CN115368768A - Water-based environment-friendly strippable protective coating and preparation method thereof - Google Patents
Water-based environment-friendly strippable protective coating and preparation method thereof Download PDFInfo
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- CN115368768A CN115368768A CN202210498031.9A CN202210498031A CN115368768A CN 115368768 A CN115368768 A CN 115368768A CN 202210498031 A CN202210498031 A CN 202210498031A CN 115368768 A CN115368768 A CN 115368768A
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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
- C09D5/20—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—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
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
-
- 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
- C09D7/65—Additives macromolecular
-
- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a water-based environment-friendly strippable protective coating (IPC classification number: C09D 133/04), in particular to a water-based environment-friendly strippable protective coating and a use method thereof, wherein the water-based environment-friendly strippable protective coating comprises a component A and a component B: the component A comprises the following components in parts by mass: 15-25 parts of waterborne polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluorine natural rubber powder, 15-30 parts of filler, 0.3-1 part of defoaming agent, 1-2 parts of dispersing agent, 0.3-0.5 part of anti-flash rust agent, 0.1-1 part of toughening agent, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water; the component B is an isocyanate curing agent. The water-based environment-friendly peelable protective coating prepared by the invention can be embedded into the emulsion when being mixed in the system by adding the natural rubber powder with the fluorine content of 5-8% and matching the mutual synergistic effect between the modified polyurethane emulsion and the aqueous dispersion emulsion in the system, thereby ensuring that the prepared protective coating has better adaptability.
Description
Technical Field
The invention relates to a water-based environment-friendly peelable protective coating (IPC (International Industrial Standard): C09D), in particular to a water-based environment-friendly peelable protective coating and a preparation method thereof.
Background
In order to improve the construction and installation efficiency, more and more people adopt a field assembly mode of prefabricated parts, namely, workpieces are produced in a factory and transported to the field for assembly, the prefabricated parts/finished products are transported to the field for a long distance after being off-line from the factory, and the whole transportation process needs to be protected, so that the strippable coating with the protection effect can be produced at present. The strippable coating is a special protective coating, is coated on the surface of a substrate to isolate external erosion, avoids the influence of rusting, scraping, scratching, aging, pollution, dust, oil stain, fingerprints and the like in the production, transportation or storage process, can provide temporary protection for the surfaces of various substrates, such as substrates of woodware, metal, glass, plastic, concrete and the like, can be conveniently stripped from the surface of the substrate after the protection is finished, and does not generate negative influence on the surface of the substrate.
Chinese invention patent CN107828322B provides a water-based strippable paint, which is prepared from a film-forming material, a pigment, a filler, a thickening agent, a stripping agent, a wetting agent, a dispersing agent, a flatting agent, a defoaming agent and water. The film forming material is a mixture of a polyurethane film forming material and a polyvinyl alcohol film forming material, so that the phenomena of unsmooth film surface and air bubbles are easily caused in a specific experimental process, and particularly when the strippable coating is used on the surface of a base material such as steel, the flashover phenomenon is easily caused in the early stage, so that the anticorrosion effect of the strippable coating is lost, and the application of the strippable coating is greatly limited.
Disclosure of Invention
In order to solve the problems, the first aspect of the invention provides a water-based environment-friendly peelable protective coating, which comprises a component A and a component B:
the component A comprises the following components in parts by mass: 15-25 parts of waterborne polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluorine natural rubber powder, 15-30 parts of filler, 0.3-1 part of defoaming agent, 1-2 parts of dispersing agent, 0.3-0.5 part of anti-flash rust agent, 0.1-1 part of toughening agent, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water;
the component B is an isocyanate curing agent;
the mass ratio of the component A to the component B is (7-9): 1;
the aqueous dispersion emulsion at least comprises a strippable acrylic emulsion and a fluorine modified styrene-acrylic emulsion.
As a preferable scheme, the mass ratio of the peelable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is (3-4): 1.
as a preferred scheme, the fluorine modified styrene-acrylic emulsion is self-made; the preparation method of the fluorine modified styrene-acrylic emulsion comprises the following steps:
1) Preparing a core pre-emulsion A;
2) Preparing a shell pre-emulsion B;
3) Polymerizing the emulsion prepared in the steps 1) and 2).
As a preferred scheme, the preparation raw materials of the core pre-emulsion A comprise water, styrene and an emulsifier.
As a preferable scheme, the raw materials for preparing the shell pre-emulsion B comprise water, butyl acrylate, acrylic acid, N-hydroxymethyl acrylamide, a modifier and an emulsifier.
Further preferably, the preparation method of the fluorine modified styrene-acrylic emulsion specifically comprises the following steps:
1) Preparation of core pre-emulsion a: weighing a certain amount of water, styrene and mixed emulsifier (OP-10: SDS mass mixing ratio is 1: 3) and placing the mixture into a four-neck flask provided with a mechanical stirrer, a nitrogen inlet, a condenser and a pipette outlet for pre-emulsification;
2) Preparation of shell pre-emulsion B: weighing part of water, butyl acrylate, acrylic acid, N-hydroxymethyl acrylamide, a modifier (dodecafluoroheptyl methacrylate, GO 4) and the rest of mixed emulsifier, and placing the mixture into a flask for pre-emulsification.
3) Polymerization reaction: firstly, adding 1/3 of nuclear pre-emulsion A into a four-neck flask, heating to the reaction temperature, adding 4mL of initiator (ammonium persulfate), dropwise adding the rest of emulsion A after bluing light reaches 15min, finishing within 60min, and then preserving heat for 30min, wherein 1 drop of initiator (ammonium persulfate) is added every 15 min; after heat preservation, finishing dripping the emulsion B within 130min, and dripping an initiator every 15 min; heating to 85 ℃ for curing for 30min, cooling to below 50 ℃, adjusting the pH to 7-8 by adopting ammonia water, and removing slag to obtain the fluorine modified styrene-acrylic emulsion.
In a preferred embodiment, the aqueous polyurethane resin is an aqueous aliphatic polyurethane dispersion.
More preferably, the aqueous polyurethane resin is HT3630.
Preferably, the fluorine content of the fluorine natural rubber is 5-8% by mass.
Preferably, the particle size of the fluorine natural rubber is 0.5-1 μm.
As a preferred embodiment, the defoamer is a silicone defoamer, which is commercially available, for example, meyer SAG638.
As a preferable scheme, the filler is one or more of kaolin, barium sulfate, talcum powder, washing kaolin, ground calcium carbonate, silicon micropowder, silicon dioxide and diatomite.
As a preferred embodiment, the filler is a mixture of water-washed kaolin and ground calcium carbonate.
As a preferable scheme, the weight ratio of the water-washed kaolin to the heavy calcium carbonate is (10-25): (10-20).
As a preferable scheme, the weight ratio of the water-washed kaolin to the heavy calcium carbonate is (15-20): (14 to 16).
As a preferred embodiment, the dispersant is an ammonium acrylate dispersant, which is commercially available, for example, from the Dow chemical OROTAN1124.
As a preferable scheme, the toughening agent is a low molecular amide substance; further preferably, the toughening agent is carbamide.
The flash rust inhibitor described in the present invention is not particularly limited as long as it can achieve its flash rust preventive effect.
The second aspect of the invention provides a preparation method of a water-based environment-friendly peelable protective coating, which comprises the following steps:
1) Preparation of the component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) And mixing the component B and the component A according to the mass ratio to obtain the composition.
Has the advantages that: compared with the prior art, the water-based environment-friendly strippable protective coating prepared by the invention has the following advantages:
the water-based environment-friendly strippable protective coating prepared by the invention has excellent anticorrosion effect, particularly has better adhesive force when being used on the surface of steel, and avoids the phenomena of flash embroidery and the like in the early period; in addition, the water-based environment-friendly strippable protective coating prepared by the invention can be embedded into the emulsion when being mixed in the system by adding the natural rubber powder with the fluorine content of 5-8% and matching with the mutual synergistic effect between the modified polyurethane emulsion and the aqueous dispersion emulsion in the system, so that the prepared protective coating has better adaptability, better adhesive force, better aging resistance and tensile strength for the protective coating and the protective effect when the protective coating is used on the surfaces of various substrates are ensured.
Detailed Description
Examples
Example 1
The embodiment 1 of the invention provides a water-based environment-friendly peelable protective coating, which comprises a component A and a component B:
the component A comprises the following components in parts by mass: 20 parts of waterborne polyurethane resin, 25 parts of aqueous dispersion emulsion, 2 parts of fluorine natural rubber powder, 18 parts of filler, 0.5 part of defoaming agent, 1.5 parts of dispersing agent, 0.4 part of anti-flash rust agent, 0.6 part of toughening agent, 6 parts of aluminum tripolyphosphate and 26 parts of water;
the component B is an isocyanate curing agent;
the mass ratio of the component A to the component B is 8:1;
the peelable composite acrylic emulsion comprises the following raw materials in parts by weight: 10 parts of water, 60 parts of acrylic emulsion, 0.5 part of defoaming agent and 0.4 part of pH regulator.
The water dispersion emulsion comprises a peelable acrylic emulsion and a fluorine modified styrene-acrylic emulsion, wherein the mass ratio of the peelable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is 3.5:1;
among them, peelable acrylic emulsion type Carboset PL3127.
The fluorine modified styrene-acrylic emulsion is self-made, and the preparation method comprises the following steps:
1) Preparation of core pre-emulsion a: weighing 30 parts by mass of water, styrene and a mixed emulsifier (OP-10: SDS in a mass mixing ratio of 1: 3) in a mass ratio of 30;
2) Preparation of shell pre-emulsion B: weighing 15 parts of: 45:15: 5.
3) Polymerization reaction: firstly, adding 1/3 of nuclear pre-emulsion A into a four-neck flask, heating to 65 ℃, adding 4mL of initiator (ammonium persulfate), dropwise adding the rest of emulsion A after bluing for 15min, finishing within 60min, and then preserving heat for 30min, wherein 1 drop of initiator (ammonium persulfate) is added every 15 min; after heat preservation, finishing dripping the emulsion B within 130min, and dripping an initiator every 15 min; heating to 85 ℃ for curing for 30min, cooling to below 50 ℃, adjusting the pH to 7-8 by adopting ammonia water, and removing slag to obtain the fluorine modified styrene-acrylic emulsion.
The waterborne polyurethane resin is purchased from Hefu Hengtian New Material science and technology Co.
The fluorine natural rubber powder is of the brand
PPA 2626；
The filler is a mixture of water-washed kaolin and heavy calcium carbonate; the weight ratio of the washing kaolin to the heavy calcium carbonate is 18:15.
the defoamer was a silicone defoamer, purchased from mai panel SAG638.
The dispersant was an ammonium acrylate dispersant, available from dow chemical OROTAN1124.
The toughening agent is carbamide.
The second aspect of the invention provides a preparation method of a water-based environment-friendly peelable protective coating, which comprises the following steps:
1) Preparation of component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) And mixing the component B and the component A according to the mass ratio to obtain the composition.
Example 2
The specific implementation mode of the water-based environment-friendly strippable protective coating is the same as that in example 1, and is different from example 1 in that the mass ratio of the strippable acrylic emulsion to the fluorine-modified styrene-acrylic emulsion is 4:1.
example 3
The specific implementation mode of the water-based environment-friendly strippable protective paint is the same as that in example 1, and the difference from the example 1 is that the mass ratio of the strippable acrylic emulsion to the fluorine-modified styrene-acrylic emulsion is 3:1.
comparative example 1
The specific implementation manner of the water-based environment-friendly strippable protective paint is the same as that of example 1, except that the fluorine-free modified styrene-acrylic emulsion is not contained in comparative example 1.
Comparative example 2
The specific implementation mode of the water-based environment-friendly strippable protective paint is the same as that of example 1, except that no fluorine natural rubber powder exists in comparative example 2.
And (3) performance testing:
the basic properties of the aqueous environmentally friendly peelable protective coating obtained in example 1 are reported in table 1.
The water-based environment-friendly peelable protective coating obtained in the embodiment 1 is coated on the surfaces of different protective base materials, then placed for self-drying and curing, then a protective surface coating is coated, and the peeling grades of the different base materials are detected, and the description and the classification of the peeling grades are shown in table 2.
TABLE 2
And (3) performance test results:
table 1 shows the basic performance test results of the aqueous environmental protection peelable protective coating obtained in example 1.
TABLE 1
Table 3 shows the results of the peel rating tests of the coatings obtained in examples 1 to 3 and comparative examples 1 to 2 applied to different substrate surfaces, in Table 3.
TABLE 3
| Glass plate | Cold-rolled steel sheet | ABS plate | Wood board | Irregular stone | |
| Thickness/m | 75 | 75 | 75 | 75 | 80 |
| Example 1 | 1 | 1 | 1 | 1 | 1 |
| Example 2 | 1 | 1 | 1 | 1 | 1 |
| Example 3 | 1 | 1 | 1 | 1 | 1 |
| Comparative example 1 | 2 | 2 | 2 | 3 | 2 |
| Comparative example 2 | 2 | 3 | 2 | 2 | 2 |
Note: the protective coating needs to have proper stripping force and adhesive force, and meanwhile, when the stripping grade is grade 1 (complete stripping, easy stripping, no damage to a paint film and no residue on a substrate), the protective coating has the best performance.
Claims (10)
1. The water-based environment-friendly peelable protective coating is characterized by comprising a component A and a component B:
the component A comprises the following components in parts by mass: 15-25 parts of waterborne polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluorine natural rubber powder, 15-30 parts of filler, 0.3-1 part of defoaming agent, 1-2 parts of dispersing agent, 0.3-0.5 part of anti-flash rust agent, 0.1-1 part of toughening agent, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water;
the component B is an isocyanate curing agent;
the mass ratio of the component A to the component B is (7-9): 1;
the aqueous dispersion emulsion at least comprises a strippable acrylic emulsion and a fluorine modified styrene-acrylic emulsion.
2. The water-based environment-friendly peelable protective coating according to claim 1, wherein the mass ratio of the peelable acrylic emulsion to the fluorine-modified styrene-acrylic emulsion is (3-4): 1.
3. the water-based environment-friendly peelable protective coating according to claim 2, wherein the fluorine-modified styrene-acrylic emulsion is self-made; the preparation method of the fluorine modified styrene-acrylic emulsion comprises the following steps:
1) Preparing a core pre-emulsion A;
2) Preparing a shell pre-emulsion B;
3) Polymerizing the emulsion prepared in the steps 1) and 2).
4. The aqueous environment-friendly peelable protective coating according to claim 3, wherein the core pre-emulsion A is prepared from raw materials comprising water, styrene and an emulsifier.
5. The aqueous environment-friendly peelable protective coating according to claim 3, wherein the shell pre-emulsion B is prepared from raw materials including water, butyl acrylate, acrylic acid, N-methylolacrylamide, modifier and emulsifier.
6. The aqueous environment-friendly peelable protective coating according to claim 1 or 2 wherein the peelable acrylic emulsion is selected from at least one of Carboset PL3127 and Carboset PL-958.
7. The aqueous environment-friendly peelable protective coating according to claim 1, wherein the aqueous polyurethane resin is an aqueous aliphatic polyurethane dispersion.
8. The water-based environment-friendly peelable protective coating according to claim 1, wherein the mass content of fluorine in the fluororubber is 5 to 8%.
9. The water-based environment-friendly peelable protective coating according to claim 8, wherein the particle size of the fluororubber is 5 to 10 μm.
10. A method for preparing the water-based environment-friendly peelable protective coating according to any one of claims 1 to 9, comprising the following steps:
1) Preparation of component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) And mixing the component B and the component A according to the mass ratio to obtain the composition.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116179067A (en) * | 2023-03-15 | 2023-05-30 | 上海振华重工(集团)股份有限公司 | Strippable coating and preparation method thereof |
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| CN113004758A (en) * | 2020-12-29 | 2021-06-22 | 东华大学 | Core-shell type acrylate strippable coating and preparation method thereof |
| CN114450359A (en) * | 2019-09-27 | 2022-05-06 | 日东电工株式会社 | Peelable coating film, coating composition, and coating material for forming hydrophilic coating film |
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| US5747572A (en) * | 1995-05-19 | 1998-05-05 | Kansai Paint Co., Ltd. | Releasable aqueous coating composition and method of temporarily protecting finished coating film on automobile body by use of the same |
| US20090130454A1 (en) * | 2005-07-29 | 2009-05-21 | Fumitoshi Ogino | Strippable Floor Coating and Method of Forming the Coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116179067A (en) * | 2023-03-15 | 2023-05-30 | 上海振华重工(集团)股份有限公司 | Strippable coating and preparation method thereof |
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