Wear-resistant self-lubricating material for ship stern bearing and preparation method of wear-resistant self-lubricating material

Abstract

The invention relates to a wear-resistant self-lubricating material for a ship stern bearing and a preparation method of the wear-resistant self-lubricating material. The method comprises the following steps: S1, blending polytetrafluoroethylene and dopamine to form a mixture A1, grinding for multiple times, putting the mixture A1 into a mold, carrying out compression molding to obtain a product A2, carrying out post-curing treatment on the product A2 to obtain a product A3, and processing the product A3 into a film to obtain a product A4; s2, basalt fibers are soaked in polytetrafluoroethylene emulsion and dried, and a product B is obtained; s3, carbon fibers are soaked in lubricating oil, a product C1 is obtained, then graphite powder and the product C1 are blended, and a product C2 is obtained; s4, blending the product B and the product C2 to obtain a product D, mixing the product D with p-phenylene diisocyanate, perfluoropolyether alcohol, perfluoropolyether glycol and acetone in proportion, and preparing a product E through an electrostatic spinning process; and S5, alternately laying the products A4 and E, and bonding the layers by using an adhesive F to obtain the product. The method has the advantages that the method is simple, the production cost is low, the period is short, and the prepared self-lubricating material is excellent in performance.

Description

Technical Field

[0001] The invention relates to the technical field of new self-lubricating materials and ship stern bearings, and in particular to a wear-resistant self-lubricating material for a ship stern bearing and a preparation method thereof. Background Art

[0002] The materials used for ship stern bearings are generally water-lubricated rubber materials or water-lubricated plastic materials. Water-lubricated rubber materials are often used for ship stern bearings with small load shaft systems, and water-lubricated plastic materials are often used for ship stern bearings with large load shaft systems. With the increase in ship tonnage, the load on ship shaft systems is getting bigger and bigger, and there are more and more types of water-lubricated plastic materials for ship stern bearings. The water-lubricated plastic materials for ship stern bearings include polyetheretherketone, polyurethane, polytetrafluoroethylene, unsaturated polyester, polyphenylene ether, polyphenylene ester, etc. Among them, polytetrafluoroethylene has a small friction coefficient and excellent self-lubricating properties, so it is widely used in ship stern bearings.

[0003] However, although polytetrafluoroethylene has a small friction coefficient and excellent self-lubricating properties, its wear resistance is poor and its size changes greatly with temperature. For this reason, scientists often use nanofillers and polymer materials to modify and enhance polytetrafluoroethylene to improve its wear resistance and dimensional stability. These methods can improve the wear resistance and dimensional stability of polytetrafluoroethylene, but the effect is limited and still cannot meet the use requirements of ship stern bearings. Summary of the invention

[0004] The present invention provides a wear-resistant self-lubricating material for a ship stern bearing and a preparation method thereof, aiming to overcome the above-mentioned deficiencies in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A method for preparing a wear-resistant self-lubricating material for a ship stern bearing, which comprises the following steps, wherein each raw material is calculated by weight:

[0006] S1. 100 parts of polytetrafluoroethylene powder and 5-15 parts of dopamine are blended and stirred to form a mixture A1, the mixture A1 is ground several times at 25°C-50°C by a grinding device, and then the ground material is placed in a mold, and molded at 180°C and 15MPa for 50 hours to obtain product A2, and finally product A2 is post-cured at 250°C for 15 hours to obtain product A3, and product A3 is processed into a film with a thickness of 0.3-0.5mm to obtain product A4;

[0007] S2. 8 parts of chopped basalt fibers were fully immersed in 200-300 parts of polytetrafluoroethylene emulsion and then dried by a dryer to obtain product B;

[0008] S3. 15 parts of chopped carbon fibers were fully immersed in 50-80 parts of lubricating oil to obtain product C1, and then 15 parts of graphite powder were added to product C1 and blended to obtain product C2;

[0009] S4. 1 part of product B and 1 part of product C2 were blended to obtain product D, and product D was mixed with 50 parts of p-phenylene diisocyanate, 4 parts of perfluoropolyether alcohol, 26 parts of perfluoropolyether diol and 80 parts of acetone and prepared by electrospinning process to obtain product E with a film thickness of 0.3-0.5 mm;

[0010] S5. Alternately lay product A4 and product E, and bond each layer with adhesive F to obtain a self-lubricating material for a ship stern bearing.

[0011] On the basis of the above technical solutions, the present invention can also make the following further specific selections or more preferred selections.

[0012] Specifically, the particle size of the polytetrafluoroethylene powder in S1 is 50-200 μm, and it is mixed with dopamine at a temperature below room temperature. Sufficient stirring means controlling the rotation speed to 60-300 r / min and stirring for 8-12 hours.

[0013] Specifically, the grinding equipment in S1 is a three-roller grinder, and the number of grinding times is controlled to be more than 3 times.

[0014] Specifically, the product A3 in S1 is cut into a film by a machine tool.

[0015] Specifically, the specification of the short-cut basalt fiber in S2 is 1-5 μm, and sufficient soaking means controlling the soaking temperature to 80-85° C. and soaking for more than 48 hours.

[0016] Specifically, the polytetrafluoroethylene suspension in S2 is JF-4DCD.

[0017] Specifically, the specification of the short-cut carbon fiber in S3 is 1-5 μm, and sufficient soaking means controlling the soaking temperature to 30-35° C. and soaking for more than 72 hours; the particle size of the graphite powder in S3 is 25-30 μm; and the lubricating oil in S3 is tung oil or silicone oil.

[0018] Specifically, the specific parameters of the electrospinning process in S4 are to control the temperature to 60°C, the voltage to 30 kV, and the flow rate to 1 mL / s.

[0019] Specifically, the adhesive F in S5 is a blend of isophorone diisocyanate and perfluoropolyether diol in a weight ratio of 100:25, and the thickness of the adhesive layer formed by the adhesive F is 0.3-0.5 mm.

[0020] The present invention also provides a wear-resistant self-lubricating material for a ship stern bearing, which is prepared by the above method.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] Basalt fiber and carbon fiber have excellent mechanical properties, and can improve the mechanical properties and wear resistance of polymer materials in polymer materials, but basalt and carbon fiber will also increase the friction coefficient of the material. The present invention creatively adsorbs and blends polytetrafluoroethylene solution and lubricating oil with basalt fiber and carbon fiber, and the obtained fiber material can not only strengthen the polymer material, but also reduce the friction coefficient; polybutadiene material has excellent mechanical properties, dimensional stability and compatibility, and interpenetrating network blending with polytetrafluoroethylene material can retain the self-lubricating property of polytetrafluoroethylene and improve the dimensional stability of polytetrafluoroethylene material; product A4 and product E are alternately layered and the layers are bonded with adhesive F, and the formed composite material forms a composite synergistic effect on the friction surface, polytetrafluoroethylene, lubricating oil and graphite are used to achieve a low friction coefficient, basalt fiber and carbon fiber are used to strengthen the electrostatic spinning membrane, improve the mechanical strength and wear resistance, and the bonding layer formed by adhesive F with excellent elasticity is used to achieve lateral dimensional stability when the temperature changes.

[0023] The method of the invention is simple, does not require harsh reaction conditions, has low production cost and short cycle, and the prepared wear-resistant, low-friction-coefficient, dimensionally stable self-lubricating material has excellent mechanical properties, wear resistance and dimensional stability, is particularly suitable for the manufacture of ship stern bearings, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of a wear-resistant self-lubricating material for a ship stern bearing prepared by the present invention. The upper surface indicated by the arrow at H in the figure represents a friction surface of the self-lubricating material, F represents an adhesive layer, A4 is the product A4 prepared in step S1, and E is the product E prepared in step S4. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] To avoid redundant description, the raw materials used in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods in the art unless otherwise specified.

[0027] The polytetrafluoroethylene emulsion used in the following examples is purchased from Zhejiang Juhua, with the brand name JF-4DCD. The particle size of the polytetrafluoroethylene powder is 50-200 μm, and the particle size of the graphite powder is 25-30 μm. In the following examples, when a three-roll mill is used for grinding three times, it is preferred that the first grinding time is controlled at 25-30°C, the second grinding time is controlled at 35-40°C, and the third grinding time is controlled at 45-50°C. The grinding time for each grinding time is controlled at 1-2h. The three-roll mill model is preferably S150, with a power of about 2.2kW and a rotation speed of about 1420r / min.

[0028] Example 1

[0029] A wear-resistant self-lubricating material for a ship stern bearing, the preparation method of which comprises the following steps, each raw material being calculated by weight:

[0030] S1. 100 parts of polytetrafluoroethylene powder were blended with 5 parts of dopamine at room temperature or below, the speed was controlled at 60-140 r / min, and stirred for 11-12 hours to form a mixture A1, the mixture A1 was ground three times by a three-roll grinder at 25°C-50°C, and then the ground material was placed in a mold, and the molded product was molded at 180°C and 15MPa for 50 hours under pressure and heat preservation to obtain product A2, and finally product A2 was post-cured at 250°C for 15 hours to obtain product A3, and product A3 was processed on a machine tool into a film with a thickness of 0.3-0.5mm to obtain product A4;

[0031] S2. 8 parts of chopped basalt fibers of 1-5 μm in 200 parts of polytetrafluoroethylene emulsion were fully immersed at a temperature of 80 ° C for 48 hours and then dried in a dryer to obtain product B;

[0032] S3. 15 parts of chopped carbon fibers of 1-5 μm in size were fully immersed in 50 parts of lubricating oil (tung oil), and the immersion temperature was controlled at 30 ° C. The mixture was immersed for 72 hours to obtain product C1, and then 15 parts of graphite powder were added to the obtained product C1, and the mixture was blended to obtain product C2;

[0033] S4. 1 part of product B and 1 part of product C2 are blended to obtain product D, and the obtained product D is mixed with 50 parts of p-phenylene diisocyanate, 4 parts of perfluoropolyether alcohol, 26 parts of perfluoropolyether diol and 80 parts of acetone, and a product E having a film thickness of 0.3-0.5 mm is obtained by an electrospinning process, wherein the temperature is controlled at 60°C, the voltage is 30 kV, and the flow rate is 1 mL / s during electrospinning;

[0034] S5. Product A4 and product E are alternately layered, and the layers are bonded with adhesive F to obtain a self-lubricating material for a ship stern bearing. The adhesive F is a blend of isophorone diisocyanate and perfluoropolyether diol in a weight ratio of 100:25. The thickness of the bonding layer formed by the adhesive F is 0.3-0.5 mm.

[0035] Example 2

[0036] A wear-resistant self-lubricating material for a ship stern bearing, the preparation method of which comprises the following steps, each raw material being calculated by weight:

[0037] S1. 100 parts of polytetrafluoroethylene powder were blended with 10 parts of dopamine at room temperature or below, the speed was controlled at 140-210 r / min, and stirred for 10-11 hours to form a mixture A1, the mixture A1 was ground three times by a three-roll grinder at 25°C-50°C, and then the ground material was placed in a mold, and the molded product was molded at 180°C and 15MPa for 50 hours under pressure and heat preservation to obtain product A2, and finally product A2 was post-cured at 250°C for 15 hours to obtain product A3, and product A3 was processed on a machine tool into a film with a thickness of 0.3-0.5mm to obtain product A4;

[0038] S2. 8 parts of chopped basalt fibers of 1-5 μm in 250 parts of polytetrafluoroethylene emulsion were fully immersed at a temperature of 80 ° C for 48 hours and then dried in a dryer to obtain product B;

[0039] S3. 15 parts of chopped carbon fibers of 1-5 μm in size were fully immersed in 60 parts of lubricating oil (tung oil), and the immersion temperature was controlled at 30 ° C. The mixture was immersed for 72 hours to obtain product C1, and then 15 parts of graphite powder were added to the obtained product C1, and the mixture was blended to obtain product C2;

[0040] S4. 1 part of product B and 1 part of product C2 are blended to obtain product D, and the obtained product D is mixed with 50 parts of p-phenylene diisocyanate, 4 parts of perfluoropolyether alcohol, 26 parts of perfluoropolyether diol and 80 parts of acetone, and a product E having a film thickness of 0.3-0.5 mm is obtained by an electrospinning process, wherein the temperature is controlled at 60°C, the voltage is 30 kV, and the flow rate is 1 mL / s during electrospinning;

[0041] S5. Product A4 and product E are alternately layered, and the layers are bonded with adhesive F to obtain a self-lubricating material for a ship stern bearing. The adhesive F is a blend of isophorone diisocyanate and perfluoropolyether diol in a weight ratio of 100:25. The thickness of the bonding layer formed by the adhesive F is 0.3-0.5 mm.

[0042] Example 3

[0043] A wear-resistant self-lubricating material for a ship stern bearing, the preparation method of which comprises the following steps, each raw material being calculated by weight:

[0044] S1. 100 parts of polytetrafluoroethylene powder and 15 parts of dopamine were blended below room temperature, the speed was controlled at 210-300 r / min, and stirred for 8-9 hours to form a mixture A1, the mixture A1 was ground three times at 25°C-50°C by a three-roll grinder, and then the ground material was placed in a mold, and the molded product was molded at 180°C and 15MPa for 50 hours under pressure and heat preservation to obtain product A2, and finally product A2 was post-cured at 250°C for 15 hours to obtain product A3, and product A3 was processed on a machine tool into a film with a thickness of 0.3-0.5mm to obtain product A4;

[0045] S2. 8 parts of chopped basalt fibers of 1-5 μm in 300 parts of polytetrafluoroethylene emulsion were fully immersed at a temperature of 80 ° C for 48 hours and then dried in a dryer to obtain product B;

[0046] S3. 15 parts of chopped carbon fibers of 1-5 μm in size were fully immersed in 80 parts of lubricating oil (tung oil), and the immersion temperature was controlled at 30 ° C. The mixture was immersed for 72 hours to obtain product C1, and then 15 parts of graphite powder were added to the obtained product C1, and the mixture was blended to obtain product C2;

[0047] S4. 1 part of product B and 1 part of product C2 are blended to obtain product D, and the obtained product D is mixed with 50 parts of p-phenylene diisocyanate, 4 parts of perfluoropolyether alcohol, 26 parts of perfluoropolyether diol and 80 parts of acetone, and a product E having a film thickness of 0.3-0.5 mm is obtained by an electrospinning process, wherein the temperature is controlled at 60°C, the voltage is 30 kV, and the flow rate is 1 mL / s during electrospinning;

[0048] S5. Product A4 and product E are alternately layered, and the layers are bonded with adhesive F to obtain a self-lubricating material for a ship stern bearing. The adhesive F is a blend of isophorone diisocyanate and perfluoropolyether diol in a weight ratio of 100:25. The thickness of the bonding layer formed by the adhesive F is 0.3-0.5 mm.

[0049] The basic structure of the self-lubricating material obtained in each embodiment is as follows Figure 1 As shown, after standing for three days, the friction coefficient, wear thickness and dimensional change rate at different temperatures were tested, and compared with the corresponding performance of conventional water-lubricated materials for bearings on the market. The results are shown in the following table:

[0050]

[0051] Comparison of the data in the above table shows that the friction performance, wear resistance and dimensional stability of the self-lubricating material provided by the present invention are significantly better than those of existing bearing water lubricating materials.

[0052] 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, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing a wear-resistant self-lubricating material for a ship stern bearing, characterized in that: The method comprises the following steps, wherein each raw material is calculated by weight: S1. 100 parts of polytetrafluoroethylene powder and 5-15 parts of dopamine are blended and stirred to form a mixture A1, the mixture A1 is ground several times at 25°C-50°C by a grinding device, and then the ground material is placed in a mold, and molded at 180°C and 15MPa for 50 hours to obtain product A2, and finally product A2 is post-cured at 250°C for 15 hours to obtain product A3, and product A3 is processed into a film with a thickness of 0.3-0.5mm to obtain product A4; S2. 8 parts of chopped basalt fibers were fully immersed in 200-300 parts of polytetrafluoroethylene emulsion and then dried by a dryer to obtain product B; S3. 15 parts of chopped carbon fibers were fully immersed in 50-80 parts of lubricating oil to obtain product C1, and then 15 parts of graphite powder were added to product C1 and blended to obtain product C2; S4. 1 part of product B and 1 part of product C2 were blended to obtain product D, and product D was mixed with 50 parts of p-phenylene diisocyanate, 4 parts of perfluoropolyether alcohol, 26 parts of perfluoropolyether diol and 80 parts of acetone and prepared by electrospinning process to obtain product E with a film thickness of 0.3-0.5 mm; S5. Alternately lay product A4 and product E, and bond each layer with adhesive F to obtain a water-lubricated material for a ship stern bearing.

2. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The particle size of the polytetrafluoroethylene powder in S1 is 50-200 μm, and it is mixed with dopamine at a temperature below room temperature. Sufficient stirring means controlling the rotation speed to 60-300 r / min and stirring for 8-12 hours.

3. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The grinding equipment in S1 is a three-roller grinder, and the number of grinding times is controlled to be more than 3 times.

4. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The product A3 in S1 is cut into a film by a machine tool.

5. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The specification of S2 medium-length chopped basalt fiber is 1-5μm. Full soaking means controlling the soaking temperature to 80-85℃ and soaking for more than 48h.

6. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The polytetrafluoroethylene suspension in S2 is JF-4DCD.

7. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The specification of the short-cut carbon fiber in S3 is 1-5μm. Full immersion means controlling the immersion temperature at 30-35°C and immersing for more than 72 hours. The particle size of the graphite powder in S3 is 25-30μm. The lubricating oil in S3 is tung oil or silicone oil.

8. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to claim 1, characterized in that: The specific parameters of the electrospinning process in S4 were a control temperature of 60 °C, a voltage of 30 kV, and a flow rate of 1 mL / s.

9. The method for preparing a wear-resistant self-lubricating material for a ship stern bearing according to any one of claims 1 to 8, characterized in that: The adhesive F in S5 is a blend of isophorone diisocyanate and perfluoropolyether diol in a weight ratio of 100:

25. The thickness of the adhesive layer formed by the adhesive F is 0.3-0.5 mm.

10. A wear-resistant self-lubricating material for a ship stern bearing, characterized in that: Prepared by the method according to any one of claims 1 to 9.

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