Production method of carbamido thickening agent for lubricating grease

A production method and thickener technology, which are applied in thickeners, lubricating compositions, petroleum industry, etc., can solve the problems of inability to filter, reduce the use effect, workers' health and safety, etc., achieve convenient transportation and storage, lower threshold and cost, quality improvement

Active Publication Date: 2009-05-27
山东红星化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since isocyanates and some amines are highly toxic and/or volatile and/or corrosive, there are several problems in the production of urea-based grease by the above process: 1. Health and safety of workers
The current situation is that most urea-based grease manufacturers have not paid attention to this. In order to avoid the poisoning of harmful substances, workers often ignore the requirements of the production process for feeding speed, timing and quantity, and put it into the reactor early for convenience. It also leads to the problem that the product quality cannot be guaranteed
2. Most of isocyanates and amines are dangerous chemicals, and their transportation and storage are strictly controlled by relevant national laws and regulations, which will inevitably increase the transportation cost of these raw materials, and even affect the timeliness of the supply of these raw materials, especially the distance from the raw material origin Grease manufacturers farther away will have a more significant impact; in addition, isocyanate will self-polymerize and amine will volatilize, which requires high storage conditions, requires low-temperature storage, and storage time is also limited, otherwise the effective content will be affected, thereby reducing its use effect; Transportatio

Method used

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  • Production method of carbamido thickening agent for lubricating grease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Two 100L tanks (namely, the ester dissolving tank and the amine dissolving tank of the present invention) and a 250L reactor (also called reaction tank) are purged with nitrogen. Add 50kg of dioxane and 8.17kg of 4,4'-diphenylmethane diisocyanate into the 100L ester dissolving tank, stir, heat to 50℃ to dissolve, and set aside; add 50kg of dioxane into the 100L amine dissolving tank , Octadecylamine 8.67kg, cyclohexylamine 3.17kg, stirring, heating to 50 ℃ to dissolve, and then pump into the 250L reactor. The reactor is stirred, heated, and the temperature is controlled at 60°C. Then, within 1 hour, the 4,4'-diphenylmethane diisocyanate solution that has been dissolved and prepared before is uniformly pumped from the ester dissolving tank; 4,4'-diphenyl After adding the methyl methane diisocyanate solution, continue the equilibrium reaction and dispersion at 60°C—70°C for 1 hour; then, the reactor is evacuated, and the dioxane solvent is recovered through the condensation s...

Embodiment 2

[0019] Two 100L tanks and one 250L reactor were purged with nitrogen. Add 50kg of N,N-dimethylformamide into a 250L kettle; add 7.14kg of 4,4'-diphenylmethane diisocyanate into a 100L ester dissolving tank, heat to 80°C to melt, and set aside. Add 50kg of N,N-dimethylformamide, 11.53kg of octadecylamine, and 1.33kg of aniline into the 100L amine dissolving tank, stir, heat to 60℃ to dissolve, and then pump into the 250L reactor. The reactor is stirred, heated, and the temperature is controlled at 80°C, and then within 1 hour, the previously melted 4,4'-diphenylmethane diisocyanate; 4,4'-diphenyl is uniformly pumped from the ester dissolving tank After the addition of methane diisocyanate, continue the equilibrium reaction and dispersion at 80℃-100℃ for 1 hour; then, the reactor is evacuated and the N,N-dimethylformamide solvent is recovered through the condensation recovery system. The initial vacuum is -0.05Mpa (Table), the final vacuum degree is <-0.095Mpa (table), and the final...

Embodiment 3

[0021] Two 100L tanks and one 250L reactor were purged with nitrogen. Add 50 kg of ethyl acetate and 8.95 kg of 2,4-toluene diisocyanate into a 100L ester dissolving tank, stir, dissolve, and heat to 50°C for use. Add 50kg of ethyl acetate, 9.44kg of p-toluidine and 1.6kg of p-chloroaniline into the 100L amine dissolving tank, stir, heat to 50°C to dissolve, and then pump into the 250L reactor. The reactor is stirred, heated, and the temperature is controlled at 60°C. Then, within 1 hour, the 2,4-toluene diisocyanate solution that has been dissolved and prepared before is uniformly pumped from the ester dissolving tank; after the 2,4-toluene diisocyanate solution is added , Continue to equilibrate the reaction and disperse at 60℃—70℃ for 1 hour; then, the reactor is evacuated, the ethyl acetate solvent is recovered through the condensation recovery system, and the vacuum degree is gradually increased, and the final vacuum degree is <-0.095Mpa (table), and the material is finished ...

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Abstract

The invention relates to a method for producing a thickening agent for carbamido lubricating grease. The proposal comprises the following steps: sweeping a dissolving tank and a reactor used in the method by using nitrogen gas; adding a solvent to an ester dissolving tank metrically, then adding isocyanate to the ester dissolving tank metrically, and stirring, heating and dissolving the isocyanate; adding the solvent to an amine dissolving tank metrically, then adding an organic amine to the anime dissolving tank metrically, and stirring, heating and dissolving the organic amine; adding the amine solution and the isocyanate solution to a reactor, mixing and heating the solutions to finish the mixing within 0.5 to 2 hours, and continuing to perform balanced reaction and dispersion for 0.5 to 2 hours at a temperature of between 50 and 100 DEG C; vacuumizing the reactor, and condensing the reactor to reclaim the solvent; and introducing overheated water vapor to the reactor from the bottom thereof for 5 to 30 minutes, and cooling the temperature to below 80 DEG C to obtain the carbamido thickening agent. The method provides a nontoxic, harmless, environment-friendly and safe intermediate raw material which is convenient to transport and store for the production of carbamido lubricating oil, reduces the threshold and the cost for the production of the carbamido lubricating grease, and provides a material foundation for stabilizing and improving the quality of the caramido lubricating grease, and upgrading the import of the lubricating grease varieties.

Description

Technical field [0001] The invention relates to the field of preparation methods for intermediate raw materials of chemical products, in particular to a method for producing thickeners (including diurea, triurea, tetraurea and polyurea) used in urea-based grease. Background technique [0002] Urea-based grease has excellent high temperature performance, water resistance and acid resistance, and has the characteristics of moderate cost and long service life. It has been widely used in harsh and demanding fields such as metallurgy and chemical engineering. The proportion is increasing year by year. According to statistics from the American Lubricating Grease Association (NLGI), in 2006, China's grease output reached 279,000 tons, of which urea-based grease accounted for 3%, the United States accounted for 6%, and Japan as much as 23%. In 2008, the domestic urea-based grease is estimated to be about 10,000 tons. Based on 10% of the soap amount, it is estimated that 1,000 tons of ure...

Claims

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Application Information

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IPC IPC(8): C10M115/08
Inventor 秦军李庆吉徐伦义朱永华
Owner 山东红星化工有限公司
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