Alkali washing process of hydraulic element for oil separator
By using alkaline washing process in oil separator production, the problem of poor sealing caused by seam printing is solved, and the product pass rate and detection rate are significantly improved.
Patent Information
- Application Number
- CN202411553549.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-02
- Publication Date
- 2025-02-18
AI Technical Summary
During the production process of oil separator, the joint printing of hydraulic components is affected by surface roughness and impurities, resulting in poor sealing, resulting in leakage and unqualified products.
An alkaline washing process for hydraulic components for oil separators is adopted, including degreasing, cleaning degreasing agents, alkaline washing and neutralization steps. The alkaline washing step uses 80-100 parts by weight of water to add 4-6 parts by weight of sodium nitrate and 3-10 parts by weight of sodium hydroxide, stir until dissolved, and obtains alkaline washing liquid, and heats up to 50-65°C. , soak the hydraulic components for 15-30 minutes.
Through this process, impurities on the surface of the hydraulic component can be effectively cleaned, and seam printing can be revealed, so that they can be distinguished by the naked eye, thereby improving the detection rate of unqualified products and improving the pass rate of the oil separator.
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of oil separators, and in particular to an alkali washing process for hydraulic components used in oil separators. Background Art
[0002] When producing the oil separator, the hydraulic components need to be assembled. However, due to the influence of the surface roughness of various cover plates of the hydraulic components, it is impossible for the two surfaces to be completely in contact during assembly. Due to the microscopic depressions where the two surfaces are not in contact, many pores with various cross-sectional shapes and sizes are formed, which are called seam marks. When the pores are large, the sealing at the joints of the components is poor, resulting in leakage of the oil separator during the oil pressure test, which is a substandard product.
[0003] The cross-sectional size of the pores is related to the surface roughness. However, if the pores are small, they are not easy to be observed with the naked eye, especially after the components are assembled, when there is grease and dirt on the surface, it is even more difficult to observe, resulting in a higher rate of product failure and increased production costs. Summary of the invention
[0004] In order to better judge the seam mark and improve the qualification rate of the oil separator, the present application provides an alkali washing process for the hydraulic components of the oil separator.
[0005] The present application provides an alkali washing process for hydraulic components of an oil separator, which adopts the following technical solution: An alkali washing process for hydraulic components for oil separators includes the following steps: degreasing, cleaning of degreasing agent, alkali washing, neutralization and cleaning of excess acid; the alkali washing steps are as follows: Add 4-6 parts by weight of sodium nitrate and 3-10 parts by weight of sodium hydroxide to 80-100 parts by weight of water, and stir until dissolved to obtain an alkaline washing solution; Heat the alkaline cleaning solution to 50-65℃, then soak the hydraulic components after cleaning and degreasing in the alkaline cleaning solution for 15-30 minutes.
[0006] By adopting the above technical scheme and the alkaline washing process designed in this application, a large amount of impurities on the hydraulic components can be cleaned, and the seam marks that affect the quality of the oil separator can be more clearly revealed and can be identified by the naked eye, thereby greatly improving the detection of defective products and improving the pass rate of the oil separator.
[0007] Preferably, the alkaline washing solution further comprises 3-5 parts by weight of an auxiliary agent, which is an alkyl glycoside.
[0008] By adopting the above technical solution, by adding alkyl polyglycoside to the alkali washing liquid in the alkali washing step, on the one hand, the wetting effect of the alkali washing liquid on the hydraulic component can be improved, so that the alkali washing liquid can have better contact with the hydraulic component and have a stronger cleaning effect on the surface; on the other hand, the surfactant itself can be used to clean the grease and the like on the surface of the hydraulic component. Under the action of both aspects, the cleaning of the alkali washing process can be made more thorough, which is conducive to improving the detection rate.
[0009] Preferably, the alkyl glycoside is silane coupling agent grafted alkyl glycoside.
[0010] By adopting the above technical scheme, by grafting silane coupling agent on alkyl polyglycoside, the affinity of alkyl polyglycoside to hydraulic components can be made stronger through the action of silane coupling agent, so that the wettability of alkaline washing solution on hydraulic components is greatly improved, thereby improving the cleaning strength of alkaline washing process and improving the detection rate of seam marks.
[0011] As a preference, the preparation method of the alkyl polyglycoside being a silane coupling agent grafted alkyl polyglycoside is as follows: S1, using DMF as a reaction solvent, stirring an equimolar amount of an aminosilane coupling agent and an acid anhydride to react, and after the reaction is completed, a solution A is obtained; S2. Add toluene as a water-carrying agent to solution A, add p-toluenesulfonic acid as a catalyst, add an alkyl polyglycoside in an equal molar amount to the aminosilane coupling agent, raise the temperature to 140-155° C., and react to obtain a silane coupling agent-grafted alkyl polyglycoside.
[0012] By adopting the above technical scheme, the amino group in the molecular structure of the aminosilane coupling agent reacts with anhydride to obtain an intermediate product containing a carboxylic acid group, and then an esterification reaction is carried out with an alkyl polyglycoside to successfully graft the silane coupling agent and the alkyl polyglycoside; by designing the reaction in this way, there is no need to separate the intermediate product of the S1 reaction, which can reduce the waste liquid generated by the reaction and improve the preparation efficiency.
[0013] Preferably, the acid anhydride is one or more of phthalic anhydride, succinic anhydride and maleic anhydride.
[0014] By adopting the above technical scheme, the acid anhydride can be selected in any of the above options, which are not listed one by one in the preparation examples, but in theory all of them can achieve the technical effect of the present application.
[0015] Preferably, the alkyl glycoside is one or more of APG0810, APG0814, APG1214 and APG1214.
[0016] By adopting the above technical scheme, alkyl glycoside can be selected in any of the above options, which are not listed one by one in the preparation examples, but in theory all of them can achieve the technical effects of the present application.
[0017] Preferably, the auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside and fatty alcohol polyoxyethylene ether, and the weight ratio of silane coupling agent grafted alkyl glucoside and fatty alcohol polyoxyethylene ether AEO-9 is 2:(0.8-1.2).
[0018] By adopting the above technical scheme, fatty alcohol polyoxyethylene ether is a nonionic surfactant, and alkyl glycoside has good compatibility with nonionic surfactants. After being grafted with silane coupling agent, experiments show that it does not affect its compatibility with nonionic surfactants and can still achieve synergistic effect.
[0019] Preferably, the auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer, and the weight ratio of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2:(0.8-1.2):(0.2-0.8).
[0020] By adopting the above technical scheme, after the alkyl polyglycoside is grafted with a silane coupling agent, the detection rate of defective products is improved, but it is still not able to achieve the effect of complete detection. Poloxamer is a non-ionic polyoxyethylene-polyoxypropylene copolymer, but it is generally used as a pharmaceutical excipient. Poloxamer is stable in nature, easily soluble in water, and stable in the presence of acids, alkalis and metal ions without decomposition. In addition, poloxamer 188 can be used as a non-ionic surfactant, a soft and hard surface cleaner, a metal processing wetting agent, a defoaming agent in coatings and water treatment, a defoaming aid and extender for linear and cross-linked polyesters and polyurethanes, etc. Based on this application, the present application compounds it with silane coupling agent grafted alkyl polyglycoside and fatty alcohol polyoxyethylene ether, so that the seam prints can be detected 100%.
[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the alkaline washing process designed in this application, a large amount of impurities on the hydraulic components can be cleaned, and the seam marks that affect the quality of the oil separator can be more clearly revealed, which can be judged by the naked eye, thereby greatly improving the detection of unqualified products and improving the pass rate of the oil separator.
[0022] 2. By adding alkyl polyglycoside to the alkali washing liquid in the alkali washing step, on the one hand, the wetting effect of the alkali washing liquid on the hydraulic components can be improved, so that the alkali washing liquid can have better contact with the hydraulic components and have a stronger cleaning effect on the surface; on the other hand, it can play its own surfactant role and clean the grease and the like on the surface of the hydraulic components. Under the action of both aspects, the cleaning of the alkali washing process can be made more thorough, which is conducive to improving the detection rate; on this basis, compounding it with fatty alcohol polyoxyethylene ether and poloxamer can make the detection rate reach 100%.
[0023] 3. Through the alkali washing process of the present application, waste oil and other impurities on the surface of hydraulic components can be cleaned, so that the detection rate of seam marks that are difficult to observe with the naked eye can reach 70% or more, and by improving the formula of the alkali solution in the alkali washing process, the detection rate can reach 100%; the problem of undetected seam marks due to incomplete cleaning of the surface of hydraulic components can be eliminated, thereby improving the qualified rate of oil separators. DETAILED DESCRIPTION
[0024] The present application is further described in detail below in conjunction with the specific contents.
[0025] raw material The raw materials used in the preparation examples and embodiments of the present application were all purchased from the market, and the chemicals used, among which, the raw materials used in the preparation examples were all analytically pure, the sodium hydroxide in the embodiments was industrial caustic soda flakes, and the remaining raw materials were industrial grade.
[0026] Preparation Example Preparation Example 1 A silane coupling agent grafted alkyl polyglycoside, the preparation steps are as follows: S1. Add 2.4 g of maleic anhydride to 20 mL of DMF and stir until dissolved to obtain a maleic anhydride solution; add 5 g of 3-aminopropyltriethoxysilane to 100 mL of DMF and stir until dissolved, then dropwise add the maleic anhydride solution, adjust the dropping speed, add the solution over 30 min, and then stir and react for 3 h to obtain a solution A; S2. Add 20 mL of toluene as a water-carrying agent to solution A, add 0.07 g of p-toluenesulfonic acid as a catalyst, and then add 6.0 g of alkyl glycoside, wherein the alkyl glycoside is APG0810. Heat to 150° C., stir to react for 15 h, and then remove the solvent by distillation under reduced pressure to obtain silane coupling agent-grafted alkyl glycoside. Example
[0027] Example 1 An alkali washing process for a hydraulic component of an oil separator comprises the following steps: S1, degreasing Add degreasing agent to water, the mass fraction of the degreasing agent is 8%, and obtain degreasing solution; the model of the degreasing agent is GH-932C; heat the degreasing solution to 60°C, and then immerse the hydraulic components of the oil separator in the degreasing solution for 20 minutes, and then take it out; S2. Cleaning and degreasing agent Wash the degreased hydraulic components twice with clean water; S3, alkali washing Add 5 kg of sodium nitrate and 5 kg of sodium hydroxide to 90 kg of water, stir until dissolved, and obtain an alkaline washing solution; Heat the alkaline cleaning solution to 60°C, then soak the cleaned hydraulic components in the alkaline cleaning solution for 20 minutes and then take them out; S4, Neutralization Prepare a nitric acid solution with a pH value of 2, then soak the hydraulic components after alkali washing in the nitric acid solution for 10 minutes and then take them out; S5. Clean excess acid The neutralized hydraulic component is washed twice in water and dried to obtain the hydraulic component.
[0028] Example 2 An alkali washing process for hydraulic components for oil separators is different from that in Example 1 in that the alkali washing solution also includes 4 kg of an auxiliary agent, which is APG0810 from Preparation Example 1, and the remaining steps are the same as those in Example 1.
[0029] Example 3 An alkaline washing process for hydraulic components for oil separators is different from Example 2 in that the auxiliary agent is an equal mass of silane coupling agent grafted alkyl polyglycoside, the silane coupling agent grafted alkyl polyglycoside comes from Preparation Example 1, and the remaining steps are the same as Example 2.
[0030] Example 4 An alkaline washing process for hydraulic components for an oil separator, which is different from Example 3 in that its auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside and fatty alcohol polyoxyethylene ether AEO-9, the mass ratio of silane coupling agent grafted alkyl glucoside and fatty alcohol polyoxyethylene ether AEO-9 is 2:1, and the remaining steps are the same as Example 3.
[0031] Example 5 An alkali washing process for hydraulic components for an oil separator, which is different from Example 4 in that the auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer, the mass ratio of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2:1:0.5, and the remaining steps are the same as Example 6.
[0032] Example 6 An alkali washing process for hydraulic components for an oil separator, which is different from Example 4 in that the auxiliary agent is a mixture of silane coupling agent grafted alkyl glycoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer, the mass ratio of silane coupling agent grafted alkyl glycoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2:1:0.2, the specification of poloxamer is poloxamer 188, and the remaining steps are the same as Example 6.
[0033] Example 7 An alkali washing process for hydraulic components for an oil separator, which is different from Example 4 in that the auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer, the mass ratio of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2:1:0.8, and the remaining steps are the same as Example 6.
[0034] Example 8 An alkaline washing process for hydraulic components for oil separators is different from that of Example 5 in that the silane coupling agent grafted alkyl polyglycoside in the auxiliary agent is replaced by APG0810 of equal mass, and the remaining steps are the same as those of Example 5.
[0035] Example 9 An alkaline washing process for hydraulic components for an oil separator is different from that of Example 5 in that the amount of sodium hydroxide added in S3 is 3 kg, the pH of the nitric acid solution in S4 is 4, and the remaining steps are the same as those of Example 5.
[0036] Comparative Example Comparative Example 1 An alkali washing process for a hydraulic component for an oil separator is different from that in Example 1 in that the hydraulic component is dried after S1 and S2, and subsequent steps are not performed, and the remaining steps are the same as those in Example 1.
[0037] Performance testing Detection method / test method The hydraulic components were cleaned according to the alkaline cleaning process for the hydraulic components of the oil separator of Examples 1-9 and Comparative Example 1, respectively. The cleaning results are shown in Table 1.
[0038] 200 unqualified hydraulic components with seam marks that are difficult to observe with the naked eye and 80 qualified hydraulic components without seam marks were selected, and then the hydraulic components were immersed in waste oil for 30 minutes, and then they were fished out and dried respectively; then the 220 unqualified products were randomly divided into 11 groups, each with 20, and mixed with 80 qualified products respectively, and then alkali-washed by the alkali-washing process of Examples 1-8 and Comparative Example 1 respectively, one of which was a control example, and the control example did not pass the alkali washing, and each group was tested for seam marks by 3 people, and the test results were averaged. Among them, 80 qualified products were repeatedly immersed and used, and the qualified products and unqualified products had labels written on the same position before detection, and the labels were covered by the same covering.
[0039] Table 1 Test results of Examples 1-9 and Comparative Example 1 Detection rate (%) Is the seam mark fully visible? Example 1 70 no Example 2 75 no Example 3 85 no Example 4 93.33 no Example 5 100 yes Example 6 100 yes Example 7 91.67 yes Example 8 88.33 no Example 9 100 yes Comparative Example 1 31.67 no Comparison example 3.33 no It can be seen from Examples 1-8 and Comparative Example 1, as well as the test data in Table 1, that the alkali washing process of the present application can clean up impurities such as waste oil on the surface of the hydraulic component, so that the detection rate of seam prints that are difficult to observe with the naked eye can reach 70% or more, and by improving the formula of the alkali solution in the alkali washing process, the detection rate can reach 100%; the problem of undetected seam prints due to incomplete cleaning of the surface of the hydraulic component can be eliminated, thereby improving the qualified rate of the oil separator.
[0040] It can be seen from the test data of Example 1 and Comparative Example 1 that the alkaline washing process designed in the present application can clean a large amount of impurities on the hydraulic components, thereby greatly improving the detection of defective products and improving the pass rate of the oil separator.
[0041] By adding alkyl polyglycoside to the alkali washing liquid in the alkali washing step, on the one hand, the wetting effect of the alkali washing liquid on the hydraulic component can be improved, so that the alkali washing liquid can have better contact with the hydraulic component and have a stronger cleaning effect on the surface; on the other hand, it can play its own role as a surfactant and clean the grease and the like on the surface of the hydraulic component. Under the action of both aspects, the cleaning of the alkali washing process can be made more thorough, which is conducive to improving the detection rate. This can be verified by the test data of Examples 1-2.
[0042] By grafting alkyl polyglycoside with silane coupling agent, the affinity of alkyl polyglycoside to hydraulic components can be made stronger through the action of silane coupling agent, so that the wettability of hydraulic components by alkaline washing liquid is greatly improved, thereby improving the cleaning strength of alkaline washing process and improving the detection rate of seam marks. It can be seen from the test data of Examples 2-3.
[0043] After alkyl polyglycoside is grafted with silane coupling agent, the detection rate of defective products is improved, but it is still not able to achieve the effect of complete detection. The general surfactant disclosed with alkyl polyglycoside polar compound cannot achieve the expected effect through experiments. After searching, poloxamer is a non-ionic polyoxyethylene-polyoxypropylene copolymer, but it is generally used as a pharmaceutical excipient. Poloxamer has stable properties, is highly soluble in water, and is stable in the presence of acid, alkali and metal ions without decomposition. In addition, poloxamer 188 can be used as a non-ionic surfactant, a soft and hard surface cleaner, a metal processing wetting agent, a defoaming agent in coatings and water treatment, a defoaming aid and extender for linear and cross-linked polyesters and polyurethanes, etc. Based on this application, the present application compounds it with silane coupling agent grafted alkyl polyglycoside and fatty alcohol polyoxyethylene ether, so that the seam print can be detected 100%. It can be seen from the test results of Examples 3-5. Combined with the test data of Example 8, it can be seen that compounding alkyl glycoside, fatty alcohol polyoxyethylene ether and poloxamer cannot achieve the technical effect of Example 5. It is speculated that although alkyl glycoside, fatty alcohol polyoxyethylene ether and poloxamer work together, they have excellent cleaning ability, but their wettability with metal is not enough, making their cleaning strength on hydraulic components not thorough enough. Combined with Examples 6-7, the mass ratio of silane coupling agent grafted alkyl glycoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2:1:0.5, which is the optimal ratio.
[0044] It can be seen from the test data of Examples 5 and 9 that by compounding the auxiliary agent, the alkali content of the alkali washing solution can be reduced, and at the same time, the concentration of the nitric acid solution can be reduced during neutralization, and the amount of water used during cleaning can also be reduced, which can greatly reduce the discharge of wastewater and reduce pollution to the environment. Moreover, by reducing the alkali content of the alkali washing solution, the detection rate of seam marks can still reach 100%.
[0045] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.
Claims
1. An alkali washing process for hydraulic components of an oil separator, characterized in that: It includes the following steps: degreasing, cleaning the degreasing agent, alkali cleaning, neutralization and cleaning excess acid; the alkali cleaning step is as follows: Add 4-6 parts by weight of sodium nitrate and 3-10 parts by weight of sodium hydroxide to 80-100 parts by weight of water, and stir until dissolved to obtain an alkaline washing solution; Heat the alkaline cleaning solution to 50-65℃, then soak the hydraulic components after cleaning and degreasing in the alkaline cleaning solution for 15-30 minutes.
2. The alkali washing process for hydraulic components for oil separators according to claim 1 is characterized in that: The alkaline washing solution also includes 3-5 parts by weight of an auxiliary agent, which is an alkyl glycoside.
3. The alkali washing process for hydraulic components for oil separators according to claim 2 is characterized in that: The alkyl polyglycoside is a silane coupling agent grafted alkyl polyglycoside.
4. The alkali washing process for hydraulic components for oil separators according to claim 3 is characterized in that: The preparation method of the alkyl polyglycoside is a silane coupling agent grafted alkyl polyglycoside as follows: S1, using DMF as a reaction solvent, stirring an equimolar amount of an aminosilane coupling agent and an acid anhydride to react, and after the reaction is completed, a solution A is obtained; S2. Add toluene as a water-carrying agent to solution A, add p-toluenesulfonic acid as a catalyst, add an alkyl polyglycoside in an equal molar amount to the aminosilane coupling agent, raise the temperature to 140-155° C., and react to obtain a silane coupling agent-grafted alkyl polyglycoside.
5. The alkali washing process for hydraulic components for oil separators according to claim 4, characterized in that: The acid anhydride is one or more of phthalic anhydride, succinic anhydride and maleic anhydride.
6. The alkali washing process for hydraulic components for oil separators according to claim 4, characterized in that: The alkyl glycoside is one or more of APG0810, APG0814, APG1214 and APG1214.
7. The alkali washing process for hydraulic components for oil separators according to claim 2, characterized in that: The auxiliary agent is a mixture of silane coupling agent grafted alkyl glucosides and fatty alcohol polyoxyethylene ether, and the weight ratio of silane coupling agent grafted alkyl glucosides and fatty alcohol polyoxyethylene ether AEO-9 is 2: (0.8-1.2).
8. The alkali washing process for hydraulic components for oil separators according to claim 2, characterized in that: The auxiliary agent is a mixture of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer, and the weight ratio of silane coupling agent grafted alkyl glucoside, fatty alcohol polyoxyethylene ether AEO-9 and poloxamer is 2: (0.8-1.2): (0.2-0.8).