News Details
Organic functional silane crosslinked coating agent
2017-4-6 11:16:40
Organic functional silane crosslinked coating agent,Usually silane additive as monomer used in the paint, that is to say, these additives is carried out in accordance with the formula described in the section on preparation.
However, monomer silane also has some limitations. The silane processing in solvent formula is very complex, more complex in water-based formulations, this is because the hydrolysis and condensation reaction of silane easily happened. Organic functional silane used is the key to dual nature of the silane molecules.
Organic functional group at one end of the standard coupling reaction, however, three alkoxy hydrolysis and condensation reaction. The two reaction process can be controlled through different reaction rate, and will affect the overall performance of the additives.
So, monomer silane and may lead to coating curing speed slower, film forming time, especially at room temperature environment. In monomer silane grafted per unit or coupling is only one organic functional groups, it will be more prominent. The dependence of siloxane crosslinking stronger, to effectively transfer need physical characteristics, organic reactions at this time is just a part of the crosslinking reaction steps.
Usually monomer silane volatile organic compounds (VOC) in its molecular weight percentage is very high. For example, gamma ammonia propyl triethoxy silane release of its weight of 62.5% ethanol, gamma glycidyl ether base silicon propyl three oxygen radicals release accounted for 40.7% of its weight of methanol. This two kinds of silane generated VOC accounts for 0.1 15% of the proportion of the total.
New environmental regulations to further limit the allows the VOC content in the coating formula, each component of VOC accounted for the proportion of the total amount of VOC in the final formula should carefully review.
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
In the ideal case, the first use of silane hydrolyzate was carried out on the surface pretreatment, ordered in the high temperature air drying or curing surface again. For particulate matter, sheet, powdery material and so on, these substances can be formed directly dissolved in silane hydrolyzate pulp or paste (see materials and methods section) or directly to the silane hydrolyzate spraying layer formed in the material surface treatment. However, in the case of unable to realize preprocessing, join in the process of the preparation of the final coating silane can be.
Develop a product to break through the above limitations, design and synthesis of a silane oligomer. Low poly structure can solve some problems of the silane reaction, because before the formula or curing to form a network of small siloxane, such coupling between polymer and organic functional groups become the main reaction of compounds.
Because the original is organic functional groups in the reaction occurs crosslinking, and silanol condensation reaction in accordance with the time. In addition, this kind of oligomeric silane per unit contains a large number of organic functional groups, so as to greatly improve the efficiency of the crosslinking reaction.
Because in front of the preparation and curing use SiOSi and SiOH keys instead of SiOR, so the VOC and HAP also reduce a lot. Oligomer design enables the oligomeric silane in water, solvent, and solvent-free system use. So this product does not contain solvent composition. Another typical advantage of solvent-free structure is high flash point, fewer problems when loading and unloading and storage, more suitable for industrial application.
Silane oligomer is a kind of low molecular weight polymer, is by silane hydrolysis silanol - key silanol condensation polymerization the two consecutive reaction (see figure 2). Silane monomer in the process of synthesis of the oligomer the fundamental problem is how to react to the two under effective control so that the silane oligomer molecular weight can be controlled.
Solution to this problem has a lot of, controlled hydrolysis and condensation reaction can be used in the preparation of low polysiloxane products. Epoxy base material is very common in the coating industry.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
However, monomer silane also has some limitations. The silane processing in solvent formula is very complex, more complex in water-based formulations, this is because the hydrolysis and condensation reaction of silane easily happened. Organic functional silane used is the key to dual nature of the silane molecules.
Organic functional group at one end of the standard coupling reaction, however, three alkoxy hydrolysis and condensation reaction. The two reaction process can be controlled through different reaction rate, and will affect the overall performance of the additives.
So, monomer silane and may lead to coating curing speed slower, film forming time, especially at room temperature environment. In monomer silane grafted per unit or coupling is only one organic functional groups, it will be more prominent. The dependence of siloxane crosslinking stronger, to effectively transfer need physical characteristics, organic reactions at this time is just a part of the crosslinking reaction steps.
Usually monomer silane volatile organic compounds (VOC) in its molecular weight percentage is very high. For example, gamma ammonia propyl triethoxy silane release of its weight of 62.5% ethanol, gamma glycidyl ether base silicon propyl three oxygen radicals release accounted for 40.7% of its weight of methanol. This two kinds of silane generated VOC accounts for 0.1 15% of the proportion of the total.
New environmental regulations to further limit the allows the VOC content in the coating formula, each component of VOC accounted for the proportion of the total amount of VOC in the final formula should carefully review.
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
In the ideal case, the first use of silane hydrolyzate was carried out on the surface pretreatment, ordered in the high temperature air drying or curing surface again. For particulate matter, sheet, powdery material and so on, these substances can be formed directly dissolved in silane hydrolyzate pulp or paste (see materials and methods section) or directly to the silane hydrolyzate spraying layer formed in the material surface treatment. However, in the case of unable to realize preprocessing, join in the process of the preparation of the final coating silane can be.
Develop a product to break through the above limitations, design and synthesis of a silane oligomer. Low poly structure can solve some problems of the silane reaction, because before the formula or curing to form a network of small siloxane, such coupling between polymer and organic functional groups become the main reaction of compounds.
Because the original is organic functional groups in the reaction occurs crosslinking, and silanol condensation reaction in accordance with the time. In addition, this kind of oligomeric silane per unit contains a large number of organic functional groups, so as to greatly improve the efficiency of the crosslinking reaction.
Because in front of the preparation and curing use SiOSi and SiOH keys instead of SiOR, so the VOC and HAP also reduce a lot. Oligomer design enables the oligomeric silane in water, solvent, and solvent-free system use. So this product does not contain solvent composition. Another typical advantage of solvent-free structure is high flash point, fewer problems when loading and unloading and storage, more suitable for industrial application.
Silane oligomer is a kind of low molecular weight polymer, is by silane hydrolysis silanol - key silanol condensation polymerization the two consecutive reaction (see figure 2). Silane monomer in the process of synthesis of the oligomer the fundamental problem is how to react to the two under effective control so that the silane oligomer molecular weight can be controlled.
Solution to this problem has a lot of, controlled hydrolysis and condensation reaction can be used in the preparation of low polysiloxane products. Epoxy base material is very common in the coating industry.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian