Composite filler synergistically-enhanced high-temperature-resistant self-lubricating fabric liner composite material and preparation method thereof

Abstract

The invention relates to the technical field of self-lubricating fabric liner materials, in particular to a composite filler synergistically-enhanced high-temperature-resistant self-lubricating fabric liner composite material and a preparation method thereof. The invention provides a self-lubricating fabric liner composite material. The self-lubricating fabric liner composite material comprises a polyimide fabric and a polyimide resin composite material compounded in the polyimide fabric, the polyimide resin composite material comprises polyimide resin and a composite reinforcing material dispersed in the polyimide resin; the composite reinforcing material comprises boron nitride and titanium boride. The self-lubricating fabric liner composite material can bear the operation requirement of 400 DEG C high-temperature working conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-lubricating fabric liner materials, and particularly relates to a composite filler synergistically enhanced high-temperature-resistant self-lubricating fabric liner composite material and a preparation method and application thereof. BACKGROUND

[0002] The friction and wear performance of the self-lubricating fabric liner is a key factor to ensure that the moving parts of the actuating part of the aviation equipment have the characteristics of self-lubrication, impact resistance and long service life. However, when facing extreme application conditions such as high temperature, the self-lubricating fabric liner will soften and degrade, the load will decrease, and the wear failure will occur. In order to improve the high-temperature friction and wear performance and service life of the fabric liner, improving the temperature resistance of the resin matrix and the plant skeleton and introducing high-temperature lubricating additives are effective ways to solve the problem.

[0003] In previous studies, the phenolic resin used has excellent load-bearing and wear-resistant performance, but the temperature resistance of the phenolic resin is limited and is not suitable for high-temperature working conditions of 300 DEG C and above, so it is difficult to meet the increasing demand for high-temperature working conditions. SUMMARY

[0004] Therefore, the present application aims to provide a composite filler synergistically enhanced high-temperature-resistant self-lubricating fabric liner composite material and a preparation method and application thereof. The self-lubricating fabric liner composite material can withstand the operating requirements of 400 DEG C high-temperature working conditions.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions: The present application provides a self-lubricating fabric liner composite material, which comprises a polyimide fabric and a polyimide resin composite material compounded in the polyimide fabric. The polyimide resin composite material comprises a polyimide resin and a composite reinforcing material dispersed in the polyimide resin. The composite reinforcing material comprises boron nitride and titanium boride.

[0006] Preferably, the mass percentage content of the polyimide resin composite material in the self-lubricating fabric liner composite material is 15-40%.

[0007] Preferably, the mass percentage content of the composite reinforcing filler in the polyimide resin composite material is 1-2%.

[0008] Preferably, the mass ratio of the boron nitride to the titanium boride is (0.5-2):(0.5-2).

[0009] Preferably, the polyimide resin is prepared from polyamide acid, and the raw materials for preparing the polyamide acid comprise APBIA diamine, dianhydride and NA-acid anhydride blocking agent. The dianhydride includes 2,3,3,4-biphenyl tetracarboxylic dianhydride (α-BPDA), 3,3,4,4-benzophenone tetracarboxylic dianhydride (BTDA) or 3,3,4,4-biphenyl tetracarboxylic dianhydride (s-BPDA).

[0010] Preferably, the molar ratio of the APBIA diamine, the dianhydride and the NA-acid anhydride end-capping agent is (3-4):(3.5-4.5):2.

[0011] Preferably, the preparation method of the polyamic acid comprises the following steps: After mixing the APBIA diamine and the organic solvent, the dianhydride is added for polymerization reaction, and the NA-acid anhydride end-capping agent is added for end-capping reaction, so as to obtain the polyamic acid.

[0012] Preferably, the polymerization reaction is carried out in an ice water bath and a protective atmosphere. The polymerization reaction is carried out for 8-12 hours. The end-capping reaction is carried out in an ice water bath for 10-16 hours.

[0013] The application further provides a preparation method of the self-lubricating fabric liner composite material, comprising the following steps: The polyamic acid solution is mixed with the composite reinforcing filler to obtain an impregnation solution. After repeated impregnation and drying of the polyimide fabric in the impregnation solution, the polyimide fabric is cured to obtain the self-lubricating fabric liner composite material.

[0014] The application further provides application of the self-lubricating fabric liner composite material or the self-lubricating fabric liner composite material prepared by the preparation method in a self-lubricating joint bearing or an actuating part of aviation equipment.

[0015] The application provides a self-lubricating fabric liner composite material, which comprises a polyimide fabric and a polyimide resin composite material compounded in the polyimide fabric; the polyimide resin composite material comprises a polyimide resin and a composite reinforcing material dispersed in the polyimide resin; the composite reinforcing material comprises boron nitride and titanium boride. The polyimide fabric can improve the heat resistance of the fabric skeleton, and then the dispersion of the composite reinforcing material into the polyimide resin can further improve the mechanical strength and heat resistance of the polyimide resin and participate in high-temperature friction transfer to construct a high-quality friction transfer film, so that the finally prepared self-lubricating fabric liner material can realize long-term and stable operation under high-temperature working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1Fig. 1 is a graph showing the wear rate and friction coefficient of the self-lubricating fabric gasket composite material according to Example 1 and Comparative Example 1; Figure 2 Fig. 2 is a schematic diagram showing the reaction principle of the polyamide acid and the polyimide according to Example 1 of the present application. DETAILED DESCRIPTION

[0017] The present application also provides a self-lubricating fabric gasket composite material, comprising a polyimide fabric and a polyimide resin composite material compounded in the polyimide fabric. The polyimide resin composite material comprises a polyimide resin and a composite reinforcing material dispersed in the polyimide resin. The composite reinforcing material comprises boron nitride and titanium boride.

[0018] In the present application, the self-lubricating fabric is preferably a polyimide fiber filament woven fabric. The present application does not have special limitations on the specifications of the polyimide fiber, and commercially available products known in the art can be selected. In the embodiment of the present application, the fineness of the polyimide fiber is specifically 200D. In the present application, the weave structure of the polyimide fabric is preferably one or several of plain weave, twill weave and satin weave; when the weave structure of the polyimide fabric is several of the above, the present application does not have special limitations on the distribution ratio and manner of different weave structures, and any ratio or manner can be used. In the present application, the warp density of the polyimide fabric is preferably 320-490 roots / 10 cm, and the weft density is preferably 290-350 roots / 10 cm. The present application does not have special limitations on the specific process of weaving, and the above warp density and weft density can be used according to the process known in the art.

[0019] In the present application, the composite reinforcing material comprises boron nitride and titanium boride; the mass ratio of the boron nitride and the titanium boride is preferably (0.5-2):(0.5-2), more preferably 0.5:0.5, 0.5:1, 0.5:1.5, 0.5:2, 1:0.5, 1:1.5, 1.5:0.5, 1.5:1, 1.5:2, 2:0.5 or 2:1.5. In the embodiment of the present application, the mass ratio of the boron nitride and the titanium boride can be 1:1.

[0020] In the present application, the boron nitride and titanium boride can play a synergistic reinforcing effect, realizing high-temperature wear resistance of the self-lubricating fabric liner material and effectively improving the self-lubricating performance of the fabric liner material: the boron nitride has a layered structure and can provide load bearing and interlayer sliding during the friction process of the liner material; the titanium boride is a hard ceramic material and can improve the high-temperature load bearing performance of the liner material during the high-temperature friction process of the fabric liner composite material; in addition, the boron nitride and titanium boride particles both have excellent thermal conductivity, which can effectively alleviate the friction heat of the friction interface and participate in the friction chemical reaction of the friction interface, thereby realizing the synergistic reinforcement of the high-temperature tribological performance of the fabric liner composite material.

[0021] In the present application, the mass percentage content of the polyimide resin composite in the self-lubricating fabric liner composite material is preferably 15-40%, more preferably 15%, 20%, 25%, 30%, 35% or 40%. In the embodiments of the present application, the mass percentage content of the polyimide resin composite in the self-lubricating fabric liner composite material can be 30%.

[0022] In the present application, the mass percentage content of the composite reinforcing filler in the polyimide resin composite is preferably 1-2%, more preferably 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8% or 2%. In the embodiments of the present application, the mass percentage content of the composite reinforcing filler in the polyimide resin composite can be 1%, 1.5% or 2%.

[0023] In the present application, the polyimide resin is preferably prepared from polyamide acid, and the raw materials for preparing the polyamide acid preferably include APBIA diamine, dianhydride and NA-acid anhydride end-capping agent; the dianhydride includes 2,3,3,4-biphenyl tetracarboxylic dianhydride, 3,3,4,4-benzophenone tetracarboxylic dianhydride or 3,3,4,4-biphenyl tetracarboxylic dianhydride.

[0024] In the present application, the above-mentioned dianhydride has excellent thermal stability, mechanical strength and chemical resistance, the thermal stability is derived from the high bond energy of the biphenyl conjugated system in the dianhydride, and the mechanical strength is from the planar rigid stacking in the molecular chain of the dianhydride.

[0025] In the present application, the molar ratio of the APBIA diamine, dianhydride and NA-acid anhydride end-capping agent is preferably (3-4):(3.5-4.5):2. In the embodiments of the present application, the molar ratio of the APBIA diamine, dianhydride and NA-acid anhydride end-capping agent is specifically 3.865:3.551:2, 3.865:4.185:2 or 3.865:4.014:2.

[0026] The present application also provides a preparation method of the polyamide acid in the above technical solution, which comprises the following steps: The APBIA diamine and the organic solvent are mixed, then a dianhydride is added to carry out a polymerization reaction, and a NA-acid anhydride end-capping agent is added to carry out an end-capping reaction, so as to obtain the polyamic acid.

[0027] In the present application, the organic solvent preferably comprises 1-methyl-2-pyrrolidone (NMP) and / or N,N-dimethylacetamide (DMAC). When the organic solvent is NMP and DMAC, the present application does not have any special limitation on the ratio of the NMP and DMAC, and the NMP and DMAC can be mixed in any ratio.

[0028] In the present application, the ratio of the APBIA diamine and the organic solvent is preferably (2-10) g:100 mL, and more preferably 2 g:100 mL, 3 g:100 mL, 4 g:100 mL, 5 g:100 mL, 6 g:100 mL, 7 g:100 mL, 8 g:100 mL, 9 g:100 mL or 10 g:100 mL. In the embodiments of the present application, the ratio of the APBIA diamine and the organic solvent is specifically 4.48 g:100 mL or 5.10 g:100 mL.

[0029] In the present application, the mixing is preferably carried out under a protective atmosphere, which is preferably a nitrogen atmosphere, and stirring. The present application does not have any special limitation on the process of stirring, and the process well known to those skilled in the art can be used as long as the APBIA diamine is completely dissolved in the organic solvent.

[0030] The present application does not have any special limitation on the process of adding the dianhydride, and the process well known to those skilled in the art can be used.

[0031] In the present application, the polymerization reaction is preferably carried out in an ice water bath and a protective atmosphere, which is preferably a nitrogen atmosphere. The time of the polymerization reaction is preferably 8-12 h, and more preferably 8 h, 9 h, 10 h, 11 h or 12 h.

[0032] The present application does not have any special limitation on the process of adding the NA-acid anhydride end-capping agent, and the process well known to those skilled in the art can be used. The NA-acid anhydride end-capping agent is preferably a conventional commercially available product.

[0033] In the present application, the end-capping reaction is preferably carried out in an ice water bath, and the time is preferably 10-16 h, and more preferably 10 h, 11 h, 12 h, 13 h, 14 h, 15 h or 16 h. In the present application, the room temperature can be understood as not being subjected to additional heating or cooling.

[0034] In the present application, the polyamic acid prepared by the above preparation method is preferably a polyamic acid solution, that is, no post-treatment is carried out for purification after the end-capping reaction is completed.

[0035] The application further provides a preparation method of the self-lubricating fabric liner composite material. The polyamide acid solution is mixed with the composite reinforcing filler to obtain an impregnation solution. The polyimide fabric is repeatedly impregnated and dried in the impregnation solution, and then cured to obtain the self-lubricating fabric liner composite material. The polyamide acid in the polyamide acid solution is the polyamide acid in the above technical solution or the polyamide acid prepared by the preparation method in the above technical solution.

[0036] The polyamide acid solution is mixed with the composite reinforcing filler to obtain an impregnation solution.

[0037] In the application, the polyamide acid solution is preferably obtained by diluting the polyamide acid solution prepared in the above technical solution with a solvent. The solvent is preferably 1-methyl-2-pyrrolidone. The usage ratio of the polyamide acid solution to the solvent is preferably 0.1-0.3 g: 1 mL, more preferably 0.1 g: 1 mL, 0.15 g: 1 mL, 0.2 g: 1 mL, 0.25 g: 1 mL or 0.3 g: 1 mL. In the embodiments of the application, the usage ratio of the polyamide acid solution to the solvent can be 0.2 g / mL or 0.17 g / mL.

[0038] The mixing process is not particularly limited in the application and can be performed by using a process well known to those skilled in the art.

[0039] After obtaining the impregnation solution, the polyimide fabric is repeatedly impregnated and dried in the impregnation solution, and then cured to obtain the self-lubricating fabric liner composite material.

[0040] In the application, the polyimide fabric is preferably pretreated before impregnation. The pretreatment is preferably air plasma treatment. The power of the air plasma treatment is preferably 40-300 W, more preferably 40 W, 80 W, 120 W, 160 W, 200 W, 230 W, 260 W or 300 W. The time is preferably 5-30 min, more preferably 5 min, 10 min, 15 min, 20 min, 25 min or 30 min. In the embodiments of the application, the power of the air plasma treatment can be 100 W and the time can be 10 min.

[0041] In the present application, the air plasma treatment can etch the fiber surface of the polyimide fabric, break the molecular chain of the fiber surface, introduce active functional groups on the fiber surface, so that the polyimide fabric produces chemical bonding effect with the polyamide acid resin matrix during the impregnation process, enhances the interfacial bonding effect between the fabric and the polyimide resin, thereby enhancing the friction and wear performance of the self-lubricating fabric liner material.

[0042] The present application does not have any special limitation on the process of impregnation and drying, and the process known to those skilled in the art is used to ensure that the gumming amount (the sum of the mass of polyamide acid and composite reinforcing filler accounts for 20-30% of the mass of the fabric prepreg) is in the range of 20-30%. In the embodiments of the present application, the drying method is preferably drying.

[0043] In the present application, after the repeated impregnation and drying are completed, the polyamide acid resin and the composite reinforcing filler are coated on the surface of the polyimide fabric as the continuous phase of the composite material.

[0044] In the present application, the curing pressure is preferably 0.01-3 MPa, more preferably 0.01 MPa, 0.2 MPa, 0.5 MPa, 1 MPa, 1.5 MPa, 2 MPa, 2.5 MPa or 3 MPa; the curing temperature is preferably raised from room temperature to 100℃ at a heating rate of 3-10℃ / min, then kept for 180-240 min, then raised to 200℃ at a heating rate of 3-10℃ / min, then kept for 30-60 min, then raised to 250℃ at a heating rate of 3-10℃ / min, then kept for 30-60 min, then raised to 300℃ at a heating rate of 3-10℃ / min, then kept for 30-60 min, then raised to 350℃ at a heating rate of 3-10℃ / min, then kept for 60 min; more preferably raised from room temperature to 100℃ at a heating rate of 5-8℃ / min, then kept for 180-240 min, then raised to 200℃ at a heating rate of 5-8℃ / min, then kept for 30-60 min, then raised to 250℃ at a heating rate of 5-8℃ / min, then kept for 30-60 min, then raised to 300℃ at a heating rate of 5-8℃ / min, then kept for 30-60 min, then raised to 350℃ at a heating rate of 5-8℃ / min, then kept for 60 min.

[0045] The application further provides application of the self-lubricating fabric liner composite material in a self-lubricating joint bearing or an actuating part of aviation equipment.

[0046] The technical solutions in the application will be described clearly and completely below in combination with the embodiments in the application. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0047] Embodiment 1 The reaction principle is shown in Figure 2 4.48g of APBIA diamine is added into 100mL of 1-methyl-2-pyrrolidone (NMP) reagent, and continuously stirred and dissolved under a nitrogen protection atmosphere. After complete dissolution, 4.58g of s-BPDA dianhydride is added into the reaction solution, and stirred and reacted for 10h under an ice bath and a nitrogen environment. Then, 1.44g of NA-acid anhydride end-capping agent is added into the mixed solution, and stirred and reacted for 12h at room temperature to obtain a bright yellow transparent polyamide acid solution; 5g of the polyamide acid solution is dispersed in 25mL of NMP solvent to obtain a polyamide acid solution; The polyamide acid solution, 0.5g of boron nitride and 0.5g of titanium boride are mixed to obtain an impregnation solution; A polyimide fabric is manufactured by using plain weave with a radial density of 400 threads / 10cm and a weft density of 350 threads / 10cm. After air plasma modification treatment of the polyimide fabric under the condition of 100W for 10min, the polyimide fabric is repeatedly impregnated and dried in the impregnation solution until the total mass percentage of the polyamide acid, boron nitride and titanium boride in the obtained fabric prepreg reaches 30% to obtain a fabric prepreg; The fabric prepreg is pasted on the surface of a 17-4PH metal substrate with the polyamic acid, and is raised from room temperature to 100 DEG C, kept for 180 min, raised to 200 DEG C, kept for 30 min, raised to 250 DEG C, kept for 30 min, raised to 300 DEG C, kept for 30 min, raised to 350 DEG C, kept for 60 min (the raising rate of the whole raising process is 5 DEG C / min), and cured under the condition of 0.5 MPa, to obtain the self-lubricating fabric lining composite material.

[0048] Example 2 5.10 g of APBIA diamine is added into 100 mL of 1-methyl-2-pyrrolidone (NMP) reagent, and is continuously stirred and dissolved under a nitrogen protection atmosphere; after complete dissolution, 5.22 g of s-BPDA dianhydride is added into the above reaction solution, and is stirred and reacted for 10 h under an ice bath and a nitrogen environment. Then, 1.64 g of NA-anhydride end-capping agent is added into the above mixed solution, and is stirred and reacted for 12 h at room temperature, to obtain a bright yellow transparent polyamic acid solution; 5 g of the polyamic acid solution is dispersed in 30 mL of NMP solvent, to obtain a polyamic acid solution; The polyamic acid solution, 0.5 g of boron nitride and 0.5 g of titanium boride are mixed, to obtain an impregnating solution; A polyimide fabric is manufactured by adopting plain weave with a radial density of 400 roots / 10 cm and a weft density of 350 roots / 10 cm, and the polyimide fabric is subjected to air plasma modification treatment under the condition of 100 W for 10 min; then, the fabric prepreg is repeatedly immersed and dried in the impregnating solution until the mass percentage content of the total amount of polyamic acid, boron nitride and titanium boride in the obtained fabric prepreg reaches 30%, to obtain a fabric prepreg; The fabric prepreg is pasted on the surface of a 17-4PH metal substrate with the polyamic acid, and is raised from room temperature to 100 DEG C, kept for 180 min, raised to 200 DEG C, kept for 30 min, raised to 250 DEG C, kept for 30 min, raised to 300 DEG C, kept for 30 min, raised to 350 DEG C, kept for 60 min (the raising rate of the whole raising process is 5 DEG C / min), and cured under the condition of 0.5 MPa, to obtain the self-lubricating fabric lining composite material.

[0049] Example 3 4.48g of APBIA diamine was added into 100mL of 1-methyl-2-pyrrolidone (NMP) reagent, and continuously stirred and dissolved under the protection of nitrogen atmosphere. After complete dissolution, 4.58g of a-BPDA dianhydride was added into the above reaction solution, and stirred and reacted under the condition of ice bath and nitrogen atmosphere for 10h. Subsequently, 1.44g of NA-acid anhydride capping agent was added into the above mixed solution, and stirred and reacted at room temperature for 12h to obtain a bright yellow transparent polyamic acid solution; 5g of the polyamic acid solution was dispersed in 25mL of NMP solvent to obtain a polyamic acid solution; The polyamic acid solution, 1g of boron nitride and 1g of titanium boride were mixed to obtain an impregnating solution; A polyimide fabric was prepared by using plain weave with a radial density of 400 / 10cm and a weft density of 350 / 10cm. After air plasma modification treatment of the polyimide fabric under the condition of 100W for 10min, the polyimide fabric was repeatedly immersed and dried in the impregnating solution until the total amount of polyamic acid, boron nitride and titanium boride in the obtained fabric prepreg reached 30% by mass percentage to obtain a fabric prepreg; The fabric prepreg was pasted on the surface of a 17-4PH metal substrate by using the polyamic acid. The temperature was increased from room temperature to 100℃, and kept for 180min. The temperature was increased to 200℃, and kept for 30min. The temperature was increased to 250℃, and kept for 30min. The temperature was increased to 300℃, and kept for 30min. The temperature was increased to 350℃, and kept for 60min (the temperature increasing rate of the whole temperature increasing process was 5℃ / min). The obtained self-lubricating fabric lining composite material was cured under the condition of 0.5MPa.

[0050] Example 4 4.48g of APBIA diamine was added into 100mL of 1-methyl-2-pyrrolidone (NMP) reagent, and continuously stirred and dissolved under the protection of nitrogen atmosphere. After complete dissolution, 5.40g of BTDA dianhydride was added into the above reaction solution, and stirred and reacted under the condition of ice bath and nitrogen atmosphere for 10h. Subsequently, 1.44g of NA-acid anhydride capping agent was added into the above mixed solution, and stirred and reacted at room temperature for 12h to obtain a bright yellow transparent polyamic acid solution; 5g of the polyamic acid solution was dispersed in 25mL of NMP solvent to obtain a polyamic acid solution; The polyamic acid solution, 0.75g of boron nitride and 0.75g of titanium boride were mixed to obtain an impregnating solution; The polyimide fabric is obtained by using plain weave to weave at a radial density of 400 threads / 10 cm and a weft density of 350 threads / 10 cm, and then performing air plasma modification treatment on the polyimide fabric under the condition of 100 W for 10 min, and then repeatedly performing impregnation and drying in the impregnating solution until the total amount of polyamide acid, boron nitride and titanium boride accounts for 30% of the mass percentage in the obtained fabric prepreg, to obtain the fabric prepreg; The fabric prepreg is pasted on the surface of a 17-4PH metal substrate by using the polyamide acid, and then the temperature is increased from room temperature to 100℃, and then the temperature is kept at 100℃ for 180 min, and then the temperature is increased to 200℃, and then the temperature is kept at 200℃ for 30 min, and then the temperature is increased to 250℃, and then the temperature is kept at 250℃ for 30 min, and then the temperature is increased to 300℃, and then the temperature is kept at 300℃ for 30 min, and then the temperature is increased to 350℃, and then the temperature is kept at 350℃ for 60 min (the temperature increasing rate of the whole temperature increasing process is 5℃ / min), and then the curing is performed under the condition of 0.5 MPa, to obtain the self-lubricating fabric lining composite material.

[0051] Comparative Example 1 The difference from Example 1 is that boron nitride and titanium boride are not added, to obtain the self-lubricating fabric lining composite material.

[0052] Comparative Example 2 The difference from Example 1 is that titanium boride is not added, to obtain the self-lubricating fabric lining composite material.

[0053] Comparative Example 3 The difference from Example 1 is that boron nitride is not added, to obtain the self-lubricating fabric lining composite material.

[0054] Test Example The self-lubricating fabric lining composite materials prepared from Examples 1-4 and Comparative Examples 1-3 are respectively subjected to high-temperature friction and wear performance test, and the test method is as follows: the test conditions are that the pressure is 17 N, the sliding friction speed is 500 r / min (the rotation radius is 5 mm), the time is 120 min, the temperature is 400℃, a ball-disc friction and wear tester is used, a Gr15 steel ball with a diameter of 6 mm is used as the friction pair, the friction coefficient is automatically output after the data collected by the connected computer is processed. The wear width of the self-lubricating fabric lining composite material is measured by using an optical fiber crystal, and the wear volume of the fabric lining material is calculated by using Formula 1, and the test results are shown in Table 1 and Figure 1 . Formula 1 Formula 2 Wherein, R is the diameter of the pair (mm), b is the width of the wear mark (mm), d is the diameter of the pair rotation (mm), is the wear volume (mm 3), P is the applied load (N), L is the total sliding distance (m), Ws is the wear rate (mm 3 / N.m); Table 1 Friction data of self-lubricating fabric liner composite materials according to Examples 1-4 and Comparative Examples 1-3

[0055] As shown in Table 1, the wear rate and friction coefficient of the self-lubricating fabric liner composite materials according to Examples 1-4 are significantly improved compared to the high-temperature wear resistance and lubrication performance of the comparative examples.

[0056] Figure 1 Figures (a) and (b) are graphs of the wear rate and friction coefficient of the self-lubricating fabric liner composite materials according to Example 1 and Comparative Example 1, wherein (a) is a comparison graph of the friction coefficient, and (b) is a comparison graph of the wear rate. Figure 1 As shown in Figures (a) and (b), the wear rate and friction coefficient of the self-lubricating fabric liner composite material according to Example 1 are 0.55x10 -5 m 3 ·(Nm) -1 and 0.07, respectively, which are reduced by 85% and 58.8%, respectively, compared to Comparative Example 1, achieving significant improvement in the high-temperature wear resistance and lubrication performance of the self-lubricating fabric liner. This indicates that after the self-lubricating fabric liner is reinforced with boron nitride and titanium boride composite reinforcing fillers, the high-temperature friction and wear performance of the fabric liner material is significantly improved and improved.

[0057] The above description is only a preferred embodiment of the present application, and does not limit the present application in any form. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A self-lubricating fabric liner composite material, characterized in that, Includes polyimide fabrics and polyimide resin composites incorporated in the polyimide fabrics; The polyimide resin composite material includes a polyimide resin and a composite reinforcing material dispersed in the polyimide resin; The composite reinforcing material includes boron nitride and titanium boride.

2. The self-lubricating fabric liner composite material as described in claim 1, characterized in that, The self-lubricating fabric liner composite material contains 15-40% polyimide resin composite material by mass.

3. The self-lubricating fabric liner composite material as described in claim 1, characterized in that, The composite reinforcing filler in the polyimide resin composite material has a mass percentage content of 1-2%.

4. The self-lubricating fabric liner composite material as described in claim 1 or 3, characterized in that, The mass ratio of boron nitride to titanium boride is (0.5~2):(0.5~2).

5. The self-lubricating fabric liner composite material as described in claim 1, characterized in that, The polyimide resin is prepared from polyamic acid, and the raw materials for preparing the polyamic acid include APBIA diamine, dianhydride, and NA-anhydride end-capping agent; The dianhydride includes 2,3,3,4-biphenyltetracarboxylic dianhydride, 3,3,4,4-benzophenone tetracarboxylic dianhydride, or 3,3,4,4-biphenyltetracarboxylic dianhydride.

6. The self-lubricating fabric liner composite material as described in claim 5, characterized in that, The molar ratio of APBIA diamine, dianhydride, and NA-anhydride end-capping agent is (3~4):(3.5~4.5):

2.

7. The self-lubricating fabric liner composite material as described in claim 5 or 6, characterized in that, The preparation method of the polyamic acid includes the following steps: APBIA diamine and an organic solvent are mixed, and dianhydride is added to carry out a polymerization reaction. Then, NA-anhydride end-capping agent is added to carry out an end-capping reaction to obtain the polyamic acid.

8. The self-lubricating fabric liner composite material as described in claim 7, characterized in that, The polymerization reaction was carried out in an ice-water bath and under a protective atmosphere; The polymerization reaction takes 8-12 hours; The end-capping reaction was carried out under ice-water bath conditions for 10-16 hours.

9. A method for preparing the self-lubricating fabric liner composite material according to any one of claims 1 to 8, characterized in that, Includes the following steps: A polyamic acid solution is mixed with a composite reinforcing filler to obtain an impregnation solution; After repeatedly impregnating and drying the polyimide fabric in the impregnation solution, it is cured to obtain the self-lubricating fabric pad composite material.

10. The application of the self-lubricating fabric liner composite material according to any one of claims 1 to 8 or the self-lubricating fabric liner composite material prepared by the preparation method according to claim 9 in self-lubricating spherical bearings or in the moving parts of aerospace equipment.

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