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Synthesis and Application of Water-Soluble Dibasic Ester

A dibasic acid ester, water-soluble technology, applied in the field of organic chemical synthesis, can solve the problems of large environmental pollution, chemical properties can not meet the actual use requirements of metalworking fluids, etc., and achieves low reaction temperature, good lubricity, and low addition amount. Effect

Inactive Publication Date: 2014-10-08
NEUFTECH BIOTECH HEFEI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The Chinese invention patent "A Method for Preparing Dibasic Ester" (Notice No. CN 101265184B) uses a solid acid catalyst to catalyze the esterification reaction. This solid acid catalyst is very polluting to the environment, and the patent uses C 1 ~C 4 low carbon alcohols and C 2 ~C 10 Dibasic carboxylic acid, the conversion rate is more than 90%, but the chemical properties of this synthetic ester cannot meet the actual use requirements of metalworking fluids

Method used

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  • Synthesis and Application of Water-Soluble Dibasic Ester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 150g of polyethylene glycol 600 and 27g of undecanedibasic acid into a flat-bottomed flask, stir well and add 0.354g of N-alkylpyrrolidone-containing group Acid ionic liquid catalyst, stirring, heating, controlling the temperature at 110°C, and reacting for 4 hours to obtain the final product. The reaction product is an orange-yellow viscous liquid with an acid value of 71.5 mgKOH / g. After adjusting the pH value of the product to 9.0 with diethanolamine, prepare a 5% working solution with tap water, and carry out the rust prevention test of cast iron chips according to the following method, and the rust resistance is 4 grades:

[0032] Antirust test method of cast iron shavings:

[0033] Take the filter paper and put it into a petri dish, weigh 2g±0.1g of cast iron filings, spread it on the filter paper, pipette 2ml of the solution to be tested, wet all the iron filings, cover the petri dish at 18-28 degrees Celsius for 2 hours, remove For cast iron chips, rinse...

Embodiment 2

[0037] Weigh 165g of polyethylene glycol 600 and 27g of undecanedibasic acid into a flat-bottomed flask, stir well and add 0.384g of N-alkylpyrrolidone group Acid ionic liquid catalyst, stirring, heating, controlling the temperature at 120°C, and reacting for 5 hours to obtain the final product. The reaction product is an orange-yellow viscous liquid with an acid value of 68 mgKOH / g. After the pH value of the product was adjusted to 9.0 with diethanolamine, a 5% working solution was prepared with tap water. According to the test method for rust prevention of cast iron chips in Example 1, the rust resistance was grade 4.

Embodiment 3

[0039] Weigh 187.5g of polyethylene glycol 600 and 27g of undecanedibasic acid into a flat-bottomed flask, stir well and add 0.429g of N-alkylpyrrolidone-containing group Acid ionic liquid catalyst, stirring, heating, controlling the temperature at 130°C, and reacting for 6 hours to obtain the final product. The reaction product is an orange-yellow viscous liquid with an acid value of 6.2 mgKOH / g. After adjusting the pH value of the product to 9.0 with diethanolamine, prepare a 5% working solution with tap water, and measure the rust resistance according to the cast iron scrap rust prevention test method of Example 1 to be grade 4.

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Abstract

The invention belongs to synthesis and an application of water-soluble dibasic acid ester, relating to the technical field of organic chemical synthesis methods, overcoming the defect that the traditional lubricating agent such as polyethylene glycol can not meet high load processing requirement and has no rust-proof function. Polyethylene glycol and long carbon chain binary acid are subjected to esterification under the action of a catalyst, a reaction mol ratio of the polyethylene glycol to the long carbon chain binary acid is 2.0-2.5, addition amount of the catalyst is 0.2-0.6%, reaction temperature is 110-130 DEG C, reaction is carried out for 4-6 hours at normal pressure, the polyethylene glycol is esterified, and carbon chain length of a lubricating material is increased, thus lubricating property of the synthesized ester is far better than that of the original polyethylene glycol; and meanwhile, reaction conditions can be controlled, thus the synthesized ester is monoester mainly, the synthesized monoester or diester is biodegradable and meets the requirement of being environmentally-friendly, and the synthesized ester has better lubricating property compared with the original polyethylene glycol and also has a certain rust-proof function.

Description

technical field [0001] The invention belongs to the technical field of organic chemical synthesis methods, and in particular relates to a method for synthesizing dibasic acids and the application of the dibasic acid esters in cutting solutions. Background technique [0002] With the development of metallurgy, ships, automobiles, aerospace and other technologies, there are more and more metal parts that need to be formed and cut, and they are getting bigger and bigger, and the precision required is getting higher and higher. It is also getting higher and higher, and it is difficult for traditional lubricants such as polyethylene glycol to meet the high-strength machining environment. [0003] At present, the lubricants used in metalworking fluids such as polyether, polyethylene glycol, polyether ester, polyvinyl alcohol ester, etc. only have lubricity, but metalworking fluids require not only lubricity, but also certain rust resistance. function to ensure that the processed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/34C07C67/08C08G65/48C10M173/00C10M129/76C10M145/38C10N30/06C10N30/12C10N40/22
Inventor 余杨柳
Owner NEUFTECH BIOTECH HEFEI
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