JPH0647247B2 - Rice husk solidification method - Google Patents

Description

[Detailed Description of the Invention] [Industrial field] The present invention relates to a method for producing a solidified rice husk, which is used as a core material for building material panels in the construction of low-cost housings in Southeast Asia. is there.

"Conventional technology" Development of low-cost housing is required to improve housing conditions in Southeast Asia. In constructing such a low-cost house, it is necessary to select a building material that is as inexpensive as possible in order to reduce costs first. For this reason, it is considered to use rice husks as a core material of panels used for wall panels and the like. This is because rice husk is an agricultural waste, and it is abundant and cheap to obtain, especially in Southeast Asia.

As a method of manufacturing the core material of the panel from this rice husk,
A possible method is to solidify the rice husks with cement, vinyl acetate resin-based, acrylic resin-based emulsion adhesives, and solidifying agents such as lime and seaweed extract (sodium alginate), and use this rice husk solidified product as the core material of the panel. .

“Problems to be Solved by the Invention” However, the rice husk solidified product used as the core material of the panel as described above has the following problems.

[1] If cement is used as the solidifying agent, the weight of the panel itself becomes large, and a lifting machine or the like must be used when building, which is troublesome and the construction cost of the house rises. There was a problem such as doing.

[2] When an adhesive is used as the solidifying agent, the adhesive is very expensive as compared with the rice husk, so that the production cost of the rice husk solidified product is also high, and there is a problem that does not lead to cost reduction of the panel. It was

[3] In the case where lime and a seaweed extract such as sodium alginate are used as the solidifying agent, the lime and the sodium alginate solidify in a state of containing a large amount of water, and thus the weight of the solidified product is reduced. It is difficult to do so, and the seaweed extract is expensive, and there is a problem that it is not a lightweight and low-priced core material.

"Means for solving the problem" Therefore, the present invention is to add the rice husk of approximately the same volume as the basic solution to the basic solution and boil it to make the basic solution caking property in the rice husk. The components are eluted to form a suspension, and then rice husks are added to the suspension and mixed by stirring to form a rice husk-containing suspension, and the rice husk-containing suspension is formed into a predetermined shape. By molding and solidifying into a solid, a rice husk solidified product which solves the above problems was obtained.

[Working] In the method for producing a solidified rice husk of the present invention, a binding component (for example, alkali cellulose or lignin) in the rice husk is eluted into the basic solution by boiling the rice husk in a basic solution. A suspension is produced. A rice husk-containing suspension is produced by adding rice husks to the suspension, and the rice husk-containing suspension becomes a solidified rice husk by solidifying the caking component.

[Example] Hereinafter, a method for producing the solidified rice husk of the present invention will be described in detail.

This invention is characterized in that the rice husk is heat-treated in a basic solution to elute the caking component in the rice husk into the basic solution, and the rice husk is solidified by the caking component. .

The basic solution described above is selected by dissolving the tissue of rice husk and destroying it to elute the caking component or the like constituting the tissue, and specifically, such as caustic soda and caustic potash. A strongly basic aqueous solution or the like is preferably used. Then, the concentration of the basic solution is appropriately determined according to the type of the basic solution within the range in which the above effects can be obtained. For example, when the basic solution is a caustic soda solution, its concentration is usually in the range of about 10 to 30% by volume. 10% by volume
When the amount is less than the above range, a caking component sufficient to solidify the rice husks is not eluted, so that a problem that a rice husk solidified product is not finally obtained occurs. In addition, if it exceeds 30% by volume,
The effect of eluting the caking component from the rice husks reaches a ceiling, which is uneconomical and causes a great danger because the concentration is too high.

This basic solution is stored in a container capable of heating, stirring and mixing and heated. Liquid temperature of the basic solution at this time, when the rice husk described below is added to this basic solution, the oil content such as lipids on the surface of the rice husk is removed, and a temperature suitable for swelling the rice husk. Preferably from 70 to 10
It is preferably in the range of about 0 ° C. Then, in the thus heated basic solution, approximately the same volume of rice husks as the basic solution is added, and the rice husks are swollen. Here, the above-mentioned rice husk is agricultural waste such as glaze which is produced in the refining process of crushing paddy rice into brown rice. The time required for the above swelling is in the range of about 3 to 60 minutes.

Next, the rice husks in the basic solution are boiled and heat-treated in the basic solution. Here, the time required for this heat treatment is determined by the extent to which the structure of the rice husk is destroyed, and is usually in the range of about 3 to 60 minutes. If it is less than 3 minutes, the heat treatment to the rice husk is too short and the heat treatment to the rice husk is insufficient, and if it exceeds 60 minutes, the structure of the rice husk is almost completely destroyed, and further elution of the caking component cannot be observed. It causes inconvenience such as becoming economical. Then, in the heated basic solution, caking components such as alkali cellulose and lignin are eluted from the chaff. This caking component is a substance that constitutes the structure of rice husks, and it has the property of easily solidifying at low temperatures, although it has fluidity at high temperatures.

Next, in such a basic solution in which such a caking component is dissolved and undissolved rice husk is suspended, approximately 10 times the amount of rice husk of the basic solution is newly added to form a basic solution. The rice husk is stirred and mixed for a predetermined time until the rice husk is sufficiently mixed with the sexual solution. This suspension is poured into a mold having a predetermined shape and pressure-molded to obtain the target rice husk solidified product.

The solidified rice husk solid thus obtained is solidified at a low cost because the rice husk itself is solidified by the caking component of the rice husk, and can be suitably used as a core material of a panel, for example.

Hereinafter, the effects of the present invention will be clarified by showing experimental examples.

(Experimental Example) 10 liters of a 30% by volume caustic soda solution was prepared and
It was heated to about 100 ° C. The same volume of rice husks was added to this caustic soda solution and mixed by stirring to swell the rice husks. Next, the caustic soda solution was heated, and the rice husks were heat-treated for about 60 minutes. Then add about 0.2 to the caustic soda suspension.
A new rice husk of m ³ was added and mixed by stirring to obtain a rice husk-containing suspension. And a panel was manufactured using this suspension as a core material.

It was found that this panel has excellent strength as a building material and is excellent in erection workability because it is lightweight.

Moreover, the trial production cost of the solidified rice husks used for the core material of this panel was calculated, and the results shown in Table 1 were obtained. Table 1 also shows the production cost of the solidified rice husk used in the core material of the conventional panel. The production cost is shown as the cost per unit area when the above-mentioned rice husk solidified product was applied to a plate having a thickness of about 50 mm.

As is clear from Table 1, the one using the caking component in the rice husk to solidify the rice husk is significantly cheaper than the conventional one.

[Effects of the Invention] As described above, according to the method for producing a solidified rice husk of the present invention, the rice husk can be easily solidified by the caking component contained in the rice husk.

In addition, since the rice husk solidified product obtained by this production method uses rice husk of agricultural waste as a main raw material, it can be produced at low cost and its application is wide.

Claims (1)

[Claims] 1. A rice husk having substantially the same volume as that of the basic solution is added to the basic solution and subjected to a boiling treatment to elute the caking component in the rice husk into the basic solution to form a suspension. Next, rice husks are added to this suspension and mixed by stirring to produce a rice husk-containing suspension, and the rice husk-containing suspension is molded into a predetermined shape and solidified. Manufacturing method of solidified rice husk.