CN116731551A - Environment-friendly paint remover for aviation use and preparation method and application thereof - Google Patents
Environment-friendly paint remover for aviation use and preparation method and application thereof Download PDFInfo
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- CN116731551A CN116731551A CN202310776167.6A CN202310776167A CN116731551A CN 116731551 A CN116731551 A CN 116731551A CN 202310776167 A CN202310776167 A CN 202310776167A CN 116731551 A CN116731551 A CN 116731551A
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- 239000003973 paint Substances 0.000 title claims abstract description 173
- 238000002360 preparation method Methods 0.000 title abstract description 14
- OIKFIOGYFGWPAB-UHFFFAOYSA-N 1-(3-methoxypropyl)pyrrolidin-2-one Chemical compound COCCCN1CCCC1=O OIKFIOGYFGWPAB-UHFFFAOYSA-N 0.000 claims abstract description 33
- FVSUYFWWFUVGRG-UHFFFAOYSA-N naphthalen-1-ylurea Chemical compound C1=CC=C2C(NC(=O)N)=CC=CC2=C1 FVSUYFWWFUVGRG-UHFFFAOYSA-N 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000008367 deionised water Substances 0.000 claims abstract description 24
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 230000000149 penetrating effect Effects 0.000 claims abstract description 13
- 239000004115 Sodium Silicate Substances 0.000 claims description 32
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 32
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 32
- -1 methylphenoxy Chemical group 0.000 claims description 30
- KCIDZIIHRGYJAE-YGFYJFDDSA-L dipotassium;[(2r,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate Chemical class [K+].[K+].OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@H]1O KCIDZIIHRGYJAE-YGFYJFDDSA-L 0.000 claims description 28
- 238000003756 stirring Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims 2
- 230000007797 corrosion Effects 0.000 abstract description 43
- 238000005260 corrosion Methods 0.000 abstract description 43
- 230000000694 effects Effects 0.000 abstract description 25
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 230000005764 inhibitory process Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 12
- 239000000758 substrate Substances 0.000 abstract description 7
- 239000004814 polyurethane Substances 0.000 abstract description 5
- 229920002635 polyurethane Polymers 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 239000004593 Epoxy Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 21
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 13
- 239000001257 hydrogen Substances 0.000 description 13
- 229910052739 hydrogen Inorganic materials 0.000 description 13
- 229910000861 Mg alloy Inorganic materials 0.000 description 11
- 239000004615 ingredient Substances 0.000 description 10
- 229910000975 Carbon steel Inorganic materials 0.000 description 9
- 239000010962 carbon steel Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 238000009472 formulation Methods 0.000 description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 6
- 239000004480 active ingredient Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 230000002195 synergetic effect Effects 0.000 description 6
- 239000003112 inhibitor Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- OXILGXRAFYNZTD-UHFFFAOYSA-N naphthalene urea Chemical compound NC(=O)N.NC(=O)N.C1=CC=CC2=CC=CC=C12 OXILGXRAFYNZTD-UHFFFAOYSA-N 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- BNXZHVUCNYMNOS-UHFFFAOYSA-N 1-butylpyrrolidin-2-one Chemical compound CCCCN1CCCC1=O BNXZHVUCNYMNOS-UHFFFAOYSA-N 0.000 description 2
- WVDDGKGOMKODPV-UHFFFAOYSA-N Benzyl alcohol Chemical class OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 description 2
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Substances OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 125000001476 phosphono group Chemical group [H]OP(*)(=O)O[H] 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 231100000957 no side effect Toxicity 0.000 description 1
- 239000002357 osmotic agent Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000009736 wetting Methods 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
- C09D9/00—Chemical paint or ink removers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the field of paint removers, in particular to an environment-friendly paint remover for aviation and a preparation method and application thereof. The aviation environment-friendly paint remover comprises the following components in percentage by mass: 30-50% of N-methoxypropyl-2-pyrrolidone; 2-5% of penetrating agent; 0.5-1% of 1-naphthyl urea; 1-3% of a promoter; 41-66.5% of deionized water. The paint remover does not contain harmful substances, is friendly to the environment, achieves good paint removing effects on epoxy primer and polyurethane finish paint outside an aircraft, is high in paint removing speed, has good corrosion inhibition on various metal substrates, and accords with the specifications of the Boeing company material standard BSS7432 and the American aviation material standard SAE AMS1377 paint remover.
Description
Technical Field
The invention relates to the technical field of paint removers, in particular to an environment-friendly paint remover for aviation and a preparation method and application thereof.
Background
The aircraft coating needs to be changed every 6 years, old paint is removed by a chemical method, and a methylene dichloride paint remover and a hydrogen peroxide/benzyl alcohol series paint remover are widely used at present, and the paint remover has certain defects: the paint remover containing methylene dichloride has relatively high pollution to the environment and cannot be used for paint removal of composite materials; the hydrogen peroxide/benzyl alcohol series components have relatively high corrosiveness to the magnesium alloy, and are not suitable for paint removal on the surface of the magnesium alloy.
All aviation paint remover airworthiness standards have technical requirements of hydrogen embrittlement corrosion tests and magnesium alloy corrosion tests, but the components of many aviation paint removers in the prior art have the problem of easily causing hydrogen embrittlement corrosion and magnesium alloy corrosion of cadmium-plated high-strength carbon steel, and some aviation paint removers adopt disodium ethylenediamine tetraacetate, formic acid, glycolic acid, hydrogen peroxide and the like which are materials easy to cause hydrogen embrittlement corrosion and magnesium alloy corrosion. Therefore, the problems of hydrogen embrittlement corrosion and magnesium alloy corrosion of the cadmium-plated high-strength carbon steel easily caused by the existing paint remover for aviation still remain to be solved.
Accordingly, there is a need for improvement and development in the art.
Disclosure of Invention
In view of the defects of the prior art, the invention provides an aviation environment-friendly paint remover, and a preparation method and application thereof, and aims to solve the problems that the existing aviation paint remover is easy to cause hydrogen embrittlement corrosion and magnesium alloy corrosion and has poor environment-friendly performance.
In order to solve the technical problems, the invention provides the environment-friendly paint remover for aviation, which is used for carrying out paint removal treatment on the surface coating of the aircraft, has no corrosion problem on aluminum alloy, titanium alloy, carbon steel and magnesium alloy of the aircraft, and can be used for paint removal on the surface of a composite material. Meanwhile, the paint remover formula components provided by the invention do not contain harmful substances, are mild and friendly to the environment, have good paint removing effects on epoxy primer and polyurethane finish paint outside an aircraft, accord with the specifications of the material standard BSS7432 of Boeing company and the SAE AMS1377 paint remover of American aviation material standard, have no side effect on external metal materials and nonmetallic materials of the aircraft, and therefore, meet the requirements required by China civil aviation agency and accord with the specifications of SAE AMS1377 on the aircraft paint remover.
Specifically, the technical scheme of the invention is as follows:
the invention aims to provide an environment-friendly paint remover for aviation, which comprises the following components in percentage by mass: 30-50% of N-methoxypropyl-2-pyrrolidone; 2-5% of penetrating agent; 0.5-1% of 1-naphthyl urea; 1-3% of a promoter; 41-66.5% of deionized water.
Alternatively, the osmotic agent is an α -phosphono- ω - (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt.
Optionally, the accelerator is sodium silicate.
Optionally, the aviation environment-friendly paint remover comprises the following components in percentage by mass: 50% of N-methoxypropyl-2-pyrrolidone; 5% of an alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt; 1-naphthylurea 1%; 3% of sodium silicate; 41% of deionized water.
Optionally, the deionized water has a resistivity <10us/cm.
The invention also aims at providing a preparation method of the environment-friendly paint remover for aviation, which comprises the following steps:
adding N-methoxypropyl-2-pyrrolidone, 1-naphthylurea, a penetrating agent, an accelerator and deionized water into a container according to mass proportions;
stirring, standing and filtering to obtain the paint remover.
Optionally, in the preparation method of the aviation environment-friendly paint remover, the penetrating agent is alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene-diyl) dipotassium salt.
Optionally, in the preparation method of the aviation environment-friendly paint remover, the accelerator is sodium silicate.
Optionally, in the preparation method of the aviation environment-friendly paint remover, the stirring conditions are as follows: the temperature is 25-40 ℃, the time is 1-2 hours, and the stirring speed is 120 revolutions per minute.
The invention also provides a method for paint removal treatment of the surface of the aircraft, which comprises the following steps: and (3) coating the environment-friendly paint remover for aviation on the surface of the aircraft skin, scraping the wrinkled coating, flushing and entering the next process.
The invention has the following beneficial effects:
the environment-friendly paint remover for aviation provided by the invention has no corrosion problem of aluminum alloy, titanium alloy, carbon steel and magnesium alloy of an aircraft, and can be used for paint removal of the surface of a composite material. The paint remover does not contain harmful substances, is friendly to the environment, achieves good paint removing effects on epoxy primer and polyurethane finish paint outside an aircraft, is high in paint removing speed, has good corrosion inhibition on various metal substrates, effectively solves the problem of hydrogen embrittlement corrosion of the paint remover on cadmium-plated high-strength carbon steel, and accords with the specifications of the material standard BSS7432 of Boeing company and the SAE AMS1377 paint remover of American aviation material standard.
Detailed Description
The invention provides an aviation environment-friendly paint remover, a preparation method and application thereof, and aims to make the purposes, technical schemes and effects of the invention clearer and more definite, and the invention is further described in detail below. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides an aviation environment-friendly paint remover, which comprises the following components in percentage by mass: 30-50% of N-methoxypropyl-2-pyrrolidone; 2-5% of penetrating agent; 0.5-1% of 1-naphthyl urea; 1-3% of a promoter; 41-66.5% of deionized water.
Wherein, the formula of the paint remover adopts N-methoxypropyl-2-pyrrolidone as a main solvent, and the molecular formula is as follows:the molecular weight is small, the volatility is low, and the permeability is strong. When the N-methoxypropyl-2-pyrrolidone is coated on the surface of a coating film, the N-methoxypropyl-2-pyrrolidone can soften and swell the coating, damage the space structure of the coating film and the combination of the coating film and a substrate, and make N-methoxypropyl-2-pyrrolidone molecules pass through the coating filmThe tiny holes of the film penetrate into the molecular chains of the polymer of the paint film, the molecular volume of the polymer is increased, internal stress is generated, the binding force between the paint film and the substrate is destroyed, the paint film is wrinkled, bubbling is generated, and the paint film is separated from the substrate. Compared with the common N-R-2-pyrrolidone (R represents various carbon chain alkyl groups) serving as a main solvent, the N-methoxypropyl-2-pyrrolidone adopted in the embodiment of the invention has one more methoxy group, has better wetting permeability to a base material, has better swelling capacity to epoxy groups in coating paint, has a good stripping effect to a paint film coating of an aircraft skin, and can achieve higher paint stripping efficiency in the same time.
Meanwhile, 1-naphthyl urea is adopted as a metal corrosion inhibitor in the formula of the paint remover, and the molecular formula is as follows:because the naphthalene urea contains positively charged amine ions, the naphthalene urea can be adsorbed to the cathode region of a micro battery on the metal surface, and hydrophobic naphthalene groups in the molecular structure are oriented outwards, other corrosion mediums can be prevented from approaching to the cathode surface and discharging to cause corrosion to be difficult to occur, so that the naphthalene urea can be an effective metal corrosion inhibitor in paint remover components, particularly an effective corrosion inhibitor of magnesium alloy, and an effective corrosion inhibitor for preventing hydrogen embrittlement corrosion of carbon steel. Meanwhile, the 1-naphthyl urea also has affinity to the base metal, can promote the paint remover to permeate into a coating film, accelerate the paint removing speed and shorten the paint removing time, and can also play the role of an accelerator. Furthermore, 1-naphtyl urea can have a synergistic effect with N-methoxypropyl-2-pyrrolidone.
The lower limit value of each component in the mass percent range of each component in the formula is the result of an orthogonal test, which can ensure the minimum requirements of paint stripping effect and navigability, and the paint stripping effect achieved by the paint stripper begins to be constant when the upper limit value of the range is exceeded. The mass percentage range of each component in the embodiment of the invention ensures that the paint remover has good paint removing efficiency and metal corrosion inhibition effect, and simultaneously saves the cost.
In some embodiments, the penetrating agent is used in the formulation of the paint stripperIs an alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt having the formula:the alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene glycol) dipotassium salt can promote the paint remover to permeate into the substrate, and plays a role in accelerating the stripping of a coating film. Furthermore, in addition to wet permeation, the phosphono group of the α -phosphono- ω - (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt is capable of producing a metal complex precipitate on the metal surface, forming a barrier film, thereby protecting the metal from corrosive liquids. There is also some synergy between the phosphono and 1-naphthylurea of the α -phosphono- ω - (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt.
In some embodiments, the promoter is sodium silicate, and the sodium silicate can play a role in regulating the PH, so that the aqueous solution of the paint remover is regulated to be in an alkaline environment, and the breaking of polyurethane macromolecules is facilitated, the effect of accelerating stripping of a coating film is achieved, and the paint removing time can be shortened. Meanwhile, the sodium silicate and 1-naphthyl urea and alpha-phosphono-omega- (methylphenoxy) -poly (oxo-1, 2-ethylene-diyl) dipotassium salt have synergistic effect.
In some embodiments, the aviation environment-friendly paint remover comprises the following components in percentage by mass: 50% of N-methoxypropyl-2-pyrrolidone; 5% of an alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt; 1-naphthylurea 1%; 3% of sodium silicate; 41% of deionized water.
The components of the environment-friendly paint remover for aviation use, namely N-methoxypropyl-2-pyrrolidone, 1-naphthylurea, alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene glycol) and sodium silicate, have synergistic effect.
In some embodiments, the deionized water has a resistivity <10us/cm.
The embodiment of the invention provides a preparation method of an environment-friendly paint remover for aviation, which comprises the following steps:
adding N-methoxypropyl-2-pyrrolidone, 1-naphthylurea, a penetrating agent, an accelerator and deionized water into a container according to mass proportions;
stirring, standing and filtering to obtain the paint remover.
In some embodiments, the penetrating agent is alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt, and the promoter is sodium silicate.
In some embodiments, in the preparation method of the aviation environment-friendly paint remover, the stirring conditions are as follows: the temperature is 25-40 ℃, the time is 1-2 hours, and the stirring speed is 120 revolutions per minute.
Specifically, the preparation method comprises the following steps: and (3) preparing materials according to the mass ratio of each component in the paint remover formula, adding deionized water into a reaction kettle, adding sodium silicate, starting a stirring kettle, setting the temperature between 25 ℃ and 40 ℃, stirring at a speed of 120 r/min, sequentially adding other components according to the mass ratio in the formula after the sodium silicate is completely dissolved, stirring for 1-2 hours, stopping stirring after the components are completely dissolved, standing, filtering, and filling to obtain the paint remover.
The embodiment of the invention also provides an application of the environment-friendly paint remover for aviation, and paint removal treatment is carried out on the surface of an aircraft, wherein the paint removal treatment method specifically comprises the following steps: after the aircraft skin surface is coated with the aviation environment-friendly paint remover and the coating wrinkling drum skin is finished, a coating film is scraped, then the aircraft skin surface is washed by water and naturally dried, and the aircraft skin surface can enter the next process.
The following is a further description of the present invention with reference to specific examples.
Example 1
Preparation of paint remover
(1) Preparing the components of the paint remover in the table 1 and the proportion thereof, adding deionized water into a reaction kettle, adding sodium silicate, starting a stirring kettle, setting the temperature between 28 ℃ and the stirring speed of 120 r/min;
(2) After the sodium silicate is completely dissolved, sequentially adding other components, and stirring for 1.5 hours;
(3) After the components are completely dissolved, stopping stirring, standing, filtering and filling to obtain the paint remover.
TABLE 1
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 30％ |
| Alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt | 2％ |
| 1-naphthylurea | 0.5％ |
| Sodium silicate | 1％ |
| Deionized water | 66.5％ |
Example 2
This embodiment differs from embodiment 1 only in that: the ingredients and proportions of the paint stripper in Table 2 were formulated.
TABLE 2
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 40％ |
| Alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt | 3％ |
| 1-naphthylurea | 0.7％ |
| Sodium silicate | 2％ |
| Deionized water | 54.3％ |
Example 3
This embodiment differs from embodiment 1 only in that: the ingredients and proportions of the paint stripper in Table 3 were formulated.
TABLE 3 Table 3
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 50％ |
| Alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt | 5％ |
| 1-naphthylurea | 1％ |
| Sodium silicate | 3％ |
| Deionized water | 41％ |
Comparative example 1
The only difference from example 1 is that: the ingredients of the paint stripper and their proportions in table 4 were formulated and no step involving no ingredients was involved.
TABLE 4 Table 4
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 33.5％ |
| Deionized water | 66.5％ |
Comparative example 2
The only difference from example 1 is that: the ingredients of the paint stripper and their proportions in table 5 were formulated and no step involving no ingredients was involved.
TABLE 5
Comparative example 3
The only difference from example 1 is that: the ingredients of the paint stripper and their proportions in table 6 were formulated and no step involving no ingredients was involved.
TABLE 6
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 30％ |
| 1-naphthylurea | 3.5％ |
| Deionized water | 66.5％ |
Comparative example 4
The only difference from example 1 is that: the ingredients of the paint stripper and their proportions in table 7 were formulated and no steps involving no ingredients were involved.
TABLE 7
| Paint remover component | Mass percent |
| N-methoxypropyl-2-pyrrolidone | 30％ |
| Sodium silicate | 3.5％ |
| Deionized water | 66.5％ |
Comparative example 5
The only difference from example 1 is that: the paint stripper components and the proportions thereof in Table 8 were compounded.
TABLE 8
| Paint remover component | Mass percent |
| N-butyl-2-pyrrolidone | 30％ |
| Alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt | 2％ |
| 1-naphthylurea | 0.5％ |
| Sodium silicate | 1％ |
| Deionized water | 66.5％ |
Paint removal effect test
(1) Paint removal efficiency
The paint removers prepared in examples 1-3 and comparative examples 1-5 were applied to aluminum alloy panels coated with standard primers and topcoats, respectively, and after 4 hours, the paint removal areas were counted to be not less than 90% acceptable, the method was in accordance with American society for aviation paint remover standard SAE AMS1377, the test results of examples 1-3 are shown in Table 9, the paint remover formulations of comparative examples 1-5 and the corresponding test results are shown in Table 10, wherein the relevant data of example 1 are shown in Table 10 for comparison.
Table 9 SAE AMS1377 item detection results
As can be seen from the test results of examples 1-3 in Table 9, the present invention was formulated: 30-50% of N-methoxypropyl-2-pyrrolidone; 2-5% of penetrating agent; 0.5-1% of 1-naphthyl urea; 1-3% of a promoter; 41-66.5% of deionized water, and the paint stripping efficiency and metal corrosion performance of the paint stripping agent accord with American society for aviation paint stripping agent standard SAE AMS 1377. And the paint remover prepared in the embodiment 3 has optimal paint removing efficiency, wherein the paint remover comprises the following components in percentage by mass: 50% of N-methoxypropyl-2-pyrrolidone; 5% of an alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt; 1-naphthylurea 1%; 3% of sodium silicate; 41% of deionized water.
Table 10
As can be seen from the data of example 1 and comparative examples 1-5 in Table 10, the total active ingredient of the paint stripper was 33.5%. The paint removal effect and the corresponding analysis are as follows:
in comparative example 1, the effective component in the paint remover formula is only N-methoxypropyl-2-pyrrolidone, the mass percentage is 33.5%, and the paint removing efficiency is only 30.1%.
In comparative example 2, the paint stripper formulation comprises the following active ingredients: 30% of N-methoxypropyl-2-pyrrolidone, 3.5% of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt, and the paint stripping efficiency of the paint stripping composition is 55.2%, and the alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt has the effect of promoting paint stripping.
In comparative example 3, the paint stripper formulation comprises the following active ingredients: 30% of N-methoxypropyl-2-pyrrolidone and 3.5% of 1-naphthyl urea, the paint stripping efficiency is 75.3%, and the 1-naphthyl urea has obvious effect of promoting paint stripping.
In comparative example 4, the paint stripper formulation comprises the following active ingredients: 30% of N-methoxypropyl-2-pyrrolidone and 3.5% of sodium silicate, wherein the paint stripping efficiency is 47.2%, and the sodium silicate has a promoting effect on the paint stripping effect of the paint stripping agent.
In example 1, the paint stripper formulation contains the following active ingredients: 30% of N-methoxypropyl-2-pyrrolidone, 2% of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt (%) and 0.5% of 1-naphthylurea, 1% of sodium silicate, the paint stripping efficiency is 92.8%, the paint stripping effect is synergistic when the paint stripping effect is achieved in a formula by adding 3.5% of single-component alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt, 1-naphthylurea and sodium silicate according to the mass fraction of SAE AMS1377, and the paint stripping effect is better when the paint stripping effect is achieved in a formula by the three components of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt (%) 2%, 1-naphthylurea and sodium silicate according to the comparative example 2 and comparative example 3.
In comparative example 5, the main solvent is N-butyl-2-pyrrolidone instead of N-methoxypropyl-2-pyrrolidone in example 1, the paint stripping efficiency is reduced from 92.8% to 78.3%, and the paint stripping efficiency cannot meet the SAE AMS1377 standard requirement, i.e. the paint stripping efficiency reaches more than 90% in 4 hours, and it can be seen that the embodiment of the invention uses N-methoxypropyl-2-pyrrolidone as the main solvent, wherein the presence of methoxy significantly increases the paint stripping rate of the paint stripper.
(2) Corrosion inhibition of metals
The paint removers prepared in example 1 and comparative examples 1 to 4 were applied to various metal panels, respectively, according to the American society for aviation paint remover standard SAE AMS1377, and the test results of the corrosion inhibition are shown in Table 11.
TABLE 11
As can be seen from the data in Table 11, the total active ingredient of the paint stripper in example 1 and comparative examples 1 to 4 was 33.5%, and the corrosion inhibition and the corresponding analysis were as follows:
in comparative example 1, the paint remover formula only contains a main solvent, no component capable of playing a role in corrosion inhibition is added, and the corrosion results of magnesium alloy, aluminum alloy, carbon steel and hydrogen embrittlement are all disqualified, which shows that the N-methoxypropyl-2-pyrrolidone solvent has no corrosion inhibition effect.
In comparative example 2, 3.5% of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt is added in the paint remover formula, so that the corrosiveness of the paint remover is reduced, and other test items except for test items of hydrogen embrittlement corrosion accord with the navigable standard SAE AMS1377, so that the alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt has a certain metal corrosion inhibition effect.
In comparative example 3, 3.5% of 1-naphthyl urea is added in the paint remover formula, so that the corrosiveness of the paint remover is reduced, and the 1-naphthyl urea plays a remarkable metal corrosion inhibition role and effectively solves the problem of hydrogen embrittlement corrosion of carbon steel through a navigation standard SAE AMS 1377.
In comparative example 4, 3.5% sodium silicate is added to the paint stripper formulation to reduce the corrosiveness of the paint stripper, but the hydrogen embrittlement corrosion does not conform to the seaworthiness standard SAE AMS1377, indicating that sodium silicate plays a certain role in metal corrosion inhibition.
In the embodiment 1,2 percent of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene-diyl) dipotassium salt, 0.5 percent of 1-naphthylurea and 1 percent of sodium silicate are simultaneously added in the paint remover formula, the total amount of the components with corrosion inhibition effect is 3.5 percent, but the metal corrosiveness of the paint remover is greatly reduced, the paint remover meets the SAE AMS1377 standard, the corrosion inhibition effect is obviously better than the effect of independently adding each component, and the synergistic metal corrosion inhibition effect is shown among the three components, namely alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene-diyl) dipotassium salt, 1-naphthylurea and sodium silicate.
The experimental results show that in the paint remover formula provided by the embodiment of the invention, 1-naphthyl urea is a special corrosion inhibitor for solving the problem of hydrogen embrittlement corrosion, and the compounding of alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethylene-diyl) dipotassium salt, 1-naphthyl urea and sodium silicate can achieve the synergistic effect of metal protection.
In summary, the environment-friendly paint remover for aviation use provided by the invention does not contain harmful substances, is mild and friendly to the environment, has good paint removing effect on epoxy primer and polyurethane finish paint outside an aircraft, is high in paint removing speed, has good corrosion inhibition on various metal substrates, effectively solves the problem of hydrogen embrittlement corrosion of the paint remover on cadmium-plated high-strength carbon steel, and accords with the specifications of the material standard BSS7432 of Boeing company and the American aviation material standard SAE 1377 paint remover.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (10)
1. The environment-friendly paint remover for aviation is characterized by comprising the following components in percentage by mass: 30-50% of N-methoxypropyl-2-pyrrolidone; 2-5% of penetrating agent; 0.5-1% of 1-naphthyl urea; 1-3% of a promoter; 41-66.5% of deionized water.
2. The environmental protection paint stripper for aviation use according to claim 1, wherein the penetrating agent is α -phosphono- ω - (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt.
3. The environmental protection paint stripper for aviation use according to claim 1, wherein the accelerator is sodium silicate.
4. The aviation environment-friendly paint remover according to claim 1, wherein the paint remover comprises, in mass percent: 50% of N-methoxypropyl-2-pyrrolidone; 5% of an alpha-phosphono-omega- (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt; 1-naphthylurea 1%; 3% of sodium silicate; 41% of deionized water.
5. The environmentally friendly paint stripper for aviation use according to claim 1, wherein the deionized water has a resistivity of <10us/cm.
6. A method for preparing the environment-friendly paint remover for aviation use as claimed in claim 1, comprising the steps of:
adding N-methoxypropyl-2-pyrrolidone, 1-naphthylurea, a penetrating agent, an accelerator and deionized water into a container according to mass proportions;
stirring, standing and filtering to obtain the paint remover.
7. The method for preparing an environmentally friendly paint stripper for aviation use according to claim 6, wherein the penetrating agent is α -phosphono- ω - (methylphenoxy) -poly (oxy-1, 2-ethanediyl) dipotassium salt.
8. The method for preparing an environmentally friendly paint stripper for aviation use according to claim 6, wherein the accelerator is sodium silicate.
9. The method for preparing the environment-friendly paint remover for aviation use according to claim 6, wherein the stirring conditions are as follows: the temperature is 25-40 ℃, the time is 1-2 hours, and the stirring speed is 120 revolutions per minute.
10. A method for paint removal treatment of an aircraft surface, comprising the steps of: an aircraft skin surface is coated with the environment-friendly paint remover for aviation use according to any one of claims 1 to 5, wrinkled coating is scraped off, and the aircraft skin surface is washed.
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