CN115368768B - 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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- CN115368768B CN115368768B CN202210498031.9A CN202210498031A CN115368768B CN 115368768 B CN115368768 B CN 115368768B CN 202210498031 A CN202210498031 A CN 202210498031A CN 115368768 B CN115368768 B CN 115368768B
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- 239000011253 protective coating Substances 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 22
- 239000000839 emulsion Substances 0.000 claims abstract description 63
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 22
- 239000011737 fluorine Substances 0.000 claims abstract description 22
- 239000013530 defoamer Substances 0.000 claims abstract description 9
- 239000002270 dispersing agent Substances 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920005749 polyurethane resin Polymers 0.000 claims abstract description 8
- 229920001971 elastomer Polymers 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 239000003112 inhibitor Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000012948 isocyanate Substances 0.000 claims abstract description 4
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 4
- 229920001194 natural rubber Polymers 0.000 claims abstract description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 4
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 claims abstract description 4
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 239000003995 emulsifying agent Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 7
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 claims description 4
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 4
- YJKHMSPWWGBKTN-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)F YJKHMSPWWGBKTN-UHFFFAOYSA-N 0.000 claims description 3
- 229920003015 aliphatic polyurethane dispersion Polymers 0.000 claims description 2
- 230000000379 polymerizing effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 claims 2
- 229920002635 polyurethane Polymers 0.000 abstract description 2
- 239000004814 polyurethane Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 239000000758 substrate Substances 0.000 description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 8
- 239000005995 Aluminium silicate Substances 0.000 description 7
- 235000012211 aluminium silicate Nutrition 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000003999 initiator Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000004945 emulsification Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012745 toughening agent Substances 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- WPKYZIPODULRBM-UHFFFAOYSA-N azane;prop-2-enoic acid Chemical group N.OC(=O)C=C WPKYZIPODULRBM-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 150000002513 isocyanates Chemical group 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000005521 carbonamide group Chemical group 0.000 description 1
- 150000003857 carboxamides Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006264 polyurethane film Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Paints Or Removers (AREA)
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 aqueous polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluoronatural rubber powder, 15-30 parts of filler, 0.3-1 part of defoamer, 1-2 parts of dispersant, 0.3-0.5 part of flash rust inhibitor, 0.1-1 part of flexibilizer, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water; the component B is isocyanate curing agent. The water-based environment-friendly strippable protective coating prepared by the invention can be embedded into emulsion when being mixed in a 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, so that the prepared protective coating has better adaptability.
Description
Technical Field
The invention relates to a water-based environment-friendly strippable protective coating (IPC class number: C09D), in particular to a water-based environment-friendly strippable protective coating and a preparation method thereof.
Background
In order to improve the construction and installation efficiency, more and more people adopt the mode of field assembly of prefabricated parts, namely workpieces are produced in factories and transported to the field for assembly, the prefabricated parts/finished products are transported to the field for a long distance after being taken off line from the factories, and the whole transportation process needs to be protected, so that the strippable paint with the protection effect is generated. The strippable paint is a special protective paint, is coated on the surface of a substrate to isolate external corrosion, avoids the influence of rust, scratch, aging, pollution, dust, greasy dirt, 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 surfaces of the substrates after the protection is finished, and does not negatively influence the surfaces of the substrates.
Chinese patent No. CN107828322B provides an aqueous releasable coating prepared by film forming materials, pigments, fillers, thickeners, release agents, wetting agents, dispersants, leveling agents, defoamers and water as disclosed in the published patent. Because the film forming material is a mixture of polyurethane film forming material and polyvinyl alcohol film forming material, the film surface is not smooth easily in the specific experimental process, and the phenomenon of bubbles exists, particularly when the film forming material is used on the surface of a base material such as steel, the flash rust phenomenon easily occurs in the early stage, so that the strippable coating loses the anti-corrosion effect, 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 an aqueous environment-friendly strippable 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 aqueous polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluoronatural rubber powder, 15-30 parts of filler, 0.3-1 part of defoamer, 1-2 parts of dispersant, 0.3-0.5 part of flash rust inhibitor, 0.1-1 part of flexibilizer, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water;
the component B is isocyanate curing agent;
the mass ratio of the component A to the component B is (7-9): 1, a step of;
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 strippable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is (3-4): 1.
as a preferable 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) And (3) polymerizing the emulsion prepared in the steps 1) and 2) to obtain the polymer.
As a preferred scheme, the preparation raw materials of the nuclear pre-emulsion A comprise water, styrene and an emulsifier.
As a preferable scheme, the shell pre-emulsion B is prepared from water, butyl acrylate, acrylic acid, N-methylol 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 a core pre-emulsion A: weighing a certain amount of water, styrene and a mixed emulsifier (the mass mixing ratio of OP-10 to SDS is 1:3), and placing the mixture in 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-methylolacrylamide, modifier (dodecafluoroheptyl methacrylate, GO 4) and the rest of mixed emulsifier, and placing into a flask for pre-emulsification.
3) Polymerization reaction: firstly, adding 1/3 core pre-emulsion A into a four-neck flask, heating to a reaction temperature, adding 4mL of initiator (ammonium persulfate), dripping the residual emulsion A after blue light is generated 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, the emulsion B is dripped within 130min, and the initiator is dripped every 15 min; heating to 85 ℃ for curing for 30min, cooling to below 50 ℃, adopting ammonia water to adjust the pH value to 7-8, removing slag, and obtaining the fluorine modified styrene-acrylic emulsion.
As a preferred embodiment, the aqueous polyurethane resin is an aqueous aliphatic polyurethane dispersion.
Further preferably, the aqueous polyurethane resin is HT3630.
As a preferable scheme, the mass content of fluorine in the fluoronatural rubber is 5-8%.
As a preferable embodiment, the particle size of the fluoronatural rubber is 0.5-1. Mu.m.
As a preferred embodiment, the defoamer is a silicone defoamer, commercially available, such as Michaelson SAG638.
As a preferable scheme, the filler is one or more of kaolin, barium sulfate, talcum powder, water-washed kaolin, heavy 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): (14-16).
As a preferred embodiment, the dispersant is an ammonium acrylate dispersant, commercially available, such as the Dow chemical OROTAN1124.
As a preferable scheme, the toughening agent is a low-molecular amide substance; further preferably, the toughening agent is a carboxamide.
The flash rust inhibitor of the present invention is not particularly limited as long as it can achieve its flash rust inhibiting effect.
The second aspect of the invention provides a preparation method of an aqueous environment-friendly strippable protective coating, which comprises the following steps:
1) And (3) preparation of the component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) Mixing the component B and the component A according to the mass ratio.
The beneficial effects are 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 anti-corrosion effect, particularly has better adhesive force when being used on the surface of steel, and avoids phenomena such as flashing and the like in the early stage; in addition, the water-based environment-friendly strippable protective coating prepared by the invention can be embedded into emulsion when being mixed in a 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, so that the prepared protective coating has better adaptability and better adhesive force, better ageing resistance and tensile strength are provided for the protective coating, and the protective effect of the protective coating when the protective coating is used on the surfaces of various substrates is ensured.
Detailed Description
Examples
Example 1
The embodiment 1 of the invention provides an aqueous environment-friendly strippable 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 aqueous polyurethane resin, 25 parts of aqueous dispersion emulsion, 2 parts of fluorine natural rubber powder, 18 parts of filler, 0.5 part of defoamer, 1.5 parts of dispersant, 0.4 part of flash rust inhibitor, 0.6 part of flexibilizer, 6 parts of aluminum tripolyphosphate and 26 parts of water;
the component B is isocyanate curing agent;
the mass ratio of the component A to the component B is 8:1, a step of;
the strippable 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 defoamer and 0.4 part of pH regulator.
The aqueous dispersion emulsion comprises a strippable acrylic emulsion and a fluorine modified styrene-acrylic emulsion, wherein the mass ratio of the strippable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is 3.5:1, a step of;
among them, acrylic emulsion type Carboset PL3127 can be peeled off.
The fluorine modified styrene-acrylic emulsion is self-made, and the preparation method comprises the following steps:
1) Preparation of a core pre-emulsion A: weighing water, styrene and a mixed emulsifier (OP-10: SDS, wherein the mass mixing ratio is 1:3) with the mass ratio of 30:40:30, and placing the mixture in 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 the following components in percentage by mass: 45:15:5:20 water, butyl acrylate, acrylic acid, N-methylolacrylamide, modifier (dodecafluoroheptyl methacrylate, GO 4) and the remaining mixed emulsifier were placed in a flask for pre-emulsification.
3) Polymerization reaction: firstly, adding 1/3 core pre-emulsion A into a four-neck flask, heating to 65 ℃, adding 4mL of initiator (ammonium persulfate), dripping the residual emulsion A after blue light is generated 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, the emulsion B is dripped within 130min, and the initiator is dripped every 15 min; heating to 85 ℃ for curing for 30min, cooling to below 50 ℃, adopting ammonia water to adjust the pH value to 7-8, removing slag, and obtaining the fluorine modified styrene-acrylic emulsion.
The aqueous polyurethane resin is purchased from Hefei Hengtian New Material science and technology Co.
The fluoronatural rubber powder has the brandPPA 2626；
The filler is a mixture of water-washed kaolin and heavy calcium carbonate; the weight ratio of the water-washed kaolin to the heavy calcium carbonate is 18:15.
the defoamer is a silicone defoamer, purchased from michaux SAG638.
The dispersant is an ammonium acrylate dispersant available from the dow chemical ortan 1124.
The toughening agent is carbonamide.
The second aspect of the invention provides a preparation method of an aqueous environment-friendly strippable protective coating, which comprises the following steps:
1) And (3) preparation of the component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) Mixing the component B and the component A according to the mass ratio.
Example 2
The specific implementation mode of the water-based environment-friendly strippable protective coating is the same as that of example 1, and 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 coating is the same as that of the example 1, and the mass ratio of the strippable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is 3:1.
comparative example 1
An aqueous environment-friendly strippable protective coating, the specific embodiment of which is the same as that of example 1, except that the fluorine-containing modified styrene-acrylic emulsion in comparative example 1 is not used.
Comparative example 2
An aqueous environmental-friendly strippable protective coating, the specific embodiment of which is the same as that of example 1, except that in comparative example 2, fluoronatural rubber powder is not present.
Performance test:
the basic properties of the aqueous environmental-friendly strippable protective coating obtained in example 1 are recorded in table 1.
After the aqueous environment-friendly strippable protective coating obtained in the example 1 was coated on the surfaces of different protective substrates, the protective coating was left to dry and solidify by itself, and then a protective top coating was coated, and the stripping grades on the different substrates were detected, and the stripping grade descriptions and the divisions are shown in table 2.
TABLE 2
Performance test results:
table 1 shows the basic performance test results of the aqueous environmental-friendly strippable protective coating obtained in example 1.
TABLE 1
Table 3 shows the peel level test results of examples 1-3 and comparative examples 1-2 to obtain coatings applied to different substrate surfaces as shown in Table 3.
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 that: the protective coating needs to have proper stripping force and adhesive force, and meanwhile, the protective coating has the best performance when the stripping grade is 1 grade (complete and easy stripping, no damage to a paint film and no residue on a substrate).
Claims (5)
1. The water-based environment-friendly strippable 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 aqueous polyurethane resin, 13-26 parts of aqueous dispersion emulsion, 1-3 parts of fluoronatural rubber powder, 15-30 parts of filler, 0.3-1 part of defoamer, 1-2 parts of dispersant, 0.3-0.5 part of flash rust inhibitor, 0.1-1 part of flexibilizer, 5-8 parts of aluminum tripolyphosphate and 20-30 parts of water;
the component B is isocyanate curing agent;
the mass ratio of the component A to the component B is (7-9): 1, a step of;
the aqueous dispersion emulsion at least comprises a strippable acrylic emulsion and a fluorine modified styrene-acrylic emulsion;
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) to obtain the emulsion;
the preparation raw materials of the nuclear pre-emulsion A comprise water, styrene and an emulsifying agent;
the preparation raw materials of the shell pre-emulsion B comprise water, butyl acrylate, acrylic acid, N-methylolacrylamide, dodecafluoroheptyl methacrylate and an emulsifier;
the brand BL PPA 2626 of the fluorine natural rubber powder.
2. The aqueous environment-friendly strippable protective coating according to claim 1, wherein the weight ratio of the strippable acrylic emulsion to the fluorine modified styrene-acrylic emulsion is (3-4): 1.
3. the aqueous environmental protection peelable protective coating according to claim 1 or 2, wherein the peelable acrylic emulsion is at least one selected from Carboset PL3127 and Carboset PL-958.
4. The aqueous environmental protection strippable protective coating of claim 1, wherein the aqueous polyurethane resin is an aqueous aliphatic polyurethane dispersion.
5. A method of preparing an aqueous environmentally friendly strippable protective coating according to any one of claims 1 to 4, comprising the steps of:
1) And (3) preparation of the component A: mixing the preparation raw materials according to the weight requirement, and reacting to obtain the product;
2) Mixing the component B and the component A according to the mass ratio.
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