JP2003342049A - Reclaimed material and its production method, and inorganic board prepared by using the reclaimed material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclaimed material which can be compounded in an increased amount into an inorganic board and can keep the material balance and its production method; and an inorganic board prepared by using the reclaimed material. <P>SOLUTION: This reclaimed material is prepared by grinding a waste material of an inorganic board. The freeness of fibers contained in the reclaimed material is 50% or higher of the freeness of new reinforcing fibers contained in the inorganic board. The solid component contained in the reclaimed material has a particle size of 100 μm or less. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The invention of the present application relates to a recycled material, a method for producing the recycled material, and an inorganic plate using the recycled material. More specifically, the invention of this application
The present invention relates to a recycled material capable of increasing the amount of compounding to an inorganic plate raw material and maintaining a material balance, a manufacturing method thereof, and an inorganic plate using the recycled material.

[0002]

2. Description of the Related Art A large amount of waste materials such as scraps of inorganic plates and defective products are generated in the process of manufacturing the inorganic plates and at the time of site construction. In the past, these were treated as industrial wastes, but recently, from the viewpoints of resource depletion, environmental protection, and cost, various attempts have been made to reuse these waste materials as raw materials.

As a method for reusing this inorganic plate, for example, a method is generally used in which waste materials such as scraps of the inorganic plate and defective products are pulverized into a fine powder to be a recycled material, and the recycled material is mixed with the raw material. It is being appreciated. In this method, the amount of recycled material to be mixed is at most 20 because of the problem of the strength reduction of the obtained inorganic plate.
It is suppressed to about%.

[0004]

However, in consideration of the amount of waste materials such as scraps of inorganic plates and defective products that are recovered from the site in addition to those generated in the manufacturing process, blending of recycled materials into raw materials is considered. If the amount is not about 30%, the material balance between the amount of recycled material and the amount of recycled material cannot be achieved at present.

Therefore, the invention of this application has been made in view of the circumstances as described above, and it is possible to solve the problems of the prior art, increase the compounding amount to the inorganic plate raw material, and to improve the material balance. It is an object of the present invention to provide a recycled material capable of maintaining the above-mentioned properties, a method for producing the recycled material, and an inorganic plate using the recycled material.

[0006]

Therefore, the invention of this application provides the following invention in order to solve the above problems.

That is, first of all, the invention of the present application is a new reinforcer which is a recycled material obtained by crushing waste material of an inorganic plate, and in which the freeness of the fibers contained in the recycled material is compounded in the inorganic plate. Disclosed is a recycled material having a freeness of fibers of 50% or more and a particle size of a solid content of the recycled material of 100 μm or less.

The invention of this application relates to the above-mentioned first invention, and secondly, the alkali elution amount of the fiber component contained in the recycled material is the alkali elution of the new reinforcing fiber mixed in the inorganic plate. Thirdly, the recycled material is characterized by being 80% or less of the amount, thirdly, the solid content is attached to the fiber content of the recycled material, and the attached amount of the solid content is as a weight ratio,
Fiber content: adhering solid content = 50: 50 to 30:70, and fourthly, this recycled material was used.
Recycled material characterized by the residual amount on the sieve when it is sieved with 0 mesh, and fifthly, the amount passed through the sieve when this recycled material is sieved with 100 mesh Sixth, a recycled material is provided as a raw material for the inorganic plate, which can be blended in an amount of 30% or more by solid content weight.

[0009] In a seventh aspect of the invention of this application, the waste material of the inorganic plate is such that the freeness of the fiber component contained in the inorganic plate is 50% or more and the particle size of the solid content contained in the inorganic plate is 1%.
Eighth, there is provided a method for producing a recycled material, which is characterized in that the recycled material is pulverized to have a particle size of not more than 00 μm.

In addition, the invention of this application is, ninthly, to provide an inorganic plate characterized in that the recycled material described in any of the above is used as a raw material.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the characteristics as described above, and the embodiments thereof will be described below.

The inventors of the present application have conducted earnest studies on the adjustment of recycled materials using scrap materials of inorganic plates and scrap materials such as defective products, and as a result, "Powderization of waste materials = fiber and solid content are powdery." By eliminating the conventional idea of `` crushing into pieces '' and crushing the fibers in the waste material so as not to hurt as much as possible, the adverse effect on the strength and productivity of the inorganic plate obtained by using this recycled material is reduced, and recycled. It has been found that the compounding amount of the material can be increased to about 30%.

That is, the recycled material of the invention of this application is a recycled material obtained by pulverizing the scrap material of the inorganic plate and the waste material such as defective products, and the fiber component containing the reinforcing fiber which is blended in the inorganic plate, and other materials. The solid content of the recycled material is 50% or more of the freeness of the new reinforcing fiber, and the particle size of the solid content of the recycled material is 10% or more.
It is characterized by being 0 μm or less.

Here, the freeness (freeness) is an index showing the water drainage of the fiber, and the smaller the value is, the more the fiber is pulverized. Then, in the invention of this application, this freeness is used as an index for evaluating the characteristics of the fiber length distribution and the specific surface area of the reinforcing fibers in the recycled material, and the freeness of the fibers contained in this recycled material is mixed with the inorganic plate. By crushing so as to be 50% or more of the freeness of the new reinforcing fiber that has been used,
The fibers in the waste wood are crushed so as not to damage them.

If the waste material is not sufficiently pulverized, it will be difficult to use it as a recycled material, and the properties such as strength of the inorganic plate manufactured using this recycled material will be significantly deteriorated. Therefore, in the invention of this application, the particle size of the solid content in the recycled material is 1 in addition to the above-mentioned freeness of the fiber content.
The regulation is set so that the thickness is 00 μm or less.

This makes it suitable for use as a recycled material, and when the recycled material is blended in the raw material of the inorganic plate, the fiber content can exhibit strength almost equal to that when only new reinforcing fiber is used. Therefore, the solid content fills the gaps between the cement particles used as the main raw material, and a high-strength and dense inorganic plate can be obtained.

In the recycled material of the invention of this application, the alkali elution amount of the fiber component is suppressed to 80% or less of the alkali elution amount of the new reinforcing fiber. It is known that the alkaline component eluted from the reinforcing fiber inhibits the hardening reaction of cement, but in this recycled material, the amount of alkali elution is suppressed, so that the effect of promoting the hardening reaction of cement can be obtained. It will be.

In the recycled material of the invention of the present application as described above, the solid content is attached to the fiber content, and the amount of the solid content attached is expressed as a weight ratio of fiber content: adhered solid content = 5.
It is realized as a range of 0:50 to 30:70.
While the solid content is attached to the fiber content of the recycled material, by setting the amount of the solid content to be within a specific range,
When this recycled material is blended with the raw material of the inorganic plate, the characteristics of the fiber are sufficiently expressed, and the binding force between the fiber component and the cement is enhanced.

Further, in the reclaimed material of the invention of this application, each of the above reclaimed materials can be used as a new reclaimed material by dividing the reclaimed material into a residual amount on the sieve and a passing amount through the sieve. it can. The residue on the sieve is mainly composed of fibers to which solids are attached, and exhibits a reinforcing effect equal to or higher than that of a new reinforcing fiber. Further, the sieve-passed portion is mainly composed of solid content and has a small fiber content, so that it can be applied to foreign materials other than the inorganic plate, such as fertilizers, tiles, bricks, etc., and the reuse range can be expanded.

The recycled material of the invention of this application having the above-mentioned excellent properties can be blended as a raw material for the inorganic plate in an amount of 30% or more by weight of solid content. In the past, when the solid content was more than 20%, physical properties such as strength of the obtained inorganic plate were significantly deteriorated.
The recycled material of the invention of this application allows about 30% of compounding, and the material balance between the recycled material amount and the recycled amount can be achieved.

The inorganic plate using this recycled material as a raw material is superior in properties such as strength to those used with the conventional recycled material, and is also comparable to the inorganic plate using only new material. There is no such thing.

In the reclaimed material of the invention of this application, the waste material of the inorganic plate has a freeness of the fiber component contained in the inorganic plate of 50% or more, and the particle size of the solid content contained in the inorganic plate is 10%.
It can be manufactured by pulverizing so as to be 0 μm or less.

In general, crushing is performed by applying an external force such as compression (push), impact (tap), shear (cut, fold) or grinding (rubbing, crushing) to a solid to break it into particles having a smaller particle size than the original. Or, it means powdering, and many commonly used crushers combine these external forces to crush. In the conventional production of recycled materials, as a crushing apparatus for waste material of inorganic plates, a hammer mill that is a medium-speed rotary impact type crushing rotor and crushes by compression and shearing force is widely used. . However,
In the invention of this application, in order to perform the pulverization as described above, the pin mill type pulverization that minimizes the cutting of the fiber due to the impact and the pulverization due to the attrition force and obtains a high disaggregation / dispersion effect is obtained. The use of a machine is shown as a preferred example. According to this pin mill type pulverizer, the temperature rise due to pulverization is small, the particle size distribution of the pulverized product is sharp, and the pulverized particle size can be easily selected. As a result, the freeness drop (decrease in freeness value) is suppressed, so that the freeness of the fiber component contained in the inorganic plate is 50 times that of the new reinforcing fiber.
%, And the particle size of the solid content is 100μ
It can be pulverized to have a particle size of m or less.

Embodiments of the present invention will be described below in more detail with reference to the accompanying drawings.

[0025]

EXAMPLES (Examples 1 to 3) Recycled materials were produced by crushing mill ends generated in the process of manufacturing an inorganic plate using pulp as reinforcing fibers with a pin mill crusher. When the fiber content was recovered from a part of this recycled material and the freeness was measured, it was 50% or more of the freeness of the new pulp. The solid content has an average particle size of 100 μm.
It was confirmed to be stable below.

For comparison, a recycled material was prepared by crushing with a hammer mill crusher as in the conventional case. When the fiber content was recovered from a part of the recycled material in this case and the freeness was measured, it was 40% or less of the freeness of the new pulp. Further, regarding the solid content, the average particle diameter exceeded 100 μm, and the large one contained several mm.

0-30% of these recycled materials are mixed in the raw material to form a slurry, which is molded by a paper-making method and pressure-molded by a dehydrating press, and then natural curing and 170 ° C. autoclave curing are performed to form an inorganic plate. Manufactured.

The productivity, bending strength, and durability of these inorganic plates were examined, and the results are shown in Table 1. Durability was evaluated by examining the degree of swelling of the inorganic plate after the freeze damage resistance test according to the ASTM-B method.

[0029]

[Table 1]

When the conventional recycled material is used, when the compounded amount of the recycled material is 20% or less, an inorganic plate having excellent productivity, strength and durability can be obtained, whereas the recycled material of the invention of this application is used. It was found that when the material was used, an inorganic plate having good productivity, strength, and durability could be obtained even when the compounding amount was 30%. (Example 4) The regenerated material obtained by the pin mill type pulverizer was passed through a 100-mesh sieve in the same manner as in Examples 1 to 3, and the portion remaining on the sieve (hereinafter referred to as the regenerated material fiber portion) was recovered.

The degree of elution of this recycled material fiber content and the alkaline component of the new pulp was examined, and the results are shown in FIG. The alkali elution degree of this recycled fiber is 8 times that of new pulp.
It was confirmed to be 0% or less.

When an inorganic plate was prepared by using these recycled material fiber components and new pulp, the inorganic plate was hardened by using the recycled material fiber components as compared with the case where new pulp was used. It was confirmed that the degree was fast.

Using recycled fiber and fresh pulp, the pulp was sufficiently cured to prepare an inorganic plate, and its tensile strength was measured. The results are shown in Fig. 2. From Figure 2,
It has been shown that the recycled material of the invention of this application can obtain the same effect of improving the tensile strength as that obtained by using a new pulp, even if only the recycled fiber content is used. (Example 5) The fiber content of the recycled material obtained in Example 4 was subjected to thermal analysis, and the weight of the fiber component and the weight of the solid component such as cement were calculated from the results, and the results are shown in Table 2.

[0034]

[Table 2]

It was found that the recycled material fiber component in the recycled material of the invention of this application contains not only fibers but also solid components. (Example 6) Similar to Examples 1 to 3, the regenerated material obtained by the pin mill type pulverizer was passed through a 100-mesh sieve, and the portion that passed through the sieve (hereinafter referred to as regenerated material solid content) was recovered.

An inorganic plate was prepared by using the solid content of the recycled material, and the tensile strength was measured. The results are shown in Fig. 3.

For comparison, an inorganic plate was similarly prepared using a conventional recycled material, and the tensile strength was measured.

From FIG. 3, it can be seen that the inorganic plate using the recycled material solid content of the invention of the present application has an excellent strength improving effect with the tensile strength exceeding 5 MPa even when the compounding amount is 40%. Was shown.

Of course, the invention of this application is not limited to the above, and it goes without saying that various aspects are possible in details.

[0040]

As described in detail above, according to the invention of this application, a recycled material capable of increasing the compounding amount in the inorganic plate raw material and maintaining a material balance, a method for producing the recycled material, and a recycled material thereof. The used inorganic plate is provided.

[Brief description of drawings]

FIG. 1 is a diagram exemplifying a regenerated material fiber content and an alkali elution degree of pulp.

FIG. 2 is a diagram exemplifying the tensile strength of an inorganic plate containing a recycled material fiber content and pulp.

FIG. 3 is a diagram exemplifying the tensile strength of an inorganic plate containing a recycled material solid content and a conventional recycled material.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Shimada             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Yoshinori Hagimoto             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation (72) Inventor Takashi Morita             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works             Within the corporation F-term (reference) 4G012 PA22 PA30

Claims (9)

[Claims] 1. A recycled material obtained by pulverizing waste material of an inorganic plate, wherein the freeness of the fiber component contained in the recycled material is 50% or more of the freeness of the new reinforcing fiber blended in the inorganic plate, and A recycled material having a particle size of solid content of 100 μm or less. 2. The recycled material according to claim 1, wherein the amount of alkali elution of the fiber component contained in the recycled material is 80% or less of the amount of alkali elution of the new reinforcing fiber. 3. The solid content adheres to the fiber content of the recycled material, and the adhered amount of the solid content is a weight ratio of the fiber content:
Adhered solid content = 50: 50 to 30:70, The recycled material according to claim 1 or 2, characterized in that: 4. A recycled material, which is a residual amount on the sieve when the recycled material according to claim 1 is passed through a 100-mesh sieve. 5. A recycled material, which is the amount of the recycled material according to any one of claims 1 to 3 that has passed through a sieve of 100 mesh. 6. As a raw material for the inorganic plate, the solid content is 3 by weight.
The recycled material according to any one of claims 1 to 5, which can be blended in an amount of 0% or more. 7. Regeneration, characterized in that waste material of an inorganic plate is pulverized so that the freeness of the fiber content contained in the inorganic plate is 50% or more and the particle size of the solid content contained in the inorganic plate is 100 μm or less. Method of manufacturing wood. 8. The method for producing a recycled material according to claim 7, wherein the material is crushed by a pin mill crusher. 9. An inorganic plate, wherein the recycled material according to claim 1 is used as a raw material.