JP2001146459A - Plaster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of voids formed in an interface between primer coating and over coating on a wall in plaster work using plaster. SOLUTION: Cattle bone chips are incorporated with materials such as lime, gloiopeltis glue and fibers for plastering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plaster applied to walls, roofs, earth walls and the like.

[0002]

2. Description of the Related Art Stucco traditionally constructed on plastered walls, earthen walls, roofs, etc. from ancient times is mainly composed of lime, funori, susa,
A material obtained by kneading shell ash or the like with water is generally used. Depending on the construction site, the mixing ratio of the materials varies, and sand, a coloring agent, and the like may be mixed and used. Traditional stucco walls are groundwork (earthy rough wall), middle coat (soil, sand stucco), base coat (plaster),
It is constructed in the order of top coat (plaster). Documents related to the invention include Japanese Patent Publication No. 58-15454 and Japanese Patent Application Laid-Open No. 3-291.
No. 091 and the like.

[0003] The constructed plaster walls and the like are required to have not only mechanical strength but also durability, fire resistance and waterproofness. It is an important condition that this property is maintained for a long time as a wall material. For the purpose of strengthening the plaster wall, to traditional lime,
Various compounds are used in addition to glue materials such as funori, straw, susa and the like. Glass fiber may also be mixed. Many formulas are used to add oyster ash made by baking oyster shells.

[0004]

The plaster to which this oyster ash is added is very hard and water-resistant when applied thickly, and is suitable for roof construction, etc. When used, there is a defect that a so-called "bulk" appears.

[0005] "Buku" means that plaster is usually applied two or more times in order to apply plaster in plastering works such as walls. At that time, it refers to a bubble formed on the contact surface between the second overcoat and the undercoat. Since this deteriorates the strength of the plaster wall, the occurrence of "bulk" must be prevented as much as possible. For that purpose, the dried state of the undercoat plaster becomes important during the second application, that is, during the overcoating. If the undercoat is not dried sufficiently, adhesion to the second coated surface will be poor and the strength of the wall will be reduced. In addition, a phenomenon called so-called "buku" appears, and a cavity is formed between the surface and the overcoat. On the other hand, if the drying is too early, the adhesion of the top coat and the undercoat will be poor, and as a result, the strength of the stucco wall will decrease. This is a very delicate task and requires skillful judgment. It is important that the undercoat is dried quickly and is overcoated before the curing starts, and the curing proceeds integrally. It is preferable that moisture is slightly left before the curing of the undercoat proceeds, and it is desirable that the curing proceeds simultaneously at the top and bottom.
The judgment is subtle and requires skill. Under such difficult conditions, there is a demand for a stucco compound that can be easily subjected to high-quality construction without "bulk".

[0006] As the time progresses, cracks occur on the surface of the constructed plaster wall. Cracks at the bonding surface between the undercoat and the undercoat, and between the undercoat and the overcoat, cause fatal defects in the wall. As a result, the strength is reduced and the water resistance is deteriorated, which causes damage to walls, earth walls and the like. In order to prevent this deterioration, a method of adding fibrous material and shell ash has been implemented. Japanese Patent Publication No. 58-15454 is a method of mixing egg white. However, egg white has difficulty in obtaining raw materials, the product is likely to spoil, and the addition of alcohol for preservation is difficult.
The effect is less persistent than the volatility of alcohol. Further, those kneaded with water have a defect that they become soft and unusable when left for a long time. The addition of the powder obtained by roasting the eggshell of JP-A-3-291091 makes the plaster wall harder but does not improve the workability. Especially when overcoated, there is a defect that a so-called "bulk" appears.

For the purpose of remedying this drawback, oyster ash, a composition in which "ash made of oyster shells" is generally used in many cases, but as described above, it is used for thickening a large amount of roof work and the like. In some cases, it is effective, but it is less effective in the case of repainting walls and the like, and has the property of easily producing "bulk". At present, it depends on skilled judgment and skill in construction.

[0008]

As a means for solving this problem, in the present invention, instead of oyster ash, a composition of stucco is used.
It has been found that adding beef bone meal has a remarkable effect. The characteristic of the stucco containing beef bone powder is water retention due to the gelatinous nature of the beef bone powder. Therefore, drying is faster than oyster ash, but hardens slowly. Therefore, since the curing proceeds simultaneously with the upper coating, there is a feature that a very strong wall can be constructed without generating so-called "bulk". For this reason, we found that the stucco wall mixed with beef bone powder did not crack even after a long period of time, had a small decrease in strength, was resistant to weathering, and could be constructed with good water resistance and fire resistance. did. Furthermore, the stucco to which beef bone powder is added has a smooth and slidable property, that is, "good workability", because the gelatinous substance of beef bone powder is dissolved.

[0009] As a material for comparing the above-mentioned properties, an attempt was made to carry out construction using compositions in which finely divided calcium carbonate and oyster ash were mixed, and the results were compared. However, calcium carbonate had no effect because the surface of the top coat was rough and rough. . Oyster ash was not particularly effective. Further, the experiment was carried out with bone meal of other animals. However, bone and bone meal of pigs and chickens was the same as oyster ash, and none of them was effective in preventing the occurrence of "Buku". Only the addition of beef bone meal had a remarkable effect.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An ordinary stucco composition in which beef bone meal is used instead of oyster ash. The beef bone powder used for the plaster is pulverized by a fine pulverizer and sieved with a mesh 300 sieve. Hereinafter, examples will be described in detail.

[0011]

Example 1 A method for producing bovine bone meal. Fresh beef bone is thoroughly washed with water, dried, pulverized with a fine pulverizer, and sieved with a sieve having a particle size of 300 mesh to obtain a raw material. It should be noted that no effect was obtained with a powder having coarser particles.

[0012]

Example 2 Composition of stucco used for stucco walls and the like. Stucco of this composition can be applied to both top and bottom coatings on walls. The following figures are by weight. 1. Lime 100. 2. 2.5 2.5 Funori 1.5 4. Beef bone meal 0.25. Water 80.0 According to this formulation example, Funori is dissolved in water, and the materials are sequentially added thereto and kneaded well to form plaster. In the composition of this embodiment, a coloring agent may be further added depending on a construction place.

[0013]

Embodiment 3 Embodiment 3 is a sand plaster for intermediate coating, which is effective by applying the following composition. 1. Lime 100.0 2. Sand 75.0 3. Cement 2.5 4. Beef bone meal 0.55. Water 100.0 With this composition, the materials are added to this one by one, kneaded well, and further 6. Cement mortar 400. In addition, knead and adjust sand plaster for middle coat. It has the characteristic that it is slippery and firmly adheres to the plaster.

[0014]

Example 4 In the case of a cement mortar for a base, the following composition is used. 1. 1 cubic meter of cement mortar Cement mortar adjusted with 2 kilograms of beef bone meal is effective for use as a foundation for plaster walls.

[0015]

According to the present invention, when a plaster mixed with beef bone powder according to the composition of the present invention is applied, since the coating is dried quickly and the curing is slow, there is a characteristic that no "bulk" is produced even when the top coating is applied. Therefore, it is easy to judge the timing of the overcoating work, and there is an effect that the time is shortened. It has the advantage of not requiring a high degree of skill. In addition, work efficiency is improved. The constructed plaster wall has high strength, especially compared to the conventional plaster wall.
Since there is no "smear", the occurrence of cracks is very small. It has excellent durability, water resistance, and fire resistance, and does not deteriorate or become brittle even after a long period of time.

Claims (1)

[Claims] 1. A stucco characterized by mixing beef bone powder into a material such as lime, scallop, and scallop.