A phosphorus-free liquid degreaser

Abstract

This application relates to a phosphorus-free liquid degreaser, which is composed of a solution obtained by mixing Agent A and Agent B in a ratio of 1:1; the raw materials and mass percentages of Agent A are as follows: 10% - 20% sodium hydroxide, 1% - 3% sodium gluconate, and the balance is deionized water; the raw materials and mass percentages of Agent B are as follows: 1% - 10% sodium dodecyl sulfate, 1% - 3% sodium lignosulfonate, 1% - 5% lauryl glucoside, 0.5% - 2.5% octylphenol polyoxyethylene ether, 1% - 5% tea brown pigment, 0.5% - 2.5% N-carboxymethyl chitosan, and the balance is deionized water.

Description

Technical Field

[0001] The present invention relates to the field of surface cleaning agents for metal materials, and particularly to a phosphorus-free liquid degreaser. Background Art

[0002] With the industrial upgrading of the steel industry, the requirements for the surface cleanliness of steel materials before processing are getting higher and higher. If the surface cleaning is not thorough, it will seriously affect the quality of subsequent processing techniques. Most traditional degreasers are phosphorus-containing powders. Since phosphorus is one of the important factors leading to water eutrophication, with the increasing intensity of environmental protection, phosphorus-free is the only way for the degreasing process. Due to the presence of dust in the degreasing powder, it will cause dust pollution during construction operations, which is harmful to the environment, especially the health of workers. During the use of existing degreasers, the degreasing effect is poor. After multiple water washes, there is still oil stain or degreaser residue on the surface, which affects the subsequent processes and wastes water resources. Summary of the Invention

[0003] The present invention is to solve the above technical problems existing in the prior art, and provides a phosphorus-free liquid degreaser with good degreasing effect, easy to clean, and capable of meeting subsequent processes, as well as its preparation method and application.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A phosphorus-free degreaser is composed of a solution formed by mixing Agent A and Agent B in a volume ratio of 1:1. The raw materials and mass percentages of Agent A are: sodium hydroxide 10% - 20%, sodium gluconate 1% - 3%, and the balance is deionized water; the raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 1% - 10%, sodium lignosulfonate 1% - 3%, lauryl glucoside 1% - 5%, octylphenol polyoxyethylene ether 0.5% - 2.5%, tea brown pigment 1% - 5%, N-carboxymethyl chitosan 0.5% - 2.5%, and the balance is deionized water.

[0006] As a further solution of the present invention: it is composed of a solution formed by mixing Agent A and Agent B in a volume ratio of 1:1. The raw materials and mass percentages of Agent A are: sodium hydroxide 12% - 18%, sodium gluconate 1.5% - 2.5%, and the balance is deionized water; the raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 3% - 9%, sodium lignosulfonate 1.5% - 2.5%, lauryl glucoside 2% - 4%, octylphenol polyoxyethylene ether 1% - 2%, tea brown pigment 1.5% - 3%, N-carboxymethyl chitosan 1.0% - 2.0%, and the balance is deionized water.

[0007] It consists of a solution formed by mixing Agent A and Agent B in a volume ratio of 1:1. The raw materials and mass percentages of Agent A are as follows: sodium hydroxide 15%, sodium gluconate 2%, and the balance is deionized water; the raw materials and mass percentages of Agent B are as follows: sodium dodecyl sulfate 7%, sodium lignosulfonate 2%, lauryl glucoside 3%, octylphenol polyoxyethylene ether 1.5%, theabrownin 2.5%, N-carboxymethyl chitosan 1.5%, and the balance is deionized water.

[0008] As a further aspect of the present invention: the preparation method of the phosphorus-free degreasing agent is as follows:

[0009] Agent A is carried out according to the following steps:

[0010] S1. Add the measured deionized water into the reaction vessel, heat it to 60-70 °C, and stir.

[0011] S2. Add the measured sodium hydroxide into the reaction vessel, maintain the temperature at 60-70 °C, and stir until it is fully dissolved.

[0012] S3. Add the measured sodium gluconate into the reaction vessel, maintain the temperature at 60-70 °C, stir until it is fully dissolved, and then cool to room temperature.

[0013] Agent B is carried out according to the following steps:

[0014] S11. Add the measured deionized water into the reaction vessel, heat it to 40-50 °C, and stir.

[0015] S12. Add the measured sodium dodecyl sulfate, sodium lignosulfonate, lauryl glucoside, octylphenol polyoxyethylene ether, theabrownin, and N-carboxymethyl chitosan into the reaction vessel in sequence, maintain the temperature at 40-50 °C, and stir. Add the next raw material after each raw material is fully dissolved.

[0016] S13. After adding all the raw materials and dissolving them, maintain the temperature at 40-50 °C, continue to stir for 0.5 hours, and then cool to room temperature.

[0017] By placing sodium dodecyl sulfate, sodium lignosulfonate, lauryl glucoside, octylphenol polyoxyethylene ether, theabrownin, and N-carboxymethyl chitosan and sodium hydroxide in Agent A and Agent B respectively and mixing them together during use, the storage time of Agent A and Agent B can be increased.

[0018] As a further aspect of the present invention: the application of a liquid degreasing agent is used for degreasing and oil removal treatment of steel parts at 30-55 °C, and the treatment method is immersion or spraying.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] (1) The preparation method of this phosphorus-free liquid degreaser is simple, and the preparation raw materials do not contain phosphorus elements, avoiding the eutrophication of water bodies after use;

[0021] (2) This phosphorus-free liquid degreaser is convenient to use, avoiding the impact of dust on the bodies of construction workers during use;

[0022] (3) Adding theabrownin and N-carboxymethyl chitosan can remove the Ca 2+ and Mg 2+ content in the oil solution, reduce the solution hardness, provide a good use environment for surfactants, improve the activity of surfactants. At the same time, theabrownin and N-carboxymethyl chitosan can improve the miscibility between different surfactants, quickly form micelles, and improve the surfactant activity; theabrownin and N-carboxymethyl chitosan themselves also have certain emulsifying properties and can also be used as surfactants. The above factors work together synergistically to improve the activity of surfactants, making the phosphorus-free liquid degreaser in this invention have high degreasing efficiency. Specific Embodiments

[0023] Next, specific embodiments will be used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0024] Example 1

[0025] This example provides a phosphorus-free degreaser, which is composed of a solution with a volume ratio of 1:1 of Agent A and Agent B.

[0026] The raw materials and mass percentages of Agent A are as follows: sodium hydroxide 10%, sodium gluconate 1.0%, sodium metasilicate pentahydrate 1.0%, and the balance is deionized water;

[0027] The raw materials and mass percentages of Agent B are as follows: sodium dodecyl sulfate 1%, sodium lignosulfonate 1%, lauryl glucoside 1%, octylphenol polyoxyethylene ether 0.5%, theabrownin 1.0%, N-carboxymethyl chitosan 0.5%, and the balance is deionized water.

[0028] Example 2

[0029] The difference between this example and Example 1 is that the raw materials and mass percentages of Agent A are as follows: sodium hydroxide 12%, sodium gluconate 1.5%, sodium metasilicate pentahydrate 2.0%, and the balance is deionized water;

[0030] The raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 3%, sodium lignosulfonate 1.5%, lauryl glucoside 2%, octylphenol polyoxyethylene ether 1.0%, theasinigrin 1.5%, N-carboxymethyl chitosan 1.0%, and the balance is deionized water.

[0031] Example 3

[0032] The difference between this example and Example 1 is that the raw materials and mass percentages of Agent A are: sodium hydroxide 15%, sodium gluconate 2.0%, sodium metasilicate pentahydrate 3.0%, and the balance is deionized water;

[0033] The raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 7%, sodium lignosulfonate 2.0%, lauryl glucoside 3.0%, octylphenol polyoxyethylene ether 1.5%, theasinigrin 2.5%, N-carboxymethyl chitosan 1.5%, and the balance is deionized water.

[0034] Example 4

[0035] The difference between this example and Example 1 is that the raw materials and mass percentages of Agent A are: sodium hydroxide 18%, sodium gluconate 2.5%, sodium metasilicate pentahydrate 4.0%, and the balance is deionized water;

[0036] The raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 9%, sodium lignosulfonate 2.5%, lauryl glucoside 4.0%, octylphenol polyoxyethylene ether 2.0%, theasinigrin 3.0%, N-carboxymethyl chitosan 2.0%, and the balance is deionized water.

[0037] Example 5

[0038] The difference between this example and Example 1 is that the raw materials and mass percentages of Agent A are: sodium hydroxide 20%, sodium gluconate 3.0%, sodium metasilicate pentahydrate 5.0%, and the balance is deionized water;

[0039] The raw materials and mass percentages of Agent B are: sodium dodecyl sulfate 10%, sodium lignosulfonate 3.0%, lauryl glucoside 5.0%, octylphenol polyoxyethylene ether 2.5%, theasinigrin 4.0%, N-carboxymethyl chitosan 2.5%, and the balance is deionized water.

[0040] Comparative Example 1

[0041] Compared with the components in Example 4, this comparative example does not contain theasinigrin and N-carboxymethyl chitosan.

[0042] The raw materials and mass percentages of Agent A are: sodium hydroxide 18%, sodium gluconate 2.5%, sodium metasilicate pentahydrate 4.0%, and the balance is deionized water;

[0043] The raw materials of Agent B and their mass percentages are: sodium dodecyl sulfate 9%, sodium lignosulfonate 2.5%, lauryl glucoside 4.0%, octylphenol polyoxyethylene ether 2.0%, and the balance is deionized water.

[0044] Comparative Example 2

[0045] Compared with the components in Example 4, this comparative example does not contain theabrownin.

[0046] The raw materials of Agent A and their mass percentages are: sodium hydroxide 18%, sodium gluconate 2.5%, sodium metasilicate pentahydrate 4.0%, and the balance is deionized water;

[0047] The raw materials of Agent B and their mass percentages are: sodium dodecyl sulfate 9%, sodium lignosulfonate 2.5%, lauryl glucoside 4.0%, octylphenol polyoxyethylene ether 2.0%, theabrownin 3.0%, N - carboxymethyl chitosan 2.0%, and the balance is deionized water.

[0048] Comparative Example 3

[0049] Compared with the components in Example 4, this comparative example does not contain N - carboxymethyl chitosan.

[0050] The raw materials of Agent A and their mass percentages are: sodium hydroxide 18%, sodium gluconate 2.5%, sodium metasilicate pentahydrate 4.0%, and the balance is deionized water;

[0051] The raw materials of Agent B and their mass percentages are: sodium dodecyl sulfate 9%, sodium lignosulfonate 2.5%, lauryl glucoside 4.0%, octylphenol polyoxyethylene ether 2.0%, N - carboxymethyl chitosan 2.0%, and the balance is deionized water.

[0052] Test Example

[0053] The test method for the oil removal rate is as follows: The test piece is polished with sandpaper, then rinsed with absolute ethanol, acetone, and deionized water respectively, and dried and weighed as m0. Then, grease is coated and weighed as m1; the test piece is degreased at 60°C for 10 min. After degreasing, the test piece is rinsed by swinging in deionized water and left standing in an oven at 40°C for 1 h, taken out and weighed as m2. The oil removal rate is calculated according to the following formula.

[0054]

[0055] The Zeta potential of the degreasing agents in the examples and comparative examples was measured using a Zeta potential analyzer, and the change in the absolute value of its Zeta potential (|Zeta potential|) was observed. |Zeta potential| reflects the stability of the solution system. The more stable the system, the better the dispersibility, the more difficult it is to form micelles, and the weaker the synergistic effect between the surfactants. The smaller the |Zeta potential|, the more unstable the system, the easier it is to form micelles, and the stronger the synergistic effect between the surfactants. The relationship between |Zeta potential| and the system stability is as follows: (1) 0 - 5 mV, micelles are formed rapidly; (2) 10 - 30 mV, the system starts to be unstable; (3) 30 - 40 mV, the stability is average; (4) 40 - 60 mV, the stability is good; (5) above 60 mV, the stability is good.

[0056] The degreasing rate and |Zeta potential| of each example are shown in the following table.

[0057] Table 1. Degreasing rate and |Zeta potential| data of examples

[0058]

[0059] From the above data, it can be seen that the degreasing agent prepared in this application has excellent degreasing effect. After adding theabrownin and N - carboxymethyl chitosan, it can reduce the |Zeta potential| when four surfactants, namely sodium dodecyl sulfate, sodium lignosulfonate, lauryl glucoside, and octylphenol polyoxyethylene ether, are used in combination, can rapidly form micelles, and improve the ability to remove oil stains.

[0060] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A phosphorus-free liquid degreaser, characterized in that: It is composed of a solution with a volume ratio of agent A to agent B of 1:1; The raw materials and mass percentages of agent A are: sodium hydroxide 10% - 20%, sodium gluconate 1% - 3%, and the balance is deionized water; The raw materials and mass percentages of agent B are: sodium dodecyl sulfate 1% - 10%, sodium lignosulfonate 1% - 3%, lauryl glucoside 1% - 5%, octylphenol polyoxyethylene ether 0.5% - 2.5%, tea brown pigment 1% - 5%, N - carboxymethyl chitosan 0.5% - 2.5%, and the balance is deionized water.

2. The phosphorus-free liquid degreaser according to claim 1, wherein: The raw materials and mass percentages of agent A are: sodium hydroxide 12% - 18%, sodium gluconate 1.5% - 2.5%, and the balance is deionized water; The raw materials and mass percentages of agent B are: sodium dodecyl sulfate 3% - 9%, sodium lignosulfonate 1.5% - 2.5%, lauryl glucoside 2% - 4%, octylphenol polyoxyethylene ether 1% - 2%, tea brown pigment 1.5% - 3%, N - carboxymethyl chitosan 1.0% - 2.0%, and the balance is deionized water.

3. The phosphorus-free liquid degreaser according to claim 2, characterized in that: The raw materials and mass percentages of agent A are: sodium hydroxide 15%, sodium gluconate 2%, and the balance is deionized water; The raw materials and mass percentages of agent B are: sodium dodecyl sulfate 7%, sodium lignosulfonate 2%, lauryl glucoside 3%, octylphenol polyoxyethylene ether 1.5%, tea brown pigment 2.5%, N - carboxymethyl chitosan 1.5%, and the balance is deionized water.

4. The preparation method of the phosphorus-free liquid degreasing agent according to any one of claims 1-3: characterized in that, The steps are as follows: Agent A is carried out according to the following steps: S1. Add the metered deionized water into the reaction vessel, heat it to 60 - 70 °C, and stir; S2. Add the metered sodium hydroxide into the reaction vessel, maintain the temperature at 60 - 70 °C, and stir until it is fully dissolved; S3. Add the metered sodium gluconate into the reaction vessel, maintain the temperature at 60 - 70 °C, stir until it is fully dissolved, and then cool it to room temperature; Agent B is carried out according to the following steps: S11. Add the metered deionized water into the reaction vessel, heat it to 40 - 50 °C, and stir; S12. Add the metered sodium dodecyl sulfate, sodium lignosulfonate, lauryl glucoside, octylphenol polyoxyethylene ether, tea brown pigment, and N - carboxymethyl chitosan into the reaction vessel in sequence, maintain the temperature at 40 - 50 °C, and stir. Add the next raw material after each raw material is fully dissolved; S13. After adding all the raw materials and dissolving them, maintain the temperature at 40 - 50 °C, continue to stir for 0.5 hours, and then cool it to room temperature.

5. The application of the phosphorus - free liquid degreasing agent according to any one of claims 1 - 3 in the preparation of degreasing products.

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