News Details
Composition of coating crosslinking agent
2017-5-18 17:49:27
Composition of coating crosslinking agent:
It is often a substance containing many functional groups, such as organic diacid, polyol, etc. Or molecules containing multiple unsaturated double bonds, such as diethylbenzene and diisocyanate, N, n-methyl-diacrylamide (MBA), etc.
It can be made with monomer to be condensed (or polymerized) to a certain degree of cross-linking, making the product into an insoluble cross-linked polymer; Also can keep a certain number of functional groups in linear molecules (or double bond) and then add certain substances to crosslinking, such as the curing of phenolic resin and rubber vulcanization, etc.
Powerful nitrogen-propyl cross-linking agent such as sac-100, un-7, multifunctional polycarbonized diamines crosslinking agent such as un-557, closed crosslinking agent un-125f, etc.
Synthesis of electrostatic flocking crosslinking agent. With reflux condenser, mixer, the 500 ml of the thermometer three flask, first add melamine 27 g, formaldehyde (36% ~ 37%), 106 g, stirring, heating up to 55 ℃ make melamine completely dissolved form transparent liquid, with borax aqueous solution to adjust pH value to 8.0 ~ 8.0, and slowly heat up to 65 ℃, 1 h insulation, add 3 g urea, continue to heat preservation 0.5 h, produce white paste, stir and add methanol, 50 g with oxalic acid to adjust pH value to 5.0 ~ 5.5, the reaction temperature to 70 ℃, to dissolve the white paste transparent after decompression steamed out redundant formaldehyde, a mixture of methanol and water, adding and steamed out of the same volume of water, cooling after discharging.
The product is transparent viscous liquid, the solid content is about 40%, the density is about l. 10g/mL.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Crosslinking agent is an essential ingredient in electrostatic flocking process, which can increase the wear-resisting fastness and softness of static flocking products. Now the commonly used crosslinking agent has imported FH and domestic P, the cost is higher. This product is low in price, good performance, the wet grinding of the flock is more than 1000 times, and the dry grinding is more than 3,000 times, and the hand feels soft.
A possible source of impurities is detected and excluded. Therefore we infer that there must be a transfer of sulfur from the body to the surface area, and may be caused by thermodynamic separation. Previous article we believe that the sulfur concentration peak appeared in surface layer is caused by overlapping of two effects: sulfur-containing substance from structural adhesive ontology to exposure to air on the surface of the diffusion and subsequent (sometimes) at the same time by air with the consumption of thermal oxidation of volatiles conversion.
This is the exact explanation for the peak of concentration in some conditions on the surface rather than on the surface. Under high oxygen concentration, the diffusion of the sulfide subsurface to the surface is slightly slower than the surface oxidation rate and subsequent S02 release velocity.
This could also explain the fact that the peak concentration of sulfur observed in higher oxygen levels is moving away from the surface of the polymer. Aging under low oxygen partial pressure, there is also HanLiuFen son from ontology to the spread of the surface, but these molecules do not translate into volatile matter: but gathered at the surface.
This can not only explain the sample surface after aging under low oxygen partial pressure of sulfur high density (13%, 2%, compared to the initial or the 5%) obtained in air aging, and peak appeared on the surface of the phenomenon can be explained. The peak of sulfur concentration is observed in a high vacuum. This phenomenon is caused by the release of sulfur-bearing segments of the surface under high vacuum conditions which are volatile and leave the polymer when ageing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
It is often a substance containing many functional groups, such as organic diacid, polyol, etc. Or molecules containing multiple unsaturated double bonds, such as diethylbenzene and diisocyanate, N, n-methyl-diacrylamide (MBA), etc.
It can be made with monomer to be condensed (or polymerized) to a certain degree of cross-linking, making the product into an insoluble cross-linked polymer; Also can keep a certain number of functional groups in linear molecules (or double bond) and then add certain substances to crosslinking, such as the curing of phenolic resin and rubber vulcanization, etc.
Powerful nitrogen-propyl cross-linking agent such as sac-100, un-7, multifunctional polycarbonized diamines crosslinking agent such as un-557, closed crosslinking agent un-125f, etc.
Synthesis of electrostatic flocking crosslinking agent. With reflux condenser, mixer, the 500 ml of the thermometer three flask, first add melamine 27 g, formaldehyde (36% ~ 37%), 106 g, stirring, heating up to 55 ℃ make melamine completely dissolved form transparent liquid, with borax aqueous solution to adjust pH value to 8.0 ~ 8.0, and slowly heat up to 65 ℃, 1 h insulation, add 3 g urea, continue to heat preservation 0.5 h, produce white paste, stir and add methanol, 50 g with oxalic acid to adjust pH value to 5.0 ~ 5.5, the reaction temperature to 70 ℃, to dissolve the white paste transparent after decompression steamed out redundant formaldehyde, a mixture of methanol and water, adding and steamed out of the same volume of water, cooling after discharging.
The product is transparent viscous liquid, the solid content is about 40%, the density is about l. 10g/mL.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Crosslinking agent is an essential ingredient in electrostatic flocking process, which can increase the wear-resisting fastness and softness of static flocking products. Now the commonly used crosslinking agent has imported FH and domestic P, the cost is higher. This product is low in price, good performance, the wet grinding of the flock is more than 1000 times, and the dry grinding is more than 3,000 times, and the hand feels soft.
A possible source of impurities is detected and excluded. Therefore we infer that there must be a transfer of sulfur from the body to the surface area, and may be caused by thermodynamic separation. Previous article we believe that the sulfur concentration peak appeared in surface layer is caused by overlapping of two effects: sulfur-containing substance from structural adhesive ontology to exposure to air on the surface of the diffusion and subsequent (sometimes) at the same time by air with the consumption of thermal oxidation of volatiles conversion.
This is the exact explanation for the peak of concentration in some conditions on the surface rather than on the surface. Under high oxygen concentration, the diffusion of the sulfide subsurface to the surface is slightly slower than the surface oxidation rate and subsequent S02 release velocity.
This could also explain the fact that the peak concentration of sulfur observed in higher oxygen levels is moving away from the surface of the polymer. Aging under low oxygen partial pressure, there is also HanLiuFen son from ontology to the spread of the surface, but these molecules do not translate into volatile matter: but gathered at the surface.
This can not only explain the sample surface after aging under low oxygen partial pressure of sulfur high density (13%, 2%, compared to the initial or the 5%) obtained in air aging, and peak appeared on the surface of the phenomenon can be explained. The peak of sulfur concentration is observed in a high vacuum. This phenomenon is caused by the release of sulfur-bearing segments of the surface under high vacuum conditions which are volatile and leave the polymer when ageing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian