News Details
Waterborne polyamide coatings crosslinking agent
2017-7-27 23:51:23
Waterborne polyamide coatings crosslinking agent
Using condensation of dimer acid and amine to the preparation of waterborne polyamide crosslinking agent, such modification can improve the compatibility with epoxy resin, coating surface also won't appear due to incompatible surface defects.
But use water-based epoxy crosslinking agent polyamide crosslinking agent emulsification system of epoxy resin applicable period is shorter, generally not more than one hour will be gelation, for floor construction will bring some trouble. In addition, the film of polyamide crosslinking is poor, the anti-impact performance is poor and the film is brittle.
Aqueous dimeric dibasic acid polyamide crosslinking agent due to the composition of the existence of unsaturated double bond and easy oxidation by oxygen in the air cause crosslinking agent of darker color, not suitable for as to demand higher color waterborne epoxy floor coating materials as crosslinking agent.
By the amidation polyamine and polyamide water crosslinking agent crosslinked coating defects more or less, and coating properties of modified and no obvious improvement, therefore the waterborne epoxy crosslinking agent for foreign multiple amine - epoxy adduct, using epoxy resin react with multiple amine, in multiple amine chain into epoxy resin molecule chain of making synthetic after crosslinking agent with the molecular structure of the epoxy resin, reduce crosslinking agent molecules can obviously reduce the content of primary amine groups in the activity of the crosslinking agent, make use of this type of waterborne epoxy crosslinking agent of emulsified epoxy system applicable period is extended.
By adding polyoxyalkyl polyamine, the problem of coating was improved. If the waterborne epoxy cross-linking agent has the function of emulsifying epoxy resin, it should be obtained by introducing an alkyl chain segment or ionic group in the crosslinking agent chain.
Polyamide containing amide groups for macromolecular chain structure of repeat unit of the polymers, mainly composed of diamine and dibasic acid condensation or composed of amino acids lactam from polymerization, commonly known as Nylon, English name for Polyamide or Nylon. Polyamide, for short, is now the largest generic engineering plastic variety.
Polyamides include a variety of species, specifically polyamide W, where T stands for the number of carbon atoms of didylamine, and y is the number of carbon atoms of diatomic acid. According to the main chain structure of polyamide, it can be divided into fatty polyamide, semi-aromatic polyamide, all-aromatic polyamide, heterocyclic aromatic polyamide and lipid-ring polyamide.
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
Using condensation of dimer acid and amine to the preparation of waterborne polyamide crosslinking agent, such modification can improve the compatibility with epoxy resin, coating surface also won't appear due to incompatible surface defects.
But use water-based epoxy crosslinking agent polyamide crosslinking agent emulsification system of epoxy resin applicable period is shorter, generally not more than one hour will be gelation, for floor construction will bring some trouble. In addition, the film of polyamide crosslinking is poor, the anti-impact performance is poor and the film is brittle.
Aqueous dimeric dibasic acid polyamide crosslinking agent due to the composition of the existence of unsaturated double bond and easy oxidation by oxygen in the air cause crosslinking agent of darker color, not suitable for as to demand higher color waterborne epoxy floor coating materials as crosslinking agent.
By the amidation polyamine and polyamide water crosslinking agent crosslinked coating defects more or less, and coating properties of modified and no obvious improvement, therefore the waterborne epoxy crosslinking agent for foreign multiple amine - epoxy adduct, using epoxy resin react with multiple amine, in multiple amine chain into epoxy resin molecule chain of making synthetic after crosslinking agent with the molecular structure of the epoxy resin, reduce crosslinking agent molecules can obviously reduce the content of primary amine groups in the activity of the crosslinking agent, make use of this type of waterborne epoxy crosslinking agent of emulsified epoxy system applicable period is extended.
By adding polyoxyalkyl polyamine, the problem of coating was improved. If the waterborne epoxy cross-linking agent has the function of emulsifying epoxy resin, it should be obtained by introducing an alkyl chain segment or ionic group in the crosslinking agent chain.
Polyamide containing amide groups for macromolecular chain structure of repeat unit of the polymers, mainly composed of diamine and dibasic acid condensation or composed of amino acids lactam from polymerization, commonly known as Nylon, English name for Polyamide or Nylon. Polyamide, for short, is now the largest generic engineering plastic variety.
Polyamides include a variety of species, specifically polyamide W, where T stands for the number of carbon atoms of didylamine, and y is the number of carbon atoms of diatomic acid. According to the main chain structure of polyamide, it can be divided into fatty polyamide, semi-aromatic polyamide, all-aromatic polyamide, heterocyclic aromatic polyamide and lipid-ring polyamide.
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
The prominent features of polyamide are excellent wear resistance, friction and self-lubricity, good mechanical properties, excellent oil resistance, good gas barrier and good fatigue resistance.
The presence of amides in polyamide can form hydrogen bonds in the middle of large molecules, so as to increase the intermolecular force and give the polyamide a high melting point and mechanical property, while also increasing the water absorption rate.
The methylene in polyamide, which gives polyamide the flexibility and impact. The greater the proportion of methylene/amide groups in polyamide, the less hydrogen bonds in the molecules, the smaller the molecular forces, the more flexible the molecules and the smaller the absorption of water.
The amide group of polyamide is arranged in order, so that it can be crystallized under the appropriate conditions, and the crystallinity can reach 50% ~ 60% range. Polyamide crystals have. Alpha, beta, gamma, polyamide 6, alpha, gamma, polyamide 66, alpha and beta.
In the performance of polyamide, there is a parity effect of methylene. When the number of methylene is even this odd high melting point, such as polyamide (230 ℃), the melting point of 7 but higher than that of polyamide 6 (215 ℃). This is because the hydrogen-bond density of the methylene is even when it is even, and the crystalline structure of the two is also different.
The appearance of general performance polyamide is transparent or opaque milky white or yellowish granule, the appearance is horny, hard, the product surface has the luster. The water absorption rate of polyamide is relatively large, the proportion of amide bonds is larger, and the higher the water absorption rate is, the concrete is polyamide 6 > polyamide 66 > polyamide 610 > polyamide l010 > polyamide l2 > polyamide l212.
Polyamide is a self-extinguishing plastic that burns with the smell of wool or fingernails. Polyamides are moderately obstructive plastic and increase with the proportion of amide/methylene, and the barrier effect of polyamide 6 is the best. The O2 transmission coefficient of polyamide 6 is 25 ~ 40cm · mm/(m · d · m polyamide), the transmission coefficient of CO2 is 150 ~ 200cm · mm/(m · d · m polyamide), the transmission coefficient of H2O is 150cm · mm/(m · d · m polyamide).
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The prominent features of polyamide are excellent wear resistance, friction and self-lubricity, good mechanical properties, excellent oil resistance, good gas barrier and good fatigue resistance.
The presence of amides in polyamide can form hydrogen bonds in the middle of large molecules, so as to increase the intermolecular force and give the polyamide a high melting point and mechanical property, while also increasing the water absorption rate.
The methylene in polyamide, which gives polyamide the flexibility and impact. The greater the proportion of methylene/amide groups in polyamide, the less hydrogen bonds in the molecules, the smaller the molecular forces, the more flexible the molecules and the smaller the absorption of water.
The amide group of polyamide is arranged in order, so that it can be crystallized under the appropriate conditions, and the crystallinity can reach 50% ~ 60% range. Polyamide crystals have. Alpha, beta, gamma, polyamide 6, alpha, gamma, polyamide 66, alpha and beta.
In the performance of polyamide, there is a parity effect of methylene. When the number of methylene is even this odd high melting point, such as polyamide (230 ℃), the melting point of 7 but higher than that of polyamide 6 (215 ℃). This is because the hydrogen-bond density of the methylene is even when it is even, and the crystalline structure of the two is also different.
The appearance of general performance polyamide is transparent or opaque milky white or yellowish granule, the appearance is horny, hard, the product surface has the luster. The water absorption rate of polyamide is relatively large, the proportion of amide bonds is larger, and the higher the water absorption rate is, the concrete is polyamide 6 > polyamide 66 > polyamide 610 > polyamide l010 > polyamide l2 > polyamide l212.
Polyamide is a self-extinguishing plastic that burns with the smell of wool or fingernails. Polyamides are moderately obstructive plastic and increase with the proportion of amide/methylene, and the barrier effect of polyamide 6 is the best. The O2 transmission coefficient of polyamide 6 is 25 ~ 40cm · mm/(m · d · m polyamide), the transmission coefficient of CO2 is 150 ~ 200cm · mm/(m · d · m polyamide), the transmission coefficient of H2O is 150cm · mm/(m · d · m polyamide).
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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