CN100441641C - A new type of water-based antirust composition - Google Patents

Abstract

The present invention provides a water anti-rust agent which comprises a tetrazole compound expressed by the right expression, polyethylene glycol, triethanolamine and a solvent, wherein R and R' respectively represent hydrogen atoms, substituted or non-substituted alkyl with one to twenty carbon atoms, substituted or non-substituted naphthenic groups, phenyl, alkylphenyl and aralkyl and substituted or non-substituted amino groups, sulfhydryl or alkyl sulfhydryl.

Description

A new type of water-based antirust composition

technical field

The invention relates to a novel water-based antirust composition, in particular to a long-acting water-based antirust composition containing tetrazolium.

Background technique

In recent years, with the continuous development of the machinery industry, the demand for antirust compositions for machinery and equipment is also increasing. Meanwhile, since global environmental problems are becoming more and more serious, the environmental problems caused by antirust compositions have also attracted people's attention.

Currently commonly used antirust compositions include oily antirust agents containing xylene, gasoline, and nitrite. Because the above-mentioned antirust composition contains harmful substances such as xylene, gasoline and nitrite, it will cause certain damage to the environment, and there is also a potential safety hazard, because xylene and gasoline are combustible, and nitrite is a severe Toxic substance.

For the problems referred to above, U.S. Patent No. 5,744,069 (Maeda et al.) discloses a water-soluble metal rust inhibitor composition, which includes a tetrazolium compound or a water-soluble salt thereof, and its molecular formula is:

wherein R and R' each represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group, a phenyl group, an alkylphenyl group, an amino group, a mercapto group or an alkylmercapto group. The antirust composition has the antirust properties of conventional antirust agents, and is environmentally friendly because it does not contain harmful substances such as xylene, gasoline, and dinitrate.

In addition, Chinese patent publication CN1035522 (Luo Wenyan et al.) discloses a rust inhibitor composition, which includes polyethylene glycol, oleic acid, barium petroleum sulfonate, triethanolamine, paraffin and distilled water. Polyethylene glycol is used as a film-forming agent and triethanolamine is used as a slow-release agent in the antirust composition, which avoids the use of harmful substances such as xylene and gasoline, and also achieves a certain antirust effect .

Although above-mentioned these antirust agents have all avoided the harmful substances such as xylene, gasoline, nitrite, and all have certain antirust effect. However, there is still a need in the art to further improve its antirust effect and storage stability.

Contents of the invention

The object of the present invention is to provide a water-based anti-rust agent with better and more stable anti-rust effect, which is friendly to the environment.

The inventors of the present invention found that the effect of the present invention can be achieved by using tetrazolium compound, polyethylene glycol and triethanolamine in combination, that is, the antirust effect can be significantly improved, and the formed product has better stability.

Based on above-mentioned discovery, the present invention provides a kind of water-based rust preventive composition on the one hand, it comprises:

(1) A tetrazole compound represented by the following formula:

wherein R and R' each represent a hydrogen atom, an alkyl group having 1-20 carbon atoms, a cycloalkyl group, a phenyl group, an alkylphenyl group, an aralkyl group, an amino group, a mercapto group or an alkyl mercapto group;

(2) polyethylene glycol;

(3) triethanolamine;

(4) Solvent.

In a preferred example of the present invention, the rust inhibitor also includes one or more substances selected from thiourea, sodium bicarbonate, sodium phosphate

In another preferred example of the present invention, the tetrazole compound is represented by the following formula:

wherein R and R' each represent a hydrogen atom, an alkyl group having 1-4 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3-6 carbon atoms, a phenyl group, an alkyl group having 1-4 carbon atoms Alkyl-substituted phenyl, benzyl, amino, mercapto or mercapto substituted by an alkyl group having 1 to 4 carbon atoms.

In another preferred example of the present invention, the tetrazole compound is 5-benzyl-tetrazolium.

In another preferred example of the present invention, the polyethylene glycol has a molecular weight of 200-600.

In another preferred embodiment of the present invention, the solvent contains water.

In another preferred example of the present invention, the rust inhibitor includes:

(1) 10-15% by weight of the tetrazole compound;

(2) 3-7% by weight of the triethanolamine;

(3) 2-8% by weight of polyethylene glycol;

(4) 70-85% by weight of solvent.

In another preferred example of the present invention, the rust inhibitor includes:

(1) 10-15% by weight of the tetrazole compound;

(2) 3-7% by weight of the triethanolamine;

(3) 2-8% by weight of polyethylene glycol;

(4) 0.2-2% by weight of thiourea;

(5) 1-5% by weight of sodium bicarbonate;

(6) Sodium phosphate of 3% by weight;

(7) 60-80.8% by weight of water.

Another aspect of the present invention provides an aqueous rust inhibitor composition, which comprises 5-benzyl-tetrazolium and a solvent.

The antirust composition of the present invention can be applied to the rust prevention of facility steel materials such as vehicles, bridges, storage, pipelines, mechanical equipment, etc., and at the same time provides a good guarantee for environmental protection and mass production in factories. It is a green, environment-friendly, long-lasting and stable water-based rust inhibitor.

Detailed ways

The invention provides a novel water-based antirust agent, which comprises:

(1) A tetrazole compound represented by the following formula:

wherein R and R' each represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or substituted cycloalkyl group, a phenyl group, an alkylphenyl group, an aralkyl group, a substituted or unsubstituted group Substituted amino, mercapto or alkylmercapto;

(2) polyethylene glycol;

(3) triethanolamine;

(4) Solvent.

Tetrazolium and its derivatives have antibacterial, anti-inflammatory and plant growth regulation effects, and are a powerful anti-fogging agent and anti-bronze agent, so it is widely used in many fields, such as photosensitive materials, biomedicine, Many fields such as chemical industry and machinery. Moreover, the compound can perform a chelation reaction on many metal ions, and the formed insoluble chelate is deposited on the metal surface to form a protective film, so that the metal surface is converted from an "active state" to a "passive state", thereby achieving anti-rust effect. The tetrazole compound that the present invention relates to is shown in the following formula:

wherein R and R' each represent a hydrogen atom, a substituted or unsubstituted alkyl group having 1-20 carbon atoms, a substituted or substituted cycloalkyl group, a phenyl group, an alkylphenyl group, an aralkyl group, a substituted or unsubstituted group Substituted amino, mercapto or alkylmercapto. Examples of such tetrazole compounds can be found in particular in US Pat. No. 5,744,069 (Maeda et al.), which is hereby incorporated by reference in its entirety.

In the present invention, R and R' preferably each represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms (such as methyl, ethyl, n-propyl and n-butyl), a substituted group having 3 to 6 carbon atoms or unsubstituted (preferred substituent is an alkyl group having 1-4 carbon atoms), cycloalkyl (eg, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl), phenyl, phenyl substituted by an alkyl group having 1-4 carbon atoms (such as ethylphenyl, propylphenyl, butylphenyl), benzyl, amino, mercapto or mercapto substituted by an alkyl group having 1-4 carbon atoms.

Specific examples of the tetrazole compound may be 1H-tetrazolium, 5-amino-1H-tetrazolium, 5-methyl-1H-tetrazolium, 1-methyl-5-ethyl-tetrazolium Azole, 1-methyl-5-mercapto-tetrazolium, 5-(2-aminophenyl)-1H-tetrazolium, 1-cyclohexyl-5-mercapto-tetrazolium, 1-phenyl-5 -Mercapto-tetrazole, 1-carboxymethyl-5-mercapto-tetrazole, 5-phenyl-1H-tetrazole, 5-benzyl-tetrazole and the like.

In a preferred example of the present invention, the content of the tetrazole compound is 10-15% by weight, more preferably 11-13% by weight.

In the present invention, triethanolamine is a corrosion-promoting and inhibitory agent for ferrous metals, which has the effect of inhibiting corrosion of steel, and has a good synergistic effect, which can enhance the corrosion-inhibiting effect of other reagents. In a preferred example of the present invention, the content of the triethanolamine is 3-7% by weight, more preferably 4-6%.

In the present invention, polyethylene glycol is a colorless viscous liquid, which can be prepared by condensation of ethylene glycol. It is a polymer film-forming substance, which can form a colorless and transparent film together with other additives, thereby separating steel from corrosive atmosphere, etc., and achieving the purpose of rust prevention. Preferably the polyethylene glycol has an average number average molecular weight of about 200-600. In a preferred example of the present invention, the content of polyethylene glycol is 2-8% by weight, more preferably 4-6%.

In the present invention, there is no specific limitation on the solvent as long as it can dissolve the components in the present invention. In consideration of influence on the environment, preferred solvents are water, organic compounds miscible with water, or mixtures thereof. A more preferable solvent is a mixed solvent of ethanol and water because it accelerates the drying speed of the antirust film. In a preferred example of the present invention, the content of the solvent is 70-85% by weight, more preferably 75-80%.

The antirust composition of the present invention can also include other auxiliary agents commonly used in the art, such as antirust agent, slow-release agent, emulsifier, flux, surfactant, filler, cleaning agent, water softener, digestant, Antacids, fire extinguishing agents, etc. Preferably, the antirust composition of the present invention may contain one or more substances selected from thiourea, sodium bicarbonate and sodium phosphate.

In another preferred example of the present invention, the antirust composition of the present invention includes 10-15% by weight of the tetrazolium compound, 3-7% by weight of the triethanolamine, 2-8% by weight of poly Ethylene glycol, 0.2-2% by weight of thiourea, 1-5% by weight of sodium bicarbonate, 3% by weight of sodium phosphate, 60-80.8% by weight of water. Preferably, the rust inhibitor composition comprises 11-13% by weight of the tetrazole compound, 4-6% by weight of the triethanolamine, 4-6% by weight of polyethylene glycol, 1-1.5% by weight % of thiourea, 2-4% by weight of sodium bicarbonate, 3% by weight of sodium phosphate, 66.5-75% by weight of water.

Another aspect of the present invention provides a novel rust inhibitor composition comprising 5-benzyl-tetrazolium and a solvent. The solvent is the same as the aforementioned solvent.

The present invention will be described in detail below in conjunction with the examples, and these examples are only for the purpose of illustration, and do not limit the scope of the present invention. In the embodiments of the present invention, the raw materials used are all chemically pure reagents, and the contents of the components are all by weight.

Example

In the embodiments of the present invention, the specific reagents used are as follows:

Thiourea: (Shanghai No.1 Reagent Factory)

Sodium bicarbonate: (Comprehensive Operation Department of Shanghai Reagent No. 1 Factory)

Sodium Phosphate: (Shanghai Xinhua Chemical Factory)

5-Phenyl-tetrazolium: (Yixing Photochemical Factory)

5-Chloro-tetrazolium: (Yixing Photochemical Factory)

5-Benzyl-tetrazolium: (Yixing Photochemical Factory)

Triethanolamine: content 80 (Yixing Photochemical Factory)

Polyethylene glycol: 400 molecules (Yixing Photochemical Factory)

Sodium Benzoate: (Shanghai Xinhua Chemical Factory)

Sodium nitrite: (Shanghai Reagent No. 1 Factory)

Benzotriazole: (Shanghai Xinhua Chemical Factory)

Dicyclohexylamine nitrite: (Shanghai Xinhua Chemical Factory)

Zinc Phosphate: (Shanghai Xinhua Chemical Plant)

Preparation Example 1

Add the components shown in Tables 1 and 2 into a 500-liter reactor, and stir evenly at room temperature to obtain a rust preventive. Unless otherwise stated, the components listed in Tables 1 and 2 are parts by weight.

Table 1

Example 1 2 3 4 5 6 Thiourea 1 2 0.5 0.5 0.5 1 sodium bicarbonate 2 4 1.5 1.5 1.5 1 Sodium Phosphate 3 3 3 3 3 3 5-Benzyl-tetrazolium 11 10 15 12 10 12 Triethanolamine 3 4 5 6 3 2 polyethylene glycol 3 2 5 2 2 2 water 77 75 70 70 80 79

Table 2

Evaluation of rust inhibitors

The antirust agent obtained in Preparation Example 1 was placed for one week, and then its storage stability was evaluated by observing the appearance, and the results are listed in Table 3.

The antirust agent obtained in Preparation Example 1 was heated to 90° C. and then its appearance was observed to evaluate the high temperature stability of the antirust agent. The results are listed in Table 3.

The anti-rust agent obtained in Preparation Example 1 was cooled to 10° C., and then the low-temperature stability of the anti-rust agent was evaluated by observing its appearance. The results are listed in Table 3.

The antirust agent obtained in Preparation Example 1 was coated on the sample (A-3 low carbon steel small cylinder, diameter 1.5 cm, thickness 0.5 cm)). The sample was placed outdoors, and its appearance was observed after 3 months, 6 months, 9 months and 12 months, and the antirust effect was evaluated. The results are recorded in Table 3.

table 3

project Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Exterior   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation pH value 8-9 8-9 8-9 8-9 8-9 8-9 High temperature stability Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering Low temperature stability Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering Uniform, no layering After the sample is placed for 3 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever After the sample is placed for 6 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever After the sample is placed for 9 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever After the sample is placed for 12 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever

Table 3 (continued)

project Comparative example 1 Comparative example 2 Comparative example 3 Comparative example 4 Comparative Example 5 Comparative example 6 Exterior   Uniform, no layering, no precipitation There is precipitation after standing for a period of time There is precipitation after standing for a period of time   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation   Uniform, no layering, no precipitation pH value 9-10 9-10 7-8 7-8 7-8 7-8 high temperature stability Uniform, no layering There is precipitation after standing for a period of time There is precipitation after standing for a period of time Uniform, no layering Uniform, no layering Uniform, no layering low temperature stability slightly precipitated There is precipitation after standing for a period of time There is precipitation after standing for a period of time slightly precipitated slightly precipitated slightly precipitated After the sample is placed for 3 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever After the sample is placed for 6 months No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever No rust on the surface, bright as ever After the sample was placed for 9 months No rust on the surface, bright as ever No rust on the surface, bright as ever The surface is lightly rusted without losing luster The surface is lightly rusted without losing luster The surface is lightly rusted without losing luster No rust on the surface, bright as ever After the sample is placed for 12 months No rust on the surface, bright as ever The surface is lightly rusted without losing luster Slightly small spots on the surface Slightly small spots on the surface Slightly small spots on the surface The surface is lightly rusted without losing luster

It can be seen from Table 3 that the appearance, low-temperature stability and high-temperature stability of the antirust agent of the present invention are all better than those of the comparative examples. Moreover, the sample treated with the antirust agent of the present invention can also maintain the antirust effect after being placed for 1 year, and its performance is obviously better than that of the comparative example.

Evaluation of Antirust Efficiency of 5-Benzyl-tetrazolium

The antirust efficiency of antirust agent can be evaluated by weight loss method. In the weight loss method measurement, the weight loss Δw can be measured, and then the corrosion inhibition efficiency P can be calculated according to the following formula:

P=[Δw ₀ (without corrosion inhibitor)−Δw (with corrosion inhibitor)]/Δw ₀ (without corrosion inhibitor).

In the test, the instrument used is TG328B electro-optical analytical balance. The sample used is A-3 low carbon steel small cylinder (diameter 1.5cm, thickness 0.5cm) (commercially available small iron nails).

First, accurately weigh the weight of the sample, then immerse it in 200 ml of 3.5% sodium chloride corrosion solution, take it out after soaking for a certain period of time, dry it, weigh it, and calculate the weight loss Δw ₀ . The results are listed in Table 4.

Soak the sample in various antirust agents for 3 minutes, take it out and dry it, and weigh it. Then immerse in 200 ml of 3.5% sodium chloride corrosion solution, take it out after soaking for a certain period of time, dry, weigh, and calculate the weight loss Δw. The results are listed in Table 4.

It can be seen from the above table that the antirust effect of 5-benzyl-tetrazolium is better than that of other tetrazole compounds.

Claims (7)

1. water-based antirust agent, it comprises:

(1) tetrazotized zole compound represented of the following formula of 10-15 weight %:

Wherein R and R ' represent hydrogen atom separately, have the alkyl of 1-20 carbon atom, cycloalkyl, phenyl, alkyl phenyl, aralkyl, amino or sulfydryl;

(2) polyoxyethylene glycol of 2-8 weight %;

(3) trolamine of 3-7 weight %;

(4) solvent of 70-85 weight %.

2. rust-preventive agent as claimed in claim 1, it also comprises one or more materials that are selected from thiocarbamide, sodium bicarbonate, the sodium phosphate.

3. rust-preventive agent as claimed in claim 1 is characterized in that described tetrazotized zole compound is expressed from the next:

Wherein R and R ' represent hydrogen atom separately, have the alkyl of 1-4 carbon atom, have the cycloalkyl of 3-6 carbon atom, phenyl, benzyl, amino or sulfydryl.

4. as claim 1 or 3 described rust-preventive agent, it is characterized in that described tetrazotized zole compound is 5-benzyl-tetrazole.

5. rust-preventive agent as claimed in claim 1, the molecular weight that it is characterized in that described polyoxyethylene glycol is 200-600.

6. rust-preventive agent as claimed in claim 1 is characterized in that described solvent comprises water.

7. rust-preventive agent as claimed in claim 2 is characterized in that described rust-preventive agent comprises:

(1) the described tetrazotized zole compound of 10-15 weight %;

(2) the described trolamine of 3-7 weight %;

(3) polyoxyethylene glycol of 2-8 weight %;

(4) thiocarbamide of 0.2-2 weight %;

(5) sodium bicarbonate of 1-5 weight %;

The sodium phosphate of (6) 3 weight %;

(7) water of 60-80.8 weight %.