News Details
Use crosslinking agent for polyurethane coating
2017-6-16 11:58:50
Use crosslinking agent for polyurethane coating
Polyurethane containing strong polarity isocyanate (NCO), - OH and affections, and pu molecules can form hydrogen bonds, van der Waals force exists between force and high cohesion, of the polarity of plastic surface has the very good stick relay. For nonpolar plastic (such as PE, PP), in addition to dealing with the surface of the plastic, can also be used on the polyurethane resin grafted with similar to these nonpolar resin chemical properties, surface tension and solubility parameters of chain segments.
According to the appearance of water-based polyurethane, it is divided into polyurethane aqueous solution, polyurethane moisture content and polyurethane emulsion. The most practical application is polyurethane emulsion and dispersant, commonly referred to as water-based polyurethane or polyurethane emulsion.
According to the composition, there is a single, two-component part, the single component is thermoplastic resin, and the polymer is not cross-linked in the process of film forming, so it is easy to construct. Two-component waterborne polyurethane coatings by containing active - NCO curing agent components and active hydrogen containing can react with - NCO (hydroxyl) of water-based polyols, before construction mix both homogeneous and crosslinking reaction in the process of film forming, coating performance is good.
Single component waterborne polyurethane coatings is one of the most common in waterborne polyurethane coatings, which is the most commonly used, high elongation at break (800%), the appropriate intensity (20 mpa) and the advantages of room temperature dry. Traditionally, one-component water-based polyurethane coatings generally have low relative molecular weight or low crosslinking.
In order to further improve the mechanical performance of single component waterborne polyurethane coatings and chemical resistance, and can be crosslinked by introducing reactive groups or the use of compound modification methods to improve the coating performance, choose such as polyols and isocyanates multifunctional and multiple amine compounds synthesis of waterborne polyurethane dispersions with crosslinking structure.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
The addition of internal crosslinking agents, such as carbonized diamines, methylamine and nitrogen heterocyclic compounds; Heat activation crosslinking and self-oxidation crosslinking are used. Epoxy resin and epoxy resin composite higher branching degree is introduced into the main chain of the polyurethane, emulsion coating adhesion can be improved, the drying rate, film hardness and water resistance.
Two-component water-based polyurethane coating. In the early 1990 s, Jacobs successfully developed can disperse in water, such as isocyanate curing agents, thus make the two-component waterborne polyurethane coatings entered the stage of practical research, it has low film-forming temperature, good adhesion, abrasion resistance, high hardness, and chemical resistance, good weatherability and superior performance.
In order to obtain the practical coating of the surface and inner quality, the two-component polyurethane moisture content should be satisfied:
(1) polyol system should have emulsifying ability, thus ensuring the mixture of two components easy to polyurethane curing agent (especially without hydrophilic modification of curing agent) emulsification, dispersion function, make the dispersion particle size as small as possible, in order to better mixing diffusion in water;
(2) the curing agent of viscosity should be as small as possible, thus reducing the amount of organic solvent, even without organic solvent, and at the same time can guarantee containing hydroxyl component mix well. As applied to car inner decoration painting, in the light of the single component waterborne polyurethane better adhesion, can be used in the single component waterborne polyurethane primer and coating, two-component waterborne polyurethane paint and the paint coat.
Al to twelve fluorine heptyl methacrylate and acrylic acid ester as monomer, emulsion polymerization was prepared by polyurethane - multivariate composite fluorinated polyacrylate emulsion, the emulsion has a unique hydrophobic and oleophobic property fouling resistance. According to the literature synthesis process and formula made with similar emulsion, high surface hardness of the coating, the surface tension is low, the emulsion brush natural dry film on the wall, the graffiti can be easily erased, anti graffiti effect is better.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Polyurethane containing strong polarity isocyanate (NCO), - OH and affections, and pu molecules can form hydrogen bonds, van der Waals force exists between force and high cohesion, of the polarity of plastic surface has the very good stick relay. For nonpolar plastic (such as PE, PP), in addition to dealing with the surface of the plastic, can also be used on the polyurethane resin grafted with similar to these nonpolar resin chemical properties, surface tension and solubility parameters of chain segments.
According to the appearance of water-based polyurethane, it is divided into polyurethane aqueous solution, polyurethane moisture content and polyurethane emulsion. The most practical application is polyurethane emulsion and dispersant, commonly referred to as water-based polyurethane or polyurethane emulsion.
According to the composition, there is a single, two-component part, the single component is thermoplastic resin, and the polymer is not cross-linked in the process of film forming, so it is easy to construct. Two-component waterborne polyurethane coatings by containing active - NCO curing agent components and active hydrogen containing can react with - NCO (hydroxyl) of water-based polyols, before construction mix both homogeneous and crosslinking reaction in the process of film forming, coating performance is good.
Single component waterborne polyurethane coatings is one of the most common in waterborne polyurethane coatings, which is the most commonly used, high elongation at break (800%), the appropriate intensity (20 mpa) and the advantages of room temperature dry. Traditionally, one-component water-based polyurethane coatings generally have low relative molecular weight or low crosslinking.
In order to further improve the mechanical performance of single component waterborne polyurethane coatings and chemical resistance, and can be crosslinked by introducing reactive groups or the use of compound modification methods to improve the coating performance, choose such as polyols and isocyanates multifunctional and multiple amine compounds synthesis of waterborne polyurethane dispersions with crosslinking structure.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
The addition of internal crosslinking agents, such as carbonized diamines, methylamine and nitrogen heterocyclic compounds; Heat activation crosslinking and self-oxidation crosslinking are used. Epoxy resin and epoxy resin composite higher branching degree is introduced into the main chain of the polyurethane, emulsion coating adhesion can be improved, the drying rate, film hardness and water resistance.
Two-component water-based polyurethane coating. In the early 1990 s, Jacobs successfully developed can disperse in water, such as isocyanate curing agents, thus make the two-component waterborne polyurethane coatings entered the stage of practical research, it has low film-forming temperature, good adhesion, abrasion resistance, high hardness, and chemical resistance, good weatherability and superior performance.
In order to obtain the practical coating of the surface and inner quality, the two-component polyurethane moisture content should be satisfied:
(1) polyol system should have emulsifying ability, thus ensuring the mixture of two components easy to polyurethane curing agent (especially without hydrophilic modification of curing agent) emulsification, dispersion function, make the dispersion particle size as small as possible, in order to better mixing diffusion in water;
(2) the curing agent of viscosity should be as small as possible, thus reducing the amount of organic solvent, even without organic solvent, and at the same time can guarantee containing hydroxyl component mix well. As applied to car inner decoration painting, in the light of the single component waterborne polyurethane better adhesion, can be used in the single component waterborne polyurethane primer and coating, two-component waterborne polyurethane paint and the paint coat.
Al to twelve fluorine heptyl methacrylate and acrylic acid ester as monomer, emulsion polymerization was prepared by polyurethane - multivariate composite fluorinated polyacrylate emulsion, the emulsion has a unique hydrophobic and oleophobic property fouling resistance. According to the literature synthesis process and formula made with similar emulsion, high surface hardness of the coating, the surface tension is low, the emulsion brush natural dry film on the wall, the graffiti can be easily erased, anti graffiti effect is better.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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