Silane coupling agent, silane cross-linking agent
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There are many types of silicones, among which the relatively similar ones include silane coupling agents and cross-linking agents. Generally, it is difficult to understand for those who are new to silicones. Can I ask about the two? What are the connections and differences between them?
 Silane coupling agent
It is a type of organic silicon compound containing two different chemical properties at the same time, which is used to improve the actual bonding strength of polymers and inorganic substances. . This may refer to the improvement of real adhesion, or the improvement of wettability, rheology and other operating properties. The coupling agent may also modify the interface area to enhance the interaction between the organic phase and the inorganic phase. Boundary layer.
Therefore, Silane Joint agents are widely used in adhesives, coatings and inks, rubber, casting, fiberglass, cables, textiles, plastics, fillers, surface treatment and other industries.
its classic products are available The general formula XSiR3 represents.
Formula,X is a non-hydrolyzable group, including alkenyl groups (mainly Vi) and those with functional groups such as Cl and NH2 at the end Hydrocarbon group, that is, carbon functional group; R is a hydrolyzable group, including OMe, OEt, etc.
The functional groups in Polymer connection; when the functional group is hydrolyzed, Si-R is converted into Si-OH, and by-product HR is generated, such as MeOH, EtOH, etc. Si-OH can be combined with Si-OH in other molecules or on the surface of the treated substrate Si-OH undergoes condensation and dehydration reaction to form Si-O-Si bond, and can even react with certain oxides to form stable Si-O bond, allowing silane to connect with inorganic substances or metals.
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According to the condensation reaction product Different types of single-component room temperature vulcanized silicone rubber can be divided into different types such as deacidification type, deketoxime type, dealcoholization type, deamination type, deamidation type, deacetone type, etc. Among them, the first three types are large-scale General products produced.
Take acetoxysilane cross-linking agent as an example. Since the condensation reaction product is acetic acid, it is called deacetic acid room temperature vulcanized silicone rubber.
Generally speaking, Cross-linking agents are different from silane coupling agents, but there are exceptions. For example, α-series silane coupling agents represented by anilinomethyltriethoxysilane are obtained in one-component dealcoholized room temperature vulcanized silicone rubber. Wide range of applications.
Common silane cross-linking agents are:
dealcoholized silane ：Alkyltriethoxy, methyltrimethoxy
Deacidified silane : Triacetoxy, propyltriacetoxysilane
Deketoxime type Silane: Vinyltributyloximesilane, methyltributyloximesilane
The action mechanism of silane cross-linking agent:
 Simply put, hand over Coupling agents connect the same things; coupling agents connect different things. So, do you now know how to distinguish silane coupling agents and silane cross-linking agents?
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