Disclosure of Invention
In view of the above problems, the present invention is directed to providing a method.
The invention is realized by the following technical scheme:
(1) adding 15-17 parts by weight of graphene oxide into 5-7 times of absolute ethyl alcohol, carrying out ultrasonic treatment for 10-12min at 40-43KHz, then adding 20-30 parts of aluminum chloride solution with the concentration of 0.8-1.2mol/L and 3-5 parts of alkylphenol polyoxyethylene, continuing ultrasonic treatment for 20-30min, standing for 2-3h at 50-55 ℃, then adding 30-35% by mass of ammonia water solution, adjusting the pH value to 8-8.5, transferring the system into a reaction kettle, reacting for 15-18h at 160-165 ℃, cooling, filtering, washing, drying for 10-12h at 50-60 ℃, then roasting for 3-4h at 530-550 ℃, and grinding for later use;
(2) adding 15-20 parts of the product obtained in the step (1) into 40-50 parts of amino acid solution with the mass fraction of 34-36%, stirring at 50-60 ℃ and 300rpm of 200-; the amino acid can be lysine;
(3) adding 15-20 parts of the product obtained in the step (2) into 40-45 parts of acetone, stirring for 10-20min, adding 15-20 parts of acetone solution of epoxy resin E44 with the solid content of 32-35%, reacting for 3-5h at 63-65 ℃ and 500rpm, cooling, centrifuging for 15-17min at 1500-2000rpm, performing suction filtration, and drying the obtained product at 84-86 ℃ for 12-16 h;
(4) adding 15-20 parts of the product obtained in the step (3) into 40-50 parts of polytetrahydrofuran ether glycol, then adding 0.5-1 part of triethanolamine, heating to 103 ℃ at the stirring speed of 400 plus 500rpm, reacting for 40-50min, then adding 30-40 parts of isophorone diisocyanate, 30-45 parts of polytetrahydrofuran ether glycol and 0.5-0.8 part of organic tin catalyst, reacting for 2-3h at the stirring speed of 200 plus 300rpm at the stirring speed of 70-76 ℃, then adding 300 parts of deionized water into the mixture, shearing and dispersing for 40-50min at the high speed of 2200 plus 2300rpm, then adding 5-6 parts of ethylene glycol, and continuing stirring for 20-30 min.
The invention has the beneficial effects that: the coating prepared by the method has good antistatic property, excellent acid and alkali corrosion resistance, strong adhesive force and high hardness, and is suitable for antistatic and anticorrosion protection of machine tools; the method comprises the following steps of treating graphene oxide by using an aluminum chloride solution and alkylphenol polyoxyethylene ether, wherein the alkylphenol polyoxyethylene ether is used as a template, loading aluminum oxide on the surface of the graphene oxide under an alkaline hydrothermal condition, and removing the alkylphenol polyoxyethylene ether template through calcination to form a micro channel, so that the specific surface area of the graphene oxide is greatly increased, the porous property is endowed, and the conductivity and the corrosion resistance of the graphene oxide are enhanced; the amino acid solution and the zinc ions are continuously loaded on the surface of the polyurethane monomer through a complexing reaction to generate an amino acid zinc-aluminum oxide-graphene oxide compound, so that not only are metal zinc ions introduced, but also the grafting purpose of functional groups such as amino groups and carboxyl groups is achieved, the amino groups and the carboxyl groups can be utilized to react with isocyanate groups and hydroxyl groups in the polyurethane monomer, the crosslinking effect of the amino groups and the carboxyl groups on the polyurethane substrate is enhanced, an interconnected network structure is formed, the adhesive force and the hardness of the coating are remarkably improved, and the antistatic performance of the coating is enhanced.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
(1) Adding 16 parts by weight of graphene oxide into absolute ethyl alcohol with the volume 6 times that of the graphene oxide, carrying out ultrasonic treatment for 11min at 42KHz, then adding 25 parts of aluminum chloride solution with the concentration of 1.0mol/L and 4 parts of alkylphenol polyoxyethylene, continuing ultrasonic treatment for 25min, standing for 3h at 52 ℃, then adding 33% of ammonia water solution by mass, adjusting the pH to 8.3, transferring the system into a reaction kettle, reacting for 17h at 163 ℃, cooling, filtering, washing, drying for 11h at 55 ℃, then roasting for 4h at 543 ℃, and grinding for later use;
(2) adding 18 parts of the product obtained in the step (1) into 45 parts of 35% lysine solution, stirring at 55 ℃ and 260rpm for 15min, adding 17 parts of 32% zinc sulfate solution, adjusting the pH to 8.3 by using saturated ammonia water solution, continuously stirring for reaction for 50min, filtering, washing and drying to obtain a zinc amino acid-aluminum oxide-graphene oxide compound;
(3) adding 18 parts of the product obtained in the step (2) into 43 parts of acetone, stirring for 15min, adding 18 parts of acetone solution of epoxy resin E44 with the solid content of 34%, reacting for 4h at 64 ℃ and 400rpm, cooling, centrifuging for 16min at 1800rpm, performing suction filtration, and drying the product at 85 ℃ for 15 h;
(4) adding 17 parts of the product obtained in the step (3) into 45 parts of polytetrahydrofuran ether glycol, then adding 0.8 part of triethanolamine, heating to 103 ℃ under stirring at 450rpm, reacting for 45min, then adding 35 parts of isophorone diisocyanate, 40 parts of polytetrahydrofuran ether glycol and 0.6 part of organic tin catalyst, reacting for 3h at 73 ℃ and 240rpm, then adding 240 parts of deionized water, shearing and dispersing at 2200rpm for 45min at high speed, then adding 6 parts of ethylene glycol, and continuing stirring for 25 min.
The coating was tested at 5 wt.% H2SO4No change at 5 wt.% Na OH, no change at 3 wt.% Na Cl; adhesion of grade 0, pencil hardness of 4H, surface resistivity of 1.5X 104%。
Example 2
(1) Adding 16 parts by weight of graphene oxide into absolute ethyl alcohol with the volume 6 times that of the graphene oxide, carrying out ultrasonic treatment for 11min at 42KHz, then adding 25 parts of aluminum chloride solution with the concentration of 1.0mol/L and 4 parts of alkylphenol polyoxyethylene, continuing ultrasonic treatment for 25min, standing for 3h at 52 ℃, then adding 33% of ammonia water solution by mass, adjusting the pH to 8.3, transferring the system into a reaction kettle, reacting for 17h at 163 ℃, cooling, filtering, washing, drying for 11h at 55 ℃, then roasting for 4h at 543 ℃, and grinding for later use;
(2) adding 18 parts of the product obtained in the step (1) into 43 parts of acetone, stirring for 15min, adding 18 parts of acetone solution of epoxy resin E44 with the solid content of 34%, reacting for 4h at 64 ℃ and 400rpm, cooling, centrifuging for 16min at 1800rpm, performing suction filtration, and drying the product at 85 ℃ for 15 h;
(3) adding 17 parts of the product obtained in the step (2) into 45 parts of polytetrahydrofuran ether glycol, then adding 0.8 part of triethanolamine, heating to 103 ℃ under stirring at 450rpm, reacting for 45min, then adding 35 parts of isophorone diisocyanate, 40 parts of polytetrahydrofuran ether glycol and 0.6 part of organic tin catalyst, reacting for 3h at 73 ℃ and 240rpm, then adding 240 parts of deionized water, shearing and dispersing at 2200rpm for 45min at high speed, then adding 6 parts of ethylene glycol, and continuing stirring for 25 min.
The coating was tested at 5 wt.% H2SO4White blistering occurred, cracking of the coating at 5 wt.% Na OH, no change at 3 wt.% Na Cl; adhesion 2 grade, pencil hardness 2H, surface resistivity 3.7X 105%。
Example 3
(1) Adding 16 parts by weight of graphene oxide into absolute ethyl alcohol with the volume 6 times that of the graphene oxide, carrying out ultrasonic treatment for 11min at 42KHz, then adding 25 parts of aluminum chloride solution with the concentration of 1.0mol/L and 4 parts of alkylphenol polyoxyethylene, continuing ultrasonic treatment for 25min, standing for 3h at 52 ℃, then adding 33% of ammonia water solution by mass, adjusting the pH to 8.3, transferring the system into a reaction kettle, reacting for 17h at 163 ℃, cooling, filtering, washing, drying for 11h at 55 ℃, then roasting for 4h at 543 ℃, and grinding for later use;
(2) adding 18 parts of the product obtained in the step (1) into 45 parts of 35% lysine solution, stirring at 55 ℃ and 260rpm for 15min, adding 17 parts of 32% zinc sulfate solution, adjusting the pH to 8.3 by using saturated ammonia water solution, continuously stirring for reaction for 50min, filtering, washing and drying to obtain a zinc amino acid-aluminum oxide-graphene oxide compound;
(3) adding 17 parts of the product obtained in the step (2) into 45 parts of polytetrahydrofuran ether glycol, then adding 0.8 part of triethanolamine, heating to 103 ℃ under stirring at 450rpm, reacting for 45min, then adding 35 parts of isophorone diisocyanate, 40 parts of polytetrahydrofuran ether glycol and 0.6 part of organic tin catalyst, reacting for 3h at 73 ℃ and 240rpm, then adding 240 parts of deionized water, shearing and dispersing at 2200rpm for 45min at high speed, then adding 6 parts of ethylene glycol, and continuing stirring for 25 min.
The coating was tested at 5 wt.% H2SO4White bubbling with 5 wt.% Na OH and no change with 3 wt.% Na Cl; adhesion 3 grade, pencil hardness 2H, surface resistivity 1.3X 105%。
And (3) performance testing:
medium resistance: the coatings were tested for their resistance to acids, bases and salt water according to GB 9274-1988 "determination of the resistance to liquid media for paints and varnishes", the corrosive media being 5 wt.% H2SO4Solution, 5 wt.% Na OH solution, 3 wt.% Na Cl solution. The specific method comprises the following steps: and horizontally placing the sample coating side upwards, dripping a plurality of drops of corrosive medium, and keeping the interval between adjacent liquid centers at least 20 mm. The sample was left at (23. + -. 2 ℃) for 24 hours to be sufficiently exposed to air without any other disturbance. And then, thoroughly cleaning the surface of the coating by using clean water, and immediately (1-2 min) checking the change phenomenon of the coating. If the surface of the coating is not changed, the phenomena of whitening, foaming, corrosion shedding and the like do not occur, and the medium resistance of the coating is considered to be passed.
Adhesion force: the adhesion of the coating was tested in accordance with GB/T9286-1998 test for marking test of paint films of paints and varnishes, using a cutter specification of 5X 5, a depth of 2 mm and a tape of 3M. The specific process is as follows: firstly, fixing a sample coated with a coating on the surface, then, vertically arranging a cutter on one surface of the coating of the sample, and uniformly and forcibly scribing a specified number of grids on the coating. After being cleaned by a soft brush, the adhesive tape is uniformly and completely adhered to the grid, is stably torn within 5min at an angle of 60 degrees, and the number of stripped grids is observed, so that the adhesive force grade is judged.
Pencil hardness: the hardness of the coating pencil was tested according to GB/T6739-. The specific process is as follows: firstly, one side of a sample coating is upwards and horizontally fixed, then a balance weight is adjusted to enable a pencil to form a 45-degree angle with a plane to be measured, the trolley is pushed at a constant speed to enable the pencil to scratch on the coating, the scratch is wiped by an eraser, the surface of the coating is observed, and the hardness of the pencil which is not wiped off is the actual hardness of the final coating.
The surface resistance of the coating obtained by each group is measured by a ZST-121 surface resistance tester produced by Beijing Zhonghang times instrument and equipment Limited company so as to represent the antistatic performance of the coating.
The above tests were repeated 5 times for 5 parallel experiments per group and the average was taken.