JPH09255397A - Cement formed body material and its production and producing of cement formed body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the bonding strength of a cement matrix with a woody material by sticking a particulate binding type cement particle to a woody material having a nappy surface. SOLUTION: A rotor 3 having a blade 8 provided in a treating section 6 formed from the side wall of a casing 1 and a stator 2 is rotated. Next, a mixture of the woody material with the cement powder is supplied to the heating section 6 through a pipe 10 having a stop valve 9 from a hopper 4. And a particulate binding type cement particle is formed by allowing the mixture to flow in and out the treating section 6 through the circulating passage 11 while rotating the inside of the treating section 6 at high speed by the rotation of the rotor 3 to collide to the blade 8, the inside wall of the treating section 6 and the circulating passage 11, is driven into the surface of the woody material with the napped surface to be bonded and is discharged from a discharge port 12 provided with a stop valve 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement molded body material, a method for manufacturing the same, and a method for manufacturing a cement molded body.

[0002]

2. Description of the Related Art Conventionally, wood materials such as pulp (wood fibers) and wood chips have been used as a reinforcing material or a filler in cement moldings. It is known that if the surface of such a wood material is fluffed, the bondability with cement is improved. However, even if pulp fibers are defibrated, if they are dried, the fluff will return to the original state, that is, the fluff will disappear. Therefore, when defibrated pulp fibers are used, cement particles are fixed to the pulp fibers by wet papermaking to produce a cement molded product.

For example, in Japanese Patent Laid-Open No. 147988/1993, fine powder having a positive charge is added to defibrated pulp fibers and mixed, and the mixed pulp is added to a cement mixture containing cement and silica. A technique for mixing and obtaining a cement molded product by a dry method is described. The addition of the fine powder having the positive charge is for maintaining the defibrated state of the pulp fiber. That is, if a positive charge is applied to the pulp fiber, it is possible to prevent the fluff from returning.

In Japanese Patent Laid-Open No. 4-164852, in order to improve the bondability between pulp and cement, gypsum is fixed on the surface of pulp fiber by wet papermaking to form an ethrin guide in the form of needles. It is described that pulp and cement are combined via a trin guide.

[0005]

However, in the case of the above-mentioned wet papermaking, the manufacturing process tends to be complicated, and the equipment tends to be large in terms of cost, which is not suitable for small-quantity production. Further, the finer the particles of cement, the higher the reactivity, but the cement particles easily leak through the mesh of the papermaking machine, and the fixability to pulp fibers is low. Further, the maintenance of fluff by applying the positive charge is not sufficient. Even in the case of the above-mentioned gypsum, the wet papermaking has the same problem as the case of fixing the cement particles.

[0006]

Means for Solving the Problems To solve the above problems, the present inventor mixed a wood material and cement or gypsum,
Repeatedly applying mechanical energy to this mixture while exercising it, while fluffing the surface of the wood material,
The inventors have found that the cement particles and gypsum particles can be firmly bonded to the surface of the wood material, and have completed the present invention.

<Invention of Claim 1> The present invention is characterized in that fine particle-adhering cement particles in which cement particles are adhered to the surface of cement mother particles are bonded to a woody material having a fluffy surface. It is a cement molded body material.

In the above cement molding material, the fine particle fixing type cement particles have high reactivity when molding the cement molding by the cement fine particles on the surface, and the fine particle fixing type cement particles have a fluffy surface. Since it is bonded to the woody material, the obtained cement molded product has a high bondability between the woody material and the cement matrix, and therefore has high bending strength and peeling strength.

<Invention of Claim 2> This invention is a fine particle-adhering cement particle in which cement fine particles are fixed to the surface of cement mother particles by repeatedly applying mechanical energy to a mixture of a wood material and cement. Is formed and the surface of the wood-based material is fluffed, and the fine particle-fixing type cement particles are driven into the surface of the wood-based material.

In this method, the wood-based material is repeatedly subjected to mechanical energy, so that the surface thereof is broken and fuzz (branching) occurs. On the other hand, the cement particles are subjected to the impact of mechanical energy repeatedly, so that the corners of the surface are removed, the diameter becomes smaller, and the cement particles become spherical. Then, the cement fine particles adhere to the spherical mother particles. Therefore, as large-sized cement particles are reduced, the cement fine particles are also reduced by sticking to the mother particles, and the cement has less variation in particle size, and the surface characteristics of the obtained fine particle-fixed cement particles are uniform. It becomes a thing.

Thus, the fluff of the wood material and the spheroidization / fine particle fixation of the cement particles involve the collision of the wood material and the cement particles, and the spheroidization or fluff of the wood particles is caused by the collision. As the above progresses effectively, the spheroidized fine particle-fixing type cement particles are driven into and bonded to the fluffy woody material. In this case, the bond between the wood-based material and the cement particles is due to implantation, so that the anchor effect acts on the bond to strengthen the bond.

<Invention of Claim 3> The present invention is a fine particle-adhered cement particle in which cement fine particles are fixed to the surface of cement mother particles by repeatedly applying mechanical energy to a mixture of a wood material and cement. And producing a cement molded body material having a woody material having a fluff on the surface and having the fine particle-fixing type cement particles bonded, and mixing water with the cement molded body material and applying pressure. A method for producing a characteristic cement molded product.

In the method, a cement molded article is prepared by using fine particle-fixing type cement particles having a uniform particle size and a uniform surface property, and a woody material having such cement particles bonded and a fluffy surface. Since it is molded, the bending strength and peeling strength of the obtained cement molded product are increased.

<Invention of Claim 4> The present invention is a cement molding material characterized in that plaster particles are driven into the surface of a woody material having a fluffy surface.

In the case of this cement molding material, the fluff on the surface of the wood material enhances the binding force between the wood material and the cement matrix, and the gypsum particles on the surface of the wood material act with water to cause ethrin. A guide is generated, and the action of the ethrin guide enhances the bonding force between the wood material and the cement matrix.

<Invention of Claim 5> According to the present invention, mechanical energy is repeatedly applied to a mixture of a wood material and gypsum so that the surface of the wood material is fluffed.
A method for producing a cement molded body material, characterized by driving gypsum particles onto the surface of the wood material.

In the method, the wood material is subjected to repeated application of mechanical energy to obtain fluff on the surface thereof, and the gypsum particles are driven into the surface of the wood material by collision with such wood material. Will be fixed to the surface. Since the gypsum particles are bonded to the surface of the wood material by hammering, a high bonding force is obtained by the anchor effect, and since the gypsum particles cover the surface of the wood material, the elution of the alkaline component due to the reaction with water is also possible. Less.

<Invention of Claim 6> According to the present invention, the surface of a wood material is fluffed by repeatedly applying mechanical energy to a mixture of wood material and gypsum, and the above-mentioned gypsum particles are applied to the surface of the wood material. A method for producing a cement molded product, which comprises producing a cement molded product material in which is injected, mixing the cement molded product material with cement and water, and pressing the mixture.

In the method, a wood material having a fluffy surface and a firmly fixed gypsum is mixed with cement or the like to produce a cement molded product. Due to the formation of the ethrin guide with gypsum, the binding force between the wood material and the cement matrix is increased, and the bending strength and peeling strength are high.

[0020]

According to each of the first to third aspects of the invention, the wood-based material has fine particle-fixing cement particles in which the surface of the wood material is fluffed and the cement particles are fixed to the surface of the cement mother particles. Since it is formed by bonding, or because it is to produce a cement molded body by obtaining such a cement molded body material, the reactivity of the cement particles is high, moreover, the binding force between the wood material and the cement matrix This is advantageous in increasing the bending strength and peeling strength of the cement molded product.

Further, according to each of the inventions of claims 2 and 3, the dry method of applying mechanical energy repeatedly to the mixture of the wood material and the cement is employed for treating the wood material. Compared to the wet method, the process is simpler and the equipment can be prevented from becoming larger, which is advantageous not only for large-scale production but also for small-volume production. Which is advantageous in obtaining a cement molded product having high bending strength and high peel strength.

According to the inventions of claims 4 to 6,
Since the wooden material has a fluffy surface and is plastered on the surface, or a cement molded body is produced by obtaining such a cement molded body material, the wooden material The bond strength between the cement matrix and the cement matrix is increased, which is advantageous in increasing the bending strength and peeling strength of the cement molded product.

Further, according to each of the fifth and sixth aspects of the invention, the dry method of applying mechanical energy to the mixture of the woody material and the gypsum repeatedly is used for treating the woody material. Compared to the wet method, the process is simpler and the equipment can be prevented from becoming larger, which is advantageous not only for large-scale production but also for small-volume production. Which is advantageous in obtaining a cement molded product having high bending strength and high peel strength.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION For the treatment of a mixture of the above wood material and cement or plaster, Nara Machinery Co., Ltd. trade name "Nara Hybridizer" and Tokuju Kosaku Co., Ltd. trade name "Theta. It can be performed by the so-called high-speed air current impact method using a "composer" or the like.

FIG. 1 shows a schematic structure of such a high-speed air flow impact device. In the figure, 1 is a casing, 2 is a ring-shaped stator, 3 is a rotor, 4 is a hopper for feeding material, and 5 is a material take-out port for taking out the processed material. A processing chamber 6 is formed by the side wall of the casing 1 and the stator 2, and a temperature control liquid jacket 7 is formed between the peripheral wall of the casing 1 and the outer peripheral surface of the stator 2. A blade 8 is provided on the rotor 3. The hopper 4 has a pipe 10 having an opening / closing valve 9 in the middle.
Is connected to the processing chamber 6 from the center of the side wall of the casing 1. A circulation outlet is formed in the stator 2, and a circulation passage 11 extending from the outlet is connected to the processing chamber 6 from the center of the side wall of the casing 1.
An on-off valve 12 is provided at the outlet 5.

Next, a method of manufacturing a cement molding material using the above high-speed air current impact device will be described.

While the rotor 3 is rotated, a mixture of a wood material such as wood fibers or finely cut wood pieces and cement powder is supplied to the processing chamber 6 from the hopper 4. This mixture rotates at high speed in the processing chamber 6 by the rotation of the rotor 3 and repeatedly moves in and out of the processing chamber 6 through the circulation passage 11, and the blade 8 and the inner wall surface of the processing chamber 6 as well as the circulation passage 11 are rotated. While colliding with the inner wall surface, the wooden materials collide with each other, the cement particles collide with each other, and further, the wooden material and the cement particles collide with each other while being mixed and stirred.

Due to such a collision, the wood material is repeatedly subjected to mechanical energy such as impact force, compression force, shearing force, etc., and the surface becomes fluffy, and cement particles or gypsum particles are driven into the surface. On the other hand, with respect to cement powder, when the above mechanical energy is received, cement particles having a relatively large diameter are ground at the corners and convex portions of the surface to become round mother particles. Further, between the mother particles and the cement fine particles shattered from the mother particles and the cement fine particles contained from the beginning, cohesive force is generated by the above mixing and stirring, and the surface of the mother particles is collided with each other. The fine particles are combined to form fine particle-bonded spheroidized cement particles. FIG. 2 schematically shows the spheroidized cement particles 15, in which 16 is a cement mother particle and 1 is a cement mother particle.
7 is cement fine particles.

Further, the above-mentioned cement powder or spheroidized cement particles are driven into a fluffy part or a non-fluffy part of the surface of the woody material by collision with the woody material and are bonded thereto. .

In order to produce a cement molded product, the cement molded product material is mixed with water and, if necessary, a lightweight aggregate, another wood material, cement, a hardening accelerator and the like, and the mixture is pressurized.

When gypsum powder is used instead of the cement powder, the gypsum particles are driven into the surface of the fluffy woody material by the treatment with the impact device in the high-speed air current as in the case of the cement powder, and the gypsum particles are bonded. By doing so, a cement molded product material is obtained. Then, cement and water, and if necessary, lightweight aggregate, another woody material, a curing accelerator, etc. are mixed with this cement molded body material, and the mixture is pressed to obtain a cement molded body. The gypsum powder bound to the wood material produces an ethrin guide by reacting with C ₃ A (tricalcium aluminate) in cement and water.

As the cement, ordinary Portland cement, early-strength cement, blast furnace slag cement or the like can be used.

As the woody material, wood chips, wood flour, pulp of hardwood or conifer (wood fiber), used newspaper, used cardboard, etc. can be used. Since woody long fibers are easily entangled with the rotor 3, short fibers (fiber length of 5 mm or less) are suitable as woody fibers to be treated with cement powder or gypsum powder by the above-mentioned device, and long fibers are suitable for reinforcing or retaining cement compacts. It is better to add it later for formability. Further, even such short fibers tend to be entangled with each other to form a thread while being processed by the above-mentioned apparatus, and therefore it is preferable to add wood chips or wood powder.

As the gypsum, any of anhydrous gypsum, hemihydrate gypsum and dihydrate gypsum can be used, and the addition amount is SO ₃
About 6 wt% of the amount of cement in terms of amount is suitable.

As the lightweight aggregate, pearlite, shirasu foam, or the like can be used, which makes it possible to reduce the weight of the cement molded product and improve nailability when used as a building material.

As the curing accelerator, calcium chloride or the like can be used.

[Production of Cement Compacts of Examples and Comparative Examples] <Example 1> The formulations for obtaining cement compacts are as follows. Wood pieces 12.5 parts by weight Wood fibers 25.0 parts by weight Newspaper waste paper 12.5 parts by weight Shirasu foam 100 parts by weight Early strength cement 200 parts by weight Calcium chloride 4 parts by weight Water 75 parts by weight Newspaper waste paper (average fiber length 1 mm) A cement molded body material was obtained by treating a commercially available early-strength cement with the above-mentioned high-speed air current impact device. Rotor speed is 5600
rpm, processing time is 45 seconds. The average particle size of the cement was 13.6 μm before the treatment and 12.7 μm after the treatment. The obtained cement molded body material, wood chips, wood fibers,
Shirasu foam, calcium chloride and water were put into a Loedige mixer and mixed for several minutes to form a uniform mixture. The average particle size of the wood piece is 35 mesh, the wood fiber is a cedar fiber having a fiber length of 10 to 30 mm, and the shirasu foam has a bulk specific gravity of 0.1 and an average particle size of 250 μm. The obtained mixture was sprayed to a predetermined thickness on a base, plates were stacked on the base, and pressure was applied at 10 kgf / cm ² , and curing was performed at 60 ° C. for 20 hours in the pressed state.

Comparative Example 1 A cement compact was prepared under the same conditions and method as in Example 1, except that the cement and waste newspaper were not treated with a high-speed air current impact device.

<Comparative Example 2> A cement molded product was produced under the same conditions and methods as in Example 1 except that only cement was treated by the high-speed air current impact device. The average particle size of the cement was 12.7 as in Example 1 by the above treatment.
μm.

<Comparative Example 3> In treating cement with a high-speed air impact device, the treating conditions were 8000 rpm × 60.
A cement molded product was produced under the same conditions and method as in Comparative Example 2 except that the second was set. The average particle diameter of the cement was 12.7 μm as in Example 1 after the above treatment.

<Comparative Example 4> A cement molded product was produced under the same conditions and methods as in Example 1, except that only waste newspaper was treated by the high-speed air current impact device.

Example 2 Cement molding was carried out by adding 4 parts by weight of gypsum dihydrate to the composition of Example 1 and treating the gypsum, wood chips and the above high-speed air impact device (5600 rpm × 45 seconds). I got the body material. The cement molding material, cement, wood fiber, newspaper waste paper, shirasu foam, calcium chloride and water were put into a Loedige mixer and mixed for several minutes to form a uniform mixture. A cement molded product was produced under the same conditions and method. Therefore, the cement and the waste newspaper are not treated by the high-speed air flow impact device.

Example 3 A cement molded product was produced under the same conditions and method as in Example 2, except that the treatment with the high-speed air current impact device was performed not on the plaster and wood chips but on the plaster and waste newspaper.

<Comparative Example 5> 4 parts by weight of gypsum dihydrate was added to the composition of Example 1, and a cement molded product was produced under the same conditions and method as those of Comparative Example 1.

[Evaluation of Examples and Comparative Examples] Example 1 above
Bending strength test and peeling strength test were performed for each of the cement molded products of Comparative Examples 1 to 3 and Comparative Examples 1 to 5. The results are shown in Table 1.

[0046]

[Table 1] In Example 1 in which the cement and the newspaper waste paper were treated by the high-speed air stream impact device, the bending strength and the peel strength were significantly higher than those in Comparative Examples 1 to 4 in which such treatment was not performed.

In Comparative Examples 2 and 3, only the cement was subjected to the treatment by the above-mentioned high-speed air current impact device, but an improvement in bending strength was recognized as compared with Comparative Example 1 in which such treatment was not performed. However, the value is considerably lower than that in Example 1. Regarding the peeling strength, since Comparative Example 1 and Comparative Examples 2 and 3 use the same wood-based material that influences the peeling strength, the improvement is hardly recognized.

In Comparative Example 4, only newspaper waste paper was subjected to the treatment by the high-speed air current impact device, but the peel strength was improved as compared with Comparative Example 1 in which such treatment was not performed. The value is considerably lower than that in Example 1.

As described above, even when only cement or waste newspaper is treated with a high-speed air stream impact device, improvement in bending strength or peel strength is recognized, but the degree of improvement is the same for cement and waste newspaper at the same time. Treated Example 1
Lower than. Therefore, it can be said that there is a synergistic effect in the simultaneous treatment of this cement and waste newspaper.

FIG. 3 and FIG. 4 are photographs showing fibers and cement particles of used newspapers treated by the high-speed air impact device of Example 1, in which fibers of used newspapers are fluffed and a large number of cements are present therein. It can be seen that the particles are bound together. On the other hand, FIGS. 5 and 6 are photographs showing a state in which waste paper and cement are simply mixed, and fibers of the waste paper have some fluff, which is originally caused by the waste paper. The fluff that it has, the flutter as in Example 1 is not recognized, and the amount of cement particles attached is small.

Also, looking at the results of Comparative Examples 2 and 3, since there is no great difference in the bending strength, regarding the processing conditions in the high-speed air impact device, the rotor rotational speed was 5600 rp.
It can be said that the length can be set to m or more, or the processing time can be set to 45 seconds or more, but the bending strength of Comparative Example 3 in which the rotation speed of the rotor is increased and the processing time is lengthened is slightly lower. Therefore, it can be said that it is not preferable to excessively increase the rotation speed of the rotor or excessively increase the processing time.

Next, looking at Examples 2 and 3 and Comparative Examples 1 and 5, it can be seen from the comparison between Comparative Example 1 and Comparative Example 5 that addition of gypsum is effective in improving bending strength. In Examples 2 and 3 in which the material and gypsum were treated with a high-speed air current impact device, the bending strength and peeling strength were significantly higher than in Comparative Example 5. In addition, comparing Example 2 and Example 3, the latter has higher peel strength, but this is because newspaper wastepaper is fibrous and has more fluff than wood chips and plaster or cement. It is thought that it is easy to get entangled with.

FIG. 7 shows a piece of wood and gypsum treated by the high-speed air impact device of Example 2. The temporary conduit of the piece of wood was broken and fluff was observed, and gypsum particles were found in it. The plaster and wood chips get inside and are firmly bonded. In addition,
The fluff of this piece of wood is not a fine feather like the case of used newspaper, but the surface is disturbed by the destruction of the temporary conduit and it becomes uneven. On the other hand, FIG. 8 shows a state in which the wood chips and the gypsum are simply mixed. Although the gypsum is clinging to the wood pieces (the white mist on the surface of the wood pieces is the gypsum), it is simply attached. It is easy to remove just by doing.

FIG. 9 shows waste newspaper and gypsum treated by the high-speed air impact device of Example 3, and it can be seen that the fibers of the waste newspaper have many fluffs. The gypsum is not very visible, but it is attached to the fluff portion of the fiber. On the other hand, FIG. 10 shows a state in which waste newspaper and gypsum are simply mixed, but fibers of waste newspaper are less fluffed.
Comparing No. 3 with each other, Example 1 in which the cement and the woody material are treated by the high-speed air current impacting device shows a better result. In the case of Example 1, the whole amount of cement was treated by the above-mentioned device, so that the wood-based material and the cement were directly bonded, and the bonding condition was extremely good as a whole. In Examples 2 and 3, as a result of the good bond between the gypsum and the wood material, the bondability between the wood material and the cement is improved through the gypsum, but since the absolute amount of the gypsum is small, it is conceivable that. Instead, gypsum is advantageous in terms of productivity and cost because it requires only a small amount of treatment by the above-mentioned device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a high-speed air flow impact device.

FIG. 2 is a sectional view showing spheroidized cement particles.

FIG. 3 is a photomicrograph at 100 × magnification showing the fiber shape and cement particles of waste newspaper processed by a high-speed air impact device.

FIG. 4 is a micrograph at a magnification of 500 showing fiber shapes and cement particles of newspaper waste paper treated by a high-speed air stream impactor.

FIG. 5: Magnification of 100 showing the fiber shape and cement particles of waste newspaper not treated by the high-speed air impact device.
Photomicrograph at magnification.

FIG. 6 is a magnification of 500 showing the fiber shape and cement particles of waste newspaper that has not been treated by a high-speed air impact device.
Photomicrograph at magnification.

FIG. 7 is a photomicrograph at 100 × magnification showing the fiber shape (texture) and gypsum particles of a piece of wood treated by a high-speed air impact device.

FIG. 8: Magnification of 100 showing the fiber shape (texture) and gypsum particles of a piece of wood that has not been treated by a high-speed air impact device
Photomicrograph at magnification.

FIG. 9 is a photomicrograph at 80 × magnification showing the fiber shape and gypsum particles of waste newspaper treated with a high-speed air impact device.

FIG. 10 is a micrograph at 80 × magnification showing the fiber shape (texture) and gypsum particles of waste newspaper that has not been treated by a high-speed air impact device.

[Explanation of symbols]

 1 casing 2 ring-shaped stator 3 rotor 4 material input hopper 5 material outlet 6 processing chamber 7 jacket 8 blade 9 open / close valve 10 pipe 11 circulation passage 12 open / close valve 15 spheroidized cement particle 16 cement mother particle 17 cement fine particle

Claims (6)

[Claims] 1. A cement molded product material, characterized in that fine particle-fixing type cement particles in which cement fine particles are fixed to the surface of cement mother particles are bonded to a wood material having a fluffy surface. 2. By repeatedly applying mechanical energy to a mixture of a wood material and cement, fine particle-adhered cement particles in which cement particles are fixed to the surface of cement mother particles are formed, and the surface of the wood material is fixed. A method for producing a cement molded product material, which comprises implanting the fine particle-fixing type cement particles on the surface of the wood material while fluffing. 3. A fine particle-fixing type cement particle in which cement fine particles are fixed to the surface of cement mother particles by repeatedly applying mechanical energy to a mixture of a wood material and cement, and there is flicker on the surface. A method for producing a cement molded product, which comprises producing a cement molded product material having a wood material to which the fine particle-fixing cement particles are bonded, mixing water with the cement molded product material, and pressurizing the mixture. 4. A cement molded body material, wherein gypsum particles are driven into the surface of a woody material having a fluffy surface. 5. A cement molded product, characterized in that by repeatedly applying mechanical energy to a mixture of a wood material and gypsum, the surface of the wood material is fluffed and gypsum particles are driven into the surface of the wood material. Material manufacturing method. 6. A cement compact material obtained by fluffing the surface of a wood material by repeatedly applying mechanical energy to a mixture of the wood material and gypsum, and implanting the gypsum particles on the surface of the wood material. A method for producing a cement molded product, which comprises manufacturing, mixing the above cement molded product material with cement and water, and pressing.