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Monobutyltin Oxide commonly called MBTO – is an organotin compound.
The amorphous, white powder is almost insoluble in water or organic solvents.
Monobutyltin Oxide can only be easily dissolved in bases / alkalis and mineral acids.
CAS: 2273-43-0
MF: C4H10O2Sn
MW: 208.83
EINECS: 218-880-1
Synonyms
BUTYLENESTANNONIC ACID;BUTYLTINHYDROXIDE-OXIDE;BUTYLTIN(IV) HYDROXIDE OXIDE;BUTYLSTANNOIC ACID;N-BUTYLSTANNOIC ACID;N-BUTYLTIN HYDROXIDE OXIDE;N-BUTYLTIN SESQUIOXIDE;1-butanestannonicacid
Monobutyltin Oxide is hydrolytically stable and is used as a versatile neutral catalyst in numerous the chemical industry processes.
Monobutyltin Oxide is primarily used for the production of polyester resins and alkyd resins, in the catalysis of esterification reactions, transesterification reactions and of polycondensation reactions up to 240 °C.
The catalyst is integrated into the final product with no impact on quality.
As such, processes with Monobutyltin Oxide do not require subsequent neutralization or filtering the catalyst out.
Monobutyltin Oxide makes for a technically simple application process.
Monobutyltin Oxide significantly shortens esterification times – 20% to 25% less reaction time when compared to tin-free catalysts – enabling reaction at lower temperatures, saving energy and increasing the efficiency of both process and plants.
Another advantage of Monobutyltin Oxide is in reducing undesirable side reactions, such as dehydration or oxidative decomposition of polyhydric alcohols
The catalyst can be modified in advance with other ligands and requires no special handling measures, only the avoidance of excessive moisture.
Monobutyltin Oxide is of higher quality in comparison with lithium-based catalysts – offering improved color properties and less haze formation.
The effectiveness of Monobutyltin Oxide catalysts is proven for a number of short, medium and long oil alkyds.
Monobutyltin Oxide is an amorphous white solid phase transfer catalysts.
Monobutyltin Oxide is hydrolytically stable and can be used in the synthesis of saturated polyester resins for powder coatings and coil coatings, as well in the production of unsaturated polyester resins for gel-coat, sheet molding, and cast molding applications.
Monobutyltin Oxide might be used also to produce polymeric plasticizers.
Monobutyltin Oxide is used primarily to catalyze esterification and polycondensation reactions at temperature between 210°C and 240°C (stable up to 250°C).
Monobutyltin Oxide begins to solubilize in carboxylic acid at 80°C during the reaction and becomes incorporated into the final product without affecting the quality of the product.
For this reason Monobutyltin Oxide does not require neutralization or filtration at the end of production.
Monobutyltin Oxide can significantly shorten esterification times, offers energy savings due to lower reaction temperatures, with a consequent more efficient use of equipment.
Monobutyltin Oxide minimizes side reactions such as dehydration and oxidative degradation of polyhydric alcohols, especially secondary alcohols.
Monobutyltin Oxide can be charged up front with other reactants, and requires no special handling other than avoiding excessive exposure to moisture.
Monobutyltin Oxide Chemical Properties
Boiling point: 350 °C
Density: 1,46 g/cm3
Vapor pressure: 24.4Pa at 25℃
Storage temp.: Store below +30°C.
Solubility: 9.5mg/L in organic solvents at 20 ℃
Form: powder to crystal
Color: White to Almost white
Specific Gravity: 1.46
Water Solubility: 317-3200μg/L at 20℃
Hydrolytic Sensitivity 4: no reaction with water under neutral conditions
Sensitive: Hygroscopic
LogP: 0.2-1.477 at 20-25℃
CAS DataBase Reference: 2273-43-0(CAS DataBase Reference)
EPA Substance Registry System: Monobutyltin Oxide (2273-43-0)
Uses
Monobutyltin Oxide is mainly used as a catalyst for the production of saturated polyester resins such as powder coatings, coil (steel) coatings, insulating paints, and unsaturated polyester resins.
Used as plastic stabilizer raw materials, organotin intermediates, esterification reaction catalysts, electrophoretic electrodeposition coating catalysts.
1. Monobutyltin Oxide is suitable for the synthesis of unsaturated polyester resin.
2. Monobutyltin Oxide is suitable for the production of unsaturated polyester resin.
3. Monobutyltin Oxide is suitable for the production of polymeric plasticizer.
Monobutyltin Oxide is mainly used as a catalyst in the production of saturated polyester resins such as powder coatings, coil (steel) coatings, and insulating varnishes, and as a catalyst in the production of unsaturated polyester resins; Monobutyltin Oxide is used as a raw material for plastic stabilizers, an organic tin intermediate, an esterification reaction catalyst, and an electrophoretic electrodeposition coating catalyst.
Plastic stabilizer raw materials, polyurethane catalysts, organotin intermediates, esterification catalysts, electrophoretic electrodeposition coating catalysts.
Preparation
Weigh 12gNa2CO3 into a reaction bottle and stir and dissolve Monobutyltin Oxide with 200g of water, add 200g of ammonia water with a concentration of 20% to put the reaction bottle into a water bath and raise the temperature to 50 ℃; Weigh 1g of additive, dilute with 20g of water, take 50% and add it to the reaction bottle; Weigh 100g of monobutyltin trichloride liquid, put it into a constant pressure funnel and slowly drop it into the reaction bottle, constant temperature reaction for 2h.
The diluted additive 20% is added every 30 minutes during the constant temperature process.
After the reaction is over, the mono-butyl tin oxide obtained from the reaction is filtered by a cloth funnel, the filter cake is transferred into a 500Ml beaker and about 200ml of water is added for washing, the washing temperature is controlled at 50-60 ℃, and the filter cake is filtered by suction after repeated twice.
The obtained filter cake is dried by a rotary evaporator at a drying temperature of 70-80 ℃, and finally 70.78g Monobutyltin Oxide is obtained with a yield of 99.1%.
