JP2007000997A - Flexible and antistatic nano diamond grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible diamond grinder for dressing a surface of a metal or resin product into a smooth and lustrous surface. <P>SOLUTION: Nano-sized diamond is soaked and fixed to a flexible fiber, a plastic mold, a sponge or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention provides a surface that is shaped from a normal industrial material such as metal or resin, or a surface coated with a paint varnish composition, etc. on the surface, polishing by flattening the end face, and providing flexibility to improve gloss. In particular, the present invention relates to a nanodiamond polished article that is flexible and antistatic so that peripheral fine particles and abrasive particles are less likely to adhere to a polished product, and a polished material is finished beautifully.

Technical background

Conventionally, there are many diamond abrasive cloth sheets as abrasives, but generally, abrasive cloth sheets that are generally inert and have a low affinity and that use diamonds and lack fine bending and flexibility are known.

However, the abrasive cloth sheet is a base cloth provided with an abrasive layer of abrasive particles and a binder, so that the abrasive particles are easy to fall off, and the entire surface of the abrasive layer has few irregularities, and the fallen particles and surrounding floating fine particles There is a drawback that particles and polishing scraps are likely to be attached to the material to be polished. Further, there is a drawback that the material to be polished is easily damaged when fine bending and flexibility are insufficient.

Therefore, the present invention has been made in order to solve the above-mentioned problems as well as polishing properties. The purpose is to improve glossiness and prevent the abrasive particles in the polishing layer from falling off, and to have anti-static properties and a fine irregular surface of the abrasive on the surface. It is providing the abrasive | polishing thing which has property.

In order to solve the above-described problems, the abrasive according to the present invention is an abrasive having an abrasive layer on a constituent surface of a flexible substrate such as cotton, yarn, woven fabric, knitted fabric, nonwoven fabric, and sponge. The layer is treated with an aqueous solution or suspension dispersion composed of a polishing layer composition containing nanodiamond abrasive particles including a binder having a functional group, and is fixed to the base fabric constituting surface. According to the present invention, the abrasive particles in the polishing layer are less likely to fall off by imparting and improving the gloss, and the surface has a fine uneven surface, so that the material to be polished is hard to be damaged, and the floating particles are attached by static electricity after polishing. An abrasive that is difficult to perform is provided.

Abrasives according to the present invention are water-dispersible polymer emulsions such as acrylic, vinyl acetate, water-based urethane, rubber polymer and other water-soluble emulsions that are equivalent to sizing treatment in textile processes in the textile industry. As the polymer, acrylic, PVA, other components such as starch, CMC, sodium alginate, glue, gelatin and the like, or a mixture thereof can be used. According to the present invention, a strong polishing layer is obtained, and an abrasive is provided that is less likely to drop off abrasive particles, is imparted with antistatic properties, is flexible, and the material to be polished is not easily damaged or soiled. The abrasive according to the present invention is such that the binder contains at least one polymer or a combination of polymers typified by synthetic PVA, acrylic or natural CMC, gelatin and the like.

In the abrasive according to the invention, the abrasive particles are based on nanodiamond, and the other may be used in combination. ADVANTAGE OF THE INVENTION According to this invention, an abrasive | polishing thing preferable for grind | polishing the coating surface of a resin molded product or a coating material as a to-be-polished material is provided. ADVANTAGE OF THE INVENTION According to this invention, the abrasive | polishing thing which the surface of a grinding | polishing layer has a fine uneven | corrugated surface, an abrasive particle cannot fall easily, and a to-be-polished material is hard to be damaged and provided is provided.

In the method for producing a polished article according to the invention, the polishing cloth is dipped in an aqueous dispersion treatment liquid of the polishing layer composition to be dehydrated, dried and fixed. ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the abrasives which can be manufactured easily with the existing conventional equipment is provided.

In the present invention, the nano-diamond polishing object can be applied to the flat surface, curved surface, and end surface of the object to be polished due to the flexibility of the polishing body, improving the surface gloss by polishing, and having a function of preventing the generation of static electricity during the polishing process. No auxiliary additives are required and the work is simplified, and there is no residual adhesion of floating particles around the work, and gloss is increased. It was shown to improve.

Embodiments of the present invention will be described in detail.

The base material woven fabric, knitted fabric, non-woven fabric, and their precursors such as cotton, yarn, and sponge materials have mechanical strength that can withstand polishing operations, chemical resistance and solvent resistance that can withstand abrasive lubricants. If there is heat resistance, dimensional stability, etc., materials according to the application can be applied. For example, these are cotton, wool, silk, artificial fibers, synthetic fibers, non-woven resin fibers and spur tones, and resin sponges in fiber form. Polyester resins such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66 are used as resin fibers. Resin, polyolefin resin such as polyethylene and polypropylene, acrylic resin such as polyacrylonitrile, and imide resin, and sponge includes urethane resin.

In some cases, nonionic surfactants, anionic surfactants, cationic surfactants, etc. can be used in combination with these base materials to prevent electrification, and flexible fine-tuning softener treatment is also possible. is there.

Polishing substrates include textiles such as woven fabrics, knitted fabrics, and non-woven fabrics, including cotton, wool, silk, synthetic fibers such as PET, nylon, vinylon, acrylic, imide, and mixed fibers, and other industrial fibers such as polyolefin and PE. Urethane is preferably used for the sponge.

As the abrasive particles, there are many diamonds and nanodiamonds produced industrially, but the nanodiamond applied to the present invention is a surface activity produced according to Japanese Patent Application Laid-Open No. 15-146637. Affinity-dispersed nanodiamond aqueous dispersion suspensions are used, and powdered nanodiamonds are also manufactured according to Japanese Patent Laid-Open No. 15-146637.

The size of fine particles as water-dispersed nanodiamonds is an average particle size of 2000-0 nm in terms of a spherical shape of an elliptical shape measured by a light scattering method or the like. May also be included. The particle diameter of the abrasive particles of nanodiamond as powder is in the range of 0.005 μm to 6 μm in terms of average particle diameter.

In addition to nanodiamonds when applied as a flexible abrasive, halide salts, alumina, silica, zirconia, cerium, other metal oxides and ceramic powders may be added in combination. In addition, when a nano-diamond abrasive is used as a polishing pad material, these can be further used as abrasive particles in the polishing part. A normal ultrasonic disperser or the like is applied to the water dispersion of the powdered nanodiamond.

(Comparative Example) There are many ordinary diamond polishing cloths, but since they generally lack fine bending and flexibility, they are practically difficult to use for polishing resin surfaces, painted surfaces, and polishing to improve glossiness. Therefore, in order to further improve the glossiness of these surfaces, it is usual to treat them with an appropriate ordinary flexible fiber or sponge together with appropriate moisture and a lubricating abrasive to perform incidental cleaning after the treatment. .

Commercially available wool cotton, woven fabrics and knitted fabrics, silk knitted fabrics, synthetic nylon knitted fabrics, and acrylic felt fabrics are used as the substrate. Nanodiamonds manufactured according to Japanese Patent Laid-Open No. 15-143777 are 3.8% aqueous dispersions having a particle size of 0.2 μm to 0.5 μm, with a concentration of 0.8 g / l and CMC of 0.4 g / l, respectively. Substrate is immersed in a water bath with a liquid ratio of 1:50, treated at 90 ° C. and pH 4.5 for 30 minutes, then lightly washed with water, dehydrated, and dried to obtain a flexible polished article that is difficult to be polished and stained. The surface was polished and glossed.

The gloss before and after polishing of the coated surface was measured with a woolen woven fabric and nylon knitted fabric of this processed product. Glossiness is measured at a measurement angle of 60 degrees, and the measuring instrument is measured by Nippon Denshoku Kogyo Gloss Meter VG2000. The paint surface is made of acrylic water-based paint, Rock Paint Co., Ltd. (3 Himejima, Yodogawa-ku, Osaka City). The glossiness was 29 before polishing and 36 after polishing when the glass surface with a refractive index of 1.567 was taken as 100% with respect to the chocolate color of the paint paint Unilock made of -1-47). Similarly, it was 98 before polishing and 97 after polishing with a slight difference to the chocolate color of the lacquer spray of the company's nitrocellulose / acrylic solvent-based paint. With a transparent resin PS plate, the appearance was better visually but it was difficult to measure. Both Mg and Al plates can be polished, and in any case, no adhesion of suspended fine particles due to static electricity after the treatment was observed.

The nanodiamond is treated under the same conditions as in Example 1 after soaking at room temperature in an aqueous solution containing 0.5 g / l CMC as a pretreatment for synthetic polyester ultrafine fiber woven fabric as a basic material and urethane-based sponge. A polished product was obtained, and the resin surface and the painted surface were polished and given gloss. On the painted surface of the water-based paint as in Example 1, an effect of improving gloss after polishing was observed.

Nano-diamond is a powder produced in accordance with Japanese Patent Laid-Open No. 15-143777, with a particle size of 0.2 μm, and a temperature of 50 ° C. under the same conditions as in Example 1. For 30 minutes, treated with an immersion bath having a nanodiamond concentration of 0.01%, dehydrated and dried to obtain a polished product of Example 3, and the resin surface and painted surface were polished to give gloss. In particular, there was no adhesion of airborne particles due to static electricity after polishing.

With normal flexible fibers and sponges, there is also adhesion of fine particles after polishing in combination with a lubricating abrasive, etc., so we compared the generation of static electricity with this test sample. Electrostatic generation voltage 3800 by half-life measurement under JIS-L-1094 20 degrees C x RH 40% and friction band voltage measurement by JIS-L-1094 20 degrees C x RH 40%, respectively. The half-life of the bolt is 0.43 seconds for the cotton fabric of this example 3 and 14.3 seconds for the untreated cotton fabric, which is a significant antistatic effect on the cotton fabric of this example 3. Showed that there is. This indicates that the nanodiamond to the polished article of the present invention has an effect of preventing static electricity generation together with the polishing effect.
Therefore, it was possible to obtain an antistatic effect by fixing the cotton fabric with nanodiamonds of this test sample fixed on the surface of the roller and bringing it into contact with a resin film that also runs for polishing and cleaning.
When using these flexible nano-diamond abrasives, depending on the purpose and conditions, they can be used alone or laminated or fixed to other paper or woven sheets, or fixed to static or dynamic parts. That can be applied

Nano-diamond for cotton and wool woven fabric as a base material is a powder produced in accordance with Japanese Patent Laid-Open No. 15-143777, having a particle diameter of 2 μm to 4 μm, and further, alumina S-229IJ of USA SASOL Co., Ltd. Each of the mixtures at −40 was ultrasonically dispersed to obtain a concentration treatment bath of 0.8 g / l, and the concentration of the water-dispersed nanodiamond of Example 1 was 0.4 g / l. A polished product of Example 3 was obtained under the same conditions, and the resin surface and the painted surface were polished to give gloss. In addition, adhesion of suspended fine particles due to static electricity after polishing was not observed.

Industrial applicability

The flexible antistatic nanodiamond polishing body of the present invention is made by a polishing process accompanied by simplification of labor saving on plane, curved surface, and end face of many material product forms because of antistatic property and polishing function. It is considered that the surface gloss is further imparted to improve the appearance quality and the work productivity is improved.

Claims (4)

A nano-diamond polished article characterized by being flexible and having antistatic properties, and a method for producing the same. A nano-diamond polished article characterized by using as a substrate a textile spun and non-woven aggregate, a flexible plastic molding, and a sponge. A nano-diamond polishing product, characterized in that an aqueous dispersion or powder of nano-diamond produced from a range of 100 Nm-3 μm is used as abrasive particles. The processing apparatus which uses the abrasive body of the said Claim 2 and 3 as a main function member.