JPS5842151B2 - hardened body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cured body of Ceracola, and more specifically, a cured body having a diameter of 0.01
The present invention relates to a cured body of Ceracola obtained by impregnating and curing a molded body obtained from a raw material mainly composed of lightweight spherical Ceracola having a bulk density of 0.02 to 0.811/- with an impregnating substance.

Conventionally, lightweight cured Ceracola materials include those mixed with lightweight aggregate, those with air bubbles mixed into the cured material using a foaming agent, and those made with needle-shaped Ceracola mixed with a large amount of water. ing.

However, these cured Ceracola products have drawbacks such as insufficient strength and poor economic efficiency.

In order to improve this drawback, the present inventors have developed a Ceracola molded article using a new lightweight spherical Ceracola as a raw material.

However, this cured product of Ceracola is not necessarily sufficient in terms of water resistance, surface properties, etc.

The object of the present invention is to eliminate such drawbacks and provide a cured Ceracola product with improved strength.

One example of the method for manufacturing the lightweight spherical Ceracola used in the present invention is to heat and stir in an acidic solvent at a temperature of 100 to 180°G to cause a hydrothermal reaction using semihydrous Ceracola, dihydrate gypsum, etc. as raw materials. obtained by.

The spherical ceracola thus obtained is substantially formed by the intertwining of fibrous α-type hemihydrate snails, and microscopically shows a burr-like or marimo-like shape.

In the present invention, the spherical α-type hemihydrate slurry after the completion of the hydrothermal reaction may be used as the S material, or the wet spherical α-type hemihydrate slurry after solid-liquid separation may be used as the S material. It is also possible to use spherical α-type hemihydrous ceracolla obtained by further drying or spherical soluble or insoluble anhydrous ceracola obtained by firing this.

For example, the drying process is performed at a temperature of 50 to 80°C for 1 to 8 hours.
All you need to do is to do it for a certain amount of time.
What is necessary is just to carry out at 00 degreeC for 1 to 3 hours.

Spherical Ceracola usually has a diameter of 0.01 to 10 mm and a bulk density of 0.05 mm, although it varies depending on the manufacturing conditions.
02~o, s g/c111.

When making a molded object from the above-mentioned lightweight spherical Ceracola, the lightweight spherical Ceracola may be used alone, or a reinforcing agent such as fibrous slag, asbestos, or a filler such as pearlite or shirasu balloon may be appropriately blended.

In addition, during molding, water is added to the raw material Ceracola in an amount greater than the theoretical hydration amount required to convert it to trihydric Ceracola, resulting in hydration and curing.

Any method can be used, such as adding a curing accelerator and/or binder during hydration curing, or adding only a binder and curing, followed by compression, extrusion,
A lightweight Ceracola molded body is obtained by molding by a molding method such as pouring, paper forming, or spraying.

Both aqueous and anhydrous binders can be used as binders; examples of binders include polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, polyacrylamide, polyacrylic acid, polyethylene oxide, etc. water-soluble organic polymer,
Water-dispersible organic polymers such as vinyl acetate emulsions and acrylic resin emulsions, water-soluble inorganic compounds such as water glass and sodium silicate, water-dispersible colloid-forming inorganic compounds such as alumina sol and silica sol, and hydraulic properties such as cement and gypsum. These include compounds and mixtures thereof.

These binders range from 0.01 to 0.01 based on the weight of the spherical Ceracola.
It may be added in a range of 100 times.

Further, as a hardening accelerator, magnesium sulfate, calcium chloride, potassium sulfate, potassium nitrate, steel sulfate, etc. can be used as appropriate.

After drying the molded body to remove free water, it is impregnated with an impregnating substance.

Examples of impregnating substances include methyl methacrylate, polymerizable monomers such as styrene, liquid rubber, polymerizable prepolymers such as polyurethane, thermosetting resins, thermoplastic resins, wax, asphalt, sulfur, and metals. etc., and may be appropriately selected in consideration of the purpose of use of the cured Ceracola product as the final product.

Furthermore, depending on the type of impregnating substance, it may be necessary to perform a treatment such as dissolving it in a solvent or heating it to melt it before use.

The impregnation treatment can be carried out by any method, such as immersing the molded body in the impregnating substance or partially (superficially) impregnating it by spraying or brushing. It may be determined in consideration of properties such as viscosity and purpose of use.

Further, when performing the impregnation treatment, it may be carried out under reduced pressure, normal pressure, or increased pressure.

Since the lightweight Ceracola molded article used in the present invention has a large number of pores and a high porosity, it is possible to impregnate it with the impregnating substance to a desired degree by selecting an appropriate means.

Incidentally, in the impregnation treatment, it goes without saying that auxiliary components such as a curing agent may be added as necessary.

After the impregnation treatment, the cured Ceracola product obtained by curing is lightweight and has high strength, as well as improved water resistance and surface hardness.

Furthermore, secondary processability such as adhesion has also been improved. Therefore, the cured product of Ceracola of the present invention can be used advantageously as a construction material for houses, warehouses, etc., and also as a general industrial material.

Next, the present invention will be explained by examples.

Production example: Production of lightweight spherical Ceracola 12 kg of 2-water solution in 0.5% by volume acetic acid aqueous solution 601
and β-type hemihydrate 600.9 were added and mixed to prepare a slurry.

A hydrothermal reaction was carried out for about 30 minutes while stirring this slurry using a propeller-type stirring blade under saturated steam pressure at 120°C.

After the completion of the hydrothermal reaction, the solid material obtained by separating solid and liquid with a centrifuge during heating is dried at 60°C for about 8 hours using a hot air dryer to obtain a lightweight spherical α-type semi-hydrated slag. Obtained.

In addition, a part of this α-type semi-water slag was produced using an electric furnace.
After firing at 00°C for 3 hours, lightweight spherical anhydrous Ceracola was obtained.

The obtained lightweight spherical ceracola each had an average diameter of 250 μm.
, and the bulk density was 0.10 g/Cr1t.

Example 1 1,800 ml of water was added to 460 g of a lightweight spherical α-type hand wash to make a slurry, and this slurry was applied to a papermaking surface of 30 cI.
It was poured into a papermaking mold having a wire mesh of 40 meshes with rL x 30crIL, and then subjected to papermaking compression molding. After hydration and hardening, the mold was removed.
It was dried in a hot air dryer at 0°C to obtain a plate-shaped lightweight Ceracola molded body.

The specific gravity 2 bending strength and water absorption rate of this molded body are shown in Table 1, Scrap 1, as a comparative example.

Next, this molded body was impregnated with varying amounts of methyl methacrylate containing 1% by weight of benzoyl peroxide, and this body was wrapped in aluminum foil and left in a hot air dryer kept at 80°C for 4 hours to polymerize. was made to do so.

The obtained results are shown in Table 1 from 42 to /16.5.

. Impregnation rate - 1 weight of cured body - 1 weight of molded body Molding weight *Water absorption rate Weight increase rate after 24 hour immersion in a 20°C solution Example 2 Moisture-curing polyurethane resin was added to the same molded body as used in Example 1. was impregnated and left to stand for 24 hours to obtain a cured product.

The results are shown in Table 6 of Table 2. Example 3 The same molded body used in Example 1 had a melting point of 63°C.

Wax at 83° C. was heated to 90° C. for impregnation, and then cooled to obtain a cured product.

The results are shown in /I67 and /168 of Table 2.

Claims (1)

[Claims] 1. Diameter 0.01~1011Li, bulk density 0.02~
A cured Ceracola product obtained by impregnating and curing a molded product obtained from a raw material mainly consisting of 0.8 g/- lightweight spherical Ceracola with an impregnating substance. 2. The cured body of Ceracola according to claim 1, wherein the lightweight spherical Ceracola is selected from α-type hemihydrate, soluble anhydrous, and insoluble anhydrous Ceracola. 3 The impregnating substance is a polymerizable monomer dipolymerizable prepolymer,
Thermosetting resins, thermoplastic resins, waxes. The cured body of Ceracola according to claim 1, which is at least one substance selected from the group consisting of asphalt, sulfur, and metal.