CN114179472A - Low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material and preparation thereof - Google Patents
Low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material and preparation thereof Download PDFInfo
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Abstract
The invention relates to a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material and a preparation method thereof, wherein the preparation method comprises the following steps: 1) preparing polyethylene multilayer fibers with polyethylene fibers as an outer layer and low molecular weight polyolefin nanocomposite as a core layer by using a co-extrusion molding technology; 2) extracting and stretching polyethylene multilayer fibers, and then compounding the polyethylene multilayer fibers with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers to prepare composite fiber cloth; 3) and fusing and compounding the composite fiber cloth and the ultra-high molecular weight polyethylene resin. Compared with the prior art, the low molecular weight polyolefin nano composite layer can be released to a friction interface through the polyethylene fiber layer under pressure to form a lubricating layer, so that a very low friction coefficient is realized, and the finally obtained composite material also has a low wear rate by compounding with the ultra-high molecular weight polyethylene fiber.
Description
Technical Field
The invention belongs to the technical field of ultra-high molecular weight polyethylene fibers, and relates to a low-friction coefficient ultra-high molecular weight polyethylene fiber composite material and a preparation method thereof.
Background
With the development of economy and society, a series of problems such as abrasion, lubrication, material and energy consumption and the like caused by friction have great influence on the development of the society and the economy. The statistics of the world friction society show that the friction loses more than 1/3 of world disposable energy, and the loss caused by the abrasion accounts for about 1 percent of the total value of national production every year.
According to the current market research, the current wear-resistant materials in the market are mainly ultra-high molecular weight polyethylene, nylon and polytetrafluoroethylene materials. The wear resistance of the ultra-high molecular weight polyethylene (UHMWPE) is higher than that of carbon steel and brass by a plurality of times and is higher than that of common polyethylene by a plurality of times; the friction coefficient is close to that of Polytetrafluoroethylene (PTFE) and is smaller than that of other plastics; the water absorption rate is lower than that of other engineering plastics; the anti-adhesion capability is good; the impact resistance is very good; the tensile strength is high; the corrosion resistance is good; the low temperature resistance is good; low density and low cost.
In recent years, the demand for environmental protection is continuously promoted, and oil-free lubrication is a key research direction. The friction coefficient of ultra-high molecular weight polyethylene is still large under the condition of oil-free lubrication, and the application of the ultra-high molecular weight polyethylene under the condition of oil-free lubrication is limited, so that the further reduction of the friction coefficient is an important subject.
At present, the method for reducing the friction coefficient of the ultra-high molecular weight polyethylene is mainly blending compounding. Patent CN107338094A discloses an ultra-high molecular weight polyethylene multi-element nano composite material suitable for use under water lubrication condition, which is prepared by adding reinforcing fibers into an ultra-high molecular weight polyethylene material and simultaneously adding friction-hydrolysable nano particles with modified surfaces. The composite material has good wear resistance under the water lubrication working condition, and when the composite material is used in a seawater medium, the boundary film of a friction interface can effectively protect the dual surface of the metal and reduce the corrosive wear of the metal while reducing the wear of the polymer composite material. However, it cannot be applied to oil-free lubrication conditions, and the application range is limited.
Polypropylene (PP) and MoS were prepared by compression molding method in Lihuilin project group of Sichuan university (journal of tribology 2004,24(1):21-24)2The filled ultra-high molecular weight polyethylene composite material shows that: addition of MoS alone2The wear resistance of UHMWPE can be improved, but the friction coefficient is increased and the mechanical property is reduced; and PP and MoS are used2The processing performance can be obviously improved by modifying UHMWPE; 72.7% UHMWPE/18.2% PP/9.1% MoS2The processing performance, the bearing capacity and the long-term wear resistance of the ternary composite material are obviously superior to those of UHMWPE; UHMWPE generally experiences mainly adhesive and fatigue wear, while 72.7% UHMWPE/18.2% PP/9.1% MoS2The ternary composite material undergoes only slight plastic deformation when the same steel is in friction-pair under the same test conditions. This result reduces the coefficient of friction of UHMWPE products while significantly increasing the wear resistance of UHMWPE, from 0.19 to 0.16, but still at a higher coefficient of friction at a distance of 0.05-0.08 oil lubrication, and still needs further improvement.
Disclosure of Invention
The invention aims to provide a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material comprises the following steps:
1) preparing polyethylene multilayer fibers with polyethylene fibers as an outer layer and low molecular weight polyolefin nanocomposite as a core layer by using a co-extrusion molding technology;
2) extracting and stretching polyethylene multilayer fibers, and then compounding the polyethylene multilayer fibers with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers to prepare composite fiber cloth;
3) and melting and compounding the composite fiber cloth and the ultrahigh molecular weight polyethylene resin to obtain the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material.
Further, in step 1), the polyethylene fiber of the outer layer of the polyethylene multilayer fiber consists of polyethylene fiber with molecular weight of 8 × 104-30×104g/mol, molecular weight distribution<3.0 of polyethylene resin.
Further, the polyethylene resin is swollen by a solvent in advance; the solvent comprises one or two of paraffin oil and white oil; in the solvent swelling process, the concentration of the polyethylene resin is 60 wt% -80 wt%.
Further, in the step 1), in the polyethylene multilayer fiber, the low molecular weight polyolefin nanocomposite material of the core layer is prepared by mixing low molecular weight polyolefin, an organic lubricant and a nanomaterial, wherein the mass ratio of the low molecular weight polyolefin, the organic lubricant and the nanomaterial is (60-80): (19-39.9): 0.1-1).
Further, the low molecular weight polyolefin comprises one or more of polyethylene wax, oleamide and erucamide, the organic lubricant comprises one or two of white oil and paraffin oil, and the nano material comprises one or more of graphene, graphite and molybdenum disulfide.
Further, in the step 2), in the extraction stretching process, the extraction solvent comprises one or two of n-hexane and n-heptane, and the stretching ratio is 8-60 times.
Further, in the step 2), the extracted and stretched polyethylene multilayer fiber is compounded with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers at the temperature of 80-150 ℃, and the mass ratio of the ultrahigh molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is (6-8): 1 (2-4); the molecular weight of the low molecular weight polyethylene is 1 multiplied by 104-10×104g/mol, as an adhesive when the ultra-high molecular weight polyethylene fiber and the polyethylene multilayer fiber are compounded.
Further, in the step 3), the composite fiber cloth is compounded with the surface of the ultra-high molecular weight polyethylene resin through injection molding or compression molding, the temperature of the composite mold is 90-150 ℃, and then the composite fiber cloth is cooled and shaped at the mold temperature of 30-60 ℃.
Further, the molecular weight of the ultra-high molecular weight polyethylene is 100 x 104-900×104g/mol。
The low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared by adopting the method.
According to the invention, the polyethylene multilayer fibers are extracted and stretched and then compounded with the ultrahigh molecular weight polyethylene fibers to prepare the composite fiber cloth, then the composite fiber cloth is compounded with UHMWPE resin as a surface layer, the UHMWPE resin has excellent wear resistance, impact resistance and low temperature resistance as a base material, and the composite fiber cloth has excellent friction coefficient and wear resistance.
Compared with the prior art, in the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material prepared by the invention, the polyethylene multilayer fibers have a double-layer structure, the outer polyethylene fibers have certain porosity after extraction and stretching, the inner low molecular weight polyolefin nano composite material has excellent lubricating property, and the low molecular weight polyolefin nano composite layer can be released to a friction interface through the polyethylene fiber layer under pressure to form a lubricating layer, so that the very low friction coefficient is realized, and meanwhile, the finally obtained composite material also has lower wear rate by compounding with the ultrahigh molecular weight polyethylene fibers.
Drawings
FIG. 1 is a schematic diagram of the present invention for preparing polyethylene multilayer fiber.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The invention provides a preparation method of a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material, which comprises the following steps:
1) as shown in fig. 1, a polyethylene multilayer fiber with an outer layer of polyethylene fiber and a core layer of low molecular weight polyolefin nanocomposite is prepared by a co-extrusion molding technique;
2) extracting and stretching polyethylene multilayer fibers, and then compounding the polyethylene multilayer fibers with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers to prepare composite fiber cloth;
3) and melting and compounding the composite fiber cloth and the ultrahigh molecular weight polyethylene resin to obtain the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material.
In the step 1), the outer layer of the polyethylene multilayer fiber is polymerizedEthylene fiber with molecular weight of 8 x 104-30×104g/mol, molecular weight distribution<3.0 of polyethylene resin. The polyethylene resin is swelled by solvent in advance; the solvent comprises one or two of paraffin oil and white oil; in the solvent swelling process, the concentration of the polyethylene resin is 60 wt% -80 wt%. In the polyethylene multilayer fiber, the low molecular weight polyolefin nanocomposite material of the core layer is prepared by mixing low molecular weight polyolefin, organic lubricant and nanomaterial, and the mass ratio of the low molecular weight polyolefin to the organic lubricant to the nanomaterial is (60-80) to (19-39.9) to (0.1-1). The low molecular weight polyolefin comprises one or more of polyethylene wax, oleamide and erucamide, the organic lubricant comprises one or two of white oil and paraffin oil, and the nano material comprises one or more of graphene, graphite and molybdenum disulfide.
In the step 2), in the extraction and stretching process, the extraction solvent comprises one or two of n-hexane and n-heptane, and the stretching ratio is 8-60 times. Compounding the extracted and stretched polyethylene multilayer fiber with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fiber at 80-150 deg.c in the weight ratio of 6-8 to 1; the molecular weight of the low molecular weight polyethylene is 1X 104-10×104g/mol。
In the step 3), the composite fiber cloth is compounded with the surface of the ultra-high molecular weight polyethylene resin through injection molding or compression molding, the temperature of a composite mold is 90-150 ℃, and then the composite fiber cloth is cooled and shaped at the mold temperature of 30-60 ℃.
Wherein the molecular weight of the ultra-high molecular weight polyethylene is 100 × 104-900×104g/mol。
The invention also provides a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material, which is prepared by adopting the method.
Example 1:
the UHMWPE base material of this example has a molecular weight of 100X 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. First by extrusionPreparing multi-layer polyethylene fibre, co-extruding low-molecular polyolefine nano composite material in fibre core layer, and preparing multi-layer polyethylene fibre with molecular weight of 8X 104g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is respectively 60: 39.9: 0.1, the low molecular weight polyolefin is polyethylene wax, the organic lubricant is white oil, and the nano material is graphene; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is paraffin oil, and the concentration of the ethylene resin is 60 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent is normal hexane, the stretching ratio is 9 times, compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 80 ℃ to prepare composite fiber cloth, wherein the molecular weight of the low molecular weight polyethylene LLDPE is 1 multiplied by 104g/mol, the mass ratio of the ultra-high molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is 8: 2: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of a compound die is 90 ℃, then the temperature of a cooling shaping die is 30 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling and shaping.
The friction coefficients of the composites prepared are shown in table 1.
Example 2:
the UHMWPE base material of this example has a molecular weight of 300X 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. Firstly, preparing polyethylene multilayer fiber by extrusion molding, co-extruding a low molecular weight polyolefin nano composite material in a fiber core layer, and preparing the polyethylene resin used for preparing the multilayer fiber with the molecular weight of 20 multiplied by 104g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is respectively 68.2: 31.5: 0.3, the low molecular weight polyolefin is oleamide, havingThe organic lubricant is white oil, and the nano material is molybdenum disulfide; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is paraffin oil, and the concentration of the polyethylene resin is 68 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent is n-heptane, the stretching ratio is 20 times, compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 90 ℃ to prepare fiber cloth, wherein the molecular weight of the low molecular weight polyethylene LLDPE is 6 multiplied by 104g/mol, 7.5 of ultra-high molecular weight polyethylene fiber, polyethylene multilayer fiber, low molecular weight polyethylene: 2.5: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of the compound die is 90 ℃, then the temperature of the cooling shaping die is 40 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling shaping.
The friction coefficients of the composites prepared are shown in table 1.
Example 3:
the molecular weight of the UHMWPE base stock of the embodiment is 600 multiplied by 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. Firstly, preparing polyethylene multilayer fiber by extrusion molding, co-extruding a low molecular weight polyolefin nano composite material by a fiber core layer, and preparing the polyethylene resin used for preparing the multilayer fiber with the molecular weight of 26 multiplied by 104g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is 70: 29.5: 0.5, the low molecular weight polyolefin is erucamide, the organic lubricant is paraffin oil, and the nano material is graphite; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is paraffin oil, and the concentration of the polyethylene resin is 70 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent is normal hexane, the stretching ratio is 26 times, and compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 108 ℃ to prepare the composite materialThe molecular weight of the fiber-out cloth and the low molecular weight polyethylene LLDPE is 8 multiplied by 104g/mol, the mass ratio of the ultra-high molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is 7: 3: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of a compound die is 108 ℃, then the temperature of a cooling shaping die is 39 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling and shaping.
The friction coefficients of the composites prepared are shown in table 1.
Example 4:
the molecular weight of the UHMWPE base stock of the embodiment is 800 multiplied by 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. Firstly, preparing polyethylene multilayer fiber by extrusion molding, co-extruding a low molecular weight polyolefin nano composite material in a fiber core layer, and preparing the polyethylene resin with the molecular weight of 28 multiplied by 10 used for preparing the multilayer fiber4g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is respectively 75.0: 14.0: 1, using low molecular weight polyolefin as oleamide, using white oil as an organic lubricant, and using graphene as a nano material; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is white oil, and the concentration of the polyethylene resin is 75 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent is n-heptane, the stretching ratio is 38 times, compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 118 ℃ to prepare fiber cloth, wherein the molecular weight of the low molecular weight polyethylene LLDPE is 9 multiplied by 104g/mol, the mass ratio of the ultra-high molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is 6.5: 3.5: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of a compound die is 129 ℃, then the temperature of a cooling setting die is 50 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling setting.
The friction coefficients of the composites prepared are shown in table 1.
Example 5:
the UHMWPE base material of this example has a molecular weight of 900X 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. Firstly, preparing polyethylene multilayer fiber by extrusion molding, co-extruding a low molecular weight polyolefin nano composite material in a fiber core layer, and preparing the polyethylene resin used for preparing the multilayer fiber with the molecular weight of 29 multiplied by 104g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is respectively 80: 19.9: 0.1, the low molecular weight polyolefin is polyethylene wax, the organic lubricant is white oil, and the nano material is graphene; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is paraffin oil, and the concentration of the polyethylene resin is 75 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent is n-heptane, the stretching ratio is 50 times, compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 150 ℃ to prepare fiber cloth, wherein the molecular weight of the low molecular weight polyethylene LLDPE is 8 multiplied by 104g/mol, the mass ratio of the ultra-high molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is 6.5: 3.5: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of a compound die is 139 ℃, then the temperature of a cooling shaping die is 60 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling and shaping.
The friction coefficients of the composites prepared are shown in table 1.
Example 6:
the UHMWPE base material of this example has a molecular weight of 900X 104g/mol, can be compounded with the fiber cloth through mould pressing or injection molding. First using an extruderThe polyethylene multilayer fiber is prepared by molding, the fiber core layer is co-extruded with the low molecular weight polyolefin nano composite material, and the polyethylene resin used for preparing the multilayer fiber has the molecular weight of 30 multiplied by 104g/mol, molecular weight distribution<3.0, the low molecular weight polyolefin nano composite melt co-extruded by the fiber core layer is a composite product of low molecular weight polyolefin, organic lubricant and nano material, and the mixture ratio is respectively 80: 19.8: 0.2, the low molecular weight polyolefin is oleamide, the organic lubricant is white oil, and the nano material is molybdenum disulfide; the polyethylene resin used for extrusion molding needs to be swelled by a solvent, the solvent is white oil, and the concentration of the polyethylene resin is 80 wt%.
Extracting and stretching the polyethylene multilayer fiber prepared after co-extrusion, wherein the extraction solvent comprises normal hexane and normal heptane, the stretching ratio is 60 times, compounding the fiber prepared after extraction and stretching with low molecular weight polyethylene LLDPE and UHMWPE fiber at 118 ℃ to prepare fiber cloth, and the molecular weight of the low molecular weight polyethylene LLDPE is 10 multiplied by 104g/mol, the mass ratio of the ultra-high molecular weight polyethylene fiber to the polyethylene multilayer fiber to the low molecular weight polyethylene is 6: 4: 1.
and finally, presetting composite fiber cloth on the surface of the die, fusing and compounding the composite fiber cloth with the ultra-high molecular weight polyethylene resin, wherein the surface compounding of the fiber cloth adopts variable die temperature: firstly, the temperature of a compound die is 150 ℃, then the temperature of a cooling shaping die is 60 ℃, and finally, the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared after complete cooling shaping.
The friction coefficients of the composites prepared are shown in table 1.
The UHMWPE pure fiber cloth in the prior art is taken as a comparative example, namely comparative example 1 (molecular weight is 300 ten thousand), comparative example 2 (molecular weight is 600 ten thousand) and comparative example 3 (molecular weight is 900 ten thousand), and the friction coefficients are shown in Table 1.
TABLE 1 UHMWPE fiber article coefficient of friction
As can be seen from Table 1, compared with UHMWPE pure fiber cloth, the friction coefficient of the ultra-high molecular weight polyethylene fiber composite material prepared by the invention can be reduced to about 0.06 at the lowest, and the ultra-high molecular weight polyethylene fiber composite material has excellent friction coefficient and better application prospect.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A preparation method of a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is characterized by comprising the following steps:
1) preparing polyethylene multilayer fibers with polyethylene fibers as an outer layer and low molecular weight polyolefin nanocomposite as a core layer by using a co-extrusion molding technology;
2) extracting and stretching polyethylene multilayer fibers, and then compounding the polyethylene multilayer fibers with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers to prepare composite fiber cloth;
3) and melting and compounding the composite fiber cloth and the ultrahigh molecular weight polyethylene resin to obtain the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material.
2. The method for preparing a low friction coefficient ultrahigh molecular weight polyethylene fiber composite material according to claim 1, wherein in the step 1), the polyethylene fiber of the outer layer of the polyethylene multilayer fiber is made of polyethylene with a molecular weight of 8 x 104-30×104g/mol, molecular weight distribution<3.0 of polyethylene resin.
3. The method for preparing a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material according to claim 2, wherein the polyethylene resin is swollen with a solvent in advance; the solvent comprises one or two of paraffin oil and white oil; in the solvent swelling process, the concentration of the polyethylene resin is 60 wt% -80 wt%.
4. The method as claimed in claim 1, wherein in step 1), the low molecular weight polyolefin nanocomposite of the core layer of the polyethylene multilayer fiber is prepared by mixing low molecular weight polyolefin, organic lubricant and nanomaterial at a mass ratio of (60-80): (19-39.9): 0.1-1.
5. The method as claimed in claim 4, wherein the low molecular weight polyolefin comprises one or more of polyethylene wax, oleamide, and erucamide, the organic lubricant comprises one or more of white oil and paraffin oil, and the nanomaterial comprises one or more of graphene, graphite, and molybdenum disulfide.
6. The method for preparing a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material according to claim 1, wherein in the step 2), the extraction solvent comprises one or two of n-hexane and n-heptane in the extraction and stretching process, and the stretching ratio is 8-60 times.
7. The method for preparing a low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material as claimed in claim 1, wherein in the step 2), the extracted and stretched polyethylene multilayer fibers are compounded with low molecular weight polyethylene and ultrahigh molecular weight polyethylene fibers at 80-150 ℃, and the mass ratio of the ultrahigh molecular weight polyethylene fibers to the polyethylene multilayer fibers to the low molecular weight polyethylene is (6-8): 1 (2-4): 1; the molecular weight of the low molecular weight polyethylene is 1 multiplied by 104-10×104g/mol as ultra high molecular weight polyethylene fibers andpolyethylene multilayer fiber composite process adhesive.
8. The method for preparing the ultra-high molecular weight polyethylene fiber composite material with the low friction coefficient as claimed in claim 1, wherein in the step 3), the composite fiber cloth is compounded with the surface of the ultra-high molecular weight polyethylene resin through injection molding or compression molding, the temperature of the compound mold is 90-150 ℃, and then the compound fiber cloth is cooled and shaped at the mold temperature of 30-60 ℃.
9. The method for preparing a low friction coefficient ultra-high molecular weight polyethylene fiber composite material according to claim 1, wherein the molecular weight of the ultra-high molecular weight polyethylene is 100 x 104-900×104g/mol。
10. A low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material, characterized in that the low-friction coefficient ultrahigh molecular weight polyethylene fiber composite material is prepared by the method as claimed in any one of claims 1 to 9.
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| CN104711696A (en) * | 2015-03-04 | 2015-06-17 | 江苏神鹤科技发展有限公司 | Heat-resisting antistatic UHMWPE (ultra high molecular weight polyethylene) fiber and preparation method thereof |
| CN105001487A (en) * | 2015-06-29 | 2015-10-28 | 上海化工研究院 | Preparation method of multipurpose injection molding-grade ultrahigh molecular weight polyethylene functional composite materials |
| CN113279078A (en) * | 2021-05-24 | 2021-08-20 | 上海化工研究院有限公司 | Modified ultra-high molecular weight polyethylene fiber and preparation method thereof |
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| CN104711696A (en) * | 2015-03-04 | 2015-06-17 | 江苏神鹤科技发展有限公司 | Heat-resisting antistatic UHMWPE (ultra high molecular weight polyethylene) fiber and preparation method thereof |
| CN105001487A (en) * | 2015-06-29 | 2015-10-28 | 上海化工研究院 | Preparation method of multipurpose injection molding-grade ultrahigh molecular weight polyethylene functional composite materials |
| CN113279078A (en) * | 2021-05-24 | 2021-08-20 | 上海化工研究院有限公司 | Modified ultra-high molecular weight polyethylene fiber and preparation method thereof |
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