A food-grade bearing grease composition for hydraulic engineering, its preparation method and application

Abstract

The application relates to the technical field of lubricating grease, and provides a food-grade bearing lubricating grease composition for water conservancy projects, a preparation method and application. The lubricating grease composition comprises base oil, thickening agent and structure improving agent. The base oil contains food-grade ether oil and / or food-grade ester oil; the thickening agent is food-grade sepiolite; when the base oil contains food-grade ether oil, the structure improving agent comprises polyester and / or polyester derivative; and / or when the base oil contains food-grade ester oil, the structure improving agent comprises polyether and / or polyether derivative. The food-grade sepiolite is used as the thickening agent, and specific base oil is added, so that a lubricating grease composition with excellent high and low temperature applicability, extreme pressure performance, water resistance, mechanical stability and rust prevention performance which meets the working condition requirements of large water conservancy projects under large load is obtained. The lubricating grease composition meets the food-grade requirement, can be used for lubrication and protection of bearings of large water conservancy project equipment, and will not pollute water bodies.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lubricating grease, in particular to a water conservancy project food-grade bearing grease composition, a preparation method and application thereof. BACKGROUND

[0002] At present, the bearing of the equipment in the water conservancy project uses industrial-grade lubricating grease, which contains heavy metals and carcinogens. The lubricating grease in the bearing is mostly added by manual smearing, and the excess grease will fall into the water during the work process, causing local and downstream water environmental pollution, which is harmful to the life and industrial and agricultural production of the downstream residents, and does not meet the requirements of relevant regulations and the national sustainable development strategy. In patent application CN107686763A, a composite aluminum soap thickened food-grade mineral oil or synthetic oil is used to prepare a water conservancy project food-grade bearing grease with a use temperature of-40-80℃. The winter use temperature cannot meet the extremely low temperature climate in northern China, and the summer is directly exposed to sunlight, which has a risk of dripping, resulting in lubrication failure. The extreme pressure performance PD value is not more than 200kg, which cannot meet the working condition requirements of larger load of large water conservancy project gate machines. In addition, the composite aluminum soap grease usually uses isopropyl alcohol aluminum as the aluminum source, which will discharge isopropyl alcohol during the conversion process, and direct discharge will cause environmental pollution.

[0003] In view of this, the present application is proposed. SUMMARY

[0004] The present application provides a water conservancy project food-grade bearing grease composition, a preparation method and application thereof, to solve the defects of the existing technology, such as narrow use temperature, insufficient extreme pressure performance and potential environmental pollution risk of the lubricating grease used in the water conservancy project. By adding a specific base oil with food-grade sepiolite as a thickening agent and combining a specific structure improver, a lubricating grease composition with excellent high and low temperature applicability, extreme pressure performance meeting the working condition requirements of large water conservancy projects with large load, water resistance, mechanical stability and rust prevention performance is realized. It meets the food-grade requirements and can be used for lubrication and protection of the bearings of large water conservancy hub project equipment, without polluting the water body.

[0005] Specifically, the present application provides a water conservancy project food-grade bearing grease composition, which comprises a base oil, a thickening agent and a structure improver, the base oil contains food-grade ether oil and / or food-grade ester oil; the thickening agent mainly comprises food-grade sepiolite;

[0006] When the base oil contains food-grade ether oil, the structure improver comprises polyester and / or polyester derivative; and / or, when the base oil contains food-grade ester oil, the structure improver comprises polyether and / or polyether derivative, and meets the HX-1 approval requirements or FDA specifications.

[0007] Specifically, when the base oil is a food-grade ether oil or a food-grade synthetic oil containing a food-grade ether oil, the structure improving agent comprises a polyester and / or a polyester derivative, and meets the HX-1 approval requirement or the FDA specification;

[0008] When the base oil is a food-grade ester oil or a food-grade synthetic oil containing a food-grade ester oil, the structure improving agent comprises a polyether and / or a polyether derivative, and meets the HX-1 approval requirement or the FDA specification.

[0009] When the base oil contains a food-grade ether oil and a food-grade ester oil, the structure improving agent can be a polyester and / or a polyether.

[0010] Preferably, the base oil contains a food-grade ether oil and a food-grade ester oil.

[0011] Further preferably, the thickening agent is composed of only a food-grade sepiolite.

[0012] It is found in experiments that, when the grease system using sepiolite as a thickening agent is modified by using a polyester and its derivative or a polyether and its derivative, the amount of the polyester and its derivative or the polyether and its derivative is relatively high, and it is difficult to optimize the performance of the grease system. However, by using the base oil and the structure improving agent in combination as described above, the stability of the obtained grease composition is better, the difference between the extended cone penetration and the cone penetration is smaller, the grease composition can be used for lubrication and protection of bearings of large-scale water conservancy project equipment, and the water body is not polluted.

[0013] According to the water conservancy project food-grade bearing grease composition provided by the application, the mass ratio of the base oil to the food-grade sepiolite is 55-90:5-40.

[0014] According to the water conservancy project food-grade bearing grease composition provided by the application, the addition amount of the structure improving agent is 0.5-30% by mass percentage, based on the total amount of the base oil and the thickening agent.

[0015] According to the water conservancy project food-grade bearing grease composition provided by the application, the viscosity of the base oil at 100℃ is 1-200mm 2 / s, which has better viscosity-temperature characteristics than common base oils.

[0016] According to the water conservancy project food-grade bearing grease composition provided by the application, the water conservancy project food-grade bearing grease composition further comprises an extreme pressure anti-wear agent and / or an anti-rust agent, and meets the HX-1 approval requirement or the FDA specification.

[0017] The water conservancy food-grade bearing grease composition provided by the application, the extreme pressure anti-wear agent mainly comprises one or more of carbonates, borates, metal oxides, metal sulfides and urea acid polyurethane, and meets the HX-1 approval requirement or FDA specification.

[0018] And / or, the rust inhibitor mainly comprises carboxylate and its derivative, polyhydric alcohol borate and its derivative, or a combination of the two, and meets the HX-1 approval requirement or FDA specification.

[0019] The water conservancy food-grade bearing grease composition provided by the application, the extreme pressure anti-wear agent mainly comprises one or more of carbonates, borates, metal oxides, metal sulfides and urea acid polyurethane, and meets the HX-1 approval requirement or FDA specification.

[0020] The application also provides a preparation method of the water conservancy food-grade bearing grease composition.

[0021] Preferably, comprising:

[0022] The thickening agent and the structure modifier are added to the base oil, mixed and heated to not more than 140 DEG C, reacted for 60-120 min, then continuously heated to 140-220 DEG C and continuously reacted for 60-120 min to obtain a first product;

[0023] The temperature of the first product is reduced to below 140 DEG C, and the first product is ground to obtain a second product;

[0024] The extreme pressure anti-wear agent and / or the rust inhibitor are added to the second product, stirred and ground to obtain the water conservancy food-grade bearing grease composition.

[0025] The application also provides an application of the water conservancy food-grade bearing grease composition in lubrication, sealing and protection of water conservancy and hydropower engineering equipment bearings.

[0026] The application provides a food-grade bearing grease composition for water conservancy projects and a preparation method and application thereof.

[0027] The comparison of the grease composition obtained by the application, the patent CN107686763A and the typical physical and chemical properties and toxicological properties of the commercially available products is shown in the following table 1.

[0028] Table 1

[0029] DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0031] If the specific technology or condition is not specified in the embodiments, the technology or condition described in the literature in the art or the product instruction is used. If the manufacturer of the reagent or instrument is not specified, it is a conventional product that can be purchased through a regular channel.

[0032] The sepiolite in the present application is food-grade sepiolite.

[0033] The rest of the components meet the approval requirements of HX-1 or the FDA specifications.

[0034] Example 1

[0035] Put 45 g of sepiolite and 4.5 g of polyester into 255 g of food-grade ether oil with a viscosity of 32 Pa·s at 100℃, heat and mix to 50℃ for 70 minutes, then raise the temperature to 165℃ for 80 minutes. After the reaction is completed, reduce the material temperature to 80℃, grind all the materials, and then add 30 g of carbonate, 15 g of metal oxide, and 1.5 g of polyol borate. After stirring and grinding, a food-grade bearing grease is obtained.

[0036] Example 2

[0037] Put 15 g of sepiolite and 0.15 g of polyether into 295 g of food-grade ester oil base oil with a viscosity of 5 Pa·s at 100℃, heat and mix to 100℃ for 90 minutes, then raise the temperature to 190℃ for 60 minutes. After the reaction is completed, reduce the material temperature to 40℃, grind all the materials, and then add 9 g of metal sulfide, 21 g of urea polyurethane, and 6 g of carboxylate. After stirring and grinding, a food-grade bearing grease is obtained.

[0038] Example 3

[0039] Put 30 g of sepiolite, 6 g of polyether, and 6 g of polyester into 270 g of food-grade ester oil with a viscosity of 98 Pa·s at 100℃, react at 25℃ for 120 minutes, then raise the temperature to 172℃ for 100 minutes. After the reaction is completed, reduce the material temperature to 50℃, grind all the materials, and then add 30 g of urea polyurethane and 1.5 g of carboxylate. After stirring and grinding, a food-grade bearing grease is obtained.

[0040] Example 4

[0041] Put 36 g of sepiolite and 1.8 g of polyester into 264 g of food-grade ether oil base oil with a viscosity of 10 Pa·s at 100℃, heat and mix to 60℃ for 80 minutes, then raise the temperature to 200℃ for 65 minutes. After the reaction is completed, reduce the material temperature to 25℃, grind all the materials, and then add 15 g of carbonate, 1.5 g of borate, 1.5 g of metal sulfide, and 3 g of polyol borate. After stirring and grinding, a food-grade bearing grease is obtained.

[0042] Example 5

[0043] The 69 g of sepiolite, 10.35 g of polyether are added to 231 g of a blended oil of food-grade ether oil and food-grade ester oil (mass ratio of food-grade ether oil to food-grade ester oil is 1:1) with a viscosity of 23 Pa-s at 100°C, the temperature is raised to 45°C and reacted for 70 minutes, then the temperature is raised to 165°C and reacted for 90 minutes, after the reaction is completed, the temperature of the material is reduced to 90°C, all the materials are ground, after the grinding is completed, 3 g of borate, 51 g of urea polyurethane, 9 g of carboxylate are added, stirred uniformly and ground to obtain a food-grade bearing grease.

[0044] Example 6

[0045] The 24 g of sepiolite, 1.2 g of polyether, 1.2 g of polyester are added to 276 g of a blended oil of food-grade ether oil and food-grade ester oil (mass ratio of food-grade ether oil to food-grade ester oil is 7:3) with a viscosity of 138 Pa-s at 100°C, the temperature is raised to 120°C and reacted for 60 minutes, then the temperature is raised to 220°C and reacted for 120 minutes, after the reaction is completed, the temperature of the material is reduced to 140°C, all the materials are ground, after the grinding is completed, 1.5 g of carbonate, 1.5 g of borate, 1.5 g of metal oxide, 1.5 g of metal sulfide, 1.5 g of urea polyurethane, 1.5 g of polyol borate, 1.5 g of carboxylate are added, stirred uniformly and ground to obtain a food-grade bearing grease.

[0046] Comparative Example 1

[0047] The same as Example 1, except that the structural modifier is not contained (the addition ratio of other substances remains the same as Example 1), the performance of the prepared water conservancy food-grade bearing grease composition is tested, the working cone penetration and the extended working cone penetration are used as the indicators for judging the mechanical stability of the grease, and the water leaching loss is used as the indicator for judging the water resistance of the grease, and the test results are shown in the following table. Compared with Example 1, it can be seen that the mechanical stability in Example 1 is better than that in Example 7.

[0048] Comparative Example 2

[0049] The same as Example 1, except that the food-grade ether oil with a viscosity of 32 Pa-s at 100°C is replaced by the same amount of food-grade ester oil with a viscosity of 5 Pa-s at 100°C.

[0050] Comparative Example 3

[0051] The same as Example 1, except that the polyester is replaced by the same amount of polyether.

[0052] It is found that the mixture obtained in the above-mentioned Comparative Examples 2 and 3 cannot be greased, or the cone penetration thereof cannot meet the use requirements.

[0053] The food-grade bearing grease compositions prepared from Examples 1 to 6 and Comparative Example 1 were tested, and the test results are shown in Table 2 below.

[0054] Table 2

[0055]

[0056]

[0057] Analysis and discussion:

[0058] As shown in the above table, the food-grade bearing grease composition of the present application meets the food-grade requirements, is a non-toxic substance, and no toxic and harmful substances are detected, and has excellent high and low temperature applicability, extreme pressure and wear resistance, water resistance, mechanical stability, and rust prevention performance.

[0059] The food-grade bearing grease composition of the present application can meet the lubrication, protection and sealing of water conservancy engineering equipment bearings, and will not pollute the water quality.

[0060] The food-grade bearing grease composition of the present application selects special base oil, thickening agent and specific structure improver, so that the base oil and the thickening agent can form a stable colloidal structure, and the prepared grease has excellent mechanical stability, ensures the service life of the equipment, prolongs the bearing grease change cycle, and reduces the labor cost. When the food-grade bearing grease composition of the present application adopts a structure improver composed of polyether and polyester, the mechanical stability is better than that of a single structure improver, but when a single structure improver is used to prepare a sample, selecting a suitable base oil can make the mechanical stability meet the established index requirements, so the use of which structure improver defined in the present application is not specially specified.

[0061] The food-grade bearing grease composition of the present application has good extreme pressure and wear resistance, and can meet the lubrication of large-scale water conservancy hub equipment, and reduce the wear of the equipment;

[0062] The food-grade bearing grease composition of the present application has qualified rust prevention performance, and protects the equipment bearings from rusting in the application process.

[0063] The food-grade bearing grease composition of the present application has simple preparation process, short production time, and can realize industrialized batch production.

[0064] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water conservancy food-grade bearing grease composition comprising a base oil, a thickening agent and a structure modifier, characterized in that, The base oil contains food-grade ether oil and / or food-grade ester oil; the thickening agent mainly comprises food-grade sepiolite; When the base oil contains food-grade ether oil, the structure improving agent comprises polyester; and / or, when the base oil contains food-grade ester oil, the structure improving agent comprises polyether; The mass ratio of the base oil to the food-grade sepiolite is 55-90:5-40; The adding amount of the structure improving agent is 0.5-30% by mass percentage based on the total amount of the base oil and the thickening agent; The base oil has a viscosity of 1 to 200 mm 2 / s at 100°C.

2. The water works food grade bearing grease composition of claim 1, wherein, The water conservancy food-grade bearing grease composition further comprises extreme pressure anti-wear agent and / or anti-rust agent, and meets the HX-1 approval requirements or FDA specifications.

3. The water works food grade bearing grease composition of claim 2, wherein, The extreme pressure anti-wear agent mainly comprises one or more of carbonates, borates, metal oxides, metal sulfides and urea acid polyurethane, and meets the HX-1 approval requirements or FDA specifications.

4. The water works food grade bearing grease composition according to claim 2 or 3, characterized in that, The anti-rust agent mainly comprises carboxylate and its derivatives, polyhydric alcohol borate and its derivatives, or a combination of the two, and meets the HX-1 approval requirements or FDA specifications.

5. The water works food grade bearing grease composition according to claim 2 or 3, characterized in that, The adding amount of the extreme pressure anti-wear agent is 0.5-20% by mass percentage based on the total amount of the base oil and the thickening agent, and the adding amount of the anti-rust agent is 0.5-10% by mass percentage based on the total amount of the base oil and the thickening agent.

6. The water works food grade bearing grease composition of claim 4, wherein The adding amount of the extreme pressure anti-wear agent is 0.5-20% by mass percentage based on the total amount of the base oil and the thickening agent, and the adding amount of the anti-rust agent is 0.5-10% by mass percentage based on the total amount of the base oil and the thickening agent.

7. A process for the preparation of the water works food grade bearing grease composition according to any one of claims 2 to 6, characterized in that, The thickening agent, the structure improving agent are added to the base oil, mixed and heated to not more than 140℃, reacted for 60-120 min, then continuously heated to 140-220℃ and reacted for 60-120 min to obtain a first product; The temperature of the first product is reduced to below 140℃, and the first product is ground to obtain a second product; The extreme pressure anti-wear agent and / or the anti-rust agent are added to the second product, stirred and ground to obtain the water conservancy food-grade bearing grease composition.

8. The water conservancy food-grade bearing grease composition according to any one of claims 1-6 is applied to the lubrication, sealing and protection of water conservancy and hydropower engineering equipment bearings.

Images