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Synthetic method for preparing dibutyltin dilaurate
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A kind of technology of dibutyltin cinnamate, synthesis method
Inactive Publication Date: 2015-06-03
JIANGSU XINLU CHEM NEW MATERIAL
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Summary
Abstract
Description
Claims
Application Information
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Problems solved by technology
The above-mentioned improved processes have their own advantages, but there are generally problems such as many preparation steps and the use of many solvents and additives, which increase the production cost to a certain extent.
Method used
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Examples
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Effect test
Embodiment 1
[0025] Example 1
[0026] Add 700g of benzene in the reactor as a solvent, then add 400.6g of lauric acid and 303.8g of dibutyl tin dichloride, control the reaction temperature at 35°C, and drop 300g of tripropylamine under normal pressure for 3.5 hours until the material pH=7.5 when the reaction ends.
[0027] Add 230 g of water and 15 g of hydrochloric acid into the reactor, and separate and collect the aqueous layer solution when the pH of the aqueous layer after standing and stratifying is 6.5.
[0028] Heat the material to 50°C to evaporate the solvent. When there is no more solvent distilled out in the distillation condenser, stop vacuuming and heating, and control the vacuum pressure to an absolute pressure of 0.009MPa.
[0029] Filter the distilled product to obtain the product dibutyltin dilaurate.
[0030] The product dibutyltin dilaurate synthesized by the present embodiment has a yield of 85.1%.
Embodiment 2
[0032] In the reactor, add 840g sherwood oil as solvent, then add 400.6g lauric acid and 303.8g dibutyl tin dichloride, control reaction temperature 30 ℃, drop 220g dipropylamine in 3 hours under normal pressure, to material pH= At 7:00 the reaction ended.
[0033] Add 200 g of water and 18 g of hydrochloric acid into the reactor, and separate and collect the aqueous layer solution when the pH of the aqueous layer after standing and stratifying is 6.
[0034] Heat the material to 40°C to evaporate the solvent. When there is no more solvent in the distillation condenser, stop vacuuming and heating, and control the vacuum pressure to an absolute pressure of less than 0.008MPa.
[0035] Filter the distilled product to obtain the product dibutyltin dilaurate.
[0036] The product dibutyltin dilaurate synthesized by the present embodiment has a yield of 89.4%.
Embodiment 3
[0038] In the reactor, add 800g benzene as solvent, then add 400.6g lauric acid and 303.8g dibutyl tin dichloride, control reaction temperature 30 ℃, drop 230g triethylamine in 4 hours under normal pressure, to material pH= At 8 o'clock the reaction ended.
[0039] Add 230 g of water and 15 g of hydrochloric acid into the reactor, and separate and collect the aqueous layer solution when the pH of the aqueous layer after standing and stratifying is 7.
[0040] Heat the material to 50°C to evaporate the solvent. When there is no more solvent in the distillation condenser, stop vacuuming and heating, and control the vacuum pressure to an absolute pressure of less than 0.007MPa.
[0041] Filter the distilled product to obtain the product dibutyltin dilaurate.
[0042] The product dibutyltin dilaurate synthesized by the present embodiment has a yield of 88.6%.
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Abstract
The invention discloses a synthetic method for preparing dibutyltin dilaurate. The synthetic method comprises the following step: by taking lauric acid and dibutyltin dichloride as raw materials, performing synthetic reaction under the action of a solvent under the condition that a molar ratio of lauric acid to dibutyltin dichloride is 2:1. The synthetic method is characterized in that a catalyst is also added in a synthetic process, wherein the catalyst is any one or a mixture of any two of tripropylamine, triethylamine and dipropyl amine, or is a mixture of tripropylamine, triethylamine and dipropyl amine. According to the synthetic method for preparing dibutyltin dilaurate disclosed by the invention, dust raw materials are not involved, an alkalization process can be eliminated, washing wastewater can be recycled, and the discharge quantity of wastewater can be reduced; the cyclic utilization efficiency can be improved, and the production cost can be reduced; and moreover, the synthetic method is simple in production equipment, ensures that reaction and separation can be completed by using a single kettle (reactor), and ensures that the cost can be saved.
Description
technical field [0001] The invention relates to a synthesis method for preparing dibutyltin dilaurate, which belongs to the field of organic synthesis. Background technique [0002] Dibutyltin dilaurate is an organotin additive. Dibutyltin dilaurate is a light yellow or colorless oily liquid at room temperature and formed at low temperature. White crystal, can be used in PVC plastic additives, has excellent lubricity, transparency, and weather resistance. Good resistance to sulfidepollution. It can be used as a stabilizer in soft transparent products, as a high-efficiency lubricant in hard transparent products, and can also be used as a catalyst for the crosslinking reaction of acrylate rubber and carboxyl rubber, the synthesis of polyurethane foam and polyester, room temperature vulcanized silicone rubber catalyst. [0003] The current general synthesis process is: use tetrabutyltin and tintetrachloride as raw materials to react to obtain dibutyltin dichloride, then di...
Claims
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Application Information
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