CN107641370B - Preparation method of paint remover - Google Patents
Preparation method of paint remover Download PDFInfo
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- CN107641370B CN107641370B CN201711155331.2A CN201711155331A CN107641370B CN 107641370 B CN107641370 B CN 107641370B CN 201711155331 A CN201711155331 A CN 201711155331A CN 107641370 B CN107641370 B CN 107641370B
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Abstract
The invention discloses a preparation method of a paint remover, which comprises the following steps in parts by weight: s1, mixing DBE mixed dibasic acid ester, propylene glycol methyl ether and paraffin, and heating and dissolving until the mixture is transparent and has no blocky object, so as to obtain a paraffin molten mixture; s2, adding the solvent oil and the dimethyl carbonate into a reaction cylinder, and heating while stirring; s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing until the mixture is uniformly mixed; s4, adding methanol and dichloromethane, keeping the temperature, dispersing uniformly, adding formic acid microcapsules and an emulsifier, and continuing to disperse; s5, adding a thickening agent and an aversion agent, keeping the temperature and dispersing the mixture evenly, and filtering the mixture to obtain the paint remover. The paint remover prepared by adopting the technical scheme has the following advantages: 1. the formic acid is microencapsulated doubly, so that the formic acid is prevented from corroding the iron tank, and the hidden danger of corrosion and perforation is eliminated; 2. and the propellant capable of quickly vaporizing and absorbing heat is preferably selected, the surface temperature of the coating is reduced, and the volatilization rate, the loss rate and the like of the product are slowed down by the cooperation of the propellant, the paraffin and the thickening agent.
Description
Technical Field
The invention relates to a coating or paint film removing technology, in particular to a preparation method of a paint remover which has stable quality and low volatilization rate, can slow down the loss of the paint remover for vertical surfaces and inclined surfaces, efficiently removes paint and has easily cleaned residues.
Background
The paint is coated on the surface of an object to form a coating film, and has the special functions of protection, decoration, marking and the like. Along with the economic development and the improvement of scientific technology in China, the coating can provide more and more perfect and more powerful functions on more layers. However, the coating is damaged in the using process, the coating is aged, or the coating needs to be removed and recoated for the reason of pursuing aesthetics and functions individually.
There are a variety of methods for removing the old coating, including physical and chemical methods. The physical methods include mechanical means for removing the coating on the surface of the substrate, pure color coating, laser treatment, flame ablation, high pressure water gun flushing, and the like. In contrast, chemical methods are more commonly used. The chemical method is to utilize paint remover to penetrate, dissolve or react paint film so as to remove the paint from coating or surface. Paint strippers can be classified into alkaline strippers, acidic strippers and solvent-based strippers according to their composition. At present, the solvent-type paint remover is the most common one, mainly comprises chlorinated alkanes, benzyl alcohols, methyl pyrrolidone, esters and the like, and the paint film or coating is quickly separated from a matrix by utilizing the covering, permeating and dissolving actions of a solvent. Solvent-based paint removers generally consist of a main solvent, a cosolvent, an activator, a volatilization inhibitor and other auxiliaries.
The chlorinated hydrocarbon paint remover prepared by taking dichloromethane and paraffin as main components is commonly called a water flush type paint remover, is mainly used for removing acrylic paint, nitrolacquer, alkyd paint, polyurethane, partial epoxy paint and low-temperature curing two-component paint, and has the characteristic of high paint removing efficiency. However, for some epoxy paints and automobile baking paints, the paint removing effect of the chlorinated hydrocarbon paint remover is poor, and particularly for the paint removing of vertical and inclined paint films, the paint remover has high loss rate and poorer paint removing efficiency.
In order to improve the paint removing efficiency, on one hand, some electrophilic solvents, namely activating agents (such as formic acid) are added in the process of manufacturing the chlorinated hydrocarbon paint remover so as to accelerate the damage of macromolecular chain segments, enhance the penetration and swelling effect of the main solvent to the coating and play a role in accelerating the paint removing. As is well known, most of paint strippers in the market adopt tinplate as a package, and an organic acid activator is added into a formula, so that a tank body is corroded after long-time storage, and potential quality and safety hazards exist.
On the other hand, in order to reduce or prevent the volatilization of methylene chloride as a main solvent, to allow sufficient time for it to stay and penetrate into an old coating film, to swell or dissolve the coating film and bite it, paraffin is often added as a volatilization inhibitor. However, paraffin easily remains on the surface of the substrate during the paint stripping process, which affects the adhesion of the new paint layer to the substrate. Therefore, when the paint remover with paraffin is used, the surface of the substrate must be thoroughly cleaned, and the residual paraffin must be completely removed, so that new paint can be applied again.
The prior art of paint strippers has been widely studied. CN201610712968.6 discloses a low-volatility paint remover, which is prepared from benzyl alcohol, methanol, hydroxyethyl propyl cellulose, ethyl cellulose, methyl fiber, formic acid, sodium hexametaphosphate, an anionic corrosion agent, polyoxyethylene alkylolamide and caprylic capric glyceride, and has the characteristics of high paint removing speed, good effect, low toxicity and the like; CN201510751796.9 discloses an environment-friendly stable paint remover and a preparation method thereof, which is prepared by using butyl acrylate, dichloromethane, diethyl carbonate, turpentine, methanol, formic acid, benzotriazole, dimethyl sulfoxide, calcium chloride, sodium dodecyl benzene sulfonate, hydrogen peroxide, paraffin, organic glass powder, water-soluble cellulose, distilled water and a stabilizing auxiliary agent, and has the characteristics of environmental protection, high paint removing efficiency, stable property and small volatility; (Xiongjin Ping, the research on high-efficiency paint remover, modern coating and painting, 03 2005, P7-9) discloses a formula of the paint remover, which is prepared from ethanol, phosphoric acid, hydrofluoric acid, paraffin, benzene, dichloromethane and acetone, and has the advantages of high efficiency, low volatilization, low cost and the like.
The above-mentioned reference documents mainly solve the technical defects of improving the paint removing efficiency and reducing the volatility, but do not relate to how to avoid or prevent the organic acid from corroding the tank body, and eliminate the quality and potential safety hazards; nor do they disclose improved stripping of vertical and oblique paint films, and removal of residual paraffin.
Therefore, the paint remover which has the characteristics of stable quality, high safety, low volatilization rate, high-efficiency paint removal and easy cleaning of residues, can slow down the loss rate of the paint remover constructed on the paint film on the vertical surface and the inclined surface and can prompt constructors to make construction protection has great economic and market significance.
Disclosure of Invention
An object of the present invention is to provide a method for preparing a paint stripper.
According to one aspect of the invention, the preparation method of the paint remover is provided, and the paint remover comprises the following steps in parts by weight:
s1, preprocessing paraffin, namely mixing 8.0-15.0 parts of DBE mixed dibasic acid ester, 2.0-5.0 parts of propylene glycol methyl ether and 0.8-2.2 parts of paraffin, heating to 86-110 ℃, and mutually dissolving until the mixture is transparent and has no block-shaped object by visual inspection to obtain a paraffin molten mixture;
s2, adding 1.5-3.5 parts of solvent oil and 18.0-28.0 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 3.5-10.0 parts of methanol and 33.0-48.0 parts of dichloromethane, keeping the temperature at 35-42 ℃, uniformly dispersing, adding 3.0-8.0 parts of formic acid microcapsules and 1.5-3.5 parts of emulsifier, and continuously dispersing for 5-10 min;
s5, adding 1.6-3.5 parts of thickening agent and 0.001-0.005 part of aversion agent, keeping the temperature at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
In some embodiments, in step S5, the filtered paint remover can be filled into an aerosol canister, vacuumized at a vacuum degree of-0.04 MPa to-0.08 MPa, placed into a valve and sealed, filled with a propellant, and mounted on a button to obtain the aerosol paint remover.
In some embodiments, the propellant is at least two of carbon dioxide, HFO-1234yf and HFO-1234ze, and the amount of the propellant is 15-28% of the total amount of the paint remover according to the weight portion. Therefore, the rapid vaporization and heat absorption of the propellant in the construction process of the product are ensured, the surface temperature of the workpiece to be depainted is reduced, the volatilization speed of the solvent is favorably slowed down, the solvent is convenient to permeate and swell a paint film, and the depainting effect is improved; by utilizing the double-pushing technology, the product is ensured to have the characteristics of good atomization effect, high ejection rate and the like.
In the steps, the temperature is kept at 35-42 ℃ to prevent the paraffin from being separated out and layered due to the fact that the environmental temperature is lower than 20 ℃.
The main components of the DBE mixed dibasic acid ester are dimethyl succinate, dimethyl glutarate and dimethyl adipate, the DBE mixed dibasic acid ester is a nontoxic, colorless and transparent liquid, has the fragrance of light ester, and is an environment-friendly high-boiling-point solvent capable of being biodegraded. Meanwhile, the paint has excellent dissolving power, has good solubility with polyurethane resin, acrylic resin, polyester resin, alkyd resin, epoxy resin and the like, and can effectively eliminate oil stains and dissolve paint films.
The solvent oil is a composition of 120# solvent oil and 200# solvent oil, and the solvent oil is prepared from the following components in parts by weight: 200# solvent oil =1:1 ~ 2.5.
In some embodiments, the dichloromethane is used as one of the main solvents, has the characteristics of small molecular weight and strong permeability, can quickly permeate into the gaps of the high polymer chain segments of the coating high polymer, enables the coating to expand to 3-4 times of the original value, and enables the coating to fall off from the substrate under the pressure and tension during expansion.
In some embodiments, the methanol is used as a cosolvent, and forms an azeotrope with the medium-high boiling point solvent HBS, the solvent oil, the ethylene glycol phenyl ether and the propylene glycol methyl ether, so that the methanol can sufficiently permeate into a coating film in cooperation with the main solvent, and the paint stripping speed is accelerated.
The formic acid microcapsule is a solid formic acid double-layer microcapsule, and a core material of the formic acid microcapsule is solid formic acid prepared from formic acid and curing agent urea according to the weight part ratio of 1: 1.5; the first layer of the wall material is ethyl cellulose, and the second layer of the wall material is sodium alginate.
The preparation method of the formic acid microcapsule comprises the following steps of:
a. adding 5-8 parts of toluene and 1.5 parts of ethanol into a three-neck flask with a reflux device, slowly adding 7-10 parts of ethyl cellulose to disperse until the ethyl cellulose is completely dissolved in a constant-temperature water bath at 70-75 ℃ and at a rotating speed of 300-500 r/min, and continuously dispersing for 5-10 min to obtain a dispersion liquid; then slowly adding a mixture of 45 parts of formic acid and curing agent urea into the dispersion liquid; slowly adding non-solvent petroleum ether under stirring until ethyl cellulose is coagulated, and stopping heating; standing, naturally cooling to room temperature, filtering, washing and drying to obtain the microcapsule coated by the ethyl cellulose.
b. Adding 20 parts of water into a three-neck flask, heating to 60 ℃, slowly adding 6 parts of sodium alginate while stirring, adding 18 parts of ethyl cellulose-coated microcapsule after the sodium alginate is completely dissolved, continuously stirring for 10min, stopping heating, cooling, filtering and drying to obtain the formic acid microcapsule coated by the sodium alginate and the ethyl cellulose.
In some embodiments of the invention, formic acid is formulated with the urea curing agent as solid formic acid, thereby avoiding reaction of formic acid with the first layer of wall material; the double-wall core is adopted, so that the formic acid microcapsule is effectively prevented from being dissolved by organic alcohol, ether and halogenated hydrocarbon, the formic acid is prevented from corroding a metal tank body, the potential quality and safety hazards are eliminated, and the storage stability of the product is improved.
When the solid formic acid double-layer microcapsule is used, the solid formic acid double-layer microcapsule is opened due to extrusion, the solid formic acid is dissolved in the organic solvent, formic acid molecules penetrate into and damage a macromolecular chain segment at an accelerated speed, the permeation and swelling effects of the main solvent on a coating are enhanced, and the effect of accelerating paint removal is achieved.
The paraffin is at least one of fully refined paraffin, OP wax and polyethylene wax.
Preferably, the paraffin is at least one of fully refined paraffin and OP wax, wherein the melting point of the fully refined paraffin is 56-60 ℃, and the melting point of the OP wax is 79-83 ℃.
The paraffin is used as a volatilization inhibitor, is uniformly dispersed in the paint remover after being melted, can form a sealing layer when being sprayed on the surface of a coating film, effectively retards the volatilization of a low-boiling-point solvent, has enough time to fully permeate into the gaps of the high polymer chain segments of a high polymer of the coating film, and enables the coating to expand, dissolve and fall off.
The emulsifier is triethanolamine oleate, has excellent emulsifying and dispersing properties, and has good emulsifying properties for mineral oil, vegetable oil, wax scale and the like.
The thickening agent is a composition of a American Keteng 1701 oily thickening agent and a Degussa hydrophilic A300 fumed silica thickening agent, and the weight parts of the thickening agent are as follows: a300 fumed silica = 2-3: 1. Therefore, the viscosity of the paint remover is improved, the contact time of the paint remover on a vertical surface and an inclined surface paint film is prolonged, the utilization rate of the product is improved, and the waste is reduced.
The aversion agent is denatonium benzoate. Therefore, the special odor is given to the product of the invention, so as to prevent poisoning caused by eating by mistake and prompt constructors to make construction protection.
The paint remover product prepared by the invention has the following beneficial effects:
1. the paint remover prepared by the invention has the advantages that formic acid is dually microencapsulated, so that the formic acid is prevented from corroding tinplate aerosol cans, the potential safety hazard of corrosion perforation is eliminated, and the stability of products is improved;
2. the paint remover prepared by the invention preferably selects a propellant capable of being rapidly vaporized, utilizes the characteristic of rapid vaporization and heat absorption of the propellant, reduces the temperature of the surface of a paint-removed coating, simultaneously slows down the volatilization of a low-boiling-point solvent and the loss rate of an inclined plane by cooperating with paraffin and a thickening agent, ensures that a small molecular solvent has enough time to fully permeate, dissolve, expand and remove a paint film, is suitable for improving the paint removing effect of vertical plane and inclined plane paints, and has the characteristics of flexible and simple use, good atomization effect and the like;
3. the paint remover prepared by the invention is added with the triethanolamine oleate emulsifier, which is beneficial to cleaning residual wax without influencing the adhesive force of a new paint layer to a matrix;
4. the paint remover prepared by the invention is added with the aversion agent, so that the product is endowed with special taste, poisoning caused by eating by mistake is prevented, and constructors are prompted to make construction protection.
Detailed Description
The present invention is illustrated by the following examples, but the present invention is not limited to these examples. Modifications to the embodiments of the invention or equivalent substitutions of parts of technical features without departing from the spirit of the invention are intended to be covered by the scope of the claims of the invention.
Example 1
The preparation method of the paint remover comprises the following steps in parts by weight:
s1, preprocessing paraffin, namely mixing 8 parts of DBE mixed dibasic acid ester, 4.997 parts of propylene glycol methyl ether and 2.2 parts of fully refined paraffin, heating to 86-110 ℃, and mutually dissolving until the mixture is visually transparent and has no block-shaped object, so as to obtain a paraffin molten mixture;
s2, adding 1.8 parts of No. 200 solvent oil, 1 part of No. 120 solvent oil and 25 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 10 parts of methanol and 33 parts of dichloromethane, keeping the temperature to be 35-42 ℃, uniformly dispersing, adding 8 parts of formic acid microcapsules and 2.5 parts of triethanolamine oleate emulsifier, and continuously dispersing for 5-10 min;
s5, adding 2.5 parts of G1701 oily thickener, 1 part of A300 fumed silica thickener and 0.003 part of bendinylammonium, preserving heat at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
In this embodiment, in step S5, 100 parts of the filtered paint remover may be filled into an aerosol canister, vacuumized at a vacuum degree of-0.04 MPa to-0.08 MPa, placed into a valve and sealed, filled with 6 parts of carbon dioxide and 22 parts of HFO-1234yf propellant, and mounted on a button to obtain the aerosol paint remover.
In other embodiments, the propellant may also be 8 parts carbon dioxide, 12 parts HFO-1234yf, or 10 parts carbon dioxide, 5 parts HFO-1234 yf.
The preparation method of 8 parts of formic acid microcapsule added in step S4 includes the steps of:
a. adding 5 parts of toluene and 1.5 parts of ethanol into a three-neck flask with a reflux device, slowly adding 7 parts of ethyl cellulose to disperse until the ethyl cellulose is completely dissolved in a constant-temperature water bath at 70-75 ℃ and at a rotating speed of 300-500 r/min, and continuously dispersing for 5-10 min to obtain a dispersion liquid; then a mixture of 18 parts of formic acid and 27 parts of curing agent urea is slowly added to the dispersion; slowly adding non-solvent petroleum ether under stirring until ethyl cellulose is coagulated, and stopping heating; standing, naturally cooling to room temperature, filtering, washing and drying to obtain the microcapsule coated by the ethyl cellulose.
b. Adding 20 parts of water into a three-neck flask, heating to 60 ℃, slowly adding 6 parts of sodium alginate while stirring, adding 18 parts of ethyl cellulose-coated microcapsule after the sodium alginate is completely dissolved, continuously stirring for 10min, stopping heating, cooling, filtering and drying to obtain the formic acid microcapsule coated by the sodium alginate and the ethyl cellulose.
Example 2
The preparation method of the paint remover comprises the following steps in parts by weight:
s1, preprocessing paraffin, namely mixing 10 parts of DBE mixed dibasic acid ester, 3.998 parts of propylene glycol methyl ether and 1.2 parts of OP wax, heating to 86-110 ℃, and mutually dissolving until the mixture is transparent and has no blocky object by visual observation to obtain a paraffin melting mixture;
s2, adding 2.5 parts of No. 200 solvent oil, 1 part of No. 120 solvent oil and 21 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 7 parts of methanol and 42 parts of dichloromethane, keeping the temperature to be 35-42 ℃, uniformly dispersing, adding 5 parts of formic acid microcapsules and 3.5 parts of triethanolamine oleate emulsifier, and continuously dispersing for 5-10 min;
s5, adding 2.1 parts of G1701 oily thickener, 0.7 part of A300 fumed silica thickener and 0.002 part of bendinylammonium, preserving heat at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
In this embodiment, in step S5, 100 parts of paint remover may be filled into an aerosol canister, and after vacuuming, valve opening and sealing, 6 parts of carbon dioxide and 22 parts of HFO-1234ze propellant are filled, and a button is mounted to obtain the aerosol paint remover.
In other embodiments, the propellant may also be 8 parts carbon dioxide, 12 parts HFO-1234ze, or 10 parts carbon dioxide, 5 parts HFO-1234 ze.
The preparation method of 5 parts of formic acid microcapsule added in step S4 includes the steps of: the preparation method of the formic acid microcapsule in example 1 was the same except that 8 parts of toluene and 9 parts of ethyl cellulose were used.
Example 3
The preparation method of the paint remover comprises the following steps in parts by weight:
s1, preprocessing paraffin, namely, mixing 12 parts of DBE mixed dibasic acid ester, 2.996 parts of propylene glycol methyl ether, 0.7 part of fully refined paraffin and 1.2 parts of OP wax, heating to 86-110 ℃, and mutually dissolving until the mixture is transparent to visual inspection and has no blocky objects, thus obtaining a paraffin molten mixture;
s2, adding 1 part of 200# solvent oil, 0.5 part of 120# solvent oil and 18 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 8 parts of methanol and 48 parts of dichloromethane, keeping the temperature to be 35-42 ℃, uniformly dispersing, adding 3 parts of formic acid microcapsules and 3 parts of triethanolamine oleate emulsifier, and continuously dispersing for 5-10 min;
s5, adding 1.1 part of G1701 oily thickener, 0.5 part of A300 fumed silica thickener and 0.004 part of bendinylammonium, preserving heat at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
In this embodiment, in step S5, 100 parts of paint remover may be filled into an aerosol canister, and after vacuuming, valve opening and sealing, 6 parts of carbon dioxide and 22 parts of HFO-1234yf propellant are filled, and the aerosol paint remover is obtained by mounting a button.
In other embodiments, the propellant may also be 8 parts carbon dioxide, 12 parts HFO-1234yf, or 10 parts carbon dioxide, 5 parts HFO-1234 yf.
The preparation method of 3 parts of formic acid microcapsule added in step S4 includes the following steps: the preparation method of the formic acid microcapsule in example 1 was the same except that 7 parts of toluene and 10 parts of ethyl cellulose were used.
Example 4
The preparation method of the paint remover comprises the following steps in parts by weight:
s1, preprocessing paraffin, namely mixing 15 parts of DBE mixed dibasic acid ester, 2 parts of propylene glycol methyl ether and 0.8 part of OP wax, heating to 86-110 ℃, and mutually dissolving until the mixture is transparent to the naked eye and has no blocky object, thus obtaining a paraffin melting mixture;
s2, adding 1.1 part of No. 200 solvent oil, 1.1 part of No. 120 solvent oil and 27.997 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 3.5 parts of methanol and 38 parts of dichloromethane, keeping the temperature to be 35-42 ℃, uniformly dispersing, adding 6 parts of formic acid microcapsules and 1.5 parts of triethanolamine oleate emulsifier, and continuously dispersing for 5-10 min;
s5, adding 2 parts of G1701 oily thickener, 1 part of A300 fumed silica thickener and 0.003 part of denatonium benzoate, preserving the temperature at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
In this embodiment, in step S5, 100 parts of paint remover may be filled into an aerosol canister, and after vacuuming, valve opening and sealing, 6 parts of carbon dioxide and 22 parts of HFO-1234ze propellant are filled, and a button is mounted to obtain the aerosol paint remover.
In other embodiments, the propellant may also be 8 parts carbon dioxide, 12 parts HFO-1234ze, or 10 parts carbon dioxide, 5 parts HFO-1234ze, or 6 parts carbon dioxide, 6 parts HFO-1234ze, 6 parts HFO-1234 yf.
The preparation method of 6 parts of formic acid microcapsule added in step S4 includes the steps of: the same procedure was followed as in the preparation of formic acid microcapsules in example 2.
After the products prepared in the above examples 1 to 4 were stored in a ventilated and dry place at normal temperature for 1 year, no abnormal corrosion and perforation occurred on the exterior of the tank, and further the tank was dissected and no abnormal rusting occurred inside the tank.
Comparative example 5: the components were the same as in example 4 except that 45.5 parts of methylene chloride, 0 part of formic acid microcapsule, 0 part of emulsifier and 3 parts of A300 fumed silica as a thickener were used. In this comparative example, the propellant was also changed to 28 parts liquefied petroleum gas.
Comparative example 6: the components were the same as in example 4 except that 38.8 parts of methylene chloride was used, 0 part of paraffin was used, 1.5 parts of sodium alkylbenzenesulfonate was used as an emulsifier, and 3 parts of A300 fumed silica was used as a thickener. In this comparative example, the propellant was also changed to 28 parts liquefied petroleum gas.
Comparative example 7: the procedure was as in example 4 except that 41 parts of methylene chloride was used, 0 part of a thickener was used, and 1.5 parts of sodium alkylbenzenesulfonate was used as an emulsifier. In this comparative example, the propellant was also changed to 28 parts liquefied petroleum gas.
The paint strippers prepared in examples 1 to 4 and comparative examples 5 to 7 were tested for their respective performances by the following methods.
1. Viscosity: the viscosity of the stripper feed at 25 ℃ was measured using a 4 cup coater.
2. Slope runoff rate: quickly and uniformly spraying or brushing the product on a zinc plate (the surface of which is coated with 150 mu m of double-component PU paint) with the size of 9cm multiplied by 12cm, wherein the spraying or brushing amount is controlled to be about 20 g; weighing the tare weight of the large baked wheat cake, then obliquely hanging the tinplate (forming an included angle of 60 degrees with the ground) in a large beaker, taking off the tinplate after 3min, and calculating the percentage of the paint remover added in the beaker in the spraying or brushing amount.
3. Volatilization rate: and (3) subtracting the weighed weight each time from the initial species by adopting a weighing method, wherein the ratio of the initial species to the initial species is the volatilization rate of the product. Spraying 20g of aerosol paint remover (100 parts of paint remover is filled into an aerosol can and filled with 6 parts of carbon dioxide and 22 parts of HFO-1234yf propellant) into a dry and clean beaker at room temperature; it was placed in the development room and the quality was measured every 1min and 10 min.
4. Adhesion of recoating paint film: the polyurethane baking paint of the zinc plate substrate is depainted by a chlorinated hydrocarbon depainting agent product, the polyurethane baking paint is washed clean by water, acrylic spray paint is sprayed again after the workpiece is dried, and the adhesive force of the paint film is measured by a circling method after the paint film is completely dried for 72 hours.
The index test results of the preparation methods of the paint removers prepared in examples 1 to 4 and comparative examples 5 to 7 are shown in the following table 1.
TABLE 1
As can be seen from Table 1, compared with comparative examples 4-7, the product prepared by the invention has high viscosity and low slope loss rate, is beneficial to slowing down the loss of the slope paint remover product, enables the small molecular low-boiling-point solvent in the paint remover to have enough time to permeate, dissolve and swell the paint film, improves the product utilization rate and simultaneously greatly improves the paint removal efficiency; the content of the propellant which is easy to vaporize and volatilize is planed, the volatilization rate of the product is low, and the paint removal utilization rate is high; after the workpiece to be depainted is washed clean by water and dried, the paint film which is brushed with new paint again has strong adhesive force.
5. Paint removal efficiency: reference is made to HG/T2881 1997 determination of paint stripper stripping efficiency. The paint variety is selected from two-component epoxy PU paint with a paint film thickness of 150 mu m and low-temperature curing baking paint, the substrate is a zinc plate, the prepared paint remover product is sprayed or brushed on the paint film, the paint removing effect is tested, and the obtained result is shown in Table 2.
TABLE 2
As can be seen from Table 2, the products prepared by the present invention have the advantages of rapid swelling and loosening of paint film, short paint removal time and high efficiency, compared with the prior art (comparative examples 5-7).
Claims (7)
1. The preparation method of the paint remover is characterized by comprising the following steps in parts by weight:
s1, preprocessing paraffin, namely mixing 8.0-15.0 parts of DBE mixed dibasic acid ester, 2.0-5.0 parts of propylene glycol methyl ether and 0.8-2.2 parts of paraffin, heating to 86-110 ℃, and mutually dissolving until the mixture is transparent and has no block-shaped object by visual inspection to obtain a paraffin molten mixture;
s2, adding 1.5-3.5 parts of solvent oil and 18.0-28.0 parts of dimethyl carbonate into a reaction cylinder, and heating to 36-42 ℃ while stirring;
the solvent oil is a composition of 120# solvent oil and 200# solvent oil, and the solvent oil is prepared from the following components in parts by weight: 1: 1-2.5 of No. 200 solvent oil;
s3, adding the paraffin wax molten mixture under the conditions of stirring and heat preservation at 36-42 ℃, and dispersing for 12-20 min until the mixture is uniformly mixed;
s4, adding 3.5-10.0 parts of methanol and 33.0-48.0 parts of dichloromethane, keeping the temperature at 35-42 ℃, uniformly dispersing, adding 3.0-8.0 parts of formic acid microcapsules and 1.5-3.5 parts of emulsifier, and continuously dispersing for 5-10 min;
the formic acid microcapsule is a solid formic acid double-layer microcapsule, a core material of the solid formic acid microcapsule is prepared by formic acid and curing agent urea according to the weight part ratio of 1:1.5, a first layer of a wall material is ethyl cellulose, and a second layer of the wall material is sodium alginate;
the preparation method of the formic acid microcapsule comprises the following steps in parts by weight:
a. adding 5-8 parts of toluene and 1.5 parts of ethanol into a three-neck flask with a reflux device, slowly adding 7-10 parts of ethyl cellulose to disperse until the ethyl cellulose is completely dissolved in a constant-temperature water bath at 70-75 ℃ and at a rotating speed of 300-500 r/min, and continuously dispersing for 5-10 min to obtain a dispersion liquid; then slowly adding a mixture of 45 parts of formic acid and a curing agent urea into the dispersion liquid; slowly adding non-solvent petroleum ether under stirring until ethyl cellulose is coagulated, and stopping heating; standing, naturally cooling to room temperature, filtering, washing and drying to obtain the microcapsule coated by the ethyl cellulose;
b. adding 20 parts of water into a three-neck flask, heating to 60 ℃, slowly adding 6 parts of sodium alginate while stirring, adding 18 parts of ethyl cellulose-coated microcapsule after the sodium alginate is completely dissolved, continuously stirring for 10min, stopping heating, cooling, filtering and drying to obtain a formic acid microcapsule coated by the sodium alginate and the ethyl cellulose;
s5, adding 1.6-3.5 parts of thickening agent and 0.001-0.005 part of aversion agent, keeping the temperature at 35-42 ℃, dispersing for 5-10 min until the mixture is uniform, and filtering to obtain the paint remover.
2. The method for preparing the paint remover according to claim 1, wherein in the step S5, the filtered paint remover can be filled into an aerosol can, the aerosol can is vacuumized under the vacuum degree of-0.04 MPa to-0.08 MPa, a valve is placed and sealed, a propellant is filled, and a button is mounted to obtain the aerosol paint remover; the propellant accounts for 15-28% of the total weight of the formula.
3. The method of claim 2, wherein the propellant is at least two of carbon dioxide, HF0-1234yf, and HF0-1234 ze.
4. The method of claim 1, wherein the paraffin wax in step S1 is at least one of fully refined paraffin wax, OP wax and polyethylene wax.
5. The method of claim 4, wherein the paraffin wax is at least one of a fully refined paraffin wax and an OP wax, and the melting point of the fully refined paraffin wax is 56 to 60 ℃ and the melting point of the OP wax is 79 to 83 ℃.
6. The method of claim 1, wherein the emulsifier in step S4 is triethanolamine oleate.
7. The method for preparing the paint remover according to claim 1, wherein the thickener in the step S5 is a composition of a cuneation G1701 oily thickener and a degussa hydrophilic a300 fumed silica thickener, and the weight parts of the G1701 oily thickener are as follows: a300 fumed silica is 2-3: 1; the aversion agent is denatonium benzoate.
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| CN115466537B (en) * | 2021-06-10 | 2023-05-26 | 嘉纳尔科技（北京）有限公司 | Paint remover capable of being used at lower temperature and preparation method thereof |
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| CN102040880A (en) * | 2009-10-19 | 2011-05-04 | 樊继田 | Method for preparing aerosol |
| CN105670376A (en) * | 2016-03-25 | 2016-06-15 | 哈尔滨飞机工业集团有限责任公司 | Paint remover and preparation method thereof |
| CN105709673B (en) * | 2016-03-30 | 2018-06-12 | 佛山市功能高分子材料与精细化学品专业中心 | A kind of microencapsulation material for coating water-soluble organic acid and its preparation method and application |
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