CN110684450A - Water-based protective coating with stripping property and preparation method thereof - Google Patents
Water-based protective coating with stripping property and preparation method thereof Download PDFInfo
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- CN110684450A CN110684450A CN201910910768.5A CN201910910768A CN110684450A CN 110684450 A CN110684450 A CN 110684450A CN 201910910768 A CN201910910768 A CN 201910910768A CN 110684450 A CN110684450 A CN 110684450A
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
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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
- 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
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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
- C09D7/63—Additives non-macromolecular organic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The invention provides a water-based protective coating with stripping property and a preparation method thereof, belonging to the field of coatings. The water-based protective coating with stripping performance provided by the invention comprises the following components in parts by weight: 40-80 parts of polyurethane emulsion, 0.5-2 parts of mildew preventive, 5-15 parts of film forming additive, 0.1-2 parts of rheological control agent and 0.15-3 parts of surface control additive. The water-based protective coating group with stripping performance provided by the invention has the advantages of relatively quick drying time and mild drying conditions, and is suitable for various different base materials; the paint film of the cured paint has good tensile strength and extensibility, and is convenient to be integrally stripped from the original paint layer or the original substrate layer; the coating has good flexibility after being cured, and has good scratch and scratch resistance; meanwhile, the coating has certain flame retardant property after being cured, and has good guarantee on the protection and safety.
Description
Technical Field
The invention relates to a protective coating, in particular to a water-based protective coating with stripping property and a preparation method thereof, belonging to the field of coatings.
Background
In the current industries of construction machinery assembly, ship manufacturing, ocean transportation and the like, unplanned mechanical or chemical losses are usually generated due to long assembly period, long transportation period and the like. For example, in the transportation process of large mechanical parts, the paint on the originally coated parts is abraded due to accidental rubbing and the like, so that the base material is unprotected, the durability of the parts is affected, and the final product may have reduced durability. Therefore, the protective coating is applied to the intermediate links as the protection of the corrosion resistance and the mechanical property of the workpiece, and the strippable protective coating is gradually accepted due to the characteristics of convenient construction and convenient removal means when the protection is not needed.
The invention patent CN110105816A discloses a preparation method and application of a peelable temporary protective coating, which is mainly applied to temporary protection of furniture and walls during home decoration. The coating adopts inorganic salt as a main film forming substance, has narrow application range, does not have excellent weather resistance when facing a complex external environment, and cannot provide good protection effect.
The invention patent CN109517463A discloses an antifouling strippable coating composition and a preparation method thereof, wherein the coating prepared by the method has good stripping performance and excellent antibacterial performance, is mainly applied to the protection of aquaculture tanks in aquatic products, has a limited application range, is a solvent-based coating, has large VOC emission and causes more serious environmental pollution than a water-based coating.
The invention patent CN201510632171 discloses a quick tablecloth coating and a preparation method thereof, wherein the preparation method can provide a layer of peelable tablecloth coating for a tabletop. The coating disclosed by the invention is added with a large amount of stripping agents and fillers, so that the physical composition and the transparency degree of the cured coating are influenced, and the coating is not suitable for being coated on a substrate in a long-term complex environment or with a requirement on transmittance.
In the prior art, the types of protective coatings of parts in the process of assembling and transporting engineering machinery are less, the functions are single, and the discharge amount of VOC is higher. Therefore, the development of the environment-friendly water-based strippable protective coating which has a wider application range and is convenient to coat and remove has an application value.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a water-based protective coating product with release properties and a method for preparing the same.
Specifically, the invention is realized by the following technical scheme:
a water-based protective coating with stripping property comprises the following components in parts by weight:
40-80 parts of polyurethane emulsion, 0.5-2 parts of mildew preventive, 5-15 parts of film forming additive, 0.1-2 parts of rheological control agent and 0.1-3 parts of surface control additive.
Preferably, the water-based protective coating with stripping property also comprises 2-20 parts of water and 0.15-3 parts of water-based coating auxiliary agent.
Preferably, the water-based paint auxiliary agent is a leveling control agent and/or a substrate wetting agent
Preferably, the surface control agent is selected from any one or any plurality of wetting aids, flash rust resistance aids, ultraviolet absorbers or light stabilizers.
Preferably, the polyurethane emulsion is an aliphatic anionic acid-modified polyurethane dispersion.
More preferably, the aliphatic anionic acid-modified polyurethane dispersion is a Waterborne Polyurethane (WPU) organic substance, and the molecular structure of the aliphatic anionic acid-modified polyurethane dispersion contains a certain amount of anionic hydrophilic groups such as carboxyl or sulfonic acid, so that the polymer molecules are small, the viscosity of the emulsion is low, the nonvolatile content is generally between 30% and 40%, and the aliphatic anionic acid-modified polyurethane dispersion has good stability and dispersibility in water, and is particularly suitable for being used as a film forming substance of a coating of a waterborne system.
More preferably, the polyurethane emulsion is an aliphatic anionic acid polyurethane dispersion based on isophorone diisocyanate type. For the purposes of the present invention, the polyurethane emulsions may be chosen from the corresponding products of the aliphatic anionic polyurethane system from Bayer, Germany, or from the corresponding series from other companies. For example: bayer company Bayhydrol UH2648/1, Bayer company Bayhydrol UH2342, Germany Bayer company Bayhydrol UH2557, Tesmann DSM NeoRez R-600, Foshan City trade company PU-3461, Goodthirty liters.
Preferably, when the water-based protective coating with stripping property is applied to the case of only weather resistance protection without mechanical protection, the polyurethane emulsion is used in an amount of 40-50 parts; when the water-based protective coating with stripping property is applied to the situation that mechanical protection is needed, the dosage of the polyurethane emulsion is 70-80 parts.
Preferably, the main component of the aqueous mildew preventive is a thiazolinone organic compound.
More preferably, the aqueous mildewcide is selected from the group consisting of related brands of commercial products manufactured by federal, DOW, and the like. For example: a sterilizing preservative F-132 of the middle federal company, a spectrum sterilizing preservative F-58 of the middle federal company, a liquid mildew and algae preventing agent F-160 of the middle federal company, a Rohm and Hashton LXE bactericide of the Dow company and the like.
Preferably, the film-forming assistant is an alcohol ester film-forming assistant or an alcohol ether film-forming assistant, and the addition amount of the film-forming assistant is less than or equal to 10% of the weight of the resin.
More preferably, the coalescent is selected from the group consisting of Dow company or Istman Eastman company brand-related commercial products such as: propylene glycol methyl ether PM from Dow, dipropylene glycol methyl ether DPM from Dow, propylene glycol methyl ether acetate PMA from Dow, Texanol alcohol ester from Eastman, ethylene glycol monobutyl ether BCS from Dow, and the like.
Preferably, the rheology control agent is a modified urea solution and/or a hydrophobically modified oxy-polyurethane water-soluble polymer.
More preferably, the rheology control agent may be selected from all relevant brands of commercial products manufactured by Elementis corporation and BYK corporation, germany, for example: RHEOLATE FX1010 and RHEOLATE 299 of Elementis, BYK420 and BYK425 of BYK.
Preferably, the leveling control agents and substrate wetting agents may be selected from all relevant brands of commercial products manufactured by BYK and Evonik, germany, such as: BYK381, BYK380N, BYK 333, BYK 3560, BYK3565, TegoFlow 300, Tego Wet 270, Tego Wet 280, and Tego Flow 460.
Preferably, the wetting agent is selected from the relevant brands of commercial products manufactured by BYK company, germany and air chemical company, for example: BYK347, BYK346 from BYK, Germany, Dynol 607, Dynol 960 from air chemical, USA, Surfynol 104E, Surfynol 104 BC.
Preferably, the flash rust inhibitor may be selected from commercial products of the Halox corporation of the usa or other companies under relevant trade names, for example: Flash-X150 from Halox corporation, Raybo 60 from Raybo, Rebao Raybo, and FA179 from Hamming modest.
Preferably, the UV absorber may be selected from the relevant brands of commercial products from BASF corporation, such as: BASF TINUVIN 328 UV absorbent, BASF TINUVIN 1130 UV absorbent.
Preferably, the light stabilizer may be selected from the relevant brands of commercial products from BASF corporation, for example: BASFTINUVIN 5060 light stabilizer, BASF TINUVIN 292 light stabilizer, BASF CHIMASSORB 944 hindered amine light stabilizer, and the like.
The invention also provides a preparation method of the water-based protective coating with stripping property, which comprises the following steps:
step 1, uniformly stirring and mixing 40-80 parts of polyurethane emulsion and 5-15 parts of film-forming additive to obtain dispersion A;
step 2, under the condition that the stirring speed is kept unchanged, sequentially adding 0.15-3 parts of aqueous coating additive, 1-10 parts of water, 0.5-2 parts of mildew preventive, 0.1-3 parts of surface control additive and 1-10 parts of water into the dispersion liquid A, and stirring and mixing uniformly to obtain dispersion liquid B;
and 3, increasing the stirring speed, adding 0.1-2 parts of rheological control agent into the dispersion liquid B, and uniformly dispersing and mixing to obtain the water-based protective coating with stripping property.
Preferably, the stirring speed in step 2 is 400rpm to 1000rpm, the dispersing time is 10 minutes to 60 minutes, the stirring speed in step 3 is 700rpm to 1200rpm, and the dispersing time is 10 minutes to 60 minutes.
Preferably, the water, the mildewcide, the surface control agent and the rheology control agent are sequentially added in step 2 at intervals of 10 minutes to 20 minutes.
Preferably, when the number of the water-based paint auxiliary agents is greater than or equal to 2, the time interval between the addition of different auxiliary agents is 2 minutes to 5 minutes.
The invention also provides a using method of the water-based protective coating with stripping property, which comprises the following steps:
step 1, pretreating a base material;
and 2, coating the water-based protective coating with the stripping property on the pretreated base material, and naturally drying and curing or baking and curing at low temperature to obtain the base material coated with the water-based protective coating with the stripping property.
Preferably, the pretreatment of the substrate comprises dust removal and ester removal.
Preferably, when the substrate is a metal substrate, polishing treatment is not performed, and only degreasing operation is performed.
The thickness of the coating layer formed from the water-based protective coating material having releasability after curing is preferably 20 to 2000 μm, more preferably 40 to 80 μm.
Preferably, when the step 2 is selected to use natural drying, the curing time is 60 minutes to 600 minutes, and when the step 2 is selected to use low-temperature baking curing, the temperature is 35 ℃ to 60 ℃, preferably 40 ℃ to 50 ℃, and the heating curing time is 5 minutes to 60 minutes, preferably 20 minutes to 30 minutes.
The invention has the advantages that: the invention provides a water-based protective coating product with stripping property, and particularly relates to a water-based protective coating with a compact and high-toughness film, which is prepared by taking special polyurethane, a specific film-forming auxiliary agent and a coating auxiliary agent as raw materials. The coating has the advantages of high drying speed, no need of baking, strong toughness after film forming, easy tearing, aging resistance, mould resistance, excellent comprehensive performance and suitability for protection requirements under various conditions.
The invention has the characteristic that the interlayer adhesive force is smaller than the toughness of the paint film by utilizing the property that the interlayer crosslinking density of the special polyurethane is low but the self crosslinking density is high, thereby the paint film can be completely stripped. This release does not have any negative effect on the coating on the original material and does not damage the original coating when it is released.
One feature of the present invention is that the release agent and the filler are not added, and the resin performance is used to provide the release property, so that the residual components in the coating layer which do not belong to the chemical layer of the film forming of the coating film are greatly reduced, and the cured coating layer with more uniform and monotonous physical composition is provided, thereby improving the transmittance of the coating film, such as: light transmittance, wave transmittance, etc. This property allows the coating to be used on specific substrates where a certain transmittance is required.
The invention is characterized in that the paint is a transparent paint film after film forming. Under the condition of ensuring the excellent protective performance of the coating, the transparent characteristic of the coating can not influence the appearance characteristic of a workpiece, the identification degree is improved, and the operations such as identification, transfer and the like are convenient.
The invention has the characteristics that the coating can be coated on any substrate except the alkyd resin coating which is not completely dried, has good stripping performance and has a wide application range. Aiming at different base materials, coating construction can be carried out only by adjusting the coating on the auxiliary agent and the film-forming auxiliary agent according to the surface states of the base materials, such as surface energy, flatness, drying state and the like, and the controllability is strong.
When the water-based protective coating with the stripping property provided by the invention is coated on a base material to be protected according to a construction process, a varnish coating is formed after natural drying or low-temperature hot air baking drying, and the coating has certain weather resistance and stronger mechanical property, so that the state of the base material coating is effectively protected.
Specifically, the polyurethane emulsion used in the invention is a Waterborne Polyurethane (WPU) organic substance, and as the molecular structure of the polyurethane emulsion contains a certain amount of anionic hydrophilic groups such as carboxyl or sulfonic acid, the polymer molecule is small, the viscosity of the emulsion is low, the nonvolatile content is generally between 30% and 40%, and the polyurethane emulsion has good stability and dispersibility in water, and is particularly suitable for being used as a film forming substance of a coating of a waterborne system.
Further, the polyurethane emulsion used in the invention is based on an aliphatic anionic polyurethane dispersion of isophorone diisocyanate (IPDI) type, and has stronger aging resistance than some aromatic isocyanates such as Toluene Diisocyanate (TDI). Aromatic isocyanates such as Toluene Diisocyanate (TDI) and the like contain conjugated structures such as benzene rings and the like, and ultraviolet light can oxidize the aromatic isocyanates into quinone structures, so that the performances of the aromatic isocyanates are greatly influenced, adverse effects such as yellowing are generated, and the aromatic isocyanates are not suitable for long-term protection under outdoor conditions.
The invention adopts the water-based mildew preventive as the mildew preventive. When the workpiece is stored in a high-temperature and high-humidity environment for a long time, such as ocean freight transportation, mildew is easily grown on the surface of the workpiece, the coating of the workpiece does not have a mildew-proof effect, and once the mildew is generated, the surface layer of the coating is damaged, so that the workpiece is corroded and rusted, and the service performance of the workpiece is influenced. The water-based mildew inhibitor has broad-spectrum and balanced mildew and algae prevention activity, can effectively inhibit the growth of mildew, and ensures comprehensive protection of the protective coating in a special environment.
Furthermore, as the mildew preventive is a consumable mildew preventive, the specific addition amount of the mildew preventive is changed according to the period length required to be protected in the coating formula, so that a targeted mildew preventive effect is achieved.
The film-forming assistant used in the invention is an alcohol ester or alcohol ether film-forming assistant, and the addition amount is less than or equal to 10%, thus not only ensuring the integrity and continuity of the film, but also reducing the discharge amount of VOC and giving consideration to environmental protection and performance.
The flash rust resisting auxiliary agent is required to be added under special conditions, and is generally required to be added when the protective coating is directly contacted with a metal substrate of a workpiece. Because the coating is an aqueous system, when the coating is directly contacted with a metal substrate of a workpiece (generally, the substrate is polished, and the roughness is high), water in the coating is directly contacted with the substrate, and then an interface form of metal-water phase-gas phase is formed. The oxygen in the air and the water in the coating can form electrochemical action similar to that of a primary battery with the metal of the substrate, and the corrosion process of the metal substrate is accelerated very quickly. The anti-flash rust agent utilizes the reducing substance thereof to greatly delay the rust speed, and when the moisture is volatilized after drying, the electrochemical action disappears, and the flash rust can not be generated.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments. The following examples are merely illustrative of the present invention and are not to be construed as further limiting thereof.
The components and the formula of the water-based protective coating with stripping property prepared in comparative example 1 and examples 1-4 are shown in the following table 1.
TABLE 1 Components and formulation tables (in parts by weight)
The method for preparing the water-based protective coating with releasability of comparative example 1 and examples 1 to 4 was as follows:
step 1, uniformly stirring and mixing the polyurethane emulsion and the film-forming additive at a stirring speed of 700rpm to obtain a dispersion A;
step 2, under the condition that the stirring speed is kept unchanged, sequentially adding two water-based paint auxiliaries, deionized water with the preset amount of 50 wt%, a mildew preventive (if the deionized water is not added), a surface control auxiliary (if the deionized water is not added), and deionized water with the preset amount of 50 wt% into the dispersion liquid A, and stirring and mixing uniformly for 30 minutes after each addition of one component to obtain a dispersion liquid B;
and 3, increasing the stirring speed to 1000rpm, adding a rheological control agent into the dispersion liquid B, maintaining the rotation speed of 1000rpm, dispersing and uniformly mixing for 30 minutes to obtain the water-based protective coating with stripping property.
The time interval between the addition of the two water-based paint auxiliaries in the step 2 is 5 minutes.
In the step 2, the time interval for sequentially adding the water, the mildew preventive, the surface control agent and the rheology control agent is 15 minutes.
In example 4, the time interval between the addition of the different surface control adjuvants was 4 minutes.
Test example 1
The coatings prepared in examples 1-4 and comparative example 1 were applied to three different substrates: the substrate 1 is a polished steel plate; the substrate 2 is a polyurethane finish coating substrate; the substrate 3 is a fluororesin-coated substrate.
The coating method comprises the following steps:
step 1, pretreating a base material: removing dust and ester;
step 2, the coatings prepared in examples 1 to 4 and comparative example 1 were applied to the pretreated substrate, respectively.
The test results are shown below:
comparative example 1: flash rust occurred after about 4 minutes after coating on substrate 1; the state on the upper surface of the base material 2 is good; the surface of the base material 3 can not be wetted, and the phenomena of edge shrinkage and agglomeration are serious;
example 1: flash rust occurred after about 4 minutes after coating on substrate 1; the state on the upper surface of the base material 2 is good; the surface of the base material 3 can not be wetted, and the phenomena of edge shrinkage and agglomeration are serious;
example 2: flash rust occurred after about 4 minutes after coating on substrate 1; the state on the upper surface of the base material 2 is good; the surface is completely wetted on the base material 3, and the surface state is good;
example 3: the surface state on the base material 1 is good, and flash rust does not occur; the state on the upper surface of the base material 2 is good; the surface of the base material 3 can not be wetted, and the phenomena of edge shrinkage and agglomeration are serious;
example 4: the surface state on the base material 1 is good, and flash rust does not occur; the state on the upper surface of the base material 2 is good; the surface was completely wetted on the substrate 3, and the surface state was good.
The results above are shown briefly in table 2:
table 2 wettability test results for flash rust resistance
| Formulation of | Comparative example 1 | Example 1 | Example 2 | Example 3 | Example 4 |
| Good wettability | × | × | √ | × | √ |
| Flash rust resistance | × | × | × | √ | √ |
Test example 2
The polyurethane topcoat coating of substrate 2 coated with the coatings formulated according to the formulations of examples 1-4 and comparative example 1 was selected as the only test substrate and subjected to gloss, adhesion, impact, weathering, flame retardancy and mold resistance tests after curing at a low temperature of 45 ℃.
In this experiment, the drying conditions and the data of the dried paint film are shown in the following table:
| comparative example 1 | Example 1 | Example 2 | Example 3 | Example 4 | |
| Drying temperature | 45℃ | 45℃ | 45℃ | 45℃ | 45℃ |
| Drying time | 60min | 60min | 60min | 60min | 60min |
| Standing time | 48h | 48h | 48h | 48h | 48h |
| Dry film thickness | 62μm | 54μm | 58μm | 50μm | 55μm |
The tests described above are carried out in the following manner on the polyurethane topcoat coating of the substrate 2 after the applied strippable coating has been peeled off, except that the mould resistance test is carried out directly on the applied water-based protective coating with strippability.
The detection indexes of the film performance are as follows:
1. measurement index A- -gloss
The hardness of the coating film of the substrate from which the protective coating was peeled was measured by a special gloss meter in accordance with ASTM D523-89 specular gloss test method.
2. Detection index B- -adhesion (cross-cut method)
The base material coating film after the protective coating is torn off is maintained for 144 hours at 50 ℃ and then is tested according to the standard of an adhesion test of an ASTM D3359-08 cross-cut method.
3. Detection index C- -impact resistance
The base material coating film after the protective coating is torn off is tested according to the standard of a GBT 1732-1993 paint film impact resistance test method, the impact resistance performance of the base material coating film is investigated, and the quality of the adhesive force is reflected to a certain extent.
4. Detection index D- -weather resistance (QUV-A method)
The weather resistance of the base material coating film after the protective coating is torn off is tested according to the GB/T1865-.
5. Detection index E- -resistance to mold
The mold resistance of the cured protective coating is tested according to GB/T1741-2007 standard.
6. Measurement index F- -flame retardancy
The cured coating was peeled off completely, ignited with an open flame, and observed whether or not the flame continued due to the ignition.
The test results are shown in table 3.
Table 3 coating film test results
Claims (10)
1. The water-based protective coating with stripping property is characterized by comprising the following components in parts by weight:
40-80 parts of polyurethane emulsion, 0.5-2 parts of mildew preventive, 5-15 parts of film forming additive, 0.1-2 parts of rheological control agent and 0.1-3 parts of surface control additive.
2. The water-based protective coating with stripping property according to claim 1, characterized in that, it further comprises 2-20 parts of water and 0.15-3 parts of water-based coating auxiliary agent.
3. The water-based protective coating with stripping property of claim 2, wherein the water-based coating auxiliary agent is a leveling control agent and/or a substrate wetting agent.
4. The water-based protective coating with peeling property according to claim 2, characterized in that the surface control agent is selected from any one or more of a super wetting auxiliary, an anti-flash rust auxiliary, an ultraviolet absorber or a light stabilizer.
5. The water-based protective coating with release property according to claim 2, characterized in that the polyurethane emulsion is an aliphatic anionic acid-modified polyurethane dispersion.
6. The peelable aqueous protective coating according to claim 5 wherein the polyurethane emulsion is an aliphatic anionic acid polyurethane dispersion based on isophorone diisocyanate type.
7. The peelable waterborne protective coating of claim 2 wherein the rheology control agent is a modified urea solution and/or a hydrophobe modified ethoxylated urethane water soluble polymer.
8. The method for preparing the water-based protective coating with stripping property of any one of claims 2-7, characterized by comprising the following steps:
step 1, uniformly stirring and mixing 40-80 parts of polyurethane emulsion and 5-15 parts of film-forming additive to obtain dispersion A;
step 2, under the condition that the stirring speed is kept unchanged, sequentially adding 0.15-3 parts of aqueous coating additive, 1-10 parts of water, 0.5-2 parts of mildew preventive, 0.1-3 parts of surface control additive and 1-10 parts of water into the dispersion liquid A, and stirring and mixing uniformly to obtain dispersion liquid B;
and 3, increasing the stirring speed, adding 0.1-2 parts of rheological control agent into the dispersion liquid B, and uniformly dispersing and mixing to obtain the water-based protective coating with stripping property.
9. The method for preparing a water-based protective coating with stripping property according to claim 8, characterized in that the stirring speed in the step 2 is 400rpm-1000rpm, the dispersion time is 10 minutes-60 minutes, the stirring speed in the step 3 is 700rpm-1200rpm, and the dispersion time is 10 minutes-60 minutes.
10. The method for preparing a water-based protective coating with stripping property according to claim 8, wherein the time interval for sequentially adding deionized water, the mildew preventive, the surface control agent and the rheology control agent in the step 2 is 10 minutes to 20 minutes.
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