JP3349269B2 - Plaster composition for inorganic boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a stucco composition for an inorganic board and a stucco board using the same.

[0002]

2. Description of the Related Art Conventionally, in a humid Japanese house,
Wood is used as a material having a humidity control function, which has a function of adjusting humidity in a room and a function of preventing dew condensation. However, wood has a problem that it lacks dimensional stability and fire resistance as a material. In recent years, the use of wood as an interior material in reinforced concrete buildings and the like is restricted by the Building Standards Law. Further, the function of adjusting the humidity of wood cannot be sufficiently exhibited for a long period of time.

[0003] Plaster is an ancient Japanese traditional building material found in private houses, warehouses, and the like, and has a calm beauty that naturally melts. However, plaster has a lower humidity control function than wood, and the use of plaster as an interior material cannot prevent dew formation.

[0004]

The problem to be solved by the present invention is to improve the hygroscopicity and moisture release of a stucco composition used for an inorganic board while maintaining the texture unique to the stucco. .

[0005]

The stucco composition for an inorganic board of the present invention comprises 100 parts by weight of stucco, and synthetic zeolite A.
The mixture is obtained by mixing 5 to 30 parts by weight of a mold and 50 to 120 parts by weight of water to form a plaster slurry, and then performing a drying treatment. It is preferable that the stucco slurry further contains 5 to 20 parts by weight of a kneading agent based on 100 parts by weight of the stucco.

Preferably, the synthetic zeolite is a synthetic zeolite A type. It is preferable that the kneading agent contains an aqueous acrylic resin. Further, a stucco board of the present invention includes an inorganic base material, and the above-described stucco composition for an inorganic board laminated on the base material. ******** The present invention is described in detail below.

[0007] The stucco used in the present invention is not particularly limited as long as it contains slaked lime. The stucco may appropriately contain an inorganic material, susa, and a stucco paste in addition to slaked lime. Examples of the inorganic material include calcium carbonate, barium carbonate, and barium hydroxide. The inorganic material is preferably calcium carbonate because it is mixed with slaked lime to increase the strength. The amount of the inorganic material is 100 slaked lime.
The range of 5 to 30 parts by weight relative to parts by weight is preferable.

[0008] Susa has the function of preventing cracks when the plaster composition is used for wall materials and the like.
Examples include Japanese paper, asparagus, wood pulp, synthetic fibers and glass fibers. It is preferable that the fiber is thin and has high strength without impairing the texture of the stucco. From such a viewpoint, Japanese paper is preferable as the suede. The blending amount of the sweet is preferably in the range of 0.5 to 2 parts by weight based on 100 parts by weight of slaked lime.

The glue for the plaster may be any of natural glue and synthetic glue which have been used since ancient times, and may be used by appropriately mixing them. Examples of the plaster paste include natural pastes such as glue, glutinous rice, konjac powder, and laver; and synthetic pastes such as polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose. The amount of the stucco paste is preferably in the range of 0.5 to 1.5 parts by weight based on 100 parts by weight of slaked lime.

[0010] The synthetic zeolite used in the present invention is not particularly limited as long as it is an artificially synthesized zeolite.
Specific examples of commercial products of the synthetic zeolite used in the present invention include, for example, “Silton B”, “Silton C”
P "," Silton CPT "," Mizuka Sieves "(above, manufactured by Mizusawa Chemical Industry Co., Ltd.) and" Industrial Zeolite SP # 2300 "(manufactured by Nitto Powder Chemical Co., Ltd.). As the synthetic zeolite, at least one selected from the group consisting of A type, X type, Y type, and T type may be used. To further improve hygroscopicity and moisture release,
As the synthetic zeolite, A-type synthetic zeolite is preferable, and A-type synthetic zeolite produced from acidic clay (montmorillonite) is preferable.

The amount of synthetic zeolite in the plaster slurry used as a raw material of the plaster composition for an inorganic board of the present invention is as follows:
It is 5 to 30 parts by weight based on 100 parts by weight of the plaster. If the compounding amount of the synthetic zeolite is less than 5 parts by weight, the improvement in the hygroscopicity and the hygroscopicity is insufficient. On the other hand, if it exceeds 30 parts by weight, the texture becomes porous and light, and the heavy texture unique to plaster is lost.

[0012] The plaster slurry contains water. The mixing amount of water is 50 to 120 parts by weight based on 100 parts by weight of the plaster. When the amount of water is less than 50 parts by weight, the plaster slurry becomes hard and difficult to handle, and it becomes difficult to finish the plaster composition for an inorganic board smoothly, causing coarse bubbles in the plaster composition for an inorganic board. Becomes On the other hand, when the amount exceeds 120 parts by weight, the shrinkage ratio when the stucco slurry is dried is large, cracks are generated on the surface of the stucco composition for an inorganic board, and the surface becomes weak.

The stucco slurry may optionally contain a kneading agent, a pigment, a water reducing agent, an antifoaming agent and the like. The kneading agent contains a resin and water. Examples of the resin contained in the kneading agent include an aqueous acrylic resin, an aqueous vinyl acetate resin, an aqueous epoxy resin, and an aqueous urethane resin. The mixing ratio of the resin and water in the kneading agent is 50 to 70% by weight of water with respect to 30 to 50% by weight of the resin. If necessary, the kneading agent may contain components other than the resin and water.

When the stucco slurry further contains 5 to 20 parts by weight of a kneading agent with respect to 100 parts by weight of the stucco, when the stucco composition for an inorganic board of the present invention is laminated on the inorganic material, the inorganic material and the stucco composition are used. The adhesion strength with the object can be improved, and the impact strength of the plaster finish layer increases. When the resin contained in the kneading agent is a water-based acrylic resin, the adhesion strength between the inorganic material and the stucco composition can be further improved, and the impact strength of the stucco finish layer can be further increased.

Examples of the pigment include iron oxide, cyanine green, titanium oxide, and carbon. The amount of the pigment is preferably 0 to 3 parts by weight based on 100 parts by weight of the plaster. As the water reducing agent, for example,
Examples include powders containing phenol-based powder, naphthalene-based powder, and lignin-based powder. The amount of the water reducing agent is plaster 10
It is preferably 0.3 to 1.0 part by weight based on 0 part by weight.

As the defoaming agent, for example, Nopco 80
34, Nopco NXZ, Formaster PC, SN Deformer 113, and Dehydran C. The compounding amount of the antifoaming agent is preferably 0.1 to 1.0 part by weight based on 100 parts by weight of the plaster. In the method for producing the plaster composition for an inorganic board of the present invention, first, a plaster slurry is produced. The stucco slurry can be produced by mixing the above-described components constituting the stucco composition for an inorganic board with stirring in any order. In particular, it is preferable to disperse the kneading agent in water, add stucco, and mix with sufficient stirring, so that the viscosity is low and the leveling property is excellent. Next, the stucco slurry is dried to produce a stucco composition for an inorganic board. The conditions for drying the stucco slurry are not particularly limited, but the drying temperature is 120 to 180 ° C.
And it is preferable to hold for 1 to 2 hours.

The stucco board of the present invention comprises an inorganic base material and the above-mentioned stucco composition for an inorganic board laminated on the base material. An example of the plaster board of the present invention is shown in FIGS. 1 and 2, the plaster board 1 includes an inorganic base material 2 and a stucco composition 3 for an inorganic board laminated on the base material. In FIG.
The surface of the stucco composition 3 for inorganic boards is polished,
It has a glossy flat finish. In FIG. 2, the surface of the stucco composition 3 for an inorganic board has a mold and a brick pattern.

The inorganic base material is not particularly limited as long as it is an inorganic material, and examples thereof include concrete, brick, mortar, earth wall, calcium silicate plate, slate plate and gypsum board. Regarding the shape of the inorganic base material, one having an arbitrary thickness and size is used. The method for laminating the stucco composition for an inorganic board of the present invention is not particularly limited, and can be performed by a usual lamination method such as transfer, spraying, and pouring. In addition, it is preferable that the base material is preliminarily primed with a sealer before laminating the stucco composition on the base material, because the adhesion strength between the base material and the stucco composition is improved. It is more preferable to perform compression molding after lamination to increase the adhesion strength between the stucco composition and the base material.

The surface of the stucco composition for an inorganic board is shown in FIG.
As shown in FIG. 2, the surface may be polished and polished to give a glossy flat finish, or, as shown in FIG. 2, an arbitrary pattern may be formed in a mold before the surface is dried. . The obtained stucco board has a high hygroscopicity and a high moisture release property while retaining the texture unique to the stucco because the stucco composition for an inorganic board is laminated. The stucco board obtained in this way can be used as an interior material because it has improved hygroscopicity and moisture release while maintaining the texture unique to the stucco, and prevents the occurrence of indoor dew condensation. Can be.

[0020]

The following examples are illustrative of the present invention and do not limit the scope of the claims of the present invention. In the examples, “%” means “% by weight”. The evaluation methods in Examples and Comparative Examples are as follows. Evaluation method (workability test) A cylindrical flow cone having a diameter of 90 mm specified in JIS-A-1109 was placed on a glass plate. A slurry obtained by kneading the components of the composition for 10 minutes was poured from above the flow cone, the flow cone was immediately pulled out, and the slurry was spread on a glass plate. When the movement of the slurry stopped, the diameter of the slurry spread in a circular shape was measured.

○: Spread of the slurry is 150 to 200 mm Δ: Spread of the slurry is 90 to 150 mm ×: Spread of the slurry is 90 mm or less (Hygroscopicity / humidity release test)
(25 ° C., 40% RH) and allowed to stand until constant weight (about 7 days). The time when the weight reached a constant weight was defined as the initial weight. Then, the test specimen was placed in a thermo-hygrostat B (25 ° C., 80% RH), and subjected to 1, 2, 3, 4, 6, 9, 24, 48 and 72 hours. The subsequent change in weight with time was measured, and the moisture absorption was determined by the following formula. Further, the container was allowed to stand until the constant temperature and humidity chamber B reached a constant weight (about 7 days). The time when the weight became constant was newly defined as the initial weight, and then the test specimen was placed in a thermo-hygrostat A (25 ° C., 40% RH), and 1, 2, 3, 4, 6, 9, 24, 48 and The change with time of the weight after 72 hours was measured, and the amount of released moisture was determined by the following equation.

[0022] ：: 380 to 500 g / m ² △: 250 to 380 g / m ² ×: 250 g / m ² or less (Drop impact test) Test specimen solidified on a sand box (400 ×
400 mm). A steel ball having a weight of 1 kg was dropped from 0.5 m directly above the center of the test body.

：: No abnormality. Δ: Two or less cracks having a width of 0.1 to 10 mm were generated. ×: Cracks occurred in the entire test piece. (Dry hair crack test) Gypsum board (200m
(m × 200 mm × 9 mm), a wooden frame was attached, the plaster composition was poured to a thickness of 10 mm, and the surface was rubbed 3 to 4 times. Put it in a dryer at 120 ° C for 2 hours,
The occurrence of hair cracks was observed.

○: No abnormality. Δ: One or less hair cracks having a width of 0.05 to 5 mm were generated. ×: Hair cracks occurred on the entire test piece. (Examples 1-3 and Comparative Examples 1-2) For Examples 1-3 and Comparative Examples 1-2, the components shown in Table 1 were prepared (the numerical values indicate parts by weight). The components of the plaster used were 69% slaked lime, 29% calcium carbonate, 0.8% glue and 1.2% Japanese paper. After mixing the kneading agent in water and stirring well, stucco, synthetic zeolite, pigment and water reducing agent were added and stirred with a hand mixer to obtain a stucco slurry. A workability test was performed on the obtained slurry. Rubber-based molded sheet (length 200mm x width 200mm x thickness 10m
m) was set in a mold, and the slurry was poured into the surface of the rubber-based molded sheet and spread uniformly. Gypsum board (vertical 21
After applying a water-based sealer (0 mm × 210 mm × 9 mm in thickness), the slurry was laminated on a gypsum board. A pressure of ²⁰ to 30 kg / cm ² was applied to the obtained laminate, compression-molded for 2 to 3 minutes, and placed in a dryer at 120 ° C. for 2 hours to obtain a plaster board. A hair crack test was performed during drying. The obtained plaster board was subjected to a moisture absorption / desorption property test and a drop impact test.

[0025]

[Table 1]

Example 4 and Comparative Examples 3 to 7
Used synthetic zeolite type X in place of synthetic zeolite type A in Example 2. In Comparative Examples 3 to 5, natural zeolite, synthetic sepiolite A and synthetic sepiolite B were used in Example 2 instead of synthetic zeolite A type, respectively. In Comparative Example 6, only gypsum board was used.
Prepared only a cedar board and did not laminate the stucco composition. For each, the workability, the amount of moisture absorption / desorption (after 3, 25 and 160 hours) and the hair cracking property during drying were measured.

The stucco board laminated with the stucco composition containing the synthetic zeolite A type has about three times better moisture absorbing and releasing performance than the cedar board after 25 hours. However, such effects were small with natural zeolites and sepiolite.

[0028]

[Table 2]

[0029]

The stucco composition for an inorganic board of the present invention comprises:
100 parts by weight of plaster, 5 to 30 parts by weight of synthetic zeolite, and 50 to 120 parts by weight of water to form a plaster slurry, which is obtained by drying treatment. Properties and moisture release properties can be improved.

The stucco composition for an inorganic board may be the stucco 1
When the kneading agent is further contained in an amount of 5 to 20 parts by weight with respect to 00 parts by weight, the adhesion strength between the inorganic material and the stucco composition when laminated on the inorganic material can be improved, and the impact strength of the stucco finishing layer increases. . When the synthetic zeolite is a synthetic zeolite A type, the hygroscopicity and the moisture release can be further improved.

When the kneading agent contains an aqueous acrylic resin, the compatibility between the inorganic material and the stucco composition is improved,
The adhesion strength can be further improved, and the impact strength of the plaster finish layer can be further increased. The stucco board of the present invention,
Hygroscopicity and moisture release are improved while maintaining the texture unique to stucco. When used as an interior material, the occurrence of dew condensation can be prevented.

[Brief description of the drawings]

FIG. 1 is a view showing an example of a plaster board of the present invention.

FIG. 2 is a view showing another example of the plaster board of the present invention.

[Explanation of symbols]

 Reference Signs List 1 stucco board 2 inorganic base material 3 stucco composition for inorganic board

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideki Tamura 6-32-1, Machiya, Arakawa-ku, Tokyo Inside Asia Asia Co., Ltd. (56) References JP-A-5-254910 (JP, A) ( 58) Fields surveyed (Int. Cl. ⁷ , DB name) C04B 2/00-32/02 C04B 40/00-40/06

Claims (4)

(57) [Claims] 1. A plaster composition for an inorganic board obtained by mixing 100 parts by weight of plaster, 5 to 30 parts by weight of synthetic zeolite A , and 50 to 120 parts by weight of water to form a plaster slurry and then drying the mixture. object. 2. The stucco slurry further comprises 5 to 20 parts by weight of a kneading agent based on 100 parts by weight of the stucco.
A stucco composition for an inorganic board according to claim 1. 3. A mineral board for plaster composition according to claim 1 or 2 including the kneading agent aqueous acrylic resin. 4. A base material of inorganic, plaster board and a for inorganic board plaster composition according to any one of claims 1 to 3 laminated on the base material.