A simple drag-reducing polymer liquid dispersion method, drag-reducing dispersion liquid and application

Abstract

The application discloses a simple drag-reducing polymer liquid dispersion method, a drag-reducing dispersion liquid and application, and belongs to the technical field of drag reduction. The method steps are as follows: preparing a grinding liquid: liquid dispersion, solid dispersion and a density regulator are placed in a grinding tank, grinding balls are put into the grinding tank, and the grinding liquid is obtained after grinding for a sufficient time; preparing a drag-reducing dispersion liquid: the grinding liquid obtained in step 1 and a drag-reducing polymer are put into a mixing machine, and the drag-reducing dispersion liquid is obtained after mixing; dissolving the drag-reducing dispersion liquid: the drag-reducing dispersion liquid obtained in step 2 is weighed, and is added into water at a time, and stirring is performed for 20 seconds, so that the drag-reducing solution is obtained. The application solves the problems that the polymer is prone to flocculation and agglomeration when being added at a time in the prior art, and the slow dispersion speed leads to slow dissolution.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of drag reduction technology, and particularly relates to a simple drag reduction polymer liquid dispersion method, a drag reduction dispersion liquid and application, especially for the dispersion of drag reduction polymer in one-time addition. BACKGROUND

[0002] Drag reduction technology has always been a hot topic of scientific research because it can make marine vehicles achieve the purpose of speed increase, range increase and energy saving. At present, high polymer dilute solution is an effective drag reduction method, and the highest drag reduction rate can reach 80% under certain drag reduction conditions. When configuring the solution, the solid drag reduction polymer is not easy to disperse due to the flocculation effect, and the solution configuration time is long. Therefore, in actual engineering application, it is of great significance to speed up the dispersion speed of drag reduction polymer in one-time addition.

[0003] Patent CN 111286204B discloses a high molecular composite that can be quickly dissolved or dispersed in a water-containing solvent, a preparation method and application thereof. The dissolved high polymer needs to be dissolved in water and then dried, and the preparation process is complex. If a drag reduction polymer is used, its structure may be damaged.

[0004] Patent CN 114736504A discloses a method for dissolving drag reduction polymer powder, which uses sodium bicarbonate and citric acid to generate gas to promote the dispersion and dissolution of the high polymer. In a closed space, a gas discharge device needs to be additionally added, which increases the load of the drag reduction carrier.

[0005] In the invention disclosed in CN112316794A, a polyacrylamide polymer dispersion device and a dissolution system are disclosed. The system introduces compressed air into the polyacrylamide conveying pipeline to speed up the delivery of polyacrylamide medicine to the dissolution tank, and realizes the dissolution of polyacrylamide through stirring in the dissolution tank. This method accelerates the rapid delivery of raw materials to a certain extent, but the mechanical stirring method still needs a long time, and the high shear rate during stirring can damage the molecular structure of polyacrylamide, reducing the drag reduction effect.

[0006] Patent CN 109173917A discloses a high polymer concentrated solution rapid and uniform dilution device, which mixes and dilutes the drag reduction polymer concentrated solution with water into a drag reduction polymer dilute solution and then applies it to drag reduction. However, a large amount of concentrated solution needs to be prepared in advance, which is not convenient to carry, and increases the load of the drag reduction carrier.

[0007] Patent CN107698708A discloses a preparation method of a salt-resistant instant drag reducer, which is prepared by a series of reactions of various chemical raw materials under specific conditions to generate a salt-resistant drag reducer. However, the reaction process is complex, the reaction environment is high, and the reaction time is as long as 5-6 hours, which does not meet the requirements of instant use.

[0008] Based on the slow dispersion of the existing high polymer drag reduction technology in one-time addition, based on the principle of liquid phase dispersion, the application provides a simple drag reduction high polymer liquid phase dispersion method, a drag reduction dispersion liquid and application. SUMMARY

[0009] The technical problem to be solved is:

[0010] In order to avoid the shortcomings of the prior art, the application provides a simple drag reduction high polymer liquid phase dispersion method, a drag reduction dispersion liquid and application, which is based on a certain physical adsorption and easy-to-grind material, uses a solid-liquid mixed dispersion method, and uses a certain process to prepare a drag reduction dispersion liquid in advance. When added once, stirring can quickly disperse, inhibit flocculation effect, and improve dissolution speed. The application solves the problem of slow dissolution caused by easy flocculation and slow dispersion speed of high polymer in one-time addition in the prior art.

[0011] The technical scheme of the application is: a simple drag reduction high polymer liquid phase dispersion method, the specific steps are as follows:

[0012] Step 1. Prepare a grinding liquid;

[0013] Put the liquid phase dispersion body, the solid phase dispersion body and the density regulator into the grinding tank, put in the grinding ball, and grind for enough time to obtain the grinding liquid;

[0014] Step 2. Prepare a drag reduction dispersion liquid;

[0015] Put the grinding liquid obtained in step 1 and the drag reduction high polymer into the mixing machine, and mix to obtain the drag reduction dispersion liquid;

[0016] Step 3. Dissolution of the drag reduction dispersion liquid;

[0017] Weigh the required drag reduction dispersion liquid obtained in step 2, add it into water once, and stir for 20 seconds to obtain the drag reduction solution.

[0018] The further technical scheme of the application is: the liquid phase dispersion body is glycerol; the liquid phase dispersion body is miscible with water, and is slightly soluble or insoluble with the solid phase dispersion body and the drag reduction high polymer.

[0019] The further technical scheme of the application is: the solid phase dispersion body is polyethylene glycol 2000-20000, table salt or granulated sugar, which has dispersibility, adsorbability and water solubility.

[0020] The density regulator is one or more of methanol, ethanol, propanol, and ethylene glycol; the density regulator is mutually soluble with the liquid-phase dispersion and insoluble with the drag-reducing polymer.

[0021] The mass ratio of the liquid-phase dispersion, the solid-phase dispersion, and the density regulator in step 1 is 10:(1-10):(1-2).

[0022] The grinding time in step 1 is 12-36 hours.

[0023] The mass ratio of the grinding liquid and the drag-reducing polymer in step 2 is 10:(1-10), and the blending time is 2 minutes.

[0024] The drag-reducing dispersion liquid is prepared by a simple drag-reducing polymer liquid-phase dispersion method.

[0025] The drag-reducing dispersion liquid prepared by a simple drag-reducing polymer liquid-phase dispersion method is applied to the drag reduction of underwater vehicles, ship bottoms, and pipelines.

[0026] The drag-reducing dispersion liquid prepared by a simple drag-reducing polymer liquid-phase dispersion method is applied to the drag reduction of underwater vehicles, ship bottoms, and pipelines.

[0027] Advantages

[0028] The present application has the advantages that the drag-reducing dispersion liquid can be prepared in advance, the mass fraction of the drag-reducing polymer can be up to 50%, and the carrying efficiency is improved.

[0029] The present application has the advantages that the drag-reducing dispersion liquid can be prepared in advance, the mass fraction of the drag-reducing polymer can be up to 50%, and the carrying efficiency is improved.

[0030] The present application has the advantages that the drag-reducing dispersion liquid can be prepared in advance, the mass fraction of the drag-reducing polymer can be up to 50%, and the carrying efficiency is improved.

[0031] As shown in FIG. 1, the conventional drag-reducing polymer does not disperse due to its own flocculation effect and immediately forms agglomerates when added once in water, and does not significantly dissolve within 5 minutes. The present application uses a liquid-phase dispersion and a water-soluble solid-phase dispersion that are miscible with water to inhibit the flocculation phenomenon when the drag-reducing polymer dissolves. Figure 2 As shown in FIG. 1, the conventional drag-reducing polymer does not disperse due to its own flocculation effect and immediately forms agglomerates when added once in water, and does not significantly dissolve within 5 minutes. The present application uses a liquid-phase dispersion and a water-soluble solid-phase dispersion that are miscible with water to inhibit the flocculation phenomenon when the drag-reducing polymer dissolves.

[0032] Since the drag-reducing dispersion is a liquid, it can be added using a quantitative injection method, and can be automatically controlled using an electric injection pump.

[0033] As shown in FIG. 1, the conventional drag-reducing polymer does not disperse due to its own flocculation effect and immediately forms agglomerates when added once in water, and does not significantly dissolve within 5 minutes. The present application uses a liquid-phase dispersion and a water-soluble solid-phase dispersion that are miscible with water to inhibit the flocculation phenomenon when the drag-reducing polymer dissolves. Figure 3 4 As shown in FIG. 5, when the drag-reducing polymer is added once in Examples 1, 2, and 3, the drag-reducing dispersion is quickly dispersed and dissolved using the liquid-phase dispersion method, and is completely dispersed at 20 seconds. In Comparative Examples 1, 2, and 3, the drag-reducing polymer is not completely dispersed and dissolved at 20 seconds.

[0034] The design difficulty of the present application lies in the selection and use of the quality ratio of the liquid-phase dispersion, the solid-phase dispersion, and the density regulator, and the dispersion method formed in the process. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a schematic diagram of the direct dissolution of the drag-reducing polymer when added once and the liquid-phase dispersion and dissolution of the drag-reducing polymer.

[0036] Figure 2 FIG. 2 is a change in the dispersion and dissolution state of the drag-reducing polymer when added once, and the agglomerates formed due to the flocculation of the drag-reducing polymer that is not dispersed. The agglomerates are not completely dispersed and dissolved even after 5 minutes of stirring.

[0037] Figure 3 FIG. 3 is a change in the dispersion and dissolution state of the liquid-phase dispersion method and the normal drag-reducing polymer when added once in Example 1 and Comparative Example 1. The drag-reducing polymer using the method of Example 1 is completely dispersed and dissolved at 20 seconds after being added once, and the polymer added once using the normal method of Comparative Example 1 is agglomerated and not completely dispersed and dissolved.

[0038] Figure 4 FIG. 4 is a change in the dispersion and dissolution state of the liquid-phase dispersion method and the normal drag-reducing polymer when added once in Example 2 and Comparative Example 2. The drag-reducing polymer using the method of Example 2 is completely dispersed and dissolved at 20 seconds after being added once, and the polymer added once using the normal method of Comparative Example 2 is agglomerated and not completely dispersed and dissolved.

[0039] Figure 5 ​The dispersion and dissolution state change of the liquid phase dispersion method and normal drag reducing polymer one-time addition in Example 3 and Comparative Example 3. After 20 seconds of one-time addition, the drag reducing polymer using the method described in Example 3 has been completely dispersed and dissolved, and the polymer added by one-time addition using the normal method in Comparative Example 3 is agglomerated and not completely dispersed and dissolved. DETAILED DESCRIPTION

[0040] The examples described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0041] Example 1:

[0042] Step 1. Preparation of the grinding liquid

[0043] Take the liquid phase dispersion, solid phase dispersion, and density regulator into the grinding tank, put in the grinding balls, and grind for a sufficient time to obtain the grinding liquid.

[0044] The liquid phase dispersion is glycerol.

[0045] The solid phase dispersion is polyethylene glycol 2000.

[0046] The mass ratio of the liquid phase dispersion to the solid phase dispersion is 10:1.

[0047] The density regulator is 1,2-ethanediol.

[0048] The mass ratio of the density regulator to the liquid phase dispersion is 2:1.

[0049] The grinding time is 12 hours.

[0050] Step 2. Preparation of the drag reduction dispersion liquid

[0051] Take the grinding liquid in Step 1 and the drag reducing polymer into the blender, and blend for 2 minutes to obtain the drag reduction dispersion liquid.

[0052] The drag reducing polymer is polyethylene oxide with a molecular weight of 4 million.

[0053] The mass ratio of the grinding liquid to the drag reducing polymer is 10:1.

[0054] Step 3. Dissolution of the drag reduction dispersion liquid

[0055] Take 3.3 g of the drag reduction dispersion liquid in Step 2 and add it into 3000 mL of water at one time, and stir for 20 seconds to obtain the drag reduction solution.

[0056] The addition method is quantitative injection.

[0057] Comparative Example 1:

[0058] Take 3000ml water, weigh 0.3g of the drag-reducing polymer, add into the water at one time, stir and observe the dispersion and dissolution state of the drag-reducing polymer.

[0059] The drag-reducing polymer is polyethylene oxide with a molecular weight of 4 million.

[0060] The dispersion and dissolution effect of the drag-reducing polymer of Example 1 and Comparative Example 1 is shown in Figure 3 When stirring for 20 seconds at one time, the drag-reducing polymer of the method of Example 1 has been completely dispersed and dissolved, and the polymer added at one time by the normal method of Comparative Example 1 is agglomerated and not completely dispersed and dissolved.

[0061] Example 2:

[0062] Step 1. Preparation of the grinding liquid

[0063] Take the liquid dispersion, solid dispersion and density regulator into the grinding tank, put in the grinding balls, and grind for a sufficient time to obtain the grinding liquid.

[0064] The liquid dispersion is glycerol.

[0065] The solid dispersion is table salt.

[0066] The mass ratio of the liquid dispersion to the solid dispersion is 2:1.

[0067] The density regulator is ethanol.

[0068] The mass ratio of the density regulator to the liquid dispersion is 3:1.

[0069] The grinding time is 24 hours.

[0070] Step 2. Preparation of the drag-reducing dispersion liquid

[0071] Take the grinding liquid in Step 1 and the drag-reducing polymer into the blender, blend for 2 minutes to obtain the drag-reducing dispersion liquid.

[0072] The drag-reducing polymer is polyacrylamide.

[0073] The mass ratio of the grinding liquid to the drag-reducing polymer is 2:1.

[0074] Step 3. Dissolution of the drag-reducing dispersion liquid

[0075] Weigh the required drag-reducing dispersion liquid in Step 2, add into 3000ml water at one time, and stir for 20 seconds to obtain the drag-reducing solution.

[0076] The adding method is pouring after weighing.

[0077] Comparative Example 2:

[0078] Take 3000 mL water, weigh 0.9 g of the drag-reducing polymer, add into the water at one time, stir and observe the state of dispersion and dissolution of the drag-reducing polymer.

[0079] The drag-reducing polymer is polyacrylamide.

[0080] The dispersion effect of the drag-reducing polymer of Example 2 and the normal method of Comparative Example 2 is shown in the following table. Figure 4 When stirring for 20 seconds at one time, the drag-reducing polymer of Example 2 has been completely dispersed and dissolved, and the polymer added at one time by the normal method of Comparative Example 2 is agglomerated and not completely dispersed and dissolved.

[0081] Example 3:

[0082] Step 1. Preparation of the grinding liquid

[0083] Take the liquid dispersion, the solid dispersion, the density regulator into the grinding tank, put in the grinding ball, and grind for enough time to obtain the grinding liquid.

[0084] The liquid dispersion is glycerol.

[0085] The solid dispersion is granulated sugar.

[0086] The mass ratio of the liquid dispersion to the solid dispersion is 1:1.

[0087] The density regulator is 1,2-ethanediol.

[0088] The mass ratio of the density regulator to the liquid dispersion is 1:3.

[0089] The grinding time is 36 hours.

[0090] Step 2. Preparation of the drag-reducing dispersion liquid

[0091] Take the grinding liquid of Step 1 and the drag-reducing polymer into the blender, blend for 2 minutes to obtain the drag-reducing dispersion liquid.

[0092] The drag-reducing polymer is xanthan gum.

[0093] The mass ratio of the grinding liquid to the drag-reducing polymer is 1:1.

[0094] Step 3. Dissolution of the drag-reducing dispersion liquid

[0095] Weigh the required drag-reducing dispersion liquid of Step 2, add into 3000 mL water at one time, and stir for 20 seconds to obtain the drag-reducing solution.

[0096] The adding mode is spray adding.

[0097] Comparative Example 3:

[0098] Take 3000ml water, weigh 0.6g of the drag-reducing polymer, add into the water at one time, stir and observe the state of dispersion and dissolution of the drag-reducing polymer.

[0099] The drag-reducing polymer is xanthan gum.

[0100] The dispersion effect of the drag-reducing polymer described in Example 3 and Comparative Example 3 is as shown in the table. Figure 5 When stirring for 20 seconds at one time, the drag-reducing polymer described in Example 3 has been completely dispersed and dissolved, while the polymer added at one time according to the normal method of Comparative Example 3 is agglomerated and not completely dispersed and dissolved.

[0101] Although the embodiments of the present application have been shown and described above, it should be understood by those skilled in the art that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and purposes of the present application within the scope of the present application.

Claims

1. A simple drag-reducing polymer liquid dispersion method, characterized by: The specific steps are as follows: Step 1. Prepare the grinding liquid; Put the liquid phase dispersion, solid phase dispersion and density regulator into the grinding tank, put in the grinding ball, and grind for a sufficient time to obtain the grinding liquid; the liquid phase dispersion is glycerol; the liquid phase dispersion is miscible with water, and is slightly soluble or insoluble in the solid phase dispersion and the drag-reducing polymer; the solid phase dispersion is polyethylene glycol 2000-20000, table salt or sugar, and has dispersibility, adsorbability and water solubility; the density regulator is one or more of methanol, ethanol, propanol and ethylene glycol; the density regulator is miscible with the liquid phase dispersion and insoluble in the drag-reducing polymer; The mass ratio of the liquid phase dispersion, the solid phase dispersion and the density regulator is 10:(1-10):(1-2); Step 2. Prepare the drag-reducing dispersion liquid; Put the grinding liquid obtained in step 1 and the drag-reducing polymer into the blender, and blend to obtain the drag-reducing dispersion liquid; Step 3. Dissolution of the drag-reducing dispersion liquid; Weigh the drag-reducing dispersion liquid obtained in step 2, add it into water at one time, and stir for 20 seconds to obtain the drag-reducing solution.

2. The simple method for dispersing high polymer in liquid phase according to claim 1, characterized in that: In step 1, the grinding time is 12-36 hours.

3. The simple method for dispersing high polymer in liquid phase according to claim 2, characterized in that: In step 2, the mass ratio of the grinding liquid to the drag-reducing polymer is 10:(1-10), and the blending time is 2 minutes.

4. The simple method for dispersing high polymer in liquid phase according to claim 3, characterized in that: In step 3, the drag-reducing dispersion liquid is added to water by quantitative injection or direct weighing.

5. A drag-reducing dispersion prepared by the simplified drag-reducing polymer liquid-phase dispersion method according to claim 4, characterized in that: The drag-reducing dispersion liquid is applied to the drag reduction of underwater vehicles, ship bottoms and pipelines.

6. Use of the drag reducing dispersion of claim 5, characterized in that: The drag-reducing dispersion liquid is applied to the drag reduction of underwater vehicles, ship bottoms and pipelines.

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