Granularity-controllable solid borate extreme pressure anti-wear additive and preparation method thereof

Abstract

The invention provides a solid borate extreme pressure anti-wear additive with a controllable particle size and a preparation method of the solid borate extreme pressure anti-wear additive. According to the borate extreme pressure anti-wear additive disclosed by the invention, borate solid powder with different particle sizes can be produced according to different material proportions and drying conditions, so that specific performance requirements are met. The preparation method of the borate extreme pressure anti-wear additive comprises the following steps: (1) adding boric acid into a potassium hydroxide aqueous solution, and reacting at 50-100 DEG C for 1-2 hours; and (2) pumping the mixture in the step (1) into a drying device, and obtaining the borate extreme pressure anti-wear additive with controllable granularity under a certain drying condition. The borate extreme pressure anti-wear additive disclosed by the invention is better in anti-wear performance and smaller in influence on the structural stability of lubricating grease. In addition, the technological process is simple, the particle size of the borate solid is adjustable, and the application field of borate is enriched.

Description

Technical Field

[0001] The invention relates to a solid borate extreme pressure anti-wear additive with controllable particle size and a preparation method thereof, and belongs to the technical field of lubrication. Background Art

[0002] Borates are a type of extreme pressure anti-wear additives. They are widely used as additives for lubricating greases because of their good anti-wear and friction reduction properties, non-toxicity, no special odor, good corrosion resistance to metals, and high efficiency of extreme pressure anti-wear performance at high temperatures. In addition, the mechanism of action of borate extreme pressure additives is also different from that of other organic extreme pressure anti-wear agents. It is not due to the reaction with metals to form a reaction film, but due to the fact that when the friction parts move relative to each other, their surfaces are charged with borate particles that adhere to them to form an extreme pressure film. This film is thick and sticky, and acts as an inorganic lubricating film.

[0003] In recent years, borate additives are roughly divided into three types: one is borate with sodium petroleum sulfonate as a dispersant, which is to disperse potassium borate in an aqueous solution in oil and then remove water. Its disadvantage is that because the product contains sodium petroleum sulfonate, it affects the colloidal stability of the product when used in grease, and then affects the dropping point, consistency, mechanical stability, water resistance and other properties of the grease, so it is basically impossible to use in grease; the second is to dry potassium borate, grind it into fine powder, and use it directly in the product. Its disadvantage is poor dispersibility, and precipitation occurs in some high-viscosity oils and semi-fluid greases, thus limiting its scope of use. The third is a nano-ultrafine borate lubricant additive, which uses the ultrasonic emulsification method introduced in the CN1175621A patent technology and the spray drying method introduced in the CN1986756A patent technology. The process is complicated and the efficiency is not high, and the product application range is limited.

[0004] In the patents CN102627996A and CN101368125A previously applied by the applicant, the borate extreme pressure anti-wear additives disclosed therein are mainly semi-fluid borate extreme pressure anti-wear additives and preparation methods thereof, which solve the problem of poor water resistance of borate additives and have certain anti-wear and anti-pressure properties. However, this type of borate additive has a great influence on the structural stability of the grease, and the semi-fluid borate extreme pressure anti-wear additives are also subject to certain limitations in terms of extreme pressure and anti-wear properties. Summary of the invention

[0005] In view of the existing problems, the present invention aims to provide a solid borate extreme pressure anti-wear additive with controllable particle size and a preparation method thereof. The borate extreme pressure anti-wear additive of the present invention can produce borate solid powders of different particle sizes according to different material ratios and drying conditions to achieve specific performance requirements. The preparation method of the borate extreme pressure anti-wear additive of the present invention comprises the following steps: (1) adding boric acid to a potassium hydroxide aqueous solution and reacting at 50-100°C for 1-2 hours; (2) pumping the mixture in step (1) into a drying device to obtain a borate extreme pressure anti-wear additive with controllable particle size under certain drying conditions. The borate extreme pressure anti-wear additive of the present invention has better anti-wear performance and less effect on the structural stability of the grease. In addition, the process is simple, and the particle size of the borate solid is adjustable, which enriches the application field of borates.

[0006] The object of the present invention is achieved by the following scheme: a solid borate extreme pressure and anti-wear additive with controllable particle size and a preparation method thereof, which can produce borate solid powders with different particle sizes according to different material ratios and drying conditions to achieve specific performance requirements, comprising the following steps:

[0007] (1) Adding boric acid to a potassium hydroxide aqueous solution and reacting at 50-100° C. for 1-2 hours, wherein the molar ratio of boric acid to potassium hydroxide is (0.5-3.0): 1. (2) Pumping the mixture of the material in step (1) with a mass ratio of water to 1: (0.5-9.0) into a drying device, and obtaining a borate extreme pressure anti-wear additive with controllable particle size under the drying conditions of a nozzle speed of 200-20000 rpm, an air inlet temperature of 110-300° C., and a flow rate of 30-300 ml / min.

[0008] The present invention has the following advantages: the solid borate extreme pressure anti-wear additive with controllable particle size provided by the method has better extreme pressure anti-wear performance than existing products, and has less influence on the structural stability of the grease. In addition, the process is simple, the particle size of the borate solid is adjustable, and the application field of the borate is enriched. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 : Comparison of extreme pressure and anti-wear performance of the products of Examples 1-6 and semi-fluid borate extreme pressure and anti-wear additive A in single lithium soap grease in Example 7

[0010] Figure 2 : Comparison of extreme pressure and anti-wear performance of the products of Examples 1-6 and semi-fluid borate extreme pressure and anti-wear additive A in complex lithium soap-based grease in Example 8

[0011] Figure 3: Comparison of extreme pressure and anti-wear performance of the products of Examples 1-6 and semi-fluid borate extreme pressure and anti-wear additive A in polyurea soap-based grease in Example 9

[0012] Figure 4 : Comparison of dropping points of the products of Examples 1-6 and semi-fluid borate extreme pressure anti-wear additive A in complex lithium soap-based grease in Example 10

[0013] The technical scheme of the present invention is further described below through specific examples. The following examples are further explanations of the present invention, but do not limit the scope of the present invention.

[0014] Example 1

[0015] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0016] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 1:1; a mixture of the reacted material and water in a mass ratio of 1:1 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 50-100 μm is obtained under the drying conditions of a drying equipment nozzle speed of 400 rpm, an inlet air temperature of 200°C, and a flow rate of 40 ml / min.

[0017] Example 2

[0018] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0019] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 1.5:1; a mixture of the reacted material and water in a mass ratio of 1.5:1 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 40-70 μm is obtained under the drying conditions of a drying equipment nozzle speed of 400 rpm, an inlet air temperature of 200°C, and a flow rate of 40 ml / min.

[0020] Example 3

[0021] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0022] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 2:1; a mixture of the reacted material and water in a mass ratio of 2:1 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 30-50 μm is obtained under the drying conditions of a drying equipment nozzle speed of 400 rpm, an inlet air temperature of 200°C, and a flow rate of 40 ml / min.

[0023] Example 4

[0024] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0025] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 2:1; a mixture of the reacted material and water in a mass ratio of 1:2 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 20-40 μm is obtained under the drying conditions of a drying equipment nozzle speed of 12000 rpm, an inlet air temperature of 180°C, and a flow rate of 200 ml / min.

[0026] Example 5

[0027] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0028] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 2:1; a mixture of the reacted material and water in a mass ratio of 1:4 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 10-30 μm is obtained under the drying conditions of a drying equipment nozzle speed of 12000 rpm, an inlet air temperature of 180°C, and a flow rate of 150 ml / min.

[0029] Example 6

[0030] This embodiment provides a solid borate extreme pressure and anti-wear additive with controllable particle size, and the specific steps are as follows:

[0031] Boric acid is added to a potassium hydroxide aqueous solution and reacted at 80°C for 1.5 hours, wherein the molar ratio of boric acid to potassium hydroxide is 3:1; a mixture of the reacted material and water in a mass ratio of 1:8 is pumped into a drying device, and a borate extreme pressure and anti-wear additive with a particle size of 5-15 μm is obtained under the drying conditions of a drying equipment nozzle speed of 12000 rpm, an inlet air temperature of 180°C, and a flow rate of 100 ml / min.

[0032] Example 7

[0033] 2% of the products provided in Examples 1-6 were respectively used in a single lithium soap grease for an extreme pressure and anti-wear performance comparison test with the semi-fluid borate extreme pressure and anti-wear additive A in the CN102627996A patent previously applied by the present applicant. The extreme pressure and anti-wear performance test method is the four-ball extreme pressure performance test SH / T 0202 and the grease anti-wear performance test SH / T 0204. The extreme pressure and anti-wear performance comparison test results are shown in FIG. Figure 1 shown. Figure 1 It shows that among the monolithium soap-based greases, the extreme pressure and anti-wear properties of the products provided by Examples 1-6 are better than those of the semi-fluid borate extreme pressure and anti-wear additive A.

[0034] Example 8

[0035] 2% of the products provided in Examples 1-6 were respectively used in a composite lithium soap-based grease for an extreme pressure and anti-wear performance comparison test with the semi-fluid borate extreme pressure and anti-wear additive A in the CN102627996A patent previously applied by the present applicant. The extreme pressure and anti-wear performance test method is the four-ball extreme pressure performance test SH / T 0202 and the grease anti-wear performance test SH / T 0204. The extreme pressure and anti-wear performance comparison test results are shown in FIG. Figure 2 shown. Figure 2 It shows that among the monolithium soap-based greases, the extreme pressure and anti-wear properties of the products provided by Examples 1-6 are better than those of the semi-fluid borate extreme pressure and anti-wear additive A.

[0036] Example 9

[0037] 2% of the products provided in Examples 1-6 were respectively used in a polyurea soap-based grease for an extreme pressure and anti-wear performance comparison test with the semi-fluid borate extreme pressure and anti-wear additive A in the CN102627996A patent previously applied by the present applicant. The extreme pressure and anti-wear performance test method is the four-ball extreme pressure performance test SH / T 0202 and the grease anti-wear performance test SH / T 0204. The extreme pressure and anti-wear performance comparison test results are shown in FIG. Figure 3 shown. Figure 3 It shows that among the monolithium soap-based greases, the extreme pressure and anti-wear properties of the products provided by Examples 1-6 are better than those of the semi-fluid borate extreme pressure and anti-wear additive A.

[0038] Example 10

[0039] 2% of the products provided in Examples 1-6 were respectively subjected to a dropping point comparison test with the semi-fluid borate extreme pressure anti-wear additive A in the CN102627996A patent previously applied by the present applicant in a complex lithium soap-based grease. The dropping point test method is the wide temperature range dropping point test for grease GB / T3498. The dropping point comparison test results are shown in FIG. Figure 4 shown. Figure 4 It shows that among the complex lithium soap-based greases, the products provided in Examples 1-6 have little effect on the structural stability of the grease and are all better than the semi-fluid borate extreme pressure anti-wear additive A.

[0040] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate the particle size controllable solid borate extreme pressure anti-wear additive and the preparation method thereof, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0041] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. A solid borate extreme pressure and anti-wear additive with controllable particle size and a preparation method thereof, characterized in that: The solid borate extreme pressure and anti-wear additive with controllable particle size can produce borate solid powders with different particle sizes according to different material ratios and drying conditions, thereby achieving specific performance requirements.

2. The solid borate extreme pressure and anti-wear additive with controllable particle size and the preparation method thereof according to claim 1, characterized in that: The preparation method of the solid borate extreme pressure and anti-wear additive with controllable particle size comprises the following steps: (1) adding boric acid to a potassium hydroxide aqueous solution and reacting at 50-100° C. for 1-2 hours; (2) pumping the mixture in step (1) into a drying device to obtain the borate extreme pressure and anti-wear additive with controllable particle size under certain drying conditions.

3. The solid borate extreme pressure and anti-wear additive with controllable particle size and the preparation method thereof according to claims 1-2, characterized in that: The material ratio is a molar ratio of boric acid to potassium hydroxide of (0.5-3.0):

1.

4. The solid borate extreme pressure and anti-wear additive with controllable particle size and the preparation method thereof according to claims 1-2, characterized in that: The drying conditions are as follows: the nozzle speed of the drying equipment is 200-20000rpm, the air inlet temperature is 110-300°C, the flow rate is 30-300ml / min, and the mass ratio of the material to water during feeding is 1:(0.5-9.0).

5. The solid borate extreme pressure and anti-wear additive with controllable particle size according to claim 1, characterized in that: The solid borate extreme pressure anti-wear additive has a particle size in the range of 40-100 μm and exhibits excellent extreme pressure performance for different greases, preferably single lithium soap, complex lithium soap and polyurea soap-based greases.

6. The solid borate extreme pressure and anti-wear additive with controllable particle size according to claim 1, characterized in that: The solid borate extreme pressure anti-wear additive has a particle size in the range of 10-50 μm and exhibits excellent anti-wear performance for different greases, preferably single lithium soap, complex lithium soap and polyurea soap-based greases.

7. The solid borate extreme pressure and anti-wear additive with controllable particle size according to claim 1, characterized in that: The particle size of the solid borate extreme pressure anti-wear additive in the range of 5-100 μm has little effect on the structural stability of different greases, and is preferably in the range of single lithium soap, complex lithium soap and polyurea soap-based greases.

8. The solid borate extreme pressure and anti-wear additive with controllable particle size according to claim 1, characterized in that: The solid borate extreme pressure anti-wear additive has application scopes in the fields of novel optoelectronic functional crystal materials, commercial glass, amorphous oxide catalysts and grease additives, and preferably has excellent performance in grease, lubricating paste and non-aqueous semi-fluid lubricant.

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