JPS61159466A - Topcoating composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. which can form a new wall surface merely by applying it directly to a stained old surface, by blending a water-soluble nonionic paste and a cationic synthetic resin emulsion with a principal component composed of an org. or inorg. aggregate and a pigment. CONSTITUTION:A nonionic paste (A) (e.g. methylcellulose) which is water-soluble but is not dissociated into ions in water, and a cationic synthetic resin emulsion (B) (e.g. cationic vinyl acetate emulsion) are blended with a principal component (C) composed of a mixture of an org. or inorg. fibrous material, a particulate matter, a flaky material or their ground product (e.g. ground pulp) and a pigment to obtain the desired top coating compsn. When the compsn. is applied to a stained old wall, water-soluble anionic material such as lignin is caused to agglomerate and gel by the action of said cationic material, whereby pollution is prevented and at the same time, a new wall surface can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a top coating composition that is most suitable for repairing the surface wall surface of interior and exterior wall covering materials.

<Prior Art> Conventionally, when the surface wall surface of interior and exterior wall covering materials becomes dirty and it needs to be repaired, (1) the contaminated surface wall surface is removed and a new wall surface is formed by painting.

(2) Without removing the contaminated surface wall surface, apply an anti-accumulant over it, and then form a new wall surface on top of it by painting.

methods have been adopted.

<Problems to be solved by the invention> However, in method (1), the contaminated surface right wall is completely removed, making it impossible to live in during the improvement period.

■ Construction takes a long time. ■ Construction costs are high.

There were drawbacks such as. Especially when repairing interior walls■
There was the troublesome problem of not being able to live there and requiring another temporary residence.

Also, method ('2J) requires less effort than method (1) because it does not require removing the contaminated surface right wall, but
This method uses, for example, a cationic emulsion and an adsorbent to absorb and fix dirt on the surface wall, and it is applied as an anti-slip agent on the right wall, so it takes a long time to dry. Furthermore, a topcoat had to be applied over this, and there was still room for improvement in terms of construction time and cost.

Means for Solving the Problems> The present inventors have discovered that the contamination of the wall surfaces of the wall covering materials described above is caused by anionic water-soluble contaminants typified by lignin contained in wood and wall surfaces. If a coating composition containing a component that causes lignin to coagulate or gel (insolubilize) is used, it can be applied directly to the convex wall without removing the contaminated right wall or using an anti-slip agent. The inventors have discovered that contamination can be suppressed or prevented and a new wall surface can be provided by simply spraying or spraying, leading to the present invention.

That is, the top coating composition of the present invention uses organic or inorganic fibrous materials, granular materials, flakes, or a mixture of pulverized products thereof and a pigment as the main material A, and this main material A and a nonionic water-soluble material. It consists of a cationic adhesive material B and a cationic synthetic resin emulsion C.

<Function> As mentioned above, contamination of wood and old wall surfaces is caused by anionic water-soluble contaminants represented by lignin contained in them. By applying a coating composition containing a nonionic water-soluble adhesive and a cationic synthetic resin emulsion directly onto the old wall, this contaminant is aggregated or gelled (insolubilized), and the new contaminant is applied onto the convex wall. It is characterized by forming a painted wall surface.

Examples of such cationic substances include cationic synthetic resin emulsions, and by using them, not only can they be effective in preventing oxidation, but they can also be used to improve strength. be.

The nonionic water-soluble adhesive is used as a binder between the main material and other materials, as well as as an adhesive for the wall surface of this coating composition and as a thickener to provide workability for troweling.Hydroxypropylcellulose (HPC), hydroxypropyl starch (HPS > methyl (hydroxypropyl) cellulose (MHPC), methyl cellulose (
MC), hydroxyethyl cellulose (HEC), polyvinyl alcohol (PVA), hydroxypropyl guar gum (HPG), polyethylene oxide (PEO)
) etc. are used.

In this invention, organic and inorganic fibrous materials, granular materials, and flake materials used as main materials include J) S
Powder valves, wood flour, powdered clay and natural sand as inorganic granules specified as fibrous topcoating materials in A-6908;
Granular or pulverized materials such as inorganic rocks, inorganic minerals, pulverized mineral slag, and ceramic products are used, and these may be used alone or in a mixture with pigments.

Next, as for the cationic synthetic resin emulsion, the types of polymers that make up the cationic emulsion are vinyl acetate resin, ethylene-vinyl acetate copolymer resin, acrylic-vinyl acetate copolymer resin, acrylic ester copolymer resin 1, styrene-acrylic There are acid ester copolymer resins, synthetic rubbers, etc. (1) Should cationic activators be used for these resins?

Or an emulsion made by emulsifying a cationic water-soluble resin as a protective colloid.

(2) When producing these resins, cationic monomers such as aminoalkyl (meth)acrylate, vinylpyridium halide, aminomethylacrylamide, and diallylammonium halide are copolymerized and emulsified to form an emulsion.

etc. are appropriate.

As for the amount of nonionic water-soluble adhesive to be added, in the case of a troweling material, the amount of water suitable for troweling is determined depending on the material used, and of course the water content in the cationic synthetic resin emulsion is also taken into consideration.

The nonionic water-soluble adhesive gives the necessary viscosity for troweling with respect to this amount of water, and this viscosity is 1000 to 1
A range of 0000G+18 is appropriate.

Furthermore, since nonionic water-soluble adhesives vary in their molecular weight from low to high viscosity products, it is preferable to define their addition by viscosity rather than by quantity.

However, the upper limit may be determined based on the amount of water used in the trowel coating material, necessary improvements in performance such as moisture resistance, adhesiveness, etc., and on economic grounds.

In this invention, pigments used as one of the main materials together with organic or inorganic fibrous materials, granules, flakes, or crushed products include clay diatomaceous earth, zeolite, alumina, activated clay, activated carbon talc, and oxidized clay. It is preferable to use inorganic pigments such as iron, chromium oxide, and titanium white, and organic pigments such as phthalocyanine green, phthalocyanine blue, and bisazo yellow.

In any case, the coating composition of the present invention preferably has a pH of 8 or less.

<Example> This invention will be explained below with reference to Examples.

Various cationic compounds shown in Table 1 were added to a composition in which 1000 parts by weight of a 2% methylcellulose aqueous solution was blended as a nonionic water-soluble glue into an aggregate consisting of 70 parts by weight of a pulverized valve product and 290 parts by weight of a pulverized white polyester resin. Each resin emulsion is blended to form a composition for applying with a trowel,
Each of these compositions was applied with a trowel to a thickness of 1 m4 on test plates that had been coated with a 2% lignin aqueous solution ioo'ti and dried.
After drying at room temperature for 8 hours, the state of contamination was visually confirmed. The composition without the cationic synthetic resin emulsion showed brownish contamination, but the composition with the cationic synthetic resin emulsion of this example was added. A beautiful white painted surface with no contamination was obtained.

Furthermore, regarding these compositions, JISA-69
08 We conducted tests on the moisture resistance and adhesion of the fibrous top coating material, and the results shown in Table 1 were shown (q), and it was recognized that these properties were improved by using a cationic synthetic resin emulsion. .

Furthermore, similar results were obtained even when the type of nonionic water-soluble adhesive was changed.

In Table 1, 3024 and 300 4 were selected as the blending amounts of the cationic synthetic resin emulsion, but when the trowel coating material of this invention is commercially available, the minimum packaging unit is 1 tsubo (3.3rn2). Yes, and the synthetic resin emulsion that is usually added for 1 tsubo has a minimum of 1002 and a maximum of 1000? is rarely exceeded. 1
0i/tsubo is 30) Meng, 10009/tsubo is 3009
4, we selected this amount and conducted the experiment.

Table 1 <Effects of the Invention> As detailed above, the present invention comprises at least one of a nonionic water-soluble glue and a cationic synthetic resin emulsion in the main materials consisting of organic and inorganic aggregates and pigments. This is a coating composition that contains seeds, and this cationic substance aggregates and gels (insolubilizes) anionic water-soluble contaminants such as lignin contained in wood and old walls, thereby preventing the occurrence of contamination. At the same time, a new wall will be created above the old village.

Claims (2)

[Claims] (1) The main material is an organic or inorganic fibrous material, granular material, flake material, or a mixture of these crushed products and a pigment, and the main material is combined with a nonionic water-soluble glue material and a cationic synthetic resin emulsion. A top coat coating composition characterized by: (2) The top coating composition according to claim 1, wherein the nonionic water-soluble adhesive is water-soluble and does not dissociate into ions in water.