News Details
Thermosetting paint crosslinking agent
2017-6-1 11:04:02
Thermosetting paint crosslinking agent
As thermosetting coating, the crosslinking agent used in the direct influence on the performance of the electrodeposition bath and coating various. Now commonly used technology is enclosed in the cationic acrylic resin isocyanate crosslinking agent, but a process complicated and difficult to control product quality, the emulsion particle size is big, poor stability of bath. Organic siloxane with low glass transition temperature and low surface tension and other excellent properties. The organic siloxane modified acrylic resin, may obtain takes both excellent properties of the resin, and can realize one-component self crosslinking, thus overcome the crosslinking agent and resin reaction or blending.
The effect of the polymerization temperature on the dispersed liquid particle size and its distribution. Dispersion particle size of dispersion viscosity, film forming conditions and coating properties have great influence, with the increase of particle size, the viscosity of the dispersion and stability were lower [9]; The luster of the coating, water resistance, hardness, dispersion, and the adhesion strength of the pigment is reduced, and the coating drying time, gas permeability is extended or increase with the increase of particle size.
Experiment found that the polymerization temperature is the biggest factor that influence the dispersion particle size and its distribution. Figure 1 as the other conditions at the same time, different temperature dispersion preparation by the particle size and its distribution.
75 ℃ by dispersion of the preparation of colloidal particle size distribution in 172 ~ 176 nm range, the average particle size was 174.3 nm (light scattering instrument automatic display data), 85 ℃ when the preparation of the dispersion of colloidal particle size distribution in 20 ~ 25 nm range, the average particle size was 23.2 nm, 95 ℃ by dispersion of the preparation of colloidal particle size distribution is wide, mostly in 80 ~ 150 nm range, the average particle size of 105.4 nm. So the best polymerization temperature is 85 ℃ in the system.
The reason is that there are more of them in the lower temperature; High temperature increase trend of siloxane hydrolysis, system has a greater difference between two kinds of structure and polarity particles, leads to wider particle size distribution. Combined with figure 2 actual electron micrograph of a dispersion particles can be seen that the preparation of the particles at three temperatures are irregular shape, particle size consistent with the results of the laser scattering instrument to measure.
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
The characteristics of organosiloxane are strongly absorbed in between 1100 and 1000cm - 1, and in 1000 ~ 667, 1650 ~ 1580, 3100 ~ 3000cm - 1 produces the C = C key feature absorption band (figure 4).
At 1734 cm - 1 acrylate is a class C = O stretching vibration peak, 1170 cm - 1 appear acrylate is a class C, O, C stretching vibration peak, 2960, 2876 cm - 1 methyl, methylene characteristic absorption peak, respectively shows that participate in the polymerization of acrylic monomers generate acrylic ester copolymer.
No siloxane C! C double bond of characteristic absorption peak, one absorption peak at 770 cm - 1 (corresponding to the 760 cm - 1) siloxane monomer, pure acrylic polymer in here no absorption, in addition in 3022 ~ 3700 cm - 1 no absorption peak, that can mean organic silicon polymer without Si - OH, namely polymer hydrolysis.
DSC analysis. In polymerization, organic siloxane and copolymerization of acrylic monomers or from together, can also use the DSC analysis. If it is the coexistence of homopolymer and copolymer system, the DSC figure appears on more than two transition temperature.
Within the scope of the - 20 ~ 150 ℃, there is only one glass transition temperature curve, therefore, may think that there is no corresponding homopolymer. Combined with FTIR and DSC analysis result shows that the organic siloxane and acrylate monomers copolymerization reaction is happened in the process of reaction without acrylate are gathered, organic silicon monomer from poly and silane hydrolysis and polycondensation.
The effect of functional monomer on the membrane crosslinking degree. The introduction of the functional monomer can effectively improve the performance of the acrylic resin. The three kinds of functional monomer on the influence of coating crosslinking degree, found that the crosslinking density of coating with three kinds of monomer mass fraction were related, when the mass fraction of HEMA certain, the crosslinking density of coating increased with the increase of the amount of NMA and 1706; When the NMA and 1706 quality scores are certain, the interlinking degree of the coating increases with the amount of HEMA, and the reason is that all three of these monomers have interlinked groups.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
As thermosetting coating, the crosslinking agent used in the direct influence on the performance of the electrodeposition bath and coating various. Now commonly used technology is enclosed in the cationic acrylic resin isocyanate crosslinking agent, but a process complicated and difficult to control product quality, the emulsion particle size is big, poor stability of bath. Organic siloxane with low glass transition temperature and low surface tension and other excellent properties. The organic siloxane modified acrylic resin, may obtain takes both excellent properties of the resin, and can realize one-component self crosslinking, thus overcome the crosslinking agent and resin reaction or blending.
The effect of the polymerization temperature on the dispersed liquid particle size and its distribution. Dispersion particle size of dispersion viscosity, film forming conditions and coating properties have great influence, with the increase of particle size, the viscosity of the dispersion and stability were lower [9]; The luster of the coating, water resistance, hardness, dispersion, and the adhesion strength of the pigment is reduced, and the coating drying time, gas permeability is extended or increase with the increase of particle size.
Experiment found that the polymerization temperature is the biggest factor that influence the dispersion particle size and its distribution. Figure 1 as the other conditions at the same time, different temperature dispersion preparation by the particle size and its distribution.
75 ℃ by dispersion of the preparation of colloidal particle size distribution in 172 ~ 176 nm range, the average particle size was 174.3 nm (light scattering instrument automatic display data), 85 ℃ when the preparation of the dispersion of colloidal particle size distribution in 20 ~ 25 nm range, the average particle size was 23.2 nm, 95 ℃ by dispersion of the preparation of colloidal particle size distribution is wide, mostly in 80 ~ 150 nm range, the average particle size of 105.4 nm. So the best polymerization temperature is 85 ℃ in the system.
The reason is that there are more of them in the lower temperature; High temperature increase trend of siloxane hydrolysis, system has a greater difference between two kinds of structure and polarity particles, leads to wider particle size distribution. Combined with figure 2 actual electron micrograph of a dispersion particles can be seen that the preparation of the particles at three temperatures are irregular shape, particle size consistent with the results of the laser scattering instrument to measure.
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
The characteristics of organosiloxane are strongly absorbed in between 1100 and 1000cm - 1, and in 1000 ~ 667, 1650 ~ 1580, 3100 ~ 3000cm - 1 produces the C = C key feature absorption band (figure 4).
At 1734 cm - 1 acrylate is a class C = O stretching vibration peak, 1170 cm - 1 appear acrylate is a class C, O, C stretching vibration peak, 2960, 2876 cm - 1 methyl, methylene characteristic absorption peak, respectively shows that participate in the polymerization of acrylic monomers generate acrylic ester copolymer.
No siloxane C! C double bond of characteristic absorption peak, one absorption peak at 770 cm - 1 (corresponding to the 760 cm - 1) siloxane monomer, pure acrylic polymer in here no absorption, in addition in 3022 ~ 3700 cm - 1 no absorption peak, that can mean organic silicon polymer without Si - OH, namely polymer hydrolysis.
DSC analysis. In polymerization, organic siloxane and copolymerization of acrylic monomers or from together, can also use the DSC analysis. If it is the coexistence of homopolymer and copolymer system, the DSC figure appears on more than two transition temperature.
Within the scope of the - 20 ~ 150 ℃, there is only one glass transition temperature curve, therefore, may think that there is no corresponding homopolymer. Combined with FTIR and DSC analysis result shows that the organic siloxane and acrylate monomers copolymerization reaction is happened in the process of reaction without acrylate are gathered, organic silicon monomer from poly and silane hydrolysis and polycondensation.
The effect of functional monomer on the membrane crosslinking degree. The introduction of the functional monomer can effectively improve the performance of the acrylic resin. The three kinds of functional monomer on the influence of coating crosslinking degree, found that the crosslinking density of coating with three kinds of monomer mass fraction were related, when the mass fraction of HEMA certain, the crosslinking density of coating increased with the increase of the amount of NMA and 1706; When the NMA and 1706 quality scores are certain, the interlinking degree of the coating increases with the amount of HEMA, and the reason is that all three of these monomers have interlinked groups.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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