CN111876225A - Water-soluble cutting fluid capable of being recycled, purified and regenerated, preparation method and application - Google Patents

Water-soluble cutting fluid capable of being recycled, purified and regenerated, preparation method and application Download PDF

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CN111876225A
CN111876225A CN202010559417.7A CN202010559417A CN111876225A CN 111876225 A CN111876225 A CN 111876225A CN 202010559417 A CN202010559417 A CN 202010559417A CN 111876225 A CN111876225 A CN 111876225A
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cutting fluid
water
stirring
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刘昊
周月明
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Nanjing Haoxiang New Material Technology Co ltd
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Nanjing Haoxiang New Material Technology Co ltd
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Abstract

The invention discloses a recyclable, purified and regenerated water-soluble cutting fluid, and a preparation method and application thereof, and belongs to the field of industrial media. The paint comprises the following components in parts by weight: 50-56 parts of naphthenic silicone oil, 5-7 parts of extreme pressure lubrication corrosion inhibitor, 10-12 parts of oily lubricating oil, 2-4 parts of antirust agent, 3-8 parts of alkaline retaining agent, 5-6 parts of span 80, 2-4 parts of fatty alcohol-polyoxyethylene ether, 4-6 parts of bactericide and 8-12 parts of deionized water. The pH of the cutting fluid is kept stable by adding excessive alkaline maintaining agent; the water-soluble low-molecular-weight chitosan reacts with pyridine to generate a chitosan derivative, so that the bacteriostatic effect on anaerobic microorganisms is enhanced; and finally, after the water-soluble cutting fluid is recycled, the metal powder is adsorbed through microelectrode reaction on the activated carbon, so that the interaction between the metal powder and the cutting fluid is reduced. The recyclable performance of the water-soluble cutting fluid is improved.

Description

Water-soluble cutting fluid capable of being recycled, purified and regenerated, preparation method and application
Technical Field
The invention belongs to the field of industrial media, and particularly relates to a recyclable, purified and regenerated water-soluble cutting fluid, and a preparation method and application thereof.
Background
The water-soluble cutting fluid plays roles of lubrication, cooling, cleaning, rust prevention and the like in the machining process so as to obtain good surface precision and workpiece quality. However, the service life will directly affect the persistence of these effects. For the cutting fluid which exceeds the service life, the original efficacy of the cutting fluid is lost, and the operation environment of an operator is seriously threatened. Therefore, the enterprises have to dispose of the waste fluid and replace it with new cutting fluid, which not only causes economic problems, but also causes certain environmental problems.
Through careful study, the applicant finds that the functional failure of the water-soluble metal cutting fluid mainly comprises the following reasons: 1. the metal powder generated in the metal cutting process and the continuous accumulation of impurities such as external oil stain, dissolved mineral substances, dust and the like interact with the oil phase in the cutting fluid, so that the balance of all phases of the cutting fluid is lost, and the stability of the cutting fluid is reduced and the cutting fluid is deteriorated; 2. bacteria and other organic microorganisms are easily bred in the cutting fluid containing impurities, wherein anaerobic bacteria are taken as the main bacteria, so that the function of the antirust agent is further disabled; 3. moreover, the pH value of the cutting fluid is changed due to metabolites of anaerobic bacteria, so that effective components in the cutting fluid are degraded, and the cutting fluid is invalid.
Disclosure of Invention
The purpose of the invention is as follows: provides a water-soluble cutting fluid capable of being recycled, purified and regenerated, a preparation method and application thereof, so as to solve the problems involved in the background technology.
The technical scheme is as follows: a water-soluble cutting fluid capable of being recycled, purified and regenerated comprises the following components in parts by weight:
50-56 parts of cycloalkyl silicone oil;
5-7 parts of an extreme pressure lubrication corrosion inhibitor;
10-12 parts of oily lubricating oil;
2-4 parts of an antirust agent;
3-8 parts of an alkaline retention agent;
805-6 parts of span;
2-4 parts of fatty alcohol-polyoxyethylene ether;
4-6 parts of a bactericide;
8-12 parts of deionized water.
Preferably, the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate in a mass ratio of 1: (1-2), wherein the alkyl propane diamine derivative has the following structure:
Figure 347268DEST_PATH_IMAGE001
wherein R is a saturated alkyl chain or an unsaturated alkyl chain, and R' is-CH2CH2CH2NH2Or H;
the O-benzotriazole-N, N, N ', N' -tetramethyluronium tetrafluoroborate has the following structure:
Figure 725160DEST_PATH_IMAGE002
。
preferably, the alkaline maintaining agent comprises at least one of monoethanolamine, triethanolamine, isopropanolamine, diglycolamine, 2-amino-2-methyl-1-propanol.
Preferably, the bactericide is polypyridine acetyl-chitosan or polypyridine acetyl-N-trimethyl chitosan, and the structural formula is as follows:
Figure 529168DEST_PATH_IMAGE003
or
Figure 992510DEST_PATH_IMAGE004
；
Wherein n is 10 to 50.
Preferably, the synthesis process of the polypyridine acetyl-chitosan is as follows:
step 1, weighing a proper amount of micromolecular chitosan, adding the micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying;
and 2, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine into a water bath at the temperature of 60-80 ℃, stirring and reacting for 24-48 h, adding excessive diethyl ether to generate a large amount of precipitate, standing, performing suction filtration, washing with diethyl ether, and drying.
Preferably, the synthesis process of the polypyridine acetyl-N-trimethyl chitosan is as follows:
step 1, adding micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, then adding methyl bromide, sodium bromide and 20wt% of potassium hydroxide solution, uniformly stirring, and stirring and reacting for 1-2 hours in a water bath condition at the temperature of 60-80 ℃; after the reaction, adding excessive ether, generating powdery precipitate, centrifuging and washing to obtain white powder.
Step 2, adding the white powder into an N-methyl-2-pyrrolidone solvent, and repeating the step 1-3 times to obtain high-purity white powder;
step 3, weighing the white powder, adding the white powder into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying;
and 4, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine, stirring and reacting for 24-48 h in a water bath condition at the temperature of 60-80 ℃, adding excessive ether to generate a large amount of precipitate, standing, performing suction filtration, washing with ether, and drying.
The invention also provides a preparation method of the recyclable, purified and regenerated water-soluble cutting fluid, which comprises the following steps:
step 1, mixing naphthenic silicone oil, an extreme pressure lubrication corrosion inhibitor and lubricating oil into a reaction kettle, heating to 60-80 ℃, uniformly stirring, adding 1/3 deionized water, and continuously stirring; adding the antirust agent and the bactericide which are dissolved by ethanol in batches, and stirring for 30-45 min;
step 2, adding span 80 and fatty alcohol-polyoxyethylene ether into 1/3 deionized water, repeatedly dissolving, then adding into the reaction kettle in the step 1, and stirring for 60-100 min at 50-60 ℃;
and 3, finally adding the rest deionized water and the alkaline maintaining agent, and stirring until the solution becomes milky and semitransparent.
The invention also provides application of the recyclable, purified and regenerated water-soluble cutting fluid in a cutting process, which is characterized in that the water-soluble cutting fluid needs to be subjected to modified activated carbon adsorption treatment after being recycled.
Preferably, the synthesis process of the modified activated carbon adsorption comprises the following steps: weighing a proper amount of commercially available activated carbon, cleaning with deionized water, and drying; and then adding the cobalt-loaded modified activated carbon into a cobalt nitrate solution, mechanically stirring for 0.5-1 h, filtering, washing with deionized water, putting the cobalt-loaded activated carbon into an oven, activating for 4-6 h at 200-220 ℃, and cooling to obtain the cobalt-loaded modified activated carbon.
Has the advantages that: the invention relates to a water-soluble cutting fluid capable of being recycled, purified and regenerated, and a preparation method and application thereof, and compared with the prior art, the water-soluble cutting fluid has the following advantages:
1. because the formula system does not contain inorganic salts such as nitrite, phosphate, metasilicate, chromate and the like, the environment pollution is relatively small, and white residues can not be generated on the surface of the metal after drying.
2. The preparation method comprises the following steps of mixing an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate according to the mass ratio of 1: (1-2) compounding, and forming a layer of compact monomolecular adsorption film on the surface of the metal through the action of hydrogen bonds, so as to achieve the purpose of long-term rust prevention.
3. Adding excessive alkaline maintaining agent to maintain the pH of the cutting fluid stable and slow down the change of the pH value of the cutting fluid; further prevents the effective components in the cutting fluid from being degraded and prevents the cutting fluid from losing efficacy.
4. According to the invention, the water-soluble low-molecular-weight chitosan reacts with pyridine to generate the chitosan derivative, and compared with the existing broad-spectrum bactericide of which most bactericides are inorganic salts, the chitosan derivative has a high-efficiency antibacterial effect on anaerobic microorganisms.
5. After the water-soluble cutting fluid is recycled, the water-soluble cutting fluid needs to be subjected to modified activated carbon adsorption treatment. Through microelectrode reaction on the activated carbon, the metal powder can be effectively adsorbed, the interaction between the metal powder and the cutting fluid is avoided, and the problems of unbalance and deterioration of each phase of the cutting fluid are further avoided.
Drawings
FIG. 1 is a comparative graph showing the appearance of the bath solution before (left) and after (right) 180 days of recycling of the cutting fluid obtained in example 3 of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
Through careful study, the applicant finds that the functional failure of the water-soluble metal cutting fluid mainly comprises the following reasons: 1. the metal powder generated in the metal cutting process and the continuous accumulation of impurities such as external oil stain, dissolved mineral substances, dust and the like interact with the oil phase in the cutting fluid, so that the balance of all phases of the cutting fluid is lost, and the stability of the cutting fluid is reduced and the cutting fluid is deteriorated; 2. bacteria and other organic microorganisms are easily bred in the cutting fluid containing impurities, wherein anaerobic bacteria are taken as the main bacteria, so that the function of the antirust agent is further disabled; 3. moreover, the pH value of the cutting fluid is changed due to metabolites of anaerobic bacteria, so that effective components in the cutting fluid are degraded, and the cutting fluid is invalid.
The applicant designs a recyclable, purified and regenerated water-soluble cutting fluid which comprises the following components in parts by weight: 50-56 parts of naphthenic silicone oil, 5-7 parts of extreme pressure lubrication corrosion inhibitor, 10-12 parts of oily lubricating oil, 2-4 parts of antirust agent, 3-8 parts of alkaline retaining agent, 5-6 parts of span 80, 2-4 parts of fatty alcohol-polyoxyethylene ether, 4-6 parts of bactericide and 8-12 parts of deionized water.
Preferably, the extreme pressure lubricating corrosion inhibitor is prepared by mixing RHODAFACAS010, CPNF-3 or MDIT and HorltC101 according to the mass ratio of 1: 2-3: 0.3. The oily lubricant is pentaerythritol tetraoleate or trimethylolpropane oleate.
Preferably, the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate in a mass ratio of 1: (1-2), wherein the alkyl propane diamine derivative has the following structure:
Figure 805745DEST_PATH_IMAGE001
wherein R is a saturated alkyl chain or an unsaturated alkyl chain, and R' is-CH2CH2CH2NH2Or H.
The O-benzotriazole-N, N, N ', N' -tetramethyluronium tetrafluoroborate has the following structure:
Figure 38144DEST_PATH_IMAGE005
。
and (2) compounding the alkyl propane diamine derivative with O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate according to the mass ratio of 1: (1-2) compounding, and forming a layer of compact monomolecular adsorption film on the surface of the metal through the action of hydrogen bonds, so as to achieve the purpose of long-term rust prevention.
Preferably, the alkaline maintaining agent comprises at least one of monoethanolamine, triethanolamine, isopropanolamine, diglycolamine, 2-amino-2-methyl-1-propanol. Adding excessive alkaline maintaining agent to maintain the pH of the cutting fluid stable and slow down the change of the pH value of the cutting fluid; further prevents the effective components in the cutting fluid from being degraded and prevents the cutting fluid from losing efficacy.
In addition, most of the existing bactericides are metal working fluid bactericides BK, metal working fluid bactericides MBM, iodopropynyl n-butyl carbamate IPBC bactericides and other bactericides which are all broad-spectrum bactericides and have limited effect on anaerobic microorganisms, and a large amount of bactericides are used, so that the economic cost is greatly improved, and the bactericide is not friendly to human bodies, such as the situation that operation workers with sensitive physique can have allergy. Therefore, the applicant can improve the efficient bacteriostatic effect on anaerobic microorganisms by reacting the water-soluble low-molecular-weight chitosan with pyridine to generate the chitosan derivative.
The bactericide is synthesized by the following synthesis process: step 1, weighing a proper amount of micromolecular chitosan, adding the micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying; step 2, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine, stirring and reacting for 24-48 hours in a water bath at the temperature of 60-80 ℃, adding excessive diethyl ether to generate a large amount of precipitates, standing, performing suction filtration, washing the diethyl ether, and drying to obtain polypyridine acetyl-chitosan, wherein the structural formula of the polypyridine acetyl-chitosan is as follows:
Figure 544211DEST_PATH_IMAGE003
；
wherein n is 10 to 50.
In the actual use process, though the invention adopts the principle of low chitosan with good water solubility after degradation, the modified polypyridine acetyl-chitosan has good bacteriostatic activity on anaerobic bacteria, but the water solubility is obviously reduced. Further improvements are therefore desirable. Applicants have optimized the synthetic process by acylating low chitosan to obtain N-trimethyl chitosan ammonium chloride, and then modifying the N-trimethyl chitosan ammonium chloride to improve its water solubility.
The bactericide is synthesized by the following synthesis process: step 1, adding micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, then adding methyl bromide, sodium bromide and 20wt% of potassium hydroxide solution, uniformly stirring, and stirring and reacting for 1-2 hours in a water bath condition at the temperature of 60-80 ℃; after the reaction, adding excessive ether, generating powdery precipitate, centrifuging and washing to obtain white powder. Step 2, adding the white powder into an N-methyl-2-pyrrolidone solvent, and repeating the step 1-3 times to obtain high-purity white powder; step 3, weighing the white powder, adding the white powder into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying; and 4, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine, stirring and reacting for 24-48 h in a water bath condition at the temperature of 60-80 ℃, adding excessive ether to generate a large amount of precipitate, standing, performing suction filtration, washing with ether, and drying. Obtaining the polypyridine acetyl-N-trimethyl chitosan, wherein the structural formula of the polypyridine acetyl-N-trimethyl chitosan is as follows:
Figure 963691DEST_PATH_IMAGE006
；
wherein n is 10 to 50.
And finally, in the recycling process of the water-soluble cutting fluid, carrying out modified activated carbon adsorption treatment on the water-soluble cutting fluid. Because of the potential difference between the metal filings and the activated carbon, the microelectrode reaction on the activated carbon can be realized, taking the iron filings as an example, the microelectrode reaction is as follows:
anode:
Figure 580617DEST_PATH_IMAGE007
；
Figure 667522DEST_PATH_IMAGE008
cathode:
Figure 344491DEST_PATH_IMAGE009
under the alkaline condition, ferric hydroxide or ferrous hydroxide floccule can be generated and finally trapped and adsorbed by the active carbon. The interaction between the metal powder and the cutting fluid is avoided, and the problems of unbalance and deterioration of each phase of the cutting fluid are further avoided.
Preferably, the synthesis process of the modified activated carbon adsorption comprises the following steps: weighing a proper amount of commercially available activated carbon, cleaning with deionized water, and drying; and then adding the cobalt-loaded modified activated carbon into a cobalt nitrate solution, mechanically stirring for 0.5-1 h, filtering, washing with deionized water, putting the cobalt-loaded activated carbon into an oven, activating for 4-6 h at 200-220 ℃, and cooling to obtain the cobalt-loaded modified activated carbon. If the common activated carbon can be doped with cobalt ions, the capture capacity and adsorption efficiency of the common activated carbon on metal ions in wastewater can be enhanced.
The invention will now be further described with reference to the following examples, which are intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example 1
A water-soluble cutting fluid capable of being recycled, purified and regenerated comprises the following components in parts by weight: 56 parts of naphthenic silicone oil, 7 parts of extreme pressure lubrication corrosion inhibitor, 12 parts of pentaerythritol tetraoleate, 4 parts of antirust agent, 8 parts of triethanolamine, 6 parts of span 80, 4 parts of fatty alcohol-polyoxyethylene ether, 6 parts of bactericide and 12 parts of deionized water.
Wherein the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate in a mass ratio of 1: 1 in a composition. The extreme pressure lubricating corrosion inhibitor is prepared by mixing RHODAFACAS010, CPNF-3 or MDIT and HorltC101 according to the mass ratio of 1: 2. The bactericide is polypyridine acetyl-chitosan.
Based on the formula, the following preparation methods are mixed: mixing naphthenic silicone oil, extreme pressure lubricating corrosion inhibitor and lubricating oil into a reaction kettle, heating to 60 ℃, uniformly stirring, adding 1/3 deionized water, and continuously stirring; adding the antirust agent and the bactericide which are dissolved by ethanol in batches, and stirring for 45 min; then adding span 80 and fatty alcohol-polyoxyethylene ether into 1/3 deionized water, repeatedly dissolving, then adding into the reaction kettle in the step 1, and stirring for 60min at 50 ℃; finally, the rest deionized water and the alkaline maintaining agent are added and stirred until the solution becomes milky and translucent.
Example 2
A water-soluble cutting fluid capable of being recycled, purified and regenerated comprises the following components in parts by weight: 50 parts of naphthenic silicone oil, 5 parts of extreme pressure lubrication corrosion inhibitor, 10 parts of pentaerythritol tetraoleate, 2 parts of antirust agent, 3 parts of triethanolamine, 5 parts of span 80, 2 parts of fatty alcohol-polyoxyethylene ether, 4 parts of bactericide and 8 parts of deionized water.
Wherein the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate in a mass ratio of 1: 1 in a composition. The extreme pressure lubricating corrosion inhibitor is prepared by mixing RHODAFACAS010, CPNF-3 or MDIT and HorltC101 according to the mass ratio of 1: 2. The bactericide is polypyridine acetyl-N-trimethyl chitosan.
Based on the formula, the following preparation methods are mixed: mixing naphthenic silicone oil, extreme pressure lubricating corrosion inhibitor and lubricating oil into a reaction kettle, heating to 80 ℃, uniformly stirring, adding 1/3 deionized water, and continuously stirring; adding the antirust agent and the bactericide which are dissolved by ethanol in batches, and stirring for 30 min; then adding span 80 and fatty alcohol-polyoxyethylene ether into 1/3 deionized water, repeatedly dissolving, then adding into the reaction kettle in the step 1, and stirring for 100min at 60 ℃; finally, the rest deionized water and the alkaline maintaining agent are added and stirred until the solution becomes milky and translucent.
Example 3
A water-soluble cutting fluid capable of being recycled, purified and regenerated comprises the following components in parts by weight: 52 parts of naphthenic silicone oil, 6 parts of extreme pressure lubrication corrosion inhibitor, 10 parts of pentaerythritol tetraoleate, 3 parts of antirust agent, 5 parts of triethanolamine, 5 parts of span 80, 3 parts of fatty alcohol-polyoxyethylene ether, 5 parts of bactericide and 10 parts of deionized water.
Wherein the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethylurea tetrafluoroborate in a mass ratio of 1: 1 in a composition. The extreme pressure lubricating corrosion inhibitor is prepared by mixing RHODAFACAS010, CPNF-3 or MDIT and HorltC101 according to the mass ratio of 1: 2. The bactericide is polypyridine acetyl-N-trimethyl chitosan.
Based on the formula, the following preparation methods are mixed: mixing naphthenic silicone oil, extreme pressure lubricating corrosion inhibitor and lubricating oil into a reaction kettle, heating to 65 ℃, uniformly stirring, adding 1/3 deionized water, and continuously stirring; adding the antirust agent and the bactericide which are dissolved by ethanol in batches, and stirring for 45 min; then adding span 80 and fatty alcohol-polyoxyethylene ether into 1/3 deionized water, repeatedly dissolving, then adding into the reaction kettle in the step 1, and stirring for 80min at 55 ℃; finally, the rest deionized water and the alkaline maintaining agent are added and stirred until the solution becomes milky and translucent.
The cutting fluid prepared in the embodiments 1-3 meets the JB/T7453 standard, has excellent lubricating and corrosion inhibiting performance, and meets the performance requirements of the cutting fluid on lubricating, cooling and antirust effects. As shown in figure 1, the cutting fluid of the invention is still milk white after being recycled for 180 days, and the phenomenon of blackening does not occur.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

Claims (9)

1. The water-soluble cutting fluid capable of being recycled, purified and regenerated is characterized by comprising the following components in parts by weight:
50-56 parts of cycloalkyl silicone oil;
5-7 parts of an extreme pressure lubrication corrosion inhibitor;
10-12 parts of oily lubricating oil;
2-4 parts of an antirust agent;
3-8 parts of an alkaline retention agent;
805-6 parts of span;
2-4 parts of fatty alcohol-polyoxyethylene ether;
4-6 parts of a bactericide;
8-12 parts of deionized water.
2. The water-soluble cutting fluid capable of being recycled, purified and regenerated according to claim 1, wherein the antirust agent is an alkyl propane diamine derivative and O-benzotriazole-N, N, N ', N' -tetramethyluronium tetrafluoroborate in a mass ratio of 1: (1-2), wherein the alkyl propane diamine derivative has a structural formula as follows:
Figure 925355DEST_PATH_IMAGE001
wherein R is a saturated alkyl chain or an unsaturated alkyl chain, and R' is-CH 2CH2CH2NH2 or H;
the structural formula of the O-benzotriazole-N, N, N ', N' -tetramethyluronium tetrafluoroborate is as follows:
Figure 80393DEST_PATH_IMAGE002
。
3. the recyclable, purified and regenerated water-soluble cutting fluid as claimed in claim 1, wherein the alkaline maintaining agent comprises at least one of monoethanolamine, triethanolamine, isopropanolamine, diglycolamine, 2-amino-2-methyl-1-propanol.
4. The recyclable, purified and regenerated water-soluble cutting fluid as claimed in claim 1, wherein the bactericide is polypyridineacetyl chitosan or polypyridineacetyl-N-trimethyl chitosan, and the structural formula is as follows:
Figure 287383DEST_PATH_IMAGE003
or
Figure 135253DEST_PATH_IMAGE004
；
Wherein n is 10 to 50.
5. The recyclable, purified and regenerated water-soluble cutting fluid as claimed in claim 4, wherein the polypyridine acetyl-chitosan is synthesized by the following process:
step 1, weighing a proper amount of micromolecular chitosan, adding the micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying;
and 2, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine, stirring in a water bath at the temperature of 60-80 ℃ for reaction for 24-48 h, adding excessive diethyl ether to generate a large amount of precipitate, standing, performing suction filtration, washing with diethyl ether, and drying.
6. The recyclable, purified and regenerated water-soluble cutting fluid as claimed in claim 4, wherein the polypyridineacetyl-N-trimethyl chitosan is synthesized by the following process:
step 1, adding micromolecular chitosan into an N-methyl-2-pyrrolidone solvent, then adding methyl bromide, sodium bromide and 20wt% of potassium hydroxide solution, uniformly stirring, and stirring and reacting for 1-2 hours in a water bath condition at the temperature of 60-80 ℃; after the reaction is finished, adding excessive diethyl ether, generating powdery precipitate, centrifuging and washing to obtain white powder;
step 2, adding the white powder into an N-methyl-2-pyrrolidone solvent, and repeating the step 1-3 times to obtain high-purity white powder;
step 3, weighing the white powder, adding the white powder into an N-methyl-2-pyrrolidone solvent, uniformly stirring, then dripping benzoyl chloride with the molar mass of 2-3 times, continuously stirring at room temperature for reacting for 24-48 hours, adding excessive butanone, generating powdery precipitate, standing, performing suction filtration, washing with butanone, and drying;
and 4, weighing the solid powder, dissolving the solid powder in a dimethyl sulfoxide solvent, adding pyridine, stirring and reacting for 24-48 h in a water bath condition at the temperature of 60-80 ℃, adding excessive ether to generate a large amount of precipitate, standing, performing suction filtration, washing with ether, and drying.
7. A preparation method of water-soluble cutting fluid capable of being recycled, purified and regenerated is characterized by comprising the following steps:
step 1, mixing naphthenic silicone oil, an extreme pressure lubrication corrosion inhibitor and lubricating oil into a reaction kettle, heating to 60-80 ℃, uniformly stirring, adding 1/3 deionized water, and continuously stirring; adding the antirust agent and the bactericide which are dissolved by ethanol in batches, and stirring for 30-45 min;
step 2, adding span 80 and fatty alcohol-polyoxyethylene ether into 1/3 deionized water, repeatedly dissolving, then adding into the reaction kettle in the step 1, and stirring for 60-100 min at 50-60 ℃;
and 3, finally adding the rest deionized water and the alkaline maintaining agent, and stirring until the solution becomes milky and semitransparent.
8. The application of the recyclable, purified and regenerated water-soluble cutting fluid in the cutting process is characterized in that the water-soluble cutting fluid needs to be subjected to modified activated carbon adsorption treatment after being recycled.
9. The application of the recyclable, purified and regenerated water-soluble cutting fluid in the cutting process as claimed in claim 8, wherein the synthesis process of modified activated carbon adsorption comprises the following steps: weighing a proper amount of commercially available activated carbon, cleaning with deionized water, and drying; and then adding the cobalt-loaded modified activated carbon into a cobalt nitrate solution, mechanically stirring for 0.5-1 h, filtering, washing with deionized water, putting the cobalt-loaded activated carbon into an oven, activating for 4-6 h at 200-220 ℃, and cooling to obtain the cobalt-loaded modified activated carbon.
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Cited By (2)

* Cited by examiner, † Cited by third party
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CN115595200A (en) * 2022-10-09 2023-01-13 安徽韩铝环保新材料有限公司（Cn） Metal lubricating cutting fluid and preparation method thereof
CN117143656A (en) * 2023-08-09 2023-12-01 河南减碳科技有限公司 Biological stable lubricating oil based on waste transformer oil and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115595200A (en) * 2022-10-09 2023-01-13 安徽韩铝环保新材料有限公司（Cn） Metal lubricating cutting fluid and preparation method thereof
CN115595200B (en) * 2022-10-09 2023-10-03 安徽韩铝环保新材料有限公司 Metal lubrication cutting fluid and preparation method thereof
CN117143656A (en) * 2023-08-09 2023-12-01 河南减碳科技有限公司 Biological stable lubricating oil based on waste transformer oil and preparation method thereof
CN117143656B (en) * 2023-08-09 2024-03-26 河南减碳科技有限公司 Biological stable lubricating oil based on waste transformer oil and preparation method thereof

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