CN115895414B - Preparation method of single-component polyurea anti-corrosion heat-insulation coating - Google Patents
Preparation method of single-component polyurea anti-corrosion heat-insulation coating Download PDFInfo
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Abstract
The invention belongs to the technical field of anti-corrosion coating, and particularly relates to a preparation method of a single-component polyurea anti-corrosion heat-insulation coating. In order to improve the corrosion resistance and heat insulation performance of the anticorrosive paint, the invention mainly comprises the following steps: (1) Plugging the aerogel pore canal by using a glass body formed by boron substances at high temperature; (2) The 1, 4-butanediol bis (4-aminobenzoate) is used as a key raw material of the single-component polyurea anti-corrosion heat-insulating coating, the reaction speed is low when the single-component polyurea anti-corrosion heat-insulating coating reacts with polyisocyanate, a foundation is laid for preparing a polyurea prepolymer with more uniform molecular weight distribution and polyurea with high physical and chemical properties, in addition, the 1, 4-butanediol bis (4-aminobenzoate) does not contain ether bonds with poor heat-oxidation aging resistance in the molecule, the polyurea resin obtained by the reaction of the single-component polyurea anti-corrosion heat-insulating coating also does not contain ether bonds, and the artificial aging resistance of a coating film formed by the single-component polyurea anti-corrosion heat-insulating coating is further improved.
Description
Technical Field
The invention belongs to the technical field of anti-corrosion coating, and particularly relates to a preparation method of a single-component polyurea anti-corrosion heat-insulation coating.
Background
The anticorrosive paint is widely applied to the fields of buildings, railways, bridges, petroleum, chemical industry, metallurgy and the like, at present, the annual corrosion economic loss in the world is about 10000 hundred million dollars, about 30% of steel is scrapped due to corrosion each year, and the development of the anticorrosive paint with high durability is an urgent task for the research and development of the current new material technology, and has very wide application prospect and huge economic benefit.
In the field of anticorrosive coatings, film-forming resins are basic components and key components of the coating and are the primary factors for determining the quality of the coating. At present, the anticorrosive paint is limited by the chemical properties of the traditional resin, and has the application problems of lower corrosion resistance, shorter service life, more singleness and the like, so that the application and development of the anticorrosive paint are greatly restricted, and the development of the anticorrosive paint with excellent corrosion resistance, long service life and multifunction is an urgent problem to be solved in the field of the anticorrosive paint.
And the energy consumption is also increasing while the economic development of China is fast, wherein the energy consumption of the building is large. Along with the implementation of national energy-saving and environment-friendly industrial policies and the continuous improvement of energy-saving consciousness of people, building energy conservation is an urgent problem to be solved. Aerogel is a novel material with a nano porous structure, has a very good heat insulation effect, is the lightest solid material with the best heat insulation performance in the world at present, is called as a final heat insulation material, has the lowest heat conductivity and obvious heat insulation effect advantage, and has wide application prospect in the field of buildings. However, in the process of preparing the heat-insulating coating from the aerogel, since the liquid component or the solvent can enter the pore structure of the aerogel, the aerogel in the coating loses most of heat-insulating function, so that the surface of the aerogel is treated to block the pore canal, and water or the organic solvent can be prevented from entering, so that the aim of retaining the heat-insulating performance of the aerogel is achieved, and the heat-insulating coating from the aerogel is a primary problem for preparing the heat-insulating coating from the aerogel.
In summary, there is an urgent need in the art to develop a new method for preparing one-component polyurea anticorrosive heat-insulating coating.
Disclosure of Invention
Starting from the technical problems set forth above, the invention aims to provide a preparation method of a single-component polyurea anti-corrosion heat-insulating coating, which aims to solve the defects in the prior art. When the single-component polyurea anti-corrosion heat-insulating coating prepared by the method is used in the fields of building outer walls, steel structures, industrial pipelines and the like, excellent anti-corrosion and heat-insulating effects can be achieved, and meanwhile, a coating film formed by the single-component polyurea anti-corrosion heat-insulating coating has excellent ageing resistance and good physical properties.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
step 1, mixing a phosphoric acid aqueous solution, boric acid and deionized water, and heating to react to obtain a boron phosphate aqueous solution;
step 2, slowly adding the aerogel slurry into the aqueous solution of boron phosphate under the stirring condition, uniformly dispersing, drying, and roasting under the nitrogen protection condition to obtain aerogel powder treated by the boron phosphate;
and 3, mixing and stirring 1, 4-butanediol bis (4-aminobenzoate), a solvent, aerogel powder treated by boron phosphate and polyisocyanate for reaction, adding a latent curing agent for reaction, and cooling and discharging to obtain the single-component polyurea anti-corrosion heat-insulating coating.
Further, the weight concentration of the phosphoric acid aqueous solution in the step 1 is 85%, and the boric acid is represented by the chemical formula H 3 BO 3 White crystalline powder with a content of 99.5%; the mole ratio of phosphoric acid to boric acid in the phosphoric acid aqueous solution is 1-1.1: 1, preferably 1 to 1.08:1, more preferably 1 to 1.05:1, a step of;
the weight ratio of the deionized water to (phosphoric acid aqueous solution+boric acid) is 0.5-2: 1, preferably 0.5 to 1.5:1, more preferably 0.5 to 1.0:1.
further, the heating temperature in the step 1 is 85-95 ℃ and the time is 0.5-3 h,
further, the aerogel slurry in the step 2 is a dispersion of aerogel powder, and is a paste/slurry material prepared by dispersing hydrophobic aerogel powder in an aqueous medium, for example, the aerogel slurry with the model AG-S manufactured and sold by new material limited liability company in shanxi, has a aerogel solid content of 10%, a thermal conductivity coefficient after drying of 0.018-0.022W/(M.K), and a particle size of 15-50 μm.
Further, the weight ratio of the aerogel slurry to the aqueous solution of boron phosphate in the step 2 is 1-15: 1, preferably 1 to 10:1, more preferably 1 to 5:1.
further, the temperature of the drying in the step 2 is 100-120 ℃, the time is 12-24 hours, the temperature of the roasting is 450-600 ℃, and the time is 4-8 hours.
Further, in the step 3, 1, 4-butanediol bis (4-aminobenzoate) is an aromatic diamine containing an ester bond, the functionality is 2, the molecular weight is 328, and the chemical structural formula is:
for example, the Beiliaan series DP-90 manufactured and sold by Shanxi province construction science research institute Co., ltd.
Further, the solvent in the step 3 is one or more of ethyl acetate, dimethyl carbonate, diethyl carbonate, xylene and ethylene glycol dimethyl ether.
Further, the polyisocyanate in the step 3 is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate trimer.
Further, the latent curing agent in the step 3 is an oxazolidine latent curing agent, and the structural formula is as follows:
for example, a curing agent WHA-254 which is produced and sold by Shanxi institute of construction and sciences, inc. and which can coexist stably with isocyanate in a dry environment, and under the condition of moisture, the latent curing agent reacts with water and then reacts with isocyanate to achieve the purpose of macroscopic curing.
Further, in the step 3, the weight ratio of the 1, 4-butanediol bis (4-aminobenzoate), the solvent, the aerogel powder treated by the boron phosphate, the polyisocyanate and the latent curing agent is 50-80 parts: 5-20 parts of: 1-10 parts of: 30-60 parts of: 5-15 parts.
Further, the temperature of the stirring reaction in the step 3 is 60-80 ℃ for 0.5-20 h, the temperature of the reaction is 30-60 ℃ for 0.5-1.0 h.
Compared with the prior art, the invention has the following advantages:
1. the 1, 4-butanediol bis (4-aminobenzoate) used in the invention is a key raw material of the single-component polyurea anti-corrosion heat-insulation coating, and the activity of amino in the molecular structure is far lower than that of amino in polyetheramine due to the existence of electron-withdrawing groups, so that the single-component polyurea anti-corrosion heat-insulation coating is a steric-type low-activity diamino chain extender, has a slow reaction speed and a gel time of up to 30 minutes when reacting with polyisocyanate, lays a foundation for preparing a polyurea prepolymer with more uniform molecular weight distribution and polyurea with high physicochemical property, and therefore, a coating film formed by the single-component polyurea anti-corrosion heat-insulation coating synthesized by the method has excellent anti-corrosion property;
2. according to the invention, the glass body formed by the boron-based material at high temperature is used for plugging the aerogel pore canal, so that the problem that water or an organic solvent enters the aerogel pore canal to lose a heat insulation function is effectively solved, and the heat insulation performance is reserved when the treated aerogel powder is used as a filler for preparing a coating, so that a coating film formed by the single-component polyurea anti-corrosion heat insulation coating synthesized by the method has a lower heat conductivity coefficient;
3. the polyurea resin used in the invention is used as a film forming substance, and from the viewpoint of molecular structure, a structure similar to a chelate can be formed in the whole polyurea polymer network, so that the molecular structure is more stable. In addition, the urea-based structure in the polyurea structure has higher thermal stability, so that a coating film formed by the single-component polyurea anti-corrosion heat-insulating coating synthesized by the method has excellent artificial accelerated aging resistance, physical and mechanical properties and substrate adhesion;
4. the 1, 4-butanediol bis (4-aminobenzoate) molecular mechanism used in the invention does not contain ether bonds with poor thermal-oxidative aging resistance, and the macromolecular structure of the polyurea resin obtained by reacting with polyisocyanate does not contain ether bonds, so that the aging resistance of a coating film formed by the single-component polyurea anti-corrosive heat-insulating coating synthesized by the method is further improved.
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments. It will be appreciated that other embodiments are contemplated and may be made without departing from the scope or spirit of the invention. The following detailed description is, therefore, not to be taken in a limiting sense.
All numbers expressing feature sizes, amounts, and physical and chemical characteristics used in the specification and claims are to be understood as being modified in all instances by the term "about" unless otherwise indicated. Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be varied appropriately by those skilled in the art utilizing the desired properties sought to be obtained by the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers subsumed within that range and any range within that range, e.g., 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, 5, and the like.
The present invention will be described in more detail with reference to examples. It should be noted that the description and examples are intended to facilitate an understanding of the invention and are not intended to limit the invention. The scope of the invention is defined by the appended claims.
Example 1
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 115.3 g of 85% phosphoric acid aqueous solution, 62 g of boric acid and 177.3 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 95 ℃ and stirred for 3.0 hours for reaction, and cooled to obtain 45.1% boron phosphate aqueous solution;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 50 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is dispersed for 1.5 hours and then dried in a 100 ℃ oven for 24 hours, and after drying, the mixture is baked for 8 hours under the protection of nitrogen at 450 ℃ to obtain the aerogel powder treated by the boron phosphate.
(3) 50 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 20 parts by weight of dimethyl carbonate, 10 parts by weight of aerogel powder treated by boron phosphate and 40 parts by weight of isophorone diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 0.5 hour at 80 ℃, 5 parts by weight of latent curing agent is added and reacted for 0.5 hour at 60 ℃, and then cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Example 2
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 121 g of 85% phosphoric acid, 62 g of boric acid and 91.5 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 85 ℃ and stirred for reaction for 0.5 hours, and cooled to obtain an aqueous solution of boron phosphate with 60.0% boron phosphate content;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 250 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is stirred for 0.5 hour and then dried in a baking oven at 120 ℃ for 12 hours, and after drying, the mixture is baked for 4 hours at 600 ℃ under the protection of nitrogen, so as to obtain aerogel powder treated by boron phosphate.
(3) 80 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 5 parts by weight of ethyl acetate, 1 part by weight of aerogel powder treated by boron phosphate and 55 parts by weight of toluene diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 2 hours at 60 ℃, 15 parts by weight of latent curing agent are added and reacted for 1.0 hour at 30 ℃, and then cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Example 3
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 121 g of 85% phosphoric acid, 62 g of boric acid and 183 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 90 ℃ and stirred for 2.0 hours for reaction, and cooled to obtain an aqueous solution of boron phosphate with 45% boron phosphate content;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 150 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is stirred for 1.0 hour and then dried in a baking oven at 120 ℃ for 24 hours, and after drying, the mixture is baked for 6 hours at 500 ℃ under the protection of nitrogen, so as to obtain aerogel powder treated by boron phosphate.
(3) 60 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 10 parts by weight of ethylene glycol dimethyl ether, 5 parts by weight of aerogel powder treated by boron phosphate and 60 parts by weight of dicyclohexylmethane diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted at 70 ℃ for 1.0 hour, 10 parts by weight of latent curing agent is added and reacted at 50 ℃ for 1.0 minute, and the mixture is cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Example 4
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 115.3 g of 85% phosphoric acid, 62 g of boric acid and 132.8 g of deionized water were added to a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a reflux unit, heated to 95 ℃ and stirred for reaction for 3.0 hours, and cooled to obtain an aqueous solution of boron phosphate having a boron phosphate content of 51.6%;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 200 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is stirred for 1.5 hours and then dried in a 110 ℃ oven for 18 hours, and after drying, the mixture is baked for 5 hours under the protection of nitrogen at 550 ℃ to obtain aerogel powder treated by boron phosphate.
(3) 50 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 10 parts by weight of diethyl carbonate, 10 parts by weight of aerogel powder treated by boron phosphate and 30 parts by weight of hexamethylene diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted at 80 ℃ for 1.0 hour, 5 parts by weight of latent curing agent are added and reacted at 50 ℃ for 0.5 hour, and then the mixture is cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Example 5
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 115.3 g of 85% phosphoric acid, 62 g of boric acid and 177.3 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 95 ℃ and stirred for 3.0 hours for reaction, and cooled to obtain an aqueous solution of boron phosphate with 45.1% boron phosphate content;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 100 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is stirred for 0.5 hour and then dried in a baking oven at 120 ℃ for 24 hours, and after drying, the mixture is baked for 8 hours at 450 ℃ under the protection of nitrogen, so as to obtain aerogel powder treated by boron phosphate.
(3) 80 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 5 parts by weight of dimethylbenzene, 2 parts by weight of aerogel powder treated by boron phosphate and 53 parts by weight of toluene diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 2 hours at 70 ℃, 12 parts by weight of latent curing agent are added and reacted for 1.0 minute at 60 ℃, and the single-component polyurea anti-corrosive heat-insulating coating is obtained after cooling and discharging.
Example 6
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 124.5 g of 85% phosphoric acid aqueous solution, 62 g of boric acid and 279.75 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 95 ℃ and stirred for 3.0 hours for reaction, and cooled to obtain 34.3% boron phosphate aqueous solution;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 500 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is dispersed for 1.5 hours and then dried in a 100 ℃ oven for 24 hours, and after drying, the mixture is baked for 8 hours under the protection of nitrogen at 450 ℃ to obtain the aerogel powder treated by the boron phosphate.
(3) 50 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 20 parts by weight of dimethyl carbonate, 10 parts by weight of aerogel powder treated by boron phosphate and 40 parts by weight of isophorone diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 0.5 hour at 80 ℃, 5 parts by weight of latent curing agent is added and reacted for 0.5 hour at 60 ℃, and then cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Example 7
A preparation method of a single-component polyurea anticorrosive heat-insulating coating comprises the following steps:
(1) 126.8 g of 85% phosphoric acid aqueous solution, 62 g of boric acid and 377.6 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 95 ℃ and stirred for 3.0 hours for reaction, and cooled to obtain a boron phosphate aqueous solution with a boron phosphate content of 28.2%;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 750 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is dispersed for 1.5 hours and then dried in a 100 ℃ oven for 24 hours, and after drying, the mixture is baked for 8 hours under the protection of nitrogen at 450 ℃ to obtain the aerogel powder treated by the boron phosphate. (3) 50 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 20 parts by weight of dimethyl carbonate, 10 parts by weight of aerogel powder treated by boron phosphate and 40 parts by weight of isophorone diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 0.5 hour at 80 ℃, 5 parts by weight of latent curing agent is added and reacted for 0.5 hour at 60 ℃, and then cooled and discharged to obtain the single-component polyurea anti-corrosion heat-insulation coating.
Comparative example 1
50 parts by weight of 1, 4-butanediol bis (4-aminobenzoate), 20 parts by weight of dimethyl carbonate, 10 parts by weight of aerogel powder and 40 parts by weight of isophorone diisocyanate are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, mixed and reacted for 0.5 hour at 80 ℃, 5 parts by weight of latent curing agent is added and reacted for 0.5 hour at 60 ℃, and then cooled and discharged to obtain the single-component polyurea anti-corrosive heat insulation coating.
Comparative example 2
(1) 115.3 g of 85% phosphoric acid aqueous solution, 62 g of boric acid and 177.3 g of deionized water are added into a four-neck flask provided with a stirrer, a thermometer, a nitrogen inlet and a reflux device, heated to 95 ℃ and stirred for 3.0 hours for reaction, and cooled to obtain 45.1% boron phosphate aqueous solution;
(2) 50 g of aqueous solution of boron phosphate is added into a beaker provided with stirring slurry, 50 g of aerogel slurry is slowly added into the beaker under stirring, the mixture is dispersed for 1.5 hours and then dried in a 100 ℃ oven for 24 hours, and after drying, the mixture is baked for 8 hours under the protection of nitrogen at 450 ℃ to obtain the aerogel powder treated by the boron phosphate.
(3) A four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a reflux device was charged with 50 parts by weight of polytetramethylene ether glycol PTMG-650 (for example, PTMG-650 which can be produced and sold by Basff, germany, molecular weight 650, functionality 2), 20 parts by weight of dimethyl carbonate, 10 parts by weight of boron phosphate-treated aerogel powder and 40 parts by weight of isophorone diisocyanate, and stirred and reacted at 80℃for 0.5 hour, then 5 parts by weight of a latent curing agent was added and reacted at 60℃for 0.5 hour, and the mixture was cooled and discharged to obtain a one-component polyurea anticorrosive heat-insulating coating.
The properties of each of the one-component polyurea anticorrosive heat-insulating coatings obtained in each of examples 1 to 7 and comparative examples 1 to 2 were measured and the measurement results are shown in Table 1. The specific measurement method for the relevant performance is as follows:
(1) Adhesion force
The test was carried out according to the relevant test method in GB/T5210-2006 adhesion test of paint and varnish pull-off method. If the adhesive force is greater than or equal to 4MPa, the general industrial application requirements of the steel structure anti-corrosion coating material for the building are met; if the adhesive force is greater than or equal to 7MPa, the adhesive force performance of the steel structure anti-corrosion coating material for the building is considered to be excellent.
(2) Acid resistance
The test was carried out according to the test method described in GB/T9274-1988 determination of liquid Medium resistance of paints and varnishes. If the acid resistance is greater than or equal to 96 hours, the general industrial application requirements of the steel structure anti-corrosion coating material for the building are met; if the acid resistance is greater than or equal to 168 hours, the steel structure anticorrosive paint for the building is considered to be excellent in acid resistance.
(3) Salt tolerance
The test was carried out according to the test method described in GB/T9274-1988 determination of liquid Medium resistance of paints and varnishes. If the salt tolerance is greater than or equal to 120 hours, the general industrial application requirements of the steel structure anti-corrosion coating material for the building are met; if the salt tolerance is greater than or equal to 240 hours, the steel structure anticorrosive paint for the building is considered to be excellent in salt tolerance.
(4) Alkali resistance
The test was carried out according to the test method described in GB/T9274-1988 determination of liquid Medium resistance of paints and varnishes. If the alkali resistance is greater than or equal to 120 hours, the general industrial application requirements of the steel structure anti-corrosion coating material for the building are met; if the alkali resistance is more than or equal to 240h, the steel structure anticorrosive paint for the building is considered to have excellent alkali resistance.
(5) Resistance to artificial aging
The test was carried out according to the relevant test method in GB/T1865-2009 "Artificial weathering and Artificial radiation Exposure of paints and varnishes". If the artificial aging resistance is more than or equal to 500 hours, the general industrial application requirements of the steel structure anti-corrosion coating material for the building are met; if the artificial aging resistance is greater than or equal to 1000 hours, the steel structure anticorrosive paint for the building is considered to have excellent artificial aging resistance.
(6) Coefficient of thermal conductivity
The test is carried out according to the relevant test method in GB/T10295-2008 heat flow meter method for measuring steady state thermal resistance and related characteristics of heat insulation materials. If the thermal conductivity is less than or equal to 0.15 w/m.K, the material is considered to meet the general industrial application requirements of the heat insulation coating material for the building; if the thermal conductivity is 0.08 w/mK or less, the heat insulating coating for construction is considered to be excellent in heat insulating resistance.
Table 1 shows the results of performance tests of the one-component polyurea anticorrosive heat-insulating coatings obtained according to examples 1 to 7 of the present invention. Wherein, the technical requirement refers to the technical standard which is required to be achieved by the single-component polyurea waterproof heat-insulating coating according to the related test method.
Table 1 results of Performance test of the one-component polyurea anticorrosive Heat-insulating coatings obtained in examples 1 to 7
From table 1, examples 1 to 7 above demonstrate that the one-component polyurea anticorrosive heat-insulating coating prepared by the method according to the present invention can give anticorrosive heat-insulating coating films having good corrosion resistance, good thermal insulation properties against artificial accelerated aging.
The embodiments of the present invention are merely described in terms of preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (12)
1. The preparation method of the single-component polyurea anticorrosive heat-insulating coating is characterized by comprising the following steps of:
step 1, mixing a phosphoric acid aqueous solution, boric acid and deionized water, and heating to react to obtain a boron phosphate aqueous solution;
step 2, slowly adding the aerogel slurry into the aqueous solution of boron phosphate under the stirring condition, uniformly dispersing, drying, and roasting under the nitrogen protection condition to obtain aerogel powder treated by the boron phosphate;
and 3, mixing and stirring 1, 4-butanediol bis (4-aminobenzoate), a solvent, aerogel powder treated by boron phosphate and polyisocyanate for reaction, adding a latent curing agent for reaction, and cooling and discharging to obtain the single-component polyurea anti-corrosion heat-insulating coating.
2. The preparation method of the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the weight concentration of the phosphoric acid aqueous solution in the step 1 is 85%, and the molar ratio of phosphoric acid to boric acid in the phosphoric acid aqueous solution is 1-1.1: 1, wherein the weight ratio of the deionized water to (phosphoric acid aqueous solution+boric acid) is 0.5-2: 1.
3. the method for preparing the one-component polyurea anti-corrosive heat insulating coating according to claim 1, wherein the heating temperature in the step 1 is 85-95 ℃ and the heating time is 0.5-3 h.
4. The method for preparing the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the aerogel slurry in the step 2 is a dispersion liquid of aerogel powder, and is a pasty/pasty material prepared by dispersing hydrophobic aerogel powder in an aqueous medium.
5. The method for preparing the one-component polyurea anticorrosive heat-insulating coating according to claim 1, wherein the weight ratio of the aerogel slurry to the aqueous solution of boron phosphate in the step 2 is 1-15: 1.
6. the method for preparing the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the temperature of drying in the step 2 is 100-120 ℃ for 12-24 hours, the temperature of roasting is 450-600 ℃ for 4-8 hours.
7. The method for preparing the one-component polyurea anticorrosive heat-insulating coating according to claim 1, wherein in the step 3, 1, 4-butanediol bis (4-aminobenzoate) is an aromatic diamine containing an ester bond, the functionality is 2, the molecular weight is 328, and the chemical structural formula is:
8. the preparation method of the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the solvent in the step 3 is one or more of ethyl acetate, dimethyl carbonate, diethyl carbonate, xylene and ethylene glycol dimethyl ether.
9. The method for preparing the one-component polyurea anticorrosive heat-insulating coating according to claim 1, wherein the polyisocyanate in the step 3 is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate and hexamethylene diisocyanate trimer.
10. The method for preparing the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the latent curing agent in the step 3 is an oxazolidine latent curing agent, and the structural formula is as follows:
11. the preparation method of the one-component polyurea anticorrosive heat-insulating coating according to claim 1, wherein the weight ratio of 1, 4-butanediol bis (4-aminobenzoate), solvent, boron phosphate treated aerogel powder, polyisocyanate and latent curing agent in the step 3 is 50-80 parts: 5-20 parts of: 1-10 parts of: 30-60 parts of: 5-15 parts.
12. The method for preparing the single-component polyurea anti-corrosion heat-insulating coating according to claim 1, wherein the temperature of the stirring reaction in the step 3 is 60-80 ℃ for 0.5-20 h, and the temperature of the reaction is 30-60 ℃ for 0.5-1.0 h.
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