CN108165102B - Graphene modified water-based paint and preparation method thereof - Google Patents
Graphene modified water-based paint and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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Abstract
The invention relates to a water-based paint and a preparation method thereof, wherein the water-based paint is composed of water-based paint and ammonium polyphosphate-organic bentonite/graphene composite nano material, each 100 parts by weight of the water-based paint contains 3-8 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps: pouring 70-85% of phosphoric acid by mass into a reactor, heating and stirring, adding urea when the temperature is raised to 75-80 ℃, synchronously adding organic bentonite and nano-graphene when the temperature is raised to 110-120 ℃, continuously raising the temperature to 130-135 ℃ after the addition is finished, stirring and reacting for 10-30min, then carrying out high-temperature treatment on the product at 180-200 ℃ for 1-2h, cooling to room temperature, and carrying out nano-crushing to obtain the ammonium polyphosphate-organic bentonite/graphene composite nano-material. The water-based paint disclosed by the invention is highly dispersed and cannot agglomerate, the film forming uniformity of the water-based paint is greatly improved, the adhesive force is strong, and the water-based paint cannot bulge or crack or peel.
Description
Technical Field
The invention relates to a water-based paint and a preparation method thereof, in particular to a graphene modified water-based paint and a preparation method thereof, and belongs to the technical field of functional paint processing.
Background
China is a major consumer country of wood and wood products in the world, but is one of the countries with the least forest (wood) resources occupied by people. In the face of the current situation of shortage of natural forest wood resources and rapid development of wood product industry, the material selection approach of low-carbon and high-quality wood products must be expanded under the conditions of material sustainability and green manufacturing principle, and the development and utilization of fast-growing forest wood can effectively relieve the situation of wood resource shortage. Currently, the most effective modification methods for fast growing wood are surface coating modification and dipping modification.
Examples of the surface coating material include NC paint, UV paint, and water paint. Traditional NC coating and UV coating are mainly solvent-based, which wastes petroleum resources, releases a large amount of Volatile Organic Compounds (VOC) in the production and use processes and is a hazard to human health and natural environment. The water-based paint is an organic polymer paint taking water as a dispersion medium, and in the coating process, water gradually volatilizes to form an organic polymer coating. Due to the particularity of the wood base material, the coating of the water-based paint on the surface of the wood base material faces more technical problems than solvent-based paint, such as long film forming time, sensitivity to environmental temperature and humidity, poor water resistance of a paint film, low adhesion, easy cracking and the like, and the problems limit the development and the use of the water-based wood paint to a certain extent. In view of the above defects, many scientific research teams and enterprises at home and abroad have conducted a lot of research, and the performance of the water-based paint is improved through perfect functional modification by using inorganic modifiers, silane coupling agents, metal powder and the like, so that great progress is made, but the high-end requirements of customers cannot be met.
Due to the good strength, flexibility, electric conduction, heat conduction and optical characteristics of the graphene, the graphene is used for modifying the water-based paint in the prior art, and the mechanical property of the water-based paint is improved by utilizing the high strength characteristic of the graphene; in addition, the performance such as poor water resistance of the water-based paint is improved by applying the chemically modified biomass-derived multilayer flaky graphene nanomaterial to the water-based paint, but the graphene-modified water-based paint in the prior art still has the following defects: the problem of dispersibility of graphene in the water-based paint cannot be thoroughly solved, so that the water-based paint is poor in film forming uniformity and poor in adhesive force after being sprayed, and is easy to bulge, crack or peel off, and the application range and quality of the water-based paint are limited. The present invention aims to solve this technical problem.
Disclosure of Invention
One of the purposes of the invention is to solve the problem that the dispersibility of graphene in the water-based paint in the prior art cannot be completely solved, so that the defects that the film forming uniformity of the water-based paint after spraying is poor, the adhesive force is poor, the graphene is easy to bulge, crack or peel off, and the use range and the quality of the water-based paint are limited are overcome, and the graphene in the water-based paint is modified, so that the hydrophilicity and the dispersibility are remarkably improved, and the prepared water-based paint has good film forming uniformity and strong adhesive force after spraying, cannot bulge, and cannot crack or peel off.
The invention also aims to provide a preparation method of the graphene modified water-based paint.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the graphene modified water-based paint is composed of water-based paint and ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 3-8 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps:
pouring 70-85% of phosphoric acid by mass into a reactor, heating and stirring, adding urea when the temperature is raised to 75-80 ℃, synchronously adding organic bentonite and nano-graphene when the temperature is raised to 110-120 ℃, continuously raising the temperature to 130-135 ℃ after the addition is finished, stirring and reacting for 10-30min, then carrying out high-temperature treatment on the product at 180-200 ℃ for 1-2h, cooling to room temperature, and carrying out nano-crushing to obtain the ammonium polyphosphate-organic bentonite/graphene composite nano-material.
The ammonium polyphosphate is nontoxic and tasteless, does not generate corrosive gas, has small hygroscopicity, high thermal stability, more hydrophilic groups and excellent flame retardant property; the organic bentonite has good thixotropy, suspension stability, water resistance and chemical stability; the graphene has very good strength, flexibility, electric conductivity, heat conductivity and optical characteristics.
According to the technical scheme, phosphoric acid, urea and organic bentonite are used as raw materials, nano-scale graphene is used as a carrier, and the ammonium polyphosphate-organic bentonite/nano-graphene composite material is prepared through in-situ polymerization, so that the synergistic effect among the ammonium polyphosphate, the organic bentonite and the graphene can be fully exerted, the composite nano-material has good hydrophilicity and dispersibility, and the inherent performance of the graphene is also kept.
Compared with the nano graphene in the prior art, after the nano graphene with high specific surface area is loaded with ammonium polyphosphate and organic bentonite by a chemical method, the hydrophilicity and the dispersibility of the nano graphene can be improved by more than 20 times.
Preferably, the feeding mass ratio of the phosphoric acid to the urea to the organic bentonite to the nano-grade graphene is as follows: 1: 0.85-0.95: 0.1-0.2: 0.5-0.75.
Preferably, the pH value of the water-based paint is 7.8-8.2, and the water-based paint comprises the following components in parts by weight:
90-110 parts of distilled water, 22-24 parts of propanol, 44-48 parts of styrene-acrylic emulsion, 4-6 parts of film-forming additive, 6-10 parts of filler, 1-2 parts of defoaming agent and 0.25-0.75 part of water-insoluble glucan.
Preferably, the graphene modified water-based paint consists of a water-based paint and an ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 5 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, the pH value of the water-based paint is 8.0, and the water-based paint consists of the following components in parts by weight:
100 parts of distilled water, 24 parts of propanol, 48 parts of styrene-acrylic emulsion, 5 parts of film-forming additive, 8 parts of filler, 1.5 parts of defoaming agent and 0.5 part of water-insoluble glucan. The water-insoluble glucan is used as a large biomolecule, plays a role of a stabilizer in an alkaline water-based paint system, the water-based paint has stable quality, and after the ammonium polyphosphate-organic bentonite/nano graphene composite material is added, the water-based paint is crosslinked with active sites of the organic bentonite, so that the graphene modified water-based paint system is further stabilized.
Preferably, the film-forming aid is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
A preparation method of a graphene modified water-based paint is characterized by comprising the following steps: the preparation method comprises the following steps:
1) pouring 70-85% of phosphoric acid by mass into a reactor, heating and stirring, adding urea when the temperature is raised to 75-80 ℃, synchronously adding organic bentonite and nano-graphene when the temperature is raised to 110-120 ℃, continuously raising the temperature to 130-135 ℃ after the addition is finished, stirring and reacting for 10-30min, then carrying out high-temperature treatment on the product at 180-200 ℃ for 1-2h, cooling to room temperature, and carrying out nano-crushing to obtain the ammonium polyphosphate-organic bentonite/graphene composite nano-material;
2) heating the water-based paint with the formula amount to 40-50 ℃, pre-stirring for 20-30min, then adding the ammonium polyphosphate-organic bentonite/graphene composite nano material with the formula amount, and stirring for more than 30min at the rotating speed of not less than 1000rpm to obtain a graphene modified water-based paint semi-finished product;
3) and 2) performing ultrasonic-assisted reinforcement treatment on the stirred semi-finished product of the graphene modified water-based paint for 10-20min to obtain a finished product of the graphene modified water-based paint. The air in the water-based paint semi-finished product is fully removed by utilizing the cavity effect of ultrasonic waves, and meanwhile, the local agglomeration possibly existing in the stirring process is further destroyed, so that the water-based paint is more fully mixed and dispersed, and the uniformity of the graphene modified water-based paint is ensured.
Preferably, the feeding mass ratio of the phosphoric acid to the urea to the organic bentonite to the nano-grade graphene is as follows: 1: 0.85-0.95: 0.1-0.2: 0.5-0.75.
Preferably, the pH value of the water-based paint is 7.8-8.2, and the water-based paint comprises the following components in parts by weight:
90-110 parts of distilled water, 22-24 parts of propanol, 44-48 parts of styrene-acrylic emulsion, 4-6 parts of film-forming additive, 6-10 parts of filler, 1-2 parts of defoaming agent and 0.25-0.75 part of water-insoluble glucan.
Preferably, 5 parts by weight of ammonium polyphosphate-organobentonite/graphene composite nanomaterial is added to 100 parts by weight of the water-based paint, the pH of the water-based paint is 8.0, and the water-based paint comprises the following components in parts by weight:
100 parts of distilled water, 24 parts of propanol, 48 parts of styrene-acrylic emulsion, 5 parts of film-forming additive, 8 parts of filler, 1.5 parts of defoaming agent and 0.5 part of water-insoluble glucan.
Preferably, the film-forming aid is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
The invention has the beneficial effects that: the inventor creatively modifies the nano graphene by an in-situ polymerization method from three raw materials to prepare the ammonium polyphosphate-organobentonite/graphene composite nanomaterial with a composite function, wherein the composite function of the composite nanomaterial is embodied in at least two aspects: the hydrophilicity is obviously improved, and the mixing effect of the graphene and the water-based paint is greatly improved; the dispersibility is greatly improved, the ammonium polyphosphate-organobentonite/graphene composite nano material is highly dispersed in the water-based paint and cannot agglomerate, the film forming uniformity of the water-based paint is greatly improved, the adhesive force is strong, and the water-based paint cannot bulge or crack or peel.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples.
Example 1:
the graphene modified water-based paint is composed of water-based paint and ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 3 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps:
pouring 70% by mass of phosphoric acid into a reactor, heating and stirring, adding urea when the temperature rises to 75 ℃, synchronously adding organic bentonite and nanoscale graphene when the temperature rises to 110 ℃, continuously heating to 130 ℃ after the addition is finished, stirring and reacting for 10min, then treating the product at a high temperature of 180 ℃ for 2h, cooling to room temperature, and carrying out nano-crushing to obtain an ammonium polyphosphate-organic bentonite/graphene composite nano-material;
the feeding mass ratio of the phosphoric acid, the urea, the organic bentonite and the nano-grade graphene is as follows: 1: 0.85: 0.1: 05.
The pH value of the water-based paint is 7.8, and the water-based paint comprises the following components in parts by weight:
90 parts of distilled water, 22 parts of propanol, 44 parts of styrene-acrylic emulsion, 4 parts of film-forming additive, 6 parts of filler, 1 part of defoaming agent and 0.25 part of water-insoluble glucan.
The film-forming additive is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
The preparation method of the graphene modified water-based paint comprises the following steps:
1) heating the water-based paint with the formula amount to 40 ℃, pre-stirring for 30min, then adding the ammonium polyphosphate-organic bentonite/graphene composite nano material with the formula amount, and stirring for more than 30min at the rotating speed of not less than 1000rpm to obtain a graphene modified water-based paint semi-finished product;
2) and step 1), performing ultrasonic-assisted reinforcement treatment on the stirred semi-finished product of the graphene modified water-based paint for 10-20min to obtain a finished product of the graphene modified water-based paint.
Example 2:
the graphene modified water-based paint is composed of water-based paint and ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 8 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps:
pouring 85 mass percent of phosphoric acid into a reactor, heating and stirring, adding urea when the temperature rises to 80 ℃, synchronously adding organic bentonite and nanoscale graphene when the temperature rises to 120 ℃, continuously heating to 135 ℃ after the addition is finished, stirring and reacting for 30min, then treating the product at a high temperature of 200 ℃ for 1h, cooling to room temperature, and carrying out nano-crushing to obtain an ammonium polyphosphate-organic bentonite/graphene composite nano-material;
the feeding mass ratio of the phosphoric acid, the urea, the organic bentonite and the nano-grade graphene is as follows: 1: 0.95: 0.2: 0.75.
The pH value of the water-based paint is 8.2, and the water-based paint comprises the following components in parts by weight:
distilled water ll0 parts, propyl alcohol 24 parts, styrene-acrylic emulsion 48 parts, film-forming aid 6 parts, filler 10 parts, defoaming agent 2 parts, and water-insoluble glucan 0.75 part.
The film-forming additive is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
The preparation method of the graphene modified water-based paint comprises the following steps:
1) heating the water-based paint with the formula amount to 50 ℃, pre-stirring for 20min, then adding the ammonium polyphosphate-organic bentonite/graphene composite nano material with the formula amount, and stirring at the rotating speed of 2000rpm for more than 35min to obtain a graphene modified water-based paint semi-finished product;
2) and step 1), performing ultrasonic-assisted reinforcement treatment on the stirred semi-finished product of the graphene modified water-based paint for 20min to obtain a finished product of the graphene modified water-based paint.
Example 3
The graphene modified water-based paint is composed of a water-based paint and an ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 5 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps:
pouring phosphoric acid with the mass fraction of 80% into a reactor, heating and stirring, adding urea when the temperature rises to 80 ℃, synchronously adding organic bentonite and nanoscale graphene when the temperature rises to 115 ℃, continuously heating to 132 ℃ after the addition is finished, stirring and reacting for 20min, then treating the product at 190 ℃ for 1.5h at high temperature, cooling to room temperature, and carrying out nano crushing to obtain an ammonium polyphosphate-organic bentonite/graphene composite nano material;
the feeding mass ratio of the phosphoric acid, the urea, the organic bentonite and the nano-grade graphene is as follows: 1: 0.9: 0.15: 0.6.
Preferably, the pH of the water-based paint is 8.0, and the water-based paint comprises the following components in parts by weight:
100 parts of distilled water, 24 parts of propanol, 48 parts of styrene-acrylic emulsion, 5 parts of film-forming additive, 8 parts of filler, 1.5 parts of defoaming agent and 0.5 part of water-insoluble glucan.
The film-forming additive is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
The preparation method of the graphene modified water-based paint comprises the following steps:
1) heating the water-based paint with the formula amount to 45 ℃, pre-stirring for 25min, then adding the ammonium polyphosphate-organic bentonite/graphene composite nano material with the formula amount, and stirring for 42min at the rotating speed of 3000rpm to obtain a graphene modified water-based paint semi-finished product;
2) and step 1), performing ultrasonic-assisted reinforcement treatment on the stirred semi-finished product of the graphene modified water-based paint for 15min to obtain a finished product of the graphene modified water-based paint.
Evaluation of dispersibility of ammonium polyphosphate-organobentonite/graphene composite nanomaterial prepared in examples 1 to 3
1 sedimentation test method: the ammonium polyphosphate-organobentonite/graphene composite nano material prepared in the embodiment 1 to 3 is added into deionized water, 3g, 5g, 8g, 10g and 12g of samples of a material to be detected are respectively added into 100ml of deionized water, the samples are stirred for 30min at the rotating speed of 1000rpm, ultrasonic wave is used for assisting and strengthening the samples for 20min to form a uniform dispersion system, the uniform dispersion system is poured into a test tube with scales, whether the dispersion system is layered or not and the change of the upper layer along with the time are observed, and the specific data after the dispersion system is kept stand for 12h and 24h are observed as follows:
as can be seen from the test data in the table above, the ammonium polyphosphate-organobentonite/graphene composite nanomaterial prepared in examples 1-3 has good dispersibility when added into deionized water, and after being fully and uniformly mixed, the composite nanomaterial is continuously kept stand for more than 24 hours, and the sedimentation delamination is not obvious, and when the addition amount of 100ml reaches 10-12g, slight delamination exists but the phenomenon of delamination is not obvious.
In addition, the particle size distribution of the particles in the suspension was measured by a laser particle size analyzer, and the measured average particle size was equivalent to the primary particle size directly observed in the TEM photograph, which also proves that the ammonium polyphosphate-organobentonite/graphene composite nanomaterial prepared in examples 1-3 had good dispersibility when added to deionized water.
2. Sedimentation test method: evaluation of dispersibility of graphene-modified aqueous coating materials prepared in examples 1 to 3.
Respectively taking 100ml of each graphene modified water-based paint in the embodiments 1-3, adding the paint into a test tube with scales, observing whether a dispersion system is layered or not and the change of an upper layer along with time, and observing specific data after standing for 12h and 24h as follows:
1.3 examples 1-3 graphene modified waterborne coatings performance testing.
After standing for 24 hours, the graphene modified water-based paint prepared in the embodiments 1-3 is sampled according to the national standard GB3186, and a standard coating film is prepared according to the national standard GB1727, and various performance indexes of the coating film are tested. The storage stability was tested according to the method of GB 6753.3-86, the appearance of the coating was observed according to GB/T9755-200l, and the coating adhesion was tested according to the method of GB 1720-79.
Examples 1-3 storage stability test results for graphene-modified waterborne coatings are as follows:
| examples | Crusting and peculiar smell | Granule and rubber block | Settling velocity | Change in viscosity |
| Example 1 | Is free of | Is free of | Without sedimentation | Slight, less than 5% |
| Example 2 | Is free of | Is free of | Without sedimentation | Slight, less than 8% |
| Example 3 | Is free of | Is free of | Without sedimentation | Slight, less than 2% |
From the experimental results, the storage stability of the graphene modified water-based paint of examples 1-3 is good. The addition of the modified graphene composite nano material undoubtedly plays a crucial role, and the nano material can be well crosslinked with other components in the coating, so that the precipitation or delamination of the filler and other easily-deposited substances in the coating is effectively prevented.
Examples 1-3 performance test data for graphene-modified waterborne coatings are as follows:
as can be seen from the test results, the overall performance of the coatings of examples 1-3 is superior to that of the conventional water-borne coating. The drying time of the coating is greatly reduced, and the problems of poor storage stability, stain resistance, water resistance, film forming uniformity, low adhesive force and the like of the original water-based coating are well solved.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (1)
1. A graphene modified water-based paint is characterized in that: the graphene modified water-based paint consists of water-based paint and ammonium polyphosphate-organic bentonite/graphene composite nano material, wherein each 100 parts by weight of the water-based paint contains 5 parts by weight of the ammonium polyphosphate-organic bentonite/graphene composite nano material, and the preparation method of the ammonium polyphosphate-organic bentonite/graphene composite nano material comprises the following steps:
pouring phosphoric acid with the mass fraction of 80% into a reactor, heating and stirring, adding urea when the temperature rises to 80 ℃, synchronously adding organic bentonite and nanoscale graphene when the temperature rises to 115 ℃, continuously heating to 132 ℃ after the addition is finished, stirring and reacting for 20min, then treating the product at 190 ℃ for 1.5h at high temperature, cooling to room temperature, and carrying out nano crushing to obtain an ammonium polyphosphate-organic bentonite/graphene composite nano material; the phosphoric acid: urea: organic bentonite: the feeding mass ratio of the nano-grade graphene is as follows: 1: 0.9: 0.15: 0.6;
the pH value of the water-based paint is 8.0, and the water-based paint comprises the following components in parts by weight:
100 parts of distilled water, 24 parts of propanol, 48 parts of styrene-acrylic emulsion, 5 parts of a film-forming additive, 8 parts of a filler, 1.5 parts of a defoaming agent and 0.5 part of water-insoluble glucan;
the film-forming additive is alcohol ester-12, the filler is talcum powder, and the defoaming agent is butanol.
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