TWI792860B - Structure of transparent waterproof coating for buildings to prevent sunlight decay and the application method - Google Patents

Abstract

A structure of transparent waterproof coating for buildings to prevent sunlight decay and the application method, comprising a primer structure layer and a topcoat structure layer applied to the wall in sequence. The main feature is that the primer structure layer contains polyacrylate dispersion, polypropylene glycol, cellulose, preservative, and water. The structure is applied to the wall to dry and form. The topcoat structure layer contains polyacrylate dispersion, polypropylene glycol, preservative, zinc oxide, zinc pyrithione, and water mixture. The structure is applied to the primer structure layer to dry and form.

Description

Building transparent waterproof coating structure and its application method for preventing sunlight decay

The present invention relates to the technical field of a transparent waterproof coating on the exterior wall of a building that prevents sunlight decay, and particularly refers to a coating structure that has the characteristics of beauty, support, anti-cracking, sun protection, waterproof, shock resistance and anti-smog.

Please refer to Comparative Example 1 in Figure 1. The cement, stone and wall bricks commonly used in buildings are attached to the exterior wall to achieve an elegant and tidy appearance. However, after a long period of use, the directly exposed wall has undergone various climate changes. Erosion and erosion of environmental substances are prone to solar deterioration and moisture seepage into the wall, or cracks caused by earthquakes affect the building materials inside the wall and cause decay and corrosion; both existing solutions use knocking It is time-consuming and labor-intensive to remove or repair with mud, and it is accompanied by a large amount of construction waste, which has a great impact on the environment.

Conventional technology uses waterproof and sunscreen means for exterior walls to apply primer first on the stone or wall bricks on the wall, and then apply multiple waterproof primers and PU topcoats. And in order to prevent cracks in the coating, after applying a layer of primer, a high-fiber anti-cracking cloth mesh will be laid first, and then multiple layers of waterproof primer layers will be applied to increase the thickness and elasticity of the waterproof coating, and finally apply One or two top coats for added protection. However, this waterproof method, except that the anti-cracking cloth mesh cannot be fused with the primer, is easy to separate, and There is no grafting layer between the primer and the building wall and between the primer and the topcoat, so that the waterproof primer cannot be tightly grafted with the wall and the waterproof topcoat. Therefore, in addition to reducing the waterproof effect of the coating, as long as As soon as the climate changes drastically, the paint body will shrink, causing the coating to fail to adhere continuously and to maintain the waterproof effect. Moreover, the PU topcoat materials commonly used today are usually unable to effectively resist long-term sun exposure, resulting in yellowing and discoloration of the waterproof coating after a period of sun exposure, or even embrittlement and peeling off, resulting in deterioration of the building appearance and loss of coating. layer effect.

The main purpose of the present invention is to provide a building exterior wall with beautiful appearance, supportive force, anti-cracking, sun protection, waterproof, shock resistance and anti-smog characteristics, which is a coating applied at least twice on the wall surface.

In order to achieve the above and other objects, the present invention provides a building transparent waterproof coating structure that prevents solar decay, comprising: a primer structure layer, formed by applying a primer mixture to a wall surface, the primer The mixture contains 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol, 2wt% to 3wt% cellulose, 0.5 to 1.5wt% preservative and the balance water; one side is coated with a structural layer , formed by applying a topcoat mixture on the primer structure layer, the topcoat mixture contains 27wt% to 33wt% of polyacrylate dispersion, 3wt% to 5wt% of polypropylene glycol, 0.5 to 1.5wt% of Preservatives, 0.1wt% to 3wt% of zinc oxide (Zinc oxide) and 0.024wt% to 3wt% of zinc pyrithione (ZPT, Zinc pyrithione), 38wt% to 42wt% of additives, and the balance of water; wherein , the additive includes a dispersant and a viscous agent.

In order to achieve the above and other objects, the present invention also provides a method for constructing a transparent waterproof coating structure for preventing sunlight decay, which comprises the following steps: Brush or spray with high-pressure water to remove dust and dirt on the surface and gaps of the wall, and let it stand for at least three days to make the wall dry; apply a primer mixture evenly on a wall, and let it stand for at least three days. Leave for at least 5 hours to form a primer structure layer, the primer mixture comprising 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol, 2wt% to 3wt% cellulose, 0.5 to 1.5wt% % preservative and the rest of the water; the topcoat mixture is evenly applied to the primer structure layer, and it is left to stand for at least 12 hours to form a one-side coating structure layer. The topcoat mixture contains 27wt% to 33wt% polyacrylate Dispersion, 3wt% to 5wt% polypropylene glycol, 0.5 to 1.5wt% preservative, 0.1wt% to 3wt% zinc oxide and 0.024wt% to 3wt% zinc pyrithione (ZPT, Zinc pyrithione), 38wt % to 42wt% of additives, and the balance of water; wherein, the additives include dispersants and adhesives.

S1~S3: steps

The upper and lower side photos of Fig. 1 are the appearances of the coatings of the comparative example and the embodiment of the present invention applied to the wall respectively.

Fig. 2 is a flowchart of the application method of the present invention.

The invention provides a building transparent waterproof coating structure to prevent solar decay, comprising two layers: the first layer is a primer structure layer, which is formed by applying a primer mixture on a wall, and the primer mixture contains 27wt % to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol, 2wt% to 3wt% cellulose, 0.5 to 1.5wt% preservative and the balance of water.

The second layer is the top coat structure layer, which is formed by applying a top coat mixture comprising 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol on the base coat structure layer , 0.5 to 1.5wt% of preservatives, 0.1wt% to 3wt% of zinc oxide (Zinc oxide) and 0.024wt% to 3wt% of zinc pyrithione (ZPT, Zinc pyrithione), 38wt% to 42wt% of dispersant or viscous agent or additive, and the balance of water.

The polyacrylate dispersion (Polyacrylate Dispersion) in the primer mixture is a dispersion of a copolymer of ethyl acrylate and methyl methacrylate in water. Its appearance is an opaque white viscous liquid, which can be used as an emulsifier. When it is added to the primer mixture, it can fill the pores and gaps on the wall more tightly by using its high penetration and high ductility characteristics, so it can completely fill the natural cracks on the wall or the gaps on the uneven surface, and also Make the primer mixture more obedient to the wall, and the paint film after the polyacrylate dispersion is dried and cured is strong, tough, elastic, with high gloss, good weather resistance, light resistance and excellent permeability. It can maintain the original appearance of the original stone or wall brick on the exterior wall of the building, and will not produce color difference or cover the original natural color.

The polypropylene glycol (Propylene Glycol) in the primer mixture is a kind of organic polymer, its general chemical formula is (C ₃ H ₆ O) _n , its color is colorless to light yellow, and its characteristics are non-volatile and non-corrosive viscous liquid. As a solvent in primer mixtures.

The cellulose in the primer mixture is a kind of organic compound, its general chemical formula is (C ₆ H ₁₀ O ₅ )n, it is insoluble in water, dilute acid and dilute alkali, and it is an organic solvent. Cellulose is the main component of plant cell walls. The cellulose content in cotton is close to 100%, which is the purest natural cellulose source. In general wood, cellulose accounts for 40-50%, and there are 10-30% hemicellulose and 20-30% lignin. In addition, hemp, wheat straw, rice bagasse, etc. are all rich sources of cellulose. Because cellulose contains a large amount of microfibers, mixing it in the primer can achieve good support and suture effects, so that when the primer is applied to the wall, it can have a grafting effect with the wall and make the primer The paint can be more completely and closely attached to the wall surface, and also achieve the effect of tensile and shock resistance of the primer coating. Furthermore, the fibers on the cellulose have strong grafting characteristics. At the same time, when the topcoat mixture is applied to the primer structure layer, the two will have a closer fit and strong mutual adhesion effect, and strengthen the interaction between the two structure layers. Bonding Adhesion.

The preservative is added to the primer mixture, so that the primer mixture is not easy to deteriorate and cause qualitative change, so the durability of the primer structure layer can be extended.

After the primer is completely dry, apply a layer of topcoat mixture on the primer structure layer. The polyacrylate dispersion in the topcoat mixture acts as a polymerization medium to make the outermost surface of the exterior wall anti-smog , Waterproof and shock-resistant characteristics, and make the primer structure layer remain flat and smooth after coating the top coat structure layer, so that the outermost paint film after drying and curing is strong, tough, elastic and has high gloss.

The polypropylene glycol (Propylene Glycol) in the topcoat mixture also acts as a solvent for the topcoat mixture.

0.024wt% of the preservatives in the topcoat mixture is benzisothiazolinone (BIT, Benzisothiazolinone), which is an antibacterial agent to prevent the topcoat mixture from being polluted by bacteria, mold or yeast, resulting in qualitative change and unable to Effectively maintain the quality and performance required by the original coating. Since the coating structure of the present invention is used in construction, it is necessary to consider the elements of long-term durability. Therefore, it is necessary to add an appropriate proportion of preservatives for antibacterial and anti-mildew treatment.

Zinc oxide (Zinc oxide) is an oxide of zinc, which is insoluble in water, soluble in acid and strong alkali, and has the function of physical sun protection. It can be added to the topcoat mixture to achieve anti-ultraviolet effect, so that the topcoat structure layer can be It is not easy to decompose and rot after years of exposure to the sun, and it has the protective effect of preventing the discoloration and cracking of the topcoat structure layer.

Zinc pyrithione (ZPT, Zinc Pyrithione) has extremely low solubility. In addition to making the topcoat mixture have anti-mold or anti-algae bactericidal properties, it decomposes slowly under ultraviolet light and can remain in direct sunlight for a long time. It maintains good efficacy over time and is also an excellent sunscreen.

The two layers of coatings in the transparent waterproof coating structure of the building that prevents sunlight decay in the present invention are both water-based materials, which improves the problem that the waterproof coating made of oily materials in the conventional technology cannot effectively resist ultraviolet rays. In addition to cracking in the sun, it is also prone to yellowing and discoloration, which affects the appearance and practicality of the building's exterior walls.

The two-layer coating structure of the present invention is milky white when it is just applied, and it is transparent and colorless after it is completely dried and formed. It can form a transparent elastic body with thickness and high gloss on the outer layer of the building wall surface, which has excellent tensile strength and It is impermeable, non-toxic, odorless, and non-corrosive, so it has the characteristics of beauty, support, anti-cracking, sun protection, waterproof, shock resistance, and anti-smog. Especially because of the addition of cellulose in the primer mixture, it has good adhesion to various substrates and makes the coating structure more durable.

In order to better understand the above content, the following specific implementations are provided to illustrate the content of the present invention.

Please refer to Fig. 2, the present invention also includes a kind of application method of the transparent waterproof coating structure of the building that prevents sunlight from decaying, and system comprises the following steps: Step S1: brush and wash or spray wash with high-pressure water first to a wall surface to be treated, remove Dust and dirt on the surface and gaps of the wall, and let it stand for at least three days to make the wall dry; Step S2: Apply the above-mentioned primer mixture evenly with a roller, hand brush or spray gun On the wall, let it stand for at least 5 hours to form a primer structure layer; Step S3: Apply the above-mentioned topcoat mixture to the primer structure layer evenly with a roller, hand brush or spray gun, and let it stand for at least 12 hours to form One side is coated with a structural layer.

See Table II below for the paints that were the primer mixtures for the following tests.

The building exterior wall of the present invention is applied with a two-layer coating structure, and a transparent elastic body with thickness and high gloss can be formed on the surface of the building wall, so that the original color and luster of the original stone or wall brick on the building wall can be maintained, and Due to the excellent tensile strength and impermeability of the coating material, it is non-toxic, odorless, and non-corrosive, and has the characteristics of supporting force, sun protection, cracking resistance, waterproof, shock resistance, and anti-smog. more because in Cellulose is added to the primer mixture, which has good adhesion to the topcoat structure layer, so it can be used more durable.

S1~S3: steps

Claims (10)

A building transparent waterproof coating structure for preventing sunlight decay, comprising: a primer structure layer formed by applying a primer mixture on a wall surface, the primer mixture comprising 27wt% to 33wt% polyacrylate Dispersion, 3wt% to 5wt% polypropylene glycol, 2wt% to 3wt% cellulose, 0.5 to 1.5wt% preservative and the rest of water; one side is coated with a structural layer, and the top coat mixture is applied to the base Formed on the paint structure layer, the topcoat mixture contains 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol, 0.5 to 1.5wt% preservative, 0.1wt% to 3wt% oxidation Zinc oxide and 0.024wt% to 3wt% of zinc pyrithione (ZPT, Zinc Pyrithione), 38wt% to 42wt% of additives, and the rest of water; wherein, the additives include dispersants and adhesives. The building transparent waterproof coating structure for preventing sunlight decay as described in claim 1, wherein the polyacrylate dispersion in the primer mixture and the topcoat mixture is a copolymer of ethyl acrylate and methyl methacrylate dispersion in water. The building transparent waterproof coating structure for preventing sunlight decay as described in Claim 1, wherein 0.024wt% of the 0.5 to 1.5wt% preservative in the topcoat mixture is benzisothiazolinone (BIT, Benzisothiazolinone). The building transparent waterproof coating structure for preventing sunlight decay as described in Claim 1, wherein the cellulose in the primer mixture is an organic compound, and its general chemical formula is (C ₆ H ₁₀ O ₅ ) _n . A method for constructing a transparent waterproof coating structure for preventing sunlight decay, comprising the following steps: Clean a wall first by brushing or spraying it with high-pressure water, and let it stand for at least three days to make the wall completely dry; apply a primer mixture evenly on the wall, and let it stand for at least 5 hours to form a base Paint structure layer, the primer mixture comprising 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% polypropylene glycol, 2wt% to 3wt% cellulose, 0.5 to 1.5wt% preservative and the balance water; apply the topcoat mixture evenly to the primer structure layer, and let it stand for at least 12 hours to form a topcoat structure layer. The topcoat mixture contains 27wt% to 33wt% polyacrylate dispersion, 3wt% to 5wt% % of polypropylene glycol, 0.5 to 1.5wt% of preservatives, 0.1wt% to 3wt% of zinc oxide and 0.024wt% to 3wt% of zinc pyrithione (ZPT, Zinc pyrithione), 38wt% to 42wt% of additives, And the rest of the water; wherein, the additive includes a dispersant and a viscous agent. The application method as described in claim 5, wherein the primer mixture is evenly applied to the wall by rolling, brushing or spraying. The application method as described in claim 5, wherein the topcoat mixture is evenly applied to the primer structure layer by roller, hand brush or spray gun spraying. The application method as described in claim 5, wherein the polyacrylate dispersion in the primer mixture and the topcoat mixture is a dispersion of a copolymer of ethyl acrylate and methyl methacrylate in water. The application method as described in Claim 5, wherein 0.024wt% of the 0.5 to 1.5wt% preservative in the topcoat mixture is benzisothiazolinone (BIT, Benzisothiazolinone). The application method according to claim 5, wherein the cellulose in the primer mixture is an organic compound with a general chemical formula of (C ₆ H ₁₀ O ₅ ) _n .

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