Microorganism-resistant rolling liquid and preparation method thereof

Abstract

The invention provides microorganism-resistant rolling liquid and a preparation method thereof. The microorganism-resistant rolling liquid comprises the following components: modified multi-component synthetic ester, mineral oil, an antioxidant, an emulsifier and an anti-wear agent, the modified polybasic synthetic ester is prepared by a preparation method comprising the following steps: (1) mixing polyhydric alcohol, tall oil acid, a Lewis acid catalyst and a water-carrying agent, and reacting; centrifuging, washing and distilling to obtain tall oil acid polyol ester; (2) mixing tall oleic acid polyol ester, organic carboxylic acid, a Lewis acid catalyst and a water-carrying agent, and reacting; and centrifuging, washing and distilling to obtain the modified multi-component synthetic ester. The rolling liquid disclosed by the invention can be used for effectively inhibiting microorganism breeding while ensuring the lubricity, improving the annealing detergency of a plate surface, increasing the reflectivity of the plate surface and improving the quality of the plate surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of rolling processes, and particularly relates to a microbiostatic rolling fluid and a preparation method thereof. Background Art

[0002] In the system of rolling fluid, the necessary conditions for the reproduction of microorganisms such as temperature and nutrients are available. The reproduction of a large number of microorganisms will not only cause the rolling fluid to rot and stink, but also the viscous fluid secreted by microorganisms will bond with inorganic salts, impurities, corrosion products, oil stains, dead bacteria, etc. in the rolling fluid to form a slime-like sediment, resulting in the rolling fluid becoming thick and sticky, adhering to the system pipes and filters, blocking the pipelines and nozzles, thus affecting the lubricating performance of the rolling fluid and causing problems with the surface defects of the rolled plate.

[0003] For rolling fluids that are not in operation and have a long downtime, it is necessary to circulate regularly, stir, introduce air, add bactericides or replenish additives, etc. to prevent the large-scale reproduction of microorganisms in the rolling fluid. The most commonly used method in the prior art is to add bactericides, use functional groups with rare metals or add antioxidants to delay the aging rate of the rolling fluid to slow down the spoilage and deterioration of the rolling fluid. However, the bactericide will cause a change in the pH of the rolling fluid, thereby affecting the performance of the rolling fluid, and it contains biological toxicity and is not friendly to the environment.

[0004] CN106010747A discloses an antioxidant and antibacterial aluminum foil rolling oil. By adding a green and environmentally friendly antioxidant, the rolling oil will not age rapidly during the processing, and the service life of the rolling oil is extended. However, compared with other components, the content of the antioxidant is less than that of the base oil. When the antioxidant is consumed by bacteria, spoilage and deterioration will still occur.

[0005] CN109337738A discloses an aqueous rolling fluid containing nano silver, which will not go rancid and deteriorate for a long period, but the introduction of precious metals will also increase the raw material cost.

[0006] Based on this, it is necessary to develop a low-cost microbiostatic rolling fluid that can not only ensure the lubricating performance but also slow down the spoilage rate. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a microbiostatic rolling fluid and a preparation method thereof. The microbiostatic rolling fluid provided by the present invention can effectively inhibit the reproduction of microorganisms, slow down the spoilage rate, and at the same time ensure the lubricating performance of the rolling fluid, increase the surface reflectivity, and improve the surface quality of the plate.

[0008] To achieve the purpose of this invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a microbiotolerant rolling fluid, and the components of the microbiotolerant rolling fluid include a modified polyol ester, a mineral oil, an antioxidant, an emulsifier, and an antiwear agent;

[0010] The modified polyol ester is prepared by a preparation method including the following steps:

[0011] (1) Mix a polyol, tall oil fatty acid, a Lewis acid catalyst, and a water-carrying agent, and carry out a reaction; centrifuge, wash, and distill to obtain a tall oil fatty acid polyol ester;

[0012] (2) Mix the tall oil fatty acid polyol ester, an organic carboxylic acid, a Lewis acid catalyst, and a water-carrying agent, and carry out a reaction; centrifuge, wash, and distill to obtain the modified polyol ester.

[0013] The present invention uses tall oil fatty acid to prepare a tall oil fatty acid polyol ester, and then extends the chain with an organic carboxylic acid to prepare a modified polyol ester, making up for the insufficient lubrication of the polyol ester. Using the modified polyol ester to replace the natural ester in the traditional rolling fluid has the advantage of being not easily hydrolyzed, can effectively inhibit the reproduction of microorganisms, and slow down the spoilage rate of the rolling fluid; using the modified polyol ester as the base oil can effectively improve the annealing cleanliness of the plate surface, with fewer impurities, while ensuring the lubricity of the rolling oil, increasing the reflectivity of the plate surface, and improving the plate surface quality.

[0014] In the present invention, the acid value of the tall oil fatty acid is 150 - 180 mg KOH / g, the acid value of the modified polyol ester prepared therefrom is 0.2 - 1 mg KOH / g, the saponification value is 170 - 180 mg KOH / g, the kinematic viscosity at 40 °C is 85 - 90 mm 2 / s, and the kinematic viscosity at 100 °C is 10 - 15 mm 2 / s.

[0015] Preferably, the components of the microbiotolerant rolling fluid include 65 - 90 parts by weight of the modified polyol ester, 0.01 - 20 parts by weight of the mineral oil, 0.5 - 1 part by weight of the antioxidant, 0.5 - 3 parts by weight of the emulsifier, and 1 - 3 parts by weight of the antiwear agent.

[0016] The weight parts of the modified polyol ester can be 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, 82 parts, 85 parts, 88 parts, 90 parts, etc.

[0017] The weight parts of the mineral oil can be 0.01 part, 1 part, 2 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, etc.

[0018] The weight parts of the antioxidant can be 0.5 part, 0.55 part, 0.6 part, 0.65 part, 0.7 part, 0.75 part, 0.8 part, 0.85 part, 0.9 part, 0.95 part, 1 part, etc.

[0019] The weight parts of the emulsifier can be 0.5 part, 0.8 part, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.5 parts, 2.8 parts, 3 parts, etc.

[0020] The weight parts of the antiwear agent can be 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, etc.

[0021] Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.

[0022] Preferably, the polyol includes any one or a combination of at least two of neopentyl glycol, 1,3 - butanediol, 1,2 - pentanediol, or dipropylene glycol.

[0023] When preparing the modified polyol synthetic ester of the present invention, compared with other polyols, neopentyl glycol has a more significant effect in inhibiting the reproduction of microorganisms and improving the reflectivity of the rolled plate surface.

[0024] Preferably, the polyol includes a combination of neopentyl glycol and at least one of 1,3 - butanediol, 1,2 - pentanediol, or dipropylene glycol.

[0025] When preparing the modified polyol synthetic ester of the present invention, neopentyl glycol is used in combination with other polyols, and has a synergistic effect in inhibiting the reproduction of microorganisms and improving the reflectivity of the rolled plate surface.

[0026] Furthermore, the molar ratio of the hydroxyl groups of neopentyl glycol to those of other polyols is (0.01 - 0.05):(0.01 - 0.05).

[0027] The specific point values in the first (0.01 - 0.05) can be 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, etc.; the specific point values in the second (0.01 - 0.05) can be 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, etc.

[0028] Preferably, the organic carboxylic acid includes monobasic organic carboxylic acid and / or dibasic organic carboxylic acid.

[0029] In the present invention, an organic carboxylic acid is used to chain-extend the tall oil fatty acid polyol ester to make up for the deficiency of its lubricating performance. The more carbon atoms the organic carboxylic acid has, the longer the chain extension is and the better the lubricity is.

[0030] Preferably, in step (1), the molar ratio of the hydroxyl group in the polyol to the carboxyl group in the tall oil fatty acid is (0.5 - 2):(0.5 - 2).

[0031] The specific point values in the first (0.5 - 2) can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.; the specific point values in the second (0.5 - 2) can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

[0032] Preferably, in step (2), the molar ratio of the hydroxyl group in the tall oil fatty acid polyol ester to the carboxyl group in the organic carboxylic acid is (5 - 7):(3 - 5).

[0033] The specific point values in (5 - 7) can be 5, 5.2, 5.4, 5.6, 5.8, 6, 6.2, 6.4, 6.6, 6.8, 7, etc.; the specific point values in (3 - 5) can be 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, etc.

[0034] Other specific point values within the ranges of the above items can be selected and will not be elaborated one by one here.

[0035] Preferably, the mixing method is stirring.

[0036] Preferably, the distillation is vacuum distillation.

[0037] Preferably, the water-carrying agents in step (1) and step (2) are each independently selected from any one or a combination of at least two of toluene, cyclohexane or xylene.

[0038] In the present invention, the water-carrying agent is used to timely carry the water generated by the esterification reaction out of the reaction system.

[0039] Preferably, the Lewis acid catalysts in step (1) and step (2) are each independently selected from any one or a combination of at least two of stannous oxide, tin tetrachloride, zinc chloride, ferric trichloride or aluminum trichloride.

[0040] Preferably, the temperature of the reactions in steps (1) and (2) is independently 150 - 170°C, for example, it can be 150°C, 152°C, 155°C, 158°C, 160°C, 162°C, 165°C, 168°C, 170°C, etc.; the reaction time is independently 2 - 5 h, for example, it can be 2 h, 2.2 h, 2.5 h, 2.8 h, 3 h, 3.2 h, 3.5 h, 3.8 h, 4 h, 4.2 h, 4.5 h, 4.8 h, 5 h, etc.

[0041] Preferably, the mass percentage content of the Lewis acid catalyst in the reaction systems of steps (1) and (2) is independently 0.05 - 10%, for example, it can be 0.05%, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 2%, 4%, 6%, 8%, 10%, etc.

[0042] Preferably, the mass percentage content of the water-carrying agent in the reaction systems of steps (1) and (2) is independently 3 - 30%, for example, it can be 3%, 5%, 7%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 27%, 30%, etc.

[0043] Preferably, the mineral oil includes naphthenic oil with a viscosity of 20 - 40 cSt at 40°C, for example, it can be 20 cSt, 22 cSt, 25 cSt, 28 cSt, 30 cSt, 32 cSt, 35 cSt, 38 cSt, 40 cSt, etc.

[0044] Other specific point values within the above numerical ranges can be selected and will not be elaborated one by one here.

[0045] Preferably, the antioxidant includes arylamine antioxidants and / or phenolic amine antioxidants.

[0046] In the antioxidant of the present invention, the arylamine antioxidant and the phenolic amine antioxidant have a synergistic effect, and their synergistic use has a more significant effect in inhibiting the reproduction of microorganisms and improving the reflectivity of the rolled plate surface.

[0047] Preferably, the emulsifier includes any one or a combination of at least two of polyoxyethylene alkylamine, fatty alcohol polyoxyethylene ether, or high-molecular polyether type emulsifiers.

[0048] Preferably, the emulsifier includes a combination of polyoxyethylene alkylamine and fatty alcohol polyoxyethylene ether.

[0049] In the emulsifier of the present invention, polyoxyethylene alkylamine and fatty alcohol polyoxyethylene ether have a synergistic effect, and their synergistic use has a more significant effect in inhibiting the reproduction of microorganisms and improving the reflectivity of the rolled plate surface.

[0050] Preferably, the anti-wear agent includes any one or a combination of at least two of sulfurized hydrocarbon anti-wear agents, phosphate esters, amine salts of phosphate esters, thiophosphate esters or amine salts of thiophosphate esters.

[0051] In a second aspect, the present invention provides a method for preparing the microbial-resistant rolling fluid as described in the first aspect. The preparation method includes: mixing a modified polyol ester, a mineral oil, an antioxidant, an emulsifier and an anti-wear agent to obtain the microbial-resistant rolling fluid.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The present invention uses a modified polyol ester to replace the natural ester in the traditional rolling fluid, which has the advantage of being not easily hydrolyzed, can effectively inhibit the reproduction of microorganisms, and slow down the spoilage rate of the rolling fluid; using the modified polyol ester as the base oil can effectively improve the annealing cleanliness of the plate surface, with less impurities, while ensuring the lubricity of the rolling oil, increasing the reflectivity of the plate surface, and improving the plate surface quality. Specific Embodiments

[0054] To further elaborate on the technical means and effects adopted by the present invention, the following further illustrates the technical solutions of the present invention in combination with the preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0055] For those not specifying specific techniques or conditions in the embodiments, they shall be in accordance with the techniques or conditions described in the literature in this field or in accordance with the product specifications. For reagents or instruments not indicating the manufacturer, they are all conventional products that can be obtained through regular channels.

[0056] Preparation Example 1

[0057] This preparation example provides a modified polyol ester, which is prepared by a preparation method including the following steps:

[0058] (1) Mix 1.04 g of neopentyl glycol, 7.02 g of tall oil fatty acid, 10 mg of stannous oxide and 0.5 mL of toluene, and stir and react at 160 °C for 3 h. Among them, the molar ratio of the hydroxyl group in neopentyl glycol to the carboxyl group in tall oil fatty acid is 1:1; centrifuge to remove the catalyst, wash with water to remove the unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain the tall oil fatty acid polyol ester;

[0059] (2) Mix 24.49 g of tall oil fatty acid polyol ester, 5.85 g of adipic acid, 30 mg of stannous oxide and 1.5 mL of toluene, and stir and react at 160 °C for 3 h. Among them, the molar ratio of the hydroxyl group in the tall oil fatty acid polyol ester to the carboxyl group in adipic acid is 6:4; centrifuge to remove the catalyst, wash with water to remove the unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain the modified polyol ester, and its structure is as follows:

[0060]

[0061] Production Example 2

[0062] This production example provides a modified polyol ester, which is obtained by a production method including the following steps:

[0063] (1) Mix 0.45 g of 1,3-butanediol, 7.02 g of tall oil fatty acid, 10 mg of tin tetrachloride with 0.5 mL of cyclohexane, and stir and react at 150 °C for 5 h. Among them, the molar ratio of the hydroxyl group in 1,3-butanediol to the carboxyl group in tall oil fatty acid is 1:2; centrifuge to remove the catalyst, wash with water to remove unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain tall oil fatty acid polyol ester;

[0064] (2) Mix 27.59 g of tall oil fatty acid polyol ester, 5.2 g of malonic acid, 30 mg of tin tetrachloride with 1.5 mL of cyclohexane, and stir and react at 150 °C for 5 h. Among them, the molar ratio of the hydroxyl group in tall oil fatty acid polyol ester to the carboxyl group in malonic acid is 7:5; centrifuge to remove the catalyst, wash with water to remove unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain the modified polyol ester, and its structure is as follows:

[0065]

[0066] Production Example 3

[0067] This production example provides a modified polyol ester, which is obtained by a production method including the following steps:

[0068] (1) Mix 2.08 g of 1,2-pentanediol, 7.02 g of tall oil fatty acid, 10 mg of zinc chloride with 0.5 mL of xylene, and stir and react at 170 °C for 2 h. Among them, the molar ratio of the hydroxyl group in 1,2-pentanediol to the carboxyl group in tall oil fatty acid is 1:0.5; centrifuge to remove the catalyst, wash with water to remove unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain tall oil fatty acid polyol ester;

[0069] (2) Mix 20.41 g of tall oil fatty acid polyol ester, 3.54 g of succinic acid, 30 mg of zinc chloride with 1.5 mL of xylene, and stir and react at 170 °C for 2 h. Among them, the molar ratio of the hydroxyl group in tall oil fatty acid polyol ester to the carboxyl group in succinic acid is 5:3; centrifuge to remove the catalyst, wash with water to remove unreacted raw materials, and then remove the water-carrying agent by vacuum distillation to obtain the modified polyol ester, and its structure is as follows:

[0070]

[0071] Production Example 4

[0072] This Preparation Example provides a modified polyol ester, which is different from Preparation Example 1 only in that: "1.04 g of neopentyl glycol" is replaced with "0.52 g of neopentyl glycol and 0.45 g of 1,3-butanediol", wherein the molar ratio of the hydroxyl groups in neopentyl glycol and 1,3-butanediol to the carboxyl groups in tall oil fatty acid is 1:1, and other raw materials and steps remain unchanged.

[0073] Preparation Example 5

[0074] This Preparation Example provides a modified polyol ester, which is different from Preparation Example 1 only in that: "1.04 g of neopentyl glycol" is replaced with "0.52 g of neopentyl glycol and 0.52 g of 1,2-pentanediol", wherein the molar ratio of the hydroxyl groups in neopentyl glycol and 1,2-pentanediol to the carboxyl groups in tall oil fatty acid is 1:1, and other raw materials and steps remain unchanged.

[0075] Preparation Example 6

[0076] This Preparation Example provides a modified polyol ester, which is different from Preparation Example 1 only in that: "1.04 g of neopentyl glycol" is replaced with "0.45 g of 1,3-butanediol and 0.52 g of 1,2-pentanediol", wherein the molar ratio of the hydroxyl groups in 1,3-butanediol and 1,2-pentanediol to the carboxyl groups in tall oil fatty acid is 1:1, and other raw materials and steps remain unchanged.

[0077] Preparation Example 7

[0078] This Preparation Example provides a modified polyol ester, which is different from Preparation Example 1 only in that: "1.04 g of neopentyl glycol" is replaced with "0.42 g of neopentyl glycol, 0.27 g of 1,3-butanediol and 0.31 g of 1,2-pentanediol", wherein the molar ratio of the hydroxyl groups in neopentyl glycol, 1,3-butanediol and 1,2-pentanediol to the carboxyl groups in tall oil fatty acid is 1:1, and other raw materials and steps remain unchanged.

[0079] Comparative Preparation Example 1

[0080] This Comparative Preparation Example provides a tall oil fatty acid polyol ester, which is different from Preparation Example 1 only in that: there is no step (2), and other raw materials and steps remain unchanged.

[0081] Comparative Preparation Example 2

[0082] This Comparative Preparation Example provides a modified polyol ester, which is different from Preparation Example 1 only in that: "7.02 g of tall oil fatty acid" is replaced with "5.97 g of castor oil fatty acid", wherein the molar ratio of the hydroxyl groups in neopentyl glycol to the carboxyl groups in castor oil fatty acid is 1:1, and other raw materials and steps remain unchanged.

[0083] Example 1

[0084] This embodiment provides a microbial-resistant rolling fluid, which includes the following components in parts by weight:

[0085]

[0086] The preparation method is to mix the above raw materials evenly.

[0087] Example 2

[0088] This embodiment provides a microbial-resistant rolling fluid, which includes the following components in parts by weight:

[0089]

[0090] The preparation method is to mix the above raw materials evenly.

[0091] Example 3

[0092] This embodiment provides a microbial-resistant rolling fluid, which includes the following components in parts by weight:

[0093]

[0094]

[0095] The preparation method is to mix the above raw materials evenly.

[0096] Examples 4 - 7

[0097] This embodiment provides a microbial-resistant rolling fluid, which is only different from Example 1 in that "the modified polyol synthetic ester of Preparation Example 1" is replaced with an equal amount of "the modified polyol synthetic ester of Preparation Examples 4 - 7", and other raw materials and steps remain unchanged.

[0098] Example 8

[0099] This embodiment provides a microbial-resistant rolling fluid, which is only different from Example 1 in that "2,6 - di-tert-butyl-α-dimethylamino-p-cresol" is not added to the antioxidant, and its reduced amount is proportionally distributed to "dioctyl diphenylamine", and other raw materials and steps remain unchanged.

[0100] Example 9

[0101] This embodiment provides a microbial-resistant rolling fluid, which is only different from Example 1 in that "dioctyl diphenylamine" is not added to the antioxidant, and its reduced amount is proportionally distributed to "2,6 - di-tert-butyl-α-dimethylamino-p-cresol", and other raw materials and steps remain unchanged.

[0102] Example 10

[0103] This embodiment provides a microbiotolerant rolling fluid, which is only different from that of Embodiment 1 in that: "MOA-3" is not added to the emulsifier, and its reduced amount is proportionally distributed to "polyoxyethylene coconut amine", and other raw materials and steps remain unchanged.

[0104] Embodiment 11

[0105] This embodiment provides a microbiotolerant rolling fluid, which is only different from that of Embodiment 1 in that: "polyoxyethylene coconut amine" is not added to the emulsifier, and its reduced amount is proportionally distributed to "MOA-3", and other raw materials and steps remain unchanged.

[0106] Comparative Example 1

[0107] This comparative example provides a rolling fluid, which is only different from that of Embodiment 1 in that: "the modified polybasic synthetic ester of Preparation Example 1" is replaced with an equal amount of "the tall oil fatty acid polyol ester of Comparative Preparation Example 1", and other raw materials and steps remain unchanged.

[0108] Comparative Example 2

[0109] This comparative example provides a rolling fluid, which is only different from that of Embodiment 1 in that: "the modified polybasic synthetic ester of Preparation Example 1" is replaced with an equal amount of "the modified polybasic synthetic ester of Comparative Preparation Example 2", and other raw materials and steps remain unchanged.

[0110] Comparative Example 3

[0111] This comparative example provides a rolling fluid, which is only different from that of Embodiment 1 in that: "the modified polybasic synthetic ester of Preparation Example 1" is replaced with an equal amount of "rapeseed oil", and other raw materials and steps remain unchanged.

[0112] Test Example 1

[0113] In the production line of the steel mill, the rolling fluids of Embodiments 1-11 and Comparative Examples 1-3 are used. After a 2-week shutdown during the Spring Festival holiday, the microbial content in the rolling fluid is detected with 3M Petrifilm total bacterial count test strips, and the reflectivity of the rolled plate surface after restarting is detected with the C84-III reflectometer of Shanghai Modern Environmental Engineering Co., Ltd. The test results are shown in Table 1:

[0114] Table 1

[0115]

[0116]

[0117] The present invention uses a modified polybasic synthetic ester to replace the natural ester in the traditional rolling fluid, has the advantage of being not easily hydrolyzed, can effectively inhibit the reproduction of microorganisms, slow down the spoilage rate of the rolling fluid, increase the reflectivity of the rolled plate surface, and improve the plate surface quality.

[0118] The present invention creatively discovers that preparing tall oil fatty acid polyol ester from tall oil fatty acid and then chain-extending with organic carboxylic acid to prepare modified polyol synthetic ester can make up for the insufficient lubrication of polyol ester and improve the reflectivity of the rolled plate surface, and tall oil fatty acid has a better effect compared with other fatty acids.

[0119] When preparing the modified polyol synthetic ester of the present invention, neopentyl glycol has a more significant effect than other polyols in inhibiting the reproduction of microorganisms and improving the reflectivity of the rolled plate surface. Neopentyl glycol has a synergistic effect with other polyols; among the antioxidants, aromatic amine antioxidants and phenolic amine antioxidants have a synergistic effect, and among the emulsifiers, polyoxyethylene alkylamine and fatty alcohol polyoxyethylene ether have a synergistic effect.

[0120] The applicant declares that the present invention uses the above embodiments to illustrate a microbial-resistant rolling fluid and its preparation method of the present invention, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

[0121] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept scope of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0122] In addition, it should be noted that in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

Claims

1. A microorganism-resistant rolling fluid, characterized in that: The components of the microbial-resistant rolling fluid include modified polybasic synthetic ester, mineral oil, antioxidant, emulsifier and anti-wear agent; The modified polybasic synthetic ester is prepared by a preparation method comprising the following steps: (1) mixing polyol, tall oil acid, Lewis acid catalyst and water-carrying agent, and reacting; centrifuging, washing, and distilling to obtain tall oil acid polyol ester; (2) mixing tall oil acid polyol ester, organic carboxylic acid, Lewis acid catalyst and water carrying agent to react; Centrifugation, washing and distillation are performed to obtain the modified polybasic synthetic ester.

2. The microorganism-resistant rolling fluid according to claim 1, characterized in that: The components of the microbial-resistant rolling fluid include, by weight, 65-90 parts of modified polybasic synthetic ester, 0.01-20 parts of mineral oil, 0.5-1 parts of antioxidant, 0.5-3 parts of emulsifier and 1-3 parts of anti-wear agent; Preferably, the polyol includes any one or a combination of at least two of neopentyl glycol, 1,3-butanediol, 1,2-pentanediol or dipropylene glycol; Preferably, the polyol comprises a combination of neopentyl glycol and at least one of 1,3-butanediol, 1,2-pentanediol or dipropylene glycol; Preferably, the organic carboxylic acid comprises a monobasic organic carboxylic acid and / or a dibasic organic carboxylic acid.

3. The microorganism-resistant rolling fluid according to claim 1 or 2, characterized in that: In step (1), the molar ratio of the hydroxyl group in the polyol to the carboxyl group in tall oil acid is (0.5-2):(0.5-2); Preferably, in step (2), the molar ratio of the hydroxyl group in the tall oil acid polyol ester to the carboxyl group in the organic carboxylic acid is (5-7):(3-5).

4. The microorganism-resistant rolling fluid according to claim 1, characterized in that: The mixing method is stirring; Preferably, the distillation is vacuum distillation; Preferably, the water-carrying agent in step (1) and step (2) is independently selected from any one or a combination of at least two of toluene, cyclohexane or xylene; Preferably, the Lewis acid catalysts in step (1) and step (2) are independently selected from any one or a combination of at least two of stannous oxide, tin tetrachloride, zinc chloride, ferric chloride or aluminum chloride.

5. The microorganism-resistant rolling fluid according to claim 1, characterized in that: The reaction temperature in step (1) and step (2) is independently 150-170° C., and the reaction time is independently 2-5 h. Preferably, the mass percentage of the Lewis acid catalyst in the reaction system of step (1) and step (2) is independently 0.05-10%; Preferably, the mass percentage of the water-carrying agent in the reaction system of step (1) and step (2) is independently 3-30%.

6. The microorganism-resistant rolling fluid according to any one of claims 1 to 5, characterized in that: The mineral oil includes a naphthenic oil having a viscosity of 20-40 cSt at 40°C.

7. The microorganism-resistant rolling fluid according to any one of claims 1 to 5, characterized in that: The antioxidant includes an aromatic amine antioxidant and / or a phenol amine antioxidant.

8. The microorganism-resistant rolling fluid according to any one of claims 1 to 5, characterized in that: The emulsifier includes any one or a combination of at least two of polyoxyethylene alkylamine, fatty alcohol polyoxyethylene ether or polymer polyether emulsifier; Preferably, the emulsifier comprises a combination of polyoxyethylene alkylamine and fatty alcohol polyoxyethylene ether.

9. The microorganism-resistant rolling fluid according to any one of claims 1 to 5, characterized in that: The anti-wear agent includes any one of sulfided hydrocarbon anti-wear agents, phosphate esters, phosphate ester amine salts, thiophosphate esters or thiophosphate amine salts, or a combination of at least two thereof.

10. The method for preparing a microorganism-resistant rolling fluid according to any one of claims 1 to 9, characterized in that: The preparation method comprises: mixing modified polybasic synthetic ester, mineral oil, antioxidant, emulsifier and anti-wear agent to obtain the microbial-resistant rolling fluid.

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