What's the difference between silicone and silicone? You'll find out after you read it.
What's the difference between silicone and silicone? Silicone is a kind of material that we are familiar with. Do you know silicone? Although their names are similar, they are very different. Here we may have some misunderstanding, today new Jiayi will take you to distinguish silicone and silicone resin, let's look at the following article.
1）, organic silicon
Organosilicon, or organosilicon compounds,
Refers to the compound containing si-C bond, and at least one organic group is directly connected to the silicon atom, is also commonly used to those by oxygen, sulfur, nitrogen, etc., the organic group is connected to the silicon atom of the compound is also regarded as organic silicon compound. Among them, polysiloxane composed of silicon-oxygen bond (-Si-0-Si-) as the skeleton is a large number of silicone compounds, deep research, widely used, accounting for more than 90% of the total amount.
Organosilicon materials have unique structures:
(1) The high energy polysiloxane main chain is shielded by sufficient methyl groups on Si atoms;
(2) C-H is non-polar, resulting in very weak intermolecular interaction force;
(3) Si-O bond length is long, Si-O-Si bond Angle is large.
(4) Si-O bond is a covalent bond with 50% ionic bond characteristics (covalent bond has directivity, ionic bond has no directivity).
2）, organic silicone resin
Silicone resins are highly crosslinked network structure of polysiloxane, usually with methyl trichlorosilane, dimethyl dichlorosilane, phenyl trichlorosilane, diphenyl dichlorosilane.
Various mixtures of methyl phenyl dichlorosilane are decomposed by adding water at lower temperatures in the presence of organic solvents such as toluene to give acidic hydrolysates. The initial products of hydrolysis are a mixture of circular, linear, and crosslinked polymers, often containing considerable hydroxyl groups. The hydrolysate is washed to remove the acid, and the neutral primary polycondensation polymer is thermally oxidized in air or further polycondensation in the presence of catalyst, after which a highly cross-linked three-dimensional network structure is formed.
Curing is usually achieved by condensation of siliconols to form silicon oxygen chains. When the condensation reaction is in progress, the reaction rate decreases due to the gradual reduction of the concentration of silanol, increasing steric resistance and poor fluidity.
