JPS6228824B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wall priming material used for priming the surface of a concrete wall.

Traditionally, the surface of concrete walls is beautifully finished by applying mortar as a base coat, intermediate coat, and finishing coat. However, in this case, if mortar is applied directly to a concrete wall that has solidified and dried, the moisture in the mortar will be absorbed into the dry concrete wall, causing the mortar to not adhere well and causing cracks. After thoroughly sprinkling water on the concrete wall, you must apply slag made by mixing cement with water or a synthetic resin adhesive. Especially in the case of slag, it is necessary to apply mortar immediately after applying the slag. Therefore, it has the disadvantage that it is very difficult to paint large areas such as the walls of buildings. Mortar is applied to the surface coated with noro or synthetic resin adhesive to complete the undercoat.
Since the surface of the undercoat is finished smooth, many processes are complicated and troublesome, such as the need to comb the surface of the undercoat to make it rough before it hardens, and to ensure strong adhesion of the intermediate coat. The disadvantage is that it requires a lot of work.

The present invention has been made to solve the above-mentioned drawbacks, and will be described in detail below.

The wall undercoat material according to the present invention uses a mixture of expanded polystyrene beads and crushed expanded polystyrene as the main aggregate, and a small amount of water retention agent and adhesive is added to this, and is mixed with cement and water is added. In addition, it is kneaded together.

When an undercoat material is made using only expanded polystyrene beads as the main aggregate and used as an undercoat layer on a concrete wall surface, it is difficult to apply with a trowel due to its low water retention, and cracks are likely to occur. The strength of the undercoat layer in which such cracks have occurred is low, and it becomes difficult to apply a thin topcoat material such as gypsum plaster to this surface.

In addition, when an undercoat material is made using only crushed polystyrene foam as the main aggregate and used as an undercoat layer on a concrete wall surface, the surface of the undercoat layer becomes rough due to large irregularities and irregularities on the surface of the crushed product. This makes it difficult to apply with a trowel, and it also becomes difficult to apply a thin coat of topcoat material.

The undercoat material made of a mixture of expanded polystyrene beads and crushed expanded polystyrene as the main aggregate, as in the present invention, is less likely to cause cracks when used as an undercoat layer on a concrete wall surface, and is suitable for use as an undercoat layer. The strength, especially the impact strength, is greatly improved, and the surface of the undercoat layer has moderately fine irregularities, and the trowel slippage and trowel separation are particularly good, making spreading coating easier and improving work efficiency. Moreover, not only is it easier to apply a thin topcoat material, but there are fewer cracks.

It is desirable to determine the particle size of expanded polystyrene beads and crushed expanded polystyrene products so that a thin top coat can be applied, and the particle size of the beads should be approximately 3 mm or less.
Preferably, the particle size is 2 to 0.1 mm, and it is even more preferable that the particle size has a distribution so that the undercoat layer has strength. The average particle size of the crushed product is preferably about 5 mm or less, but more preferably larger than the average particle size of the beads. Note that the particle size of the crushed product is the dimension of the particle in the longitudinal direction. In addition, the weight ratio of beads is 3 to 60% by weight, preferably 20 to 50% by weight,
Crushed products are 97-40% by weight, preferably 80-50% by weight
The proportion of

As expanded polystyrene beads and crushed expanded polystyrene products, foamed styrene resins such as polystyrene, polymethylstyrene, copolymers of styrene and isoprene, etc., and polystyrene-modified polystyrene resins can be used.

As the water retention agent, water-soluble or water-absorbing and swelling powders and fibers such as polyvinyl alcohol, water-soluble polyvinyl alcohol fibers, paper powder, etc. can be used. A water retaining agent selected from polyvinyl alcohol or its fibers and having a dissolution temperature in water of room temperature or lower is preferred because it is easily dissolved and homogenized when mixed with cement in water.
Fibrous water-soluble polyvinyl alcohol not only has the effect of making it difficult to classify and ensuring a uniform mixing state when beads and crushed products are mixed and stored in a container such as a bag, but also has the effect of ensuring a uniform mixing state. It is more preferable to mix it with cement in water, because when it swells or dissolves, no agglomerates are formed, the mixture swells or dissolves uniformly, and uniformity can be maintained.

This water retaining agent accelerates the hardening of the cement in the primer, which in turn leads to improved adhesion between the concrete wall surface and the primer, and between the beads and the cement phase.

An adhesive is used to facilitate the bonding between the beads and the cement phase, and examples of this adhesive include powders or aqueous solutions of methyl cellulose, methyl cellulose ether, acrylic esters, vinyl acetate, polyvinyl alcohol, and acrylic resin. , an emulsion of ethylene-vinyl acetate copolymer, etc. can be used.

Next, an example of the present invention will be shown and a construction method thereof will be described.

Example expanded polystyrene beads (average particle size 1.5mm)
…40% by weight (55) Crushed polystyrene foam (maximum particle size 3 mm, average particle size 1.5 mm) …60% by weight (55) Methyl cellulose ether …50 g Water-soluble polyvinyl alcohol fiber …11 g Mix together with 1 bag of cement (40 kg) in a mixer, then add about 20 to 22 and mix well to make the undercoating material. Using a trowel, apply this undercoat material to a thickness of 3 to 5 mm on the wall surface that has been previously sprinkled with water. After 24 hours, water the plants for water curing.
Thereafter, it was left as it was for two days or more, and then a top coat material was applied thereon.

The workability of this undercoat was good, and no cracks were observed. In addition, cracks may occur even after 6 months have passed after applying the top coat.
No peeling from the concrete wall surface was observed.

As mentioned above, the wall priming material of the present invention is made of a mixture of 3 to 60% by weight of expanded polystyrene beads and 97 to 40% by weight of crushed expanded polystyrene, and a small amount of a water retention agent and an adhesive added thereto. Since it is made by mixing concrete and cement, adding water and kneading them together, the undercoat can be completed just by applying it to the concrete wall surface that has been sprinkled with water, and by applying a topcoat material on top of that, the wall surface can be finished beautifully, making work more efficient than before. can be significantly improved, and strength can also be improved. In other words, the combination of adhesive and water retention agent creates a strong bond with the concrete wall surface, which not only eliminates the need for adhesive application, but also eliminates the need for troweling and troweling due to the combination of foamed polystyrene beads and crushed foamed polystyrene. It also makes it easier to spread the coating, which greatly contributes to the efficiency of the work.Also, it creates moderately fine unevenness on the surface of the undercoat layer, so it has the same effect as combing and can be used for combing. Not only can this be made unnecessary, but it can also be finished with a thin coating of gypsum plaster or the like. In addition, the combination of expanded polystyrene beads and crushed expanded polystyrene products allows the beads to intervene on the uneven surface of the crushed items, reducing the incidence of cracks, improving the strength of the undercoat layer and top coat layer, and improving heat insulation and heat retention. .

Claims (1)

[Claims] 1. A wall undercoat material consisting of cement, aggregate, and water, in which the aggregate consists of a mixture of 3 to 60% by weight of expanded polystyrene beads and 97 to 40% by weight of crushed expanded polystyrene, and a water retaining agent and an adhesive. A wall undercoat material with added.