JP4585605B1 - Rice husk building material and its manufacturing method - Google Patents

Abstract

The present invention provides a rice husk building material that is not crushed during the stirring and mixing of rice husk and adhesive, and that the entire rice husk is coated with an adhesive, thereby providing a strong, highly heat-insulating and sound-insulating material.
SOLUTION: 100% by weight of rice husk is coated with 10 to 15% by weight of a water-repellent resin adhesive in a state of being impregnated with 5% by weight of water, and dewatering treatment is performed at 140 ° C. for 5 to 7 minutes under a heating load. And 67% capacity reduction processing by the required pressure.
[Selection] Figure 1

Description

  The present invention relates to a building material whose main raw material is rice husk.

Building materials mainly composed of rice husks are disclosed in JP 2002-3263 (Patent Document 1), JP 2002-3279 (Patent Document 2), JP 2008-291235 (Patent Document 3), This is proposed in Japanese Laid-Open Patent Application No. 06-8968 (Patent Document 4). The present applicant also holds rice husk-free pollution heat insulating material as Patent No. 3716371 (Patent Document 5).
In Patent Documents 1 and 2, in order to impart flame retardancy to rice husk, the rice husk is crushed to mix or stir the water-soluble inorganic compound having adhesiveness or the water-soluble inorganic compound having coating property or film-forming property and rice husk. Therefore, the air gap is reduced and the sound absorption characteristics are inferior.
Patent Document 3 increases the compressive strength by adding a PVA (polyvinyl alcohol) resin having a specific specification to rice husks.
In Patent Document 4, water is sprayed on the rice husk to wet the surface, and then the vegetable adhesive powder is sprayed, water is further sprayed to liquefy the vegetable adhesive powder, and the rice husk is stirred and mixed with a stirrer. It is time-consuming for the adhesion process.
Patent Document 5 is an invention pursuing heat insulation, which is the basis for the development of building materials having sound insulation.

JP 2002-3263 A Japanese Patent Laid-Open No. 2002-3279 JP 2008-291235 A Japanese Patent Laid-Open No. 06-8968 Japanese Patent No. 3716371

  In the present invention, the rice husk is not crushed at the time of stirring and mixing the rice husk and the adhesive, and the entire rice husk is coated with the adhesive in a moisture-removed state, thereby providing a strong, heat-insulating and sound-insulating husk building material. The purpose is to provide.

The rice husk building material according to claim 1 of the present invention is coated with 10 to 15% by weight of a cross-linking agent for wood adhesive in a wet state in which 5% by weight of water is impregnated with 100% by weight of rice husk, and 140 ° C. in the dehydration treatment by heating load of 5 minutes to 7 minutes, chaff by the 60% to 70% volume reduction treatment with a pressure of 0.9 kg / cm ^2, which are treated under conditions which will not be crushed.
The method for producing rice husk building material according to claim 2 includes a moisture wetting step in which 5 wt.% Of water is sprayed on 100 wt.% Of rice husk and uniformly dispersed and stirred, followed by the cross-linking agent 10 to 10 for wood adhesive. Adhesive coating process that adds 15% by weight and stirs well, dehydration process by heating load at 140 ° C for 5 to 7 minutes, and 60-70% capacity reduction by 0.9 kg / cm ² pressure chaff by a process consisting of process conditions that are not crushed.

  In the present invention, since the rice husk can be coated on the entire rice husk in a wet state, there is no crushing due to the rigidity of each rice husk, and sufficient space is secured in each rice husk after the adhesive is solidified, which is used as a building material. Sometimes exhibits excellent heat insulation and sound insulation.

The partial perspective view of the chaff construction material A of this invention.

The cross-linking agent for wood adhesive used in the present invention has water repellency, and if the cross-linking agent is added to the wet rice husk containing moisture and stirred sufficiently, the entire rice husk is not mixed with water. The cross-linking agent is coated on the surface, and is firmly molded by evaporation of moisture by dehydration and 60-70% capacity reduction treatment in each mold.

The rice husk building material A manufactured by the method for manufacturing rice husk building material according to the present invention will be described by way of an example. Spraying and stirring uniformly 5% by weight of water with respect to 100% by weight of rice husk, After moistening and softening, add 10 to 15% by weight of a cross-linking agent 2 for wood adhesive as a water-repellent resin adhesive and stir well to coat the entire rice husk 1 with the cross-linking agent 2 Then, with a mold not shown in the figure for pressurization (various shapes are selected), a heating load of 140 ° C. is applied for 5 to 7 minutes, dehydration treatment is performed to evaporate moisture, Furthermore, 67% capacity reduction processing is performed at a required pressure of 0.9 kg / cm ² to form rice husk building material A having a plane size of 1000 × 2000 mm shown in FIG. Note that the rice husk 1 shown in FIG. 1 is sparse but simply expressed, and is actually a dense state compressed to a capacity of 67%.

Since the rice husk building material A molded in this manner is one in which each rice husk 1 is wet and coated with the crosslinking agent 2 and dehydrated without being crushed, Many voids 3 are secured, and it has strong, high heat insulating and sound insulating properties.
Therefore, this rice husk building material A is a core material of a wooden fitting that is expected to have a heat insulation and sound insulation effect, a flat panel material as an interior decoration material for indoor use, and a concave portion 4 and a convex portion 5 as shown in FIG. It is used for the panel material which has.

  The present invention is an environmentally friendly and non-polluting product because the adhesive coated on rice husks is a self-regulated product that is compatible with indoor air pollution countermeasures. It also contributes to the revitalization of the agricultural rice industry in terms of efficiency.

1: Rice hulls 2: Cross-linking agent for wood adhesives 3: Gaps 4: Recesses 5: Protrusions A: Rice hull building materials

Claims (2)

10% to 15% by weight of a cross-linking agent for wood adhesive is coated in a wet state impregnated with 5% by weight of moisture with respect to 100% by weight of rice husk, and dehydration by heating load at 140 ° C. for 5 minutes to 7 minutes , A rice husk building material that is processed under the condition that the rice husk is not crushed by a 60-70% capacity reduction treatment with a pressure of 0.9 kg / cm ² . Moisture wetting process in which 5% by weight of water is sprayed on 100% by weight of rice husk and uniformly dispersed and stirred, followed by addition of 10 to 15% by weight of a cross-linking agent for wood adhesive followed by sufficient stirring and agent coating step, comprising a dehydration step by heat load of 5 minutes to 7 minutes at 140 ° C., from process conditions chaff by the 60% to 70% volume reduction process by the pressure of 0.9 kg / cm ² is not crushed A method for manufacturing rice husk building materials.

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