JPS61209971A - Manufacture of inorganic layer porous body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an inorganic layered porous material with excellent heat insulation properties and a method for producing the same.

[Background technology]

As a layered porous body having voids, there is an intercalation material in which a different substance such as a hydroxide is intercalated between layers of a swellable layered compound. This is because the interlayer distance is small, about 4 to 10 people, so it is easily affected by adsorbed water on the surface of the layer, and the proportion of solid parts is larger than the voids, so it is not considered to be very good in terms of insulation. I can't say that. Therefore, a layered porous body with excellent heat insulation properties is desired.

[Purpose of the invention]

In view of the current situation, the present invention provides a method for producing an inorganic layered porous body having relatively large voids between layers and having excellent heat insulation effects.

[Disclosure of the invention]

In order to achieve the above object, the inventors swelled a swellable inorganic layered compound and inserted and fixed the inorganic compound between the layers to obtain a layered porous body with an interlayer distance of 20 to 600 people. This dramatically increased the insulation properties. However, the following problems were found. That is, since the ends of the layered compound are generally positively charged and the layer surfaces are negatively charged, they attract each other to form a house of cards, making it difficult to separate them. In addition, among the inorganic compounds inserted between the layers, those that are negatively charged attract the edges and repel the layer surfaces, making it difficult to insert between the layers, which limits the improvement of insulation properties. there were. Therefore, we conducted repeated studies to obtain a layered porous material with even higher heat insulation effects, and completed this invention.

That is, in order to obtain an inorganic layered porous material in which the layer spacing is maintained by inserting an inorganic compound between the layers, the present invention swells the swellable layered compound, inserts the inorganic compound between the layers, and then dries it. Abstract: A method for producing an inorganic layered porous material, which is characterized in that an anionic surfactant is added to the treatment system at an appropriate time from the swelling to the insertion. shall be. The present invention will be explained in detail below based on the drawings showing one embodiment.

As shown in FIG. 1, which schematically shows the structure, the inorganic layered porous material A obtained by the method for producing an inorganic layered porous material of the present invention has an inorganic compound 2 inserted between the layers 1.1 of the inorganic layered compound. Fixed. Therefore, the layer spacing 3 is maintained at 20 to 600 people. Examples of inorganic layered compounds include Na-montmorillonite and 3-octahedral synthetic smectite, but are not limited to these as long as they are swelling layered compounds. For example, Ca-montmorillonite, which is a hardly swelling layered compound, It may be something like acid clay. When a poorly swellable layered compound such as Ca-montmorillonite or acid clay is used as the main material, it is difficult to swell unless strong shearing force is applied, so it is necessary to knead it during swelling. As the inorganic compound, SiO2, A1203, Fe203, etc. are used alone or in combination. These are inserted between the layers singly or in a stack of 20~
The number will be kept at 600. The shape and particle size of these particles are not particularly limited as long as the spacing between the inserted layers can be maintained at the above-mentioned spacing, but ultrafine colloid particles that are insoluble in water are preferred.

Next, the manufacturing method of the inorganic layered porous material of the present invention will be explained in detail based on drawings showing the process.The material such as the swellable clay mineral is a collection of the swellable layered compound A, as shown in FIG. made of. This compound A, which is the main material,
is mixed with a solvent such as water (kneaded if necessary), and the solvent 4 is impregnated between the layers 1 and 1 to cause swelling, as shown in FIG. To this swollen inorganic layered compound A2, an aqueous solution of an inorganic compound to become a pillar, an anionic surfactant, and optionally additives such as salts containing ions having exchangeability with ions between one layer of water-soluble polymer. is added and sufficiently kneaded to obtain a colloidal solution of an inorganic layered compound (intercalation material) A, in which the inorganic compound 2 is inserted as a pillar between layers 1 and 1, as shown in FIG. The anionic surfactant plays the role of softening the positive charges at the ends of the layered compound and aiding the insertion of the inorganic compound.

Other additives may also be added to further facilitate insertion. Examples of the anionic surfactant include Lavelin FM (naphthalene sulfonic acid soda formalin condensate manufactured by Daiichi Kogyo Seiyaku ■), Teleflow E (Chillnight side type), and the like. Examples of water-soluble polymers include polyvinyl alcohol, polyethylene oxide, polyethylene glycol, sodium polyacrylate, and carboxymethyl cellulose. Examples of salts containing ions that have exchangeability with interlayer ions include Ca''
, AI'''''l B a '', M g 2+, H,
.

Examples include salts such as Se", NHa", Sr", Ce"°, and Cs". These salts are added singly or as a mixture as additives. In Fig. 4, 4 is a solvent, and 5 is an anionic surfactant. Hail. Note that swelling, insertion of inorganic compounds, and addition of additives such as anionic surfactants may be performed simultaneously.Kneading is usually performed using a mechanical method such as a universal mixer, but Any method may be used as long as it can be kneaded.As shown in Figure 6, a colloidal solution of inorganic layered compound A into which an inorganic compound has been inserted is spread into a plate shape with a spatula and oriented to form a multilayer. , and then dried. When the moisture that has entered between the layers is removed by drying, each layer closes with the pillars inserted, so the pillars are fixed between the layers. With this, the plate-shaped inorganic layered porous material A ( It is possible to obtain a molded body (including foil-like and film-like single layer). If this is fired, the surface between the layers will be modified and some fusion will occur between the pillar and the layer, and the pillar will be more firmly interlayered between the layers. It is fixed and has better moisture resistance.

Further, the colloidal solution is dried to obtain a powder of the inorganic layered porous material A as shown in FIG. This powder may be compressed into a desired shape and then fired. According to the former method, it is possible to obtain a product with excellent heat insulation properties in the direction perpendicular to the surface (direction of arrow B in Figure 1), and according to the latter method, it is possible to obtain molded products of various shapes. be.

Examples will be described below.

(Example 1) Powdered Na-montmorillonite as the main material, a swellable layered compound, is swollen with water. Colloidal silica as a pillar dispersion (average particle size 130, 20wt)
% aqueous solution) and Chillflow E (manufactured by Chilnight) as an anionic surfactant were added and kneaded to obtain a colloidal solution of an inorganic layered porous material. This was stretched and oriented into a plate shape (layered shape) with a spatula, air-dried for half a day, and then hot-air dried at 70°C. Thereafter, it was fired at 450° C. for 2 hours to obtain a plate-shaped molded product sample having a thickness of about 1 mm and made of an inorganic layered porous material.

(Example 2) A molded body was produced in the same manner as in Example 1, except that 0.05 of polyethylene oxide (molecular weight 1.5 million to 2 million) was added as an additive at a weight ratio of 0.05 to the main material during kneading in Example 1. A sample was obtained.

(Example 3) A molded body sample was prepared in the same manner as in Example 1, except that the surfactant was changed from Chillflow E to Lavelin FM (manufactured by Daiichi Pharmaceutical ■) and the addition ratio was 0602 to the main material. I got it.

(Comparative Example 1) A molded body sample was obtained in the same manner as in Example 1 without adding additives such as anionic surfactants.

The thermal conductivity and density of the molded body samples obtained in these Examples were measured, and the results are shown in Table 1 together with those of three comparative examples of Comparative Example 1) Gypsum board and sand molded bodies.

The thermal conductivity was measured using a thermal conductivity measuring device using a xenon flash method. As shown in Table 1, all of the Examples have sufficiently superior properties in terms of thermal conductivity compared to the Comparative Examples. It can be said that adding additives is particularly good, and if there is no cost problem, it is more preferable to add additives.

The layer spacing varies somewhat depending on the type and particle size of the inorganic compound forming the pillars, but it was determined by the known CI method that it was in the range of 20 to 600 people in all Examples.

(Margins below) Table 1 [Effects of the Invention] Since the method for producing an inorganic layered porous material of the present invention has the above-mentioned structure, the inorganic layered porous material obtained in this way has a pillar structure. Depending on the inorganic compound, the layer spacing is 20~
600 people, it has very good insulation properties and does not deteriorate much over time, making it useful as a heat insulating material.

[Brief explanation of drawings]

Fig. 1 is a schematic side view of an inorganic layered porous material, Fig. 2 is a schematic side view of a swellable layered compound, Fig. 3 is an explanatory diagram explaining the state leading to swelling, and Fig. 4 is a schematic side view of an inorganic layered porous material. An explanatory diagram illustrating the state during insertion of the inorganic compound, FIG. 5 an explanatory diagram illustrating the state at the end of insertion and drying, and FIG. 6 an explanatory diagram illustrating the state in which the inorganic layered porous material is oriented into a plate shape. It is. A... Inorganic layered porous material A1... Swellable inorganic layered compound 1... Layer 2... Inorganic compound 4... Solvent 5... Anionic surfactant agent Patent attorney Takehiko Matsumoto Figure 1 Figure 2 Figure 3 ΔF Figure 4 Figure 5 Procedural amendment (June 13, 1985, Commissioner of the Japan Patent Office, Pa!)
1, 1q of cows 0? JI] 6 0 ri 1 cow￥ffi'fljAO517
56 No. 3, Relationship with the case of the person making the amendment Patent applicant Address 1048 Kadoma, Kadoma City, Osaka Name (583) Representative of Matsushita Electric Works Co., Ltd. ((3% position Sadao Fujii 4, no agent 6, Specification subject to amendment 7, Contents of amendment (1) “Publicly known” and “CI method” in page 9, line 16 of the specification
Insert "in nitrogen adsorption method" between the two.

Claims (2)

[Claims] (1) In order to obtain an inorganic layered porous material in which an inorganic compound is inserted between layers to maintain the interlayer spacing, a swellable layered compound is swollen, an inorganic compound is inserted between the layers, and then drying is performed. A method for producing a layered porous material,
A method for producing an inorganic layered porous material, characterized in that an anionic surfactant is added to the treatment system at an appropriate time from the swelling to the insertion. (2) The method for producing an inorganic layered porous material according to claim 1, wherein the inorganic compound is an ultrafine colloid insoluble in water.