CN103757640B - A kind of micro-emulsion type water-based metal antirust liquid - Google Patents

Abstract

The invention discloses a microemulsion type water-based metal antirust solution, which is composed of the following raw materials in mass percentage: 0-10% of antirust agent, 3-20% of base oil, 0-10% of surfactant and corrosion inhibitor 5-20%, stabilizer 0.5-1.5%, thickener 0-1%, pH regulator 0-5%, and the balance is deionized water. The invention not only solves the disadvantages of existing anti-rust liquids such as oil-based anti-rust liquid that are difficult to remove and difficult to decompose, but also solves the problem that the anti-rust effect of the existing water-based anti-rust liquid cannot reach the anti-rust effect of oil-based anti-rust liquid Combining the advantages of the two antirust fluids, it has good lubrication, cooling, antirust and other functions, and at the same time meets the requirements of environmental protection and economical efficiency.

Description

A kind of microemulsion water-based metal antirust liquid

technical field

The invention relates to a metal antirust liquid, in particular to a microemulsion water-based metal antirust liquid.

Background technique

Metal corrosion is a problem often encountered in production. Metal rust not only damages the shape, color and mechanical properties of the metal workpiece itself, but also reduces the quality of the product, and even makes the product scrapped if it is particularly serious. In 2011 my country's GDP is 7.43 trillion U.S. dollars, and the economic loss caused by corrosion is as high as 220 to 370 billion U.S. dollars, accounting for about 3% to 5% of the national GDP. In order to slow down the corrosion of steel and minimize the loss caused by corrosion, people have taken many anti-corrosion measures, among which the use of anti-rust liquid is the most widely used and most effective one.

Antirust Fluid is a super efficient synthetic penetrant that forms a thin film on metal surfaces to prevent rusting. According to the different components, anti-rust liquid is divided into oil-based anti-rust liquid and water-based anti-rust liquid.

Oil-based antirust fluid is composed of base oil, oil-soluble corrosion inhibitor and auxiliary additives. Oil-based anti-rust liquid can form a dense oil film on the metal surface to isolate water and oxygen in the air to prevent rust. However, the follow-up process of oil-based anti-rust liquid needs to be degreased, and the removal of anti-rust oil is quite difficult. With the increasing shortage of oil resources and the increasing awareness of environmental protection, coupled with the existence of problems such as oil quality is not easy to decompose, oil-based Antirust fluids are gradually being replaced.

Water-based anti-rust liquid is composed of water-soluble anti-rust agent, water-soluble additives, corrosion inhibitor and water. Water-based anti-rust solution is to add a certain amount of anti-rust agent to the aqueous solution to prevent the occurrence of chemical or electrochemical action, and form an insoluble passivation film layer or a reaction film layer to prevent rust. However, after this kind of anti-rust liquid is applied on the metal surface, the liquid film is easy to flow, and after the water volatilizes, a layer of white frost will be formed on the metal surface, losing the proper anti-rust effect, and the anti-rust performance is not as good as that of anti-rust oil. Effect. Moreover, the traditional water-based anti-rust liquid mostly contains nitrite, dichromate and other components. As we all know, nitrite is a carcinogen and is harmful to the health of the operator. Heavy metals are harmful to the environment and also affect the performance and quality of metals. Therefore, it is urgent to develop new green and environment-friendly metal antirust liquid.

Contents of the invention

The purpose of the present invention is to provide a microemulsion type water-based metal antirust solution, which is compounded with borate, triethanolamine and other components for synergistic antirust, and at the same time, an appropriate amount of base oil is added as a lubricant. It eliminates the shortcomings of oil-based and water-based antirust fluids, and at the same time combines the advantages of the two antirust fluids into one, with good lubrication, cooling, and antirust functions.

The technical scheme of the microemulsion type water-based metal antirust liquid of the present invention is as follows:

A kind of microemulsion type water-based metal antirust liquid, its mass percentage is as follows:

in:

(1) Antirust agent

The antirust agent is an organic antirust agent, that is, one or more of fatty acid soaps, sulfonates, alcohol amines, amides, and esters. It is preferable to combine two or more antirust agents to synergistically prevent rust.

(2) Base oil

The base oil is one or more of machine oil, vegetable oil, white oil, silicone oil and kerosene.

(3) Surfactant

The surfactants are sodium dodecylbenzenesulfonate (anionic surfactant LAS), sodium fatty alcohol polyoxyethylene ether sulfate (anionic surfactant AES), sorbitan fatty acid ester polyoxyethylene ether (nonionic One or more of surfactant Tween series), sorbitan fatty acid ester (nonionic surfactant Span series), fatty alcohol polyoxyethylene ether (nonionic surfactant AEO series).

The surfactant is preferably a compound of anionic surfactant and nonionic surfactant.

(4) Other additives

The auxiliary agents added in the present invention also include corrosion inhibitors, stabilizers, thickeners, and pH regulators.

In the antirust solution, the synergistic effect of corrosion inhibitor and antirust agent is usually used, and the corrosion inhibitor is often used in combination with alcohol amine and acid. Alcoholamines can be selected from one or more of monoethanolamine, diethanolamine, and triethanolamine. The acid can be selected from one or more of oleic acid, coconut oil acid and boric acid.

The stabilizer can be selected from one or more of ethanol, isopropanol, n-butanol and n-hexanol.

The thickener can be selected from one or more of sodium hydroxymethyl cellulose, sodium hydroxyethyl cellulose and polyethylene glycol.

The pH regulator can be selected from inorganic alkali or ammonia, and the inorganic base can be selected from sodium carbonate.

Beneficial effect:

There are many kinds of water-soluble antirust agents, mainly including inorganic antirust agents and organic antirust agents. Commonly used inorganic rust inhibitors include sodium nitrite, potassium dichromate, molybdate, tungstate, etc. But because these antirust agents are usually poisonous and pollute the environment, their use is limited. The present invention adopts organic antirust agents, which are environmentally friendly and have no pollution to the environment.

Although the traditional water-based metal anti-rust liquid has good cooling performance and safety, the film-forming effect is poor, and the water-based anti-rust liquid of this method is added with an appropriate amount of base oil to make a film-forming agent. Base oil is not only the carrier of emulsifier and anti-rust agent, but also can form a uniform and dense protective film on the metal surface, making the adsorption film of anti-rust agent molecules tighter, and making it difficult to desorb the weakly adsorbed anti-rust agent molecules. In this way, the resistance to the intrusion of corrosive media such as water molecules and oxygen is strengthened.

Surfactant molecules are composed of polar groups and non-polar groups. The former is hydrophilic and soluble in water, and the latter is lipophilic and soluble in oil. The antirust liquid of the present invention adds surfactant, under the effect of strong stirring, when dispersed phase is dispersed into many small droplets, the surface of droplet will absorb a layer of surfactant, and its lipophilic group extends to In the oil phase, the hydrophilic group extends to the water phase and forms a monomolecular interface film. This interface film has a certain strength, so it has a protective effect on the droplets, so that the droplets will not be aggregated when they collide with each other. That is, it can emulsify the immiscible oil-water two phases to form a stable emulsion.

The surfactant of the present invention adopts an anionic surfactant with good emulsifying performance and certain cleaning and lubricating performance, and is preferably used in combination with a nonionic surfactant for better effect.

The invention provides a micro-emulsion water-based metal anti-rust liquid, which not only solves the shortcomings of existing anti-rust liquids such as oil-based anti-rust liquids, which are difficult to remove and difficult to decompose, but also solves the problems of existing water-based anti-rust liquids. The anti-rust effect of liquid anti-rust liquid is not as good as the anti-rust effect of oil-based anti-rust liquid, and at the same time it meets the requirements of environmental protection, economy and high efficiency.

The micro-emulsion water-based metal antirust liquid of the present invention can be configured with different concentrations according to specific working conditions, and is generally diluted 20 to 30 times for use, and has the advantages of environmental protection, high efficiency and economy. It is mainly used for metal rust prevention in the process of mechanical production, processing and transportation.

Detailed ways

Below in conjunction with the examples, the specific implementation of the present invention will be further described in detail. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Example 1:

(1) Add 12g of silicone oil into a four-neck flask, then add 3g of Tween 20 and 2g of Span 80 in sequence, heat and stir, the speed is controlled at 900r/min, and the temperature is controlled at 70°C.

(2) Dissolve 5g of sodium carbonate, 15g of monoethanolamine borate, 10g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly add them dropwise into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) After stirring, add 2g sodium hydroxymethylcellulose and 2g n-butanol to the above solution, make up the remaining amount of deionized water to 250g, slow down the speed to 200r/min, and continue stirring at room temperature for 30min. That's it.

The formula composition of table one embodiment 1

component name Content, % (m/m) Triethanolamine 4 silicone oil 4.8 Tween 20 (nonionic surfactant) 1.2 Span 80 (nonionic surfactant) 0.8 monoethanolamine borate 6 Sodium carbonate 2 polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 Butanol 0.8 Deionized water 78.8

Example 2:

(1) Add 12g of kerosene to a four-neck flask, then add 4.5g of Tween 80 and 0.5g of Span 80 in turn, heat and stir, the speed is controlled at 900r/min, and the temperature is controlled at 50°C.

(2) Dissolve 15g of monoethanolamine borate, 15g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly add it dropwise into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) After stirring, add 2g sodium hydroxymethylcellulose, 2g n-butanol, and 10g ammonia water to the above solution, make up the remaining amount of deionized water to 250g, slow down the speed to 200r/min, and continue stirring at room temperature for 30min. That's it.

The formula composition of table two embodiment 2

component name Content, % (m/m) Triethanolamine 6 kerosene 4.8 Tween 80 (nonionic surfactant) 1.8 Span 80 (nonionic surfactant) 0.2 monoethanolamine borate 6 ammonia 4

polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 Butanol 0.8 Deionized water 74.8

Example 3:

(1) Add 10g of mechanical oil to the four-neck flask, then add 0.75g of AEO-3, 0.5g of AEO-7, and 1.25g of AEO-9 in sequence, heat and stir, the speed is controlled at 500r/min, and the temperature is controlled at 50°C.

(2) Dissolve 5g of sodium carbonate, 20g of monoethanolamine borate, 20g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly add them dropwise into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) After stirring, add 2g sodium hydroxymethylcellulose and 5g n-butanol to the above solution, make up the remaining amount of deionized water to 250g, slow down the speed to 200r/min, and continue stirring at room temperature for 30min. That's it.

The formula composition of table three embodiment 3

component name Content, % (m/m) Triethanolamine 8 Machinery oil 4 AEO-3 (Nonionic Surfactant) 0.3 AEO-7 (Nonionic Surfactant) 0.2 AEO-9 (Nonionic Surfactant) 0.5 monoethanolamine borate 8 Sodium carbonate 2 polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 Butanol 0.8

Deionized water 74.6

Example 4:

(1) Add 7.5g of silicone oil into a four-neck flask, then add 0.15g of AES and 0.60g of AEO-3 in sequence, heat and stir, the speed is controlled at 300r/min, and the temperature is controlled at 70°C.

(2) Dissolve 15g of monoethanolamine borate, 10g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly add it dropwise into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) After stirring, add 2g sodium hydroxymethylcellulose, 3g n-hexanol, 10g ammonia water to the above solution, make up the remaining amount of deionized water to 250g, and continue stirring at constant speed and room temperature for 30min. That's it.

The formula composition of table four embodiment 4

component name Content, % (m/m) Triethanolamine 4 silicone oil 3 AEO-3 (Nonionic Surfactant) 0.24 AES (Anionic Surfactant) 0.06 monoethanolamine borate 6 ammonia 4 polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 n-Hexanol 1.2 Deionized water 79.9

Example 5:

(1) Add 7.5g of vegetable oil to a four-neck flask, then add 1.5g of Tween 80 and 1g of Span 80 in turn, heat and stir, the speed is controlled at 500r/min, and the temperature is controlled at 50°C.

(2) Dissolve 15g of monoethanolamine borate, 25g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly add it dropwise into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) Add 2g of sodium hydroxymethylcellulose, 3g of n-hexanol, and 10g of ammonia water to the above solution after stirring, make up the remaining amount of deionized water to 250g, slow down the speed to 200r/min, and continue stirring at room temperature for 30min. That's it.

The formula composition of table five embodiment 5

component name Content, % (m/m) Triethanolamine 10 vegetable oil 3 Tween 80 (nonionic surfactant) 0.6 Span 80 (nonionic surfactant) 0.4 monoethanolamine borate 6 ammonia 4 polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 n-Hexanol 1.2 Deionized water 73.2

Embodiment 6 (total mass 250g)

(1) Add 7.5g of white oil to a four-neck flask, then add 0.75g of AEO-3, 0.5g of AEO-7, and 1.25g of AEO-9 in sequence, heat and stir, and control the speed at 500r/min and the temperature at 50°C.

(2) Dissolve 5g of sodium carbonate, 30g of monoethanolamine borate, 25g of triethanolamine, and 2g of polyethylene glycol in an appropriate amount of deionized water in sequence, and slowly drop them into (1) after completely dissolving.

(3) Continue stirring the mixture in (2) at constant temperature for 1 h.

(4) After stirring, add 2g sodium hydroxymethylcellulose and 3g n-hexanol to the above solution, make up the remaining amount of deionized water to 250g, slow down the speed to 200r/min, and continue stirring at room temperature for 30min. That's it.

The formula composition of table six embodiment 6

component name Content, % (m/m) Triethanolamine 10 white oil 3 AEO-3 (Nonionic Surfactant) 0.3

AEO-7 (Nonionic Surfactant) 0.2 AEO-9 (Nonionic Surfactant) 0.5 monoethanolamine borate 12 Sodium carbonate 2 polyethylene glycol 0.8 sodium hydroxymethyl cellulose 0.8 n-Hexanol 1.2 Deionized water 69.2

Although the present invention has been described in detail above in the specific embodiments, some modifications can be made on this basis, and these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the claims of the present invention. range.

Performance Testing:

The performance of the antirust solution prepared in this example was measured, and compared with the commercially available product D, which is a metal antirust solution with nitrite as the main antirust agent. The various performance indicators are determined according to the following methods:

Test method (SH0365-92):

1. Anti-rust test

This method is used to check the anti-rust ability of the prepared anti-rust liquid to metal.

Main instruments and materials: constant temperature controller, wetting tank, corundum emery cloth, test piece (steel sheet No. 45 specification: 50mm×25mm×2mm), absorbent cotton, gasoline for washing, analytical pure ethanol for washing, beaker.

experiment procedure:

(1) Polish the test piece with gauze, wash it with gasoline→gasoline→ethanol→ethanol in sequence, and then dry it for later use.

(2) Prepare 100ml of anti-rust solution with a concentration of 4% in a beaker, dip the prepared solution with a round glass rod, and drop 5 drops on the treated test piece, each drop has a diameter of 4-5mm, each drop Keep a certain distance between them and do not connect them. At the same time, take a test piece as a blank control.

(3) After the test piece is dried, put it on the porcelain plate in the wetting tank, cover the wetting tank cover, and place it under the condition of 35±2℃.

After standing for 3 days, no rust spots appeared on the test piece as a whole. In order to shorten the test period, we adjusted the above step (3), imitating the harsh conditions, spraying salt spray on the test piece, and adjusting it to the following step (4) )step.

(4) Prepare a 1% NaCl solution and spray it on the test piece with a sprayer. After the test piece is dried, put it on the porcelain plate in the wetting tank, cover the wetting tank cover, and place it under the condition of 35±2℃.

After the test period (one month) expires, observe the condition of the test piece.

Table 1 Anti-rust performance test

Anti-rust products The number of rust spots level Qualified or not Commercially available product D. 1 A qualified Embodiment 1 of the present invention 0 A qualified Embodiment 2 of the present invention 0 A qualified Embodiment 3 of the present invention 0 A qualified Embodiment 4 of the present invention 0 A qualified Embodiment 5 of the present invention 0 A qualified Embodiment 6 of the present invention 0 A qualified

2. Anticorrosion test

This method is to immerse the metal piece in the antirust solution at a certain temperature, and after a specified time, use the color change of the metal test piece to evaluate the anticorrosion performance of the antirust solution on the metal.

Main instruments and materials: constant temperature water bath, absorbent cotton, test piece (No. 45 steel sheet specification: 50mm×25mm×2mm).

experiment procedure:

(1) Polish the test piece with gauze, wash it with gasoline→gasoline→ethanol→ethanol in sequence, and then dry it for later use.

(2) Put the test piece into a bottle of antirust solution with 4% concentration, make the antirust solution about 10mm higher than the top of the test piece, then cover the bottle cap and put it in a constant temperature water bath at 55±2℃ test.

After the test period (one month) expires, observe the condition of the test piece.

Table 2 Anti-corrosion performance test

Anti-rust products Soaking time/day Exterior Qualified or not Commercially available product D. 30 No rust, slightly darker than before unqualified Embodiment 1 of the present invention 30 No rust, bright as new qualified Embodiment 2 of the present invention 30 No rust, bright as new qualified Embodiment 3 of the present invention 30 No rust, bright as new qualified Embodiment 4 of the present invention 30 No rust, bright as new qualified

Embodiment 5 of the present invention 30 No rust, bright as new qualified Embodiment 6 of the present invention 30 No rust, bright as new qualified

Claims (3)

1. a microemulsion type water-based metal antirust liquid, is characterized in that, mass percentage is composed as follows: 2. a microemulsion type water-based metal antirust liquid, is characterized in that, mass percentage is composed as follows: 3. a microemulsion type water-based metal antirust liquid, is characterized in that, mass percentage is composed as follows: