JPS63118203A - Manufacture of rice hull board - Google Patents

Abstract

PURPOSE:To contrive to apply a board to the base material for a floor by improving its sound-insulation, cushion-property, durability for load change, while attaining a practical use of unutilized natural resources by a method in which the board raw material having rice hull as a main composition is coated with an adhesive and then it is pressed after forming. CONSTITUTION:The rice hull as it is, or leaflike or rodlike member which is made by pulverizing rice hull may be used as rice hull-raw material. An adhesive is preferably such that is prepared by a method wherein one kind or more synthetic rubber latix obtained by copolymerization or single polymerization by means by emulsion polymerization method is mixed with the monomer having conjugated double bonds as a main composition. The rice hull-raw material coated with this adhesive is accumulated and formed into a desired thickness on a flat plate, e.g. metal plate, whereby a mat shape is made A pressing process is preferably achieved by hat pressing by using a hot press. Consequently, while practically using the proper characteristics of rice hull, the board of porous structure with rubber elasticity may be made, and further it is used for floor material excellent in sound insulation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing rice husk board, and in particular, it can be used as a second-story flooring material for a house or a flooring material for a high-rise apartment complex, as it has cushioning properties and is resistant to deformation under load. This invention relates to a method for manufacturing rice husk board, a building material for floors, which is durable and has excellent sound insulation effects, and which utilizes waste materials from food production.

[Conventional technology 1] Conventional wooden floor building materials lack cushioning and sound insulation properties, and in order to improve the environment in Western-style rooms and hallway floors on the second floor and above, wooden floors, carpets, or plastic floors have been used. However, there have been various problems such as damage caused by pests such as house mites and dents and deformation of the remains of heavy furniture.Recently, a switch has been made to decorative plywood flooring, but due to poor sound insulation. Due to many complaints, those skilled in the art have attempted to individually use multi-layered flooring materials combining ordinary particle board, insulation board, plywood, plastic foam, etc., but the technology has not yet found a fully satisfactory flooring material. The current situation is that it has not been established.

Furthermore, looking at the degree of utilization of the rice husks used as the raw material for the board in the present invention, some of them are used as cushioning materials for fruits such as apples and pears, and for steel manufacturing, but the majority of them are The current situation is that because rice husks are difficult to rot, a huge amount of rice husks are not used as fertilizer and are incinerated, turning into futile smoke and ash.

[Problem to be Solved by the Invention 1] The present invention aims to utilize unused resources, and at the same time provides a board that is particularly useful as a floor base material and has excellent sound insulation properties, cushioning properties, durability against load deformation, and especially sound insulation properties. The purpose is to provide

The above and other objects and novel features of the present invention include:
It will become clear from the description in this specification.

[Means for Solving the Problems 1 and Effect 1] The present invention provides adhesives to rice husks, crushed rice husks, or board raw materials containing the rice husks as a main component (these are collectively referred to as rice husk raw materials). The present invention relates to a method for producing a rice husk board, which comprises applying the adhesive, and then pressing the rice husk raw material coated with the adhesive after homing.

In one preferred embodiment of the present invention, a rubber latex to which a vulcanizing agent or the like is added is used as the adhesive, which exhibits rubber elasticity after solidification.

The structure and operation of the present invention will be sequentially explained below.

[Rice husk raw material] If we look at the properties of rice husk individually, it is light, strong, and has excellent elasticity, and its shape is concave, spindle-shaped and boat-shaped, and it is resistant to rot. . When making a board using this rice husk, more voids are formed inside the board than the shape of the rice husk itself, resulting in a porous structure.
It exhibits an extremely effective sound absorbing effect, and due to the interaction between the elasticity of the rice husk itself and the rubber elasticity of the above adhesive, good elasticity is obtained, and due to the interaction between the shape and properties, excellent It can be used as a sound insulation material.

Rice husks can be obtained when ``husking'' grain grains.

For example, rice or wheat paddy is processed into grains using a hulling machine. ! 2
It is preferable to use dried rice husks obtained in the process of separating fa from the rice husks, whose moisture content is 11 to 1
Preferably it is 3%.

Rice husks are generally easy to collect.

In the present invention, the rice husk raw material may not be the rice husk as it is, but may be crushed into flakes or rods, for example.

In addition, in the present invention, the physical properties and strength are modified, and while these rice husks are used as the main raw material for reinforcement, a part of them is replaced with cuttings of stems or leaves of plants of the family Chrysanthemum family, wood chips, or wood flour. It's okay.

An example of the cut material is straw cut into 1 to 2 cm pieces.

Wood chips and wood powder are obtained by cutting and crushing wood. The amount of these board raw materials used is 0 to 4 per rice husk.
It is 0% by weight.

As the raw material for the board, crushed peanut pods, rubber, plastic, or foams thereof may be used, and the amount used is 0 to 40% of the amount of rice husks.
Weight%.

[Adhesive 1] The adhesive (layer) having rubber elasticity increases the sound insulation effect of the board.

A preferred example of the adhesive is a mixture of one or more synthetic rubber latexes obtained by copolymerization or homopolymerization by emulsion polymerization, the main composition of which is a monomer having a conjugated double bond.

In order to achieve the desired purpose of the present invention, such as imparting rubber elasticity, the composition of the upper layer is preferably 70% or more.

Examples of the synthetic rubber latex include synthetic rubber latexes such as butadiene, isoprene, chloroprene, styrene butadiene rubber, and nitrile rubber.

A mixed latex in which a part of the synthetic rubber latex is replaced with natural rubber latex may also be used.

It is preferable to use these synthetic rubber latexes or mixed latexes as a main material, and to add additives to the main material, which improve adhesive strength, water resistance, durability against deformation under load, etc. through vulcanization and crosslinking effects.

Examples of such additives include vulcanizing agents, vulcanization aids, and vulcanization accelerators useful for vulcanizing the rubber components in these latexes, and examples of vulcanizing agents include sulfur powder. Further, examples of the vulcanization aid (which may also serve as a vulcanizing agent in some cases) include zinc white. Furthermore, as examples of the vulcanization accelerator, thiazole-based commercial products represented by the product symbol MZ, and dithiocarbamate-based commercial products represented by the product symbols EZ and PX can be used.

Additives exemplified by one or more of incyanate, sensitizing hydrogen, glyoxal, methylolmelamine, and resorcinol/formaldehyde initial condensate improve the water resistance strength of the port and improve the adhesive strength due to their crosslinking action. It is preferable to add it because it can enhance the

The amount of the additive (crosslinking agent) added is preferably 2 to 10% by weight based on the latex.

Further, by adding iron oxide powder, the sound insulation effect can be improved, which is preferable.

Examples of iron oxide powder include Fe3O4 or FeLO,
alone or a mixture thereof, with a specific gravity of 5.0 or more,
200 Powders that pass 90% or more through a mesh sieve are mentioned.

Furthermore, it is also preferable to add a fungicide, an insect repellent, a flame retardant, an anti-aging agent, a filler, etc.

The amount of the adhesive applied to the rice husk raw material is 10% of the rice husk raw material.
Based on the rubber component in the adhesive for 0 parts by weight,
The amount is preferably 30 parts by weight or more, preferably 30 to 80 parts by weight.

The adhesive is applied uniformly to the rice husk raw material.

[Homing 1 [Pressing 1] The rice husk raw material coated with the adhesive described above is deposited and homed to a desired thickness on a flat plate, for example, a metal plate, to form a mat shape.

The compaction is preferably carried out by hot pressure using a hot press.

When performing homing and heat pressing, it is recommended to place a piece of cloth, non-woven fabric, etc. on a metal plate in advance for homing, and then cover the homing mat with cloth, non-woven fabric, paper, etc., and heat-press it with a hot press. This is an effective method for preventing adhesives, rice husks, etc. from adhering to metal plates, press plates, etc.

The hot pressing conditions vary depending on the thickness of the product and are not particularly limited, but for example, as described above (the homed yarn is inserted between the hot press platens, the hot pressing temperature is 120° C., the pressure is 5 Kg/crrr', and the time is 40 sec/product raw material 1 m
/m/m.

[Example 1 Next, the present invention will be explained based on examples.

[Example-11 Rice husks obtained when husking rice were used, and the adhesive was 73% butadiene monomer and styrene monomer.
SBR latex with a rubber component of 68% copolymerized with a composition of 27% was used as the main ingredient, and the additives were in the following formulation.

Chemical name Solid content Blend amount SBR latex (base ingredient) 68% Noρρ, O part Anti-aging agent
60% 1.0 Sulfur 50%
2.0 Vulcanization accelerator M2 50% 1.0 // tt E Z 50% 0.5
Lead flower 50% 1
5. O isocyanate (crude MDI) (100%)3.
0 Each powdered chemical (sulfur, vulcanization accelerator, zinc white) was used as a dispersion liquid well dispersed in water.

Each agent was added to a mixer in the order shown in the table above and stirred and mixed to form an adhesive.
part (weight ratio) was applied. The rice husks coated with this adhesive are deposited to a uniform thickness on a non-woven fabric spread on a metal plate in advance to form a mat, the surface of this mat is covered with the non-woven fabric, and this is placed between hot press plates. Temperature: 120℃Pressure: 5 Kg/cm"Hour Product Pressure: 1m1
Hot pressure was applied at a rate of 40 seconds per 11 seconds.

By the above method, a rice husk board with good cushioning properties and excellent sound insulation properties was obtained.

[Example-21 90 parts of the main raw material rice husk used in Example-1 was mixed with 10 parts of sawdust wood chips obtained in the finishing process of a plywood factory as the main raw material, and the adhesive used in Example-1 was mixed. The main ingredient was a mixed latex prepared by mixing 70 parts of SBR latex with 30 parts of NBR latex, and the additives were in the following formulation.

Drug name Solid content Compounding amount SBR latex (main ingredient) 68% 70.0 parts NBR latex (main ingredient) 48% 30.0 // Anti-aging agent
60% 1,0//Sulfur
50% 2,0//vulcanization accelerator M2
50% 1,0//lt ttEZ 50% Q, 5tt sub
Lead flower 50% 1
5.0 // Glyoxal 40%
2,0//In addition, each powdered chemical (sulfur, vulcanization accelerator, zinc white) was used as a dispersion liquid well dispersed in water, and the adhesive was prepared by stirring and mixing thoroughly.

75 parts (weight ratio) of adhesive was uniformly applied to 100 parts of the main raw material, which was a mixture of rice husk and wood chips.

The main material coated with adhesive is deposited to a uniform thickness on Japanese paper spread on a metal plate to form a mat.The top surface of this mat is covered with Japanese paper as before, and this is placed between hot press plates. Temperature 120°C Pressure 5 Kg/crn”
A rice husk board with good adhesive strength and elasticity and excellent sound insulation properties was obtained by hot pressing at a time ratio of III/Il of 40 seconds.

[Example-3] 85 parts of rice husks used in Example-1 and coarsely crushed particles of styrene foam (a square cube with a side of about 511I/II+) 15
90 parts of the adhesive used in Example 1 was evenly applied to this mixture in an amount of 90 parts per 100 parts of the main material, and homing and hot pressing were performed by the method of Example 1.

As a result, a rice husk board with good cushioning properties and excellent sound insulation properties was obtained.

[Effect of the invention 1] According to the present invention, a large amount of rice hus inevitably generated in the production of staple food rice or wheat has little utility value;
Most of it was incinerated, but by utilizing the unique properties of this rice husk and combining it with an adhesive of an appropriate composition, it is possible to create a board with a porous structure that has rubber elasticity. It has great industrial significance in that it was able to provide rice husk board as a flooring material with excellent sound insulation, which was much sought after by the construction industry.

Claims (1)

[Scope of Claims] 1. Rice husk, the crushed rice husk product, or a board material containing the rice husk as the main component (hereinafter simply referred to as the rice husk raw material),
A method for producing a rice husk board, which comprises applying an adhesive, and then homing and pressing the rice husk raw material coated with the adhesive. 2. Production of the rice husk board according to claim 1, wherein the rice husk raw material is composed of rice husk and 0 to 40% by weight of cut stems or leaves of a rice plant, wood chips, or wood flour. Law. 3. The rice husk board according to claim 1, wherein the rice husk raw material is composed of rice husk and 0 to 40% by weight of crushed peanut pods or crushed rubber, plastic, or foams thereof based on the rice husk. manufacturing method. 4. The adhesive is a mixture of one or more types of synthetic rubber latexes obtained by copolymerization or homopolymerization by emulsion polymerization method with a monomer having a conjugated double bond as the main composition, or a part of the synthetic rubber latexes. The adhesive according to the patent claim is made of a mixed latex obtained by replacing rubber latex with natural rubber latex as a main ingredient, and at least an additive necessary for vulcanizing the rubber component in the latex is added to the main ingredient. A method for producing a rice husk board according to scope 1. 5. The method for producing a rice husk board according to claim 4, wherein the adhesive contains one or more of iron oxide powder, a fungicide, an insect repellent, and a flame retardant. 6. Claim 1, in which the clamping is performed by heat pressure
Method for manufacturing rice husk board as described in Section 1.