JP2009012451A - Method for molding hormesis composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a composite resin molded article where molding can be facilitated, and further, a molded article can be manufactured at high precision. <P>SOLUTION: A hormesis ore powder composite stock obtained by packing a powdery reinforcing hormesis ore powder raw material of ≥60 wt.% into a matrix resin is used. The hormesis ore powder composite stock is crushed, the crushed pieces of the hormesis ore powder composite stock is arranged on a flat face or on a face with a prescribed cubic shape, are heated and pressurized, and are made close together and integrated, so as to manufacture a composite resin molded article. Various hormesis ore powders can be used as their raw materials. Further, as the matrix resin, various thermoplastic resins can be used. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a hormesis composite material formed in two stages.

  The hormesis rough is used as a material for bedrock baths as it emits low radiation. However, a large amount of raw stone is required to form such a raw stone into a plate shape so that it can be used for a rock bath (Patent Document 1). In addition, it is necessary to adjust the dose within an intensity range of 10 to 10,000 times the natural radiation depending on the treatment target. Therefore, a method is proposed that uses the SMC press method, which compresses and molds a sheet of raw crushed material and resin in advance using a mold, but recycling is possible when the thermosetting resin is a matrix resin. There is a drawback that is almost impossible.

  Therefore, as an alternative to thermosetting resin (GFRP), a method using a recyclable thermoplastic resin such as methyl methacrylate is also conceivable. However, when extrusion molding is employed, the blending ratio of the filler on molding is 30 to 30 at most. 40% and uniform dispersion is difficult. Further, in order to ensure strength, it is desirable to mix the fibers, and it is preferable to use the far-infrared effect, the negative ion effect, and the magnetic line effect at the same time, but it is difficult to mix the filling amount of 40% or more. In order to blend various fillers as needed, it is necessary to achieve high filling, but even if the SMC pressing method (Sheet Molding Compounds) is used. Predetermined SMC sheet using thermoplastic resin It is difficult to prepare (a material obtained by kneading a base material, a resin, and a filler) and lacks mass productivity.

JP 2006-187443 A

  As a result of diligent research, the present inventor has made it possible to use a thermoplastic resin as a matrix, but it is impossible to make the filling compounding amount 60% by weight or more except by the SMC method. When a composite material with a solidified filling material is prepared, pulverized or crushed, and formed into a two-stage molding as a molding material, a filling material content of 60 wt% or more, preferably 70 wt% or more and 85 wt% is obtained. It can be molded even if it is blended with the resin component, and when molded, the low-dose radiation rough powder is uniformly dispersed in the matrix made of the thermoplastic resin together with the inorganic powder and / or the fiber component. It has been found that the effect equivalent to the rough can be achieved.

  The present invention includes a low-dose radiation raw powder and pulverizes or crushes a solidified material obtained by kneading 40 to 15% by weight of a thermoplastic resin with respect to a total of 60 to 85% by weight together with inorganic powder and / or inorganic fiber. Preparing a composite intermediate raw material, filling the composite intermediate raw material into a predetermined mold, and heating and pressurizing the composite intermediate raw material densely packed in the mold, A forming method of a hormesis composite material. The composite intermediate raw material used in the present invention can be easily formed into a sheet by applying it directly into a mold and heating and pressing it with a heat press, a heat roller press, or a belt type press. In the process of filling the mold, a pair of molds is provided with an inlet for introducing the composite intermediate raw material together with the air flow, while an outlet for air flow is provided in the other direction of the mold so that the composite intermediate raw material is formed into the mold together with the air flow While being charged, it is evacuated from below, and the composite intermediate raw material is sequentially deposited and filled in the mold from the downstream side to the upstream side, but instead of this, in the step of filling into the mold, it is formed by a pair of molds. It is also possible to decompress the inside of the mold, open the material inlet, and suck and fill the composite intermediate material into the mold.

  According to the present invention, a composite intermediate material formed by once crushing or crushing a primary molding material highly filled with a hormesis raw stone powder or an inorganic material together with a low-dose radiation raw stone powder is filled in a mold and heated. Since the pressurization is performed, the low-dose radiation rough powder is uniformly dispersed in the resin matrix highly filled with the hormesis rough powder or the inorganic material, and a composite product corresponding to the rough can be molded, and the production cost can be reduced. .

  In addition, according to the present invention, the low-dose radiation raw powder includes a low-dose radiation rough powder, and is composed of 60 to 85% by weight in total with the inorganic powder and / or the inorganic fiber and 40 to 15% by weight of the thermoplastic resin. A hormesis composite material that is uniformly dispersed in a matrix made of a thermoplastic resin together with inorganic powder and / or inorganic fibers can be provided. In the present invention, various low-dose radiation ore, for example, general radiation ore such as uranium ore, thorium ore, radium, radon ore, as well as various low-dose radiation ore such as Badgastein ore However, it is preferable to limit the amount of exposure to 10 to 10,000 times that of natural radiation. In order to achieve not only the compounding amount but also 1000 times of the dose, It is preferred to use cesium 137 ore. In addition, as the inorganic powder, aluminum hydroxide giving heat resistance, tancal which is a plastic product extender, silica, etc., and further, one or more of carbon, barleystone, apocalypse and diatomaceous earth which are far infrared radiation powder, Moreover, magnetic powders, such as inorganic and organic germanium which are various mineral sources, or various rare earth magnet powders, can be included. Examples of inorganic fibers include glass fibers, carbon fibers, and fiber boron, and examples of organic fibers include various natural fibers and various synthetic fibers. The conductive fiber is preferably carbon or graphite fiber that can generate heat.

  Therefore, in the present invention, various effects other than the hormesis effect, far-infrared effect, negative ion effect, and magnetic effect can coexist in one composite intermediate material or in one final plate. It can be provided in an intermediate material and mixed, or it can be provided in each layer and laminated. That is, the present invention includes a low-dose radiation rough powder, and is composed of a total of 60 to 85% by weight and a thermoplastic resin 40 to 15% by weight together with the inorganic powder and / or the inorganic fiber, and the low radiation rough powder is an inorganic powder. And / or a hormesis composite material layer uniformly dispersed in a matrix made of a thermoplastic resin together with inorganic fibers, an inorganic powder and / or inorganic fibers 60 to 85% by weight, and a thermoplastic resin 40 to 15% by weight, A bedrock bath plate comprising an inorganic layer in which inorganic powder and / or inorganic fibers are uniformly dispersed in a matrix made of a thermoplastic resin, and capable of exerting a hormesis effect and other effects, for example, a far-infrared effect. It is also something to offer. In that case, it is preferable that the inorganic powder or the inorganic fiber is made of conductive carbon and includes a layer having an electric resistance heating ability.

  In the present invention, as the thermoplastic resin, various thermoplastic resins may be selected according to the use, and the thermoplastic resin is adjusted in relation to the filling material type, dimensions, filling amount and the like. It is preferable to use PP (polypropylene), PC (polycarbonate) polyamide resin, etc. suitable for the structural material in consideration of heat resistance, water resistance, rigidity, etc. as the rock bath plate exhibiting the hormist effect. Moreover, in order to improve kneadability with a filling material, two or more thermoplastic resins that are compatible can be blended and adjusted.

  The molded article molded in accordance with the present invention is preferably colored, 40 to 15 wt% transparent or translucent thermoplastic with respect to one or more colored 60 to 85 wt% hormesis rough powder raw material. It is preferable to prepare a crushed piece of a hormesis raw stone powder reinforcing material obtained by kneading and solidifying a resin, and coloring the hormesis raw stone powder raw material. It is also possible to prepare a crushed piece of a hormesis gemstone-containing material obtained by kneading and solidifying a thermoplastic resin colored in the same system with a colored hormesis gemstone powder raw material, and the crushed piece is two or more kinds of different colored materials Can be.

  Another feature of the present invention is that a kneaded and solidified composite material is pulverized or crushed, filled with air in a mold, heated and pressurized to produce a thin sheet, a slightly thick plate-shaped or three-dimensional composite resin molded product. It is in the point which was made to do. If the filler contains moisture, it may be heated with another heat source to evaporate the contained moisture before kneading with the molten matrix resin, or the molten matrix resin and a plurality of hormesis rough powders are kneaded. In this case, the hormesis rough stone powder may be heated by the heat of the matrix resin to evaporate the water content of the hormesis rough stone powder. If it does in this way, the drying process of reinforced hormesis rough stone powder is not required separately, and a manufacturing process can be simplified.

  When recycling a used hormesis gemstone powder material, the collected hormesis gemstone powder material has an appropriate size, for example, a size that allows the three-dimensional shape of the hormesis gemstone powder to remain, for example, a size of 5 mm to 20 mm on a side. The matrix resin can be crushed and heated by an appropriate heat source to soften or melt the matrix resin, and if necessary, the matrix resin can be added and used as all or part of the raw material of the hormesis raw stone powder material.

  When forming a surface resin layer on a molded product, it may be formed by stacking a softened or melted synthetic resin material on the surface of a composite resin molded product, or by stacking synthetic resin films, sheets or plates. You can also The surface resin layer of the composite resin molded product may be formed on the entire outer surface of the composite resin molded product, or may be formed only on a part of the outer surface, for example, the upper surface or the lower surface of the plate-shaped composite resin molded product.

  Molded products can be molded by pressing into a predetermined product shape by forming a surface resin layer, but a synthetic resin film, sheet, or plate is laminated on the surface of a composite resin molded product, or a softened or melted synthetic material When the resin materials are stacked, they can be formed into a predetermined product shape. For molding this composite resin molded product, a die, a roller, or the like is used, and drawing molding, bending molding, vacuum molding, pressure molding, match molding, or the like can be employed.

  The synthetic resin film, sheet or plate and the composite resin molded product may be bonded to each other by an adhesive, and bonded to each other depending on the affinity between the matrix resin of the composite resin molded product and the synthetic resin material of the surface resin layer. You may make it do.

  The preferred embodiments of the present invention are listed as follows.

  1 type or 2 or more types which knead | mixed and solidified 40-15 weight% of thermoplastic resin with respect to 60-85 weight% in combination including the low-dose radiation raw powder, the far-infrared radiation inorganic powder, and / or the magnetic powder. A step of preparing one or two or more composite intermediate raw materials by crushing or crushing the composite material, a step of filling the one or two or more composite intermediate raw materials into a predetermined mold, and a mold A method for forming a hormesis composite material comprising a step of heating and pressurizing one or more composite intermediate materials densely packed therein to integrate them. Thereby, the far-infrared effect or the magnetic field effect can be used in combination with the hormesis effect.

  Two or more kinds of composite intermediate materials are used, and each composite intermediate material is mainly composed of low-dose radiation rough powder, and 40 to 15% by weight of thermoplastic resin is kneaded with 60 to 85% by weight of filler to solidify. The hormesis effect composite material formed by pulverizing or crushing the composite material and the inorganic powder for far-infrared radiation are the main components of the filler, and 40 to 15% by weight of the thermoplastic resin is kneaded with 60 to 85% by weight of the filler. The composite material for far-infrared radiation formed by pulverizing or crushing the solidified composite material and the magnetic material powder as a main component of the filler, thermoplastic resin 40 to 15% by weight with respect to 60 to 85% by weight of the filler This is a combination of two or more selected from a magnetic material composite material formed by pulverizing or crushing a composite material solidified by kneading. Thereby, the combination of the optimal value of various effects can be made easy.

  The composite intermediate material contains low-dose radiation raw powder and other inorganic powders and / or organic / inorganic fibers, and these are combined and kneaded with 40 to 15% by weight of thermoplastic resin to 60 to 85% by weight. A molding method comprising one or two or more composite intermediate materials obtained by pulverizing or crushing one or more composite materials, and having different colors. Thereby, the hormesis effect can be given to the wall and flooring which have the decoration effect of the artificial marble style.

  In the step of filling in the mold, a pair of molds are provided with an inlet for introducing one or more composite intermediate materials together with an air stream, while an air stream outlet is provided in the other direction of the mold, A molding method in which a composite intermediate material is introduced into a molding die together with an air flow, exhausted from below, and the composite intermediate material is sequentially deposited and filled in the molding die from downstream to upstream. Thereby, various moldings can be automated.

  In the step of filling into the mold, the inside of the mold formed by the pair of molds is decompressed, and in this state, the material inlet is opened and one or more composite intermediate materials are sucked and filled into the mold. Molding method. Thereby, various moldings can be automated.

  According to the present invention, the low-dose radiation raw powder is 100 to 10,000 times the natural radiation, and the total amount of the inorganic powder and / or the organic / inorganic fiber is 60 to 85% by weight and the thermoplastic resin is 40 to 15%. And a hormesis composite material in which a low radiation rough powder is uniformly dispersed in a matrix made of a thermoplastic resin together with an inorganic powder and / or an organic inorganic fiber component.

  By using aluminum hydroxide as the inorganic powder and constituting different colored composite intermediate raw materials, and using this, the final product can constitute an artificial marble board.

  The inorganic powder contains far-infrared radiation powder or magnetic powder, is made of different composite intermediate materials, and is interspersed in the final composite material, so that the artificial marble plate can exhibit far-infrared effect or magnetic field effect other than hormesis.

  By using chemical fibers or natural fibers and randomly dispersing and dispersing the fiber directions in the composite material matrix, the sheet-form hormesis composite material can have a predetermined tensile strength excellent in flexible performance.

  By using a paper pulp component as a fiber component, the final product can be configured as a synthetic paper sheet, and wallpaper or the like can have a hormesis effect.

  The low-dose radiation raw powder and the inorganic powder and / or the inorganic fiber are combined to form 60 to 85% by weight and the thermoplastic resin 40 to 15% by weight, and the low-radiation raw stone powder, the inorganic powder and the inorganic fiber are made of the thermoplastic resin. Comprising a hormesis composite material layer uniformly dispersed in a matrix, inorganic powder and / or inorganic fiber 60 to 85% by weight and thermoplastic resin 40 to 15% by weight, wherein the inorganic powder and / or inorganic fiber is thermoplastic. A bedrock bath plate comprising an inorganic layer uniformly dispersed in a resin matrix. By synthesizing the hormesis composite material plate and the far-infrared composite material plate, the synergistic effect of both can be exhibited.

  When a powder or fiber made of conductive carbon or graphite is blended as the inorganic powder or the inorganic fiber to give electric resistance heating performance, the far-infrared radiation effect can be easily exhibited.

Hereafter, the manufacture example of this invention is demonstrated.
(Production Example 1)
FIG. 1 shows a preferred embodiment of a method for producing a renewable hormesis rough powder reinforced resin product according to the present invention. When producing a hormesis rough powder reinforced resin product, a hormesis rough powder material is prepared. Although this hormesis rough stone powder can also be made into a nanoparticle powder, a powdery powder having an average outer diameter of 10 μm to 35 μm is usually used. Also, a thermoplastic resin, for example, a thermoplastic resin such as chip-shaped polypropylene or polyethylene having an appropriate size is prepared. These resins may be one kind or a mixture of two kinds.

  On the other hand, the heater of the kneading machine 10 is operated, and the inside of the kneading machine 10 is raised to a melting temperature of the thermoplastic resin, for example, a temperature in the range of 100 ° C. to 300 ° C., and FIG. As shown, the crushed thermoplastic resin chips are put into the kneader 10 and melted with stirring. Binder resin chips may be charged at once, or may be divided into a plurality of times. When heat is generated by stirring the molten resin by rotation of the stirring blade during melting of the binder resin, the heating temperature by the heater may be slightly lower than the melting temperature of the binder resin.

  When the thermoplastic resin is sufficiently softened or melted, the prepared hormesis ore powder raw material, for example, radium ore powder, is charged into the kneader 10 at one time or divided into a plurality of times, and carbon powder and / or as other fillers The fibers are put into the kneader 10 at one time or divided into several times, and the softened and melted thermoplastic resin, the raw radium powder and the carbon powder (30% by weight: 35% by weight: 35% by weight) are substantially uniform. Knead so that If a large amount of filler is added at a time, the temperature of the softened and melted resin may decrease, so the raw material of the hormesis ore powder material is preliminarily heated to a suitable temperature with a heater or the like before being added to the kneader 10. You may heat to.

  Further, if the thermoplastic resin is heated for a long time in a molten state, the original physical properties of the resin may be impaired. Therefore, it is preferable to complete the kneading in a short time after sufficiently melting. According to the experiments of the present inventors, it has been found that the time from melting to completion of kneading is preferably about 5 to 30 minutes. However, the optimum time varies depending on the heating temperature and the physical properties of the thermoplastic resin. Should be obtained by experimentation.

  When sufficient kneading is completed, as shown in FIGS. 1B and 1C, the kneaded product 20 is taken out and crushed into an appropriate size by a crusher 11, for example, a scale having a side of 3 mm to 40 mm. To do. The size of the crushed piece 21 is not particularly limited because it is made to flow by pressurization in a later process, but it is preferable to have a shape that easily floats in the air flow because it is placed in the air flow and filled in the mold. It is important to make the whole air permeable.

  Similarly, as shown in FIG. 1 (d), different colored pieces, for example, white, blue, red and yellow fragments 21 are produced. In the above production example, one type of composite intermediate material was used, but at the same time, a second composite material 20 ′ having a different composition was formed using the second kneader 10 ′, and the composite intermediate material crushed from this was mixed. May be.

  When the crushed pieces 21 having a plurality of colors are thus obtained, the exhaust ports 32 are formed in the mold surrounded by a pair of heated molds 30 and 31 as shown in FIG. 1 (e). The composite intermediate material is sucked and filled from the upper filling port 33 and heated and pressurized at that position. Then, the thermoplastic resins having different colors are integrated and compressed (compression ratio L / 4 to 5) while flowing, and when the temperature is lowered and taken out and the surface is polished, the result is shown in FIG. As a result, an artificial marble patterned hormesis product 40 that can be thought of as a polished surface pattern with the resin layer 41 formed on the surface is obtained.

  In the present invention, in the step of filling the molding die so that the crushed pieces can be filled in the molding die by being placed on the air stream, the upper side of the molding die is used as the air flow inlet, while the lower side of the molding die is A composite intermediate material that is permeable to the air flow is introduced into the mold together with the air flow and exhausted from below, and the intermediate material is sequentially deposited from below to above in the mold to be filled. . Specifically, for example, a cyclone method may be used in which crushed pieces are suspended in a rotating air stream as a filling machine, and are sequentially sent out and accumulated.

  On the other hand, it is also effective to use a method in which the inside of the mold is evacuated and a part of or the whole of the crushed piece of a single molding is filled under reduced pressure.

(Production Example 2)
In Production Example 1, an equal amount of hormist stone powder and carbon powder was blended with thermoplastic resin, but a first composite material plate was blended with 70 wt% hormist stone powder with respect to 30 wt% thermoplastic resin, A bedrock bath plate was prepared in the same manner as in Production Example 1 except that it was superposed on a second composite material plate containing 70% by weight of carbon powder with respect to 30% by weight of thermoplastic resin and joined to form a single plate. To manufacture.

(Production Example 3)
A bedrock bath plate is produced in the same manner as in Production Example 1 except that 30% by weight of raw hormist stone powder, 20% by weight carbon powder, and 20% by weight carbon fiber are blended with 30% by weight thermoplastic resin. This plate was electrically conductive and could be heated by electric resistance when energized.
Therefore, it is effective when the far infrared effect is exhibited simultaneously with the hormist effect.

(Production Example 4)
A first composite material plate is prepared by blending 70% by weight of hormist ore powder with respect to 30% by weight of thermoplastic resin, while a second composite material plate with 70% by weight of carbon powder blended with 30% by weight of thermoplastic resin, Similar to Production Example 1, except that a third composite material plate was prepared by blending graphite powder and 70% by weight of fiber with 30% by weight of thermoplastic resin, superposing these and joining them into one plate. To make a rock bath plate. The third plate showed electrical conductivity and could be heated by electric resistance when energized. Therefore, it is effective when the far-infrared effect is exhibited simultaneously with the hormist effect.

(Production Example 5)
A hormist magnetic composite material plate is prepared by blending 35% by weight of hormist ore powder and 35% by weight of magnetic powder with respect to 30% by weight of thermoplastic resin. The magnetic powder is uniformly kneaded with the resin, and the magnetic powder is not magnetized, but is first kneaded with the hormist ore powder and kneaded with the resin. On the other hand, a far-infrared effect composite material plate in which 70% by weight of carbon powder is blended with 30% by weight of thermoplastic resin, and a conductive composite material plate in which graphite powder and 70% by weight of fiber are blended with 30% by weight of thermoplastic resin are manufactured. Then, a bedrock bath plate is produced in the same manner as in Production Example 1 except that these are superposed and joined to form one plate. The third plate showed electrical conductivity and could be heated by electric resistance when energized. Therefore, it is effective when the far infrared effect is exhibited simultaneously with the hormist effect.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows typically 1st Embodiment of the manufacturing method of the hormesis raw stone powder reinforced resin molding which concerns on this invention.

Explanation of symbols

10, 10 'kneading machine 11 crusher 20, 20' composite material 21 shredded piece 30, 31 mold 40 composite material product

Claims (13)

  1 type or 2 which knead | mixed and solidified 40-15 weight% of thermoplastic resins with respect to 60-85 weight% combining these low-dose radiation raw stone powder and other inorganic powder and / or organic inorganic fiber part A step of pulverizing or crushing one or more composite materials to prepare one or more composite intermediate materials, a step of filling the one or more composite intermediate materials in a predetermined mold, and A method for forming a hormesis composite material, comprising a step of heating and pressurizing and integrating one or more composite intermediate materials densely packed in a mold.   The shaping | molding method of Claim 1 in which 1 type of a composite intermediate raw material contains a low-dose radiation raw stone powder, a far-infrared radiation inorganic powder, and / or a magnetic powder.   Two or more of the composite intermediate raw materials have at least a low-dose radiation raw powder as a main component of the filler, and a composite material obtained by kneading and solidifying 40 to 15% by weight of a thermoplastic resin with respect to 60 to 85% by weight of the filler is ground or A composite material obtained by crushing and forming a hormesis effect composite material and a far infrared radiation inorganic powder as a main component of a filler, and kneading 40 to 15% by weight of a thermoplastic resin with respect to 60 to 85% by weight of the filler. The composite material for far-infrared radiation formed by pulverizing or crushing the powder and the magnetic material powder as the main component of the filler, kneading and solidifying 40 to 15 wt% of the thermoplastic resin to 60 to 85 wt% of the filler 2. The molding method according to claim 1, wherein the molding method is a combination of two or more magnetic material composite materials formed by pulverizing or crushing the composite material.   The composite intermediate material contains low-dose radiation raw powder and other inorganic powders and / or organic / inorganic fibers, and these are combined and kneaded with 40 to 15% by weight of thermoplastic resin to 60 to 85% by weight. The shaping | molding method of Claim 1 which is 1 type, or 2 or more types of composite intermediate materials formed by grind | pulverizing or crushing 1 type, or 2 or more types of composite materials, and has different coloring.   In the step of filling in the mold, a pair of molds are provided with an inlet for introducing one or more composite intermediate materials together with an air stream, while an air stream outlet is provided in the other direction of the mold, 2. The method of forming a hormesis composite material according to claim 1, wherein the composite intermediate material is charged together with the air flow into the forming die and exhausted from below, and the composite intermediate material is sequentially deposited and filled in the forming die from downstream to upstream of the air flow.   In the step of filling into the mold, the inside of the mold formed by the pair of molds is decompressed, and in this state, the material inlet is opened and one or more composite intermediate materials are sucked and filled into the mold. A method for forming a hormesis composite material according to claim 1.   It contains low-dose radiation raw powder 100 to 10,000 times that of natural radiation, and is composed of a total of 60 to 85% by weight together with inorganic powder and / or organic / inorganic fibers, and 40 to 15% by weight of thermoplastic resin. A hormesis composite material in which a raw radiation powder is uniformly dispersed in a matrix made of a thermoplastic resin together with an inorganic powder and / or organic inorganic fibers.   8. The composite material according to claim 7, wherein the inorganic powder contains aluminum hydroxide, forms different colored composite intermediate materials, and the final product constitutes an artificial marble board.   The hormesis composite material according to claim 7, wherein the inorganic powder includes far-infrared radiation powder or magnetic powder, forms a different composite intermediate material, and is scattered in the final composite material.   The hormesis composite material according to claim 7, wherein the organic / inorganic fiber component is a chemical fiber or a natural fiber, and is dispersed in the composite material matrix by randomly crossing the fiber directions.   The hormesis composite material according to claim 7, wherein the fiber component comprises a paper pulp component and the final product constitutes a synthetic paper sheet.   The low-dose radiation raw powder and the inorganic powder and / or the inorganic fiber are combined to form 60 to 85% by weight and the thermoplastic resin 40 to 15% by weight, and the low-radiation raw stone powder, the inorganic powder and the inorganic fiber are made of the thermoplastic resin. Comprising a hormesis composite material layer uniformly dispersed in a matrix, inorganic powder and / or inorganic fiber 60 to 85% by weight and thermoplastic resin 40 to 15% by weight, wherein the inorganic powder and / or inorganic fiber is thermoplastic. A bedrock bath plate comprising an inorganic layer uniformly dispersed in a resin matrix.   The bedrock bath plate according to claim 7, wherein the inorganic powder or the inorganic fiber is made of conductive carbon or graphite, has an electric resistance heating performance, and has a far infrared radiation effect.

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