High-adhesion elastic weather-resistant coating, and preparation method and application thereof

Abstract

The application discloses a kind of high bonding elastic weather-resistant coatings and its preparation method and application, it is related to high molecular coating technical field, it includes main agent and curing agent, the mass ratio of main agent and curing agent is 1:0.5~1;Main agent includes 30~60 parts of aliphatic resin, 0~10 parts of chain extender, 15~40 parts of powder, 0.1~1 parts of pigment, 2~6 parts of finish coat auxiliary agent and 0~10 parts of organic solvent by mass fraction;Curing agent includes 40~75 parts of linear flexible resin, 20~50 parts of diisocyanate, 5~20 parts of solvent, 0~6 parts of latent curing agent, 0~0.1 parts of stabilizer, 0.01~0.05 parts of drier by mass fraction.The coating forms high bonding with concrete base, has corrosion resistance and ultraviolet aging resistance, excellent waterproof anticorrosion effect, with good elasticity, flexibility and weather resistance at the same time.Construction is simple and fast, does not affect high-speed rail normal operation, solid content is high, environmental protection is safe.Preparation method is simple and easy to operate, suitable for large-scale industrial production, realizes excellent performance coating and preparation method.

Description

Technical Field

[0001] This invention belongs to the field of polymer coating technology, specifically relating to a high-adhesion elastic weather-resistant coating, its preparation method, and its application. Background Technology

[0002] High-speed railways primarily use concrete for their roadbeds. To ensure the durability and safety of the railway roadbed, it is often necessary to apply protective coatings to the concrete roadbed. However, due to the impacts and vibrations that occur during the operation of high-speed railways, coupled with the inherent material properties of concrete, even with protective coatings, the coatings are easily damaged.

[0003] Currently, the most common waterproof and anti-corrosion coatings used on high-speed railway concrete surfaces are sprayed polyurea waterproof coatings, chlorinated polyethylene membranes, polymer-modified bitumen membranes, and two-component polyurethane waterproof coatings. However, these products cannot simultaneously guarantee both weather resistance and adhesion. After prolonged exposure to natural environmental erosion and the high-frequency vibrations of high-speed trains, the protective coatings exhibit cracking and large-scale peeling, resulting in waterproofing failure. Damage and detachment of the protective coating cause waterproofing failure on high-speed railway bridge decks, affecting the bridge's service life. The detached protective coating also poses a safety hazard to train operation. After several or even more than a decade, the protective coatings on some high-speed railway bridge decks, beams, beam ends, and piers have commonly shown signs of damage, concrete deterioration, exposed rebar and rust, and loose, non-dense concrete, leading to a decline in the overall durability of the high-speed railway structure. Furthermore, the long distances spanned by high-speed railway lines and the complex natural environment and climate can potentially cause partial concrete powdering or even cracking, and rebar rusting. Therefore, the actual conditions of high-speed railway concrete substrates place high demands on the corrosion resistance, high adhesion, and weather resistance of protective coatings; furthermore, they place higher demands on performance in terms of waterproofing, acid and alkali resistance, freeze resistance, and UV resistance. Summary of the Invention

[0004] The purpose of this invention is to provide a highly adhesive, elastic, weather-resistant coating, its preparation method, and its application, so as to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] A high-adhesion, elastic, and weather-resistant coating comprises a main agent and a curing agent, wherein the mass ratio of the main agent to the curing agent is 1:0.5 to 1;

[0006] The main component comprises, by weight, 30-60 parts aliphatic resin, 0-10 parts chain extender, 15-40 parts powder, 0.1-1 parts pigment, 2-6 parts topcoat additives, and 0-10 parts organic solvent;

[0007] The curing agent comprises, by weight, 40-75 parts linear flexible resin, 20-50 parts diisocyanate, 5-20 parts solvent, 0-6 parts latent curing agent, 0-0.1 parts stabilizer, and 0.01-0.05 parts amine drying agent;

[0008] The main component of the topcoat includes 0.2 to 1.5 parts of defoamer, 0.1 to 1.0 parts of dispersant, 0.1 to 0.5 parts of leveling agent, 0.1 to 1.0 parts of drying agent, 0 to 1.5 parts of adhesion promoter and 0 to 1.0 parts of ultraviolet absorber.

[0009] The aliphatic resin comprises 30-60 parts of aspartic acid resin and / or 0-30 parts of hydroxyl-terminated polybutadiene acrylonitrile; wherein, the aspartic acid resin is preferably aspartic acid resin F420.

[0010] The powder comprises, by weight, one or more of the following: 10-30 parts titanium dioxide, 2-8 parts barium sulfate, 2.5-5 parts talc, and 0.5-1.5 parts bentonite; wherein the titanium dioxide is rutile titanium dioxide with a particle size of 1000-2000 mesh; the barium sulfate has a particle size of 1000-3000 mesh; the talc has a particle size of 1000-3000 mesh; and the bentonite is organic bentonite.

[0011] The chain extender is one or more of trimethylolpropane, glycerol, BDO, liquid MOCA, and ethylenediamine; preferably glycerol.

[0012] The pigment is one or more of carbon black, medium yellow, phthalocyanine blue, and olive green; preferably carbon black.

[0013] The organic solvent is 0-6 parts by mass of anhydrous xylene and / or 0-6 parts by mass of anhydrous butyl acetate.

[0014] The defoamer is a silicone resin defoamer;

[0015] The dispersant is a wetting and dispersing agent, preferably an ammonium salt copolymer DY-9006 and / or Disponer904S.

[0016] The leveling agent is an acrylate leveling agent, preferably Levelol 839.

[0017] The drying agent is one or more of dibutyltin dilaurate, n-butyllithium, and potassium isozonate.

[0018] The adhesion promoter is an aminosilane compound.

[0019] The ultraviolet absorber is a benzotriazole class of absorber.

[0020] The linear flexible resin is an aliphatic polyol, preferably one or more of MPG / AA polyester polyol, MPD / AA polyester polyol, and polycaprolactone polyol; more preferably, it is Asahikawa XCP-1000M polyester diol, Asahikawa XCP-1000PM polyester diol, or Polyin 2102 polycaprolactone diol.

[0021] The diisocyanate is one or more of HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate), HMDI (dicyclohexylmethane diisocyanate), and XDI (m-phenylene diisocyanate).

[0022] The solvent, by mass, is one or more of the following: 0-20 parts ester solvent, 0-5 parts ketone solvent, and 0-20 parts hydrocarbon solvent; wherein the ester is anhydrous butyl acetate, the ketone is cyclohexanone, and the hydrocarbon is tricresylbenzene or naphtha 100# solvent.

[0023] The latent curing agent is an oxazolidine latent curing agent.

[0024] The stabilizer is one or more of benzoic acid, tartaric acid, and salicylic acid.

[0025] The amine drying agent is an organic amine drying agent, preferably a tertiary amine drying agent.

[0026] In this invention, the high-adhesion elastic weather-resistant coating comprises, by weight, 30-60 parts aspartic acid resin, 0-30 parts hydroxyl-terminated polybutadiene acrylonitrile, 10-30 parts titanium dioxide, 2-8 parts barium sulfate, 2.5-5 parts talc, 0.5-1.5 parts bentonite, 0.1-1 parts pigment, 0.2-1.5 parts defoamer, 0.1-1.0 parts dispersant, 0.1-0.5 parts leveling agent, 0.1-1.0 parts drying agent, 0-1.5 parts adhesion promoter, 0-1.0 parts ultraviolet absorber, 0-10 parts organic solvent, 40-75 parts linear flexible resin, 20-50 parts diisocyanate, 5-20 parts solvent, 0-6 parts latent curing agent, 0-0.1 parts stabilizer, and 0.01-0.05 parts drying agent.

[0027] In this invention, the high-adhesion, elastic, and weather-resistant coating comprises, by weight, 50 parts polyaspartic acid resin F420, 5 parts hydroxyl-terminated polybutadiene acrylonitrile, 0.5 parts glycerol, 24.5 parts rutile titanium dioxide, 5.8 parts 1500-mesh barium sulfate, 4 parts 1250-mesh talc, 0.6 parts organobentonite, 0.5 parts carbon black, 0.3 parts silicone defoamer, 0.3 parts Disponer 904S, and 0.4 parts Levelol 839, 0.3 parts dibutyltin dilaurate, 0.3 parts aminosilane compound, 0.5 parts benzotriazole absorbent, 4 parts anhydrous xylene, 3 parts anhydrous butyl acetate, 55 parts Asahikawa XCP-1000PM polyester diol, 32 parts IPDI, 10.91 parts 100# solvent naphtha, 2 parts oxazolidine latent curing agent, 0.06 parts benzoic acid, 0.03 parts amine drying agent;

[0028] This invention provides a method for preparing the high-adhesion elasticity weather-resistant coating as described above, comprising the following steps:

[0029] The first step involves mixing and grinding aliphatic resin, chain extender, powder pigment, topcoat additives, and organic solvents to obtain the main component;

[0030] Step 2: S1. Add linear flexible resin, heat to 110-120℃, vacuum dehydrate for 1-3 hours, and cool to 50℃; S2. Add diisocyanate and stabilizer, and carry out polymerization reaction at 80-90℃, then add oxazolidine latent curing agent and react for 20-40 minutes; S3. Cool to 65-75℃, add amine drier, then heat to 75-90℃ and react for 20-40 minutes, add solvent, cool to below 65℃, and filter to obtain curing agent.

[0031] The stirring speed in the first step is 800-1500 r / min;

[0032] The stirring speed in the second step is 600–1200 r / min;

[0033] The vacuum degree is ≤-0.08 MPa;

[0034] The process of adding the amine-based drying agent also includes detecting the NCO% value; when the NCO% value is controlled within the range of 5.0 to 15.0%, the solvent is added and the temperature is lowered.

[0035] This invention also provides an application of a high-adhesion elastic weather-resistant coating, which is applied to the coating protection of concrete surfaces. The coating protection includes leveling treatment and coating application to form an elastic layer on the concrete surface; the elastic layer is 300-1500 μm thick; and the coating method is one or more of spraying, rolling, and scraping.

[0036] The positive and progressive effects of this invention are as follows:

[0037] 1. This invention incorporates an adhesion promoter during the preparation process, which improves the adhesion between the coating and the road surface, reduces the risk of coating detachment, and ensures the coating adheres firmly to the road. Additionally, the addition of an oxazolidine latent curing agent allows it to react chemically with other components in the coating to form a high-molecular polymer, thereby curing and hardening the coating and increasing its wear resistance and weather resistance. Furthermore, the addition of a UV absorber absorbs and scatters ultraviolet rays, reducing damage to the coating and extending its service life. During coating application, a leveling agent ensures a more even distribution of the coating on the road surface and reduces pitting, bubbles, and uneven thickness, resulting in a smoother and more aesthetically pleasing coating. The use of these components in high-viscosity coatings helps improve coating performance, increase its durability and anti-aging capabilities, thereby ensuring long-term protection and service life of highway surfaces.

[0038] 2. This invention relates to a high-adhesion, elastic, and weather-resistant coating that can form a high bond with concrete substrates. The coating film exhibits corrosion resistance and UV aging resistance, while also possessing good elasticity and flexibility, resisting temperature changes, and providing excellent waterproofing and anti-corrosion effects. Furthermore, this coating has a high non-volatile content, fast drying speed, high bonding strength, can withstand tensile stress, and exhibits good weather resistance, water impermeability, and freeze resistance.

[0039] 3. The product requires only 1-2 coats, dries quickly, and has a simple application process, without affecting the normal operation of high-speed trains. The high-adhesion, elastic, and weather-resistant coating has a high solids content and is environmentally friendly and safe.

[0040] 4. The preparation method of this invention is simple in process and easy to operate, making it suitable for large-scale industrial production. The uniqueness of the product formulation results in excellent performance and represents an innovation in coating process and preparation method. Detailed Implementation

[0041] To facilitate understanding of the present invention, the invention will be described more fully and in detail below with reference to preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0042] The following table illustrates the components and content of the coatings, in grams, all prepared using the feeding sequence and stirring or temperature and vacuum methods described in the invention.

[0043] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0044] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0045] In this invention, the silicone defoamer used in the embodiments was purchased from Guangzhou Yourun Synthetic Materials Co., Ltd. as a polyurethane high-efficiency defoamer YRXP-07A; the drying agent was purchased from Dongguan Shanmu Chemical Co., Ltd. as a DZ-1PU drying agent.

[0046] Example 1

[0047] The mass fractions of each component added in this embodiment are shown in Table 1.

[0048] Preparation of the main agent: Under stirring, F420, hydroxyl-terminated polybutadiene acrylonitrile, glycerol, Disponer 904S, and Levelol 839 are added sequentially and stirred for more than 20 minutes. Then, organobentonite, carbon black, rutile titanium dioxide, 1500-mesh barium sulfate, and 1250-mesh talc are added sequentially and stirred for more than 20 minutes. Second step: The stirred material is ground and the fineness is tested. The fineness is ≤40μm. Third step: Silicone defoamer, dibutyltin dilaurate, benzotriazole absorbent, aminosilane compound, anhydrous xylene, and anhydrous butyl acetate are added and stirred for more than 30 minutes. After filtration and packaging, the main agent is obtained.

[0049] Adding curing agent: During the preparation process, XCP-1000M / XCP-1000PM / 2102 is added to the reactor. Under stirring, the temperature is raised and controlled at 110-120℃, and then vacuum dehydrated for 1-3 hours to control the moisture content within 500ppm. Then the temperature is lowered to 50℃. HMDI / IPDI and benzoic acid are added, and the temperature is controlled at 80-90℃ for 2-3.5 hours of polymerization. Then oxazolidine latent curing agent is added, and the reaction continues for 20-40 minutes. Then the temperature is lowered to 65-75℃, and amine drying agent is added. The temperature is controlled at 75-90℃ for 20-40 minutes. The NCO value is measured, and then cyclohexanone / trimethylbenzene / 100# solvent naphtha is added. The mixture is stirred for more than 10 minutes and then cooled to below 65℃ to obtain the curing agent.

[0050] In the above preparation, the stirring speed of the main agent is controlled at 800-1500 r / min, and the stirring and grinding temperature is controlled below 60℃; the stirring speed of the curing agent is controlled at 600-1200 r / min, and the vacuum degree is ≤-0.08 MPa.

[0051] Example 2, Example 3

[0052] The preparation steps are as described in Example 1, and the components are added as shown in Table 1:

[0053] Table 1

[0054]

[0055]

[0056] Effect Example

[0057] The properties of the high-elasticity weather-resistant coatings obtained in Examples 1-3 are shown in Table 2.

[0058] Table 2

[0059]

[0060]

[0061] Table 2 shows that the high-adhesion elasticity weather-resistant coatings prepared in each embodiment meet the performance indicators in Table 3.

[0062] Table 3

[0063]

[0064]

[0065] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-adhesion, elastic, and weather-resistant coating, characterized in that, It includes a main agent and a curing agent, wherein the mass ratio of the main agent to the curing agent is 1:0.5~1; The main component comprises, by weight, 30-60 parts aliphatic resin, 0-10 parts chain extender, 15-40 parts powder, 0.1-1 parts pigment, 2-6 parts topcoat additives, and 0-10 parts organic solvent; The curing agent comprises, by weight, 40-75 parts linear flexible resin, 20-50 parts diisocyanate, 5-20 parts solvent, 2-6 parts latent curing agent, 0-0.1 parts stabilizer, and 0.01-0.05 parts amine drying agent; The topcoat additives include 0.2-1.5 parts of defoamer, 0.1-1.0 parts of dispersant, 0.1-0.5 parts of leveling agent, 0.1-1.0 parts of drying agent, 0.2-1.5 parts of adhesion promoter, and 0.3-1.0 parts of ultraviolet absorber; The aliphatic resin is 30-60 parts aspartic acid resin and 5-10 parts hydroxyl-terminated polybutadiene acrylonitrile; The linear flexible resin is one or more of MPG / AA polyester polyol, MPD / AA polyester polyol, and polycaprolactone polyol.

2. The high-adhesion, elastic, and weather-resistant coating as described in claim 1, characterized in that, The powder, by weight, comprises one or more of the following: 10-30 parts titanium dioxide, 2-8 parts barium sulfate, 2.5-5 parts talc, and 0.5-1.5 parts bentonite. The chain extender is one or more of trimethylolpropane, glycerol, BDO, liquid MOCA, and ethylenediamine; The pigment is one or more of carbon black, medium yellow, phthalocyanine blue, and olive green; The organic solvent is 0-6 parts by weight of anhydrous xylene and / or 0-6 parts by weight of anhydrous butyl acetate; The defoamer is a silicone resin defoamer; The dispersant is a wetting and dispersing agent; The leveling agent is an acrylate leveling agent; The drying agent is one or more of dibutyltin dilaurate, n-butyllithium, and potassium isozonate. The adhesion promoter is an aminosilane compound; The ultraviolet absorber is a benzotriazole class of absorber.

3. The high-adhesion, elastic, and weather-resistant coating as described in claim 2, characterized in that, The aspartic acid resin is polyaspartic acid resin F420; The titanium dioxide is 1000-2000 mesh rutile titanium dioxide; The barium sulfate has a particle size of 1000 mesh to 3000 mesh; The talc powder has a particle size of 1000~3000 mesh; The bentonite is organic bentonite; The dispersant is an ammonium salt copolymer DY-9006 and / or Disponer904S; The leveling agent is Levelol 839.

4. The high-adhesion, elastic, and weather-resistant coating as described in claim 1, characterized in that, The linear flexible resin is an aliphatic polyol. The diisocyanate is one or more of HDI, IPDI, HMDI, and XDI; The solvent is one or more of the following, by weight: 0-20 parts ester solvent, 0-5 parts ketone solvent, and 0-20 parts hydrocarbon solvent; The latent curing agent is an oxazolidine latent curing agent; The stabilizer is one or more of benzoic acid, tartaric acid, and salicylic acid. The amine drying agent is an organic amine drying agent.

5. The high-adhesion, elastic, and weather-resistant coating as described in claim 4, characterized in that, The ester solvent is anhydrous butyl acetate; The ketone solvent is cyclohexanone; The amine drying agent is a tertiary amine drying agent; The hydrocarbon solvent is thiol and naphtha 100# solvent.

6. The high-adhesion, elastic, and weather-resistant coating as described in claim 1, characterized in that, By weight, it includes 30-60 parts aspartic acid resin, 5-10 parts hydroxyl-terminated polybutadiene acrylonitrile, 10-30 parts titanium dioxide, 2-8 parts barium sulfate, 2.5-5 parts talc, 0.5-1.5 parts bentonite, 0.1-1 parts pigment, 0.2-1.5 parts defoamer, 0.1-1.0 parts dispersant, 0.1-0.5 parts leveling agent, 0.1-1.0 parts drier, 0.2-1.5 parts adhesion promoter, 0.3-1.0 parts ultraviolet absorber, 0-10 parts organic solvent, 40-75 parts linear flexible resin, 20-50 parts diisocyanate, 5-20 parts solvent, 2-6 parts latent curing agent, 0-0.1 parts stabilizer, and 0.01-0.05 parts drier.

7. The high-adhesion, elastic, weather-resistant coating as described in claim 1, characterized in that, By weight, it comprises 50 parts polyaspartic acid resin F420, 5 parts hydroxyl-terminated polybutadiene acrylonitrile, 0.5 parts glycerol, 24.5 parts rutile titanium dioxide, 5.8 parts 1500 mesh barium sulfate, 4 parts 1250 mesh talc, 0.6 parts organobentonite, 0.5 parts carbon black, 0.3 parts silicone defoamer, 0.3 parts Disponer 904S, 0.4 parts Levelol 839, 0.3 parts dibutyltin dilaurate, 0.3 parts aminosilane compound, 0.5 parts benzotriazole absorbent, 4 parts anhydrous xylene, 3 parts anhydrous butyl acetate, 55 parts Asahikawa XCP-1000PM polyester diol, 32 parts IPDI, 10.91 parts 100# solvent naphtha, 2 parts oxazolidine latent curing agent, 0.06 parts benzoic acid, and 0.03 parts amine drying agent.

8. The method for preparing the high-adhesion elasticity weather-resistant coating as described in claim 1, characterized in that, Includes the following steps: The first step involves mixing and grinding aliphatic resin, chain extender, powder pigment, topcoat additives, and organic solvents to obtain the main component; Step 2: S1. Add linear flexible resin, heat to 110~120℃, vacuum dehydrate for 1~3h, and cool to 50℃; S2. Add diisocyanate and stabilizer, and carry out polymerization reaction at 80~90℃, then add oxazolidine latent curing agent and react for 20~40min; S3. Cool to 65~75℃, add amine drier, then heat to 75~90℃ and react for 20~40min, add solvent, cool to below 65℃, and filter to obtain curing agent.

9. The method for preparing a high-adhesion elasticity weather-resistant coating according to claim 8, characterized in that, The stirring speed in the first step is 800~1500 r / min; In the second step, the stirring speed is 600~1200 r / min; The vacuum degree is ≤-0.08Mpa; The addition of the amine-based drying agent also includes the operation of detecting the NCO% value; Add solvent and cool down when the NCO% value is controlled within the range of 5.0~15.0%.

10. The application of a high-adhesion, elastic, weather-resistant coating as described in any one of claims 1-7, characterized in that, It is applied to the coating protection of concrete surfaces, the coating protection including leveling treatment and coating application, forming an elastic layer on the concrete surface; the elastic layer is 300~1500μm; the coating method is one or more of spraying, rolling, and scraping.

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