JPS593498B2 - Improved abrasive bristles - Google Patents

Description

[Detailed description of the invention] This invention relates to improved abrasive bristles.

More specifically, the present invention relates to improved abrasive bristles in which the abrasive bristles contain abrasive grains and a specific fiber compound to increase the abrasive power. Traditionally, materials to be polished are polished using a whetstone, abrasive paper or cloth,
and wire brushes have been used.

However, these abrasives have poor compatibility with the material being polished,
In order to improve this conformability, products in which abrasive grains are fixed to polymeric bristles with an adhesive have been developed. Although these polymer bristles for polishing have improved compatibility with the material to be polished, the bristles themselves are weak and unsatisfactory in terms of abrasive power, and therefore, their use is limited to cleaning steel plates. The reality is that it is only used.

On the other hand, the strong oxide film that occurs when steel is annealed is
Currently, mineral acids are used to remove the film, but as the treatment of waste acids has become a pollution problem, there is a demand for removal of the film by mechanical methods such as using a powerful abrasive. I have reached the point where

In order to cope with applications that require high abrasive power, methods such as increasing the thread diameter of the bristles, increasing the particle size of the abrasive grains, and reinforcing the outer surface of the bristles have been attempted. However, this method has been plagued by the phenomenon of bristles breaking due to excessive stress, and has not yet been successful in practice.

Furthermore, when the bristles with improved abrasive power are actually used, another drawback occurs. That is,
During actual use, a large number of bristles are planted on a rotating shaft having a constant diameter and width, and the bristles polish the surface of the material to be polished while rotating at a fairly high speed. At that time, especially when the bristles collide with or come into contact with the surface of the material to be polished, many of the bristles come into contact with each other, causing mutual rubbing, and the bristles are worn out before the desired purpose is achieved. However, the disadvantage was that the bristles were prone to breakage. The inventor of the present invention conducted intensive research to solve the above-mentioned drawbacks of the prior art, and as a result, developed the abrasive bristles of the present invention that met the above-mentioned requirements, and achieved the intended purpose.

That is, in the cross-sectional structure of abrasive bristles, the present invention covers the outer periphery of a melt-molded monofilament with a thermoplastic polymer as a sea component and heat-resistant fibers and abrasive grains as an island component. This is an improved abrasive bristles.

The configuration, effects, and embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view of the polishing bristles of the present invention, which contain heat-resistant fibers 2 and polishing abrasive grains 3 in the sea component 1.
The outer layer component 4 covers the outer periphery of the sea component 1.

Thermoplastic polymers include nylon 6, nylon 66,
Polyamides such as nylon 610, nylon 612, nylon 11, nylon 12, and copolymerized nylon containing these polyethylene terephthalate, polybutylene terephthalate, polyester containing these copolymers, polypropylene, polyvinyl alcohol, etc., and polyamides. , the effect is remarkable when polyesters are used.

Heat-resistant fibers include mineral fibers such as asbestos, rock wool, slag wool, silica fibers, and ceramic fibers, stainless steel, copper,
Metals or inorganic fibers made of aluminum, silicon nitride, silicon carbide, boron, carbon, and formulas.
, ,． One Do One One
) (in the formula, ARl and AR2 are aromatic groups, and n is an integer), and a typical example is polyamide fiber.
There are P-benzamide fibers and poly-m-benzamide fibers.

These heat-resistant fibers are used in an amount of 1 to 40 parts by weight per 100 parts by weight of the thermoplastic polymer, but the amount used varies depending on the physical properties (especially stiffness) and denyl of the fiber used, and generally It is preferably 30 parts by weight or less, especially when using ultrafine yarns or heat-resistant fibers with single yarns of around 1 denyl.
A suitable amount is around 0 parts by weight. If the weight part used exceeds the upper limit, the stiffness will be too high and the bristles will break when used in actual polishing applications, and if it is below the lower limit, the polishing power will not be improved. Note that the heat-resistant fiber needs to have a thermal decomposition temperature of 300°C or higher.

This is because the generation of decomposition gas during melt molding of the abrasive bristles of the present invention has undesirable consequences. The heat-resistant fiber used can be either fabric-woven or filament-woven.

In the case of a foam-shaped material, it is possible to blend it with thermoplastic polymer pellets or chips and abrasive grains, and then homogeneously melt-mix it in a melt extruder. The heat-resistant fibers 2 can be mixed into a bath-melted mixture 1 of abrasive grains and a thermoplastic polymer at the outlet of the spinneret.

The heat-resistant fibers can be sufficiently used for the purpose of the present invention if oils, moisture, dirt, etc. are removed beforehand, but a suitable adhesive may be used if necessary.

Epoxies, isocyanates, silane coupling agents, etc. are generally suitable, and the fibers may be pretreated with an adhesive or blended with raw materials and melt mixed in an extruder.

Any commonly used abrasive grains may be used as the abrasive grains, including fused alumina, silicon carbide, zirconia carbides, nitrides, borides, artificial abrasives such as artificial diamond, diamond, corundum, emerald, etc. Examples include natural abrasives such as garnet and silica stone, and glass. These may be used alone or in combination. The particle size of the abrasive grains is #
#40 to #1000 is preferred, and it is preferably used in a ratio of 10 to 70 parts by weight per 100 parts by weight of the thermoplastic polymer.

If it is less than 10%, no polishing power can be expected, and if it is more than 70 parts by weight, it becomes extremely difficult to form polishing bristles.

The outer layer is made of polyamides such as nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, and copolymerized nylons containing these; polyesters containing polyethylene terephthalate, polybutylene terephthalate, copolymers of these, etc., and polypropylene. , thermoplastic polymers such as polyvinyl alcohol, phenol,
Thermosetting polymers such as melamine, elastomer, unsaturated polyester, diallyl phthalate resin, epoxy resin rubbers, and polyurethanes are used, and are highly compatible and adhesive with the above-mentioned thermoplastic polymers. is used selectively.

The thickness of the outer layer is appropriately selected depending on the degree of wear of the abrasive bristles.

In addition, it is preferable to similarly mix heat-resistant fibers into the outer layer for the purpose of improving the polishing power.

The abrasive bristles of the invention can be obtained in various ways. For example, a method is to melt a thermoplastic polymer and add abrasive grains to it while stirring, or to mix the thermoplastic polymer particles or powder with abrasive grains and mold the mixture while melting it in an extruder. There is a way to do it. The heat-resistant fibers that are the object of the present invention may be mixed by combining the method described above with this method.

The abrasive bristles of the present invention are used for abrasive purposes in the form of threaded, flattened or other suitable forms.

The abrasive bristles of the present invention exhibit significant abrasive performance compared to conventional abrasive materials.

The abrasive bristles of the present invention are manufactured by the process shown in FIG. FIG. 2 illustrates an embodiment of manufacturing the abrasive bristles of the present invention, in which the molten thermoplastic polymer extruded from the melt extruder 5 is led to a cooling water tank 6, cooled and set, and the abrasive bristle yarn 8 It is passed through a roll 9 while being shaped into a shape, the outer periphery is coated with a molten mixture 7 containing heat-resistant fibers, and finally it is wound up on a winding device 10.

Next, examples of the present invention will be shown.

゛Example 1 Relative viscosity 335 (19 polymer/100d98% sulfuric acid)
Poly(1,4-phenylene terephthalamide) fiber (cut length 3) was added to 100 parts by weight of nylon 6 chips.
17! 5 parts by weight of 1.5 Denino (c) single yarn and 20 parts by weight of silicon carbide abrasive grains #100 were added and stirred.

This mixture was melt extruded using a melt extruder at 270° C., spun through a spinneret into water at room temperature, and after being stretched three times, bristles with a diameter of 1.0 ml were produced.

The bristles were passed through a solution consisting of N-methoxymethylated nylon 2509, methanol 750 g, and tartaric acid 69 and heated at 150°C x 90 hrs in a nitrogen stream to a thickness of 01 U1.
The desired bristles were obtained with a coating of . On the other hand, as a comparative example, bristles were produced under the same conditions except for the cotton fibers. The two polishing bristles mentioned above have a diameter of 3001 mm! L1 width 10? , a roll brush with thread length (trim) of 50IrL, 120
The polishing force on the stainless steel plate was measured at a circumferential speed of 0 m/min.

Table 1 shows the results.

As is clear from the results in Table 1, the brush manufactured using the abrasive bristles of the present invention had significantly improved abrasive power compared to the comparative example, and there was no wear due to co-rubbing between the bristles. .

Examples 2 to 5 25 parts by weight of silicon carbide abrasive grains #240 were added to 100 parts by weight of nylon 6 chips (relative viscosity 36) and mixed well.

This mixture was melted at 260° C. using a melt extruder and spun into room temperature water through a spinneret to obtain bristles with a diameter of 20 mm. At that time, a device with the structure shown in Figure 2 was installed, and the length of the heat-resistant fiber cut was 3 mm and the nylon 6
(relative viscosity 40) was coated.

On the other hand, as a comparative example, bristles were produced under the same conditions without mixing the puff-like heat-resistant fibers. These threads were made into a brush in the same manner as in Example 1.

Table 2 shows the results of the polishing test on silicon steel plates. As is clear from Table 2, the abrasive brush obtained from the bristles of the present invention has an outstanding abrasive power than the comparative example.

[Brief explanation of drawings]

Figure 1 is a cross-section (schematic) of the improved abrasive bristles of the present invention.
In the figure, 1 indicates a sea component (Natsumachi plastic polymer), 2 indicates heat-resistant fibers, 3 indicates abrasive grains, and 4 indicates an outer layer. FIG. 2 illustrates an embodiment of manufacturing the abrasive bristles of the present invention, in which 5 is a bath melt extruder, 6 is a cooling water tank, 7 is a molten mixture containing heat-resistant fibers, and 8 is abrasive bristles before coating. Yarn,
9 is a delivery roller, and 10 is a winding device.

Claims (1)

[Scope of Claims] 1. Improved abrasive bristles made by covering the outer periphery of a melt-molded monofilament with a thermoplastic polymer as a sea component and heat-resistant fibers and abrasive grains as an island component with an outer layer component. . 2 At least one selected from the group consisting of nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, and copolymerized nylon containing these; polyethylene terephthalate, polybutylene terephthalate, and copolymerized polyester containing these. The improved abrasive bristles of claim 1, which are thermoplastic polymers. 3. The improved polishing according to claim 1, wherein the heat-resistant fiber is at least one material selected from the group consisting of mineral fibers, inorganic fibers, and aromatic polyamide fibers having a thermal decomposition temperature of 300° C. or higher. Bristles for use. 4. The improved abrasive bristles according to claim 3, which are at least one mineral fiber selected from the group consisting of asbestos, rock wool, slag wool, silica fiber, and ceramic fiber. 5. The improved polishing according to claim 3, which is at least one inorganic fiber selected from the group of inorganic fibers consisting of stainless steel, copper, aluminum, silicon nitride, silicon carbide, boron, or carbon. Bristles for use. 6. Claim 3, which is an aromatic polyamide fiber made of a polymer having the formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (wherein AR_1 and AR_2 are aromatic groups and n is an integer) Abrasive bristles as described. 7. The improved abrasive bristles of claim 6, wherein the aromatic polyamide fibers are poly-P-benzamide fibers. 8. The improved abrasive bristles of claim 6, wherein the aromatic polyamide fibers are poly-m-benzamide fibers. 9 Claim 6, wherein the aromatic polyamide fiber is poly-(1,4-phenylene terephthalamide) fiber.
Improved abrasive bristles as described in section. 10. Claim 1 which is at least one type of abrasive grain selected from the group of artificial abrasives consisting of fused alumina, silicon carbide, zirconia carbide, nitride, boride, glass, and artificial diamond. improved abrasive bristles. 11 At least one selected from the group of natural abrasives consisting of diamond, corundum, emery, garnet, and soft stone.
The improved abrasive bristles of claim 1 which are seed abrasive grains. 12 Nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, copolymerized nylon containing these; polyethylene terephthalate,
The improved abrasive bristles according to claim 1, wherein the outer layer is composed of at least one thermoplastic polymer selected from the group consisting of polybutylene terephthalate and copolymerized polyester containing these. 13 Outer layer composed of at least one kind of polymer selected from a thermosetting polymer group consisting of phenol resin, melamine resin, urea resin, unsaturated polyester resin, diallyl phthalate resin, epoxy resin, rubber, and polyurethane. An improved abrasive bristles according to claim 1. . 14. The improved abrasive bristles of claim 1, wherein the outer layer contains heat-resistant fibers. 15. The outer layer according to claim 14, which is an outer layer containing at least one type of heat-resistant fiber selected from the group consisting of mineral fibers, inorganic fibers, and aromatic polyamide fibers having a thermal decomposition temperature of 300° C. or higher. Improved abrasive bristles. 16. The improved abrasive bristles according to claim 1, which contain 1 to 40 parts by weight of heat-resistant fibers and 10 to 70 parts by weight of abrasive grains based on 100 parts by weight of the thermoplastic polymer. .