Stock code：300019
Application and method of silane coupling agent
Release time：
2020-09-03
来源：
en.gbxfsilicones.com
作者：
silane coupling agent
Application and method of silane coupling agent
1. Appearance pretreatment
The silane coupling agent was prepared into 0. 5-1% concentration of dilute solution, when using, just apply a thin layer on the clean surface to be glued, and then apply glue after being dry. Most of the solvents used are water, alcohol (methoxysilane chooses methanol, ethoxysilane chooses ethanol), or mixture of water and alcohol, and water free water, cheap and non-toxic ethanol and isopropanol are suitable. Except for aminoalkyl silane, the solution prepared by other silane coupling agents should be added with acetic acid as hydrolysis catalyst, and the pH value should be adjusted to 3. 5～5。 5。 Because of the poor stability of long chain alkyl and phenylsilane, it is not suitable to prepare aqueous solution. Due to the hydrolysis of silane, it can not be stored for a long time. It is better to prepare and use it now, and it is better to use it within one hour.
2. Direct increase
The silane coupling agent is directly added into the adhesive component, and the amount of silane coupling agent is 1-5% of that of the matrix resin. After coating, the coupling agent molecules migrate to the bonding interface by the diffusion of molecules. As for the adhesive that needs to be cured, it needs to be placed for a period of time after the adhesive is coated, so that the coupling agent can complete the migration process, so that the better effect can be achieved. In practical use, the coupling agent often forms a stacking layer on the surface, but only the single molecular layer works. Therefore, the amount of coupling agent need not be too much.
Specific usage of silane coupling agent
1. Pretreatment filling method
The filler is put into the solid mixer (henshel or V-type solid mixer, etc.) and the silane solution is directly sprayed on the filler and mixed. The higher the rotating speed is, the better the dispersion effect is. Generally, the mixing time is 10-30 minutes (the slower the speed, the longer the time). The filler should be dried at 120 ℃ for 2 hours after treatment.
2. Silane coupling agent aqueous solution
(glass fiber surface treatment agent): glass fiber surface treatment agent often 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 surface treatment agent for glass fiber. The pH value of 5 times aqueous solution is adjusted to a certain value with organic acid or salt. Under sufficient mixing, silane is added until it is clear, and then other components are involved. Isopropanol can be used to help dissolve insoluble silane. In the process of drawing, the surface treatment agent of glass fiber is sprayed on the glass fiber, and the solvent and water can be removed.
3. Bottom surface method
5% - 20% silane coupling agent solution is the same as the above, through coating, brushing, spraying, dipping the surface of the substrate, take out the room temperature to dry for 24 hours, preferably at 120 ℃ for 15 minutes.
4. Direct participation method
Silane can also directly participate in the filler / resin mixture, and when the resin and filler are mixed, silane can be directly sprayed into the mixture. Generally, the amount of coupling agent is 0. 1% - 2% (according to the packing diameter). Then the resin / filler added with silane is molded (extrusion, compression molding, coating, etc.).
Author: coupling agent source: en.gbxfsilicones.com
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