosslinking density of no longer increases. At room temperature, the copolymer emulsion containing n-hydroxymethylacrylamide requires at least 7 d to form the densification of the compact crosslinking.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
In this paper, the paper introduces the technology of self-crosslinking, and describes the mechanism of crosslinking.
1 n-hydroxymethyl acrylamide and its derivatives are at room temperature. N - methylol acrylamide and its derivatives is one of the most commonly used to used for the preparation of one-component room temperature since the crosslinked coating of the functional monomer, among them, N - methylol acrylamide as prices are relatively low, most of reactants and application.
When N - hydroxy methyl acrylamide as self crosslinking functional monomer is introduced into the makings of water-based coating resin emulsion, emulsion has a self crosslinking performance, the formation of coating has higher tensile strength, toughness, wear resistance and solvent resistance. with
The derivatives of n-hydroxymethyl acrylamide, which is used in the preparation of single component room temperature self-crosslinked waterborne coatings, are mainly n-isobutyl methacrylamide. Compared to n-hydroxymethyl acrylamide, n-isobutyl methacrylamide is more soluble in oil and therefore more suitable for copolymerization with acrylic monomer. At the same time, due to its toxicity is relatively small, the film release isobutanol gas, harmless to the environment, and N - methylol acrylamide when emulsion curing film release excitant gas formaldehyde, so in recent years, N - methyl isobutyl oxygen radicals acrylamide got more widely used.
N - methylol acrylamide can separate crosslinking system, through condensation to form its own reactive cross-linking, this kind of crosslinking reaction is lively hydrogen to participate in the crosslinking reaction of amide tertiary amides.
The introduction of N - methylol acrylamide system, adding methyl acrylate and acrylic acid monomers containing carboxyl, and N - methylol acrylamide composite crosslinking system, can avoid N - methylol acrylamide homopolymerization in the water phase due to the hydrophilic too strong. This kind of composite crosslinking system is through the N - methylol acrylamide hydroxymethyl or N atoms on the active hydrogen and acrylic monomers on the carboxyl crosslinking reaction and implementation.
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.
N-hydroxymethyl acrylamide is typically introduced into the polymer chain to form self-crosslinking latex through the emulsion polymerization. Volfova using core-shell emulsion polymerization, such as preparation of N - methylol acrylamide as crosslinking monomer acrylate core-shell emulsion, and compared with N - methylol acrylamide before and after the modification of acrylate core-shell emulsion coating performance, the research results show that due to the presence of N - hydroxy methyl acryloyl, part of the crosslinking reaction has occurred in the process of polymerization and modification of emulsion with self crosslinking performance, coating has higher mechanical properties and solvent resistance.
Krishnan also USES such as core-shell emulsion polymerization with different content of carbon four bromide was synthesized as chain transfer agent of N - hydroxy methyl acryloyl and n-butyl methacrylate since the crosslinking copolymerization emulsion, the emulsion coating before solidification has lower degree of crosslinking, after curing high crosslinking degree.
Aguilar etc. On this basis, the core-shell emulsion polymerization and microemulsion polymerization are compared the two kinds of polymerization methods of N - hydroxy methyl acryloyl and n-butyl methacrylate since the crosslinking on the mechanical properties of the copolymer emulsion, gel content and influences the performance of different index of the solute.
Results show that by microemulsion polymerization of self crosslinking emulsion polymerization degree after curing, and core-shell emulsion polymerization method, self crosslinking emulsion polymerization degree in emulsion does not increase after curing, microemulsion polymerization method, also on the mechanical properties of the emulsion of the coating is better than a two-step emulsion polymerization. The degree of self-crosslinking of n-hydroxymethyl acrylamide is influenced by the crosslinked temperature, and the higher the crosslinking temperature, the faster the crosslinking response rate.
Containing N - methylol acrylamide acrylate copolymer emulsion crosslinking reaction is about to begin at about 60 ℃, the system of crosslinking density with the increase of crosslinking temperature of the system and increase slowly, but after crosslinking temperature to 180 ℃, the system of the crosslinking density of no longer increases. At room temperature, the copolymer emulsion containing n-hydroxymethylacrylamide requires at least 7 d to form the densification of the compact crosslinking.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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