News Details
The film is coated with crosslinking agent
2017-8-24 16:54:44
The film is coated with crosslinking agent
Coating beam with the coating hardness after use, reduce the first increase in the amount of crosslinking agent is reduced, the coating with crosslinking agent is too much or too small will reduce the coating hardness, in order to ensure the coating hardness is ideal, to be a suitable dosage of crosslinking agent.
The water absorption rate and water resistance of the coating have great influence on the corrosion resistance of the coating. The higher the absorption rate of the coating, the worse the water resistance and the worse the anti-corrosion performance.
With the decrease of the dosage of the fixing agent, the film absorption rate decreased and then increased.DangTu membrane with excessive dosage of crosslinking agent, the crosslinking of the coating in the rest of the crosslinking agent, crosslinking agent used by waterborne epoxy coatings has a strong hydrophilic, coating bibulous rate is larger, with fewer dosage of crosslinking agent, bibulous rate is lower.
However, when the dosage of crosslinking agent was too low, the epoxy group that could have been crosslinked could not be cross-linked, leading to the decrease of the density of the resin crosslinking, the density of the coating was not enough, and the water absorption rate increased.When m (epoxy emulsion) : m (cross-linking agent) = 4.5:1, the coating is bibulous rate is relatively low, under the ratio of waterborne epoxy coatings epoxy resins and crosslinking agent can maximize the crosslinking crosslinking, and the rest of the hydrophilic crosslinking agent is controlled in a certain degree, bibulous rate is low.
Too much when the dosage of crosslinking agent, coating with poor resistance to water, soaking in 120 h, the coating surface is relatively dense vesicle, this shows that in the coating did not attend the rest of crosslinking reaction of the crosslinking agent on water resistance effect is larger.In the other proportion, the coating water resistance time exceeds 264h, which can meet the water resistance of general industrial coatings.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
Coating beam with the coating hardness after use, reduce the first increase in the amount of crosslinking agent is reduced, the coating with crosslinking agent is too much or too small will reduce the coating hardness, in order to ensure the coating hardness is ideal, to be a suitable dosage of crosslinking agent.
The water absorption rate and water resistance of the coating have great influence on the corrosion resistance of the coating. The higher the absorption rate of the coating, the worse the water resistance and the worse the anti-corrosion performance.
With the decrease of the dosage of the fixing agent, the film absorption rate decreased and then increased.DangTu membrane with excessive dosage of crosslinking agent, the crosslinking of the coating in the rest of the crosslinking agent, crosslinking agent used by waterborne epoxy coatings has a strong hydrophilic, coating bibulous rate is larger, with fewer dosage of crosslinking agent, bibulous rate is lower.
However, when the dosage of crosslinking agent was too low, the epoxy group that could have been crosslinked could not be cross-linked, leading to the decrease of the density of the resin crosslinking, the density of the coating was not enough, and the water absorption rate increased.When m (epoxy emulsion) : m (cross-linking agent) = 4.5:1, the coating is bibulous rate is relatively low, under the ratio of waterborne epoxy coatings epoxy resins and crosslinking agent can maximize the crosslinking crosslinking, and the rest of the hydrophilic crosslinking agent is controlled in a certain degree, bibulous rate is low.
Too much when the dosage of crosslinking agent, coating with poor resistance to water, soaking in 120 h, the coating surface is relatively dense vesicle, this shows that in the coating did not attend the rest of crosslinking reaction of the crosslinking agent on water resistance effect is larger.In the other proportion, the coating water resistance time exceeds 264h, which can meet the water resistance of general industrial coatings.
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.
When the dosage of crosslinking agent is different, the time and phenomenon of salt-tolerant fog are different. As the dosage of crosslinking agent increases, the salt spray time increases first and then decreases.When the dosage of the cross-linking agent is small, this can happen crosslinking reaction of epoxy groups failed to participate in the reaction due to lack of crosslinking agent, coating crosslinking density is low, water vapor easy to permeate to the bottom of the coating, resistant to salt spray time is shorter, try board will appear earlier some rust.
When the dosage of crosslinking agent value too much, there will be a part of the remaining after coating crosslinked crosslinking of crosslinking agent, crosslinking agent with strong hydrophilic, for water vapor infiltration coating internal channels, so the resistance to salt spray time is shorter, board face earlier will appear some bubbles and rust.When m (epoxy emulsion) : m (crosslinking agent) = 4.5:1, the time of resistance to neutral salt fog is the longest, and the surface has no blister and rust spots.
At different frequencies, the change rule of ac impedance value is basically a smooth curve, and from high frequency to low frequency, the ac impedance value increases rapidly and then gradually increases to basically stable.
When the dosage of crosslinking agent is appropriate, the crosslinking density of the water-borne epoxy resin reaches a certain degree, and the excess crosslinking agent is the least, when the ac impedance value is highest.When the dosage of crosslinking agent is high, the residual amount of crosslinking agent in the coating will lead to a significant reduction in the ac impedance value.
With the increase of soaking time, the basic change trend of | Z | 0.01 was reduced slightly, then increased, then decreased.In the initial stage of the test plate immersion, as the micropore of the coating provided the pipeline through the salt water, the salt water permeated through these pipes slowly, resulting in a slight decrease in | Z | 0.01.
A certain amount of diglycol, dibasic acid and catalyst are put into the reactor and stirred evenly.Recanalization in nitrogen, heats up to 220 ° C polycondensation reaction time, join the acidolysis agent to adjust acid value, and then pumping air into vacuum state, controlled polymerization end point, add antioxidant, cooling, acid value, viscosity conform to the requirements of the new type end carboxyl polyester resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
When the dosage of crosslinking agent is different, the time and phenomenon of salt-tolerant fog are different. As the dosage of crosslinking agent increases, the salt spray time increases first and then decreases.When the dosage of the cross-linking agent is small, this can happen crosslinking reaction of epoxy groups failed to participate in the reaction due to lack of crosslinking agent, coating crosslinking density is low, water vapor easy to permeate to the bottom of the coating, resistant to salt spray time is shorter, try board will appear earlier some rust.
When the dosage of crosslinking agent value too much, there will be a part of the remaining after coating crosslinked crosslinking of crosslinking agent, crosslinking agent with strong hydrophilic, for water vapor infiltration coating internal channels, so the resistance to salt spray time is shorter, board face earlier will appear some bubbles and rust.When m (epoxy emulsion) : m (crosslinking agent) = 4.5:1, the time of resistance to neutral salt fog is the longest, and the surface has no blister and rust spots.
At different frequencies, the change rule of ac impedance value is basically a smooth curve, and from high frequency to low frequency, the ac impedance value increases rapidly and then gradually increases to basically stable.
When the dosage of crosslinking agent is appropriate, the crosslinking density of the water-borne epoxy resin reaches a certain degree, and the excess crosslinking agent is the least, when the ac impedance value is highest.When the dosage of crosslinking agent is high, the residual amount of crosslinking agent in the coating will lead to a significant reduction in the ac impedance value.
With the increase of soaking time, the basic change trend of | Z | 0.01 was reduced slightly, then increased, then decreased.In the initial stage of the test plate immersion, as the micropore of the coating provided the pipeline through the salt water, the salt water permeated through these pipes slowly, resulting in a slight decrease in | Z | 0.01.
A certain amount of diglycol, dibasic acid and catalyst are put into the reactor and stirred evenly.Recanalization in nitrogen, heats up to 220 ° C polycondensation reaction time, join the acidolysis agent to adjust acid value, and then pumping air into vacuum state, controlled polymerization end point, add antioxidant, cooling, acid value, viscosity conform to the requirements of the new type end carboxyl polyester resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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