CN111748259A - Water-based paint for container and preparation method thereof - Google Patents
Water-based paint for container and preparation method thereof Download PDFInfo
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- CN111748259A CN111748259A CN201910244029.7A CN201910244029A CN111748259A CN 111748259 A CN111748259 A CN 111748259A CN 201910244029 A CN201910244029 A CN 201910244029A CN 111748259 A CN111748259 A CN 111748259A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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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- 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
- C09D133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
Abstract
The invention discloses a water-based paint for a container, which consists of a main agent and a curing agent; and the water-based paint comprises a water-based epoxy zinc-rich primer, a water-based epoxy intermediate paint/inner finish paint and a water-based acrylic outer finish paint. The water-based epoxy anticorrosive paint prepared by the invention uses environment-friendly antirust pigment without heavy metals containing lead, chromium and the like, and the obtained product has low VOC, is non-combustible and non-explosive and does not contain toxic and harmful substances such as benzene, xylene and the like; the water-based epoxy anticorrosive paint prepared by the invention has wide application range, is suitable for containers, and is also suitable for industries such as modified cars, dump trucks, engineering machinery and the like.
Description
Technical Field
The invention relates to the technical field of water-based industrial coatings, in particular to a water-based coating for a container and a preparation method thereof.
Background
The container manufacturing industry, as an important application area for coatings, is demanding over 30 million tons of coating every year. At present, most of container coatings are solvent-based products, although the solvent-based container coatings completely meet the requirements of the container coatings at the present stage in the aspects of box body protection, high-rhythm construction, cost advantage and the like. However, about 40% of solvent-based container paint components are organic solvents, and in the process of container painting, in order to ensure smooth construction and achieve the expected painting effect, about 20% of organic solvents are added into the paint before construction to serve as diluents, and all the organic solvents are volatilized into the atmosphere in the processes of painting construction and drying and curing of a coating film, so that the construction environment and the atmospheric environment are seriously polluted; along with the aggravation of haze in recent years, governments and the public pay attention to environmental protection, and the problems of pollution, damage and the like of a large amount of volatile solvents released in the construction process to the environment are concerned more.
In recent years, with the increasing importance of society on environmental protection and the progress of water-based technology of paint, the research and development and popularization of water-based container paint are greatly accelerated. The existing water-based container paint mainly has the following problems: firstly, the construction rhythm problem is solved, the continuous construction of 'wet-on-wet' of the water-based epoxy intermediate paint and the water-based acrylic acid outer paint is difficult to realize like a solvent-based container paint, and if the water-based acrylic acid finish paint is sprayed before the surface of the water-based epoxy intermediate paint is not dried and is preliminarily crosslinked, the finish paint is easy to crack; secondly, most of raw materials related to the water-based container coating are new technical products, the technical added value is high, the price is difficult to reduce before large-scale popularization and application, particularly the water-based epoxy emulsion playing an important role in a formula, and the market price of the current water-based epoxy emulsion is about twice of the price of solvent-based epoxy resin, so that the cost of the water-based container coating is directly increased, and certain obstacles are caused to large-scale popularization and application of the water-based container coating; although the construction safety of the water-based container coating is superior to that of the solvent-based container coating, the water-based container coating needs to be stored and transported at the temperature of more than 0 ℃, and is a disadvantage compared with the solvent-based container coating.
Therefore, the problem to be solved by those skilled in the art is how to provide a water-based paint for containers, which has excellent performance, is environmentally friendly, and has a good anti-corrosion effect.
Disclosure of Invention
In view of the above, the invention provides a water-based paint for a container and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water-based paint for containers is composed of a main agent and a curing agent; the water-based paint comprises water-based epoxy zinc-rich primer, water-based epoxy intermediate paint/inner finish paint and water-based acrylic acid outer finish paint; wherein the content of the first and second substances,
the water-based epoxy zinc-rich primer comprises the following main agents in percentage by mass: 5-15% of water-based epoxy resin, 5-15% of environment-friendly solvent, 0.3-1.5% of dispersant, 0.5-2.0% of organic bentonite and 60-90% of zinc powder; the curing agent comprises the following components in percentage by mass: 3-8% of water-based epoxy curing agent and 10-20% of deionized water;
the water-based epoxy intermediate paint/inner paint main agent comprises the following components in percentage by mass: 35-55% of water-based epoxy emulsion, 0.3-1.5% of dispersant, 0.8-2.5% of epoxy diluent, 1.5-3.5% of environment-friendly solvent, 10-20% of pigment, 15-35% of filler, 0.1-0.5% of thickening agent, 0.1-0.5% of flatting agent and 8-20% of deionized water; the curing agent comprises the following components in percentage by mass: 6.0-8.0% of waterborne epoxy curing agent and 15-20% of deionized water;
the water-based acrylic acid external finish paint comprises the following components in percentage by mass: 35-65% of water-based acrylic emulsion, 0.3-3% of dispersant, 1-10% of cosolvent, 0.01-0.3% of defoaming agent, 0.1-1.0% of flatting agent, 0.1-1.0% of flash rust inhibitor, 0.1-1.0% of thickening agent, 5-25% of pigment, 15-35% of filler and 2.0-6.0% of deionized water.
The coating forming principle of the water-based paint for the container obtained by adopting the technical scheme is as follows:
after the water-based paint for the container is coated, water is quickly volatilized under a proper condition, after most of the water is volatilized, the dispersed phase particles are close to each other and are closely stacked, a small amount of residual water is filled in gaps among the latex particles to form a huge capillary pressure, and the latex particles close to each other and stacked are deformed into a hexagonal structure under the capillary pressure. The aqueous epoxy resin and the partially cured epoxy resin interdiffuse among the latex particles until a uniform, continuous coating film is formed.
The coating system disclosed by the invention is basically matched with the existing solvent type container coating system. The interior of the box body is matched with the epoxy zinc-rich primer and the epoxy inner paint, and the exterior of the box body is matched with the epoxy zinc-rich primer, the epoxy intermediate paint and the acrylic outer paint. The water-based paint for the container is prepared by respectively carrying out water-based treatment on corresponding products from the layer of film-forming substances, and the corrosion resistance and the weather resistance of a matching system are tested by practical application in recent years and are widely accepted by container manufacturers, users and paint suppliers. Compared with solvent-based paint, the water-based paint can reduce the VOC (volatile organic compound) content in the atmosphere by 90%, and meanwhile, the anti-corrosion performance of the water-based paint also exceeds the index parameters of the solvent-based zinc-rich primer.
Preferably, in the water-based paint for containers, the main agent composition of the water-based epoxy zinc-rich primer and the mass fractions of the substances in the main agent are as follows: 8-12% of water-based epoxy resin, 8-14% of environment-friendly solvent, 0.5-1.0% of dispersant, 0.8-1.5% of organic bentonite and 65-85% of zinc powder; the curing agent comprises the following components in percentage by mass: 5-7% of water-based epoxy curing agent and 12-15% of deionized water.
Preferably, in the above water based paint for containers, the zinc powder content is 75-80%.
The zinc powder is an active pigment with good antirust property and atmospheric corrosion resistance, the electrode potential (-0.7628V) of the zinc is lower than that of iron (-0.409V), when water enters a coating film, the zinc powder and a steel plate form a microcell, corrosion current flows from the zinc to the iron, and the steel plate is subjected to cathodic protection. Meanwhile, zinc salt generated by corrosion of zinc powder can be filled in pores of the coating to seal damaged parts of the coating, protect zinc particles on the lower layer, delay corrosion of the zinc particles and further protect the steel plate below.
The salt spray resistance of the paint film is obviously improved along with the increase of the content of the zinc powder, but after a certain critical point is exceeded, the salt spray resistance of the paint film is reduced. This is because the resin content in the zinc-rich primer is reduced with the increase of the amount of zinc powder, the film-forming substance is relatively reduced, and when a certain critical point is reached, the resin is insufficient to coat all the zinc powder, so that a continuous and dense coating film cannot be formed, resulting in the change of various properties of the coating film. According to the test results, it is found that when the zinc powder content in the formulation exceeds 80%, the various properties of the paint film are reduced. In comprehensive consideration, the zinc powder content is most suitable to be 75-80%.
Preferably, in the above water-based paint for containers, the composition of the main agent of the water-based epoxy intermediate paint/inner paint and the mass fractions of the substances in the main agent are as follows: 40-50% of water-based epoxy emulsion, 0.5-1.0% of dispersant, 1.0-2.0% of epoxy diluent, 2.0-3.0% of environment-friendly solvent, 14-18% of pigment, 20-31% of filler, 0.1-0.3% of thickener, 0.1-0.3% of flatting agent and 10-15% of deionized water; the curing agent comprises the following components in percentage by mass: 6.3 to 7.5 percent of waterborne epoxy curing agent and 16 to 18 percent of deionized water.
Preferably, in the water-based paint for containers, the water-based acrylic external finish paint comprises the following components in percentage by mass: 40-60% of water-based acrylic emulsion, 0.5-2% of dispersant, 2-8% of cosolvent, 0.05-0.2% of defoaming agent, 0.1-0.5% of flatting agent, 0.1-0.5% of flash rust inhibitor, 0.1-0.5% of thickening agent, 10-20% of pigment, 20-30% of filler and 2.4-5.0% of deionized water.
Preferably, in the above water-based paint for containers, the water-based epoxy resin is STW 600.
The invention selects the STW600 waterborne epoxy resin, introduces part of hydrophilic chain segments into the bisphenol A epoxy resin, and ensures that the resin has certain hydrophilicity and also has the adhesive force of the bisphenol A epoxy resin to metal substrates. It can be well mixed with zinc powder and the zinc powder can be pre-dispersed in the resin, which avoids the problems caused by uneven dispersion of the zinc powder.
In addition, the low molecular weight epoxy resin modified by fatty acid is selected, so that the viscosity of the coating can be reduced, and the coating is favorable for spraying construction; meanwhile, the hydrophilicity of the coating is effectively improved, and the antifouling capability of the surface of the coating is improved.
Preferably, in the above one container water-based paint, the water-based epoxy emulsion is STW 612.
It should be noted that the flexibility and adhesion of the dimer acid-modified epoxy emulsion STW612 are comparable to the STW602 epoxy emulsion, but the impact resistance (back-flushing) is better than the STW602 emulsion, mainly because the dimer acid provides good toughness, adhesion and sealing.
According to the invention, STW612 (polyacid modified epoxy emulsion) is selected as a film forming material, so that a paint film can have good toughness and corrosion resistance.
Preferably, in the above water-based paint for containers, the water-based epoxy hardener is STW7396, and the water-based acrylic emulsion is STW 8765.
The inventors compared by selecting 2 emulsions STW168 (aqueous hydroxypropyl emulsion) and STW8765 (aqueous styrene-acrylic emulsion). Although the paint films prepared from the two emulsions have little difference in adhesive force and flexibility, the paint film prepared from the STW168 has higher hardness, certain brittleness and weaker impact resistance. Meanwhile, the STW168 needs to be mixed with a curing agent for use, so that the shelf life is short. Although the STW8765 belongs to the thermoplastic styrene-acrylic emulsion, the coating film has good appearance and mechanical property, and also has certain corrosion resistance and moist heat resistance. For comprehensive consideration, the base material is preferably STW8765 emulsion.
In addition, the invention adopts STW7396 as a curing agent, and can obtain an ultra-long pot life.
Preferably, in the above water-based paint for containers, the anti-settling agent is degussa gas-phase SiO2。
The invention selectsOrganic bentonite and gas phase SiO2Used as an anti-settling agent of the water-based epoxy zinc-rich primer. Adding proper amount of gas phase SiO2Is due to SiO2The molecular structure of the zinc-based coating contains a plurality of hydrogen bonds, and a three-dimensional network structure is easily formed in the coating system, so that the sedimentation of zinc powder can be effectively slowed down, and the coating is endowed with good leveling property and sag resistance.
Wherein, 1 percent of organic bentonite is matched with 0.5 percent of gas phase silicon dioxide, which can effectively solve the problems of zinc powder sedimentation and agglomeration in the water-based epoxy zinc-rich primer.
Preferably, in the water-based paint for containers, the defoaming agent is BYK-019 or BYK-024.
The water-based paint for the container disclosed by the invention mainly takes water as a dispersion medium, and because the surface tension of the water is higher, the wetting capacity of the paint filler and the base material is poorer, and low-surface-tension active substances such as a dispersing agent, a flatting agent and the like need to be added. The addition of low surface tension active substances causes the formation of foam, and therefore, the addition of defoaming agents is required. In addition, an anti-settling agent and a thickening agent are required to improve the storage stability and workability of the coating.
The invention also aims to provide a preparation method of the water-based paint for the container.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a water-based paint for a container specifically comprises the following steps:
(1) preparing a main agent;
(2) preparing a curing agent;
(3) preparing paint according to the mass ratio of the main agent to the curing agent, and then uniformly stirring to obtain the water-based paint for the container.
Preferably, in the step one, the specific preparation process of the main agent is as follows:
(1) weighing the components according to the mass percentage of claim 1, adding deionized water into a container, slowly adding a dispersing agent, and stirring at the speed of 200-300 r/min for 5-10 min;
(2) adding a pH value regulator, regulating the pH value to 7.5-9.0, then slowly adding the rest components, and stirring for 15-20 min to obtain the main agent.
Preferably, in the second step, the concrete preparation process of the curing agent is as follows:
weighing the components according to the mass percentage of claim 1, selecting a container, adding deionized water, adding the water-based epoxy curing agent at a speed of 450-650 r/min, and then stirring for 10-20 min to finally obtain the curing agent.
According to the technical scheme, compared with the prior art, the invention discloses and provides the water-based paint for the container and the preparation method thereof, and compared with the prior art, the water-based paint for the container has the following advantages:
1. according to the invention, the salt spray resistance of a paint film is obviously improved by combining the water-based epoxy resin and the zinc powder, and the STW612 (polyacid modified epoxy emulsion) is used as a film forming material, so that the paint film has good toughness and corrosion resistance.
2. The water-based paint for containers disclosed by the invention has the advantages that the cost of raw materials is low, advanced equipment is not needed in the preparation process, the operation is simple and convenient, and the water-based paint is suitable for large-scale production of the water-based epoxy anticorrosive paint.
3. The product can meet the wet-on-wet construction process, namely after the water-based epoxy intermediate paint is sprayed on a preheated workpiece (at the temperature of 25-40 ℃), the water-based acrylic acid outer finish paint can be directly sprayed after 1-2 min; the water-based epoxy anticorrosive paint prepared by the invention has wide application range, and is not only suitable for containers, but also suitable for industries such as modified cars, dump trucks, engineering machinery and the like.
4. The water-based epoxy anticorrosive paint prepared by the invention uses environment-friendly antirust pigment without heavy metals containing lead, chromium and the like, and the product has low VOC, is non-combustible and non-explosive and does not contain toxic and harmful substances such as benzene, xylene and the like; waterborne coatings can reduce the VOC content of the atmosphere by 90% relative to solvent-based coatings.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a water-based paint for a container and a preparation method thereof.
The present invention will be further specifically illustrated by the following examples for better understanding, but the present invention is not to be construed as being limited thereto, and certain insubstantial modifications and adaptations of the invention by those skilled in the art based on the foregoing disclosure are intended to be included within the scope of the invention.
The invention discloses a water-based paint for a container, which consists of a main agent and a curing agent; the water-based paint comprises water-based epoxy zinc-rich primer, water-based epoxy intermediate paint/inner finish paint and water-based acrylic acid outer finish paint; wherein the content of the first and second substances,
the water-based epoxy zinc-rich primer comprises the following main agents in percentage by mass: 5-15% of water-based epoxy resin, 5-15% of environment-friendly solvent, 0.3-1.5% of dispersant, 0.5-2.0% of organic bentonite and 60-90% of zinc powder; the curing agent comprises the following components in percentage by mass: 3-8% of water-based epoxy curing agent and 10-20% of deionized water;
the water-based epoxy intermediate paint/inner paint main agent comprises the following components in percentage by mass: 35-55% of water-based epoxy emulsion, 0.3-1.5% of dispersant, 0.8-2.5% of epoxy diluent, 1.5-3.5% of environment-friendly solvent, 10-20% of pigment, 15-35% of filler, 0.1-0.5% of thickening agent, 0.1-0.5% of flatting agent and 8-20% of deionized water; the curing agent comprises the following components in percentage by mass: 6.0-8.0% of waterborne epoxy curing agent and 15-20% of deionized water;
the water-based acrylic acid external finish paint comprises the following components in percentage by mass: 35-65% of water-based acrylic emulsion, 0.3-3% of dispersant, 1-10% of cosolvent, 0.01-0.3% of defoaming agent, 0.1-1.0% of flatting agent, 0.1-1.0% of flash rust inhibitor, 0.1-1.0% of thickening agent, 5-25% of pigment, 15-35% of filler and 2.0-6.0% of deionized water.
In order to further optimize the technical scheme, the waterborne epoxy resin is STW600, and the waterborne epoxy emulsion is STW 612.
In order to further optimize the technical scheme, the waterborne epoxy curing agent is STW7396, and the waterborne acrylic emulsion is STW 8765.
In order to further optimize the technical scheme, the anti-settling agent is Degussa gas-phase SiO2The defoaming agent is BYK-019 or BYK-024.
The invention also discloses a preparation method of the water-based paint for the container, which comprises the following steps:
the technical solution of the present invention will be further described with reference to the following specific examples.
Wherein examples 1 to 3 are examples when the water-based paint for containers is a water-based epoxy zinc-rich primer, examples 4 to 6 are examples when the water-based paint for containers is a water-based epoxy intermediate paint/inner finish paint, and examples 7 to 9 are examples when the water-based paint for containers is a water-based acrylic outer finish paint. The specific contents are as follows:
example 1:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 6% of water-based epoxy resin, 8% of environment-friendly solvent, 0.5% of dispersant, 0.8% of organic bentonite and 70% of zinc powder; the curing agent comprises the following components in percentage by mass: 5% of water-based epoxy curing agent and 10% of deionized water.
Example 2:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 10% of water-based epoxy resin, 8% of environment-friendly solvent, 0.6% of dispersant, 1.0% of organic bentonite and 60% of zinc powder; the curing agent comprises the following components in percentage by mass: 6% of water-based epoxy curing agent and 14% of deionized water.
Example 3:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 15% of water-based epoxy resin, 14% of environment-friendly solvent, 1.2% of dispersant, 1.5% of organic bentonite and 65% of zinc powder; the curing agent comprises the following components in percentage by mass: 5% of water-based epoxy curing agent and 18% of deionized water.
Example 4:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 40% of water-based epoxy emulsion, 0.5% of dispersant, 1.0% of epoxy diluent, 1.5% of environment-friendly solvent, 12% of pigment, 18% of filler, 0.2% of thickener, 0.3% of flatting agent and 10% of deionized water; the curing agent comprises the following components in percentage by mass: 6% of water-based epoxy curing agent and 12% of deionized water;
example 5:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 45% of water-based epoxy emulsion, 1.2% of dispersant, 0.8% of epoxy diluent, 1.5% of environment-friendly solvent, 15% of pigment, 15% of filler, 0.2% of thickening agent, 0.3% of flatting agent and 12% of deionized water; the curing agent comprises the following components in percentage by mass: 8.0 percent of waterborne epoxy curing agent and 20 percent of deionized water.
Example 6:
a water-based paint for containers is composed of a main agent and a curing agent; the main agent comprises the following components in percentage by mass: 50% of water-based epoxy emulsion, 1.5% of dispersant, 2.5% of epoxy diluent, 3.5% of environment-friendly solvent, 20% of pigment, 15% of filler, 0.3% of thickening agent, 0.2% of flatting agent and 8% of deionized water; the curing agent comprises the following components in percentage by mass: 6.0 percent of waterborne epoxy curing agent and 15 percent of deionized water.
Example 7:
the water-based paint for the containers comprises the following components in percentage by mass in a main agent: 40% of water-based acrylic emulsion, 2% of dispersant, 8% of cosolvent, 0.2% of defoaming agent, 0.3% of flatting agent, 0.3% of anti-flash rust agent, 0.2% of thickening agent, 20% of pigment, 20% of filler and 9% of deionized water
Example 8:
the water-based paint for the containers comprises the following components in percentage by mass in a main agent: 50% of water-based acrylic emulsion, 3% of dispersant, 2% of cosolvent, 0.3% of defoaming agent, 0.2% of flatting agent, 0.3% of anti-flash rust agent, 0.2% of thickening agent, 21% of pigment, 20% of filler and 3% of deionized water.
Example 9:
the water-based paint for the containers comprises the following components in percentage by mass in a main agent: 60% of water-based acrylic emulsion, 1.2% of dispersant, 7% of cosolvent, 0.3% of defoaming agent, 0.5% of flatting agent, 0.5% of flash rust inhibitor, 0.5% of thickening agent, 10% of pigment, 25% of filler and 5.0% of deionized water.
The preparation method of the water-based paint for the container specifically comprises the following steps:
the method comprises the following steps: preparation of the main agent:
(1) weighing the components according to the mass percentage, firstly adding deionized water into a container, slowly adding a dispersing agent, and stirring at the speed of 200-300 r/min for 5-10 min;
(2) adding a pH value regulator, regulating the pH value to 7.5-9.0, then slowly adding the rest components, and stirring for 15-20 min to obtain a main agent;
step two: preparation of the curing agent: weighing the components according to the mass percentage, selecting a container, adding deionized water, adding the water-based epoxy curing agent at the speed of 450-650 r/min, and then stirring for 10-20 min to finally obtain the curing agent.
Step three: and (2) preparing the main agent and the curing agent according to the mass ratio of 1 (1-2), and then uniformly stirring to obtain the water-based paint for the container.
The water-based paint for the container is prepared by the formula disclosed in the embodiments 1-9 according to the preparation method, and experimental tests are carried out on the water-based paint to verify the effect of the invention.
1. Memory performance testing
Tests prove that the storage period of the water-based paint for the container disclosed by the invention is as long as 3 years, and the storage performance of the water-based paint is more stable than that of a common water-based paint.
2. Antibacterial and antifungal properties
Tests prove that the antibacterial performance and antibacterial lasting performance of the waterborne coating for the container disclosed by the invention are both as high as 99%, and the antifungal performance and the antibacterial lasting performance of the waterborne coating for the container both reach the highest level-0 of HG/T3950-2007, and the waterborne coating for the container disclosed by the invention has more excellent antibacterial and antifungal performance compared with a common waterborne coating.
3. Salt water resistance
After the container water-based paint prepared by the method disclosed by the invention is compared with a common water-based paint, the container water-based paint is found to have the advantages of rust resistance and atmospheric corrosion resistance, no bubbling in 48 hours, no rusting and excellent salt water resistance.
In addition, the invention has the effects of environmental protection and no environmental pollution, and is the development direction of the water-based paint for the containers in the future.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The water-based paint for the container is characterized by consisting of a main agent and a curing agent; the water-based paint comprises water-based epoxy zinc-rich primer, water-based epoxy intermediate paint/inner finish paint and water-based acrylic acid outer finish paint; wherein the content of the first and second substances,
the water-based epoxy zinc-rich primer comprises the following main agents in percentage by mass: 5-15% of water-based epoxy resin, 5-15% of environment-friendly solvent, 0.3-1.5% of dispersant, 0.5-2.0% of organic bentonite and 60-90% of zinc powder; the curing agent comprises the following components in percentage by mass: 3-8% of water-based epoxy curing agent and 10-20% of deionized water;
the water-based epoxy intermediate paint/inner paint main agent comprises the following components in percentage by mass: 35-55% of water-based epoxy emulsion, 0.3-1.5% of dispersant, 0.8-2.5% of epoxy diluent, 1.5-3.5% of environment-friendly solvent, 10-20% of pigment, 15-35% of filler, 0.1-0.5% of thickening agent, 0.1-0.5% of flatting agent and 8-20% of deionized water; the curing agent comprises the following components in percentage by mass: 6.0-8.0% of waterborne epoxy curing agent and 15-20% of deionized water;
the water-based acrylic acid external finish paint comprises the following components in percentage by mass: 35-65% of water-based acrylic emulsion, 0.3-3% of dispersant, 1-10% of cosolvent, 0.01-0.3% of defoaming agent, 0.1-1.0% of flatting agent, 0.1-1.0% of flash rust inhibitor, 0.1-1.0% of thickening agent, 5-25% of pigment, 15-35% of filler and 2.0-6.0% of deionized water.
2. The water-based paint for the container as claimed in claim 1, wherein the water-based epoxy zinc-rich primer comprises the following main agents in percentage by mass: 8-12% of water-based epoxy resin, 8-14% of environment-friendly solvent, 0.5-1.0% of dispersant, 0.8-1.5% of organic bentonite and 65-85% of zinc powder; the curing agent comprises the following components in percentage by mass: 5-7% of water-based epoxy curing agent and 12-15% of deionized water.
3. The water-based paint for the container as claimed in claim 2, wherein the composition of the water-based epoxy intermediate paint/inner paint main agent and the mass fraction of each substance in the main agent are as follows: 40-50% of water-based epoxy emulsion, 0.5-1.0% of dispersant, 1.0-2.0% of epoxy diluent, 2.0-3.0% of environment-friendly solvent, 14-18% of pigment, 20-31% of filler, 0.1-0.3% of thickener, 0.1-0.3% of flatting agent and 10-15% of deionized water; the curing agent comprises the following components in percentage by mass: 6.3-7.5% of water-based epoxy curing agent and 16-18% of deionized water.
4. The water-based paint for the container as claimed in claim 3, wherein the water-based acrylic external finish paint comprises the following components in percentage by mass: 40-60% of water-based acrylic emulsion, 0.5-2% of dispersant, 2-8% of cosolvent, 0.05-0.2% of defoaming agent, 0.1-0.5% of flatting agent, 0.1-0.5% of flash rust inhibitor, 0.1-0.5% of thickening agent, 10-20% of pigment, 20-30% of filler and 2.4-5.0% of deionized water.
5. A water-based paint for containers as claimed in any one of claims 1 to 4, wherein the water-based epoxy resin is STW600 and the water-based epoxy emulsion is STW 612.
6. The water-based paint for containers as claimed in any one of claims 1 to 5, wherein the water-based epoxy hardener is STW7396, and the water-based acrylic emulsion is STW 8765.
7. The water-based paint for containers as claimed in any one of claims 1 to 6, wherein the anti-settling agent is Degussa gas phase SiO2The defoaming agent is BYK-019 or BYK-024.
8. The preparation method of the water-based paint for the container is characterized by comprising the following steps:
the method comprises the following steps: preparing a main agent;
step two: preparing a curing agent;
step three: and (2) preparing the main agent and the curing agent according to the mass ratio of 1 (1-2), and then uniformly stirring to obtain the water-based paint for the container.
9. The preparation method of the water-based paint for the container as claimed in claim 8, wherein in the first step, the specific preparation process of the main agent is as follows:
(1) weighing the components according to the mass percentage of claim 1, adding deionized water into a container, slowly adding a dispersing agent, and stirring at the speed of 200-300 r/min for 5-10 min;
(2) adding a pH value regulator, regulating the pH value to 7.5-9.0, then slowly adding the rest components, and stirring for 15-20 min to obtain the main agent.
10. The preparation method of the water-based paint for the container as claimed in claim 8, wherein in the second step, the concrete preparation process of the curing agent is as follows:
weighing the components according to the mass percentage of claim 1, selecting a container, adding deionized water, adding the water-based epoxy curing agent at a speed of 450-650 r/min, and then stirring for 10-20 min to finally obtain the curing agent.
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| CN201910244029.7A CN111748259A (en) | 2019-03-28 | 2019-03-28 | Water-based paint for container and preparation method thereof |
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| CN115851075A (en) * | 2022-12-09 | 2023-03-28 | 洛阳双瑞防腐工程技术有限公司 | Water-based epoxy sealing coating for sealing inorganic zinc-rich surface and preparation method thereof |
| CN116496677A (en) * | 2023-04-25 | 2023-07-28 | 广州境好新材料有限公司 | Thermosetting container water-based epoxy zinc-rich paint and preparation method thereof |
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