High-toughness polyurethane lubricating material, and preparation method and application thereof

Abstract

The application belongs to the technical field of lubricating materials, and particularly relates to a high-strength and high-toughness polyurethane lubricating material, a preparation method thereof and application. The application mainly improves the mechanical properties and tribological properties of the material by introducing hydrogen bond interaction and rigid units. Hydrogen bond is a weak interaction force, but on the material level, by skillfully designing the polyurethane molecular structure, a strong hydrogen bond network can be formed, thereby significantly improving the strength and toughness of the material. The introduction of rigid units helps to enhance the rigidity of the material and plays a reinforcing role in the hydrogen bond network. This rigid unit interacts with the hydrogen bond to form a synergistic effect. In addition, by introducing hydrogen bonds and rigid units, the polyurethane water lubricating material also achieves significant improvement in tribological properties. The high-strength and high-toughness polyurethane lubricating material provided by the application has better wear resistance and lower friction coefficient, so that it has a wide application prospect in the field of tribology.

Description

Technical Field

[0001] This invention belongs to the field of lubrication material technology, specifically relating to a high-strength and tough polyurethane lubricating material, its preparation method, and its application. Background Technology

[0002] With the continuous advancement of technology, high strength, high toughness, and excellent tribological properties have become indispensable key characteristics in the field of materials science, especially in the application of polyurethane water-lubricated materials. Polyurethane materials possess excellent wear resistance, a wide hardness range, high elasticity, high load-bearing capacity, fatigue resistance, vibration damping ability, and good oil and solvent resistance, making them one of the current research hotspots in water-lubricated bearing materials.

[0003] However, traditional polyurethane materials have limitations in mechanical and tribological properties. Therefore, researchers have been seeking new methods to improve the tribological and mechanical properties of these materials. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength and high-toughness polyurethane lubricating material, its preparation method and application. The polyurethane lubricating material provided by this invention has high strength and high toughness as well as excellent tribological properties, and has broad application potential in the field of tribology.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for preparing a high-strength and tough polyurethane lubricating material, comprising the following steps:

[0007] Polycarbonate diol, organic solvent, catalyst, hexamethylene diisocyanate and p-aminobenzoylaminobenzamide are mixed and polymerized to obtain the high-strength and tough polyurethane lubricating material.

[0008] Preferably, the M of the polycarbonate diol n For ~2000.

[0009] Preferably, the ratio of the polycarbonate diol to the hexamethylene diisocyanate is 5g:(0.6-1.2)mL.

[0010] Preferably, the mass ratio of the polycarbonate diol to the p-aminobenzoylaminobenzamide is 5:(0.32-1.28).

[0011] Preferably, the catalyst is an organotin catalyst, and the ratio of the polycarbonate diol to the catalyst is 5g:(40-90)μL.

[0012] Preferably, the organic solvent includes one or more of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone.

[0013] Preferably, the polymerization reaction is carried out at a temperature of 60–80°C in a protective gas atmosphere.

[0014] Preferably, the polymerization reaction includes the following steps: mixing polycarbonate diol, a portion of organic solvent, catalyst and hexamethylene diisocyanate to carry out a first-stage reaction to obtain a first-stage reaction solution; mixing the first-stage reaction solution, p-aminobenzoylaminobenzamide and the remaining organic solvent to carry out a second-stage reaction; the first-stage reaction time is 2-4 hours, and the second-stage reaction time is 12-8 hours.

[0015] This invention provides a high-strength and tough polyurethane lubricating material prepared by the preparation method described in the above technical solution.

[0016] This invention provides the application of the high-strength and tough polyurethane lubricating material described in the above technical solution in the preparation of wear-resistant materials.

[0017] This invention provides a method for preparing a high-strength and tough polyurethane lubricating material, comprising the following steps: mixing polycarbonate diol, an organic solvent, a catalyst, hexamethylene diisocyanate, and p-aminobenzoylaminobenzamide for a polymerization reaction to obtain the high-strength and tough polyurethane lubricating material. The preparation method provided by this invention mainly improves the mechanical and tribological properties of the material by introducing hydrogen bonding interactions and rigid units (unit structures formed by aminobenzoylaminobenzamide). Hydrogen bonds are a weak interaction force, but at the material level, through clever design of the polyurethane molecular structure, a strong hydrogen bond network can be formed, thereby significantly improving the strength and toughness of the material. Introducing rigid units helps to enhance the rigidity of the material and plays a reinforcing role in the hydrogen bond network. These rigid units interact with hydrogen bonds, forming a synergistic effect. Furthermore, through the introduction of hydrogen bonds and rigid units, this invention also achieves significant improvements in the tribological properties of the polyurethane water-lubricating material. The high-strength and tough polyurethane lubricating material provided by this invention has better wear resistance and a lower coefficient of friction, making it promising for broad applications in the field of tribology.

[0018] This invention provides a high-strength and high-toughness polyurethane lubricating material prepared by the method described above. The high-strength and high-toughness polyurethane water lubricating material provided by this invention successfully overcomes the limitations of traditional polyurethane materials through hydrogen bonding interactions and the introduction of rigid units. Its excellent mechanical and tribological properties give it broad application potential. Detailed Implementation

[0019] This invention provides a method for preparing a high-strength and tough polyurethane lubricating material, comprising the following steps:

[0020] Polycarbonate diol, organic solvent, catalyst, hexamethylene diisocyanate and p-aminobenzoylaminobenzamide are mixed and polymerized to obtain the high-strength and tough polyurethane lubricating material.

[0021] In this invention, unless otherwise specified, all raw materials / components used in the preparation are commercially available products well known to those skilled in the art.

[0022] In this invention, the M of the polycarbonate diol n Preferably, the concentration is ~2000. The organic solvent preferably includes one or more of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone, more preferably N,N-dimethylformamide. The catalyst is preferably an organotin catalyst, specifically dibutyltin dilaurate. The polycarbonate diol is preferably purchased from Jining Hongming Chemical Reagent Co., Ltd. The dibutyltin dilaurate and hexamethylene diisocyanate are preferably purchased from Anhui Zesheng Technology Co., Ltd. The p-aminobenzoylaminobenzamide is preferably purchased from Zhengzhou Alpha Chemical Co., Ltd.

[0023] In this invention, the preferred ratio of polycarbonate diol to hexamethylene diisocyanate is 5 g:(0.6–1.2) mL, specifically 5 g:0.6 mL, 5 g:0.7 mL, 5 g:0.8 mL, 5 g:1 mL, or 5 g:1.2 mL. The preferred mass ratio of polycarbonate diol to p-aminobenzoylaminobenzamide is 5:(0.32–1.28), specifically 5:0.32, 5:0.48, 5:0.64, 5:0.96, or 5:1.28. The preferred ratio of polycarbonate diol to catalyst is 5 g:(40–90) μL, more preferably 5 g:(50–75) μL.

[0024] In this invention, prior to the polymerization reaction, the polycarbonate diol is preferably dried. The drying is preferably vacuum drying, with a preferred temperature of 100–130°C and a preferred drying time of 4–6 hours.

[0025] In this invention, the polymerization reaction temperature is preferably 60–80°C, and the polymerization reaction is preferably carried out in a protective gas atmosphere, preferably nitrogen. The polymerization reaction preferably includes the following steps: mixing polycarbonate diol, a portion of the organic solvent, a catalyst, and hexamethylene diisocyanate for a first-stage reaction to obtain a first-stage reaction solution; mixing the first-stage reaction solution, p-aminobenzoylaminobenzamide, and the remaining organic solvent for a second-stage reaction. The preferred order of mixing the polycarbonate diol, the portion of the organic solvent, the catalyst, and the hexamethylene diisocyanate is: dissolving the polycarbonate diol in the portion of the organic solvent to obtain a polycarbonate diol solution; adding the catalyst dropwise to the polycarbonate diol solution, stirring until homogeneous, and then adding the hexamethylene diisocyanate. The preferred ratio of polycarbonate diol to the portion of the organic solvent is 5 g:(30–60) mL. The preferred temperature for the first-stage reaction is 60–80°C, and the preferred time is 2–4 h. The preferred order for mixing the first-stage reaction solution, p-aminobenzoylaminobenzamide, and the remaining organic solvent is as follows: dissolving p-aminobenzoylaminobenzamide in the remaining organic solvent to obtain a p-aminobenzoylaminobenzamide solution; adding the p-aminobenzoylaminobenzamide solution to the first-stage reaction solution. The preferred ratio of p-aminobenzoylaminobenzamide to the remaining organic solvent is (0.32–1.28) g : (10–40) mL. The preferred temperature for the second-stage reaction is 60–80°C, and the preferred time is 12–8 h.

[0026] After the polymerization reaction is completed, the present invention preferably removes the solvent from the obtained polymerization product to obtain the high-strength and tough polyurethane lubricating material. The present invention does not have specific requirements for the specific implementation method of solvent removal.

[0027] This invention provides a high-strength and tough polyurethane lubricating material prepared by the preparation method described in the above technical solution.

[0028] The chemical structure of the high-strength and tough polyurethane lubricating material prepared by this invention is shown in Formula 1:

[0029]

[0030] In Equation 1: n = ~6; m is the degree of aggregation.

[0031] This invention provides the application of the high-strength and tough polyurethane lubricating material described in the above-mentioned technical solution in the preparation of wear-resistant materials. This invention does not specify particular implementation methods for the described application.

[0032] To further illustrate the present invention, the technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0033] The sources of the main raw materials used in the following examples and comparative examples are as follows:

[0034] Polycarbonate diol from Jining Hongming Chemical Reagent Co., Ltd. was used.

[0035] Dibutyltin dilaurate and hexamethylene diisocyanate from Anhui Zesheng Technology Co., Ltd. were used.

[0036] p-Aminobenzoylaminobenzamide from Zhengzhou Alpha Chemical Co., Ltd. was used.

[0037] In the following examples and comparative examples, the chemical reactions were all carried out in a nitrogen atmosphere at a temperature of 60°C.

[0038] Example 1

[0039] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0040] (2) Measure 0.60 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0041] (3) Weigh 0.32 g of p-aminobenzoylaminobenzamide and dissolve it in 20 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0042] Example 2

[0043] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0044] (2) Measure 0.70 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0045] (3) Weigh 0.48 g of p-aminobenzoylaminobenzamide and dissolve it in 20 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0046] Example 3

[0047] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0048] (2) Measure 0.80 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0049] (3) Weigh 0.64 g of p-aminobenzoylaminobenzamide and dissolve it in 30 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0050] Example 4

[0051] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0052] (2) Measure 1.00 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0053] (3) Weigh 0.96 g of p-aminobenzoylaminobenzamide and dissolve it in 40 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0054] Example 5

[0055] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0056] (2) Measure 1.20 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0057] (3) Weigh 1.28 g of p-aminobenzoylaminobenzamide and dissolve it in 40 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0058] Comparative Example 1

[0059] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0060] (2) Measure 1.40 mL of hexamethylene diisocyanate and add it to a three-necked flask to react for 2 h.

[0061] (3) Weigh 1.60 g of p-aminobenzoylaminobenzamide and dissolve it in 20 mL of N,N-dimethylformamide. After adding the solvent, react for 15 h. Finally, remove the solvent to obtain polyurethane.

[0062] Comparative Example 2

[0063] (1) Weigh 5.00g of polycarbonate diol and place it in a three-necked flask. After vacuum drying in an oven at 120℃ for 3 hours, take it out and add 40mL of N,N-dimethylformamide and 5 drops (1 drop has a volume of 10-15 μL) of dibutyltin dilaurate. Stir well.

[0064] (2) Measure 0.40 mL of hexamethylene diisocyanate, add it to a three-necked flask and react for 2 h. Finally, remove the solvent to obtain polyurethane.

[0065] Test case

[0066] (1) Friction and wear test conditions: The friction and wear performance was tested using a high-speed ring-block friction and wear tester. The mating material was 45# steel, the test load was 200N, the rotation speed was 200rpm, the running time was 2h, and the lubrication condition was water lubrication. The friction coefficient and wear rate were the average values ​​of 2 to 3 tests.

[0067] (2) Mechanical property testing conditions: The mechanical properties were tested using an electronic universal tensile testing machine. The test was conducted at room temperature. Samples were prepared according to ISO527-2 / 1BB standard, and the tensile rate was 10 mm / min.

[0068] Table 1 shows the tribological and mechanical properties of Examples 1-5 and Comparative Examples 1-2. Example 1 exhibits superior mechanical properties compared to the other examples and comparative examples, with a stress of 48.8 MPa, an elongation at break of 1352.9%, and a toughness of 263.9 MJ / m. 3 The coefficient of friction is 0.014, and the wear rate is 5.45 × 10⁻⁶. -6 mm 3 / Nm. The results show that the mechanical and tribological properties of polyurethane are closely related to the content of chain extender. Generally, increasing the amount of chain extender leads to the growth of polyurethane chains, thereby changing the molecular structure and properties of the material. Therefore, a reasonable chain extender ratio is crucial for improving the tribological and mechanical properties of polyurethane.

[0069] Table 1 Mechanical and tribological properties of polyurethane

[0070]

[0071] As can be seen from the above embodiments, the preparation method provided by the present invention prepares a novel high-strength and high-toughness polyurethane water lubricating material by introducing hydrogen bonding interactions and rigid units. It has high strength, high toughness and excellent tribological properties, and has broad application potential in the field of tribology.

[0072] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, not all embodiments. Other embodiments can be obtained based on these embodiments without creative intent, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for preparing a high-strength and tough polyurethane lubricating material, characterized in that, Includes the following steps: Polycarbonate diol, organic solvent, catalyst, hexamethylene diisocyanate, and p-aminobenzoylaminobenzamide are mixed and polymerized to obtain the high-strength and tough polyurethane lubricating material; the ratio of polycarbonate diol to hexamethylene diisocyanate is 5 g: (0.6~1.2) mL; the mass ratio of polycarbonate diol to p-aminobenzoylaminobenzamide is 5: (0.32~1.28).

2. The preparation method according to claim 1, characterized in that, The M of the polycarbonate diol n Approximately 2000.

3. The preparation method according to claim 1, characterized in that, The catalyst is an organotin catalyst, and the ratio of polycarbonate diol to the catalyst is 5g:(40~90)μL.

4. The preparation method according to claim 1, wherein the organic solvent comprises one or more of N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone.

5. The preparation method according to claim 1, characterized in that, The polymerization reaction is carried out at a temperature of 60~80℃ in a protective gas atmosphere.

6. The preparation method according to claim 1 or 5, characterized in that, The polymerization reaction includes the following steps: mixing polycarbonate diol, a portion of organic solvent, catalyst and hexamethylene diisocyanate to carry out a first-stage reaction to obtain a first-stage reaction solution; mixing the first-stage reaction solution, p-aminobenzoylaminobenzamide and the remaining organic solvent to carry out a second-stage reaction; the first-stage reaction time is 2-4 hours, and the second-stage reaction time is 12-8 hours.

7. The high-strength and tough polyurethane lubricating material prepared by the preparation method according to any one of claims 1 to 6.

8. The application of the high-strength and tough polyurethane lubricating material according to claim 7 in the preparation of wear-resistant materials.

Images