Efficient metal cleaning agent and preparation method thereof

Abstract

The invention discloses an efficient metal cleaning agent and a preparation method thereof, and belongs to the technical field of chemical cleaning agents, and the efficient metal cleaning agent comprises the following components in parts by weight: 10-18 parts of builder, 4-15 parts of surfactant, 0.2-0.8 part of solubilizer, 1-1.5 parts of corrosion inhibitor, 0.2-0.5 part of antirust agent, 1-2 parts of complexing agent, 0.2-0.8 part of preservative, 0.5-1.5 parts of potassium alkylolamide phosphate and 0.5-1 part of defoaming agent. And the balance of deionized water. According to the surface active agent, N-(2-aminoethyl)-3-aminopropyl tetrasiloxane, D-(+)-gluconic acid delta-lactone, epoxy chloropropane, glycerol and the like are used as raw materials, and the obtained metal cleaning agent has good defoaming capacity and deoiling cleaning capacity, meets the requirements in metal cleaning and is high in practicability.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical cleaning agents, and in particular relates to a high-efficiency metal cleaning agent and a preparation method thereof. Background Art

[0002] With the development of industrial economy, the types of industrial cleaning have gradually expanded to metal processing, food, textile, transportation, shipbuilding, medical, electroplating, printing, automobile manufacturing, instrumentation, electronics and other industrial fields. Among them, metal cleaning in the metal processing field will have fingerprints, dust, processing oil, cutting fluid, grease and other organic and inorganic solid particles attached to the surface of parts, which will corrode and wear the parts. Therefore, after the parts are processed, efficient cleaning agents are needed to remove these impurities remaining on the metal surface. Efficient metal cleaning agents include solvent-based cleaning agents and water-based cleaning agents. Among them, solvent-based cleaning agents include gasoline, kerosene, trichloroethylene, methylene chloride, Freon, etc. These solvent-based cleaning agents have more or less problems such as being flammable and explosive, highly toxic, destroying atmospheric ozone, and requiring solvent recovery and treatment. Since strong alkaline cleaning agents may cause metals to lose gloss, discolor, or even corrode, water-based cleaning agents used for non-ferrous metal parts are mainly neutral or very weak alkaline cleaning agents. Currently, the commonly used water-based metal cleaning agents are prone to foaming and residue. After the foam overflows, a large amount of surfactant is taken away, shortening the life of the cleaning agent. For example, Chinese patent CN105525303A discloses a metal cleaning agent that has a strong dispersing and anti-fouling ability by compounding a new organic surfactant and a mixture of fatty alcohol polyoxyethylene ether and fatty acid methyl ester ethoxylate as an emulsifier, but its defoaming ability is weak, and most of the foam is relatively large and difficult to remove, affecting its use efficiency. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency metal cleaning agent and a preparation method thereof, so as to solve the problem that the existing metal cleaning agents have weak defoaming ability and result in low production efficiency.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A method for preparing a high-efficiency metal cleaning agent comprises the following components in parts by weight: 10-18 parts of a builder, 4-15 parts of a surfactant, 0.2-0.8 parts of a solubilizer, 1-1.5 parts of a corrosion inhibitor, 0.2-0.5 parts of a rust inhibitor, 1-2 parts of a complexing agent, 0.2-0.8 parts of a preservative, 0.5-1.5 parts of potassium salt of alkyl alcohol amide phosphate, 0.5-1 parts of an organosilicon defoamer, and the balance is deionized water.

[0006] Further, the surfactant is prepared by the following steps:

[0007] Step 1, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, hexamethyldisiloxane and tetramethylammonium hydroxide are mixed, first stirred at 85-95° C. for 2-4 hours under a nitrogen atmosphere, then heated at 120-135° C. for 30-60 minutes, excess hexamethyldisiloxane is distilled off, and fractional distillation is performed to purify to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane;

[0008] Step 2, mixing N-(2-aminoethyl)-3-aminopropyltetrasiloxane, D-(+)-gluconic acid δ-lactone and anhydrous methanol solvent, heating at 40-60° C. for 8-10 h, cooling, evaporating, washing with hexane, and drying to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine;

[0009] Step 3, place N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine in a flask, add epichlorohydrin, stir at 55-80° C. for 6-8 hours, filter and vacuum dry to obtain an intermediate;

[0010] Step 4: Place propylene glycol and the intermediate in a flask and stir for 5-8 hours at a reaction temperature of 70-80° C., recrystallize, and vacuum dry to obtain a surfactant.

[0011] Furthermore, in step 1, the molar ratio of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, hexamethyldisiloxane and tetramethylammonium hydroxide is 1:15-20:0.1-0.2; in step 2, the molar ratio of N-(2-aminoethyl)-3-aminopropyltetrasiloxane and D-(+)-glucono delta-lactone is 1.8-2.4-1 mol; in step 3, the molar ratio of N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine and epichlorohydrin is 1:1-1.4; in step 4, the molar ratio of glycerol to the intermediate is 1-1.2:1.

[0012] Furthermore, the builder comprises the following components in parts by weight: 6-11 parts of tripolyphosphate and 4-7 parts of industrial silicate.

[0013] Furthermore, the solubilizing agent comprises alkenyl succinate glycoside.

[0014] Furthermore, the corrosion inhibitor includes one or more of EDTA, benzotriazole, hexamethylenetetramine, mercaptobenzotriazole and thiourea.

[0015] Furthermore, the rust inhibitor includes one or more of monoethanolamine and triethanolamine.

[0016] Furthermore, the complexing agent includes disodium ethylenediaminetetraacetate.

[0017] Furthermore, the defoaming agent includes one or more of octanol, mineral oil, and tributyl phosphate.

[0018] Furthermore, the builder, surfactant, solubilizer, corrosion inhibitor, rust inhibitor, complexing agent, preservative, alkyl alcohol amide phosphate potassium salt, defoamer and deionized water are mixed to obtain a metal cleaning agent.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention provides a high-efficiency metal cleaning agent and a preparation method thereof. A surfactant is prepared from raw materials such as N-(2-aminoethyl)-3-aminopropyltetrasiloxane, D-(+)-glucono delta-lactone, epichlorohydrin and glycerol. The surfactant is matched with each component to obtain a metal cleaning agent having good defoaming ability and degreasing cleaning ability, meeting the needs in metal cleaning and having strong practicality.

[0021] 3. The present invention uses chemical means to open the N-(2-aminoethyl)-3-aminopropyltetrasiloxane and D-(+)-gluconic acid δ-lactone having an active amino group and a S iOS i structure into a hydrophilic group having a sugar group, and the obtained N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine reacts with epichlorohydrin and glycerol to obtain a hydrophilic group of a polyether. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] A surfactant is prepared by the following steps:

[0025] Step 1, 1 mol of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 15 mol of hexamethyldisiloxane and 0.1 mol of tetramethylammonium hydroxide are mixed, first stirred at 85-95° C. for 2 h under a nitrogen atmosphere, then heated at 120° C. for 30 min, excess hexamethyldisiloxane is distilled off, and fractionated and purified to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane;

[0026] Step 2, 1.8 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane, 1 mol D-(+)-gluconic acid δ-lactone, and 50 mL of anhydrous methanol solvent were mixed, heated at 40° C. for 8 h, cooled, evaporated, washed with 20 mL of hexane, and dried to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine;

[0027] Step 3, put 1 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine into a flask, add 1 mol epichlorohydrin, stir at 55° C. for 6 h, filter and vacuum dry to obtain an intermediate;

[0028] Step 4: Place 1 mol of propylene glycol and 1 mol of the intermediate into a flask and stir for 5 hours at a reaction temperature of 70°C. Recrystallize and dry in vacuo to obtain a surfactant.

[0029] Example 2

[0030] A surfactant is prepared by the following steps:

[0031] Step 1, 1 mol of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 20 mol of hexamethyldisiloxane and 0.2 mol of tetramethylammonium hydroxide are mixed, first stirred at 95° C. for 4 hours under a nitrogen atmosphere, then heated at 135° C. for 60 minutes, excess hexamethyldisiloxane is distilled off, and fractional distillation is performed to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane;

[0032] Step 2, 2.4 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane, 1 mol D-(+)-gluconic acid δ-lactone, and 50 mL of anhydrous methanol solvent were mixed, heated at 60° C. for 10 h, cooled, evaporated, washed with 20 mL of hexane, and dried to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine;

[0033] Step 3, put 1 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine into a flask, add 1.4 mol epichlorohydrin, stir at 80° C. for 8 h, filter and vacuum dry to obtain an intermediate;

[0034] Step 4: Put 1.2 mol propylene glycol and 1 mol intermediate into a flask and stir for 8 hours at a reaction temperature of 80°C. Recrystallize and vacuum dry to obtain a surfactant.

[0035] Example 3

[0036] A surfactant is prepared by the following steps:

[0037] Step 1, 1 mol of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, 18 mol of hexamethyldisiloxane and 0.15 mol of tetramethylammonium hydroxide are mixed, first stirred at 90° C. for 3 h under a nitrogen atmosphere, then heated at 130° C. for 40 min, excess hexamethyldisiloxane is distilled off, and fractionated and purified to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane;

[0038] Step 2, 2.2 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane, 1 mol D-(+)-gluconic acid δ-lactone, and 50 mL of anhydrous methanol solvent were mixed, heated at 50° C. for 9 h, cooled, evaporated, washed with 20 mL of hexane, and dried to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine;

[0039] Step 3, put 1 mol N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine into a flask, add 1.2 mol epichlorohydrin, stir at 70°C for 7h, filter and vacuum dry to obtain an intermediate;

[0040] Step 4: Put 1.1 mol propylene glycol and 1 mol intermediate into a flask and stir for 6 hours at a reaction temperature of 75°C. Recrystallize and vacuum dry to obtain a surfactant.

[0041] Example 4

[0042] 6 g of tripolyphosphate, 4 g of industrial silicate, 4 g of the surfactant in Example 2, 0.2 g of alkenyl succinate glycoside, 1 g of benzotriazole, 0.2 g of triethanolamine, 1 g of disodium ethylenediaminetetraacetic acid, 0.2 g of preservative, 0.5 g of potassium salt of alkyl alcohol amide phosphate, 0.5 g of tributyl phosphate, and the balance being deionized water, are mixed to obtain a metal cleaning agent.

[0043] Example 5

[0044] 11 g of tripolyphosphate, 7 g of industrial silicate, 15 g of the surfactant in Example 2, 0.8 g of alkenyl succinate glycoside, 1.5 g of benzotriazole, 0.5 g of triethanolamine, 2 g of disodium ethylenediaminetetraacetic acid, 0.8 g of preservative, 1.5 g of potassium salt of alkyl alcohol amide phosphate, 1 g of tributyl phosphate, and the balance being deionized water, are mixed to obtain a metal cleaning agent.

[0045] Example 6

[0046] 10 g of tripolyphosphate, 6 g of industrial silicate, 8 g of the surfactant in Example 1, 0.6 g of alkenyl succinate glycoside, 1.2 g of benzotriazole, 0.4 g of triethanolamine, 1.8 g of disodium ethylenediaminetetraacetic acid, 0.6 g of preservative, 1.4 g of potassium salt of alkyl alcohol amide phosphate, 0.6 g of tributyl phosphate, and the balance being deionized water are mixed to obtain a metal cleaning agent.

[0047] Comparative Example 1

[0048] On the basis of Example 5, the surfactant in Example 5 is replaced by a carboxybetaine type amphoteric surfactant, and its raw materials and preparation process are the same as those in Example 5.

[0049] The metal cleaning agents obtained in Examples 4 to 6 and Comparative Example 1 were subjected to performance tests. According to the prepared cleaning agent samples and 5% (prepared with distilled water) working solutions thereof, 30 mL of the working solution was transferred into a 100 mL measuring cylinder with a stopper, and the cylinder was immediately shaken up and down at room temperature (20°C) for 1 min. The shaking distance was about 0.33 m, and the frequency was about 100-110 times / min. After shaking, the cylinder stopper was opened, and the cylinder was placed in a freezer / water bath for 10 min. The time for the foam to disappear was observed and recorded.

[0050] The cleaning rate is tested by this method: immerse the treated and weighed test piece (the weight is m0) into the pre-heated artificial oil stain, immerse at room temperature for more than 5 minutes, and when the test piece is at the same temperature as the oil, lift the test piece and hang it on the test piece rack to drain for 20 minutes, scrape off the oil droplets gathered at the bottom of the test piece, and weigh it together with the hook (the weight is m1). Fix the oil-immersed and weighed test piece on the swing washing machine with a hook, immerse it in 3 500mL, (65±2)℃ test solution swing tanks respectively, record the time immediately, soak for 3 minutes, swing wash for 3 minutes, take out the test piece, and then swing wash 10 times in (65±2)℃ distilled water. Take out the test piece and immediately dry it in an oven at (70±2)℃ for 30-40 minutes, take it out and cool it to room temperature and weigh it again (the weight is m2), where the cleaning rate X is calculated according to the formula, X=(m1-m2) / (m1-m0). The test results are shown in Table 1:

[0051] Table 1

[0052]

[0053] It can be seen from Table 1 that, compared with Comparative Example 1, the metal cleaning agents obtained in Examples 4-6 have higher cleaning rates, all exceeding 99%, indicating strong degreasing ability; and the foam height is lower, the foam disappears in a shorter time, and has better defoaming ability.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a high-efficiency metal cleaning agent, characterized in that: The invention comprises the following components in parts by weight: 10-18 parts of a builder, 4-15 parts of a surfactant, 0.2-0.8 parts of a solubilizer, 1-1.5 parts of a corrosion inhibitor, 0.2-0.5 parts of a rust inhibitor, 1-2 parts of a complexing agent, 0.2-0.8 parts of a preservative, 0.5-1.5 parts of potassium salt of alkyl alcohol amide phosphate, 0.5-1 parts of a defoaming agent, and the balance is deionized water.

2. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: Surfactants are prepared by the following steps: Step 1, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, hexamethyldisiloxane and tetramethylammonium hydroxide are mixed, first stirred at 85-95° C. for 2-4 hours under a nitrogen atmosphere, then heated at 120-135° C. for 30-60 minutes, excess hexamethyldisiloxane is distilled off, and fractional distillation is performed to purify to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane; Step 2, mixing N-(2-aminoethyl)-3-aminopropyltetrasiloxane, D-(+)-gluconic acid δ-lactone and anhydrous methanol solvent, heating at 40-60° C. for 8-10 h, cooling, evaporating, washing with hexane, and drying to obtain N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine; Step 3, place N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucosamine in a flask, add epichlorohydrin, stir at 55-80° C. for 6-8 hours, filter and vacuum dry to obtain an intermediate; Step 4: Place propylene glycol and the intermediate in a flask and stir for 5-8 hours at a reaction temperature of 70-80° C., recrystallize, and vacuum dry to obtain a surfactant.

3. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: In step 1, the molar ratio of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, hexamethyldisiloxane and tetramethylammonium hydroxide is 1:15-20:0.1-0.2; in step 2, the molar ratio of N-(2-aminoethyl)-3-aminopropyltetrasiloxane-N-glucamine and epichlorohydrin is 1:1-1.2; in step 3, the molar ratio of glycerol and the intermediate is 1-1.2:

1.

4. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The builder comprises the following components in parts by weight: 6-11 parts of tripolyphosphate and 4-7 parts of industrial silicate.

5. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The solubilizing agent includes alkenyl succinate glycosides.

6. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The corrosion inhibitor includes one or more of EDTA, benzotriazole, hexamethylenetetramine, mercaptobenzotriazole and thiourea.

7. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The rust inhibitor includes one or more of monoethanolamine and triethanolamine.

8. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The complexing agent includes disodium ethylenediaminetetraacetate.

9. The method for preparing a high-efficiency metal cleaning agent according to claim 1, characterized in that: The defoaming agent includes one or more of octanol, mineral oil and tributyl phosphate.

10. A method for preparing the metal cleaning agent according to any one of claims 1 to 9, characterized in that: The builder, surfactant, solubilizer, corrosion inhibitor, rust inhibitor, complexing agent, preservative, alkyl alcohol amide phosphate potassium salt, defoamer and deionized water are mixed to obtain a metal cleaning agent.

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