Cooling and heat-dissipating lubricant for diamond drill bit and preparation process of cooling and heat-dissipating lubricant

Abstract

The invention relates to a cooling and heat-dissipating lubricant for a diamond drill bit and a preparation process thereof. The cooling and heat-dissipating lubricant comprises the following components in percentage by mass: 80-95% of low-temperature paraffin; 2%-20% of a solid lubricating material; 1%-5% of a precipitant; 1%-5% of a thickener; the low-temperature paraffin is specifically one of polyethylene wax or polypropylene wax, the solid lubricating material is prepared from the following raw materials in parts by weight: 5-20 parts of polytetrafluoroethylene and 1-5 parts of hexagonal boron nitride powder, the precipitator is polyacrylamide, and the thickener is one or more of polyvinyl alcohol and hydroxymethyl cellulose; the cooling and heat dissipation lubricant prepared by the invention shows good stability, relatively low friction coefficient, good flowability and extreme pressure lubrication performance, and is suitable for application of a diamond drill bit; polyacrylamide is added as a precipitator to enhance the dispersity of a solid lubricating material in liquid paraffin, and the material is prevented from precipitating or gathering, so that the stability of the lubricant is enhanced.

Description

Technical Field

[0001] The invention relates to the field of lubricants, and in particular to a cooling and heat dissipating lubricant for diamond drill bits and a preparation process thereof. Background Art

[0002] Drill bits that use diamond material as cutting edges are collectively called diamond drill bits. Diamond drill bits are a tool used for drilling and cutting hard materials. Their main feature is that they use diamond as the tool material. Diamond is the hardest substance in nature and has extremely high wear resistance and heat resistance, so diamond drill bits perform well when processing hard materials. Diamond drill bits are widely used in drilling and drilling operations of materials such as stone and ceramics. However, during the drilling process, due to the friction between the drill bit and the processed material, a large amount of heat will be generated between the drill bit and the processed material, causing the drill bit temperature to rise significantly. This overheating phenomenon not only shortens the service life of the drill bit, but may also cause resource waste.

[0003] In the process of using diamond drill bits, it is very important to choose appropriate cooling measures. The commonly used cooling method is to spray coolant. However, although spraying coolant can cool the drill bit when it is working, if there is a lack of sufficient polymer precipitant in the coolant and the concentration of stone powder is high, it will cause increased friction, thereby accelerating the wear of the drill bit. At this time, the bonding of diamond particles will also be affected, which may cause them to fall off prematurely, thereby significantly reducing the service life of the drill bit. In order to precipitate stone powder, a common measure is to add inorganic electrolytes as precipitants, such as NaCl, to the coolant. However, when the concentration of stone powder increases, the NaCl content in the cooling lubricant often cannot meet the requirements of effective precipitation, resulting in severe flocculent separation of the cooling lubricant in the early stage, loss of stability, and thus affecting the cooling effect. In view of this, this study aims to explore a cooling and heat dissipation lubricant for diamond drill bits and its preparation process, in order to improve the performance and life of diamond drill bits. Summary of the invention

[0004] The present invention provides a cooling and heat dissipating lubricant for a diamond drill bit and a preparation process thereof, so as to solve the technical problems existing in the background technology.

[0005] To solve the above problems, the technical solution of the present invention is:

[0006] A cooling and heat dissipation lubricant for a diamond drill bit, comprising the following components in percentage by mass:

[0007]

[0008] Preferably, the low-temperature paraffin wax is polyethylene wax or polypropylene wax.

[0009] Preferably, the solid lubricating material is made of raw materials comprising the following parts by weight: 5 to 20 parts of polytetrafluoroethylene and 1 to 5 parts of hexagonal boron nitride powder.

[0010] Preferably, the thickener is one or more of polyvinyl alcohol and hydroxymethyl cellulose.

[0011] Preferably, the dispersant is one or more of cetyltrimethylammonium chloride and polyoxyethylene octyl alcohol ether.

[0012] The present invention also discloses a preparation process of a cooling and heat dissipating lubricant for a diamond drill bit, comprising the following steps:

[0013] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0014] Step 2: placing the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material;

[0015] Step 3: Heat the low-temperature paraffin weighed in step 1 to 80°C to 120°C to completely melt it into liquid paraffin, and maintain it at a constant temperature of 80°C to 120°C;

[0016] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 80° C. to 120° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0017] Step 5: While maintaining the temperature at 80°C to 120°C, add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0018] In the above technical solution, the ball milling parameters in step 2 are: abrasive ratio is 1:(1-5), ball milling speed is 200-400r / min, and ball milling time is 20-120 minutes.

[0019] The above technical solution of the present invention has the following beneficial technical effects:

[0020] 1. The cooling and heat dissipation lubricant prepared by the present invention exhibits good stability, low friction coefficient, good fluidity and extreme pressure lubrication performance, and is suitable for the application of diamond drill bits;

[0021] 2. The present invention enhances the dispersibility of the solid lubricating material in the liquid paraffin by adding polyacrylamide as a precipitant, thereby preventing the material from settling or agglomerating, thereby enhancing the stability and uniformity of the lubricant. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0023] Example 1

[0024] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 1 below.

[0025] Table 1 shows the dosage of each raw material component of the lubricant in Example 1

[0026]

[0027]

[0028] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 5 parts of polytetrafluoroethylene and 5 parts of hexagonal boron nitride powder, the precipitant is polyacrylamide, the viscosity agent is a mixture of polyvinyl alcohol and hydroxymethyl cellulose in a mass ratio of 1:1, and the dispersant is hexadecyltrimethylammonium chloride.

[0029] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0030] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0031] Step 2: Put the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio is 1: (1-5), ball milling speed is 200-400r / min, and ball milling time is 20-120 minutes;

[0032] Step 3: Heat the low-temperature paraffin weighed in step 1 to 80°C to 120°C to completely melt it into liquid paraffin, and maintain it at a constant temperature of 80°C to 120°C;

[0033] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 80° C. to 120° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0034] Step 5: While maintaining the temperature at 80°C to 120°C, add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0035] Example 2

[0036] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 2 below.

[0037] Table 2 shows the dosage of each raw material component of the lubricant in Example 2

[0038] Components Mass percentage (Wt%) Low temperature paraffin 87 Solid lubricant 6.3 Precipitant 2.8 Thickener 2.2 Dispersants 0.7

[0039] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 12 parts of polytetrafluoroethylene and 4 parts of hexagonal boron nitride powder, the precipitant is polyacrylamide, the viscosity agent is polyvinyl alcohol and hydroxymethyl cellulose mixed in a mass ratio of 1:1, and the dispersant is hexadecyltrimethylammonium chloride and polyoxyethylene octyl alcohol ether mixed in a mass ratio of 2:1.

[0040] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0041] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0042] Step 2: Put the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio of 1:3, ball milling speed of 300 r / min, and ball milling time of 80 minutes;

[0043] Step 3: Heat the low-temperature paraffin weighed in step 1 to 100° C. to completely melt it into liquid paraffin, and keep it at a constant temperature of 100° C.;

[0044] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 100° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0045] Step 5: While maintaining the temperature at 100° C., add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0046] Example 3

[0047] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 3 below.

[0048] Table 3 shows the dosage of each raw material component of the lubricant in Example 1

[0049] Components Mass percentage (Wt%) Low temperature paraffin 92 Solid lubricant 2.5 Precipitant 2.2 Thickener 2.8 Dispersants 0.5

[0050] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 18 parts of polytetrafluoroethylene and 3 parts of hexagonal boron nitride powder, the precipitant is polyacrylamide, the viscosity agent is hydroxymethyl cellulose, and the dispersant is polyoxyethylene octyl alcohol ether.

[0051] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0052] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0053] Step 2: The solid lubricating material and dispersant weighed in the above step 1 are placed in a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio of 1:5, ball milling speed of 380 r / min, and ball milling time of 115 minutes;

[0054] Step 3: Heat the low-temperature paraffin weighed in step 1 to 120° C. to completely melt it into liquid paraffin, and keep it at a constant temperature of 120° C.;

[0055] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 120° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0056] Step 5: While maintaining the temperature at 120° C., add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0057] Example 4

[0058] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 4 below.

[0059] Table 4 shows the dosage of each raw material component of the lubricant in Example 4

[0060] Components Mass percentage (Wt%) Low temperature paraffin 84.6 Solid lubricant 5.3 Precipitant 4.6 Thickener 4.75 Dispersants 0.75

[0061] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 14 parts of polytetrafluoroethylene and 2 parts of hexagonal boron nitride powder, the precipitant is polyacrylamide, the viscosity agent is hydroxymethyl cellulose, and the dispersant is polyoxyethylene octyl alcohol ether.

[0062] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0063] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0064] Step 2: Put the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio of 1:3, ball milling speed of 280r / min, and ball milling time of 85 minutes;

[0065] Step 3: Heat the low-temperature paraffin weighed in step 1 to 100° C. to completely melt it into liquid paraffin, and keep it at a constant temperature of 100° C.;

[0066] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 100° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0067] Step 5: While maintaining the temperature at 100° C., add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0068] Example 5

[0069] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 5 below.

[0070] Table 5 shows the dosage of each raw material component of the lubricant in Example 5

[0071] Components Mass percentage (Wt%) Low temperature paraffin 94.2 Solid lubricant 2.3 Precipitant 1.25 Thickener 1.6 Dispersants 0.65

[0072] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 14 parts of polytetrafluoroethylene and 2 parts of hexagonal boron nitride powder, the precipitant is polyacrylamide, the viscosity agent is hydroxymethyl cellulose, and the dispersant is polyoxyethylene octyl alcohol ether.

[0073] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0074] Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage;

[0075] Step 2: The solid lubricating material and dispersant weighed in the above step 1 are placed in a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio of 1:3, ball milling speed of 320 r / min, and ball milling time of 60 minutes;

[0076] Step 3: Heat the low-temperature paraffin weighed in step 1 to 100° C. to completely melt it into liquid paraffin, and keep it at a constant temperature of 100° C.;

[0077] Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 100° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent;

[0078] Step 5: While maintaining the temperature at 100° C., add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0079] Comparative Example 1

[0080] This comparative example is basically the same as Example 2, except that in this comparative example, the inorganic electrolyte NaCl is used to replace polyacrylamide as the precipitant.

[0081] Comparative Example 2

[0082] A cooling and heat dissipating lubricant for diamond drill bits, with the formula and dosage shown in Table 6 below.

[0083] Table 6 shows the dosage of each raw material component of the lubricant in Comparative Example 2

[0084] Components Mass percentage (Wt%) Low temperature paraffin 89 Solid lubricant 7.3 Thickener 3 Dispersants 0.7

[0085] Among them, the low-temperature paraffin is polyethylene wax, the solid lubricating material is prepared by mixing 12 parts of polytetrafluoroethylene and 4 parts of hexagonal boron nitride powder, the viscosity agent is a mixture of polyvinyl alcohol and hydroxymethyl cellulose in a mass ratio of 1:1, and the dispersant is a mixture of hexadecyltrimethylammonium chloride and polyoxyethylene octyl alcohol ether in a mass ratio of 2:1.

[0086] A preparation process of a cooling and heat dissipation lubricant for a diamond drill bit comprises the following steps:

[0087] Step 1: Weigh low-temperature paraffin, solid lubricating material, thickener, and dispersant according to mass percentage;

[0088] Step 2: Put the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material. The ball milling parameters are: abrasive ratio of 1:3, ball milling speed of 300 r / min, and ball milling time of 80 minutes;

[0089] Step 3: Heat the low-temperature paraffin weighed in step 1 to 100° C. to completely melt it into liquid paraffin, and keep it at a constant temperature of 100° C.;

[0090] Step 4: while maintaining the temperature at 100° C., adding the modified solid lubricating material prepared in step 2 into the melted liquid paraffin, stirring evenly, to form a liquid paraffin lubricating heat dissipating agent;

[0091] Step 5: While maintaining the temperature at 100° C., add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

[0092] Performance Testing

[0093] The cooling and heat dissipation lubricants prepared in the above Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests. The prepared lubricants were marked as Example 1, Example 2, Example 3, Example 4, Example 5, Comparative Example 1, and Comparative Example 2, respectively. The performance of Examples 1-5 and Comparative Examples 1-2 was tested, and the specific testing methods and test items are as follows:

[0094] 1. Stability precipitation test: Take 10 ml of cooling and heat dissipation lubricant from Example 1, Example 2, Example 3, Example 4, Example 5, Comparative Example 1 and Comparative Example 2 respectively, and gradually add 5 g of diamond powder to the lubricant according to concentrations such as 1%, 5%, and 10%. After adding the stone powder, gently stir the mixture to ensure uniform distribution. Let the mixture stand at room temperature and record whether precipitation, floccules or stratification occurs after 48 hours.

[0095] 2. Wear test: According to SHT0190-1992 liquid lubricant friction coefficient determination method (MM-200 method), under the maximum load capacity of the testing machine (10kN), the test time reaches 150s.

[0096] 3. Fluidity test: Use a rotational viscometer to evaluate the fluidity of the cooling lubricant at different temperatures and pressures and measure its plastic viscosity value.

[0097] 4. Lubricity test: Use an extreme pressure lubricator to evaluate the lubrication performance of the lubricant under high load, that is, the extreme pressure lubrication performance, and measure its extreme pressure lubrication coefficient.

[0098] The data obtained from the above tests are recorded in Table 7.

[0099] Table 7

[0100]

[0101]

[0102] From the data shown in Table 5, it can be seen that the lubricants prepared in Examples 1-5 have better stability. Examples 1, 2, 3, 4, and 5 do not show precipitation, floccules or stratification, indicating that they show good stability after adding diamond powder. This shows that these lubricants have good dispersibility and stability during use and are suitable for practical applications. Although Comparative Example 1 does not show precipitation and stratification, it shows that floccules appear, indicating that the stability of the lubricant prepared by using an inorganic electrolyte as a precipitant is insufficient, which may affect the use effect and performance.

[0103] From the data shown in Table 5, it can be seen that the lubricants prepared in Examples 1-5 have a lower friction coefficient, a lower plastic viscosity, and a lower extreme pressure lubrication coefficient, which indicates that the lubricant prepared by the present invention has a better lubrication effect, better fluidity at higher temperatures, can withstand higher pressures, and has better extreme pressure lubrication performance.

[0104] The invention enhances the dispersibility of the solid lubricating material in the liquid paraffin by adding polyacrylamide as a precipitant, prevents the material from precipitating or agglomerating, and thus enhances the stability and uniformity of the lubricant.

[0105] Based on the performance of the above indicators, the cooling and heat dissipation lubricant prepared by the present invention exhibits good stability, low friction coefficient, good fluidity and extreme pressure lubrication performance, and is suitable for the application of diamond drill bits. The above examples illustrate that the cooling and heat dissipation lubricant for diamond drill bits and the preparation process provided in the present invention have better market application prospects.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cooling and heat dissipation lubricant for a diamond drill bit, characterized in that: The following ingredients are included in percentage by mass:

2. The cooling and heat dissipation lubricant for diamond drill bits according to claim 1, characterized in that: The low temperature paraffin wax is specifically one of polyethylene wax and polypropylene wax.

3. The cooling and heat dissipation lubricant for diamond drill bits according to claim 1, characterized in that: The solid lubricating material is made of the following raw materials in parts by weight: 5 to 20 parts of polytetrafluoroethylene and 1 to 5 parts of hexagonal boron nitride powder.

4. The cooling and heat dissipation lubricant for diamond drill bits according to claim 1, characterized in that: The precipitant is polyacrylamide.

5. The cooling and heat dissipation lubricant for diamond drill bits according to claim 1, characterized in that: The thickener is one or more of polyvinyl alcohol and hydroxymethyl cellulose.

6. The cooling and heat dissipation lubricant for diamond drill bits according to claim 1, characterized in that: The dispersant is one or more of hexadecyltrimethylammonium chloride and polyoxyethylene octyl alcohol ether.

7. A process for preparing a cooling and heat dissipating lubricant for a diamond drill bit according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Weigh low-temperature paraffin, solid lubricating material, precipitant, thickener, and dispersant according to mass percentage; Step 2: placing the solid lubricating material and dispersant weighed in the above step 1 into a three-dimensional vibration ball mill for sufficient mechanical ball milling to form a modified solid lubricating material; Step 3: Heat the low-temperature paraffin weighed in step 1 to 80°C to 120°C to completely melt it into liquid paraffin, and maintain it at a constant temperature of 80°C to 120°C; Step 4: adding the modified solid lubricating material and the precipitant prepared in step 2 to the melted liquid paraffin while maintaining the temperature at 80° C. to 120° C., stirring evenly to form a liquid paraffin lubricating heat dissipating agent; Step 5: While maintaining the temperature at 80°C to 120°C, add the viscous agent weighed in step 1 to the liquid paraffin lubricant prepared in step 4, stir evenly to obtain a mixture, and cool the mixture to room temperature to obtain a cooling lubricant.

8. The process for preparing a cooling and heat dissipating lubricant for a diamond drill bit according to claim 7, characterized in that: The ball milling parameters in step 2 are: abrasive ratio is 1:(1-5), ball milling speed is 200-400r / min, and ball milling time is 20-120 minutes.

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