Multi-effect environment-friendly chelating cleaning agent and preparation method thereof

Abstract

The invention relates to the field of water treatment agents, and particularly discloses a multi-effect environment-friendly chelating cleaning agent and a preparation method thereof.The chelating cleaning agent is prepared from, by mass, 15-30% of chelating agent, 3-8% of nitrilotriacetic acid sodium salt, 1-2% of lauryl sodium sulfate, 2-6% of modified attapulgite, 1.5-5% of modified cyclodextrin and the balance water. The chelating cleaning agent disclosed by the invention is environment-friendly and multi-effect, has a better cleaning effect in the aspect of dirt removal of reverse osmosis membranes, nanofiltration membranes, pipeline equipment and the like, can effectively remove dirt and remove heavy metals, prolongs the service life of cleaned objects, and is high in cleaning efficiency and more thorough in cleaning.

Description

Technical Field

[0001] The invention relates to the field of water treatment agents, and specifically discloses a multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. Background Art

[0002] In the water treatment industry, many water treatment processes and pipeline equipment are often faced with various organic and inorganic pollution, including organic sediments generated by bacterial sludge, fungi, mold, etc., corrosion products of device pipelines and containers such as metal oxide and metal hydroxide pollution, calcium carbonate mineral scaling and heavy metal sulfate scaling, etc. If the above pollution cannot be cleaned and removed in time, it will seriously affect the normal operation of water treatment processes and pipeline equipment, not only increasing operating costs and equipment replacement costs, but also bringing safety hazards.

[0003] The invention patent with application number 201310587053.3 discloses a chelating cleaning agent, which is composed of the following formula composition and mass components: 12-20 parts of aminotriacetic acid, 15-20 parts of sodium bicarbonate, 10-30 parts of sodium peroxide pyrophosphate, 1 part of surfactant, 2-7 parts of EDTA sodium salt, 0.5 parts of corrosion inhibitor, 1-3 parts of pH regulator, and water is added to 100 parts. It is characterized by being able to chelate more metals and having strong biodegradability. It can be used to remove organic sludge and inorganic calcium scale in cooling water systems and is a high-quality cleaning agent.

[0004] However, sodium peroxide pyrophosphate can have adverse effects on the environment and human health, and the application of this chelating cleaning agent is single, and the cleaning effect on more complex dirt in water treatment, such as reverse osmosis membranes and nanofiltration membranes, may still be insufficient. At the same time, the descaling of different equipment, such as pipes, may not be cleaned thoroughly.

[0005] In view of this, it is particularly important to disclose a multi-effect and environmentally friendly chelating cleaning agent. Summary of the invention

[0006] In view of the defects of the prior art, the present invention provides a high-performance flame-retardant aluminum composite panel and a preparation method thereof. The chelating cleaning agent disclosed in the present invention is environmentally friendly and multi-effect, has a good cleaning effect in removing dirt from reverse osmosis membranes, nanofiltration membranes, pipeline equipment, etc., can effectively remove dirt and heavy metals, extend the service life of the cleaned objects, have high cleaning efficiency, and clean more thoroughly.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] On one hand, the present invention provides a multi-effect and environmentally friendly chelating cleaning agent, which comprises the following raw materials in percentage by mass: 15-30% of chelating agent, 3-8% of sodium nitrilotriacetic acid, 1-2% of sodium dodecyl sulfate, 2-6% of modified attapulgite, 1.5-5% of modified cyclodextrin, and the balance is water.

[0009] In some embodiments of the present invention, the chelating agent is hydroxyethylethylenediaminetriacetic acid trisodium salt.

[0010] The present invention uses specially selected trisodium hydroxyethylethylenediaminetriacetic acid and sodium nitrilotriacetic acid as the main components of the chelating cleaning agent to obtain a multi-effect cleaning agent which has a good chelating effect on calcium, magnesium, iron and other ions.

[0011] In some embodiments of the present invention, the preparation steps of the modified attapulgite are as follows:

[0012] (1) Preparation of pretreated attapulgite: Add attapulgite to toluene, disperse it by ultrasonic for 10 to 20 minutes, then add a silane coupling agent containing an amino group, heat it to 60 to 80° C., react for 8 to 12 hours, and dry it to obtain pretreated attapulgite;

[0013] (2) Preparation of modified attapulgite: chitosan and acetic acid solution are mixed, and the pretreated attapulgite of step (1) is added under stirring, and the mixture is stirred at room temperature for 30 to 60 minutes, dried, ground and sieved to obtain the modified attapulgite.

[0014] In some embodiments of the present invention, in step (2), the particle size of the modified attapulgite is 100-200 mesh.

[0015] Preferably, in step (2), the particle size of the modified attapulgite is 150 mesh.

[0016] In some embodiments of the present invention, in step (1), the amino group-containing silane coupling agent is 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane.

[0017] In some embodiments of the present invention, in step (1), the mass ratio of the attapulgite to the amino group-containing silane coupling agent is 1:(0.8-1).

[0018] Preferably, in step (1), the mass ratio of the attapulgite to the amino group-containing silane coupling agent is 1:0.9.

[0019] In some embodiments of the present invention, in step (2), the mass ratio of the chitosan to the pretreated attapulgite of step (1) is (0.2-0.7):1.

[0020] Preferably, in step (2), the mass ratio of the chitosan to the pretreated attapulgite of step (1) is 0.45:1.

[0021] Preferably, in step (2), the concentration of the acetic acid solution is 1-2 wt %.

[0022] Preferably, in step (2), the ratio of chitosan to 1-2 wt% acetic acid solution is (0.01-0.02) g:1 mL.

[0023] Further preferably, in step (1), the ratio of chitosan to 1-2 wt% acetic acid solution is 0.015 g:1 mL.

[0024] Preferably, the deacetylation degree of the chitosan is ≥ 90.0%.

[0025] The applicant pre-treated the attapulgite by introducing a silane coupling agent containing an amino group, and then added chitosan for modification. On the one hand, the adsorption capacity of the attapulgite was improved, especially for impurities such as heavy metals formed after cleaning and descaling. On the other hand, it is easy to disperse and peel off under the action of interlayer volume, which makes it have a larger specific surface area, which is beneficial to its large-area and stable adsorption of metal ions during the cleaning process, and unexpectedly improves the removal effect. It may be because its adsorption of metal ions has an enhanced fixation effect on the modified cyclodextrin embedding material. At the same time, the introduction of amino functional groups during silane coupling agent modification is beneficial to improving the stability of the modified attapulgite in water, which is also beneficial to the effectiveness of each component.

[0026] In some embodiments of the present invention, the preparation steps of the modified cyclodextrin are as follows:

[0027] 1) Preparation of pretreated cyclodextrin: add deionized water to a reactor, heat it to 50-70°C, add cyclodextrin and anhydrous ethanol under stirring, stir and mix, then stir at -30--10°C for 5-15min, then heat to reflux at a rate of 1-10°C / min, keep stirring for 10-20min, and cool to room temperature to obtain pretreated cyclodextrin;

[0028] 2) Preparation of modified cyclodextrin: N,N-dimethylformamide, the pretreated cyclodextrin in step 1) and 4-amino-2,3,5,6-tetrafluoropyridine are stirred and mixed, a catalyst is added, an inert atmosphere is introduced, and the mixture is reacted at 70-100° C. for 1-3 days, cooled to room temperature, separated, washed and dried to obtain the modified cyclodextrin.

[0029] Preferably, in step 1), the mass ratio of deionized water, cyclodextrin and anhydrous ethanol is (16-20):1:(4-8).

[0030] Further preferably, in step 1), the mass ratio of deionized water, cyclodextrin and anhydrous ethanol is 18:1:6.

[0031] In some embodiments of the present invention, in step 2), the mass ratio of the pretreated cyclodextrin in step 1) to 4-amino-2,3,5,6-tetrafluoropyridine is (1.5-2.5):1.

[0032] Preferably, in step 2), the mass ratio of the pretreated cyclodextrin in step 1) to 4-amino-2,3,5,6-tetrafluoropyridine is 2:1.

[0033] Preferably, in step 2), the catalyst is potassium carbonate.

[0034] The present invention further improves the activity of the original cavity structure and the flexibility of the chain segments by modifying the cyclodextrin, ensures the blending state of the cyclodextrin with various components, promotes the formation of a host-guest inclusion complex between the cyclodextrin and the organic impurities formed after cleaning and descaling, and at the same time, due to the introduction of a large number of ether bonds, the cyclodextrin also has a good embedding property between inorganic impurity particles. The formation of a stable inclusion complex can accelerate the removal process of various impurities formed after cleaning and descaling, and at the same time ensure the removal integrity, make the cleaning effect more thorough, and further improve the removal rate and removal effect of the chelating detergent.

[0035] On the other hand, the present invention also provides a method for preparing a multi-effect and environmentally friendly chelating cleaning agent, comprising the following steps: adding a chelating agent, sodium salt of nitrilotriacetic acid, sodium dodecyl sulfate, modified attapulgite, and modified cyclodextrin into water, stirring and mixing, and adjusting the pH to neutral to obtain the multi-effect and environmentally friendly chelating cleaning agent.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) The chelating cleaning agent disclosed in the present invention is environmentally friendly and multi-effective. It has a good cleaning effect in removing dirt from reverse osmosis membranes, nanofiltration membranes, pipeline equipment, etc. It can effectively remove dirt and heavy metals, extend the service life of the cleaned objects, have high cleaning efficiency, and clean more thoroughly.

[0038] (2) The present invention pre-treats the attapulgite by introducing a silane coupling agent containing an amino group, and then adds chitosan for modification. On the one hand, the adsorption capacity of the attapulgite is improved, especially for impurities such as heavy metals formed after cleaning and descaling. On the other hand, it is easy to disperse and peel off under the action of interlayer volume, which improves the adsorption of metal ions, enhances the fixation of the embedded material of modified cyclodextrin, and improves the removal effect. At the same time, the introduction of amino functional groups during silane coupling agent modification is beneficial to improving the stability of the modified attapulgite in water, and is also beneficial to the effectiveness of each component in the system.

[0039] (3) The present invention further improves the activity of the original cavity structure and the flexibility of the chain segments by modifying the cyclodextrin, thereby ensuring its blending state with various components, accelerating the removal process of various impurities formed after cleaning and descaling, ensuring the removal integrity, making the cleaning effect more thorough, and further improving the removal rate and removal effect of the chelating detergent. DETAILED DESCRIPTION

[0040] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0041] Unless otherwise specified, the reagents used below can be easily obtained from commercial companies, among which chitosan was purchased from Sinopharm Chemical Reagent Co., Ltd.

[0042] Preparation Example 1

[0043] The preparation steps of modified attapulgite are as follows:

[0044] (1) Preparation of pretreated attapulgite: 10 g of attapulgite was added to 30 mL of toluene, and ultrasonically dispersed for 15 min, and then 9 g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane was added, and the temperature was raised to 70° C. for reaction for 10 h, and dried to obtain pretreated attapulgite;

[0045] (2) Preparation of modified attapulgite: 0.15 g of chitosan and 10 mL of 1.5 wt% acetic acid solution were mixed, and 0.33 g of the pretreated attapulgite prepared in step (1) was added under stirring. The mixture was stirred at room temperature for 45 min, dried, and ground through a 150-mesh sieve to obtain modified attapulgite.

[0046] Preparation Example 2

[0047] The preparation steps of modified attapulgite are the same as those of Preparation Example 1, except that in step (1), the amount of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane added is 11 g.

[0048] Preparation Example 3

[0049] The preparation steps of modified attapulgite are the same as those of Preparation Example 1, except that in step (2), the amount of chitosan added is 0.25 g.

[0050] Preparation Example 4

[0051] The preparation steps of modified attapulgite are as follows: add 10 mL of 1.5 wt% acetic acid solution and 0.15 g of chitosan into a reactor, add 0.33 g of attapulgite under stirring, stir and mix at room temperature for 45 minutes, dry, grind through a 150 mesh sieve, and obtain modified attapulgite.

[0052] Preparation Example 5

[0053] The preparation steps of the modified attapulgite are the same as those in Preparation Example 1, except that the particle size of the modified attapulgite is 220 meshes.

[0054] Preparation Example 6

[0055] The preparation steps of modified cyclodextrin are as follows:

[0056] 1) Preparation of pretreated cyclodextrin: 180 mL of deionized water was added to a reactor, the temperature was raised to 60° C., 10 g of cyclodextrin and 60 mL of anhydrous ethanol were added under stirring, the mixture was stirred, and then stirred at -20° C. for 10 min, and then the temperature was raised to reflux at a rate of 5° C. / min, and then the mixture was kept stirred for 15 min, and then cooled to room temperature to obtain pretreated cyclodextrin;

[0057] 2) Preparation of modified cyclodextrin: 20 mL of N,N-dimethylformamide, 2 g of the pretreated cyclodextrin prepared in step 1) and 1 g of 4-amino-2,3,5,6-tetrafluoropyridine were stirred and mixed, 0.33 g of potassium carbonate was added, a nitrogen atmosphere was introduced, the mixture was reacted at 85° C. for 2 d, the mixture was cooled to room temperature, separated, washed and dried to obtain modified cyclodextrin.

[0058] Preparation Example 7

[0059] The preparation steps of modified cyclodextrin are the same as those of Preparation Example 6, except that in step 2), the amount of pretreated cyclodextrin added is 1 g.

[0060] Preparation Example 8

[0061] The preparation steps of modified cyclodextrin are the same as those of Preparation Example 6, except that in step 2), the amount of pretreated cyclodextrin added is 3 g.

[0062] Preparation Example 9

[0063] The preparation steps of modified cyclodextrin are as follows: 20 mL of N,N-dimethylformamide, 2 g of cyclodextrin and 1 g of 4-amino-2,3,5,6-tetrafluoropyridine are stirred and mixed, 0.33 g of potassium carbonate is added, a nitrogen atmosphere is introduced, the mixture is reacted at 85° C. for 2 days, the mixture is cooled to room temperature, and the modified cyclodextrin is obtained by separation, washing and drying.

[0064] Example 1

[0065] A multi-effect and environment-friendly chelating cleaning agent comprises the following raw materials in percentage by mass: 22.5% of trisodium salt of hydroxyethylethylenediaminetriacetic acid, 5.5% of sodium salt of nitrilotriacetic acid, 1.5% of sodium dodecyl sulfate, 4% of modified attapulgite, 3.25% of modified cyclodextrin, and the balance is water.

[0066] The preparation method of the multi-effect and environmentally friendly chelating cleaning agent of this embodiment comprises the following steps: adding trisodium salt of hydroxyethylethylenediaminetriacetic acid, sodium salt of nitrilotriacetic acid, sodium dodecyl sulfate, modified attapulgite, and modified cyclodextrin into water, stirring and mixing, and adjusting the pH to neutral to obtain a multi-effect and environmentally friendly chelating cleaning agent.

[0067] The modified attapulgite used in this example is obtained from Preparation Example 1, and the modified cyclodextrin used is obtained from Preparation Example 6.

[0068] Example 2

[0069] A multi-effect and environment-friendly chelating cleaning agent comprises the following raw materials in percentage by mass: 15% of trisodium salt of hydroxyethylethylenediaminetriacetic acid, 3% of sodium salt of nitrilotriacetic acid, 1% of sodium dodecyl sulfate, 2% of modified attapulgite, 1.5% of modified cyclodextrin, and the balance is water.

[0070] The preparation method of the multi-effect and environmentally friendly chelating cleaning agent in this embodiment is the same as that in Example 1.

[0071] The modified attapulgite used in this example is obtained from Preparation Example 1, and the modified cyclodextrin used is obtained from Preparation Example 6.

[0072] Example 3

[0073] A multi-effect and environment-friendly chelating cleaning agent comprises the following raw materials in percentage by mass: 30% of trisodium salt of hydroxyethylethylenediaminetriacetic acid, 8% of sodium salt of nitrilotriacetic acid, 2% of sodium dodecyl sulfate, 6% of modified attapulgite, 5% of modified cyclodextrin, and the balance is water.

[0074] The preparation method of the multi-effect and environmentally friendly chelating cleaning agent in this embodiment is the same as that in Example 1.

[0075] The modified attapulgite used in this example is obtained from Preparation Example 1, and the modified cyclodextrin used is obtained from Preparation Example 6.

[0076] Example 4

[0077] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified attapulgite used is obtained from Preparation Example 2.

[0078] Example 5

[0079] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified attapulgite used is obtained from Preparation Example 3.

[0080] Example 6

[0081] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified attapulgite used is obtained from Preparation Example 4.

[0082] Example 7

[0083] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified attapulgite used is obtained from Preparation Example 5.

[0084] Example 8

[0085] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified cyclodextrin used is obtained from Preparation Example 7.

[0086] Example 9

[0087] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified cyclodextrin used is obtained from Preparation Example 8.

[0088] Example 10

[0089] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that the modified cyclodextrin used is obtained from Preparation Example 9.

[0090] Comparative Example 1

[0091] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that an equal amount of attapulgite is used to replace the modified attapulgite.

[0092] Comparative Example 2

[0093] A multi-effect and environmentally friendly chelating cleaning agent and a preparation method thereof. The specific implementation method is the same as that of Example 1, except that cyclodextrin is used in equal amounts to replace modified cyclodextrin.

[0094] Performance Testing

[0095] The chelating cleaning agent prepared in the above Examples 1-10 and Comparative Examples 1-2 was used to clean the sample to be cleaned (Toray brackish water membrane TML20DA400 with severe fouling) at 37°C for 20 hours, and the weight and pressure of the sample before and after cleaning were tested, and the weight difference and pressure difference were calculated, weight difference = weight before cleaning - weight after cleaning, in kg; pressure difference = pressure before cleaning - pressure after cleaning, in MPa; the specific test results are shown in Table 1:

[0096] Table 1

[0097]

[0098] It can be seen from Table 1 that the chelating cleaning agents provided by Examples 1 to 3 of the present invention have high cleaning efficiency and significant effect.

[0099] By comparing Example 4 and Example 5 with Example 1, it can be seen that when the added amounts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane and chitosan for preparing modified attapulgite are changed respectively, the cleaning efficiency of the chelating detergent will decrease.

[0100] By comparing Example 6 with Example 1, it can be seen that when attapulgite is directly modified with chitosan, the modified attapulgite has poor stability in the system and is not conducive to the effectiveness of each component, thereby resulting in a decrease in the cleaning efficiency of the chelating detergent.

[0101] By comparing Example 7 with Example 1, it can be seen that when the particle size of the modified attapulgite changes, the cleaning efficiency of the chelating detergent decreases due to the weakening of the adsorption effect.

[0102] By comparing Example 8 and Example 9 with Example 1, it can be seen that when the amount of pretreated cyclodextrin added during the preparation of modified cyclodextrin is changed, the cleaning efficiency of the chelating detergent is reduced.

[0103] By comparing Example 10 with Example 1, it can be seen that when the modified cyclodextrin is prepared without a pretreatment step, the flexibility of the modified cyclodextrin segment is poor, which affects the blending distribution with other components, the embedding effect is not ideal, and the cleaning effect of the chelating detergent is reduced.

[0104] It can be seen from the comparison between Comparative Example 1 and Example 1 that when an equal amount of unmodified attapulgite is added to replace the modified attapulgite, the cleaning efficiency of the chelating detergent is reduced due to the influence of the dispersion effect.

[0105] It can be seen from the comparison between Comparative Example 2 and Example 1 that when an equal amount of unmodified cyclodextrin is added to replace the modified cyclodextrin, the cyclodextrin will be unevenly dispersed and have poor performance, which will further reduce the effect of subsequent modification and affect the cleaning effect.

[0106] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-effect and environmentally friendly chelating cleaning agent, characterized in that: The chelating cleaning agent comprises the following raw materials in percentage by mass: 15-30% of chelating agent, 3-8% of sodium nitrilotriacetic acid, 1-2% of sodium dodecyl sulfate, 2-6% of modified attapulgite, 1.5-5% of modified cyclodextrin, and the balance is water.

2. The multi-effect and environmentally friendly chelating cleaning agent according to claim 1, characterized in that: The chelating agent is trisodium hydroxyethylethylenediaminetriacetic acid.

3. The multi-effect and environmentally friendly chelating cleaning agent according to claim 1, characterized in that: The preparation steps of the modified attapulgite are as follows: (1) Preparation of pretreated attapulgite: Add attapulgite to toluene, disperse it by ultrasonic for 10 to 20 minutes, then add a silane coupling agent containing an amino group, heat it to 60 to 80° C., react for 8 to 12 hours, and dry it to obtain pretreated attapulgite; (2) Preparation of modified attapulgite: chitosan and acetic acid solution are mixed, and the pretreated attapulgite of step (1) is added under stirring, and the mixture is stirred at room temperature for 30 to 60 minutes, dried, ground and sieved to obtain the modified attapulgite.

4. A multi-effect and environmentally friendly chelating cleaning agent according to claim 3, characterized in that: In step (2), the particle size of the modified attapulgite is 100 to 200 meshes.

5. A multi-effect and environmentally friendly chelating cleaning agent according to claim 3, characterized in that: In step (1), the amino group-containing silane coupling agent is 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane.

6. A multi-effect and environmentally friendly chelating cleaning agent according to claim 3, characterized in that: In step (1), the mass ratio of the attapulgite to the amino group-containing silane coupling agent is 1:(0.8-1).

7. A multi-effect and environmentally friendly chelating cleaning agent according to claim 3, characterized in that: In step (2), the mass ratio of the chitosan to the pretreated attapulgite of step (1) is (0.2-0.7):

1.

8. A multi-effect and environmentally friendly chelating cleaning agent according to claim 1, characterized in that: The preparation steps of the modified cyclodextrin are as follows: 1) Preparation of pretreated cyclodextrin: add deionized water to a reactor, heat it to 50-70°C, add cyclodextrin and anhydrous ethanol under stirring, stir and mix, then stir at -30--10°C for 5-15min, then heat to reflux at a rate of 1-10°C / min, keep stirring for 10-20min, and cool to room temperature to obtain pretreated cyclodextrin; 2) Preparation of modified cyclodextrin: N,N-dimethylformamide, the pretreated cyclodextrin in step 1) and 4-amino-2,3,5,6-tetrafluoropyridine are stirred and mixed, a catalyst is added, an inert atmosphere is introduced, and the mixture is reacted at 70-100° C. for 1-3 days, cooled to room temperature, separated, washed and dried to obtain the modified cyclodextrin.

9. A multi-effect and environmentally friendly chelating cleaning agent according to claim 8, characterized in that: In step 2), the mass ratio of the pretreated cyclodextrin in step 1) to 4-amino-2,3,5,6-tetrafluoropyridine is (1.5-2.5):

1.

10. A method for preparing the multi-effect and environmentally friendly chelating cleaning agent according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: adding a chelating agent, sodium salt of nitrilotriacetic acid, sodium dodecyl sulfate, modified attapulgite and modified cyclodextrin into water, stirring and mixing, and adjusting the pH to be neutral to obtain the multi-effect and environmentally friendly chelating cleaning agent.

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