JP2008136712A - Method of manufacturing polyester fiber used for brush or writing brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing polyester fiber used for a brush or writing brush, which is capable of easily obtaining the brush or writing brush with excellent application property. <P>SOLUTION: The polyester fiber used for the brush or writing brush, which has a tapered end in the end direction, is subjected to blasting for blowing inorganic particles whose average particle size is 1.0-100 μm to form recesses whose average depth is 0.1-1.0 μm in the surface of the fibers at the end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing a polyester fiber for use in a brush or brush excellent in applying powdery, creamy or liquid cosmetics, aqueous paints, and oily paints.

  It has been known for a long time to make one end of a brush or brush using a synthetic fiber into a tapered shape (conical shape) (Patent Document 1). Is also used for general purposes (Patent Document 2).

However, the surface of the tapered part of the synthetic fiber itself becomes rather smooth by the alkali treatment, so that the supplement of cosmetics and paints is worse than the brush and brush of animal hair, and the texture at the time of application is satisfactory is not. In addition, polyester fibers are poorly wetted with the above-described cosmetics and paints, and are less complementary than good animal hair.
However, on the other hand, it is not desirable to use natural animal hair as a brush or brush hair material due to the problem of nature protection, and it is becoming difficult to obtain it.

Japanese Patent Laid-Open No. 49-047618 JP 2002-058538 A

  This invention is made | formed in view of the said background art, and it aims at providing the manufacturing method of the polyester fiber used for the brush or brush which can obtain easily the brush or brush excellent in applicability | paintability.

  When the present inventors examined, the said objective performed the blast process which sprays the inorganic particle whose average particle diameter is 1.0-100 micrometers to the polyester-type fiber which has a taper-shaped front-end | tip part, and this front-end | tip. It has been found that this can be achieved by a method for producing a polyester fiber used for a brush or brush, characterized in that a recess having an average depth of 0.1 to 1.0 μm is formed on the fiber surface of the part.

  According to the production method of the present invention, it is possible to easily produce a polyester fiber that has a concave portion such as animal hair in a tapered portion and from which a brush or brush excellent in applicability can be obtained.

  The manufacturing method of the polyester fiber used for the brush or brush of the present invention is a manufacturing method in which a polyester fiber having a tapered tip portion in the tip direction is subjected to blasting and a recess is formed on the fiber surface of the tip portion. .

  The polyester fiber used in the above production method is a fiber composed of a polyester monomer hydrolyzed by alkali, preferably polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), or these. A fiber made of a copolymer as a main component is used. Most preferably, it is a fiber made of PBT or a copolymer mainly composed of PBT that has elasticity (elasticity) like animal hair and is easily hydrolyzed. These polyester fibers can contain conventional additives such as heat-resistant agents, weathering agents, flame retardants, bactericides, plasticizers, and colorants, as long as the object of the present invention is not impaired.

The fineness of one fiber used in the present invention is preferably 10 to 1100 dtex, and the fineness of one fiber is more preferably 30 to 400 dtex.
The polyester fiber for brush or brush of the present invention is practically used in the form of a cut bristle cut to a desired length.
The cross-sectional shape is not limited to a round cross section, and can be appropriately selected from an elliptical shape, a polygonal shape, a multi-leaf shape, a hollow shape, and the like depending on the application.
The polyester-based fiber can be tapered at the tip end using alkali, which is a known method.

  The blast treatment used in the present invention is a method for performing surface treatment by causing a blast material to collide with the substrate surface using a blast machine. The blasting process is usually carried out by a dry method, but considering the process of scattering the powder and washing off the powder, it is a clean and useful method to use a slurry in which a blasting material is dispersed in water with a dispersant.

  Inorganic particles are used for the blasting material, and specific examples include alumina, calcium carbonate, titanium oxide, aluminum oxide, barium sulfate, clay, and talc. An inexpensive and easy to handle is alumina.

  The average particle diameter of the inorganic particles is 1.0 to 100 μm. A deep recess is formed by blasting with inorganic particles having such an average particle diameter. The shape of the inorganic particles may be any of a spherical shape, a flake shape, a needle shape, and the like, and is not particularly limited.

  In the blast treatment, it is desirable that the time for spraying the inorganic particles is 0.01 to 10 seconds, preferably 0.01 to 1 second, and the air pressure is 0.1 to 10 MPa, preferably 0.1 to 1 MPa.

  When the production method of the present invention is used, it is necessary that concave portions having an average depth of 0.1 to 1.0 μm, preferably 0.3 to 1.0 μm, are formed on the surface of the polyester fiber. If the average depth is less than 0.1 μm, sufficient supplementary properties cannot be obtained, and if it exceeds 1.0 μm, there is a risk of fiber breakage.

  In the present invention, the average width of the concave portions on the fiber surface is preferably 0.8 to 2.5 μm, more preferably 0.8 to 2.0 μm. In addition to the above-described average depth of the recesses, by setting the above average width, it is possible to obtain a recess shape that is uniformly raised without being affected by the crystal structure of the fiber surface. By adopting such a shape, it is possible to obtain excellent supplementation and texture such as animal hair. From the same viewpoint, the average interval between the concave portions on the fiber surface is preferably 0.5 to 2.5 μm, and more preferably 0.5 to 2.0 μm.

  Having a tapered tip with such irregularities makes it easier to adsorb dirt if used as a toothbrush, and if used as a makeup brush or paint brush, firmly supplements powder cosmetics and paint. Can be obtained, a texture similar to animal hair.

Hereinafter, the present invention will be specifically described with reference to examples.
(1) Shape of concave portion Five fibers were randomly extracted from the fiber bundle, and the cross section of the fibers and the side surface of the fiber 3 mm below the tip were observed by SEM (scanning electron microscope). In the cross section of the fiber shown in FIG. 1, the depth a of the recess in the fiber internal direction was measured, and the average value was obtained. In addition, on the side surface of the fiber 3 mm below the tip shown in FIG. 2, the width b of the recesses and the interval c of the recesses are measured for the range of the length 30 μm in the fiber axis direction × fiber diameter, and the average value is obtained. It was. Further, the same measurement is performed for each of the five fibers to obtain an average value, and further, average values of a, b, and c (average depth a, average width b, average interval c) of the five fibers are calculated. did.
(2) Amount of foundation adhesion The bottom of the fiber bundle was held and rubbed against the powder foundation up to 1 cm from the tip. This was repeated three times and the amount of powdery foundation deposited was measured.

[Example 1]
As a polyester fiber, a bundle of 100 dtex PBT fibers (manufactured by Teijin Nestex) was bundled and cut to a length of 5 cm, treated with a 5% aqueous solution of sodium hydroxide at 100 ° C. for 100 minutes, and the tip tapered. What was made into the shape was used.
The fiber bundle is fixed to a flat plate, and a slurry in which alumina particles having a particle size of 6.7 μm are dispersed in 14% by weight of water is discharged from a slit of 320 mm × 1 mm with an air pressure of 0.25 MPa to be processed into the fiber bundle. Spraying was performed at a time of 0.05 seconds, and wet blasting was performed. In order to treat the entire fiber bundle, the fiber bundle was further removed from the flat plate and fixed again with the opposite surface of the fiber bundle facing up, and this surface was also blasted under the same conditions. The results are shown in Table 1.

[Examples 2 to 4]
Blasting was performed in the same manner as in Example 1 except that the particle size, air pressure, and processing time of the alumina particles were changed as shown in Table 1. The results are shown in Table 1.

[Comparative Example 1]
In the same manner as in Example 1, a PBT fiber bundle having a tapered tip was used. The fiber bundle was not subjected to plasma treatment. The results are shown in Table 1.

  According to the present invention, it is possible to easily produce a polyester fiber from which a polyester fiber that can be used for a brush or brush excellent in applicability can be easily obtained by a clean method using a blast treatment. In addition, the polyester fiber obtained by the present invention has excellent complementarity and good texture when used, and can be widely used for toothbrushes, makeup brushes, makeup brushes, paint brushes, and the like.

It is the schematic which shows an example of the cross section of the polyester-type fiber of this invention. It is the schematic which shows an example of the side surface of the polyester fiber of this invention.

Explanation of symbols

a. Depth of recess b. Width of recess c. Recess spacing

Claims (7)

  Blasting treatment is performed by spraying inorganic particles having an average particle diameter of 1.0 to 100 μm on a polyester fiber having a tapered tip portion in the tip direction, and an average depth is 0.1 to the fiber surface of the tip portion. A method for producing a polyester fiber for use in a brush or brush, wherein a 1.0 μm recess is formed.   The method for producing a polyester fiber for brush or brush according to claim 1, wherein the average width of the concave portion on the fiber surface is 0.8 to 2.5 µm.   The method for producing a polyester fiber for brush or brush according to claim 1 or 2, wherein an average interval of the concave portions on the fiber surface is 0.5 to 2.5 µm.   The production of the polyester fiber for brush or brush according to any one of claims 1 to 3, wherein in the blast treatment, the time for spraying the inorganic particles is 0.01 to 10 seconds and the air pressure is 0.1 to 10 MPa. Method.   The method for producing a polyester fiber for brush or brush according to any one of claims 1 to 4, wherein when spraying the inorganic particles in the blast treatment, the inorganic particles are sprayed as a slurry dispersed in water.   The brush using the polyester-type fiber obtained by the manufacturing method in any one of Claims 1-5.   The brush using the polyester fiber obtained by the manufacturing method in any one of Claims 1-5.

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