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Paint film with crosslinking agent
2017-7-14 16:11:40
Paint film with crosslinking agent
Isopropenyl esters, such as diisopropenyl adipate, were proposed by Murray et al. In 1995. It can under acidic conditions with hydroxyl-containing water-based polymer reaction, cross-linking cross-linking. And crosslinked at a temperature of more than 100 ° C to obtain a film having good solvent resistance.
Epoxy Crosslinking Agent In the synthesis of waterborne acrylic resins, GMA comonomer is used to introduce an epoxy group on the macromolecule chain and can be crosslinked with the amine salt of the carboxyl group or carboxylic acid in the molecule, Reaction cross-linking. However, this method may cause condensation inside the emulsion particles, resulting in the generation of gel particles, while the epoxy is prone to hydrolysis.
Aziridine (Aziridine) Crosslinker Aziridine crosslinker is a crosslinker developed in the 1970s that provides lower formaldehyde release (compared to amino resins), lower temperatures And can be crosslinked with ammonia-neutralized acrylic resin, such as XAMA-7 cross-linking agent is the use of ethylene imine and trimethylolpropane triacrylate addition reaction of aziridine crosslinked Agent.
Unsaturated bond crosslinking is one of the oldest cross-linking technologies used in alkyd resins and is now being used in aqueous coatings for research and innovation. The double bond of the crosslinking process, first of all oxidation is the formation of peroxy radicals, and then intermolecular crosslinking, driers (cobalt salts) catalytic cross-linking reaction. However, the traditional alkyd resin is dependent on the double bond cross-linking of fatty acids, there are serious shortcomings, one cross-linking reaction time is long, will continue to release harmful gases (aldehydes, ketones); Second, with the film continued Crosslinking, the film will be crisp and yellowed.
The improved method is in the presence of resin, such as acrylic resin, using vinyl monomers such as allyl methacrylate (AL2MA), which can be used for pure acrylic or styrene-acrylic resins, especially styrene, in favor of ALMA Of the copolymer. The same driers (such as cobalt salts) catalyze allyl crosslinking. Its reaction as shown in Figure 6.
Chinese name: Diethyl toluene diamine(DETDA)
Isopropenyl esters, such as diisopropenyl adipate, were proposed by Murray et al. In 1995. It can under acidic conditions with hydroxyl-containing water-based polymer reaction, cross-linking cross-linking. And crosslinked at a temperature of more than 100 ° C to obtain a film having good solvent resistance.
Epoxy Crosslinking Agent In the synthesis of waterborne acrylic resins, GMA comonomer is used to introduce an epoxy group on the macromolecule chain and can be crosslinked with the amine salt of the carboxyl group or carboxylic acid in the molecule, Reaction cross-linking. However, this method may cause condensation inside the emulsion particles, resulting in the generation of gel particles, while the epoxy is prone to hydrolysis.
Aziridine (Aziridine) Crosslinker Aziridine crosslinker is a crosslinker developed in the 1970s that provides lower formaldehyde release (compared to amino resins), lower temperatures And can be crosslinked with ammonia-neutralized acrylic resin, such as XAMA-7 cross-linking agent is the use of ethylene imine and trimethylolpropane triacrylate addition reaction of aziridine crosslinked Agent.
Unsaturated bond crosslinking is one of the oldest cross-linking technologies used in alkyd resins and is now being used in aqueous coatings for research and innovation. The double bond of the crosslinking process, first of all oxidation is the formation of peroxy radicals, and then intermolecular crosslinking, driers (cobalt salts) catalytic cross-linking reaction. However, the traditional alkyd resin is dependent on the double bond cross-linking of fatty acids, there are serious shortcomings, one cross-linking reaction time is long, will continue to release harmful gases (aldehydes, ketones); Second, with the film continued Crosslinking, the film will be crisp and yellowed.
The improved method is in the presence of resin, such as acrylic resin, using vinyl monomers such as allyl methacrylate (AL2MA), which can be used for pure acrylic or styrene-acrylic resins, especially styrene, in favor of ALMA Of the copolymer. The same driers (such as cobalt salts) catalyze allyl crosslinking. Its reaction as shown in Figure 6.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
The polycarbodiimide crosslinker was developed in the 1980s. The purpose of the development of the polycarbodiimide crosslinker is to have the lower crosslinking properties of aziridine and lower toxicity. The polycarbodiimide cross-linking agent is characterized by rapid crosslinking with carboxyl-containing resins (crosslinkable at 30 ° C at 30 ° C), while the reaction rate with water is rather slow. The resulting film has good water resistance and solvent resistance, and can improve the corrosion resistance of the coating.
There are two main factors that affect the mechanism of film crosslinking, one is the diffusion rate of polymer macromolecules, and the other is the crosslinking speed of macromolecules.
If the cross-linking speed is too fast, macromolecules will be too late to spread, can not pass through the latex particles between the intermolecular intertwined, so that cross-linking will occur mainly in each latex particles, resulting in low film strength Occurrence of brittle damage. In order to improve the diffusion rate of macromolecules, it is necessary to reduce the MFT and join the film forming agent. This is a traditional method.
However, the addition of film-forming auxiliaries increases the VOC content of the coating and also adversely affects the physical and mechanical properties of the paint film. Therefore, it is desirable to develop a crosslinking agent that reduces the minimum film forming temperature and has a suitable crosslinking speed, resulting in excellent film performance with low or no formaldehyde content and environmentally friendly requirements.
The novel resin synthesis method is mainly a method of introducing a vinyl pendant group on the main chain of a carboxyl group-containing polymer by reacting a carboxyl group on the main chain with an aziridinyl group, an epoxy group, a carbodiimide group methacrylic acid Ester reaction, the unsaturated double bond into the main chain.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The polycarbodiimide crosslinker was developed in the 1980s. The purpose of the development of the polycarbodiimide crosslinker is to have the lower crosslinking properties of aziridine and lower toxicity. The polycarbodiimide cross-linking agent is characterized by rapid crosslinking with carboxyl-containing resins (crosslinkable at 30 ° C at 30 ° C), while the reaction rate with water is rather slow. The resulting film has good water resistance and solvent resistance, and can improve the corrosion resistance of the coating.
There are two main factors that affect the mechanism of film crosslinking, one is the diffusion rate of polymer macromolecules, and the other is the crosslinking speed of macromolecules.
If the cross-linking speed is too fast, macromolecules will be too late to spread, can not pass through the latex particles between the intermolecular intertwined, so that cross-linking will occur mainly in each latex particles, resulting in low film strength Occurrence of brittle damage. In order to improve the diffusion rate of macromolecules, it is necessary to reduce the MFT and join the film forming agent. This is a traditional method.
However, the addition of film-forming auxiliaries increases the VOC content of the coating and also adversely affects the physical and mechanical properties of the paint film. Therefore, it is desirable to develop a crosslinking agent that reduces the minimum film forming temperature and has a suitable crosslinking speed, resulting in excellent film performance with low or no formaldehyde content and environmentally friendly requirements.
The novel resin synthesis method is mainly a method of introducing a vinyl pendant group on the main chain of a carboxyl group-containing polymer by reacting a carboxyl group on the main chain with an aziridinyl group, an epoxy group, a carbodiimide group methacrylic acid Ester reaction, the unsaturated double bond into the main chain.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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