JP3022747U - Lightweight ceramic particles - Google Patents

Abstract

(57) [Summary] [Object] To provide lightweight ceramic particles in which the surface of ceramic fine hollow particles composed of only completely hollow particles is coated with a ceramic composition. [Structure] Using ceramic fine hollow particles having a compressive strength of 600 kgf / cm ² or more and a bulk specific gravity of 0.3 to 0.5 g / cm ^{3 and a} melting point of 1500 ° C. or more, without being destroyed during the process,
Light-weight ceramic particles are prepared by kneading and mixing a fine powdery ceramic composition having a size of 44 μm or less or a colored ceramic composition obtained by adding an inorganic pigment thereto and water with a tumbling mill.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a lightweight ceramic used as a material for building and civil engineering materials such as outer wall materials, floor materials, ceiling materials, roof materials, sound absorbing materials, and water-permeable pavement materials used in buildings and as catalysts and adsorbents. It relates to Mick particles.

[0002]

[Prior art]

 Heretofore, there have been the following techniques for coating a ceramic composition on a fine balloon or fine foam. That is, as the fine balloons as a base material, there are shirasu balloons, glass balloons, silica balloons, fly ash balloons and the like coated, and fine foamed pearlite and the like, which were coated with a ceramic composition. It is a thing.

However, even if these are coated with a ceramic composition, the fine balloon-like or fine foam-like material as a base material has low pressure resistance and can be made of lightweight hollow ceramic particles only. There wasn't. For example, the pressure-resistant strength of shirasu balloon is only about 80 kgf / cm ² , and the completely hollow particles are less than half of the whole. Therefore, there was no point in coating the ceramic composition. Existing inorganic balloons such as glass balloons, silica balloons, and fly ash balloons have a compressive strength of about 200 to 300 kgf / cm ^2, so they were considerably destroyed during the ceramic composition coating process, and were composed only of completely hollow particles. It was not possible to make lightweight ceramic particles.

It is impossible to coat the ceramic composition with a uniform thickness because the base material, such as pearlite and foam aggregate, which are finely foamed, is porous and has an open pore surface. . The foamed aggregate made of obsidian could have closed pores on its surface, but could not form fine particles and could not be reduced in weight because it had partition walls inside.

[0005]

[Problems to be solved by the device]

 The present invention provides a lightweight ceramic particle coated with a ceramic composition composed of only completely hollow particles, which is not possible with the conventional fine balloon-shaped or finely foamed shape as described above. It is intended.

[0006]

[Means for Solving the Problems]

In order to solve the above problems, by using ceramic fine hollow particles having a compressive strength of 600 kgf / cm ² or more, a bulk specific gravity of 0.3 to 0.5 g / cm ³ , and a melting point of 1500 ° C. or more, 44 μm without being destroyed during the process. Light-weight ceramic particles could be produced by kneading and mixing the following fine powdery ceramics composition or a colored ceramics composition in which an inorganic pigment of 44 μm or less was mixed with water and a ceramics composition in a rolling mill. Of.

[0007]

[Action]

 The ceramic fine hollow particles used in the present invention have particularly high compressive strength as compared with conventional fine hollow foams, and can withstand the high stress and shearing force generated in the ceramic composition coating process. Is something that can be done. Furthermore, by compacting with lightweight ceramic particles as a material, it is possible to obtain a dense foam ceramic molded plate despite its light weight.

The compressive strength of the fine hollow foam is synonymous with the hydrostatic strength, and the compressive strength is measured by pressurizing the fine hollow foam in water and transmitting the pressure applied to the water to the fine hollow foam. The pressure at which the hollow foam breaks is the compressive strength.

Light weight ceramic particles coated with a ceramic composition capable of exhibiting excellent performance must have a sufficient kneading and stirring process, and are particularly important for uniform quality and lightweight ceramic particles of good quality. is there. When sufficient kneading and stirring are performed, the stress and shearing force applied to the ceramic fine hollow particles during the kneading are said to be about 400 kgf / cm ² . There are no conventional hollow microfoams for building materials that can withstand such high pressure, and most of them are destroyed.Therefore, there was no one that could be used as such a lightweight ceramic particle and could not obtain sufficient performance. is there.

When the ceramic fine hollow particles are coated with a ceramics composition to form lightweight ceramic particles, which are used as a material for building materials and the like, thermal conductivity is important. It depends on the particle size of the micro hollow foam, which is generally around 0.1 (kcal / mhr ° C.), and when half of the filled micro hollow foam is destroyed, the thermal conductivity is about 0.2 (kcal). / Mhr ° C.). The excellent effect is obtained only when a completely fine hollow foam which is not broken is used. The ceramic fine hollow particles used in the present invention have significantly higher compression strength than conventional fine hollow foams such as Shirasu balloon, glass balloon, silica balloon, and fly ash balloon, and are lightweight ceramic particles. The hollow body of is 100% complete. As described above, the compressive strength of the conventional fine hollow foam is 80 to 300 kgf / cm ² .

The melting point of the ceramic fine hollow particles used here is 1500 ° C. or higher. Naturally, the ceramic fine steel hollow particles are due to their material, but generally, the higher the melting point, the higher the compressive strength. If the compressive strength is 600 kgf / cm ² or more, the melting point is 1500 ° C. or more.

When the lightweight ceramic particles are used in a building material or the like, they are filled in a predetermined mold, pressure-molded, and then fired. The firing temperature is 700 to 1300 ° C., which varies depending on the melting point depending on the type of the ceramic composition which is the coating material used. In order to use lightweight ceramic particles as a material for building materials, the ceramic fine hollow particles coated with the ceramic composition are joined at points to firmly bond them. The ceramic composition is melted, and the ceramic fine hollow particles are fixed by this melt to form a foamed ceramic molded plate. However, the ceramic fine hollow particles should not be melted during firing, and the strength should not be reduced by heating. Therefore, the melting point of the ceramic fine hollow particles must be 1500 ° C. or higher.

The ceramic fine hollow particles used are formed by foaming a composition comprising 40 to 45% of alumina, 50 to 60% of silica, and 1.5 to 2.5% of others, and the physical properties thereof are compressive strength of 700 kgf / cm. ² , a melting point of 1600 to 1800 ° C., a bulk specific gravity of 0.3 to 0.5 g / cm ³ , and a thermal conductivity of 0.1 (kcal / mhr ° C.), and is composed of only complete hollow particles. The fine ceramic hollow particles have a particle size in the range of 12 to 350 μm, and are mixed and used by adjusting the particle size so as to have fine 12 to 75 μm, medium 75 to 150 μm, and coarse 150 to 350 μm. The bulk specific gravity is heavier for finer particles and lighter for coarser particles. Therefore, the range of bulk specific gravity is 0.3 to 0.5 g / cm ³ .

When a ceramic composition for coating light weight ceramic particles is used, the melting point of the ceramic composition can be lowered and various physical properties can be improved by adding various fluxes. it can. As the flux, any one kind or two or more kinds of feldspar, limestone, magnesium carbonate, lime phosphate, lead oxide, boric acid, borax, sodium carbonate, zinc oxide and the like are added. All of them use fine powder particles of 44 μm or less.

The ceramic composition means B ₂ O ₃ , SiO ₂ , GeO ₂ , ZrO ₂ , P ₂ O ₅ , As ₂ O ₅ , Sb ₂ O ₃ , Bi ₂ O ₃ , P ₂ O ₃ , and Sb ₂ O. Acidic oxides such as ₅ and SO ₃ include basic oxides such as Na ₂ O, K ₂ O, CaO and MgO and Al ₂ O ₃ , Fe ₂ O ₃ , ZnO, PbO and TiO ₂ . For two or more in any one or more of which, such as, for example, _{SiO 2 -Na 2 O-B 2} O 3, S iO 2 -Na 2 O-CaO, SiO 2 -K 2 O-CaO, _{Al 2 O 3 -SiO 2 -Na 2} O-CaO-B 2 O 3, Al 2 O 3 -SiO 2 -TiO 2 -CaO-B 2 O 3, CaO-SiO 2 -Al 2 O 3 -Fe 2 O ₃ , SiO ₂ —Al ₂ O ₃ —K ₂ O, etc., or any one or more of them, or / and natural materials such as kaolin, plastic clay (frog eyes clay, kibushi clay, ball clay, etc.), sericite. , Porcelain stone, wax stone, bentonite, silica stone, chamotte, feldspar, limestone, magnesite, dolomite, wollastonite, talc, bone ash, etc. Any one kind or a combination of two or more kinds thereof is used. All of them use fine powders of 44 μm or less.

The fine ceramic particles have fine, medium, and coarse particle sizes adjusted, and 10 to 300 parts by weight of the ceramic composition is added to 100 parts by weight. When the amount of the ceramic composition is 10 parts by weight or less, the ceramic fine hollow particles cannot be completely coated, and when it is 300 parts by weight or more, the amount is too large to make it difficult to form a uniform thickness coating.

In addition to the ceramic fine hollow particles and the ceramic composition, water and, if necessary, a material serving as a flux and other additives such as a dispersant, a thickener, a stabilizer, and an aqueous binder are added. The fineness of the ceramic fine hollow particles is adjusted to 6% for fineness, 59% for medium grain and 35% for coarse grain. The coating thickness of the ceramic composition on the ceramic fine hollow particles can be arbitrarily adjusted by the mixing time.

Examples of the inorganic pigment of 44 μm or less mixed in the ceramic composition include cobalt pigment, iron pigment, chromium pigment, manganese pigment, copper pigment, vanadium pigment, mercury pigment, lead pigment, sulfide pigment, selenide pigment, etc. So, for example, aureolin (yellow), cobalt green (green), cerulean blue (sky blue), cobalt blue (blue), cobalt bioreet (purple), ocher (yellow), schner (cut color), red iron oxide (red), pull Cyan blue (blue), chrome oxide (green), yellow lead (yellow), viridian (green), mineral violet (purple), emerald green (green), vanadium yellow (yellow), vanadium blue (blue), shu ( Red, red lead (red), cadmium yellow (yellow), ultramarine (blue), cadmium red (red), carbon black (black), etc. You can use. .

[0019]

[Practical Examples] The examples will be described in detail below.

Actual rotation example 1 Alumina 40-45%, silica 50-60%, others 1.5-2. A composition of 5% was foamed to produce a compression strength of 700 kgf / cm ² , a bulk specific gravity of 0.3 to 0.5 g / cm ³ , a melting point of 1600 ° C., and a thermal conductivity of 0.1 (kcal / mhr r ° C.). Al ₂ O ₃ —SiO ₂ — was added to 100 parts by weight of ceramic fine hollow particles composed of completely hollow particles whose distributions were adjusted to fine 12 to 75 μm 6%, medium 75 to 150 μm 59%, and coarse 150 to 350 μm 35%. _{Na 2 O-CaO- B 2 O} 3, mixed ball clay and wollastonite equal amounts, less fine powder and the ceramic composition 100 parts by weight of 44 .mu.m, 50 parts by weight of water, and other additives 1. 5 parts by weight were added and the mixture was kneaded and stirred for 25 minutes in a tumbling mill, and the ceramic composition was coated on the surface of the ceramic fine hollow particles to an average thickness of 2 μm to prepare lightweight ceramic particles coated with a ceramic composition.

Example 2 To 100 parts by weight of the same ceramic fine hollow particles as used in Example 1, 130 parts by weight of aluminum (Al ₂ O ₃ ), 65 parts by weight of water and 1.8 parts by weight of other additives were added. The mixture was kneaded and stirred for 30 minutes in a dynamic mill, and alumina was coated on the surface of the ceramic fine hollow particles to an average thickness of 2.5 μm to prepare alumina-coated lightweight ceramic particles.

Example 3 100 parts by weight of the same ceramic fine hollow particles as used in Example 1, 100 parts by weight of 15 parts by weight of chromium oxide to 100 parts by weight of the ceramic composition used in Example 1, 100 parts by weight of water 1 part by weight and 1.5 parts by weight of other additives are added, and the mixture is kneaded and stirred in a rolling mill for 25 minutes to coat the surface of the ceramic fine hollow particles with the green ceramics composition to an average thickness of 2 μm. Coated lightweight ceramic particles were prepared.

[0023]

[Effect of device]

 As described above, the lightweight ceramic particles according to the present invention use lightweight and tough ceramic fine hollow particles as the base material, and by coating the surface of the ceramic composition with a micron thickness, various types of lightweight bulk specific gravity can be obtained. The particles of the ceramic composition could be produced.

The wall thickness of the ceramic composition coated on the surface of the ceramic fine hollow particles can be arbitrarily adjusted by the amount of the ceramic composition, the amount of water, and the kneading stirring time by the rolling mill.

The lightweight ceramic particles can be used not only as a material for a foam ceramic plate for building materials, but also by themselves can exhibit an effect fused to various catalysts, adsorbents and the like.

[Brief description of drawings]

1 is a cross-sectional view of the lightweight ceramic particles of Example 1.

[Explanation of symbols]

 1. Ceramic fine hollow particles 2. Ceramics composition

Claims (2)

[Scope of utility model registration request] 1. The surface of ceramic fine hollow particles having a compressive strength of 600 kgf / cm ² or more, a bulk specific gravity of 0.3 to 0.5 g / cm ³ , and a melting point of 1500 ° C. or more is coated with a fine powdery ceramic composition of 44 μm or less. Lightweight ceramic particles characterized in that 2. The lightweight ceramic particles according to claim 1, wherein the surface of the ceramic fine hollow particles according to claim 1 is coated with a colored ceramic composition in which an inorganic pigment of 44 μm or less is mixed.