JPH02191672A - Oil-containing composite heating form, production thereof and track for high-speed mobile body - Google Patents

Abstract

PURPOSE:To obtain the title composite heating form excellent in sliding nature, thus suitable for track for high-speed mobile body by forming a composite heating form by heating a blend comprising a fluororesin, inorganic material and another heat-resistant resin and by including an oily material into the voids of said form. CONSTITUTION:The objective composite heating form made up of (A) a fluororesin (e.g. tetrafluoroethylene resin), (B) an inorganic material (e.g. metallic oxide, graphite), (C) a heat-resistant resin other than the component A (e.g. polyphenylene sulfide) and (D) 0.5-20%, on a volume basis, of an oily material (e.g. fluorine-based oil, silicone-based oil). This form can be obtained by the following process: a blend comprising the components A, B and C is heated to form a composite heating form followed by impregnation of the component D; alternatively, the components A, B, C and D are blended and heated. The final form thus obtained has such a mutually intruded network structure with the netty components A and C mutually entangled along with involving the component B and furthermore including the component D in the voids of said network structure.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil-containing composite heating body, a method for producing the same, and a running track for a high-speed moving body, and particularly relates to an oil-containing composite heating body, a method for manufacturing the same, and a running track for a high-speed moving body, and particularly relates to a porous composite heating body made of a fluororesin, an inorganic substance, and a heat-resistant resin. An oil-containing composite heating body capable of imparting lubricity to non-sliding parts of aluminum, rubber products, etc. by containing an oily substance in the voids of the composite heating body by a method such as initial mixing or impregnation, and its production. The present invention relates to a method and a running track for high-speed moving bodies that prevents wear of rubber tires of high-speed moving bodies such as linear motor cars and aircraft.

[Problems to be solved by conventional technology and inventions] Conventionally, rubber products such as those for linear motor cars and aircraft have characteristics that far exceed those originally required for rubber products, which must respond to high-speed friction phenomena. It is actually used in the actual usage environment.

Under such usage environments, the rubber properties of rubber products include sliding properties, that is, a low coefficient of friction, in order to prevent rubber wear and damage caused by heat generation, as well as the conventional anti-slip function. There is a need. In this way, rubber products are required to have multiple functions instead of conventional single functions.

On the other hand, in cases where safety is extremely important, such as in linear motor cars and aircraft, there is a problem in that the rubber tires must be replaced after several hundred landings, making them uneconomical.

Conventional methods for imparting lubricity to non-sliding parts include solid lubrication methods using solids such as polytetrafluoroethylene resin (PTFE), molybdenum disulfide, carbon, and carbides;
There are various methods, including liquid lubrication using lubricating oil and mechanical methods using parts such as bearings, and these are used in many industrial fields. Conventional products for providing lubricity (sliding products) are often designed with metal as the mating material, but in the case of soft metals such as aluminum, the metal side will wear significantly. Furthermore, if the mating material is resin, many scratches will occur on the surface of the resin when it is slid, making it impossible to achieve its performance as a sliding product. When the mating material is a rubber product, it is difficult to sufficiently reduce the coefficient of friction with conventional sliding products.

Furthermore, although ball bearings are sliding products with the best performance, they are more expensive than other sliding products. Inexpensive sliding products include sintered metals containing lubricating oil, but in terms of performance, as mentioned above, many metal materials exhibit a certain degree of sliding performance, but soft metals, rubber, etc. It is not showing sufficient performance. As described above, the current situation is that there is no sliding product that satisfies both performance and price points.

The present invention has been made in view of the above points, and is an oil that is inexpensive and can exhibit sufficient sliding performance for sliding products such as soft rubber, plastic, and aluminum, which are called dissociative materials. The object of the present invention is to provide a composite heating body containing the present invention.

Another object of the present invention is to provide a method for manufacturing an oil-containing composite heating body.

Another object of the present invention is to provide a running track for a high-speed moving body that prevents significant wear of the rubber tires of the high-speed moving body and protects the running road surface.

[Means to solve the problem]

In order to achieve the above object, the oil-containing composite heating body of the present invention has an intermeshed network structure in which a reticulated fluororesin and a reticulated heat-resistant resin other than the fluororesin are interposed and contain an inorganic substance, An oily substance is contained in the voids of the intervening network structure.

At least one fluororesin selected from the group consisting of tetrafluoroethylene resin, tetrafluoroethylene-perfluoroalkyl copolymer, and tetrafluoroethylene-hexafluoropropylene copolymer can be used.

The inorganic substance can be selected from the group consisting of metal oxides, metal nitrides, metal carbides, metal sulfides, pure metals, alloys, and graphite.

At least one metal oxide selected from the group consisting of alumina, zirconia, silica, titania, calcia, magnesium oxide, molybdenum oxide, and zinc oxide can be used.

As the metal nitride, at least one of silicon nitride and titanium nitride can be used.

Silicon carbide can be used as the metal carbide.

Pure metals are copper, silver, gold, platinum, vanadium, molybdenum,
At least one type from the group of Nitsuchenopetungsten can be selected and used.

At least one alloy can be selected from the group of stainless steel, brass, aluminum alloy, and magnesium alloy.

At least one oily substance selected from the group of fluorine-based oils, silicone-based oils, and synthetic lubricating oils can be used.

The heat-resistant resin can be selected from the group consisting of polyphenylene sulfide, polyamideimide, polyimide, polyether sulfone, polyether ether ketone, epoxy resin, phenol resin, and ester resin.

The amount of oily substances added is 0.5 to 20.0% in terms of volume ratio.
can be in the range of

The above oil-containing composite heating body can be manufactured by heating a mixture consisting of a fluororesin, an inorganic substance, and a heat-resistant resin excluding the fluororesin to form a composite heating body, and then impregnating it with an oily substance.

Moreover, the above oil-containing composite heating body can be manufactured by mixing a fluororesin, an inorganic substance, a heat-resistant resin other than the fluororesin, and an oily substance and then heating the mixture.

The high-speed moving body running track of the present invention has the oil-containing composite heating body disposed at the initial contact portion with the rubber tires of the high-speed moving body.

[Effect]

In the oil-containing composite heating body of the present invention, the fluororesin and the heat-resistant resin other than the fluororesin flow into a network shape due to molding pressure, heating temperature during baking, etc., and the network-like fluororesin and the network-like heat-resistant resin form a highly It has an interwoven network structure that is intertwined with each other and contains inorganic substances, and by mixing and dispersing oily substances into the pores (voids) of this mutually intervening network structure by a method such as impregnation, the lubricating performance can be significantly improved. It is something that

This mutually intervening network structure is formed by maintaining appropriate conditions for pressure during pressure molding, temperature during firing, atmospheric pressure during firing, and press pressure. It is a three-dimensional network structure that is intertwined with each other in a net-like manner by pressurized flow or thermal flow. FIG. 1 shows an example of a mutually intervening network structure. In the figure, 1 is an inorganic substance, 2 is a fluororesin, 3 is a heat-resistant resin other than the fluororesin, 4 is an oily substance, and 5 is a void. As seen in Fig. 1, the reticulated fluororesin 2 and the reticulated heat-resistant resin 3 excluding the fluororesin form a three-dimensional network while incorporating inorganic substances, and the network formed by the bonds between the fluororesin 2 and the fluororesin The network of the heat-resistant resin 3 except for the heat-resistant resin 3 has a highly interwoven network structure. An oily substance 4 is contained in the voids 5 existing between the fluororesin network and the heat-resistant resin network by an operation such as initial mixing or impregnation after forming the composite heating body.

In the present invention, problems such as scratches at the interface, generation of sludge, and seizure due to abnormal heat generation at the interface are solved by the synergistic effect of the lubricating properties of the fluororesin and the oily substance.

The fluororesin of the present invention is tetrafluoroethylene resin (PTFE).
), tetrafluoroethylene-perfluoroalkyl copolymer (PEF), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-chlorotrifluoroethylene copolymer, ethylene tetrafluoroethylene copolymer Union,
Polyvinylidene fluoride and polychlorinated trifluoroethylene copolymers can be used. Particularly suitable are tetrafluoroethylene resin and tetrafluoroethylene-perfluoroalkyl copolymer of tetrafluoroethylene-hexafluoropropylene.

Inorganic substances include metal oxides such as alumina, zirconia, calcia, titania, zinc oxide, silica, magnesium oxide, and molybdenum oxide, metal nitrides such as silicon nitride and titanium nitride, metal carbides such as silicon carbide, and silicon sulfide. Powders of metal sulfides, pure metals such as copper, silver, gold, platinum, vanadium, molybdenum, nickel, and tungsten, and alloys such as stainless steel, brass, aluminum alloys, and magnesium alloys can be used. In particular, alumina and zirconia powders are suitable. If the average particle size of the inorganic substance is within the range of 1 to 20 μm, it will have almost no negative effect on the t-mesh material, but in order to prevent wear of the mating material, the maximum particle size should be 20 μm or less. This is desirable. Further, there are no particular restrictions on the shape of the inorganic material, but if the top priority is to prevent wear of the mating material, the sphericity should be 0.9 or more and 1. A spherical shape is desirable.

Further, as the heat-resistant resin used in the present invention, polyphenylene sulfide (PPS), polyamideimide, polyimide, polyether sulfone, polyether ether ketone (PEEK), epoxy resin, phenol resin, and ester resin can be used. In particular, products using polyphenylene sulfide and polyamideimide exhibit excellent physical properties.

Examples of oily substances include fluorine-based oils (perfluoroalkyl oils), silicone oils (dimethyl silicone oil, methylphenyl silicone oil), and various other machine oils (organic acid esters, hydrocarbon oils, polyglycols, phosphoric acids, etc.). All lubricating oils such as esters and organic ethers can be used. Among them, fluorinated oil has excellent impregnation performance, weather resistance, chemical resistance, and heat resistance.
Are suitable. The content of oily substance is 0.5 in terms of volume ratio.
It is preferably within the range of ~20%.

There are two methods for manufacturing an oil-containing composite heating body: a method of impregnating an oily substance into the voids of the formed composite heating body, and a method of mixing and molding all the components at once.

In the impregnation method, the problem is the porosity and the size of the voids in the composite heating element before impregnation. Although the appropriate value varies slightly depending on the viscosity and SP value of the oily substance, it is most preferable that the porosity is in the range of 15 to 30% and the size of the pores is about 50 to 200 μm. The porosity and the size of the voids depend on the particle size of the components constituting the composite heating body, the initial pressure, and the pressure during firing, and may be arbitrarily selected and set depending on the application and required physical properties. In addition, the method of mixing at once reduces the number of steps compared to the method of impregnating after impregnation, thereby improving productivity. However, there are restrictions on the oily substances that can be used, and only two types of oily substances, fluorine-based oil and silicone-based oil, can be used. Oily substances such as ordinary machine oil have a low decomposition temperature and cannot be used when heating above the decomposition temperature of the oily substance because most of it decomposes when the composite heating element is fired.

There are no particular restrictions on the processing method, and hot pressing, powder sintering, injection molding, etc. can be applied. Since it is necessary for an oil-containing composite heating element to have voids in which an oily substance can exist, it is undesirable to apply more pressure than necessary. Although it varies depending on the fluidity, dispersibility, etc. of the material, the pressure required for molding is 5°C for a mixture of fluororesins, inorganic substances, and heat-resistant resins excluding fluororesins.
Especially in the pressure range of 0 to 800 kg/cd, 100 to 350
A pressure in the range of kg/ca is desirable. After that, if pressure is required within the flowable temperature range of fluororesins and heat-resistant resins other than fluororesins, it is preferable to keep the pressure to a level that prevents warping of the composite heating element in order to prevent voids in the composite heating element from disappearing. . In addition, when processing by hot pressing, it is necessary to maintain the pressure at 30 kg/cd or less at a temperature higher than the flowable temperature of heat-resistant resins other than fluororesins.

There is no particular restriction on the method of mixing the oily substance and the subsequent impregnation method may be a vacuum impregnation method, a immersion impregnation method, or the like. Considering work efficiency, vacuum impregnation method is suitable. When mixing first, in the case of fluorine-based oil ν, the best method is to atomize a mixture of fluorine-based oil in the range of 10 to 3 Qwt% and mix it into the raw material powder. Similarly, the silicone oil may be mixed by dispersing the silicone oil in an aromatic organic solvent (toluene, xylene, ketone, etc.) and performing atomization mixing.

In addition, for the track materials of linear motor cars and the landing areas of aircraft, runways such as tracks and runways are constructed using oil-containing composite heating materials by methods such as gluing, bolting, inlaying, and integral construction with concrete. . However, there are no restrictions on the construction method as long as sufficient adhesion to the structure is achieved. in this case,
Oil-containing composite heating bodies are known for their ability to make initial contact with rubber tires of high-speed moving bodies on roadways. As a result, the rubber tires and the oil-containing composite heating body can be brought into contact only at the moment when the high-speed moving body lands on the ground, preventing significant wear from occurring, and then brought into contact with a running track having normal characteristics. Further, as methods for improving the strength of this smooth surface forming body, there are methods such as lining with a reinforcing plate or rod such as a glass-reinforced epoxy plate or metal plate, reinforcing fibers, impregnating with epoxy resin, etc.

[Effects of the Invention] Since the present invention has the solid lubricity of a fluororesin and the liquid lubricity of an oily substance, the synergistic effect of the two makes it suitable for sliding materials such as rubber, plastic, aluminum, etc. You can get animal products. This oil-containing composite heating element has high sliding properties as a product itself, and can be processed into any shape in post-processing, so it can have sliding properties equivalent to or better than that of a ball bearing. It is possible to reduce the cost of the entire product because it is both flexible and inexpensive.

In addition, the running track for high-speed moving objects of the present invention can prevent significant wear of tires used in high-speed moving objects such as linear motor cars and aircraft, and can protect the running road surface by absorbing shock. You can get the effect that you can do it.

〔Example〕

Example 1 PTFE powder with primary particle size of 10 μm, average particle size of 2.5
μm alumina and PPS powder in a weight ratio of 6:1.
The mixture was dry mixed at a ratio of 0:3 and molded into tablets at a pressure of 70 kg/c++f. This tablet weighs 70kg/
A load of cal was applied and firing was performed in an electric furnace at 350° C. for 30 minutes to obtain a composite heating body. This composite heating body was vacuum impregnated with fluorine-based oil to obtain an oil-containing composite heating body. A thrust abrasion test was conducted on this oil-containing composite heating body using 5US304, aluminum, and urethane rubber (rubber hardness: 90) as mating materials. For comparison, similar tests were conducted on an oil-impregnated sintered metal with excellent sliding properties and a fluororesin coating. The results are shown in Table 1.

Note) Wear conditions Speed: 30yn/min Load: 2kg Wearing ring Outer diameter: 22 x inner diameter: 18 (numbers outside the parentheses) Wear coefficient of the mating material (values inside the parentheses) Base material wear coefficient: As shown in Table 1 above, the In the case of hard materials, good sliding results were obtained with oil-impregnated sintered metal or fluororesin coating, but aluminum,
In the case of non-sliding parts such as urethane rubber, only oil-impregnated composites can give good results, and the oil-impregnated composite heating body of the present invention is a sliding material that can be applied to a wide range of applications from non-sliding parts to general metals. This was confirmed.

Example 2 PTFE powder, alumina with an average particle size of 4 μm, polyamide-imide powder, and fluorine oil in a weight ratio of 5:10
Wet mixing: 4:5 using Freon R113 as a dispersion medium,
200 kg/Cx at room temperature! The temperature was raised to 330° C. in a mold, and the mixture was held for 10 minutes to be baked and hardened to obtain an oil-containing composite heating body.

This oil-containing composite heating body was subjected to a wear test using a friction and wear tester (Japanese Patent Application No. 1-32251) using a rubber tire as a counterpart material. For comparison, a similar test was conducted on concrete. The results are shown in Table 2.

Table 2 Note) ■Wear conditions Test count: 100 times Tire diameter: 2
50m+nφ Tire width 20Illffl Tire peripheral speed 70km/h Load 2. 5kg/ci ■Frictional resistance...The maximum resistance during the test was detected by a load cell.

■ Heat generation temperature The tire surface temperature at the end of 100 wear tests was measured, and the highest temperature was taken as the heat generation temperature.

As mentioned above, the oil-containing composite heating body was significantly effective in lowering friction and preventing rubber wear compared to concrete, and in particular, the amount of tire wear was reduced to less than one-thirtieth, which was a great effect in reducing wear.

Figures 2 (1) to (3) show the shape of the oil-containing composite heating body. FIG. 2(1) shows a plate-shaped oil-containing composite heating body 10. In FIG. 2(2), a convex portion 10A and a concave portion 10B are formed on the side surface of the plate-shaped oil-containing composite heating body 10.

The convex portions 10A and recesses 10B of adjacent plate-shaped oil-containing composite heating bodies 10 are fitted to arrange the plate-shaped oil-containing composite heating bodies 10. In FIG. 2(3), slopes 12A and 12B are formed on the side surfaces of the plate-shaped oil-containing composite heating body IO. The plate-shaped oil-containing composite heating bodies are arranged by bringing the slopes 12A and 12B of adjacent plate-shaped oil-containing composite heating bodies 10 into contact with each other.

Oil-containing composite heating element 1 reinforced as shown in Fig. 3 (1) to (4)
Indicates 0. Figure 3 (1) shows a reinforcing plate 1 made of metal, FRP, etc.
(2) is a structure in which a plurality of reinforcing rods 16 made of the same material as the reinforcing plate 12 are bonded together. In FIG. 3(3), a reinforcing member 18 such as glass cloth or wire mesh is embedded in the oil-containing composite heating body 10. FIG. 3(4) shows an oil-containing composite heating body 10 and a resin-impregnated layer 20 formed integrally.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the mutually intervening network structure of the oil-containing composite heating body of the present invention, FIGS. 2 (1) to (3) are perspective views of the oil-containing composite heating body used for the running track, and FIG. 1) to (4) are perspective views for explaining a method for strengthening an oil-containing composite heating body. 1... Inorganic substance, 2... Fluororesin, 3... Heat resistant resin, 4... Oily substance, 5... Voids, 10... Oil-containing composite heating body.

Claims (14)

[Claims] (1) Consisting of an intermeshed network structure in which a reticulated fluororesin and a reticulated heat-resistant resin other than the fluororesin intervene with each other and contain an inorganic substance, and an oily substance is contained in the voids of the interposed network structure. Oil-containing composite heating element. (2) The fluororesin is at least one selected from the group of tetrafluoroethylene resin, tetrafluoroethylene-perfluoroalkyl copolymer, and tetrafluoroethylene-hexafluoropropylene copolymer ( 1) The oil-containing composite heating body described above. (3) The oil-containing composite heating according to claim (1), wherein the inorganic substance is at least one selected from the group of metal oxides, metal nitrides, metal carbides, metal sulfides, pure metals, alloys, and graphite. body. (4) The oil-containing composite heating body according to claim (3), wherein the metal oxide is at least one selected from the group consisting of alumina, zirconia, silica, titania, calcia, magnesium oxide, molybdenum oxide, and zinc oxide. (5) The oil-containing composite heating body according to claim (3), wherein the metal nitride is at least one of silicon nitride and titanium nitride. (6) Claim (3) wherein the metal carbide is silicon carbide.
The oil-containing composite heating body as described. (7) The oil-containing composite heating body according to claim (3), wherein the pure metal is at least one selected from the group consisting of copper, silver, gold, platinum, vanadium, molybdenum, nickel, and tungsten. (8) The oil-containing composite heating body according to claim (3), wherein the alloy is at least one selected from the group of stainless steel, brass, aluminum alloy, and magnesium alloy. (9) The oil-containing composite heating according to any one of (1) to (8), wherein the oily substance is at least one selected from the group of fluorine-based oil, silicone-based oil, and synthetic lubricating oil. body. (10) Claim (1) wherein the heat-resistant resin is at least one selected from the group consisting of polyphenylene sulfide, polyamideimide, polyimide, polyethersulfone, polyetheretherketone, epoxy resin, phenol resin, and ester resin. The oil-containing composite heating body according to any one of (9) to (9). (11) The content of the oily substance is 0.5 in terms of volume ratio
Claim (1) characterized in that it is in the range of ~20.0%
The oil-containing composite heating body according to any one of ) to (10). (12) A mixture consisting of a fluororesin, an inorganic substance, and a heat-resistant resin excluding the fluororesin is heated to form a composite heating body, and then impregnated with an oily substance to produce an oil-containing composite heating body. A method for producing an oil-containing composite heating element. (13) A method for producing an oil-containing composite heating body, which comprises mixing a fluororesin, an inorganic substance, a heat-resistant resin other than a fluororesin, and an oily substance and then heating the mixture to produce an oil-containing composite heating body. (14) A running track for a high-speed moving body, wherein the oil-containing composite heating body according to any one of claims (1) to (11) is disposed at an initial contact portion with a rubber tire of the high-speed moving body.