JP3112993B2 - Manufacturing method of composite material of nylon and ceramics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for producing a composite material of nylon and ceramics. That is, the present invention relates to a method for producing a composite material of nylon and ceramics, which is injection molded into a predetermined shape and widely used for various purposes.

[0002]

2. Description of the Related Art Nylon is generally superior in impact resistance to other resin materials and the like. Therefore, it is injection molded into a predetermined shape and widely used for various structural materials, mechanical parts, electric parts, gears, and the like. In addition, a mixture of ceramic particles in such a nylon at a weight ratio of about 30% or less is also used. Because the viscosity will be extremely reduced in
Conventionally, it has been difficult. That is, in the case where the ceramic particles were mixed at a weight ratio of 30% or more into nylon, the viscosity was extremely reduced due to the friction of the surface of the ceramic particles, and molding failure was easily caused.

[0003]

The following problems have been pointed out in such a conventional example. First, there was a problem in wear resistance. That is, in the conventional example using nylon as described above, the wear resistance is inferior to that of a metal material such as an iron-based material, and damage such as scratches is likely to occur. For example, when used as a gear, it has a great difficulty. . Secondly, there is a problem in electrical characteristics such as electrical insulation. That is, as described above, the conventional example using nylon has high water absorption, so that the electric properties such as electric insulation, dielectric properties, arc resistance and the like are inferior to those using an epoxy material or the like. Had major difficulties.

The present invention has been made in view of the above circumstances, and has been made to solve the above-mentioned problems of the prior art. First, a ceramic is manufactured by using a coupling agent to reduce the friction coefficient of the particle surface. After the treatment, a large amount of such ceramic particles were mixed with molten nylon and pelletized as a material, and injection molding was performed. Can be obtained without causing molding defects. This composite material is firstly excellent in impact resistance, secondly, excellent in abrasion resistance, and thirdly, excellent in electrical characteristics such as electrical insulation, and is a composite material of nylon and ceramics. The purpose of the present invention is to propose a manufacturing method.

[0005]

The technical means of the present invention for achieving this object is as follows. That is, in this method of manufacturing a composite material of nylon and ceramics, first, a surface treatment for reducing the friction coefficient of the ceramic particle surface is performed using a coupling agent such as a silicon-based, titanium-based, or aluminum-based material. Next, after melting the nylon and mixing a large amount of the ceramic particles, injection molding is performed using the pelletized material as a material.
As a result, a composite material of nylon and ceramics is obtained in which the ceramic particles have a predetermined shape and are mixed with the ceramic particles in a weight ratio of 50% or more.

[0006]

The present invention comprises the above means and operates as follows. In this manufacturing method, first, a ceramic is subjected to a surface treatment using a coupling agent to reduce the friction coefficient of the particle surface, and then such a large amount of ceramic particles are mixed into nylon, pelletized, and injection molded. I do. Thus, a composite material in which ceramic particles are mixed in a weight ratio of 50% or more in nylon can be obtained without causing molding defects. That is,
Since the decrease in viscosity due to friction of the surface of the ceramic particles is avoided by the above-described surface treatment, a composite material containing a large amount of ceramic can be formed without forming defects. And the composite material obtained in this way is as follows. First, the composite material has excellent impact resistance by utilizing the properties of nylon. The second with this
In addition, since this composite material has an extremely large ceramic content, the weak points of nylon are reinforced and the wear resistance is excellent. Third, the composite material also has a high ceramic content and reinforces the weaknesses of nylon, and is also excellent in electrical properties such as electrical insulation, dielectric properties, and arc resistance.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 to FIG. 5 are provided for explanation of an embodiment of the present invention, and will be described with reference to these drawings. In this manufacturing method, ceramics 1
Is subjected to a surface treatment 2 for reducing the friction coefficient of the particle surface. FIG. 1 (1) is an explanatory front view showing particles of the ceramic 1, and FIG. 1 (2) is an enlarged view of a main part thereof. As the ceramics 1, for example, alumina, silicon carbide, zirconia, quartz glass, and other aluminum-based, carbide-based, nitride-based, glass-based, and other materials are selectively used depending on the application.
Is used in the form of particles, that is, in the form of powder, fine particles, fibrous, and other various particles. Then, such a ceramic 1 is subjected to a surface treatment 2 using a coupling agent such as a silicon-based, titanium-based, or aluminum-based material to reduce the friction coefficient of the particle surface. In addition, 3 in the figure is a plate.

Next, in this manufacturing method, as shown in FIG. 2 or FIG. 3, the nylon 4 is melted, and a large amount of ceramics 1 particles are mixed therein. ). The particles of the ceramics 1 are used in such a large amount as to be mixed in the nylon 4 at a weight ratio of 50% or more (preferably about 70 to 90%) in the nylon 4 after the fact. Nylon 4 is used in an amount commensurate with the weight ratio of such ceramics 1, and a pellet or powder is melted by heating and pressing. In addition, when the particles of the ceramics 1 are mixed at such a high weight ratio in the melted nylon 4, the viscosity of the particles generally becomes extremely low due to friction of the surface of the particles, resulting in molding failure. As described above, since the ceramics 1 has been subjected to the surface treatment 2 for reducing the friction coefficient of the particle surface, such a decrease in viscosity is prevented, and molding defects do not occur.

FIG. 2 is an explanatory front view showing an example of such a pellet 5 forming step, and FIG.
It is front explanatory drawing which shows the other example of a shaping | molding process. First, in the example of FIG. 2, a kneader 6 is used, a predetermined amount of particles of ceramics 1 are mixed into the melted nylon 4, and the two are kneaded and kneaded by the stirring blade 7, and then the mold 8 is formed. It is poured, cooled, cut and cut into pellets 5. In another example of FIG. 3, an extruder 9 is used, and powdery nylon 4 and particles of powdery ceramics 1 are supplied to a hopper 10 where nylon 4 is melted in a heating cylinder. At the same time, the particles of the ceramics 1 are mixed, and both are kneaded by a screw and extruded. Then, the pellets are cut by the blade of the pelletizing device 11 and pelletized.

Thereafter, in this manufacturing method, injection molding is performed using a material obtained by mixing a predetermined amount of the ceramics 1 particles into the nylon 4 into pellets 5 as a material. FIG. 4 is an explanatory front view of such an injection molding process. As shown in FIG. 4, a pellet 5 made of nylon 4 and ceramics 1 is supplied to a hopper 13 of an injection molding machine 12, and a heating cylinder thereof is provided. It is melted and fluidized inside and is injected into the mold 14 from the nozzle. In this way, the composite material 15 of the nylon 4 and the ceramics 1 is injection-molded into a predetermined shape, and the particles of the ceramics 1 are mixed in the nylon 4 at a weight ratio of 50% or more (for example, about 70 to 90%). Is obtained. FIG.
FIG. 1 is a schematic perspective view of a structural material that is an example of such a composite material 15. In this composite material 15, a large amount of ceramic 1 particles are close to each other,
Are uniformly filled between such ceramics 1 to completely fill them, and thereby the ceramics 1 are strongly bonded.

Nylon 4 and ceramics 1 according to the present invention
The method of manufacturing the composite material 15 is as described above. Then, it becomes as follows. The composite material 15 of the nylon 4 and the ceramics 1 is injection-molded by an injection molding machine 12 (see FIG. 4), and the particles of the ceramics 1 in the nylon 4 have a weight ratio of 50% or more (for example, 70 to 90%). (See FIG. 5). In the manufacturing method, first, the surface of the particles of the ceramics 1 is subjected to a surface treatment 2 using a coupling agent to reduce the friction coefficient (see FIG. 1), and then the surface treatment 2 is used to reduce the friction coefficient as described above. A large amount of ceramics 1 particles having been subjected to the mixing are mixed into nylon 4 and formed into pellets 5 (see FIGS. 2 and 3), which are injection-molded (see FIG. 4). The composite material 15 containing the particles of the ceramics 1 can be obtained without causing molding failure. That is, a decrease in viscosity due to friction of the particle surface of the ceramics 1 is avoided by the above-described surface treatment 2, and the composite material 15 containing a large amount of the ceramics 1 is formed without forming defects.

The composite material 1 thus obtained is
Reference numeral 5 denotes the following first, second, and third. First
In addition, the composite material 15 thus formed is filled with the gaps between the particles of the ceramics 1 and filled with the nylon 4 and joined, so that the composite material 15 is excellent in impact resistance utilizing the properties of the nylon 4.
That is, the composite material 15 is excellent in impact resistance. At the same time, secondly, in the composite material 15, the particles of the ceramics 1 are mixed in the nylon 4 at a weight ratio of 50% or more, and the content of the ceramics 1 is extremely large. Excellent in nature. That is, the composite material 15 has the same wear resistance as that using, for example, a metal material such as an iron-based material or a stone material such as marble, and can be used without any trouble for gears and the like. Third, the composite material 15 also has a high content of ceramics 1 and reinforces the weak points of nylon 4, and is also excellent in electrical properties such as electrical insulation, dielectric properties, and arc resistance. That is,
This composite material 15 is made up of the ceramics 1 in which the water absorption of the nylon 4 is supplemented by a large amount of ceramics 1 and has, for example, the same electrical characteristics as those using an epoxy material, etc. It can be used for electric parts without any trouble.

[0013]

As described above, according to the production method of the present invention, a ceramic is first subjected to a surface treatment for reducing the friction coefficient of the particle surface using a coupling agent, and then a large amount of such ceramic particles are produced. Is mixed with molten nylon and pelletized as a material,
By performing injection molding, a composite material in which ceramic particles are mixed at a weight ratio of 50% or more in nylon can be obtained without causing molding defects. The composite material thus obtained is, firstly, excellent in impact resistance, hardly cracked or broken even when subjected to impact, and secondly, excellent in wear resistance, and is free from damage such as scratches. Third, it is excellent in electrical properties such as electrical insulation, dielectric properties, and arc resistance. Therefore, this composite material can be used widely and without problems in various structural materials, mechanical parts, electric parts, gears, and other applications, and the problems existing in this type of conventional example are eliminated. The effects exhibited by the invention are remarkably large.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an embodiment of a method for producing a composite material of nylon and ceramics according to the present invention. FIG. 1A is an explanatory front view showing ceramic particles, and FIG. It is an enlarged view.

FIG. 2 is an explanatory front view showing an example of the pellet forming step.

FIG. 3 is an explanatory front view showing another example of the pellet forming step.

FIG. 4 is an explanatory front view of the injection molding step.

FIG. 5 is a schematic perspective view of a composite material for describing an example of a method for producing a composite material of nylon and ceramics according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramics 2 Surface treatment 3 Plate 4 Nylon 5 Pellet 6 Kneader 7 Stirring blade 8 Die 9 Extruder 10 Hopper 11 Pelletizing device 12 Injection molding machine 13 Hopper 14 Die 15 Composite

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 45/00-45/24

Claims (1)

(57) [Claims] First, a silicon-based, a titanium-based, and an aluminum-based
Using a coupling agent such as this , a surface treatment is performed to reduce the friction coefficient of the surface of the ceramic particles, and then nylon is melted and a large amount of the ceramic particles are mixed in, and then pelletized. Nylon and ceramics obtained by performing injection molding as a material, thereby obtaining a composite material of nylon and ceramics having a predetermined shape, wherein said ceramic particles are mixed in a weight ratio of 50% or more in said nylon. Of manufacturing composite materials.