News Details
Low molecular polyamide coatings crosslinking agent
2017-8-5 16:02:23
Low molecular polyamide coatings crosslinking agent
The low-molecular-polyamide coating crosslinking agent is a light yellow or brownish yellow viscose liquid with a light yellow or brownish color, which is made from the reaction of vegetable oil dimer fatty acid and fatty polyamine, and the relative molecular weight is 500 ~ 9 000. Its composition is complex, contain the amine, the amine and amide base, can crosslinked epoxy resin at room temperature, have good adhesion to metal, glass, ceramic, wood and so on.
The characteristics of low molecular polyamide crosslinking agent system. This system is characterized by small shrinkage and good size stability of crosslinking. Excellent tensile, bending and compression strength; Excellent mechanical strength, thermal shock strength and excellent electrical performance; Good adhesion; Good water resistance and good drug resistance.
In addition, the low molecular polyamide crosslinking agent is almost nonvolatile, with very low toxicity and does not stimulate the skin and mucosa. Although can be cross-linked epoxy resin at room temperature, but it takes a long time, and the reaction is not completely, so in order to accelerate the normal temperature crosslinking reaction, can add some promoter, such as DMP - 30, dmae, etc.
Research progress of low molecular polyamide modification. Low molecular polyamides are currently found to be synthesized from the dimer of linoleic acid and the fatty amine. For example, 650 low molecular polyamide, also known as h-4 epoxy crosslinking agent, is a brown-red viscous liquid that is produced by the reaction of the dimer and diethylenediamine of tongoleic acid. The molecular weight is 600 ~ 1 100. Crosslinking conditions 1 ~ 5 d or 60 ℃ at room temperature for 3 h.
Cattle GuDan etc with refined and crude tall oil respectively synthesized tall oil, linoleic acid dimers and triethylene tetramine polycondensate - low molecular polyamide, obtained the best synthesis reaction conditions: acid is amine = 3:1, refined tall oil content is 20%, reaction temperature 180 ~ 265 ℃, reaction time of 5 h, and the crosslinking of epoxy resin after impact strength and tensile strength measurement, this method in the synthesis of low molecular polyamide crosslinking agent is better than crosslinking agent 651 and do not add tall oil of low molecular polyamide.
Xu ren letter USES thiourea and polyamide 650 condensation in the synthesis of epoxy resin fast crosslinking agent, a series of studies and the crosslinking agent, the results show that the crosslinking agent are fast crosslinked, crosslinking with high intensity, tenacity, matching is not strict, etc. Epoxy resin: thiourea modified polyamide (PHR) = 1:1, the gel time of 25 min, under 25 ℃ for 24 h can be completely crosslinking, fracture toughness KIC value = 1.27 MN/m3/2, on the shear strength of steel/steel is 12.5 MPa.
Setsuo Sato et al. has developed a new type of epoxy resin crosslinking agent, which is made by the reaction of polyamide through the dimer of fatty acid. The crosslinking agent can be crosslinked quickly at room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The low-molecular-polyamide coating crosslinking agent is a light yellow or brownish yellow viscose liquid with a light yellow or brownish color, which is made from the reaction of vegetable oil dimer fatty acid and fatty polyamine, and the relative molecular weight is 500 ~ 9 000. Its composition is complex, contain the amine, the amine and amide base, can crosslinked epoxy resin at room temperature, have good adhesion to metal, glass, ceramic, wood and so on.
The characteristics of low molecular polyamide crosslinking agent system. This system is characterized by small shrinkage and good size stability of crosslinking. Excellent tensile, bending and compression strength; Excellent mechanical strength, thermal shock strength and excellent electrical performance; Good adhesion; Good water resistance and good drug resistance.
In addition, the low molecular polyamide crosslinking agent is almost nonvolatile, with very low toxicity and does not stimulate the skin and mucosa. Although can be cross-linked epoxy resin at room temperature, but it takes a long time, and the reaction is not completely, so in order to accelerate the normal temperature crosslinking reaction, can add some promoter, such as DMP - 30, dmae, etc.
Research progress of low molecular polyamide modification. Low molecular polyamides are currently found to be synthesized from the dimer of linoleic acid and the fatty amine. For example, 650 low molecular polyamide, also known as h-4 epoxy crosslinking agent, is a brown-red viscous liquid that is produced by the reaction of the dimer and diethylenediamine of tongoleic acid. The molecular weight is 600 ~ 1 100. Crosslinking conditions 1 ~ 5 d or 60 ℃ at room temperature for 3 h.
Cattle GuDan etc with refined and crude tall oil respectively synthesized tall oil, linoleic acid dimers and triethylene tetramine polycondensate - low molecular polyamide, obtained the best synthesis reaction conditions: acid is amine = 3:1, refined tall oil content is 20%, reaction temperature 180 ~ 265 ℃, reaction time of 5 h, and the crosslinking of epoxy resin after impact strength and tensile strength measurement, this method in the synthesis of low molecular polyamide crosslinking agent is better than crosslinking agent 651 and do not add tall oil of low molecular polyamide.
Xu ren letter USES thiourea and polyamide 650 condensation in the synthesis of epoxy resin fast crosslinking agent, a series of studies and the crosslinking agent, the results show that the crosslinking agent are fast crosslinked, crosslinking with high intensity, tenacity, matching is not strict, etc. Epoxy resin: thiourea modified polyamide (PHR) = 1:1, the gel time of 25 min, under 25 ℃ for 24 h can be completely crosslinking, fracture toughness KIC value = 1.27 MN/m3/2, on the shear strength of steel/steel is 12.5 MPa.
Setsuo Sato et al. has developed a new type of epoxy resin crosslinking agent, which is made by the reaction of polyamide through the dimer of fatty acid. The crosslinking agent can be crosslinked quickly at room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Low molecular polyamide
The low molecular polyamide is an amber viscous resin produced by the reaction of the dimer of linoleic acid dimer or tongoleic acid dimer and adipocyte, such as ethylenediamine and diethylene triamine.
Low molecular polyamides have low volatility and low toxicity. Its molecules contain various polar groups such as primary amine, secondary amine and amide group. There is a long fat carbon chain that can play a certain role in toughening, so as a room temperature crosslinking agent, it has a certain toughness.
At room temperature, low molecular polyamide on the primary and secondary amine epoxy groups and lively H addition, crosslinking reaction is incomplete, increase the crosslinking temperature can make epoxy cross-linking is completely, to shorten the crosslinking time, add the appropriate promoter 1-3% of 2 minus 2 - (N, N two methyl ammonium methyl) phenol is K - 54 (DMP# - 30)
At 24 ℃ when epoxy resin, polyamide the residues of epoxy group in the system
Reaction time (H) 0, 2, 27, 31, 95, 124, 125
The amount of epoxy residue was % 100 92.5 46 44 42 41.2 41
Crosslinking conditions on the adhesive strength of the influence of crosslinking temperature 20 ℃, 25, 95, 145
Delivery time 2.5 days 15 days 30 minutes 30 minutes
Shear strength kg/cm2 123 200 400 420
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Low molecular polyamide
The low molecular polyamide is an amber viscous resin produced by the reaction of the dimer of linoleic acid dimer or tongoleic acid dimer and adipocyte, such as ethylenediamine and diethylene triamine.
Low molecular polyamides have low volatility and low toxicity. Its molecules contain various polar groups such as primary amine, secondary amine and amide group. There is a long fat carbon chain that can play a certain role in toughening, so as a room temperature crosslinking agent, it has a certain toughness.
At room temperature, low molecular polyamide on the primary and secondary amine epoxy groups and lively H addition, crosslinking reaction is incomplete, increase the crosslinking temperature can make epoxy cross-linking is completely, to shorten the crosslinking time, add the appropriate promoter 1-3% of 2 minus 2 - (N, N two methyl ammonium methyl) phenol is K - 54 (DMP# - 30)
At 24 ℃ when epoxy resin, polyamide the residues of epoxy group in the system
Reaction time (H) 0, 2, 27, 31, 95, 124, 125
The amount of epoxy residue was % 100 92.5 46 44 42 41.2 41
Crosslinking conditions on the adhesive strength of the influence of crosslinking temperature 20 ℃, 25, 95, 145
Delivery time 2.5 days 15 days 30 minutes 30 minutes
Shear strength kg/cm2 123 200 400 420
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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