Silane coupling agent migration method

The silane coupling agent directly added to the adhesive composition, as the matrix resin for the amount of general amount of 1 ~ 5%.After the glue by molecular diffusion effect, coupling agent molecular migration to the bonding interface coupling effect.For curing adhesives, glue should be placed after a period of time for curing, so that the coupling agent to complete the migration process, in order to obtain good results.Actual use, often coupling agent on the surface to form a sediment, but the real work is monomolecular layer, therefore, the dosage of coupling agent need not too much.The method using silane coupling agent surface pretreatment method and direct addition method, the former is diluted with coupling agent treatment filler surface, which is a premixed resin and filler, adding coupling agent of concentrate.Silane coupling agent into the solution, is advantageous to the silane coupling agent on the surface of the material, dispersion, solvent is a mixture of water and alcohol solution, the solution is commonly silane (20%), alcohol (72%), water (8%), alcohol is commonly ethanol (to ethoxy silane) methanol (methoxy silane) and isopropanol (to not easily soluble in ethanol, methanol silane) by silane hydrolysis velocity is related to PH value, the slowest neutral, acid, alkali is faster, so generally need to adjust the PH value of solution, in addition to the amino silane, other silane can add a small amount of acetic acid, adjusting the PH to 4, 5, amino silane for alkaline, don't have to be adjusted.Because of silane hydrolysis, not far, had better match current now, best finished in an hour.

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Silane coupling agent is commonly used classification and naming

Naming principles of silane coupling agent silane (silane) is often used to as a principal name, linking substituent on silicon or the name of the functional groups, and according to the provisions of the order note the substituent position or carbon functional groups, so as to get the name of the chemical formula of the silane coupling agent.In daily production and business operation process, the silane coupling agent to brand name often found in a variety of occasions.Due to historical reasons, the silane industry still has a different system of brand name products.Foreign brand dow corning (Z series), Wallace figure (A series), the letter (the KBW series), evonik degussa (AMEO, GLYMO series) and so on all have their respective brand system, domestic brands have A wu3 da4 organic silicon series (WD), jianghan elaboration (JH series), nanjing dawn (SG series, NDZ series), and other manufacturers.
There are many types of coupling agent and silane coupling agent, titanate coupling agent and aluminum acid ester coupling agent and double metal coupling agent, phosphate ester coupling agent, boric acid ester coupling agent and chromium complex and other senior fatty acid, alcohol, ester coupling agent and so on, is currently the most widely application scope silane coupling agent and titanate coupling agent, the most commonly used in rubber industry is silane and titanate and aluminate ester coupling agent.Silane coupling agent were the earliest people to study and application as early as coupling agent.

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Silane coupling agent application methods

Main surface pretreatment method and direct addition method, the former with dilution of coupling agent filler surface processing, the latter in premixed resin and filler, adding coupling agent concentrate.Silane coupling agent into the solution, for silane coupling agent on the surface of the material, dispersion, solvent is a mixture of water and alcohol solution, for silane (20%), alcohol (72%), water (8%), alcohol is ethanol (to ethoxy silane), methanol (methoxy silane) and isopropanol (to not easily soluble in ethanol, methanol silane);By silane hydrolysis velocity is related to PH value, the slowest neutral, acid, alkali is faster, so need to adjust the PH of the solution, in addition to the amino silane, other silane to join a small amount of acetic acid, 4-5 adjust PH value, amino silane for alkaline, silane crosslinking is introduced through silane coupling agent in polyethylene, increase the intensity of the polyethylene, aging resistance and other properties.

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Curing agent and silane coupling agent on the properties of organic silicone coating

By controlling the organic silicone coating formula of the content of curing agent and silane coupling agent, study their elastic modulus, hardness of coating materials, hydrophobicity, and the effect of water absorption and water immersion resistant performance.Results show that after the curing agent content is more than 4%, with the increase of content of curing agent, coating the elastic modulus decreased, shaw hardness increases, bibulous rate is increasing;The increase of the content of silane coupling agent, elastic modulus and the absorption of the organic silicone coating increase, but shaw hardness and water contact Angle decreased.When adding 6% curing agent coating the elastic modulus of water is the most sensitive.Containing 5% curing agent and 8% content of silane coupling agent of organic silicone coating significantly lower stability in the water.Amount of curing agent added can lead to high silica chain  crosslinking degree increase, dense mesh structure change, increase the coating hardness, go against the antifouling performance of the coating;Excessive amount of silane coupling agent is added will lead to coating on the surface of the hydrophilic group increased, the water contact Angle decreased, Marine bacteria increase.

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Glass substrate adhesion promoter to discuss

Glass substrate is a kind of hydrophilic inorganic substrate.In the general case, the glass is easy to combine with moisture in the air.Even in the dry room can also be seen under a microscope on the glass surface with a thin layer of water spray layer.In wet weather, could be seen with the naked eye.Therefore the paint in the humidity environment construction, the glass substrate is not firm, because there is a layer of water blocking paint group, grasped the glass, even in the long time can capture the glass will be off the paint.So the best way to attach is can penetrate fog layer, with groups hold glass, known as the hydrophilic, and wrapped with paint itself adhesion (hydrophilic).
At present is proved with epoxy and amino adhesion promoter can do more than two points.And, of course, many with both epoxy group and amino group and other groups, such as ether bond, etc.) or more groups of coupling agent.Above the adhesion promoter can increase the adhesion to glass well.If the customer requirements more stringent adhesion, can be sprayed on the glass substrate or concentration of one for more than 5% with groups of adhesion promoter and then add 1-2% of total amount of additives to paint adhesion.

(source:http://www.ac-chem.net/news/adhesion-promoter-83-a740.html)