JPS5837345B2 - Fast-curing composition for forming coatings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fast-curing coating film type composition, and its purpose is to cure various types of compositions regardless of the thickness of the coating film or natural conditions. The object of the present invention is to provide a fast-curing composition that forms a coating film with excellent properties, especially water resistance.

The principle of forming a resin emulsion film is the evaporation of water; therefore, unless water evaporates sufficiently, a coating film with various properties that can withstand practical use, such as particularly excellent water resistance, cannot be obtained. .

For example, when forming a waterproof coating on the surface of a building, there is a method of coating the building surface with a thick composition containing a synthetic resin emulsion, but in this case, the water evaporates and the waterproof coating is removed. Formation of a coating depends largely on the thickness of the coating and natural weather conditions, and normally it takes an extremely long time to obtain a coating with good water resistance.

For example, depending on weather conditions, it usually takes several hours to several tens of hours to obtain a coating film with a thickness of several tens of microns, and more than one day if the film thickness is several hundreds or thousands of microns. .

Therefore, it cannot avoid disadvantages such as being difficult to use in high humidity or low temperature conditions, and even after coating, if rain occurs before sufficient film formation, the coated material may wash out.

In order to eliminate such drawbacks and achieve the above objectives,
As a result of many years of research, the present inventors have found that when forming a coating film using a composition containing a synthetic resin emulsion, it is possible to form a coating film by using additives rather than simply leaving it to dry naturally. For example, the present invention has been completed by discovering a composition that can artificially control the time required to obtain a coating film with particularly good water resistance and can quickly control the shape of the coating film.

That is, the present invention provides (4) an emulsion formed by dispersing an acrylic resin or an ethylene-vinyl acetate copolymer resin and containing a nonionic surfactant, and (B) an emulsion containing cement and poorly water-soluble calcium, magnesium, zinc, and aluminum. one or more compounds selected from the oxides or hydroxides of (Q calcium, magnesium,
It consists of one or more water-soluble salts of zinc, strontium and aluminum, and (B) and (Q) per 100 parts by weight of the resin content.
The present invention relates to a fast-curing coating film type composition or composition, characterized in that the amount of each component is from 0.1 to 20 parts by weight.

In the composition for forming a fast-curing coating film of the present invention, the nonionic surfactant in the emulsion of component (4) stabilizes the composition of the present invention and contributes to improving workability. Component (B), cement, and poorly water-soluble oxides or hydroxides of calcium, magnesium, zinc, and aluminum contribute to improving the water resistance of the resulting coating film.

In addition, (Q) a certain amount of water-soluble salts of calcium, magnesium, zinc, strontium, and aluminum improves film forming performance, and together with the above-mentioned component (B) contributes to rapid hardening.

The fast-curing composition for forming a coating film of the present invention can quickly form a coating film with good water resistance without moisture separation, regardless of the thickness of the coating film or natural conditions. It is particularly applicable to external paints, waterproofing compositions for structures, coating materials, and other surface treatment agents.

To give specific examples of the constituent components of the composition for forming a fast-curing coating film of the present invention, (4) the emulsion of a preservative is a synthetic resin emulsion formed by dispersing an acrylic resin or an ethylene-vinyl acetate copolymer resin. and the emulsion contains a nonionic surfactant.

The acrylic resins used here are polymers and copolymers such as acrylic acid and its esters, methacrylic acid and its esters, and one or more of them and vinyl acetate, styrene, vinyl chloride, vinylidene chloride, ethylene, vinyl propionate, etc. It is a resin consisting of a copolymer with two or more types.

Examples of nonionic surfactants include alkyl or alkyl phenyl ethers of polyoxyethylene, sorbitan fatty acids or acyl esters of polyoxyethylene, and oxyethylene oxypropylene block polymers.

The cement of component (B) includes ordinary boltland cement, moderate heat boltland cement, early-strength portland cement, alumina cement, blast furnace cement, etc., and includes poorly water-soluble oxides or hydroxides of calcium, magnesium, zinc, and aluminum. Examples of the material include zinc oxide, magnesium oxide, calcium hydroxide, magnesium hydroxide, etc. In the present invention, cement is preferably used because it better embodies the characteristics of the present invention.

(C) Examples of water-soluble salts of calcium, magnesium, zinc, strontium and aluminum in the precepts include calcium chloride, magnesium chloride, aluminum chloride, strontium chloride, aluminum sulfate, magnesium sulfate, calcium nitrate, strontium nitrate, etc. Salts of inorganic acids, salts of saturated organic acids such as calcium acetate, zinc acetate, calcium acrylate, magnesium acrylate, aluminum acrylate, zinc acrylate, strontium acrylate, calcium citrate, magnesium citrate, Salts of unsaturated organic acids such as calcium maleate, magnesium maleate, calcium gluconate, and calcium propionate are used, and salts of unsaturated organic acids are particularly preferably used in order to embody the features of the present invention.

The present invention has the above-mentioned components as essential components, but in addition, plasticizers, membrane auxiliaries, antifoaming agents, freeze stabilizers, thickeners, fillers, dispersants, crosslinking agents, etc. may also be added. It is possible, and good effects can be obtained depending on the purpose of use.

Next, the proportions of the fast-curing coating or composition of the present invention will be described.

(4) The resin concentration of the component emulsion is usually 40 to 6
The amount of nonionic surfactant contained is preferably 0.1 to 10 parts, more preferably 0.5 parts, based on 100 parts by weight (hereinafter referred to as "parts") of the resin content of the emulsion. ~5 parts, and if it is already present during the production of the emulsion, there is no need to add it again.

(B) The amount of a certain amount of cement and poorly water-soluble oxide or hydroxide is 0.1 to 20 parts, preferably 1 to 10 parts, based on 100 parts by weight of the resin content of the emulsion of component (4). , (C) the water-soluble salt of the precepts is also 0.1 to 20 parts,
Preferably it is 0.5 to 10 parts.

(4) If the content of nonionic surfactant in the emulsion of ingredients is less than 0.1 part, the stability of the composite material will deteriorate and the pot life will be shortened, making work difficult. There is a tendency to

Moreover, when it exceeds 10 parts, the water resistance of the coating film tends to decrease.

(B) If the amount of cement and poorly water-soluble oxides or hydroxides in the prefecture is less than 0.1 part, or if the water-soluble salt of component Q is less than 0.1 part, immediately It is difficult to obtain a water-resistant coating film, and a water-resistant coating film cannot be obtained.

On the other hand, if more than 20 parts of them are used, the pot life becomes extremely short and it becomes difficult to work with them.

The viscosity of the composition in the present invention may be set depending on the application method, but a viscosity of 300 cps or more is usually used.
The upper limit is about 100,000 cps.

The fast-curing film-forming composition of the present invention is applied to the surface to be applied by brushing, troweling, spraying, etc., to form a coating film with a thickness of several tens of microns to several hundred to several thousand microns. It is formed.

When the composition of the present invention is applied to the surface of a building, etc., since the composition of the present invention has quick hardening properties, a certain amount of cement and a poorly water-soluble oxide or It is preferable to mix the hydroxide and the water-soluble salt (component Q) into the emulsion of the active ingredient immediately before application, but it is also possible to prepare the composition in advance and transport it to the construction site for use. Of course it is possible.

Examples of blending methods include (1) blending component (C) into a mixture of component (4) and component (B), (2) blending component (8) into a mixture of component (A) and (Q). (3) A method of blending a mixture of (B) precepts and (Q component) with component (3) cA).

In this case, the timing cannot be determined depending on the type and proportion of the ingredients, but it is usually within several hours, specifically within 5 hours, before painting.

If it is stored for too long after being blended, it tends to gel and become difficult to paint.

It is also possible to carry out each of the above mixtures using a two-component mixing type spray.

In this way, a water-resistant coating film can be obtained in a desired period of time, particularly in a short period of time, for example from 2 hours to several hours, regardless of weather conditions.

In addition, before applying the composition according to the present invention to the surface of a building, etc., the surface may be treated with a base treatment agent or the like, or the coating film obtained by the composition according to the present invention may be coated. Of course, it is not only possible to further provide a surface protective layer on the surface, but such treatment also enhances the performance effects of the coating film obtained from the composition of the present invention and exhibits good effects.

Next, details of the present invention will be explained using examples.

All parts and percentages in the examples are by weight.

The test method is as follows.

(1) Gelation time (time required to reach a plastic state while still containing water): Both (B) and (C) components may be added at the same time before construction, or each may be added in advance. After adding the remaining portion before post-application, the viscosity of the mixture exceeded 100,000 cps (20'C).

(2) Initial water resistance: After 3 hours have passed after spraying the composition, make a cross cut with a utility knife so that it reaches from the surface of the paint film to the base, and soak this sample in water for 30 minutes to test the paint film. Water resistance was observed.

(3) Membrane physical properties: 1) After soaking in water, spray it on the mold shown in JIS A 6021, and after 3 hours have passed, soak it under water for 30 minutes, and then
The coating was cured and the physical properties were measured in accordance with SA 6021 (measurement temperature: 20°C).

1 [) Untreated product According to JIS A 6021 (measured temperature 20'C)
.

(4) Film-forming property on a wet surface: A concrete plate with a thickness of 20 mounds was soaked in water for 24 hours, then taken out, the composition was sprayed on it, and the film-forming property was checked by touch with the fingers.

(5) Water permeability: A water permeability test was conducted according to JIS A 6910 "Multilayer pattern sprayed material".

(6) Uezao test: According to JIS A 6910 (250 hours).

Example 1 60 parts of butyl acrylate, 30 parts of styrene, 6 parts of vinyl acetate, 4 parts of acrylic acid were added to a certain heptanomer combination, 2 parts of sodium dodecylbenzenesulfonate, and 0.3 parts of ammonium persulfate.
100 parts of water were mixed and polymerized in a conventional manner at 70°C for 4 hours to produce a polymer emulsion with a resin concentration of 49%, and then adjusted to pH 6.0 with aqueous ammonia. Adjusted to 5.

(This will be referred to as Emulsion A) 100 parts of the resin content of the above Emulsion A is added to a nonionic surfactant manufactured by Kao Allus ■, and Emulken PP-250.
(oxyethylene oxypropylene block copolymer), 0.2 parts, Foamaster (oxyethylene oxypropylene block copolymer) as an antifoaming agent (
0.1 part (manufactured by San Nopco ■) was added, and further 5 parts of Boltland cement as component (B) and 2 parts of Modicol VDO (manufactured by San Nopco ■) were added as a thickener.

The above formulation was left at room temperature for one month, and immediately before spraying using an air spray, 3 parts of calcium chloride was added as a component of Q.

[Viscosity during spraying is 2000 cps (B type viscometer, 30r
pm, rotor/lf;. 2.20'C)] The pot life of this composition was about 1 hour, after which time the viscosity increased and it was impossible to spray it with an air spray.

This assembly is made into a frame shown in JIS A 6021 "Roof waterproofing coating material" or a vertical 15C77L. horizontal 3
A slate board having a thickness of 0 crrL1 and 1 crIL was sprayed with an air spray gun to obtain a waterproof layer having a film thickness of 1.2 mm, and the above test was conducted.

The test results are shown in Table-1.

Example 2 60 parts of methyl methacrylate, 30 parts of ethyl acrylate,
A heptanomer set consisting of 8 parts of acrylic nitrile and 2 parts of methacrylic acid, 2 parts of sodium dodecylbenzenesulfonate, 0.2 parts of ammonium persulfate, and 100 parts of water were mixed and polymerized in a conventional manner at 72°C for 5 hours. After producing a polymer emulsion with a resin concentration of 47%, the pH was adjusted to 7.0 with aqueous ammonia.
(This is referred to as emulsion B).

The formulation of the other precepts is as shown in Table 1, and the test was conducted in the same manner as in Example 1, except that 2 parts of Bortland cement and 1 part of magnesium oxide were added immediately before the spraying operation (viscosity at the time of spraying). 1200cps).

The test results are shown in Table-1.

Example 3 An ethylene-vinyl acetate emulsion was prepared by a conventional method using a monomer composition of 70 parts of ethylene and 30 parts of vinyl acetate, 2 parts of polyoxyethylene alkylphenol sulfate sodium salt as a surfactant, and 3 parts of polyvinyl alcohol as a protective colloid. was obtained (resin concentration was 48%).

The test was conducted in the same manner as in Example 1 except that the formulation was as shown in Table 1 and 1 part of calcium hydroxide and 4 parts of aluminum acrylate were added immediately before the spraying operation.

The viscosity when blowing is 4000 cps.

The test results are shown in Table-1.

Example 4 To 100 parts of the resin content of emulsion A described in Example 1, 0.5 part of Emulgen 910 (nonionic surfactant, polyoxyethylene nonylphenol ether manufactured by Kao Atlas ■), and 20 parts of Bortland cement. A test was conducted in the same manner as in Example 1 using a composite material to which 1 part of aluminum acrylate was added immediately before blowing.

The viscosity when blown is 1500 cps.

The test results are shown in Table-1.

Example 5 To 100 parts of the resin component of emulsion A described in Example 1, 2 parts of Emulgen 910, 30 parts of calcium carbonate, 30 parts of kaolin, Foamaster O. 2 parts and 10 parts of white cement were added and kneaded well.

One week later, when constructing this kumikaimono on site, 8 parts of magnesium acrylate was added and thoroughly stirred just before the blowing work.

The viscosity during spraying was 7500 cps.

This is the roof of the vent house on the roof of the two-story building (
The base mortar was sprayed onto a surface (10 m long x 5 m wide) to a film thickness of 1.4 m.

After 30 minutes, the viscosity increased significantly and showed a gelatinous state, and after 4 hours, as a water resistance test, water was poured onto the film for about 10 minutes using a hose from a tap, and as a result, it re-emulsified and a resin emulsion etc. flowed. The initial water resistance was good.

Furthermore, as a result of observing the coating film after one week, it was found that there were no cracks, cracks, pinholes, etc., and a uniform and elastic waterproof film had been formed.

Comparative Example 1 A certain composition was prepared from the formulation shown in Table 2 in the same manner as in Example 1 without adding cement or poorly water-soluble oxides and hydroxides and water-soluble salts to Emulsion A described in Example 1. Tested.

As shown in Table 2, the coating film was completely eluted from the cross-cut surface in the initial water resistance test, resulting in a poor result.

Comparative Example 2 Emulsion B described in Example 2 was tested in the same manner as in Example 1 using the composition shown in Table 2 without adding a water-soluble salt.

The coating in this example was done with a brush.

As shown in Table 2, the results were poor in both the initial water resistance and the physical properties of the membrane after immersion in water, as the membrane was washed away when exposed to water during the membrane process.

Comparative Example 3 The same method as in Example 1 was carried out using the composition shown in Table 2 without adding cement or poorly water-soluble oxides and hydroxides to the ethylene vinyl acetate emulsion described in Example 3. .

The coating in this example was done with a brush.

As shown in Table 2, the gel time was as short as 1 minute.
Since it is impossible to spray and is not completely solidified but in a semi-solidified state, during the initial water resistance test, the coating film was either not completely washed away or the solid content was eluted and re-emulsified.

As a result, the physical properties of the film after immersion in water were poor, with both elongation and strength extremely reduced.

Comparative Examples 4 to 6 Compositions having the formulations shown in Table 2 using Emulsion A or Emulsion B were tested in the same manner as in Example 1.

As shown in Table 2, none of the results were satisfactory.

Claims (1)

[Claims] ICA) an emulsion formed by dispersing an acrylic resin or an ethylene-vinyl acetate copolymer resin and containing a nonionic surfactant; and (B) an emulsion containing cement and poorly water-soluble calcium, magnesium, zinc and aluminum. consisting of one or more compounds selected from oxides or hydroxides and one or more water-soluble salts of calcium, magnesium, zinc, strontium, and aluminum, and the resin content of (4) 100 1. A fast-curing coating film-type composition for precepts, characterized in that (B) and (C) are each contained in an amount of 0.1 to 20 parts by weight.