News Details
Crosslinking agent class waterborne polyurethane coating
2017-4-9 23:49:38
Crosslinking agent class waterborne polyurethane coating,Some of the silicon coupling agent can be used as waterborne polyurethane crosslinking agent. Organic silicon type waterborne polyurethane crosslinking agent mainly with epoxy and silicone. Epoxy group can react with carboxyl, introducing siloxane base macromolecular chain, through siloxane base hydrolysis, silicon hydroxyl condensation achieve its crosslinking.
Add the crosslinking agent system has the following characteristics: (1) improve the solvent resistance, impact resistance, and scratch resistance; (2) excellent wet and dry adhesion; (3) hard and still have elastic coating; (4) of cured film transparency and color no side effects; (5) high gloss retention after aging.
Of epoxy silane crosslinking chemical mechanism involves two functional groups; Molecules of epoxy resin with carboxyl reaction, and alkoxy part got behind after hydrolysis by polycondensation/silica silicone keys, alkoxy hydrolysis formation of hydroxyl can also improve coating wet adhesion with substrate surface reaction, or improve pigment combined with resin.
Water-based isocyanate is made more aliphatic diisocyanate trimer with nonionic surfactants (such as poly (ethylene oxide) grafting modified synthesis, functionality, 3 ~ 4 solid content is 100%, also can use ester, ketone, aromatic hydrocarbons and ether ester solvent appropriate dilution. Under construction, the components in the manual mixing can be easily dispersed into another component is hydroxyl component.
With its more isocyanate groups can be and water-borne acrylic, water-based polyester or water-based polyurethane polyol compound two-component waterborne polyurethane coatings, its performance is much better than the single-component system, relatively close to the solvent system performance, can be used to emphasize the product performance of coating.
Commonly used crosslinking agent has more than n propyl organism, two imide, carbide and water can be dispersed isocyanate, epoxy resin, amino resin, epoxy siloxane, etc.
Epoxy group is a - CH (O) CH - structure of functionality. Characterized by strong reactivity. The ring opening polymerization or molecular chain growth after addition reaction with other compounds. Containing epoxy group and multiple functional groups of two or more compounds generated after reaction with crosslinking structure is cured, it is epoxy resin and its curing.
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.
As a result of the existence of high tension on three yuan, can make epoxy group under mild conditions with primary amine, thiol and hydroxyl nucleophilic ring opening reaction of reagent, respectively to form secondary amine, sulfide, or ether bond.
According to the chemical properties of the active hydrogen compounds into alkaline compounds (e.g., primary amine, secondary amine, amide, etc.) and acid compounds (such as carboxylic acid, phenol, alcohol, etc.). Their lively hydrogen atoms with epoxy group will produce the following addition reaction.
Alkaline compound according to the mechanism of nucleophilic reaction with epoxy group, generally alkaline big activity, such as fatty amine > aromatic amine. Acidic compounds according to the mechanism of electrophilic reaction with epoxy group, generally acidic big activity, such as carboxylic acid phenol > > alcohol.
Aliphatic primary amine epoxy group and the end of reaction at room temperature can, need not promoter. But a series of proton donor material (such as alcohols, phenols, carboxylic acid, sulfonic acid and water, etc.) will be good reaction.
And proton acceptor material (such as esters, ethers and ketones and nitriles) have inhibitory effect on it. Promote the order as: acid phenol water > alcohol > > nitrile or higher or more aromatic hydrocarbons (benzene, toluene, etc.) > 2 oxygen mixed cyclohexane > diisopropyl ether.
Aromatic amine is smaller than the activity of fatty amine, slow speed and the reaction of epoxy group. Only about 30% of the resin at room temperature for the reaction. This is due to the aromatic amine on the nitrogen atom of asymmetric electrons are partially spread of benzene ring (E effect of benzene nucleus), which reduces the alkaline, and the three-dimensional steric hindrance effect of benzene ring. However, aromatic amine and alicyclic epoxy reaction is faster than fatty amine.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Add the crosslinking agent system has the following characteristics: (1) improve the solvent resistance, impact resistance, and scratch resistance; (2) excellent wet and dry adhesion; (3) hard and still have elastic coating; (4) of cured film transparency and color no side effects; (5) high gloss retention after aging.
Of epoxy silane crosslinking chemical mechanism involves two functional groups; Molecules of epoxy resin with carboxyl reaction, and alkoxy part got behind after hydrolysis by polycondensation/silica silicone keys, alkoxy hydrolysis formation of hydroxyl can also improve coating wet adhesion with substrate surface reaction, or improve pigment combined with resin.
Water-based isocyanate is made more aliphatic diisocyanate trimer with nonionic surfactants (such as poly (ethylene oxide) grafting modified synthesis, functionality, 3 ~ 4 solid content is 100%, also can use ester, ketone, aromatic hydrocarbons and ether ester solvent appropriate dilution. Under construction, the components in the manual mixing can be easily dispersed into another component is hydroxyl component.
With its more isocyanate groups can be and water-borne acrylic, water-based polyester or water-based polyurethane polyol compound two-component waterborne polyurethane coatings, its performance is much better than the single-component system, relatively close to the solvent system performance, can be used to emphasize the product performance of coating.
Commonly used crosslinking agent has more than n propyl organism, two imide, carbide and water can be dispersed isocyanate, epoxy resin, amino resin, epoxy siloxane, etc.
Epoxy group is a - CH (O) CH - structure of functionality. Characterized by strong reactivity. The ring opening polymerization or molecular chain growth after addition reaction with other compounds. Containing epoxy group and multiple functional groups of two or more compounds generated after reaction with crosslinking structure is cured, it is epoxy resin and its curing.
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.
As a result of the existence of high tension on three yuan, can make epoxy group under mild conditions with primary amine, thiol and hydroxyl nucleophilic ring opening reaction of reagent, respectively to form secondary amine, sulfide, or ether bond.
According to the chemical properties of the active hydrogen compounds into alkaline compounds (e.g., primary amine, secondary amine, amide, etc.) and acid compounds (such as carboxylic acid, phenol, alcohol, etc.). Their lively hydrogen atoms with epoxy group will produce the following addition reaction.
Alkaline compound according to the mechanism of nucleophilic reaction with epoxy group, generally alkaline big activity, such as fatty amine > aromatic amine. Acidic compounds according to the mechanism of electrophilic reaction with epoxy group, generally acidic big activity, such as carboxylic acid phenol > > alcohol.
Aliphatic primary amine epoxy group and the end of reaction at room temperature can, need not promoter. But a series of proton donor material (such as alcohols, phenols, carboxylic acid, sulfonic acid and water, etc.) will be good reaction.
And proton acceptor material (such as esters, ethers and ketones and nitriles) have inhibitory effect on it. Promote the order as: acid phenol water > alcohol > > nitrile or higher or more aromatic hydrocarbons (benzene, toluene, etc.) > 2 oxygen mixed cyclohexane > diisopropyl ether.
Aromatic amine is smaller than the activity of fatty amine, slow speed and the reaction of epoxy group. Only about 30% of the resin at room temperature for the reaction. This is due to the aromatic amine on the nitrogen atom of asymmetric electrons are partially spread of benzene ring (E effect of benzene nucleus), which reduces the alkaline, and the three-dimensional steric hindrance effect of benzene ring. However, aromatic amine and alicyclic epoxy reaction is faster than fatty amine.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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