Monobutyltin oxide is usually synthesized by reacting tetrabutyltin with tetrachlorotin and separating monobutyltin trichloride and dibutyltin dichloride according to their boiling points.
The monobutyltin trichloride aqueous solution is converted into monobutyltin oxide product under alkaline conditions, then washed, centrifuged and dried to produce the product.
The relationship between the viscosity of methyl silicone oil and the molar mass or the degree of polymerization of silicone-oxygen chains. The viscosity and molar mass of methyl silicone oil can be calculated by calculation. Figure 16-1 shows the relationship between the viscosity of dimethyl silicone oil and the molar mass or degree of polymerization. Among them, the viscosity above 100mm³/s is calculated according to the Barry formula, and the viscosity below 100mm²/s is calculated according to the Warrk formula.
602 coating additives
(CHa) The relative molecular mass 74 of the 2SiO chain link is calculated by the following formula:
Degree of polymerization (n)=M/74 (M is the molar mass)
When n=0, the viscosity is 0.65mm”/s; when n=2230, the viscosity is 1000000mm/s.
Methyl silicone oil has the best viscosity-temperature characteristics among paraffin emulsion msds various organic liquids (the viscosity changes the least with temperature), and it is also the best among all kinds of silicone oils. The slope of the viscosity-temperature curve (viscosity-temperature coefficient) of various silicone oils is in the following order: dimethyl silicone oil, methyl hydrogen silicone oil <ethyl methyl silicone oil <low phenyl content methyl phenyl silicone oil, trifluoropropylene Base methyl silicone oil <high phenyl content methyl phenyl silicone oil, polyether modified silicone oil.
The surface tension of methyl silicone oil is very low. For example, when the viscosity is 0.65mm/s (25℃), the surface tension is only 15.9mN/m; when the viscosity of silicone oil increases, the surface tension also increases; but when the viscosity of methyl silicone oil reaches Above 50mm/s (25°C), the surface tension increases to a constant value of 21.5mN/m.
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