News Details
Epoxy resin coating crosslinker crosslinked three stages
2017-3-16 16:49:16
Epoxy resin coating crosslinker crosslinked three stages,Liquid - operating time
Operating time (and hours of work or life) is a part of the crosslinking time, after mixing, resin/crosslinking agent mixture is still a fluid and can work and suitable for application. In order to ensure reliable adhesive, all construction and positioning work should in the crosslinking operating time well.
- into crosslinked gel
Mixture into crosslinked phase (also called ripening stage), then it started to gel or "mutation". At this time of the epoxy didn't work for a long period of time will, will also lose the sticky. At this stage to any interference. It will be hard rubber soft gel content, you use the thumb will have to move it.
When the mixture is only partial crosslinking, the new use of epoxy resin can still chemical link with it, so the untreated surface can still bonding or reaction. However, close to a mixture of crosslinking in decreasing the ability.
Solid - crosslinking in the end
Epoxy mixture to crosslinking becomes solid phase when the sanding and integer. His thumb at this time you have fixed it, about 90% of the final when epoxy resin reaction intensity, thus removing the clamp, it continues to put it in room temperature to maintain several angel crosslinking.
When new using epoxy resin can not chemical link with it, because the surface of epoxy must appropriately pretreatment such as polishing, to get good adhesive mechanical strength.
Epoxy resin with epoxy groups and hydroxyl zhong, para hydroxy can react with isocyanate. Epoxy resin as polyols containing hydroxyl component directly join polyurethane adhesives, use this method only hydroxyl groups take part in the reaction, epoxy group failed to respond.
With acid resin, carboxyl, epoxy ring opening, then react with the isocyanate polyurethane adhesives. Epoxy resin can be dissolved in ethyl acetate, adding phosphate heating reaction, the adduct of added to the polyurethane adhesives; Early sticky glue; Heat resistant and hydrolytic stability can improve reaction can also be used alcohol amine or amine to produce the polyol, uncle of nitrogen atoms in the adduct exist, can accelerate the NCO reaction.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Using epoxy resin as many hydroxyl component combines the advantages of polyurethane and the epoxy resin has good bonding strength and chemical resistance, make use of commonly used epoxy resin polyurethane adhesives, EP EP - 12-13, EP - 16 and EP - 20 varieties.
Epoxy resin and epoxy resin adhesive is non-toxic, but due to the solvent is added in the preparation process and other toxic substances, so many "toxic" epoxy resin, domestic epoxy resin industry is through the modification and avoid to add water, keep the epoxy resin "toxic" true colors. Epoxy resin and additives commonly used at the same time, in order to obtain application value.
Epoxy resin, containing epoxy group in the polymer collectively, mainly is suitable for the corrosive medium is not too strong, also ability general acid alkali resistance performance is more prominent (except hydrofluoric acid corrosion, anti-corrosion market abroad to dosage of epoxy resin has been greatly reduced, the main reason lies in the corrosion resistant resin in unsaturated polyester resin has been developing rapidly, and the variety is more, the domestic market started relatively late due to the unsaturated polyester resin, so the epoxy resin is still one of the main varieties of resin in the field of anti-corrosion.
The main characteristics of epoxy resin is high bond strength, large brittleness, low shrinkage rate, products price is higher, crosslinked resin at normal temperature in temperature does not exceed 80 ℃.
Crosslinking agent of epoxy resin with amine or acid anhydride, resin compound varieties, etc. And the amine compounds are the most commonly used, it can be divided into fatty amines, aromatic amine and modified amine and other categories.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Operating time (and hours of work or life) is a part of the crosslinking time, after mixing, resin/crosslinking agent mixture is still a fluid and can work and suitable for application. In order to ensure reliable adhesive, all construction and positioning work should in the crosslinking operating time well.
- into crosslinked gel
Mixture into crosslinked phase (also called ripening stage), then it started to gel or "mutation". At this time of the epoxy didn't work for a long period of time will, will also lose the sticky. At this stage to any interference. It will be hard rubber soft gel content, you use the thumb will have to move it.
When the mixture is only partial crosslinking, the new use of epoxy resin can still chemical link with it, so the untreated surface can still bonding or reaction. However, close to a mixture of crosslinking in decreasing the ability.
Solid - crosslinking in the end
Epoxy mixture to crosslinking becomes solid phase when the sanding and integer. His thumb at this time you have fixed it, about 90% of the final when epoxy resin reaction intensity, thus removing the clamp, it continues to put it in room temperature to maintain several angel crosslinking.
When new using epoxy resin can not chemical link with it, because the surface of epoxy must appropriately pretreatment such as polishing, to get good adhesive mechanical strength.
Epoxy resin with epoxy groups and hydroxyl zhong, para hydroxy can react with isocyanate. Epoxy resin as polyols containing hydroxyl component directly join polyurethane adhesives, use this method only hydroxyl groups take part in the reaction, epoxy group failed to respond.
With acid resin, carboxyl, epoxy ring opening, then react with the isocyanate polyurethane adhesives. Epoxy resin can be dissolved in ethyl acetate, adding phosphate heating reaction, the adduct of added to the polyurethane adhesives; Early sticky glue; Heat resistant and hydrolytic stability can improve reaction can also be used alcohol amine or amine to produce the polyol, uncle of nitrogen atoms in the adduct exist, can accelerate the NCO reaction.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
Using epoxy resin as many hydroxyl component combines the advantages of polyurethane and the epoxy resin has good bonding strength and chemical resistance, make use of commonly used epoxy resin polyurethane adhesives, EP EP - 12-13, EP - 16 and EP - 20 varieties.
Epoxy resin and epoxy resin adhesive is non-toxic, but due to the solvent is added in the preparation process and other toxic substances, so many "toxic" epoxy resin, domestic epoxy resin industry is through the modification and avoid to add water, keep the epoxy resin "toxic" true colors. Epoxy resin and additives commonly used at the same time, in order to obtain application value.
Epoxy resin, containing epoxy group in the polymer collectively, mainly is suitable for the corrosive medium is not too strong, also ability general acid alkali resistance performance is more prominent (except hydrofluoric acid corrosion, anti-corrosion market abroad to dosage of epoxy resin has been greatly reduced, the main reason lies in the corrosion resistant resin in unsaturated polyester resin has been developing rapidly, and the variety is more, the domestic market started relatively late due to the unsaturated polyester resin, so the epoxy resin is still one of the main varieties of resin in the field of anti-corrosion.
The main characteristics of epoxy resin is high bond strength, large brittleness, low shrinkage rate, products price is higher, crosslinked resin at normal temperature in temperature does not exceed 80 ℃.
Crosslinking agent of epoxy resin with amine or acid anhydride, resin compound varieties, etc. And the amine compounds are the most commonly used, it can be divided into fatty amines, aromatic amine and modified amine and other categories.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian