KR100387088B1 - Synthetic resin mold having color-changing character according to ambient temperature and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a synthetic resin molded article and a method for manufacturing the molded article that can be discolored according to the ambient temperature by including a thermosensitive pigment in the molding resin used for the production of the molded article during the manufacture of the synthetic resin molded article, 10 to 30% by weight of the colorant mixed in the range of 10 to 50% by weight of the thermochromic pigment and 50 to 90% by weight of the colored pigment, 20 to 40% by weight of the molding resin and the remaining amount of the molding mixture containing the filler as the remaining amount; It is made by molding into an article such as a washbasin or a bath by using a coating mixture containing 30% by weight and 70 to 90% by weight of a molding resin. Therefore, according to the present invention, there is provided an synthetic resin molded article discolored according to the ambient temperature, and also has an effect of providing a method for producing a synthetic resin molded article discolored.

Description

Synthetic resin mold having color-changing character according to ambient temperature and manufacturing method

The present invention relates to a synthetic resin molded article that is discolored according to the ambient temperature and a method of manufacturing the same. More specifically, the present invention is a synthetic resin molded article and a method for manufacturing the molded article that can be discolored according to the ambient temperature by including a thermosensitive pigment in the molding resin used for the production of the molded article during the manufacture of the synthetic resin molded article It is about.

Synthetic resin molded articles molded into shapes according to these applications are widely used in interior materials for convenience of use such as washbasins and bathtubs in buildings in which people live, such as homes. Although these resin molded articles have the same or similar shape and function as those of the container-type articles used from whales, they have been formed from wood, metal, or stone, and have been improved in water resistance, water repellency, and moldability due to the development of the chemical industry. It was replaced by excellent synthetic resin.

In particular, the use of synthetic resin molded articles has been expanded in recent years due to excellent moldability and colorability of synthetic resins.

In the production of synthetic resin molded articles, thermosetting resins such as unsaturated polyester resins are usually used as molding resins. The thermosetting resin may be cured by initial heating, and since the curable resin has a property of not being softened by reheating once it has been cured, it is particularly advantageous in form stability.

The synthetic resin molded article is molded into a mold by adding a filler and a pigment to a molding resin, and the molded article is formed into a molded article. Fillers may be used. The filler is mixed with the molding resin to reduce the amount of molding resin used, and serves to increase the mechanical properties. As pigments, almost all kinds of commercially available colored pigments can be used. In particular, colored pigments such as titanium dioxide (TiO ₂ ) can be used to impart white color to improve cleanliness. It plays a role.

However, such a conventional synthetic resin molded article may be monotonous in use because it is limited only to the color developed in the initial production, and in particular, it is limited to an excessively white product because it emphasizes cleanliness.

Recently, in order to solve such a disadvantage, there is a case of giving a color of blue or marble texture, etc., but it is also fixed in the initial given color has a disadvantage in that almost no improved effect in terms of monotony in use. In addition, if the synthetic resin product contains water that comes in direct contact with the human body, such as in a washbasin or bathtub, the water temperature cannot be detected except when there is not a lot of steaming. There was a drawback that you can only feel soak water temperature directly on the skin.

Accordingly, the present inventors have made intensive studies to develop synthetic resin molded articles, such as baths, which are discolored according to the ambient temperature, such as water temperature. As a result, the molded article is prepared by including thermosensitive pigments in the molding resin in the manufacturing process of the synthetic resin molded article. The synthetic resin molded article discolored according to the present invention was completed.

An object of the present invention is to provide a synthetic resin molded article that is discolored according to the ambient temperature.

Another object of the present invention to provide a method for producing a synthetic resin molded article that is discolored according to the ambient temperature.

Synthetic resin molded article discolored according to the ambient temperature according to the present invention, 10 to 30% by weight of the colorant mixed in the range of 10 to 50% by weight of the thermal pigment and 50 to 90% by weight of the pigment, 20 to 40% by weight of the molding resin and It is formed by molding into an article such as a washbasin or a bath by using a molding mixture containing a filler as a residual amount and a coating mixture containing 10 to 30% by weight of the coloring agent and 70 to 90% by weight of the molding resin.

The thermochromic pigment is 2,2-dibutylamino-6-methyl-7-anilinofluorane, 2,2- as an electron donating material (chromic component). 2,2-butylisoamyl-6-methyl-7-anilinofluorane, 3,3, -dibutylamino-6-methyl-7-anilinofluorane (3,3-dibutylamino-6-methyl-7-anilinofluorane), 3,3, -dimethylamino-6-methyl-7-anilinofluorane (3,3-dimethylamino-6-methyl-7-anilinofluorane), etc. Phenolic compounds such as bisphenol-A and bisphenol-S, p-hydroxy benzyl benzoic acid, para It may be made of a mixture of phenylphenol (p-phenyl phenol) and acidic clay.

Parabenzyl biphenyl (PBBP), benzyloxynaphthalene (BON), ethylenebis stearamide, etc. may be further mixed with the thermosensitive dye as a sensitizer.

As the filler, one selected from the group consisting of aluminum hydroxide, silica, dolomite, calcium carbonate or a mixture of two or more thereof may be used.

Synthetic resin molded article discolored according to the ambient temperature according to the present invention, the colored pigment 10 to 30% by weight, the molding resin 20 to 40% by weight and the residual amount of the molding mixture containing the filler, 10 to 50% by weight of the thermopigment pigment It is formed by molding into an article such as a washbasin or a bath using a coating mixture containing 10 to 30% by weight of the coloring agent and 70 to 90% by weight of the molding resin mixed in the range of 50 to 90% by weight of the pigment.

The synthetic resin molded article is formed by partially coating the surface of the molded article with two or more coating mixtures having different mixing ratios of thermal dyes and colored pigments.

In addition, the method for producing a synthetic resin molded article discolored according to the ambient temperature according to the present invention, (1) a mold preparation step of applying a release wax to a mold having an internal space having an appearance of the molded article; (2) a molding mixture comprising 10 to 30% by weight of a colorant mixed in a range of 10 to 50% by weight of a thermochromic pigment and 50 to 90% by weight of a colored pigment, 20 to 40% by weight of a molding resin, and the remaining amount, and a filler; A mixture preparation step of preparing a coating mixture including 10 to 30 wt% and 70 to 90 wt% of a molding resin by mixing; (3) coating coating step of coating the prepared coating mixture by a conventional method such as spray coating or brush coating; (4) a coating curing step of leaving the coating-coated mold to remove bubbles and then curing by thermal or natural curing; (5) a molding step of inserting the molding mixture into the coated mold and molding by applying vibration; (6) an initial curing step of curing the molded article to have a certain strength in the mold; And (7) re-curing to cure the molded article released from the mold.

In the preparation of the mixture in step (2), only the coating mixture may include thermosensitive dye.

In the preparation of the mixture of step (2), the coating mixture is prepared with two or more coating mixtures having different mixing ratios of thermochromic pigments and colored pigments, and the two or more coating mixtures are prepared in the coating coating step of (3). It is possible to coat more than two coating mixtures separately from each other.

Hereinafter, the present invention will be described in detail with reference to specific examples.

Synthetic resin molded article discolored according to the ambient temperature according to the present invention is characterized in that it is possible to discolor according to the ambient temperature by producing a molded article by mixing the thermochromic dye discolored according to the ambient temperature with a pigment pigment in a molding resin. .

That is, the synthetic resin molded article discolored according to the ambient temperature according to the present invention 10 to 30% by weight of the colorant mixed in the range of 10 to 50% by weight of the thermal pigment and 50 to 90% by weight of the pigment, 20 to 40% by weight of the molding resin And a molding mixture containing a filler as a residual amount and a coating mixture containing 10 to 30% by weight of the colorant and 70 to 90% by weight of a molding resin. .

The thermochromic constituting the colorant is reversibly changed in color depending on the ambient temperature, the situation has been reported recently applied to a discoloration paint or textile paper for buildings. In particular, the electron donating material and the electron accepting material may specifically refer to a coloring pigment that is discolored by the exchange of electrons in a specific atmosphere. Such thermochromic pigments can be understood to be well known to those skilled in the art that microencapsulations containing both an electron donating material and an electron accepting material are commercially provided by leading manufacturers. have. Commercially available examples include those commonly referred to as `` leuco dyes, '' which are electron donating materials, i.e., 2,2-dibutylamino-6-methyl-7-anilinofluorane (2,2) -dibutylamino-6-methyl-7-anilinofluorane), 2,2-butylisoamyl-6-methyl-7-anilinofluorane, 3,3 3,3-dibutylamino-6-methyl-7-anilinofluorane, 3,3, -dimethylamino-6-methyl-7-anilinofluorane (3,3-dimethylamino-6-methyl-7-anilinofluorane) is an electron-accepting substance, ie, phenolic compounds such as bisphenol-A, bisphenol-S, and para- It may be mixed with hydroxy benzyl benzoic acid, p-phenyl phenol, acidic clay, etc., which may be colored and discolored by the exchange of electrons. In addition, parabenzyl biphenyl (PBBP), benzyloxynaphthalene (BON), ethylene bis stearamide, and the like may be further mixed therein as a sensitizer. In addition, as a brand name, benzoyl leuco methylene blue, crystal violet-lactone, PS-150 (PSD-150), PS-180 (PSD-180), Ovidy-One (ODB-I), Ovidi-toOBB- II), S-205 (S-205), TA-51 (TH-51), Tage-21 (TG-21), Tage-31 (TG-31), etc. are mentioned. However, the above-mentioned thermochromic pigments are only listed by way of example, and the present invention is not limited thereto, and it is well known to those skilled in the art to appropriately select among various commercially available thermochromic pigments and to purchase and use them. Can be understood.

In addition, as the other pigment constituting the colorant, almost any kind of colored pigments commercialized may be used, and in particular, to give white color to improve cleanliness, such as titanium dioxide (TiO ₂ ) Pigments may be used and serve to produce the desired color in the resin molding.

The filler may be selected from the group consisting of aluminum hydroxide, silica, dolomite, calcium carbonate or a mixture of two or more thereof, and these are mixed with the molding resin to reduce the amount of the molding resin used and to improve mechanical properties. .

The molding resin may be one selected from the group consisting of conventional thermosetting resins such as unsaturated polyester. In particular, the molding resin may include a curing accelerator for promoting curing. Molding resins, such as unsaturated polyesters containing such a curing accelerator can also be understood to be known enough to be able to buy and use commercially supplied by leading domestic and foreign manufacturers.

In the case of the molding mixture, the coloring agent may be included in the range of 10 to 30% by weight, when the coloring agent is included in less than 10% by weight, the coloring may not be made sufficiently, if the content exceeds 30% by weight, There may be a problem that affects the properties of the molded article obtained by affecting the content of the resin or filler. When the thermal pigment is included in the mixing ratio of the colored pigment to the thermal pigment in the colorant in less than 10% by weight, there may be a problem that the discoloration effect according to the ambient temperature in the obtained molded article is not enough, on the contrary more than 50% by weight Although there is no great effect on the effect, there may be a problem in which the color of the original product due to the pigment is insufficient.

In addition, when the molding resin is contained in less than 20% by weight, there may be a problem that the durability is weakened due to insufficient resin components, the excess of more than 40% by weight of the filler reduces the mechanical strength and excessive resin There may be problems such as use.

In addition, the synthetic resin molded article discolored according to the ambient temperature according to the present invention, 10 to 30% by weight pigment, 20 to 40% by weight molding resin and the remaining amount of the mixture containing the filler as a residual amount, 10 to 50% by weight And a coating mixture comprising 10-30 wt% of a colorant and 70-90 wt% of a molding resin mixed in a color pigment in a range of 50-90 wt%, to form an article such as a basin or bath. do. In the case of the molded article obtained in this case, the thermochromic pigment is concentrated only on the surface of the molded article, it is possible to economically obtain a molded article discolored according to the ambient temperature without a large difference in the discoloration effect.

In addition, the synthetic resin molded article may be partially coated on the surface of the molded article with two or more coating mixtures having different mixing ratios of thermochromic pigments and pigmented pigments to form a predetermined pattern. The formation of such a pattern has an advantage that various patterns can be formed on the surface of a molded article by a method such as brush painting.

In addition, the method for producing a synthetic resin molded article discolored according to the ambient temperature according to the present invention, (1) a mold preparation step of applying a release wax to a mold having an internal space having an appearance of the molded article; (2) a molding mixture comprising 10 to 30% by weight of a colorant mixed in a range of 10 to 50% by weight of a thermochromic pigment and 50 to 90% by weight of a colored pigment, 20 to 40% by weight of a molding resin, and the remaining amount, and a filler; A mixture preparation step of preparing a coating mixture including 10 to 30 wt% and 70 to 90 wt% of a molding resin by mixing; (3) coating coating step of coating the prepared coating mixture by a conventional method such as spray coating or brush coating; (4) a coating curing step of leaving the coating-coated mold to remove bubbles and then curing by thermal or natural curing; (5) a molding step of inserting the molding mixture into the coated mold and molding by applying vibration; (6) an initial curing step of curing the molded article to have a certain strength in the mold; And (7) re-curing to cure the molded article released from the mold.

In the mold preparation step of (1), by applying a release wax to a mold having an internal space having an outer shape of a molded article, it is easy to release the molded article after molding.

In the preparation of the mixture in the step (2), in preparing the molding mixture and the coating mixture, respectively, the molding mixture is 10 to 30% by weight of the colorant mixed in the range of 10 to 50% by weight of the thermal pigment and 50 to 90% by weight of the colored pigment, 20 to 40% by weight of the molding resin and the remaining amount of the filler is evenly mixed, the coating mixture consists of evenly mixing the molding resin of 10 to 30% by weight and 70 to 90% by weight of the colorant.

In the coating coating step (3), the coating mixture constituting the surface of the molded article is applied to the mold in advance. After molding, the coating composition coated in the coating coating step forms the surface of the molded article. The coating coating in the coating coating step consists of coating a viscous, liquid coating mixture on the mold by a conventional method such as spray coating or brush coating.

In the coating curing step of (4), the coated coating mold is left to remove bubbles and then cured by thermal or natural curing to complete the surface. The surface is changed by the molding mixture during the subsequent injection of the molding mixture. Prevents non-uniformity

In the forming step (5), the molding mixture is put into a mold which is substantially constituting the entire molded article, and is formed by applying vibration. By this forming step, the mold is filled with the molding mixture, and after molding, the mold is released so that a complete molded product can be obtained.

In the initial curing step of (6), the mold is easily cured to have a certain strength in the mold before the molded article is released from the mold.

The recuring step of (7) is a step of completely curing the molded article released from the mold, and this recuring step may be omitted as complete curing in the initial curing step, but after the initial curing, the molded part is removed from the mold before complete curing. Since it is generally easy to release, it is divided into initial hardening and rehardening.

In the preparation of the mixture in step (2), only the coating mixture may include thermal dye, and in the case of the molded article obtained by this, the thermal pigment is concentrated only on the surface of the molded article, and the ambient temperature is not significantly different in the discoloration effect. According to the present invention, a molded article discolored can be obtained economically.

In the preparation of the mixture of step (2), the coating mixture is prepared with two or more coating mixtures having different mixing ratios of thermochromic pigments and colored pigments, and the two or more coating mixtures are prepared in the coating coating step of (3). It is possible to coat more than one coating mixture separately from each other, whereby a predetermined pattern can be arbitrarily formed, and various patterns can be formed on the surface of the molded article.

Hereinafter, preferred embodiments and comparative examples of the present invention will be described.

The following examples are intended to illustrate the invention and should not be understood as limiting the scope of the invention.

Example 1

A washbasin was produced using a mold having the shape of the washbasin as an inner space. The mold was prepared by applying a release wax to the inner surface of the mold as a general release agent.

A coating mixture was prepared by mixing 10 kg of a coloring resin (thermochromic pigment: colored pigment = 1: 1) with 90 kg of molding resin, and mixing 30 kg of molding resin, 20 kg of coloring agent, and 50 kg of silica as a filler to prepare a molding mixture. Molding resin As the molding resin, gel-coat polystar (trade name) was used for the preparation of the coating mixture, and marble polystar (trade name) of the same company was used for the production of the molding mixture. It was. These polystars (trade names) contain accelerators. Titanium dioxide was used as a color pigment constituting the colorant, and a thermochromic dye of commercially available leuco dye system was used as the thermal dye.

The coating mixture was applied to the mold to which the release wax was applied, and the coating mixture was applied to a thickness of 0.4 mm by brush coating, and left for 8 minutes in an atmospheric state to remove pinholes (small bubbles) on the surface, and at a temperature of 50 ° C. Heated for about 15 minutes to heat curing.

After thermosetting, the molding mixture is poured and vibrated at a vibration table for about 5 minutes to completely fill the inside, and then left at room temperature for 1 hour for initial curing, and after release, the room temperature is again maintained for 1 hour. The washing machine was left as a synthetic resin molded article according to the present invention.

Example 2

The bathtub was produced using a mold having the shape of the bathtub as an inner space. The mold was prepared by applying a release wax to the inner surface of the mold as a general release agent.

A coating mixture was prepared by mixing 10 kg of a coloring resin (thermochromic pigment: colored pigment = 1: 1) with 90 kg of molding resin, and mixing 30 kg of molding resin, 20 kg of coloring agent, and 50 kg of silica as a filler to prepare a molding mixture. Molding resin As the molding resin, gel-coat polystar (trade name) was used for the preparation of the coating mixture, and marble polystar (trade name) of the same company was used for the production of the molding mixture. It was. These polystars (trade names) contain accelerators. Titanium dioxide was used as a color pigment constituting the colorant, and a thermochromic dye of commercially available leuco dye system was used as the thermal dye.

The coating mixture was coated with a release wax-coated mold to a thickness of 0.4 mm by spray coating, and left for 8 minutes in air to remove pinholes (small bubbles) on the surface, and at a temperature of 50 ° C. Heated for about 15 minutes to heat curing. Spray coating was sprayed at a height of 30 to 40 cm above the surface of the mold, but evenly sprayed without overlapping until sprayed once on the entire surface.

After thermosetting, the molding mixture is poured and vibrated at a vibration table for about 5 minutes to completely fill the inside, and then left at room temperature for 1 hour for initial curing, and after release, the room temperature is again maintained for 1 hour. The bath was left as a synthetic resin molded article according to the present invention.

As a result of the synthesis of the above embodiments, depending on the size of the molded article can be formed by using a coating mixture in a variety of ways, such as brush coating or spray coating, and can also be formed freely by the brush coating various synthetic resin molded articles It could be confirmed that it can be obtained. The surface of the obtained molded product showed a smooth surface with a gloss, and it was visually confirmed that it was discolored with ambient temperature by the thermochromic dye contained in the molded product.

According to the present invention, there is provided an synthetic resin molded article discolored according to the ambient temperature, and has an effect of providing a method for producing a synthetic resin molded article discolored, wherein the surface of the molded article exhibits a smooth surface having a gloss.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications are within the scope of the appended claims.

Claims (8)

10 to 30% by weight of the colorant mixed in the range of 10 to 50% by weight of the thermochromic pigment and 50 to 90% by weight of the colored pigment, 20 to 40% by weight of the molding resin and the remaining amount of the molding mixture containing the filler as the remaining amount; A synthetic resin molded article discolored according to ambient temperature, characterized in that it is formed by molding into an article such as a wash basin or a bath by using a coating mixture containing 30% by weight and 70 to 90% by weight of a molding resin. The method of claim 1, The thermosensitive pigment is 2,2-dibutylamino-6-methyl-7-anilinofluorane, 2,2- as an electron donating material (chromic component). 2,2-butylisoamyl-6-methyl-7-anilinofluorane, 3,3, -dibutylamino-6-methyl-7-anilinofluorane (3,3-dibutylamino-6-methyl-7-anilinofluorane), 3,3, -dimethylamino-6-methyl-7-anilinofluorane (3,3-dimethylamino-6-methyl-7-anilinofluorane), etc. Phenolic compounds such as bisphenol-A and bisphenol-S, p-hydroxy benzyl benzoic acid, para The synthetic resin molded article, characterized in that the mixture is made of phenylphenol (p-phenyl phenol) and acid clay. The method of claim 1, The synthetic resin molded article, characterized in that parabenzyl biphenyl (PBBP), benzyloxynaphthalene (BON), ethylene bis stearamide, and the like are further mixed as the sensitizing dye. The method of claim 1, The synthetic resin molded article, characterized in that used as the filler is selected from the group consisting of aluminum hydroxide, silica, dolomite, calcium carbonate or a mixture of two or more thereof. (delete) (1) a mold preparation step of applying a release wax to a mold having an internal space having an appearance of a molded article; (2) a molding mixture comprising 10 to 30% by weight of a colorant mixed in a range of 10 to 50% by weight of a thermochromic pigment and 50 to 90% by weight of a colored pigment, 20 to 40% by weight of a molding resin, and the remaining amount, and a filler; A mixture preparation step of preparing a coating mixture including 10 to 30 wt% and 70 to 90 wt% of a molding resin by mixing; (3) coating coating step of coating the prepared coating mixture by a conventional method such as spray coating or brush coating; (4) a coating curing step of leaving the coating-coated mold to remove bubbles and then curing by thermal or natural curing; (5) a molding step of inserting the molding mixture into the coated mold and molding by applying vibration; (6) an initial curing step of curing the molded article to have a certain strength in the mold; And (7) re-curing to cure the molded article released from the mold; Method of producing a synthetic resin molded article that is discolored according to the ambient temperature, characterized in that made. (delete) (delete)