Bio-based coating as well as preparation method, application and application method thereof

Abstract

The invention belongs to the technical field of coatings, and provides a bio-based coating as well as a preparation method, application and an application method thereof. The bio-based coating disclosed by the invention takes the specially-made bio-based hyperbranched resin as a base material, so that the content of VOC (Volatile Organic Compounds) in the bio-based coating is reduced, and the bio-based coating is more environment-friendly. Meanwhile, the specially-made bio-based hyperbranched resin is combined with the first pigment, the second pigment and the filler, so that the content of non-volatile substances of the bio-based coating is high, and the corrosion resistance, the weather resistance, the acid and alkali resistance and the salt fog resistance of the bio-based coating are further improved. In addition, the construction benefit of the bio-based paint is improved by 40% compared with that of the existing ship anticorrosive paint. Furthermore, the raw materials of the bio-based coating are common chemicals, dangerous chemicals are not used, and the safety risk in the processes of production, storage, transportation and the like is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular to a bio-based coating and a preparation method and application thereof. Background Art

[0002] Marine coatings are one of the important raw materials for the shipbuilding industry, and their cost accounts for 5-20% of the total ship cost. The performance and coating quality of marine coatings directly affect the ship's anti-corrosion protection, navigation status and fuel costs. Currently, the coatings used on ships on the market are mainly chlorinated rubber paint, epoxy paint, alkyd paint, and polyurethane, which have problems such as easy shedding, complex construction process, and high VOC emissions.

[0003] The related art discloses a high-solid bio-based polyurethane intermediate paint having a high VOC content. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a bio-based coating and a preparation method and application thereof. The bio-based coating provided by the present invention has a low VOC content.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a bio-based coating, comprising a component A and a component B;

[0007] The component A comprises the following components in parts by weight:

[0008] 100 parts of bio-based hyperbranched resin, 20-85 parts of first pigment, 48-100 parts of filler, 5-45 parts of second pigment, 2-15 parts of dispersant, 30-66 parts of first solvent, 3-50 parts of auxiliary agent;

[0009] The component B comprises the following components in parts by weight:

[0010] 100 parts of isocyanate, 5 to 33 parts of the second solvent;

[0011] The preparation method of the bio-based hyperbranched resin comprises the following steps:

[0012] The vegetable oil and the polyol are mixed and alcoholyzed to obtain an alcoholysis system;

[0013] The alcoholysis system and the acidic substance are mixed to carry out an ester exchange reaction to obtain the bio-based hyperbranched resin;

[0014] The vegetable oils include soybean oil, linseed oil, tung oil and castor oil;

[0015] The polyol includes one or more of neopentyl glycol, trimethylolpropane, pentaerythritol, glycerol and ethylene glycol;

[0016] The acidic substance includes one or more of carboxylic acid and acid anhydride, the carboxylic acid includes benzoic acid, and the acid anhydride includes phthalic anhydride and / or maleic anhydride;

[0017] The weight ratio of component A to component B is 3:1.

[0018] Preferably, the weight ratio of soybean oil, linseed oil, tung oil and castor oil is 2-4:1-3:1-3:2-4;

[0019] The molar ratio of the vegetable oil to the polyol is 3 to 4:1;

[0020] The alcoholysis temperature is 235-245°C and the time is 2-4h;

[0021] The molar ratio of the polyol to the acidic substance is 1 to 2:1;

[0022] The temperature of the transesterification reaction is 210-230° C., and the time is 4-12 hours.

[0023] Preferably, the first pigment includes one or more of titanium dioxide, phthalocyanine blue, medium chrome yellow and carbon black;

[0024] The filler includes one or more of barium sulfate, talcum powder and silica fume;

[0025] The second pigment includes one or more of zinc oxide, zinc phosphate, iron titanium powder and zinc chrome yellow.

[0026] Preferably, the dispersant comprises an acid-modified polymer, and the acid-modified polymer comprises a carboxylic acid-modified polyurethane.

[0027] Preferably, the first solvent includes one or more of ethylene glycol diacetate (EGDA), propylene glycol methyl ether acetate (PMA) and diethylene glycol butyl ether.

[0028] Preferably, the auxiliary agent includes a defoamer and / or a leveling agent; the defoamer includes one or more of a non-silicone polymer, a fluorine-modified silicone and a silicone polymer; the leveling agent includes one or more of a modified acrylate copolymer, a fluorine-modified acrylate copolymer and a polyether-modified siloxane.

[0029] Preferably, the isocyanate includes one or more of toluene-2,4-diisocyanate (TDI), hexamethylene diisocyanate (HDI) and 4,4'-methylenebis(phenyl isocyanate) (MDI); the second solvent includes one or more of ethylene glycol diacetate (EGDA), propylene glycol methyl ether acetate (PMA) and diethylene glycol butyl ether.

[0030] The present invention also provides a method for preparing the bio-based coating described in the above technical solution, comprising the following steps:

[0031] The bio-based hyperbranched resin, the first pigment, the filler, the second pigment and the dispersant are sequentially mixed, dispersed and ground to obtain a premix;

[0032] Mixing the premix, the first solvent and the auxiliary agent to obtain the component A;

[0033] The isocyanate and the second solvent are mixed to obtain the second component.

[0034] The present invention also provides the use of the bio-based coating described in the above technical solution in ship protection.

[0035] The present invention also provides an application method of the bio-based coating described in the above technical solution, comprising the following steps:

[0036] Mix component A and component B and cure;

[0037] The curing temperature is -4 to 40°C and the curing time is 15 to 24 hours.

[0038] The present invention provides a bio-based coating. The bio-based coating of the present invention uses a specially prepared bio-based hyperbranched resin as a base material, reduces the content of VOC in the bio-based coating, and is more environmentally friendly. At the same time, the specially prepared bio-based hyperbranched resin is combined with a first pigment, a second pigment and a filler, so that the non-volatile matter content of the bio-based coating is high, thereby improving the corrosion resistance, weather resistance, acid and alkali resistance and salt spray resistance of the bio-based coating. In addition, the bio-based coating of the present invention improves the construction efficiency by 40% compared with the current ship anti-corrosion coating.

[0039] Furthermore, the raw materials of the bio-based coating of the present invention are all general chemicals, no hazardous chemicals are used, and the safety risks in the processes of production, storage, transportation, etc. are significantly reduced. DETAILED DESCRIPTION

[0040] The present invention provides a bio-based coating, comprising a component A and a component B;

[0041] The component A comprises the following components in parts by weight:

[0042] 100 parts of bio-based hyperbranched resin, 20-85 parts of first pigment, 48-100 parts of filler, 5-45 parts of second pigment, 2-15 parts of dispersant, 30-66 parts of first solvent, 3-50 parts of auxiliary agent;

[0043] The component B comprises the following components in parts by weight:

[0044] 100 parts of isocyanate, 5 to 33 parts of the second solvent;

[0045] The preparation method of the bio-based hyperbranched resin comprises the following steps:

[0046] The vegetable oil and the polyol are mixed and alcoholyzed to obtain an alcoholysis system;

[0047] The alcoholysis system and the acidic substance are mixed to carry out an ester exchange reaction to obtain the bio-based hyperbranched resin;

[0048] The vegetable oils include soybean oil, linseed oil, tung oil and castor oil;

[0049] The polyol includes one or more of neopentyl glycol, trimethylolpropane, pentaerythritol, glycerol and ethylene glycol;

[0050] The acidic substance includes one or more of carboxylic acid and acid anhydride, the carboxylic acid includes benzoic acid, and the acid anhydride includes phthalic anhydride and / or maleic anhydride;

[0051] The weight ratio of component A to component B is 3:1.

[0052] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0053] The bio-based coating provided by the present invention includes component A; the component A includes the following components in parts by weight: 100 parts of bio-based hyperbranched resin, 20 to 85 parts of a first pigment, 48 to 100 parts of a filler, 5 to 45 parts of a second pigment, 2 to 15 parts of a dispersant, 30 to 66 parts of a first solvent, and 3 to 50 parts of an additive.

[0054] In the present invention, the component A comprises 100 parts by weight of a bio-based hyperbranched resin. In the present invention, the method for preparing the bio-based hyperbranched resin comprises the following steps:

[0055] The vegetable oil and the polyol are mixed and alcoholyzed to obtain an alcoholysis system;

[0056] The alcoholysis system and the acidic substance are mixed to carry out an ester exchange reaction to obtain the bio-based hyperbranched resin.

[0057] In the present invention, the vegetable oil includes soybean oil, linseed oil, tung oil and castor oil; the weight ratio of the soybean oil, linseed oil, tung oil and castor oil is preferably 2-4:1-3:1-3:2-4, specifically 3:3:1:3, 3:3:1:2, 3:3:1:3, 3:3:1.5:3, 3:1:3:3. In the present invention, the polyol includes one or more of neopentyl glycol, trimethylolpropane, pentaerythritol, glycerol and ethylene glycol, and further preferably includes one or more of neopentyl glycol, trimethylolpropane and pentaerythritol. In the present invention, the amount ratio of the vegetable oil and the polyol is preferably 3-4:1, specifically 3:1, 3.2:1, 3.4:1, 3.6:1, 3.8:1 or 4:1. In the present invention, the alcoholysis temperature is preferably 235-245°C, specifically 235°C, 240°C or 245°C; the time is preferably 2-4h, specifically 2h, 3h or 4h. After the alcoholysis, the present invention obtains the alcoholysis system without any treatment.

[0058] In the present invention, the acidic substance includes one or more of carboxylic acid and acid anhydride. In the present invention, the carboxylic acid includes benzoic acid. In the present invention, the acid anhydride includes phthalic anhydride and / or maleic anhydride, preferably phthalic anhydride. In a specific embodiment of the present invention, the acidic substance can be phthalic anhydride, or a mixture of phthalic anhydride and benzoic acid, and the ratio of the amount of phthalic anhydride to benzoic acid in the mixture of phthalic anhydride and benzoic acid is preferably 8:1 to 10:1, specifically 8:1, 9:1 or 10:1. In the present invention, the ratio of the amount of the polyol to the acidic substance is preferably 1 to 2:1, specifically 1:1, 1.2:1, 1.4:1, 1.5:1, 1.6:1, 1.8:1 or 2:1. In the present invention, the temperature of the transesterification reaction is preferably 210-230°C, specifically 210°C, 215°C, 220°C, 225°C or 230°C, and the time is preferably 4-12h, specifically 4h, 5h, 6h, 9h or 12h. After the transesterification reaction, the present invention preferably cools to room temperature to obtain the bio-based hyperbranched resin.

[0059] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 20 to 85 parts by weight of the first pigment, specifically 20, 25, 30, 35, 40, 45, 50, 55, 60, 63, 65, 70, 75, 80 or 85 parts. In the present invention, the first pigment preferably includes one or more of titanium dioxide, phthalocyanine blue, medium chrome yellow and carbon black. In the present invention, the particle size of the first pigment is preferably 100 mesh to 1000 mesh.

[0060] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 48 to 100 parts of filler, specifically 48, 50, 55, 60, 65, 70, 75, 80, 85, 88, 90, 95 or 100 parts. In the present invention, the filler preferably includes one or more of barium sulfate, talcum powder and silica fume, and further preferably includes barium sulfate and / or talcum powder. In the present invention, the particle size of the filler is preferably 1250 mesh to 2000 mesh.

[0061] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 5 to 45 parts by weight of the second pigment, and is preferably 5, 10, 15, 20, 25, 30, 35, 40, 43 or 45 parts. In the present invention, the second pigment preferably includes one or more of zinc oxide, zinc phosphate, iron titanium powder and zinc chrome yellow, and the zinc oxide is preferably smelted zinc oxide. In the present invention, the particle size of the second pigment is preferably 300 mesh to 1250 mesh.

[0062] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 2 to 15 parts of a dispersant, specifically 2 parts, 3 parts, 5 parts, 6 parts, 8 parts, 10 parts, 13 parts or 15 parts. In the present invention, the dispersant preferably includes an acid-modified polymer, and the acid-modified polymer preferably includes a carboxylic acid-modified polyurethane. In the present invention, the model of the carboxylic acid-modified polyurethane is preferably 7211 purchased from Wuxi Yishen Chemical Company, 108 purchased from Wuxi Yishen Chemical Company or YS2007 purchased from Wuxi Yishen Chemical Company.

[0063] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 30 to 66 parts by weight of the first solvent, specifically 30, 35, 40, 45, 50, 55, 60, 65 or 66 parts. In the present invention, the first solvent preferably includes one or more of ethylene glycol diacetate (EGDA), propylene glycol methyl ether acetate (PMA) and diethylene glycol butyl ether.

[0064] In the present invention, based on the weight of the bio-based hyperbranched resin, the component A includes 3 to 50 parts of an auxiliary agent, specifically 3, 5, 9, 10, 15, 20, 25, 30, 35, 40, 45 or 50 parts. In the present invention, the auxiliary agent preferably includes a defoamer and / or a leveling agent, and further preferably includes a defoamer and a leveling agent. The weight ratio of the defoamer and the leveling agent is preferably 1:1 to 2:1, specifically 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1 or 2:1. In the present invention, the defoamer preferably includes one or more of a non-silicone polymer, a fluorine-modified silicone and a silicone polymer. In the present invention, the model of the non-silicone polymer is preferably YS5500 purchased from Wuxi Yishen Chemical Company, YS5230 purchased from Wuxi Yishen Chemical Company, or YS5360 purchased from Wuxi Yishen Chemical Company. In the present invention, the specific model of the fluorine-modified silicone is preferably YS630, YS650 or YS660. In the present invention, the specific model of the silicone polymer is preferably YS6401 purchased from Wuxi Yishen Chemical Company, YS6405 purchased from Wuxi Yishen Chemical Company, or YS6403 purchased from Wuxi Yishen Chemical Company.

[0065] In the present invention, the leveling agent preferably includes one or more of an acrylate copolymer, a fluorine-modified acrylate copolymer and a polyether-modified siloxane. In the present invention, the specific model of the acrylate copolymer is preferably YS3001 purchased from Wuxi Yishen Chemical Company, YS3683 purchased from Wuxi Yishen Chemical Company or YS3677 purchased from Wuxi Yishen Chemical Company. In the present invention, the specific model of the fluorine-modified acrylate copolymer is preferably YS3377 purchased from Wuxi Yishen Chemical Company or YS3399 purchased from Wuxi Yishen Chemical Company. In the present invention, the specific model of the polyether-modified siloxane is preferably YS5500 purchased from Wuxi Yishen Chemical Company or YS6401 purchased from Wuxi Yishen Chemical Company.

[0066] The bio-based coating provided by the present invention comprises a component B, wherein the component B comprises the following components in parts by weight: 100 parts of isocyanate and 5 to 33 parts of a second solvent.

[0067] In the present invention, the component B includes 100 parts by weight of isocyanate, and the isocyanate preferably includes one or more of toluene-2,4-diisocyanate (TDI), hexamethylene diisocyanate (HDI) and 4,4'-methylenebis(phenyl isocyanate) (MDI). In the present invention, the model of the toluene-2,4-diisocyanate is preferably T-75E. In the present invention, the model of the hexamethylene diisocyanate is preferably HT-100.

[0068] In the present invention, based on the weight of the isocyanate, the second component includes 5 to 33 parts by weight of the second solvent, specifically 5 parts, 10 parts, 15 parts, 16 parts, 20 parts, 25 parts, 30 parts or 33 parts. In the present invention, the second solvent preferably includes one or more of ethylene glycol diacetate (EGDA), propylene glycol methyl ether acetate (PMA) and diethylene glycol butyl ether.

[0069] In the present invention, the weight ratio of component A to component B is 3:1.

[0070] The present invention also provides a method for preparing the bio-based coating described in the above technical solution, comprising the following steps:

[0071] The bio-based hyperbranched resin, the first pigment, the filler, the second pigment and the dispersant are sequentially mixed, dispersed and ground to obtain a premix;

[0072] Mixing the premix, the first solvent and the auxiliary agent to obtain the component A;

[0073] The isocyanate and the second solvent are mixed to obtain the second component.

[0074] The invention sequentially mixes, disperses and grinds the bio-based hyperbranched resin, the first pigment, the filler, the second pigment and the dispersant to obtain a premix.

[0075] In the present invention, the rotation speed of the mixing and dispersing is preferably 1000-1200 r / min, and the time is preferably 60 min.

[0076] In the present invention, the fineness of the premix is ​​preferably less than 20 μm. The present invention does not specifically limit the grinding parameters, as long as the fineness of the premix is ​​less than 20 μm.

[0077] After obtaining the premix, the present invention mixes the premix, the first solvent and the auxiliary agent to obtain the component A.

[0078] The present invention does not impose any specific limitation on the mixing parameters, as long as the materials can be fully mixed.

[0079] In the present invention, isocyanate and a second solvent are mixed to obtain the component B.

[0080] The present invention does not impose any specific limitation on the mixing parameters, as long as the materials can be fully mixed.

[0081] The present invention also provides the use of the bio-based coating described in the above technical solution in ship protection.

[0082] In the present invention, when the bio-based coating is applied to ship protection, it preferably includes the following steps:

[0083] The surface of the ship is sanded, and then the bio-based coating is sprayed and cured.

[0084] In the present invention, the material of the ship surface is stainless steel, carbon steel or aluminum profile. The present invention does not specifically limit the parameters of the polishing, as long as the bio-based coating can be sprayed.

[0085] In the present invention, the curing parameters are preferably described in the following application method section and will not be repeated here.

[0086] The present invention also provides an application method of the bio-based coating described in the above technical solution, comprising the following steps:

[0087] Mix component A and component B and cure.

[0088] In the present invention, the curing temperature is -4 to 40°C and the curing time is 15 to 24 hours.

[0089] The bio-based coating provided by the present invention and its preparation method, application and application method are described in detail below in conjunction with the embodiments, but they should not be understood as limiting the scope of protection of the present invention.

[0090] Example 1

[0091] The preparation method of the bio-based hyperbranched resin comprises:

[0092] Soybean oil, linseed oil, tung oil and castor oil are mixed in a weight ratio of 3:3:1:3, and then mixed with a polyol (the polyol is specifically neopentyl glycol, wherein the ratio of the total amount of soybean oil, linseed oil, tung oil and castor oil to the amount of polyol is 3.4:1) and put into a four-necked flask in proportion, and after high-temperature alcoholysis at 240°C for 4 hours, an alcoholysis system is obtained; an acidic substance (specifically phthalic anhydride and benzoic acid, the amount of phthalic anhydride and benzoic acid ratio is 9:1, and the amount of polyol and acidic substance ratio is 1.5:1) is added to the alcoholysis system, and an ester exchange reaction is carried out at 225°C for 5 hours to obtain a bio-based hyperbranched resin.

[0093] A bio-based coating comprises a component A and a component B;

[0094] Wherein, component A comprises the following components in parts by weight:

[0095] 100 parts of bio-based hyperbranched resin, 70 parts of the first pigment (titanium dioxide, particle size of 800-1000 mesh), 75 parts of filler (barium sulfate (particle size of 1250-2000 mesh) and talcum powder (particle size of 1250-2000 mesh), the weight ratio of barium sulfate to talcum powder is 7:3), 75 parts of the second pigment (iron titanium powder (particle size of 600-800 mesh) and zinc phosphate (particle size of 600-800 mesh), iron The weight ratio of titanium powder to zinc phosphate is 6:4), 40 parts, dispersant (the dispersant is specifically purchased from Wuxi Yishen Chemical Company with model number YS-2007) 2 parts, the first solvent (specifically PMA) 45 parts, defoaming agent (the defoaming agent is specifically purchased from Wuxi Yishen Chemical Company with model number YS5500) 1.5 parts, and leveling agent (the leveling agent is specifically purchased from Wuxi Yishen Chemical Company with model number YS3377) 1.5 parts.

[0096] Component B includes the following components in parts by weight: 100 parts of isocyanate (specifically, the isocyanate is T-75E and HT-100, and the weight ratio of T-75E and HT-100 is 8:25) and 15 parts of the second solvent (specifically, the second solvent is EGDA).

[0097] The weight ratio of component A to component B is 3:1.

[0098] Example 2

[0099] The preparation method of bio-based hyperbranched resin is:

[0100] Soybean oil, linseed oil, tung oil and castor oil are mixed in a weight ratio of 3:3:1:2, and then mixed with a polyol (the polyol is specifically trimethylolpropane, wherein the ratio of the total amount of soybean oil, linseed oil, tung oil and castor oil to the amount of polyol is 3.8:1) and put into a four-necked flask in proportion, and after alcoholysis at high temperature of 240°C for 3 hours, an alcoholysis system is obtained; an acidic substance is added to the alcoholysis system (the acidic substance is specifically phthalic anhydride, and the ratio of the amount of polyol to the acidic substance is 1.8:1), and an ester exchange reaction is carried out at 220°C for 6 hours to obtain a bio-based hyperbranched resin.

[0101] A bio-based coating for a ship surface: comprising a component A and a component B;

[0102] Wherein, component A comprises the following components in parts by weight:

[0103] 100 parts of a bio-based hyperbranched resin, 80 parts of a first pigment (the first pigment is specifically titanium dioxide (particle size of 800-1000 mesh) and phthalocyanine blue (particle size of 800-1000 mesh), and the mass ratio of titanium dioxide to phthalocyanine blue is 10:6), 100 parts of a filler (the filler is specifically barium sulfate (particle size of 1250-2000 mesh) and talc (particle size of 1250-2000 mesh), and the mass ratio of barium sulfate to talc is 2:1), and 100 parts of a second pigment (the second The pigment is specifically zinc phosphate with a particle size of 600-800 mesh) 20 parts, a dispersant (the dispersant is specifically purchased from Wuxi Yishen Chemical Company, model 7211) 3 parts, a first solvent (the first solvent is specifically EGDA) 40 parts, a defoamer (the defoamer is specifically purchased from Wuxi Yishen Chemical Company, model Wuxi Yishen Chemical YS5500) 3 parts, a leveling agent (the leveling agent is specifically purchased from Wuxi Yishen Chemical Company, model Wuxi Yishen Chemical YS3399) 2 parts.

[0104] Component B includes the following components in parts by weight: 100 parts of isocyanate (the models of isocyanate are T-75E and HT-100, and the weight ratio of T-75E and HT-100 is 8:25), and 20 parts of the second solvent (the second solvent is specifically EGDA).

[0105] The weight ratio of component A to component B is 3:1.

[0106] Example 3

[0107] The preparation method of bio-based hyperbranched resin is:

[0108] Soybean oil, linseed oil, tung oil and castor oil are mixed in a weight ratio of 3:3:1:3, and then mixed with a polyol (the polyol is specifically trimethylolpropane, wherein the ratio of the total amount of soybean oil, linseed oil, tung oil and castor oil to the amount of polyol is 3.6:1) and put into a four-necked flask in proportion, and after alcoholysis at high temperature of 240°C for 3 hours, an alcoholysis system is obtained; an acidic substance is added to the alcoholysis system (the acidic substance is specifically phthalic anhydride, and the ratio of the amount of polyol to the acidic substance is 1.6:1), and an ester exchange reaction is carried out at 230°C for 4 hours to obtain a bio-based hyperbranched resin.

[0109] A bio-based coating for a ship surface: comprising a component A and a component B;

[0110] Wherein, component A comprises the following components in parts by weight:

[0111] 100 parts of bio-based hyperbranched resin, 63 parts of a first pigment (the first pigment is specifically titanium dioxide (particle size is 800-1000 mesh) and carbon black (particle size is 100-200 mesh), and the mass ratio of titanium dioxide to carbon black is 10:1), 88 parts of a filler (the filler is specifically barium sulfate (particle size is 1250-2000 mesh)), and 88 parts of a second pigment (the second pigment is specifically smelted zinc oxide (particle size is 325-600 mesh), zinc phosphate (particle size is 600-800 mesh) and zinc chrome yellow (particle size is 6 00~800 mesh), smelted zinc oxide, zinc phosphate and zinc chrome yellow in a mass ratio of 2:3:3) 43 parts, dispersant (the dispersant is specifically purchased from Wuxi Yishen Chemical Company, model Wuxi Yishen Chemical 7211) 15 parts, the first solvent (the first solvent is specifically EGDA) 40 parts, defoamer (the defoamer is specifically purchased from Wuxi Yishen Chemical Company, model YS660) 1.5 parts, leveling agent (the leveling agent is specifically purchased from Wuxi Yishen Chemical Company, model YS3377) 1.5 parts.

[0112] Component B includes the following components in parts by weight: 100 parts of isocyanate (specifically, the isocyanate is T-75E and HT-100, and the weight ratio of T-75E and HT-100 is 8:25) and 5 parts of the second solvent (specifically, the second solvent is DGEA).

[0113] The weight ratio of component A to component B is 3:1.

[0114] Example 4

[0115] The preparation method of bio-based hyperbranched resin is:

[0116] Soybean oil, linseed oil, tung oil and castor oil are mixed in a weight ratio of 3:3:1.5:3, and then mixed with a polyol (the polyol is specifically trimethylolpropane, wherein the ratio of the total amount of soybean oil, linseed oil, tung oil and castor oil to the amount of polyol is 3.4:1) and put into a four-necked flask in proportion, and after high-temperature alcoholysis at 240°C for 4 hours, an alcoholysis system is obtained; an acidic substance is added to the alcoholysis system (the acidic substance is specifically phthalic anhydride and benzoic acid, the amount of phthalic anhydride and benzoic acid is 10:1, and the amount of polyol and the acidic substance is 1.5:1), and an ester exchange reaction is carried out at 225°C for 5 hours to obtain a bio-based hyperbranched resin.

[0117] A bio-based coating for a ship surface: comprising a component A and a component B;

[0118] Wherein, component A comprises the following components in parts by weight:

[0119] 100 parts of bio-based hyperbranched resin, 75 parts of a first pigment (the first pigment is specifically titanium dioxide (particle size of 800-1000 mesh) and phthalocyanine blue (particle size of 800-1000 mesh), and the weight ratio of titanium dioxide to phthalocyanine blue is 2:1), 90 parts of a filler (the filler is specifically barium sulfate with a particle size of 1250-2000 mesh), 15 parts of a second pigment (the second pigment is specifically zinc phosphate with a particle size of 600-800 mesh), 6 parts of a dispersant (the dispersant is specifically purchased from Wuxi Yishen Chemical Company, model 7211), 40 parts of a first solvent (the first solvent is specifically EGDA), 6 parts of a defoamer (the defoamer is specifically purchased from Wuxi Yishen Chemical Company, model YS5500), and 3 parts of a leveling agent (the leveling agent is specifically purchased from Wuxi Yishen Chemical Company, model YS3377).

[0120] Component B includes the following components in parts by weight: 100 parts of isocyanate (specifically, the isocyanate is T-75E and HT-100, and the weight ratio of T-75E and HT-100 is 8:25), and 16 parts of the second solvent (specifically, the second solvent is EGDA).

[0121] The weight ratio of component A to component B is 3:1.

[0122] Example 5

[0123] The preparation method of bio-based hyperbranched resin is:

[0124] Soybean oil, linseed oil, tung oil and castor oil are mixed in a weight ratio of 3:1:3:3, and then mixed with a polyol (the polyol is specifically pentaerythritol, wherein the ratio of the total amount of soybean oil, linseed oil, tung oil and castor oil to the amount of the polyol is 3.6:1) and put into a four-necked flask in proportion, and after high-temperature alcoholysis at 240°C for 4 hours, an alcoholysis system is obtained; an acidic substance is added to the alcoholysis system (the acidic substance is specifically phthalic anhydride and benzoic acid, the amount of phthalic anhydride and benzoic acid is 8:1, and the amount of the polyol and the acidic substance is 1.8:1), and an ester exchange reaction is carried out at 220°C for 6 hours to obtain a bio-based hyperbranched resin.

[0125] A bio-based coating for a ship surface: comprising a component A and a component B;

[0126] Wherein, component A comprises the following components in parts by weight:

[0127] 100 parts of bio-based hyperbranched resin, 75 parts of a first pigment (the pigment is specifically medium yellow chrome (particle size is 800-1000 mesh)), 85 parts of a filler (the filler is specifically barium sulfate with a particle size of 1250-2000 mesh), 30 parts of a second pigment (the second pigment is specifically zinc chrome yellow with a particle size of 600-800 mesh), 10 parts of a dispersant (the dispersant is specifically a carboxylic acid-modified polyurethane purchased from Wuxi Yishen Chemical Company with a model number of 7211), 35 parts of a first solvent (the first solvent is specifically PMA), 6 parts of a defoamer (the defoamer is specifically purchased from Wuxi Yishen Chemical Company with a model number of YS5500), and 4 parts of a leveling agent (the leveling agent is specifically purchased from Wuxi Yishen Chemical Company with a model number of YS3377).

[0128] Component B includes the following components in parts by weight: 100 parts of isocyanate (specifically, the isocyanate is T-75E and HT-100, and the weight ratio of T-75E and HT-100 is 8:25) and 30 parts of the second solvent (specifically, the second solvent is EGDA).

[0129] The weight ratio of component A to component B is 3:1.

[0130] Comparative Example 1

[0131] The difference from Example 1 is that the bio-based hyperbranched resin is replaced by an alkyd resin.

[0132] The VOC content of the obtained coating was determined by the GB / T23985-2009 method. The corrosion resistance, weather resistance, acid and alkali resistance and salt spray resistance of the obtained coating were determined by the GB / T1865-2009 method. The results are shown in Table 1.

[0133] Table 1 Performance test results of the coatings obtained in the examples and comparative examples

[0134]

[0135] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bio-based coating, characterized in that: It includes component A and component B; The component A comprises the following components in parts by weight: 100 parts of bio-based hyperbranched resin, 20-85 parts of first pigment, 48-100 parts of filler, 5-45 parts of second pigment, 2-15 parts of dispersant, 30-66 parts of first solvent, 3-50 parts of auxiliary agent; The component B comprises the following components in parts by weight: 100 parts of isocyanate, 5 to 33 parts of the second solvent; The preparation method of the bio-based hyperbranched resin comprises the following steps: The vegetable oil and the polyol are mixed and alcoholyzed to obtain an alcoholysis system; The alcoholysis system and the acidic substance are mixed to carry out an ester exchange reaction to obtain the bio-based hyperbranched resin; The vegetable oils include soybean oil, linseed oil, tung oil and castor oil; The polyol includes one or more of neopentyl glycol, trimethylolpropane, pentaerythritol, glycerol and ethylene glycol; The acidic substance includes one or more of carboxylic acid and acid anhydride, the carboxylic acid includes benzoic acid, and the acid anhydride includes phthalic anhydride and / or maleic anhydride; The weight ratio of component A to component B is 3:

1.

2. The bio-based coating according to claim 1, characterized in that The weight ratio of soybean oil, linseed oil, tung oil and castor oil is 2-4:1-3:1-3:2-4; The molar ratio of the vegetable oil to the polyol is 3 to 4:1; The alcoholysis temperature is 235-245°C and the time is 2-4h; The molar ratio of the polyol to the acidic substance is 1 to 2:1; The temperature of the transesterification reaction is 210-230° C., and the time is 4-12 hours.

3. The bio-based coating according to claim 1, characterized in that The first pigment includes one or more of titanium dioxide, phthalocyanine blue, medium chrome yellow and carbon black; The filler includes one or more of barium sulfate, talcum powder and silica fume; The second pigment includes one or more of zinc oxide, zinc phosphate, iron titanium powder and zinc chrome yellow.

4. The bio-based coating according to claim 1, characterized in that The dispersant includes an acid-modified polymer, and the acid-modified polymer includes a carboxylic acid-modified polyurethane.

5. The bio-based coating according to claim 1, characterized in that The first solvent includes one or more of ethylene glycol diacetate, propylene glycol methyl ether acetate and diethylene glycol butyl ether.

6. The bio-based coating according to claim 1, characterized in that The auxiliary agent includes a defoamer and / or a leveling agent; the defoamer includes one or more of a non-silicone polymer, a fluorine-modified silicone and a silicone polymer; the leveling agent includes one or more of a modified acrylate copolymer, a fluorine-modified acrylate copolymer and a polyether-modified siloxane.

7. The bio-based coating according to claim 1, characterized in that The isocyanate includes one or more of toluene-2,4-diisocyanate, hexamethylene diisocyanate and 4,4'-methylenebis(phenyl isocyanate); the second solvent includes one or more of ethylene glycol diacetate, propylene glycol methyl ether acetate and diethylene glycol butyl ether.

8. The method for preparing the bio-based coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: The bio-based hyperbranched resin, the first pigment, the filler, the second pigment and the dispersant are sequentially mixed, dispersed and ground to obtain a premix; Mixing the premix, the first solvent and the auxiliary agent to obtain the component A; The isocyanate and the second solvent are mixed to obtain the second component.

9. Use of the bio-based coating according to any one of claims 1 to 7 in ship protection.

10. The method for applying the bio-based coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: Mix component A and component B and cure; The curing temperature is -4 to 40°C and the curing time is 15 to 24 hours.

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