Efficient and stable nano SiO2-Al2O3 compound water-based antirust agent and preparation method thereof

Abstract

The invention discloses an efficient and stable nano SiO2-Al2O3 compound water-based antirust agent and a preparation method thereof, and the compound water-based antirust agent comprises the following components in parts by mass: 10 to 20 parts of nano silicon dioxide, 5 to 10 parts of nano aluminum oxide, 3.0 to 8.0 parts of a compound dispersing aid, 1.0 to 3.0 parts of a compound auxiliary antirust agent, 1.0 to 3.0 parts of a compound surfactant, 1.0 to 4.0 parts of a compound pH regulator and 1.0 to 3.0 parts of a compound defoaming agent, 1.0 to 3.0 parts of a compound bactericide and 55 to 75 parts of deionized water. The antirust agent not only has excellent antirust and stable performance, but also has the advantages of being environment-friendly, non-toxic, easy to prepare and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of metal rust prevention, and particularly relates to a highly efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor and a preparation method thereof. Background Art

[0002] Traditional methods for rust prevention of metal surfaces primarily include coatings, electrochemical protection, and alloying. While these methods can inhibit corrosion to a certain extent, their effectiveness is often difficult to guarantee under complex and changing environmental conditions or during long-term use. In recent years, with the rapid development of nanotechnology, the application of nanomaterials in metal rust prevention has gradually attracted widespread attention. Nanomaterials possess unique physicochemical properties, such as high specific surface area, high activity, excellent dispersibility, and stability. These properties enable them to form a dense protective film on metal surfaces, effectively blocking the attack of water, oxygen, and other corrosive media, thereby improving the metal's corrosion resistance. Among them, nano-silicon dioxide (SiO2) and nano-alumina (Al2O3) have attracted considerable attention due to their excellent properties. Nano-silicon dioxide has excellent chemical and thermal stability, forming a dense siloxane network on metal surfaces, effectively inhibiting corrosion. Nano-alumina, on the other hand, possesses high hardness, a high melting point, and high chemical stability, enabling it to maintain a stable rust prevention effect in harsh environments such as high temperature and high pressure. Therefore, by compounding nano-silicon dioxide and nano-aluminum oxide, the synergistic effect of the two nanoparticles in the anti-rust effect can be achieved, thereby improving the anti-rust performance of the rust inhibitor. Summary of the Invention

[0003] By optimizing the ratio of nano-silica and nano-alumina, improving the preparation process, and adding appropriate additives, the present invention successfully prepares a water-based nano-rust inhibitor based on a combination of nano-silica and nano-alumina. This solves the problem of poor rust prevention effectiveness of existing rust inhibitors. The rust inhibitor not only has excellent rust prevention properties but also offers advantages such as being environmentally friendly, non-toxic, easy to prepare, and convenient to use, effectively preventing rust on metal surfaces.

[0004] In order to achieve the above-mentioned purpose of the invention, the present invention provides a high-efficiency and stable nano-SiO2-Al2O3 compound water-based rust inhibitor, which includes the following components in parts by mass: 10 to 20 parts of nano-silicon dioxide, 5 to 10 parts of nano-alumina, 3.0 to 8.0 parts of compound dispersing aid, 1.0 to 3.0 parts of compound auxiliary rust inhibitor, 1.0 to 3.0 parts of compound surfactant, 1.0 to 4.0 parts of compound pH regulator, 1.0 to 3.0 parts of compound defoaming agent, 1.0 to 3.0 parts of compound bactericide, and 55 to 75 parts of deionized water.

[0005] In the above technical solution, further, the particle size of the nano-silicon dioxide and nano-aluminum oxide is controlled to be 30 to 50 nm to ensure that they have the characteristics of nano-materials, so that they have a high specific surface area and excellent physical and chemical properties.

[0006] Furthermore, the compound dispersing aid is prepared by mixing, by weight, 60% to 70% sodium polyacrylate and 30% to 40% polyvinyl pyrrolidone; the compound surfactant is prepared by mixing, by weight, 70% to 80% sodium lauryl sulfate (SDS) and 20% to 30% fatty alcohol polyoxyethylene ether (AEO). This rust inhibitor, with nano-silica and nano-alumina as its core components, significantly enhances its rust-preventing properties through the properties of nanoparticles. By adding appropriate amounts of the compound dispersing aid and compound surfactant, the water-based nano-rust inhibitor maintains excellent dispersibility and stability in a variety of application environments.

[0007] The compound auxiliary rust inhibitor is prepared by mixing 40% to 50% benzotriazole (BTA), 30% to 40% decanoic acid, and 20% to 30% dodecenylsuccinic acid by weight. The compound auxiliary rust inhibitor can form a dense protective film on the metal surface, effectively isolating oxygen and moisture.

[0008] The compounded pH regulator is prepared by mixing 40% to 60% citric acid and 40% to 60% disodium hydrogen phosphate by weight. By adding an appropriate amount of the compounded pH regulator, the pH value of the rust inhibitor is stably controlled within the range of 6 to 7. The compounded pH regulator can also ensure good compatibility between the nano water-based rust inhibitor and the surface of metal materials.

[0009] The compound defoamer is prepared by mixing 80% to 90% of an organosilicon defoamer and 10% to 20% of a polyether defoamer by weight. The compound fungicide is prepared by mixing 25% to 35% of glutaraldehyde, 30% to 40% of triclosan, 20% to 30% of isothiazolinone, and 15% to 25% of phenoxyethanol by weight. The added compound fungicide can effectively kill or inhibit the growth of microorganisms, protecting the rust inhibitor from microbial contamination.

[0010] A method for preparing the above-mentioned efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor, the preparation method comprising the following steps:

[0011] ① First, add 55-75 parts of deionized water into the reactor and heat it to 50℃-60℃, add nano-silica and nano-alumina into the reactor, turn on the agitator at the same time, control the stirring speed at 300-500 rpm, and continue stirring for 30-45 minutes.

[0012] ② Add the compound dispersing aid to the above solution, increase the stirring speed to 500-700 rpm, and stir for 15-25 minutes.

[0013] ③Add the compound surfactant and the compound auxiliary rust inhibitor into the reactor in sequence, maintain the stirring speed at 500-700 rpm, and the stirring time is 30-45 minutes.

[0014] ④ Reduce the stirring speed to 200-400 rpm, and slowly drip the compound pH regulator into the reactor until the pH value stabilizes in the range of 6-7.

[0015] ⑤ Add the compound defoamer into the reactor, maintain the stirring speed at 200-400 rpm, and continue stirring for 5-10 minutes.

[0016] ⑥ Finally, add the compound fungicide into the reactor, increase the stirring speed to 400-600 rpm, and continue stirring for 5-10 minutes.

[0017] ⑦ After all the above components are added, increase the stirring speed to 800-1000 rpm and stir for 45-60 minutes until the water-based rust inhibitor cools to room temperature to obtain a highly efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The highly effective and stable nano-SiO2-Al2O3 composite water-based rust inhibitor provided by the present invention utilizes nanotechnology and environmentally friendly additives to significantly enhance rust prevention effectiveness. The preparation method is simple and easy, meeting environmental requirements. The rust inhibitor forms a dense protective film on metal surfaces, effectively insulating them from the external environment and extending the rust protection period. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to specific examples, but the present invention is not limited in any way. To avoid redundancy, the raw materials in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.

[0021] The invention discloses a highly efficient and stable nano-SiO2-Al2O3 compound water-based rust inhibitor, which comprises the following components in parts by mass: 10-20 parts of nano-silicon dioxide, 5-10 parts of nano-alumina, 3.0-8.0 parts of a compound dispersing aid, 1.0-3.0 parts of a compound auxiliary rust inhibitor, 1.0-3.0 parts of a compound surfactant, 1.0-4.0 parts of a compound pH regulator, 1.0-3.0 parts of a compound defoaming agent, 1.0-3.0 parts of a compound bactericide, and 55-75 parts of deionized water.

[0022] A method for preparing the above-mentioned efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor, the preparation method comprising the following steps:

[0023] ① First, add 55-75 parts of deionized water into the reactor and heat it to 50℃-60℃, add nano-silica and nano-alumina into the reactor, turn on the agitator at the same time, control the stirring speed at 300-500 rpm, and continue stirring for 30-45 minutes.

[0024] ② Add the compound dispersing aid to the above solution, increase the stirring speed to 500-700 rpm, and stir for 15-25 minutes.

[0025] ③ Add the compounded surfactant and the compounded auxiliary rust inhibitor into the reactor in sequence, maintain the stirring speed at 500-700 rpm, and stir for 30-45 minutes.

[0026] ④ Reduce the stirring speed to 200-400 rpm, and slowly drip the compound pH regulator into the reactor until the pH value stabilizes in the range of 6-7.

[0027] ⑤ Add the compound defoamer into the reactor, maintain the stirring speed at 200-400 rpm, and continue stirring for 5-10 minutes.

[0028] ⑥ Finally, add the compound fungicide into the reactor, increase the stirring speed to 400-600 rpm, and continue stirring for 5-10 minutes.

[0029] ⑦ After all the above components are added, increase the stirring speed to 800-1000 rpm and stir for 45-60 minutes until the water-based rust inhibitor cools to room temperature to obtain a highly efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor.

[0030] Any matters not described in the following embodiments are the same as those described in the above specific implementation manner.

[0031] Example

[0032] An efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor. The component contents (mass fractions) of the composite water-based rust inhibitors of Examples 1-10 are shown in Table 1.

[0033] Table 1 Components and contents of nano-SiO2-Al2O3 composite water-based rust inhibitors of Examples 1-10

[0034]

[0035] A method for preparing the above-mentioned nano-SiO2-Al2O3 composite water-based rust inhibitor, the specific process steps of Examples 1-10 are:

[0036] ① First, add 55 to 75 parts of deionized water to the reactor according to the component ratio of each embodiment and heat it to 50°C to 60°C. Then, add 10 to 20 parts of nano-silicon dioxide and 5 to 10 parts of nano-alumina to the reactor in sequence. At the same time, turn on the agitator, control the stirring speed at 300 to 500 rpm, and continue stirring for 30 to 45 minutes.

[0037] ② Add 3.0 to 8.0 parts of compound dispersing aid to the above solution, increase the stirring speed to 500 to 700 rpm, and stir for 15 to 25 minutes.

[0038] The composite dispersing aid is prepared by mixing 60% sodium polyacrylate and 40% polyvinyl pyrrolidone in a weight ratio, and stirring at a stirring speed of 500 rpm for 15 minutes.

[0039] ③ Add 1.0-3.0 parts of compound surfactant and 1.0-3.0 parts of compound auxiliary rust inhibitor into the reactor in sequence, maintain the stirring speed at 500-700 rpm, and the stirring time is 30-45 minutes.

[0040] The composite surfactant is prepared by mixing 80% sodium lauryl sulfate (SDS) and 20% fatty alcohol polyoxyethylene ether (AEO) by weight, and stirring at a stirring speed of 400 rpm for 10 minutes.

[0041] The composite auxiliary rust preventive is prepared by mixing 40% benzotriazole BTA, 30% decanoic acid and 30% dodecenylsuccinic acid according to a weight ratio, and stirring the mixture at a stirring speed of 500 rpm for 20 minutes.

[0042] ④ Reduce the stirring speed to 200-400 rpm, and slowly drip 1.0-4.0 parts of the compound pH adjuster into the reaction kettle until the pH value stabilizes in the range of 6-7.

[0043] The compound pH regulator is prepared by mixing 60% citric acid and 40% disodium hydrogen phosphate according to a weight ratio, and stirring at a stirring speed of 400 rpm for 10 minutes.

[0044] ⑤ Add 1.0 to 3.0 parts of the composite defoamer into the reaction kettle, maintain the stirring speed at 200 to 400 rpm, and continue stirring for 15 to 20 minutes.

[0045] The compound defoamer is prepared by mixing 80% of an organosilicon defoamer and 20% of a polyether defoamer according to a weight ratio, and stirring the mixture at a stirring speed of 500 rpm for 15 minutes.

[0046] ⑥ Finally, add 1.0-3.0 parts of the compound fungicide into the reactor, increase the stirring speed to 400-600 rpm, and continue stirring for 15-20 minutes.

[0047] The compound fungicide is prepared by mixing 25% glutaraldehyde, 40% triclosan, 20% isothiazolinone and 15% phenoxyethanol according to weight ratio, and stirring at a stirring speed of 400 rpm for 10 minutes.

[0048] ⑦ After all the above components are added, the stirring speed is increased to 1000-1200 rpm, stirring for 40-60 minutes, then stopping stirring, and then air cooling to room temperature; a highly efficient and stable nano-SiO2-Al2O3 composite water-based rust inhibitor is obtained.

[0049] According to the components and mass contents of the nano-SiO2-Al2O3 composite water-based rust inhibitor in Examples 1-10 in Table 1, a water-based nano-rust inhibitor was prepared using the above process flow; the test pieces were respectively immersed in the nano-SiO2-Al2O3 composite water-based rust inhibitor prepared in Examples 1-10, taken out and dried, and the rust prevention performance was tested in accordance with SH / T 0533 "Rust Assessment Method for Rust Test Pieces of Anti-Rust Grease". Table 2 shows the technical effects of the implementation of Examples 1-10.

[0050] Table 2 Implementation effect of Examples 1-10

[0051]

[0052] The implementation of the technical effects of the nano-SiO2-Al2O3 water-based rust inhibitor prepared by the above Examples 1-10 shows that the nano-water-based rust inhibitor not only has excellent anti-rust performance, but also has the advantages of being easy to prepare and convenient to use, and can provide a new environmentally friendly nano-water-based rust inhibitor product for the field of metal rust prevention.

[0053] Anyone skilled in the art will be able to utilize the above-disclosed technical content to make many possible changes and modifications to the technical solution of the present invention, or to modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A highly efficient and stable nano-SiO 2 -Al 2 O 3 Compound water-based rust inhibitor, It is characterized in that The compound water-based rust inhibitor comprises the following components in parts by weight: 10 to 20 parts of nano silicon dioxide, 5 to 10 parts of nano aluminum oxide, 3.0 to 8.0 parts of a compound dispersing aid, 1.0 to 3.0 parts of a compound auxiliary rust inhibitor, 1.0 to 3.0 parts of a compound surfactant, 1.0 to 4.0 parts of a compound pH regulator, 1.0 to 3.0 parts of a compound defoaming agent, 1.0 to 3.0 parts of a compound bactericide, and 55 to 75 parts of deionized water.

2. The composite water-based rust inhibitor according to claim 1, It is characterized in that The particle sizes of the nano silicon dioxide and nano aluminum oxide are controlled within the range of 30 to 50 nm.

3. The composite water-based rust inhibitor according to claim 1, It is characterized in that The compound dispersing aid is prepared by mixing 60% to 70% sodium polyacrylate and 30% to 40% polyvinyl pyrrolidone by weight; the compound surfactant is prepared by mixing 70% to 80% sodium dodecyl sulfate SDS and 20% to 30% fatty alcohol polyoxyethylene ether AEO by weight.

4. The composite water-based rust inhibitor according to claim 1, It is characterized in that The composite auxiliary rust preventive is prepared by mixing 40% to 50% of benzotriazole BTA, 30% to 40% of decanoic acid and 20% to 30% of dodecenylsuccinic acid according to weight ratio.

5. The composite water-based rust inhibitor according to claim 1, It is characterized in that The compound pH regulator is prepared by mixing 40% to 60% of citric acid and 40% to 60% of disodium hydrogen phosphate in a weight ratio.

6. The composite water-based rust inhibitor according to claim 1, It is characterized in that The compound defoamer is prepared by mixing 80% to 90% of an organosilicon defoamer and 10% to 20% of a polyether defoamer by weight; the compound bactericide is prepared by mixing 25% to 35% of glutaraldehyde, 30% to 40% of triclosan, 20% to 30% of isothiazolinone and 15% to 25% of phenoxyethanol by weight.

7. A nano-SiO as claimed in claim 1 2 -Al 2 O 3 Preparation method of compound water-based rust inhibitor, It is characterized in that The preparation method comprises the following steps: ① First, add 55-75 parts of deionized water into the reaction kettle and heat it to 50°C-60°C, add nano-silicon dioxide and nano-alumina into the reaction kettle, turn on the stirrer at the same time, control the stirring speed at 300-500 rpm, and continue stirring for 30-45 minutes; ② Add the composite dispersing aid to the above solution, increase the stirring speed to 500-700 rpm, and stir for 15-25 minutes; ③ Add the compound surfactant and the compound auxiliary rust inhibitor into the reactor in sequence, maintain the stirring speed at 500-700 rpm, and the stirring time is 30-45 minutes; ④ Reduce the stirring speed to 200-400 rpm, and slowly drip the compound pH regulator into the reaction kettle until the pH value stabilizes in the range of 6-7; ⑤ Add the compound defoamer into the reaction kettle, keep the stirring speed at 200-400 rpm, and continue stirring for 5-10 minutes; ⑥ Finally, add the compound fungicide into the reactor, increase the stirring speed to 400-600 rpm, and continue stirring for 5-10 minutes; ⑦ After all the above components are added, increase the stirring speed to 800-1000 rpm and stir for 45-60 minutes until the water-based rust inhibitor cools to room temperature to obtain a highly efficient and stable nano-SiO 2 -Al 2 O 3 Compound water-based rust inhibitor.

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