Phosphorus-free low-cod metal oil and wax removing powder, and preparation method and application thereof

Abstract

The present application relates to the technical field of metal surface cleaning, and more particularly to a phosphorus-free low COD metal oil and wax removing powder, a preparation method and application thereof, which comprises the following components in parts by mass: pearl alkali 5-10 parts, anhydrous sodium metasilicate 20-40 parts, soda ash 20-30 parts, PEG400MS (polyethylene glycol monostearate) 1-3 parts, OTE (alkyl amine ester) 0.5-2 parts, JEM (sodium alkylamino propionate) 1-2 parts, and penetrating hydrophilic agent 0.5-1 part. The metal oil and wax removing powder provided by the present application does not contain phosphorus components and uses a small amount of surfactant, effectively reduces the COD value of the system, is friendly to the environment, and has good hard water resistance, which indicates that the formula is suitable for different regions in the north and south and is not prone to product deterioration and other problems. The oil and wax removing powder is mainly suitable for representative metal workpieces such as stainless steel and brass, responds quickly to metal surface oil and wax removal, has simple operation process, low energy consumption, and no obvious corrosion phenomenon on the metal substrate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal surface cleaning, and particularly relates to a phosphorus-free low-COD metal oil and wax removing powder and a preparation method and application thereof. BACKGROUND

[0002] Metal materials play an important role in structural materials and functional materials due to their good plasticity, electrical conductivity and high strength. Stainless steel and brass, as representative metals with good corrosion resistance, strong decorative appearance and high cost performance, are widely used in fields such as architecture, marine vessels, electronics and electrical appliances, hardware and bathroom. However, during the production and application of stainless steel and brass, the surface of the metal is prone to be contaminated by various oil stains such as machine oil, lubricating oil and wax stains due to rolling, polishing and other treatments, thereby affecting the quality assurance of subsequent electroplating processes. Therefore, surface oil and wax removal cleaning is particularly important.

[0003] Most oil stains are high-grade fatty acid glycerides, which can react with alkali to form soap and then remove saponified oil stains. Therefore, alkali degreasing is a common degreasing cleaning method in metal processing plants. For non-saponified oil stains such as mineral oil, a small amount of surfactant can be added to the alkali to rely on its wetting, solubilizing, emulsifying and dispersing effects to separate the oil droplets from the interface, thereby achieving the effect of cleaning oil stains. Wax stains are mostly adsorbed on the metal surface by mechanical adsorption, intermolecular adsorption and electrostatic force adsorption. The main components of the wax stains are abrasive and paraffin, wax, stearic acid, fat, oleic acid and adhesive. The abrasive used for green wax on stainless steel is chromium oxide green fine powder, and the abrasive used for white wax on brass is calcium oxide fine powder. Traditional oil and wax removal agents generally use oleic acid and alcohol amine to reduce the adsorption force between oil stains and wax stains and the substrate according to the similar solubility principle, thereby achieving the effect of oil and wax removal. For example, Chinese patent CN110892094A discloses an oil and wax removal agent, a metal workpiece and an oil and wax removal method thereof. The main components of the oil and wax removal agent are dichloromethane, triethanolamine oleic acid soap, ethanol, alkyl polyglycoside, nonylphenol polyoxyethylene ether, corrosion inhibitor (triethanolamine, sodium benzoate, benzotriazole) and acid (hydrochloric acid, sulfuric acid, phosphoric acid). Although it can effectively remove oil and wax, dichloromethane used in the oil and wax removal agent is an organic solvent, which is not environmentally friendly. Although the use of oleic acid and alcohol amine has a certain effect on oil and wax removal, the use temperature generally needs to reach a high temperature of 70 DEG C or above, and generally needs to be under the condition of ultrasonic to block the adsorption of wax stains on the surface by mechanical force, so the energy consumption of the oil and wax removal agent is high.

[0004] In addition to the wax dissolving agent, the selection of surfactants is also crucial. Most existing oil and wax removers use fatty alcohol / alkyl phenol / isomeric alcohol polyoxyethylene ether or coconut fatty acid monoethanolamide as the functional surfactant in the system. For example, Chinese Patent CN 114540825 A discloses an oil and wax removal powder and a preparation method. It uses alkaline compounds, corrosion inhibitors, silicates, sodium dodecylbenzenesulfonate, fatty alcohol polyoxyethylene ether sulfosuccinic acid half ester disodium salt, fatty alcohol ethoxylate, coconut fatty acid monoethanolamide, etc. as surfactants to obtain an oil and wax removal powder for removing oil and wax from the surface of steel workpieces. Although these traditional surfactants have good oil and wax removal effect, their addition amount in the formula is large, which easily leads to excessive chemical oxygen demand (COD) of the oil and wax removal agent, thereby causing high pollution of wastewater discharge. SUMMARY

[0005] The present application aims to solve the problems of high cost and high pollution of existing oil and wax removal powder. The present application provides a phosphorus-free low-COD metal oil and wax removal powder, its preparation method and application. It is suitable for steel and brass metal workpieces and can quickly remove surface oil and wax stains. Compared with traditional oil and wax removal agents, the oil and wax removal powder has simple operation process, low energy consumption, excellent performance and green environmental protection.

[0006] To solve the above technical problems, the present application adopts the following technical solutions:

[0007] A phosphorus-free low-COD metal oil and wax removal powder, comprising: pearl alkali, anhydrous sodium metasilicate, soda ash, polyethylene glycol monostearate, alkyl amine ester, sodium alkylamino propionate, and penetrating hydrophilic agent.

[0008] The application creatively adds PEG400MS (polyethylene glycol monostearate), OTE (alkyl amine ester), JEM (sodium alkylamino propionate) and penetrating hydrophilic agent in the alkaline substance (pearl alkali, anhydrous sodium metasilicate, soda ash) for synergic proportioning. The pearl alkali and soda ash in the formula are used as the main saponification raw material to provide the alkalinity of the formula, the anhydrous sodium metasilicate is used as the builder to provide certain alkalinity and emulsifying power. The special structure of PEG400MS (polyethylene glycol monostearate) makes it the main wax dissolving agent in the formula, one end of which is hydroxyl and the other end is long carbon chain stearic acid, and the principle of its wax dissolving is also similar to the like dissolves the like, and the structure of the stearic acid chain promotes the dissolution of the wax stains and oil stains on the metal surface, and unlike the reported wax dissolving agents, the other end of the molecular chain is hydrophilic hydroxyl, which shows that the reagent has the hydrophilic and lipophilic ends of the surfactant, and it has the wetting and solubilizing properties. The surface tension of OTE alkyl amine ester is 33.6 mN / m, which can provide appropriate emulsifying properties for the system, and more importantly, it is used as the rust inhibitor in the formula, and the main principle of its rust prevention is that the reagent is a long carbon chain compound with polar groups of amino and ester groups, and the polar groups in the molecule are closely adsorbed on the metal surface by charge effect, and the non-polar group long carbon chain hydrocarbon is directed to the outside of the metal surface and is mutually soluble with the oil stains, so that the rust inhibitor molecules are arranged on the metal surface in a directional manner to form an adsorptive protective film, so that the metal is not eroded by water and oxygen. JEM is used as an amphoteric ion surfactant, and the surface tension thereof is 32.4 mN / m, which has good wetting and emulsifying properties, and also has good hard water resistance, so that the formula is generally applicable to the northern and southern regions. JEM is used as the main emulsifier in the formula, and it is synergistically emulsified with OTE to uniformly disperse the oil stains and wax stains in water, so that the cleaning is achieved.

[0009] Preferably, the components include the following mass parts: the pearl alkali 5-10 parts, the anhydrous sodium metasilicate 20-40 parts, the soda ash 20-30 parts, the polyethylene glycol monostearate 1-3 parts, the alkyl amine ester 0.5-2 parts, the sodium alkylamino propionate 1-2 parts, and the penetrating hydrophilic agent 0.5-1 part.

[0010] Preferably, the components include the following mass parts: the pearl alkali 5-10 parts, the anhydrous sodium metasilicate 20-40 parts, the soda ash 20-30 parts, the polyethylene glycol monostearate 1-3 parts, the alkyl amine ester 0.5-2 parts, the sodium alkylamino propionate 1-2 parts, and the penetrating hydrophilic agent 0.5-1 part.

[0011] Preferably, the polyethylene glycol monostearate includes PEG400MS; the alkyl amine ester includes OTE; the sodium alkylamino propionate includes JEM; and the penetrating hydrophilic agent includes one or more of acetylenic alcohol polyether ZY-1465, polyether polyol CF-60 and multi-branched alcohol modified polyether XT-100.

[0012] Preferably, the penetrating hydrophilic agent includes acetylenic alcohol polyether ZY-1465, polyether polyol CF-60, and the mass ratio is 1:1.

[0013] The penetrating hydrophilic agent is mainly polyether compound. The above formula has the ability of removing oil and wax, but if the penetrating hydrophilic agent is missing, the formula has low efficiency of removing oil and wax, and the dirt removal is not complete. ZY-1465 (acetylenic alcohol polyether), CF-60 (polyether polyol), and XT-100 (polybranched alcohol modified polyether) have similar surface tensions, which are about 30.8 mN / m. They all contain a large number of hydrophilic molecules, which can adsorb water molecules on one side and interact with water molecules on the other side, so as to make the surface tension of the metal surface lower and the wettability greatly improved. Meanwhile, ZY-1465 (acetylenic alcohol polyether) is a special polyether, and the carbon-carbon triple bond functional group makes the difference between dynamic surface tension and static surface tension small. Compared with the other two penetrating hydrophilic agents, it reaches the surface tension inflection point balance faster, which represents that it has a lower critical micelle concentration and has a greater advantage. The addition of OTS (alkyl amine ester), JEM (sodium alkyl amino propionate), and penetrating hydrophilic agent in the system greatly reduces the surface tension of the formula system, and the surface tension of the optimal formula is as low as 25.9 mN / m, which promotes the formula to play a good synergistic effect and achieves excellent oil and wax removal effect.

[0014] A preparation method of the above-mentioned phosphorus-free low-COD metal oil and wax removal powder, comprising the following steps:

[0015] (1) The pearl alkali, the anhydrous sodium metasilicate, and the soda ash are stirred uniformly to obtain a mixture A;

[0016] (2) The alkyl amine ester, the sodium alkyl amino propionate, the polyethylene glycol monostearate, and the penetrating hydrophilic agent are added to the mixture A under stirring (each reagent is added completely within 1-2 minutes), and then stirred uniformly to obtain the phosphorus-free low-COD metal oil and wax removal powder.

[0017] Preferably, in step (1), the specific operation of stirring uniformly includes stirring at 500-1000 rpm for 1-5 min, and the stirring is stopped until the particles are uniformly dispersed into step (2); in step (2), the specific operation of stirring uniformly includes stirring at 500-1000 rpm for 5-20 min, and the stirring is stopped until the particles are uniformly dispersed without obvious caking to obtain the phosphorus-free low-COD metal oil and wax removal powder.

[0018] The application of the above-mentioned phosphorus-free low-COD metal oil and wax removal powder is used for efficiently removing oil and wax stains on the metal surface without corrosion.

[0019] Preferably, the application comprises the following steps:

[0020] A, adding the phosphorus-free low COD metal oil and wax removing powder into water, mixing uniformly to prepare a working solution;

[0021] B, immersing the metal in the working solution to obtain an oil and wax removed metal piece.

[0022] Preferably, in step A, the mass fraction of the working solution comprises 10-30%; in step B, the immersion time comprises 10-30 min, and the temperature comprises 40-50℃.

[0023] In the test process, the metal piece used is generally a stainless steel or brass test piece with oil and wax stains, which is prepared by the following steps:

[0024] 1. immersing the stainless steel and brass test pieces in uniform green wax liquid and white wax liquid (the surface of the stainless steel is green wax, and the surface of the brass is white wax) respectively for 10-30 min, and drying at 80℃ for 30-60 min to obtain test piece 1 with wax stains;

[0025] 2. evenly applying 1-3 drops of waste engine oil on the surface of test piece 1, and placing for 1-2 h to obtain a stainless steel or brass workpiece with oil and wax stains.

[0026] An oil and wax removed metal piece obtained by the above application.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] 1. The present application provides a phosphorus-free low COD metal oil and wax removing powder, which has good synergistic effect, simple process, and low use temperature, and can be applied to stainless steel and brass metal hot immersion oil and wax removal.

[0029] 2. The present application uses PEG400MS (polyethylene glycol monostearate) as a wax dissolving agent, which has the following advantages compared with traditional oleic acid and triethanolamine: it effectively dissolves similar structures of wax stains and oil stains according to the principle of similar dissolves similar, has the properties of surfactant wetting and solubilizing, and the effective process for oil and wax removal under the reagent system is 40-50℃ immersion for several minutes, which greatly reduces energy consumption compared with traditional ultrasonic oil and wax removal at more than 70℃, and is more conducive to industrial application.

[0030] 3. The oil and wax removing agent formula of the present application uses OTE (alkyl amine ester), JEM (sodium alkylamino propionate), and polyether type penetration hydrophilic agent in a synergistic ratio, which enhances the penetration, wetting, and emulsifying properties of the metal surface, promotes fast and complete oil and wax removal of stainless steel and brass metal, and the synergistic effect of these materials greatly reduces the amount of surfactant in the system, thereby making the COD of the formula lower, which is more conducive to sewage discharge.

[0031] 4、The metal oil and wax removing powder provided by the present application does not contain phosphorus components and uses a small amount of surfactant, effectively reduces the COD value of the system, is friendly to the environment, and has good hard water resistance, which shows that the formula is suitable for different regions in the north and south and is not prone to product deterioration and other problems. The oil and wax removing powder is mainly suitable for representative metal workpieces such as stainless steel and brass, and has fast response, simple operation process, low energy consumption, and no obvious corrosion phenomenon on the metal substrate. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The functional reagents OTE (alkyl amine ester), JEM (sodium alkyl amino propionate), and permeable hydrophilic agent in the formula, as well as the surface tension test results of Example 5 and Comparative Example 7, are shown in the figure.

[0033] Figure 2 The dirt removal effect diagram of a stainless steel sheet containing green wax and oil dirt represented by Example 5 and Comparative Example 7 is shown in the figure.

[0034] Figure 3 The dirt removal effect diagram of a brass sheet containing white wax and oil dirt represented by Example 5 and Comparative Example 7 is shown in the figure.

[0035] Figure 4 The corrosion test diagram of a brass workpiece represented by Example 6, Comparative Example 5, and Comparative Example 7 is shown in the figure. DETAILED DESCRIPTION

[0036] In order to make the technical solutions of the present application easier to understand, the present application will be further described in detail below with reference to specific examples, so that those skilled in the art can better understand and implement the present application, but the examples are not limiting of the present application. Modifications or replacements of the methods, steps or conditions of the present application without departing from the spirit and essence of the present application shall fall within the scope of the present application. If not specifically indicated, the technical means used in the examples is the conventional means familiar to those skilled in the art.

[0037] Example 1

[0038] The present embodiment provides a phosphorus-free low-COD metal oil and wax removing powder, which comprises the following components by mass: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 1 part, OTE (alkyl amine ester) 0.5 parts, JEM (sodium alkyl amino propionate) 1 part, and ZY-1465 (acetylenic alcohol polyether) 0.5 parts.

[0039] The preparation method is as follows:

[0040] Sp1, the corresponding weight parts of pearl alkali, anhydrous sodium metasilicate, soda ash are added into a stirring tank to stir at 500-1000 rpm for 1-5 min to obtain a mixture A;

[0041] Sp2, OTE (alkyl amine ester), JEM (sodium alkylamino propionate), PEG400MS (polyethylene glycol monostearate) and ZY-1465 (acetylene alcohol polyether) are sequentially added into the stirring mixture A (each reagent is added for 1-2 min), and stirred at 500-1000 rpm for 5-20 min to obtain a phosphorus-free low-COD metal oil and wax removal powder.

[0042] The use method is as follows:

[0043] Sp1, the phosphorus-free low-COD metal oil and wax removal powder is added into water and mixed uniformly to prepare a 10% working solution;

[0044] Sp2, stainless steel or brass test pieces with oil and wax stains are immersed in the 40-50°C working solution for 10-30 min, which can effectively remove the stains on the metal surface without corrosion;

[0045] The preparation method of the stainless steel or brass test pieces with oil and wax stains comprises the following steps:

[0046] A. The stainless steel and brass test pieces are respectively immersed in uniform green wax liquid and white wax liquid for 10-30 min, and then dried at 80°C for 30-60 min to obtain test pieces 1 containing wax stains;

[0047] B. 1-3 drops of waste engine oil are evenly applied on the surface of the test pieces 1, and then deposited for 1-2 h to obtain stainless steel or brass workpieces containing oil and wax stains.

[0048] Example 2

[0049] The embodiment provides a phosphorus-free low-COD metal oil and wax removal powder, which comprises the following components in mass parts: 8 parts of pearl alkali, 30 parts of anhydrous sodium metasilicate, 25 parts of soda ash, 1 part of PEG400MS (polyethylene glycol monostearate), 0.5 part of OTE (alkyl amine ester), 1 part of JEM (sodium alkylamino propionate), and 0.5 part of CF-60 (polyether polyol).

[0050] The preparation method of the phosphorus-free low-COD metal oil and wax removal powder is the same as that in Example 1;

[0051] The use method of the phosphorus-free low-COD metal oil and wax removal powder is the same as that in Example 1.

[0052] Example 3

[0053] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 1 part, OTE (alkyl amine ester) 0.5 part, JEM (sodium alkylamino propionate) 1 part and XT-100 (polybranched alcohol modified polyether) 0.5 part.

[0054] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0055] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0056] Embodiment 4

[0057] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 0.5 part, JEM (sodium alkylamino propionate) 1 part and ZY-1465 (acetylenic alcohol polyether) 0.5 part.

[0058] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0059] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0060] Embodiment 5

[0061] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 2 parts, JEM (sodium alkylamino propionate) 2 parts, ZY-1465 (acetylenic alcohol polyether) 0.5 part and CF-60 (polyether polyol) 0.5 part.

[0062] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0063] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0064] Embodiment 6

[0065] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 2 parts, JEM (sodium alkylamino propionate) 2 parts, XT-100 (polybranched alcohol modified polyether) 1 part.

[0066] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0067] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0068] Embodiment 7

[0069] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 2 parts, JEM (sodium alkylamino propionate) 2 parts, ZY-1465 (acetylenic alcohol polyether) 0.5 part, XT-100 (polybranched alcohol modified polyether) 0.5 part.

[0070] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0071] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0072] Embodiment 8

[0073] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in mass parts: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 2 parts, JEM (sodium alkylamino propionate) 2 parts, ZY-1465 (acetylenic alcohol polyether) 0.5 part, CF-60 (polyether polyol) 0.5 part.

[0074] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0075] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0076] Embodiment 9

[0077] The embodiment provides a phosphorus-free low COD metal oil and wax removing powder, which comprises the following components in parts by mass: pearl alkali 8 parts, anhydrous sodium metasilicate 30 parts, soda ash 25 parts, PEG400MS (polyethylene glycol monostearate) 2 parts, OTE (alkyl amine ester) 2 parts, JEM (sodium alkylamino propionate) 2 parts, XT-100 (polybranched alcohol modified polyether) 0.5 part, and CF-60 (polyether polyol) 0.5 part.

[0078] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0079] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0080] Comparative example 1

[0081] The comparative example provides a phosphorus-free low COD metal oil and wax removing powder, which is different from the embodiment 1 only in that ZY-1465 (acetylenic alcohol polyether) 0.5 part is not introduced, and other raw materials and dosages are same as those in the embodiment 1.

[0082] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0083] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0084] Comparative example 2

[0085] The comparative example provides a phosphorus-free low COD metal oil and wax removing powder, which is different from the embodiment 2 only in that CF-60 (polyether polyol) is not introduced, and other raw materials and dosages are same as those in the embodiment 2.

[0086] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0087] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0088] Comparative example 3

[0089] The comparative example provides a phosphorus-free low COD metal oil and wax removing powder, which is different from the embodiment 3 only in that XT-100 (polybranched alcohol modified polyether) is not introduced, and other raw materials and dosages are same as those in the embodiment 3.

[0090] The preparation method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0091] The use method of the phosphorus-free low COD metal oil and wax removing powder is same as that in the embodiment 1.

[0092] Comparative example 4

[0093] The present comparative example provides a phosphorus-free low COD metal oil and wax removal powder, which is only different from Example 5 in that PEG400MS (polyethylene glycol monostearate) is not introduced, but 2 parts of a commonly used wax dissolving agent triethanolamine oleic acid soap is introduced, and other raw materials and amounts are the same as those in Example 5.

[0094] The preparation method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0095] The use method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0096] Comparative Example 5

[0097] The present comparative example provides a phosphorus-free low COD metal oil and wax removal powder, which is only different from Example 5 in that OTE (alkyl amine ester) is not introduced, but 0.5 parts of a commonly used rust inhibitor benzotriazole is introduced, and other raw materials and amounts are the same as those in Example 5.

[0098] The preparation method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0099] The use method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0100] Comparative Example 6

[0101] The present comparative example provides a phosphorus-free low COD metal oil and wax removal powder, which is only different from Example 5 in that JEM (sodium alkylamino propionate) is not introduced, but 2 parts of a commonly used surfactant alkylphenol polyoxyethylene ether OP-10 is introduced, and other raw materials and amounts are the same as those in Example 5.

[0102] The preparation method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0103] The use method of the phosphorus-free low COD metal oil and wax removal powder is the same as that in Example 1.

[0104] Comparative Example 7

[0105] The present comparative example uses a commercially available oil and wax removal powder suitable for hot dipping of stainless steel.

[0106] The use method of the commercially available oil and wax removal powder is the same as that in Example 1.

[0107] Example 1

[0108] Performance test

[0109] 1. Test materials: stainless steel and brass workpieces required for use in Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5, Comparative Example 6, Comparative Example 7.

[0110] 2. Test method:

[0111] (1) Oil removal performance test: The oil removal rate of the surfactant is determined by the test with JB / T 4323.2-2019 “Water-based metal cleaning agent” as a reference standard. First, the surface of the stainless steel / brass is cleaned with ethanol and distilled water respectively, dried and weighed as m1. The stainless steel sheet / brass sheet is immersed in a wax liquid at 50℃ for 10 min, and then placed in an oven at 85℃ for 30 min. After cooling, an appropriate amount of artificial oil stain is evenly applied on the surface of the stainless steel / brass, and after standing for 30 min, the oil stain accumulated at the lower end is scraped off and weighed as m2. Hot dipping oil removal and wax removal are carried out under certain process conditions for 30 min. After oil removal, the stainless steel sheet / brass sheet is dried for 20 min, and weighed as m3. The oil removal and wax removal rate η is calculated according to the following formula.

[0112]

[0113] (2) Corrosion resistance test: Since the stainless steel sheet is not easy to corrode in a short time, the corrosion of the brass workpiece is tested. The corrosion of the brass workpiece caused by the cleaning agent is tested by the weight method. 100 ml of the sample is placed in a container and heated to 60℃. The brass sheet is immersed in the sample for 6 h, and the weight change before and after immersion is recorded, and the corrosion rate is calculated. The corrosion rate formula is as follows: in the formula,

[0114]

[0115] Wherein x is the corrosion rate, %; m4 is the weight of the workpiece before immersion, g; m5 is the weight of the workpiece after immersion for 6 h, g.

[0116] (3) Chemical oxygen demand COD content: COD is an important indicator of water pollution degree. The larger the value, the more serious the pollution of organic matter in water. The COD value can be obtained by detecting the working solution with a water quality analyzer.

[0117] (4)Hard water resistance: 50 g of sample was dissolved in 950 g of pure water and heated to 65 °C, and stirred until completely dissolved, and then cooled to room temperature. 25 mL of the supernatant was poured into a 100 mL beaker, and an appropriate amount of artificial hard water was added and shaken, and then placed in a constant temperature water bath at 65 °C for 1 h. The sample was taken out, and after the sample cooled to room temperature and kept for 1 h, the volume of hard water before the sample appeared flocculation, precipitation and other phenomena was recorded. Artificial hard water was prepared by weighing 0.4 g of CaCl2 and adding 500 g of pure water and stirring until completely dissolved.

[0118] The hard water resistance value can be calculated according to the following formula:

[0119]

[0120] (5) Surface tension test: reducing the surface or interfacial tension of a solution is one of the most commonly measured properties of surfactant solutions. The surface tension of the sample was measured by an automatic interfacial tension meter at an ambient temperature of 20 ± 5 °C.

[0121] 3. Test results:

[0122] The oil and wax removal rates, brass corrosion rates, COD values of the formulations, and hard water resistance test results of the different examples and comparative examples are shown in Table 1.

[0123] Table 1 Performance test results of different examples and comparative examples

[0124]

[0125]

[0126] The present application provides a phosphorus-free low-COD metal oil and wax removal powder. In a high-temperature environment of 40-50 °C, on the basis of saponification reaction of alkaline substances, special wax dissolving agent PEG400MS (polyethylene glycol monostearate), double emulsifier JEM (sodium alkyl aminopropionate), OTE (alkyl amine ester), and polyether type penetration hydrophilic agent are added to promote the rapid dissolution, dispersion, and emulsification of oil stains and wax stains in the sample, thereby achieving the effect of cleaning the workpiece. As can be seen from Table 1, the stainless steel and brass workpieces in different proportions of examples and comparative examples have consistent rules, and the oil and wax removal rate in the cleaner in Example 5 is the highest, reaching an oil removal rate of 98-99%, which indicates that the oil and wax removal agent with this proportion has the best cleaning effect and should be considered as a better choice. Figure 1The surface tension test results of each raw material and Example 5, Comparative Example 7 are shown in the graph, and the data in the graph can also serve as favorable support for the superior cleaning power of Example 5. As can be seen from the graph, the surface tension of the OTE used in the present application is 33.6 mN / m, the surface tension of JEM is 32.4 mN / m, and the surface tension of the three penetrating hydrophilic agents is about 30.8 mN / m. Under the combined action of these agents, the surface tension of Example 5 (25.9 mN / m) is less than that of Comparative Example 7 (27.7 mN / m), which means that the surface contraction force of Example 5 is smaller, and it is easier for the same dirt to wet and spread on the solid surface under the same conditions, i.e., it is easier to clean and remove the dirt. At the same time, the accompanying Figure 2 , the accompanying Figure 3 The actual dirt removal effect of stainless steel and brass workpieces under the two oil removal powders of Example 5 and Comparative Example 7 (competitive product) is shown in the graph. It can be clearly seen from the graph that the oil stains and wax stains under the formula of Example 5 are almost completely removed, while there are still a lot of stains on the surface of the stainless steel and brass workpieces in Comparative Example 7. This more directly shows that the formula of the present application has a more excellent dirt removal effect. Moreover, the results of Comparative Examples 1-3 in Table 1 show that among the three polyether penetrating hydrophilic agents, ZY-1465 (acetylenic alcohol polyether) has a better effect. As mentioned above, ZY-1465 has a stable carbon-carbon triple bond in addition to the same polyether structure, which gives the system a lower critical micelle concentration and can wet the substrate surface faster. Comparative Example 4 and Example 5, and Comparative Example 6 and Example 5, respectively, compared the effects of triethanolamine oleic soap and PEG400MS as wax dissolving agents, and OP-10 and JEM as emulsifiers in the system. The test results show that the dirt removal rate of Example 5 is as high as 98-99%, which is much higher than the 88-90% of Comparative Example 4 and the 85-87% of Comparative Example 6, which shows that PEG400MS and JEM have a synergistic effect in the system, making the formula more effective.

[0127] The data on brass corrosion rate shows the importance of OTE (alkyl amine ester) rust inhibitor to the system. When OTE is not introduced into the system and a conventional benzotriazole is used for testing (Comparative Example 5), the corrosion rate increases slightly. The accompanying Figure 4The corrosion of the brass sheet is also visually demonstrated. It can be seen from the figure that the surface uniformity of Example 5 is the highest, almost no obvious corrosion, a few areas of the surface of Comparative Example 5 appear to fall off defects, and Comparative Example 7 has the most obvious defects, which is consistent with the corrosion rate data in Table 1, indicating that OTE (alkyl amine ester) has excellent corrosion resistance. The chemical oxygen demand COD is mainly related to the total amount of four reagents PEG400MS (polyethylene glycol monostearate), JEM (sodium alkyl aminopropionate), OTE (alkyl amine ester) and polyether type permeable hydrophilic agent. The greater the amount, the greater the COD value. The hard water resistance is mainly provided by JEM (sodium alkyl aminopropionate), the greater the amount, the greater the hard water resistance. In the table, JEM in Example 5, Example 6 and Comparative Example 5 is 2 parts, and the hard water resistance can reach 98.5 ppm, which is better than the value of 55.7 ppm of the competitor of Comparative Example 7.

[0128] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A phosphorus-free, low-COD metal degreasing and dewaxing powder, characterized in that, The product comprises the following components in parts by weight: 5-10 parts of sodium benzene, 20-40 parts of anhydrous sodium metasilicate, 20-30 parts of soda ash, 1-3 parts of polyethylene glycol monostearate, 0.5-2 parts of alkylamine ester, 1-2 parts of sodium alkylaminopropionate, and 0.5-1 part of polyether-based penetrating hydrophilic agent.

2. The phosphorus-free, low-COD metal degreasing and dewaxing powder as described in claim 1, characterized in that, The composition comprises the following components in parts by weight: 8 parts of the beaded alkali, 30 parts of the anhydrous sodium metasilicate, 25 parts of the soda ash, 2 parts of the polyethylene glycol monostearate, 2 parts of the alkylamine ester, 2 parts of the sodium alkylaminopropionate, and 1 part of the polyether-based penetrating hydrophilic agent.

3. The phosphorus-free, low-COD metal degreasing and dewaxing powder as described in claim 1, characterized in that, The polyethylene glycol monostearate includes PEG400MS; the alkylamine ester includes OTE; the sodium alkylaminopropionate includes JEM; and the polyether-based penetrating hydrophilic agent includes one or more of alkynyl alcohol polyether ZY-1465, polyether polyol CF-60, and multi-branched alcohol modified polyether XT-100.

4. A method for preparing the phosphorus-free, low-COD metal degreasing and dewaxing powder as described in claim 1, characterized in that, Includes the following steps: (1) Add the beaded alkali, the anhydrous sodium metasilicate, and the soda ash and stir until homogeneous to obtain mixture A; (2) While maintaining the stirring state, add the alkylamine ester, the sodium alkylaminopropionate, the polyethylene glycol monostearate, and the polyether-based penetrating hydrophilic agent to the mixture A, stir evenly, and obtain the phosphorus-free, low-COD metal degreasing and dewaxing powder.

5. The preparation method according to claim 4, characterized in that, In step (1), the specific operation of stirring evenly includes: stirring at 500~1000 rpm for 1~5 min until the particles of different sizes are uniform and then proceeding to step (2); In step (2), the specific operation of stirring evenly includes: stirring at 500~1000 rpm for 5~20 min until the particles of different sizes are evenly dispersed and there is no obvious clumping, thus obtaining the phosphorus-free low COD metal degreasing and dewaxing powder.

6. An application of the phosphorus-free, low-COD metal degreasing and dewaxing powder as described in claim 1, characterized in that, Used to effectively remove oil and wax stains from metal surfaces.

7. The application as described in claim 6, characterized in that, Includes the following steps: A. Add the phosphorus-free, low-COD metal degreasing and dewaxing powder to water, mix well, and prepare a working solution; B. Immerse the metal in the working fluid to obtain a degreased and dewaxed metal part.

8. The application as described in claim 7, characterized in that, In step A, the mass fraction of the working solution is 10-30%; in step B, the soaking time is 10-30 minutes and the temperature is 40-50°C.

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