JPS6168378A - Lightweight inorganic board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The invention relates to lightweight inorganic plate-like bodies using hydraulic cement as a binder, and is mainly used as interior and exterior wall materials for construction. Regarding fFrK.

[Background technology]

Conventionally, plate-shaped bodies containing asbestos using hydraulic cement as a binder have been known. In the past, asbestos was included to reinforce the plate-shaped body and to improve papermaking performance when papermaking was made from slurry. However, since asbestos causes pollution, methods of manufacturing cement-based plate-shaped bodies that do not contain asbestos using a Hatchek papermaking machine have been considered for some time. In other words, as reinforcing fibers to replace asbestos, fibers such as wood pulp, vinylon, polyol-pyrene, and needle-shaped inorganic materials are used, and it is only by combining these that the physical properties are secured. is the current situation. Therefore, initially, the obtained products are not much different from conventional asbestos-containing products, but as they are used outdoors for a long period of time, dimensional shrinkage increases and cracks often occur in the peripheral areas. On the other hand, the above-mentioned cement-based plates that do not contain asbestos have no choice but to use the high-priced Et and fiber other than asbestos, so the amount used is reduced and the comparison is made so that high strength can be achieved. target, high specific gravity (
1.5 or more) and are often thin. Therefore, there was a drawback that the surface texture had to be inevitably simple.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a lightweight inorganic plate-like material that is lightweight, easy to form uneven patterns, and has excellent dimensional stability even after long-term use. [Disclosure of the Invention] The lightweight inorganic plate-like body of the present invention has a Canadian standard freeness of 10.
0 to 200 CC [C8F] containing 2 to 6% of beaten wood pulp by total solid weight percent, and an artificial lightweight hollow aggregate with an average particle size of 200 μ or less by total solid weight of 10 Contains ~40%, etc.
It contains hydraulic cement, reinforcing fibers, and filler, and by adopting such a structure, the above-mentioned object of the present invention can be achieved.0 Hereinafter, the present invention will be carried out. I will explain in more detail from sensing. The wood pulps used in the present invention are NUKPlNBKP and NUSP.

Wood pulp such as NBSP or TMP is milled to a Canadian standard freeness of 100 to 200 C0CC3.
It is a product that has been beaten to reach the range of F), and has a total solid content of 2 to 6% by weight. In other words, the wood pulp used in the present invention may be any pulp made of wood fibers, and there are no particular restrictions on the processing method used for pulping, but since the binder is hydraulic cement, it is preferable to use lysinine, Kraft treated valves with a relatively small amount of residual tricellulose are effective. On the other hand, linter pulp, cotton, hemp, etc. are also conceivable, but they are unsuitable in terms of price and a# strength after beating. In addition, in the present invention, recycled waste paper such as tampon, newspapers, magazines, etc. can also be used as long as the wood pulp used has little foreign matter. A single disc refiner is used as a means of beating wood pulp.
A tuple disc refiner, a stone refiner, etc. are preferable, but they are not limited in their use. The purpose of beating the wood pulp used in the present invention is to fibrillate the pulp fibers, thereby increasing the surface area of the fibers and increasing the ability to capture granular materials such as cement. This is to have the effect of suppressing the separation of hollow lightweight aggregates in the slurry. If the freeness is greater than 200 Co by Canadian standard freeness (
In other words, if it is insufficient), the ability of the pulp to coagulate cement, etc. will decrease, and the concentration of white water (cylinter vat wastewater) will increase during papermaking, resulting in a significant decrease in material yield. On the other hand, too much beating (+o Canadian standard freeness)
occ or less), the filtration resistance of the slurry is too large, which slows down the papermaking speed and reduces production efficiency. Therefore, in the present invention, wood pulp beaten to a Canadian standard freeness of 100 to 200 ρCCC3F is used.

Next, the hollow artificial lightweight aggregate π used in the present invention will be explained. Perlite is most commonly preferred as the artificial lightweight aggregate. In addition to perlite, it is also possible to use shirasu balloons, fly ash balloons, glass, beads, etc., but the average particle size is preferably 200 μm or less. Normally commercially available pearlite has a wide particle size distribution and is difficult to limit by average particle size, but if it is larger than 200μ, the expansion ratio is usually large and the particle specific gravity tends to be correspondingly small. It is easy to cause problems such as floating on the surface and breaking up. A more preferable particle having an average particle size of 50 to 100 microns is preferable as a particle that can be easily separated in a slurry and exhibits high strength in a cured product. On the other hand, it is also possible to use materials other than pearlite, such as shirasu balloons, fly ash balloons, or vitreous hollow spheres. The amount used is preferably 10 to 40%; if it is less than 10%, not only is the weight reduction insufficient, but also a garment with good dimensional stability cannot be obtained. On the other hand, if it exceeds 40%, the proportion of neglected aggregate is large and the surface of the cured product becomes brittle, which may cause problems in coating film adhesion.

Next, synthetic fibers used as compositions other than those mentioned above will be explained. Generally, in order to obtain the effects of the present invention, polyethylene, acrylic fibers, etc. are used in addition to polyvinyl alcohol (PVA) fibers. The fiber length and diameter should not be particularly limited as they vary depending on the purpose of the product, but in consideration of workability during paper making and cuttability of the green sheet, JW with 5 to 10 strands is most effective. I'm angry even if I get angry
For various reasons, the thickness is preferably about 10μ to 100μ. As mentioned above, in order to obtain the effects of the present invention, there are no particular limitations on the type of synthetic fibers used, but when emphasis is placed on product strength, polyvinyl alcohol fibers are most effective. In addition, when making paper using a paper making machine, it depends on the national insurance regarding the concentration.
When winding multiple layers using a machining roll, delamination may occur, and in this case, the most effective means to deal with this is to use silica powder, which is a by-product during the production of ferrosilicon. The combined use of silica and neem has the effect of reducing local peeling FJI of the clean sheet and improving the strength of the product after curing at the same time.The amount of silica powder used is not particularly limited, but usually all solids are used. It is preferred to use 5 to 15% by weight. K-10 P generated when it is more than 15%: if! It has the disadvantage that L resistance increases and production efficiency decreases, but if it is less than 5%, delamination of the green sheets that have been collected is likely to occur, but on the other hand, there is a noticeable effect of improving the strength of the product. However, if the material described above is prepared as described in claim 1, it can be made into paper using a Hatchek paper making machine, but the yield of the material can be improved. In order to produce more efficiently, such as improving production speed, as shown in item 4 of the Fi claim, papermaking is performed using a slurry that falls within the range of slurry 〇 filtration coefficient; K≦5 Cz'/2t. This is desirable. Here, the filtration coefficient is defined as follows. In other words, the filtration coefficient is the same mesh size as the wire mesh of the sheathed cylinder of the Hatchek papermaking machine that actually uses the slurry of the above concentration (usually 50 to 60).
0.5 to 1.0
1, immediately add F liquid volume; v (a + lit, filtration time; θ
[5] Measure until ■ reaches 100-, and calculate (dv / dθ) from the obtained filtration curve; v (θ), and set the vertical axis K (dθ/dv) of the graph and the horizontal axis An approximate straight line obtained by taking ``=2/K(v+α) [αv is a constant], the average value of the slope up to v〈50-;
) is the effective area of the wire mesh; S[tr! ]
Let the value divided by K be K. In order to make paper most efficiently, it is necessary to set the resistance value during filtration of slurry, the dehydration properties of Kakei immediately after filtration, the concentration of white water during filtration, etc. to conditions that are compatible with the papermaking material. It is usually desirable to add a polymer flocculant to the slurry. At this time, in order to carry out the above-mentioned efficient papermaking, the present inventors have found, as a result of intensive studies, that it is desirable to set the filtration coefficient to K≦5/see. The filtration coefficient is a factor that generally indicates the ease of filtering. For example, if the filtering property is too good and the level in the cylinder A cannot be secured, K should be set to a value larger than 5 cm/set. In this case, it is necessary to increase the slurry concentration or reduce the amount of polymer flocculant to reduce K.

A paper is made using the slurry as explained above, and the paper is rolled up with a machine roll until the desired thickness is reached.The paper is then dehydrated by a press, patterns are added on the front and back sides if necessary, and the paper is cured and hardened as necessary. In particular, the lightweight non-material plate-like body of the present invention can be obtained.

When the material-free plate-like body of the present invention is formed by the Hatchek papermaking method, the green sheet immediately after being wound up on a main roll contains lightweight aggregate, so a relatively bulky green sheet is obtained. By pressing, it is possible to obtain a product with a deep uneven pattern. In this case, a portion of the lightweight aggregate contained in the material is destroyed during pressurization, making it possible to create deep patterns. Even if it breaks, there is a large amount of reinforcing fibers around it, so high strength and dimensional stability can be obtained to suppress a decrease in strength. The materials used are shown below.

Wooden Palzu Made by NUKPC Nanshin Pulp ■ Vinylon R
KI 502 Immediately pressure molded in a pattern mold at 80℃,
Heat curing was carried out for 3 days. Each physical property of the cured product was measured using a cured sample that was air-dried indoors for 10 days. Among the physical properties, dimensional stability is measured at 105°C.
Based on the dimension after drying for 24 hours, the elongation rate (%) of the dimension after immersing it in water for 2 days is shown. In addition, nonflammability was tested using a method based on Ministry of Construction Notification No. 1828, and rejected products had a temperature rise of 50'C in the base material test.
This is based on the above.

Table 2 [Effects of the Invention] As described above, the present invention is made of M material, so it is lightweight and has high strength, has excellent dimensional stability, and has a richly designed inorganic board with a deep uneven pattern. I was able to obtain a good body.

Agent Patent Attorney Ishi 1) Chief Patent Attorney Sequel Amendment (Spontaneous) October 22, 1980 Lightweight inorganic plate-shaped body 3, relationship to the case of the person making the amendment Patent Office of applicant Oaza, Kadoma City, Osaka Prefecture 1048 Kadoma Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4 Agent name (6176) Patent attorney Ishi 1) Cho Shichij
Telephone Osaka (06) 345-7777 (Representative) 5. Date of amendment order

Claims (1)

[Claims] (1) Canadian standard freeness: 100 to 200 cc [CSF
] Contains 2 to 6% by weight of total solids of beaten wood pulp in the range of 10 to 40% by weight of total solids, and contains 10 to 40% of artificial lightweight hollow aggregate with an average particle size of 200μ or less, In addition, a lightweight inorganic plate containing hydraulic cement, reinforcing fibers, and filler. (2) The metrical inorganic plate-shaped body according to claim 1, wherein the artificial lightweight hollow aggregate is pearlite. (3) Claim 1 or 2, wherein the reinforcing fibers are polyvinyl alcohol fibers, and the filler is silica fume with an average particle size of 1 μm or less, which is a by-product during the production of ferrosilicon. 2. The lightweight inorganic plate-like body according to item 2. (4) By adjusting the pulp freeness, silica fume content, slurry concentration, polymer flocculant amount, etc., the slurry filtration coefficient during papermaking; K < 5 cm^4/sec.
2. The lightweight inorganic plate-like material according to claim 1, which is made by a Hacheck paper-making machine using a slurry falling within the range of . (6) The lightweight inorganic plate-like body according to claim 1, wherein the reinforcing fiber is asbestos of 5 wt% or less.