JP2023158267A - Pattern material for plastic molding, patterned plastic molding blended with the same, and method for manufacturing pattern material for plastic molding - Google Patents

Abstract

To provide a pattern material for a plastic molding which has heat resistance without impairing designability, a patterned plastic molding blended with the same, and a method for manufacturing a pattern material for a plastic molding.SOLUTION: A pattern material for a plastic molding is composed of a base material 2, and a colored layer 3 formed on the surface of the base material 2. The base material 2 is composed of a flaky mica, and the colored layer 3 is formed of a coating material containing at least a pigment 4 containing a titanium oxide-coated mica where the surface of the flaky mica particle is coated with a titanium oxide as a main component, a resin, and a solvent.SELECTED DRAWING: Figure 2

Description

The present invention relates to a handle material for a plastic molded product, a patterned plastic molded product containing the same, and a method for manufacturing the handle material for a plastic molded product. More specifically, the present invention relates to a handle material for a plastic molded product consisting of a base material and a colored layer formed on the surface of the base material, a patterned plastic molded product containing the same, and a method for manufacturing the handle material for a plastic molded product.

Conventionally, a patterned plastic molded product has been formed by mixing a pattern material into a heated and melted thermoplastic resin, and for example, a method for manufacturing artificial marble as shown in Patent Document 1 is known. There is. However, as shown in paragraph 0015 of the same document, the same type of resin as the molded product is generally used for the handle material, and a handle material that has heat resistance that can be used for molding at high temperatures is desired. was.
Furthermore, a method for manufacturing a resin molded product is also known, for example as shown in Patent Document 2. In this method, the molding material contains capsules in which the colorant is covered with a film and the film is ruptured by the heat during press molding, allowing the colorant to flow in the molding material. to form various patterns. In such cases, the coloring agent may fade or change color due to the heat during molding, and the design of the pattern may deteriorate.

In addition, molding materials such as sheet molding compounds (SMC) and bulk molding compounds (BMC) used in housing equipment, etc. are usually heated and hardened at 100 to 180 degrees Celsius, so molding at high temperatures is assumed. In many cases, this is not done, and discoloration or fading of the handle material due to heat is not taken into consideration. Therefore, if it were possible to manufacture a heat-resistant handle material that does not impair its design without causing changes such as fading of the colored layer due to high-temperature molding, new uses would arise.

JP2003-95723A JP 2018-34333 Publication

In view of such conventional circumstances, the present invention provides a handle material for plastic molded products that has heat resistance without impairing the design, a patterned plastic molded product containing the same, and a method for manufacturing the handle material for plastic molded products. The purpose is to

In order to achieve the above object, the handle material for plastic molded products according to the present invention is characterized by having a structure consisting of a base material and a colored layer formed on the surface of the base material, wherein the base material is made of flaky mica. (mica), and the colored layer is formed by a paint containing at least a pigment (pearl pigment) whose main component is titanium oxide-coated mica, in which the surface of thin plate-shaped mica particles is coated with titanium oxide, a resin, and a solvent. It lies in being done.

According to the above configuration, since the base material is flaky mica, thermal deformation of the mica as the base material is suppressed even at high temperatures of, for example, 300° C. or higher, and the designability does not deteriorate. Moreover, the colored layer is formed of a paint containing a pigment whose main component is titanium oxide-coated mica, which is obtained by coating the surfaces of thin plate-like mica particles with titanium oxide. The coloration of pigments is usually due to the absorption and scattering of light by the pigment particles themselves, but the coloration of pearl pigments is due to the multiple reflection of light on the titanium oxide layer on the surface of the mica particles and the resulting interference. Therefore, titanium oxide-coated mica is less susceptible to the effects of external environments such as light and heat, and is stable both physically and chemically. Therefore, it is thought that by forming a colored layer on the surface of the flaky mica base material using a paint containing pearl pigment as a main component, discoloration and fading of the handle material will be suppressed even at high temperatures of 300°C or higher. It will be done. Furthermore, the inventors have also discovered that the colored layer containing the pearl pigment does not peel off from the surface of the mica base material and is firmly adhered to the surface. Since the main component (material) of the base material and the colored layer is mica, which is the same material, the shrinkage and expansion rates are the same, so even if large changes in the temperature environment occur during molding, etc., the contact surface This is thought to be due to the fact that the adhesion is maintained. In this way, even at high temperatures, it can be used as a handle material without deteriorating its functionality (design).

In this case, the size of the mica is preferably 0.01 mm to 20 mm. If it is within the above numerical range, it can be used without deteriorating its function as a handle material.

Further, the particle size of the titanium oxide-coated mica is preferably 5 μm to 200 μm. Within the above numerical range, heat resistance can be ensured without deteriorating the function (design) as a handle material.

In addition, in order to achieve the above object, a patterned plastic molded product containing the handle material for a plastic molded product according to the present invention is characterized in that a handle material for a plastic molded product according to any of the above configurations is added to a thermoplastic resin. This is due to the combination. In this case, for example, the thermoplastic resin may be ABS resin or polycarbonate resin. As described above, since the handle material for plastic molded products has heat resistance, it can be used for thermoplastic resins such as ABS resin and polycarbonate resin that require processing such as molding at high temperatures.

In addition, in order to achieve the above object, the method for manufacturing the handle material for plastic molded products according to the present invention is characterized by using flaky mica and oxidized oxide in which the surface of the thin plate-shaped mica particles as the main component is coated with titanium oxide. A pigment whose main component is titanium-coated mica and a paint containing at least a resin and a solvent are stirred and mixed to form the colored layer on the surface of the mica using the paint.

According to the characteristics of the handle material for plastic molded products according to the present invention, the patterned plastic molded product containing the same, and the method for manufacturing the handle material for plastic molded products, heat resistance can be improved without impairing design. It has become possible.

Other objects, configurations, and effects of the present invention will become apparent from the following description of embodiments.

1 is an enlarged photograph of a patterned plastic molded product containing the handle material for plastic molded products according to the present invention. FIG. 3 is a cross-sectional view schematically showing a handle material for a plastic molded product. It is a figure explaining the coloring process of the handle material for plastic molded products based on this invention. 3 is a partially enlarged photograph of the handle material of Example 1 before the test. It is a partially enlarged photograph of the handle material of Comparative Example 1 before the test. It is a partially enlarged photograph of the handle material of Comparative Example 2 before the test. It is a partially enlarged photograph of the handle material of Comparative Example 3 before the test. 3 is a partially enlarged photograph showing the state of the handle material after the heat resistance test of Example 1. 3 is a partially enlarged photograph showing the state of the handle material after the heat resistance test of Comparative Example 1. 3 is a partially enlarged photograph showing the state of the handle material after the heat resistance test of Comparative Example 2. It is a partially enlarged photograph showing the state of the handle material after the heat resistance test of Comparative Example 3. 2 is a partially enlarged photograph showing the state of the handle material after the fading durability test of Example 1. 3 is a partially enlarged photograph showing the state of the handle material after the fading durability test of Comparative Example 1. It is a partially enlarged photograph showing the state of the handle material after the fading durability test of Comparative Example 2. It is a partially enlarged photograph showing the state of the handle material after the fading durability test of Comparative Example 3. 3 is a partially enlarged photograph showing the state of the handle material after a further fading durability test in Example 1.

Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate.
A handle material 1 for a plastic molded product according to the present invention (hereinafter simply referred to as "handle material") includes a base material 2 and a colored layer formed on the surface of the base material 2, as roughly shown in FIGS. 1 and 2. It consists of 3. This handle material 1 is blended with thermoplastic resin and processed into a patterned plastic molded product. The width of the patterned plastic molded product (plate-shaped body) illustrated in FIG. 1 is approximately 10 cm.

Since the handle material 1 according to the present invention has a heat resistance of about 300° C. as described later, it can be molded by being blended with a thermoplastic resin whose molding temperature is relatively high, such as ABS resin or polycarbonate resin. The function (design) of the handle material is not lost due to the heat during molding, and the handle clearly appears in the plastic molded product. Of course, the handle material 1 can be applied not only to thermoplastic resins such as the above-mentioned ABS resin and polycarbonate resin, but also to thermoplastic resins that can be molded at lower temperatures than these resin materials.

(Base material)
As shown in FIG. 2, the base material 2 has a flaky shape and is made of natural mica or synthetic mica. The size of the flaky mica 2 (hereinafter referred to as flaky mica 2) serving as this base material is, for example, about 0.01 mm to 20 mm in length of one piece (length of the longest part). Alternatively, the flaky mica 2 preferably has a particle size of about 4 mesh to 166 mesh in terms of JIS test sieve mesh. If it is below these lower limits, it will be difficult to clearly develop a pattern when it is blended into a plastic molded product. On the other hand, if the content exceeds these upper limits, when mixed with a thermoplastic resin and molded, they will not be sufficiently mixed with each other, resulting in a poor finish as a molded product.

(colored layer)
The colored layer 3 is formed from a pigment (hereinafter sometimes referred to as "pearl pigment") 4 whose main component is titanium oxide-coated mica, which is formed by coating the surface of thin plate-shaped mica particles with titanium oxide. The particle size of this pearl pigment 4 is approximately 5 μm to 200 μm. If it is below this lower limit, it will be difficult to clearly develop a pattern when it is blended into a plastic molded product. On the other hand, if the content exceeds these upper limits, when mixed with a thermoplastic resin and molded, they will not be sufficiently mixed with each other, resulting in a poor finish as a molded product.

Here, since the color development (coloring) of general pigments is due to the absorption and scattering of light by the pigment particles themselves, the pigments themselves are susceptible to discoloration or fading due to the influence of the external environment. On the other hand, the above-mentioned pearl pigments develop color through multiple reflections of light on the titanium oxide layer on the surface of the mica particles and the resulting interference, and therefore are not easily affected by external environments such as light and heat. Furthermore, titanium oxide-coated mica is physically and chemically stable. Therefore, it is thought that pearl pigments are less likely to change color or fade due to heat.

(Production method)
The pattern material 1 according to the present invention is made by coloring flaky mica 2 classified into the above-mentioned sizes with a pearl pigment 4.
In the coloring process, mica flakes 2 and paint are put into a drum 11 of an agitator (tumbler) 10, and the blades 12 and drum 11 perform rotational stirring and mixing. Here, the paint contains at least a resin, a pearl pigment 4 as a main component, and a solvent, and is blended in a proportion of 2% by weight or more and 20% by weight or less based on the flaky mica 2. Below the lower limit, the amount of paint applied to the mica flakes 2 is small, and the paint does not spread to each mica flake 2, resulting in insufficient coloration and uneven coloring. On the other hand, when the upper limit is exceeded, too much paint is used, and it takes time to form (particularly dry) the colored layer 3, reducing production efficiency. In addition, the mica flakes 2 tend to stick together and form clumps (blocks), resulting in non-uniform particle sizes. The paint is produced by dispersing the pearl pigment 4 with a disper, further dispersing it by adding glass beads, and then mixing the pearl pigment 4 with a resin and a solvent and stirring with a disper.

The paint contains 20% by weight or more and 49.5% by weight or less of resin. If it is less than the lower limit, it will not function sufficiently as a binder, making it difficult to fix and maintain the pigment on the flaky mica 2, resulting in decreased solvent resistance and easy discoloration. On the other hand, when the upper limit is exceeded, the resin adheres the mica flakes 2 to each other to form blocks (clumps), making it difficult to disperse and color the mica flakes 2 individually.

Further, the paint contains 0.5% by weight or more and 20% by weight or less of pearl pigment 4. Below the lower limit, sufficient color development cannot be ensured. On the other hand, when the upper limit is exceeded, the amount of pigment becomes too large, and the pigment that cannot be fixed on the surface of the mica flakes 2 by the resin will be eluted (color fading).

Further, the paint contains a solvent of 30% by weight or more and 75% by weight or less. If it is less than the lower limit, it will be difficult to sufficiently disperse the pearl pigment 4 and the resin in the paint, making it difficult to color the flaky mica 2 and easily causing color unevenness. On the other hand, if the upper limit is exceeded, part of the paint will accumulate at the bottom of the tumbler, making it difficult to fix the pearl pigment 4 to the flaky mica 2. Moreover, it takes time to form (particularly dry) the colored layer 3, and production efficiency also decreases. Note that ethyl acetate, toluene, acetone, ethanol, butanol, ethyl acetate, butyl acetate, etc. are used as the solvent.

This coloring step promotes fixation (hardening) of the pearl pigment 4 in the paint onto the outer circumferential surface of the flaky mica 2 by performing sufficient heating. Here, the flaky mica 2 and the pearl pigment 4 have heat resistance.

Further, since the mica flakes 2 are colored while moving (stirring) within the drum 42, the mica flakes 2 are prevented from sticking together and forming clumps. Furthermore, by rotating and stirring the mixture, the paint containing the pearl pigment 4 can be spread over the entire outer surface of the mica flake 2, and a colored layer 3 (paint film) of the pearl pigment 4 is formed on all the outer surfaces of the mica flake 2. colored. Thereafter, it is taken out from the stirrer 40 and dried to volatilize the solvent, forming the handle material 1.

Here, in order to confirm the effectiveness of the present invention, the inventors conducted an experiment to confirm the heat resistance and fading durability of the following Examples and Comparative Examples 1 to 3.
The example is a handle material colored with a paint containing flaky mica 2 as a main component and pearl pigment 4, as shown in FIG. 4a. Further, Comparative Example 1 is a pattern material in which flaky mica 2 is colored with a paint containing a disazo pigment, which is one of organic pigments, as a main component, and is shown in FIG. 4b. Comparative Example 2 is a pattern material that is colored with a paint containing pearl pigment 4, which has a base material made of PET (polyethylene terephthalate) resin as its main component, and is shown in FIG. 4c. Comparative Example 3 is a pattern material in which a base material made of PET resin is colored with a disazo pigment, which is one of organic pigments, and is shown in FIG. 4d. Examples and Comparative Examples 1 to 3 were all colored using the above coloring process. Note that the magnification of each photograph shown in FIGS. 4a to 4d is approximately 280 times.

First, the inventors heated the prepared Example 1 and Comparative Examples 1 to 3 on an iron plate from room temperature to 250°C while measuring the surface temperature of the handle material in real time with a radiation thermometer. The condition was visually observed. The observation results (photographs) are shown in Figures 5a to 5d. As shown in these figures (photographs), in Comparative Examples 2 and 3 in which PET resin was used as the base material, the base material itself melted and shrank, and did not function as a handle material. On the other hand, in Example 1 and Comparative Example 1, in which the base material was Mica 2 flakes, there was almost no change in the state from before heating, and they functioned as handle materials. Note that the magnification of each photograph shown in FIGS. 5a to 5d is approximately 280 times.

Next, the inventors heated the produced Example 1 and Comparative Examples 1 to 3 from room temperature to 300°C on an iron plate while measuring the surface temperature of the handle material in real time with a radiation thermometer. The condition was visually observed. The observation results (photographs) are shown in Figures 6a to 6d. As shown in these figures (photos), in Comparative Example 1 and Comparative Example 3 using organic pigments, the pigments themselves discolored and faded, and the function (design) of the pattern material deteriorated. The coloration (coloring) of ordinary organic pigments is due to the absorption and scattering of light by the pigment particles themselves, so it is assumed that the pigment itself is affected by heat and changes in light absorption and scattering occur. Seem. Further, in Comparative Example 2 using a pearl pigment, no discoloration of the pigment could be confirmed, but the PET resin base material itself turned yellow, and the function (design) of the pattern material deteriorated. On the other hand, in the example colored with pearl pigment, the pigment did not change color and functioned as a pattern material. The color development of the pearl pigment is due to the multiple reflection of light on the titanium oxide layer on the surface of the mica particles and the resulting interference, so it is thought that it is less susceptible to the influence of external environments such as heat and did not fade. The examples were heated at 320° C. for 5 minutes in the same manner as above, but as shown in FIG. 7, it was confirmed that neither the base material nor the pigment changed much from before heating, and it functioned as a pattern material. Note that the magnification of each photograph shown in FIGS. 6a to 6c is approximately 280 times. The magnification of each photograph shown in Figures 6d and 7 is approximately 70x.

In this way, by forming the base material 2 from the flaky mica 2 and coloring its surface with the pearl pigment 4, heat resistance can be improved without impairing the design. Moreover, since mica has high transparency (translucency) and pearl pigments have high reflectance, the design can be improved compared to combinations of other base materials and pigments. In addition, flake mica 2 (base material) and pearl pigment 4 (colored layer) have the same main component of mica, so they have the same shrinkage and expansion coefficients, so they can withstand large changes in the temperature environment such as during molding. Even if this happens, the adhesion is maintained and the design is not degraded.

The present invention is applicable not only to sheet materials such as wallpaper, flooring materials, decorative materials, interior materials such as cloth, and building materials, but also as pattern materials for plastic molded products such as artificial marble and various daily necessities and electrical products. be able to.

1: Handle material, 2: Base material (mica), 3: Colored layer, 4: Pearl mica (pearl pigment), 10: Stirrer (tumbler), 11: Drum, 12: Feather

In order to achieve the above object, the handle material for plastic molded products according to the present invention is characterized by having a structure consisting of a base material and a colored layer formed on the surface of the base material, wherein the base material is made of flaky mica. (mica), and the colored layer is formed from a paint containing at least a pigment (pearl pigment) whose main component is titanium oxide-coated mica, which is made by coating the surface of thin plate-shaped mica particles with titanium oxide, a resin, and a solvent. The size of the mica is 0.01 mm to 20 mm, and the particle size of the titanium oxide-coated mica is 5 μm to 200 μm.

According to the above configuration, since the base material is flaky mica, thermal deformation of the mica as the base material is suppressed even at high temperatures of, for example, 300° C. or higher, and the designability does not deteriorate. Moreover, the colored layer is formed of a paint containing a pigment whose main component is titanium oxide-coated mica, which is obtained by coating the surfaces of thin plate-like mica particles with titanium oxide. The coloration of pigments is usually due to the absorption and scattering of light by the pigment particles themselves, but the coloration of pearl pigments is due to the multiple reflection of light on the titanium oxide layer on the surface of the mica particles and the resulting interference. Therefore, titanium oxide-coated mica is less susceptible to the effects of external environments such as light and heat, and is stable both physically and chemically. Therefore, it is thought that by forming a colored layer on the surface of the flaky mica base material using a paint containing pearl pigment as a main component, discoloration and fading of the handle material will be suppressed even at high temperatures of 300°C or higher. It will be done. Furthermore, the inventors have also discovered that the colored layer containing the pearl pigment does not peel off from the surface of the mica base material and is firmly adhered to the surface. Since the main component (material) of the base material and the colored layer is mica, which is the same material, the shrinkage and expansion rates are the same, so even if large changes in the temperature environment occur during molding, etc., the contact surface This is thought to be due to the fact that the adhesion is maintained. Further, the size of the mica is 0.01 mm to 20 mm. Within this numerical range, it can be used without deteriorating its function as a handle material. Moreover, the particle size of the titanium oxide-coated mica is 5 μm to 200 μm. Within this numerical range, heat resistance can be ensured without deteriorating the function (design) as a handle material. In this way, even at high temperatures, it can be used as a handle material without deteriorating its functionality (design).

Claims (6)

A pattern material for a plastic molded product consisting of a base material and a colored layer formed on the surface of the base material,
The base material is made of flaky mica,
The colored layer is formed of a paint containing at least a pigment containing titanium oxide-coated mica as a main component, which is obtained by coating the surface of thin plate-shaped mica particles with titanium oxide, a resin, and a solvent. The handle material for a plastic molded article according to claim 1, wherein the mica has a size of 0.01 mm to 20 mm. The handle material for a plastic molded article according to claim 1 or 2, wherein the titanium oxide-coated mica has a particle size of 5 μm to 200 μm. A plastic molded article with a pattern, which is obtained by blending the handle material for a plastic molded article according to claim 1 with a thermoplastic resin. The patterned plastic molded article according to claim 4, wherein the thermoplastic resin is ABS resin or polycarbonate resin. A method for manufacturing a handle material for a plastic molded product according to claim 1, comprising:
Flaky mica and a paint containing at least a pigment, a resin, and a solvent whose main components are titanium oxide-coated mica, in which the surface of thin plate-like mica particles is coated with titanium oxide, are stirred and mixed, and the above-mentioned coating is applied to the surface of the mica. A method for producing a handle material for a plastic molded product, in which the colored layer is formed using a paint.

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