Environment-friendly paint remover and preparation method thereof

Abstract

The invention relates to the technical field of paint remover preparation, and discloses an environment-friendly paint remover and a preparation method thereof. According to the environment-friendly paint remover and the preparation method thereof, benzoic acid and each mixed solution are subjected to micro-esterification reaction under specific conditions, so that a paint film can be softened and is not easy to break when falling off, and the paint film is stripped into blocks. According to the environment-friendly paint remover and the preparation method thereof, the paint remover is non-flammable and non-explosive, does not contain toxic substances such as highly toxic, strong acid and strong alkali, is environment-friendly to human bodies, and can quickly and effectively remove various coatings including but not limited to epoxy paint, polyurethane paint, acrylic paint and the like within a short time (within one minute) at normal temperature. And the low odor has small irritation to human skin and respiratory tracts, is high in safety in the use process, is suitable for various base materials, such as aluminum pieces, copper pieces, alloys and stainless steel, keeps the base materials not blackened and discolored, reduces the oxidation of the base materials, and is easy to clean. And iron pieces and steel are not oxidized or rusted.

Description

Technical Field

[0001] The invention relates to the technical field of paint stripper preparation, in particular to an environmentally friendly paint stripper and a preparation method thereof. Background Art

[0002] The modern manufacturing industry has continuously improved the requirements for product appearance and quality. Surface treatment by painting can prevent metal materials from corrosion and oxidation and extend their service life. It can also increase the hardness and wear resistance of the surface. High-quality spraying technology can improve the quality and grade of products, give products beautiful appearance and meet the aesthetic needs of consumers. This will increase the added value of products. There is a certain proportion of defective products in the spraying and painting process. Spraying products that do not meet quality requirements but still have valuable substrates can be re-sprayed or recycled after stripping, reducing resource waste. Compared with manufacturing new products, stripping and re-painting can greatly reduce the cost of production. Reduce production costs.

[0003] Traditional paint strippers are mainly divided into two categories. One is a solvent-based paint stripper that uses dichloromethane as the main raw material, strong acid (hydrofluoric acid, nitric acid) as a promoter, and phenol as a penetrant. Because this type of strong acid paint stripper is highly corrosive, phenol is highly toxic and has a strong irritating odor, and its operation and use are prone to cause production accidents, posing a huge safety hazard to the operator's personal safety. In addition, the strong corrosiveness damages the surface of the substrate, causing deformation, rust, oxidation, and changes in its material properties. Affects the secondary surface treatment and the quality of spray painting. It is not convenient to transport and store. The second type is based on sodium silicate and sodium hydroxide as the main raw materials, and the surface The activator is an accelerator, which uses strong alkali and high temperature to strip the paint surface. It needs to be heated up and the paint stripping time is long and the efficiency is low. The strong corrosiveness can easily cause deformation and rust on the substrate, and change its material properties.

[0004] Therefore, a paint stripping machine with fast speed, safety and environmental protection, low odor, no harm to hands, no corrosion and no rust, normal temperature and no heating, PH The value is 7-7.5, and the environmentally friendly paint stripper that does not damage the substrate is of great significance. The present invention uses decafluoropentane and diethylene glycol ester with mild, safe and stable odor as main raw materials, dichloromethane flame retardant, benzoic acid as promoter, and modified liquid paraffin as stabilizer. The paint stripping and plastic stripping before re-spraying of metal materials after electrophoresis coating, painting, and plastic spraying are prepared by catalyst reaction. The paint stripping and plastic stripping of fixtures are efficient and fast, safe and environmentally friendly, non-flammable and non-explosive, low odor and no harm to hands, no need to heat, can be used at room temperature, low pH value, no corrosion, no oxidation, no rust, no residue and easy to clean, and can completely replace strong acid and strong alkali paint strippers. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the deficiencies in the prior art, the present invention provides an environmentally friendly paint stripper and a preparation method thereof, which has the advantages of high efficiency, environmental protection, safety, and versatility, and solves the problem of long paint stripping time and low efficiency.

[0006] (II) Technical solution In order to achieve the above-mentioned non-flammable and non-explosive purposes, the present invention provides the following technical solutions: an environmentally friendly paint stripper, comprising the following raw materials in the following weight proportions: weighing 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, 2-10 parts of dichloromethane 3, 2-6 parts of benzoic acid, 2-4 parts of modified liquid paraffin, and 12 parts of X4501.

[0007] Another technical problem to be solved by the present invention is to provide a method for preparing an environmentally friendly paint stripper, comprising the following steps: S1. Raw material mixing Weigh 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, and 2-10 parts of dichloromethane 3, add them into a reaction tank, stir them evenly at room temperature to obtain a first mixed solution, and then add 4-6 parts of an accelerator to obtain a second mixed solution.

[0008] S2. Raw material mixing Add 2-3 parts of dichloromethane as a stabilizer and 10-12 parts of other additives in sequence, and continue stirring until the mixture is evenly mixed. Under the action of the stabilizer, the mixed solution does not separate into layers and the volatility is significantly reduced.

[0009] S3. Adjust pH value Other additives are added in multiple steps to adjust the pH value, stabilizing the pH value at 7-7.5, preventing aluminum, copper, alloys, and stainless steel from turning black or changing color, reducing oxidation of the substrate, making it easy to clean, and preventing iron and steel from oxidizing or rusting.

[0010] (III) Beneficial effects Compared with the prior art, the present invention provides an environmentally friendly paint stripper and a preparation method thereof, which has the following beneficial effects: 1. The environmentally friendly paint stripper and its preparation method are non-flammable and non-explosive, do not contain toxic substances such as strong acids and alkalis, are friendly to the human environment, and can quickly and effectively remove various coatings in a short time (within 1 minute) at room temperature, including but not limited to epoxy paint, polyurethane paint, acrylic paint, etc. and electrophoresis, powder spraying, and plastic spraying coatings. It has low odor and little irritation to human skin and respiratory tract. It is highly safe during use and is suitable for a variety of substrates, such as aluminum, copper, alloys, and stainless steel. It does not turn black or discolor, reduces substrate oxidation, and is easy to clean. It does not oxidize or rust iron and steel.

[0011] 2. The environmentally friendly paint stripper and its preparation method have low volatility and reduce the emission of volatile organic compounds (VOCs). It can release and reduce air pollution. It can quickly and effectively remove various types of paint, including different resin systems and coating thicknesses. It can maintain good paint stripping effects in a wide temperature range and adapt to different use environments. It has good chemical stability and is not easy to decompose or deteriorate. It ensures stable performance during storage and use. It is easy to use and can be stripped by brushing, soaking, spraying and other methods. No complicated equipment and processes are required during the paint stripping process, which reduces the cost of use and the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor: Figure 1 It is a time variation diagram of paint stripping of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Embodiments, and all other embodiments obtained by ordinary technicians in this field without making creative work, are within the scope of protection of the present invention.

[0014] The present invention provides the following technical solutions: An environmentally friendly paint stripper comprises the following raw materials in a weight ratio: 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, 2-10 parts of dichloromethane 3, 2-6 parts of benzoic acid, 2-4 parts of modified liquid paraffin, and 12 parts of X4501. Code-named X4501 is triethanolamine, which is mainly used to adjust the pH value of the solution because of its relatively low alkalinity and easy mixing with the solvent without stratification. The modified liquid paraffin in the present application is a purchased finished material, which is made by grafting reaction of styrene and liquid paraffin as reaction raw materials under the action of an initiator dibenzoyl peroxide.

[0015] Another technical problem to be solved by the present invention is to provide a method for preparing an environmentally friendly paint stripper, comprising the following steps: S1. Raw material mixing Weigh 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, and 2-10 parts of dichloromethane 3, add them into a reaction tank, stir them evenly at room temperature to obtain a first mixed solution, and then add 4-6 parts of an accelerator to obtain a second mixed solution.

[0016] S2. Raw material mixing Add 2-3 parts of dichloromethane as a stabilizer and 10-12 parts of other additives in sequence, and continue stirring until the mixture is evenly mixed. Under the action of the stabilizer, the mixed solution does not separate into layers and the volatility is significantly reduced.

[0017] S3. Adjust pH value Other additives are added in multiple steps to adjust the pH value, stabilizing the pH value at 7-7.5, preventing aluminum, copper, alloys, and stainless steel from turning black or changing color, reducing oxidation of the substrate, making it easy to clean, and preventing iron and steel from oxidizing or rusting.

[0018] Benzoic acid can speed up the paint stripping reaction. Experiments show that after adding this accelerator, the paint stripping time is shortened by about 30% compared with when it is not added. Modified liquid paraffin can protect the substrate from corrosion and reduce volatility. X4501 is used to enhance the speed of glue and paint, adjust the performance of the paint stripper, and adjust the pH value.

[0019] Changes of benzoic acid addition on paint stripping time 1. Sample: stainless steel thermos cup. Primer and color paint are epoxy and acrylic paints, clear paint is PU and UV paint, three sprays and three bakes at 100-150 degrees. Paint film thickness is 70u-90u.

[0020] 2. Test equipment: 10 glass beakers, 10 defective stainless steel thermos cups of the same batch of a certain brand, dropper, glass rod, pH test paper, PE container, electronic scale, rubber gloves, camera, timer, 10 portions of the paint stripper of this test with different amounts of benzoic acid added to each portion at 500 g.

[0021] Conclusion: In the same sample test, the paint stripper with 6 parts of benzoic acid solution has the highest paint stripping efficiency, and the time is about 54 seconds.

[0022] Slowly add 4 to 6 parts of a specially selected accelerator to the first mixed solution. The selection of this accelerator is crucial, as it can effectively catalyze the micro-esterification reaction between benzoic acid and trace components in the mixed solution. This is because the micro-esterification reaction between benzoic acid and diethylene glycol ether is a typical esterification reaction between an acid and an alcohol. The carboxyl group (-COOH) in benzoic acid (C7H6O2) reacts with diethylene glycol ether (C4H 10O3) reacts under certain conditions, removing a molecule of water (H2O) to form an ester bond (-COO-). The reaction equation is as follows: C7H6O2+C4H 10 O3═C 11 H 14 O4+H2O The generated diethylene glycol benzoate has the properties of esters. It is an organic compound with a certain polarity and a relative molecular mass of 210.23. At room temperature, it may be a colorless or light yellow liquid (depending on the purity), with low volatility and good solubility; the promoter component is formic acid, which is strongly acidic and can provide protons (H+) to activate the carboxyl group of benzoic acid, making it easier to react with the hydroxyl group of diethylene glycol ether.

[0023] First, accurately weigh 50 to 58 parts of decafluoropentane (as the main solvent, which promotes the After the above components are mixed, they are placed in a reaction tank and stirred vigorously at room temperature to ensure that the components are evenly mixed to form a clear and transparent first mixed solution. Then, 4 to 6 parts of a specially selected accelerator are slowly added to the first mixed solution. The selection of this accelerator is crucial. It can effectively catalyze the micro-esterification reaction of benzoic acid and trace components in the mixed solution. This reaction not only allows the paint film to maintain toughness and avoid cracking during the softening process, but also ensures The paint film after stripping can be peeled off in pieces and is insoluble in the residual solvent, thereby maintaining the clarity of the paint stripper for subsequent cleaning. After this step is completed, the second mixed solution with high paint stripping ability is obtained. In order to further improve the stability and use effect of the paint stripper, 2 to 3 parts of dichloromethane are added in steps as a stabilizer. This stabilizer can significantly reduce the mixing The stratification of the solution is reduced, and volatility is reduced, making the operation safer and more controllable. Subsequently, 10 to 12 parts of other additives are added in batches and in appropriate amounts. These additives are carefully selected and are mainly used to accurately adjust the pH value of the solution to between 7 and 7.5. This pH range is essential for protecting substrates (such as aluminum, copper, alloys, and stainless steel) from oxidation and discoloration, while ensuring that metal substrates such as iron and steel are not oxidized or rusted, and are easy to clean subsequently. The entire preparation process focuses on both environmental protection and high efficiency. By precisely controlling the proportion of each component and the reaction conditions, the generation of harmful by-products is minimized. In addition, all additives are strictly screened to ensure that they are harmless to the human body and the environment. The final paint stripper not only has a significant paint stripping effect, but is also substrate-friendly and easy to clean, greatly extending the life cycle of the paint stripper and reducing the cost of use, which meets the requirements of green development of modern industry.

[0024] After the above operation, the paint stripper can be obtained, which is non-flammable and non-explosive, and does not contain toxic substances such as strong acids and alkalis. It is friendly to the human environment and can quickly and effectively remove various types of coatings in a short time (within 1 minute) at room temperature, including but not limited to epoxy paint, polyurethane paint, acrylic paint, etc. As well as electrophoresis, powder coating, and plastic spray coating, it has low odor and little irritation to human skin and respiratory tract, and is highly safe during use. It is suitable for a variety of substrates, such as aluminum, copper, alloy, and stainless steel, which remain black and discolored, reduce substrate oxidation, and are easy to clean. It does not oxidize or rust iron and steel, and has low volatility, reduces the emission of volatile organic compounds (VOCs), and reduces air pollution. It can quickly and effectively remove various types of paint, including different resin systems and coating thicknesses, and can maintain good paint stripping effects in a wide temperature range, adapt to different use environments, have good chemical stability, and is not easy to decompose or deteriorate, ensuring stable performance during storage and use. It is easy to use and can be stripped by brushing, soaking, spraying, and other methods. No complex equipment and processes are required during the stripping process, reducing the cost of use and the difficulty of operation.

[0025] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that Various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly paint stripper, characterized in that: The method comprises the following raw materials in proportion by weight: weighing 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, 2-10 parts of dichloromethane 3, 2-6 parts of benzoic acid, 2-4 parts of modified liquid paraffin, and 12 parts of X4501.

2. The method for preparing an environmentally friendly paint stripper according to claim 1, characterized in that: The following steps are included: S1. Raw material mixing Weigh 50-58 parts of decafluoropentane 1, 12-20 parts of diethylene glycol ether 2, and 2-10 parts of dichloromethane 3, add them into a reaction tank, stir them evenly at room temperature to obtain a first mixed solution, and then add 4-6 parts of an accelerator to obtain a second mixed solution; S2. Raw material mixing Add 2-3 parts of dichloromethane as stabilizer and 10-12 parts of other additives in sequence, and continue stirring until the mixture is uniform. Under the action of the stabilizer, the mixed solution does not separate into layers and the volatility is significantly reduced; S3. Adjust pH value Add other additives in multiple steps to adjust the pH value, stabilize the pH value at 7-7.5, keep aluminum, copper, alloy, and stainless steel from turning black or changing color, reduce oxidation of the substrate, easy to clean, and no oxidation or rust on iron and steel.

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