Antirust agent and preparation method thereof

Abstract

The invention discloses a preparation method of a water-based antirust agent, which comprises the following steps: providing initial raw materials including rosin, maleic anhydride, organic polybasic acid and boric acid ester; the preparation method comprises the following steps: mixing rosin and maleic anhydride according to a set proportion, and carrying out diene synthesis reaction at a first set temperature to obtain a first mixed solution; mixing organic polybasic acid and polyol amine borate with the first mixed solution according to a set proportion, and carrying out esterification reaction at a second set temperature to obtain a second mixed solution; and the second mixed solution is diluted, and the antirust agent is obtained. The invention further discloses a water-based antirust agent.

Description

Technical Field

[0001] The present application relates to the field of rust inhibitors, and in particular, to a water-based rust inhibitor and a preparation method thereof. Background Art

[0002] Most of the traditional water-based metal rust inhibitors contain sodium nitrite, but nitrite can be converted into carcinogens, which makes its use and discharge strictly restricted and is gradually being eliminated. The development of environmentally friendly water-based rust inhibitors has become a trend. Although there are some rust inhibitors on the market called environmentally friendly water-based rust inhibitors, they still use mineral oil as the medium. Rust inhibitors using mineral oil as the medium still have many shortcomings, such as: thick oil film, easy to be contaminated by dust, and need to be cleaned before use or assembly, which brings great inconvenience to transportation and use; the cost of using oil for rust prevention is high, the quality is not stable enough, and the waste liquid collection and treatment in the later stage is troublesome, which cannot solve the problem of both rust prevention and environmental protection.

[0003] Therefore, designing and developing a new water-based rust inhibitor to achieve low cost, environmental protection and harmlessness is an urgent problem to be solved in this field. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a water-based rust inhibitor and a preparation method thereof.

[0005] As a first aspect of the present invention, a method for preparing a water-based rust inhibitor is provided, comprising:

[0006] Providing initial raw materials, the initial raw materials comprising: rosin, maleic anhydride, organic polyacid and polyol amine borate;

[0007] Mixing rosin and maleic anhydride in a set ratio, and performing a diene synthesis reaction at a first set temperature to obtain a first mixed solution;

[0008] Mixing the organic polyacid and the polyol amine borate with the first mixed solution in a set ratio, and performing an esterification reaction at a second set temperature to obtain a second mixed solution;

[0009] The second mixed liquid is diluted to obtain the rust inhibitor.

[0010] Furthermore, the initial raw materials satisfy the following relationship in terms of mass fraction:

[0011] W A +W B 15-25 servings;

[0012] W C +W D 25~45 servings,

[0013] Among them, WA Indicates the content of rosin, W B Indicates the content of maleic anhydride, W C Indicates the content of organic polyacid, W D Indicates the content of polyol amine borate.

[0014] Furthermore, the organic polyacid includes sebacic acid and / or lauric acid.

[0015] Further, the polyol amine borate includes diethanolamine borate and / or triethanolamine borate.

[0016] Further, mixing rosin and maleic anhydride in a set ratio and performing a diene synthesis reaction at a first set temperature comprises:

[0017] Add rosin and maleic anhydride into a reaction container in a set ratio, and stir until uniform at the first set temperature, wherein the set ratio is between 1:1.2 and 1:0.8, and the first set temperature is in the range of 150°C to 180°C.

[0018] Further, the organic polyacid and the polyol amine borate are mixed with the first mixed solution in a set ratio, and an esterification reaction is performed at a second set temperature, comprising:

[0019] The organic polyacid and polyol amine borate are added to the reaction container in a set ratio, and stirred at the second set temperature for a set time, wherein the second set temperature is in the range of 70° C. to 80° C.

[0020] Furthermore, the ratio of the organic polyacid to the polyol amine borate is between 3:5 and 9:10.

[0021] Further, diluting the second mixed solution includes:

[0022] Water and isopropanolamine are mixed with the second mixed liquid to obtain an initial rust inhibitor, wherein the pH of the initial rust inhibitor is between 9.0 and 10, and the mass ratio of the water to the isopropanolamine is between 130 and 250.

[0023] Furthermore, diluting the second mixed solution further comprises:

[0024] The bactericide and the defoamer are mixed with the initial rust inhibitor to obtain the rust inhibitor, wherein the mass ratio of the water to the bactericide is between 270 and 420, and the mass ratio of the water to the defoamer is between 200 and 360.

[0025] As a second aspect of the present invention, a water-based rust inhibitor is provided. The water-based rust inhibitor is prepared by the above-mentioned preparation method.

[0026] In the rust inhibitor preparation method provided by the present invention, the rust prevention effect is optimized through the synergistic effect of each component. First, rosin and maleic anhydride are used to undergo a diene synthesis reaction at a specific temperature in a reaction container. The rosin is mainly composed of resin acids, wherein the conjugated double bonds of levorotatory pimaric acid are on the same ring, which is particularly conducive to the diene reaction. The levorotatory pimaric acid in the rosin undergoes diene synthesis with maleic anhydride to generate maleic pimaric anhydride adducts, while other various abietic acid-type resin acids in the rosin are isomerized to levorotatory pimaric acid at a first set temperature, and then undergo an addition reaction with maleic anhydride to obtain adducts.

[0027] The obtained maleopimaric anhydride adduct is a tribasic acid containing a double bond. On the one hand, it contains a polar carboxylic acid group, has a large affinity for metals, is easily adsorbed on the metal surface to form an adsorption wetting film, and the hydrophobic group at the other end is large, so it has a large steric hindrance effect, can isolate ions, oxygen and the like in the external environment from contacting with the metal surface to cause corrosion, and contains an aromatic ring structure and has the characteristics of oil solubility, can be connected with alcohols and esters to form a further protective film, so that the formed protective film has a denser coverage, can effectively resist the infiltration of water molecules, oxygen and other corrosive substances in the medium, and can have a composite synergistic effect on the basis of the original rust prevention. In addition, the maleopimaric anhydride adduct has the characteristics of easy degradation, little pollution, non-toxicity and the like, and is an environmentally friendly rust inhibitor component.

[0028] On the other hand, the anhydride ring of the maleopimaric acid molecule is easy to undergo esterification reaction, and can be condensed with polyols to generate linear polyesters with branches. The obtained first mixed solution is subjected to esterification reaction with organic polyacids and borate esters at a second set temperature, wherein the added organic polyacid can provide a rust-proof function similar to that of maleopimaric anhydride, and polyol amine borate esters can undergo typical esterification reaction with maleopimaric acid and other organic acids in this system. During the reaction, hydrogen ions in the acid molecules undergo electrophilic substitution reaction with alcohol hydroxyl groups in polyol amine borate esters to generate corresponding ester products and water. In order to promote the esterification reaction, it is carried out at the second set temperature and sufficient reactant concentration conditions are provided. The steric hindrance of the carboxyl group in the maleopimaric acid molecule is large, which determines that the bonding of maleopimaric acid ester is difficult to be destroyed, so the synthesized unsaturated polyester has good corrosion resistance and high chemical stability. The generated polyester also has a rigid condensed ring structure with certain hardness and strength. The protective film formed on the metal surface can withstand heavy loads and will not lose its rust prevention ability due to surface damage. At the same time, it also has the ability to resist wear caused by contact between metals. The prepared rust inhibitor liquid has high extreme pressure and wear resistance.

[0029] In addition, organic polyacids can complex with metal atoms or nearby metal ions on the metal surface, adhere to the metal surface to form a layer of insoluble complex protective film, prevent the dissolution of the metal, and play a role in rust prevention. In addition, the presence of carboxyl groups in organic polyacids may make the acid molecules carry a certain charge, thereby affecting the electrochemical properties of the metal surface. By changing the charge distribution on the metal surface, the occurrence of electrochemical corrosion can be reduced.

[0030] In addition, polyol amine borate has good anti-rust performance, but its hydrolysis resistance is poor, which easily leads to the loss of effective ingredients and weakens its anti-rust performance. The polyol amine borate is obtained by forming an NB coordination bond in the borate ester molecule with an external polyol amine. The NB bond formed by the N in the alcohol amine and the B in the boric acid is stable and not easy to react and dissociate, which can greatly improve the hydrolysis stability of the borate. The polyol amine and the borate ester can also form a COB bond. This polyol amine borate is a water-soluble anti-rust inhibitor, which can be well applied to metal parts to achieve an anti-rust effect, and has good dispersion protection, is more environmentally friendly and easy to handle. The above raw materials have a composite synergistic effect to enhance the anti-rust effect.

[0031] The preparation method of the present invention is simple, and the raw materials used are from a wide range of sources, are easy to obtain, and are used in small amounts, and are very suitable for large-scale process production.

[0032] The water-based rust preventive of the present invention does not contain nitrite-based rust preventive ingredients, barium, lead and other substances harmful to the human body, is green and environmentally friendly, and waste liquid does not need to be treated and can be recycled. It not only saves energy but also meets the requirements of environmental protection, and the preparation process is simple and the cost is low. In addition, the water-based metal rust preventive of the present application has good film-forming properties, can adhere to the metal surface, can protect the steel surface from moisture, chemicals, air and its corrosive products, has excellent high and low temperature performance, and good rust prevention.

[0033] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. The best embodiments or means of the present invention will be described in detail in conjunction with the drawings, but they are not intended to limit the technical solutions of the present invention. In addition, there are multiple features, elements, and components that appear in each of the following texts and drawings, and different symbols or numbers are marked for convenience, but they all represent components with the same or similar structures or functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of an implementation method of a method for preparing a solar cell provided by the present invention;

[0035] Figure 2 This is a diagram showing the anti-rust effects of the rust inhibitors of Examples 1 to 3 of the present invention in Test Example 1;

[0036] Figure 3It is a comparison chart of the anti-rust effects of the rust inhibitor of Example 3 of the present invention and a commercially available comparative rust inhibitor. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments based on the embodiments are intended to be used to explain the present application and cannot be understood as limiting the present application.

[0038] References to "one embodiment" or "an example" or "an example" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment itself may be included in at least one embodiment disclosed in the present application. The appearance of the phrase "in one embodiment" in various places in the specification does not necessarily refer to the same embodiment.

[0039] The inventor of the present application has found that metal parts are easily exposed to oxygen, moisture or other corrosive media in the air during production, processing and transportation. If they are not treated with rust prevention, they will rust in a short time. Once rust occurs, it will not only have an adverse effect on the appearance and performance of the finished steel, but also cause severe rust to be scrapped, which will cause huge losses to the national economy. The present invention relates to a water-based rust inhibitor, which is particularly suitable for wet shot blasting dephosphorization equipment and cold-rolled steel plate processing. In the process of physical rust removal on the metal surface of metal coils and plates, especially using wet shot blasting dephosphorization equipment for surface rust removal, it is necessary to perform rust prevention treatment on the steel plates inside the unit and the steel sand or steel shots in the treatment liquid to ensure that the surface of the shot is wrapped by the rust inhibitor, improve its fluidity in the treatment liquid, and prevent agglomeration. At the same time, the rust inhibitor forms a natural protective film on the surface of the steel plate after wet shot blasting treatment, which can inhibit corrosion caused by moisture and many other chemical components, and the rust prevention period can be as long as 6 to 12 months.

[0040] However, most of the water-based metal rust preventives used in the past contain sodium nitrite. This type of water-based rust preventive has obvious advantages such as low price, good effect, easy use and easy removal, so it is widely used. However, it has been proven that nitrite can be converted into carcinogens, which has strictly restricted its use and discharge, and is gradually being eliminated. With the increasing attention paid to environmental protection issues, the research on environmentally friendly water-based rust preventives has received widespread attention at home and abroad, especially the development of long-lasting water-based rust preventives has become a trend. Although there are some rust preventives on the market called environmentally friendly water-based rust preventives, mineral oil is still used as the medium. Rust preventives using mineral oil as a medium still have many shortcomings, such as: thick oil film, easy to be contaminated by dust, and need to be cleaned before use or assembly, which brings great inconvenience to transportation and use; the cost of using oil for rust prevention is high, the quality is not stable enough, and the cost and difficulty of later waste liquid treatment are high, which is not conducive to the promotion and use of users, and cannot solve the problem of both rust prevention and environmental protection. Therefore, it is of great significance to study a more economical, environmentally friendly, and harmless rust preventive.

[0041] In view of this, research and development of water-based metal rust inhibitors with good rust resistance, stable properties, low price, reduced pollution, complete functions and convenient use should be the direction of future efforts of scientific researchers. The purpose of the present invention is to provide a green and environmentally friendly water-based rust inhibitor and its preparation method. In order to overcome the shortcomings of the current water-soluble rust inhibitors, such as poor rust prevention effect, containing toxic substances such as nitrite, high cost and serious pollution, the process of the present invention successfully developed a production process of a green and environmentally friendly water-based rust inhibitor with rosin, maleic anhydride, pure water, organic amine, organic boric acid ester, bactericide, defoamer and the like as main raw materials. It is mainly based on synthetic antirust monomers, which are dissolved in water, and then synergistic bactericides and defoamers are added to form a uniform, transparent, non-stratified, non-precipitated liquid, which has excellent rust resistance and is particularly suitable for the treatment liquid of wet shot blasting dephosphorization equipment.

[0042] As a first aspect of the present invention, a method for preparing a water-based rust inhibitor is provided, such as Figure 1 As shown, including:

[0043] S100, providing initial raw materials, wherein the initial raw materials include: rosin, maleic anhydride, organic polyacid and boric acid ester;

[0044] S110, mixing rosin and maleic anhydride in a set ratio, and performing a diene synthesis reaction at a first set temperature to obtain a first mixed solution;

[0045] S120, mixing an organic polyacid and a boric acid ester with the first mixed solution in a set ratio, and performing an esterification reaction at a second set temperature to obtain a second mixed solution;

[0046] S130, diluting the second mixed solution to obtain the rust inhibitor.

[0047] In step S100, the present invention does not specifically limit the way to obtain the provided initial raw materials, which can be purchased or prepared. In order to facilitate the preparation of the rust inhibitor, the initial raw materials are weighed according to a set ratio, and then added in a set order to prepare the rust inhibitor. In order to make the rust inhibitor achieve the best rust-proof effect, and the provided raw materials can maximize the rust-proof effect and reduce the residual by-products of the chemical reaction during the preparation, preferably, the initial raw materials satisfy the following relationship in terms of mass:

[0048] W A +W B 15-25 servings;

[0049] W C +W D 25~45 servings,

[0050] Among them, W A Indicates the content of rosin, W B Indicates the content of maleic anhydride, W C Indicates the content of organic polyacid, W D Indicates the content of polyol amine borate.

[0051] In step S110, in the rust inhibitor preparation method provided by the present invention, the rust prevention effect is optimized through the synergistic effect of each component. First, rosin and maleic anhydride are used to undergo a diene synthesis reaction at a specific temperature in a reaction container. The rosin is mainly composed of resin acids, wherein the conjugated double bonds of levorotatory pimaric acid are on the same ring, which is particularly conducive to the diene reaction. The levorotatory pimaric acid in the rosin undergoes diene synthesis with maleic anhydride to generate maleic pimaric anhydride adducts, while other various abietic acid-type resin acids in the rosin are isomerized to levorotatory pimaric acid at a first set temperature, and then react with maleic anhydride to obtain adducts.

[0052] The obtained maleopimaric anhydride adduct is a tribasic acid containing a double bond. On the one hand, it contains a polar carboxylic acid group, has a large affinity for metals, is easily adsorbed on the metal surface to form an adsorption wetting film, and the hydrophobic group at the other end is large, so it has a large steric hindrance effect, can isolate ions, oxygen and the like in the external environment from contacting with the metal surface to cause corrosion, and contains an aromatic ring structure and has the characteristics of oil solubility, can be connected with alcohols and esters to form a further protective film, so that the formed protective film has a denser coverage, can effectively resist the infiltration of water molecules, oxygen and other corrosive substances in the medium, and can have a composite synergistic effect on the basis of the original rust prevention. In addition, the maleopimaric anhydride adduct has the characteristics of easy degradation, little pollution, non-toxicity and the like, and is an environmentally friendly rust inhibitor component. In order to improve the diene synthesis reaction activity and the yield of maleopimaric acid, preferably, rosin and maleic anhydride are added to the reaction vessel in a set ratio and stirred at the first set temperature until uniform, wherein the set ratio is between 1:1.2 and 1:0.8, and the first set temperature is in the range of 150°C to 180°C. Under this condition, the obtained first mixed solution includes more than 50% of maleopimaric anhydride adduct, about 35% of unreacted resin acid and 10% of neutral substances. The uniformity is judged by observing the appearance, color and turbidity of the liquid. If the liquid has uniform color and no visible suspended matter or particles, it can be considered that its uniformity is high and the reaction is relatively sufficient.

[0053] In step S120, the anhydride ring of the maleopimaric acid molecule is easy to undergo esterification reaction, and can be condensed with polyols to generate linear polyesters with branches. The obtained first mixed solution is subjected to esterification reaction with organic polyacids and borate esters at a second set temperature, wherein the added organic polyacid can provide a rust-proof function similar to that of maleopimaric anhydride, and polyol amine borate esters can undergo typical esterification reaction with maleopimaric acid and other organic acids in this system. During the reaction, hydrogen ions in the acid molecules undergo electrophilic substitution reaction with alcohol hydroxyl groups in polyol amine borate esters to generate corresponding ester products and water. In order to promote the esterification reaction, it is carried out at the second set temperature and sufficient reactant concentration conditions are provided. The steric hindrance of the carboxyl group in the maleopimaric acid molecule is large, which determines that the bonding of maleopimaric acid ester is difficult to be destroyed, so the synthesized unsaturated polyester has good corrosion resistance and high chemical stability. The generated polyester also has a rigid condensed ring structure with certain hardness and strength. The protective film formed on the metal surface can withstand heavy loads and will not lose its rust prevention ability due to surface damage. At the same time, it also has the ability to resist wear caused by contact between metals. The prepared rust inhibitor liquid has high extreme pressure and wear resistance.

[0054] As an optional implementation, the organic polyacid and the polyol amine borate are added to the reaction container in a set ratio, and stirred at the second set temperature for a set time, wherein the second set temperature is in the range of 70° C. to 80° C. In order to improve the reaction activity, reduce the content of unwanted by-products in the chemical reaction, and reduce costs, preferably, the ratio of the organic polyacid to the polyol amine borate is between 3:5 and 9:10.

[0055] In addition, organic polyacids can be complexed with metal atoms or nearby metal ions on the metal surface, attached to the metal surface to form a layer of insoluble complex protective film, prevent the dissolution of the metal, and play a rust-proof role. In addition, the presence of carboxyl groups in organic polyacids may cause the acid molecules to have a certain charge, thereby affecting the electrochemical properties of the metal surface. By changing the charge distribution on the metal surface, the occurrence of electrochemical corrosion can be reduced. In order to improve the rust-proof effect, reactivity and water solubility of organic polyacids, preferably, the organic polyacids include sebacic acid and lauric acid. Sebacic acid and lauric acid are both dicarboxylic acids, which can react with maleic rosin to further increase the diversity and functionality of the product. These carboxylic acids can react with the hydroxyl or maleic anhydride in rosin to form ester compounds, which have good rust-proof effects.

[0056] In addition, polyol amine borate has good rust-proof performance, but its hydrolysis resistance is poor, which easily leads to the loss of effective ingredients and weakens its rust-proof performance. The polyol amine borate is obtained by forming NB coordination bonds in the borate ester molecule with an external polyol amine. The NB bond formed by the N in the alcohol amine and the B in the boric acid is stable, not easy to react and dissociate, and can greatly improve the hydrolysis stability of the borate. The polyol amine and the borate can also form a COB bond. This polyol amine borate is a water-soluble rust inhibitor, which can be well applied to metal parts to play an anti-rust effect, and has good dispersion protection, is more environmentally friendly and easy to handle. There is a composite synergistic effect between the above-mentioned raw materials to enhance the anti-rust effect. In order to improve the anti-rust effect, reaction activity and water solubility of the polyol amine borate, as preferably, the polyol amine borate includes diethanolamine borate and / or triethanolamine borate.

[0057] In step S130, diluting the second mixed solution includes:

[0058] Water and isopropanolamine are mixed with the second mixed liquid to obtain an initial rust inhibitor, wherein the pH of the initial rust inhibitor is between 9.0 and 10, and the mass ratio of the water to the isopropanolamine is between 130 and 250; a bactericide and a defoamer are mixed with the initial rust inhibitor to obtain the rust inhibitor, wherein the mass ratio of the water to the bactericide is between 270 and 420, and the mass ratio of the water to the defoamer is between 200 and 360.

[0059] As the main component of rust inhibitors, water can dilute other ingredients in rust inhibitors, making them easier to apply to metal surfaces. Using water as a base material can reduce the cost of rust inhibitors because water is an economical and easily accessible resource. Water-based rust inhibitors are more environmentally friendly than oil-based rust inhibitors because they are easy to handle and biodegrade. Isopropanolamine is surface active and can be used as a surfactant in rust inhibitors to help rust inhibitors better disperse and adsorb on metal surfaces. The aqueous solution of isopropanolamine is alkaline, which helps neutralize acidic substances on the metal surface and reduce the possibility of corrosion. The nitrogen and oxygen atoms in isopropanolamine have lone pairs of electrons, which can form complexes with the metal surface, preventing oxygen and water molecules from contacting the metal, thereby achieving an anti-rust effect. Monoisopropanolamine can increase the viscosity of the rust inhibitor, prevent the rust inhibitor from escaping from the metal surface, and make it firmly adhere to the metal surface. Compared with other organic amine compounds, isopropanolamine is less toxic and has less impact on the environment.

[0060] Bactericides prevent the rust inhibitor working fluid from corruption and inhibit the growth of bacteria. Adding defoamers can ensure the anti-rust effect on the one hand. Foam may affect the uniform distribution of the rust inhibitor on the metal surface, thereby affecting the anti-rust effect. Defoamers can eliminate foam and ensure that the rust inhibitor can evenly cover the metal surface. Secondly, defoamers can improve production efficiency. In industrial production, the generation of foam may interfere with the production process. For example, in the process of coating and printing, foam will affect the uniformity of the coating. The use of defoamers can reduce this interference and improve production efficiency. In addition, defoamers reduce resource waste. Foam may cause liquid to overflow or splash, resulting in waste of resources. Defoamers can reduce foam, thereby reducing liquid loss. And defoamers can improve the appearance of products. In some applications, such as packaging or storage, foam may affect the appearance of rust inhibitors. The use of defoamers can improve the appearance of rust inhibitors and improve the market competitiveness of rust inhibitors.

[0061] In some embodiments, in order to stabilize the prepared rust inhibitor, improve the purity and recovery rate of the rust inhibitor, and also contribute to safety and convenience of operation, the prepared rust inhibitor is left to stand for a certain period of time and sealed for preservation. Insoluble solids may be produced after the rust inhibitor, and standing can make these solids settle to the bottom of the container, which is convenient for subsequent separation and purification. If the rust inhibitor produces liquids of different densities, standing can help them to separate, which is convenient for subsequent liquid separation operations. In some cases, the rust inhibitor may produce an emulsion, and standing helps to reduce the emulsification phenomenon and make the liquid easier to separate. Secondly, the rust inhibitor may produce gas, and standing can allow bubbles to escape and reduce the gas content in the liquid. In addition, the rust inhibitor just prepared may be supersaturated, and standing helps to reduce supersaturation and prevent the product from crystallizing in an inappropriate place. In addition, after some exothermic or violent chemical reactions, standing can ensure that the internal reaction of the rust inhibitor has been completely stopped, chemically stable, and reduce safety risks. The stirring in the reaction in the present invention may introduce impurities into the rust inhibitor or affect certain sensitive reactions, and standing can avoid these problems.

[0062] A specific embodiment of the method for preparing the rust inhibitor of the present invention includes:

[0063] Providing initial raw materials, wherein the initial raw materials are counted according to the following mass parts: the total mass parts of rosin and acid anhydride are 15 to 25 parts; the total mass parts of sebacic acid, lauric acid, and triethanolamine borate are 25 to 45 parts; the monoisopropanolamine is 1.2 to 2.5 parts; the bactericide is 0.8 to 2 parts; and the defoamer is 0.6 to 1.8 parts;

[0064] Add rosin and maleic anhydride to the esterification reaction kettle, and when the temperature reaches about 160℃~170℃, fully react to obtain the first mixed liquid. Under this temperature condition, slowly stir the first mixed liquid for 2~4 hours until the reaction is uniform; slowly add sebacic acid, lauric acid, and triethanolamine borate while stirring, heat the mixture to control the temperature within the range of 70~80℃, and fully react for 1~2.5 hours to obtain the second mixed liquid, the ratio of sebacic acid, lauric acid and triethanolamine borate mixture is (2~3):(4~6):10;

[0065] Add 500 kg of pure water and monoisopropanolamine to the second mixed solution, stir evenly, so that the rust inhibitor can be evenly dissolved in the water, and the pH value of the mixed solution is stabilized in the range of 9.0 to 10, wherein the pure water is filtered water with a filter element accuracy of 20 nanometers and a conductivity of less than 30 us / cm;

[0066] Add the bactericide and defoamer in sequence while stirring, and continue stirring for 0.5 to 2 hours to make the mixed solution completely mixed. The defoamer is ethylene oxide and propylene oxide, and the best mass ratio is 2:3;

[0067] The stirred mixture is allowed to stand at room temperature for 4 to 6 hours to obtain a light yellow transparent uniform liquid, i.e., a water-based rust preventive. The water-based rust preventive after standing is sealed and stored away from light.

[0068] As a second aspect of the present invention, a water-based rust inhibitor is provided. The water-based rust inhibitor is prepared by the above-mentioned preparation method.

[0069] The environmentally friendly water-based rust preventive of the present invention has good rust resistance and has a longer rust resistance time in a humid environment. The environmentally friendly water-based rust preventive of the present invention is easy to store and does not need to be cleaned when used. The environmentally friendly water-based rust preventive product of the present invention is a weakly alkaline rust preventive, does not contain compounds such as sodium nitrite, lead, barium, etc., does not contain substances harmful to the human body and the environment, has no adverse side effects on the environment and humans, and the product is environmentally friendly. The raw material rosin used for the water-based rust preventive of the present invention is abundant in resources and low in price. The rust preventive synthesized by modifying rosin is non-toxic and harmless, has good rust resistance, and is easily biodegradable. The environmentally friendly water-based rust preventive of the present invention has a large affinity for metals, is firmly adsorbed on the metal surface, forms a directional adsorption layer, and forms a uniform, firm, clean, beautiful and oil-free and white spot-free hydrophobic protective film on the metal surface, effectively repels water and oil stains, and the surface of the metal parts treated with the rust preventive is clean and free of oil stain residues, and can be directly used for assembly or packaging. The environmentally friendly water-based rust preventive of the present invention is particularly suitable for wet shot blasting dephosphorization systems, has better fluidity (lubricity) for steel sand, can fully wrap steel sand, and has better cleaning properties for impurities attached to the surface of steel plates, and forms a uniform film on the surface of steel plates. The initial operating temperature of the rust preventive is lower than that of other similar products, has less foam, and has a significant defoaming effect. The rust preventive of the present invention is easy to use, safe, environmentally friendly, non-toxic, and economical (the use concentration is 2% to 5%), and the method of use is simple, and it can be used by spraying or soaking, and can significantly improve the work efficiency of the parts rust prevention process.

[0070] The present invention will be further explained below in conjunction with the embodiments.

[0071] Example

[0072] Example 1

[0073] Provided is a method for preparing a rust inhibitor, comprising:

[0074] Initial raw materials are provided, wherein the raw materials are prepared according to the following mass parts: the total mass parts of rosin and acid anhydride are 15 parts; the total mass parts of sebacic acid, lauric acid, and triethanolamine borate are 25 parts; monoisopropanolamine is 1.2 parts; the bactericide is 0.8 parts; and the defoamer is 0.6 parts.

[0075] The rosin and maleic anhydride are mixed and added to an esterification reaction kettle with a first set temperature of 160°C to carry out a chemical reaction. Under this temperature condition, the mixed liquid is slowly stirred for 2 hours until the reaction is uniform; while stirring, sebacic acid, lauric acid, and triethanolamine borate are slowly added in a ratio of 2:4:10, and the reaction kettle is heated to a second set temperature of 70°C, and the reaction is fully reacted for 1 hour to obtain a mixed liquid.

[0076] Add 500 kg of pure water and 2.5 kg of monoisopropanolamine to the mixed solution, stir evenly, so that the rust inhibitor can be evenly dissolved in the water, and the pH value of the mixed solution is stabilized in the range of 9.0-10;

[0077] Add 1.2 kg of fungicide and 1.4 kg of defoamer to the mixture in sequence while stirring, and continue stirring for 0.5 h to ensure that the mixture is completely mixed.

[0078] The stirred mixed liquid was allowed to stand at room temperature for 4 hours to obtain a brown-yellow transparent uniform liquid. The prepared rust inhibitor product is Product A.

[0079] Example 2

[0080] The rust inhibitor was prepared by the same preparation method as in Example 1, except that:

[0081] In the step of providing the initial raw materials, the raw materials are prepared according to the following mass parts: the total mass parts of rosin and acid anhydride are 20 parts; the total mass parts of sebacic acid, lauric acid, and triethanolamine borate are 35 parts; monoisopropanolamine is 2 parts; the bactericide is 1.5 parts; and the defoamer is 1 part.

[0082] The mixed components of rosin and maleic anhydride are added to an esterification reaction kettle with a first set temperature of 165°C to carry out a chemical reaction. Under this temperature condition, the mixed liquid is slowly stirred for 3 hours until the reaction is uniform; while stirring, sebacic acid, lauric acid, and triethanolamine borate are slowly added in a ratio of 2:6:10, and the reaction kettle is heated to a second set temperature of 75°C, and the reaction is fully reacted for 2 hours to obtain a mixed liquid;

[0083] Add 500 kg of pure water and 3 kg of monoisopropanolamine to the mixed solution, stir evenly, so that the rust inhibitor can be evenly dissolved in the water, and the pH value of the mixed solution is stabilized in the range of 9.0-10;

[0084] While stirring, add 1.6 kg of fungicide and 1.8 kg of defoamer to the mixture in sequence, and continue stirring for 1 hour to ensure that the mixture is completely mixed.

[0085] The stirred mixed liquid was allowed to stand at room temperature for 5 hours to obtain a light yellow transparent uniform liquid. The prepared rust inhibitor product was Product B.

[0086] Example 3

[0087] The rust inhibitor was prepared by the same preparation method as in Example 1, except that:

[0088] In the step of providing the initial raw materials, the raw materials are prepared according to the following mass parts: the total mass parts of rosin and acid anhydride are 25 parts; the total mass parts of sebacic acid, lauric acid, and triethanolamine borate are 45 parts; monoisopropanolamine is 2.5 parts; the bactericide is 2 parts; and the defoamer is 1.8 parts.

[0089] Add rosin and maleic anhydride to an esterification reaction kettle with a first set temperature of 170°C to carry out a chemical reaction. Under this temperature condition, slowly stir the mixed liquid for 4 hours until the reaction is uniform; slowly add sebacic acid, lauric acid, and triethanolamine borate while stirring, with a ratio of 3:6:10, and heat the reaction kettle to a second set temperature of 80°C, and fully react for 2.5 hours to obtain a mixed liquid;

[0090] Add 500 kg of pure water and 3.8 kg of monoisopropanolamine to the mixed solution, stir evenly, so that the rust inhibitor can be evenly dissolved in the water, and the pH value of the mixed solution is stabilized in the range of 9.0-10;

[0091] Add 1.8 kg of fungicide and 2.5 kg of defoamer to the mixture in sequence while stirring, and continue stirring for 2 hours to ensure that the mixture is completely mixed.

[0092] The stirred mixed liquid was allowed to stand at room temperature for 6 hours to obtain a light yellow transparent uniform liquid. The prepared rust inhibitor product was Product C.

[0093] Test Example 1

[0094] The environmentally friendly water-based rust inhibitors prepared in Examples 1 to 3 were tested for performance according to the following experimental method, and the testing method includes:

[0095] The high temperature stability of the three rust inhibitor samples in a constant temperature water bath at 60±2℃ was observed by visual inspection. Specifically, three steel test plates of the same size and made of Q235B material were soaked in the three rust inhibitor samples of products A, B and C for 5 minutes respectively. After being taken out, the excess liquid on the surface of the plates was absorbed with filter paper. The plates were all hung vertically in a ventilated environment with a humidity of (90±2)%, a temperature of 35±2℃, and the appearance changes of the three test plates were recorded to evaluate the rust resistance of the corresponding water-based rust inhibitor.

[0096] The performance indicators of various water-based rust inhibitors are shown in Table 1.

[0097] Table 1

[0098]

[0099] Anti-rust effect comparison chart Figure 2 As shown in Table 1 and Figure 2 It can be seen from the test results that the water-based rust inhibitor product C provided by the present invention has the best rust prevention effect and the best stability, and the first rust spot did not appear on the surface of the hanging piece until the 15th day.

[0100] Test Example 2

[0101] In order to test the anti-rust effect and cost-effectiveness of the water-based rust inhibitor of the present invention and a commercially available imported brand of rust inhibitor, three steel sheets of the same Q235B material were taken as test plates, and the rust inhibitor product C prepared by the present invention was used as the test sample. Among them, two test plates were respectively immersed in the rust inhibitor sample C prepared in Example 3 of the present invention and a commercially available imported brand of rust inhibitor, and the immersion time was 5 minutes. The last test plate was not subjected to rust prevention treatment. The three steel sheet test plates were placed under the same temperature, humidity, and ventilation environment, and observed and recorded every day. The comparison diagram of the anti-rust conditions of the three steel plates is shown in the figure below. Figure 3 As shown, after 3 months of storage, it was found that the water-based protective film on the surface of the sample soaked in the water-based rust inhibitor product C prepared by the present invention was stable and had no rust erosion; the sample soaked in a commercially available imported brand of rust inhibitor had slight rust on the surface; and the test plate without any treatment was very seriously rusted.

[0102] Test Example 3

[0103] The foam performance test of the water-based rust inhibitor of Example 3 of the present invention was carried out to test its effect of being used in the treatment liquid of the wet shot blasting dephosphorization device, specifically including:

[0104] Pour the prepared rust inhibitor into a 100ml stoppered measuring cylinder, add until the scale reaches 50ml, and add a certain amount of steel sand with diamond edges for wet shot blasting and phosphorus removal; put the temperature agent into the measuring cylinder, and when the diluent temperature is heated to 32℃, take out the temperature agent and plug the measuring cylinder with a stopper; hold the stoppered measuring cylinder with your right hand, press the stopper, and shake the stoppered measuring cylinder up and down while starting the stopwatch. The shaking time is 1min, and the number of shaking times is 100 to 150 times; when the shaking is over, put the stoppered measuring cylinder on the test bench and immediately restart the timing. The timing ends when the foam disappears, and the timing shows that the foam disappears within 15s.

[0105] According to the test results, the rust inhibitor has better fluidity (lubricity) for steel grit, can fully wrap the steel grit, and has better cleaning properties for impurities attached to the surface of the steel plate, forming a uniform film on the surface of the steel grit and the steel plate. The initial operating temperature of the rust inhibitor is lower than that of other similar products, with less foam and obvious defoaming effect.

[0106] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A method for preparing a water-based rust inhibitor, characterized in that: include: Providing initial raw materials, the initial raw materials comprising: rosin, maleic anhydride, organic polyacid and polyol amine borate; Mixing rosin and maleic anhydride in a set ratio, and performing a diene synthesis reaction at a first set temperature to obtain a first mixed solution; Mixing the organic polyacid and the polyol amine borate with the first mixed solution in a set ratio, and performing an esterification reaction at a second set temperature to obtain a second mixed solution; The second mixed liquid is diluted to obtain the rust inhibitor.

2. The preparation method according to claim 1, characterized in that: The initial raw materials satisfy the following relationship in terms of mass fractions: W A +W B 15-25 servings; W C +W D 25~45 servings, Among them, W A Indicates the content of rosin, W B Indicates the content of maleic anhydride, W C Indicates the content of organic polyacid, W D Indicates the content of polyol amine borate.

3. The preparation method according to claim 2, characterized in that: The organic polyacid includes sebacic acid and / or lauric acid.

4. The preparation method according to claim 2, characterized in that: The polyol amine borate includes diethanolamine borate and / or triethanolamine borate.

5. The preparation method according to claim 1, characterized in that: Mixing rosin and maleic anhydride in a set ratio and performing a diene synthesis reaction at a first set temperature comprises: Add rosin and maleic anhydride into a reaction container in a set ratio, and stir until uniform at the first set temperature, wherein the set ratio is between 1:1.2 and 1:0.8, and the first set temperature is in the range of 150°C to 180°C.

6. The preparation method according to claim 5, characterized in that: Mixing the organic polyacid and the polyol amine borate with the first mixed solution in a set ratio, and performing an esterification reaction at a second set temperature comprises: The organic polyacid and polyol amine borate are added to the reaction container in a set ratio, and stirred at the second set temperature for a set time, wherein the second set temperature is in the range of 70° C. to 80° C.

7. The preparation method according to claim 6, characterized in that: The ratio of the organic polyacid to the polyol amine borate is between 3:5 and 9:

10.

8. The preparation method according to any one of claims 1 to 7, characterized in that: The diluting process of the second mixed solution comprises: Water and isopropanolamine are mixed with the second mixed liquid to obtain an initial rust inhibitor, wherein the pH of the initial rust inhibitor is between 9.0 and 10, and the mass ratio of the water to the isopropanolamine is between 130 and 250.

9. The preparation method according to claim 8, characterized in that: The step of diluting the second mixed solution further comprises: The bactericide and the defoamer are mixed with the initial rust inhibitor to obtain the rust inhibitor, wherein the mass ratio of the water to the bactericide is between 270 and 420, and the mass ratio of the water to the defoamer is between 200 and 360.

10. A water-based rust inhibitor, characterized in that: The water-based rust inhibitor is prepared by any one of the preparation methods in claims 1 to 9 above.

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