Boron-containing lubricating grease for cycloidal-pin wheel speed reducer and preparation method thereof

Abstract

The invention discloses a boron-containing lubricating grease composition for a cycloidal-pin wheel speed reducer, which comprises the following components in percentage by mass: 85-95% of base oil, 3.0-8.0% of a thickening agent and 5-10% of an additive, and the sum of the mass percentages of the components is 100%. The invention further discloses a preparation method of the boron-containing lubricating grease for the cycloidal-pin wheel speed reducer, the cycloidal-pin wheel lithium-based lubricating grease with a relatively high dropping point can be prepared without special equipment and process, and compared with the traditional cycloidal-pin wheel lithium-based lubricating grease, the boron-containing lubricating grease has the advantages of excellent high temperature resistance, extreme pressure wear resistance and relatively low friction coefficient, and can be used for preparing the cycloidal-pin wheel speed reducer. And the adhesive property and the water resistance are excellent.

Description

Technical Field

[0001] The invention belongs to the technical field of lubricating greases, and relates to a boron-containing lubricating grease composition for a cycloidal pinwheel reducer. The invention also relates to a preparation method of the boron-containing lubricating grease for a cycloidal pinwheel reducer. Background Art

[0002] Cycloidal pinwheel reducer grease generally uses lithium-based grease with excellent shear resistance, that is, 12-hydroxy lithium stearate is used as a thickener. This product has a low dropping point and does not have good extreme pressure and anti-wear properties. Boric acid, as a commonly used compounding agent for preparing composite lithium-based grease, has the advantages of excellent high temperature performance, extreme pressure and anti-wear properties. However, since the boron-hydroxy system lithium-based grease is difficult to compound and has high requirements for the preparation process, it is difficult to promote large-scale industrial production, which limits the development and production application of this composite lithium-based grease.

[0003] For the development and application of boron-hydroxyl system lithium-based composite grease, the existing technology mainly focuses on selecting appropriate process control conditions, multi-component thickener research or adding structure improvers, etc. However, the current research on cycloid pinwheel reducer grease focuses on additives, and does not start from thickeners to solve the high temperature resistance and extreme pressure anti-wear performance of the product. Summary of the invention

[0004] The purpose of the present invention is to provide a boron-containing lubricating grease composition for a cycloidal pinwheel reducer, which has the characteristics of excellent extreme pressure and anti-wear properties and a relatively low friction coefficient.

[0005] Another object of the present invention is to provide a method for preparing the above-mentioned boron-containing grease composition for the cycloid pinwheel reducer.

[0006] The technical solution adopted by the present invention is:

[0007] The boron-containing grease for the cycloid pinwheel reducer is composed of the following components by mass percentage: 85-95% of base oil, 3.0-8.0% of thickener, 5-10% of additive, and the sum of the mass percentages of the above components is 100%.

[0008] The present invention is also characterized in that:

[0009] The thickener is composed of three components: 12-hydroxystearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1. The chemical formula of disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

[0010] The thickener is composed of four components: 12-hydroxystearic acid, stearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to stearic acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1, and the chemical formula of disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

[0011] The base oil is one or a combination of mineral oil, poly-α-olefin, and ester oil, and its 40-degree viscosity grade ranges from 10 to 460 cst.

[0012] The additives are composed of three components: molybdenum dialkyl dithiocarbamate, antimony dialkyl dithiocarbamate and zinc dialkyl dithiophosphate. The molar ratio of molybdenum dialkyl dithiocarbamate to antimony dialkyl dithiocarbamate is 1:0.1-1, and the molar ratio of molybdenum dialkyl dithiocarbamate to zinc dialkyl dithiophosphate is 1:0.1-1.

[0013] The preparation method of the boron-containing grease for the cycloid pinwheel reducer is specifically implemented according to the following steps:

[0014] Step 1, selecting 85-95% base oil, 3.0-8.0% thickener, 5-10% additive, the sum of the mass percentages of the above components is 100%;

[0015] Step 2, adding base oil, thickener and water into the reaction kettle in sequence, heating to 80-85° C., stirring evenly to obtain a mixture;

[0016] Step 3, heating the mixture of step 2 to 135-140° C. and saponifying at constant temperature for 45-50 minutes;

[0017] Step 4, continue to heat up to 146-150°C while releasing pressure and dehydrating, close the pressure relief valve after the pressure relief is completed, heat up to 205-210°C and keep the temperature constant for 10-15 minutes, cool down to 80-85°C, add additives, remove from the kettle and grind to obtain the boron-containing grease for the cycloidal pinwheel reducer.

[0018] The thickener is composed of three components: 12-hydroxystearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1. The chemical formula of disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

[0019] The thickener is composed of four components: 12-hydroxystearic acid, stearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to stearic acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1, and the chemical formula of disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

[0020] The base oil is one or a combination of mineral oil, poly-α-olefin, and ester oil, and its 40-degree viscosity grade ranges from 10 to 460 cst.

[0021] The additives are composed of three components: molybdenum dialkyl dithiocarbamate, antimony dialkyl dithiocarbamate and zinc dialkyl dithiophosphate. The molar ratio of molybdenum dialkyl dithiocarbamate to antimony dialkyl dithiocarbamate is 1:0.1-1, and the molar ratio of molybdenum dialkyl dithiocarbamate to zinc dialkyl dithiophosphate is 1:0.1-1.

[0022] The beneficial effects of the present invention are as follows: the present invention can prepare cycloidal pinwheel lithium-based grease with a higher dropping point without the need for special equipment and processes, and compared with traditional cycloidal pinwheel lithium-based grease, the grease has excellent high temperature resistance, extreme pressure and wear resistance, a lower friction coefficient, excellent adhesion and water resistance. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with specific implementation modes.

[0024] The boron-containing lubricating grease for the cycloid pinwheel reducer of the present invention is composed of the following components by mass percentage: 85-95% of base oil, 3.0-8.0% of thickener, 5-10% of additive, and the sum of the mass percentages of the above components is 100%.

[0025] Furthermore, the thickener is any one of the following (1) or (2):

[0026] (1) The thickener is composed of three components: 12-hydroxystearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1.

[0027] (2) The thickener is composed of four components: 12-hydroxystearic acid, stearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to stearic acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.1.

[0028] Furthermore, the chemical formula of the disubstituted boronic acid is: R2-B(OH).

[0029] Furthermore, R in the disubstituted boronic acid is C2~C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

[0030] Furthermore, the base oil is one or a combination of mineral oil, poly-alpha-olefin (PAO), and ester oil, and its 40 degree viscosity grade ranges from 10 to 460 cst.

[0031] Furthermore, the additive is a mixture of three components: molybdenum dialkyl dithiocarbamate (MoDTC), antimony dialkyl dithiocarbamate, and zinc dialkyl dithiophosphate (ZDDP), the molar ratio of molybdenum dialkyl dithiocarbamate to antimony dialkyl dithiocarbamate is 1:0.1~1, and the molar ratio of molybdenum dialkyl dithiocarbamate to zinc dialkyl dithiophosphate is 1:0.1~1.

[0032] Furthermore, the preparation method of the boron-containing grease for the cycloid pinwheel reducer is specifically implemented according to the following steps:

[0033] Step 1, selecting 85-95% base oil, 3.0-8.0% thickener, 5-10% additive, the sum of the mass percentages of the above components is 100%;

[0034] Step 2, adding base oil, thickener and water into the reaction kettle in sequence, heating to 80-85° C., stirring evenly to obtain a mixture;

[0035] Step 3, heating the mixture of step 2 to 135-140° C. and saponifying at constant temperature for 45-50 minutes;

[0036] Step 4, continue to heat up to 146-150°C while releasing pressure and dehydrating, close the pressure relief valve after the pressure relief is completed, heat up to 205-210°C and keep the temperature constant for 10-15 minutes, cool down to 80-85°C, add additives, remove from the kettle and grind to obtain the boron-containing grease for the cycloidal pinwheel reducer.

[0037] Example 1

[0038] 12000g polyalphaolefin PAO10, 750g dodecyl stearic acid, 133g lithium hydroxide monohydrate, 90g diphenylboric acid and 1500g water were put into the reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at constant temperature for 45min. Continue to heat to 146°C and depressurize at the same time. After the pressure relief is completed, close the pressure relief valve, heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C. Add 750g dibutyl dithiocarbamate molybdenum, 200g antimony carbamate, 200g sulfur phosphorus dioctyl basic zinc salt (trade name T203), remove from the reactor and grind to obtain the desired product. Sample properties are shown in Table 1.

[0039] Example 2

[0040] 12000g of cycloalkyl rubber oil KN4010, 750g of dodecyl stearic acid, 155g of lithium hydroxide monohydrate, 141g of dibutyl boric acid and 1500g of water were put into a reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at constant temperature for 45min. Continue to heat to 146°C and depressurize at the same time. After the pressure relief is completed, close the pressure relief valve, quickly heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C, add 750g of dibutyl dithiocarbamate molybdenum (trade name T351), 150g of antimony carbamate (trade name V73+), 150g of thiophosphorus butyl octyl zinc salt (trade name T202), remove from the reactor and grind to obtain the desired product. The sample properties are shown in Table 1.

[0041] Example 3

[0042] 6000g of cycloalkyl rubber oil KN4010, 6000g of polyalphaolefin PAO10, 550g of dodecyl stearic acid, 183g of stearic acid, 155g of lithium hydroxide monohydrate, 141g of dibutyl boric acid and 1500g of water were put into a reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at a constant temperature for 45min. Continue to heat to 146°C and depressurize at the same time. After the pressure relief is completed, close the pressure relief valve, quickly heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C. Add 750g of dibutyl dithiocarbamate molybdenum, 200g of antimony carbamate, and 200g of dioctyl alkaline zinc salt of sulfur and phosphorus (trade name T203), remove from the reactor and grind to obtain the desired product. The sample properties are shown in Table 1.

[0043] Comparative Example 1

[0044] 12000g polyalphaolefin PAO10, 750g dodecyl stearic acid, 115g lithium hydroxide monohydrate and 1500g water were put into the reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at constant temperature for 45min. Continue to heat to 146°C and depressurize at the same time. After the pressure relief is completed, close the pressure relief valve, quickly heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C. Add 750g dibutyl dithiocarbamate molybdenum, 200g antimony carbamate, 200g thiophosphorus dioctyl basic zinc salt (trade name T203), remove from the reactor and grind to obtain the desired product. The sample properties are shown in Table 1.

[0045] Comparative Example 2

[0046] 12000g of cycloalkyl rubber oil KN4010, 750g of dodecyl stearic acid, 115g of lithium hydroxide monohydrate and 1500g of water were put into the reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at constant temperature for 45min. Continue to heat to 146°C and depressurize and dehydrate at the same time. After the pressure relief is completed, close the pressure relief valve, quickly heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C. Add 750g of dibutyl dithiocarbamate molybdenum (trade name T351), 150g of antimony carbamate (trade name V73+), 150g of thiophosphorus butyl octyl zinc salt (trade name T202), remove from the reactor and grind to obtain the desired product. The sample properties are shown in Table 1.

[0047] Comparative Example 3

[0048] 6000g of cycloalkyl rubber oil KN4010, 6000g of polyalphaolefin PAO10, 550g of dodecyl stearic acid, 183g of stearic acid, 115g of lithium hydroxide monohydrate and 1500g of water were put into the reactor, heated to 80°C and stirred evenly. Then heated to 135°C and saponified at constant temperature for 45min. Continue to heat to 146°C and depressurize at the same time. After the pressure relief is completed, close the pressure relief valve, quickly heat to 205°C and keep the temperature constant for 10min, slowly cool down and shear disperse until the temperature drops to 80°C. Add 750g of dibutyl dithiocarbamate molybdenum, 200g of antimony carbamate, 200g of sulfur phosphorus dioctyl basic zinc salt (trade name T203), remove from the reactor and grind to obtain the desired product. The sample properties are shown in Table 1.

[0049] Table 1 Comparison of grease performance

[0050]

[0051] It can be seen from Table 1 that the cycloidal pinwheel reducer grease prepared by the present invention has a higher dropping point, better adhesion and water resistance than the product prepared by the traditional method, and significantly improves the extreme pressure and wear resistance and reduces the friction coefficient.

Claims

1. Cycloidal pinwheel reducer boron grease, characterized by: The composition is composed of the following components by mass percentage: 85-95% of base oil, 3.0-8.0% of thickener, and 5-10% of additives. The sum of the mass percentages of the above components is 100%.

2. The boron-containing grease for cycloid pinwheel reducer according to claim 1, characterized in that: The thickener is composed of three components: 12-hydroxystearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.

1. The chemical formula of the disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

3. The boron-containing grease for cycloid pinwheel reducer according to claim 1, characterized in that: The thickener is composed of four components: 12-hydroxystearic acid, stearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to stearic acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.

1. The chemical formula of the disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

4. The boron-containing grease for cycloid pinwheel reducer according to claim 1, characterized in that: The base oil is one or a combination of mineral oil, poly-α-olefin, and ester oil, and its 40 degree viscosity grade range is between 10 and 460 cst.

5. The boron-containing grease for cycloid pinwheel reducer according to claim 1, characterized in that: The additives are composed of three components: molybdenum dialkyl dithiocarbamate, antimony dialkyl dithiocarbamate, and zinc dialkyl dithiophosphate. The molar ratio of molybdenum dialkyl dithiocarbamate to antimony dialkyl dithiocarbamate is 1:0.1-1, and the molar ratio of molybdenum dialkyl dithiocarbamate to zinc dialkyl dithiophosphate is 1:0.1-1.

6. A method for preparing a boron-containing grease for a cycloid pinwheel reducer, characterized in that: Follow the steps below to implement it: Step 1, selecting 85-95% base oil, 3.0-8.0% thickener, 5-10% additive, the sum of the mass percentages of the above components is 100%; Step 2, adding base oil, thickener and water into the reaction kettle in sequence, heating to 80-85° C., stirring evenly to obtain a mixture; Step 3, heating the mixture of step 2 to 135-140° C. and saponifying at constant temperature for 45-50 minutes; Step 4, continue to heat up to 146-150°C while releasing pressure and dehydrating, close the pressure relief valve after the pressure relief is completed, heat up to 205-210°C and keep the temperature constant for 10-15 minutes, cool down to 80-85°C, add additives, remove from the kettle and grind to obtain the boron-containing grease for the cycloidal pinwheel reducer.

7. The method for preparing the boron-containing grease for the cycloid pinwheel reducer according to claim 6, characterized in that: The thickener is composed of three components: 12-hydroxystearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.

1. The chemical formula of the disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

8. The method for preparing the boron-containing grease for the cycloid pinwheel reducer according to claim 6, characterized in that: The thickener is composed of four components: 12-hydroxystearic acid, stearic acid, disubstituted boric acid and lithium hydroxide aqueous solution. The molar ratio of 12-hydroxystearic acid to stearic acid is 1:0.1-1, the molar ratio of 12-hydroxystearic acid to disubstituted boric acid is 1:0.1-1, and the molar ratio of 12-hydroxystearic acid to lithium hydroxide aqueous solution is 1:1.05-1.

1. The chemical formula of the disubstituted boric acid is: R2-B(OH), wherein R is C2-C 12 It can be one or a combination of C5-C8 alkyl, C5-C8 cycloalkyl or 1-4 aryl groups.

9. The method for preparing the boron-containing grease for the cycloid pinwheel reducer according to claim 6, characterized in that: The base oil is one or a combination of mineral oil, poly-α-olefin, and ester oil, and its 40 degree viscosity grade range is between 10 and 460 cst.

10. The method for preparing the boron-containing grease for the cycloid pinwheel reducer according to claim 6, characterized in that: The additives are composed of three components: molybdenum dialkyl dithiocarbamate, antimony dialkyl dithiocarbamate and zinc dialkyl dithiophosphate. The molar ratio of molybdenum dialkyl dithiocarbamate to antimony dialkyl dithiocarbamate is 1:0.1-1, and the molar ratio of molybdenum dialkyl dithiocarbamate to zinc dialkyl dithiophosphate is 1:0.1-1.

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