CN115536928A

CN115536928A - Composite material for bridge support sliding wear-resisting plate and preparation method thereof

Info

Publication number: CN115536928A
Application number: CN202211261287.4A
Authority: CN
Inventors: 杜楠; 杨磊; 周育驰; 刘浪涛; 张静
Original assignee: Shaanxi Communications Holding Group Co ltd
Current assignee: Shaanxi Communications Holding Group Co ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2022-12-30
Anticipated expiration: 2042-10-14
Also published as: CN115536928B

Abstract

The invention discloses a composite material for a bridge bearing sliding wear-resisting plate and a preparation method thereof, wherein the composite material comprises the following components in parts by mass: 5 to 20 parts of lubricating and wear-resisting agent, 1 to 10 parts of inorganic filler, 0.1 to 2 parts of silane coupling agent, 1 to 10 parts of fiber and 60 to 90 parts of ultra-high molecular weight polyethylene; the lubricating and wear-resisting agent is modified molybdenum disulfide, and the composite material disclosed by the invention is good in self-lubricating property, strong in wear resistance, high in mechanical strength and strong in bearing capacity, and can completely meet various performance requirements required by a bridge support.

Description

Composite material for bridge support sliding wear-resisting plate and preparation method thereof

Technical Field

The invention relates to the technical field of composite materials for bridge bearings, in particular to a composite material for a sliding wear-resisting plate of a bridge bearing and a preparation method thereof.

Background

The bridge is used as a necessary component of a railway, a highway and the like, and particularly in a high-speed railway, the proportion of the bridge is larger and larger. The bridge support is an important structural component for connecting an upper structure and a lower structure of a bridge, is positioned between the bridge and the cushion stone, can reliably transfer load and deformation borne by the upper structure of the bridge to the lower structure of the bridge, and continuously increases the load capacity of a railway train along with the development of a high-speed railway, so that the performance requirement on the bridge support is continuously improved.

At present, most bridge bearing production enterprises adopt pure Polytetrafluoroethylene (PTFE), the PTFE has large creep property and low bearing capacity under the action of long-term load, so that the requirements of high speed and heavy load of railways are difficult to meet, and ultrahigh molecular weight polyethylene (UHMWPE) is used as a substitute material of the PTFE due to the advantages of impact resistance, low temperature resistance, self lubrication, difficulty in adhering foreign matters and the like, but the defects of poor wear resistance, low mechanical strength and the like of the UHMWPE limit the application of the UHMWPE.

Therefore, a composite material for bridge supports with high mechanical strength and strong abrasion resistance is urgently needed.

Disclosure of Invention

In order to solve the technical problems, the invention provides a composite material for a bridge support sliding wear-resisting plate and a preparation method thereof.

The technical scheme of the invention is as follows: a composite material for a bridge bearing sliding wear-resisting plate comprises the following components in parts by weight: 5-20 parts of lubricating wear-resistant agent, 1-10 parts of inorganic filler, 0.1-2 parts of silane coupling agent, 1-10 parts of fiber and 60-90 parts of ultrahigh molecular weight polyethylene; the lubricating and wear-resisting agent is modified molybdenum disulfide, the composite material of the components has good self-lubricating property, strong wear resistance, high mechanical strength and strong bearing capacity, the modified molybdenum disulfide powder has good compatibility with an ultrahigh molecular weight polyethylene matrix, the wear resistance of the matrix is improved, and the obtained composite material can completely meet various performance requirements required by a bridge support.

Further, the preparation method of the modified molybdenum disulfide comprises the following steps:

1) Putting molybdenum disulfide powder into a reaction vessel, and adding a treating agent into the reaction vessel to obtain a mixture; the treating agent comprises the following components in parts by mass: 1-3 parts of chloroacetic acid and 6-8 parts of sodium hydroxide solution, wherein the mass concentration of the sodium hydroxide solution is 30%;

2) Placing the reaction vessel at 4-10 ℃ and preserving heat for 30-60 min, and adding a modifier into the mixture within the preservation time, wherein the total addition of the modifier accounts for 2-8% of the total mass of the molybdenum disulfide powder, and the modifier comprises the following components in parts by mass: 2-4 parts of ethylenediamine and 1-3 parts of hexadecyl trimethyl ammonium bromide;

equally dividing the total addition amount of the modifier into 5-10 parts, adding one part into the mixture every 1-3 min, applying an electric field to the mixture while preserving heat, wherein the voltage is gradually attenuated along with the addition of the modifier, and the current of the electric field is 2-4A, and the voltage is 70-90V;

wherein, after adding every part of modifier, the voltage is attenuated by 1-5V, then the mixture in the reaction vessel is heated to 80-100 ℃, 2-ethyl hexanoic acid is added into the reaction vessel and is kept for 15-20 min under the condition of continuous stirring, and the addition amount of the 2-ethyl hexanoic acid accounts for 1-6% of the total mass of the molybdenum disulfide powder;

3) And standing for 2-4 h after the heat preservation is finished, and then filtering and drying the molybdenum disulfide to obtain the modified molybdenum disulfide.

According to the modified molybdenum disulfide prepared by the method, the molybdenum disulfide powder is modified under the action of an electric field and a modifier, the compatibility of the molybdenum disulfide powder and an ultrahigh molecular weight polyethylene matrix is improved by 2-ethylhexanoic acid, the ductility of the ultrahigh molecular weight polyethylene is prevented from being damaged by the molybdenum disulfide, the self-lubricating property of the composite material is improved by the modified molybdenum disulfide, and the delamination and peeling caused by abrasion of the molybdenum disulfide are reduced by the modification treatment of the modifier.

Furthermore, the granularity of the molybdenum disulfide powder is 200-400 meshes, and the molybdenum disulfide powder with the specified mesh number can avoid the phenomenon that the performance of the composite material is influenced because gaps appear at the joint of molybdenum disulfide and a matrix due to the overlarge granularity of the molybdenum disulfide powder.

Furthermore, the inorganic filler is one or more of wollastonite, magnesium hydroxide and calcium sulfate which are mixed in any ratio, and the addition of the inorganic filler is favorable for improving the mechanical strength of the wear-resisting plate, improving the hardness of the composite material and reducing wear.

Furthermore, the silane coupling agent is vinyltrimethoxysilane or vinyltriethoxysilane, and the coupling agent can improve the compatibility of the inorganic filler and the ultrahigh molecular weight polyethylene and avoid stress concentration caused by the addition of the inorganic filler.

Furthermore, the fibers are glass fibers or carbon fibers, and the fibers can further reinforce the mechanical strength of the composite material and improve the bearing capacity of the composite material.

Further, the preparation method of the composite material comprises the following steps:

1) Weighing the lubricating wear-resisting agent, the inorganic filler, the fiber, the silane coupling agent and the ultra-high molecular weight polyethylene according to the mass percentage as raw materials;

2) Putting the raw materials into a mixer to be mixed for 20-30 min, gradually adding a reinforcing agent in the mixing process, gradually reducing the addition of the reinforcing agent from 40-60 ml/min of the initial amount along with the stirring time at the speed of 4-6 ml/min to obtain a mixture after the mixing is finished, and drying the mixture at 120-180 ℃ for 5-10 min;

3) And after drying, putting the mixture into a mold, performing compression molding by using a press vulcanizer, and naturally cooling to obtain the sliding wear-resisting plate after compression molding.

The composite material prepared by the preparation method has no defects of bubbles, impurities and the like in the compression molding process, avoids the stress concentration in the ultrahigh molecular weight polyethylene matrix, and the reinforcing material can be uniformly distributed in the matrix, so that the prepared composite material has the advantages of good lubricity, strong abrasion resistance, high mechanical strength and the like, and the reinforcing agent further improves the bonding property between other raw materials and the ultrahigh molecular weight polyethylene matrix and improves the tensile strength of the composite material.

Further, the components of the reinforcing agent comprise the following components in percentage by mass: the reinforcing agent comprises the following components in parts by weight: 25 to 40 parts of methyl phenylacetate, 30 to 45 parts of phenoxyethanol, 5 to 15 parts of dimethyl phosphite and 20 to 35 parts of acetone, wherein the reinforcing agent can strengthen the binding property between other raw materials and the ultra-high molecular weight polyethylene, so that the lubricating wear-resistant agent and the inorganic filler can be dispersed in the matrix and tightly bound with the matrix, and the tensile strength of the composite material is improved.

The invention has the beneficial effects that:

(1) The composite material disclosed by the invention has the advantages of good self-lubricating property, strong abrasion resistance, high mechanical strength and strong bearing capacity, the added modified molybdenum disulfide has good compatibility with the ultra-high molecular weight polyethylene, the ductility reduction of the ultra-high molecular weight polyethylene caused by the addition of the molybdenum disulfide is avoided, the self-lubricating property of the composite material is improved by the modified molybdenum disulfide, and the delamination and peeling caused by abrasion of the modified molybdenum disulfide can be avoided.

(2) The composite material of the invention has no defects of bubbles, inclusion and the like in the compression molding process, avoids the stress concentration in the ultrahigh molecular weight polyethylene matrix, uniformly distributes the reinforcing material in the matrix, and can further improve the associativity between other raw materials and the ultrahigh molecular weight polyethylene matrix and improve the tensile strength of the composite material.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments thereof for better understanding the advantages of the invention.

Example 1

A composite material for a bridge bearing sliding wear-resisting plate comprises the following components in parts by weight: 15 parts of lubricating and wear-resisting agent, 5 parts of inorganic filler, 1 part of silane coupling agent, 5 parts of fiber and 80 parts of ultrahigh molecular weight polyethylene; the lubricating and wear-resisting agent is modified molybdenum disulfide; the inorganic filler is wollastonite; the silane coupling agent is vinyl triethoxysilane; the fibers are glass fibers;

the preparation method of the modified molybdenum disulfide comprises the following steps:

1) Putting molybdenum disulfide powder into a reaction vessel, and adding a treating agent into the reaction vessel to obtain a mixture; the treating agent comprises the following components in parts by weight: 2 parts of chloroacetic acid and 7 parts of sodium hydroxide solution, wherein the mass concentration of the sodium hydroxide solution is 30%; the granularity of the molybdenum disulfide powder is 300 meshes;

2) And (2) placing the reaction vessel at 8 ℃ and keeping the temperature for 45min, and adding a modifier into the mixture within the keeping time, wherein the total addition of the modifier accounts for 5% of the total mass of the molybdenum disulfide powder, and the modifier comprises the following components in parts by mass: 3 parts of ethylenediamine and 2 parts of hexadecyl trimethyl ammonium bromide;

equally dividing the total addition amount of the modifier into 8 parts, adding one part into the mixture every 2min, applying an electric field to the mixture while preserving heat, wherein the voltage is gradually attenuated along with the addition of the modifier, and the current of the electric field is 3A and the voltage is 80V;

wherein, after each part of modifier is added, the voltage is attenuated by 4V, then the mixture in the reaction vessel is heated to 90 ℃, 2-ethyl hexanoic acid is added into the reaction vessel and is kept for 18min under the condition of continuous stirring, and the addition amount of the 2-ethyl hexanoic acid accounts for 3% of the total mass of the molybdenum disulfide powder;

3) After heat preservation is finished, standing for 3 hours, and then filtering and drying the molybdenum disulfide to obtain modified molybdenum disulfide;

the preparation method of the composite material comprises the following steps:

1) Weighing modified molybdenum disulfide, wollastonite, glass fiber, vinyl triethoxysilane and ultrahigh molecular weight polyethylene as raw materials in percentage by mass;

2) Putting the raw materials into a mixer to mix for 25min, gradually adding a reinforcing agent in the mixing process, gradually reducing the addition of the reinforcing agent from 50ml/min of initial amount along with the stirring time at the speed of 5ml/min to obtain a mixture after mixing is finished, and drying the mixture at 160 ℃ for 8min;

3) After drying, putting the mixture into a mold, performing compression molding by using a press vulcanizer, and naturally cooling to obtain the sliding wear-resisting plate after compression molding;

the reinforcing agent comprises the following components in percentage by mass: 33 parts of methyl phenylacetate, 25 parts of phenoxyethanol, 12 parts of dimethyl phosphite and 30 parts of acetone.

Example 2

The present example is substantially the same as example 1, except that the composite material comprises the following components in parts by mass: 5 parts of lubricating and wear-resisting agent, 1 part of inorganic filler, 0.1 part of silane coupling agent, 1 part of fiber and 60 parts of ultrahigh molecular weight polyethylene.

Example 3

The present example is substantially the same as example 1, except that the composite material comprises the following components in parts by mass: 20 parts of lubricating and wear-resisting agent, 10 parts of inorganic filler, 2 parts of silane coupling agent, 10 parts of fiber and 90 parts of ultrahigh molecular weight polyethylene.

Example 4

This example is essentially the same as example 1 except that the molybdenum disulfide powder has a particle size of 200 mesh.

Example 5

This example is essentially the same as example 1 except that the molybdenum disulfide powder has a particle size of 400 mesh.

Example 6

The treating agent comprises the following components in parts by weight: 1 part of chloroacetic acid and 6 parts of sodium hydroxide solution.

Example 7

The treating agent comprises the following components in parts by mass: 3 parts of chloroacetic acid and 8 parts of sodium hydroxide solution.

Example 8

This example is essentially the same as example 1, except that the reaction vessel is held at 4 ℃ for 30min and the modifier is added to the mixture over the hold time.

Example 9

This example is essentially the same as example 1 except that the reaction vessel is held at 10 ℃ for 60min and the modifier is added to the mixture over the holding time.

Example 10

This example is substantially the same as example 1, except that the modifier comprises the following components in parts by mass: 2 parts of ethylenediamine and 1 part of hexadecyl trimethyl ammonium bromide;

example 11

This example is substantially the same as example 1, except that the modifier comprises, in parts by mass: 4 parts of ethylenediamine and 3 parts of hexadecyl trimethyl ammonium bromide;

example 12

The embodiment is basically the same as the embodiment 1, except that the total adding amount of the modifier accounts for 2 percent of the total mass of the molybdenum disulfide powder, and the total adding amount of the modifier is equally divided into 5 parts.

Example 13

This example is substantially the same as example 1 except that the total amount of the modifier added was 8% by mass of the total mass of the molybdenum disulfide powder, and the total amount of the modifier added was equally divided into 10 parts.

Example 14

This example is substantially the same as example 1 except that the electric field has a current of 2A and a voltage of 70V and the voltage gradually decays with the addition of modifier, with the voltage decaying by 1V after each addition of one modifier addition to the mixture every 1 min.

Example 15

This example is essentially the same as example 1 except that the electric field has a current of 4A and a voltage of 90V and the voltage decays gradually as modifier is added, with one modifier being added to the mixture every 3min and the voltage decaying by 5V after each addition.

Example 16

The embodiment is basically the same as the embodiment 1, except that the mixture in the reaction vessel is heated to 80 ℃, 2-ethylhexanoic acid is added into the reaction vessel and kept for 15min under the condition of continuous stirring, the addition amount of the 2-ethylhexanoic acid accounts for 1% of the total mass of the molybdenum disulfide powder, after the heat preservation is finished, the mixture is kept still for 2h, and then the molybdenum disulfide is filtered and dried to obtain the modified molybdenum disulfide.

Example 17

The method is basically the same as that in example 1, except that the mixture in the reaction vessel is heated to 100 ℃, 2-ethylhexanoic acid is added into the reaction vessel and kept warm for 20min under a continuous stirring state, the addition amount of the 2-ethylhexanoic acid accounts for 6% of the total mass of the molybdenum disulfide powder, after the heat preservation is completed, the mixture is kept stand for 4h, and then the molybdenum disulfide is filtered and dried to obtain the modified molybdenum disulfide.

Example 18

This example is substantially the same as example 1, except that in step 2) of the method for preparing a composite material, the raw materials were mixed in a mixer for 20min to obtain a mixed material, and the mixed material was dried at 120 ℃ for 5min.

Example 19

This example is substantially the same as example 1, except that in step 2) of the method for preparing a composite material, the raw materials were mixed in a mixer for 30min to obtain a mixed material, and the mixed material was dried at 180 ℃ for 10min.

Example 20

This example is substantially the same as example 1 except that the amount of the reinforcing agent added is gradually decreased from the initial amount of 40ml/min at a rate of 4ml/min with the stirring time.

Example 21

This example is substantially the same as example 1 except that the amount of the reinforcing agent added is gradually decreased from an initial amount of 60ml/min at a rate of 6ml/min with the stirring time.

Example 22

This example is substantially the same as example 1, except that the ingredients of the enhancer include, in parts by mass: 25 parts of methyl phenylacetate, 30 parts of phenoxyethanol, 5 parts of dimethyl phosphite and 20 parts of acetone.

Example 23

This example is substantially the same as example 1, except that the ingredients of the enhancer include, in parts by mass: 40 parts of methyl phenylacetate, 45 parts of phenoxyethanol, 15 parts of dimethyl phosphite and 35 parts of acetone.

Examples of the experiments

The mechanical properties of the composite materials obtained in the examples are studied, and the following are studied specifically:

1. the influence of the composition of the composite on the properties was explored:

using examples 1, 2, 3 as experimental comparisons and unmodified molybdenum disulfide as comparative example 1, composite property data are obtained as shown in Table 1:

TABLE 1 composite Property data for different compositions

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 2	42.2	0.043	2.06
				Example 3	42.9	0.037	1.75
Comparative example 1	35.1	0.051	3.26

As is clear from the data in Table 1, the composite materials obtained from the components of example 1 have higher tensile strength, lower friction coefficient, lower linear wear rate and better overall performance than those of examples 1, 2 and 3; compared with the comparative example 1, the tensile strength of the composite material is improved and the abrasion rate is obviously reduced after the modified molybdenum disulfide is used in the example 1.

2. The influence of molybdenum disulfide powder with different particle sizes on the performance of the composite material is explored:

the composite properties obtained using examples 1, 4 and 5 as experimental comparisons are shown in table 2:

TABLE 2 composite Performance data obtained for molybdenum disulfide powders of different particle sizes

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 4	44.7	0.039	1.55
				Example 5	45.6	0.031	1.20

As can be seen from the data in table 2, the composite material obtained by using 300 mesh molybdenum disulfide powder in example 1 has better combination properties than that obtained in example 4, and the composite material obtained by using 300 mesh molybdenum disulfide powder in example 1 has less difference in properties than that obtained in example 5, so that the cost is lower in terms of production by using 300 mesh molybdenum disulfide powder.

3. The influence of the composition of the treating agent on the performance of the composite material is explored:

the composite property data obtained using examples 1, 6, 7 as experimental comparisons are shown in table 3:

TABLE 3 composite Property data obtained for different treatment compositions

Group of	Tensile strength (Mpa)	Coefficient of friction	Wire abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 6	45.0	0.044	1.59
				Example 7	44.8	0.047	1.62

As is clear from the data in Table 3, the composite material obtained in example 1 has the best overall properties, and the treating agent component ratio in example 1 is the best.

4. The influence of the heat preservation temperature and time of the reaction vessel on the performance of the composite material is explored:

the composite property data obtained using examples 1, 8, 9 as experimental comparisons are shown in table 4:

TABLE 4 composite Performance data obtained for different holding temperatures and times of the reaction vessel

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 8	43.4	0.048	1.79
				Example 9	44.1	0.042	1.74

As can be seen from the data in Table 4, the composite material obtained in example 1 has the best overall properties, and the reaction vessel of example 1 has the best insulation temperature and time.

5. The influence of the components of the modifier on the performance of the composite material is researched:

using examples 1, 10, 11 as experimental comparisons and example 1 as a reference, only cetyltrimethylammonium bromide as comparative example 2 was used in the modifier, resulting in composite property data as shown in Table 5:

TABLE 5 composite Property data obtained for different compositions of modifier

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 10	42.8	0.041	1.87
				Example 11	44.9	0.048	1.56
Comparative example 2	41.5	0.058	2.26

As can be seen from the data in Table 5, the composite materials obtained in examples 1 are the best in overall performance and the modifier in example 1 is the best in the component ratio as compared with examples 1, 10 and 11; example 1 compared to comparative example 2, the composite material obtained with the modifier using only cetyltrimethylammonium bromide showed significantly lower performance, so that ethylenediamine and cetyltrimethylammonium bromide acted together in the modifier.

6. The influence of the addition part of the modifier on the performance of the composite material is researched:

using examples 1, 12, 13 as experimental comparisons and example 1 as a reference, all modifiers were added at once as comparative example 3, and the resulting composite property data are shown in Table 6:

TABLE 6 composite Performance data obtained for different addition fractions of modifier

As can be seen from the data in Table 6, the composite materials obtained in examples 1 are the best in overall performance and the modifier is added in the best proportion in example 1, as compared with examples 1, 12 and 13; compared with the comparative example 3, the composite material obtained by the modifier adding mode in the example 1 has better comprehensive performance.

7. The influence of electric field parameters on the performance of the composite material is researched:

the performance data of the composite material obtained by using examples 1, 14 and 15 as experimental comparisons and using comparative example 1 as a reference and molybdenum disulfide modification without voltage decay as comparative example 4 are shown in table 7:

TABLE 7 composite Performance data obtained with different electric field parameters

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 14	43.6	0.050	1.94
				Example 15	44.2	0.049	1.89
Comparative example 4	41.8	0.058	2.21

As can be seen from the data in Table 7, the composite materials obtained in examples 1 are the best in overall performance and the best in electric field parameters in example 1, compared with examples 1, 14 and 15; compared with the comparative example 4, the composite material obtained by the decay of the electric field of the example 1 along with the heat preservation time has better comprehensive performance.

8. The influence of the mixture heat preservation and standing time on the performance of the composite material is researched:

the composite property data obtained using examples 1, 16, 17 as experimental comparisons are shown in table 8:

TABLE 8 composite Performance data for incubation and standing time of the mixture

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 16	44.8	0.038	1.49
				Example 17	45.7	0.034	1.20

As can be seen from the data in Table 8, the composite material obtained in example 1 has better comprehensive properties and the heat preservation time and the standing time of example 1 are better than those of example 16; the data of example 1 is not much different from that of example 17, and example 1 is more preferable from the viewpoint of time cost.

9. The influence of the mixing time on the performance of the composite material is explored:

the composite property data obtained using examples 1, 18, 19 as experimental comparisons are shown in table 9:

TABLE 9 composite Performance data obtained at different compounding times

Group of	Tensile strength (Mpa)	Coefficient of friction	Line abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 18	44.2	0.044	1.87
				Example 19	45.6	0.035	1.21

As can be seen from the data in Table 9, the composite material obtained in example 1 has better comprehensive properties and the mixing time of example 1 is better than that of example 18 in example 1; the data of example 1 is not much different from that of example 19, and example 1 is more preferable from the viewpoint of time cost.

10. The influence of the addition amount of the reinforcing agent on the performance of the composite material is researched:

the composite material property data obtained using examples 1, 20, 21 as experimental comparisons and example 1 as reference and the reinforcing agent added all at once as comparative example 5 are shown in table 10:

TABLE 10 composite Performance data obtained with different reinforcing agent additions

Group of	Tensile strength (Mpa)	Coefficient of friction	Wire abrasion Rate (μm/km)
				Example 1	45.5	0.035	1.24
Example 20	44.1	0.046	1.88
				Example 21	44.5	0.042	1.71
Comparative example 5	42.3	0.054	2.36

As is clear from the data in Table 10, the composite materials obtained in examples 1 are superior in overall performance and the reinforcing agent added in example 1 is superior to those obtained in examples 1, 20 and 21; example 1 the reinforcing agent addition of example 1 resulted in a composite with better properties than comparative example 5.

11. The influence of the reinforcing agent component on the performance of the composite material is researched:

the composite property data obtained with examples 1, 22, 23 as experimental comparisons and example 1 as reference and no reinforcing agent as comparative example 6 are shown in table 11:

TABLE 11 composite Performance data obtained for different enhancer ingredients

As is clear from the data in Table 11, the reinforcing agent component in example 1 gives the best overall performance of the composite materials in examples 1, 22 and 23, and the reinforcing agent component in example 1 improves the overall performance of the composite materials in comparative example 6.

Claims

1. The composite material for the sliding wear-resisting plate of the bridge support is characterized by comprising the following components in parts by mass: 5-20 parts of lubricating wear-resistant agent, 1-10 parts of inorganic filler, 0.1-2 parts of silane coupling agent, 1-10 parts of fiber and 60-90 parts of ultrahigh molecular weight polyethylene; the lubricating and wear-resisting agent is modified molybdenum disulfide.

2. The composite material for the sliding wear plate of the bridge bearing according to claim 1, wherein the preparation method of the modified molybdenum disulfide comprises the following steps:

1) Putting molybdenum disulfide powder into a reaction vessel, and adding a treating agent into the reaction vessel to obtain a mixture; the treating agent comprises the following components in parts by weight: 1-3 parts of chloroacetic acid and 6-8 parts of sodium hydroxide solution, wherein the mass concentration of the sodium hydroxide solution is 30%;

wherein, after each part of modifier is added, the voltage is attenuated by 1-5V, then the mixture in the reaction vessel is heated to 80-100 ℃, 2-ethylhexanoic acid is added into the reaction vessel and is kept warm for 15-20 min under the state of continuous stirring, and the addition amount of the 2-ethylhexanoic acid accounts for 1-6% of the total mass of the molybdenum disulfide powder;

3. The composite material for the sliding wear plate of the bridge bearing seat is characterized in that the particle size of the molybdenum disulfide powder is 200-400 meshes.

4. The composite material for the sliding wear plate of the bridge bearing according to claim 1, wherein the inorganic filler is one or more of wollastonite, magnesium hydroxide and calcium sulfate mixed in any ratio.

5. The composite material for the sliding wear plate of bridge bearing seat according to claim 1, wherein the silane coupling agent is vinyltrimethoxysilane or vinyltriethoxysilane.

6. The composite material for the sliding wear plate of bridge bearing according to claim 1, wherein the fiber is glass fiber or carbon fiber.

7. A method for preparing a composite material according to any one of claims 1 to 6, wherein the method for preparing a composite material comprises:

1) Weighing the lubricating wear-resisting agent, the inorganic filler, the fiber, the silane coupling agent and the ultra-high molecular weight polyethylene as raw materials in percentage by mass;

2) Putting the raw materials into a mixer to mix for 20-30 min, gradually adding a reinforcing agent in the mixing process, gradually reducing the addition of the reinforcing agent from 40-60 ml/min of initial amount along with the stirring time at the speed of 4-6 ml/min to obtain a mixture after mixing, and drying the mixture at 120-180 ℃ for 5-10 min;

3) And after drying, putting the mixture into a die, performing compression molding by using a press vulcanizer, and naturally cooling to obtain the sliding wear-resisting plate after compression molding.

8. The preparation method of the composite material as claimed in claim 7, wherein the components of the reinforcing agent comprise, in parts by mass: 25 to 40 parts of methyl phenylacetate, 30 to 45 parts of phenoxyethanol, 5 to 15 parts of dimethyl phosphite and 20 to 35 parts of acetone.