1, Strong anti-mold, economical and universal, high temperature and UV resistant.
2, PH value applicable range: 2-10, with excellent stability, no yellowing.
3, No heavy metals, no formaldehyde and formaldehyde donor, good safety.
4, Small particle size, uniform dispersion, good compatibility with various coatings and emulsions.
Chemical bonding theory
The theory believes that this type of compound group X (such as alkoxy) can chemically react with MOH (M=Si, Al, Fe, etc.) on the surface of glass, metal, silicate, etc. to form a chemical bond; Y group It can react with resin to form chemical bonds. Such two materials with very different properties are “coupled” by chemical bonds, and a good bond is obtained. This is the reason why this type of compound is called a coupling agent.
For example, silane WD-50 (KH-550) is used in composite materials composed of montan wax structure epoxy resin and glass cloth, and the effect of organochlorosilane on the strength of glass fiber reinforced polyester laminates. The experimental results are shown in Table 16-6. The strength of Ester FRP can be considered that CH: -CH- or CHA-CHCH z-participates in the curing reaction of the polyester resin; while CH, C Hz-or CHACHzCHz-can not participate in the reaction, so the enhancement effect is not as good as the former.
Physical adsorption theory
When discussing the gravitational force between objects, Newton pointed out that the parts of all uniform hard objects that are completely in contact with another object will stick together very firmly. Zisman once concluded: In the manufacture of composite materials, the good wetting of the adherend by the liquid resin is of paramount importance. If complete infiltration can be obtained, the physical adsorption of the resin to the high-energy surface will provide a bonding strength much higher than the cohesive strength of the organic resin. The theory believes that whether the surface of a solid can be wetted by a liquid depends on the relationship between the surface energies of the two. When the surface energy of the solid is greater than the wetting energy of the liquid, the solid can be wetted by the liquid. The function of the coupling agent is to improve the wetting ability between the resin and the glass, and make the interface of the composite material get a good adhesion.
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