JPS58539B2 - Cement-resin finishing material layer construction method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for constructing a cement-resin finish layer consisting of four steps, and more specifically to a method for constructing a stucco finish in which cement and synthetic resin are suitably adjusted or combined. .

The invention also relates to a method of applying a stucco finish that has excellent adhesion to any substrate.

Furthermore, the present invention provides a method for forming a decorative cement finish with a cement-resin finish layer, which has very little occurrence of paint film cracking due to drying shrinkage after painting and exhibits strong resistance to contamination. It relates to construction methods using processes.

Conventionally, when applying a stucco-like coating to the surface of a building or building material, the plastering method is mainly done by mixing natural stone aggregates such as silica sand or Kansui 5 sand with Portland cement and adjusting the composition to a high viscosity. However, materials using only cement as a binding material are generally focused solely on the aesthetics of the surface shape, and have no relation to the physical properties of the coating film. It was being handled.

However, as the construction industry changes due to the shorter construction period and improved functionality of buildings and the modernization of building materials, that is, as the use of concrete and cement-based building materials increases, adhesiveness, which has not been much considered until now, has changed. Waterproof,
Various problems related to advances in physical properties such as weather resistance have been highlighted, and conventional materials made only by adjusting cement are no longer able to deal with these problems.

This invention was made in order to create a construction method of matching materials that shortens and modernizes construction, and is especially suitable for very thick stucco on surfaces such as unevenness, unevenness, junk, damage, etc. of the base for painting. It is intended to form a coating film in the shape of a surface, thereby adjusting the unevenness and improving the concealment of rough substrates.
At the same time, after forming a coating film that firmly adheres to the base, it has extremely high physical properties such as waterproofness and weather resistance, and is also resistant to external injuries and vibrations and shocks of the base itself, making it a revolutionary product. It was completed using a traditional method.

That is, in forming the cement-resin finishing material layer, the present invention includes: (1) a first step of coating a synthetic resin emulsion on an arbitrary base; (2) consisting of Portland cement, synthetic resin emulsion powder, and aggregate. The second step is to apply an inorganic paint in the form of a slurry, (3) the third step is to press the top of the coating film in (2) with a trowel or roller before drying, and (4) to apply synthetic resin varnish or enamel. The fourth step is to achieve excellent workability and coating film properties by appropriately adjusting each material described below.

The synthetic resin emulsion to be applied to any substrate in the first step of the present invention includes acrylic ester, methacrylic ester, vinyl acetate, styrene, ethylene, dibutyl maleate, beoba, vinyl propionate, butadiene, acrylonitrile, and vinyl chloride. It is a general term for aqueous dispersions of thermoplastic resins such as epoxy, urethane, and thermosetting resins such as acrylic acid amine esters, but it is particularly important for the suction ability to the substrate and the adhesion performance of inorganic paint in the second step. In order to improve the emulsion particle size of the synthetic resin, set it to 0.03.
This effect cannot be obtained unless the emulsion is maintained at ~0.2 micron, and the coating amount of the emulsion is also approximately 30-50 g/m.
If it is not 2 (however, depending on the solid content), there will be a decrease in waterproofness, a decrease in adhesion, and furthermore, efflorescence will likely occur in the coating film.

The inorganic paint used in the second step is essentially composed of Portland cement, synthetic resin emulsion powder, and aggregate, and water is added to this to form a slurry that is used for painting.

Synthetic resin emulsion powder is made by drying emulsion-polymerized synthetic resin without forming a fusion-polymerized film.When mixed with water, it exhibits an effect similar to that of an aqueous dispersion, but there are various types. However, in the present invention, a powdered vinyl acetate resin emulsion having good compatibility with Portland cement is most suitable.

Now, by using a binding component consisting of Portland cement and synthetic resin emulsion powder and adding the aggregate described below to this, an inorganic paint with very good coating suitability and coating film properties is prepared.

That is, when the present inventors prepared the paint with fine river sand using conventional methods, a stucco-like paint film was formed, but pinholes and cracks appeared everywhere, and moreover, it was difficult to see from the outside. It was not good because it was fragile to scratches and stress.

Therefore, by using relatively coarse aggregate, it is first strengthened against external scratches and stress, and furthermore, by having an appropriate particle size distribution, pinholes and cracks are reduced, and the composition is set to meet the purpose of the present invention. did.

In particular, the particle size distribution of the aggregate is such that aggregate with a diameter of approximately 0.3 to 0.8 mm, aggregate with a diameter of approximately 0.8 to 1.2 mm, and aggregate with a diameter of approximately 1.2 to 2 mm.
．． 5mm aggregate at a weight ratio of 1:0.3 to 2.
They are mixed at a ratio of 0:0.5 to 1.5.

When the above ratio is exceeded, for example, the diameter is about 0.3 to 0.8
If there is less aggregate of mm, the surface becomes rough and cracks are likely to occur, and the coating film is full of gaps, making it difficult to adhere to the surface.
It has poor waterproof properties, and if there is too much of it, in addition to the above-mentioned drawbacks, the makeup will not look sharp and will lack the luxury of makeup.

In addition, if the aggregate diameter is 1.2 to 2.5 mm, the paint film will crack everywhere, resulting in a decrease in waterproofness, making it impossible to create a luxurious design, and if there is too much aggregate, it will be difficult to install it on the wall. There is a risk that the adhesive will peel off violently, resulting in a decrease in adhesion.

Furthermore, the aggregate with a diameter of about 0.8-1.2 mm is in the particle size range between the aggregate with a diameter of 0.3-0.8 mm and the aggregate with a diameter of about 1.2-2.5 mm, and the overall particle size composition is It covers.

The aggregate in the non-liquid paint used here has been described above, but the form of the composition forming the inorganic paint is approximately 2 to 20 parts by weight of synthetic resin emulsion powder and aggregate based on 100 parts by weight of Portland cement. If the amount of the synthetic resin emulsion powder is less than about 2 parts by weight, the caking properties of the paint will decrease and desired adhesion will not be obtained; If the amount exceeds 20 parts by weight, the drying of the synthetic resin emulsion components is delayed, which tends to cause primary efflorescence to occur in the dry parts of the coating film.

If the amount of aggregate is less than about 70 parts by weight, cracks are likely to occur due to drying shrinkage of the inorganic pigment, and if it exceeds about 150 parts by weight, aggregate scattering becomes large and waterproofness and adhesion are significantly reduced.

The third step consists of pressing the top part with a trowel or roller after applying the inorganic paint in the second step and before drying, preferably within 1 to 3 hours after application. There are no particular limitations to this, but it involves moistening the surface to be pressed with water and pressing lightly, forming a small flat shape at the acute angle of the convex surface.
Since it has a so-called trapezoidal cross section, the pattern may vary slightly depending on how it is pressed.

Since it is impossible to press down the inorganic paint after it has dried, it is essential to do this before drying.

The fourth step consists of finishing with synthetic resin varnish or enamel, and is carried out after the inorganic paint has dried.

There are no restrictions on the type of synthetic resin, and either solution or water-based resins can be used freely.In short, the inorganic paint film comes into direct contact with the atmosphere in the stages up to the third process. Therefore, it is useful to prevent efflorescence of the coating film, discoloration due to efflorescence, etc., and to further improve the aesthetic appearance of the finishing material layer of the present invention.

The present invention consists of four steps, steps 1 to 4 above, and the cement-resin finishing material layer obtained in this way shows a remarkable combined effect of inorganic and organic materials, and has excellent adhesion to the base. It has good properties, with very little occurrence of coating film cracks due to drying shrinkage, and exhibits strong resistance to staining.

Examples are shown below. Example 1 The inorganic paint used in the second step was prepared in advance as follows.

First, lightweight aerated concrete is selected as the base, and an acrylic-styrene copolymer resin emulsion (particle size 0.05-0.2 microns, viscosity 500 centipoise, solvent thickened type) is applied to this at a coating amount of 40 g/m2. Paint all over the base, and after about 3 hours, apply the inorganic paint adjusted above at a coating amount of about 10 kg/m2, and after 2 hours, press down with a plastering trowel to reduce the height of the top from 12 mm to 9 mm. Ta.

After drying, apply 500g using urethane resin enamel.
/m2 was coated uniformly on the coating film.

The cement-resin finishing material layer obtained in this way is
When a coating test was conducted according to 6909, it was found to fully satisfy the standards.

In addition, water permeability and adhesion strength after water immersion were measured in accordance with JISA6910 and were found to be quite good.

The test results are shown in Table 1. Examples 2 to 5 In Example 1, the inorganic paint used in the second step was prepared as shown in Table 2, and a coating test was conducted according to Example 1, with the results shown in Table 3.

Comparative Example 1 In Example 1, the first step was omitted to obtain a cement-resin finish layer, and the results shown in Table 3 were obtained.

Comparative Example 2 In Example 1, the inorganic paint in the second step had a diameter of 0.3
~0.8mm diameter without using aggregate of 0.8mm to 1.2m
A coating film test was conducted according to Example 1, and the results shown in Table 3 were obtained.

Claims (1)

[Claims] 1. When forming a cement-resin finishing material layer, (1) a first step of coating a synthetic resin emulsion on an arbitrary base; (2) a mixture of Portland cement, synthetic resin emulsion powder, and aggregate; (3) The third step is to press the top of the coating film in (2) with a trowel or roller before drying, and (4) apply synthetic resin varnish or enamel. A method for constructing a cement-resin finishing material layer, comprising a fourth step of painting. 2 In Claim 1, the synthetic resin emulsion used in the first step has a particle size of 0.03 to 0.2 microns, and the applied amount in terms of solid content is about 30 to 50 g/m. A method for constructing a cement-resin finishing material layer characterized by: 3 In claim 1, the inorganic paint used in the second step is about 2 to 20 parts by weight of synthetic resin emulsion powder and about 70 to 1 part by weight of aggregate based on 100 parts by weight of Portland cement.
50 parts by weight of a cement-resin finishing material layer. 4. The method for constructing a cement-resin finishing material layer according to claim 1, wherein the synthetic resin emulsion powder used in the second step is a powdered vinyl acetate resin emulsion. 5 In claim 1, the aggregates used in the second step are aggregates with a diameter of about 0.3 to 0.8 mm and aggregates with a diameter of about 0.8 to 1 mm.
．． It is characterized by a mixture of aggregates with a diameter of 2 mm and aggregates with a diameter of approximately 1.2 to 2.5 mm in a weight ratio of 1:0.2 to 2.0:0.5 to 1.5. Construction method of cement-resin finishing material layer. 6. The method for applying a cement-resin finishing material layer according to claim 1, characterized in that the amount of inorganic paint applied in the second step is about 4 to 15 kg/m2.