JPH10292218A - Artificial rush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain artificial rush which is quite similar to natural rush in texture, appearance, touch, etc., and which is free of linear expansion (elongation). SOLUTION: This artificial rush 10 is obtained by blending the principal component polyolefin with a synthetic resin which is immiscible with the polyolefin and a filler, and extruding the mixture into a hollow linear member. The hollow linear member is provided on its surface with plural grooves 5 in the extrusion direction. The immiscible synthetic resin includes a synthetic resin which is immiscible with the principal component polyolefin or a synthetic resin with rubbery elasticity. Because of the immiscible synthetic resin, the surface area can be enlarged by means of the micro-fine grooves and the micro- porous voids are formed between the immiscible synthetic resin and the principal component polyolefin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial rush that has a texture, appearance, feel, etc. close to that of a natural rush by increasing the surface area due to fine irregularities, and has no linear expansion (elongation).

[0002]

2. Description of the Related Art Artificial rush, which replaces natural rush, is becoming popular because of its stable supply, uniform quality, and stable price compared to natural ones. Many attempts have been made to provide artificial rushes closer to natural rushes, for example, JP-A-6-26183, JP-A-6-41808, JP-A-6-4180
No. 9, JP-A-7-304106 and many others. JP 6-2618
In JP-A-6-41808, a thermoplastic resin tape is formed by converging and fusing a tape of a thermoplastic resin to form a fusion coating on the surface to form a synthetic resinous rush. What contains an inorganic filler in the body and has an open-cell structure,
Japanese Patent Application Laid-Open No. 6-41809 discloses an artificial rush made of a thermoplastic resin film which is randomly folded and coated with a resin coating to form a linear body.

[0003]

Many of these conventionally proposed artificial rushes have been specified to be very similar to natural rushes, but many of them have an appearance unique to synthetic resin products. In addition, even when touched, the touch is different from that of natural rush. Low linear expansion of natural rush has also been an issue for artificial rush. For example, if you make a tatami table,
If the coefficient of linear expansion of the artificial rush is large, the surface of the tatami mats floats, causing wrinkles and tears. In the conventional artificial rush, studies on this low linear expansion have not been sufficiently added. The present invention has a texture, appearance, feel, etc. close to that of natural rush, and linear expansion.
It aims to provide artificial rushes without (elongation).

[0004]

According to the present invention, there is provided a polyolefin as a main material, and an incompatible synthetic resin which is incompatible with the polyolefin and a filler are blended into the polyolefin and extruded into a hollow linear body. It is an artificial rush. The polyolefin referred to herein is preferably polypropylene or polyethylene which has been frequently used in artificial rush in recent years, and the polypropylene may be a homo-, or a random or block copolymer. Polyethylene is LDPE, L
Both LDPE and HDPE can be used. In some cases, polypropylene alone does not produce the unique texture of rush.
Therefore, it is preferable to mix polyethylene at the same time. In the artificial rush of the present invention, polypropylene is used in an amount of 20 to 80 parts, whereas the blend of polyethylene is preferably 1 to 25 parts.

[0005] The incompatible synthetic resin added to the main material includes polystyrene, polycarbonate, and A which are hardly compatible with the main material.
One or two or more of TPO (polyolefin-based thermoplastic) elastomer, polybutadiene, and EVA having rubber elasticity are blended with BS, polyamide, PET, PBT, and the like, respectively, according to required properties. This means that fine irregularities are formed on the surface of the artificial rush, and the surface area is increased and the rigid resilience and flexibility are simultaneously provided, and the compounding ratio changes the characteristics. The mixing ratio of the incompatible synthetic resin is 10 to 10 in the case of TPO with respect to the mixing ratio of the polyethylene and polypropylene.
60 parts, preferably 15-30, 1 in case of polycarbonate
-20 parts, preferably 3-10 parts. Among the incompatible synthetic resins, in addition to those that are not completely compatible with the main material, those that are partially incompatible and partially soluble in other parts are included.

[0006] Fillers for imparting various properties include calcium carbonate, talc, mica, silica, titanium oxide, alumina, zinc oxide, calcium oxide, magnesium oxide, and hydroxide for matting, rigidity and rebound resilience. Calcium, magnesium hydroxide, zinc hydroxide, basic magnesium carbonate, calcium carbonate, barium carbonate, zinc carbonate, dawsonite, hydrotalcite, calcium sulfate, barium sulfate, stone pipe, clay, activated clay, iron oxide,
Tin oxide, antimony oxide, ferrite, calcium silicate, magnesium silicate, montmorillonite, bentonite, zeolite, sepiolite, imogolite, sericite, glass fiber, glass beads, silica balloon, calcium nitride, boron nitride, silicon nitride, graphite, Carbon fiber, carbon balloon, charcoal powder Various metal powders, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, quartz karaz fiber, Teflon powder, wood powder, pulp, rubber powder Various fillers such as fibrous, needle-like, plate-like, sphere / granular, etc. fillers such as aluminum borate, MOS (trade name) aluminum borate, zonolite, and potassium titanate whisker are used according to the characteristics.

[0007] As the form of the artificial rugged linear body, a foam is most preferable, and it is preferable to extrude into a hollow linear body by adding a foaming agent. By using a foam, it has enlarged fine irregularities, has a large number of microporous spaces, and suppresses linear expansion. In addition, an antistatic agent, a surfactant, an antibacterial agent, a pigment, a dye, and the like are arbitrarily compounded, including an ultraviolet absorber for enhancing weather resistance.

Further, it is preferable to have an anti-stretch material inside to achieve a low coefficient of linear expansion (low stretch elongation). Fibers (especially natural fibers such as cotton and hemp) and metal wires (iron wires) can be used as the anti-stretch material. These can be put into artificial rushes singly or in combination of two or more, or of the same or different types. As the easiest way to put the artificial rush as a core material in the artificial rush, it is preferable to extrude the artificial rush into a linear body and at the same time send an anti-stretch material to include it inside. In addition, an anti-stretch material is inserted into the hollow portion of the extrusion-molded hollow wire.

[0009] The surface of the artificial rush of the present invention can be smooth, if desired, or can be provided with a number of irregularities. The concave and convex strips provided on the surface can have an appearance closest to that of natural rush, depending on the shape of the extrusion nozzle. It is preferable to provide a plurality of uneven strips on the surface of the hollow linear body, that is, 8 to 60, preferably 8 to 40. The term “concave and convex strips” as used herein refers to concavities and convexities oriented on the surface of the hollow linear body in the extrusion direction. The hollow linear body does not necessarily need to be present continuously over the entire area in the longitudinal direction, and may be formed into an irregular line shape intermittently.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1 After blending 45.3 parts of polypropylene, 6.0 parts of polyethylene, 24.5 parts of TPO elastomer, 4.5 parts of polycarbonate, 12.5 parts of calcium carbonate, 5.5 parts of talc, 0.5 part of ultraviolet absorber, 1.0 part of antistatic agent, and 0.3 part of surfactant. , And mixed at 210 ° C.

The molten mixture was extruded from a nozzle having a diameter of 2.5 mm at 210 ° C. to obtain a hollow artificial rush having a cross section shown in FIG. As a result, as shown in FIG. 7, the semi-molten colloidal polycarbonate 2 and the TPO elastomer 3 exist in the form of elongated granules, plates, or granules into the melted polyolefin 1 and are similar to natural rushes due to diffused light reflection and the like. A light brown artificial rush was obtained.

Table 1 shows other examples including Example 1 and a comparative example.

[0013]

[Table 1]

[0014] In the second embodiment, irregularities are provided on the surface of the hollow wire under the same conditions as in the first embodiment. Example 3 includes a blowing agent,
The formulation was changed. In Example 4, a cotton yarn was inserted into the hollow portion of the linear body under the conditions of Example 1. In Example 5, an iron wire was inserted into the hollow portion of the linear body under the conditions of Example 1. In Example 6, a cotton yarn and an iron wire were inserted into the hollow portion of the linear body under the conditions of Example 1. Example 7 used ABS as the incompatible synthetic resin. In Example 8, polystyrene was used as the incompatible synthetic resin. In Example 9, only polypropylene was used as the main polyolefin material. In Example 10, the melt extrusion temperature was increased under the conditions of Example 1. Example 11
Was reduced by the melt extrusion temperature under the conditions of Example 1. The artificial rush obtained in Examples 1 to 11 will be described in detail later,
All have a texture, appearance, feel, etc. close to natural rush,
It was of good quality with low linear expansion (elongation). FIG. 9 (a) shows an enlarged front view and FIG. 9 (b) shows a partially enlarged side view of the artificial rush 11 containing no incompatible synthetic resin of Comparative Example 1.
FIG. 9A is a cross-sectional micrograph (80) corresponding to the direction perpendicular to the axis corresponding to FIG.
FIG. 16 shows an axial surface micrograph corresponding to FIG. 9 (b).
(80x), but the plastic felt strongly and the texture, appearance, feel, etc. did not resemble that of natural rush.

FIG. 1 shows an extruded hollow linear body by a normal circular nozzle. However, according to the first embodiment, fine irregularities are formed on the surface of the linear body. FIG. 7 shows the state by an enlarged view, and FIG. 10 shows a cross-sectional micrograph taken in a direction perpendicular to the axis.
(800 times). Polycarbonate 2, which is an incompatible synthetic resin, is present in the polyolefin main material. FIGS. 2A and 2B show an example in which the shape of the extrusion nozzle is changed from a circular shape to a shape having unevenness, and the nozzle is provided with uneven strips 5 on the surface of artificial rush. FIGS. 3A and 3B show an example in which the foaming cell 4 is formed by a foaming agent. FIG. 11 shows a micrograph (× 80) of the artificial rush of the present invention corresponding to FIG. 3 (a). FIG. 12 shows a micrograph (magnification: 80) corresponding to FIG. 3 (b). FIG. 13 shows a partially enlarged micrograph (at a magnification of 800) of FIG. FIG.
-B shows an enlarged sectional view. FIG. 14 shows a micrograph (at a magnification of 800) of the artificial rush of the present invention corresponding to FIG. In addition to the incompatible synthetic resin in which the polycarbonate 2 and the TPO elastomer 3 are not compatible, a foam cell 4 is seen. Since the foam cell 4 is cooled while forming a microporous space in the polymer, an uneven linear body is formed while maintaining fine particles. A gap is also formed between the incompatible synthetic resin and the polyolefin main material. Due to the light reflection by these, it has a complex appearance, and it is an artificial rush 10 similar to natural rush with glare light reflection. At the same time, the coefficient of linear expansion is reduced.

FIGS. 4 to 6 show an anti-stretch material 6 inside the linear body.
It is a front view of the artificial rush which has a. FIG.
5 is a steel wire (iron wire),
FIG. 6 shows an example in which a cotton yarn and a steel wire are used in combination for the elastic member 6. In each case, the linear expansion coefficient of artificial rush decreases significantly. Table 2 shows the numerical values.

[0017]

[Table 2]

[0018]

According to the present invention, it is possible to provide an artificial rush that has an appearance similar to that of natural rush, has a texture, appearance, and feel similar to those of natural rush, and has no linear expansion (elongation).

[Brief description of the drawings]

1 (a) is an enlarged front view of an artificial rush of the present invention having a hollow structure, and FIG. 1 (b) is a partially enlarged side view.

FIG. 2 (a) is an enlarged front view of an artificial rush having a hollow structure and a surface provided with uneven stripes, and FIG. 2 (b) is a partially enlarged side view.

FIG. 3 (a) is an enlarged front view of an artificial rush having a hollow structure and a foamed structure provided with uneven stripes on the surface, and FIG. 3 (b) is a partially enlarged side view.

FIG. 4 is an enlarged front view of an artificial rush having a stretch-preventing material inside a linear body.

FIG. 5 is an enlarged front view of an artificial rush having an anti-stretch material inside a linear body.

FIG. 6 is an enlarged front view of an artificial rush having a stretch-preventing material inside a linear body.

FIG. 7 is an enlarged sectional view taken along the line AA in FIG. 1 (b).

FIG. 8 is an enlarged sectional view taken along the line BB in FIG. 3 (b).

FIG. 9A is an enlarged front view of a conventional artificial rush having a hollow structure made of polypropylene, and FIG. 9B is a partially enlarged side view.

FIG. 10 is a cross-sectional micrograph (× 800) of the artificial rush of the present invention in a direction perpendicular to the axis.

FIG. 11 is a cross-sectional micrograph (× 80) of the artificial rush of the present invention in a direction perpendicular to the axis.

Fig. 12 Axial surface micrograph of Doujin-made rush (x80)
It is.

FIG. 13 is a partially enlarged micrograph of an artificial rush in a direction perpendicular to the axis.
(800 times).

FIG. 14 is an axial micrograph (800) of the artificial rush of the present invention.
Times).

FIG. 15 is a cross-sectional micrograph (× 80) of a conventional artificial rush in a direction perpendicular to the axis.

FIG. 16 is an axial surface micrograph of a conventional artificial rush (8
0 times).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polyolefin 2 Polycarbonate 3 TPO elastomer 4 Foam cell 5 Concavo-convex strip 6 Anti-stretch material 10 Artificial rush

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B29K 105: 04 (72) Michio Nose 66-4, Nishi-Achi-cho, Kurashiki-shi, Okayama 4 (72) Yoshio Ohara Takasuka, Kurashiki-shi, Okayama 3 of 211

Claims (5)

[Claims] 1. An artificial rush comprising a polyolefin as a main material, an incompatible synthetic resin which is incompatible with the polyolefin, and a filler mixed with the polyolefin, and extruded into a hollow linear body. 2. A polyolefin as a main material, an incompatible synthetic resin which is not compatible with the polyolefin, and a filler are blended into the polyolefin, and extruded into a hollow linear body,
2. The artificial rush of claim 1, wherein said hollow linear body has a plurality of irregularities in the extrusion direction on the surface. 3. The incompatible synthetic resin is a synthetic resin which is hardly compatible with the polyolefin as a main material or a synthetic resin having rubber elasticity. The artificial rush according to claim 1 or 2, wherein a microporous space is formed between the soluble synthetic resin and the main polyolefin. 4. The hollow linear body is extruded by adding a foaming agent, and has an expansion of fine irregularities, a large number of microporous spaces, and a suppressed linear expansion. 3. The artificial rush described in 3. 5. The artificial rush of claim 1, 2, 3 or 4, wherein the linear body has a material for preventing expansion and contraction.