JP3747938B2 - BMC material and molding method - Google Patents

Description

  The present invention relates to a BMC (Bulk Molding Compound) material and a BMC molding method using the same, and more particularly to a BMC material and a molding method for molding a patterned product.

The following methods are known as methods for molding a synthetic resin molded product having a pattern.
(1) Colored ink is printed on the surface of the material, and then put into a mold for compression molding (Japanese Patent Laid-Open No. 60-94319).
(2) A method in which a string-like molding compound is overlaid with a sheet molding compound having a different color from that and heated and pressed (Japanese Patent Publication No. 58-38300).
(3) A method of forming a cloud-like pattern by placing two types of BMCs having different color tones in a mold, heating and pressurizing them, and mixing them at the same time as casting (JP-A-7-241862).
JP-A-60-94319 Japanese Patent Publication No.58-38300 Japanese Patent Laid-Open No. 7-241862

  In the above methods (1) and (2), it is possible to obtain only a molded product in which the pattern is too clear and the artificial feeling is attached.

  In the method of (3) above, a natural pattern-like molded body with blurred pattern borders can be obtained, but what pattern is formed is not known until the mold is opened. There is a problem that a molded product having a pattern with excellent designability cannot be molded at a high yield.

  An object of this invention is to provide the BMC raw material and molding method which can shape | mold the molded article which has the pattern excellent in the designability with high yield.

請 Motomeko 1 ~ BMC material and molding method of 3, molding the BMC shaped bodies of plastic state, into close contact with intervening colorant therebetween, using the BMC material and it formed by thickened Is the law.

  This BMC material is a three-layered material having a colorant layer in a sandwich shape, and an element obtained by cutting this material has a colorant layer exposed on the cut surface in a layered manner.

As described in claim 2 , when the heat-press molding is performed so that the surface where the colorant layer is exposed is applied to the mold, a molded body having a streak pattern in which the colorant layer is elongated is formed.

If a short segment is arranged near the center in the short width direction and a long piece is arranged on the end side in the short width direction as in claim 3, a streak pattern aligned in parallel with the longitudinal direction is formed. Can be formed.

According to the BMC material and the molding method of claims 1 to 3, it is possible to mold a high-quality product in which parallel box-like patterns are formed without a sense of incongruity. According to the molding method of claim 3 , it is possible to mold a product in which the lines are aligned in parallel.

Embodiments of claims 1 and 2 will be described with reference to FIGS.

First, as shown in FIG. 1, a BMC preparation material 9 is poured into a case 8, and a pigment or the like is applied thereon. A colorant 10 is supplied. The BMC compound material is poured onto this again. After thickening this, Remove from source 8. The plate-like thickened body (BMC material) 11 thus obtained is shown in FIG. Cut into pieces 12. A layer of the colorant 10 is exposed at the cut end of the element piece 12. First As shown in FIG. 3, the pieces 12 are arranged so that the cut surface is in contact with the mold 13, and heat-press molding is performed. . As a result, as shown in FIG. 4, a molded body 15 having a streak pattern 14 is obtained.

Although not particularly limited, the following can be used as a prescription example of this BMC.
Unsaturated polyester resin 50-100 parts by weight Styrene monomer 0-30 parts by weight Low shrinkage agent 0-30 parts by weight Polymerization inhibitor 0-0.5 parts by weight Curing agent 0.5-2.0 parts by weight Filler 100-400 Part by weight Internal release agent 2 to 5 parts by weight Thickener 0.5 to 2 parts by weight Glass fiber (preferably about 1.5 to 6 mm in length) 0 to 50 parts by weight This preparation is an example, and acrylic BMC or the like can also be used .

In order to increase the viscosity, heating is usually performed at 30 to 50 ° C. for about 24 to 120 hours.

The increase after thickening material is stored in their airtight plastic bag or the like, is taken out from the bag at the time of molding.

When heating and pressing the thus obtained piece, it is preferable that the temperature is 110 to 150 ° C., the time is 3 to 30 minutes, and the pressure is about ²⁰ to 100 kg / cm ² .

Although all the pieces 12 in FIG. 3 have the same length, pieces 12a and 12b having different lengths may be used as shown in FIG. 5 (embodiment of claim 3 ). In general, when a long plate-like product is formed, the pieces are arranged in the longitudinal direction of the mold. However, since the material flows toward the corner of the cavity at the time of heat and pressure molding, the length of the pieces 12 is uniform. If so, the streak pattern 14 becomes divergent like the molded body 15B of FIG. On the other hand, as shown in FIG. 5, by adopting an element 12 a shorter than the element 12 b on the end side as the element 12 a on the center side in the short width direction, the streak is formed as shown in FIG. The molded body 15A that has become parallel can be molded.

  If the surface of the mold surface is rough, the surface pattern of the product to be obtained is blurred, and if the surface of the mold surface is smooth, the surface pattern of the product to be obtained becomes clear.

Example 1
Examples of claims 1 to 3 for forming a streak-shaped product will be described below.

(1) Preparation of BMC material
Unsaturated polyester resin was prepared as follows to prepare a BMC material. In addition, 4 parts of ivory toner was used instead of the pigment so that the color of the entire BMC was ivory.
85 parts by weight of unsaturated polyester resin (bis)
Low shrinkage agent (polystyrene) 15 parts by weight
Polymerization inhibitor (mono-t-butyl hydroquinone) 0.2 parts by weight
Curing agent (organic peroxide) 1.0 part by weight
150 parts by weight of filler (aluminum hydroxide, average 50um)
Internal release agent (zinc stearate) 5 parts by weight
Thickener (magnesium oxide) 1 part by weight
Glass fiber (1.5mm glass chop) 5 parts by weight
In addition, immediately after the preparation, the preparation had fluidity (1000 to 2000 ps) enough to sag with its own weight .

(2) Manufacture of BMC material (1) After preparing this BMC material, prepare a rectangular box of 100x100x80mm, lay a styrene-impermeable film on it, and put this BMC material in the box Removed until half height.
(2) With the surface almost flattened by flow, a solution prepared by dissolving 10 g of brown pigment in 100 g of unsaturated polyester resin and 100 g of styrene was applied to the upper surface using a brush.
(3) Immediately after the application, the remaining BMC was poured onto it, wrapped with a film, packaged in a box, heated in a 40 ° C. air bath for 3 days to increase the viscosity, and BMC material 11 was obtained.
(4) The obtained BMC material 11 was cut into pieces 12a and 12b, and a 2100 × 600 counter with an apron and a back guard shown in FIG. 7 was formed using the pieces. That is, this long and thin BMC piece was placed on a mold in the state shown in FIG. 5 and press-molded. By controlling the difference in the length of the pieces, the flow pattern finally obtained could be controlled straight to the end. The length of the long element 12b is 35 × 12 × 8 cm, and the dimension of the short element 12a is 30 × 12 × 8 cm.
The molding temperature was 140 ° C., the pressure was 50 kgf / cm ² , and the pressing time was 10 minutes.
(5) The product obtained was an artificial marble-like counter with four flow patterns in parallel up to the end. In addition, the shading of the pattern was spread while fading , resulting in a three-dimensional appearance of the pattern and a unique texture.
(6) This product was cut to a required length, and a hole for attaching a basin was opened in the central part to make a vanity. The same pattern as the surface continued on the cross section of the opening, and there was no sense of incongruity in the hole.

(Example 2 )
Next will be described another embodiment of claim 1, 2 for molding a product of streaky pattern.

(1) Preparation of BMC material BMC was prepared using the same method as in Example 1. The material is a highly transparent bis-unsaturated polyester and a glass frit (average particle size 10 μm) having a refractive index close to the refractive index of the cured product (refractive index 1.545), and an organic peroxide as a curing agent. Two types (tert-butyl peroxy-2-ethyl hexanate, tert-hexyl peroxy-isopropyl monocarbonate) were used in combination. In addition, two parts of white toner were added to obtain a white color.

(2) Manufacture of BMC material (1) In order to form the BMC material obtained in this way into a box shape, it is transferred to a cylindrical ram press container, and the BMC is extruded from a 300 × 60 mm rectangular die to a length of 500 mm. BMC flat plate.
(2) A toner obtained by diluting white toner twice with styrene was spray-coated on the upper surface of the plate. (3) Put another flat plate on this BMC flat plate, put the spray surface in a sandwiched state, wrap it with a styrene impervious film, pack it in a container, and heat it to 40 ° C. To increase the viscosity.
(4) A 1200 × 650 size wash ball integrated counter was molded using the BMC material thus obtained.

  That is, first, after thickening, it was cut on a surface perpendicular to the sandwiched spray application surface and cut into an appropriate size and the number of desired pattern lines so as to be easily charged.

  With the cut surface set to the product surface side, three were arranged in the ball so that a flow pattern line would appear, and further, 1/3 of the total amount was arranged on the faucet fitting mounting surface so that the flow pattern would appear sideways. By adjusting this amount, it is possible to flow the pattern pushed away from the ball in parallel to the end. Moreover, a flow pattern can also be attached to the back guard portion. The heating and pressing conditions are the same as in Example 1.

  The counter thus obtained is a high-quality artificial marble counter with a thin white line flowing in the whole pale white. In addition, since the base resin has a transparent feeling, not only the surface pattern but also the pattern deep in the thickness direction can be seen more, giving it a three-dimensional effect and depth.

It is a cross-sectional view illustrating a method according to an embodiment of the implementation. It is a perspective view which shows the cutting method of a thickened body (BMC raw material). It is a perspective view which shows a shaping | molding method. It is a perspective view of a product. It is a top view which shows the arrangement | sequence of a BMC piece. It is a top view which shows products 15A and 15B. 2 is a perspective view of a counter 20. FIG. 2 is a perspective view of a counter 30. FIG.

Explanation of symbols

11 BMC material 12, 12a, 12b BMC piece 15 product 20, 30 counter

Claims (3)

  A BMC material in which a coloring agent is interposed between BMC plate-like bodies in a plastic state to increase the viscosity. A method of forming a BMC molded body by scraping off the outer surface of the BMC material according to claim 1 and arranging a plurality of pieces obtained by cutting the material into long sides in a mold and heating and pressing. ,
A BMC molding method in which the element is placed in a mold so that the surface where the colorant is exposed contacts the mold surface. The molding method according to claim 2, wherein the mold cavity extends long in one direction, and the pieces are arranged so as to extend in the longitudinal direction of the cavity.
The BMC molding method characterized in that the length of the element disposed near the center in the short width direction of the cavity is shorter than the length of the element disposed on the end side in the short width direction. .

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