Application of silane coupling agent in coatings industry-Iota

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Service > Application of silane coupling agent in coatings industry

Application of silane coupling agent in coatings industry

Silane coupling agent the earliest is in the 40s of 20th century by the Union Carbide Corporation and Dow Corning company developed first, initially regarded it as a glass fiber surface treatment agent and can be used in glass fiber reinforced plastics. Subsequently, due to the unique properties of the silane coupling agent and the remarkable modification effect, and the new product continuously come out, make its application field expand. Then in rubber, plastics, filled composite material, epoxy packaging materials, elastomers, paints, coatings, adhesives and sealants, and was widely used.
One of the main application fields of silane coupling agent is the inorganic filler used in the treatment of organic polymer.. The latter by silane coupling agent treatment, can be the hydrophilic surface, changing the surface organic married can avoid system aggregation of particles and polymer sharply thickening, also can improve the organic polymer to fill the wettability of filler, through carbon functional silane can also make fill filler and polymer can be firmly bonded.
Silane coupling agent used mainly surface pre treatment method and the direct addition method. The former is the dilution of silane coupling agent on the surface of the packing material, which is when the premixed resin and filler, adding coupling agent solution.
Silicone
(of silicone elastomer particle / Dao Kangning for skin care cream)
Are the slowest and ethanol is generally formulated as dispersion of silane coupling agent solution, in favor of silane coupling agent in the material surface, the solvent is water and alcohol solution, general solution for silane (20%), alcohol (72%), water (8%), alcohol (of ethoxy silane), methanol (the methoxy silane) and isopropanol (of not easily soluble in ethanol, methanol silane); because of silane hydrolysis rate and pH value relevant, neutral, partial acid, alkaline faster, so the general need to adjust the solution pH value, with the exception of amino silane, other silane can be added a small amount of acetic acid, regulating pH to 4-5, amino silane with alkaline, does not need to be adjusted. Because of the hydrolysis of silane, can not exist for long time, it is best now with the use of, suitable for one hour run out.
Silane coupling in the paint industry also use more. When the coating containing a small amount of silane coupling solvent. After the coating, the silane may migrate to the interface of coating and substrate, and inorganic surface water reaction, hydrolysis of silanols and with the hydroxyl groups on the surface of the substrate form hydrogen bonds and shrinkage synthetic - Si - M (M is inorganic surface), also the silane molecules between silanols and mutual condensation, oligomerization form a reticular structure of the film is covered on the substrate surface.
Even under the condition of water immersion, the modified coatings of silane coupling agent are well attached to various inorganic substrates.. The junction between the paint base and the bottom material layer, interaction between silane and paint base, forming silane and paint base of mutual penetration of the reticular structure, enhances the stability of cohesion and water erosion, and enable the stress to the modulus of the substrate to the low modulus of base paint transfer, thus significantly higher adhesion to the substrate.
The silane coupling agent is treated with pigment or fillers, which make it easy to wetting, pigment or fillers dispersed in the base material and prevent precipitation and agglomeration.. Filler surface treated by the modification with silane coupling agent and the coating viscosity greatly reduced, even if the size of pigments or fillers add a quantity to also won't affect the paint flow to paint production, reduce production cost.
Combined with silicon and aluminum hydroxide mineral and most easily with alkyl alkoxy silane and silica (can produce smoke and can be precipitated in the), glass beads, quartz, sand, talc, mica, clay and silica lime in the packing of the polymer can effectively is silane coupling agent processing. For example: the other metal hydroxide, magnesium hydroxide, iron oxide, copper oxide and tin oxide by its treatment effect is good.
With the rapid development of high performance and high functional composites, the properties and the use of silane coupling agents are also presented.. For example, to make a kind of coupling agent can adapt to a variety of resin, multi-functional silane; to eliminate the influence of filler (acid and alkali) properties of composite and need to can make the filler surface passivation of silane and so on.
Nowadays, single silane coupling agent is developing towards the direction of multiple compound use at the same time.. In addition, by means of modern analysis and testing, the interfacial characteristics and modification technology of composite materials can be further improved..

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