JPS62297359A - Light-transmitting high-density material - Google Patents

Abstract

PURPOSE:To obtain a light-transmitting and high-density material useful as sound-insulating sidewalls for automobile expressways, etc., by containing lead oxide and barium oxide and compounding the resultant amorphous or microcrystalline light-transmitting inorganic material with a light-transmitting resin component. CONSTITUTION:A light-transmitting and high-density material obtained by compounding (A) a light-transmitting amorphous or microcrystalline inorganic material prepared by blending a light-transmitting inorganic material with (i) lead oxide and/or (ii) barium oxide with (B) a light-transmitting resin component, e.g. (poly)alkyl methacrylate, etc. The amount of the blended components (i) and/or (ii) is preferably 12-95wt%.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is applicable to, for example, sound insulation side walls of expressways and railways, high energy radiation shielding walls of nuclear power generation facilities, etc. The present invention relates to a transparent high-density material useful for.

[Conventional technology]

Conventionally, the materials used for sound insulation walls have often been non-transparent (i.e., they cause mental pressure and fatigue on drivers and passengers on highways, etc., and these effects increase rapidly with driving time). Met.

In order to solve these problems, several types of light-transmitting sound insulation materials have been developed.9 For example, a type of material in which light-transmitting ordinary plate glass is composited with a resin adhesive layer of a specific composition is used. This is a type that attempts to increase the sound insulation effect by combining translucent resin plates.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional translucent sound insulation materials, the density of the laminated translucent plates themselves is low, so in order to achieve the necessary sound insulation effect, the thickness of the plates must be considerably thickened, and multiple layers must be used. There was a problem in that it required time and effort to laminate the plates and was not economically viable.

Therefore, as shown in Japanese Patent Application Laid-Open No. 61-28542, a light-transmitting material is provided in which a lead compound is mixed into a single light-transmitting resin plate and molded therein. However, this translucent material develops translucency as an ionomer resin by mixing a lead compound with a thermoplastic resin containing carboxylic acid or carboxylic acid anhydride and causing a neutralization reaction with lead ions. Therefore, there is inevitably a limit to the amount of lead compounds that can be added, and the sound insulation performance is insufficient, and if a large amount of lead compounds is mixed in beyond the neutralization reaction, the light transmittance will decrease significantly. was there.

The present invention eliminates the above-mentioned drawbacks, and its purpose is to prevent the translucency from decreasing even if a large amount of lead oxide or barium oxide, which is a high-density component, is mixed. To provide an economical light-transmitting high-density material that can be mixed with a material to increase the sound insulation effect, and also exhibit sufficient sound insulation performance without increasing the wall thickness as in the past. be.

[Means for solving problems]

That is, the characteristic configuration of the translucent high-density material according to the present invention is as follows:
It consists of a translucent inorganic material containing lead oxide, barium oxide, or both components, which has been made amorphous or microcrystalline, and is combined with a translucent resin component, and its functions and effects are as follows: It is as follows.

[For production]

Since the amorphous or microcrystalized translucent inorganic material containing lead oxide, barium oxide, or both components is combined with the translucent resin component, a large amount of lead oxide or barium oxide can be used. Even if lead oxide or barium oxide is mixed in, the light transmittance will not be significantly reduced, and it becomes possible to mix a large amount of lead oxide or barium oxide while ensuring light transmittance.

〔Effect of the invention〕

Therefore, it has become possible to economically obtain a transparent high-density material with excellent both light-transmitting and sound-insulating properties.Furthermore, this transparent high-density material also has an excellent radiation shielding effect, making it suitable for industrial use. Transparent radiation shielding plates can now be provided that can be used simply and economically in industrial nuclear power plants, test and research nuclear reactors, medical and research high-energy radiation generators, and the like.

〔Example〕

The present invention will be explained in detail below.

The inorganic material used in the present invention is an amorphous or microcrystalized light-transmitting material containing lead oxide, barium oxide, or both components, and other components include boron oxide and aluminum oxide. , oxides of Group 3 to 5 elements such as silicon oxide and phosphorus oxide, and oxides of Group 2 elements and transition metal elements such as zinc oxide, cadmium oxide, iron oxide, cobalt oxide, and nickel oxide. It can contain more than one species.

The content of lead oxide, barium oxide, or the sum of both components in the inorganic material is 12 to 95% by weight, and when the content is less than 12% by weight, the sound insulation performance and high-energy radiation shielding performance are improved. 9.
If it exceeds 5% by weight, the inorganic material becomes difficult to become amorphous. Further, one or more of the glass network-forming oxides such as boron oxide, silicon oxide, and phosphorus oxide, and glass network-modifying oxides or intermediate oxides such as alkali metal oxides, alkaline earth metal oxides, and aluminum oxides. The total amount is preferably 5 to 88% by weight. After heating and melting these various blended components, they are molded into an appropriate shape such as a plate or plate-like piece, granule or fiber to obtain an amorphous or microcrystalline inorganic material.

This inorganic material is colorless and transparent to yellow and transparent, and by adding a small amount of components such as iron oxide, cobalt oxide, nickel oxide, etc., it can be changed to the color tone characteristic of these oxides.

The inorganic material having the above composition range exhibits sufficient stability in the atmosphere, and by blending with various translucent resin components and molding, a translucent high-density material can be obtained.

Examples of the light-transmitting resin component include (poly)alkyl methacrylate, polyolefin such as polystyrene, polyethylene, polycarbonate, polyvinyl acetate, polyester, epoxy resin, and various other heat-transmitting resins. Plastic resins and thermosetting resins can be used.

Next, the present invention will be specifically explained based on examples.

[Example 1] Is the appearance the specific gravity? , Q and a thickness of 0.2 ** The above amorphous plate-shaped transparent inorganic material is composited with (poly)alkyl methacrylate by a solution method or a thermoforming method so that it is arranged in a substantially single layer. Sa0.24+a+
A plate-like translucent high-density material having an apparent specific gravity of 6.3 was obtained. As a result of measuring the sound insulation performance and visible light transmittance of this translucent high-density material, it was found that the sound insulation performance (average characteristics for frequencies 125 to 4.000 Hz) is equivalent to approximately 80% of that of a steel plate of the same thickness, and the visible light The transmittance was about 85%. At this time, (poly)
Almost similar results were obtained using resins other than alkyl methacrylate. Furthermore, by treating the inorganic material with a surface treatment agent such as chlorosilane or chromic acid methacrylate before being combined with the resin, long-term storage stability in the atmosphere (humid air) and affinity with the resin can be improved.

[Example 2] A plate-shaped piece of a transparent inorganic material prepared with an apparent specific gravity of 6.3 and a thickness of 0.6 mm was oriented to form an average of 1.5 layers and then composited with polyethylene. By molding, a translucent high-density material with a plate thickness of 3.0 mm was obtained. This translucent high-density material and thickness 0
．． 3U plate-like inorganic material (apparently, specific gravity is the same as above)
Comparing a light-transmitting high-density material (same thickness as above) composite molded with polystyrene so that the particles are oriented in three layers on average, the latter has a slightly better sound insulation effect, but the light-transmitting decreased. The above appearance is an inorganic material with specific gravity with a diameter of 0.
．． The same tendency as above is also found when the particles are made into particles with a size of 1 to 1.5 fl and fibers with a diameter of 10 to 30 μm are composited with polystyrene.

[Example 3] After mixing an amorphous plate-shaped transparent inorganic material with an apparent specific gravity of 7.4 and a thickness of 0.5 mm with a liquid epoxy resin, an amine as a curing agent was added to form a plate-shaped material. or mixed with liquid epoxy resin and amine and then immediately composited with a plate-shaped inorganic material and cured into a plate shape, where the inorganic material is 45% by volume based on the cured resin.
The board thickness is 3. A translucent high-density material of On was obtained. Sound insulation properties of the obtained translucent high-density material (frequency 12
5 to 4,000 Hz) was comparable to the sound insulation performance of a 1.60-thick steel plate commonly used for opaque sound insulation walls. At this time, even when a particulate inorganic material of the same quality with a diameter of 0.1 to 1.0 mm was used in place of part or all of the plate-like inorganic material, similar sound insulation performance was obtained. Furthermore, the cured epoxy resin is molded into a plate with a reduced amount, and one or both sides of the plate are bonded with polypropylene, or the surface is bonded with other plate or film resin such as oxidized polypropylene. The translucent high-density material also showed almost the same sound insulation performance as the above one.

[Example 4] Furthermore, the performance of a shielding material against high-energy radiation, for example, γ-rays, can be expressed as lead equivalent (DPb) using data regarding the γ-ray absorption ability. Material (apparent specific gravity 7.0, thickness 0.9m)
Among the translucent high-density materials obtained by compounding with resin, those with an apparent specific gravity of 6.3 and a thickness of 2.0 mm have a visible light transmittance of about 70% and are suitable for radiation shielding. The performance was equivalent to a lead equivalent of 1.03 mPb, and was effective for radiation protection and work management.

Claims (7)

[Claims] (1) A transparent material comprising a translucent inorganic material containing lead oxide, barium oxide, or both components and made into an amorphous or microcrystalline material and a translucent resin component. Light-sensitive high-density material. (2) The transparent high-density according to claim 1, wherein the inorganic material contains at least one type of oxide of Group 2 to Group 5 elements and oxide of transition metal element. Material. (3) The transparent material according to claim 1 or 2, wherein a treated layer for improving affinity with the transparent resin component is formed on the surface of the inorganic material. Light-sensitive high-density material. (4) The translucent high-density material according to any one of claims (1) to (3), wherein the inorganic material is formed in a plate shape or a plate-like piece. (5) The translucent high-density material according to any one of claims (1) to (3), wherein the inorganic material is formed in a fibrous shape. (6) The translucent high-density material according to any one of claims (1) to (3), wherein the inorganic material is formed in a granular form. (7) The highly transparent inorganic material according to any one of claims (1) to (5), wherein the inorganic material is dispersed in a transparent resin component in an oriented state. Density material.