A self-lubricating polyurethane elastomer material and its preparation method and application

Abstract

The invention provides a self-lubricating polyurethane elastomer material and a preparation method and application thereof. The self-lubricating polyurethane elastomer material comprises the following components in parts by weight: 70-150 parts by weight of a polyurethane prepolymer, 20-50 parts by weight of a polyether polyol, 5-20 parts by weight of a chain extender, and 0.2-0.8 parts by weight of a catalyst. The self-lubricating polyurethane elastomer material prepared by the invention not only has a lower dynamic friction coefficient (dry friction) and a dynamic friction coefficient (hydraulic oil lubrication), but also when the ambient temperature rises, the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) do not increase significantly.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane seals, and in particular relates to a self-lubricating polyurethane elastomer material and a preparation method and application thereof. Background Art

[0002] Polyurethane (PU) is a polymer compound. Polyurethane materials have good interfacial adhesion and bonding properties, as well as high elongation, good elasticity, wear resistance, excellent weather resistance, low-temperature toughness, and long service life. As a result, polyurethane plastics, polyurethane fibers, polyurethane rubbers, and polyurethane elastomers made of polyurethane materials are widely used in the fields of home furnishing, construction, daily necessities, transportation, and home appliances.

[0003] With the development of my country's hydraulic and pneumatic industry, the use of seals has been increasing. Since the polyurethane elastomer structure contains extremely strong polar groups, hydrogen bonds can be formed within the polyurethane elastomer and between molecules. Under the action of hydrogen bonds, physical cross-linking can be produced inside the polyurethane elastomer, which makes the polyurethane elastomer have excellent wear resistance, mechanical properties, tear resistance, and oil resistance. It is widely used as a sealing material in hydraulic and control systems.

[0004] However, due to the presence of polar groups in the structure of polyurethane elastomer, the surface energy of polyurethane elastomer is relatively high. When sliding friction occurs, the dynamic friction coefficient is relatively large. When the seal is not lubricated enough, the local temperature of the product will be too high, resulting in extrusion or premature aging, shortening the service life of the seal. In severe cases, it will cause the hydraulic cylinder to vibrate, and eventually the seal will be extruded, causing failure.

[0005] Therefore, how to modify the polyurethane elastomer to reduce the dynamic friction coefficient when sliding friction occurs, and how to minimize the increase in the dynamic friction coefficient when the ambient temperature rises, are problems to be solved urgently in the present invention. Summary of the invention

[0006] The purpose of the present invention is to provide a self-lubricating polyurethane elastomer material and a preparation method and application thereof, so as to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: On the one hand, the present invention provides a self-lubricating polyurethane elastomer material, comprising the following components in parts by weight: 70-150 parts by weight of a polyurethane prepolymer (for example, it can be one of 70, 80, 90, 100, 110, 120, 130, 140 or 150 parts by weight), 20-50 parts by weight of a polyether polyol (for example, it can be one of 20, 24, 30, 40, 43, 47 or 50 parts by weight), 5-20 parts by weight of a chain extender (for example, it can be one of 5, 7, 8, 10, 13, 15 or 20 parts by weight), and 0.2-0.8 parts by weight of a catalyst (for example, it can be one of 0.2, 0.4, 0.5, 0.6, 0.7 or 0.8 parts by weight), wherein the polyether polyol is at least one of polyoxypropylene alcohol, polytetrahydrofuran diol, and tetrahydrofuran-oxypropylene copolymer diol, and the polyether polyol can be provided by Mitsubishi Chemical Corporation, for example;

[0008] As a further improvement, the raw materials for preparing the polyurethane prepolymer include polyol, fluorine-containing alcohol compound, isocyanate, terminal hydroxyl polybutadiene and dimethyl cyclosiloxane, wherein the terminal hydroxyl polybutadiene: M n =3500-4500 g / mol, for example, it can be obtained from Shandong Zibo Qilong Chemical Co., Ltd.

[0009] As a further improvement, the mass ratio of the polyol and the fluorine-containing alcohol complex is (4-6):1 (for example, it can be one of 4:1, 4.5:1, 5:1, 5.5:1 or 6:1), and the raw materials for preparing the fluorine-containing alcohol complex include dimethylcyclosiloxane, paraphenylene diisocyanate, hexafluorobutanol, and triethanolamine.

[0010] As a further improvement, the polyols are polyester polyols and polyethylene glycol, and the mass ratio of polyester polyols to polyethylene glycol is (2-5):1 (for example, it can be one of 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1 or 5:1).

[0011] As a further improvement, the polyester polyol is at least one of adipic acid-based polyester diol, phthalic anhydride-based polyester diol or alicyclic polyester diol, and the molecular weight of the polyester polyol is 3000-4000 (for example, it can be one of 3000, 3500 or 4000), and the molecular weight of the polyethylene glycol is 10000-15000 (for example, it can be one of 10000, 11000, 12000, 13000, 14000 or 15000). The polyester polyol and the polyethylene glycol can be provided by Mitsubishi Chemical Corporation, for example.

[0012] As a further improvement, the isocyanate is a diisocyanate, and the diisocyanate is one or two of 1,5-naphthalene diisocyanate, p-phenylene diisocyanate, and diphenylmethane diisocyanate. The polyether polyol is at least one of polyoxypropylene alcohol, polytetrahydrofuran diol, and tetrahydrofuran-propylene oxide copolymer diol. 1,5-naphthalene diisocyanate can be provided by Cosmonate ND of Mitsui of Japan, p-phenylene diisocyanate can be provided by Zhejiang Lishui Youbang Chemical Co., Ltd., diphenylmethane diisocyanate can be provided by Tosoh Corporation of Japan, and polyether polyol can be provided by Mitsubishi Chemical Corporation.

[0013] As a further improvement, the chain extender is at least one of 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, diethyltoluenediamine, and dimethylthiotoluenediamine. The chain extender can be provided by Mitsubishi Chemical Corporation, for example.

[0014] As a further improvement, the catalyst is at least one of butyl tin oxide, dibutyl tin dibutyrate, dimethyl tin dibutyrate, dioctyl tin dibutyrate, dibutyl tin diacetate, dimethyl tin diacetate, dioctyl tin diacetate, pentamethyldiethylenetriamine, triethylenediamine, dimethylethanolamine, tetramethylethylenediamine, tetramethylpropylenediamine, and N,N-dimethylcyclohexylamine. The catalyst can be provided by Dow Chemical Company, for example.

[0015] As a further improvement, the dimethylcyclosiloxane is at least one of hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane.

[0016] On the other hand, the present invention also provides a method for preparing a self-lubricating polyurethane elastomer material, comprising the following steps:

[0017] The polyurethane prepolymer, polyether polyol, chain extender and catalyst are mixed and reacted at a mixing temperature of 50-70 (for example, it can be one of 50, 52, 55, 58, 60, 65 or 70) ° C, poured into a mold after mixing, and cured at 60-80 (for example, it can be one of 60, 65, 70, 75 or 80) ° C, and demolded after curing for 2-4 (for example, it can be one of 2, 2.5, 3, 3.5 or 4) hours, and then post-vulcanized at 100-120 (for example, it can be one of 100, 105, 110, 115 or 120) ° C for 5-8 (for example, it can be one of 5, 6, 7, 8) hours to obtain a self-lubricating polyurethane elastomer.

[0018] As a further improvement, the method for preparing the polyurethane prepolymer comprises the following steps:

[0019] 1) adding 40-50 (for example, one of 40, 42, 45, 48 or 50) parts by weight of photoinitiator and 5-15 (for example, one of 5, 8, 9, 10, 12 or 15) parts by weight of hydroxy-terminated polybutadiene to a reactor and mixing them thoroughly, then adding 50-70 (for example, one of 50, 55, 60, 65 or 70) parts by weight of isocyanate and catalyst to react, the reaction temperature is 30-60 (for example, one of 30, 35, 40, 45, 50 or 60)° C., and the reaction time is 1-2 (for example, one of 1, 1.5 or 2) h;

[0020] 2) adding 15-20 (for example, one of 15, 18 or 20) parts by weight of the fluorine-containing alcohol complex to step 1), reacting at a temperature of 50-80 (for example, one of 50, 55, 60, 65, 70, 75 or 80) ° C for 2-4 (for example, one of 2, 2.5, 3, 3.5 or 4) h, and continuing to add 65-105 (for example, one of 65, 70, 80, 90, 100 or 105) parts by weight of polyol for reaction for 1-3 (for example, one of 1, 1.5, 2, 2.5 or 3) h to obtain a polyurethane prepolymer.

[0021] As a further improvement, the preparation method of the fluorine-containing alcohol complex comprises the following steps:

[0022] A) under nitrogen conditions, adding 20-50 (for example, one of 20, 25, 30, 35, 40, 45 or 50) parts by weight of hexafluorobutanol, 30-60 (for example, one of 30, 40, 50 or 60) parts by weight of p-phenylene diisocyanate and 0.5-2 (for example, 0.5, 1, 2) parts by weight of catalyst to a reactor for reaction, the reaction temperature is 60-90° C., and the reaction time is 2-4 hours;

[0023] B) lowering the temperature in step A) to -10-0 (for example, -8, -5, -2, 0) ° C, continuing to add solvent, 3-5 (for example, 3, 3.5, 4, 4.5 or 5) parts by weight of dimethylcyclosiloxane, and 20-40 (for example, 20, 25, 30, 35 or 40) parts by weight of triethanolamine, and then removing the solvent after reacting for 0.5-2 hours to obtain a fluorine-containing alcohol complex.

[0024] As a further improvement, the photoinitiator can be provided by BASF, Germany, for example.

[0025] As a further improvement, the solvent is benzene and acetone, and the volume ratio of benzene to acetone is 1:1.

[0026] On the other hand, the present invention also provides a use of a self-lubricating polyurethane elastomer material in preparing a hydraulic seal.

[0027] Compared with the prior art, the beneficial effects of the present invention are: the self-lubricating polyurethane elastomer material prepared by the present invention not only has a lower dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication), but also when the ambient temperature rises, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) do not increase significantly. DETAILED DESCRIPTION

[0028] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0029] In the following examples, octamethylcyclotetrasiloxane used in Examples 1-8 was provided by Guangzhou Yongshi Chemical Co., Ltd. with the item number D4, hexafluoro-1-butanol was provided by Shangfu Technology Co., Ltd. with the analytical grade, and triethanolamine was provided by Shengqiang (Guangzhou) Industrial Co., Ltd. with the item number A-08;

[0030] The fluorine-containing alcohol complex-1 is prepared by the following preparation method:

[0031] A) under nitrogen conditions, 40 parts by mass of hexafluorobutyl alcohol, 60 parts by mass of diphenylmethane diisocyanate and 1 part by mass of dibutyltin dibutyrate were added to a reaction kettle for reaction at a reaction temperature of 80° C. for a reaction time of 3 h;

[0032] B) The temperature in step A) was lowered to -5°C, and 30 ml of acetone, 30 ml of benzene, 4 parts by mass of octamethylcyclotetrasiloxane and 30 parts by mass of triethanolamine were added to react for 1 hour. Acetone and benzene were removed by a rotary evaporator at a temperature of 80°C and an atmospheric pressure of 0.09 MPa to obtain a fluorinated alcohol complex-1.

[0033] Embodiment 1:

[0034] The preparation of the polyurethane prepolymer comprises the following steps:

[0035] 1) Add 40 parts by mass of 1-hydroxycyclohexyl phenyl ketone and 9 parts by mass of hydroxy-terminated polybutadiene into a reaction kettle and mix thoroughly, then add 60 parts by mass of 1,5-naphthalene diisocyanate and 0.3 parts by mass of dimethyltin diacetate to react at a reaction temperature of 50° C. for a reaction time of 2 h;

[0036] 2) Add 15 parts by weight of fluorine-containing alcohol complex-1 to step 1), react at a temperature of 60°C for 4 hours, continue to add 60 parts by weight of adipic acid polyester diol (molecular weight of 3000) and 20 parts by weight of polyethylene glycol (molecular weight of 10000) to react for 2 hours to obtain a polyurethane prepolymer.

[0037] The preparation of the self-lubricating polyurethane elastomer material comprises the following steps:

[0038] 100 parts by mass of polyurethane prepolymer, 30 parts by mass of polyoxypropylene alcohol, 10 parts by mass of 1,4-butanediol and 0.2 parts by mass of dibutyltin diacetate are mixed and reacted at a mixing temperature of 60°C. After mixing, the mixture is poured into a mold and cured at 60°C. After curing for 3 hours, the mixture is demolded and then post-vulcanized at 100°C for 8 hours to obtain a self-lubricating polyurethane elastomer.

[0039] Embodiment 2:

[0040] The preparation of the polyurethane prepolymer comprises the following steps:

[0041] 1) Add 45 parts by mass of 1-hydroxycyclohexyl phenyl ketone and 10 parts by mass of hydroxy-terminated polybutadiene to a reaction kettle and mix thoroughly, then add 60 parts by mass of p-phenylene diisocyanate and 0.4 parts by mass of dimethyltin diacetate to react at a reaction temperature of 50° C. for a reaction time of 2 h;

[0042] 2) Add 15 parts by weight of fluorine-containing alcohol complex-1 to step 1), react at a temperature of 60°C for 4 hours, continue to add 50 parts by weight of adipic acid polyester diol (molecular weight of 3500) and 20 parts by weight of polyethylene glycol (molecular weight of 12000) to react for 2 hours to obtain a polyurethane prepolymer.

[0043] The preparation of the self-lubricating polyurethane elastomer material comprises the following steps:

[0044] 120 parts by mass of polyurethane prepolymer, 50 parts by mass of polyoxypropylene alcohol, 15 parts by mass of 1,4-butanediol and 0.5 parts by mass of dibutyltin diacetate are mixed and reacted at a mixing temperature of 60°C. After mixing, they are poured into a mold and cured at 60°C. After curing for 3 hours, the mold is demolded and then post-vulcanized at 100°C for 8 hours to obtain a self-lubricating polyurethane elastomer.

[0045] Embodiment 3:

[0046] The preparation of the polyurethane prepolymer comprises the following steps:

[0047] 1) Add 45 parts by mass of 1-hydroxycyclohexyl phenyl ketone and 12 parts by mass of hydroxy-terminated polybutadiene to a reactor and mix thoroughly, then add 65 parts by mass of p-phenylene diisocyanate and 0.5 parts by mass of dimethyltin diacetate to react at a reaction temperature of 60° C. for a reaction time of 1.5 h;

[0048] 2) Add 18 parts by weight of fluorine-containing alcohol complex-1 to step 1), react at a temperature of 50°C for 3 hours, continue to add 50 parts by weight of adipic acid polyester diol (molecular weight of 3500) and 30 parts by weight of polyethylene glycol (molecular weight of 12000) to react for 2 hours to obtain a polyurethane prepolymer.

[0049] The preparation of the self-lubricating polyurethane elastomer material comprises the following steps:

[0050] 120 parts by mass of polyurethane prepolymer, 40 parts by mass of polyoxypropylene alcohol, 13 parts by mass of 1,4-butanediol and 0.4 parts by mass of dibutyltin diacetate are mixed and reacted at a mixing temperature of 55°C. After mixing, the mixture is poured into a mold and cured at 60°C. After curing for 4 hours, the mixture is demolded and then post-vulcanized at 110°C for 6 hours to obtain a self-lubricating polyurethane elastomer.

[0051] Embodiment 4:

[0052] The preparation of polyurethane prepolymer is the same as in Example 1.

[0053] The preparation of the self-lubricating polyurethane elastomer material comprises the following steps:

[0054] 100 parts by mass of polyurethane prepolymer, 30 parts by mass of polyoxypropylene alcohol, 10 parts by mass of 1,4-butanediol and 0.6 parts by mass of dibutyltin diacetate are mixed and reacted at a mixing temperature of 65°C. After mixing, the mixture is poured into a mold and cured at 80°C. After curing for 3 hours, the mixture is demolded and then post-vulcanized at 120°C for 8 hours to obtain a self-lubricating polyurethane elastomer.

[0055] Example 5: The preparation of the self-lubricating polyurethane elastomer material and the preparation of the polyurethane prepolymer are the same as those in Example 1, and the components used and the mass fractions of each component are basically the same as those in Example 1, except that: the fluorine-containing alcohol complex-1 in step 2) is 25 mass parts.

[0056] Example 6: The preparation of the self-lubricating polyurethane elastomer material and the preparation of the polyurethane prepolymer are the same as those in Example 1, and the components used and the mass fractions of each component are basically the same as in Example 1, except that: in step 4), the adipic acid-based polyester diol is 40 mass parts and the polyethylene glycol is 40 mass parts.

[0057] Example 7: The preparation of the self-lubricating polyurethane elastomer material and the polyurethane prepolymer are the same as those in Example 1, and the components used and the mass fractions of each component are basically the same as those in Example 1, except that: the fluorine-containing alcohol complex-1 in step 2) is 10 mass parts.

[0058] Example 8: The preparation of the self-lubricating polyurethane elastomer material and the polyurethane prepolymer are the same as those in Example 1, and the components used and the mass fractions of each component are basically the same as in Example 1, except that: the amount of adipic acid-based polyester diol is 70 mass parts and the amount of polyethylene glycol is 10 mass parts.

[0059] Comparative Example 1: The preparation of the self-lubricating polyurethane elastomer material and the preparation of the polyurethane prepolymer are the same as those in Example 1, and the components used and the mass fractions of each component are basically the same as those in Example 1, except that: octamethylcyclotetrasiloxane is not added.

[0060] The test method is as follows:

[0061] Dynamic friction coefficient (dry friction) test standard: (HG / T 2729-2012, method A);

[0062] Dynamic friction coefficient (hydraulic oil lubrication) test standard: (HG / T 2729-2012, Method A).

[0063] The test results are shown in Table 1, as follows:

[0064]

[0065]

[0066] By comparing Example 1 with Comparative Example 1, it can be seen that without adding octamethylcyclotetrasiloxane, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) of the self-lubricating polyurethane elastomer material prepared at 30°C are 0.35 and 0.31, respectively, while at 60°C, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) are significantly increased, which are 0.51 and 0.48, respectively, while the dynamic friction coefficient (dry friction) of the self-lubricating polyurethane elastomer material prepared under the condition of adding octamethylcyclotetrasiloxane is measured at 30°C. , dynamic friction coefficient (hydraulic oil lubrication) are small, which are 0.15 and 0.10 respectively, and although the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) measured at an ambient temperature of 60°C increase, the increase is not obvious. It can be seen that the self-lubricating polyurethane elastomer material prepared by adding dimethyl cyclosiloxane in the present invention can not only significantly reduce the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication), but also when the ambient temperature rises, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) hardly change.

[0067] By comparing Example 1, Example 5, and Example 7, it can be seen that when the fluorine-containing alcohol compound-1 is 25 parts by mass, and the mass ratio of the polyol (60 parts by mass of adipic acid polyester diol and 20 parts by mass of polyethylene glycol) to the fluorine-containing alcohol compound-1 is 3.2:1, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) of the prepared self-lubricating polyurethane elastomer material are 0.28 and 0.23 respectively at 30°C, and the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) are 0.28 and 0.23 respectively at 60°C. The friction coefficients (hydraulic oil lubrication) and the friction coefficients (dry friction) of the prepared self-lubricating polyurethane elastomer material were 0.30 and 0.22 at 30°C, respectively, and the dynamic friction coefficients (hydraulic oil lubrication) were 0.34 and 0.30, respectively. When the fluorinated alcohol compound-1 was 10 parts by mass, and the mass ratio of the polyol (60 parts by mass of adipic acid polyester diol and 20 parts by mass of polyethylene glycol) to the fluorinated alcohol compound-1 was 8:1, the dynamic friction coefficients (dry friction) and dynamic friction coefficients (hydraulic oil lubrication) of the prepared self-lubricating polyurethane elastomer material were 0.30 and 0.22 at 30°C, respectively, and the dynamic friction coefficients ( The coefficients of dry friction and dynamic friction (hydraulic oil lubrication) of the self-lubricating polyurethane elastomer material prepared under the conditions of 15 parts by mass of the fluorinated alcohol compound-1 and a mass ratio of 5.3:1 of the polyol (60 parts by mass of adipic acid polyester diol and 20 parts by mass of polyethylene glycol) to the fluorinated alcohol compound-1 were small at 30°C, which were 0.15 and 0.10, respectively. The coefficients of dry friction and dynamic friction (hydraulic oil lubrication) of the self-lubricating polyurethane elastomer material measured at an ambient temperature of 60°C were increased, but the increase was not obvious. It can be seen that when the mass ratio of the polyol and the fluorinated alcohol compound of the present invention is (4-6):1, not only can the coefficients of dynamic friction (dry friction) and dynamic friction (hydraulic oil lubrication) be reduced when preparing the self-lubricating polyurethane elastomer material, but also when the ambient temperature rises, the coefficients of dynamic friction (dry friction) and dynamic friction (hydraulic oil lubrication) hardly change.

[0068] By comparing Example 1, Example 6 and Example 8, it can be seen that under the condition that the adipic acid polyester diol is 40 parts by mass and the polyethylene glycol is 40 parts by mass (the mass ratio of the adipic acid polyester diol to the polyethylene glycol is 1:1 at this time), the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) of the prepared self-lubricating polyurethane elastomer material are 0.21 and 0.18 at 30°C, respectively, and the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) measured at 60°C are increased, which are 0.25 and 0.23, respectively. Under the condition that the adipic acid polyester diol is 70 parts by mass and the polyethylene glycol is 10 parts by mass (the mass ratio of the adipic acid polyester diol to the polyethylene glycol is 7:1 at this time), the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) of the prepared self-lubricating polyurethane elastomer material are 0.23 and 0.0.21 at 30°C, respectively, and the dynamic friction coefficient (dry friction) measured at 60°C is 0.0.21. The dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) of the self-lubricating polyurethane elastomer material prepared under the conditions of 60 parts by mass of adipic acid polyester diol and 20 parts by mass of polyethylene glycol (at this time, the mass ratio of adipic acid polyester diol to polyethylene glycol is 3:1) are small, 0.15 and 0.10, respectively, and the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) measured at 30°C are increased, but the increase is not obvious; it can be seen that when the mass ratio of the polyester polyol and the polyethylene glycol of the present invention is (2-5):1, not only can the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) be reduced when the ambient temperature rises, but the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) hardly change.

[0069] It can be seen from Examples 1 to 4 that the self-lubricating polyurethane elastomer material prepared using the method for preparing a self-lubricating polyurethane elastomer material of the present invention has a dynamic friction coefficient (dry friction) and a dynamic friction coefficient (hydraulic oil lubrication) as low as 0.14 and 0.10, respectively, when the ambient temperature is 30°C, and at 60°C, the dynamic friction coefficient (dry friction) and the dynamic friction coefficient (hydraulic oil lubrication) do not increase significantly.

[0070] In summary, the self-lubricating polyurethane elastomer material prepared in the present invention not only has a lower dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication), but also when the ambient temperature rises, the dynamic friction coefficient (dry friction) and dynamic friction coefficient (hydraulic oil lubrication) do not increase significantly.

[0071] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-lubricating polyurethane elastomer material, characterized in that: The method comprises the following components in parts by weight: 70-150 parts by weight of a polyurethane prepolymer, 20-50 parts by weight of a polyether polyol, 5-20 parts by weight of a chain extender, and 0.2-0.8 parts by weight of a catalyst; The raw materials for preparing the polyurethane prepolymer include polyol, fluorine-containing alcohol compound, isocyanate, terminal hydroxyl polybutadiene and dimethyl cyclosiloxane; The preparation method of the fluorine-containing alcohol complex comprises the following steps: A) under nitrogen conditions, 20-50 parts by weight of hexafluorobutyl alcohol, 30-60 parts by weight of p-phenylene diisocyanate and 0.5-2 parts by weight of a catalyst are added to a reaction kettle for reaction at a temperature of 60-90° C. for a reaction time of 2-4 hours; B) lowering the temperature in step A) to -10-0°C, adding a solvent, 3-5 parts by weight of dimethylcyclosiloxane, and 20-40 parts by weight of triethanolamine, and reacting for 0.5-2 hours, and then removing the solvent to obtain a fluorine-containing alcohol complex; The preparation method of the polyurethane prepolymer comprises the following steps: 1) Add 40-50 parts by mass of photoinitiator and 5-15 parts by mass of hydroxyl-terminated polybutadiene to a reactor and mix thoroughly, then add 50-70 parts by mass of isocyanate and catalyst to react at a reaction temperature of 30-60°C for 1-2 hours; 2) adding 15-20 parts by weight of the fluorine-containing alcohol complex to step 1), reacting at a temperature of 50-80° C. for 2-4 hours, and then adding 65-105 parts by weight of polyol for reaction for 1-3 hours to obtain a polyurethane prepolymer; The method for preparing the self-lubricating polyurethane elastomer material comprises the following steps: The polyurethane prepolymer, polyether polyol, chain extender and catalyst are mixed and reacted at a mixing temperature of 50-70°C, poured into a mold after mixing, cured at 60-80°C, demolded after curing for 2-4 hours, and then post-vulcanized at 100-120°C for 5-8 hours to obtain a self-lubricating polyurethane elastomer.

2. A self-lubricating polyurethane elastomer material according to claim 1, characterized in that: The mass ratio of the polyol to the fluorine-containing alcohol complex is (4-6):1, and the raw materials for preparing the fluorine-containing alcohol complex include dimethylcyclosiloxane, p-phenylene diisocyanate, hexafluoro-1-butanol, and triethanolamine.

3. A self-lubricating polyurethane elastomer material according to claim 1 or 2, characterized in that: The polyols are polyester polyol and polyethylene glycol, and the mass ratio of polyester polyol to polyethylene glycol is (2-5):

1.

4. The self-lubricating polyurethane elastomer material according to claim 3, characterized in that: The polyester polyol is at least one of adipic acid polyester diol, phthalic anhydride polyester diol or alicyclic polyester diol, and the molecular weight of the polyester polyol is 3000-4000, and the molecular weight of the polyethylene glycol is 10000-15000.

5. The self-lubricating polyurethane elastomer material according to claim 1, characterized in that: The isocyanate is a diisocyanate, and the diisocyanate is one or two of 1,5-naphthalene diisocyanate, p-phenylene diisocyanate, and diphenylmethane diisocyanate. The polyether polyol is polyoxypropylene alcohol.

6. The self-lubricating polyurethane elastomer material according to claim 1, characterized in that: The chain extender is at least one of 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, diethyltoluenediamine, and dimethylthiotoluenediamine.

7. A method for preparing a self-lubricating polyurethane elastomer material according to any one of claims 1 to 6, characterized in that: The following steps are involved: The polyurethane prepolymer, polyether polyol, chain extender and catalyst are mixed and reacted at a mixing temperature of 50-70°C, poured into a mold after mixing, cured at 60-80°C, demolded after curing for 2-4 hours, and then post-vulcanized at 100-120°C for 5-8 hours to obtain a self-lubricating polyurethane elastomer.

8. The method for preparing a self-lubricating polyurethane elastomer material according to claim 7, characterized in that: The preparation method of the polyurethane prepolymer comprises the following steps: 1) Add 40-50 parts by mass of photoinitiator and 5-15 parts by mass of hydroxyl-terminated polybutadiene to a reactor and mix thoroughly, then add 50-70 parts by mass of isocyanate and catalyst to react at a reaction temperature of 30-60°C for 1-2 hours; 2) Add 15-20 parts by weight of the fluorine-containing alcohol complex to step 1), react at a temperature of 50-80° C. for 2-4 hours, and continue to add 65-105 parts by weight of polyol for reaction for 1-3 hours to obtain a polyurethane prepolymer.

9. Use of the self-lubricating polyurethane elastomer material according to claim 1 in preparing hydraulic seals.

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