The method of synthesizing loose monobutyltin oxide

2021-11-11   Pageview:60

Put 160kg of Na2CO3 into the reaction kettle and dissolve it with 2000kg of water for stirring, add 3000kg of ammonia with 20% concentration, weigh 80kg of additives and add 50% to the reaction kettle; control the temperature of the reaction kettle to 50°C with steam and cooling water; transfer 1500kg of monobutyltin trichloride into the reaction kettle slowly and then react at a constant temperature of 50°C for 2h. During the constant temperature Add 20% of the diluted additive every 30 minutes. After the reaction is finished, use the inserted extraction device to drain the liquid as much as possible, then add 3000kg of water with stirring and heating to 60℃ keep 30min and then drain the water, then repeat the water washing once. Then add 3000kg of water with stirring and pump into the centrifuge for centrifugation; after centrifugation is completed, transfer to vacuum drying oven for drying, drying temperature 85 ~ 95 ℃, and finally get monobutyltin oxide product 1075kg, yield of 99.3%. The assay index is as follows: Sn: 56.25%; Cl: 0.35%; purity: 99.1%.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The average molar mass of the polyether segment is generally controlled at 500~5000g/mol, <500g/mol can not fully exert the surface activity effect, and >5000g/mol will have too high viscosity and will make the dispersibility worse. The ratio of m to n is not strictly limited, and is generally controlled between (3:1) and (15+1). The terminal hydroxyl groups or different alkoxy groups and acyloxy groups of the polyether segment also have an effect on the surface activity. Considering surface activity and performance, the suitable viscosity of structure II polyether modified silicone oil is 100~8000mPa·s(25℃).

Therefore, we can change the ratio of these hydrophilic and hydrophobic segments to synthesize modified products with various physical properties and surface activities according to needs, forming a series of products with a wide range of applications, especially in water and organic solvents. Solubility in the medium, compatibility with the paint base, adjust the surface tension of the coating, and avoid the common negative effects of simethicone. Such additives are usually soluble in water, but show inverse solubility when the aqueous solution exceeds a certain temperature. It is similar to polyether, and polyether modified silicone oil aqueous solutions with different chemical structures have cloud points. It is soluble in organic solvents such as acetone, toluene, paraffin wax emulsion lower alcohols and certain hydrocarbons.
Carbon-containing functional group silicone oil is a type of silicone oil that has developed rapidly in the past 20 years. As an auxiliary agent, it is widely used in textile finishing, and its application in coatings has attracted more and more attention. It can also be considered as a polymer organic silicon coupling agent when used in coatings and other polymer composite materials. In composite materials, it can play a role in substrate wetting, filler wetting, dispersion and base resin cross-linking. The chemical structure of this type of silicone oil is:

CH: CH: CHACHs
R”-Si-O-(-SiO) (Si-O) Si-R”
CHaCHR’CH: Y
m, n=0…, the same or different, the number of which can be adjusted arbitrarily;
Y=-NH, -NH CH.CH NH, -NH–O-CHCH-CH
o-OC0CMe=CH, one SH, one NCO, one Ns, one SnRs, one P(O) (OR), and other functional groups;
R’has a hydrocarbylene group with 1 or ≥3 carbon atoms;
R” is a CHA or an organic group containing a carbon functional group.

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