KR20000067313A - An aqueous inorganic binder comprising liquid silicate, and a paint composition using the same - Google Patents

Abstract

PURPOSE: Water inorganic binder including liquid phase silicate and a lacquer composition using the same which is environment-friendly, durable, and cost-effective are provided. The lacquer can be coated onto the aluminium, stainless steel, wood, and glass. CONSTITUTION: Water inorganic binder including liquid phase silicate and a lacquer composition using the same are characterized in that: liquid phase silicate is stabilized by adding 2-40pts.wt. acid chloride solution having 10-80wt.% into 100pts.wt. of liquid phase silicate.

Description

An aqueous inorganic binder comprising liquid silicate, and a paint composition using the same}

The present invention relates to an aqueous inorganic binder containing a liquid silicate (MSiO3: M represents a metal) such as sodium silicate (Na2SiO3.xH2O) or potassium silicate (K2SiO3) and a coating composition using the same.

More specifically, the present invention relates to an aqueous inorganic binder containing a liquid silicate stabilized using an acid salt and a coating composition using the same.

Conventional oil paints and binders in general use have a huge impact on workers and the environment by using a large amount of organic solvents in production and operation, and many countries, including Europe, are strictly regulated. In Korea, volatile organic substances (V.O.C./ Volatile organic compounds) are regulated to less than 20%. Since this year, they have been applied to paint manufacturers, automobiles, steel structures, shipbuilding, etc., but there are currently no satisfactory alternative paints.

Therefore, the inventors of the present invention can prepare a coating composition having excellent durability and dryness at a lower cost than a conventional coating material without using a volatile organic material, and having excellent adhesion to inorganic materials, which can be applied to various adherent materials. Research efforts have been made to develop inorganic binders.

The present inventors have focused on using liquid silicate (sodium silicate or potassium silicate), which is excellent in adhesion to inorganic materials and surface strength, as an inorganic binder. However, liquid silicate reacts with COx in air after drying to produce carbonates. It is known that it is impossible to use for coating because it causes a phenomenon or dissociates with water when it is in contact with moisture for a long time, thereby degrading the performance of the coating film. This phenomenon is because Na of sodium silicate and K of potassium silicate easily react with water in the air, and have a property of easily reacting with water to form salts such as sodium hydroxide and potassium hydroxide.

That is, in order to obtain a stable coating material against contact with carbon dioxide gas or water in the air, sodium or potassium ions contained in the silicate must be stabilized.

In order to solve the above problems, the present inventors dissolve an acid salt in water to react with silicate, and then, by leaving the precipitate formed therein or by separating by a centrifuge, a silicate having a pH of about 11 reacts with an acid metal salt and reacts with sodium or potassium. The present invention has been completed by discovering that ions are converted into precipitates or stabilized materials, which are not affected by moisture or carbonic acid in the atmosphere.

In addition, the present inventors use acid salt as a method for stabilizing silicate, but by experiments that the desired effect can be obtained by dissolving acid salts of a kind that can achieve the same or the same effect as the components of the adherend. Revealed. That is, aluminum salts (e.g. aluminum sulfate) to facilitate adhesion to aluminum, iron or zinc salts (e.g. zinc chloride, ferric sulfate) to apply to iron, tin salts to apply to glass (Eg, tin chloride) must be dissolved to achieve the desired effect. However, it is not recommended to use chloride in the binder for iron to prevent corrosion. In addition, acid salts such as magnesium chloride, strontium chloride, lithium chloride, barium chloride, cobalt chloride, magnesium sulfate, barium chloride and manganese chloride have ion fixing effects in the silicate, but should be selected in consideration of the physical properties of the adherend.

In order to reinforce the properties of the silicate, an inorganic substance may be added before adding the acid salt. For example, after dissolving sodium tungsten (NaWO 4) and borax (NaB 4 O 7) to supplement the properties of the binder, acid salt is added. You may also do it.

It is also possible to use organics to remove the sodium or potassium ions of the silicates. In other words, when an unsaturated compound such as oleic acid, citric acid or lauric acid is added to the silicate, the product reacts with sodium or potassium ions to cause the product to float upwards. However, an appropriate element must be added for adhesion with a particular adherend.

The inorganic binder of the present invention may be mixed with various pigments and implemented as paints of almost any color, and may be freely applied to glossiness, semi-gloss, and matte.

The inorganic paint according to the present invention is a water-soluble one-component paint composed of 100% inorganic material, and has a specific gravity of 1.20 to 1.30 kg / l. Since the whole is an inorganic material, it has a life of 10 years or more under the influence of ultraviolet rays and the like.

The deposited material is well adhered and applied to both inorganic materials such as iron, aluminum, glass, cement, stone, ceramic products, and wood.

The inorganic binder according to the present invention has an initial state as transparent as water. When the photocatalyst modified with Ti is mixed and applied to the glass, the organic binder improves the decomposition of organic substances by the superhydrophilic function and the energy of ultraviolet rays, so that water does not get wet. It becomes a dust-free glass coating liquid. In addition, when the sunscreen agent is mixed, the amount of ultraviolet light transmitted through the glass is reduced to protect the crops of the glass greenhouse from the ultraviolet rays, thereby improving the freshness and color of vegetables and flowers, and preventing discoloration of curtains and wallpaper inside the building. When the binder of the present invention is mixed with micro silica and applied, the reflectivity is lowered, and C.R.T. It is a low reflection glass that prevents the reflectance of a monitor or a commercial building glass.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 Binder and Paint for Coating on Aluminum

70 g of aluminum sulfate is added to 100 g of water to dissolve.

When 8 g of the aluminum sulfate solution is added to 100 g of sodium silicate and stirred, a gelled substance is produced, at which time about 10% by weight of the gelled solution is added. The solution is left to settle the precipitate, or the precipitate is separated by centrifugation to take a supernatant to obtain a binder.

100 g of the obtained binder was mixed with 0.5 g of a pigment dispersant (BYK 190), 0.2 g of an antifoaming agent (Shin-Etsu Silicone KM-73), 0.5 g of a leveling agent (BYK 190), and 15 g of a white pigment (TiO2). Manufacture paints.

Specific gravity: 1.25 KG / l

Pencil hardness: 5H (Comparative: HB-1H for conventional automotive paints)

-Heat resistance temperature: 400 ℃

-Drying condition:

20 ℃ 30 ℃ Dry touch 30 minutes 20 minutes Solidification 72 hours 48 hours Completely dry 7 days Forced drying 5-10 minutes at 100-150 ℃

-Adhesion to adherends

Paint of the present invention Conventional Water-based Paints Existing oil paint Iron ○ × ○ Non-ferrous metals ○ × △ stainless steel ○ × △ cement ○ ○ △ Glass ○ × △ Organic matter × × ○ wood ○ × ○ stone ○ × △

○: Good / △: Normal / ×: Poor

When the paint according to the present invention is applied to steel and aluminum, cost, time and manpower are saved because the undercoating is unnecessary, which is essential when applying the conventional paint. In addition, the drying time is short (130 ° C., 5-10 minutes treatment), thereby saving energy costs.

Example 2: Binders and Paints for Coating on Iron

25 g of zinc chloride (ZnCl 2) was dissolved in 100 g of water to prepare an acid salt solution <1>.

30 g of ferric sulfate [Fe2 (SO4) 3] was dissolved in 100 g of water to prepare an acid salt solution <2>.

The solution <1> 30g or the solution <2> 5g is mixed and stirred with 100 g of sodium silicate, and the produced precipitate is filtered to prepare an inorganic binder.

In the same manner as in Example 1, a pigment or the like is added to prepare an inorganic paint that can be applied to iron.

Example 3: Binders and Paints for Coating on Glass

An acid salt solution was prepared by dissolving 22 g of tin chloride (SnCl 2) in 100 g of water.

11 g of the solution is mixed with 100 g of sodium silicate and stirred, and the resulting precipitate is filtered to prepare an inorganic binder.

In the same manner as in Example 1, a pigment or the like is added to prepare an inorganic paint that can be applied to glass.

Example 4: Binder and Paint Using Unsaturated Organic Compound

If the mixture is allowed to stand with 100 g of sodium silicate and 0.5 g of oleic acid, the organic matter reacted with sodium is suspended above the solution and separated. A coating material is prepared by mixing a dispersant, an antifoaming agent, a pigment, and the like as in Example 1 to the binder thus prepared.

The paint of the present invention can form a coating film of good properties even on stainless steel, which can be applied at room temperature and did not have a suitable paint with durability, thereby achieving a breakthrough in the coating technology in this field. In addition, the inorganic paint of the present invention can be used as a cement paint having a long life and excellent UV resistance compared to conventional cement paint or stone paint, and acts as a flame retardant paint that is not easily burned when applied to wood.

The paint according to the present invention is environmentally friendly because it does not use organic solvents that are harmful to the human body, and is resistant to ultraviolet rays as compared with the life (2-3 years) of general oil paints whose constituents are generally organic materials. More than a year) and low cost 100% domestic raw materials are advantageous in terms of cost. In addition, it exhibits excellent physical properties (adhesive strength, surface strength) even when applied to inorganic materials such as aluminum, stainless steel, and nonferrous metals, which are difficult to apply as general paints, and to wood and glass.

Claims (6)

An inorganic binder containing liquid silicate as a main component, wherein the inorganic silicate is stabilized by adding 2-40 parts by weight of an aqueous 10-80% by weight aqueous acid salt solution to 100 parts by weight of the liquid silicate. The inorganic binder according to claim 1, wherein the liquid silicate is sodium silicate or potassium silicate. The acid salt according to claim 1 or 2, wherein the acid salt is aluminum sulfate, zinc chloride, ferric sulfate, tin chloride, magnesium chloride, strontium chloride, lithium chloride, barium chloride, cobalt chloride, magnesium sulfate, barium chloride, manganese chloride. Inorganic binder, characterized in that selected from the group consisting of. The inorganic binder according to claim 1 or 2, wherein the liquid silicate is treated with 0.1 to 10% by weight of an unsaturated organic compound by weight of the silicate prior to treatment with the acid salt. The inorganic binder according to claim 4, wherein the unsaturated organic compound is selected from oleic acid, citric acid and lauric acid. 2-40 parts by weight of 10-80% by weight of an aqueous acid salt solution is added to 100 parts by weight of liquid silicate to stabilize the liquid silicate.