Pipeline polishing auxiliary material and preparation method and application thereof

Abstract

The invention provides a pipeline polishing auxiliary material and a preparation method and application thereof, and relates to the technical field of pipeline maintenance. Specifically, the lubricating oil comprises the following components in parts by weight: 20-50 parts of kerosene, 15-35 parts of paraffin, 10-20 parts of stearic acid, 2-8 parts of oleic acid, 10-30 parts of calcium oxide, 0.1-3 parts of an ethylene-vinyl acetate copolymer and 0.1-3 parts of a thickening agent. According to the pipeline polishing auxiliary material, the polishing efficiency is high, and meanwhile the polishing effect and the cleaning effect after polishing are greatly improved; on one hand, the cutter cannot be stuck in the polishing process, and alloy scraps can be simply discharged through compressed air after the pipeline is polished; on the other hand, oleic acid and calcium oxide can generate part of calcium oleate, so that the fluidity of the pasty polishing auxiliary material is reduced, and polishing construction is facilitated; and when the polishing is finished, calcium hydroxide is converted, so that simple washing and cleaning can be realized, and no residue exists.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline maintenance, and in particular to a pipeline grinding auxiliary material, a preparation method thereof, and an application thereof. Background Art

[0002] Aircraft engine castings contain complex piping that must be free of debris, otherwise it will affect the engine. During casting, the piping often contains internal burrs, seams, and weld bumps, which must be polished and removed to create a smooth, polished surface for further use in aircraft engine assembly and operation. Failure to address these internal burrs, seams, and weld bumps can lead to a series of adverse effects. Sharp structures like burrs increase the risk of corrosion or wear within the piping, potentially compromising its tightness and causing leakage. Seams are gaps at pipe connections or welds that can cause leakage and, if not polished and cleaned, can become a reservoir for contaminants and microorganisms, adversely affecting the quality of the contents. Weld bumps are protrusions formed during the welding process that can affect the flow of contents within the pipe, increasing fluid resistance and pressure drop, and also increasing the risk of corrosion or wear. Therefore, the interior of the pipe must be polished and cleaned before use.

[0003] Grinding the inside of pipes typically requires specialized grinding tools, with the grinding head being the primary working component in contact with the pipe. These grinding heads are typically made of alloy. However, when grinding aluminum alloy pipes, welding slag or debris from the pipe often clogs the grinding head, rendering grinding impossible and seriously impacting efficiency. This is often addressed by running water through the pipe to pierce, clean, and cool it. However, the water causes the aluminum chips to adhere to the pipe's interior, making them difficult to remove.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The first purpose of the present invention is to provide a pipeline grinding auxiliary material, which is used to solve the technical defects that the pipeline is easily blocked by welding slag or debris during the grinding process before use, and conventional cooling water cleaning cannot remove the residual alloy slag.

[0006] The second purpose of the present invention is to provide a method for preparing the pipeline grinding auxiliary material.

[0007] The third purpose of the present invention is to provide an application of the pipeline polishing auxiliary material.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] A pipeline polishing auxiliary material, comprising the following components in parts by weight:

[0010] 20-50 parts of kerosene, 15-35 parts of paraffin, 10-20 parts of stearic acid, 2-8 parts of oleic acid, 10-30 parts of calcium oxide, 0.1-3 parts of ethylene-vinyl acetate copolymer and 0.1-3 parts of thickener.

[0011] The preparation method of the pipeline polishing auxiliary material comprises the following steps:

[0012] The pipeline polishing auxiliary material is obtained by fully mixing kerosene, paraffin, stearic acid, oleic acid, calcium oxide, ethylene-vinyl acetate copolymer and a thickener.

[0013] The pipeline grinding auxiliary material is used in the grinding of aviation casting pipelines.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a functional composition as a pipeline polishing auxiliary material, which will not stick to the knife during the polishing process, and after the pipeline is polished, the residual alloy debris can be simply discharged from the pipeline through compressed air, avoiding the technical defects of the alloy sticking to the residue after water washing or the alloy being tightly bonded to the inner wall of the pipeline due to surface tension after water washing and drying. On the other hand, the oleic acid and calcium oxide in the present invention will generate part of calcium oleate, which will reduce the fluidity of the paste polishing auxiliary material and facilitate the polishing construction; and when the polishing is completed, the calcium oleate or calcium oxide is allowed to stand to be converted into calcium hydroxide, which can be easily cleaned with water. The pipeline polishing auxiliary material of the present invention has a high polishing efficiency while greatly improving the polishing effect and the cleaning effect after polishing. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments, but those skilled in the art will understand that the embodiments described below are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and are not to be understood as indicating or implying relative importance.

[0016] A first aspect of the present invention is to provide a pipeline polishing auxiliary material.

[0017] The pipeline polishing auxiliary material includes the following components in parts by weight: 20-50 parts of kerosene, 15-35 parts of paraffin, 10-20 parts of stearic acid, 2-8 parts of oleic acid, 10-30 parts of calcium oxide, 0.1-3 parts of ethylene-vinyl acetate copolymer and 0.1-3 parts of thickener.

[0018] As an optional embodiment, the weight parts of the raw material components of the pipeline polishing auxiliary material include but are not limited to: kerosene 20, 22, 24, 25, 26, 28, 30, 35, 40, 42, 45, 48, 50; paraffin 15, 18, 20, 22, 24, 25, 28, 30, 32, 35; stearic acid 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20; oleic acid 2, 3, 4, 5, 6, 7, 8; calcium oxide 10, 12, 14, 15, 16, 18, 20, 22, 24, 25, 26, 28, 30; ethylene-vinyl acetate copolymer 0.1, 0.2, 0.5, 0.8, 1, 1.2, 1.4, 1.5, 1.6, 1.8, 2, 2.2, 2.4, 2.5, 2.6, 2.8, 3; thickener 0.1, 0.2, 0.5, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3; the above parts by weight can be any numerical point value involved, or a numerical range formed by any two numerical values.

[0019] As a preferred embodiment, the pipeline polishing auxiliary material includes the following components by weight percentage: kerosene 25% to 45%, paraffin 20% to 30%, stearic acid 12% to 18%, oleic acid 2% to 8%, calcium oxide 12% to 25%, ethylene-vinyl acetate copolymer 0.5% to 1% and thickener 0.5% to 1%.

[0020] As an optional embodiment, the weight percentages of the pipeline polishing auxiliary materials include but are not limited to: kerosene 25%, 30%, 35%, 40%, 45%; paraffin 20%, 22%, 24%, 25%, 26%, 28%, 30%; stearic acid 12%, 13%, 14%, 15%, 16%, 17%, 18%; oleic acid 2%, 3%, 4%, 5%, 6%, 7%, 8%; calcium oxide 12%, 14%, 15%, 16%, 18% , 20%, 24%, 25%; ethylene-vinyl acetate copolymer 0.5%, 0.6%, 0.8%, 0.9%, 1%; thickener 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%; the above weight percentages can be any numerical point value involved, or a numerical range composed of any two numerical values; however, it should be noted that when using weight percentage for measurement, the sum of the percentages of all raw material components should be ensured to be 100%.

[0021] As a preferred embodiment, the thickener includes at least one of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose or polyethylene glycol.

[0022] As a preferred embodiment, the molecular weight of the ethylene-vinyl acetate copolymer (EVA) is 2,000 to 80,000.

[0023] As an optional embodiment, the molecular weight of the ethylene-vinyl acetate copolymer includes but is not limited to any one of 2000, 3000, 5000, 10000, 15000, 20000, 25000, 30000, 35000, 40000, 45000, 50000, 55000, 60000, 65000, 70000, 75000, and 80000, or a numerical range consisting of any two points.

[0024] In the present invention, auxiliary materials for pipeline polishing need to be prepared into a paste; among them, the main function of kerosene is that kerosene can dissolve substances such as paraffin, stearic acid and ethylene-vinyl acetate copolymer, thereby obtaining a paste-like mixture with uniform components; at the same time, after the pipeline polishing is completed, due to the low boiling point of kerosene, the kerosene can be volatilized after air is blown into the pipeline, thereby causing other components to solidify and agglomerate, which can be further blown in or washed away without leaving any residue; in addition, ethylene-vinyl acetate copolymer and thickener can also increase viscosity, which makes the polishing auxiliary material have higher adhesion to the pipe wall, reduces the falling and waste of polishing auxiliary material during the polishing process, and also reduces the polishing intensity and time to a certain extent, which can increase the efficiency of the polishing operation.

[0025] Calcium oxide and oleic acid are also added to the present invention; the two can partially react to form calcium oleate. Since the amount of calcium oxide used is much higher than that of oleic acid, the pipeline polishing auxiliary material also contains a high proportion of unreacted calcium oxide components. Calcium oleate and calcium oxide can reduce the fluidity of the polishing auxiliary material paste, making it cleaner and more convenient to use during construction. In addition, the calcium oxide component easily absorbs moisture and deteriorates and expands in volume when left in the air for a long time, so that the generated calcium hydroxide can also be more easily washed out by water after the pipeline polishing is implemented.

[0026] During the pipeline grinding process, the welding slag and debris that fall off the inside of the pipeline can easily stick to the gap of the grinding head, causing the grinding head to be blocked and unable to continue the grinding operation, which seriously affects the grinding efficiency; in conventional operations, flushing, penetration, cleaning, etc. are required after a period of grinding operation; and the grinding auxiliary material in the present invention introduces an oily mixture, in which paraffin and stearic acid have a lubricating effect, and kerosene has a cooling effect, so that the knife will not stick when grinding the pipeline, and the metal debris dropped by grinding can be easily discharged from the pipeline with compressed air; at the same time, since the grinding auxiliary material is in a paste-like state as a whole, the debris by-products after grinding are not easy to stick to the pipe wall, but are mixed or adhered to the inside or surface of the grinding auxiliary material, which can greatly reduce the cleaning efficiency after grinding.

[0027] The second aspect of the present invention is to provide a method for preparing the pipeline polishing auxiliary material.

[0028] The preparation method of the pipeline polishing auxiliary material comprises the following steps: fully mixing kerosene, paraffin, stearic acid, oleic acid, calcium oxide, ethylene-vinyl acetate copolymer and a thickener to obtain the pipeline polishing auxiliary material.

[0029] As a preferred embodiment, the preparation method comprises the following steps:

[0030] (1) firstly melt and mix the paraffin wax and the stearic acid to obtain a first mixed material;

[0031] (2) adding the ethylene-vinyl acetate copolymer to the first mixture and mixing thoroughly to obtain a second mixture;

[0032] (3) adding the oleic acid and the calcium oxide to the second mixture and mixing them thoroughly to obtain a third mixture;

[0033] (4) adding the kerosene to the third mixed material and mixing thoroughly to obtain a fourth mixed material;

[0034] (5) Adding the thickener to the fourth mixed material and mixing thoroughly to obtain a pipeline polishing auxiliary material.

[0035] As a preferred embodiment, the temperature of the melt mixing in step (1) is 70°C to 80°C.

[0036] As a preferred embodiment, the temperature of the melt mixing in step (1) is maintained during steps (2) to (5).

[0037] As a more preferred embodiment, after the mixing is completed in step (5), the temperature is restored to room temperature and the pipeline polishing auxiliary material in a paste form is obtained.

[0038] As a preferred embodiment, all the mixing in steps (1) to (5) is carried out under stirring. Those skilled in the art can adaptively adjust the speed or duration of the stirring state according to the actual mixing conditions, and this is not strictly limited in the present invention.

[0039] As an optional embodiment, all of the mixing in steps (1) to (5) is carried out in one of the centrifugal state, ultrasonic state, oscillation state or shaking state to replace the stirring state in the above preferred embodiment.

[0040] The third aspect of the present invention is to provide the use of the pipeline grinding auxiliary material in the grinding of aviation casting pipelines.

[0041] With respect to the said use, it can be understood that the pipeline grinding process method obtained based on the pipeline grinding auxiliary material provided by the first aspect of the present invention, or the pipeline obtained based on the pipeline grinding auxiliary material provided by the first aspect of the present invention should all belong to an embodiment of the present invention.

[0042] As an optional implementation, the aviation casting pipeline is made of aluminum alloy.

[0043] Example 1

[0044] This embodiment provides a pipeline polishing auxiliary material, and the prepared raw material composition is composed of the following components by weight percentage: 35% kerosene, 25% paraffin, 15% stearic acid, 5% oleic acid, 18% calcium oxide, 1% ethylene-vinyl acetate copolymer (DuPont E418, USA) and 1% thickener (polyethylene glycol).

[0045] The preparation process of this embodiment is as follows:

[0046] (1) firstly melting the paraffin wax and the stearic acid at 75° C. and stirring and mixing them to obtain a first mixed material;

[0047] (2) adding the ethylene-vinyl acetate copolymer to the first mixture, stirring and mixing, to obtain a second mixture;

[0048] (3) adding the oleic acid and the calcium oxide to the second mixture, stirring and mixing, to obtain a third mixture;

[0049] (4) adding the kerosene to the third mixed material, stirring and mixing, to obtain a fourth mixed material;

[0050] (5) Adding the thickener to the fourth mixed material, stirring and mixing, and obtaining a pipeline polishing auxiliary material.

[0051] Example 2

[0052] The method is basically the same as Example 1, except that the ethylene-vinyl acetate copolymer is Japanese Sumitomo SWA130, and the thickener is hydroxypropyl methylcellulose.

[0053] Example 3

[0054] The method is basically the same as Example 1, except that the weight percentages of the components are changed to: kerosene 31%, paraffin 30%, stearic acid 18%, oleic acid 8%, calcium oxide 12%, ethylene-vinyl acetate copolymer 0.5% and thickener 0.5%.

[0055] Example 4

[0056] The method is basically the same as Example 1, except that the weight percentages of the components are changed to: kerosene 39%, paraffin 20%, stearic acid 12%, oleic acid 2%, calcium oxide 25%, ethylene-vinyl acetate copolymer 1% and thickener 1%.

[0057] Example 5

[0058] The method is basically the same as Example 1, with the only difference being that: in the preparation process of this embodiment, there is no order of adding raw materials, and all raw materials are mixed in a blender, stirred at 80° C., and then extruded to obtain the product.

[0059] Test example

[0060] The pipeline polishing auxiliary materials of each embodiment are used to polish an untreated new aluminum alloy pipeline. The main steps are as follows:

[0061] 1. Apply a layer of auxiliary material on the grinding head;

[0062] 2. Insert the grinding head deep into the part of the pipeline that needs to be polished;

[0063] 3. Start the grinding tool for grinding;

[0064] 4. Perform endoscopic inspection on the polished area to verify the polishing effect.

[0065] The result after polishing is a smooth inner wall of the pipe, free of burrs, seams, weld bumps, or other protrusions, and no foreign matter inside the pipe. Furthermore, after polishing, let it sit for a while, connect a water pipe to tap water, and rinse the polished area. All polishing materials will be flushed out with the water, leaving no solid residue.

[0066] Although the present invention has been illustrated and described using specific embodiments, it should be appreciated that the above embodiments are merely intended to illustrate the technical solutions of the present invention rather than to limit them. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents, without departing from the spirit and scope of the present invention. However, these modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A pipeline polishing auxiliary material, characterized in that: The pipeline polishing auxiliary material includes the following components in parts by weight: 20-50 parts of kerosene, 15-35 parts of paraffin, 10-20 parts of stearic acid, 2-8 parts of oleic acid, 10-30 parts of calcium oxide, 0.1-3 parts of ethylene-vinyl acetate copolymer and 0.1-3 parts of thickener.

2. The pipeline polishing auxiliary material according to claim 1, characterized in that: The pipeline polishing auxiliary material includes the following components by weight percentage: Kerosene 25%-45%, paraffin 20%-30%, stearic acid 12%-18%, oleic acid 2%-8%, calcium oxide 12%-25%, ethylene-vinyl acetate copolymer 0.5%-1% and thickener 0.5%-1%.

3. The pipeline polishing auxiliary material according to claim 1, characterized in that: The thickening agent includes at least one of methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose or polyethylene glycol.

4. The pipeline polishing auxiliary material according to claim 1, characterized in that: The molecular weight of the ethylene-vinyl acetate copolymer is 2,000 to 80,000.

5. The method for preparing the pipeline polishing auxiliary material according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: The pipeline polishing auxiliary material is obtained by fully mixing kerosene, paraffin, stearic acid, oleic acid, calcium oxide, ethylene-vinyl acetate copolymer and a thickener.

6. The method for preparing pipeline polishing auxiliary material according to claim 5, characterized in that: The preparation method comprises the following steps: firstly melting and mixing the paraffin wax and the stearic acid, then adding and melting the ethylene-vinyl acetate copolymer, then adding and fully mixing the oleic acid and the calcium oxide, then adding and fully mixing the kerosene, and finally adding and fully mixing the thickener to obtain the pipeline polishing auxiliary material.

7. The method for preparing pipeline polishing auxiliary material according to claim 5, characterized in that: The mixing in the preparation method is all carried out under stirring.

8. Use of the pipeline polishing auxiliary material according to any one of claims 1 to 4 in polishing aviation casting pipelines.

9. The use according to claim 8, characterized in that The aviation casting pipeline is made of aluminum alloy.