JPS6029663B2 - Inorganic cured composition - Google Patents

Description

[Detailed description of the invention] This invention relates to an inorganic cured composition.

BACKGROUND ART Magnesium carbonate plates and calcium aluminate trisulfate hydrate (hereinafter abbreviated as TSH) plates have been known as inorganic cured compositions used as building materials and the like.

Magnesium carbonate plates are obtained by adding water to neutral magnesium carbonate to form a slurry, shaping this by papermaking, etc., and then curing with moist heat to hydrate the neutral magnesium carbonate and harden it to basic magnesium carbonate. It was getting worse. The magnesium carbonate plate obtained in this manner has the drawbacks of low strength and a large decrease in strength upon absorption of water. The TSH plate is made by mixing Ca0 component raw materials, N203 component raw materials, and CaSO and Bosen raw materials at a molar ratio of 3:1:3, and hydrothermally synthesizing this to produce calcium aluminate monosulfate hydrate (hereinafter abbreviated as MSH). create,
1 to 2.5 moles of gypsum was added to 1 mole of this, and water and, if necessary, a fibrous reinforcing material such as pulp were added and mixed to make a slurry, and this was shaped by paper-making etc. It was obtained by curing and converting MSH into TSH and hardening it. The TSH board thus obtained also had the drawbacks of low strength and a large decrease in strength upon water absorption. Therefore, an object of the present invention is to provide an inorganic cured composition that has high strength and exhibits a 4.0 mm decrease in strength upon water absorption.

A feature of this invention is that an inorganic hardened product containing MSH, TSH, and basic magnesium carbonate as main components is formed by shaping and curing an aqueous slurry containing MSH and TSH generating materials and neutral magnesium carbonate as main components. The reason is that the composition is made up.

That is, by doing this, the generated TSH
Since the microcrystals of MSH and basic magnesium carbonate are intricately and firmly intertwined, the inorganic cured composition has high strength and exhibits little strength loss upon water absorption. In addition, TSH is decomposed by carbon dioxide gas in the air, but M
Since SH does not have such a problem, the inorganic cured composition of the present invention has little strength deterioration over time. Next, this invention will be explained in detail.

In this invention, neutral magnesium carbonate (MgC03) is used as a raw material for the inorganic cured body composition.

Upon hydration, this product produces basic magnesium carbonate (XM
gC03・Mg(OH)2) and hardens.

Such neutral magnesium carbonate is obtained by a conventional method. The MSH and TSH generating material may be any material that ultimately becomes MSH and TSH.

For example, the aforementioned MSH gypsum, MSH production material + gypsum, C3A (length a○/N203) gypsum, C3AH6
(Length a0, AI203, red also ○) Togoku Kou, C4A3S
($a○・3ri203・CaS04) Combinations such as ten-kokukou are listed. In these combinations, by selecting a proportion of gypsum smaller than the amount required for complete TSH conversion, a system containing MSH and TSH can be obtained. In addition to the above raw materials, if necessary, fibrous reinforcing materials (pulp, wood flour, hemp, synthetic fibers, glass fibers, rock wool, asbestos, etc.), fillers (IJ flour, talcum powder, etc.), , clay, diatomite, alumina powder, etc.) Other additives such as template agents and pigments may also be added.

The mixing ratio of the above raw materials is as follows.

That is, neutral magnesium carbonate and MSH and TSH
The product material is preferably blended so that the weight ratio of (basic magnesium carbonate)/(MSH+TSH) in the cured body composition is from 9/1 to 1/9. When using fibrous reinforcing material, 0.5 to 3.5% by weight based on the total solid content
(hereinafter abbreviated as %) is preferable. To explain in more detail the blending ratio of the reinforcing material, when using glass fiber, it is 0.5 to 5%, and asbestos is 1%.
~35%, 1 to 10 when using organic fibers such as pulp
It is more preferable to select %. When producing an inorganic cured body composition using the above raw materials, it is carried out as follows.

That is, neutral magnesium carbonate and MSH and TSH
An aqueous slurry is created by mixing the product materials, adding fibrous reinforcement if necessary, and adding and mixing water. Next, shape this. The shaping method may be paper-making method, Western-style method, or
Appropriately selected from direct pressure press method, roll press method, etc. In this case, the direct press method is used when the water content of the aqueous slurry is very low, and the sand press method is used when the water content is very high. Next, the excipient is cured. During this curing, hydration progresses, and neutral magnesium carbonate becomes basic magnesium carbonate, and the production of MSH and TSH progresses, resulting in hardening. In this case, there is no problem even if the reaction is not completed and some neutral magnesium carbonate remains. In that case, treat neutral magnesium carbonate as basic magnesium carbonate. Next, the cured product is dried (including natural drying) to obtain an inorganic cured composition. The inorganic cured product obtained in this way has a complex and strong intertwining of microcrystals of TSH and MSH produced and basic magnesium carbonate, so the inorganic hardened product has low strength, strength loss upon water absorption, and impact resistance. The performance is much better than that expected when the performances of TSH, MSH and basic magnesium carbonate are combined.

Moreover, over time, TSH partially decomposes under the action of carbon dioxide gas in the air, producing lime, gypsum, and aluminum hydroxide, resulting in a decrease in bulk specific gravity and strength. However, this is not the case with MSH. Therefore, an inorganic cured composition containing a TSH component and an MSH component has less strength deterioration over time than one containing only a TSH component. Next, examples will be described.

Example: An aqueous slurry is prepared by blending neutral magnesium carbonate, MSH, gypsum, asbestos, water, and pulp in a predetermined ratio, and this is shaped in a conventional manner and then cured and dried to form basic magnesium carbonate 4. An inorganic cured body composition consisting of parts by weight (hereinafter abbreviated as parts), 60 parts of MSH+TSH, 5 parts of asbestos, and 5 parts of pulp was obtained.

Claims (1)

[Scope of Claims] 1. Constructed by shaping and curing an aqueous slurry whose main components are materials for producing calcium aluminate monosulfate hydrate and calcium aluminate trisulfate hydrate and neutral magnesium carbonate. An inorganic hardened composition containing calcium aluminate monosulfate hydrate, calcium aluminate trisulfate hydrate, and basic magnesium carbonate as main components. 2. The composition ratio of the basic magnesium carbonate and the total amount of the calcium aluminate monosulfate hydrate (MSH) and calcium aluminate trisulfate hydrate (TSH) is (basic magnesium carbonate)/(MSH+TSH). ) weight ratio of 9/1
The inorganic cured composition according to claim 1, which is selected to be 1/9 to 1/9. 3. The inorganic cured composition according to claim 1, further comprising a fibrous reinforcing material.