A kind of acrylic polysiloxane topcoat that cures quickly in a humid environment and preparation method thereof

Abstract

The invention provides an acrylic polysiloxane topcoat that can be quickly cured in a humid environment and a preparation method thereof, and belongs to the field of topcoats. The topcoat of the invention is prepared from raw materials including resin powder, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming aid, a mildewproof agent, a dispersant, a wetting and anti-shrinkage aid, a thickener, and an anti-settling agent. The topcoat prepared by the specific preparation method and process conditions of the invention has the characteristics of being able to be quickly cured in a humid environment, good curing effect, and having the advantages of anti-cracking, anti-aging performance, and good weather resistance. The invention also has the advantages of good chemical resistance and fast drying, and the gloss, hardness, and solvent resistance of the prepared topcoat are significantly improved.

Description

Technical Field

[0001] The invention relates to the field of topcoats, and in particular to an acrylic polysiloxane topcoat that cures quickly in a humid environment and a preparation method thereof. Background Art

[0002] Topcoat is the final coating of coating, and is the last layer applied in the decoration of building walls. The overall effect presented after decoration is reflected by this layer. Therefore, there are higher requirements for the materials used, not only to have good chroma and brightness, but also to have good pollution resistance, aging resistance, moisture resistance, good mildew resistance, and characteristics such as no pollution to the environment, safety and non-toxicity, no fire hazard, convenient construction, fast film drying, good light and color retention, and good air permeability. The application range of the topcoat with moisture-proof and waterproof performance is relatively wide, and the purpose is to eliminate the negative impact caused by moisture absorption when the material is placed for a long time in low humidity or in a high humidity environment. At present, the main moisture-proof topcoats on the market include polyurethane systems, acrylic resin systems, and organic-inorganic composite moisture-proof topcoats, etc. Although these topcoats have certain waterproof and moisture-proof performance during use, they are difficult to quickly solidify in a humid environment to achieve a protective waterproof and moisture-proof effect. For this reason, the present invention proposes a kind of acrylic polysiloxane topcoat that cures quickly in a humid environment and a preparation method thereof, to solve the defects and shortcomings of the prior art. Summary of the invention

[0003] In view of the above problems, the present invention provides an acrylic polysiloxane topcoat that cures quickly in a humid environment and a preparation method thereof.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] An acrylic polysiloxane topcoat that cures quickly in a humid environment, the topcoat being prepared from the following raw materials in parts by weight:

[0006] Resin powder: 150-200 parts;

[0007] Leveling agent: 1-2 parts;

[0008] Curing photoinitiator: 0.1-1 part;

[0009] Drier: 0.1-0.5 parts;

[0010] Solvent: 20-35 parts;

[0011] Defoaming agent: 0.5-1.5 parts;

[0012] Ultraviolet absorber: 1.5-3 parts;

[0013] Film-forming aid: 1-3 parts;

[0014] Antifungal agent: 0.1-0.8 parts;

[0015] Dispersant: 3-4.5 parts;

[0016] Wetting and anti-cratering additive: 0.1-3 parts;

[0017] Thickener: 4-5.5 parts;

[0018] Anti-settling agent: 0.5-1 part;

[0019] The resin powder is composed of acrylic polysiloxane resin powder and polyurethane resin powder in a mass ratio of (10-15):1.

[0020] Preferably, the topcoat is made of the following raw materials in parts by weight:

[0021] Resin powder: 160-180 parts;

[0022] Leveling agent: 1.2-1.8 parts;

[0023] Curing photoinitiator: 0.3-0.6 parts;

[0024] Drier: 0.1-0.4 parts;

[0025] Solvent: 25-30 parts;

[0026] Defoaming agent: 0.8-1.2 parts;

[0027] Ultraviolet absorber: 1.9-2.3 parts;

[0028] Film-forming aid: 1.4-2.5 parts;

[0029] Antifungal agent: 0.3-0.6 parts;

[0030] Dispersant: 3.8-4.0 parts;

[0031] Wetting and anti-cratering additive: 1.7-2.5 parts;

[0032] Thickener: 4.5-5.1 parts;

[0033] Anti-settling agent: 0.6-0.9 parts.

[0034] Preferably, the topcoat is made of the following raw materials in parts by weight:

[0035] Resin powder: 171 parts;

[0036] Leveling agent: 1.5 parts;

[0037] Curing photoinitiator: 0.45 parts;

[0038] Drier: 0.25 parts;

[0039] Solvent: 27 parts;

[0040] Defoaming agent: 0.9 parts;

[0041] Ultraviolet light absorber: 2.1 parts;

[0042] Film-forming aid: 2.1 parts;

[0043] Antifungal agent: 0.45 parts;

[0044] Dispersant: 3.9 parts;

[0045] Wetting and anti-cratering agent: 2.2 parts;

[0046] Thickener: 4.8 parts;

[0047] Anti-settling agent: 0.75 parts.

[0048] Preferably, the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin in a mass ratio of 12:1.

[0049] Preferably, the leveling agent is at least one of silicone, BYK163, BYK322, BYK333, polyurethane, acrylic leveling agent, and diacetone alcohol;

[0050] The curing photoinitiator is at least one of acylphosphine oxide initiator, bisacylphosphine oxide initiator, Bayer N3375 and Bayer N75;

[0051] The drying agent is at least one of dibutyltin dilaurate, dicumyl peroxide, and cyclohexane acid;

[0052] The solvent is at least one of butyl acetate, ethyl acetate, butyl acetate, toluene, xylene, and ethylene glycol ethyl ether acetate;

[0053] The defoamer is at least one of organic silicon BNK-NSF063A, organic silicon BNK-NSF068, and modified silicone;

[0054] The ultraviolet absorber is at least one of liquid hydroxybenzotriazole type and 2-(2-hydroxy-5-methylphenyl)benzotriazole;

[0055] The film-forming aid is at least one of ethylene glycol butyl ether, propylene glycol butyl ether, propylene glycol methyl ether PM, dodecyl alcohol ester, and hexanediol butyl ether acetate;

[0056] The mildew preventer is at least one of an aryl urea derivative, a quaternary ammonium salt mildew preventer and n-octyl isothiazolinone;

[0057] The dispersant is at least one of methyl amyl alcohol, BYK161, and BYK163;

[0058] The wetting and anti-cratering auxiliary agent is a polyether siloxane-based substrate wetting agent;

[0059] The thickener is at least one of methyl cellulose, pectin and starch;

[0060] The anti-settling agent is polyamide wax.

[0061] The preferred method for preparing the acrylic polysiloxane topcoat specifically comprises the following steps:

[0062] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 55-60° C. for 1.5-2 hours, and continuously introducing nitrogen during the reaction, and controlling the nitrogen flow rate to be 50-75 ml / min;

[0063] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming agent, a mildew preventer, a dispersant, a wetting and anti-cratering agent, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 400-500W, the ultrasonic time is controlled at 20-45min, and then dispersed in a 1000-1200rpm high-speed disperser;

[0064] (3) Finally, add a sodium bicarbonate aqueous solution, mix and stir in a stirring kettle at 65-70° C. and 600-800 rpm, and degas after high-speed dispersion to obtain the topcoat.

[0065] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the topcoat of the present invention has the characteristics of being able to cure quickly in a humid environment, has a good curing effect, and has the advantages of good crack resistance, aging resistance, and weather resistance. The present invention also has the advantages of good chemical resistance and fast drying. The gloss, hardness, and solvent resistance of the prepared topcoat are significantly improved. DETAILED DESCRIPTION

[0066] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] The raw material purchasing options in the process of preparing topcoat are:

[0068] Leveling agents include silicone, BYK163, BYK322, BYK333, polyurethane, acrylic leveling agents, and diacetone alcohol;

[0069] The curing photoinitiator is acylphosphine oxide initiator, bisacylphosphine oxide initiator, Bayer N3375, Bayer N75;

[0070] The drying agent is dibutyltin dilaurate, diisopropylbenzene peroxide, and cyclohexane acid;

[0071] The solvents are butyl acetate, ethyl acetate, butyl acetate, toluene, xylene, and ethylene glycol ethyl ether acetate;

[0072] The defoaming agent is organic silicon BNK-NSF063A, organic silicon BNK-NSF068, and modified silicone;

[0073] The ultraviolet absorber is a liquid hydroxybenzotriazole type, 2-(2-hydroxy-5-methylphenyl)benzotriazole;

[0074] The film-forming aids are ethylene glycol butyl ether, propylene glycol butyl ether, propylene glycol methyl ether PM, dodecyl alcohol ester, and hexanediol butyl ether acetate;

[0075] The mildew-proof agents are aryl urea derivatives, quaternary ammonium mildew-proof agents, and n-octyl isothiazolinone;

[0076] The dispersants are methyl amyl alcohol, BYK161, and BYK163;

[0077] The wetting and anti-cratering additive is a polyether siloxane-based substrate wetting agent;

[0078] Thickeners are methylcellulose, pectin, and starch;

[0079] The anti-settling agent is polyamide wax.

[0080] Embodiment 1:

[0081] The raw materials for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment of this embodiment are shown in the following table:

[0082] raw material Weight raw material Weight Acrylic polysiloxane resin 157.85 Film-forming aids 2.1 Polyurethane resin 13.15 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and Anti-cratering Additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0083] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 12:1;

[0084] The preparation method of the topcoat of this embodiment prepared by the raw materials in the above table specifically comprises the following steps:

[0085] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 60° C. for 2 h. During the reaction, nitrogen is continuously introduced at a flow rate of 60 ml / min.

[0086] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, a UV absorber, a film-forming aid, a mildew preventer, a dispersant, a wetting and anti-cratering aid, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 450 W, the ultrasonic time is controlled at 30 min, and then dispersed in a 1100 rpm high-speed disperser;

[0087] (3) Finally, sodium bicarbonate solution and nano zinc oxide powder were added, mixed and stirred in a stirring kettle at 67° C. and 700 rpm, and degassed after high-speed dispersion to obtain the topcoat.

[0088] Embodiment 2:

[0089] The raw materials for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment of this embodiment are shown in the following table:

[0090] raw material Weight raw material Weight Acrylic polysiloxane resin 148.57 Film-forming aids 1.4 Polyurethane resin 11.43 Antifungal agent 0.3 Leveling agent 1.2 Dispersants 3.8 Curing Photoinitiator 0.3 Wetting and Anti-cratering Additives 1.7 Drier 0.1 Thickener 4.5 Solvents 25 Anti-settling agent 0.6 Defoaming agent 0.8 Sodium bicarbonate solution 2.2 UV absorber 1.9 Nano zinc oxide powder 4.2

[0091] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 13:1;

[0092] The preparation method of the topcoat of this embodiment prepared by the raw materials in the above table specifically comprises the following steps:

[0093] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 60° C. for 2 h. During the reaction, nitrogen is continuously introduced at a flow rate of 75 ml / min.

[0094] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming aid, a mildew preventer, a dispersant, a wetting and anti-cratering aid, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 500 W, the ultrasonic time is controlled at 45 min, and then dispersed in a 1200 rpm high-speed disperser;

[0095] (3) Finally, sodium bicarbonate solution and nano zinc oxide powder were added, mixed and stirred in a stirring kettle at 70° C. and 800 rpm, and degassed after high-speed dispersion to obtain the topcoat.

[0096] Embodiment 3:

[0097] The raw materials for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment of this embodiment are shown in the following table:

[0098] raw material Weight raw material Weight Acrylic polysiloxane resin 168 Film-forming aids 1.4 Polyurethane resin 12 Antifungal agent 0.3 Leveling agent 1.8 Dispersants 3.8 Curing Photoinitiator 0.3 Wetting and Anti-cratering Additives 1.7 Drier 0.1 Thickener 4.5 Solvents 25 Anti-settling agent 0.6 Defoaming agent 0.8 Sodium bicarbonate solution 2.2 UV absorber 1.9 Nano zinc oxide powder 4.2

[0099] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 14:1;

[0100] The preparation method of the topcoat of this embodiment prepared by the raw materials in the above table specifically comprises the following steps:

[0101] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 55° C. for 1.5 h. During the reaction, nitrogen is continuously introduced at a flow rate of 50 ml / min.

[0102] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming aid, a mildew preventer, a dispersant, a wetting and anti-cratering aid, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 400 W, the ultrasonic time is controlled at 20 min, and then dispersed in a 1000 rpm high-speed disperser;

[0103] (3) Finally, sodium bicarbonate solution and nano zinc oxide powder were added, mixed and stirred in a stirring kettle at 65° C. and 600 rpm, and degassed after high-speed dispersion to obtain the topcoat.

[0104] Embodiment 4:

[0105] The raw materials for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment of this embodiment are shown in the following table:

[0106] raw material Weight raw material Weight Acrylic polysiloxane resin 140.62 Film-forming aids 1 Polyurethane resin 9.38 Antifungal agent 0.1 Leveling agent 1 Dispersants 3 Curing Photoinitiator 0.1 Wetting and Anti-cratering Additives 0.1 Drier 0.1 Thickener 4 Solvents 20 Anti-settling agent 0.5 Defoaming agent 0.5 Sodium bicarbonate solution 2 UV absorber 1.5 Nano zinc oxide powder 3.5

[0107] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 15:1;

[0108] The preparation method of the topcoat of this embodiment prepared by the raw materials in the above table specifically comprises the following steps:

[0109] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 60° C. for 2 h. During the reaction, nitrogen is continuously introduced at a flow rate of 70 ml / min.

[0110] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming aid, a mildew preventer, a dispersant, a wetting and anti-cratering aid, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 500 W, the ultrasonic time is controlled at 35 min, and then dispersed in a 1200 rpm high-speed disperser;

[0111] (3) Finally, sodium bicarbonate solution and nano zinc oxide powder are added, mixed and stirred in a stirring kettle at 70° C. and 650 rpm, and degassed after high-speed dispersion to obtain the topcoat.

[0112] Embodiment 5:

[0113] The raw materials for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment of this embodiment are shown in the following table:

[0114] raw material Weight raw material Weight Acrylic polysiloxane resin 183.33 Film-forming aids 3 Polyurethane resin 16.67 Antifungal agent 0.8 Leveling agent 2 Dispersants 4.5 Curing Photoinitiator 1 Wetting and anti-cratering additives 3 Drier 0.5 Thickener 5.5 Solvents 35 Anti-settling agent 1 Defoaming agent 1.5 Sodium bicarbonate solution 3.5 UV absorber 3 Nano zinc oxide powder 6

[0115] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 11:1;

[0116] The preparation method of the topcoat of this embodiment prepared by the raw materials in the above table specifically comprises the following steps:

[0117] (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 60° C. for 2 h. During the reaction, nitrogen is continuously introduced at a flow rate of 75 ml / min.

[0118] (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming aid, a mildew preventer, a dispersant, a wetting and anti-cratering aid, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 500 W, the ultrasonic time is controlled at 45 min, and then dispersed in a 1200 rpm high-speed disperser;

[0119] (3) Finally, sodium bicarbonate solution and nano zinc oxide powder were added, mixed and stirred in a stirring kettle at 70° C. and 800 rpm, and degassed after high-speed dispersion to obtain the topcoat.

[0120] Comparative Example 1:

[0121] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0122] raw material Weight raw material Weight Acrylic polysiloxane resin 171 Film-forming aids 2.1 Polyurethane resin / Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and Anti-cratering Additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0123] Wherein: the resin powder is acrylic polysiloxane resin powder;

[0124] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0125] Comparative Example 2:

[0126] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0127] raw material Weight raw material Weight Acrylic polysiloxane resin 146.77 Film-forming aids 2.1 Polyurethane resin 24.23 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and Anti-cratering Additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0128] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 6:1;

[0129] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0130] Comparative Example 3:

[0131] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0132] raw material Weight raw material Weight Acrylic polysiloxane resin 136.8 Film-forming aids 2.1 Polyurethane resin 34.2 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and anti-cratering additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0133] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 4:1;

[0134] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0135] Comparative Example 4:

[0136] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0137] raw material Weight raw material Weight Acrylic polysiloxane resin 149.62 Film-forming aids 2.1 Polyurethane resin 21.38 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and Anti-cratering Additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0138] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 7:1;

[0139] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0140] Comparative Example 5:

[0141] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0142]

[0143]

[0144] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 8:1;

[0145] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0146] Comparative Example 6:

[0147] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0148] raw material Weight raw material Weight Acrylic polysiloxane resin 153.9 Film-forming aids 2.1 Polyurethane resin 17.1 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and anti-cratering additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0149] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 9:1;

[0150] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0151] Comparative Example 7:

[0152] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0153] raw material Weight raw material Weight Acrylic polysiloxane resin 160.94 Film-forming aids 2.1 Polyurethane resin 10.06 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and Anti-cratering Additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder 4.8

[0154] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 16:1;

[0155] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0156] Comparative Example 8:

[0157] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are the same as those of Example 1, except for the different mass ratios of acrylic polysiloxane resin and polyurethane resin, as shown in the following table:

[0158]

[0159]

[0160] Wherein: the resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin powder in a mass ratio of 17:1;

[0161] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0162] Comparative Example 9:

[0163] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are shown in the following table:

[0164] raw material Weight raw material Weight Acrylic polysiloxane resin 157.85 Film-forming aids 2.1 Polyurethane resin 13.15 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and anti-cratering additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution 2.7 UV absorber 2.1 Nano zinc oxide powder /

[0165] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0166] Comparative Example 10:

[0167] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are shown in the following table:

[0168]

[0169]

[0170] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0171] Comparative Example 11:

[0172] The raw materials for preparing the acrylic polysiloxane topcoat for rapid curing in a humid environment of this comparative example are shown in the following table:

[0173] raw material Weight raw material Weight Acrylic polysiloxane resin 157.85 Film-forming aids 2.1 Polyurethane resin 13.15 Antifungal agent 0.45 Leveling agent 1.5 Dispersants 3.9 Curing Photoinitiator 0.45 Wetting and anti-cratering additives 2.2 Drier 0.25 Thickener 4.8 Solvents 27 Anti-settling agent 0.75 Defoaming agent 0.9 Sodium bicarbonate solution / UV absorber 2.1 Nano zinc oxide powder /

[0174] The preparation method of the topcoat of this comparative example is the same as that of Example 1 using the raw materials in the above table.

[0175] Performance test of topcoat:

[0176] The substrate was polished with 400-mesh sandpaper and sprayed with UV primer. The viscosity of the acrylic polysiloxane topcoat for rapid curing in a humid environment prepared in the examples and comparative examples was adjusted to No. 3 Ford Cup 60s, applied with a coating amount of 110 g / m2, baked at 70°C for 10 min, and instantaneously cured with an ultraviolet mercury lamp with an energy of 260-360 mj / cm2. The obtained topcoat was subjected to a performance test.

[0177] 1. Paint film adhesion: The adhesion of the topcoat is tested according to standard GBT 17621980.

[0178] (1) Turn the test sample upside down and let the filter paper fall freely or tap the sample with your index finger. If the filter paper falls, it is recorded as level 1.

[0179] (2) If the filter paper is lightly lifted and there are marks and sparse and light filter paper fibers adhering to it, and the total fiber area is within 1 / 3 cm2, it is recorded as level 2;

[0180] (3) If there are marks on the filter paper when lightly lifting it, and dense filter paper fibers are stuck to it, and the total fiber area is 1 / 3-1 / 2cm2, it is recorded as level 3.

[0181] 2. Paint film hardness test: The hardness of the prepared paint film is tested according to the standard GB / T6739-1996, using the A method testing machine method. The larger the H value, the greater the hardness of the paint film.

[0182] 3. Curing time: Use the cotton ball pressing method. In a humid environment with a relative humidity greater than 98%, press a cotton ball on the paint film of the fabric with a drying tester. Remove the tester and the cotton ball after 30 seconds. If there is no cotton ball mark or gloss loss on the paint film, it is considered to be actually dry. Calculate the time used to achieve actual drying.

[0183] Table 1:

[0184]

[0185] Table 2:

[0186]

[0187]

[0188] Based on Table 1 and Table 2, we can conclude that:

[0189] (1) When the mass ratio of acrylic polysiloxane resin powder to polyurethane resin powder is 12:1, in the preparation step of this embodiment, a topcoat with the fastest curing speed can be obtained, and the curing time is 6.5 min;

[0190] (2) When the proportion of polyurethane resin powder is increased or the proportion of acrylic polysiloxane resin powder is reduced, the curing time of the paint surface increases;

[0191] (3) Adding sodium bicarbonate solution and nano zinc oxide powder can reduce the tackiness of the topcoat during the curing process.

[0192] 4. Water vapor permeation resistance and adhesion test of topcoat

[0193] (1) The specific method for testing the permeability of the acrylic polysiloxane topcoat that cures rapidly in a humid environment in this embodiment is as follows: the topcoat is placed in a sealed chamber filled with a mixture of heated saturated air and water vapor. The room temperature is generally maintained at 38°C. Under 100% relative humidity, the slight temperature difference between the topcoat and the surrounding water vapor will cause water droplets to condense on the sample. By changing the test time, the external conditions can be adjusted. The water droplets penetrate into the topcoat coating. The penetration speed is determined by the performance of the topcoat coating itself. Color change, blistering, decreased adhesion, softening, embrittlement, etc. are detected.

[0194] The degree of color change, blistering, softening and brittleness is classified into:

[0195] Level 1: no color change, no blistering, no softening, no brittleness;

[0196] Level 2: slight color change, slight bubbling, slight softening, slight brittleness;

[0197] Level 3: obvious color change, obvious blistering, obvious softening, and obvious brittleness;

[0198] Level 4: Severe color change, severe blistering, severe softening, and severe brittleness.

[0199] (2) The adhesion test of the topcoat shall be carried out in accordance with GB / T9286-1998 "Scratch test for paint and varnish films".

[0200] The test results are classified as follows:

[0201] Level 0: The cutting edge is completely smooth, without any falling off;

[0202] Level 1: A small amount of coating falls off at the intersection of the cuts, but the cross-cut area affected cannot be significantly greater than 5%;

[0203] Level 2: Coating peels off at the intersection of the cuts and / or along the edges of the cuts, and the affected cross-cut area is significantly greater than 5%, but not significantly greater than 15%;

[0204] Level 3: The coating partially or completely falls off in large pieces along the cut edge, and / or partially or completely peels off at different parts of the grid, and the affected cross-cut area is significantly greater than 15%, but not significantly greater than 35%;

[0205] Level 4: The coating peels off in large pieces along the cut edges, and / or some squares are partially or completely peeled off. The affected cross-cut area is significantly greater than 35%, but not significantly greater than 65%;

[0206] Level 5: The degree of thorn drop exceeds that of level 4.

[0207] Table 3:

[0208]

[0209] Table 4:

[0210]

[0211] Based on the above, we can conclude that:

[0212] (1) When the proportion of polyurethane resin powder is increased or the proportion of acrylic polysiloxane resin powder is reduced, the overall adhesion of the topcoat will be reduced;

[0213] (2) It can be concluded from the comparative example that when sodium bicarbonate and nano zinc oxide powder are added to adjust the alkaline environment during the preparation of the topcoat, the resin as a whole can have higher waterproof and moisture resistance.

[0214] 5. Chemical resistance and salt spray performance test of topcoat

[0215] (1) Chemical resistance test The topcoat of this embodiment and the comparative example was tested in accordance with GB / T1763-79 (89) "Method for determining chemical resistance of paint films", wherein the salt water resistance was determined according to Method A (i.e., normal temperature salt water resistance method), with a 10% sulfuric acid solution as the acid, a 10% sodium hydroxide solution as the alkali, and a 10% sodium chloride solution as the salt.

[0216] The inspection and evaluation standards are as follows: at the specified time (10 days), observe whether the paint film has peeling, wrinkling, blistering, spots, rust, discoloration, and gloss loss. If so, it is unqualified, otherwise it is qualified.

[0217] (2) The salt spray resistance test of the topcoat shall be carried out in accordance with GB / T1771-2007 "Determination of neutral salt spray resistance of paints and varnishes". The surface coating is qualified if there is no rust, blistering, or shedding.

[0218] Table 5:

[0219]

[0220] Table 6:

[0221]

[0222] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An acrylic polysiloxane topcoat that cures quickly in a humid environment, characterized in that: The topcoat is prepared from the following raw materials in parts by weight: Resin powder: 150-200 parts; Leveling agent: 1-2 parts; Curing photoinitiator: 0.1-1 part; Drier: 0.1-0.5 parts; Solvent: 20-35 parts; Defoaming agent: 0.5-1.5 parts; Ultraviolet absorber: 1.5-3 parts; Film-forming aid: 1-3 parts; Antifungal agent: 0.1-0.8 parts; Dispersant: 3-4.5 parts; Wetting and anti-cratering additive: 0.1-3 parts; Thickener: 4-5.5 parts; Anti-settling agent: 0.5-1 part; Sodium bicarbonate solution: 2-3.5 parts; Nano zinc oxide powder: 3.5-6 parts; The resin powder is composed of acrylic polysiloxane resin powder and polyurethane resin powder in a mass ratio of (10-15):

1.

2. The acrylic polysiloxane topcoat that cures quickly in a humid environment according to claim 1, characterized in that: The topcoat is made from the following raw materials in parts by weight: Resin powder: 160-180 parts; Leveling agent: 1.2-1.8 parts; Curing photoinitiator: 0.3-0.6 parts; Drier: 0.1-0.4 parts; Solvent: 25-30 parts; Defoaming agent: 0.8-1.2 parts; Ultraviolet absorber: 1.9-2.3 parts; Film-forming aid: 1.4-2.5 parts; Antifungal agent: 0.3-0.6 parts; Dispersant: 3.8-4.0 parts; Wetting and anti-cratering additive: 1.7-2.5 parts; Thickener: 4.5-5.1 parts; Anti-settling agent: 0.6-0.9 parts; Sodium bicarbonate solution: 2.2-3 parts; Nano zinc oxide powder: 4.2-5.4 parts.

3. The acrylic polysiloxane topcoat that cures rapidly in a humid environment according to claim 2, characterized in that: The topcoat is made from the following raw materials in parts by weight: Resin powder: 171 parts; Leveling agent: 1.5 parts; Curing photoinitiator: 0.45 parts; Drier: 0.25 parts; Solvent: 27 parts; Defoaming agent: 0.9 parts; Ultraviolet light absorber: 2.1 parts; Film-forming aid: 2.1 parts; Antifungal agent: 0.45 parts; Dispersant: 3.9 parts; Wetting and anti-cratering agent: 2.2 parts; Thickener: 4.8 parts; Anti-settling agent: 0.75 parts; Sodium bicarbonate solution: 2.7 parts; Nano zinc oxide powder: 4.8 parts.

4. The acrylic polysiloxane topcoat that cures rapidly in a humid environment according to claim 1, characterized in that: The resin powder is composed of acrylic polysiloxane resin powder and the polyurethane resin in a mass ratio of 12:

1.

5. The acrylic polysiloxane topcoat that cures rapidly in a humid environment according to claim 1, characterized in that: The leveling agent is at least one of silicone, BYK163, BYK322, BYK333, polyurethane, acrylic leveling agent, and diacetone alcohol; The curing photoinitiator is at least one of an acylphosphine oxide initiator and a bisacylphosphine oxide initiator; The drying agent is at least one of dibutyltin dilaurate, dicumyl peroxide, and cyclohexane acid; The solvent is at least one of butyl acetate, ethyl acetate, butyl acetate, toluene, xylene, and ethylene glycol ethyl ether acetate; The defoamer is at least one of organic silicon BNK-NSF063A, organic silicon BNK-NSF068, and modified silicone; The ultraviolet absorber is at least one of liquid hydroxybenzotriazole type and 2-(2-hydroxy-5-methylphenyl)benzotriazole; The film-forming aid is at least one of ethylene glycol butyl ether, propylene glycol butyl ether, propylene glycol methyl ether PM, dodecyl alcohol ester, and hexanediol butyl ether acetate; The mildew preventer is at least one of an aryl urea derivative, a quaternary ammonium salt mildew preventer and n-octyl isothiazolinone; The dispersant is at least one of methyl amyl alcohol, BYK161, and BYK163; The wetting and anti-cratering auxiliary agent is a polyether siloxane-based substrate wetting agent; The thickener is at least one of methyl cellulose, pectin and starch; The anti-settling agent is polyamide wax.

6. The method for preparing the acrylic polysiloxane topcoat that cures rapidly in a humid environment according to any one of claims 1 to 5, characterized in that: The preparation method of the acrylic polysiloxane topcoat specifically comprises the following steps: (1) adding acrylic polysiloxane resin powder and polyurethane resin to a solvent and mixing them thoroughly, adding an initiator, and then adding distilled water and reacting at 55-60° C. for 1.5-2 hours, and continuously introducing nitrogen during the reaction, and controlling the nitrogen flow rate to be 50-75 ml / min; (2) After the reaction is completed, a leveling agent, a curing photoinitiator, a drying agent, a solvent, a defoamer, an ultraviolet absorber, a film-forming agent, a mildew preventer, a dispersant, a wetting and anti-cratering agent, a thickener and an anti-settling agent are added and mixed thoroughly, and then ultrasonic treatment is performed, the ultrasonic power is controlled at 400-500W, the ultrasonic time is controlled at 20-45min, and then dispersed in a 1000-1200rpm high-speed disperser; (3) Finally, sodium bicarbonate solution and nano zinc oxide powder are added, mixed and stirred in a stirring kettle at 65-70° C. and 600-800 rpm, and degassed after high-speed dispersion to obtain the topcoat.

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