1. In the bonding of metal and non-metal in structural adhesives, if silane adhesives are used, they can be condensed with metal oxides, or with another silanol, so that the silicon atoms are in close contact with the surface of the glued object. For example, adding silane into butane-phenolic structural adhesive as viscosifier can significantly improve the bonding strength.

2. Silane has been widely used as a treatment agent in gluing glass fiber at home and abroad. It can react chemically with the interface to improve the bonding strength. For example, the bonding peel strength of neoprene adhesive is 1.07 kg/cm 2 when silane is not used as the treatment agent, and 8.7 kg/cm 2 when amino silane is used.

3. In the bonding of rubber and other materials, silane viscosifier has special function. It obviously improves the bonding strength of all kinds of rubber and other materials. For example, when glass is bonded to polyurethane rubber, the peel strength of the adhesive is 0.224 kg/cm 2 without silane, and 7.26 kg/cm 2 with silane.

4. Bonding problems that cannot be solved by ordinary adhesives can sometimes be solved by silane coupling agents. Such as aluminum and polyethylene, silicone rubber and metal, silicone rubber and plexiglass, according to the chemical bond theory, choose the corresponding silane coupling agent, get a satisfactory solution. For example, vinyl triperoxide tert-butylsilane (Y 4310) can make polyethylene and aluminum foil bonding; With butadienyl triethoxysilane, the separation strength of silicone rubber from metal can reach 21.6 ~ 22.4 kg/cm 2. General adhesive or resin with the use of coupling agent can not only improve the bonding strength, but also increase the water resistance and durability of the adhesive force. For example, polyurethane and epoxy resin have high adhesive force for many materials, but their durability and water resistance are not ideal. After adding silane coupling agent, the performance of this aspect can be significantly improved.

Other applications of silane coupling agents include:

(1) adhere the immobilized enzyme to the surface of the glass substrate, (2) sand control in oil well drilling,

(3) the brick surface has hydrophobicity, (4) through the anti-hygroscopic effect, so that the fluorescent lamp coating has a high surface resistance; ⑤ To improve the hygroscopic performance of organic relative glass surface in liquid chromatographic column.

1. Pretreatment method

The silane coupling agent is prepared into dilute solution of 0.5 ~ 1% concentration. When used, only a thin layer is applied on the clean adhesive surface, and glue can be applied after drying. The solvent used is mostly water, alcohol (methoxysilane choose methanol, ethoxysilane choose ethanol), or mixture of water and alcohol, and does not contain fluoride ion water and inexpensive non-toxic ethanol, isopropyl alcohol is appropriate. Except for aminoalkyl silane, the solution prepared by other silane coupling agents should be added acetic acid as hydrolysis catalyst, and the pH value should be adjusted to 3.5 ~ 5.5. Long chain alkyl and phenyl silane are not suitable for aqueous solution because of their poor stability. The hydrolysis process of chlorosilane and ethoxylsilane is accompanied by serious condensation reaction, so it is not suitable to be used as aqueous solution or water alcohol solution, but mostly as alcohol solution. Poor water-soluble silane coupling agent, can first add 0.1 ~ 0.2%(mass fraction) of non-ionic surfactants, and then add water processing into water emulsion use.

2. The migration method

The silane coupling agent is directly added to the adhesive component, generally adding 1 ~ 5% of the amount of matrix resin. After gluing, the coupling agent molecules migrate to the bonding interface by molecular diffusion. For adhesives that need to be cured, after gluing, they need to be placed for a period of time before curing, so that the coupling agent can complete the migration process, in order to obtain better results.

In practice, the coupling agent often forms a deposition layer on the surface, but the real effect is only the monolayer, so the amount of coupling agent need not be too much.

Silane coupling agent is mainly used in surface pretreatment method and direct addition method, the former is to dilute the coupling agent to treat the surface of the filler, the latter is in the resin and filler premix, adding the coupling agent of the original solution.

The silane coupling agent is prepared into a solution, which is conducive to the dispersion of the silane coupling agent on the surface of the material. The solvent is a solution prepared by water and alcohol. The solution is generally 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, neutral slow, partial 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, because of its alkalinity, need not be regulated. Because silane hydrolyzed, can not last long, now with now, in an hour to run out.

1. Deal with the stuffing

Put the filler into a solid mixer (high-speed solid mixer HENSHEL or V-type solid mixer, etc.), and spray the silane solution directly on the filler and stir, the higher the speed, the better the dispersion effect. Generally stirring in 10-30 minutes (the slower the speed, the longer the time), the stuffing should be dried at 120 degrees Celsius after treatment (2 hours).

2. Solution (glass fiber surface treatment agent)

Glass fiber surface treatment agent usually contains: film forming agent, antistatic agent, surface active agent, coupling agent, water. The amount of coupling agent is generally 0.3%-2% of the total amount of glass fiber surface treatment agent. First, adjust PH value of 5 times aqueous solution to a certain value with organic acid or salt, and then add silane until it is transparent under full stirring, and then add other components. For silane that is difficult to dissolve, isopropyl alcohol can be used to help dissolve. In the process of drawing, spray the glass fiber surface treatment agent on the glass fiber to dry, remove the solvent and water.

3. The bottom method

The solution of 5%-20% silane coupling agent with the above mentioned, through coating, brush, spray, impregnation treatment of the substrate surface, out of room temperature to dry for 24 hours, bake at 120℃ for 15 minutes.

4. Jump in

Silane can also be directly added to the filler/resin mixture. When the resin and filler are mixed, silane can be directly sprayed into the mixture. The amount of coupling agent is generally 0.1% - 2% of the amount of filler (according to the diameter size of the filler). The silane resin/filler is then molded (extruded, pressed, coated, etc.).