JPH05132349A - Cement plaster - Google Patents

Abstract

PURPOSE:To prevent cracks from forming by mixing roasted eggshell powder in a material prepared by mixing lime with glue plant, fiber for plastering, shellfish ash, etc. CONSTITUTION:A cement plaster is obtained by sufficiently washing eggshell with water, drying the washed eggshell in the sun, subsequently placing the washed egg shell on an iron plate, heating the dried eggshell over a fire of a gas burner, roasting the eggshell while stirring the eggshell, discoloring the eggshell to a light yellowish brown color, heating the eggshell until the whole becomes a uniform color, then pulverizing the heated eggshell, subsequently mixing 100 pts.wt. lime with 1-2 pts.wt. roasted eggshell powder and further prescribed amounts of glue plant, fiber for plastering, shellfish ash, etc., preparing mixed powder, adding a prescribed amount of water to the prepared mixed powder and kneading the mixture. Sand, glass fiber, etc., as necessary, are added and applied. Thereby, a glossy cement plaster wall without cracking is obtained.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art The plaster that has been used for a conventional painted wall is mainly used by kneading lime, funori, soot, shell ash, etc. with water. The mixing ratio of materials changes depending on the construction site, etc., and sand, colorants, etc. are also mixed and used. The constructed plaster wall is required to have mechanical strength as well as heat insulation, fire resistance and waterproofness. It is an important condition for wall materials that this property is maintained for many years. For the purpose of strengthening the durability of the wall, there is a method of mixing vegetable oil in addition to a paste material such as funori and natural fiber such as grass and straw [Japanese Patent Publication 58-15454]. Shell ash is traditionally mixed. There is also a method of mixing glass fibers.

[0003]

The conventional plastered wall has a drawback that cracks occur in the wall over time. As a result, the mechanical strength is lowered, the water resistance is deteriorated, and the life of the wall is shortened. In the case of undercoating, there is a defect that the adhesion between the wall and the base is reduced. The use of egg white makes it difficult to obtain the raw material and easily causes spoilage, and the effect of alcohol addition is not permanent due to the volatility of the alcohol.

[0004]

SUMMARY OF THE INVENTION The present invention has been solved by incorporating roasted egg shell powder into conventional plaster material for the purpose of improving the above-mentioned drawbacks of plaster walls. It was discovered that the stucco wall constructed by mixing the powder of roasted egg shells is stiffer, glossier than the conventional plaster wall, has less cracks, and has less embrittlement even after a long period of time. did. It has the feature that a wall with a long service life can be constructed. The amount used is lime 10
It is 1-2 parts [parts by weight] with respect to 0 parts.

[0005]

Example 1 The present invention will be described with reference to examples. A method of making roasted egg shell powder. Wash the eggshell thoroughly with water and dry in the sun. Place it on an iron plate and heat it from below with a gas fire. Roast while stirring. After a while, the egg shell turns a pale yellowish brown color.
When everything has a uniform color, stop heating and cool. It is made into powder with a mill and used.

[0006]

[Example 2] An example of compounding materials will be shown. The mixing ratio depends on the weight. 1. Stone ash 100 2. SUSA 3 3. Funori 8 4. Shell ash 8 5. Roasted egg shell powder 1 6. Water 80 According to this formulation example, funori is dissolved in water, materials are sequentially added thereto, and the mixture is kneaded to form plaster. In the formulation of this example, sand, glass fiber, etc. may be further added depending on the construction site. It also applies to formulations that do not use shell ash.

[0007]

Example 3 Example 2 is mainly a compounding example of plaster for top coating, but it is also applied to plaster for undercoating. An example is shown. 1. Stone ash 100 2. SUSA 3 3. Powder funori 3 4. Roasted egg shell powder 1 5. 5. A powder prepared by adjusting the mixture ratio of shell ash 4. 6. Add water 90 to the stucco made by kneading, and 7. Add cement mortar 400 to make plaster for the groundwork. In addition, it is effective to mix the powder of the roasted egg shell also in the intermediate-coated clay wall and cement mortar.

[0008]

The plaster wall adjusted and constructed according to the present invention has high mechanical strength and is characterized in that the wall surface is stiffer, glossy, and has less cracks than conventional plaster. It has excellent water resistance and fire resistance, and has the characteristic that the wall does not become brittle or deteriorate over the years.

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Claims (1)

[Claims] 1. A plaster characterized in that a powder of roasted egg shell is mixed with a material obtained by mixing lime, funori, soot, shell ash and the like.