JPH086416B2 - Fireproof plate material for nailing and method for manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nail used as a board for construction and construction that requires nailing work, such as a roofing base plate, concrete discard formwork, outer wall base material, and slicing material. TECHNICAL FIELD The present invention relates to a refractory plate material for beating and a manufacturing method thereof.

[0002]

2. Description of the Related 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 a concrete structure 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, 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 wool and wood chips. A molded product is used. However, in the above-mentioned plate material, wood wool in an air-dry state,
The wood pieces absorb moisture and curl during kneading and curing, which causes a problem that voids are generated in the molded plate material, which easily causes cracks during nailing work and has low nail retention. 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 preliminarily moistening wood wool and wood chips. there were. Further, Japanese Examined Patent Publication No. 2-15505 describes that a piece of wood is preliminarily immersed in water for use. In addition, the above-mentioned plate material impairs the appearance due to the fact that wood chips are exposed on the surface and the inorganic adhesive is not sufficiently cast in every corner of the mold used for its molding. As a plate material proposed to solve the above-mentioned problems, Japanese Patent Laid-Open No.
There is a plate material described in Japanese Patent No. 106303, in which a cement paste is poured into a mold, and then wood chips are sprayed, high-pressure pressed, and cured to eliminate appearance defects such as exposure of the wood chips.

[0003]

However, since the plate materials described in the above-mentioned respective publications have low porosity, they have a problem that nails are hard to drive and nail retention is low. Further, since such a plate material has a high content of the inorganic adhesive material, it becomes heavy and increases the load on the supporting member, which causes a burden and a problem in workability such as transportation and assembly. It was

[0004]

The present invention has been proposed in view of the above, and is a calcium carbonate-ethylene vinyl acetate copolymer (hereinafter referred to as EVA) foamed crushed aggregate, cements, and an additive. In the fire-resistant plate material, the ratio of fine particles of calcium carbonate-EVA crushed aggregate foam and cements increases toward the lower layer side of the fire-resistant plate material, and the porosity decreases, for nailing. It relates to a fireproof plate material. The present invention also provides calcium carbonate-E as a method for manufacturing the fire-resistant plate material for nailing.
VA foamed crushed aggregate, cements, additives, and water are kneaded, and the kneaded material is supplied into a mold and pressed or vibrated, and then cured and cured. It also proposes a method for manufacturing a fireproof plate material for nailing.

The above-mentioned calcium carbonate-EVA foamed crushed aggregate used in the present invention is foam-molded by adding calcium carbonate and a foaming agent to a copolymer (EVA) resin of ethylene and vinyl acetate, and this foaming. The body is crushed and used as an aggregate, and since the resin itself is flexible and is a foam, it is lightweight and has elasticity. Therefore, by blending this aggregate, it is possible to reduce the specific gravity of the fire-resistant plate material to be manufactured, to impart stable nail-holding properties, to facilitate nailing, and to make it difficult to remove the nail that has been struck.

The cements used in the present invention are
It imparts fire resistance and strength to a plate material, for example,
Portland cement, Portland mixed cement,
Magnesia cement, slag cement, white cement,
Examples thereof include gypsum, and the additive is added for the purpose of improving various physical properties of the plate material or improving kneading property during production. For example, an inorganic filler, an organic filler, a thickener. , Defoaming agents and the like.

Further, the fireproof plate material of the present invention may contain scale-like wood chips and / or fibrous wood wool,
The scale-like wood chip need not be preliminarily wetted as in the above-mentioned conventional example, and can be used in the air-dried state, and nail retention and sound absorption can be imparted.
Also, fibrous wood wool imparts nail retention and sound absorption to the fire-resistant plate material like the wood chips, but since it has a smaller particle size than the wood chips, it retains more wood than the wood chips. Nailability is reduced and sound absorption is increased.

In order to produce the fire-resistant plate material of the present invention from the above-mentioned constituent materials, first, the constituent materials are mixed, and then water is added and sufficiently kneaded. Next, after supplying this kneading material into the mold, the mold is mechanically vibrated by a vibrator with a maximum vibration force of about 300 kg for 30 to 60 seconds. Then, in the kneaded material in which the respective constituent materials are uniformly dispersed, the constituent material having a high specific gravity is settled and the constituent material having a low specific gravity is floated upward. That is, on the lower layer side of the kneaded material, the proportion of fine particles of the calcium carbonate-EVA foamed crushed aggregate and cements becomes high, and on the upper layer side, the calcium carbonate-EVA foamed crushed aggregate, wood chips, and fibrous wood. Higher percentage of hair. When the kneaded material is pressed in this state and cured to be hardened, it is possible to produce a fireproof plate material in which the proportion of fine particles of the calcium carbonate-EVA crushed aggregate and cements increases toward the lower layer side. .

As described above, the fire-resistant plate material of the present invention has different characteristics on the front and back sides because the proportions of the constituent materials on the upper layer side and the lower layer side are different, and the lower layer side is extremely different from the conventional fire-resistant plate material. While it has a large nail-holding property, high strength and excellent fire resistance, the upper layer side is particularly excellent in heat insulation and sound absorption. Therefore, the fire-resistant plate material of the present invention is used as a base plate for a roofing material, and calcium carbonate-E is used.
When the lower layer side having a high proportion of fine particles of VA foamed crushed aggregate and cements is exposed to the roofing material, the roofing material can be firmly and surely fixed by a simple nailing operation. Further, since the upper layer side of the fire-resistant plate material of the present invention is the ceiling side in the room, it is possible to improve the heat insulation effect in the room and to impart the sound absorbing effect. Further, since the fire-resistant plate material of the present invention is lightweight, the load on the supporting member is small, and the workability of transportation and assembly is improved.

Further, according to the manufacturing method of the present invention, it is possible to manufacture fireproof plate materials having different front and back characteristics by casting once, so that fireproof plate materials having different structures are separately prepared and then laminated and laminated.
Economical required for manufacturing work, compared to the integrated method,
The time cost can be significantly reduced. The above-mentioned fire-resistant plate material of the present invention has a nail-holding force of usually 30 kgf.
/ Or more (colonial needle), flexural strength and compressive strength of 30 kgf / cm ² or more and 80 kgf / c, respectively
m ² or more. In addition, its thermal conductivity is approximately 0.2 to
It is in the range of 0.3 kcal / mh ° C, and the air-dry specific gravity is
It is 0.8 to 0.95.

[0011]

EXAMPLES Examples 1 to 3 The constituent materials 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 390 parts of water is gradually added to sufficiently knead the kneading material 1 to form a mold A having an open upper surface composed of a side frame a and a bottom plate b as shown in FIG. Put it in. Next, this form A is set to Eurus Vibrator KE.
E3-B (maximum vibration force 300kg, output 0.13KW;
K. K. (Murakami Seiki Co., Ltd.) is placed on a table and shaken for 30 to 60 seconds. Due to the above-described vibration, the component having a low specific gravity in the kneading material 1, the calcium carbonate-EVA foamed crushed aggregate 2, the wood chip 3, and the fibrous wood wool 4 float to the upper layer side 5. In addition, the proportion of fine particles and cements of the calcium carbonate-EVA foamed aggregate is increased toward the lower layer side 6, and the porosity is decreased. After that, press lightly as shown in Fig. 2 to obtain a thickness of about 25 mm.
After curing for about 24 hours, the mold 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 having a large number of relatively large sound-absorbing voids on the lower layer side 6 and no sound on the upper layer side 5, and for example, it can be used as a base plate for a roofing material shown in FIG. it can. Comparative Examples 1-2 Table 1
A plate material was prepared with the composition shown in Table 1 by the same work procedure as in Examples 1 to 3 above (however, the plate material was allowed to stand instead of being vibrated).

[Contents of chemicals used in Table 1] Wood chips: scaly wood hair fibers of about 30 mm ... Cut to about 20 to 30 mm Calcium carbonate-EVA foamed crushed aggregate: 1 mm particle size ... Bulk specific gravity of 0 137 Grain size 0.8 mm product ... Bulk specific gravity 0.171 Metrose SM-4000 ... Thickener (Shin-Etsu Chemical KK
Metrose 90SH-15000 ... Thickener (manufactured by Shin-Etsu Chemical KK) Mighty 100 ... Dispersing water reducing agent (manufactured by Kao KK) Gohsenol 172SS ... Adhesive (manufactured by Nippon Synthetic Chemical Industry KK) SN Deformer 14HP ... Defoaming agent (San Nopco K.
K. Made)

[Performance test] Nail retention test A width of 60 mm × length of 100 mm × thickness of 25 mm was cut and aged at a temperature of 20 ° C. and a humidity of 65% in a constant temperature and humidity chamber for 3 weeks. A colonial nail having a length of 31 mm was driven in up to 24 mm, and a nail holding force test was performed at n = 3. The results are shown in Table 1. Test machine: Autograph AG-5000C manufactured by Shimadzu Corporation Test conditions: Full scale; 100 kgf Load speed; 2 mm / min Chart speed; 20 mm / min Specimen: [3W]; Immediately after nailing, the test was performed. [3W-8W]; After driving the nail, it was further cured for 8 weeks and tested. Air-dry specific gravity A width of 60 mm, a length of 100 mm, and a thickness of 25 mm was cut, and the weight of a [4W] sample that had been aged for 4 weeks in a constant temperature and humidity chamber at a temperature of 20 ° C. and a humidity of 65% was measured at n = 3. The dry specific gravity was calculated. 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, temperature 20 ° C The [4W] specimens aged for 4 weeks and the [8W] specimens aged for 8 weeks in a thermo-hygrostat having a humidity of 65% were subjected to a compression test at n = 3, respectively. The results are shown in Table 1. Testing machine: Autograph AG-5000C manufactured by Shimadzu Corporation Test conditions: Full scale; 500 kgf, load speed; 0.5 mm / min Chart speed; 20 mm / min span; 6 cm Bending strength [kgf / cm ² ] = (3 x W x L) / 2 × b
× h ² W; load [kgf] b; width of cross section [cm] h; height of cross section [cm] L; distance between fulcrums [cm] compressive strength test Using the specimen used for the bending strength test, n = 3, the compressive strength was measured. The results are shown in Table 1. Testing machine: Autograph AG-5000C manufactured by Shimadzu Corporation Test conditions: Full scale; 2500 kgf, load speed; 2 mm / min Chart speed; 20 mm / min Compressive strength [kgf / cm ² ] = W / 16 W; Load Fire protection test JIS A 1321 [flame-proof test method of interior materials for construction and construction method] was performed on the surface of the specimen (n = 3), and the temperature-time area (exceeding the standard temperature curve from the exhaust temperature curve and smoke coefficient curve) (° C, min) and smoke emission coefficient (CA) per unit area were determined. The results are shown in Table 1. Surface test specimen: 22 cm × 22 cm × thickness 2.5 cm, material age 4W thermal conductivity measurement test Tested at n = 3 according to JIS A 1413 [thermal conductivity measurement method of heat insulating material (flat plate direct method)] I went. The results are shown in Table 1. Specimen size: 30 cm x 30 cm x 2.5 cm

[0014]

[Table 1]

[0015]

As described above, the fire-resistant plate material of the present invention is a light-weight fire-resistant plate material having high strength, and in particular, the nailing work can be easily performed on the lower layer side, and the high nail-holding force is used. The roofing material can be firmly fixed. Further, when the fireproof plate material of the present invention is used as a base plate for a roofing material, the upper layer side also functions as a heat insulating material and a sound absorbing material in the room. further,
The fire-resistant plate material of the present invention can be manufactured by simple steps such as mixing, kneading, casting, vibration, pressing, curing, etc., and does not require a high-pressure press as in the conventional case, and is manufactured. Since the fire-resistant plate material is lightweight, it has a very low burden in operations such as transportation and assembly, and is extremely practical.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state during a filling step during a manufacturing process of a fire-resistant plate material according to the present invention.

FIG. 2 is a cross-sectional view showing a state during a pressing step during the manufacturing process of the fireproof plate material of the present invention.

FIG. 3 is a cross-sectional view showing an example of a usage state of the fire-resistant plate material of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C04B 14:28)

Claims (4)

[Claims] 1. A refractory plate material comprising a calcium carbonate-ethylene vinyl acetate copolymer foamed crushed aggregate, cements, and an additive, wherein fine particles of the calcium carbonate-ethylene vinyl acetate copolymer foamed crushed aggregate and A refractory plate material for nailing, characterized in that the proportion of cement increases as it goes to the lower layer side of the refractory plate material, and the porosity decreases. 2. The fire-resistant plate material for nailing according to claim 1, wherein the fire-resistant plate material contains scaly wood chips and / or fibrous wood wool. 3. A calcium carbonate-ethylene vinyl acetate copolymer foamed crushed aggregate, cement, an additive, and water are kneaded, and this kneaded material is supplied into a mold to be pressed or vibrated. A method for manufacturing a fire-resistant plate material for nailing, which comprises curing and hardening after curing. 4. The method for producing a fireproof plate material for nailing according to claim 3, wherein the kneading material contains scale-like wood chip and / or fibrous wood wool.