Dibutyltin maleate
White amorphous powder, irritating, toxic with tear-forming properties. Used as a heat stabilizer for end polyvinyl chloride.
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Numbering system
CAS No.: 78-04-6
MDL No.：MFCD00014120
EINECS No.：201-077-5
RTECS No.: JH4735000
BRN No.
PubChem No.: 24867599
Physical data
1. Property: White amorphous powder
2. Density (g/mL,25/4℃): Uncertain
3. Relative vapor density (g/mL,air=1): Uncertain
4. melting point (oC): 108-113℃
5. boiling point (oC, atmospheric pressure): uncertain
6. boiling point (oC,5.2kPa): uncertain
7. refractive index: uncertain
8. Flash point (oC): uncertain
9. specific rotation degree (o): uncertain
10. auto-ignition point or ignition temperature (oC): not sure
11. vapor pressure (kPa,25oC): uncertain
12. saturation vapor pressure (kPa,60oC): uncertain
13. heat of combustion (KJ/mol): uncertain
14. critical temperature (oC): uncertain
15. critical pressure (KPa): uncertain
16. the logarithmic value of the oil-water (octanol / water) partition coefficient: uncertain
17. the upper explosion limit (%,V/V): uncertain
18. lower explosion limit (%,V/V): uncertain
19. Solubility: slightly soluble in benzene and toluene, insoluble in water.
Toxicological data
1. Acute toxicity
Rat inhalation LC50: 313 mg/m3/4H
Caliber LD50 in mice: 470 mg/kg.
2、Reproductive toxicity.
Rat caliber LD50: 28 mg/kgSEX/DURATION
Mouse semi-lethal dose (intravenous): 56mg/kg
Nature and stability
Irritating, toxic with tear-emitting properties.
Storage method
This product should be sealed and stored. Packed in cardboard drums, stored in a ventilated and dry place.
Synthesis method
(1)Synthesis of dibutyltin oxide Put red phosphorus and butanol into the reaction kettle at room temperature, then add iodine in batches, stirring while adding, the temperature gradually increases as the reaction proceeds, and stop the reaction when the temperature reaches about 127℃. Add water to wash, and leave to stratify. The water layer is separated and the oil layer is fractionated to obtain refined iodobutane. Add iodobutane, solvent n-butanol and tin powder and magnesium flakes to the reaction kettle and react at 120-140℃ under strong stirring. After reaching the end point, distillation is carried out to recover n-butanol and unreacted iodobutane. The kettle liquid is iodobutyltin crude product. Add 10% hydrochloric acid, control the temperature 60 ~ 70 ℃ stirring and washing for half an hour, let stand and stratify, separate out the waste acid solution to obtain refined diiodobutyltin. Add 20% caustic soda solution to diiodobutyltin, stirring at a controlled temperature of 60°C, and carry out hydrolysis reaction. After the completion of hydrolysis, let it stand and stratify, after separating the aqueous layer, wash with water to obtain refined di-n-butyltin oxide.
(2) Preparation of finished product Add dibutyltin oxide and maleic anhydride to the reactor and carry out the condensation reaction at a controlled temperature of 60-70°C with stirring. The reaction product is dehydrated and filtered under reduced pressure, and the finished product is obtained.
Application
This product is a heat stabilizer for polyvinyl chloride, with excellent heat resistance and transparency, no sulfur pollution, and especially good long-term heat resistance, which can prevent products from turning yellow when processed at high temperatures.
The product is especially suitable for hard transparent products, and its high melting point does not reduce the softening point and impact of hard products. General dosage of 0.5-2%, and barium soap or cadmium soap with a synergistic effect, can further improve the stabilization effect, and dibutyltin laurate can be used to improve the transparency and heat resistance of products, and epoxy compounds can be used to reduce its tearing properties. The product lacks lubricity, poor processing performance; because of volatility; processing will sometimes blister; and, under the action of hydrogen chloride generated by heating, the product will translocate into fumarate, and resin compatibility decreases, easy to spray frost. In order to overcome these shortcomings, many modified varieties have been developed.
Safety Information
Hazardous transport code: UN 3146 6.1/PG 2
Hazardous Material Marking: Hazardous to the Environment
Safety marking: S26S28S45S60S61S36/S37
Hazardous symbol: R26R36/37/38R24/25R50/53
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