CN115851055A - Water-based strippable coating and preparation method thereof - Google Patents
Water-based strippable coating and preparation method thereof Download PDFInfo
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- CN115851055A CN115851055A CN202211613090.2A CN202211613090A CN115851055A CN 115851055 A CN115851055 A CN 115851055A CN 202211613090 A CN202211613090 A CN 202211613090A CN 115851055 A CN115851055 A CN 115851055A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000000576 coating method Methods 0.000 title claims abstract description 56
- 239000011248 coating agent Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 54
- 239000008367 deionised water Substances 0.000 claims abstract description 15
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 12
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 10
- 239000003899 bactericide agent Substances 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 63
- 238000003756 stirring Methods 0.000 claims description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 23
- 239000004814 polyurethane Substances 0.000 claims description 15
- 229920002635 polyurethane Polymers 0.000 claims description 15
- 238000004821 distillation Methods 0.000 claims description 14
- 239000003973 paint Substances 0.000 claims description 13
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 13
- 239000004925 Acrylic resin Substances 0.000 claims description 12
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 12
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Polymers C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- 229920000178 Acrylic resin Polymers 0.000 claims description 9
- 239000003054 catalyst Substances 0.000 claims description 9
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 8
- 229920000570 polyether Polymers 0.000 claims description 8
- -1 polysiloxane Polymers 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical group CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 claims description 7
- 229910019142 PO4 Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 7
- 239000010452 phosphate Substances 0.000 claims description 7
- 239000000839 emulsion Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 125000005233 alkylalcohol group Chemical group 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 229940100555 2-methyl-4-isothiazolin-3-one Drugs 0.000 claims description 3
- 125000000217 alkyl group Chemical group 0.000 claims description 3
- BEGLCMHJXHIJLR-UHFFFAOYSA-N methylisothiazolinone Chemical compound CN1SC=CC1=O BEGLCMHJXHIJLR-UHFFFAOYSA-N 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- DMSMPAJRVJJAGA-UHFFFAOYSA-N benzo[d]isothiazol-3-one Chemical compound C1=CC=C2C(=O)NSC2=C1 DMSMPAJRVJJAGA-UHFFFAOYSA-N 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 238000006386 neutralization reaction Methods 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 3
- 230000000996 additive effect Effects 0.000 claims 2
- 239000003139 biocide Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 239000008199 coating composition Substances 0.000 abstract description 2
- 125000000524 functional group Chemical group 0.000 abstract description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 9
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000013556 antirust agent Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 230000032050 esterification Effects 0.000 description 3
- 238000005886 esterification reaction Methods 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 229940098779 methanesulfonic acid Drugs 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 239000002519 antifouling agent Substances 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- GLDOVTGHNKAZLK-UHFFFAOYSA-N octadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCCCO GLDOVTGHNKAZLK-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical group OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- BTFJIXJJCSYFAL-UHFFFAOYSA-N arachidyl alcohol Natural products CCCCCCCCCCCCCCCCCCCCO BTFJIXJJCSYFAL-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013530 defoamer Substances 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
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- MGIYRDNGCNKGJU-UHFFFAOYSA-N isothiazolinone Chemical compound O=C1C=CSN1 MGIYRDNGCNKGJU-UHFFFAOYSA-N 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
Abstract
The invention provides a water-based strippable coating and a preparation method thereof, and the water-based strippable coating comprises film-forming resin, a thixotropic agent, a leveling agent, a bactericide, a defoaming agent, deionized water and a functional stripping agent; the functional stripping agent is obtained through the design of a molecular structure and a functional group, has good compatibility with a water-based strippable coating formula system, gives consideration to the balance of the adhesiveness and the strippability of a coating, has an antirust effect, and is particularly suitable for temporary protection of a metal surface.
Description
Technical Field
The invention belongs to the field of packaging decoration, and particularly relates to a water-based strippable coating and a preparation method thereof.
Background
During the transportation and storage of steel, parts and instruments, the surfaces of the steel, the parts and the instruments are easily corroded and scratched by acid rain, water vapor, oil stain, microorganisms and the like, so that the surfaces of the steel, the parts and the instruments are damaged to different degrees, and the service life of the steel, the parts and the instruments is shortened. The strippable protective paint can be used as a temporary protective paint to well prevent the equipment from being damaged. After use, the adhesive tape can be completely peeled from the surfaces of steel, parts and equipment, and the subsequent normal use of the adhesive tape is not influenced. The strippable coating can be smeared by methods such as spraying, brushing and the like, can be applied to workpieces with complex structures, and has the characteristic of convenient construction. At present, the domestic market mainly comprises two types of solvent-based strippable coatings and water-based strippable coatings. The aromatic hydrocarbon-containing solvent-based strippable coating has better performance, but gradually fades out of the market because the aromatic hydrocarbon-containing solvent-based strippable coating does not meet the environmental protection requirement. The water-based strippable coating meets the requirement of environmental protection and is popular in more and more market applications.
The strippable coating needs to meet the requirements of both adhesiveness and strippability of a substrate, and the two have certain contradiction. Most of film-forming resins in the formula of the water-based strippable paint are water-based polyurethane, water-based acrylate, water-based polyurethane modified acrylate, polyvinyl alcohol and the like, and the film-forming resins have good viscosity to various substrates, so that an auxiliary agent (stripping agent) for assisting stripping is often required to be added in the formula. The strippers are classified into three types, inorganic, organic and high polymer. The inorganic stripping agent is calcium carbonate, talcum powder, pottery clay, etc.; the organic stripping agent is stearic acid and its salt, fatty acid ester, glycerol, etc.; the high polymer type stripping agent is silicone oil, polyethylene glycol, low molecular weight polyethylene, etc. The above substances are all in the balance of system compatibility and stripping effect. For example, calcium carbonate-based powders have a problem that they are poor in dispersibility in a system and that when the dispersibility in a system is improved by a technical means, a peeling effect is generally exhibited. The compatibility of fatty acid and its salts, fatty acid esters, silicone oil, low molecular weight polyethylene and water-based strippable coatings is also problematic, and glycerol and polyethylene glycol have good water solubility but general stripping effect. It can be seen that for water-based strippable coatings, it is desirable to provide a stripper that has good compatibility and good stripping effect.
In addition, the water-based strippable coating has a problem of rusting when applied to the surface of a metal object due to a long drying time (2 to 3 hours). The antirust agent is added into the formula, and molecules of the antirust agent are locked by a network structure of the film-forming resin, so that the antirust agent is difficult to react with the surface of metal in time, and a satisfactory antirust effect cannot be obtained. Patent CN107216756A discloses a quick-drying strippable paint containing alkaline alcohol-soluble silica sol, the formula of which comprises alcohol-soluble self-crosslinking acrylate resin and alkaline alcohol-soluble silica sol, namely, the drying time is shortened to 30 min by the quick volatilization of alcohol, thereby improving the problem of rusting on the metal surface. Although the technology can improve the drying time of the strippable coating, the technology is obviously not as environment-friendly as the water-based strippable coating due to the use of a volatile alcohol solvent. Patent CN103360931A discloses a water-based strippable coating for temporary protection of metals, the formulation of which comprises water-based polyurethane, styrene-acrylic emulsion and inorganic filler with micro-flaky structure. The hydroxyl on the surface of the inorganic filler can effectively lock water, so that the filler can improve the corrosion resistance of the coating.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a water-based strippable coating, which is a functional stripping agent obtained by designing a molecular structure and a functional group, has good compatibility with a water-based strippable coating formula system, gives consideration to the balance of the adhesion and the strippability of a coating, has an antirust effect, and is particularly suitable for temporary protection of a metal surface.
Yet another object of the present invention is to: provides a preparation method of the water-based strippable coating.
The purpose of the invention is realized by the following scheme: the water-based strippable coating with balanced adhesiveness and strippability and an antirust function comprises film-forming resin, a thixotropic agent, a leveling agent, a bactericide, an antifoaming agent, deionized water and a functional stripper containing the following general formula:
wherein R is 1 Is C 16 -C 20 Alkyl groups of (a); r 2 Is 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol group; m is an integer of 5 to 15; n is an integer of 5 to 12.
The functional stripping agent accounts for 1.0-4.0% of the water-based strippable coating by mass.
The film-forming resin is a mixture of polyurethane modified acrylic resin and silica sol, and the mass percentage of the film-forming resin in the water-based strippable coating is 51.0-78.0%.
In the mixture of the polyurethane-forming modified acrylic resin and the silica sol, the mass ratio of the polyurethane-forming modified acrylic resin to the silica sol is 3.5-1.5.
The thixotropic agent is polyurethane associative thickening emulsion, and the mass percentage of the thixotropic agent in the water-based strippable coating is 3.0-7.0%.
The leveling agent is polyether modified polysiloxane, and the mass percent of the leveling agent in the water-based strippable coating is 0.4-1.0%.
The bactericide is one or a mixture of two of styrene-acrylic isothiazolinone and methylisothiazolinone, and the mass percentage of the bactericide in the water-based strippable coating is 0.5-2.0%.
The defoaming agent is a polyether modified organic silicon defoaming agent, and the mass percentage of the defoaming agent in the water-based strippable coating is 0.1-0.3%.
The deionized water accounts for 11.7-40.0% of the water-based strippable coating by mass.
The preparation method of the water-based strippable coating comprises the following steps:
(1) Preparation of functional Release agent
A1000 mL four-neck flask with a stirrer and a thermometer is taken as a reaction flask to be placed on an oil bath pan, and equimolar alkyl alcohol polyoxyethylene ether phosphate monoester and 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol polyoxyethylene ether, a water-carrying agent accounting for 30-40 wt% of reaction components and a catalyst accounting for 0.1% of the total substances are slowly added. And the upper end of the water separator is connected with a condensation pipe. Starting stirring, heating the materials in the reaction flask to 90-110 ℃ for reaction. And judging the reaction end point according to the quality of the moisture separated in the reaction process. The reaction was stopped when the mass of moisture collected in the trap was greater than 96% of the theoretical amount. And (3) taking down the water separator, replacing a horizontal condenser pipe, wherein one end of the horizontal condenser pipe is connected with the reaction flask, and the other end of the horizontal condenser pipe is connected with a three-neck flask with the volume of 500 mL as a collecting bottle of the water-carrying agent. 500 One port of the mL-volume three-port flask is connected with a vacuum pump, and the other port is sealed. Keeping the temperature of the materials in the reaction flask at 90-110 ℃, and starting reduced pressure distillation for 30-45 min. And raising the temperature of the materials in the reaction flask to 125-135 ℃, and continuing vacuum distillation for 30-45 min to remove the water-carrying agent in the materials. After the reduced pressure distillation is finished, cooling the materials in the reaction flask to 50-60 ℃, adding a certain amount of 30 wt% NaOH aqueous solution (wherein, the mole number of NaOH is the sum of the mole numbers of the catalyst and the alkyl alcohol polyoxyethylene ether phosphate monoester) for neutralizing the catalyst and the reaction products. And adding deionized water with the same mass as the salt generated by the neutralization reaction, and stirring for 15-20 min. And after stirring is stopped, naturally cooling to room temperature, and collecting a product in the reaction flask, namely the functional stripping agent.
(2) Preparation of aqueous strippable coatings
And adding the polyurethane modified acrylic resin and the silica sol into deionized water, uniformly stirring, sequentially adding a thixotropic agent, a functional stripping agent, a flatting agent, a bactericide and a defoaming agent in a stirring state, and uniformly stirring to obtain the water-based strippable coating.
Compared with the prior art, the water-based strippable coating has the following advantages when used for temporarily protecting the metal surface:
on one hand, the formula of the water-based strippable coating adopts polyurethane modified acrylic resin and silica sol as main film forming substances, has good film forming property and adhesiveness, can be quickly crosslinked into a film at room temperature in the construction process, and is adhered to the surface of metal;
on the other hand, the functional stripping agent has high surface activity, can reduce the surface tension of a system more quickly compared with a commercial surfactant, and can be quickly transferred to a construction surface in the coating construction process. Furthermore, phosphorus atoms of phosphoric acid groups in the functional stripping agent and metal atoms are adsorbed, long-chain alkyl in a molecular structure is positioned between the metal surface and the coating to play a role in isolation, and the balance between the adhesion and the strippability of the coating is obtained by accurately adjusting the proportion of the film-forming substance and the functional stripping agent. In addition, the isolating layer formed on the metal surface can block the corrosion of moisture and has good antirust performance, so that the isolating layer also has an inhibiting effect on the corrosion of the metal surface.
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments. The scope of protection of the invention is not limited to the following examples, which are set forth for illustrative purposes only and are not intended to limit the invention in any way.
Example 1
The preparation of the aqueous strippable coating of this example included the following steps:
(1) Preparation of functional Release agent
A1000 mL four-neck flask with a volume of stirring and thermometer is taken as a reaction flask and placed on an oil bath pot, and equimolar cetyl polyoxyethylene ether phosphate monoester (R) is slowly added 1 =C 16 N = 5) 180.67 g and 2,4,7,9-tetramethyl-5-decyne-4, 7-diol polyoxyethylene ether (m = 5) 148.80 g, water-carrying agent toluene 98.84 g, catalyst methanesulfonic acid 0.43 g; the upper end of the water separator is connected with a condensation pipe. Starting stirring, heating the materials in the reaction flask to 90-110 ℃ for reaction. The reaction end point is judged by the quality of the separated water in the reaction process. When the mass of the water collected in the water separator is 5.18 g, the reaction is stopped, and the esterification conversion rate is 96 percent; and (3) taking off the water separator, replacing with a horizontal condenser pipe, wherein one end of the horizontal condenser pipe is connected with the reaction flask, and the other end of the horizontal condenser pipe is connected with a three-neck flask with the volume of 500 mL and used as a collecting bottle of the water-carrying agent. 500 One port of the mL-volume three-port flask is connected with a vacuum pump, and the other port is sealed. Keeping the temperature of the materials in the reaction flask at 90 ℃, starting reduced pressure distillation for 45 min, then increasing the temperature of the materials in the reaction flask to 125 ℃, and continuing reduced pressure distillation for 45 min to remove the water-carrying agent in the materials. After the distillation under reduced pressure was completed, the contents of the reaction flask were cooled to 50 ℃ and 40.59 g of a 30 wt% aqueous NaOH solution was added. Adding 297.68 g of deionized water, and stirring for 20 min; after the stirring was stopped, the reaction flask was naturally cooled to room temperature, and the product in the reaction flask was collected. The product is thatIs a functional stripping agent and is marked as BL-1;
(2) Preparation of aqueous strippable coatings
Adding 35.0 parts of polyurethane modified acrylic resin and 16.0 parts of silica sol into 40 parts of deionized water, uniformly stirring, sequentially adding 7.0 parts of polyurethane associated thickening emulsion, 1.0 part of functional stripping agent BL-1, 0.4 part of polyether modified polysiloxane flatting agent, 0.5 part of benzisothiazolinone bactericide and 0.1 part of polyether modified organic silicon defoaming agent under a stirring state, and uniformly stirring to obtain the water-based strippable coating.
Example 2
The preparation of the aqueous strippable coating of this example included the following steps:
(1) Preparation of functional Release agent
A1000 mL four-neck flask with a stirring and thermometer capacity is taken as a reaction flask and placed on an oil bath kettle, and equimolar eicosanol polyoxyethylene ether phosphate monoester (R) is slowly added 1 =C 20 N = 12) 181.20 g and 2,4,7,9-tetramethyl-5-decyne-4, 7-diol polyoxyethylene ether (m = 15) 177.28 g, water-carrying agent toluene 107.54 g, catalyst methanesulfonic acid 0.47 g. The upper end of the water separator is connected with a condensation pipe. Starting stirring, heating the materials in the reaction flask to 110 ℃ for reaction. The reaction end point is judged by the quality of the separated water in the reaction process. The reaction was stopped when the mass of water collected in the trap was 3.46 g, at which point the esterification conversion was 96%. And (3) taking off the water separator, replacing with a horizontal condenser pipe, wherein one end of the horizontal condenser pipe is connected with the reaction flask, and the other end of the horizontal condenser pipe is connected with a three-neck flask with the volume of 500 mL and used as a collecting bottle of the water-carrying agent. 500 One port of the mL-volume three-port flask is connected with a vacuum pump, and the other port is sealed. Keeping the temperature of the materials in the reaction flask at 110 ℃, starting reduced pressure distillation for 30 min, then increasing the temperature of the materials in the reaction flask to 135 ℃, and continuing reduced pressure distillation for 30 min to remove the water-carrying agent in the materials. After the distillation under reduced pressure was completed, the contents of the reaction flask were cooled to 60 ℃ and 27.31 g of a 30 wt% aqueous NaOH solution was added. 337.19 g of deionized water was added thereto, and the mixture was stirred for 15 min. After the stirring was stopped, the reaction flask was naturally cooled to room temperature, and the product in the reaction flask was collected. The product is the functional stripping agent and is marked as BL-2.
(2) Preparation of aqueous strippable coatings
Adding 45.0 parts of polyurethane modified acrylic resin and 20.0 parts of silica sol into 25.2 parts of deionized water, stirring uniformly, sequentially adding 5.0 parts of polyurethane associated thickened emulsion, 2.6 parts of functional stripping agent BL-2, 0.7 part of polyether modified polysiloxane flatting agent, 1.3 parts of methylisothiazolinone and 0.2 part of polyether modified organic silicon defoamer under a stirring state, and stirring uniformly to obtain the water-based strippable coating.
Example 3
The preparation of the aqueous strippable coating of this example included the following steps:
(1) Preparation of functional Release agent
A1000 mL four-neck flask with a stirrer and a thermometer and a capacity of 1000 mL is taken as a reaction flask and placed on an oil bath pan, and an equimolar amount of octadecanol polyoxyethylene ether phosphate monoester (R) is slowly added 1 =C 18 N = 8) 234.00 g and 2,4,7,9-tetramethyl-5-decyne-4, 7-diol polyoxyethylene ether (m = 10) 222.13 g, water-carrying agent toluene 136.84 g, catalyst methanesulfonic acid 0.59 g. The upper end of the water separator is connected with a condensation pipe. Starting stirring, heating the materials in the reaction flask to 90-110 ℃ for reaction. The reaction end point is judged by the quality of the separated water in the reaction process. The reaction was stopped when the mass of water collected in the trap was 5.18 g, at which point the esterification conversion was 96%. And (3) taking down the water separator, replacing a horizontal condenser pipe, wherein one end of the horizontal condenser pipe is connected with the reaction flask, and the other end of the horizontal condenser pipe is connected with a three-neck flask with the volume of 500 mL as a collecting bottle of the water-carrying agent. 500 One port of the mL-volume three-port flask is connected with a vacuum pump, and the other port is sealed. Keeping the temperature of the materials in the reaction flask at 100 ℃, starting reduced pressure distillation for 40 min, raising the temperature of the materials in the reaction flask to 130 ℃, and continuing reduced pressure distillation for 40 min to remove the water-carrying agent in the materials. After the distillation under reduced pressure was completed, the contents of the reaction flask were cooled to 55 ℃ and 40.82 g of a 30 wt% aqueous NaOH solution was added. 424.25 g deionized water was added and stirred for 20 min. Stopping stirring, naturally cooling to room temperature, and collecting a product in the reaction flask; the product is the functional stripping agent and is marked as BL-3.
(2) Preparation of aqueous strippable coatings
Adding 55.0 parts of polyurethane modified acrylic resin and 23.0 parts of silica sol into 11.7 parts of deionized water, uniformly stirring, sequentially adding 3.0 parts of polyurethane associated thickened emulsion, 4.0 parts of functional stripping agent BL-3, 1.0 part of flatting agent, 2.0 parts of bactericide and 0.3 part of defoaming agent under a stirring state, and uniformly stirring to obtain the water-based strippable coating.
It should be noted by those skilled in the art that the described embodiments of the present invention are merely exemplary and that various other substitutions, alterations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the above-described embodiments, but is only limited by the claims.
Claims (10)
1. An aqueous strippable coating material suitable for temporary protection of metal surfaces comprising a film-forming resin and an additive dispersed in deionized water, wherein the additive comprises a functional stripper having the formula:
in the formula R 1 Is C 16 -C 20 Alkyl groups of (a); r 2 Is 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol group; m is an integer of 5 to 15; n is an integer of 5 to 12.
2. The water-based peelable coating according to claim 1, wherein the mass percentage of the functional release agent in the water-based peelable coating is between 1.0 and 4.0%.
3. The water-based strippable paint as claimed in claim 1, wherein the film-forming resin is a mixture of polyurethane-modified acrylic resin and silica sol, the mass percentage of the film-forming resin in the water-based strippable paint is 51.0-78.0%, and the mass ratio of the polyurethane-modified acrylic resin to the silica sol is 3.5-1.5.
4. The aqueous strippable paint of claim 1 wherein the additives further comprise thixotropic agents, leveling agents, biocides and defoamers.
5. The aqueous strippable paint of claim 4, wherein the thixotropic agent is a polyurethane-based associative thickened emulsion, and the mass percentage of the thixotropic agent in the aqueous strippable paint is 3.0-7.0%.
6. The water-based strippable paint as claimed in claim 4, wherein the leveling agent is polyether modified polysiloxane, and the mass percentage of the leveling agent in the water-based strippable paint is 0.4-1.0%.
7. The water-based strippable paint as claimed in claim 4, wherein the bactericide is one or a mixture of two of benzisothiazolinone or methylisothiazolinone, and the mass percentage of the bactericide in the water-based strippable paint is between 0.5 and 2.0 percent.
8. The water-based strippable paint as claimed in claim 4, wherein the defoaming agent is polyether modified organic silicon defoaming agent, and the mass percentage of the defoaming agent in the water-based strippable paint is 0.1-0.3%.
9. The water-based peelable coating according to claim 1, wherein the deionized water is present in the water-based peelable coating in an amount of 11.7 to 40.0% by mass.
10. A method for preparing the aqueous peelable coating according to any one of claims 1-9, comprising the steps of:
(1) Preparation of functional Release agent
Taking a 1000 mL-volume four-neck flask with a stirring and thermometer as a reaction flask, placing the reaction flask on an oil bath pan, slowly adding equimolar alkyl alcohol polyoxyethylene ether phosphate monoester, 2,4,7, 9-tetramethyl-5-decyne-4, 7-diol polyoxyethylene ether, a water-carrying agent accounting for 30-40 wt% of reaction components and a catalyst accounting for 0.1% of total substances; connecting a water separator, connecting a condensing pipe at the upper end of the water separator, starting stirring, heating the materials in the reaction flask to 90-110 ℃ for heating reaction, and judging the reaction endpoint according to the quality of the separated water in the reaction process; stopping the reaction when the mass of the water collected in the water separator is more than 96% of the theoretical amount, taking down the water separator, and replacing with a horizontal condenser pipe, wherein one end of the horizontal condenser pipe is connected with the reaction flask, and the other end of the horizontal condenser pipe is connected with a three-neck flask with the volume of 500 mL and used as a collecting bottle of the water-carrying agent; 500 One port of the mL-volume three-port flask is connected with a vacuum pump, and the other port is sealed; keeping the temperature of the materials in the reaction flask at 90-110 ℃, and starting reduced pressure distillation for 30-45 min; then the temperature of the materials in the reaction flask is raised to 125-135 ℃, and the reduced pressure distillation is continued for 30-45 min to remove the water-carrying agent in the materials; after the reduced pressure distillation is finished, cooling the materials in the reaction flask to 50-60 ℃, adding a 30 wt% NaOH aqueous solution, wherein the mol number of NaOH is the sum of the mol numbers of the catalyst and the alkyl alcohol polyoxyethylene ether phosphate monoester, and the NaOH is used for neutralizing the catalyst and the reaction product; adding deionized water with the same mass as the salt generated by the neutralization reaction, stirring for 15-20 min, stopping stirring, naturally cooling to room temperature, and collecting the product in the reaction flask, namely the functional stripping agent;
(2) Preparation of aqueous strippable coatings
And adding the polyurethane modified acrylic resin and the silica sol into deionized water, uniformly stirring, sequentially adding a thixotropic agent, a functional stripping agent, a flatting agent, a bactericide and a defoaming agent in a stirring state, and uniformly stirring to obtain the water-based strippable coating.
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| US20050176605A1 (en) * | 1999-05-04 | 2005-08-11 | Lassila Kevin R. | Acetylenic diol ethylene oxide/propylene oxide adducts and processes for their manufacture |
| CN101652435A (en) * | 2007-02-08 | 2010-02-17 | 威士伯采购公司 | Peel-coat compositions |
| CN105153831A (en) * | 2015-10-30 | 2015-12-16 | 哈尔滨工业大学 | Organosilane doped waterborne strippable coating and preparation method thereof |
| CN106967357A (en) * | 2016-01-13 | 2017-07-21 | 海洋化工研究院有限公司 | Environment-friendly type aqueous Stripable paint and preparation |
| CN109161243A (en) * | 2018-08-24 | 2019-01-08 | 广东鑫皇冠新材料有限公司 | A kind of strippable water-based paint and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050176605A1 (en) * | 1999-05-04 | 2005-08-11 | Lassila Kevin R. | Acetylenic diol ethylene oxide/propylene oxide adducts and processes for their manufacture |
| CN101652435A (en) * | 2007-02-08 | 2010-02-17 | 威士伯采购公司 | Peel-coat compositions |
| CN105153831A (en) * | 2015-10-30 | 2015-12-16 | 哈尔滨工业大学 | Organosilane doped waterborne strippable coating and preparation method thereof |
| CN106967357A (en) * | 2016-01-13 | 2017-07-21 | 海洋化工研究院有限公司 | Environment-friendly type aqueous Stripable paint and preparation |
| CN109161243A (en) * | 2018-08-24 | 2019-01-08 | 广东鑫皇冠新材料有限公司 | A kind of strippable water-based paint and preparation method thereof |
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