CN111333986A - Chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material and preparation method thereof - Google Patents
Chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material and a preparation method thereof, and the PMMA/UHMWPE alloy material is specifically composed of the following raw materials in parts by weight: 45-85 parts of PMMA resin, 10-25 parts of UHMWPE resin, 3-10 parts of nano functional master batch, 0.5-3 parts of external lubricant and 2-4 parts of antioxidantRefers to a monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer nanometer functional master batch obtained by a monolayer re-stacking method. The invention prepares the nano-grade molybdenum disulfide single-layer body (MoS)2the-1F) and the ethylene-methyl acrylate copolymer intercalation composite material successfully improves the surface wear resistance of the PMMA material, plays a role in UHMWPE interface compatibilization, solves the phase separation problem of the PMMA material in polar PMMA resin, and under the combined action of the two factors, the surface friction coefficient and the abrasion quality of the obtained PMMA/UHMWPE alloy material are obviously improved, and the surface of the material shows good self-lubricating property.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material and a preparation method thereof.
Background
Polymethyl methacrylate (PMMA) is one of the most commonly used decorative parts in the fields of automobiles, industrial electronics, household appliances, etc. due to its special molecular chain chemical structure. The macromolecular chains in PMMA have flexible olefin groups and bulky side chain ethyl acetate groups, so that the PMMA has good flexibility and impact resistance, has high transparency which is beyond the reach of other polymer materials, is even higher than that of the traditional inorganic glass materials, and is also called organic glass; however, such chemical structures have the drawback that the chemical structures are not avoidable by themselves, that is, the surfaces are soft, easily scratched and not wear-resistant, and the chemical resistance is low due to the non-chemical resistance and easy chain scission and degradation of ester groups, which causes serious obstacles to the deep popularization of the chemical structures in wider fields.
The existing PMMA surface abrasion-resistant modification method is to add some abrasion-resistant modification auxiliary agents through a physical blending method to improve the surface hardness of the material. CN106905649A mentions PMMA composite material with improved wear resistance, which is realized by adding a certain amount of nano silica and a small amount of siloxane lubricant, however, the modification effect depends heavily on the dispersion degree of nano silica in PMMA, while in fact traditional melt blending basic method can not realize well the dispersion degree of silica in resin matrix to nano level; although the problem of dispersion of nanocellulose is solved by aerogel in CN110079041A, the effect of surface stiffening and hardness improvement is not stable because the size of the filler is relatively small; CN107057253A is to add polyformaldehyde POM resin with high wear resistance to achieve the purpose of modification, the processing window of POM is too narrow, and the alloy compatibility in PMMA is not good. More importantly, the existing cases of PMMA wear resistance modification only focus on improving wear resistance, but cannot give consideration to the synergistic improvement of other performance defects of PMMA, such as poor chemical solvent resistance, easy chemical degradation and the like, so that the serious performance trouble is brought to the further expansion and application of PMMA and PMMA alloys in the field of decorative parts with high apparent requirements on high glossiness, attractiveness, high stability and the like.
Disclosure of Invention
The invention aims to fill the blank of the prior technical scheme, provide a PMMA/UHMWPE alloy material with high wear resistance and excellent chemical solvent resistance, and prepare single-layer molybdenum disulfide master batch (MoS) compounded by multi-block copolymer intercalation of ethylene-methyl acrylate by an efficient and directional magnetic stirring-ultrasonic dispersion method2IC), successfully solves the problems of compatibility and phase distribution of the UHMWPE dispersed phase which is low in polarity and difficult to disperse in the PMMA continuous phase, and is beneficial to exerting the excellent characteristics of wear resistance, self lubrication and high solvent resistance of the UHMWPE material, and meanwhile, a single-layer molybdenum disulfide (MoS) in the master batch2the-1F) also can better exert the wear-resistant modification capability, thereby realizing the excellent surface characteristics of the obtained PMMA alloy.
The purpose of the invention is realized by the following technical scheme:
a chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material comprises the following raw materials in parts by weight:
the nanometer functional master batch is a monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer nanometer functional master batch obtained by a monolayer re-stacking method.
In the PMMA/UHMWPE alloy material:
the PMMA resin is polymethyl methacrylate, and the melt index MFR of the PMMA resin is 2-10g/10min under the test conditions of 220 ℃ and 10 kg.
The UHMWPE resin is ultrahigh molecular weight polyethylene powder, the molecular weight is more than 150 ten thousand, the particle mesh number is 60-150 meshes, and the particle size is 100-300 mu m.
The external lubricant is one or more of polyolefin wax, polyamide wax, erucamide, pentaerythritol stearate PETS, polytetrafluoroethylene and other organic external lubricants.
The antioxidant is a complex ligand of one or more of organic auxiliary agents with specific structures, such as phosphite ester, hindered phenol, thioester compounds and the like, which can capture free radicals generated by the thermal degradation of polymers.
The preparation method of the nanometer functional master batch comprises the following steps: weighing 3-10 parts of nano molybdenum dioxide particles MoS2Under the protection of nitrogen, MoS is added2The microparticles were immersed in 200ml of 1mol.L-1And (2) performing magnetic stirring reaction on the n-cyclohexane solution of n-butyllithium for 24 hours, precipitating, washing and drying a reaction product, then putting the reaction product into an ethylene-methyl acrylate emulsion with the solid content of 30-45% under the action of ultrasonic dispersion, wherein the ultrasonic power is 52w, the ultrasonic time is 20min, and the frequency is 55Hz, so as to obtain a stable suspension of the monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer, stopping ultrasonic treatment, forming flocculation, filtering, washing and drying the suspension, so as to obtain the nano functional master batch.
The nano molybdenum disulfide is multi-piece layered inorganic powder, the appearance is gray black, the average particle size is 30-100nm, and the specific surface area is 80-170m2The effective content is more than or equal to 99.9 percent per gram.
The ethylene-methyl acrylate emulsion is a multi-monomer copolymer emulsion prepared by polymerizing vinyl acetate and methacrylate through seed emulsion, and the solid content is 30-45%.
The second purpose of the invention is to provide a chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material and a preparation method thereof, which is characterized in that the method comprises the following steps:
(1) weighing PMMA resin, UHMWPE resin, an external lubricant and an antioxidant according to the weight parts, and uniformly mixing to obtain a mixed raw material:
(2) placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
The invention has the following beneficial effects:
1. firstly, an efficient and directional magnetic stirring reaction method is adopted, and the reaction is based on small size (the mesh number is less than or equal to 100) and large plane (the surface area is more than or equal to 80 m)2Multiple layers of molybdenum disulfide powder material/g), molybdenum disulfide (MoS) with single-layer structure is accurately prepared2-1F) sheet body, then macromolecule chain of ethylene-methyl acrylate copolymer is diffused and inserted between the sheet layers by means of high-frequency ultrasonic dispersion, so as to obtain molybdenum disulfide functional master batch with dispersion size reaching nanometer level, and compared with wear-resistant auxiliary agents with single function, such as inorganic fibers (carbon fibers and glass fibers), inorganic powder (such as calcium carbonate, talcum powder and wollastonite) and high-rigidity Polymer (POM) used in the conventional method, the block copolymer contained in the master batch has the function of promoting compatibility and dispersibility of UHMWPE in PMMA matrix; on the other hand, the inorganic structure molybdenum disulfide nano layer can better exert the modification and improvement of the lamellar structure on the surface wear resistance of PMMA.
2. The PMMA/UHMWPE alloy material obtained by the technical scheme of the invention has excellent mechanical property, extremely excellent chemical resistance and obvious surface wear resistance and self-lubricating property. Tests show that the rigidity and the impact resistance of the modified PMMA/UHMWPE alloy material are kept similar to or slightly improved before modification, and due to the good dispersion distribution effect of UHMWPE, the surface cracking resistance time of the PMMA alloy material in various chemical solvents (xylene, acetic acid, sodium bicarbonate solution and detergent) is greatly delayed from 15-30min on average to more than 60min, and particularly in a detergent-resistant test with use value, the surface cracking resistance time can reach more than 100 min. Further wear resistance tests show that the surface friction coefficient (for steel) of the modified PMMA/UHMWPE alloy material is reduced to about 0.15 from 0.4-0.5, the surface self-lubricating property is obviously improved, and the numerical value of the wear-resistant quality of the surface is also reduced to about 1/4-1/5 before modification.
Detailed Description
The invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
The raw materials used in the embodiment of the invention are as follows:
PMMA-1: polymethyl methacrylate HT20Y, melt index MFR of 6g/10min at 220 ℃ under 10kg test conditions, Sumitomo chemical Co., Japan.
PMMA-2: the polymethyl methacrylate CM-205 has a melt index MFR of 2.5g/10min at 220 ℃ under a test condition of 10kg, Zhenjiangqimei.
UHMWPE-1: ultra-high molecular weight polyethylene GK02, white powder, 80-100 meshes, particle size of 150-200um, molecular weight of 200-300 ten thousand, China petrochemical Yanshan company.
UHMWPE-2: the polyethylene with the ultra-high molecular weight is 9300GK, white powder with the mesh number of 80-100 meshes, the particle size of 150-200 mu m, the molecular weight of 450 ten thousand and the Yanshan company of China petrochemical industry.
External lubricant: polytetrafluoroethylene PTFE LUBRON L-5, white micro-powder resin, Japan Dajin chemical, with average particle size of 5um and water content less than or equal to 0.03%.
Nano molybdenum disulfide: MH-MoS2Lamellar gray black powder with average particle diameter of 40nm and specific surface area of 120m2The purity is more than or equal to 99.9 percent per gram.
Ethylene-methyl acrylate emulsion: the solid suspension is prepared by polymerizing ethylene monomer and methyl acrylate monomer based on anionic emulsion, and the solid content of the solid suspension is controlled to be 30-45%.
Antioxidant: inox 354 phosphite ester/hindered phenol are compounded into a high-temperature-resistant and yellowing-resistant antioxidant according to the proportion of 2:1, the melting point is more than or equal to 205 ℃, and Shanghai Enlossa chemical technology Co.
And (3) product performance testing:
and (3) testing the bending property: according to the sample strip size specified by ISO178 standard, the test is carried out after the standard sample strip is injected, the test is carried out on a universal tensile testing machine, the test speed is 2mm/min, and the test is carried out in the environment of normal temperature (23 ℃).
Normal temperature impact property: according to the sample strip size specified by ISO179-1 standard, the test is carried out after the injection molding of a standard sample strip on a simple beam impact tester with a notch type of A in a normal temperature (23 ℃) environment.
Chemical resistance test A test piece of 100 × 10 × 3.2.2 mm size was prepared, immersed in acetic acid, xylene, 10% sodium carbonate solution under standard conditions (23 ℃, 50% RH), and a certain amount of car detergent was applied to the surface of the piece, the cracking of the material surface was observed, and the cracking time was recorded.
Surface wear resistance test is carried out according to the standard method shown in GB 3960-83, the test is carried out on a sliding friction wear testing machine controlled by an M-200 microcomputer, the test size is 30 × 7 × 6mm, the load is 20kg, the rotating speed is 200 r/min, the stroke is 3016M, room temperature, atmosphere and dry friction are carried out, a mating part is a 45# steel ring with the diameter of 40mm, and the surface friction coefficient and the wear quality (to steel) of the material are obtained after the test.
The preparation method of the nano functional master batch in the embodiment comprises the following steps: weighing 3-10 parts of nano molybdenum dioxide particles MoS2Under the protection of nitrogen, MoS is added2The microparticles were immersed in 200ml of 1mol.L-1And (2) performing magnetic stirring reaction on the n-cyclohexane solution of n-butyllithium for 24 hours, precipitating, washing and drying a reaction product, then putting the reaction product into an ethylene-methyl acrylate emulsion with the solid content of 30-45% under the action of ultrasonic dispersion, wherein the ultrasonic power is 52w, the ultrasonic time is 20min, and the frequency is 55Hz, so as to obtain a stable suspension of the monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer, stopping ultrasonic treatment, forming flocculation, filtering, washing and drying the suspension, so as to obtain the nano functional master batch.
Example 1
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of the example 1 shown in the table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
Example 2
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of the example 2 shown in the table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
TABLE 1 formulation of chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy materials (unit: gram)
Example 3
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of the example 3 shown in the table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
Example 4
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of example 4 shown in Table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
Example 5
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of example 5 shown in Table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
Example 1
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of example 6 shown in Table 1, and uniformly mixing to obtain a mixed raw material:
placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
Comparative example 1
Weighing PMMA resin, UHMWPE resin, external lubricant and antioxidant according to the data of comparative example 1 shown in Table 1, and uniformly mixing to obtain a mixed raw material:
the dried mixed raw materials are placed in a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and are added into a machine barrel of the extruder through a feeding screw. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃ and the rotation speed of a main engine is 200 r/min, and the PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying treatment and the like.
Comparative example 2
15% mineral filled PMMA composite DRT MATT 101, available from arkema, france.
TABLE 2 test results of chemical solvent resistance, high wear resistance, self-lubricating PMMA/UHMWPE alloy material
Comparing the material test data of each example and comparative example in table 2, it can be seen that, although the friction coefficient and the abrasion loss are reduced to some extent by the improvement of the surface hardness of the material in the conventional inorganic mineral filling modification method (comparative example 2), the material is very brittle and the solvent resistance is not ideal, which corresponds to that in comparative example 1, the modification effect is not fully exerted due to the lack of good compatibility and dispersibility by the adoption of the highly wear-resistant and solvent-resistant UHMWPE material component. And the addition of the molybdenum disulfide nanometer functional master batch with a special structure in the embodiments 1-6 benefits from, the mechanical property, the solvent resistance and the surface wear resistance of the material are further improved to different degrees, and the comparative analysis of the test data shows that the modification amplitude mainly depends on 2 factors: molecular weight of UHMWPE, melt index of PMMA material. In examples 2 and 5, the molecular weight of the UHMWPE is up to 450 ten thousand, which has negative influence on the melt processing dispersion, while in comparative examples 4 and 6, the same amount of low molecular weight UHMWPE powder is easier to melt disperse, thereby providing good prerequisites for improving the solvent resistance and wear resistance of PMMA alloy materials. In example 6, the amount of the key component, namely the molybdenum sulfide nano-functional master batch, is optimized, so that the PMMA/UHMWPE alloy material has the optimal performance, the rigidity indexes (bending strength and bending modulus) of the PMMA/UHMWPE alloy material are slightly lower than those of comparative example 2, the notch impact toughness comparison is improved by 2-3 times, the solvent cracking resistance time is greatly prolonged to about 60min, and the solvent cracking resistance time of comparative example 2 is only 15-20 min. For more important wear-resisting property performance, the surface friction coefficient (for steel) in example 6 is reduced to about 0.10 from 0.39, a good self-lubricating effect is achieved, and the surface wear quality is also reduced to 1/3-1/4 in comparative example 2.
The modification scheme of the PMMA alloy material described by the invention provides a more balanced solution for solving inherent performance defects of easy scratching of the surface, solvent intolerance and the like, but does not simply improve the surface hardness of PMMA and sacrifice other performance indexes such as notch toughness and solvent resistance, and the modification scheme for synergistically improving the surface hardness, the mechanical property and the solvent resistance has good application prospects in the fields of special parts with high appearance requirements, aesthetic designs and high chemical stability requirements, such as automobile external spray decorative parts, spray-free high-gloss shells of household appliances and the like.
Claims (9)
1. A PMMA/UHMWPE alloy material with chemical solvent resistance, high wear resistance and self-lubrication is characterized in that: the feed comprises the following raw materials in parts by weight:
the nanometer functional master batch is a monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer nanometer functional master batch obtained by a monolayer re-stacking method.
2. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 1, characterized in that: the PMMA resin is polymethyl methacrylate, and the melt index MFR of the PMMA resin is 2-10g/10min under the test conditions of 220 ℃ and 10 kg.
3. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 1, characterized in that: the UHMWPE resin is ultrahigh molecular weight polyethylene powder, the molecular weight is more than 150 ten thousand, the particle mesh number is 60-150 meshes, and the particle size is 100-300 mu m.
4. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 1, characterized in that: the external lubricant is one or more of polyolefin wax, polyamide wax, erucamide, pentaerythritol stearate PETS, polytetrafluoroethylene and other organic external lubricants.
5. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 1, characterized in that: the antioxidant is a complex ligand of one or more of organic auxiliary agents with specific structures, such as phosphite ester, hindered phenol, thioester compounds and the like, which can capture free radicals generated by the thermal degradation of polymers.
6. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 1, characterized in that: the preparation method of the nanometer functional master batch comprises the following steps: weighing 3-10 parts of nano molybdenum dioxide particles MoS2Under the protection of nitrogen, MoS is added2The microparticles were immersed in 200ml of 1mol.L-1And (2) performing magnetic stirring reaction on the n-cyclohexane solution of n-butyllithium for 24 hours, precipitating, washing and drying a reaction product, then putting the reaction product into an ethylene-methyl acrylate emulsion with the solid content of 30-45% under the action of ultrasonic dispersion, wherein the ultrasonic power is 52w, the ultrasonic time is 20min, and the frequency is 55Hz, so as to obtain a stable suspension of the monolayer molybdenum disulfide intercalation composite ethylene-methyl acrylate copolymer, stopping ultrasonic treatment, forming flocculation, filtering, washing and drying the suspension, so as to obtain the nano functional master batch.
7. A chemical solvent resistant, high wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 6, characterized in that: the nano molybdenum disulfide is multi-piece layered inorganic powder, the appearance is gray black, the average particle size is 30-100nm, and the specific surface area is 80-170m2The effective content is more than or equal to 99.9 percent per gram.
8. A chemical solvent resistant, high wear resistant, self lubricating PMMA/UHMWPE alloy material according to claim 6, characterized in that: the ethylene-methyl acrylate emulsion is a multi-monomer copolymer emulsion prepared by polymerizing vinyl acetate and methacrylate through seed emulsion, and the solid content is 30-45%.
9. A chemical solvent resistant, highly wear resistant, self lubricating PMMA/UHMWPE alloy material according to any of the claims 1-8 and a process for its preparation, characterized in that said process comprises the steps of:
(1) weighing PMMA resin, UHMWPE resin, an external lubricant and an antioxidant according to the weight parts, and uniformly mixing to obtain a mixed raw material:
(2) placing the dried mixed raw materials into a main feeding bin of a double-screw extruder which is tightly meshed and rotates in the same direction, and adding the dried mixed raw materials into a machine barrel of the extruder through a feeding screw; weighing a certain amount of nano functional master batch according to a proportion, and adding the nano functional master batch into a machine barrel of an extruder through a lateral feeding screw rod. The diameter of the screw extruder used was 42mm, the length-diameter ratio L/D was 50, and the temperatures of the respective zones from the feed port to the head outlet of the main barrel were set as follows: 180 ℃, 210 ℃, 220 ℃, 235 ℃, 230 ℃ and 220 ℃, and the rotation speed of a main engine is 200 r/min, and the chemical solvent resistant, high wear resistant and self-lubricating PMMA/UHMWPE alloy material is obtained after the processes of melt extrusion, granulation, drying and the like.
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