Neutral environment-friendly oil and rust removal agent, portable oil and rust removal film and preparation method

Abstract

The invention belongs to the technical field of oil and rust removal, and particularly provides a neutral environment-friendly oil and rust removal agent, an oil and rust removal multilayer film and a preparation method of the oil and rust removal multilayer film. According to the neutral environment-friendly oil and rust remover, the chelating agent, the organic acid, the solvent, the compound active factor additive and the corrosion inhibitor are adopted as raw materials and are proportioned according to a proper weight ratio, and the finally prepared neutral environment-friendly oil and rust remover can quickly clean and treat oil dirt and rust on the surface of metal, and is short in rust removal time, high in efficiency and low in cost. Therefore, daily cleaning of metal and surface treatment before paint spraying and coating can be guaranteed; the neutral environment-friendly oil and rust remover has selectivity, only reacts with metal rust and does not react with iron and copper, and the metal surface is protected to the maximum extent; the neutral environment-friendly oil and rust removing agent contains anti-rust components, metal can be effectively prevented from being rusted again while rust is removed, and the service life of a metal product is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of oil removal and rust removal, and specifically relates to a neutral and environmentally friendly oil removal and rust removal agent, a portable oil removal and rust removal multi-layer film and a preparation method thereof. Background Art

[0002] Metal products are easily affected by environmental factors and chemicals during use, causing rust. Traditional rust removal methods mainly include physical mechanical rust removal and chemical rust removal, but these methods have some disadvantages, such as complex operation, low efficiency, and high cost. In addition, most existing rust removal products lack portability and selectivity, and are difficult to meet the needs of modern industrial and household use.

[0003] Physical and mechanical rust removal usually uses tools or mechanical equipment (such as grinding wheels, wire brushes, sandblasting machines, etc.) to remove the rust layer on the metal surface. Although this method is highly efficient, it is easy to damage the metal surface and has high labor intensity. It is not suitable for large-scale or complex rust removal. In addition, a large amount of dust will be generated during the physical rust removal process, which does not meet environmental protection requirements.

[0004] Chemical rust removal uses chemical reactions to dissolve or transform rust. Common methods include pickling, alkaline washing and electrolytic rust removal. The advantages of this method are good rust removal effect, fast speed, and applicability to various types of metal materials. However, chemical rust removal requires the use of chemicals, which may cause harm to the environment and human health, and requires certain skills and experience to operate. For example, although traditional strong acid rust removers are effective, they will produce acid mist to pollute the environment and may cause hydrogen embrittlement.

[0005] In order to overcome the shortcomings of traditional rust removal methods, some new rust removal technologies have been developed in recent years, such as electrochemical rust removal, ultrasonic rust removal and laser rust removal. Electrochemical rust removal uses electric current redox reaction to remove rust, which is clean and scratch-free, but requires special equipment and power supply. Ultrasonic rust removal uses high-frequency vibration signals to clean rust on the metal surface, which is environmentally friendly and causes little damage to the metal, but also requires special equipment. Laser rust removal irradiates the rust layer with a high-energy laser beam, causing the rust layer to evaporate or decompose instantly. It is suitable for rust removal of precision parts, but the equipment is expensive and not widely used. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a neutral environmentally friendly oil and rust removal agent with short rust removal time and high efficiency, a portable oil and rust removal multi-layer film and a preparation method thereof. The neutral environmentally friendly oil and rust removal agent of the present invention can quickly clean and treat oil stains and rust on the metal surface, and the rust removal time is short and the efficiency is high, thereby ensuring the daily cleaning of the metal and the treatment of the surface before painting. The oil and rust removal multi-layer film prepared by the neutral environmentally friendly oil and rust removal agent of the present invention is portable and quick, has a small size, can be carried around, and is convenient to use in various occasions. The oil and rust removal multi-layer film of the present invention is easy to operate and can easily complete the rust removal operation.

[0007] The technical solution adopted by the present invention is: The first aspect of the present invention provides a neutral environmentally friendly degreasing and rust removing agent, the raw material components comprising: Chelating agent, 5-20 parts by weight; Organic acid, 5-30 parts; Corrosion inhibitor, 0-8 parts by weight; Solvent, 1-10 parts by weight; Compound active factor auxiliary agent, 0-5 parts by weight.

[0008] Preferably, the organic acid is one or a combination of hydroxyethylidene diphosphonic acid, phytic acid, aminosulfonic acid, oxalic acid, and malic acid.

[0009] Preferably, the chelating agent is one or a combination of sodium citrate, sodium gluconate, ethylenediaminetetraacetic acid, diethyltriacetic acid, and sodium glutamate diacetate.

[0010] Preferably, the corrosion inhibitor is one or a combination of sodium molybdate, sodium phytate, hexamethylenetetramine and zinc acetate.

[0011] Preferably, the solvent is one or a combination of isopropyl alcohol, ethylene glycol, isobutyl alcohol, and propylene glycol butyl ether.

[0012] Preferably, the compound active factor auxiliary agent is one or a combination of surfactants selected from rhamnolipids, trehalose lipids, sophorolipids, polyoxyethylene alkylphenyl ethers, and alkyl polysaccharides.

[0013] The compound active factor auxiliary agent is a mixture of sophorolipids and polyoxyethylene alkyl phenyl ether in a mass ratio of 1:2-2:1.

[0014] The inventors of the present application have found in long-term research that the active factor auxiliary agent is mainly a compound optimization of the biosurfactant sophorolipid obtained by microbial culture, fermentation and purification and the non-ionic surfactant polyoxyethylene alkyl phenyl ether. The active factor auxiliary agent has very good water solubility and solubility, can significantly reduce the energy of the liquid interface, and plays a solubilizing role in various solvent components of the rust remover.

[0015] The materials of the compound active factor additives have high dispersion and penetration capabilities. After being added, they can help remove stubborn dirt on the surface of the rust surface, dredge tiny pores, and make the complex metal rust surface easier to remove; in addition, by reducing the surface tension of the rust removal solution, it can help the small organic acid molecules in the rust removal solution to quickly penetrate into the more difficult to penetrate rust middle layer and reach the surface of the iron matrix; it can also enhance the interaction between the chelating agent material and the iron ions in the rust removal solution, so that the rust removal material can better combine with the iron matrix, thereby comprehensively improving the rust removal effect of the rust removal material.

[0016] The second aspect of the present invention provides a method for preparing the neutral environmentally friendly degreasing and rust removing agent, comprising the following steps: (a) taking a chelating agent by weight and dissolving it in water under stirring; (b) adding a corrosion inhibitor to the solution system obtained in step (a), and stirring to fully dissolve the corrosion inhibitor; (c) adding a solvent to the solution system obtained in step (b), and stirring and mixing the mixture thoroughly; (d) adding an organic acid and a composite active factor auxiliary agent to the solution system obtained in step (c) in sequence, and continuing stirring for 5-10 minutes. After standing, adjusting the pH value to obtain the neutral environmentally friendly degreasing and rust removing agent.

[0017] Preferably, in step (d), after standing, the pH is adjusted to 5-7 with a NaOH solution.

[0018] The third aspect of the present invention provides a method for preparing a degreasing and rust-removing multilayer film using the neutral environmentally friendly degreasing and rust-removing agent, comprising the following steps: (1) neutral environmentally friendly degreasing and rust removing agent, activated carbon and diatomaceous earth are taken in a mass ratio of 30:1:2, mixed thoroughly and evenly, and a certain amount of super absorbent resin (polyacrylic acid salt super absorbent resin, PAM) is added, and mixed thoroughly and evenly under stirring conditions to obtain a paste mixture; (2) The mixed paste is put into a non-woven bag, and a layer of non-woven film adsorbed with a neutral environmentally friendly degreasing and rust removing agent is applied on both sides to obtain the degreasing and rust removing multi-layer film.

[0019] In step (1), the mass ratio of the super absorbent resin to the neutral environmentally friendly degreasing and rust removing agent is 1:5.

[0020] The working mechanism of the rust remover of the present invention is as follows: after the organic acid and chelating agent in the rust remover contact the rust, the wetting and penetration promoting effect of the compound active factor auxiliary agent and the solvent is used to increase the contact area with the rust, accelerate the reaction between the organic acid and the chelating agent and the rust, dissolve and remove the rust, form metal ions after the rust is dissolved, and the chelating agent chelates with the metal ions to prevent the metal ions from precipitating and oxidizing to form rust again. The corrosion inhibitor can prevent the rust remover from corroding the metal matrix too much. For example, hydroxyethylidene diphosphonic acid (HEDP) is not very acidic, has mild performance, and has certain chelation and phosphating effects. Its molecular formula is C2H8O7P2. It can form stable complexes with various metal ions such as Fe, Cu, and Zn, and can dissolve metal oxides such as copper oxide and iron oxide. It is suitable for the preparation of multi-purpose metal surface cleaning agents and corrosion inhibitors. As a kind of organic phosphonic acid, the P element contained therein can play a phosphating role in the inorganic phosphating experiment, forming a dense corrosion-resistant film layer on the metal surface, greatly improving the corrosion resistance of the metal. In addition, HEDP has a strong complexing effect on rust, the reaction is relatively mild, and it also has a certain anti-corrosion effect. The compound active factor additives such as sophorolipids and polyoxyethylene alkylphenyl ether can quickly penetrate into the rust, react chemically with iron oxide molecules, and decompose them into substances that are easily soluble in water, so that the rust can be easily washed away. The appropriate solvent can make the system suspended and stable, so that the rust removal solution system maintains uniform components, and at the same time it can also play a certain wetting role on the rust removal solution, playing a certain role in assisting rust removal.

[0021] The present invention has the following beneficial effects: (1) The present invention provides a neutral and environmentally friendly degreasing and rust removing agent, which adopts chelating agent, organic acid, corrosion inhibitor, solvent, and compound active factor auxiliary agent as raw materials and carries out appropriate weight ratio. Among them, the chelating agent mainly increases the reaction rate of organic acid with metal and its oxide, forms a stable complex with metal ions, and prevents metal ion precipitation and oxidation; the organic acid reacts chemically with rust to dissolve and remove the rust, and the acidity is relatively weak, the reaction is relatively mild, and the corrosiveness to the metal is relatively small. It reacts with the metal matrix to form a dense oxide layer to prevent rust; the corrosion inhibitor slows down the acid corrosion of the metal during the rust removal process and protects the matrix; the solvent can maintain the uniformity of the various components of the rust remover and ensure that the various components play a rust removal role; the compound active factor auxiliary agent can strongly improve the wettability of the rust remover on the metal surface, promote the dissolution of metal rust, and improve the rust removal efficiency; at the same time, it helps to remove impurities such as oil stains. The neutral and environmentally friendly degreasing and rust removing agent finally prepared can quickly clean and treat oil stains and rust on the metal surface, with a short rust removal time and high efficiency, thereby ensuring daily cleaning of the metal and surface treatment before painting; the neutral and environmentally friendly degreasing and rust removing agent described in the present invention is selective, only reacts with metal rust, does not react with iron and copper, and protects the metal surface to the maximum extent; the neutral and environmentally friendly degreasing and rust removing agent described in the present invention contains an organic acid as an anti-rust ingredient, and while removing rust, it can effectively prevent the metal from rusting again, thereby extending the service life of metal products.

[0022] (2) The degreasing and rust-removing multilayer film prepared based on the neutral environmentally friendly degreasing and rust-removing agent of the present invention is portable and quick, small in size, can be carried around, and is convenient to use in various occasions. The degreasing and rust-removing multilayer film of the present invention is easy to operate and can easily complete the rust removal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 The figure shows the appearance comparison of the test piece before and after rust removal by the neutral environmentally friendly oil-removing and rust-removing agent described in Example 5 of the present invention and two commercially available neutral rust-removing agents; wherein A is the appearance comparison of the test piece before and after rust removal by the neutral environmentally friendly oil-removing and rust-removing agent obtained in Example 5, B is the appearance comparison of the test piece before and after rust removal by the commercially available neutral rust-removing agent 1, and C is the appearance comparison of the test piece before and after rust removal by the commercially available neutral rust-removing agent 2; Figure 2The figure shows the appearance comparison of the test piece before and after rust removal using the two neutral and environmentally friendly degreasing and rust removing agents of Example 2 and Example 5 of the present invention; wherein A is the appearance comparison of the test piece before and after rust removal using the neutral and environmentally friendly degreasing and rust removing agent obtained in Example 5, and B is the appearance comparison of the test piece before and after rust removal using the neutral and environmentally friendly degreasing and rust removing agent obtained in Example 2; Figure 3 The display shows the comparison of the facade appearance before and after rust removal using the neutral and environmentally friendly oil-removing and rust-removing multi-layer film described in Example 5 of the present invention; wherein A is before rust removal, B is during rust removal, and C is after rust removal. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0026] In the following examples, 1 part by weight represents 1 g.

[0027] Example 1 Sophorolipids and polyoxyethylene alkylphenyl ether were compounded in different proportions to form 5 kinds of active factor auxiliary agent solutions with a total concentration of 20% (the solvent was water), and the surface tension of these compounded active factor auxiliary agents was tested respectively. The specific results are shown in Table 1.

[0028] Table 1 Comparison of surface tension of various compound active factor additive solutions Group No. Sophorolipids: Polyoxyethylene alkylphenyl ether Surface tension (mN·m) Compound active factor additive No. 1 0:1 25.1 Compound active factor additive No. 2 1:2 23.7 Compound active factor additive No. 3 1:1 22.5 Compound active factor additive No. 4 2:1 23.3 Compound active factor additive No. 5 1:0 24.8 Among them, the compound active factor additive No. 3 has the lowest surface tension value.

[0029] Example 2 This embodiment provides a neutral environmentally friendly degreasing and rust removing agent, the raw material components include: Chelating agent sodium citrate, 10 parts by weight; Chelating agent sodium gluconate, 2 parts by weight Hydroxyethylidene diphosphonic acid, 10 parts by weight; Phytic acid, 1 part by weight; Corrosion inhibitor zinc acetate, 0.25 parts by weight; Solvent isopropanol, 5 parts by weight; Water, 71.75 parts by weight.

[0030] The preparation method of the neutral environmentally friendly degreasing and rust removing agent is as follows: (a) adding the above-mentioned chelating agent in parts by weight into a stirred tank and fully dissolving it in water under stirring; (b) adding a corrosion inhibitor to the solution system obtained in step (a), and stirring until the components are fully dissolved; (c) slowly adding the solvent to the solution obtained in step (b) while stirring at a constant speed, and stirring and mixing thoroughly; (d) Slowly adding an organic acid to the solution system obtained in step (c), stirring for 10 minutes after the addition is completed, and adjusting the pH value to 5.5 with a NaOH solution after standing, thereby obtaining the neutral environmentally friendly degreasing and rust removing agent No. 0.

[0031] Example 3 Slowly add 3% of the compound active factor auxiliary agent No. 1 obtained in Example 1 to the neutral environmentally friendly degreasing and rust removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly degreasing and rust removing agent No. 1.

[0032] Example 4 Slowly add 3% of the compound active factor auxiliary agent No. 2 obtained in Example 1 to the neutral environmentally friendly degreasing and rust removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly degreasing and rust removing agent No. 2.

[0033] Example 5 Slowly add 3% of the composite active factor auxiliary agent No. 3 obtained in Example 1 to the neutral environmentally friendly oil-removing and rust-removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly oil-removing and rust-removing agent No. 3.

[0034] Furthermore, a method for preparing a degreasing and rust-removing multilayer film using the neutral environmentally friendly degreasing and rust-removing agent No. 3 comprises the following steps: Pour 30g of neutral environmentally friendly oil and rust remover No. 3, 1g of activated carbon and 2g of diatomaceous earth into a beaker, stir evenly, then add 6g of super absorbent resin (polyacrylic acid salt super absorbent resin, PAM) to make the mixture into a paste; put the mixture into a non-woven bag, and stick a layer of non-woven cleaning film containing neutral environmentally friendly oil and rust remover (prepared by impregnating non-woven fabric with neutral environmentally friendly oil and rust remover) on each side; finally put it into a plastic bag and package it to obtain an oil and rust removal multi-layer film.

[0035] Example 6 Slowly add 3% of the compound active factor auxiliary agent No. 4 obtained in Example 1 to the neutral environmentally friendly degreasing and rust removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly degreasing and rust removing agent No. 4.

[0036] Example 7 Slowly add 3% of the composite active factor auxiliary agent No. 5 obtained in Example 1 to the neutral environmentally friendly oil-removing and rust-removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly oil-removing and rust-removing agent No. 5.

[0037] Example 8 Slowly add 1% of the compound active factor auxiliary agent No. 3 obtained in Example 1 to the neutral environmentally friendly degreasing and rust removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly degreasing and rust removing agent No. 6.

[0038] Example 9 Slowly add 2% of the compound active factor auxiliary agent No. 3 obtained in Example 1 to the neutral environmentally friendly degreasing and rust removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly degreasing and rust removing agent No. 7.

[0039] Example 10 Slowly add 4% of the compound active factor auxiliary agent No. 3 obtained in Example 1 to the neutral environmentally friendly oil-removing and rust-removing agent No. 0 solution system obtained in Example 2, and stir and mix thoroughly after adding to obtain the neutral environmentally friendly oil-removing and rust-removing agent No. 8.

[0040] Embodiment 11 This embodiment provides a neutral environmentally friendly degreasing and rust removing agent, the raw material components include: Chelating agent sodium citrate, 8 parts by weight; Hydroxyethylidene diphosphonic acid, 5 parts by weight; Phytic acid, 2 parts by weight; Sulfamic acid, 2 parts by weight; Corrosion inhibitor sodium gluconate, 5 parts by weight; Solvent isopropanol, 8 parts by weight; Compound active factor auxiliary agent No. 3, 3 parts by weight; Water, 68 parts by weight.

[0041] The preparation method of the neutral environmentally friendly degreasing and rust removing agent is as follows: (a) taking the chelating agent according to the above weight parts, adding it into a stirred tank, and fully dissolving it in water under stirring; (b) adding a corrosion inhibitor to the solution system obtained in step (a), and stirring until the components are fully dissolved; (c) adding a solvent to the solution obtained in step (b) while stirring at a constant speed, and stirring and mixing the mixture thoroughly; (d) Slowly adding organic acid and compound active factor additive No. 3 to the solution system obtained in step (c) in sequence, stirring for 10 minutes after the addition until the mixture is evenly mixed, and adjusting the pH value to 6.5 with NaOH solution after standing to obtain the neutral environmentally friendly degreasing and rust removing agent No. 9.

[0042] Example 12 This embodiment provides a neutral environmentally friendly degreasing and rust removing agent, the raw material components include: Chelating agent sodium citrate, 10 parts by weight; Chelating agent sodium gluconate, 1 part by weight Hydroxyethylidene diphosphonic acid, 7 parts by weight; Corrosion inhibitor zinc acetate, 0.25 parts by weight; Solvent isopropanol, 5 parts by weight; Compound active factor auxiliary agent No. 3, 3 parts by weight; Water, 73.75 parts by weight.

[0043] The preparation method of the neutral environmentally friendly degreasing and rust removing agent is as follows: (a) taking the chelating agent according to the above weight parts, adding it into a stirred tank, and fully dissolving it in water under stirring; (b) neutralizing the corrosion inhibitor into the solution system obtained in step (a), and stirring until the components are fully dissolved after addition; (c) adding a solvent to the solution obtained in step (b) while stirring at a constant speed, and stirring and mixing the mixture thoroughly; (d) Slowly adding organic acid and compound active factor additive to the solution system obtained in step (c) in sequence, stirring for 10 minutes after the addition until the mixture is uniformly mixed, and adjusting the pH value to 5.5 with NaOH solution after standing to obtain the neutral environmentally friendly degreasing and rust removing agent No. 10.

[0044] Furthermore, a method for preparing a degreasing and rust-removing multilayer film using the neutral environmentally friendly degreasing and rust-removing agent comprises the following steps: Pour 30g of neutral environmentally friendly oil and rust remover, 1g of activated carbon and 2g of diatomaceous earth into a beaker, stir evenly, then add 6g of super absorbent resin (polyacrylic acid salt super absorbent resin, PAM) to make the mixture into a paste; put the mixture into a non-woven bag, and stick a layer of non-woven cleaning film containing neutral environmentally friendly oil and rust remover on each side; finally put it into a plastic bag and package it to obtain an oil and rust removal multi-layer film.

[0045] Example 13 This embodiment provides a neutral environmentally friendly degreasing and rust removing agent. The difference between this embodiment and embodiment 5 is only in the raw material components. The raw material components of this embodiment are: Chelating agent sodium citrate, 5 parts by weight; Chelating agent sodium gluconate, 2 parts by weight Hydroxyethylidene diphosphonic acid, 12 parts by weight; Phytic acid, 3 parts by weight; Sulfamic acid, 1 part by weight; Corrosion inhibitor sodium molybdate, 0.25 parts by weight; Corrosion inhibitor zinc acetate, 0.25 parts by weight; Solvent isopropanol, 6 parts by weight; Compound active factor auxiliary agent No. 3, 3 parts by weight; Water, 67.5 parts by weight.

[0046] The preparation method of the neutral environmentally friendly degreasing and rust removing agent is as follows: (a) taking the chelating agent according to the above weight parts, adding it into a stirred tank, and fully dissolving it in water under stirring; (b) adding and corrosion inhibitor to the solution system obtained in step (a), and stirring until the components are fully dissolved; (c) adding a solvent to the solution obtained in step (b) while stirring at a constant speed, and stirring and mixing the mixture thoroughly; (d) Slowly adding the organic acid and the compound active factor additive to the solution system obtained in step (c), stirring for 10 minutes after the addition until the mixture is uniformly mixed, and adjusting the pH value to 6.0 with a NaOH solution after standing to obtain the neutral environmentally friendly degreasing and rust removing agent No. 11.

[0047] Furthermore, a method for preparing a degreasing and rust-removing multilayer film using the neutral environmentally friendly degreasing and rust-removing agent comprises the following steps: Pour 30g of neutral environmentally friendly oil and rust remover, 1g of activated carbon and 2g of diatomaceous earth into a beaker, stir evenly, then add 6g of super absorbent resin (polyacrylic acid salt super absorbent resin, PAM) to make the mixture into a paste; put the mixture into a non-woven bag, and stick a layer of non-woven cleaning film containing neutral environmentally friendly oil and rust remover on each side; finally put it into a plastic bag and package it to obtain an oil and rust removal multi-layer film.

[0048] Experimental Example 1 Take 100g of the neutral environmentally friendly oil-removing and rust-removing agent in Example 5, 100g of commercially available neutral rust-removing agent 1 and 100g of commercially available neutral rust-removing agent 2 in a beaker, soak the rusted sample in the rust-removing agent, take it out after 60 minutes at 25°C, observe and record its surface condition. The mass of the sample before rust removal is m0, and the mass after rust removal is m1. If there is no rust on the surface, it is recorded as the rust of the sample has been completely removed. For samples whose surfaces are not completely removed, dry and weigh them, then soak them in another set of rust-removing liquid, and take them out and weigh them after the rust is completely cleaned, which is m2. Calculate the proportion of the mass of the first rust removal to the total rust removal mass, which is the rust removal rate η(%): Rust removal rate η(%) = (m0-m1) / (m0-m2)×100%.

[0049] The results show that the rust on the test piece has been basically removed after the neutral environmentally friendly degreasing and rust removal agent in Example 5, and the remaining rust area does not exceed 10% (such as Figure 1 ), the rust removal rate η (%) was calculated to be 94.78%; after rust removal with the commercially available neutral rust remover, there was a lot of rust left on the test piece, and the residual rust area was about 30% (such as Figure 1 ), the rust removal rate η(%) was calculated to be 64.27%; after rust removal with the commercially available neutral rust remover, there was a lot of rust residue on the test piece, and the residual rust area was about 57% (such as Figure 1 ), the calculated rust removal rate η (%) = 58.62%. The neutral environmentally friendly degreasing and rust removal agent in Example 5 has a more obvious rust removal effect than the two commercially available rust removal agents.

[0050] Experimental Example 2 Take 100g of the neutral and environmentally friendly degreasing and rust removing agent in Examples 2-13 respectively in a beaker, soak the rusted sample in the rust remover, take it out after 30 minutes at 40°C, observe and record its surface condition. The mass of the sample before rust removal is m0, and the mass after rust removal is m1. If there is no rust on the surface, it is recorded as the rust of the sample has been completely removed. For the samples whose surfaces are not completely cleaned, dry and weigh them, then soak them in another set of rust removal liquid, and take them out and weigh them after the rust is completely cleaned, which is m2. Calculate the proportion of the mass of the first rust removal to the total rust removal mass, which is the rust removal rate η (%). The results are shown in Table 1.

[0051] Table 1 Comparison of oil removal and rust removal rates of different rust removers Group No. Compound active factor additive number Addition amount of compound active factor additives / % Neutral environmentally friendly degreasing and rust removal agent number Rust removal rate η (%) Example 2 / 0 0 76.25 Example 3 1 3% 1 78.48 Example 4 2 3% 2 81.16 Example 5 3 3% 3 98.98 Example 6 4 3% 4 85.20 Example 7 5 3% 5 79.48 Example 8 3 1% 6 83.53 Example 9 3 2% 7 92.52 Example 10 3 4% 8 94.59 Embodiment 11 3 3% 9 96.38 Example 12 3 3% 10 95.21 Example 13 3 3% 11 84.87 As can be seen from Table 1, when the compounding ratio of sophorolipids: polyoxyethylene alkylphenyl ether is 1:1, and the addition ratio of the compound active factor adjuvant is 3%, the rust removal rate of the rust remover is most significant at pH 5.5.

[0052] After the neutral environmentally friendly degreasing and rust removal agent in Example 5 was used for rust removal, the rust on the test piece was basically removed, and the remaining rust area did not exceed 10% (such as Figure 2), the rust removal rate η (%) was calculated to be 98.98%; after the rust remover of Example 2 was used for rust removal, more rust remained on the test piece, and the residual rust area was about 20% (such as Figure 1 ), calculate the rust removal rate η(%) = 76.25%.

[0053] The only difference between the formulas of Example 2 and Example 5 is that the compounded active factor auxiliary agent is not added in Example 2, and the rust removal performance of Example 5 is greatly reduced. It can be seen that the compounded active factor auxiliary agent can well promote the rust removal effect of the environmentally friendly neutral degreasing and rust remover.

[0054] Experimental Example 3 Take the cleaning film of the neutral environmentally friendly degreasing and rust removing agent obtained in Example 5 and stick it on the rusted facade at room temperature. After 1 hour, remove the cleaning film and observe the rust removal of the comparison facade. Figure 3 .

[0055] In summary, the neutral environmentally friendly oil and rust remover of the present invention has a better rust removal effect than similar products, can completely replace conventional neutral rust removers, greatly improves the rust removal rate, and is conducive to the promotion and application of neutral environmentally friendly oil and rust removers.

Claims

1. A neutral environmentally friendly degreasing and rust removing agent, characterized in that: The raw material components include: Chelating agent, 5-20 parts by weight; Organic acid, 5-30 parts by weight; Corrosion inhibitor, 0-8 parts by weight; Solvent, 1-10 parts by weight; Compound active factor auxiliary agent, 0-5 parts by weight.

2. The neutral environmentally friendly degreasing and rust removing agent according to claim 1, characterized in that: The organic acid is one or a combination of hydroxyethylidene diphosphonic acid, phytic acid, aminosulfonic acid, oxalic acid and malic acid.

3. The neutral environmentally friendly degreasing and rust removing agent according to claim 1, characterized in that: The chelating agent is one or a combination of sodium citrate, sodium gluconate, ethylenediaminetetraacetic acid, diethyltriacetic acid, and sodium glutamate diacetate.

4. The neutral environmentally friendly degreasing and rust removing agent according to claim 1, characterized in that: The corrosion inhibitor is one or a combination of sodium molybdate, sodium phytate, hexamethylenetetramine and zinc acetate.

5. The neutral environmentally friendly degreasing and rust removing agent according to claim 1, characterized in that: The solvent is one or a combination of isopropyl alcohol, ethylene glycol, isobutyl alcohol, and propylene glycol butyl ether.

6. The neutral environmentally friendly degreasing and rust removing agent according to claim 1, characterized in that: The compound active factor auxiliary agent is one or a combination of surfactants selected from rhamnolipid, trehalose lipid, sophorolipid, polyoxyethylene alkylphenyl ether and alkyl polysaccharide.

7. The neutral environmentally friendly degreasing and rust removing agent according to claim 6, characterized in that: The compound active factor auxiliary agent is a mixture of sophorolipids and polyoxyethylene alkyl phenyl ether in a mass ratio of 1:2-2:

1.

8. The method for preparing the neutral environmentally friendly degreasing and rust removing agent according to any one of claims 1 to 7, characterized in that: The steps include: (a) taking a chelating agent by weight and dissolving it in water under stirring; (b) adding corrosion inhibitors to the solution system obtained in step (a) in sequence and stirring to fully dissolve; (c) adding a solvent to the solution system obtained in step (b), and stirring and mixing the mixture thoroughly; (d) Slowly adding the organic acid and the compound active factor additive to the solution system obtained in step (c), and continuing stirring for 5-10 minutes. After standing, adjusting the pH value, the neutral environmentally friendly degreasing and rust removing agent is obtained.

9. The method for preparing the neutral environmentally friendly degreasing and rust removing agent according to claim 8, characterized in that: In step (d), after standing, the pH is adjusted to 5-7 with NaOH solution.

10. A method for preparing a multi-layer film for oil removal and rust removal based on the neutral and environmentally friendly oil removal and rust removal agent according to any one of claims 1 to 7, characterized in that: The specific operations are as follows: (1) taking a neutral environmentally friendly degreasing and rust removing agent, activated carbon and diatomaceous earth in a mass ratio of 30:1:2, mixing them thoroughly and evenly, adding a super absorbent resin, and mixing them thoroughly and evenly under stirring to obtain a paste mixture; the mass ratio of the super absorbent resin to the neutral environmentally friendly degreasing and rust removing agent is 1:5; (2) The mixed paste is put into a non-woven bag, and a layer of neutral environmentally friendly oil and rust removal agent non-woven film is applied on both sides to obtain the oil and rust removal multi-layer film.

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