News Details
Small molecule paint crosslinking agent
2017-5-21 23:47:39
Small molecule paint crosslinking agent
N (-nc0) : n (-0h) : the effect of n (-0h) on the permeability of the coating cloth. Use HPAN as crosslinking agent reaction occurs mainly on the side of the PU pre polymers, therefore, n (- NC0) : n (0 h) is larger (> 1), the lower the molecular weight of the polymers, the higher end group concentration, the higher the crosslinking density of the coating, the coating resistant to water pressure value increases.
, on the other hand, HPAN molecular chain folding ability drop after crosslinking, and PPG molecular chain of HPAN molecular chain and isolation effect, all of these promote the water molecules and the affinity coating and penetration of the coating, to improve the moisture permeability of the coating cloth, N (-nc0) : n (-0h) is greater than 1.7:1, the crosslinking density is too high, and the permeability of the coating decreases. Therefore, considering the factors in 2.1 and 2.2, n (-nc0) : n (-0h) should be 1.7:1.
The influence of PEG and PPG molecular weight on the wet performance of the coating. PEG and PPG are two types of low polymer polyols commonly used in polyurethane industry, and their molecular weight is affected by the moisture permeability of coating.
The molecular weight of polyols is low, which is favorable for higher water pressure value. Polyol composition of high molecular weight to obtain higher moisture transmission advantage. Therefore, in the same n (- NC0) : n (0 h), the higher the molecular weight of polyols component, advance the higher molecular weight polymers. The quality score of the soft chain segment is higher, the crosslinking density of the coating decreases, the moisture permeability increases, and the water pressure value decreases.
Therefore, in the synthesis of PU prepolymer, it is advisable to use a PEG or PPG polyol component of 1000.
Effect of PPG % (quality score) on fabric coating performance. Compared with PEG, poor hydrophilicity of PPG. In the synthesis of PU coating, add part of PPG, is helpful to improve the performance of resistance to water pressure on the coating. Coating layer water pressure resistance value of the comprehensive reflects the water resistance, mechanical properties, and many other factors.
While PPG % below 30% (mass fraction), with the increase of PPG %, resistance to water pressure value of the coating cloth and moisture transmission increases at the same time. This is because the molecular chain of PPG rigid PEG is high, a small amount of PPG can improve the strength of the coating film, reduce the hydrophilicity of coating, is advantageous to the release of water molecules has penetrated into the coating.
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
And 2.2 above and the "isolation" and conducive to the formation of "instant pore", the two function can improve the coating permeability at the same time. But the excessive use of PPG, resistance to water pressure value reduced. After the PPG % more than 70% (mass fraction), the hydrophilic coating is too low, moisture capacity was also significantly lower.
Therefore, when preparing PU prepolymer, the mixture of PEG1000 and PPG1000 is suitable for the polyol component, and the PPGl000 quality score is 70%.
The effect of the chain reaction on the moisture permeability of the coating. 1, 4-butanol (1, 4-bg), dihydroxymethyl propionate (DHMPA), water, etc., and the effect of the chain agent on PU coating properties.
The PPGl000 / PEG1000 mixture is a polyol component, and the PPGl000 content is 70% (quality score). The prepolymerization (nt-nc0) : n (-0h) is 1.7:1; In the chain reaction, n (-nc0) : n (the extender) is 0.25:1.
Under the process condition of 1.2, the coating agent of PU prepolymerization system with unexpanded chain is used, and the synthetic process is simple, and the PU coating cloth is made of waterproof and permeable.
The end basis of PU prepolymer is affected by the moisture permeability of coating. The synthesis of polyurethane prepolymer has the polymer of the reactive group, and the type and quantity of the end group have a large effect on the crosslinking effect. The end of the hydroxyl PU with the iron anchor 101 adhesive B. The end amino PU is cross-linked with HPAN.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
N (-nc0) : n (-0h) : the effect of n (-0h) on the permeability of the coating cloth. Use HPAN as crosslinking agent reaction occurs mainly on the side of the PU pre polymers, therefore, n (- NC0) : n (0 h) is larger (> 1), the lower the molecular weight of the polymers, the higher end group concentration, the higher the crosslinking density of the coating, the coating resistant to water pressure value increases.
, on the other hand, HPAN molecular chain folding ability drop after crosslinking, and PPG molecular chain of HPAN molecular chain and isolation effect, all of these promote the water molecules and the affinity coating and penetration of the coating, to improve the moisture permeability of the coating cloth, N (-nc0) : n (-0h) is greater than 1.7:1, the crosslinking density is too high, and the permeability of the coating decreases. Therefore, considering the factors in 2.1 and 2.2, n (-nc0) : n (-0h) should be 1.7:1.
The influence of PEG and PPG molecular weight on the wet performance of the coating. PEG and PPG are two types of low polymer polyols commonly used in polyurethane industry, and their molecular weight is affected by the moisture permeability of coating.
The molecular weight of polyols is low, which is favorable for higher water pressure value. Polyol composition of high molecular weight to obtain higher moisture transmission advantage. Therefore, in the same n (- NC0) : n (0 h), the higher the molecular weight of polyols component, advance the higher molecular weight polymers. The quality score of the soft chain segment is higher, the crosslinking density of the coating decreases, the moisture permeability increases, and the water pressure value decreases.
Therefore, in the synthesis of PU prepolymer, it is advisable to use a PEG or PPG polyol component of 1000.
Effect of PPG % (quality score) on fabric coating performance. Compared with PEG, poor hydrophilicity of PPG. In the synthesis of PU coating, add part of PPG, is helpful to improve the performance of resistance to water pressure on the coating. Coating layer water pressure resistance value of the comprehensive reflects the water resistance, mechanical properties, and many other factors.
While PPG % below 30% (mass fraction), with the increase of PPG %, resistance to water pressure value of the coating cloth and moisture transmission increases at the same time. This is because the molecular chain of PPG rigid PEG is high, a small amount of PPG can improve the strength of the coating film, reduce the hydrophilicity of coating, is advantageous to the release of water molecules has penetrated into the coating.
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
And 2.2 above and the "isolation" and conducive to the formation of "instant pore", the two function can improve the coating permeability at the same time. But the excessive use of PPG, resistance to water pressure value reduced. After the PPG % more than 70% (mass fraction), the hydrophilic coating is too low, moisture capacity was also significantly lower.
Therefore, when preparing PU prepolymer, the mixture of PEG1000 and PPG1000 is suitable for the polyol component, and the PPGl000 quality score is 70%.
The effect of the chain reaction on the moisture permeability of the coating. 1, 4-butanol (1, 4-bg), dihydroxymethyl propionate (DHMPA), water, etc., and the effect of the chain agent on PU coating properties.
The PPGl000 / PEG1000 mixture is a polyol component, and the PPGl000 content is 70% (quality score). The prepolymerization (nt-nc0) : n (-0h) is 1.7:1; In the chain reaction, n (-nc0) : n (the extender) is 0.25:1.
Under the process condition of 1.2, the coating agent of PU prepolymerization system with unexpanded chain is used, and the synthetic process is simple, and the PU coating cloth is made of waterproof and permeable.
The end basis of PU prepolymer is affected by the moisture permeability of coating. The synthesis of polyurethane prepolymer has the polymer of the reactive group, and the type and quantity of the end group have a large effect on the crosslinking effect. The end of the hydroxyl PU with the iron anchor 101 adhesive B. The end amino PU is cross-linked with HPAN.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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