Self-spraying polyurethane waterproof anticorrosive coating and preparation method thereof

Abstract

The application discloses a self-spraying polyurethane waterproof anticorrosive coating and a preparation method thereof. The raw material of the coating comprises polyether polyamine, primary hydroxyl polyether resin, maleic acid, a catalyst, an additive and a solvent. The method for preparing the coating is used to obtain the self-spraying polyurethane waterproof anticorrosive coating. Compared with the prior art, the raw material molecules are crosslinked to form a network structure under the conditions of stepwise cooling and negative pressure, so that the water impermeability of the coating is improved, the surface dry time of the coating is shortened to 1-2h, and the real dry time is shortened to 2h.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a self-spraying polyurethane waterproof anticorrosive coating and a preparation method thereof. BACKGROUND

[0002] The full name of polyurethane is polyurethane, and the main chain contains -NHCOO- repeating structural units. Polyurethane waterproof anticorrosive coating has the characteristics of excellent physical properties and waterproof effect, and overcomes the shortcomings of asphalt waterproof coating and coiled material, so it is often used for building waterproofing, damp-proofing, plugging and other work, and also used for coating work of airplanes, ships and vehicles. According to statistics, at present, polyurethane waterproof material accounts for more than 70% of the total amount of waterproof materials in China.

[0003] However, the polyurethane waterproof coating on the market still has many defects:

[0004] First, the drying and curing speed is not fast, and the surface drying time and the real drying time are long, which causes many inconveniences in the use process. For example, CN116970339A discloses a single-component self-cleaning polyurethane waterproof coating and a preparation method thereof. The coating is made of 20-40 parts of castor oil-based polyoxybutylene ether polyol, 60-80 parts of hydroxyl-terminated fluorine-containing silicon segment polyurethane modified polymer, 20-30 parts of filler, 20-30 parts of plasticizer, 1.5-4 parts of small molecule alcohol, 8.5-9.2 parts of isocyanate, 0.11-0.12 parts of catalyst and 2.501-2.602 parts of additive. The surface drying time of the coating is 9.6-9.9h, which indicates that the drying and curing time of the coating is relatively long. Second, the corrosion resistance is poor. Third, it is mostly filled, and the coating is applied by roller coating during use, which is not convenient to use. SUMMARY

[0005] The purpose of the present application is to provide a self-spraying polyurethane waterproof anticorrosive coating and a preparation method thereof, which aims to overcome the defects of long surface drying time and real drying time of the existing polyurethane waterproof coating, poor corrosion resistance and inconvenient use.

[0006] A self-spraying polyurethane waterproof anticorrosive coating, the raw materials of the coating include polyether polyamine, primary hydroxyl polyether resin, maleic acid, catalyst, additive and solvent.

[0007] According to the above technical solution, the additive is a defoaming agent, a dispersing agent and a coupling agent, wherein the coupling agent is a silane coupling agent such as vinyl silane, amino silane and methacryloyloxy silane. The coupling agent contains an inorganic material-reactive inorganic material group and an organic material-reactive organic material group, which improves the interface interaction between inorganic materials and organic materials, thereby greatly improving the physical and chemical properties of the coating.

[0008] Preferably, in the technical scheme, the raw material of the paint further comprises hydroxyl-terminated polybutadiene and cyclohexane dimethylene diisocyanate.

[0009] Preferably, in the technical scheme, the molecular weight of the polyether polyamine is 430-5000.

[0010] Preferably, in the technical scheme, the polyether polyamine comprises one or more of polyether amine D-400, polyether amine T-403, polyether amine T-3000 and polyether amine T-4000.

[0011] Preferably, in the technical scheme, the molecular weight of the primary hydroxyl polyether resin is 2000-6000.

[0012] According to the technical scheme, the molecular weight of the primary hydroxyl polyether resin is limited to 2000-6000, and the primary hydroxyl polyether resin with the chain length is used as the raw material, which is the best for the curing speed and viscosity of the obtained polyurethane paint.

[0013] Preferably, in the technical scheme, the catalyst comprises one or more of dibutyl tin dilaurate, bismuth octoate and stannous octoate.

[0014] Preferably, in the technical scheme, the raw material of the paint comprises, by weight, 10-26 kg of polyether polyamine, 120-240 kg of primary hydroxyl polyether resin, 10-30 kg of maleic acid, 30-80 kg of hydroxyl-terminated polybutadiene, 30-75 kg of cyclohexane dimethylene diisocyanate, 6-1.5 kg of catalyst, 3-6 kg of auxiliary agent and 10-40 kg of solvent.

[0015] A preparation method of the self-spraying polyurethane waterproof and anticorrosive paint is provided.

[0016] S1, the polyether polyamine, the primary hydroxyl polyether resin, the maleic acid and the hydroxyl-terminated polybutadiene are placed in a reaction kettle and mixed and reacted under the conditions of a temperature of 100-130℃ and negative pressure;

[0017] S2, when the reaction kettle is cooled to 70-85℃, the cyclohexane dimethylene diisocyanate is added into the reaction kettle and reacted;

[0018] S3, when the reaction kettle is cooled to 55-60℃, the catalyst is added into the reaction kettle and stirred uniformly, the auxiliary agent is added and stirred uniformly, and the solvent is added and stirred uniformly, to obtain the polyurethane waterproof and anticorrosive paint;

[0019] S4, the polyurethane waterproof and anticorrosive paint is cooled to room temperature, the polyurethane waterproof and anticorrosive paint is injected into a self-spraying bottle together with a preset gas, to obtain the self-spraying polyurethane waterproof and anticorrosive paint.

[0020] Preferably, in the technical solution, the preset gas is nitrogen or propane.

[0021] Preferably, in the technical solution, in the step S1, the mixing reaction under the temperature of 100-130 DEG C and the negative pressure condition is specifically as follows: the reaction kettle is heated to 100-130 DEG C, the negative pressure vacuum machine is started to vacuum to the negative pressure of 0.08-0.1 MPa, and the reaction is treated under the condition of constant temperature and the negative pressure of 0.08-0.1 MPa for 1-2 h.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The principle of the self-jet polyurethane waterproof and anticorrosive coating prepared by the method is as follows: (1) the polyether polyamine, primary hydroxyl polyether resin, maleic acid and hydroxyl-terminated polybutadiene are crosslinked under certain temperature conditions, so that the correlation between the molecular chains of the polyether polyamine, primary hydroxyl polyether resin and the like is enhanced while the original main chain and crystal structure are maintained, the toughness and ductility of the coating are improved, the tensile strength of the coating after film formation is enhanced, the network structure is formed through crosslinking to improve the anticorrosion and waterproof effects; (2) the cyclohexane dimethylene diisocyanate is added to increase the NCO bond content of the polyurethane coating, promote the curing and film formation of the components in the polyurethane coating, and prevent the problem of edge lifting or edge curling of the coating surface after curing; (3) the catalyst is selected by combining multiple components, the dibutyltin dilaurate is avoided to reduce the anti-aging performance of the polyurethane coating, the generation of CO2 is reduced, the probability of rough surface of the coating after coating is reduced, and the reaction and curing of the polyurethane coating are accelerated. DETAILED DESCRIPTION

[0024] The terms first, second, third, etc. are used to describe various portions, components, regions, layers and / or segments, but these portions, components, regions, layers and / or segments should not be limited by these terms. These terms are only used to distinguish a certain portion, component, region, layer and / or segment from another portion, component, region, layer and / or segment. Therefore, the first portion, component, region, layer and / or segment described below can also be described as the second portion, component, region, layer and / or segment without departing from the scope of the present application.

[0025] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless the context clearly indicates otherwise, the singular form used herein is also intended to include the plural form. It should also be understood that the term "comprising" specifically refers to a certain feature, field, integer, step, action, element and / or component, but does not exclude the presence or addition of other features, fields, integers, steps, actions, elements, components and / or groups.

[0026] Although not otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. For terms defined in dictionaries, those terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0027] The raw materials used in the present application are as follows:

[0028] The primary hydroxyl polyether resin TDB-6000 is purchased from Shandong Lansheng Dongda Chemical Co., Ltd., the polyether amine T-3000 is purchased from Shandong Lansheng Dongda Chemical Co., Ltd., the hydroxyl-terminated polybutadiene is purchased from Guangdong Shenzhen Tianyuan Polymer Materials, the maleic acid is purchased from Guangzhou Niu Long Chemical Co., Ltd., the cyclohexane dimethylene diisocyanate H-XDI is purchased from Yantai Wanhua Chemical Group Co., Ltd., and other materials are commercially available. Embodiment

[0029] A self-spraying polyurethane waterproof and anticorrosive coating, the raw materials of the coating include, by weight, 26 kg of polyether polyamine (polyether amine D-400), 120 kg of primary hydroxyl polyether resin, 10 kg of maleic acid, 30 kg of hydroxyl-terminated polybutadiene, 35 kg of cyclohexane dimethylene diisocyanate, 1.2 kg of catalyst (bismuth isooctoate and dibutyltin dilaurate), 2 kg of auxiliary agent (defoaming agent, dispersant, coupling agent) and 20 kg of solvent (benzene solvent such as benzyl alcohol), wherein the molecular weight of the primary hydroxyl polyether resin is 2000-6000, and the molecular weight of the polyether polyamine is 430-5000.

[0030] A preparation method of a self-spraying polyurethane waterproof and anticorrosive coating as described above, the specific steps of the preparation method are as follows:

[0031] S1, take the polyether polyamine, primary hydroxyl polyether resin, maleic acid and hydroxyl-terminated polybutadiene into a reaction kettle, heat the reaction kettle to 110℃, start the vacuum pump to perform vacuumization until the environment in the reaction kettle is negative pressure 0.1 MPa, and react for 1.5 h;

[0032] S2, when the reaction kettle is cooled to 80℃, add cyclohexane dimethylene diisocyanate into the reaction kettle, and react for 2.5 h under the condition of 80℃ and negative pressure 0.1 MPa;

[0033] S3, when the reaction kettle is cooled to 60℃, add the catalyst dibutyltin dilaurate and bismuth isooctoate into the reaction kettle and stir uniformly, then add the defoaming agent, dispersant and coupling agent and stir uniformly, add the ester solvent and stir uniformly, and obtain the polyurethane waterproof and anticorrosive coating;

[0034] S4, cooling the polyurethane waterproof anticorrosive coating to room temperature, injecting the polyurethane waterproof anticorrosive coating and nitrogen into a self-spraying bottle to obtain a self-spraying polyurethane waterproof anticorrosive coating. Embodiment

[0035] A self-spraying polyurethane waterproof anticorrosive coating, raw materials of the coating include, by weight: 40 kg of polyether polyamine (polyether amine T-403), 180 kg of primary hydroxyl polyether resin, 14 kg of maleic acid, 45 kg of hydroxyl-terminated polybutadiene, 40 kg of cyclohexane dimethylene diisocyanate, 1.6 kg of catalyst (dibutyltin dilaurate and stannous octoate), 4 kg of auxiliary agent (defoamer, dispersant, coupling agent), and 15 kg of solvent (ester solvent such as diacid ester).

[0036] A preparation method of the self-spraying polyurethane waterproof anticorrosive coating as described above, and specific steps of the preparation method are as follows:

[0037] S1, taking polyether polyamine, primary hydroxyl polyether resin, maleic acid and hydroxyl-terminated polybutadiene into a reaction kettle, heating and warming the reaction kettle to 120℃, starting a negative pressure vacuum machine to perform vacuum extraction until the environment in the reaction kettle is negative 0.08 MPa, and reacting for 1 h;

[0038] S2, when the reaction kettle is cooled to 85℃, adding cyclohexane dimethylene diisocyanate into the reaction kettle, and reacting for 2.5 h under the condition of 85℃ and negative pressure 0.08 MPa;

[0039] S3, when the reaction kettle is cooled to 60℃, adding catalyst dibutyltin dilaurate and stannous octoate into the reaction kettle to stir uniformly, then adding defoamer, dispersant and coupling agent to stir uniformly, and adding ester solvent to stir uniformly to obtain a polyurethane waterproof anticorrosive coating;

[0040] S4, cooling the polyurethane waterproof anticorrosive coating to room temperature, injecting the polyurethane waterproof anticorrosive coating and nitrogen into a self-spraying bottle to obtain a self-spraying polyurethane waterproof anticorrosive coating. Embodiment

[0041] A self-spraying polyurethane waterproof anticorrosive coating, raw materials of the coating include, by weight: 40 kg of polyether polyamine (polyether amine T-403), 180 kg of primary hydroxyl polyether resin, 14 kg of maleic acid, 45 kg of hydroxyl-terminated polybutadiene, 40 kg of cyclohexane dimethylene diisocyanate, 1.6 kg of catalyst (dibutyltin dilaurate and stannous octoate), 4 kg of auxiliary agent (defoamer, dispersant, coupling agent), and 15 kg of solvent (ester solvent such as diacid ester).

[0042] A preparation method of the self-spraying polyurethane waterproof anticorrosive coating as described above, and specific steps of the preparation method are as follows:

[0043] S1, take polyether polyamine, primary hydroxyl polyether resin, maleic acid and hydroxyl-terminated polybutadiene into a reaction kettle, heat the reaction kettle to 100℃, start the vacuum pump to vacuumize the reaction kettle to negative pressure 0.09 MPa, and react for 2 hours;

[0044] S2, when the reaction kettle is cooled to 70℃, cyclohexane dimethylene diisocyanate is added into the reaction kettle, and reacts for 3 hours under the condition of 70℃ and negative pressure 0.09 MPa;

[0045] S3, when the reaction kettle is cooled to 55℃, the catalysts bismuth octoate and stannous octoate are added into the reaction kettle and stirred uniformly, then the defoaming agent, dispersing agent and coupling agent are stirred uniformly, and the ester solvent is added and stirred uniformly, to obtain the polyurethane waterproof and anticorrosive coating;

[0046] S4, the polyurethane waterproof and anticorrosive coating is cooled to room temperature, and the polyurethane waterproof and anticorrosive coating is injected into a self-spraying bottle with nitrogen, to obtain the self-spraying polyurethane waterproof and anticorrosive coating. Embodiment

[0047] A self-spraying polyurethane waterproof and anticorrosive coating, the raw materials of the coating include, by weight, 50 kg of polyether polyamine (polyether amine T-4000), 240 kg of primary hydroxyl polyether resin, 20 kg of maleic acid, 60 kg of hydroxyl-terminated polybutadiene, 75 kg of cyclohexane dimethylene diisocyanate, 1.8 kg of catalysts (bismuth octoate, stannous octoate and dibutyltin dilaurate), 5 kg of additives (defoaming agent, dispersing agent and coupling agent), and 5 kg of solvent (hydrocarbon solvent such as toluene).

[0048] A preparation method of the self-spraying polyurethane waterproof and anticorrosive coating as described above, and the specific steps of the preparation method are as follows:

[0049] S1, take polyether polyamine, primary hydroxyl polyether resin, maleic acid and hydroxyl-terminated polybutadiene into a reaction kettle, heat the reaction kettle to 110℃, start the vacuum pump to vacuumize the reaction kettle to negative pressure 0.1 MPa, and react for 2 hours;

[0050] S2, when the reaction kettle is cooled to 75℃, cyclohexane dimethylene diisocyanate is added into the reaction kettle, and reacts for 3 hours under the condition of 85℃ and negative pressure 0.1 MPa;

[0051] S3, when the reaction kettle is cooled to 58℃, the catalysts bismuth octoate, stannous octoate and dibutyltin dilaurate are added into the reaction kettle and stirred uniformly, then the defoaming agent, dispersing agent and coupling agent are stirred uniformly, and the ester solvent is added and stirred uniformly, to obtain the polyurethane waterproof and anticorrosive coating;

[0052] S4, cooling the polyurethane waterproof anticorrosive paint to room temperature, injecting the polyurethane waterproof anticorrosive paint and propane into a self-spraying bottle to obtain a self-spraying polyurethane waterproof anticorrosive paint.

[0053] Comparative Example 1

[0054] The same as Example 1, the difference is that maleic acid and cyclohexane dimethylene diisocyanate are absent. A self-spraying polyurethane waterproof anticorrosive paint, by weight, raw materials of the paint include: 26 kg polyether polyamine, 120 kg primary hydroxyl polyether resin, 30 kg hydroxyl-terminated polybutadiene, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0055] Comparative Example 2

[0056] The same as Example 1, the difference is that hydroxyl-terminated polybutadiene, maleic acid and primary hydroxyl polyether resin are absent. A self-spraying polyurethane waterproof anticorrosive paint, by weight, raw materials of the paint include: 26 kg polyether polyamine, 35 kg cyclohexane dimethylene diisocyanate, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0057] Comparative Example 3

[0058] The same as Example 1, the difference is that cyclohexane dimethylene diisocyanate and hydroxyl-terminated polybutadiene are absent. A self-spraying polyurethane waterproof anticorrosive paint, by weight, raw materials of the paint include: 26 kg polyether polyamine, 120 kg primary hydroxyl polyether resin, 10 kg maleic acid, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0059] Comparative Example 4

[0060] The same as Example 1, the difference is that primary hydroxyl polyether resin and hydroxyl-terminated polybutadiene are absent. A self-spraying polyurethane waterproof anticorrosive paint, by weight, raw materials of the paint include: 26 kg polyether polyamine, 10 kg maleic acid, 35 kg cyclohexane dimethylene diisocyanate, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0061] Comparative Example 5

[0062] The same as example 1, the difference is that the primary hydroxyl polyether resin and maleic acid are absent. A self-spraying polyurethane waterproof anticorrosive coating, the raw materials of the coating include, by weight: 26 kg polyether polyamine, 30 kg hydroxyl-terminated polybutadiene, 35 kg cyclohexane dimethylene diisocyanate, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0063] Comparative example 6

[0064] The same as example 1, the difference is that the maleic acid and hydroxyl-terminated polybutadiene are absent. A self-spraying polyurethane waterproof anticorrosive coating, the raw materials of the coating include, by weight: 26 kg polyether polyamine, 120 kg primary hydroxyl polyether resin, 35 kg cyclohexane dimethylene diisocyanate, 1.2 kg catalyst, 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0065] Comparative example 7

[0066] The same as example 1, the difference is that the catalyst is dibutyltin dilaurate. A self-spraying polyurethane waterproof anticorrosive coating, the raw materials of the coating include, by weight: 26 kg polyether polyamine, 120 kg primary hydroxyl polyether resin, 10 kg maleic acid, 30 kg hydroxyl-terminated polybutadiene, 35 kg cyclohexane dimethylene diisocyanate, 1.2 kg catalyst (dibutyltin dilaurate), 2 kg auxiliary agent (defoamer, dispersant, coupling agent) and 20 kg solvent (benzyl alcohol).

[0067] Comparative example 8

[0068] The same as example 1, the difference is that the preparation method is different. A preparation method of a self-spraying polyurethane waterproof anticorrosive coating, the specific steps of the preparation method are as follows:

[0069] The polyether polyamine, the primary hydroxyl polyether resin, the maleic acid and the hydroxyl-terminated polybutadiene are placed in a reaction kettle, the reaction kettle is heated to 60℃, a vacuum pump is started to perform vacuumizing until the environment in the reaction kettle is negative pressure 0.1 MPa, and the reaction is processed for 1.5 h; the cyclohexane dimethylene diisocyanate is added into the reaction kettle to react for 2.5 h; the catalyst bismuth isooctoate and dibutyltin dilaurate are added into the reaction kettle to stir uniformly, and then the defoamer, the dispersant, the coupling agent and the ester solvent are added into the reaction kettle to stir uniformly, so as to obtain the polyurethane coating; the polyurethane coating is cooled to room temperature, the polyurethane coating is injected into a self-spraying bottle together with nitrogen, and a self-spraying polyurethane waterproof anticorrosive coating is obtained.

[0070] Comparative example 9

[0071] The difference between the embodiment 1 and the embodiment 2 is the preparation method. The preparation method of the self-spraying polyurethane waterproof and anticorrosive coating is as follows:

[0072] The polyether polyamine, the primary hydroxyl polyether resin, the maleic acid and the hydroxyl-terminated polybutadiene are placed in a reaction kettle, the reaction kettle is heated to 110℃, a vacuum pump is started to perform vacuumizing until the environment in the reaction kettle is negative pressure 0.1 MPa, and the reaction is processed for 1.5 h; the cyclohexane bismuth isooctanoate and the dibutyltin dilaurate are added into the reaction kettle and stirred uniformly, and then the defoaming agent, the dispersing agent and the coupling agent are stirred uniformly, the ester solvent is added and stirred uniformly to obtain the polyurethane coating; the polyurethane coating is cooled to room temperature, the polyurethane coating and the nitrogen are injected into a self-spraying bottle to obtain the self-spraying polyurethane waterproof and anticorrosive coating.

[0073] Comparative example 10

[0074] The difference between the embodiment 1 and the embodiment 2 is the preparation method. The preparation method of the self-spraying polyurethane waterproof and anticorrosive coating is as follows:

[0075] The polyether polyamine, the primary hydroxyl polyether resin, the maleic acid and the hydroxyl-terminated polybutadiene are placed in a reaction kettle, the reaction kettle is heated to 80℃, a vacuum pump is started to perform vacuumizing until the environment in the reaction kettle is negative pressure 0.1 MPa, and the reaction is processed for 1.5 h; the cyclohexane bismuth isooctanoate and the dibutyltin dilaurate are added into the reaction kettle and stirred uniformly, and then the defoaming agent, the dispersing agent and the coupling agent are stirred uniformly, the ester solvent is added and stirred uniformly to obtain the polyurethane coating; the polyurethane coating is cooled to room temperature, the polyurethane coating and the nitrogen are injected into a self-spraying bottle to obtain the self-spraying polyurethane waterproof and anticorrosive coating.

[0076] The performance of the self-spraying polyurethane waterproof and anticorrosive coatings of the embodiment 1-4 and the comparative example 1-10 is tested according to the national standard GB / T19250-2013 I type technical index, and the detection is performed according to the test steps of GB / T16777-2008, but the water impermeability test time is extended to 180 min.

[0077] Table 1 Basic performance of the coatings of each group

[0078] Group Solid content (%) Surface dry time (h) Real dry time (h) Tensile strength (MPa) Water impermeability Type I standard ≥92 ≤12 ≤24 ≥2.00 0.3 MPa, 120 min, water impermeable Example 1 95 1-1.5 2 4.8 Water impermeable Example 2 95 1-1.5 2 4.9 Water impermeable Example 3 96 1.5-2 2 5.1 Water impermeable Example 4 98 1.5-2 2 5.1 Water impermeable Comparative Example 1 95 6.5-7 8 4.2 Water impermeable Comparative Example 2 92 4.5-5.5 6 1.6 Water permeable Comparative Example 3 96 7-7.5 8 4.5 Water impermeable Comparative Example 4 93 4.5-5 6 3.1 Water impermeable Comparative Example 5 93 4.5-5 6 2.8 Water permeable Comparative Example 6 95 5-5.5 6 2.6 Water permeable Comparative Example 7 94 4.5-5 6 4.3 Water impermeable Comparative Example 8 95 6-7 8 1.7 Water permeable Comparative Example 9 96 3-3.5 4 4.1 Water impermeable Comparative Example 10 96 5.5-6 7 1.7 Water permeable

[0079] The adhesion strength, the elongation at break and the adhesion strength performance of each group of coatings are determined according to the A method of GB / T16777-2008, the elongation at break is determined according to the artificial climate aging method of 9.2.6 of GB / T16777-2008, and the cumulative radiation energy is 2000 MJ / m 2 (exposure time is about 1000 h)

[0080] Table 2 Basic properties of the coatings of each group

[0081] Group Adhesion strength (MPa) Elongation at break (%) Coating surface condition Type I standard ≥1 ≥450 —— Example 1 4.5 583 Smooth, flat, no bubbles Example 2 4.6 586 Smooth, flat, no bubbles Example 3 4.9 580 Smooth, flat, no bubbles Example 4 4.8 589 Smooth, flat, no bubbles Comparative Example 1 3.3 546 Smooth, flat, no bubbles Comparative Example 2 2.6 536 Smooth, flat, no bubbles Comparative Example 3 3.8 550 Warped, with bubbles Comparative Example 4 3.2 561 Smooth, flat, no bubbles Comparative Example 5 3.6 566 Warped, with bubbles Comparative Example 6 3.8 558 Smooth, flat, no bubbles Comparative Example 7 4.5 453 Rough, uneven, no bubbles Comparative Example 8 3.4 532 Smooth, flat, no bubbles Comparative Example 9 4.3 550 Smooth, flat, no bubbles Comparative Example 10 3.6 545 Smooth, flat, no bubbles

[0082] Single factor test: the main test of methyl propyl ester, hydroxyl-terminated polybutadiene, cyclohexane dimethylene diisocyanate, primary hydroxyl polyether resin, catalyst on the influence of coating dry time and dry time.

[0083] Single factor test method: according to the raw material composition, weight and method of example 1 to prepare self-spraying polyurethane coating, but the self-spraying polyurethane coating respectively lacks methyl propyl ester (group A), hydroxyl-terminated polybutadiene (group B), cyclohexane dimethylene diisocyanate (group C), primary hydroxyl polyether resin (group D) or catalyst (group F) one raw material, the above several self-spraying polyurethane coatings are tested according to the dry time and dry time in chapter 16 of GB / T16777-2008, and the results are shown in table 2.

[0084] Table 2 Dry time and dry time of coatings of groups A-F

[0085] Group Surface dry time (h) Real dry time (h) Group A 2.5-3 4 Group B 2.5-3 4 Group C 4.5-5 6 Group D 2-2.5 3 Group F 2.5-3 4

[0086] From table 2, it can be seen that the example 1 adding methyl propyl ester, hydroxyl-terminated polybutadiene, cyclohexane dimethylene diisocyanate, primary hydroxyl polyether resin and catalyst, compared with the A-F group coatings lacking methyl propyl ester, hydroxyl-terminated polybutadiene, cyclohexane dimethylene diisocyanate, primary hydroxyl polyether resin or catalyst, the dry time and dry time are shorter.

[0087] The present application can be implemented in various different ways and is not limited to the described embodiments, and it can be understood by those skilled in the art that the present application can be implemented by other specific ways without changing the technical idea or essential characteristics of the present application. Therefore, it should be understood that the above described embodiments are exemplary and are not intended to limit the present application.

Claims

1. A self-spraying polyurethane waterproof and anti-corrosion coating, characterized in that: The raw materials of the coating include: 10-50 kg of polyether polyamine, 120-240 kg of primary hydroxy polyether resin, 10-30 kg of maleic acid, 30-80 kg of hydroxy-terminated polybutadiene, 30-75 kg of cyclohexane dimethylene diisocyanate, 0.6-1.8 kg of catalyst, 2-6 kg of auxiliary agent and 5-40 kg of solvent, wherein the catalyst includes one or more of dibutyltin dilaurate, bismuth isooctanoate and stannous isooctanoate; The preparation method of the self-spraying polyurethane waterproof and anti-corrosion coating is as follows: S1, placing polyether polyamine, primary hydroxy polyether resin, maleic acid and hydroxy-terminated polybutadiene in a reaction kettle, mixing and reacting at a temperature of 100-130° C. and under negative pressure, wherein the negative pressure condition is to heat the reaction kettle to 100-130° C., start a negative pressure vacuum machine to evacuate to a negative pressure of 0.08-0.1 MPa, and react for 1-2 hours under constant temperature and negative pressure of 0.08-0.1 MPa; S2, when the temperature of the reaction kettle drops to 70-85° C., adding cyclohexane dimethylene diisocyanate into the reaction kettle for reaction; S3, when the temperature of the reactor drops to 55-60°C, adding the catalyst to the reactor and stirring evenly, then adding the additive and stirring evenly, adding the solvent and stirring evenly, to obtain a polyurethane waterproof and anti-corrosion coating; S4, the polyurethane waterproof anti-corrosion coating is cooled to room temperature, and the polyurethane waterproof anti-corrosion coating and a preset gas are injected into a self-spraying bottle to obtain a self-spraying polyurethane waterproof anti-corrosion coating, wherein the preset gas is nitrogen or propane.

2. The self-spraying polyurethane waterproof and anti-corrosion coating according to claim 1, characterized in that: The molecular weight of the polyether polyamine is 430-5000.

3. The self-spraying polyurethane waterproof and anti-corrosion coating according to claim 2, characterized in that: The polyether polyamine includes one or more of polyetheramine D-400, polyetheramine T-403, polyetheramine T-3000 and polyetheramine T-4000.

4. The self-spraying polyurethane waterproof and anti-corrosion coating according to claim 1, characterized in that: The molecular weight of the primary hydroxy polyether resin is 2000-6000.

5. A method for preparing the self-spraying polyurethane waterproof and anti-corrosion coating according to any one of claims 1 to 4, characterized in that: The steps of the method are as follows: S1, placing polyether polyamine, primary hydroxy polyether resin, maleic acid and hydroxy-terminated polybutadiene in a reaction kettle, and mixing and reacting at a temperature of 100-130° C. and under negative pressure; S2, when the temperature of the reaction kettle drops to 70-85° C., adding cyclohexane dimethylene diisocyanate into the reaction kettle for reaction; S3, when the temperature of the reactor drops to 55-60°C, adding the catalyst to the reactor and stirring evenly, then adding the additive and stirring evenly, adding the solvent and stirring evenly, to obtain a polyurethane waterproof and anti-corrosion coating; S4, the polyurethane waterproof anti-corrosion coating is cooled to room temperature, and the polyurethane waterproof anti-corrosion coating and a preset gas are injected into a self-spraying bottle to obtain a self-spraying polyurethane waterproof anti-corrosion coating.

6. The method for preparing the self-spraying polyurethane waterproof and anti-corrosion coating according to claim 5, characterized in that: The preset gas is nitrogen or propane.

7. The method for preparing the self-spraying polyurethane waterproof and anti-corrosion coating according to claim 5, characterized in that: In step S1, the mixing reaction at a temperature of 100-130° C. and a negative pressure condition is specifically as follows: heating the reactor to 100-130° C., turning on a negative pressure vacuum machine to evacuate to a negative pressure of 0.08-0.1 MPa, and reacting for 1-2 hours at a constant temperature and a negative pressure of 0.08-0.1 MPa.