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Method for preparing dibutyltin dilaurate catalyst

A technology of dibutyltin laurate and dibutyltin oxide, applied in the direction of tin organic compounds, can solve the problems of incomplete reaction of lauric acid, high production cost, many side reactions, etc. The effect of high utilization

Inactive Publication Date: 2012-06-27
湖北新蓝天新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to reasons such as the above-mentioned reaction time and reaction temperature, the reaction of lauric acid is not complete, and there are many side reactions, which cause problems such as higher production cost and easy crystallization.

Method used

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  • Method for preparing dibutyltin dilaurate catalyst

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preparation example Construction

[0021] The preparation method of the dibutyltin dilaurate catalyst that the embodiment of the present invention provides comprises the following steps:

[0022] A. Feed lauric acid and dibutyltin oxide in a molar ratio of 1.7 to 2:1 (preferably a molar ratio of 1.82 to 1.9:1), stir and heat. When the temperature rises to 50°C, the reaction system begins to Negative pressure;

[0023] B. Continue heating, raise the temperature to 80°C-88°C, maintain the system temperature for continuous reaction for 2 hours, then stop the negative pressure, add acetic anhydride, and continue stirring for 1 hour;

[0024] C. The solution obtained by the reaction is compounded with additives according to a certain mass ratio, and finally the finished product is obtained. The compounding aid is at least one of acetic acid, DOP (dioctyl phthalate), phenyl ether, dodecylbenzene, and coconut oil. When the compounding aid of the solution included acetic acid, the acetic acid and the solution The mas...

Embodiment 1

[0029] A. Weigh 480g of lauric acid and 300g of dibutyltin oxide (molar ratio is 1.99:1), put them in a 1000mL three-neck flask, then start stirring and heating to raise the temperature. When the temperature rises to 50°C, the system starts to have negative pressure;

[0030] B. Continue heating, raise the temperature to 80°C, continuously remove the moisture generated by the reaction through negative pressure, maintain the system temperature for continuous reaction for 2 hours, then stop the negative pressure, add a certain amount of acetic anhydride into the three-necked flask, and continue to stir for 1 hour;

[0031] C, after cooling, get the solution that 50g reacts to obtain, add compounding auxiliary agent: 1.8g acetic acid, 2.8gDOP and 5.4g coconut oil (the mass percent of acetic acid, DOP and coconut oil and solution are respectively 3.0%, 4.7% and 9.0%) %), finally get the finished product. Under the condition that the temperature is 2°C, the finished product is no...

Embodiment 2

[0033] In the present embodiment, except that the following circumstances are different from embodiment 1, all the other are the same as embodiment 1: 460g of lauric acid and 300g of dibutyltin oxide are weighed in step A (the molar ratio is 1.91: 1), heated in step B The temperature was raised to 85°C, and 100 g of the reaction product was taken in Step C, and the compounding aids added were 9.0 g of DOP and 3.5 g of phenyl ether (the mass percentages of DOP and phenyl ether to the solution were 8.0% and 3.1%, respectively).

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Abstract

The invention discloses a method for preparing a dibutyltin dilaurate catalyst. The method comprises the following steps of: adding lauric acid and dibutyl tin oxide, stirring, and heating, wherein when the temperature is raised to 50 DEG C, the reaction system has negative pressure; continuously heating to the temperature of between 80 and 88 DEG C, maintaining the temperature of the system, performing continuous reaction for 2 hours, stopping the negative pressure, adding acetic anhydride, and continuously reacting for 1 hour with stirring; and compounding the solution obtained by the reaction and auxiliary agents in a certain mass ratio, and thus obtaining a finished product. The method is optimized on the basis that the activity of the catalyst is not reduced, and is easy to operate and convenient to control; the lauric acid is basically completely reacted, so the utilization rate of the raw material is high, the energy consumption is relatively low, loss of the materials and waste of the energy are avoided, the production cost is reduced, and the side reaction is little; and the product is difficult to crystallize, and the freezing point of the product is obviously reduced.

Description

technical field [0001] The invention relates to the field of catalyst preparation of room temperature vulcanized silicone rubber, in particular to a preparation method of a dibutyltin dilaurate catalyst. Background technique [0002] Dibutyltin dilaurate (DBTDL for short) is a kind of multi-purpose organotin catalyst with high boiling point after special liquefaction treatment. It is a colorless or light yellow oily liquid and turns into white crystals at low temperature. Dibutyltin dilaurate is soluble in most common solvents such as benzene, toluene, acetone, ethyl acetate, chloroform, carbon tetrachloride, benzene, ethanol, petroleum ether and various industrial plasticizers, and insoluble in water. It is an important part of the catalytic system in various chemical reactions. [0003] Dibutyltin dilaurate is not only used as a high-efficiency catalyst in the manufacture of wood varnishes, PU (Polyurethane, polyurethane, referred to as polyurethane) coatings, metal inks,...

Claims

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Application Information

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IPC IPC(8): C08G77/08C07F7/22
Inventor 王成肖俊平吴崇吴陈邹泓王度谭亮费冬冬
Owner 湖北新蓝天新材料股份有限公司
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