Oily environment-friendly polymer anticorrosive waterproof coating and preparation method thereof

Abstract

The invention provides an oily environment-friendly polymer anticorrosive waterproof coating and a preparation method thereof, and belongs to the technical field of coating compositions. The invention relates to an oily environment-friendly high-molecular anticorrosive waterproof coating which is prepared from the following raw materials in parts by weight: 5-20 parts of SEPS, 1-15 parts of polyisobutene, 3-15 parts of terpene resin, 1-12 parts of poly-alpha-methylstyrene resin, 2-10 parts of A81 resin, 7-50 parts of inorganic filler, 0.1-2 parts of a defoaming agent, 0.1-2 parts of an anti-aging agent, 0.1-2 parts of an ultraviolet light absorber, 0.1-1 part of a light blocking agent, 25-70 parts of an environment-friendly solvent and 0-1 part of perfume. The oily environment-friendly high-molecular anticorrosive waterproof coating is waterproof, corrosion-resistant, environment-friendly, convenient to construct and suitable for surface protection of color steel tiles and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of coating compositions, and in particular relates to an oily, environment-friendly polymer anticorrosive and waterproof coating and a preparation method thereof. Background Art

[0002] Color steel tiles are a lightweight, high-strength, and corrosion-resistant building material that is widely used in industrial plants, warehouses, and other buildings. However, their metal substrates (galvanized steel plates or aluminum-zinc alloy steel plates) have significant shortcomings after long-term exposure: (1) The coating has poor timeliness: The thickness of the galvanized layer is usually only 20-30μm, and it is prone to aging and failure under the erosion of ultraviolet rays, acid rain, salt spray, etc., resulting in rust and perforation of the substrate; (2) Thermal expansion and contraction cause structural damage: The joints deform and crack due to temperature changes, which accelerates the risk of leakage and threatens the safety of equipment inside the building; (3) High maintenance costs: The lifespan of traditional color steel tiles is only 8-15 years, and the cost of replacement after rusting is 3-5 times that of preventive painting. Therefore, color steel tiles are generally coated with paint to extend their service life. However, the performance of different coatings varies greatly. In the prior art, there are many types of color steel tile coatings, and their performances are also different. For example, patent application document CN108017965A discloses a method for preparing color steel tile coatings, which includes the following steps: after cleaning the surface of the color steel tile, spray the surface with a modifying liquid; after heating the asphalt to 170-180°C, add basalt fiber and polycaprolactam powder to it and mix evenly, add the mixture to a high-speed shearing instrument for high-temperature off-speed shearing to obtain a heat insulation additive; after methacrylic acid, diglycidyl adipate, diglycidyl dimer linoleate, octadecyl methacrylate, and potassium persulfate are mixed evenly, heated for reaction, and a copolymer emulsion is obtained; after the copolymer emulsion, heat insulation additive, N-octyl diaminoethyl glycine hydrochloride, triisopropoxy aluminum, and isopropoxy distearic acid acyloxy aluminum ester are mixed evenly, a color steel tile coating is obtained. The color steel tile coating has waterproof and corrosion-resistant effects. However, the coating uses asphalt as one of its main raw materials. Although it is low-cost, it exposes the following defects in high-temperature environments: asphalt is not heat-resistant. When the temperature exceeds 60°C, the thermal motion of the asphalt molecular chain intensifies, which may cause the viscosity of the coating to decrease and weaken the waterproof function; the aromatic components in the asphalt undergo photo-oxidation reactions under ultraviolet rays, which may cause the coating to powder and crack, shortening its life; and asphalt will volatilize toxic gases such as benzene at high temperatures, which is environmentally friendly.

[0003] Compared with the technology disclosed in the above-mentioned documents, water-based coatings are more environmentally friendly and can avoid the problem of high-temperature denaturation. For example, the patent application document CN101747834A discloses a one-component water-based silicone rubber waterproof coating, which is prepared from silicone-acrylate emulsion, waterproofing agent, film-forming aid, flame retardant, wollastonite, calcium carbonate, thickener, and defoaming agent. This coating is a one-component water-based coating and can be used for long-term coating protection of color steel tiles. However, the low-temperature construction of water-based coatings has the following limitations: when the ambient temperature is lower than 5°C, the evaporation rate of water drops sharply, resulting in a prolonged surface drying time of the coating, and the integrity of the paint film is easily damaged by dew or frost; the movement of resin molecular segments is restricted at low temperatures, and the bonding strength between the coating and the substrate is significantly reduced, which is easy to fall off and fail; it is also necessary to avoid the low temperature periods in the morning and evening, which compresses the effective construction time per day and affects the progress of the project.

[0004] Therefore, the existing color steel tile waterproof coatings still have shortcomings in many aspects. It is important and necessary to develop color steel tile coatings that are waterproof, corrosion-resistant, easy to construct and environmentally friendly. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an oily environmentally friendly polymer coating that is waterproof, corrosion-resistant, environmentally friendly and easy to construct.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: an oily environmentally friendly polymer anticorrosive and waterproof coating, made of the following raw materials in parts by weight: SEPS 5-20 parts, polyisobutylene 1-15 parts, terpene resin 3-15 parts, poly α-methylstyrene resin 1-12 parts, A81 resin 2-10 parts, inorganic filler 7-50 parts, defoaming agent 0.1-2 parts, antioxidant 0.1-2 parts, ultraviolet absorber 0.1-2 parts, light blocker 0.1-1 parts, environmentally friendly solvent 25-70 parts, and fragrance 0-1 part.

[0007] Optionally, the inorganic filler is a combination of two or more of mica powder, titanium dioxide, mica iron oxide ash, nano-silicon dioxide and nano-titanium dioxide, preferably a combination of mica powder, titanium dioxide, mica iron oxide ash, nano-silicon dioxide and nano-titanium dioxide, wherein the weight parts of each raw material are as follows: 5-20 parts of mica powder, 1-8 parts of titanium dioxide, 1-8 parts of mica iron oxide ash, 0.5-5 parts of nano-silicon dioxide, and 0.1-3 parts of nano-titanium dioxide.

[0008] Optionally, the defoamer is at least one of a polyether-modified silicon defoamer and a polyether defoamer.

[0009] Optionally, the antioxidant includes antioxidant I and antioxidant II, wherein the antioxidant I and antioxidant II are selected from hindered phenol antioxidants or phosphite antioxidants, respectively, and the mass ratio of the antioxidant I to the antioxidant II is (0.1-1): (0.1-0.5). The hindered phenol antioxidant can be selected from 2,6-di-tert-butyl-p-cresol (BHT) or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, and the phosphite antioxidant can be selected from tris(2,4-di-tert-butylphenyl) phosphite or distearyl pentaerythritol diphosphite.

[0010] Optionally, the ultraviolet absorber includes ultraviolet absorber I and ultraviolet absorber II, and the ultraviolet absorber I and ultraviolet absorber II are respectively selected from benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers or triazine ultraviolet absorbers, and the mass ratio of ultraviolet absorber I to ultraviolet absorber II is (0.1-1.2):(0.1-0.8). Benzotriazole UV absorbers can choose UV-P (2-(2'-hydroxy-5'-methylphenyl)benzotriazole) or UV-327 (2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole), benzophenone UV absorbers can choose UV-9 (2-hydroxy-4-methoxybenzophenone) or UV-531 (2-hydroxy-4-n-octyloxybenzophenone), and triazine UV absorbers can choose UV-360 (2,2'-methylene-bis(6-benzotriazole-4-tert-octylphenylphenol)).

[0011] Optionally, the light-blocking agent is kaolin or barium sulfate.

[0012] Optionally, the environmentally friendly solvent includes environmentally friendly solvent I and environmentally friendly solvent II, and the environmentally friendly solvent I and environmentally friendly solvent II are respectively selected from ester solvents, and the ester solvent can be selected from isopropyl acetate, ethyl acetate, n-butyl acetate, ethyl lactate, acetyl citrate triethyl or propylene glycol methyl ether acetate, and the mass ratio of the environmentally friendly solvent I to the environmentally friendly solvent II is (15-40): (10-30).

[0013] Optionally, the weight portion of the fragrance is 0.1-1 part, and the fragrance is at least one of limonene, linalool, menthol, benzyl acetate and γ-nonalactone.

[0014] Optionally, the oily, environment-friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 5-20 parts of SEPS, 1-15 parts of polyisobutylene, 3-15 parts of terpene resin, 1-12 parts of poly-α-methylstyrene resin, 2-10 parts of A81 resin, 5-20 parts of mica powder, 1-8 parts of titanium dioxide, 1-8 parts of mica iron oxide ash, 0.5-5 parts of nano-silicon dioxide, 0.1-3 parts of nano-titanium dioxide, 0.1-2 parts of defoaming agent, 0.1-1 parts of antioxidant I, 0.1-0.5 parts of antioxidant II, 0.1-1.2 parts of ultraviolet absorber I, 0.1-0.8 parts of ultraviolet absorber II, 0.1-1 parts of light-blocking agent, 15-40 parts of environmentally friendly solvent I, 10-30 parts of environmentally friendly solvent II, and 0-1 parts of fragrance.

[0015] The present invention also provides a method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating, comprising the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 60-80° C. to obtain a matrix; cooling to below 50° C., adding an inorganic filler, a defoaming agent, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention achieves comprehensive properties such as waterproofing, corrosion resistance, and aging resistance through the complementary functions of multiple resin matrices, the multi-dimensional protection of the auxiliary agent system, and the balance of environmentally friendly solvents.

[0017] The coating matrix of the present invention adopts SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin and A81 resin to cooperate with each other, wherein: SEPS (styrene-ethylene / propylene-styrene block copolymer), as a base resin, provides flexibility, film-forming properties and mechanical strength; the styrene chain segment enhances adhesion, and the ethylene-propylene chain segment imparts water resistance and elasticity. At the same time, it does not contain polar groups, has good solubility in environmentally friendly solvents, and has high compatibility with polyisobutylene, which can form a dense waterproof film layer to improve waterproof performance. Polyisobutylene, as a tackifier, improves the flexibility and low-temperature performance of the coating, and synergizes with SEPS to enhance waterproof sealing. Terpene resin, as a tackifier resin, improves the wettability and initial adhesion of the coating to the substrate; and cooperates with polyisobutylene to form a hydrogen bond network to improve the adhesion of the coating to the color steel tile substrate; at the same time, the hydrophobicity of the terpene resin and the chemical inertness of polyisobutylene synergize to make the coating resistant to acid and alkali corrosion. Poly-α-methylstyrene resin improves the thermal stability and UV aging resistance of the coating through the rigid benzene ring structure, and compounding with terpene resin can optimize the bonding durability. A81 resin (aldehyde resin) increases the cross-linking density of the coating through intermolecular hydrogen bonds, thereby increasing the hardness of the coating while maintaining flexibility, preventing the coating from cracking in a wide temperature range and enhancing weather resistance. Therefore, the above-mentioned matrix raw materials cooperate with each other to lay the foundation for the coating to obtain excellent waterproof and corrosion-resistant properties.

[0018] At the same time, the coating of the present invention is preferably combined with inorganic fillers, defoamers, antioxidants, ultraviolet absorbers, light-blocking agents, environmentally friendly solvents and fragrances on the basis of the base to further enhance the waterproof and corrosion-resistant properties of the coating. Among them: Inorganic fillers, preferably mica powder, titanium dioxide, mica iron oxide ash, nano-silicon dioxide and nano-titanium dioxide, are used to adjust the rheology and combine with various filler types to block the passage of water vapor and enhance the corrosion resistance and adhesion of the coating. Defoamers inhibit the generation of bubbles during construction, avoid pinhole defects in the coating, and improve the density of the coating. Anti-aging agents, ultraviolet absorbers and light-blocking agents work together. Anti-aging agents capture free radicals and delay oxidative degradation. Ultraviolet absorbers convert light energy and light-blocking agents reflect UV. The three together resist photothermal oxidation and improve the aging resistance and temperature change resistance of the coating.

[0019] After testing, the coating obtained by the present invention has an adhesion of 0~1 level, a neutral salt spray resistance of 0 level, an aging resistance of 0~1 level, qualified acid resistance, alkali resistance and temperature change resistance, qualified waterproofness, no volatile organic compounds, significant comprehensive performance, and meets environmental protection requirements. DETAILED DESCRIPTION

[0020] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0021] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0022] Unless otherwise specified, all raw materials are from commercially available products and do not contain other unspecified components except inevitable impurities unless otherwise specified.

[0023] In the following embodiments, an oily environmentally friendly polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 5-20 parts of SEPS, 1-15 parts of polyisobutylene, 3-15 parts of terpene resin, 1-12 parts of poly-α-methylstyrene resin, 2-10 parts of A81 resin, 5-20 parts of mica powder, 1-8 parts of titanium dioxide, 1-8 parts of mica iron oxide ash, 0.5-5 parts of nano silicon dioxide, 0.1-3 parts of nano titanium dioxide, 0.1-2 parts of defoaming agent, 0.1-1 parts of antioxidant I, 0.1-0.5 parts of antioxidant II, 0.1-1.2 parts of ultraviolet absorber I, 0.1-0.8 parts of ultraviolet absorber II, 0.1-1 parts of light blocking agent, 15-40 parts of environmentally friendly solvent I, 10-30 parts of environmentally friendly solvent II, and 0-1 parts of fragrance.

[0024] The defoamer is at least one of a polyether-modified silicon defoamer and a polyether defoamer.

[0025] Antioxidant I and antioxidant II are selected from hindered phenol antioxidants or phosphite antioxidants respectively. The hindered phenol antioxidant can be selected from 2,6-di-tert-butyl-p-cresol (BHT) or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], and the phosphite antioxidant can be selected from tris(2,4-di-tert-butylphenyl) phosphite or distearyl pentaerythritol diphosphite.

[0026] The ultraviolet absorber I and the ultraviolet absorber II are selected from benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers or triazine ultraviolet absorbers respectively. The benzotriazole ultraviolet absorber can select UV-P (2-(2'-hydroxy-5'-methylphenyl)benzotriazole) or UV-327 (2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole), the benzophenone ultraviolet absorber can select UV-9 (2-hydroxy-4-methoxybenzophenone) or UV-531 (2-hydroxy-4-n-octyloxybenzophenone), and the triazine ultraviolet absorber can select UV-360 (2,2'-methylene-bis(6-benzotriazole-4-tert-octylphenylphenol)).

[0027] The light-blocking agent is kaolin or barium sulfate.

[0028] The environmentally friendly solvent I and the environmentally friendly solvent II are respectively selected from ester solvents, and the ester solvents can be selected from isopropyl acetate, ethyl acetate, n-butyl acetate, ethyl lactate, triethyl acetyl citrate or propylene glycol methyl ether acetate.

[0029] The weight proportion of the fragrance is 0.1-1 part, and the fragrance is at least one of limonene, linalool, menthol, benzyl acetate and γ-nonalactone. The following is a specific implementation scheme of an oily environmentally friendly polymer anticorrosive and waterproof coating of the present invention.

[0030] Example 1: An oily, environmentally friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 8 parts of SEPS, 5 parts of polyisobutylene, 9 parts of terpene resin, 6 parts of poly-α-methylstyrene resin, 5 parts of A81 resin, 12 parts of mica powder, 5 parts of titanium dioxide, 3 parts of mica iron oxide ash, 3 parts of nano-silicon dioxide, 1.6 parts of nano-titanium dioxide, 1.3 parts of polyether modified silicon defoamer, 0.5 parts of 2,6-di-tert-butyl-p-cresol, 0.2 parts of tris(2,4-di-tert-butylphenyl) phosphite, 0.8 parts of UV-P, 0.5 parts of UV-531, 0.5 parts of kaolin, 20 parts of isopropyl acetate, 25 parts of ethyl acetate, and 0.2 parts of limonene.

[0031] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 72°C to obtain a matrix; cooling to 50°C, adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0032] Example 2: An oily, environmentally friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 10 parts of SEPS, 3 parts of polyisobutylene, 3 parts of terpene resin, 7 parts of poly-α-methylstyrene resin, 8 parts of A81 resin, 10 parts of mica powder, 4 parts of titanium dioxide, 4 parts of mica iron oxide ash, 2 parts of nano-silicon dioxide, 1.8 parts of nano-titanium dioxide, 1.2 parts of polyether-modified silicon defoamer, 0.3 parts of 2,6-di-tert-butyl-p-cresol, 0.1-0.5 parts of pentaerythritol distearyl diphosphite, 0.7 parts of UV-327, 0.8 parts of UV-9, 0.7 parts of kaolin, 15 parts of isopropyl acetate, 20 parts of n-butyl acetate, and 0.1 parts of linalool.

[0033] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 75°C to obtain a matrix; cooling to 50°C, adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0034] Example 3: An oily, environmentally friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 12 parts of SEPS, 10 parts of polyisobutylene, 5 parts of terpene resin, 5 parts of poly-α-methylstyrene resin, 6 parts of A81 resin, 12 parts of mica powder, 3 parts of titanium dioxide, 5 parts of mica iron oxide ash, 4 parts of nano-silicon dioxide, 2.1 parts of nano-titanium dioxide, 0.5 parts of polyether-modified silicon defoamer, 0.6 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.2 parts of tris(2,4-di-tert-butylphenyl) phosphite, 0.1 parts of UV-327, 0.8 parts of UV-360, 0.5 parts of kaolin, 20 parts of isopropyl acetate, 15 parts of ethyl lactate, and 0.3 parts of menthol.

[0035] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 80° C. to obtain a matrix; cooling to 50° C., adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0036] Example 4: An oily, environmentally friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 15 parts of SEPS, 8 parts of polyisobutylene, 7 parts of terpene resin, 10 parts of poly-α-methylstyrene resin, 10 parts of A81 resin, 8 parts of mica powder, 6 parts of titanium dioxide, 7 parts of mica iron oxide ash, 5 parts of nano-silicon dioxide, 2.5 parts of nano-titanium dioxide, 0.8 parts of polyether-modified silicon defoamer, 0.1 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.5 parts of distearyl pentaerythritol diphosphite, 1.2 parts of UV-9Ⅰ, 0.1 parts of UV-360, 0.3 parts of kaolin, 30 parts of isopropyl acetate, 100 parts of triethyl acetylcitrate, and 0.5 parts of benzyl acetate.

[0037] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 60° C. to obtain a matrix; cooling to 48° C., adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0038] Example 5: An oily, environmentally friendly, polymer anticorrosive and waterproof coating is made of the following raw materials in parts by weight: 5 parts of SEPS, 15 parts of polyisobutylene, 10 parts of terpene resin, 12 parts of poly-α-methylstyrene resin, 10 parts of A81 resin, 12 parts of mica powder, 8 parts of titanium dioxide, 5 parts of mica iron oxide ash, 0.5 parts of nano-silicon dioxide, 3 parts of nano-titanium dioxide, 0.1 parts of polyether defoamer, 0.7 parts of 2,6-di-tert-butyl-p-cresol, 0.1 parts of tris(2,4-di-tert-butylphenyl) phosphite, 0.2 parts of UV-P, 0.6 parts of UV-531, 0.1 parts of barium sulfate, 35 parts of ethyl acetate, 10 parts of propylene glycol methyl ether acetate and 1 part of menthol.

[0039] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 65° C. to obtain a matrix; cooling to 50° C., adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0040] Example 6: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 20 parts of SEPS, 1 part of polyisobutylene, 12 parts of terpene resin, 1 part of poly-α-methylstyrene resin, 2 parts of A81 resin, 20 parts of mica powder, 7 parts of titanium dioxide, 8 parts of mica iron oxide ash, 1.5 parts of nano-silicon dioxide, 0.5 parts of nano-titanium dioxide, 2 parts of polyether defoamer, 1 part of 2,6-di-tert-butyl-p-cresol, 0.1 part of distearyl pentaerythritol diphosphite, 0.5 parts of UV-327, 0.6 parts of UV-9, 0.3 parts of barium sulfate, 15 parts of n-butyl acetate, 30 parts of ethyl lactate, and 0.4 parts of benzyl acetate.

[0041] A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 70°C to obtain a matrix; cooling to 50°C, adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance to the matrix in sequence, stirring, and standing to obtain a product.

[0042] The preparation methods of the oily environmentally friendly polymer anticorrosive and waterproof coatings in the following Examples 7-11 all refer to Example 1, and the corresponding raw materials involved shall be subject to the specific records of the corresponding examples.

[0043] Example 7: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 16 parts of SEPS, 4 parts of polyisobutylene, 13 parts of terpene resin, 3 parts of poly-α-methylstyrene resin, 4 parts of A81 resin, 5 parts of mica powder, 1 part of titanium dioxide, 1 part of mica iron oxide ash, 2 parts of nano-silicon dioxide, 0.1 parts of nano-titanium dioxide, 1.7 parts of polyether defoamer, 0.6 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, 0.2 parts of tris(2,4-di-tert-butylphenyl) phosphite, 0.9 parts of UV-P, 0.6 parts of UV-360, 1 part of barium sulfate, 40 parts of isopropyl acetate, 10 parts of ethyl acetate, and 0.6 parts of γ-nonalactone.

[0044] Example 8: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 18 parts of SEPS, 13 parts of polyisobutylene, 6 parts of terpene resin, 4 parts of poly-α-methylstyrene resin, 3 parts of A81 resin, 16 parts of mica powder, 2 parts of titanium dioxide, 2 parts of mica iron oxide ash, 3 parts of nano-silicon dioxide, 0.3 parts of nano-titanium dioxide, 1.5 parts of polyether defoamer, 0.5 parts of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 0.3 parts of pentaerythritol distearyl diphosphite, 1.0 parts of UV-327, 0.3 parts of UV-360, 0.9 parts of barium sulfate, 26 parts of triethyl acetylcitrate, 200 parts of n-butyl acetate, and 0.8 parts of limonene.

[0045] Example 9: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 13 parts of SEPS, 12 parts of polyisobutylene, 15 parts of terpene resin, 12 parts of poly-α-methylstyrene resin, 8 parts of A81 resin, 18 parts of mica powder, 3 parts of titanium dioxide, 3 parts of mica iron oxide ash, 2.5 parts of nano-silicon dioxide, 2.3 parts of nano-titanium dioxide, 0.7 parts of polyether modified silicon defoamer, 2 parts of 2,6-di-tert-butyl-p-cresol, 2 parts of UV-P, 1 part of kaolin, and 50 parts of isopropyl acetate.

[0046] Example 10: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 15 parts of SEPS, 10 parts of polyisobutylene, 8 parts of terpene resin, 10 parts of poly-α-methylstyrene resin, 9 parts of A81 resin, 15 parts of mica powder, 4 parts of titanium dioxide, 7 parts of mica iron oxide ash, 3 parts of nano-silicon dioxide, 2.5 parts of nano-titanium dioxide, 0.5 parts of polyether modified silicon defoamer, 1.5 parts of tris(2,4-di-tert-butylphenyl) phosphite, 1.6 parts of UV-531, 1 part of barium sulfate, 55 parts of ethyl acetate, and 0.5 parts of menthol.

[0047] Example 11: An oily, environmentally friendly, polymer anticorrosive and waterproof coating, made from the following raw materials in parts by weight: 7 parts of SEPS, 11 parts of polyisobutylene, 7 parts of terpene resin, 9 parts of poly-α-methylstyrene resin, 10 parts of A81 resin, 12 parts of mica powder, 5 parts of titanium dioxide, 6 parts of mica iron oxide ash, 4 parts of nano-silicon dioxide, 3 parts of nano-titanium dioxide, 1.1 parts of polyether defoamer, 0.6 parts of pentaerythritol distearyl diphosphite, 0.5 parts of tris(2,4-di-tert-butylphenyl) phosphite, 1.5 parts of UV-9, 1 part of kaolin, 45 parts of isopropyl acetate, and 0.6 parts of γ-nonalactone.

[0048] The following is a comparative implementation scheme.

[0049] Comparative Example 1: A color steel tile coating, which is different from Example 1 in that polyisobutylene is omitted.

[0050] Comparative Example 2: A color steel tile coating, which is different from Example 2 in that the poly-α-methylstyrene resin is omitted.

[0051] Comparative Example 3: A color steel tile coating, which is different from Example 3 in that the A81 resin is omitted.

[0052] Comparative Example 4: A color steel tile coating, which is different from Example 4 in that C5 petroleum resin is used instead of terpene resin, and the other raw materials and weight parts remain unchanged.

[0053] Comparative Example 5: A color steel tile coating, which is different from Example 5 in that the weight portion of the terpene resin is 1 part.

[0054] Comparative Example 6: A color steel tile coating, which is different from Example 9 in that the weight portions of 2,6-di-tert-butyl-p-cresol, UV-P and kaolin are 3 parts, 0.5 parts and 1.5 parts respectively, and the other raw materials and weight portions remain unchanged.

[0055] Comparative Example 7: A color steel tile coating, which is different from Example 10 in that the inorganic filler in Example 1 is replaced by the following raw material combination in parts by weight: 15 parts of mica powder and 3 parts of nano silicon dioxide.

[0056] Next, the coatings prepared in Examples 1-5, Examples 9-10 and Comparative Examples 1-7 were evaluated for performance. Under room temperature, the coatings prepared in Examples 1-5, Examples 9-10 and Comparative Examples 1-7 were sampled and coated on treated steel plates with a thickness of 0.7 mm. The specimen size was prepared in accordance with the relevant test standards. The curing environment temperature was (23±2)°C, the humidity was (50±10)%, and the thickness of the dry coating film after curing was 50±5 microns. The specimens were prepared for testing, and 3 parallel samples were prepared for each group of samples.

[0057] (1) Adhesion test and rating: Test and rating shall be carried out according to the method specified in GB / T9286-2021 "Scratch test for paints and varnishes".

[0058] (2) Acid resistance test: According to the method specified in GB / T 9274-1988 "Test Procedure - Method A (Immersion Method)", the test piece is immersed in 5% H2SO4 solution for 720 hours. If there is no cracking, blistering, rusting or peeling of the coating, it is evaluated as qualified in acid resistance. Otherwise, it is evaluated as unqualified and the unqualified items are recorded.

[0059] (3) Alkali resistance test: According to the method specified in GB / T 9274-1988 "Test Procedure - Method A (Immersion Method)", the test piece is immersed in 5% NaOH solution for 720 hours. If there is no cracking, blistering, rusting or peeling of the coating, it is evaluated as qualified in alkali resistance. Otherwise, it is evaluated as unqualified and the unqualified items are recorded.

[0060] (4) Neutral salt spray resistance test: The test is carried out according to the method specified in GB / T10125-2021 "Neutral salt spray test". The results are evaluated for the comprehensive aging performance grade with reference to GB / T1766-2008 "Rating method for aging of paint and varnish coatings".

[0061] (5) Aging resistance test: The test shall be carried out in accordance with the method specified in GB / T1865-2009 "Artificial weathering and artificial radiation exposure of paints and varnishes to filtered xenon arc radiation". The results shall be evaluated for comprehensive aging performance level in accordance with GB / T1766-2008 "Rating method for aging of paints and varnishes".

[0062] (6) Temperature change resistance test: The test is carried out according to the method specified in JG / T 25-2017 "Test method for temperature change resistance of architectural coatings". The test specimens are observed for powdering, cracking, flaking, blistering and discoloration. In each group of tests, all specimens are qualified if they do not show powdering, cracking, flaking, blistering, discoloration or gloss loss. Otherwise, they are unqualified.

[0063] (7) Waterproofness test: Test according to "15 Waterproofness" specified in GB / T 16777-2008 "Test methods for building waterproof coatings", with a test pressure of 0.3 MPa and a test time of 30 min. All test pieces are qualified if there is no water permeability.

[0064] (8) Environmental performance: Test the VOC content according to the method specified in GB / T 23985-2009 "Paints and varnishes - Determination of volatile organic compound (VOC) content - Difference method" to determine whether the VOC content of the product meets the technical requirements of GB / T 38597-2020 for low volatile organic compound content coatings, which is ≤50g / L.

[0065] The test results of various properties of the coatings obtained in Examples 1-5, Examples 9-10 and Comparative Examples 1-7 of the present invention are listed in Table 1 and Table 2, respectively.

[0066] Table 1 Test results of coating properties of Examples 1-5 and 9-10 The above results show that the coating obtained by the present invention has an adhesion of 0~1 level, a neutral salt spray resistance of 0 level, an aging resistance of 0~1 level, qualified acid resistance, alkali resistance and temperature change resistance, qualified waterproofness, no volatile organic compounds, outstanding comprehensive performance, and meets environmental protection requirements.

[0067] Table 2 Comparative Examples 1-7 Coating Performance Test Results The above results show that in Comparative Example 1, polyisobutylene is omitted, and the adhesion, neutral smoke resistance and aging resistance of the coating are reduced, the waterproofness is obviously unqualified, and there is water seepage; in Comparative Example 2, poly-α-methylstyrene resin is omitted, and the adhesion and aging resistance of the coating are significantly reduced; in Comparative Example 3, A81 resin is omitted, the neutral salt spray resistance and aging resistance of the coating are significantly reduced, the temperature change resistance is unqualified, and there is powdering; in Comparative Example 4, C5 petroleum resin is used to replace terpene resin, and the corrosion resistance of the coating is significantly changed, and it is obviously not resistant to acid, alkali and salt corrosion, and there is cracking, indicating that the above raw materials play different roles in the coating system and cannot be directly replaced; in Comparative Example 5, the amount of terpene resin is reduced, the corrosion resistance is significantly reduced, and there is cracking; in Comparative Example 6, the ratio of some raw materials is changed, and the aging resistance and temperature change resistance of the coating are significantly deteriorated; in Comparative Example 7, the use of some inorganic fillers is omitted, and the adhesion and aging resistance of the coating are significantly deteriorated.

[0068] It can be seen that the coating of the present invention synergistically enhances the waterproofness, corrosion resistance and aging resistance through the reasonable combination of multiple raw materials. It is safe and environmentally friendly to use. As a coating for color steel tiles, it can play a significant protective role on color steel tiles and has obvious practical value for promotion.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An oily environmentally friendly polymer anticorrosion and waterproof coating, characterized by: The invention is prepared from the following raw materials in parts by weight: 5-20 parts of SEPS, 1-15 parts of polyisobutylene, 3-15 parts of terpene resin, 1-12 parts of poly-α-methylstyrene resin, 2-10 parts of A81 resin, 7-50 parts of inorganic filler, 0.1-2 parts of defoaming agent, 0.1-2 parts of antioxidant, 0.1-2 parts of ultraviolet absorber, 0.1-1 parts of light blocking agent, 25-70 parts of environmentally friendly solvent and 0-1 parts of fragrance.

2. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 1, characterized in that: The inorganic filler is a combination of two or more of mica powder, titanium dioxide, mica iron oxide ash, nano silicon dioxide and nano titanium dioxide.

3. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 2, characterized in that: The defoamer is at least one of a polyether-modified silicon defoamer and a polyether defoamer.

4. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 3, characterized in that: The antioxidant includes antioxidant I and antioxidant II, wherein the antioxidant I and antioxidant II are hindered phenol antioxidants or phosphite antioxidants, respectively, and the mass ratio of the antioxidant I to the antioxidant II is (0.1-1): (0.1-0.5).

5. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 4, characterized in that: The ultraviolet absorber comprises ultraviolet absorber I and ultraviolet absorber II, wherein the ultraviolet absorber I and ultraviolet absorber II are selected from benzotriazole ultraviolet absorbers, benzophenone ultraviolet absorbers or triazine ultraviolet absorbers respectively, and the mass ratio of the ultraviolet absorber I to the ultraviolet absorber II is (0.1-1.2):(0.1-0.8).

6. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 5, characterized in that: The light-blocking agent is kaolin or barium sulfate.

7. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 6, characterized in that: The environmentally friendly solvent includes environmentally friendly solvent I and environmentally friendly solvent II, and the environmentally friendly solvent I and environmentally friendly solvent II are respectively selected from ester solvents, and the mass ratio of the environmentally friendly solvent I to the environmentally friendly solvent II is (15-40): (10-30).

8. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 7, characterized in that: The weight proportion of the fragrance is 0.1-1 part, and the fragrance is at least one of limonene, linalool, menthol, benzyl acetate and γ-nonalactone.

9. The oily environmentally friendly polymer anticorrosive and waterproof coating according to claim 8, characterized in that: The invention is prepared from the following raw materials in parts by weight: 5-20 parts of SEPS, 1-15 parts of polyisobutylene, 3-15 parts of terpene resin, 1-12 parts of poly-α-methylstyrene resin, 2-10 parts of A81 resin, 5-20 parts of mica powder, 1-8 parts of titanium dioxide, 1-8 parts of mica iron oxide ash, 0.5-5 parts of nano silicon dioxide, 0.1-3 parts of nano titanium dioxide, 0.1-2 parts of defoaming agent, 0.1-1 parts of antioxidant I, 0.1-0.5 parts of antioxidant II, 0.1-1.2 parts of ultraviolet absorber I, 0.1-0.8 parts of ultraviolet absorber II, 0.1-1 parts of light blocking agent, 15-40 parts of environmentally friendly solvent I, 10-30 parts of environmentally friendly solvent II and 0-1 parts of fragrance.

10. A method for preparing an oily environmentally friendly polymer anticorrosive and waterproof coating according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing SEPS, polyisobutylene, terpene resin, poly-α-methylstyrene resin, A81 resin and an environmentally friendly solvent, stirring and dissolving at 60-80° C. to obtain a matrix; cooling to below 50° C., sequentially adding an inorganic filler, a defoamer, an antioxidant, an ultraviolet absorber, a light-blocking agent and a fragrance into the matrix, stirring, standing, and obtaining a product.

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