Defatting and rust removing surfactant and method for its preparation

Abstract

The application discloses a degreasing and rust-removing surfactant and a preparation method thereof, and relates to the field of surfactants, which is prepared from the following raw materials in parts by weight: organic acid: 60-90 parts; ethylenediaminetetraacetic acid tetrasodium: 1-3 parts; sodium carboxymethyl cellulose: 1-4 parts; penetrating agent: 1-5 parts; inorganic acid: 80-120 parts; and water: 400-600 parts. The application has the effect of improving the rust-removing and degreasing capacity of the surfactant on a metal surface.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of surfactants, in particular to a degreasing and rust-removing surfactant and a preparation method thereof. BACKGROUND

[0002] Surfactants are generally used to remove various types of dirt, and are widely used, such as in the field of metal manufacturing. Lubricating oil is usually used for metal lubrication, which causes other contaminants to adhere, making the metal more prone to corrosion and rusting.

[0003] At present, in order to remove grease, surfactants are used to emulsify and disperse the grease on the metal surface, thereby facilitating the removal of the grease from the metal surface.

[0004] However, when cleaning metal, it is usually necessary to not only remove the grease on the surface of the metal, but also to clean the rust stains on the surface of the metal, so there is an urgent need for a surfactant that has good degreasing and rust-removing effects. SUMMARY

[0005] In order to improve the problem that surfactants are difficult to simultaneously have degreasing and rust-removing capabilities, the present application provides a degreasing and rust-removing surfactant and a preparation method thereof.

[0006] In one aspect, the present application provides a degreasing and rust-removing surfactant using the following technical solution:

[0007] A degreasing and rust-removing surfactant is made from raw materials including the following weight parts:

[0008] Organic acid: 60-90 parts;

[0009] Tetrasodium ethylenediaminetetraacetate: 1-3 parts;

[0010] Sodium carboxymethyl cellulose: 1-4 parts;

[0011] Penetrant: 1-5 parts;

[0012] Inorganic acid: 80-120 parts;

[0013] Water: 400-600 parts

[0014] By using the above technical solution, the use of organic acid and inorganic acid improves the rust-removing effect and efficiency, and under the combined action of tetrasodium ethylenediaminetetraacetate, sodium carboxymethyl cellulose, and penetrant, the degreasing rate of the metal surface is improved, and the rust-removing rate is also improved. Under the comprehensive action, the effect of the surfactant on the rust-removing and degreasing of the metal surface is improved.

[0015] Optionally, the weight ratio of the tetrasodium ethylenediaminetetraacetate to the sodium carboxymethyl cellulose is 1:(1-3).

[0016] By adopting the above technical solution, by controlling the weight ratio of tetrasodium ethylenediaminetetraacetate to sodium carboxymethyl cellulose, the rust removal rate of the degreasing and rust removal surfactant is increased to 378g·h -1 ·m -2 , the degreasing rate reaches 95.3%, and under the comprehensive action, the effect of the surfactant on the rust removal and degreasing of the metal surface is improved.

[0017] Optionally, the penetrant includes one or more of isooctanol polyoxyethylene ether, sodium dodecyl benzene sulfonate, alkyl phenol polyoxyethylene ether, dodecyl dimethyl amine oxide, and cocamidopropyl betaine.

[0018] Preferably, the penetrant includes alkyl phenol polyoxyethylene ether and isooctanol polyoxyethylene ether.

[0019] Preferably, the weight ratio of the alkyl phenol polyoxyethylene ether to the isooctanol polyoxyethylene ether is 1:(0.5-5).

[0020] Preferably, the weight ratio of the alkyl phenol polyoxyethylene ether to the isooctanol polyoxyethylene ether is 2:1.

[0021] By adopting the above technical solution, by adopting alkyl phenol polyoxyethylene ether and isooctanol polyoxyethylene ether as the penetrant, and adjusting the ratio of the two, under the synergistic action of the two, the rust removal rate of the degreasing and rust removal surfactant is increased to 391g·h -1 ·m -2 , the degreasing rate reaches 97.9%, and under the comprehensive action, the effect of the surfactant on the rust removal and degreasing of the metal surface is improved.

[0022] Optionally, the organic acid includes one or more of citric acid, oxalic acid, hydroxyethylidene diphosphonic acid, and sulfamic acid.

[0023] Preferably, the organic acid is hydroxyethylidene diphosphonic acid.

[0024] Optionally, the inorganic acid includes one or more of phosphoric acid, hydrofluoric acid, and nitric acid.

[0025] Preferably, the inorganic acid is phosphoric acid.

[0026] By adopting the above technical solution, by adjusting the types of the organic acid and the inorganic acid, hydroxyethylidene diphosphonic acid and phosphoric acid are selected, and the rust removal rate and the degreasing rate of the degreasing and rust removal surfactant are improved.

[0027] In another aspect, the application provides a preparation method of a degreasing and rust-removing surfactant, which adopts the following technical scheme: a preparation method of a degreasing and rust-removing surfactant, comprising the following steps:

[0028] The permeating agent, the inorganic acid, the hydroxyethylidene diphosphonic acid, the tetrasodium ethylenediaminetetraacetate, the sodium carboxymethyl cellulose and the water are uniformly stirred to obtain the degreasing and rust-removing surfactant.

[0029] Preferably, the step of uniformly stirring the permeating agent, the inorganic acid, the hydroxyethylidene diphosphonic acid, the tetrasodium ethylenediaminetetraacetate, the sodium carboxymethyl cellulose and the water comprises the following steps:

[0030] The water is divided into three portions, the permeating agent, the tetrasodium ethylenediaminetetraacetate and the sodium carboxymethyl cellulose are uniformly mixed with the first portion of water to obtain a first mixture, the inorganic acid and the hydroxyethylidene diphosphonic acid are uniformly mixed with the second portion of water to obtain a second mixture, and the first mixture, the second mixture and the third portion of water are uniformly mixed; the weight ratio of the first portion of water, the second portion of water and the third portion of water is 1:6:3.

[0031] Preferably, the step of uniformly mixing the first mixture, the second mixture and the third portion of water comprises the following steps: the first mixture is added to the second mixture, and the third portion of water is added while stirring.

[0032] By adopting the above technical scheme, all components are divided into two groups and mixed with water respectively, the permeating agent, the tetrasodium ethylenediaminetetraacetate and the sodium carboxymethyl cellulose are mixed with the first portion of water to obtain a first mixture, the inorganic acid and the hydroxyethylidene diphosphonic acid are mixed with the second portion of water to obtain a second mixture, and finally the first mixture, the second mixture and the third portion of water are mixed, which improves the uniformity of the dispersion of each component in the system and avoids the uneven dispersion of the components with low content in the system as much as possible.

[0033] In summary, the application has at least one of the following beneficial technical effects:

[0034] 1. The use of organic acid and inorganic acid improves the rust removal effect and efficiency, and under the joint action of tetrasodium ethylenediaminetetraacetate, sodium carboxymethyl cellulose and a permeating agent, the degreasing rate on the metal surface is improved, and the rust removal rate is also improved, and under the comprehensive action, the effect of the surfactant on the rust removal and degreasing of the metal surface is improved;

[0035] 2. By controlling the weight ratio of tetrasodium ethylenediaminetetraacetate and sodium carboxymethyl cellulose, the rust removal rate of the degreasing and rust-removing surfactant is improved to 378g·h -1 ·m -2 , the degreasing rate reaches 95.3%, and under the comprehensive action, the effect of the surfactant on the rust removal and degreasing of the metal surface is improved;

[0036] 3. By using a compound of alkylphenol polyoxyethylene ether and isooctanol polyoxyethylene ether as a penetrant, and adjusting their ratio, the rust removal rate of the degreasing and rust-removing surfactant was increased to 391 g·h under their synergistic effect. -1 ·m -2 The degreasing rate reached 97.9%, and the combined effect improved the rust removal and degreasing effect of surfactants on metal surfaces.

[0037] 4. A first mixture is prepared by mixing the penetrant, tetrasodium ethylenediaminetetraacetate, and sodium carboxymethyl cellulose with a first portion of water. A second mixture is prepared by mixing the inorganic acid and hydroxyethylidene diphosphonic acid with a second portion of water. Finally, the first and second mixtures are combined with a third portion of water. This process improves the uniformity of dispersion of the components in the system and minimizes the possibility of uneven dispersion of components with lower content. This increases the rust removal rate of the degreasing and rust-removing surfactant to 415 g·h. -1 ·m -2 The degreasing rate reached 99.2%. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments. The following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments were performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention.

[0039] Examples 1-15

[0040] The raw material composition and proportions of Examples 1-15 are shown in Table 1.

[0041] Examples 1-15 provide a degreasing and rust-removing surfactant, and its preparation method is as follows:

[0042] A penetrant, inorganic acid, hydroxyethylidene diphosphonic acid, tetrasodium ethylenediaminetetraacetate, and sodium carboxymethyl cellulose were added to water and stirred until homogeneous to obtain a degreasing and rust-removing surfactant.

[0043] In Examples 1-15, phosphoric acid was used as the inorganic acid.

[0044] Table 1: Raw material composition and ratio of degreasing and rust-removing surfactants

[0045]

[0046] Example 16

[0047] Example 16 provides a degreasing and rust-removing surfactant, and its preparation method is as follows:

[0048] Divide the water into three portions, each weighing 300g, 150g, and 50g respectively. Add the penetrant, sodium EDTA, and sodium carboxymethyl cellulose to 50g of water and stir until homogeneous to obtain the first mixture. Add the inorganic acid and hydroxyethylidene diphosphonic acid to 300g of water and stir until homogeneous to obtain the second mixture. Finally, add the first mixture to the second mixture while stirring and adding the remaining 150g of water to obtain the degreasing and rust-removing surfactant.

[0049] Comparative Example 1

[0050] Comparative Example 1 provides a degreasing and rust-removing surfactant. The difference between Comparative Example 1 and Example 2 is that in Comparative Example 1, an equal amount of water is used to replace sodium ethylenediaminetetraacetate and sodium carboxymethyl cellulose.

[0051] Comparative Example 2

[0052] Comparative Example 2 provides a degreasing and rust-removing surfactant. The difference between Comparative Example 2 and Example 2 is that an equal amount of sodium ethylenediaminetetraacetate tetrasodium is used instead of sodium carboxymethyl cellulose in Comparative Example 2.

[0053] Comparative Example 3

[0054] Comparative Example 3 provides a degreasing and rust-removing surfactant. The difference between Comparative Example 3 and Example 2 is that an equal amount of sodium carboxymethyl cellulose is used instead of sodium ethylenediaminetetraacetate.

[0055] Testing and Inspection

[0056] The rust removal rate and degreasing rate of the degreasing and rust-removing surfactants prepared in Examples 1-16 and Comparative Examples 1-3 were determined using the following methods:

[0057] (1) Take 19 SPCC cold-rolled steels with a rust grade of D and similar mass, each measuring 50mm*50mm*2mm. Record the mass of the cold-rolled steel as a and the surface area as s. Immerse them in a water-diluted degreasing and rust-removing surfactant for 45 minutes, then clean and dry them. Record the mass of the cold-rolled steel as b. Calculate the rust removal rate (g·h) according to the formula: rust removal rate = (ab) / (s·0.75h). -1 ·m -2 (See Table 2).

[0058] (2) Take 19 steel sheets of 45# steel, each 50mm*50mm*2mm in size, grind them, clean them with anhydrous ethanol, and dry them. Apply a mixture of No. 30 machine oil and petroleum jelly, prepared in a 1:3 weight ratio, to the surface of the steel sheets, ensuring that the mixture covers 80% of the steel sheet area. The amount of mixture applied is 0.3g. Clean the steel sheets coated with the mixture with a degreasing and rust-removing surfactant for 8 minutes, then clean them with distilled water for 3 minutes, and dry them. Calculate the degreasing rate by the weight difference before and after cleaning.

[0059] Table 2: Rust removal rate and degreasing rate of degreasing and rust removal surfactants

[0060]

[0061]

[0062] The following detailed description of this application is based on the experimental data provided in Table 1-2.

[0063] The degreasing and rust-removing surfactants provided in Examples 1-3 have a rust removal rate exceeding 350 g·h. -1 ·m -2 The degreasing rate is not less than 92%, indicating that the combined use of organic and inorganic acids in this application, along with the combined action of ethylenediaminetetraacetic acid tetrasodium, carboxymethyl cellulose sodium, and penetrant, is beneficial to improving the degreasing and rust-removing effect of the degreasing and rust-removing surfactant.

[0064] Using Example 2 as a control, Examples 4-5 investigated the effect of the amount of tetrasodium ethylenediaminetetraacetate (EDTA) on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 2 were both higher than those prepared in Examples 4-5. This indicates that the amount of tetrasodium ethylenediaminetetraacetate is a key factor affecting the rust removal and degreasing effect of the degreasing and degreasing surfactant.

[0065] Using Example 2 as a control, Examples 6-7 investigated the effect of the amount of sodium carboxymethyl cellulose on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 2 were both higher than those prepared in Examples 6-7. This indicates that the amount of sodium carboxymethyl cellulose is a key factor affecting the rust removal and degreasing effect of the degreasing and degreasing surfactant.

[0066] Using Example 2 as a control, Examples 8-9 investigated the effect of the ratio of sodium carboxymethyl cellulose to tetrasodium ethylenediaminetetraacetate on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 8 were higher than those prepared in Examples 6 and 9. This indicates that a ratio of sodium carboxymethyl cellulose to tetrasodium ethylenediaminetetraacetate of 5:3 is beneficial for improving the rust removal and degreasing effect of the degreasing and degreasing surfactant.

[0067] Using Example 8 as a control, Examples 10-11 investigated the effect of the amount of penetrant added on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 8 were both higher than those prepared in Examples 10-11. This indicates that the amount of penetrant added is a key factor affecting the rust removal and degreasing effect of the degreasing and degreasing surfactant.

[0068] Compared with Example 8, Example 12 investigated the effect of different penetrants on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 8 were both higher than those prepared in Example 12. This indicates that using isooctanol polyoxyethylene ether alone as a penetrant is more beneficial to improving the rust removal and degreasing effect of the degreasing and degreasing surfactant than using alkylphenol polyoxyethylene ether alone.

[0069] Using Example 8 as a control, Examples 13-15 investigated the effect of using a compound of isooctanol polyoxyethylene ether and alkylphenol polyoxyethylene ether as a penetrant on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Examples 13-15 were higher than those of the degreasing and degreasing surfactant prepared in Example 8. This indicates that using a compound of isooctanol polyoxyethylene ether and alkylphenol polyoxyethylene ether as a penetrant is more beneficial for improving the rust removal and degreasing effect of the degreasing and degreasing surfactant. Furthermore, the rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 14 were higher than those of the degreasing and degreasing surfactants prepared in Examples 13 and 15, indicating that a weight ratio of isooctanol polyoxyethylene ether to alkylphenol polyoxyethylene ether of 2:1 is beneficial for improving the rust removal and degreasing effect of the degreasing and degreasing surfactant.

[0070] Using Example 14 as a control, Example 16 investigated the effect of the preparation method of the degreasing and rust-removing surfactant on its degreasing and rust-removing effect. The degreasing and rust-removing surfactant prepared in Example 16 showed higher degreasing rates and rates than the surfactant prepared in Example 14. This indicates that mixing in multiple stages, and mixing components in smaller quantities separately from those in larger quantities, is beneficial for improving the degreasing and rust-removing effects of the surfactant.

[0071] Using Example 2 as a control, Comparative Examples 1-3 investigated the effects of not adding EDTA tetrasodium ethylenediaminetetraacetate and sodium carboxymethyl cellulose, as well as adding only one of them, on the rust removal and degreasing effect of the degreasing and degreasing surfactant. The rust removal rate and degreasing rate of the degreasing and degreasing surfactant prepared in Example 2 were significantly higher than those prepared in Comparative Examples 1-3. This indicates that the combined use of EDTA tetrasodium ethylenediaminetetraacetate and sodium carboxymethyl cellulose has a synergistic effect in improving the rust removal rate and degreasing rate of the degreasing and degreasing surfactant, greatly enhancing its rust removal and degreasing capabilities.

[0072] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A degreasing and rust-removing surfactant, characterized in that: Made from raw materials comprising the following weights: Organic acids: 75g; Tetrasodium ethylenediaminetetraacetate: 1.5g; Sodium carboxymethyl cellulose: 2.5g; Penetrant: 3g; Inorganic acid: 100g; Water: 500g; The penetrant is alkylphenol polyoxyethylene ether and isooctanol polyoxyethylene ether; the weight of the alkylphenol polyoxyethylene ether is 1g and the weight of the isooctanol polyoxyethylene ether is 2g. The organic acid is hydroxyethylidene diphosphonic acid; The inorganic acid is phosphoric acid.

2. A method for preparing a degreasing and rust-removing surfactant as described in claim 1, characterized in that: Includes the following steps: A degreasing and rust-removing surfactant is obtained by mixing a penetrant, inorganic acid, hydroxyethylidene diphosphonic acid, tetrasodium ethylenediaminetetraacetate, sodium carboxymethyl cellulose, and water.

3. The method for preparing a degreasing and rust-removing surfactant according to claim 2, characterized in that: The process of mixing the penetrant, inorganic acid, hydroxyethylidene diphosphonic acid, tetrasodium ethylenediaminetetraacetate, sodium carboxymethyl cellulose, and water includes the following steps: Divide the water into three parts. Mix the penetrant, sodium ethylenediaminetetraacetate, and sodium carboxymethyl cellulose with the first part of water to obtain a first mixture. Mix the inorganic acid and hydroxyethylidene diphosphonic acid with the second part of water to obtain a second mixture. Mix the first mixture, the second mixture, and the third part of water together. The weight ratio of the first part of water to the second part of water to the third part of water is 1:6:

3.

4. The method for preparing a degreasing and rust-removing surfactant according to claim 3, characterized in that: The process of mixing the first mixture, the second mixture, and the third part of water evenly includes the following steps: adding the first mixture to the second mixture while stirring and adding the third part of water.

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