JP2002020148A - Recycled forming material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycled forming material which is inexpensive and enables further effective utilization of destruction rubbish. SOLUTION: This recycled forming material contains, as its essential components, 20-70 wt.% of a powdery material obtained by crushing/grinding woody cement board destruction rubbish into powdery particles having <150 μm particle size, and a synthetic resin, wherein as the synthetic resin, any of polyethylene resins, polypropylene resins, PET(polyethylene terephthalate) resins recycled from PET bottles, etc., can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recycled molded material which is mainly made of waste wood cement boards and can be used as a building material.

[0002]

2. Description of the Related Art Conventionally, building waste generated by dismantling or partially remodeling buildings, building waste generated as cutting waste during construction, and waste generated during the manufacturing process (hereinafter referred to as "waste").
Are collectively reused or recycled. However, most waste materials are still being landfilled at final disposal sites as stable or managed waste.

[0003] For this reason, in recent years, attempts to separate and collect such waste materials for further reuse have become active. In particular, among the waste materials, wood-based cement boards specified in JIS-A-5404 consume a large amount in the construction industry and a large amount of waste materials, so that effective reuse is desired.

[0004]

However, the above-mentioned wood-based cement boards are made of wood materials having characteristics such as burning, rotting, fibrous, light, etc., and non-burning, non-rotating, hardened, hard, etc. And the cementitious material were unified, and it was difficult to separate the material from the woody material and the cement material.

[0005] Therefore, attempts have been made to add a pulverized material obtained by pulverizing and collecting the above-mentioned waste wood-based cement board as an extender of a raw material for manufacturing the wood-based cement board. However, when a large amount of the above-mentioned pulverized material is added, the strength of the wood-based cement board is significantly reduced.
Only about 0% by weight could be added, and there was a limit to reuse.

[0006] Further, the wood cement board has a problem in that although it is a general-purpose material that is mass-produced and has a low added value, the processing cost such as collection and grinding of the waste material is high. For this reason, in the reuse of wood-based cement board waste material, which is expected to increase in the future, it has been strongly desired to reduce the processing cost.

The present invention has been made in view of such a conventional problem,
An object of the present invention is to provide an inexpensive recycled molding material that can utilize waste materials more effectively.

[0008]

In order to achieve the above object, a recycled molded material according to the present invention has a powdery material obtained by grinding or grinding a wood-based cement board waste material in an amount of 20% by weight to 70% by weight. And a synthetic resin as essential components. For this reason, the use amount of the wood-based cement board waste material is increased, the utilization rate is improved, and many raw materials can be covered by the waste material, so that an inexpensive recycled molding material can be obtained. In addition, compared to a molded product made of a synthetic resin alone, a unique soft texture and texture can be exhibited by mixing a woody material. Furthermore, since the cement material is mixed, a recycled molded material having a high Young's modulus and excellent rigidity can be obtained, while having a small coefficient of linear expansion due to heat. In particular, a molded material having a low coefficient of linear expansion due to heat and a high rigidity as well as a flame retardancy and a feeling of weight can be obtained as compared with a case where wood powder alone is hardened with a synthetic resin.

It is to be noted that a molding material formed by adding wood powder to a synthetic resin is also known. However, in the case of such a composite molding material of the synthetic resin and the wood powder, a small piece of wood made of a soft wood fiber is used. It takes a long time to pulverize the powder into wood powder, and a considerable amount of fibrous material remains which is difficult to mix into the synthetic resin. Further, it is difficult to uniformly mix a large amount of wood flour alone with a synthetic resin and mold it. However, if the wood-based cement board waste material of the present application is used, a large amount of crushed cement material is mixed with the wood material and strongly rubbed, so that the wood material can be efficiently crushed into a powder. Therefore, a large amount of powder can be uniformly mixed with the synthetic resin and molded.

It is preferable to use a powder having a particle size of less than 150 μm. According to this, the surface of the obtained molded product has a fine grain and a good appearance. In particular, when a powder having a particle size of less than 70 μm is used, the mixing property with the synthetic resin and the moldability are improved, and the appearance of the molded material can be further enhanced.

Further, the woody material of the powdery material may have a higher weight ratio than the cement material of the powdery material. According to this, the ratio of the woody material is increased, and the soft texture and the texture can be further improved, and the workability such as cutting can be improved. In particular, when a powdery material having a high ratio of a woody material having good adhesion to a synthetic resin is used, even when the amount of the powdery material is set to 50% by weight or more, deterioration in strength properties and dimensional stability is small. Also, mixing and molding can be performed well.

The recycled molded material according to the present invention includes:
As a powdery material, a material obtained by adding a wood chip to a wood-based cement board waste material and pulverizing or grinding it may be used. According to this, the weight ratio of the wood material can be increased, and the same effect as the above-described effect can be exerted by a simpler method.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The recycled molded material according to the present invention comprises, as essential components, a powdery substance obtained by grinding or grinding a waste material of a wood cement board and a synthetic resin.

As the wood cement board, JIS-A-
5404 (1998). That is, the wood-based cement board is a board that is compression-molded using a wood raw material such as wood wool or a piece of wood and cement, and is mainly used for walls, floors, ceilings, roofs and the like of buildings.
The above-mentioned wood-based cement board is roughly classified into a wood chip cement board used mainly for an outer wall material and a field board, and a wood wool cement board used for a fire and heat insulating base material for a roof and walls. More specifically, a hard wood chip cement board, a normal wood chip cement board, a hard wood wool cement board, and a normal wood wool cement board are exemplified. It is needless to say that the wood-based cement board specified in JIS can be used in the present invention, but the present invention is not limited to this. It corresponds to a system cement board and can be used in the present invention.

[0015] The waste material according to the present invention includes, as described above, not only construction waste material generated when a building is dismantled or renovated, but also scrap materials generated by cutting during construction and wood-based cement boards. Refers to scraps generated.

The method of pulverizing or grinding the waste material of the wood cement board to obtain a powdery material is not particularly limited as long as it can be pulverized into a fine powdery material. For example, a hammer mill, a roller mill, a disc mill, a ball mill, or a combination thereof may be used for pulverization. Further, the waste material may be roughly pulverized before being pulverized by the above-mentioned mill. As a means for coarse pulverization, for example, a rotary cutter crusher can be used.

When only wood-based materials are crushed,
Since the woody material is soft woody fiber, it takes a long time to pulverize it into a fine powder, and a large fibrous material remains even after classification, resulting in poor pulverization efficiency. However, when pulverizing a wood cement board as in the present invention, the hard cement itself pulverized by the pulverizing means in the mill can be used without adding a hard inorganic material such as calcium carbonate or titanium oxide. Rubs strongly against the wood material, while the wood material itself is easily mixed with the cement powder and easily crushed. For this reason, the wood material can be crushed faster, finer, and more non-fibrous, and the crushing efficiency is significantly improved. Further, the finely pulverized powdery material has less large fibrous woody material, has a good pulverization yield, is easily mixed with many synthetic resins, and is excellent in mixability and moldability. The particle size of the pulverized powder is preferably less than 150 μm. In particular, a fine powder having a particle size of less than 70 μm improves the mixability, moldability and surface appearance after molding. More preferred.

Before the wood-based cement board waste is pulverized, wood chips are added in advance. For example, the wood chips are pulverized by a hammer mill, and the pulverized material contains a large amount of wood material in the pulverization process. Is also good. According to this method, it is not necessary to add the woody material in a separate step, so that the manufacturing process can be simplified, and there is an advantage that most of the waste material of the woody cement board can be effectively used.

The powdery material is not limited to one obtained by directly pulverizing a waste material of a wood-based cement board, but may be one obtained by classifying and sorting so as to include a large amount of woody material. As the classification and sorting, there is a method of classifying using, for example, gravity and wind force or vibration force by utilizing a difference in specific gravity between the wood material and the cement. Classification by gravity and wind force is to send a wind from the side to the falling powder material to deposit heavy and coarse cement material in front, and to deposit a mixture of light and fine cement material and wood material in the distance It is a method of classifying according to. The method of classifying by vibrating force means that a powdery substance is put in a container with a discharge port below, and the container is vibrated to leave a light mixture of wood powder mixed with cement powder on top, This is a method of classifying large heavy objects by discharging them from below. By removing excess cement by classification in this way, the ratio of woody material in the powdered material can be relatively increased, or the ratio of woody material and cement material can be increased from various types of woody cement waste wood. A homogeneous powder can be obtained. As a result, it is possible to stabilize the manufacturing conditions such as the quality of the recycled material, the mixing property with the synthetic resin, and the moldability.

The amount of the powder is 20 to 70% by weight, preferably 30 to 60% by weight. If the proportion of the powdery substance is less than 20% by weight, the appearance of a unique soft texture and texture will be poor.
This is because, when it exceeds, mechanical strength such as bending strength is reduced. However, in the case where the pulverized material is used without being classified and sorted, there is a possibility that a coarse woody material may be partially mixed.
For this reason, in order to maintain good mixing and moldability and the surface properties and strength of the recycled molded material, the content is preferably about 20% by weight to 50% by weight.

Although the wood-based cement board waste material varies depending on the type, the wood-based cement board contains about 30% by weight of the wood material, and the cement material is heavier in weight. For this reason, when imparting a texture or texture different from that of plastic to the recycled molded material, the ratio of the woody material in the powdery material is increased to 50% by weight or more by the classification and the addition of wood chips as described above. It is desirable to keep it.

As the synthetic resin, a thermoplastic synthetic resin can be used, for example, polyethylene resin, polypropylene resin, vinyl chloride resin, polyester resin, ABS resin (acrylonitrile-butadiene-styrene resin) and the like.
Also, recycled plastics such as polyethylene terephthalate resin (PET resin) recycled from PET bottles and ABS resin recycled from home appliances may be used. Further, these synthetic resins may have foaming properties. For the foaming property, a known means such as mixing a foaming agent made of an azo compound with a mixture of a synthetic resin and a powdery substance in an amount of 1 to 2% by weight can be used. Thereby, a foaming type recycle molding material can be formed. In addition, the recycled molding material can be colored to an arbitrary color by adding a coloring agent such as a coloring pigment.

Next, a method for producing a recycled molded material according to the present invention will be described. First, a synthetic resin is added to a powder obtained by pulverizing waste wood from a wood cement board to obtain a mixture. As a method for obtaining the mixture, for example, a strand cut method can be used. In this method, a predetermined amount of a powdery substance and a synthetic resin are weighed, then put into an extruder, heated and mixed to extrude a udon-shaped strand, which is cooled and cut into a predetermined length. This is a method of forming pellets. Further, a pelletizer such as a cold cut method or a hot cut method may be used.

Next, the obtained mixture is molded to obtain a recycled molded material. As a molding method, a general extrusion molding method, an injection molding method, and a flat plate press molding method can be applied.
For example, the pellets are supplied to an extruder, heated and re-melted to form. At this time, the recycled molding material
It can be formed not only into a plate-like body having a smooth surface, but also into a molded article having high added value such as a molded article having irregularities and a three-dimensional molded article having an irregular shape.

The recycled molded material formed by the above-mentioned manufacturing method is formed by mixing and integrating a powdery material obtained from a wood cement board, a wood chip or the like with a synthetic resin. For this reason, recycled molded articles having high recyclability can be obtained, and articles of various shapes can be obtained by extrusion molding, injection molding, or the like. As a result, when used as building materials,
It can be used for various applications such as handrails, skirting boards, sills, lintels, door frames, window frames, parting materials, etc., as well as deck materials, furniture end panels, picture frames, corner materials, counters, etc.

[0026]

EXAMPLES (Example 1) As a wood-based cement board waste material, offcuts generated during construction of an outer wall material made of a hard wood chip cement board were used. First, the remnants were roughly pulverized by a rotary cutter crusher to obtain a coarsely pulverized product, and the coarsely pulverized product was further finely pulverized by an impact hammer mill, and finally finely pulverized by a ball mill to obtain a finely pulverized product. .

This finely pulverized product is sieved to a particle size of 100 μm.
The following powder was obtained. This powdery material had a weight ratio of wood material to cement of approximately 30 to 70. Then, a small piece of polyethylene resin waste material (a thin plate having a size of about 5 mm square) is added to the powdery material as a synthetic resin and mixed.
A mixture having a powdery content of 30% by weight was obtained. This mixture was formed into pellets by the above-mentioned strand cut type pelletizer.

Next, the pellets were extruded by an extruder to obtain a hollow plate-shaped regenerated material 1 shown in FIG. 1, which was used as a sample. The external dimensions of the sample are the maximum thickness 30 mm, the maximum width 200 mm, and the thickness 6 m
m, the height of the hollow part 2 is 18 mm, and the width is 24 m
m. And on the surface of the sample, width 5mm,
The grooves 3 having a depth of 1 mm are formed in parallel at intervals of 5 mm. The substantial specific gravity of the substantial part excluding the hollow part was 1.13. Further, physical properties were measured, and the measurement results were shown in FIG.
Shown in

(Comparative Example) A plate-like body formed into the same shape by the same manufacturing method using the polyethylene resin alone used in Example 1 was used as a sample. Physical properties were measured, and the measurement results are shown in FIG.

As is clear from FIG. 2, Example 1 has a lower proportional limit than the comparative example, but there is no practical problem if the application is appropriately selected. Example 1 has a smaller amount of deflection and a smaller coefficient of linear expansion than the comparative example. Therefore, Embodiment 1
According to this, it was found that a recycled molded material that is hardly deformed and has little thermal deformation can be obtained.

Example 2 The same waste wood-based cement board as used in Example 1 was pulverized by the same method to obtain a powder. This powdery material, as described above,
The weight ratio between the wood material and the cement material was approximately 30 to 70. Then, the obtained powdery material was dropped from the upper part of the chamber, and a wind of 15 m / sec was blown to make relatively coarse and heavy cement particles fall, and fine and light cement powder and wood powder were dropped far away. Further, a powdery material corresponding to about 75% by weight of the whole was taken out from the finer one of the falling objects, and sieved to obtain a powdery material having a particle size of 100 μm or less. The powdery material thus obtained had coarse cement particles and particles exceeding 100 μm removed, and was about 70% by weight of the original woody cement waste material.
The ratio between the wood material and the cement material was 40:60 by weight. Then, 50% by weight of this powder and 50% by weight of the polyethylene resin used in Example 1 were mixed and treated in the same manner as in Example 1 to obtain a plate-like recycled material, which was used as a sample. The external dimensions of this sample are shown in Example 1.
Is the same as The physical properties were measured, and the measurement results are shown in FIG.

As is clear from FIG. 3, according to Example 2, it was found that a recycled molded material that is hardly deformed and has little thermal deformation can be obtained.

[0033]

According to the present invention, more wood-based cement board waste can be effectively used than in the conventional example, so that the resources can be further reused. Further, by effectively utilizing the waste material, there is an effect that the raw material cost can be saved and an inexpensive recycled molded material can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a plate-shaped recycled material according to an embodiment of the present invention.

FIG. 2 is a table showing measurement results of Example 1 and Comparative Example.

FIG. 3 is a table showing measurement results of Example 2.

[Explanation of symbols]

 Reference numeral 1 denotes a plate-shaped reclaimed material; 2 a hollow portion; 3 a groove.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 101/00 (C04B 26/04 C // (C04B 26/04 18:16 18:16 18:26) 18:26) B09B 5/00 FF term (reference) 4D004 AA31 BA02 CA04 CA07 CB13 CB16 CC15 CC17 DA02 DA03 DA10 DA20 4J002 AH00X BB03W BB12W BD04W BN15W CF00W CF06W DM006 GL00

Claims (4)

[Claims] 1. A reclaimed molded material comprising, as essential components, 20% to 70% by weight of a powder obtained by grinding or grinding wood-based cement board waste and a synthetic resin. 2. The reclaimed material according to claim 1, wherein the particle size of the powder is less than 150 μm. 3. The recycled molding material according to claim 1, wherein the woody material of the powdery material has a higher weight ratio than the cement material of the powdery material. 4. The recycled molded material according to claim 1, wherein the powdery material is obtained by adding a wood chip to a wood-based cement board waste material and pulverizing or grinding it.