JPH11333901A - Shrinkage preventing material and resin molding using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve abrasion resistance and to obtain a good shrinkage preventing effect stably by forming a fusion layer specified with respect to one-directional abrasion load on the outer periphery of a core wire of a metal wire. SOLUTION: This shrinkage preventing material 1 is constituted from a core wire 2 of a metal wire of a circular cross section and a fusion layer 3 of 400-700 gf one-directional abrasion resistant load (JIS C 3003) formed on the outer periphery of the core wire 2. The fusion layer 3 is formed by a process in which a heat-fusion varnish in which a thermoplastic resin is dissolved or dispersed with an additive in a solvent and the viscosity of which is adjusted appropriately is applied on the outer periphery of the core wire 2 and baked into a semi-cured state to obtain the application layer having 400-700 gf in one-directional abrasion resistant load. When a resin to be coated is a polyvinyl chloride resin or a polyamide resin, a polyester resin varnish of about 140 deg.C softening temperature is used preferably as the heat-fusion vanish.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shrink-preventing material used for various molding materials for automobiles, glass run for doors, beating material for window frames of general buildings, and a resin molded article using the same.

[0002]

2. Description of the Related Art Conventionally, a molten resin, such as an automobile molding, a glass run of a door part, a window frame beat of a general building, and the like, is continuously extruded into a required cross-sectional shape through an extrusion die, and cooled and solidified to be formed. In resin extrusion molded products, to prevent shrinkage when the molten resin is cooled and solidified,
The embedding of a metal wire has been performed. When embedding, the metal wire is first inserted into the adhesive application device to attach the adhesive to the outer periphery, and then the metal wire to which the adhesive has been applied is introduced into the extruder to extrude the resin to the outer periphery. Coating methods are commonly used.

However, in such a method, it is necessary to install an adhesive applying device before the extruding device, and there is a problem that the process management becomes complicated.

[0004] To cope with this problem, a shrink-preventing material (reinforcing material) has been developed in which a heat-sealing varnish is previously applied to the surface of a metal wire and baked to a semi-cured state to provide a heat-sealing layer. I have.

According to this shrinkage preventive material, the fusion layer is once melted by heat during resin extrusion, then cooled together with the resin and solidified integrally, so that it is necessary to install an adhesive coating apparatus before the extrusion apparatus. Can be eliminated.

[0006]

By the way, such a shrinkage preventive material, like a conventional metal wire, is once wound around a bobbin or the like, then conveyed, and then handled again from the bobbin. Therefore, it is required to have excellent mechanical properties that can withstand such handling, particularly excellent wear resistance.

However, in the past, the fusion layer had to be selected from materials and forming conditions mainly based on the adhesiveness to a resin or a metal wire to be coated thereon. Adhesive strength was not obtained, and the effect of preventing shrinkage was sometimes insufficient.

The present invention has been made in view of the above-mentioned conventional problems, and has a good abrasion resistance and a stable anti-shrinkage effect which can be stably obtained by handling in the same manner as a conventional metal wire. It is an object to provide a material and a resin molded article using the same.

[0009]

The anti-shrinkage material of the present invention comprises:
As set forth in claim 1, in the anti-shrink material having a fusion layer provided on the outer periphery of a core wire made of a metal wire, the unidirectional wear resistance load (JIS C 3003) of the fusion layer is 400 gf to 700 gf. It is characterized by the following.

[0010] Here, the metal lines are as described in claim 2, tensile strength is desirably ^{1000N / mm 2 ~3000N / mm 2} .

[0011] The resin molded article of the present invention is characterized in that the shrinkage preventing material is embedded therein.

The anti-shrinkage material of the present invention is provided with a fused layer having excellent wear resistance, so that the fused layer does not wear when the bobbin is wound up or unwound, and such abrasion is caused. It is possible to prevent a reduction in the resulting adhesive force and a reduction in the effect of preventing shrinkage. Further, in the resin molded article of the present invention, since such an anti-shrinkage material having excellent abrasion resistance is used, shrinkage at the time of molding is reliably prevented, and quality improvement and stabilization can be achieved. it can.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of the shrinkage preventing material 1 of the present invention.

As shown in FIG. 1, this anti-shrinkage material 1
A core wire 2 made of a metal wire with a circular cross section and a one-way abrasion resistance load (JIS C 3003) provided on the outer circumference thereof are 400 gf to 700 gf.
It is composed of a fusion layer 3 of gf.

The metal wire constituting the core wire 2 has a straightness and a high tensile strength such as, for example, iron or its alloy wire, stainless steel wire, phosphor bronze wire, nickel silver wire or brass wire.
Use of the metal wire 1000N / mm ² ~3000N / mm ² is preferred. Here, straightness means that the distance between both ends of the metal wire when the metal wire having a length of 1 m is vertically suspended is 990 mm or more. In addition, since iron and its alloy are easily oxidized in the air and become brittle, when using them, it is desirable to apply plating to the surface by brass plating, zinc plating or the like.

In the present invention, the core wire 2 is not limited to a metal wire having a circular cross section as in this example, but may be constituted by a rectangular wire or any other cross sectional shape. A stranded wire structure in which a plurality of wires are stranded may be used. Furthermore, in order to improve the adhesiveness with the resin to be coated, the surface of the metal wire may be roughened, or a wavy process may be performed in the longitudinal direction.

The fusion layer 3 is formed by applying a thermal fusion varnish prepared by dissolving or dispersing a thermoplastic resin in a solvent together with other additives to a suitable viscosity on the outer periphery of the core wire 2. Unidirectional wear resistance load (JIS C 3003) is 400gf ~ 7
It is formed by baking in a semi-cured state so as to be 00 gf. Here, if the unidirectional wear resistance load is less than 400 gf,
The effect of the present invention cannot be sufficiently obtained. That is, when the film is wound around a bobbin, the surface is worn and the adhesiveness to the resin to be coated is impaired, and the effect of preventing shrinkage is reduced.

The fusion layer 3 thus formed is non-tacky at room temperature, and melts again when heated to become adhesive.

The heat-sealing varnish is appropriately selected depending on the type of the core wire and the resin to be coated, the workability of coating and baking, the uniformity of the coating layer, and the like.
That is, a material that melts at a temperature lower than the melting temperature is used. Specifically, for example, when the coating resin is a polyvinyl chloride resin or a nylon resin, the softening temperature is about 140 ° C.
It is preferable to use a polyester resin varnish of
When the coating resin is a resin having relatively few polar groups such as a polyolefin resin, a polyester resin having 3 to 50 hydroxyl groups in one molecule and a diisocyanate compound and / or
Alternatively, it is preferable to use a heat fusion varnish mixed with a triisocyanate compound, or a heat fusion varnish using a polar polymer obtained by grafting a small amount of maleic anhydride to a polyolefin. The fusion layer and the resin, which are melted at the extrusion temperature of the coating resin, are cooled and solidified integrally, thereby firmly bonding the core wire and the resin.

The anti-shrinkage material having such a structure has a unidirectional abrasion resistance load (JIS C 3003) of 400 gf to 700 gf.
Is provided, the surface does not wear even when handled in the same manner as a conventional metal wire, and adheres well to the resin to be coated to function as an anti-shrink material. It can be fully demonstrated.

FIG. 2 is a perspective view showing an example of a window molding for an automobile using the anti-shrinkage material 1 having the above-described structure. The window molding is formed in a resin 4 such as a polyvinyl chloride resin extruded into a predetermined sectional shape. An anti-shrinkage material 1 is embedded, and a core wire 2 and a resin 4 are formed by a fusion layer 3 provided on the surface of the anti-shrinkage material 1.
And are glued.

Such a window molding is formed by extruding the resin 4 on the outer periphery of the window molding while introducing the anti-shrinkage material 1 into the extruder. However, the fusion layer 3 is almost worn by the previous handling. Core wire 2
And the resin 4 are bonded well, and the resin 4 shrinks in the longitudinal direction.
Expansion is sufficiently suppressed.

The shrinkage preventing material 1 embedded in the resin 4 is not limited to one as shown in this example, and a plurality of anti-shrinkage materials may be embedded.

[0025]

EXAMPLES Examples of the present invention will be described below. Examples 1 to 6 On a brass wire having a diameter of 0.40 mm (tensile strength 1000 N / mm ² ), a polyester resin varnish (trade name: TCVPA, manufactured by Toku Paint Co., Ltd.)
(Softening temperature 140 ° C) and baking under various conditions.
And the number of reciprocating wear resistance at a load of 220 g (JI
A fused layer having a thickness of 16 μm was formed using S3003 (the same applies hereinafter), and each of them was once wound on a bobbin.

Then, the anti-shrinkage material obtained from each bobbin was drawn out, and the outer periphery thereof was extruded and coated with a polyvinyl chloride resin while being introduced into an extruder to produce an automobile window molding as shown in FIG.

With respect to each of the obtained window moldings, the adhesive force between the anti-shrinkage material and the polyvinyl chloride resin coating was measured by a drawing method. The results are shown in the lower column of Table 1.

Examples 7 to 9 A brass wire having a diameter of 0.08 mm was stranded on seven stranded core wires.
The same polyester resin varnish as in the above example was applied and baked under various conditions to obtain a unidirectional abrasion resistance load as shown in Table 1 and a 16 μm reciprocal wear resistance at a load of 220 g ° C.
A fused layer having a thickness was formed, and each was once wound around a bobbin.

Next, the anti-shrinkage material obtained from each bobbin was drawn out, respectively, and introduced into an extruder while extrusion-coating the outer periphery thereof with a polyvinyl chloride resin to produce an automobile window molding as shown in FIG.

With respect to each of the obtained window moldings, the adhesive strength between the anti-shrinkage material and the polyvinyl chloride resin coating was measured in the same manner as in the above example. The results are shown in the lower column of Table 1. In addition, for the purpose of comparison with the present invention, an example in which a shrinkage preventing material was manufactured under the same conditions as in Examples 1 to 6 above except that a fused layer having a unidirectional wear resistance of less than 100 gf was formed. Was evaluated in the same manner as in the examples. The results are shown in Table 1 as a comparative example.

[0031]

[Table 1] As is clear from Table 1, the window molding manufactured using the anti-shrinkage material according to the present invention has excellent adhesion between the anti-shrinkage material and the polyvinyl chloride resin coating, and the function of the anti-shrinkage material is high. It was confirmed that it was fully demonstrated.

[0032]

As described above, since the anti-shrinkage material of the present invention has a fused layer excellent in abrasion resistance, it can exhibit a stable anti-shrinkage effect. It is possible to stably obtain a high-quality resin molded article without any.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of a shrinkage preventing material of the present invention.

FIG. 2 is a perspective view showing an example of the resin molded article of the present invention using the anti-shrinkage material shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Shrink prevention material 2 ... Core wire 3 ... Fusion layer 4 ... Resin

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seinosuke Mizuno 1-8-8 Kameido, Koto-ku, Tokyo Inside Nippon Pray Co., Ltd. (72) Inventor Yoshiyuki Nishi 1-8-8 Kameido, Koto-ku, Tokyo No. Japan Privilege Co., Ltd.

Claims (3)

[Claims] An anti-shrink material comprising a metal wire and a fusion layer provided around the core wire, wherein the unidirectional wear resistance load (JIS C 3003) of the fusion layer is 400 gf.
An anti-shrink material having a weight of up to 700 gf. 2. A shrinkage prevention material according to claim 1, wherein the shrinkage prevention material, characterized in that tensile strength of the metal wire is ^{1000N / mm 2 ~3000N / mm 2} . 3. A resin molded article having the shrinkage preventing material according to claim 1 embedded therein.