CN113292766B - Combined coupling agent, modified carbonaceous aggregate, preparation method of modified carbonaceous aggregate and electric contact material - Google Patents

Abstract

The invention discloses a combined coupling agent for carbonaceous aggregate modification, comprising a borate coupling agent and a titanate coupling agent, the borate coupling agent and the titanate coupling agent The ratio of the agent is 1:(1-3). The present invention also provides a modified carbonaceous aggregate modified by the above-mentioned combined coupling agent and a preparation method of the above-mentioned modified carbonaceous aggregate. The present invention also provides an electrical contact material comprising the above modified carbonaceous aggregate. The invention proposes a new type of combined coupling agent, designs and prepares a modified carbonaceous aggregate and a resin-type sliding electrical contact material, expands the application range of the coupling agent, and is also a resin-type sliding electrical contact material The upgrading of the system provides a theoretical basis and a basis for applied research.

Description

Combined coupling agent, modified carbonaceous aggregate and its preparation method and electrical contact material

technical field

The invention belongs to the field of composite materials, and particularly relates to a coupling agent, a modified carbonaceous aggregate, a preparation method thereof, and an electrical contact material.

Background technique

Materials that are made of elements that are in contact with each other to conduct current (electrical signals, electrical energy) are called electrical contact materials. Electrical contact material is the functional carrier for electrical appliances to complete "on-conduct-off" current and signal generation and transmission. Its electrical contact performance is the key to affecting the reliability of electrical and electronic engineering. In the field of low-voltage electrical appliances, it has the "heart of low-voltage electrical appliances". It is widely used in relays, circuit breakers, contactors, sensors, industrial control and other products. Electrical contact materials include fixed, sliding and separable contact elements.

Carbon brushes made of matrix binder resin and reinforced carbonaceous aggregates are a typical sliding electrical contact material, which is the core component to maintain the normal operation of sliding and rotating electromechanical systems and friction systems. However, this type of material has the following shortcomings: ① The surface of the carbonaceous aggregate graphite powder contains only a small amount of free hydroxyl groups, resulting in poor interface bonding with the binder resin; ② Due to the poor fluidity of the binder during the kneading process, it is The materials are not uniformly dispersed, and it is easy to generate unavoidable random microcracks at the interface of the aggregate phase/binder phase. The above problems will lead to poor flexural strength of the carbon brush, unstable current-carrying friction and wear performance, poor wear resistance, etc., and even lead to the motor being burned.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, and to provide a carbonaceous aggregate that can improve the dispersibility of carbonaceous aggregates and the interface bonding strength between the aggregate phase and the matrix binder phase. A combined coupling agent modified by mass aggregate, modified carbonaceous aggregate and its preparation method and electrical contact material. In order to solve the above-mentioned technical problems, the technical scheme proposed by the present invention is:

A combined coupling agent for carbonaceous aggregate modification, comprising a borate coupling agent and a titanate coupling agent, and the ratio of the borate coupling agent and the titanate coupling agent is 1:(1-3).

In the above-mentioned combined coupling agent, preferably, it also includes an aluminate coupling agent, and the ratio of the borate coupling agent, titanate coupling agent and aluminate coupling agent is 1: (1 -3): (1-2).

Among the above-mentioned combined coupling agents, preferably, it is composed of the borate coupling agent, titanate coupling agent and aluminate coupling agent in a ratio of 1:3:1.

Among the above-mentioned combined coupling agents, preferably, the borate coupling agent includes one or more of borate LD-100P, borate ZB-99 and borate PEA; the titanic acid The ester coupling agent includes one or more of titanate TTS, titanate KHT-101, titanate KHT-302 and titanate 238S; the aluminate coupling agent includes aluminate DL- 411, one or more of aluminate SG-A1821 and aluminate DL-411DF.

In the present invention, the properties of the three coupling agents are different, and the coupling effects under a single action are also different. However, our research shows that the above three coupling agents can exert their own characteristics under the synergistic action and complement each other, so as to achieve better Good coupling effect, under the action of the coupling agent of this proportion, the performance of the electrical contact material finally measured is better than other proportions, so the coupling agent of this proportion is the preferred coupling agent proportion of the present invention . In addition, the preferred specific types of the above-mentioned boronate coupling agent, titanate coupling agent and aluminate coupling agent in the present invention can better ensure the synergistic effect of the three coupling agents. More preferably, our further research shows that the above-mentioned titanate coupling agent is titanate TTS, the borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411, The above three specific types of coupling agents have better synergistic effect.

As a general technical concept, the present invention also provides a modified carbonaceous aggregate modified by the above-mentioned combined coupling agent.

As a general technical concept, the present invention also provides a method for preparing the above-mentioned modified carbonaceous aggregate, comprising the following steps: preparing carbonaceous aggregate powder by an air-flow mixing method; and then atomizing the combined coupling agent solution The method is uniformly dispersed on the surface of the carbonaceous aggregate powder, and the modified carbonaceous aggregate is obtained after mixing uniformly.

In the above preparation method, preferably, the carbonaceous aggregate powder includes one or more of artificial graphite powder, flake graphite powder and isostatically pressed graphite powder.

In the above preparation method, preferably, the carbonaceous aggregate includes one or more of artificial graphite powder KS5-75TT, artificial graphite powder G800- and artificial graphite powder KS150-600SP.

As a general technical concept, the present invention also provides an electrical contact material, comprising the following components in parts by weight: 70-80 parts of modified carbonaceous aggregate, 20-30 parts of epoxy resin, and 1-4 parts of curing agent , 2-8 parts of WS ₂ powder, and the modified carbonaceous aggregate is the above-mentioned modified carbonaceous aggregate.

In the above electrical contact materials, preferably, the epoxy resin includes one or more of 656, 662E, 634 and 6101, and the curing agent is dicyandiamide.

The preparation process of the above electrical contact material is as follows: dry mixing the modified carbonaceous aggregate and WS ₂ powder, after uniform mixing, adding a solution containing epoxy resin and curing agent for wet mixing, drying, crushing, sieving, molding And the resin-type sliding electrical contact material is obtained after curing.

The idea of the present invention is: in order to improve the dispersibility of carbonaceous aggregates and the interface bonding strength between the aggregate phase and the matrix binder phase, the present invention proposes the idea of making up for congenital deficiencies. Based on the interface theory of composite materials, a combined type coupling The carbonaceous aggregate is pretreated with a joint agent. The details are as follows: 1. The carbonaceous aggregates can be effectively wetted and dispersed under the steric hindrance effect of the combined coupling agent, so that the agglomeration between the aggregates is weakened; structure”, which makes the liquid combined coupling agent around the carbonaceous aggregate form a network, and the pores are distributed among them, which can better fill the binder phase and enhance the interface strength; 3. "Bridge" function, the functional groups on the surface of the carbonaceous aggregate powder react with the groups of the combined coupling agent to form chemical bonds, and the long chain of the combined coupling agent is entangled with the epoxy resin molecules, forming a physical The increase of entanglement points makes the carbonaceous aggregate and resin combine to form a network-like skeleton structure (enhancing the internal pulling effect of the resin-type sliding electrical contact material, improving the mechanical strength of the material, and strengthening the micro-region of the resin-type sliding electrical contact material). structural integrity, stability and consistency, reducing internal defects), so that carbonaceous aggregate and resin are tightly integrated, and through the "bridge" effect of this combined coupling agent, the carbonaceous aggregate is improved. The bonding effect between the carbonaceous aggregate powder and the resin enhances the interface compatibility between the carbonaceous aggregate powder and the epoxy resin, improves the dispersibility of the carbonaceous aggregate in the resin matrix, and reduces the carbonaceous aggregate in the resin matrix. enrichment. 4. The inventor found through research that the combined coupling agent of the present invention can improve the dispersibility of WS ₂ powder and carbonaceous aggregates compared with other coupling agents by optimizing the composition and ratio. Under the action of the coupling agent, the WS ₂ powder is firmly adsorbed _on the surface ^of the carbonaceous aggregate, preventing the /cm ³ ) sedimentation of WS ₂ powder caused by a large difference in density (as shown in FIG. 3 ).

Regarding the above-mentioned mechanism of action of the present invention, a single coupling agent cannot achieve the above-mentioned effects well, and the function achieved by a single coupling agent is inferior to that of the combined coupling agent used in the present invention.

Compared with the prior art, the advantages of the present invention are:

On the one hand, the present invention solves the problem that the carbonaceous aggregate is easy to agglomerate and is difficult to disperse, overcomes the problems of poor interface bonding and material matching of resin-type sliding electrical contact materials, proposes a new type of combined coupling agent, and designs and prepares a It also provides ideas and theoretical basis for the preparation and process improvement of other composite materials with poor raw material powder dispersion and interface bonding problems, so as to realize their functionalization. At the same time, it expands the application range of the coupling agent, and also provides a theoretical basis and application research basis for the upgrading of resin-type sliding electrical contact materials. details as follows:

1. The present invention proposes the idea of making up for congenital deficiencies. Based on the interface theory of composite materials, the carbonaceous aggregate powder of the present invention can not only be effectively dispersed by itself, but also uniformly dispersed after being modified by a combined coupling agent. In the resin matrix, the interface between the carbonaceous aggregate and the resin is well bonded, and the "skeleton-branch" structure of the carbon-graphite system is constructed, which improves the mechanical strength and electrical conductivity of the material. Under the action, the WS ₂ powder added later can be effectively dispersed, and the sedimentation of the WS ₂ powder caused by the large difference in density between the carbonaceous aggregate and the WS ₂ powder can be overcome.

2. The combined coupling agent used in the present invention has the advantages of simple preparation, low price, various functions and wide application. The preparation method of the modified carbonaceous aggregate powder of the present invention is simple and easy to implement, low in cost, and good in modification effect, and the obtained product Stable performance.

3. The resin-type sliding electrical contact material of the present invention is prepared by modifying the carbonaceous aggregate powder with a combined coupling agent, and has well-matched resistivity and shore hardness, and improves the flexural strength and compression resistance. It has good mechanical strength and electrical contact performance, extending the service life of electrical contact materials. The flexural strength and compressive strength of the resin-type sliding electrical contact material prepared by the carbonaceous aggregate modified by the combined coupling agent are improved compared with those without the coupling agent modification, and the current-carrying wear performance is also improved. has been significantly improved.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present invention, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the flexural strength of the electrical contact material samples in Examples 1-3 and Comparative Example 1. FIG.

FIG. 2 is a schematic diagram of the compressive strength of the electrical contact material samples in Examples 1-3 and Comparative Example 1. FIG.

3 is the SEM photographs of the resin-type sliding electrical contact material powders in Example 1 and Comparative Example 1 (a) without adding a coupling agent; (b) adding the combined coupling agent in Example 1.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments of the specification, but the protection scope of the present invention is not limited to the following specific embodiments.

Unless otherwise defined, all technical terms used hereinafter have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the protection scope of the present invention.

Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or can be prepared by existing methods.

Example 1:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent: aluminate coupling agent is 3:1:1, the above titanic acid The ester coupling agent is titanate TTS, the borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

The above samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength (as shown in Figure 1) and compressive strength (as shown in Figure 2) were measured and tested. The data are shown in Table 1 below:

Table 1: Performance data for the sample of Example 1

The SEM image of the powder used to prepare the resin-type sliding electrical contact material in this example is shown in FIG. 3(b).

Example 2:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent: aluminate coupling agent is 2:1:2, the above titanic acid The ester coupling agent is titanate TTS, the borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength (as shown in Figure 1), compressive strength ( As shown in Figure 2), the test data are shown in Table 2 below:

Table 2: Performance data for Example 2 samples

Example 3:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent: aluminate coupling agent is 1:1:1, the above titanic acid The ester coupling agent is titanate TTS, the borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength (as shown in Figure 1), compressive strength ( As shown in Figure 2), the test data are shown in Table 3 below:

Table 3: Performance data for Example 3 samples

Example 4:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent is 3:1, and the above titanate coupling agent is titanate TTS , The borate coupling agent is borate LD-100P.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 4 shown:

Table 4: Performance data for Example 4 samples

Example 5:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent: aluminate coupling agent is 3:1:1, the above titanic acid The ester coupling agent is titanate KHT-101, the borate coupling agent is borate ZB-99, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 5 shown:

Table 5: Performance data for Example 5 samples

Example 6:

A combined coupling agent for carbonaceous aggregate modification, the ratio of titanate coupling agent: borate coupling agent: aluminate coupling agent is 3:1:1, the above titanic acid The ester coupling agent is titanate KHT-101, the borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 6 shown:

Table 6: Performance data for Example 6 samples

Comparative Example 1:

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after dissolving, they are added to the container containing the carbonaceous aggregate, and after mixing uniformly, they are dried, crushed and sieved. , molding, and curing to obtain a resin-type sliding electrical contact material, wherein the curing temperature curve is 0℃-40℃-205℃, the first heating time is 10min, the second heating time is 4h, and the temperature is kept at 205℃ for 2h, and then Cool to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength (as shown in Figure 1), compressive strength ( As shown in Figure 2), the test data are shown in Table 7 below:

Table 7: Performance Data of Comparative Example 1 Samples

Figure 3(a) shows the SEM image of the powder used to prepare the resin-type sliding electrical contact material in this comparative example.

Comparative Example 2:

A combined coupling agent used for modification of carbonaceous aggregates, the ratio of titanate coupling agent: silane coupling agent: aluminate coupling agent is 3:1:1. The above-mentioned titanate coupling agent is titanate TTS, the silane coupling agent is KH570, and the aluminate coupling agent is aluminate DL-411.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after dissolving, they are added to the container containing the carbonaceous aggregate, and after mixing uniformly, they are dried, crushed and sieved. , molding, and curing to obtain a resin-type sliding electrical contact material, wherein the curing temperature curve is 0℃-40℃-205℃, the first heating time is 10min, the second heating time is 4h, and the temperature is kept at 205℃ for 2h, and then Cool to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 8 shown:

Table 8: Performance Data for Comparative Example 2 Samples

Comparative Example 3:

A combined coupling agent used for carbonaceous aggregate modification, the ratio of titanate coupling agent: silane coupling agent: borate coupling agent is 3:1:1. The above-mentioned titanate coupling agent is titanate TTS, the silane coupling agent is KH570, and the borate coupling agent is borate LD-100P.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) carbonaceous aggregate powder is prepared by air mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after dissolving, they are added to the container containing the carbonaceous aggregate, and after mixing uniformly, they are dried, crushed and sieved. , molding, and curing to obtain a resin-type sliding electrical contact material, wherein the curing temperature curve is 0℃-40℃-205℃, the first heating time is 10min, the second heating time is 4h, and the temperature is kept at 205℃ for 2h, and then Cool to room temperature with the furnace to obtain the final sample.

Using the same measurement method as Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 9 shown:

Table 9: Performance Data of Comparative Example 3 Samples

Comparative Example 4:

A combined coupling agent for carbonaceous aggregate modification, the ratio of silane coupling agent: aluminate coupling agent: borate coupling agent is 3:1:1. The above-mentioned silane coupling agent is KH570, the aluminate coupling agent is aluminate DL-411, and the borate coupling agent is borate LD-100P.

A modified carbonaceous aggregate is obtained by modifying the above-mentioned combined coupling agent, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) The combined coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

An electrical resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after dissolving, they are added to the container containing the carbonaceous aggregate, and after mixing uniformly, they are dried, crushed and sieved. , molding, and curing to obtain a resin-type sliding electrical contact material, wherein the curing temperature curve is 0℃-40℃-205℃, the first heating time is 10min, the second heating time is 4h, and the temperature is kept at 205℃ for 2h, and then Cool to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 10 shown:

Table 10: Performance Data for Comparative Example 4 Samples

Comparative Example 5:

A combined coupling agent ratio is titanate coupling agent: borate coupling agent: aluminate coupling agent is 3:1:1, and the above titanate coupling agent is titanate TTS, The borate coupling agent is borate LD-100P, and the aluminate coupling agent is aluminate DL-411.

The preparation process of a resin-type sliding electrical contact material is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) A combined coupling agent solution with a mass fraction of 3% by mass of carbonaceous aggregate powder is prepared;

(3) Add the combined coupling agent solution of step (2) directly into the carbonaceous aggregate powder, and mix evenly

(4) Add the epoxy resin and the curing agent into the acetone solution, add them to the step (3) after dissolving, and after mixing evenly, then drying, crushing, sieving, molding, and curing to obtain a resin-type sliding Electrical contact material, in which the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, the temperature is kept at 205°C for 2h, and then cooled to room temperature with the furnace to obtain the final sample .

The above resin-type sliding electrical contact material includes the following components in parts by weight: 75 parts of carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 11 shown:

Table 11: Performance Data for Comparative Example 5 Samples

Aggregate graphite powder is easy to agglomerate. It is pre-modified by the combined coupling agent and pre-dispersed by the combined coupling agent, so that the coupling agent can coat the aggregate phase, so as to achieve a good dispersion effect, and also enhance the later addition. After the phase binder resin, the dispersion of the aggregate phase in the matrix resin can be enhanced. However, using the operation method of this comparative example, the aggregate dispersion is not ideal, which is why the combined coupling agent is used to pre-treat the aggregate graphite powder.

Comparative Example 6:

A modified carbonaceous aggregate is obtained by modification with a borate coupling agent, and the borate coupling agent is borate LD-100P, and the specific process is as follows:

(1) Preparation of carbonaceous aggregate powder by airflow mixing method;

(2) The borate coupling agent solution whose quality is 3% by mass of carbonaceous aggregate powder is configured;

(3) The borate coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by atomization, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 12 shown:

Table 12: Performance Data for Comparative Example 6 Samples

Comparative Example 7:

A modified carbonaceous aggregate is obtained by modifying a titanate coupling agent, wherein the titanate coupling agent is titanate TTS, and the specific process is as follows:

(1) carbonaceous aggregate powder is prepared by air mixing method;

(2) configure the titanate coupling agent solution whose quality is 3% by mass of carbonaceous aggregate powder;

(3) The titanate coupling agent solution in step (2) is uniformly dispersed on the surface of the carbonaceous aggregate powder by the atomization method, and the treated modified carbonaceous aggregate powder is obtained after mixing uniformly.

A resin-type sliding electrical contact material comprises the following components in parts by weight: 75 parts of modified carbonaceous aggregate, 22 parts of epoxy resin, and 3 parts of WS ₂ powder. On the basis of the above, the mass of the curing agent dicyandiamide accounts for 3.5% of the mass of the epoxy resin. The preparation process of the above-mentioned electrical contact material is as follows: the epoxy resin and the curing agent are added to the acetone solution, and after being dissolved, they are added to the container containing the modified carbonaceous aggregate, and after mixing uniformly, they are dried, crushed, and then dried. Resin-type sliding electrical contact material is obtained after screening, molding and curing, wherein the curing temperature curve is 0°C-40°C-205°C, the heating time of the first stage is 10min, the heating time of the second stage is 4h, and the temperature is kept at 205°C for 2h , and then cooled to room temperature with the furnace to obtain the final sample.

Using the same measurement method as in Example 1, the above-mentioned samples were measured for bulk density, resistivity, and Shore hardness, and then the samples were made into standard samples, and the flexural strength and compressive strength were measured. The test data are as follows in Table 13 shown:

Table 13: Performance Data for Comparative Example 7 Samples

Claims (8)

1. a combined coupling agent for carbonaceous aggregate modification, is characterized in that, comprises borate coupling agent, titanate coupling agent and aluminate coupling agent, described borate The ratio of coupling agent, titanate coupling agent and aluminate coupling agent is 1:3:1. 2. The combined coupling agent according to claim 1, wherein the borate coupling agent comprises one of borate LD-100P, borate ZB-99 and borate PEA or more; the titanate coupling agent includes one or more of titanate TTS, titanate KHT-101, titanate KHT-302 and titanate 238S; the aluminate couple The linking agent includes one or more of aluminate DL-411, aluminate SG-A1821 and aluminate DL-411DF. 3. A modified carbonaceous aggregate obtained by modifying the combined coupling agent according to any one of claims 1-2. 4. A preparation method of modified carbonaceous aggregate as claimed in claim 3, characterized in that, comprising the steps of: preparing carbonaceous aggregate powder by an air-flow mixing method; then passing the combined coupling agent solution through a mist The chemical method is uniformly dispersed on the surface of the carbonaceous aggregate powder, and the modified carbonaceous aggregate is obtained after mixing uniformly. 5 . The preparation method according to claim 4 , wherein the carbonaceous aggregate powder comprises one or more of artificial graphite powder, flake graphite powder and isostatically pressed graphite powder. 6 . 6. The preparation method according to claim 5, wherein the carbonaceous aggregate comprises one or more of artificial graphite powder KS5-75TT, artificial graphite powder G800 and artificial graphite powder KS150-600SP. 7. An electrical contact material, characterized in that it comprises the following components in parts by weight: 70-80 parts of modified carbonaceous aggregate, 20-30 parts of epoxy resin, 1-4 parts of curing agent, 2 parts of WS ₂ powder -8 parts; the modified carbonaceous aggregate is the modified carbonaceous aggregate described in claim 3 or the modified carbonaceous aggregate obtained by the preparation method described in any one of claims 4-6. 8. The electrical contact material according to claim 7, wherein the epoxy resin comprises one or more of 656, 662E, 634 and 6101, and the curing agent is dicyandiamide.

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