JPH0611662B2 - Fireproof plate material for nailing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a nail used as a plate material for construction and construction that requires nailing work such as a base plate for roofing material and a concrete discard formwork. The present invention relates to a refractory plate material for beating.

<Prior Art> A base plate of a roofing material is a plate material for construction having a role of nailing and fixing the roof. The concrete discard formwork is used when constructing concrete structures by nailing at the construction site.

Conventionally, a wooden board has been used as such a board, but in recent years, a board having fire resistance is often used.

For example, a cement board has high fire resistance, but since nailing work cannot be performed, as the board having fire resistance described above, an inorganic adhesive such as cement is kneaded with wood wool and wood chips to be molded. What has been used is being used.

However, in the above-mentioned plate material, wood wool in a dry state, wood chips absorb moisture during curling and curling, which causes a problem of generating voids in the formed plate material, and cracks in nailing work. It was liable to occur and had a low nail-holding property.

As a plate material proposed in order to solve the above-mentioned problems, there is a plate material described in JP-A-1-286942, which suppresses curling by pre-wetting wood wool and wood pieces. there were. Further, Japanese Examined Patent Publication No. 2-15505 describes that a piece of wood is used by preliminarily immersing it in water.

Further, the above-mentioned plate material impairs the appearance due to the fact that the wood piece is exposed on the surface and the inorganic adhesive is not sufficiently cast into the mold used for its molding.

As a plate material proposed to solve the above-mentioned problems, there is a plate material described in JP-A-2-106303, which is a cement paste poured into a mold and then sprayed with wood chips and high-pressure pressed. By curing, it was possible to eliminate the appearance defect such as exposing the wood chips.

<Problems to be Solved by the Invention> However, since the plate materials described in the above-mentioned respective publications reduce the porosity in each of them, it is difficult for the nail to be driven, and the nail retention property is deteriorated. It happened.

In addition, since such a plate material has a low porosity and a high content rate of the inorganic adhesive material, it becomes heavy and a burden on the supporting member is increased, and a burden and a problem are also caused in workability such as transportation and assembly. It happened.

<Means for Solving the Problems> The present invention has been proposed in view of the above, and is a scale-like wood chip and a calcium carbonate-ethylene vinyl acetate copolymer (hereinafter, referred to as EVA) foamed pulverized aggregate, Portland semé. The present invention relates to a fire-retardant plate material for nailing, which is formed by laminating a first layer composed of an additive and an additive material and a second layer composed of fibrous wood wool and Portland cement.

Each layer of the fire-resistant plate material for nailing of the present invention described above can be prepared by mixing the respective constituent materials, kneading with water and press-forming, and when used as a base plate for a roofing material. , The first layer is located on the upper side and the second layer is located on the lower side.

The scale-like wood chip used for the first layer described above does not need to be lubricated in advance as in the conventional example, and can be used in a dry state, and the first layer has nail-holding property and sound absorbing property. Can be given.

Also, the calcium carbonate-E used in the first layer of the present invention.
The VA foamed crushed aggregate is obtained by adding calcium carbonate and a foaming agent to a copolymer (EVA) resin of ethylene and vinyl acetate, foam-molded, and crushed this foamed body to be used as an aggregate. The resin itself is flexible, and since it is a foam, it is lightweight and elastic. Therefore,
It is possible to reduce the specific gravity of the first layer, impart stable nail-holding properties, facilitate nailing, and make it difficult to remove nails that have been nailed.

Similar to the calcium carbonate-EVA foamed crushed aggregate described above, the Portland cement used in the first layer is
It is intended to impart fire resistance and strength to the layer, and the additive material is added for the purpose of improving various physical properties of the plate material, or improving the kneading property during production, for example, an inorganic filler, An organic filler, a thickener, a defoaming agent, etc. can be mentioned.

Therefore, the first layer of the present invention has an extremely large nail-holding property as compared with the conventional fire-resistant plate material, is lightweight, and also has sound absorbing properties, fire resistance, and high strength.

Next, the fibrous wood wool used in the second layer of the present invention imparts nail-holding property and sound absorbing property to the plate material in the same manner as the wood chip in the above-mentioned first layer, but is more granular than the wood chip. Since the diameter is small, the nail retaining property is smaller than that of the first layer using the wood chips, but the sound absorbing property is increased.

Therefore, the second layer of the present invention has particularly excellent sound absorbing properties, and also has heat insulating properties, fire resistance, and high strength.

In addition, the second layer of the present invention described above includes fibrous wood wool and Portland cement, and if necessary calcium carbonate-
EVA foamed crushed aggregate and additives may be added, and in this case, the nail-holding property of the second layer as well as the first layer can be improved.

The fire-resistant plate material of the present invention is a laminate of such a first layer and a second layer. When used as a base plate for a roofing material, the first layer in contact with the roofing material is nailed to the roofing material. The material can be fixed, and the ceiling side and the second layer in the room can reduce the reverberation in the room.

Further, since the fireproof plate material of the present invention is lightweight, the load on the supporting member is small, and the workability of transportation, assembly and the like is improved.

In order to produce such a fire-resistant plate material of the present invention, first, water is added to a mixture of the constituent materials of the first layer, sufficiently kneaded, filled in a mold and lightly pressed, and then After adding water to a mixture of the constituent materials of the second layer and thoroughly kneading the mixture, it may be cast on the first layer and lightly pressed, and high pressure pressing is not required.

The fire-resistant plate material of the present invention produced as described above has a nail holding force of usually 30 kgf / piece or more (colonial needle),
Bending strength and compressive strength are 40 kgf / cm ² or more and 60 kg, respectively.
f / cm ² or more. The thermal conductivity is 0.2-0.3 kcal
/ Mh ° C, and the air-dry specific gravity is 0.8 to 0.9.

<Examples> Examples of the present invention will be described below.

Examples 1 to 3 The constituent materials for the first layer having the formulations shown in Table 1 (each numerical value indicates the number of parts) are placed in a stirrer and dispersed and mixed for 5 minutes. Then, this is put into a kneading machine, and 400 parts of water is gradually added to sufficiently knead, and the kneading material 1 for the first layer is formed into a form A composed of timber a and plywood b as shown in FIG. Put it inside and press lightly to obtain a uniform thickness, making it about 20 mm thick.

Next, the constituent materials for the second layer having the composition shown in Table 1 are put into a stirrer and dispersed and mixed for 5 minutes. Put this in the kneader,
260 parts of water is gradually added and sufficiently kneaded, and the kneading material 2 for the second layer is put on the first layer 1 filled in the form A of FIG. 1 to obtain a uniform thickness. Press lightly, thickness 5
Try to be ~ 7mm.

Further, as shown in FIG. 2, the next form A is placed and the first
A layer 1 and a second layer 2 are prepared, lightly pressed and cured for about 24 hours.

Then, the mold A was removed, and after curing in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65%, it was cut into a predetermined size.

As a result, it is possible to obtain a fireproof plate material which is lightweight and has no voids in the first layer and innumerable relatively large voids for sound absorption in the second layer. For example, it is used as a base plate for the roofing material shown in FIG. can do.

Comparative Examples 1-2 With the composition shown in the first vote, plate materials were produced by the same work procedure as in the above-mentioned Implementation Orders 1 to 3.

[Contents of chemicals used in Table 1] Wood chips… scaly calcium carbonate-EVA foamed aggregate of approximately 30 mm: Grain size 1 mm product… Bulk specific gravity 0.137 Particle size 0.8 mm product… Bulk specific gravity 0.171 Metroz SM-4000… Thickener (Shin-Etsu Chemical Co., Ltd.) Mighty-100 ... Dispersing water reducing agent (Kao Co., Ltd.) Go-Cenol 172SS ... Adhesive (Nippon Synthetic Chemical Industry Co., Ltd.) SN Diffoma-14HP Defoamer (manufactured by San Nopco Ltd.) Mika powder M-80 ... Aggregate (manufactured by Union Kasei Co., Ltd.) Wood wool fiber… Approximately 50 mm long [Performance test] Nail retention test Width 60 mm x Length 100 mm × Cut to a thickness of 25 mm, temperature 20
A 31 mm long colonial nail was driven up to 24 mm in the center of the first layer side of the specimen that had been aged for 3 weeks in a constant temperature and humidity chamber at a temperature of 65 ° C and a humidity of 65%, and a nail retention test was conducted at n = 3. The results are shown in Table 1.

Tester: Autograph AG-5000C manufactured by Shimadzu Corporation Test conditions: Full scale; 100kgf load speed; 2mm / min Chart speed; 20mm / min Specimen: [3W];

[3W-5W]; After nailing, the specimen was cured for 5 weeks and tested.

Air-dry specific gravity Cut to width 60 mm × length 100 mm × thickness 25 mm, temperature 20 ℃,
The weight of the [4W] test sample aged in a thermo-hygrostat at a humidity of 65% for 4 weeks was measured at n = 3 to determine the air-dry specific gravity. The results are shown in Table 1.

Air-dry specific gravity = W / V W: Specimen weight [g] V: Specimen volume during weight measurement [cm ³ ] Bending strength test Cut to width 60 mm x length 100 mm x thickness 25 mm at a temperature of 20 ° C ,
[4W] specimens cured for 4 weeks in a constant temperature and humidity room with a humidity of 65%,
[8W] specimens that had been aged for 8 weeks were subjected to a compression test at n = 3. The results are shown in Table 1.

Testing machine: Shimadzu Autograph AG-5000C Test conditions: Full scale; 500kgf, Load speed; 0.5mm / min Chart speed; 20mm / min Span; 6cm W: Load [kgf] b; Cross-section width [cm] h; Cross-section height [cm] l; Distance between fulcrums [cm] Compressive strength test Using the specimen used for bending strength test, n = 3 The compressive strength was measured. The results are shown in Table 1.

Tester: Shimadzu Autograph AG-5000C test conditions: full scale; 2,500 kgf load speed; 2 mm / min Chart speed; 20 mm / min compressive strength ^{[kgf / cm 2] = W} / 16 W; load fire test JIS A 1321 [ Surface test according to the flame retardancy test method of building interior materials and construction method (n = 3), temperature time area (℃, min) exceeding standard temperature curve from exhaust temperature curve and smoke emission coefficient curve, and The smoke emission coefficient (CA) per unit area was determined.

The results are shown in Table 1.

Specimen for surface test: 22cm × 22cm × thickness 2.5cm, material age 4W thermal conductivity measurement test JIS A 1413 [thermal conductivity measurement method (flat plate direct method)], n = 3 test went. The results are shown in Table 1.

Specimen size: 30cm × 30cm × 2.5cm <Effects of the Invention> As described above, the fire-resistant plate material of the present invention is a fire-resistant plate material having high strength, and in particular, the nailing operation to the first layer can be easily performed, and the high nail-holding force The roofing material can be firmly fixed. Further, since it can be firmly fixed in a frame shape by hitting nails, it can be effectively used as a discard formwork for a concrete structure.

When the fireproof plate material of the present invention is used as a base plate for a roofing material, the second layer also functions as a sound absorbing material on the indoor side.

Moreover, the fire-resistant plate material of the present invention can be manufactured by simple steps of mixing, kneading, casting, pressing, curing, etc.
Unlike the conventional case, a high-pressure press is not required, and since the manufactured fireproof plate material is lightweight, it has a very low burden in operations such as transportation and assembly and is highly practical.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a sectional view showing a step of filling the fireproof plate material of the present invention, FIG. 2 is a sectional view showing a pressing step, and FIG. 3 is a roof base material. It is sectional drawing which shows an example of a usage state.

Claims (2)

[Claims] 1. Scale-like wood chips and calcium carbonate
Fire resistance for nailing by laminating a first layer composed of ethylene-vinyl acetate copolymer foamed aggregate, Portland cement, and an additive material, and a second layer composed of fibrous wood wool and Portland cement Plate material. 2. Scale-like wood chips and calcium carbonate
First layer composed of ethylene vinyl acetate copolymer foamed crushed aggregate, Portland cement, and additive, and fibrous wood wool and calcium carbonate-ethylene vinyl acetate copolymer foamed crushed aggregate, Portland cement, additive A fireproof plate material for nailing, which is formed by laminating a second layer composed of