JP3555294B2 - BMC material and molding method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
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.
[0002]
[Prior art]
As a molding method of a synthetic resin molded article having a pattern, the following method is known.
(1) A colored ink is printed on the surface of a material, and then charged into a mold for compression molding (Japanese Patent Application Laid-Open No. Sho 60-94319).
(2) A method in which a string-shaped molding compound is overlapped with a sheet molding compound having a different color from that of the string-shaped molding compound, and is heated and pressed (JP-B-58-38300).
(3) A method in which two types of BMCs having different color tones are arranged in a mold, heated and pressurized and mixed simultaneously with casting to form a cloud-like pattern (Japanese Patent Application Laid-Open No. Hei 7-241862).
[0003]
[Problems to be solved by the invention]
According to the above methods (1) and (2) , only a molded article having a pattern that is too clear and has an artificial feeling can be obtained.
[0004]
In the method of the above (3) , the pattern boundary is blurred, a natural pattern-like molded body is obtained, but what kind of pattern is formed is not known until the mold is opened. In addition, there is a problem that a molded article having a pattern having excellent design cannot be molded at a high yield.
[0005]
An object of the present invention is to provide a BMC material and a molding method capable of molding a molded article having a pattern having excellent design properties with a high yield.
[0006]
[Means for Solving the Problems]
The BMC material and the molding method according to claims 1 to 3, wherein a colorant is adhered to the outer surface of the BMC mass in a plastic state, a plurality of the masses are brought into close contact with each other, and the BMC material obtained by thickening is used. It is a molding method.
[0007]
In this BMC material, a coloring agent such as a pigment is adhered to the outer surface of a lump such as a dumpling, and these are adhered to each other. When this BMC material is cut, a pattern derived from the colorant is exposed in a mesh on the cut surface.
[0008]
Therefore, as described in claim 3, by molding the BMC material having the mesh pattern by heating and pressing with a mold, a molded article having a mesh pattern in which the mesh is spread two-dimensionally is formed. .
[0009]
In addition, by making the BMC material into a rectangular parallelepiped as in claim 2, material loss at the time of shaving is reduced, and a large number of pieces of standard dimensions can be cut out .
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the BMC material and the molding method according to claims 1 to 3 will be described with reference to FIGS.
[0011]
First, as shown in FIG. 1, a BMC material is rolled into a dumpling shape, a colorant such as a pigment is applied to the outer surface thereof, and the dumpling-like lump 1 is sequentially packed in a box (container) 2. Until the lumps are thickened, the lumps 1 flow and deform so as to fill the gaps between the lumps 1 and adhere to each other.
[0012]
Next, the material is thickened to form a rectangular parallelepiped raw material 3, and at least one outer surface thereof is cut so as to be thinly cut off, and cut into an appropriate size to form a piece 4. A net-like pattern derived from the coloring agent clearly appears in a thin line shape at the cut end of the element. Note that the outer surface may be cut off after cutting, or the outer surface may be cut off after being cut off.
[0013]
As shown in FIG. 3, the element piece 4 is placed in a mold 5 and molded by heating and pressing. As a result, as shown in FIG. 4, a so-called onyx-like molded product 6 in which the mesh shape is expanded is formed.
[0014]
Although not particularly limited, the following formulation can be used as a formulation example of the BMC.
Unsaturated polyester resin 50 to 100 parts by weight Styrene monomer 0 to 30 parts by weight Low shrinkage agent 0 to 30 parts by weight Polymerization inhibitor 0 to 0.5 part by weight Curing agent 0.5 to 2.0 parts by weight Filler 100 to 400 Parts 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 Note that this preparation is an example, BMC or the like can also be used.
[0015]
The dumpling-like lump 1 may be obtained by extruding a predetermined amount of material by hand or the like, but extruding the material into a rod shape, cutting the extruded product to an appropriate length, and rounding as necessary. There may be. The size of the lump 1 may be uniform, but may be uneven. By selecting the size and size distribution of the lump 1, the size of the mesh of the mesh pattern of the obtained molded product can be adjusted. Generally, the size of one lump is preferably 50 to 500 g, particularly preferably 100 to 200 g.
[0016]
A pigment is suitable as the colorant, and is attached to the outer surface of the lump 1 by directly spraying the powder on the lump 1 or dispersing the powder in a solvent and brush-painting the lump. The colorant may be applied to the entire surface of the lump 1 or may be applied partially.
[0017]
In order to increase the viscosity of the aggregated mass 1 that has been brought into close contact with each other, the mass is generally heated at 30 to 50 ° C. for about 24 to 120 hr.
[0018]
The material after the thickening is stored in an air-tight bag such as vinyl, and is taken out of the bag at the time of molding, and cut and scraped off on the outer surface.
[0019]
When heating and pressing the thus obtained element, it is preferable that the temperature is 110 to 150 ° C., the time is 3 to 30 min, and the pressure is about ²⁰ to 100 kg / cm ² .
[0020]
Contact name when sober mold surface is rough, the surface pattern obtained product becomes blurred shape and sober mold surface is smooth, the surface pattern obtained product becomes clear.
[0021]
【Example】
(Example 1)
An example of a method for forming a molded article having an onyx pattern according to the method of claims 1 to 3 will be described.
[0022]
(1) Formulation of BMC material A BMC formulation having the following formulation was prepared.
Unsaturated polyester resin (bis-based) 85 parts by weight 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 Internal release agent (zinc stearate) 5 parts by weight Thickener (magnesium oxide) 1 part by weight Glass fiber (1.5 mm glass chop) 5 parts by weight In addition, immediately after mixing The formulation had a flowability (1000-2000 ps) of its own weight.
[0023]
(2) Production of BMC material (1) The BMC was taken out of the container little by little, and made into a dumpling-like mass (hereinafter referred to as dumpling) having a size (about 500 g) large enough to fit with both hands. Due to the fluidity of the BMC, this dumpling will collapse flat while being held by hand. As a result, the shape becomes irregular, and the irregularity is one of the factors that give a natural stone-like texture after molding.
(2) The same powder pigment as in (1) and (3) was applied to the surface of this dumpling by hand. The amount was an appropriate amount that allowed the color to be seen, and the amount that was rubbed by hand, just like sprinkling salt on the surface of the rice ball (average of 0.5 g per dumpling).
(3) The dumpling-like BMC whose surface was colored in this way was placed in a container of 500 × 300 mm size. In addition, about 8 to 15 dumplings were put in one box. After stacking up to a height of about 150 mm, the containers were packed together with the bags.
There were gaps between the dumplings at first, but the gaps were filled by the fluidity and weight of the dumplings, and the dumplings were in close contact.
(4) The BMC mass thus obtained was heated in a 40 ° C. air bath for 3 days to increase the viscosity. After thickening, the fluidity was completely lost, and even when taken out of the container, it became a rectangular parallelepiped BMC material.
[0024]
(3) Cutting and molding of BMC material (1) The BMC material was taken out of the bag and cut into four rectangular parallelepipeds to obtain pieces. The cross section contains the colorant attached to the dumplings in an uneven network. Further, the surface other than the cross section was scraped off to obtain a pattern surface similar to the cross section.
(2) A flat counter 20 of 2100 × 600 mm size shown in FIG. 5 was formed using this BMC piece. Here, 21 indicates a back guard, and 22 indicates an apron.
(3) The cut piece was charged into the mold while the cut surface was on the product side and the pattern to be enlarged after the press and the amount to be washed away were considered. In this example, it was placed on the mold side by side the fragment in a horizontal row.
(4) A product having a thickness of 10 mm was obtained at a molding temperature of 140 ° C., a pressure of 50 kgf / cm ² , and a pressing time of 10 minutes.
(5) The product had a net-like faint pattern 23 on the entire surface, and a natural marble-like pattern with uneven thickness, shading, etc. was obtained. In addition, despite the charge being divided, the continuity and discontinuity of the pattern were completely uncomfortable, and the weld portion was completely unknown. This pattern is as Figure 5, were granted similarly to the apron and the back guard. In addition, when the pattern is spread out while fading, the shading of the pattern creates a three-dimensional effect, and has a unique texture.
(6) This product was cut to the required length, and a hole for attaching a washbasin was made in the center to make a vanity stand. The same pattern as the surface continued continuously in the cross section of the opening, and the hole had no discomfort at all.
[0025]
(Example 2)
Another embodiment of claims 1 to 3 will be described. This example also relates to a method of forming an onyx preparation.
[0026]
(1) Preparation of BMC material A BMC material was prepared in the same manner as (1) of Example 1.
[0027]
(2) Production of BMC material (1) This prepared material was formed into a dumpling in the same manner as in Example 1, and the surface thereof was colored with a solution prepared by dissolving 10 g of brown pigment in 100 g of unsaturated polyester and 100 g of styrene as a coloring agent. The adhesion amount per one dumpling is about 10 g.
(2) This dumpling was boxed in the same manner as in Example 1 and then thickened to obtain a BMC material.
[0028]
(3) Cutting and Forming of BMC Material (1) After cutting the BMC material in the same manner as in Example 1, the surface was cut off to obtain a piece.
(2) Using this BMC piece, a 1200 × 650-size washbasin-ball-integrated counter 30 shown in FIG. 6 was press-formed under the same conditions as in Example 1.
Note that one charge pattern was arranged in the ball 31 and one charge pattern in each of the left and right plane portions 32.
(3) The obtained product had the same appearance as that of Example 1, and the same unique pattern was included in the rising portion from the ball portion to the flat surface.
[0029]
The product thus obtained sufficiently withstood not only various tests but also 3,000 thermal cycle tests, and did not cause any abnormality in the pattern portion .
[0030]
【The invention's effect】
As described above, according to the BMC material and the molding method of the first to third aspects, it is possible to mold a high-quality product having a network-like pattern .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a method according to an embodiment.
FIG. 2 is a perspective view of a BMC material 3;
FIG. 3 is a sectional view showing a molding method.
FIG. 4 is a perspective view showing a molded product.
FIG. 5 is a perspective view of a counter 20.
FIG. 6 is a perspective view of the counter 30.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dump-like lump 3 BMC material 4 BMC piece 6 Product 20, 30 Counter

Claims (3)

A BMC material obtained by adhering a colorant to the outer surface of the BMC mass in a plastic state, making the plurality of masses adhere to each other, and increasing the viscosity , wherein the cut surface obtained by cutting the BMC mass is the colorant. BMC material characterized in that a pattern derived from is exposed in a mesh pattern . 2. The BMC material according to claim 1, wherein the BMC material has a rectangular parallelepiped shape. The segments obtained by cutting with Sogiotosu of BMC material of the outer surface according to claim 2 the BMC material into a plurality arranged in a mold, by heating under pressure, meshes spread two-dimensionally A BMC molding method for molding a BMC molded body having a network pattern .

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