News Details
Paint the dosage of crosslinking agent
2017-3-10 22:09:50
Paint the dosage of crosslinking agent, film hardness decreases first increase in the amount of crosslinking agent, then decreases, and the 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.
Too much when the dosage of crosslinking agent, the cross-linking of crosslinking reaction after there will be a crosslinking agent remaining, and the rest of the crosslinking agent molecules in the coating is equivalent to the effect of plasticizer, will reduce the coating hardness, with fewer dosage of crosslinking agent, crosslinking rest after crosslinking the amount of crosslinking agent, plasticizing effect is abate, the coating hardness increase.
, when the dosage of crosslinking agent is too small due to the lack of crosslinking agent leads to lower coating crosslinking density, coating hardness and reduced, therefore, the suitable dosage of crosslinking agent for the coating hardness has provided a guarantee.
Coating of water absorption and water resistance has a great influence on the anticorrosive performance of the coating, the coating of the bibulous rate, the greater the resistance to water, anti-corrosion performance is poor.
Coating bibulous rate with the solid agent dosage reduction, increase with the decrease of the first. When the dosage of crosslinking agent is too large, after crosslinking with the rest of the crosslinking agent in coatings, waterborne epoxy coatings used by crosslinking agent has very strong hydrophilic, coating bibulous rate is bigger, with fewer dosage of crosslinking agent, bibulous rate is lower.
But when the dosage of crosslinking agent, this can happen crosslinking crosslinked epoxide group failed to crosslinking reaction, resulting in a decline in resin crosslinking density and the density of the coating is not enough, bibulous rate is 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. Other scales, coating water resistant time are more than 264 h, can meet the requirements of general industrial coatings of water resistance.
When the dosage of crosslinking agent is not at the same time, the phenomenon of salt fog resistance time and different, with the increase of the dosage of crosslinking agent, salt fog resistance time increased first and then decreased.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
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 (cross-linking agent) = 4.5:1, the longest neutral salt fog resistance, and board face blister, rust free.
Under different frequencies, the changing rule of the alternating current impedance value basic for a smooth curve, and from high frequency to low frequency, ac impedance values to rapidly increase, gentle increase until after the basic stable.
Appropriately when the dosage of crosslinking agent, the crosslinking density of waterborne epoxy resin achieved a certain degree, and the least amount of crosslinking agent, excess is highest when the ac impedance values; When the dosage of crosslinking agent is large, the remaining amounts of crosslinking agent, the coating hydrophilic crosslinking agent leads to ac impedance value is reduced greatly.
With the increase of immersion time, | Z | 0.01 basic trend first slightly lower, rise again, and reduce. At the beginning of the test plate soak, due to the microporous coating for salt water seeping into the internal pipeline, brine through these pipes to the inside coating permeability slowly, causing | Z | 0.01 slightly lower.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Too much when the dosage of crosslinking agent, the cross-linking of crosslinking reaction after there will be a crosslinking agent remaining, and the rest of the crosslinking agent molecules in the coating is equivalent to the effect of plasticizer, will reduce the coating hardness, with fewer dosage of crosslinking agent, crosslinking rest after crosslinking the amount of crosslinking agent, plasticizing effect is abate, the coating hardness increase.
, when the dosage of crosslinking agent is too small due to the lack of crosslinking agent leads to lower coating crosslinking density, coating hardness and reduced, therefore, the suitable dosage of crosslinking agent for the coating hardness has provided a guarantee.
Coating of water absorption and water resistance has a great influence on the anticorrosive performance of the coating, the coating of the bibulous rate, the greater the resistance to water, anti-corrosion performance is poor.
Coating bibulous rate with the solid agent dosage reduction, increase with the decrease of the first. When the dosage of crosslinking agent is too large, after crosslinking with the rest of the crosslinking agent in coatings, waterborne epoxy coatings used by crosslinking agent has very strong hydrophilic, coating bibulous rate is bigger, with fewer dosage of crosslinking agent, bibulous rate is lower.
But when the dosage of crosslinking agent, this can happen crosslinking crosslinked epoxide group failed to crosslinking reaction, resulting in a decline in resin crosslinking density and the density of the coating is not enough, bibulous rate is 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. Other scales, coating water resistant time are more than 264 h, can meet the requirements of general industrial coatings of water resistance.
When the dosage of crosslinking agent is not at the same time, the phenomenon of salt fog resistance time and different, with the increase of the dosage of crosslinking agent, salt fog resistance time increased first and then decreased.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
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 (cross-linking agent) = 4.5:1, the longest neutral salt fog resistance, and board face blister, rust free.
Under different frequencies, the changing rule of the alternating current impedance value basic for a smooth curve, and from high frequency to low frequency, ac impedance values to rapidly increase, gentle increase until after the basic stable.
Appropriately when the dosage of crosslinking agent, the crosslinking density of waterborne epoxy resin achieved a certain degree, and the least amount of crosslinking agent, excess is highest when the ac impedance values; When the dosage of crosslinking agent is large, the remaining amounts of crosslinking agent, the coating hydrophilic crosslinking agent leads to ac impedance value is reduced greatly.
With the increase of immersion time, | Z | 0.01 basic trend first slightly lower, rise again, and reduce. At the beginning of the test plate soak, due to the microporous coating for salt water seeping into the internal pipeline, brine through these pipes to the inside coating permeability slowly, causing | Z | 0.01 slightly lower.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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