Carbon hydrogen cleaning agent for capacitor shell, preparation method and use method thereof

Abstract

The present invention provides a hydrocarbon cleaning agent for capacitor shells, a preparation method and a method of using the same. The hydrocarbon cleaning agent for capacitor shells of the present invention comprises, by weight, 45 to 80 parts of hydrocarbon compounds, 10 to 25 parts of monoalcohol ether compounds, 5 to 20 parts of polyalcohol ether compounds and 1 to 10 parts of polyester compounds, wherein the monoalcohol ether compounds include propylene glycol butyl ether, the polyalcohol ether compounds include dipropylene glycol dimethyl ether, and the polyester compounds include ethylene glycol diacetate. The present invention can effectively remove zinc stearate on the surface of the capacitor shell and carbon black substances generated by the decomposition of zinc stearate at high temperature during the stretching process through the synergistic coordination between the above-mentioned preparation raw materials, and make the surface of the capacitor shell workpiece smooth and not dry after cleaning.

Description

Technical Field

[0001] The invention relates to the technical field of cleaning agents, and in particular to a hydrocarbon cleaning agent for a capacitor shell, a preparation method and a use method thereof. Background Art

[0002] The capacitor shell is generally made of aluminum alloy materials. During the stretching process, zinc stearate is often added as a lubricant. However, during the stretching process, the zinc stearate will liquefy due to the high temperature, and zinc stearate will decompose at high temperature to produce darker carbon black substances. Therefore, after the capacitor shell is stretched, the zinc stearate will decompose into carbon black substances and remain on the workpiece. The presence of carbon black substances will affect subsequent processing, spraying and other processes, and has a great impact on the product's pass rate, and even create a risk of explosion during loading. Therefore, the zinc stearate remaining on the surface of the capacitor shell and the carbon black substances produced under its high temperature conditions must be cleaned.

[0003] Existing hydrocarbon cleaning agents often add surfactants and other additives to ensure their cleaning effect. Although the addition of surfactants and other additives can significantly improve the cleaning effect, the surface of the capacitor shell workpiece will be rough and dry after cleaning. In actual working conditions, the capacitor shell workpiece will be placed on a plate by an automatic plate placing machine after cleaning. During the automatic plate placing process, the rough and dry surface of the capacitor shell workpiece after cleaning will cause large friction and cause chuck phenomenon, which affects production efficiency. In addition, aluminum chips will be generated during transportation due to the existence of friction. The existence of aluminum chips will cause the risk of explosion after loading.

[0004] Therefore, there is an urgent need for a hydrocarbon cleaning agent for capacitor shells, a preparation method and a use method thereof to address the deficiencies of the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a carbon hydrogen cleaning agent for capacitor shells, a preparation method and a use method thereof. The carbon hydrogen cleaning agent for capacitor shells of the present invention can effectively remove zinc stearate on the surface of the capacitor shell and carbon black substances generated by zinc stearate under high temperature conditions during the stretching process, and make the surface of the capacitor shell workpiece smooth and not dry after cleaning.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention provides a hydrocarbon cleaning agent for a capacitor shell. The raw materials for preparation include 45 to 80 parts of hydrocarbons, 10 to 25 parts of monoalcohol ether compounds, 5 to 20 parts of polyalcohol ether compounds and 1 to 10 parts of polyester compounds, the monoalcohol ether compounds include propylene glycol butyl ether, the polyalcohol ether compounds include dipropylene glycol dimethyl ether, and the polyester compounds include ethylene glycol diacetate.

[0007] Compared with the prior art, the beneficial effects and specific action mechanism of the hydrocarbon cleaning agent for capacitor shell of the present invention are as follows:

[0008] (1) Zinc stearate has a long-chain alkyl group in its structure, which makes it weaker in polarity overall. Therefore, the present invention uses hydrocarbons as the main component of the cleaning agent system, which can effectively remove most of the zinc stearate particles and other non-polar dirt on the capacitor shell workpiece due to its low polarity.

[0009] (2) The polyester compound including ethylene glycol diacetate of the present invention has a large polarity and can interact with the polar groups on the surface of carbon black particle dirt to form a more stable adsorption layer. Therefore, the addition of the polyester compound can effectively enhance the peeling and dispersion effect of the carbon black particle dirt that is difficult to peel off on the surface of the capacitor shell workpiece. However, the polarity of the polyester compound is greatly different from that of hydrocarbons, so it is difficult to dissolve with hydrocarbons, thereby affecting the overall peeling and dispersion effect. On this basis, the present invention introduces a monool ether compound including propylene glycol butyl ether. Both ethylene glycol diacetate and propylene glycol butyl ether contain polar groups in their structures and have good compatibility. Therefore, the polyester compound can use the monool ether compound as a bridge to improve its solubility in hydrocarbons. At the same time, the monool ether compound can wet the surface of the capacitor shell faster and penetrate into the carbon black dirt generated by the capacitor shell and zinc stearate and its high temperature conditions to weaken its adsorption force on the surface of the capacitor shell workpiece, making it easier to fall off from the surface of the capacitor shell workpiece.

[0010] (3) The polyol ether compound including dipropylene glycol dimethyl ether of the present invention has a structure similar to that of the surfactant polyoxyethylene ether, so it also has a good effect of stripping and dispersing zinc stearate and its carbon black particles, but its action is slightly weaker than that of the surfactant, so it will not make the surface of the workpiece dry after cleaning. The use of monool ether compounds and polyol ether compounds can further improve the wetting and penetration of the cleaning agent system in zinc stearate and its carbon black substances, and can more effectively strip and disperse zinc stearate and its carbon black particles, and effectively prevent the dirt from being adsorbed on the workpiece.

[0011] Therefore, the present invention can effectively remove the zinc stearate on the surface of the capacitor shell and the carbon black substances generated by the zinc stearate under high temperature conditions during the stretching process through the mutual cooperation between the above-mentioned raw materials, and make the surface of the capacitor shell workpiece smooth and not dry after cleaning.

[0012] Furthermore, the hydrocarbon cleaning agent for capacitor shells of the present invention comprises, by weight, 60 to 80 parts of hydrocarbons, 15 to 20 parts of monoalcohol ether compounds, 5 to 10 parts of polyol ether compounds and 3 to 7 parts of polyester compounds.

[0013] Furthermore, the hydrocarbon cleaning agent for capacitor shells of the present invention comprises, by weight, 70 parts of hydrocarbons, 20 parts of monoalcohol ether compounds, 5 parts of polyol ether compounds and 3 parts of polyester compounds.

[0014] Furthermore, the hydrocarbons of the present invention are normal alkanes or isoalkanes with a boiling range of 140°C to 220°C.

[0015] Furthermore, the hydrocarbon compound of the present invention is at least one selected from the group consisting of n-nonane, iso-nonane, n-decane, iso-decane, n-undecane, iso-undecane, n-dodecane and iso-dodecane.

[0016] Furthermore, the monoalcohol ether compound of the present invention also includes at least one of ethylene glycol tert-butyl ether, ethylene glycol butyl ether, propylene glycol propyl ether, and 3-methoxy-3-methyl-1-butanol.

[0017] Furthermore, the polyol ether compound of the present invention also includes diethylene glycol dibutyl ether.

[0018] Furthermore, the polyester compound of the present invention also includes DBE.

[0019] A second aspect of the present invention provides a method for preparing the aforementioned hydrocarbon cleaning agent for capacitor shells, comprising the steps of:

[0020] (1) uniformly mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution;

[0021] (2) adding a formulated amount of a polyester compound to the first mixed solution and mixing uniformly to obtain a second mixed solution;

[0022] (3) Add a formulated amount of polyol ether compound to the second mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0023] The third aspect of the present invention provides a method for using the aforementioned hydrocarbon cleaning agent for capacitor shells, specifically using the aforementioned hydrocarbon cleaning agent for capacitor shells to ultrasonically clean the capacitor shell to be cleaned. The use of the capacitor shell cleaning agent of the present invention in combination with ultrasonic cleaning can further enhance the stripping and dispersion effect of zinc stearate particles and carbon black particles generated under high temperature conditions. DETAILED DESCRIPTION

[0024] The applicant of the present invention found in the process of invention that simply using hydrocarbons to clean the zinc stearate on the surface of the capacitor shell workpiece and the carbon black substances decomposed during the high-temperature stretching process, the surface of the capacitor shell after cleaning is relatively smooth and not dry, and there is no dryness or friction between the shells, but there is still carbon black residue in the shell, and the cleaning is not thorough. On this basis, adding additives such as surfactants can effectively improve the cleaning effect, but it will cause the shell surface to be rough and dry, which is not conducive to subsequent processing and transportation. Based on the above problems, the applicant provides a hydrocarbon cleaning agent for capacitor shells, which can ensure the cleaning effect of zinc stearate and its carbon black particles on the capacitor shell workpiece without adding surfactants and other additives, and can make the surface of the workpiece smooth and not dry after cleaning.

[0025] Specifically, the hydrocarbon cleaning agent for capacitor shell of the present invention comprises, by weight, 45 to 80 parts of hydrocarbons, 10 to 25 parts of monoalcohol ether compounds, 5 to 20 parts of polyalcohol ether compounds and 1 to 10 parts of polyester compounds. The monoalcohol ether compounds include propylene glycol butyl ether, the polyalcohol ether compounds include dipropylene glycol dimethyl ether, and the polyester compounds include ethylene glycol diacetate.

[0026] The weight proportion of the hydrocarbon of the present invention can be, but is not limited to, 45, 50, 55, 60, 65, 70, 75, and 80. In some technical solutions, the weight proportion of the hydrocarbon of the present invention is 60 to 80, and in some technical solutions, the weight proportion of the hydrocarbon of the present invention is 70. The hydrocarbon can be a normal alkane or an isoalkane with a boiling range of 140° C. to 220° C. Specifically, the hydrocarbon is selected from at least one of normal nonane, isomeric nonane, normal decane, isomeric decane, normal undecane, isomeric undecane, normal dodecane, and isomeric dodecane. The hydrocarbon of the present invention has a relatively low polarity and can achieve effective cleaning of dirt and non-polar substances with relatively low polarity.

[0027] The weight proportion of the monoalcohol ether compound of the present invention can be, but is not limited to, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, and 25 parts. In some technical schemes, the weight proportion of the monoalcohol ether compound of the present invention is 15 to 20 parts, and in some technical schemes, the weight proportion of the monoalcohol ether compound of the present invention is 20 parts. The monoalcohol ether compound of the present invention also includes at least one of ethylene glycol tert-butyl ether, ethylene glycol butyl ether, propylene glycol propyl ether, and 3-methoxy-3-methyl-1-butanol. The aforementioned monoalcohol ether compound contains hydroxyl groups and ether bonds, which can enhance the polarity of the cleaning agent system and enhance its wetting and penetration properties on the surface of the capacitor shell workpiece.

[0028] The weight proportion of the polyol ether compound of the present invention can be, but is not limited to, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. In some technical schemes, the weight proportion of the polyol ether compound of the present invention is 5 to 10, and in some technical schemes, the weight proportion of the polyol ether compound of the present invention is 5. The polyol ether compound of the present invention also includes diethylene glycol dibutyl ether. The aforementioned polyol ether compound has a structure similar to that of the surfactant polyoxyethylene ether, so it also has a good effect of dispersing the dissolved and peeled zinc stearate and its carbon black particles, but its action is slightly weaker than that of the surfactant, so it will not make the surface of the workpiece dry after cleaning.

[0029] The weight proportion of the polyester compound of the present invention can be, but is not limited to, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, and 10 parts. In some technical schemes, the weight proportion of the polyester compound of the present invention is 3 to 7 parts, and in some technical schemes, the weight proportion of the polyester compound of the present invention is 5 parts. The polyester compound also includes DBE. DBE refers to a dibasic acid ester mixture, which is composed of dimethyl succinate, dimethyl glutarate, and dimethyl adipate.

[0030] The second aspect of the present invention provides a method for preparing the above-mentioned capacitor shell cleaning agent, comprising the steps of: (1) mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution; (2) adding a polyester compound in a prescribed amount to the first mixed solution to obtain a second mixed solution; (3) adding a polyol ether compound in a prescribed amount to the second mixed solution to obtain a hydrocarbon cleaning agent for the capacitor shell. The present invention first mixes the hydrocarbon compound with the monoalcohol ether compound to form a first mixed solution, which can increase the polarity of the first mixed solution, and then adds a polyester compound with a large polarity to improve the compatibility of the polyester compound with the hydrocarbon compound, effectively avoiding the phenomenon of stratification due to the large difference in polarity when the hydrocarbon compound and the polyester compound are directly mixed, and finally adding the polyol ether compound to ensure the storage stability of the hydrocarbon cleaning agent for the capacitor shell of the present invention.

[0031] The third aspect of the present invention provides a method for using the above capacitor shell cleaning agent, comprising using the above capacitor shell hydrocarbon cleaning agent to ultrasonically clean the capacitor shell to be cleaned. After cleaning, the capacitor shell cleaning agent is distilled and recovered.

[0032] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0033] Example 1

[0034] This embodiment provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0035] The method for preparing the hydrocarbon cleaning agent for capacitor shells in this embodiment comprises the following steps:

[0036] (1) uniformly mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution;

[0037] (2) adding a formulated amount of a polyester compound to the first mixed solution and mixing uniformly to obtain a second mixed solution;

[0038] (3) Add a formulated amount of polyol ether compound to the second mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0039] Example 2

[0040] This embodiment provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 60 parts of hydrocarbon cleaning agent, 24 parts of monoalcohol ether compound, 8 parts of polyalcohol ether compound and 2 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0041] The preparation method of the hydrocarbon cleaning agent for capacitor shell in this embodiment is prepared by referring to the preparation method in Example 1.

[0042] Example 3

[0043] This embodiment provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 10 parts of polyalcohol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0044] The preparation method of the hydrocarbon cleaning agent for capacitor shell in this embodiment is prepared by referring to the preparation method in Example 1.

[0045] Example 4

[0046] This embodiment provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compounds, 5 parts of polyalcohol ether compounds and 3 parts of polyester compounds by weight. Among them, the hydrocarbon cleaning agent is selected from isomeric undecane, the monoalcohol ether compound includes 10 parts of ethylene glycol butyl ether and 10 parts of propylene glycol butyl ether, the polyalcohol ether compound includes 2 parts of diethylene glycol dibutyl ether and 3 parts of dipropylene glycol dimethyl ether, and the polyester compound is selected from 3 parts of ethylene glycol diacetate.

[0047] The preparation method of the hydrocarbon cleaning agent for capacitor shell in this embodiment is prepared by referring to the preparation method in Example 1.

[0048] Example 5

[0049] This embodiment provides a hydrocarbon cleaning agent for capacitor shells, and the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compounds, 5 parts of polyol ether compounds and 3 parts of polyester compounds in parts by weight. Among them, the hydrocarbon cleaning agent is selected from isomeric nonane, the monoalcohol ether compound is selected from 5 parts of propylene glycol propyl ether, 10 parts of propylene glycol butyl ether and 5 parts of 3-methoxy-3-methyl-1-butanol, the polyol ether compound is selected from 3 parts of diethylene glycol dibutyl ether and 2 parts of dipropylene glycol dimethyl ether, and the polyester compound is selected from 2 parts of ethylene glycol diacetate and 1 part of DBE.

[0050] The preparation method of the hydrocarbon cleaning agent for capacitor shell in this embodiment is prepared by referring to the preparation method in Example 1.

[0051] Comparative Example 1

[0052] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 5 parts of polyol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the polyol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0053] The preparation method of the hydrocarbon cleaning agent for capacitor shell of the comparative example comprises the steps of:

[0054] (1) adding a formulated amount of a polyester compound to a formulated amount of a hydrocarbon compound and mixing them uniformly to obtain a first mixed liquid;

[0055] (2) Add a formulated amount of polyol ether compound to the first mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0056] Comparative Example 2

[0057] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0058] The preparation method of the hydrocarbon cleaning agent for capacitor shell of the comparative example comprises the steps of:

[0059] (1) uniformly mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution;

[0060] (2) Add a formulated amount of polyester compound to the first mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0061] Comparative Example 3

[0062] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, and 5 parts of polyalcohol ether compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, and the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether.

[0063] The preparation method of the hydrocarbon cleaning agent for capacitor shell of the comparative example comprises the steps of:

[0064] (1) uniformly mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution;

[0065] (2) Add a formulated amount of polyol ether compound to the first mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0066] Comparative Example 4

[0067] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of surfactant and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the surfactant is selected from isomeric decanol polyoxyethylene ether, and the polyester compound is selected from ethylene glycol diacetate.

[0068] The preparation method of the hydrocarbon cleaning agent for capacitor shell of the comparative example comprises the steps of:

[0069] (1) uniformly mixing a hydrocarbon compound and a monoalcohol ether compound in a prescribed amount to obtain a first mixed solution;

[0070] (2) adding a formulated amount of a polyester compound to the first mixed solution and mixing uniformly to obtain a second mixed solution;

[0071] (3) Add a formulated amount of surfactant into the second mixed liquid and mix evenly to obtain a hydrocarbon cleaning agent for capacitor shells.

[0072] Comparative Example 5

[0073] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol butyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0074] The hydrocarbon cleaning agent for capacitor shell in this comparative example is prepared by the preparation method of reference example 1.

[0075] Comparative Example 6

[0076] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 3 parts of alcohol ether ester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the alcohol ether ester compound is selected from propylene glycol methyl ether acetate.

[0077] The hydrocarbon cleaning agent for capacitor shell in this comparative example is prepared by the preparation method of reference example 1.

[0078] Comparative Example 7

[0079] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 3 parts of monoester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the monoester compound is selected from ethyl lactate.

[0080] The hydrocarbon cleaning agent for capacitor shell in this comparative example is prepared by the preparation method of reference example 1.

[0081] Comparative Example 8

[0082] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 40 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 3 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0083] The hydrocarbon cleaning agent for capacitor shell in this comparative example is prepared by the preparation method of reference example 1.

[0084] Comparative Example 9

[0085] This comparative example provides a hydrocarbon cleaning agent for capacitor shells, wherein the raw materials for preparation include 70 parts of hydrocarbon cleaning agent, 20 parts of monoalcohol ether compound, 5 parts of polyalcohol ether compound and 15 parts of polyester compound by weight. Among them, the hydrocarbon cleaning agent is selected from n-decane, the monoalcohol ether compound is selected from propylene glycol butyl ether, the polyalcohol ether compound is selected from dipropylene glycol dimethyl ether, and the polyester compound is selected from ethylene glycol diacetate.

[0086] The capacitor shells prepared in Examples 1 to 5 and Comparative Examples 1 to 9 were tested for cleaning effect and storage stability using a hydrocarbon cleaning agent, and the results are shown in Table 1.

[0087] Among them, the storage stability is to place the capacitor shell with a hydrocarbon cleaning agent at room temperature for 15 days to observe whether stratification occurs. If stratification occurs, it means that the storage stability is poor. If no stratification occurs, it means that the storage stability is good.

[0088] The cleaning process is to put the capacitor shell hydrocarbon cleaning agent (one of Examples 1 to 5 and Comparative Examples 1 to 9) into an ultrasonic machine, and then put the aluminum alloy capacitor shell into the ultrasonic machine to ensure that the capacitor shell hydrocarbon cleaning agent completely immerses the workpiece, set the cleaning time to 5 min / tank, the number of cleaning tanks to 3 tanks, the cleaning temperature to 50°C, and the frequency of the ultrasonic wave to 40KHz. After the ultrasonic cleaning is completed, the workpiece is dried and then the surface touch evaluation is performed, and the cleanliness is tested by visual inspection and magnifying glass auxiliary inspection.

[0089] Visual inspection: Under natural light or appropriate lighting conditions, if no obvious zinc stearate particles or carbon black particles can be observed with the naked eye and no obvious stains or spots are found, the product is qualified; otherwise, it is unqualified.

[0090] Magnifying glass assisted inspection: After inspection with a 10x magnifying glass, if no zinc stearate particles or carbon black particles are found in the small area and there are no obvious stains or spots, it is qualified; otherwise, it is unqualified.

[0091] Surface feel: 5 professionals in this professional field were selected to touch the cleaned aluminum alloy capacitor shell workpiece with their hands to evaluate its surface feel.

[0092] Table 1 Performance test results of Examples 1 to 5 and Comparative Examples 1 to 9

[0093]

[0094]

[0095] Note: When the prepared hydrocarbon cleaning agent for capacitor shells shows stratification during storage, due to the poor uniformity of the cleaning agent system, the experimental results obtained when the cleaning test is repeated are not stable. Therefore, the cleaning effect of the hydrocarbon cleaning agent for capacitor shells showing stratification is no longer recorded.

[0096] Specifically, as shown in the test results of Table 1, by comparing Example 1 with Comparative Examples 1 to 3, it can be seen that the lack of any one of the polyol ether compound and the polyester compound of the present invention will affect the cleaning effect of the hydrocarbon cleaning agent for the capacitor shell of the present invention, and when the monoalcohol ether compound is lacking, the storage stability of the cleaning agent system will be deteriorated, resulting in stratification, and the uniformity of the cleaning agent system is poor, which will further affect the cleaning effect.

[0097] By comparing Example 1 with Comparative Example 4, it can be seen that although the use of surfactant has an excellent cleaning effect, it will make the surface of the cleaned workpiece rough and dry, affecting the subsequent processing and transportation stability.

[0098] By comparing Example 1 with Comparative Examples 5 to 7, it can be seen that when the polyol ether compound of the present invention is replaced by dipropylene glycol butyl ether, and the polyester compound is replaced by a monoester compound or an alcohol ether ester compound, the cleaning effect thereof will be affected.

[0099] By comparing Example 1 with Comparative Example 8, it can be seen that when the amount of hydrocarbon added is too small, the surface of the workpiece after cleaning will become rough and have a dry feeling.

[0100] By comparing Example 1 with Comparative Example 9, it can be seen that when too much polyester compound is added, the storage stability of the cleaning agent system will be affected, causing the hydrocarbon cleaning agent for the capacitor shell of the present invention to be stratified, and the uniformity of the cleaning agent system is poor, which will further affect the stability of the cleaning effect.

[0101] In summary, from the performance test results of Examples 1 to 5 and Comparative Examples 1 to 9, it can be seen that the use of the carbon hydrogen cleaning agent for capacitor shells of the present invention can effectively remove the zinc stearate on the surface of the capacitor shell and the carbon black substances produced by the decomposition of zinc stearate at high temperature during the stretching process, and make the surface of the capacitor shell workpiece smooth and not dry after cleaning, and have more excellent comprehensive performance.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. Carbon-hydrogen cleaning agent for capacitor shell, characterized in that: The raw materials for preparation include 45 to 80 parts of hydrocarbons, 10 to 25 parts of monoalcohol ether compounds, 5 to 20 parts of polyalcohol ether compounds and 1 to 10 parts of polyester compounds in parts by weight. The monoalcohol ether compounds include propylene glycol butyl ether, the polyalcohol ether compounds include dipropylene glycol dimethyl ether, and the polyester compounds include ethylene glycol diacetate.

2. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: Calculated by weight, it includes 60 to 80 parts of hydrocarbon compounds, 15 to 20 parts of monoalcohol ether compounds, 5 to 10 parts of polyalcohol ether compounds and 3 to 7 parts of polyester compounds.

3. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: It comprises 70 parts of hydrocarbon compounds, 20 parts of monoalcohol ether compounds, 5 parts of polyalcohol ether compounds and 3 parts of polyester compounds.

4. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: The hydrocarbon is a normal alkane or an isoalkane with a boiling range of 140° C. to 220° C.

5. The hydrocarbon cleaning agent for capacitor shell according to claim 4, characterized in that: The hydrocarbon is selected from at least one of n-nonane, iso-nonane, n-decane, iso-decane, n-undecane, iso-undecane, n-dodecane and iso-dodecane.

6. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: The monoalcohol ether compound further comprises at least one of ethylene glycol tert-butyl ether, ethylene glycol butyl ether, propylene glycol propyl ether and 3-methoxy-3-methyl-1-butanol.

7. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: The polyol ether compound also includes diethylene glycol dibutyl ether.

8. The hydrocarbon cleaning agent for capacitor shell according to claim 1, characterized in that: The polyester compound also includes DBE.

9. The method for preparing the hydrocarbon cleaning agent for capacitor shell according to any one of claims 1 to 8 of claim 1, characterized in that: Includes steps: (1) uniformly mixing the hydrocarbon compound and the monoalcohol ether compound in a prescribed amount to obtain a first mixed liquid; (2) adding a formulated amount of the polyester compound to the first mixed solution and mixing evenly to obtain a second mixed solution; (3) Add the polyol ether compound in a prescribed amount into the second mixed liquid and mix them evenly to obtain the hydrocarbon cleaning agent for the capacitor shell.

10. A method for using the hydrocarbon cleaning agent for capacitor shells according to any one of claims 1 to 8 or the hydrocarbon cleaning agent for capacitor shells prepared by the preparation method according to claim 9, characterized in that: The capacitor shell to be cleaned is ultrasonically cleaned by using the capacitor shell hydrocarbon cleaning agent.

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