Environment-friendly trace lubricant and preparation method thereof

Abstract

The invention provides an environment-friendly lubricant composition which is characterized by comprising high fructose corn syrup, palmitic acid, monoethanolamine, sulfamic acid and water, and the molar ratio of the high fructose corn syrup to the palmitic acid is 1: (1-2). The weight ratio of the monoethanolamine is 10-15% of the sum of the high fructose corn syrup and the palmitic acid, the weight ratio of the sulfamic acid is 0.5-1% of the sum of the high fructose corn syrup and the palmitic acid, and the weight of the water is 7-10 times that of the sulfamic acid. The environment-friendly lubricant composition prepared by adopting the preparation method disclosed by the invention has better lubricity, good water solubility, good anti-rust performance and good hard water resistance, and can perfectly solve the cooling and lubricating effects when being used for minimum quantity lubrication. The invention also provides an environment-friendly trace lubricant containing the environment-friendly lubricant composition. The environment-friendly trace lubricant is prepared from the following components: the environment-friendly lubricant composition, oleoyl sarcosine, urea phosphate, polyvinyl alcohol and water.

Description

Technical Field

[0001] The invention belongs to the technical field of lubrication, and in particular relates to an environmentally friendly micro-lubricant and a preparation method thereof. Background Art

[0002] In the process of metal cutting, in order to effectively reduce the friction and deformation heat generated during the cutting process, and to improve the tool life and workpiece quality, cutting oil / cutting fluid is often used for a large amount of flushing lubrication and cooling. However, this traditional lubrication and cooling method has obvious disadvantages. Since the workpiece and debris will take away a large amount of lubricant during the processing, the amount of lubricant leakage is extremely large. This large amount of lubricant use not only causes a serious waste of resources, but also brings pollution problems to the processing site and environment.

[0003] At the same time, the various chemical components contained in the cutting oil / fluid may penetrate into the soil and water sources after leakage, causing long-term adverse effects on the ecological environment. In addition, the lubricant odor and volatile harmful gases diffused in the processing site also seriously affect the health of the operators. Long-term contact may lead to occupational diseases such as skin diseases and respiratory diseases.

[0004] In order to solve these problems, the research on micro-lubrication technology has made certain progress in recent years. Micro-lubrication technology has solved the problems of large leakage of the above lubricants and serious ecological pollution. Micro-lubricants developed with synthetic esters as base oils can basically achieve a relatively ideal lubrication effect, but during use, due to the excessive heat generated by instantaneous friction and deformation during processing, some ester molecules decompose and evaporate, producing unpleasant odors, which affects actual use. The use of some water in the micro-lubricant formula can make the friction and deformation heat dissipate faster, quickly reduce the local temperature of the processing area, and is beneficial to the workpiece accuracy and tool life. However, water-soluble micro-lubricants have certain defects in lubricity and long-term storage, so they are not used much in actual applications.

[0005] It is of practical significance to study the new environmentally friendly water-soluble trace lubricant technology. Summary of the invention

[0006] In view of the above problems, the present invention aims to overcome the deficiencies of the prior art and provide an environmentally friendly lubricant composition.

[0007] To achieve the above-mentioned purpose, the present invention provides an environmentally friendly lubricant composition, characterized in that it consists of high fructose syrup, palmitic acid, monoethanolamine, aminosulfonic acid and water, wherein the molar ratio of high fructose syrup to palmitic acid is 1:1-2; the weight ratio of monoethanolamine is 10-15% of the sum of high fructose syrup and palmitic acid, the weight ratio of aminosulfonic acid is 0.5-1% of the sum of high fructose syrup and palmitic acid, and the weight of water is 7-10 times that of aminosulfonic acid.

[0008] Since the main components of high fructose corn syrup are isomers of fructose and glucose, for the convenience of calculation, their molecular weight is unified as 180.16.

[0009] The above-mentioned high fructose corn syrup and palmitic acid can be subjected to an esterification reaction under the catalysis of aminosulfonic acid to generate polyhydroxy glucose fructose palmitate. The aminosulfonic acid does not need to be separated after the reaction is completed. The -NH2 and -SO3 remaining in the environmentally friendly lubricant composition can enhance the water solubility and resistance to hard water, and also have certain extreme pressure and anti-wear properties.

[0010] The monoethanolamine can completely neutralize the acidity of the catalyst aminosulfonic acid, while improving the hydrophilicity of fructose palmitate, maintaining the alkalinity of the lubricant composition, and improving the anti-rust effect and extreme pressure performance of the lubricant composition.

[0011] The present invention provides a method for preparing the above-mentioned environmentally friendly lubricant composition: Step 1, weighing aminosulfonic acid and adding it into water to dissolve it, to prepare an aminosulfonic acid aqueous solution; Step 2, weighing fructose syrup and palmitic acid, placing them in a reactor for mixing and stirring, adding aminosulfonic acid aqueous solution and reacting at 150-160° C. for 4-5 hours; during the reaction, decompressing and draining the water 1-2 times; Step 3: When the temperature in step 2 drops below 90° C., weigh monoethanolamine, add it into the reactor and stir it thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0012] The environmentally friendly lubricant composition prepared by the present invention has good lubricity, good water solubility, good rust prevention performance and hard water resistance, and can be used for micro-lubrication to perfectly solve its cooling and lubricating effects.

[0013] The above-mentioned environmentally friendly lubricant composition can be directly used as an environmentally friendly micro-lubricant by adding 1-5 times of water.

[0014] The prepared environmentally friendly lubricant composition can also be used to prepare an environmentally friendly micro-lubricant according to the following weight percentage components:

[0015] The preparation method of the above-mentioned environmentally friendly trace lubricant is as follows: urea phosphate and polyvinyl alcohol are added into hot water at 70-80°C and stirred to dissolve, and then the environmentally friendly lubricant composition and oleoyl sarcosine are added and stirred until completely transparent, thereby obtaining an environmentally friendly trace lubricant.

[0016] The above-mentioned environmentally friendly trace lubricant can be used after adding 0-3 times of water.

[0017] The above-mentioned oleoylsarcosine has good lubricity and rust resistance, and is also a good surfactant.

[0018] The urea phosphate can be prepared by reacting phosphoric acid and urea, and can improve the corrosion inhibition performance of metals while increasing extreme pressure properties.

[0019] The polyvinyl alcohol generally selects medium and low molecular weight products with a molecular weight of less than 120,000, and the product model is preferably PVA1788. The polyvinyl alcohol has good film-forming properties in the micro-lubricant, increases the viscosity of the lubricant aqueous solution, reduces the surface tension of the micro-lubricant, increases permeability and adhesion on the processed surface, and improves the lubrication effect.

[0020] Functions and Effects of the Invention The environmentally friendly lubricant composition prepared by the present invention has good lubricity, good water solubility, good rust prevention performance and hard water resistance, and can be used for micro-lubrication to perfectly solve its cooling and lubricating effects.

[0021] The oleoylsarcosine used in the present invention has good lubricity, rust resistance and biodegradability, and is also a good surfactant.

[0022] The urea phosphate used in the present invention can improve the corrosion inhibition performance of the metal and increase the extreme pressure performance.

[0023] The polyvinyl alcohol used in the present invention has excellent film-forming performance in the trace lubricant, enhances the viscosity of the lubricant aqueous solution, reduces the surface tension of the trace lubricant, increases the permeability and adhesion on the processed surface, and improves the lubrication effect.

[0024] The environmentally friendly micro-lubricant prepared by the present invention can meet the lubrication, cooling, environmental protection and rust prevention requirements of metal processing; when used in conjunction with a micro-lubricating device, the amount of lubricant used can be saved by more than 90%, and the energy-saving, emission-reduction and environmental protection effects are remarkable.

[0025] In the present invention, after the components are mixed, based on their respective structural characteristics, weak intermolecular bond forces may occur, and after mutual dissolution and promotion, the lubricity and solubility of each other are improved and stimulated. DETAILED DESCRIPTION Example 1

[0026] Step 1, weigh 22 g of aminosulfonic acid and add it into 160 g of water to dissolve it to prepare an aminosulfonic acid aqueous solution; Step 2, weighing 1801.6 g (10 mol) of fructose syrup and 2564.2 g (10 mol) of palmitic acid, placing them in a reactor for mixing and stirring, adding an aqueous solution of aminosulfonic acid and reacting at a temperature of 150° C. for 5 hours; during the reaction, the water was drained under reduced pressure twice; Step 3: When the temperature in step 2 drops below 90° C., weigh 450 g of monoethanolamine, add it into the reactor and stir thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0027] Weigh 10 g of urea phosphate and 10 g of polyvinyl alcohol (PVA1788) into 530 g of hot water at 70°C and stir to dissolve, then add 400 g of the environmentally friendly lubricant composition prepared above and 50 g of oleoyl sarcosine and stir until completely transparent to obtain an environmentally friendly trace lubricant. Example 2

[0028] Step 1, weigh 65 g of aminosulfonic acid and add it into 520 g of water to dissolve it to prepare an aqueous solution of aminosulfonic acid; Step 2, weighing 1801.6 g (10 mol) of fructose syrup and 5128.4 g (20 mol) of palmitic acid, placing them in a reactor for mixing and stirring, adding an aqueous solution of aminosulfonic acid and reacting at a temperature of 160° C. for 4 hours; during the reaction, the water was drained once under reduced pressure; Step 3: When the temperature in step 2 drops below 90° C., weigh 1000 g of monoethanolamine, add it into the reactor and stir thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0029] Weigh 20 g of urea phosphate and 5 g of polyvinyl alcohol, add them into 575 g of hot water at 80° C. and stir to dissolve, then add 300 g of the environmentally friendly lubricant composition prepared above and 100 g of oleoyl sarcosine and stir until completely transparent to obtain an environmentally friendly trace lubricant.

[0030] When using, add the environmentally friendly micro-lubricant prepared above into 1 times water and stir evenly. Example 3

[0031] Step 1, weigh 40 g of aminosulfonic acid and add it into 400 g of water to dissolve it to prepare an aqueous solution of aminosulfonic acid; Step 2, weigh 1801.6 g (10 mol) of fructose syrup and 3846.3 g (15 mol) of palmitic acid, place them in a reactor, mix and stir, add an aqueous solution of aminosulfonic acid, and react at 158° C. for 4 hours; during the reaction, reduce the pressure and drain the water once; Step 3: When the temperature in step 2 drops below 90° C., weigh 600 g of monoethanolamine, add it into the reactor and stir thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0032] 18 g of urea phosphate and 6 g of polyvinyl alcohol were weighed and added to 566 g of hot water at 70° C. and stirred to dissolve. Then, 320 g of the environmentally friendly lubricant composition prepared above and 90 g of oleoyl sarcosine were added and stirred until completely transparent to obtain an environmentally friendly trace lubricant.

[0033] When using, add the environmentally friendly micro-lubricant prepared above into 2 times water and stir evenly. Example 4

[0034] Step 1, weigh 50 g of aminosulfonic acid and add it into 450 g of water to dissolve it to prepare an aqueous solution of aminosulfonic acid; Step 2, weighing 1801.6 g (10 mol) of fructose syrup and 4102.7 g (16 mol) of palmitic acid, placing them in a reactor for mixing and stirring, adding an aqueous solution of aminosulfonic acid and reacting at a temperature of 155° C. for 4.5 hours; during the reaction, the water was drained once under reduced pressure; Step 3: When the temperature in step 2 drops below 90° C., weigh 700 g of monoethanolamine, add it into the reactor and stir thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0035] 14 g of urea phosphate and 8 g of polyvinyl alcohol were weighed and added to 518 g of hot water at 70° C. and stirred to dissolve. Then, 380 g of the environmentally friendly lubricant composition prepared above and 80 g of oleoyl sarcosine were added and stirred until completely transparent to obtain an environmentally friendly trace lubricant.

[0036] When using, add the environmentally friendly micro-lubricant prepared above into 3 times water and stir evenly. Example 5

[0037] Step 1, weigh 40 g of aminosulfonic acid and add it into 320 g of water to dissolve it to prepare an aqueous solution of aminosulfonic acid; Step 2, weighing 1801.6 g (10 mol) of fructose syrup and 3846.3 g (15 mol) of palmitic acid, placing them in a reactor for mixing and stirring, adding an aqueous solution of aminosulfonic acid and reacting at a temperature of 155° C. for 4 hours; during the reaction, the water was drained once under reduced pressure; Step 3: When the temperature in step 2 drops below 90° C., weigh 800 g of monoethanolamine, add it into the reactor and stir thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

[0038] 500 g of the environmentally friendly lubricant composition prepared above can be added with 1500 g of water as an environmentally friendly trace lubricant (sample 1) for experiment.

[0039] Weigh 30g of urea phosphate and 15g of polyvinyl alcohol (PVA1788) into 1115g of hot water at 70°C and stir to dissolve, then add 700g of the environmentally friendly lubricant composition prepared above and 140g of oleoyl sarcosine and stir until completely transparent to obtain an environmentally friendly trace lubricant.

[0040] Take 3 portions of the above-mentioned environmentally friendly trace lubricant, each of which is 500 g, add 500 g, 1000 g, and 1500 g of water respectively, stir until transparent, and use them as environmentally friendly trace lubricant samples 2, 3, and 4 for experiments.

[0041] The prepared environmentally friendly micro-lubricant (samples 1, 2, 3, and 4) was applied to the high-speed table saw to cut aluminum alloy profiles. The micro-lubricant was supplied using the micro-lubricating device (model KS-2106) produced by our company, and the surface roughness tester (model: TR270) was used to measure the machining surface accuracy. The sawing surface temperature was measured using a handheld thermometer. The workshop ambient temperature during the experiment was 28-29°C. The specific data is shown in the table below.

[0042]

[0043] It can be clearly seen from the above table that the prepared environmentally friendly micro-lubricant can basically meet the customer's micro-lubricating processing requirements. Sample 4 (maybe too much water was added) has a slightly worse lubrication effect, but the cooling effect can meet customer requirements.

[0044] Please refer to the following table for surface roughness grade (provided by the equipment provider, not experimental data):

Claims

1. An environmentally friendly lubricant composition, characterized in that , composed of high fructose syrup, palmitic acid, monoethanolamine, aminosulfonic acid and water, wherein the molar ratio of high fructose syrup to palmitic acid is 1:1-2; the weight ratio of monoethanolamine is 10-15% of the sum of high fructose syrup and palmitic acid, the weight ratio of aminosulfonic acid is 0.5-1% of the sum of high fructose syrup and palmitic acid, and the weight of water is 7-10 times that of aminosulfonic acid.

2. The method for preparing the environmentally friendly lubricant composition according to claim 1, characterized in that: Step 1, weighing aminosulfonic acid and adding it into water to dissolve it, to prepare an aminosulfonic acid aqueous solution; Step 2, weighing fructose syrup and palmitic acid, placing them in a reactor for mixing and stirring, adding aminosulfonic acid aqueous solution and reacting at 150-160° C. for 4-5 hours; during the reaction, decompressing and draining the water 1-2 times; Step 3: When the temperature in step 2 drops below 90° C., weigh monoethanolamine, add it into the reactor and stir it thoroughly until it becomes transparent, thereby obtaining an environmentally friendly lubricant composition.

3. An environmentally friendly micro-lubricant prepared from the environmentally friendly lubricant composition according to claim 1, characterized in that: The environmentally friendly lubricant composition is directly used as an environmentally friendly micro-lubricant by adding 1-5 times of water.

4. An environmentally friendly micro-lubricant prepared from the environmentally friendly lubricant composition according to claim 1, characterized in that: It is prepared from the following components in weight percentage: Environmentally friendly lubricant composition 30-40%; Oleoylsarcosine 5-10%; Urea phosphate 1-2%; Polyvinyl alcohol 0.5-1%; Water balance.

5. An environmentally friendly micro-lubricant as claimed in claim 4, characterized in that: The urea phosphate is prepared by reacting phosphoric acid and urea.

6. An environmentally friendly micro-lubricant as claimed in claim 4, characterized in that: The polyvinyl alcohol is selected as a medium-low molecular weight product with a molecular weight lower than 120,000.

7. An environmentally friendly micro-lubricant as claimed in claim 4, characterized in that: The polyvinyl alcohol selected is product model PVA1788.

8. A method for preparing an environmentally friendly trace lubricant as described in claims 4-7, characterized in that: Urea phosphate and polyvinyl alcohol are added into hot water at 70-80° C. and stirred to dissolve, and then the environmentally friendly lubricant composition and oleoyl sarcosine are added and stirred until completely transparent to obtain an environmentally friendly trace lubricant.

9. A method for using an environmentally friendly micro-lubricant as described in claims 4-7, characterized in that: The environmentally friendly micro-lubricant is used after adding 0-3 times of water.

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