JPS61107979A - Method for preventing color staining due to exudation - Google Patents

Abstract

PURPOSE:To prevent the generation of color staining, by coating the surface of a building material with a stable silica gel coated with oxide of Zn, Mg, Pb, Zr or Sn before drying. CONSTITUTION:An org. acid salt or basic org. acid salt of Zn, Mg, Pb, Ti, Zr or Sn is mixed with a silica sol, wherein colloidal silica with a particle size of 2-150mum is dispersed in water or a hydrophylic org. solvent, to be reacted with said salt. By this method, a silica sol, wherein the surface of silica is coated with one of said metals, is obtained and applied to the surface of a base material such as a building material containing an exudative color substance such as lignin or tannin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for surface modification of building materials containing exudable coloring substances, and in particular to a method for surface modification of building materials containing exudable coloring substances, and in particular to methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing leachable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing leachable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances, and in particular, methods for surface modification of building materials containing exudable coloring substances. The present invention relates to a method for preventing colored stains on the surface of building materials due to leaching of exudable coloring substances contained therein to the surface by coating and drying.

Conventional technology Many building materials containing exudable coloring substances are in practical use.

For example, 1 normal wood, wood plywood, particle board,
Well-known examples include laminated wood boards made by laminating the above-mentioned materials with slate boards, gypsum boards, etc., and cement or gypsum boards made of wood flour, organic fibers, etc.

During long-term use of these building materials, the coloring substances contained in the building materials ooze out onto the surface of the building material, causing the surface of the building material to discolor over time, often resulting in so-called colored staining. This colored stain often occurred, especially on decorative surfaces such as indoor ceilings and a. Is there a way to remove this colored stain with washing liquid? Although there is a method of cleaning contaminated surfaces by using

It is difficult to completely purify it to its original state.

Another way to get rid of this coloring stain is.

It is also known to cover up contaminated surfaces by repainting them with paint, but it is difficult to hide the newly formed gold film.

Since it does not have the ability to prevent coloring substances from oozing out, it has the disadvantage that coloring substances ooze out from the surface vcT' layer again during long-term use, resulting in repeated color staining.

Problems to be Solved by the Invention The purpose of the present invention is to form an a-film on the surface of building materials that has excellent adhesion to building materials, water resistance, weather resistance, durability, etc. as well as the ability to prevent coloring substances from oozing out. According to the present invention, it is an object of the present invention to provide a method for preventing colored stains on the surface of building materials due to leaching of colored substances.

Means for Solving the Problems The method of the present invention for preventing colored stains on the surface of building materials due to leaching of colored substances includes zinc, magnesium, and lead.

Stable fx717 Kasol T- coated with titanium, zirconium or tin oxides is characterized in that it is applied to the surface of the building material and then dried.

The building materials to which the method of the present invention is applied include inorganic, organic, and inorganic/organic composite materials, and coloring and staining of the surface of the building material occurs due to colored substances exuding from inside onto the surface of the building material. It is something to do. Examples include boards made from wood, 0 pillars, 1 plywood, 1 paper, particle board; 2 stones of inorganic cement - Wf4 with wood powder, wood particles,
A building material obtained by mixing organic fibers with paper fragments, organic resin powder, etc. and molding and hardening; combining organic paper, wood boards, acid-containing resin sheets, etc. with inorganic hardened boards such as slate boards, cement, and plaster. A laminate obtained by laminating and bonding together using an adhesive; A decorative building material obtained by forming a coating M containing a colored substance on the surface of a base material such as concrete, mortar, plaster, or slate; Various colored and soiled building materials; and other materials already in use as part of the building.

Examples include walls, ceilings, etc. whose surfaces are colored and stained due to the adhesion of cigarette smoke.

Examples of exudable coloring substances contained in these building materials include:
Ligni/tannin, nicotine/humic acid, acidic and basic pigments 1 Examples include Congo red, bold red, niocone, picric acid, methylene blue, malachite green, clinidine, and the like.

Zinc, magnesium, and lead used in the present invention.

The ultrastable silica sol coated with titanium, zirconium, or tin oxide is a silica sol in which colloidal silica with a particle size of 2 to 150 Flμ is dispersed in water, an R aqueous organic solvent, or a mixture thereof, and zinc.

Totally mixed ash with a solution of magnesium, lead, titanium, zirconium or in situ organic IR salt, basic organic acid salt, inorganic acid salt or basic inorganic acid salt dissolved in water, a hydrophilic organic solvent or a mixture thereof. or JP-A-47-42600, U.S. Patent No. 289279.
It is easily manufactured based on the description in No. 7 Meiji Rules and the like.

The organic solvent used as a dispersion medium for the silica sol is
The organic solvent may be different from the organic solvent used as the solvent for the metal salt, but is preferably the same. Examples of these organic solvents include 1 alcohols such as methanol, ethanol, inglobanol, ethylene glycol, and glycerin; keto/types such as acetonate and methyl ethyl ketone;
In addition to this, morpholine, dimethyl formaldehyde, etc. may also be mentioned, and these may be appropriately selected and used. The above 7 ricazol is
Known methods 9 e.g.

It is obtained by aging a dilute activated silicic acid solution obtained by treating a water glass solution with a cation/exchange resin and adding the necessary KE dialkali.

S10. a concentration of about 1 to 55X, and SiO,
/M, 0 (M indicates LL ML L NH- or a cationic base of an organic base, ) having a molar ratio of 10 or more is used. Above zinc, magnesium, lead, titanium.

Examples of zirconium and tin salts include hydrochlorides, nitrates, phosphates, and sulfates of these metals.

Borate, acetate, formate, oxalate; basic hydrochloride2. Basic nitrate, basic phosphate, basic sulfate, basic borate, basic acetate, basic formate, basic formate; these salts, double salts of basic salts; Li, Ha, Empty salts of alkaline metals, ammonia, etc.; nitrogen-containing organic bases; for example, methylamine.

Examples include acid salts such as diethylamine, trimethylamine, monomethyltriethanolammonium hydroxide, primary amines such as guanidi7, secondary amines, tertiary amines, and quaternary a/monic hydroxides. The above gold, gZn,
Mgt Pb, Ti, Zr or Sn, the acid group of the above organic acid and inorganic acid is R.

In addition, the above LL Na, K # alkali metal,
NH, and the one-field ionic group fcT of a nitrogen-containing organic base, respectively expressed as 0. Organic acid salts of the above metals, basic organic acid salts, no faI#! In the solution of the salt and the basic inorganic acid salt, the cationic group or acid group of the base and the metal are present at a molar ratio of Q and /R of α1 to 10 or a molar ratio of Q/T of α05 to 30, respectively. Preferably, the metal salt, basic salt, or acid salt is contained in the solvent at a concentration of 2 to 50X.

The colloidal particles coated with the oxide of the metal mentioned above are either partially or entirely chemically bonded to the metal atom via oxygen atoms on the surface of the colloid particle from the silica sol, or the metal is in the form of an oxide. It has a structure in which the surface of the colloid particles is coated with 7 liters of colloid particles while being adsorbed onto the surfaces of the colloid particles.

In the stable sopping sol coated with the metal oxide used in the present invention, a small amount of the metal salt may be dissolved, but the smaller the amount, the better.

The stable 7-lykasol coated with the oxide of the above-mentioned metal used in the present invention preferably contains about 2 to 45X of Sin and about 1101 to 8X of the oxide of the above-mentioned metal.

As a method for applying it to the surface of the stable Ricasol T-building material coated with the metal oxide, a conventional method using a spray, a brush, etc. may be used. Also.

Drying may be either natural drying or forced drying.

Effect: If only the stable lycasol coated with the above metal oxide is applied to the surface of the building material, the pores of the aWR surface layer will be impregnated with the above sol, or a liquid film will only be formed on the surface of the building material. . Since this sol plain wood does not have the ability to prevent coloring substances from oozing out, it is necessary to irreversibly gel the sol. This gelation is easily achieved by drying and dehydrating the liquid-repellent membrane formed by applying it to the surface of the building material. The colloidal crystals coated with the oxides of zinc, magnesium, titanium, zirconium, lead, and haba bond strongly with the surface of building materials during drying and dehydration, so the sol is applied to the surface of the building materials and then dried. By doing so, a cured coating film that firmly adheres to the surface of the building material is formed.

The present invention prevents colored stains on the surface of building materials due to oozing of colored substances because the gelled hardened layer of comidoid silica particles whose surface area is made up of the metal oxide has an extremely strong ability to adsorb and capture colored substances. it is conceivable that.

Example 1 Preparation of stable silica sol coated with metal oxide 510w 220X, sio, /Ha, omot
b ratio 5f] (1° colloidal particle diameter 14μ aqueous silica sol 324p, !-slo, 9 degrees 50 N,
810. /Ha, Omotb ratio 9'O.

Aqueous silica sol 120f with a colloidal particle diameter of 12 mμ is mixed with stirring, and zinc acetate is added into this solution.

After the addition was completed, the mixture was gradually stirred vigorously at room temperature for 5 hours at 77O, t, with vigorous stirring, and after 103tD, 7
y Monia water z4F and water 1 (16ft-added PH'
! By adjusting i-4,7, the sol (Ll), (r, +, ), having the composition listed in Table 1,
D+1), (Ll) and (Mu) were each produced in y4.

(a) Coating film test The sol (I4) t prepared in above) was applied with a brush to the surface of wood plywood (S,) with a distribution of 12017-, and after air drying overnight, the surface was further coated with 176 "ff
I Sprayed a gold layer of vinyl emulsion paint (white) and applied a top coat in 2009/Ze, and dried it at room temperature for 1 day to make decorative plywood (P). This decorative board (P) was allowed to stand for 7 days at 50° C. and 100× humidity, then air-dried and the surface was visually inspected using fIIS, but no discoloration was observed on the surface. Separately, 5 drops of water was placed on 36 clI of the surface of the above decorative board (P), and after waiting for it to dry naturally, the surface was visually observed to ensure that no discoloration was observed.

Example 2 A wood plywood ceiling board (S,) that had been used for 10 years and was stained yellowish-brown by cigarette smoke was removed.

From this material, decorative plywood (pt)' was obtained in the same manner as in Example 1 (&''), and 2
When the coating film was tested using the method described by Kashi, no discoloration of the coating film surface was observed in any of the tests.

Example 3 Example 1 (sols (L, ) to (L, ) prepared with in.

Using the same wood plywood (S, ) and (S,) as used in Examples 1 and 2, a second
Decorative plywoods (P, ) to (pu) shown in the table were obtained, and a coating test was further conducted, but no discoloration was observed on the coating surface in any case.

Table 2 Comparative example 1 Instead of the dispersion (Ll) used in Example 1 (-).

810, 30X, SiO,/Na, 0 molar ratio 90
A decorative plywood (C1) was obtained in the same manner as in Example 1 (b) using a silica sol with a particle diameter of 121 μm, and this material was further processed in the same manner as in Example 1 ('') using two methods. When tests were conducted on the paint film, yellowing of the paint film surface was observed in all tests.Furthermore, decorative plywood (AS ) was obtained, and a coating test was conducted on this product, and the results were 1-car test.

In both cases, the paint film surface turned brownish yellow.

To Examples (a) Preparation of stable silica sol coated with metal oxide
WSi2, 20 N, 810. /Ha, O molar ratio 9B, colloidal silica particle diameter 14 m-μ, PFi&
To the aqueous silica sol of No. 2, an aqueous solution of potassium zincate as the sol (-) and an aqueous solution of sodium leadate as the sol (mu) were mixed under strong stirring so that the composition was as shown in Table 3. After the addition was completed, strong stirring was continued for another hour, and then an aqueous boric acid solution was further added to prepare sols (L,) and (M).

(C2) Test of coating film Same as Example 1 (B) except that the above-mentioned sols (L, ) and (M) and gypsum plaster molded board (S,) containing an organic coloring substance contained in phosphate rock were used. Do it.

From (L,) is (PH) @ (LP) is (ptJ
When each of the decorative boards was cut out and a coating test was conducted, no discoloration was observed on the surface of any of them.

Example 5 (a) Preparation of stable silica sol coated with zirconia S, io, 15 X, S10. /Na,O molar ratio 900. A basic zirconium formate aqueous solution containing Zr0.5X f: was gradually added to silica sol 8002 (mixture of water and methanol at a weight ratio of 90:10) with a near Glioid particle size of 71μ under full stirring, By continuing to stir vigorously for 2 hours after the addition is complete! S10*”X-ZrOs 1.5X, formic acid 1.
\X, Contains 8 methanol? A stable silica sol (L,) coated with zirconia was prepared.

(b) Paint film test: 4 types of commercially available adhesives for wallpaper adhesive 100? By adding and kneading the above-mentioned sol (L,) i 20 f, the composite adhesives (DI), (DI), (D
, ) and CD, ).

Table 4 Next, the above adhesive (D) was applied to the surface of the wood plywood (SI).
I) to (DI) were applied at a rate of 70 fltd each.

Immediately paste wallpaper made of commercially available Japanese paper, and then leave it in air at 25°C and relative humidity of 40 to 60X for 7 days.
ff), (XI) and (XI) t- were obtained.

Next, the plates (xl) to (X,) were heated to a temperature of 20 to 55°C.

The wallpaper was fixed on the wall of a bathroom with a relative humidity of 50 to 100X and left for one month, but no discoloration, generation of unspecified discoloration patterns, peeling, blistering, etc. were observed on the wallpaper surface.

Comparative Example 2 Si0.12N, 810. /Ha, O molar ratio 1000
．． A test was conducted on a board pasted with wallpaper in the same manner as in Example 5, except that an aqueous silica sol with a colloidal particle size of 7 μm was used instead of the dispersion (III). When using a composite adhesive with polyvinyl acetate, spot-like bleeding occurred after 7 days, and when using a composite adhesive with polyvinyl acetate adhesive.
After several months, brown discoloration occurred, and in both the composite adhesive with urea resin adhesive and the composite adhesive with polyvinyl acetate adhesive, an unspecified discoloration pattern occurred.

Effects of the Invention As described above, according to the present invention, a hardened film of silica sol coated with a metal oxide can be formed on the surface of a building material very easily, and colored substances exuding from the inside can be captured by this hardened film. The silica sol coated with metal oxide used in the present invention can be mixed with various additives, so it can be used in paints, coating materials, solar, putty, etc. It can also be used as a colored adhesive.

As a 1-mouth tablet with Kitaki additives,...
Aggregates such as tonite, diatomaceous earth, pallite, calcium carbonate, natural rocks, and sand; Dispersants or thickeners such as surfactant pouring agents, polyvinyl alcohol, methylcellulose, carboquine methylcellulose, and polyacrylic acid; Polyvinyl acetate emulsion.

Rubber latex, water-soluble melamine resin, ethylene-vinyl acetate copolymer emulsion I/, aqueous dispersion of polyurethane, alkyd resin, epoxy resin, other organic pigments, other layer color pigments, antifoaming agents, preservatives agents, etc.

After drying and curing, paints, adhesives, sealers, putty, etc. containing the above-mentioned silica sol and additives have excellent adhesion to building material surfaces, water resistance, and weather resistance, and they do not cause surface staining due to leaching of coloring substances. You can obtain building materials that do not require

Claims (1)

[Claims] A method for preventing colored staining of the surface of building materials due to exudation of colored substances, characterized by applying a stable silica sol coated with oxides of zinc, magnesium, lead, titanium, zirconium, or tin to the surface of the building material and then drying it. .