Organic fiber composite liner material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of aero-engine gasket materials, in particular to an organic fiber composite gasket material and a preparation method and application thereof. The invention provides an organic fiber composite liner material. The organic fiber composite liner material comprises a blend fiber fabric and a phenolic resin composite material compounded in the blend fiber fabric, the phenolic resin composite material comprises phenolic resin and a reinforcing filler dispersed in the phenolic resin, the reinforcing filler comprises molybdenum disulfide nanosheets and carbon quantum dots loaded on the surfaces of the molybdenum disulfide nanosheets; the blended fiber fabric comprises a dopamine modified blended fabric and halloysite nanotubes loaded on the surface of the dopamine modified blended fabric. The organic fiber composite liner material has excellent tribological properties.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engine lining materials, and in particular to an organic fiber composite lining material and a preparation method and application thereof. Background Art

[0002] The load-bearing and wear-resistant properties of organic fiber composite gasket materials have an important impact on the service performance and service life of many moving parts such as aircraft engine nacelles and fan blade roots. With the rapid development of science and technology, mechanical parts need to operate smoothly under more demanding working conditions, especially self-lubricating parts used in the field of high-end lubrication. Therefore, higher requirements are placed on the friction and wear performance of self-lubricating fabric gaskets. Summary of the invention

[0003] The object of the present invention is to provide an organic fiber composite gasket material and a preparation method and application thereof. The organic fiber composite gasket material has excellent friction reduction and wear resistance.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The present invention provides an organic fiber composite gasket material, comprising a blended fiber fabric and a phenolic resin composite material composited in the blended fiber fabric;

[0006] The phenolic resin composite material comprises a phenolic resin and a reinforcing filler dispersed in the phenolic resin;

[0007] The reinforcing filler comprises molybdenum disulfide nanosheets and carbon quantum dots loaded on the surface of the molybdenum disulfide nanosheets;

[0008] The blended fiber fabric comprises a dopamine-modified blended fabric and halloysite nanotubes loaded on the surface of the dopamine-modified blended fabric.

[0009] Preferably, the preparation method of the reinforcing filler comprises the following steps:

[0010] Firstly, citric acid, urea and water are mixed and subjected to a hydrothermal reaction to obtain carbon quantum dots;

[0011] Molybdenum disulfide nanosheets and hydroxypropyl cellulose are mixed and ball-milled to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0012] The polysaccharide-modified molybdenum disulfide nanosheets, carbon quantum dots and water are mixed for a second time and loaded to obtain the reinforced filler.

[0013] Preferably, the mass ratio of citric acid to urea is (0.5-1): (0.5-1);

[0014] The concentration of citric acid in the mixed solution obtained by the first mixing is 20 to 60 mg / mL;

[0015] The temperature of the hydrothermal reaction is 120-180°C and the time is 8-12h;

[0016] After the hydrothermal reaction is completed, centrifugation, dialysis and drying are performed in sequence; the centrifugation speed is 8000-10000 rpm, and the time is 8-12 minutes.

[0017] Preferably, the mass ratio of the molybdenum disulfide nanosheets to hydroxypropyl cellulose is 1:(0.5-1);

[0018] The rotating speed of the mixing ball mill is 400-800 rpm, and the time is 8-16 hours.

[0019] Preferably, the mass ratio of the polysaccharide-modified molybdenum disulfide nanosheets to the carbon quantum dots is 1:(0.2-0.5);

[0020] The loading is carried out under stirring conditions, and the stirring time is 4 to 10 hours.

[0021] Preferably, the method for preparing the blended fiber fabric comprises the following steps:

[0022] The dopamine-modified blended fabric is adsorbed in a halloysite nanotube dispersion to obtain the blended fiber fabric.

[0023] Preferably, the method for preparing the dopamine-modified blended fabric comprises the following steps:

[0024] Modifying the blended fabric in a dopamine solution to obtain the dopamine-modified blended fabric;

[0025] The concentration of the dopamine solution is 1-3 mg / mL, and the modification time is 16-24 hours.

[0026] Preferably, the concentration of the halloysite nanotube dispersion is 0.2 to 0.6 mg / mL;

[0027] The adsorption time is 16 to 24 hours.

[0028] The present invention also provides a method for preparing the organic fiber composite gasket material described in the above technical solution, comprising the following steps:

[0029] mixing the reinforcing filler and the phenolic resin solution to obtain an impregnation solution;

[0030] The blended fiber fabric is placed in the impregnation liquid for impregnation, and then solidified to obtain the organic fiber composite lining material.

[0031] The present invention also provides the use of the organic fiber composite liner material described in the above technical solution or the organic fiber composite liner material prepared by the preparation method described in the above technical solution in an aeroengine.

[0032] The present invention provides an organic fiber composite gasket material, comprising a blended fiber fabric and a phenolic resin composite material composited in the blended fiber fabric; the phenolic resin composite material comprises a phenolic resin and a reinforcing filler dispersed in the phenolic resin; the reinforcing filler comprises molybdenum disulfide nanosheets and carbon quantum dots loaded on the surface of the molybdenum disulfide nanosheets; the blended fiber fabric comprises a dopamine-modified blended fabric and halloysite nanotubes loaded on the surface of the dopamine-modified blended fabric. The present invention introduces molybdenum disulfide nanosheets and carbon quantum dots into the interior of the organic fiber composite gasket material at the same time, and realizes the synergistic enhancement effect of fillers of different dimensions on the tribological properties of the organic fiber composite gasket material by exerting the rolling lubrication function of the carbon quantum dots (zero-dimensional) and the interlayer sliding performance (friction-reducing and lubricating effect) of the molybdenum disulfide (two-dimensional nanosheets), thereby giving the organic fiber composite gasket material excellent friction-reducing and wear-resistant properties; in addition, the present invention loads halloysite nanotubes on the surface of the dopamine-modified blended fabric, and promotes the mechanical interlocking and chemical bonding between the fabric fibers and the resin matrix by improving the surface roughness and active group content of the blended fabric fibers, thereby enhancing the interfacial bonding properties of the fabric gasket material, improving the interfacial stress transfer efficiency of the gasket material during the friction process, avoiding resin shedding and fiber pull-out induced by interfacial stress concentration, and further enhancing the tribological properties of the organic fiber composite gasket material. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The wear rate and friction coefficient diagram of the organic fiber composite liner material described in Comparative Example 2 and Example 1;

[0034] Figure 2 This is a morphology characterization diagram of the carbon quantum dots and reinforced fillers described in Example 1. DETAILED DESCRIPTION

[0035] The present invention provides an organic fiber composite gasket material, comprising a blended fiber fabric and a phenolic resin composite material composited in the blended fiber fabric;

[0036] The phenolic resin composite material comprises a phenolic resin and a reinforcing filler dispersed in the phenolic resin;

[0037] The reinforcing filler comprises molybdenum disulfide nanosheets and carbon quantum dots loaded on the surface of the molybdenum disulfide nanosheets;

[0038] The blended fiber fabric comprises a dopamine-modified blended fabric and halloysite nanotubes loaded on the surface of the dopamine-modified blended fabric.

[0039] In the present invention, unless otherwise specified, all raw materials are commercially available products well known to those skilled in the art.

[0040] In the present invention, the mass percentage of the phenolic resin composite material in the organic fiber composite gasket material is preferably 15-40%, more preferably 20-35%, and most preferably 25-30%.

[0041] In the present invention, the mass ratio of the reinforcing filler to the phenolic resin in the phenolic resin composite material is preferably (0.5-2):100, more preferably (1-2):100.

[0042] In the present invention, the mass ratio of the dopamine-modified blended fabric to the halloysite nanotubes in the blended fiber fabric is preferably 100:(1-2), more preferably 100:(1.2-1.8), and most preferably 100:(1.4-1.6).

[0043] In the present invention, the mass ratio of molybdenum disulfide nanosheets and carbon quantum dots in the reinforcing filler is preferably 1:(0.2-0.5). In an embodiment of the present invention, the mass ratio of molybdenum disulfide nanosheets and carbon quantum dots can be 1:0.2, 1:0.25 or 1:0.3.

[0044] In the present invention, the method for preparing the blended fiber fabric preferably comprises the following steps:

[0045] The dopamine-modified blended fabric is adsorbed in a halloysite dispersion to obtain the blended fiber fabric.

[0046] In the present invention, the method for preparing the dopamine-modified blended fabric preferably comprises the following steps:

[0047] Modifying the blended fabric in a dopamine solution to obtain the dopamine-modified blended fabric;

[0048] The concentration of the dopamine solution is 1-3 mg / mL, and the modification time is 16-24 hours.

[0049] In the present invention, the blended fabric is preferably a self-lubricating blended fabric, more preferably a meta-aramid fiber-polytetrafluoroethylene fiber blended fabric. In the present invention, the organizational structure of the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric is preferably one or more of plain, twill and satin. When the organizational structure of the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric is two or more of the above-mentioned specific selections, the present invention has no special restrictions on the distribution ratio and method of different organizational structures, and any ratio or method can be used. In the present invention, the warp density of the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric is preferably 320 to 490 strands / 10cm, and the weft density is preferably 290 to 350 strands / 10cm. In the present invention, the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric is preferably woven with polytetrafluoroethylene fiber as weft yarn and meta-aramid fiber as warp yarn. The present invention does not have any special restrictions on the weaving process, and the process well known to those skilled in the art can be used. In an embodiment of the present invention, the fineness of the polytetrafluoroethylene fiber is 400D, and the fineness of the meta-aramid fiber is 200D.

[0050] In the present invention, the concentration of the dopamine solution is preferably 1-3 mg / mL, more preferably 1.5-2.5 mg / mL, and most preferably 1.8-2.2 mg / mL. In an embodiment of the present invention, the concentration of the dopamine solution may be 2 mg / mL. In the present invention, the pH value of the dopamine solution may be 8.5.

[0051] In the present invention, the volume of the dopamine solution used for each 100 mm×100 mm blended fabric is preferably 150-250 mL. In an embodiment of the present invention, the volume of the dopamine solution used for each 100 mm×100 mm blended fabric may be 200 mL.

[0052] In the present invention, the modification temperature is preferably room temperature; the modification time is preferably 16 to 24 hours, more preferably 18 to 22 hours, and most preferably 19 to 21 hours. In the present invention, the modification is preferably carried out under stirring conditions. The present invention does not have any special restrictions on the stirring process, and the process well known to those skilled in the art can be used. In an embodiment of the present invention, the modification temperature can be room temperature and the time can be 20 hours.

[0053] After the modification is completed, the present invention also preferably includes washing and drying performed in sequence. The present invention does not have any special limitation on the washing and drying processes, and the washing and drying processes may be performed using processes well known to those skilled in the art.

[0054] In the present invention, the concentration of the halloysite dispersion is preferably 0.2-0.6 mg / mL, more preferably 0.3-0.5 mg / mL, and most preferably 0.35-0.45 mg / mL. In an embodiment of the present invention, the concentration of the halloysite dispersion may be 0.2 mg / mL, 0.3 mg / mL or 0.4 mg / mL.

[0055] In the present invention, the volume of the halloysite dispersion used for each 100mm×100mm of the dopamine modified blended fabric is preferably 150-250mL. In an embodiment of the present invention, the volume of the halloysite dispersion used for each 100mm×100mm of the dopamine modified blended fabric may be 200mL.

[0056] In the present invention, the adsorption temperature is preferably room temperature; the adsorption time is preferably 6 to 24 hours, more preferably 10 to 20 hours. In the present invention, the adsorption is preferably carried out under stirring conditions. The present invention does not have any special restrictions on the stirring process, and the process well known to those skilled in the art can be used. In an embodiment of the present invention, the adsorption temperature can be room temperature and the time can be 16 hours.

[0057] In the present invention, the adsorption process is to generate hydrogen bonds and electrostatic adsorption between the hydroxyl groups on the surface of the halloysite nanotubes and the active groups on the surface of the blended fabric, thereby achieving the loading of the halloysite nanotubes on the surface of the blended fabric. The present invention increases the surface roughness and active group content of the blended fabric by loading the halloysite nanotubes on the surface of the blended fabric, thereby generating a chemical bonding effect between the blended fiber fabric and the phenolic resin matrix during the impregnation process, enhancing the interface bonding effect between the blended fiber fabric and the phenolic resin, thereby enhancing the friction performance of the organic fiber composite gasket material.

[0058] After the adsorption is completed, the present invention also preferably includes washing and drying performed in sequence. The present invention does not have any special limitation on the washing and drying processes, and the washing and drying processes may be performed using processes well known to those skilled in the art.

[0059] In the present invention, the mass ratio of the phenolic resin to the reinforcing filler in the phenolic resin composite material is preferably 100:(1-2). In an embodiment of the present invention, the mass ratio of the phenolic resin to the reinforcing filler may be 100:1, 100:2 or 100:1.5.

[0060] In the present invention, the mass ratio of molybdenum disulfide nanosheets to carbon quantum dots in the reinforcing filler is preferably 1:(0.2-0.8), more preferably 1:(0.2-0.5), and most preferably 1:(0.2-0.3). In an embodiment of the present invention, the mass ratio of molybdenum disulfide nanosheets to carbon quantum dots can be 1:0.2, 1:0.25 or 1:0.3.

[0061] In the present invention, the preparation method of the reinforcing filler preferably comprises the following steps:

[0062] Firstly, citric acid, urea and water are mixed and subjected to a hydrothermal reaction to obtain carbon quantum dots;

[0063] Molybdenum disulfide nanosheets and hydroxypropyl cellulose are mixed and ball-milled to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0064] The polysaccharide-modified molybdenum disulfide nanosheets, carbon quantum dots and water are mixed for a second time and loaded to obtain the reinforced filler.

[0065] The present invention first mixes citric acid, urea and water, and performs a hydrothermal reaction to obtain carbon quantum dots.

[0066] In the present invention, the water is preferably distilled water. In the present invention, the mass ratio of citric acid and urea is preferably (0.5-1): (0.5-1), more preferably (0.6-0.9): (0.6-0.9), and most preferably (0.8-0.9): (0.8-0.9). In the present invention, the concentration of citric acid in the mixed solution obtained by the first mixing is preferably 20-60 mg / mL, more preferably 40-60 mg / mL. In an embodiment of the present invention, the mass ratio of citric acid and urea can be 0.8:0.65, 1:1 or 0.8:0.5; the concentration of citric acid in the mixed solution obtained by the first mixing can be 40 mg / mL.

[0067] The present invention does not have any special limitation on the first mixing process, and the first mixing process may be performed using a process well known to those skilled in the art.

[0068] In the present invention, the temperature of the hydrothermal reaction is preferably 120-180°C, more preferably 150-180°C; the time of the hydrothermal reaction is preferably 8-12h, more preferably 10-12h. In an embodiment of the present invention, the temperature of the hydrothermal reaction can be 160°C, and the time can be 10min. In an embodiment of the present invention, the hydrothermal reaction is carried out in a high-pressure hydrothermal autoclave equipped with a polytetrafluoroethylene liner.

[0069] After the hydrothermal reaction is completed, the present invention also preferably includes centrifugation, dialysis and drying performed in sequence; the speed of the centrifugation is preferably 8000-10000rpm, more preferably 9000-10000rpm; the time is preferably 8-12min, more preferably 10-12min. In an embodiment of the present invention, the speed of the centrifugation can be 9000rpm and the time can be 10min. In the present invention, the function of the centrifugation is to remove larger particles in the mixed solution obtained after the hydrothermal reaction is completed.

[0070] The present invention does not have any special limitation on the dialysis process, and the dialysis process may be carried out by using a process well known to those skilled in the art and ensuring that unreacted ions and small particles are removed.

[0071] In the present invention, the drying method is preferably freeze-drying; the present invention does not have any special limitation on the freeze-drying process, and the process well known to those skilled in the art can be used.

[0072] The preparation method of the reinforcing filler of the present invention further comprises mixing and ball-milling the molybdenum disulfide nanosheets and hydroxypropyl cellulose to obtain polysaccharide-modified molybdenum disulfide nanosheets.

[0073] In the present invention, the mass ratio of the molybdenum disulfide nanosheets to the hydroxypropyl cellulose is preferably 1:(0.5-1), more preferably 1:(0.8-1). In an embodiment of the present invention, the mass ratio of the molybdenum disulfide nanosheets to the hydroxypropyl cellulose may be 1:1.

[0074] In the present invention, the speed of the mixing ball mill is preferably 400-800 rpm, more preferably 500-800 rpm, and most preferably 600-800 rpm; the time is preferably 8-16 hours, and more preferably 12-16 hours. In an embodiment of the present invention, the speed of the mixing ball mill can be 600 rpm, and the time can be 12 hours.

[0075] After obtaining the carbon quantum dots and the polysaccharide-modified molybdenum disulfide nanosheets, the present invention secondly mixes the polysaccharide-modified molybdenum disulfide nanosheets, the carbon quantum dots and water for loading to obtain the reinforcing filler.

[0076] In the present invention, the mass ratio of the polysaccharide-modified molybdenum disulfide nanosheets to the carbon quantum dots is preferably 1:(0.2-0.5), more preferably 1:(0.2-0.3). In an embodiment of the present invention, the mass ratio of the polysaccharide-modified molybdenum disulfide nanosheets to the carbon quantum dots may be 1:0.2, 1:0.25 or 1:0.3.

[0077] In the present invention, the concentration of the polysaccharide-modified molybdenum disulfide nanosheets in the mixed solution obtained after the second mixing is preferably 5 to 30 mg / mL, more preferably 5 to 20 mg / mL. In an embodiment of the present invention, the concentration of the polysaccharide-modified molybdenum disulfide nanosheets in the mixed solution obtained after the second mixing can be 10 mg / mL.

[0078] In the present invention, there is no special limitation on the second mixing process, and it can be carried out using a process well known to those skilled in the art.

[0079] In the present invention, the loading is preferably carried out under reflux and stirring conditions, the reflux temperature is preferably 60-80°C; the stirring time is preferably 4-10 hours, more preferably 6-10 hours. In an embodiment of the present invention, the stirring time can be 8 hours.

[0080] After the loading is completed, the present invention also preferably includes filtering, washing and drying performed in sequence, and the drying is preferably freeze-drying; the present invention does not have any special limitation on the filtering, washing and freeze-drying processes, and the processes familiar to those skilled in the art can be used.

[0081] The present invention also provides a method for preparing the organic fiber composite gasket material described in the above technical solution, comprising the following steps:

[0082] mixing the reinforcing filler and the phenolic resin solution to obtain an impregnation solution;

[0083] The blended fiber fabric is placed in the impregnation liquid for impregnation, and then solidified to obtain the organic fiber composite lining material.

[0084] The invention mixes the reinforcing filler and the phenolic resin solution to obtain the impregnation solution.

[0085] In the present invention, the mass concentration of the phenolic resin solution is preferably 0.1 to 0.3 g / mL, more preferably 0.15 to 0.25 g / mL. In an embodiment of the present invention, the mass concentration of the phenolic resin solution can be 0.143 g / mL. In the present invention, the solvent in the phenolic resin solution is preferably two or more of ethanol, acetone and ethyl acetate. When the solvent in the phenolic resin solution is two or more of the above-mentioned specific selections, the present invention does not have any special restrictions on the ratio of the above-mentioned specific substances, and can be mixed in any ratio. In an embodiment of the present invention, the solvent in the phenolic resin solution can be ethanol, ethyl acetate and acetone in a volume ratio of 1:1:1.

[0086] The present invention does not have any special limitation on the mixing process, and the mixing process may be carried out by a process well known to those skilled in the art and ensured to be uniform.

[0087] After obtaining the impregnation liquid, the present invention places the blended fiber fabric in the impregnation liquid for impregnation, and then solidifies it to obtain the organic fiber composite lining material.

[0088] The present invention does not have any special limitation on the impregnation process, and the impregnation process may be carried out using a process well known to those skilled in the art.

[0089] After the impregnation is completed, the present invention dries the fabric prepreg obtained by the impregnation. The drying method is preferably baking. The present invention has no special limitation on the drying process, and the drying process can be carried out using a process well known to those skilled in the art.

[0090] After the drying is completed, the present invention also preferably repeats the above-mentioned impregnation and drying process, and the present invention does not have any special restrictions on the number of repetitions, as long as the mixture of the reinforcing filler and the phenolic resin accounts for 15-40% of the mass of the obtained fabric prepreg (i.e., the amount of glue). In an embodiment of the present invention, the mixture of the reinforcing filler and the phenolic resin accounts for 25% or 30% of the mass of the obtained fabric prepreg.

[0091] In the present invention, the reinforcing material and the phenolic resin in the fabric prepreg are coated on the surface of the blended fiber fabric as the continuous phase of the composite material.

[0092] In the present invention, the curing pressure is preferably 0.01-3MPa, more preferably 0.2-2.5MPa; the curing temperature is preferably 150-250°C, more preferably 180-200°C, and most preferably 185-190°C; the curing holding time is preferably 0.5-3h, more preferably 1-2.2h, and most preferably 1.5-2h; the heating rate to the curing temperature is preferably 3-10°C / min, more preferably 5-8°C / min. In an embodiment of the present invention, the curing pressure can be 0.3MPa, the temperature can be 185°C, the holding time can be 2h, and the heating rate can be 5°C / min.

[0093] In the present invention, in order to facilitate the friction performance test of the prepared organic fiber composite gasket material, before the curing, the obtained fabric prepreg is preferably pasted on the surface of the metal substrate using a phenolic resin adhesive and then cured. In the present invention, the metal substrate is preferably bearing steel, more preferably 9Cr18Mo, 9Cr18MoV, 9Cr18, 4Cr13 or 17-4PH. The present invention does not have any special restrictions on the pasting process, and the process well known to those skilled in the art can be used.

[0094] The present invention also provides the use of the organic fiber composite gasket material described in the above technical solution or the organic fiber composite gasket material prepared by the preparation method described in the above technical solution in an aircraft engine. The present invention does not have any special limitation on the method of the application, and the method well known to those skilled in the art can be used.

[0095] The organic fiber composite gasket material provided by the present invention and its preparation method and application are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0096] Example 1

[0097] Using polytetrafluoroethylene fiber as weft yarn and meta-aramid fiber as warp yarn, with a warp density of 400 yarns / 10 cm and a weft density of 350 yarns / 10 cm, plain weaving is used to manufacture a meta-aramid fiber-polytetrafluoroethylene fiber blended fabric; cutting the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric into small pieces of 100 mm×100 mm, immersing the pieces in 200 mL of a dopamine solution (pH=8.5, concentration of 2 mg / mL), stirring the mixture in an open state at room temperature for 20 h, and then washing and drying the blended fabric in sequence to obtain a blended fabric;

[0098] The blended fabric is immersed in 200 mL of a 0.2 mg / mL halloysite dispersion and stirred at room temperature for 16 hours, and then washed and dried in sequence to obtain a blended fiber fabric;

[0099] After mixing 3.2 g of citric acid, 2.6 g of urea and 80 mL of distilled water, the resulting mixture was transferred to a 200 mL high pressure hydrothermal autoclave equipped with a polytetrafluoroethylene liner, and subjected to hydrothermal reaction at 160 °C for 10 h. The mixture was centrifuged at 9000 rpm for 10 min to remove larger particles, and unreacted ions and small particles were removed by dialysis membrane, followed by freeze drying to obtain carbon quantum dots.

[0100] 1.0 g of molybdenum disulfide nanosheets and 1.0 g of hydroxypropyl cellulose were loaded into a ball mill and mixed and ball-milled (rotation speed of 600 r / min, 12 h) to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0101] After mixing 1 g of the polysaccharide-modified molybdenum disulfide nanosheets, 0.2 g of carbon quantum dots and 100 mL of water, the obtained mixed solution was transferred to a flask, refluxed for reaction at 70° C. for 8 h, cooled to room temperature, and centrifuged to obtain a lower layer of precipitate, which was filtered, washed and freeze-dried in sequence to obtain a reinforced filler;

[0102] 10 g of phenolic resin and 70 mL of a mixed solvent of ethanol, ethyl acetate and acetone in a volume ratio of 1:1:1 were mixed, and the obtained phenolic resin solution and 0.1 g of the reinforcing filler (the reinforcing filler accounted for 1 wt % of the phenolic resin glue) were mixed to obtain an impregnation solution;

[0103] Repeatingly impregnating and drying the blended fiber fabric in the impregnation liquid until the total mass fraction of the phenolic resin and the reinforcing filler in the obtained blended fabric prepreg reaches 30%, thereby obtaining a composite blended fabric prepreg;

[0104] The composite blended fabric prepreg is pasted on the surface of a 17-4PH metal substrate by using a phenolic resin binder, the temperature is raised to 185° C. at a heating rate of 5° C. / min, and cured for 2 hours under the condition of 0.3 MPa to obtain an organic fiber composite liner material (the mass percentage of the phenolic resin composite material is 30%, the mass ratio of the reinforcing filler to the phenolic resin in the phenolic resin composite material is 1:100, the mass ratio of the molybdenum disulfide nanosheets to the carbon quantum dots in the reinforcing filler is 1:0.2; the mass ratio of the blended fabric to the halloysite nanotubes in the blended fiber fabric is 100:1.4);

[0105] Figure 2 The morphology characterization diagrams of the carbon quantum dots and the reinforcing filler, wherein (a) and (b) are TEM images of the carbon quantum dots at different magnifications, and (c) and (d) are SEM images of the reinforcing filler at different magnifications. Figure 2 It can be seen that the carbon quantum dots have a very small nanoparticle size, and in the reinforcing filler, the carbon quantum dots are loaded on the surface of the molybdenum disulfide nanosheets.

[0106] Example 2

[0107] Using polytetrafluoroethylene fiber as weft yarn and meta-aramid fiber as warp yarn, with a warp density of 400 yarns / 10 cm and a weft density of 350 yarns / 10 cm, plain weaving is used to manufacture a meta-aramid fiber-polytetrafluoroethylene fiber blended fabric; cutting the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric into small pieces of 100 mm×100 mm, immersing the pieces in 200 mL of a dopamine solution (pH=8.5, concentration of 2 mg / mL), stirring the mixture in an open state at room temperature for 20 h, and then washing and drying the blended fabric in sequence to obtain a blended fabric;

[0108] The blended fabric is immersed in 200 mL of a 0.2 mg / mL halloysite dispersion and stirred at room temperature for 16 hours, and then washed and dried in sequence to obtain a blended fiber fabric;

[0109] After mixing 3.2 g of citric acid, 3.2 g of urea and 80 mL of distilled water, the resulting mixture was transferred to a 200 mL high pressure hydrothermal autoclave equipped with a polytetrafluoroethylene liner, and subjected to hydrothermal reaction at 160 °C for 10 h. The mixture was centrifuged at 9000 rpm for 10 min to remove larger particles, and unreacted ions and small particles were removed by dialyzing with a dialysis membrane, and then freeze-dried to obtain carbon quantum dots.

[0110] 1.0 g of molybdenum disulfide nanosheets and 1.0 g of hydroxypropyl cellulose were loaded into a ball mill and mixed and ball-milled (rotation speed of 600 r / min, 12 h) to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0111] After mixing 1 g of the polysaccharide-modified molybdenum disulfide nanosheets, 0.2 g of carbon quantum dots and 100 mL of water, the obtained mixed solution was transferred to a flask, refluxed for reaction at 70° C. for 8 h, cooled to room temperature, and centrifuged to obtain a lower layer of precipitate, which was filtered, washed and freeze-dried in sequence to obtain a reinforced filler;

[0112] 10 g of phenolic resin and 70 mL of a mixed solvent of ethanol, ethyl acetate and acetone in a volume ratio of 1:1:1 were mixed, and the obtained phenolic resin solution and 0.2 g of the reinforcing filler (the reinforcing filler accounted for 2 wt % of the phenolic resin glue) were mixed to obtain an impregnation solution;

[0113] Repeatingly impregnating and drying the blended fiber fabric in the impregnation liquid until the total mass fraction of the phenolic resin and the reinforcing filler in the obtained blended fabric prepreg reaches 30%, thereby obtaining a composite blended fabric prepreg;

[0114] The composite blended fabric prepreg is adhered to the surface of a 17-4PH metal substrate by using a phenolic resin adhesive, the temperature is raised to 185°C at a heating rate of 5°C / min, and the material is cured for 2 hours under the condition of 0.3MPa to obtain an organic fiber composite liner material (the mass percentage of the phenolic resin composite material is 30%, the mass ratio of the reinforcing filler to the phenolic resin in the phenolic resin composite material is 2:100, the mass ratio of the molybdenum disulfide nanosheets to the carbon quantum dots in the reinforcing filler is 1:0.2; the mass ratio of the blended fabric to the halloysite nanotubes in the blended fiber fabric is 100:1.4).

[0115] Example 3

[0116] Using polytetrafluoroethylene fiber as weft yarn and meta-aramid fiber as warp yarn, with a warp density of 400 yarns / 10 cm and a weft density of 350 yarns / 10 cm, plain weaving is used to manufacture a meta-aramid fiber-polytetrafluoroethylene fiber blended fabric; cutting the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric into small pieces of 100 mm×100 mm, immersing the pieces in 200 mL of a dopamine solution (pH=8.5, concentration of 2 mg / mL), stirring the mixture in an open state at room temperature for 20 h, and then washing and drying the blended fabric in sequence to obtain a blended fabric;

[0117] The blended fabric is immersed in 200 mL of a 0.3 mg / mL halloysite dispersion and stirred at room temperature for 16 hours, and then washed and dried in sequence to obtain a blended fiber fabric;

[0118] After mixing 3.2 g of citric acid, 2.0 g of urea and 80 mL of distilled water, the resulting mixture was transferred to a 200 mL high pressure hydrothermal autoclave equipped with a polytetrafluoroethylene liner, and subjected to hydrothermal reaction at 160 °C for 10 h. The mixture was centrifuged at 9000 rpm for 10 min to remove larger particles, and unreacted ions and small particles were removed by dialysis membrane, followed by freeze drying to obtain carbon quantum dots.

[0119] 1.0 g of molybdenum disulfide nanosheets and 1.0 g of hydroxypropyl cellulose were loaded into a ball mill and mixed and ball-milled (rotation speed of 600 r / min, 12 h) to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0120] After mixing 1 g of the polysaccharide-modified molybdenum disulfide nanosheets, 0.25 g of carbon quantum dots and 100 mL of water, the obtained mixed solution was transferred to a flask, refluxed for reaction at 70° C. for 8 h, cooled to room temperature, and centrifuged to obtain a lower layer of precipitate, which was filtered, washed and freeze-dried in sequence to obtain a reinforced filler;

[0121] 10 g of phenolic resin and 70 mL of a mixed solvent of ethanol, ethyl acetate and acetone in a volume ratio of 1:1:1 were mixed, and the obtained phenolic resin solution and 0.15 g of the reinforcing filler (the reinforcing filler accounted for 1.5 wt % of the phenolic resin glue) were mixed to obtain an impregnation solution;

[0122] Repeatingly impregnating and drying the blended fiber fabric in the impregnation solution until the total mass fraction of the phenolic resin and the reinforcing filler in the obtained blended fabric prepreg reaches 30%, thereby obtaining a composite blended fabric prepreg;

[0123] The composite blended fabric prepreg is adhered to the surface of a 17-4PH metal substrate by using a phenolic resin adhesive, the temperature is raised to 185°C at a heating rate of 5°C / min, and the material is cured for 2 hours under the condition of 0.3MPa to obtain an organic fiber composite liner material (the mass percentage of the phenolic resin composite material is 30%, the mass ratio of the reinforcing filler to the phenolic resin in the phenolic resin composite material is 1.5:100, the mass ratio of molybdenum disulfide nanosheets to carbon quantum dots in the reinforcing filler is 1:0.25; the mass ratio of the blended fabric to the halloysite nanotubes in the blended fiber fabric is 100:1.5).

[0124] Example 4

[0125] Using polytetrafluoroethylene fiber as weft yarn and meta-aramid fiber as warp yarn, with a warp density of 400 yarns / 10 cm and a weft density of 350 yarns / 10 cm, plain weaving is used to manufacture a meta-aramid fiber-polytetrafluoroethylene fiber blended fabric; cutting the meta-aramid fiber-polytetrafluoroethylene fiber blended fabric into small pieces of 100 mm×100 mm, immersing the pieces in 200 mL of a dopamine solution (pH=8.5, concentration of 2 mg / mL), stirring the mixture in an open state at room temperature for 20 h, and then washing and drying the blended fabric in sequence to obtain a blended fabric;

[0126] The blended fabric is immersed in 200 mL of a 0.4 mg / mL halloysite dispersion and stirred at room temperature for 16 hours, and then washed and dried in sequence to obtain a blended fiber fabric;

[0127] After mixing 3.2 g of citric acid, 2.0 g of urea and 80 mL of distilled water, the resulting mixture was transferred to a 200 mL high pressure hydrothermal autoclave equipped with a polytetrafluoroethylene liner, and subjected to hydrothermal reaction at 160 °C for 10 h. The mixture was centrifuged at 9000 rpm for 10 min to remove larger particles, and unreacted ions and small particles were removed by dialysis membrane, followed by freeze drying to obtain carbon quantum dots.

[0128] 1.0 g of molybdenum disulfide nanosheets and 1.0 g of hydroxypropyl cellulose were loaded into a ball mill and mixed and ball-milled (rotation speed of 600 r / min, 12 h) to obtain polysaccharide-modified molybdenum disulfide nanosheets;

[0129] After mixing 1 g of the polysaccharide-modified molybdenum disulfide nanosheets, 0.3 g of carbon quantum dots and 100 mL of water, the obtained mixed solution was transferred to a flask, refluxed for reaction at 70° C. for 8 h, cooled to room temperature, and centrifuged to obtain a lower layer of precipitate, which was filtered, washed and freeze-dried in sequence to obtain a reinforced filler;

[0130] 10 g of phenolic resin and 70 mL of a mixed solvent of ethanol, ethyl acetate and acetone in a volume ratio of 1:1:1 were mixed, and the obtained phenolic resin solution and 0.1 g of the reinforcing filler (the reinforcing filler accounted for 1 wt % of the phenolic resin glue) were mixed to obtain an impregnation solution;

[0131] Repeatingly impregnating and drying the blended fiber fabric in the impregnation solution until the total mass fraction of the phenolic resin and the reinforcing filler in the obtained blended fabric prepreg reaches 25%, thereby obtaining a composite blended fabric prepreg;

[0132] The composite blended fabric prepreg is adhered to the surface of a 17-4PH metal substrate by using a phenolic resin adhesive, the temperature is raised to 185°C at a heating rate of 5°C / min, and the material is cured for 2 hours under the condition of 0.3MPa to obtain an organic fiber composite liner material (the mass percentage of the phenolic resin composite material is 25%, the mass ratio of the reinforcing filler to the phenolic resin in the phenolic resin composite material is 1:100, the mass ratio of molybdenum disulfide nanosheets to carbon quantum dots in the reinforcing filler is 1:0.3; the mass ratio of the blended fabric to the halloysite nanotubes in the blended fiber fabric is 100:1.6).

[0133] Comparative Example 1

[0134] Referring to Example 1, the difference is that the preparation of the reinforcing filler and the mixing process of the reinforcing filler with the phenolic resin solution are omitted, and the organic fiber composite liner material with the interface modified by the halloysite nanotubes without adding the reinforcing filler is prepared.

[0135] Comparative Example 2

[0136] Refer to Example 1, the difference is that the preparation process of the blended fiber fabric is omitted, and the organic fiber composite gasket material reinforced only with reinforcing fillers is obtained.

[0137] Comparative Example 3

[0138] Refer to Example 1, the difference is that the preparation process of the blended fiber fabric and the reinforcing filler is omitted, and the organic fiber composite gasket material without reinforcing filler reinforcement and the blended fabric without surface treatment is obtained.

[0139] Test Case

[0140] Friction and wear performance test: Test conditions: pressure of 102MPa, sliding friction linear velocity of 0.26m / s, time of 120min, temperature of room temperature, using Xuanwu No. 3 friction and wear tester, with 2mm diameter 45# steel seat friction pair, the friction coefficient is automatically output after the collected data is processed by the connected computer. The wear depth of the organic fiber composite lining material is measured by a digital display altimeter, and then the wear volume is calculated. The specific wear rate of the organic fiber composite lining material is calculated by the formula K=ΔV / P·L, and the friction coefficient is automatically derived by the instrument, where K is the specific wear rate; ΔV is the wear volume (m 3 ); P is the applied load (N); L is the sliding distance (m). The test results are shown in Table 1 and Figure 1 As shown, Figure 1 The wear rate and friction coefficient diagram of the organic fiber composite liner material described in Comparative Example 2 and Example 1 ((a) is the friction coefficient diagram, (b) is the wear rate diagram):

[0141] Table 1 Friction and wear data of organic fiber composite lining materials prepared in Examples 1 to 4 and Comparative Examples 1 to 2

[0142]

[0143] From Table 1 and Figure 1 It can be seen that the wear rate of the organic fiber composite liner material prepared in Example 1 is 0.87×10 - 14 m 3 (Nm) -1 , the friction coefficient is 0.060; compared with comparative example 2, they are reduced by 61% and 23% respectively, achieving a significant improvement in the wear resistance and lubrication properties of the organic fiber composite liner material.

[0144] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An organic fiber composite lining material, characterized in that: A composite material comprising a blended fiber fabric and a phenolic resin composited in the blended fiber fabric; The phenolic resin composite material comprises a phenolic resin and a reinforcing filler dispersed in the phenolic resin; The reinforcing filler comprises molybdenum disulfide nanosheets and carbon quantum dots loaded on the surface of the molybdenum disulfide nanosheets; The blended fiber fabric comprises a dopamine-modified blended fabric and halloysite nanotubes loaded on the surface of the dopamine-modified blended fabric.

2. The organic fiber composite gasket material according to claim 1, characterized in that: The preparation method of the reinforcing filler comprises the following steps: Firstly, citric acid, urea and water are mixed and subjected to a hydrothermal reaction to obtain carbon quantum dots; Molybdenum disulfide nanosheets and hydroxypropyl cellulose are mixed and ball-milled to obtain polysaccharide-modified molybdenum disulfide nanosheets; The polysaccharide-modified molybdenum disulfide nanosheets, carbon quantum dots and water are mixed for a second time and loaded to obtain the reinforced filler.

3. The organic fiber composite gasket material according to claim 2, characterized in that: The mass ratio of citric acid to urea is (0.5-1): (0.5-1); The concentration of citric acid in the mixed solution obtained by the first mixing is 20 to 60 mg / mL; The temperature of the hydrothermal reaction is 120-180°C and the time is 8-12h; After the hydrothermal reaction is completed, centrifugation, dialysis and drying are performed in sequence; the centrifugation speed is 8000-10000 rpm, and the time is 8-12 minutes.

4. The organic fiber composite gasket material according to claim 2, characterized in that: The mass ratio of the molybdenum disulfide nanosheets to hydroxypropyl cellulose is 1:(0.5-1); The rotating speed of the mixing ball mill is 400-800 rpm, and the time is 8-16 hours.

5. The organic fiber composite gasket material according to claim 2, characterized in that: The mass ratio of the polysaccharide-modified molybdenum disulfide nanosheets to the carbon quantum dots is 1:(0.2-0.5); The loading is carried out under stirring conditions, and the stirring time is 4 to 10 hours.

6. The organic fiber composite gasket material according to claim 1, characterized in that: The preparation method of the blended fiber fabric comprises the following steps: The dopamine-modified blended fabric is adsorbed in a halloysite nanotube dispersion to obtain the blended fiber fabric.

7. The organic fiber composite gasket material according to claim 6, characterized in that: The preparation method of the dopamine-modified blended fabric comprises the following steps: Modifying the blended fabric in a dopamine solution to obtain the dopamine-modified blended fabric; The concentration of the dopamine solution is 1-3 mg / mL, and the modification time is 16-24 hours.

8. The organic fiber composite gasket material according to claim 6, characterized in that: The concentration of the halloysite nanotube dispersion is 0.2 to 0.6 mg / mL; The adsorption time is 16 to 24 hours.

9. The method for preparing the organic fiber composite gasket material according to any one of claims 1 to 8, characterized in that: The following steps are involved: mixing the reinforcing filler and the phenolic resin solution to obtain an impregnation solution; The blended fiber fabric is placed in the impregnation liquid for impregnation, and then solidified to obtain the organic fiber composite lining material.

10. Use of the organic fiber composite gasket material according to any one of claims 1 to 8 or the organic fiber composite gasket material prepared by the preparation method according to claim 9 in aircraft engines.

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