Preparation method of pipeline dredging agent

Abstract

The invention relates to the technical field of pipeline dredging agents, in particular to a preparation method of a pipeline dredging agent. According to the technical scheme, the preparation method comprises the following steps: preparing the following raw materials in parts by weight: 35-40 parts of water, 55-65 parts of a sodium hypochlorite aqueous solution, 0.8-1.2 parts of sodium hydroxide, 1.5-2.5 parts of amine oxide, 3-7 parts of sodium carboxymethyl cellulose, 8-12 parts of polyacrylamide, 12-18 parts of ethylene diamine tetraacetic acid, 18-22 parts of sodium dodecyl benzene sulfonate and 20-25 parts of modified polyvinyl alcohol. The prepared dredging agent can decompose organic matters and effectively dredge pipelines, is high in dirt-removing power, improves the viscosity of the dredging agent, prolongs the residence time of the dredging agent in the pipelines, prolongs the contact time of the dredging agent and blockages, enables the structures of the blockages to become loose, greatly increases the contact area of the blockages and the dredging agent, and improves the dredging efficiency. The dredging efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline dredging agents, and in particular to a preparation method of a pipeline dredging agent. Background Art

[0002] The pipeline dredging agent has a certain fluidity, which causes it to flow away after contacting the condensed blockage, making it difficult for the dredging agent to penetrate and act. The small contact area between the pipeline dredging agent and the blockage leads to low dredging efficiency. Therefore, the present application proposes a preparation method of the pipeline dredging agent. Summary of the invention

[0003] The purpose of the present invention is to propose a method for preparing a pipeline dredging agent in view of the problem in the background technology that the contact area between the pipeline dredging agent and the blockage is small, resulting in low dredging efficiency.

[0004] The technical solution of the present invention is a method for preparing a pipeline dredging agent, comprising the following preparation method: Step 1, prepare the following raw materials in parts by weight: 35-40 parts of water, 55-65 parts of sodium hypochlorite aqueous solution, 0.8-1.2 parts of sodium hydroxide, 1.5-2.5 parts of amine oxide, 3-7 parts of sodium carboxymethyl cellulose, 8-12 parts of polyacrylamide, 12-18 parts of disodium ethylenediaminetetraacetate, 18-22 parts of sodium dodecylbenzene sulfonate, and 20-25 parts of modified polyvinyl alcohol; Step 2: Add water to the reactor and start the agitator at a speed of 200-300 rpm; Step 3, add sodium hypochlorite aqueous solution and stir evenly; Step 4: Add sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate in sequence, and continue stirring for 25-30 minutes to fully dissolve and mix the components; Step 5. Finally, add modified polyvinyl alcohol and stir for 10-20 minutes to package the pipe cleaning agent.

[0005] Optionally, the modified polyvinyl alcohol preparation method comprises the following steps: a. According to the ratio of polyvinyl alcohol: biodegradable polymer of 2:1, weigh polyvinyl alcohol and biodegradable polymer; b. Place polyvinyl alcohol and biodegradable polymer into a high-speed mixer and mix them thoroughly to obtain a mixed material; c. adding the mixture to a twin-screw extruder, and extruding and granulating the mixture at a temperature of 150-200°C and a screw speed of 100-200 rpm to obtain pellets; d. Drying the pellets to remove moisture and obtain modified polyvinyl alcohol.

[0006] Through the above scheme, modified polyvinyl alcohol can enhance the stability of the entire system. Its polymer structure can form a certain network structure in the solution, which helps to evenly disperse and fix other raw material components in it, preventing them from stratification or precipitation during storage or use.

[0007] The presence of modified polyvinyl alcohol improves the compatibility between different raw materials. Modified polyvinyl alcohol can increase the solubility and dispersibility of these ingredients in aqueous solution through its intermolecular interaction, thus making the entire formula more uniform and stable. Modified polyvinyl alcohol has a certain synergistic effect with sodium carboxymethyl cellulose and polyacrylamide polymer compounds, jointly enhancing the viscosity and adhesion of the solution, so that the unclogging agent can better adhere to the surface of the blockage, prolong the action time, and improve the unclogging effect.

[0008] Taking sodium hydroxide as an example, modified polyvinyl alcohol can help maintain the uniform distribution of sodium hydroxide in the solution, ensuring that it can more evenly exert its strong alkaline saponification effect when it comes into contact with the blockage.

[0009] Modified polyvinyl alcohol avoids excessively high or low local concentrations of the dredging agent, and improves the uniformity and stability of the dredging effect. The introduction of biodegradable polymers can reduce the environmental impact of polyvinyl alcohol to a certain extent through the modified blending of polyvinyl alcohol. When the sodium hypochlorite aqueous solution comes into contact with these modified components in the pipeline dredging agent, the biodegradable polymers can decompose faster in the natural environment, reducing residues and potential harm to the environment, and reducing the overall load on the environment.

[0010] Optionally, the biodegradable polymer is polylactic acid.

[0011] Optionally, in step 1, prepare the following raw materials in parts by weight: 36-39 parts of water, 57-63 parts of sodium hypochlorite aqueous solution, 0.9-1.1 parts of sodium hydroxide, 1.8-2.5 parts of amine oxide, 4-7 parts of sodium carboxymethyl cellulose, 9-12 parts of polyacrylamide, 13-17 parts of disodium ethylenediaminetetraacetate, 19-21 parts of sodium dodecylbenzene sulfonate, and 21-24 parts of modified polyvinyl alcohol.

[0012] Optionally, in step 1, prepare the following raw materials in parts by weight: 37.5 parts of water, 60 parts of sodium hypochlorite aqueous solution, 1.0 parts of sodium hydroxide, 2.0 parts of amine oxide, 5 parts of sodium carboxymethyl cellulose, 10 parts of polyacrylamide, 15 parts of disodium ethylenediaminetetraacetate, 20 parts of sodium dodecylbenzene sulfonate, and 22.5 parts of modified polyvinyl alcohol.

[0013] Optionally, in step three, the mass fraction of the sodium hypochlorite aqueous solution is 8%-10%.

[0014] Optionally, in step 4, the rotation speed of the agitator is 75-85 rad / min.

[0015] Optionally, in step b, the speed of the high-speed mixer is 300-500 rpm, and the mixing is performed for 5-10 minutes.

[0016] Optionally, in step d, drying is performed in a drying oven at a temperature of 60-80° C. for 2-4 hours.

[0017] Compared with the prior art, the present invention has at least one of the following beneficial technical effects: Sodium hypochlorite aqueous solution has strong oxidizing properties and can decompose organic matter, effectively dealing with pipe blockages caused by organic matter accumulation; the strong alkalinity of sodium hydroxide helps to saponify grease blockages, making them easier to remove; amine oxide and sodium dodecylbenzene sulfonate, as surfactants, can reduce the interfacial tension between dirt and the pipe surface and enhance the decontamination ability.

[0018] Sodium carboxymethyl cellulose can increase viscosity in the solution, which helps it adhere to the surface of the blockage and make it wet. At the same time, its molecular structure can be inserted into the tiny pores of the blockage to a certain extent, creating conditions for the subsequent other components to play a role. Polyacrylamide can form macromolecular chains in the solution, and connect the tiny particles of the blockage through adsorption and bridging. On the one hand, this helps to loosen the structure of the blockage, and on the other hand, it can also increase the residence time and coverage area of ​​the unblocking agent on the surface of the blockage; disodium ethylenediaminetetraacetic acid has good chelating ability and can combine with metal ions (such as calcium, magnesium, etc.) in the blockage, thereby destroying the structure of the blockage and making it fluffy. At the same time, it can also soften the water quality and improve the effect of other ingredients; sodium dodecylbenzene sulfonate can reduce the interfacial tension between the blockage and the inner wall of the pipe, making it easier to detach from the pipe wall. It can penetrate into the inside of the blockage, play an emulsifying and dispersing role, and further promote the fluffing and decomposition of the blockage. The fluffy blockage is conducive to the unblocking agent entering the inside of the blockage, greatly increasing the contact area between the blockage and the unblocking agent, and improving the unblocking efficiency.

[0019] Polyvinyl alcohol is modified. Through this blending modification, the introduction of biodegradable polymers can reduce the environmental impact of polyvinyl alcohol to a certain extent. When the sodium hypochlorite aqueous solution comes into contact with these modified components in the pipe cleaning agent, the biodegradable polymers can decompose faster in the natural environment, reducing residues and potential harm to the environment, and reducing the overall load on the environment.

[0020] The unblocking agent prepared by the present invention can decompose organic matter, effectively deal with pipeline blockage caused by accumulation of organic matter, has strong decontamination ability, increases the viscosity of the unblocking agent, and further increases the retention time of the unblocking agent in the pipeline, thereby increasing the contact time between the unblocking agent and the blockage, making the structure of the blockage loose, and the fluffy blockage is conducive to the unblocking agent entering the interior of the blockage, greatly increasing the contact area between the blockage and the unblocking agent, and improving the unblocking efficiency. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Example 1

[0022] Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 300 rpm, mix for 5 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 150°C and a screw speed of 100 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 60°C for 2 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 35 kg of water, 55 kg of sodium hypochlorite aqueous solution, 0.8 kg of sodium hydroxide, 1.5 kg of amine oxide, 3 kg of sodium carboxymethyl cellulose, 8 kg of polyacrylamide, 12 kg of disodium ethylenediaminetetraacetate, 18 kg of sodium dodecylbenzene sulfonate, and 20 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 200 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 8% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 75 rad / min, and stirring was continued for 25 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 10 minutes to package the pipe cleaning agent. Example 2

[0023] Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 350 rpm, mix for 6 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 160°C and a screw speed of 120 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 65°C for 2.5 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 36 kg of water, 58 kg of sodium hypochlorite aqueous solution, 0.9 kg of sodium hydroxide, 1.8 kg of amine oxide, 4 kg of sodium carboxymethyl cellulose, 9 kg of polyacrylamide, 14 kg of disodium ethylenediaminetetraacetate, 19 kg of sodium dodecylbenzene sulfonate, and 21 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 220 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 8.5% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 77 rad / min, and stirring was continued for 26 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 12 minutes to package the pipe cleaning agent. Example 3

[0024] Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 400 rpm, mix for 7.5 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 175°C and a screw speed of 150 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 70°C for 3 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 37.5 kg of water, 60 kg of sodium hypochlorite aqueous solution, 1.0 kg of sodium hydroxide, 2.0 kg of amine oxide, 5 kg of sodium carboxymethyl cellulose, 10 kg of polyacrylamide, 15 kg of disodium ethylenediaminetetraacetate, 20 kg of sodium dodecylbenzene sulfonate, and 22.5 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 250 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 9% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 80 rad / min, and stirring was continued for 27 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 15 minutes to package the pipe cleaning agent. Example 4

[0025] Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 450 rpm, mix for 9 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 190° C. and a screw speed of 180 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 78° C. for 3.6 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 39 kg of water, 63 kg of sodium hypochlorite aqueous solution, 1.1 kg of sodium hydroxide, 2.4 kg of amine oxide, 6 kg of sodium carboxymethyl cellulose, 11 kg of polyacrylamide, 17 kg of disodium ethylenediaminetetraacetate, 21 kg of sodium dodecylbenzene sulfonate, and 24 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 280 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 9.5% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 83 rad / min, and stirring was continued for 29 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 18 minutes to package the pipe cleaning agent. Example 5

[0026] Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 500 rpm, mix for 10 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 200°C and a screw speed of 200 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 80°C for 4 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 40 kg of water, 65 kg of sodium hypochlorite aqueous solution, 1.2 kg of sodium hydroxide, 2.5 kg of amine oxide, 7 kg of sodium carboxymethyl cellulose, 12 kg of polyacrylamide, 18 kg of disodium ethylenediaminetetraacetate, 22 kg of sodium dodecylbenzene sulfonate, and 25 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 300 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 10% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 85 rad / min, and stirring was continued for 30 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 20 minutes to package the pipe cleaning agent.

[0027] Comparative Example 1 Preparation of pipe cleaning agent: First, prepare modified polyvinyl alcohol: a. weigh polyvinyl alcohol and polylactic acid in a ratio of 2:1; b. put polyvinyl alcohol and polylactic acid into a high-speed mixer, mix them thoroughly and evenly, the speed of the high-speed mixer is 400 rpm, mix for 7.5 minutes, and obtain a mixture; c. add the mixture into a twin-screw extruder, extrude and granulate at a temperature of 175°C and a screw speed of 150 rpm to obtain pellets; d. dry the pellets, dry them in a drying oven at a temperature of 70°C for 3 hours to remove moisture, and obtain modified polyvinyl alcohol; Weigh the following raw materials in parts by weight: 37.5 kg of water, 60 kg of sodium hypochlorite aqueous solution, 1.0 kg of sodium hydroxide, 2.0 kg of amine oxide, and 22.5 kg of modified polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 250 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 9% and stir evenly; Sodium hydroxide and amine oxide were added in sequence, the stirring speed was 80 rad / min, and stirring was continued for 27 minutes to allow each component to be fully dissolved and mixed; Finally, add modified polyvinyl alcohol and stir for 15 minutes to package the pipe cleaning agent.

[0028] Comparative Example 2 Preparation of pipe cleaning agent: Weigh the following raw materials in parts by weight: 37.5 kg of water, 60 kg of sodium hypochlorite aqueous solution, 1.0 kg of sodium hydroxide, 2.0 kg of amine oxide, 5 kg of sodium carboxymethyl cellulose, 10 kg of polyacrylamide, 15 kg of disodium ethylenediaminetetraacetate, and 20 kg of sodium dodecylbenzene sulfonate; Add water to the reactor, turn on the stirrer at a speed of 250 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 9% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 80 rad / min, and stirring was continued for 27 minutes to fully dissolve and mix the components; Finally, add modified polyvinyl alcohol and stir for 15 minutes to package the pipe cleaning agent.

[0029] Comparative Example 3 Preparation of pipe cleaning agent: Weigh the following raw materials in parts by weight: 37.5 kg of water, 60 kg of sodium hypochlorite aqueous solution, 1.0 kg of sodium hydroxide, 2.0 kg of amine oxide, 5 kg of sodium carboxymethyl cellulose, 10 kg of polyacrylamide, 15 kg of disodium ethylenediaminetetraacetate, 20 kg of sodium dodecylbenzene sulfonate, and 22.5 kg of polyvinyl alcohol; Add water to the reactor, turn on the stirrer at a speed of 250 rpm; add sodium hypochlorite aqueous solution with a mass fraction of 9% and stir evenly; Sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate were added in sequence, the stirring speed was 80 rad / min, and stirring was continued for 27 minutes to fully dissolve and mix the components; Finally, add polyvinyl alcohol and stir for 15 minutes to package the pipe cleaning agent.

[0030] Experimental verification Viscosity test method of pipeline dredging agent 1. Experimental Preparation 1. Material preparation: pipe dredging agents prepared in Examples 1-5 and Comparative Examples 1-3; Viscometer; Temperature controller, used to keep the sample temperature constant; 250ml beaker, used to hold samples; Agitator to ensure homogeneity of the sample; Protective equipment: such as gloves and goggles.

[0031] 2. Experimental Procedure 1. Sample preparation: Prepare pipe cleaning agent samples according to product instructions or experimental requirements.

[0032] If necessary, use a stirrer to mix the sample thoroughly.

[0033] 2. Temperature control: Place the viscometer and container in a temperature controller to ensure a constant temperature during the experiment.

[0034] 3. Measuring viscosity: Pour an appropriate amount of sample into the beaker, then insert the sample in the beaker into the rotor so that the sample liquid level covers the rotor groove.

[0035] ·Start the viscometer and record the reading according to the operating instructions of the viscometer.

[0036] Repeat the measurement 3 times and take the average value to improve accuracy.

[0037] 3. Data recording and analysis: ·Record the viscosity value for each measurement.

[0038] Analyze data to evaluate the viscosity characteristics of pipe cleaning agents.

[0039] 4. Precautions ‌Safe Operation‌: When conducting experiments, be sure to wear appropriate protective equipment and avoid direct contact with samples.

[0040] Sample disposal: After the experiment, samples and waste should be properly disposed of according to the product instructions or laboratory regulations.

[0041] Equipment maintenance: After the experiment, clean and maintain the viscometer and other experimental equipment in a timely manner.

[0042] 5. Practical process of pipeline dredging agent sample testing 1. Pour 200 ml of pipe cleaner sample into a beaker and keep the sample temperature at 25°C; 2. This test uses NDJ-8S digital rotational viscometer with rotor No. 3 and speed No. 4 to detect pipeline dredging agent samples; 3. After the sample reaches 25°C, insert the sample into the rotor so that the sample liquid level covers the rotor groove, and then start the viscometer; 4. When the viscometer shows that the measurement is finished, read the value; the results are as follows: Table 1 Viscosity test data of pipeline dredging agents prepared in Examples 1-5 and Comparative Examples 1-3 Test items Viscosity (mPa·s) Example 1 2680 Example 2 2683 Example 3 2685 Example 4 2685 Example 5 2684 Comparative Example 1 468 Comparative Example 2 483 Comparative Example 3 501 It can be seen from the above table that the pipe unclogging agent prepared in the present application has good viscosity, which is beneficial to the residence time of the unclogging agent on the surface of the blockage and improves the decomposition effect.

[0043] In order to verify the fluffy effect of the present application on blockages, an experimental verification was carried out.

[0044] Experimental testing plan: Experiment name: Detection of the effect of pipeline dredging agent on blockage Experimental purpose: To detect the time required for the pipe dredging agent to change the volume of the blockage and completely decompose it Experimental Materials: Several samples of pipe blockages of the same material and composition, and blockages simulated by food residues; The pipe cleaning agents to be tested: the pipe cleaning agents prepared in Examples 1-5 and Comparative Examples 1-3.

[0045] Experimental steps: Prepare several transparent glass containers of the same size and shape, and label them as 1, 2, 3, 4, 5, 6, 7, and 8; Weigh 50g of the blockage sample, make it into balls of the same volume, put it into each glass container, and scan it with a 3D laser scanner to calculate the volume. The working principle of the 3D laser scanner is to obtain the 3D coordinate information of each point on the surface of the object by emitting a laser beam to the object and then measuring the time or phase difference from the laser emission to the reflection. These large numbers of 3D coordinate points constitute the point cloud data of the object, and then the 3D model of the object can be reconstructed, and the volume of the object can be calculated through the model.

[0046] Add an equal amount of unclogging agent to the blockage in each container, start the timer, and start timing from the moment the unclogging agent is added. Every 5 minutes, observe and record the state of the clumping blockage and its volume to obtain the following data table. The initial volume is recorded as V 0 , 5 minutes later, recorded as V 5 , 10 minutes is recorded as V 10 , and so on, denoted as V 15 、V 20 、V 25 、V 30 .

[0047] Table 2 Changes in the volume of the pellets in Examples 1-5 and Comparative Examples 1-3 Test items <![CDATA[V 0 (cm 3 )]]> <![CDATA[V 5 (cm 3 )]]> <![CDATA[V 10 (cm 3 )]]> <![CDATA[V 15 (cm 3 )]]> <![CDATA[V 20 (cm 3 )]]> <![CDATA[V 25 (cm 3 )]]> <![CDATA[V 30 (cm 3 )]]> Example 1 60 69 52 35 14 0 0 Example 2 60 71 51 34 12 0 0 Example 3 60 72 50 32 11 0 0 Example 4 60 72 50 32 10 0 0 Example 5 60 72 51 33 11 0 0 Comparative Example 1 60 57 51 47 43 40 35 Comparative Example 2 60 62 55 48 42 37 31 Comparative Example 3 60 63 56 47 38 31 24 By comparing the above Examples 1-5 with Comparative Examples 1-3, the unblocking agent prepared in the present application can make the blockage fluffy, making it easier for the oxidizing components of the unblocking agent to enter the blockage, thereby increasing the contact area between the unblocking agent and the blockage, greatly accelerating the decomposition rate of the blockage, and at the same time, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetic acid, sodium dodecylbenzene sulfonate, and modified polyvinyl alcohol have a synergistic effect on the decomposition of the blockage, thereby jointly improving the decomposition rate.

[0048] The sodium carboxymethyl cellulose of the present application can increase viscosity in the solution, thereby helping to adhere to the surface of the blockage and make its surface wet. At the same time, its molecular structure can be inserted into the tiny pores of the blockage to a certain extent, creating conditions for the subsequent other components to play a role. Polyacrylamide can form macromolecular chains in the solution, and connect the tiny particles of the blockage through adsorption and bridging. On the one hand, this helps to loosen the structure of the blockage, and on the other hand, it can also increase the residence time and coverage area of ​​the unblocking agent on the surface of the blockage; disodium ethylenediaminetetraacetic acid has good chelating ability and can combine with metal ions (such as calcium, magnesium, etc.) in the blockage, thereby destroying the structure of the blockage and making it fluffy. At the same time, it can also soften the water quality and improve the effect of other ingredients; sodium dodecylbenzene sulfonate can reduce the interfacial tension between the blockage and the inner wall of the pipe, making it easier to detach from the pipe wall. It can penetrate into the inside of the blockage, play an emulsifying and dispersing role, and further promote the fluffiness and decomposition of the blockage.

[0049] These ingredients work together to destroy and fluff up the blockage in many ways. Disodium EDTA combines with metal ions to destroy the structure of the blockage, sodium dodecylbenzene sulfonate reduces the interfacial tension to make it detach, and sodium carboxymethyl cellulose and polyacrylamide help to maintain the contact and action time between the unblocking agent and the blockage, thereby jointly promoting the decomposition and unblocking of the blockage and facilitating full contact between the unblocking agent and the blockage. The fluffed blockage is conducive to the unblocking agent entering the interior of the blockage, greatly increasing the contact area between the blockage and the unblocking agent, and improving the unblocking efficiency.

[0050] Polyvinyl alcohol is modified. Through this blending modification, the introduction of biodegradable polymers can reduce the environmental impact of polyvinyl alcohol to a certain extent. When the sodium hypochlorite aqueous solution comes into contact with these modified components in the pipe cleaning agent, the biodegradable polymers can decompose faster in the natural environment, reducing residues and potential harm to the environment, and reducing the overall load on the environment.

[0051] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A method for preparing a pipeline dredging agent, characterized in that: The invention comprises the following preparation methods: Step 1, prepare the following raw materials in parts by weight: 35-40 parts of water, 55-65 parts of sodium hypochlorite aqueous solution, 0.8-1.2 parts of sodium hydroxide, 1.5-2.5 parts of amine oxide, 3-7 parts of sodium carboxymethyl cellulose, 8-12 parts of polyacrylamide, 12-18 parts of disodium ethylenediaminetetraacetate, 18-22 parts of sodium dodecylbenzene sulfonate, and 20-25 parts of modified polyvinyl alcohol; Step 2: Add water to the reactor and start the agitator at a speed of 200-300 rpm; Step 3, add sodium hypochlorite aqueous solution and stir evenly; Step 4: Add sodium hydroxide, amine oxide, sodium carboxymethyl cellulose, polyacrylamide, disodium ethylenediaminetetraacetate, and sodium dodecylbenzene sulfonate in sequence, and continue stirring for 25-30 minutes to fully dissolve and mix the components; Step 5. Finally, add modified polyvinyl alcohol and stir for 10-20 minutes to package the pipe cleaning agent.

2. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: The modified polyvinyl alcohol preparation method comprises the following steps: a. According to the ratio of polyvinyl alcohol: biodegradable polymer of 2:1, weigh polyvinyl alcohol and biodegradable polymer; b. Place polyvinyl alcohol and biodegradable polymer into a high-speed mixer and mix them thoroughly to obtain a mixed material; c. adding the mixture to a twin-screw extruder, and extruding and granulating the mixture at a temperature of 150-200°C and a screw speed of 100-200 rpm to obtain pellets; d. Drying the pellets to remove moisture and obtain modified polyvinyl alcohol.

3. The method for preparing a pipeline dredging agent according to claim 2, characterized in that: The biodegradable polymer is polylactic acid.

4. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: Step 1. Prepare the following raw materials in parts by weight: 36-39 parts of water, 57-63 parts of sodium hypochlorite aqueous solution, 0.9-1.1 parts of sodium hydroxide, 1.8-2.5 parts of amine oxide, 4-7 parts of sodium carboxymethyl cellulose, 9-12 parts of polyacrylamide, 13-17 parts of disodium ethylenediaminetetraacetate, 19-21 parts of sodium dodecylbenzene sulfonate, and 21-24 parts of modified polyvinyl alcohol.

5. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: Step 1. Prepare the following raw materials in parts by weight: 37.5 parts of water, 60 parts of sodium hypochlorite aqueous solution, 1.0 parts of sodium hydroxide, 2.0 parts of amine oxide, 5 parts of sodium carboxymethyl cellulose, 10 parts of polyacrylamide, 15 parts of disodium ethylenediaminetetraacetate, 20 parts of sodium dodecylbenzene sulfonate, and 22.5 parts of modified polyvinyl alcohol.

6. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: In step 3, the mass fraction of the sodium hypochlorite aqueous solution is 8%-10%.

7. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: In the step 4, the rotation speed of the agitator is 75-85 rad / min.

8. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: In step b, the speed of the high-speed mixer is 300-500 rpm, and the mixing is performed for 5-10 minutes.

9. The method for preparing a pipeline dredging agent according to claim 1, characterized in that: In step d, the drying is carried out in a drying oven at a temperature of 60-80° C. for 2-4 hours.