JP2018034368A - Method for producing resin molded product having pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a resin molded product which can easily form a stripe-shaped flow pattern on a surface of a resin molded product having a complicated shape and a surface of a junction of a plurality of resin molded products, can suppress uniformity of the stripe-shaped pattern of the junction when the plurality of resin molded products are joined to each other, and has a pattern having high designability.SOLUTION: A method for producing a resin molded product includes previously arranging a plurality of resin molded products 1 so as to be adjacent to each other, irradiating a desired portion of the surface of the plurality of resin molded products with ultraviolet rays or supplying heat thereto, thereby changing a color of the plurality of resin molded products, and forming a pattern having a continuous stripe shape 3 on a junction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a resin molded product having a pattern.

  Conventionally, resin molded products such as artificial marble have been widely used for kitchen counters, wash counters, wash bowls, bathtubs and the like because of their high design. Such a resin molded product is usually manufactured by filling a cavity between the upper mold and the lower mold of a mold with a resin composition made of a thermosetting resin and the like, followed by thermoforming.

  Moreover, in the resin molded product manufactured with this metal mold | die, various methods are proposed as a patterning method in order to set it as the resin molded product which has the design property close | similar to the texture of natural marble more.

  Specifically, for example, in a resin composition filled in a mold, there is a manufacturing method in which a colorant component having a compatibility different from that of a resin component of a base resin as a base is added to form a marble-like marble pattern. Proposed. As another method, there has been proposed an artificial marble manufacturing method in which a rod-shaped patterning agent is mixed with resin compositions having different specific gravities, filled in a mold, and cured while the mold is held at a predetermined angle. (For example, refer to Patent Document 1).

JP 2012-111085 A

  However, in the conventional method for producing artificial marble as shown in Patent Document 1, since the expression of the pattern depends on the flow state of the resin composition in the mold, the curing characteristics of the resin composition and the mold It was necessary to carefully determine the temperature control. In particular, when molding a resin molded product having a complicated shape, a problem remains in the stability of the handle.

  Moreover, when joining a some resin molded product, since each resin molded product is shape | molded separately, the nonuniformity may appear in the connection of the pattern of a junction part. Specifically, as shown in FIG. 3, in the manufacture of a kitchen counter, when two resin molded products having marble pattern flow patterns 3 are joined at right angles, the flow patterns 3 of the joints 4 intersect at right angles. In some cases, it was unnatural due to interruption.

  The present invention has been made in view of the above-mentioned conventional problems, and can be easily applied to a surface of a resin molded product having a complicated shape or a joint portion of a plurality of resin molded products. It is an object of the present invention to provide a method for producing a resin molded product having a pattern capable of forming a pattern.

  The present invention is characterized by the following in order to solve the above problems.

  That is, the method for producing a resin molded product having a pattern according to the present invention is a method for producing a resin molded product having a pattern on the surface, wherein a plurality of resin molded products are arranged in advance adjacent to each other, and the plurality of resin molded products are provided. A continuous streak pattern is formed on the joint portion of the plurality of resin molded products by irradiating a desired portion of the surface with ultraviolet rays or supplying heat.

  According to the method for producing a resin molded product having a pattern of the present invention, the surface of a resin molded product having a complicated shape or a joint portion of a plurality of resin molded products can be easily formed with uniform and natural stripes. The manufacturing method of the resin molded product which has a pattern which can form a pattern can be provided.

It is one Embodiment of the manufacturing method of the resin molded product which has a pattern of this invention, and is a front view which shows the irradiation state of ultraviolet rays, or the supply state of heat. It is a schematic plan view which shows the state in which the streaky flow pattern was formed in the two resin molded products connected. It is a schematic plan view which shows the state which connected the two resin molded products which have the pattern of the conventional marble pattern.

  The manufacturing method of the resin molded product having the pattern of the present invention will be described in detail below based on the drawings. FIG. 1 shows an embodiment of a method for producing a resin molded product 1 having a pattern 3 according to the present invention, and shows an irradiation state of ultraviolet rays or a supply state of heat. Moreover, FIG. 2 has shown the state which formed the streaky flow pattern 3 in the resin molded product 1 which connected two.

  In the method of manufacturing the resin molded product 1 having the pattern 3 according to the present invention, a plurality of resin molded products 1 are arranged adjacent to each other in advance, and a desired portion of the surface of the plurality of resin molded products 1 is irradiated with ultraviolet rays or supplied with heat. To do. Thereby, the surface of the some resin molded product 1 is discolored, and the continuous stripe 3 pattern is formed with respect to a junction part.

  In the manufacturing method of the resin molded product 1 having the pattern 3 of the present embodiment, first, the resin molded product 1 shown in FIG. 1 is manufactured. The resin molded product 1 at this stage is a plain resin molded product 1 having no marble pattern 3, and can be manufactured by filling a mold with a resin composition described below and curing it.

  The resin that is the main component of the resin composition is not particularly limited as long as it is a resin that is usually used for the resin molded article 1 of artificial marble. For example, heat such as vinyl ester resin, unsaturated polyester resin, acrylic resin, etc. A curable resin can be used. These thermosetting resins can be used alone or in combination of two or more. Depending on the application, a thermoplastic resin may be used instead of the thermosetting resin.

  A filler, a hardening | curing agent, a crosslinking agent, a coloring agent, a thickener, etc. can be added to the resin composition which has such resin as a main ingredient as needed.

  Examples of the filler include calcium carbonate, glass powder, silica, aluminum hydroxide and the like, and these can be used alone or in combination of two or more. The blending amount of the filler can be blended in the range of 100 to 300 parts by mass with respect to 100 parts by mass of the thermosetting resin, for example. By setting the blending amount of the filler within this range, it is possible to obtain a resin molded product 1 having excellent impact strength, heat resistance, and the like.

  Examples of the curing agent include organic peroxidation such as t-butyl peroxybenzoate, 1,1,3,3-tetramethylbutylperoxy 2-ethylhexanoate and t-hexylperoxy 2-ethylhexanoate. Examples are things. Selection of a hardening | curing agent can be performed based on the value of half-life temperature by the molding temperature of the thermosetting resin to be used. Moreover, the compounding quantity of a hardening | curing agent can be suitably determined according to the kind of thermosetting resin to be used, for example, when using vinyl ester resin as a thermosetting resin, it is 100 mass parts of thermosetting resins. It is preferable to mix | blend with respect to 0.5-5 mass parts with respect to it.

  As the crosslinking agent, for example, when an unsaturated polyester resin is used as the thermosetting resin, an unsaturated hydrophobic vinyl monomer can be used. Specific examples include styrene, methyl methacrylate, monochlorostyrene, diallyl phthalate, triallyl phthalate, and the like. It is preferable to mix | blend the compounding quantity of a crosslinking agent in 0.5 to 5 mass% with respect to the whole quantity of a resin composition.

  The color of the resin composition can be appropriately determined according to the base color of the resin molded product 1 to be manufactured. The resin composition can be colored, for example, by adding a colorant such as a dye, a pigment, or a coloring toner. In addition, when coloring a resin composition, after adding to the thermosetting resin used as a main ingredient beforehand so that the resin molded product 1 may become a single color, it is preferable to knead | mix sufficiently.

The thickener is not particularly limited as long as it is usually a thickener used for adjusting the resin composition, and for example, magnesium oxide, magnesium hydroxide, zinc oxide, isocyanate and the like can be used. In the case of using magnesium oxide, for example, the # 40 count (BET surface area 46 cm ³ / g) having a diameter of 75 μm or less and the # 100 count (BET surface area 85 cm ³ / g) with high activity are preferably used. be able to. These thickeners can be used alone or in combination of two or more.

  In addition, about each said component, it is preferable to use what has the characteristic to discolor by irradiation of an ultraviolet-ray or supply of heat. In particular, since the resin and filler as the main component of the resin composition have a relatively large blending amount with respect to the entire resin composition, it is desirable that the resin and the filler be selected in consideration of the discoloration characteristics.

  In addition, other components other than those described above may be added to the resin composition within a range not impairing the object of the present invention. Examples of these include low shrinkage agents, mold release agents, light stabilizers, ultraviolet color formers, thermal color formers and the like. Among these, the surface of the resin molded product 1 is efficiently discolored by adding an ultraviolet color developer or a thermal colorant, particularly by irradiation with ultraviolet rays or supply of heat, thereby producing a streaky flow pattern 3 having a marble pattern. Can be formed.

  In the manufacturing method of the resin molded product 1 having the pattern 3 according to the present embodiment, the resin composition is filled in a cavity of a mold, and the resin composition is thermally cured to manufacture a single-color resin molded product 1. In addition, although the thermoforming conditions of the metal mold | die at the time of manufacture will not be specifically limited if the resin composition hardens | cures, Usually, the molding temperature of the range of 50 to 120 degreeC is considered.

  Next, after cooling the mold to a predetermined temperature, the resin molded product 1 molded from the mold is taken out. Thus, the monochromatic resin molded product 1 can be manufactured.

  In the manufacturing method of the resin molded product 1 having the pattern 3 of the present embodiment, a plurality of single-color resin molded products 1 manufactured as described above are connected, and the surface is irradiated with ultraviolet rays or as shown in FIG. Heat is supplied to form a streaky flow pattern 3 unique to marble.

  The ultraviolet irradiation can be performed using an ultraviolet lamp or the like as the ultraviolet ray supply source 2. The ultraviolet lamp is not particularly limited as long as it is generally an ultraviolet lamp capable of generating ultraviolet rays. For example, a low-pressure mercury UV lamp, a high-pressure mercury UV lamp, a metal halide UV lamp, or the like can be used.

  The supply of heat can be performed using an infrared heating device, a heater, or the like as the supply source 2. As the infrared heating device, for example, a far infrared heating device or a near infrared heating device can be used. As the heater, for example, an industrial dryer or the like can be used.

  The irradiation amount of ultraviolet rays, the supply amount of heat, and the distance between the supply source 2 of ultraviolet rays and heat and the surface of the resin molded product 1 are not particularly limited, and the characteristics of the thermosetting resin constituting the resin molded product 1 Alternatively, it can be determined appropriately according to the discoloration density of the streaky flow pattern 3 to be formed.

  Moreover, in the manufacturing method of the resin molded product 1 of this embodiment, the mask which uses the part which is going to change the color of the resin molded product 1 as a transmission part, and uses a part other than the part which is going to change color as a protection part It is preferable to perform irradiation of ultraviolet rays or supply of heat in a state of being interposed between 1 and the supply source 2.

  The mask used for forming the streak pattern 3 by irradiation with ultraviolet rays is made of a material that does not transmit ultraviolet rays. Examples of these include a metal plate and an ultraviolet shielding sheet.

  The mask used for forming the streak pattern 3 by supplying heat is made of a material that shields heat. Examples of these include a metal plate and a heat shield sheet having a low thermal conductivity.

  By using a mask in ultraviolet irradiation or heat supply, it is possible to easily and clearly distinguish between the portion of the resin molded product 1 to be discolored and the portion not to be discolored, so that a sharp streaky flow pattern 3 is formed. Can do.

  Further, in the irradiation of ultraviolet rays or the supply of heat, the supply source 2 of ultraviolet rays or heat can be moved along the surface of the resin molded product 1 to change the color. Thereby, the support-like streaky pattern 3 closer to the texture of natural marble can be formed even on the resin molded product 1 having a complicated shape.

  Moreover, in the manufacturing method of the resin molded product 1 having the pattern 3 of the present embodiment, irradiation of ultraviolet rays or supply of heat is performed while moving the surface of the resin molded product 1 relative to the supply source 2 of ultraviolet rays or heat. Preferably it is done. Specifically, for example, as shown in FIG. 1, an ultraviolet or heat supply source 2 is fixed to the upper part of the resin molded product 1, and the resin molded product 1 is moved while being placed on a conveyor or the like. Irradiation or supply of heat can be performed.

  By moving the resin molded product 1 relative to the ultraviolet or heat supply source 2, the streak pattern 3 can be formed with an efficient and stable quality. Further, it is possible to form a more complicated streak pattern 3 by changing the height or radiation intensity of the ultraviolet or heat supply source 2 while changing the mask position.

  In the manufacturing method of the resin molded product 1 having the pattern 3 of the present embodiment, a plurality of resin molded products 1 are arranged adjacent to each other in advance, and a desired portion of the surface of the plurality of resin molded products 1 is irradiated with ultraviolet rays or heated. In order to supply, as shown in FIG. 2, the continuous streak pattern 3 can be formed on the whole of the plurality of resin molded products 1. Thereby, the nonuniformity of the junction part 4 of the resin molded product 1 can be suppressed, and the resin molded product 1 having higher design properties can be manufactured.

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to said embodiment, A various deformation | transformation and change are possible within the range which does not deviate from the summary.

  For example, in the embodiment of the method for manufacturing the resin molded product 1 having the pattern 3, the solid color single-color resin molded product 1 is irradiated with ultraviolet rays or supplied with heat, but the color tone is partially adjusted. The colored resin molded product 1 may be irradiated with ultraviolet rays or supplied with heat.

  Further, by performing irradiation of ultraviolet rays and supply of heat simultaneously or selectively, a more complicated shade pattern 3 can be formed.

DESCRIPTION OF SYMBOLS 1 Resin molded product 2 Supply source of ultraviolet rays or heat 3 Pattern 4 Joint part

Claims (3)

A method for producing a resin molded product having a pattern on the surface,
Preliminarily placing a plurality of resin molded products adjacent to each other, by irradiating ultraviolet rays or supplying heat to desired portions of the surfaces of the plurality of resin molded products, discoloring the surfaces of the plurality of resin molded products, The manufacturing method of the resin molded product which has a pattern characterized by forming the continuous streak pattern with respect to a junction part.   A portion of the resin molded product that is to be discolored is a transmission portion, and a mask that is a portion other than the portion that is to be discolored is a protective portion between the resin molded product and an ultraviolet irradiation source or a heat supply source. 2. The streaky pattern is formed on the surface of the resin molded product in a portion corresponding to a transmission portion of the mask by irradiating with ultraviolet rays or supplying heat in an interposed state. A method for producing a resin molded product having a pattern. Irradiation of ultraviolet rays or supply of heat is performed while moving the surface of the resin molded product relative to a supply source of ultraviolet rays or heat to form a streak pattern on the surface of the resin molded product. The manufacturing method of the resin molded product which has a pattern of Claim 1 or 2 to do.

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