Blockage-degree-adjustable blockage mixture for evaluating dredging performance of pipeline dredging agent and preparation method of blockage mixture

Abstract

The invention provides a blockage degree-adjustable blockage mixture for evaluating the dredging performance of a pipeline dredging agent and a preparation method of the blockage mixture. The blockage degree-adjustable blockage mixture comprises the following components: grease, hair, paper scraps, ground meat, modified chitosan and crushed vegetable leaves. The preparation method comprises the following steps: firstly, carrying out free radical polymerization on acrylamide, acrylic acid, hydroxyl vinyl chloride-vinyl acetate resin and chitosan to obtain modified chitosan, so that the modified chitosan contains structures of acrylamide, acrylic acid and the like and a hydroxyl vinyl chloride-vinyl acetate resin structure; on one hand, due to the introduction of acrylamide, acrylic acid and other structures, a large amount of hydroxyl, amino and other groups are introduced into the modified chitosan, the hydrogen bond density of the modified chitosan is improved, the compatibility between the modified chitosan and other components in a blocking mixture can be improved, and strong hydrogen bond interaction is easily formed between the modified chitosan and grease and crushed vegetable leaves; the compatibility between the blocking mixtures is further improved, and the blocking mixtures are prevented from being flushed to the bottom by water flow before testing and the grease is prevented from being peeled off from the plastic pipe.

Description

Technical Field

[0001] The invention relates to the technical field of daily chemical washing, and mainly relates to a blocking mixture with adjustable blocking degree and used for evaluating the unblocking performance of a pipeline unblocking agent, and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization, the use of cement pipes, drainage systems, sewers and other facilities has increased significantly, and the problem of pipe blockage has become increasingly serious. According to a report released by China Research Institute of Industry, the global pipe dredging agent market size has grown from US$10.16 billion in 2015 to US$15.39 billion in 2020, with a compound annual growth rate of 8.6%. It is expected that by 2025, the global pipe dredging agent market size will reach US$19.71 billion, showing strong growth potential.

[0003] Therefore, major manufacturers have launched pipe unclogging agents, from the first generation of powders to the second generation of liquids and then to the third generation of gels; the products launched by domestic manufacturers all claim to have strong and fast-acting unclogging functions, but they lack relevant experimental tests and experimental data. At present, the "China Daily Chemical Industry Association's First Daily Chemical Industry Group Standard Review and Seminar in 2024" proposes to use only hair to simulate bathroom or basin sewer blockages, and use mixed blockages (including hair, paper towels, mixed oils, etc.) to simulate kitchen and bathroom sewer blockages; and often a single solubility test on hair or a mixture is difficult to achieve the actual condition of the actual sewer pipe, and it is also difficult to truly reflect the unclogging performance of pipe unclogging agent products. Among them, the preparation method of mixed blockage formula 1 is to add solidified mixed oil, hair, and paper towel into a beaker in turn. The three are independent and not mixed together; the preparation method of mixture formula 2 is to immerse hair and leek leaves in completely melted mixed oil. Although the three are mixed, a large amount of oil solidifies and protects the hair and leek leaves; the preparation method of mixed oil and wheat flour in formula 3 is the same as that of formula 2; these three mixed blockages are only suitable for solid pipe dredgers, and the dissolution test is carried out in a beaker, which cannot truly simulate the actual blockage of sewer pipes in kitchens, bathrooms, etc., and the blockages in bathrooms and kitchens need to be made and tested in two separate scenes, and the production and testing steps are relatively cumbersome.

[0004] Therefore, it is necessary to develop a blocking mixture that can simulate different blockage conditions of bathroom, kitchen and bathroom sewer pipes, can take into account multiple scenarios such as bathroom, kitchen and bathroom without separate testing, and can be suitable for the unclogging performance evaluation of solid and liquid pipe unclogging agents. Summary of the invention

[0005] The present invention provides a blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent has relatively high wall adhesion, and can cause different blocking effects by adjusting the amount of grease added and the order of addition, thereby avoiding the situation where a large amount of grease solidifies and wraps around other blockages to affect the test effect, and can simultaneously simulate the actual situation of stains and blockages in sewer pipes in home kitchens, bathrooms, etc., without the need to perform different tests in different scenarios; and the preparation method is simple and easy to operate, and has good application prospects.

[0006] One object of the present invention is to provide a blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent and a preparation method thereof. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent comprises the following components in mass fractions:

[0007]

[0008] The modified chitosan is obtained by reacting acrylamide, acrylic acid and hydroxychloroacetic acid resin with chitosan.

[0009] Furthermore, the molecular weight of the hydroxychloroacetic acid resin is 5000-50000.

[0010] Furthermore, the molecular weight of the chitosan is 5000-30000.

[0011] Furthermore, the oil is selected from one or more of vegetable oils and animal oils.

[0012] Furthermore, the oil is selected from one or more of the animal oils including tallow, mutton fat and lard.

[0013] Specifically, the oil is a general term for oils and fats. Generally, oils are liquid at room temperature, and fats are solid. The source of oils and fats can be animals or plants, among which animal oils and fats are generally solid at room temperature and liquid at high temperature. Therefore, grease can be used as the main component, and the physical properties of animal fat that becomes liquid at high temperature and solidifies at low temperature can be utilized. By controlling the added quality and order of grease, and then adding other components, the grease can be attached to the pipe wall and entangled with other components to different depths and thicknesses; to develop a blocking mixture with adjustable blocking degree for evaluating the unclogging performance of pipe unclogging agents, so that this type of stain can simultaneously meet the actual situation of stains in sewer pipes such as home bathrooms and kitchens, and can simulate different blockage conditions of sewer pipes, having a dual role, and this type of stain should have a relatively high adhesion to the pipe wall (reducing the probability of stains randomly falling into the pipe) to ensure that different conditions of the sewer pipe can be fully and effectively simulated, and the unclogging performance of the pipe unclogging agent can be tested more effectively and comprehensively, and the repeatability of the S-shaped plastic pipe simulation pipe experiment that was contaminated during the experiment is good, and it has the advantages of being simple and convenient to operate.

[0014] Furthermore, the fat content of the minced meat is ≤2%, and the fascia content is ≤1%.

[0015] Furthermore, the hair is selected from one or more of male hair and female hair.

[0016] Furthermore, the length of the hair is ≥5 cm and ≤10 cm.

[0017] Furthermore, the paper towel scraps are selected from wood pulp paper towels.

[0018] Furthermore, the minced meat is selected from one or more of pork and beef.

[0019] Furthermore, the chopped vegetable leaves are selected from one or more of pakchoy, bok choy, and Chinese cabbage.

[0020] Furthermore, the shredded vegetable leaves only take the vegetable leaves, without taking the veins and petioles.

[0021] The present invention also provides a method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents, comprising the following steps:

[0022] S1, adding acrylic acid, acrylamide, hydroxychloroacetic acid resin and chitosan into a solvent, mixing them evenly, adding an initiator under the protection of an inert gas, heating and reacting, and obtaining modified chitosan;

[0023] S2, heating the grease and mixing the modified chitosan with the grease, then adding the remaining ingredients, adding them into a sewer simulation instrument, stirring evenly, and obtaining the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of the pipeline unblocking agent.

[0024] Furthermore, in step S1, the heating temperature is 55-70°C.

[0025] Furthermore, in step S1, the mass ratio of acrylic acid, acrylamide and hydroxychloroacetic acid resin to chitosan is 1-3:3-5:0.2-0.5:1-3.

[0026] Furthermore, the initiator is selected from azobisisobutylamidine hydrochloride.

[0027] Furthermore, the sewer simulation instrument is an S-shaped plastic pipe with a diameter of 2-5 cm, a height of 19-25 cm, and a bottom length of 12-15 cm.

[0028] Specifically, the present invention selects a specific sewer simulation container, combines the main blockages of bathroom sewers, such as hair and paper towels, and the main blockages of kitchen and bathroom sewers, such as debris, mixed oil, modified chitosan, minced meat, and chopped vegetable leaves, and can simultaneously simulate sewer blockages in multiple scenarios such as bathrooms, kitchens, and bathrooms, making the unclogging performance test of pipe unclogging agents more concise and the blockages more in line with actual blockage conditions.

[0029] The present invention has the following beneficial effects:

[0030] The invention firstly performs free radical polymerization on acrylamide, acrylic acid and hydroxychloroacetate resin and chitosan to obtain modified chitosan, so that the modified chitosan contains structures such as acrylamide, acrylic acid and the structure of hydroxychloroacetate resin. On the one hand, due to the introduction of structures such as acrylamide and acrylic acid, a large number of groups such as hydroxyl groups and amino groups are introduced into the modified chitosan, and the hydrogen bond density of the modified chitosan is improved, which can not only improve the compatibility with other components in the blocking mixture, but also easily form a strong hydrogen bond effect with grease and vegetable shreds, further improve the compatibility between the blocking mixtures, and avoid the blocking mixture being washed to the bottom by water flow before testing and the grease peeling off from the plastic pipe. On the other hand, due to the introduction of the structure of hydroxychloroacetate resin, the modified chitosan and the plastic pipe have similar components, which is conducive to the modified chitosan and the grease adhering to the plastic pipe, making the grease less likely to peel off during testing, and more conducive to testing the pipeline dredging agent.

[0031] In addition, the present invention also simulates blockages in different scenarios by controlling the amount of oil and modified chitosan added and the order of adding different components, and can simulate the degree of blockage in different situations, making the test of the unblocking performance of the pipe unblocker more comprehensive, and the preparation method is simple and has high repeatability. The present invention can simulate different conditions from slight blockage to severe blockage by controlling the type, amount and order of addition of oil, test the reaction effect of the pipe unblocker under various conditions, simulate actual use conditions under different blockage degrees, and then test the performance of the pipe unblocker in different blockage scenarios, helping R&D personnel to evaluate its unblocking ability and stability in actual environments. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the technical solution of the present invention, the following examples are listed. Unless otherwise stated, the raw materials, reactions and post-treatment methods shown in the examples are common raw materials on the market and technical methods well known to those skilled in the art.

[0033] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0034] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers indicating, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all cases by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0035] Hydroxychloroacetate resin was purchased from Hubei Chushengwei Chemical Co., Ltd.

[0036] The molecular weight of chitosan is 5000-50000, and the degree of deacetylation is >90%.

[0037] The fats used are butter, mutton and lard, purchased from the local market.

[0038] The hair used is male hair and female hair, collected from offline hair salons.

[0039] The paper towel scraps were 100% virgin wood pulp paper towels purchased from Vinda Corporation.

[0040] The minced meat is beef leg meat purchased from the Man Ou Fu Fresh Flagship Store.

[0041] The chopped vegetable leaves were made from Chinese cabbage leaves purchased from Taobao.

[0042] 2,2'-Azo(2-methylpropylamidine) dihydrochloride, AIBA, initiator.

[0043] Example 1

[0044] A blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent and a preparation method thereof, comprising the following components in mass fractions:

[0045]

[0046]

[0047] The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents comprises the following steps:

[0048] S1. Using anhydrous ethanol as solvent, acrylic acid, acrylamide and hydroxychloroacetate resin were mixed with chitosan evenly. Under the protection of nitrogen, 2,2'-azo(2-methylpropylamidine) dihydrochloride was added and heated to 55°C. The mixture was reacted for 4 hours and dried to obtain modified chitosan.

[0049] The mass ratio of acrylic acid, acrylamide and hydroxychloroacetic acid resin to chitosan and 2,2'-azo(2-methylpropylamidine) dihydrochloride is 2:5:0.15:2.5:0.01;

[0050] S2-1. Heat to 70℃ according to the above mass fractions, melt butter, sheep fat and lard, mix the modified chitosan with the oil, add it into the sewer simulation instrument, and swing it horizontally to prevent a large amount of oil from solidifying and depositing at the bottom, so that it solidifies evenly on the bottom of the pipe and the wall of the pipe to form an oil film;

[0051] S2-2, mix the hair and paper scraps evenly, add 1 / 2 of the hair and paper scraps mixture into the sewer simulation instrument, and press it to the bottom of the sewer simulation instrument with a long tube;

[0052] S2-3, mix the minced meat and chopped vegetable leaves evenly, add them into the sewer simulation instrument, and press them to the bottom of the sewer simulation instrument with a long tube;

[0053] S2-4. Add the remaining ingredients into the sewer simulation instrument, press them to the bottom of the sewer simulation instrument, and stir them evenly to obtain the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of the pipeline unblocking agent.

[0054] Example 2

[0055] A blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent and a preparation method thereof, comprising the following components in mass fractions:

[0056]

[0057] The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents comprises the following steps:

[0058] S1. Using anhydrous ethanol as solvent, acrylic acid, acrylamide and hydroxychloroacetate resin were mixed with chitosan evenly. Under the protection of nitrogen, 2,2'-azo(2-methylpropylamidine) dihydrochloride was added, heated to 55°C, reacted for 4 hours, and dried to obtain modified chitosan;

[0059] The mass ratio of acrylic acid, acrylamide and hydroxychloroacetic acid resin to chitosan and 2,2'-azo(2-methylpropylamidine) dihydrochloride is 2:5:0.15:2.5:0.01;

[0060] S2-1. Mix the hair and paper scraps evenly according to the above mass fractions, add 1 / 2 of the hair and paper scraps mixture into the sewer simulation instrument, and press it to the bottom of the sewer simulation instrument with a long tube;

[0061] S2-2, mix the minced meat and chopped vegetable leaves evenly, add them into the sewer simulation instrument, and press them to the bottom of the sewer simulation instrument with a long tube;

[0062] S2-3, heat to 70℃, melt butter, sheep fat and lard, mix the modified chitosan with the grease, add it into the sewer simulation instrument, and swing it horizontally to avoid a large amount of grease solidifying and depositing at the bottom, so that it solidifies evenly on the bottom of the pipe and the wall of the pipe to form an oil film;

[0063] S2-4. Add the remaining ingredients into the sewer simulation instrument, press them to the bottom of the sewer simulation instrument, and stir them evenly to obtain the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of the pipeline unblocking agent.

[0064] Example 3

[0065] A blocking mixture with adjustable blocking degree for evaluating the unblocking performance of a pipeline unblocking agent and a preparation method thereof, comprising the following components in mass fractions:

[0066]

[0067] The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents comprises the following steps:

[0068] S1. Using anhydrous ethanol as solvent, acrylic acid, acrylamide and hydroxychloroacetate resin were mixed with chitosan evenly. Under the protection of nitrogen, 2,2'-azo(2-methylpropylamidine) dihydrochloride was added, heated to 55°C, reacted for 4 hours, and dried to obtain modified chitosan;

[0069] The mass ratio of acrylic acid, acrylamide and hydroxychloroacetic acid resin to chitosan and 2,2'-azo(2-methylpropylamidine) dihydrochloride is 2:5:0.15:2.5:0.01;

[0070] S2-1. Mix the hair and paper scraps evenly according to the above mass fractions, add 1 / 2 of the hair and paper scraps mixture into the sewer simulation instrument, and press it to the bottom of the sewer simulation instrument with a long tube;

[0071] S2-2, mix the minced meat and chopped vegetable leaves evenly, add them into the sewer simulation instrument, and press them to the bottom of the sewer simulation instrument with a long tube;

[0072] S2-4, add the remaining hair and paper scraps mixture into the sewer simulation instrument, press it to the bottom of the sewer simulation instrument, and stir evenly;

[0073] S2-3. Heat to 70°C, melt the butter, mutton fat and lard, mix the modified chitosan with the oil, add it together with the remaining ingredients into a sewer simulation instrument, and swing it left and right to prevent a large amount of oil from solidifying and depositing at the bottom, so that it solidifies evenly on the bottom of the pipe and the wall of the pipe to form an oil film, to obtain the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipe unblocking agents.

[0074] Comparative Example 1

[0075] The difference between this comparative example and Example 1 is that the modified chitosan is replaced by unmodified chitosan, and the other components and preparation method are the same as those in Example 1.

[0076] Comparative Example 2

[0077] The difference between this comparative example and Example 1 is that in step S1, methyl methacrylate of equal mass is used to replace the hydroxychloroacetic acid resin, and the other components and preparation method are the same as those in Example 1.

[0078] Test Example 1

[0079] The plugging mixtures of Examples 1-3 and Comparative Examples 1-2 were subjected to a fouling evaluation test to test their adhesion and degree of plugging.

[0080] Test method:

[0081] A total of 12 S-shaped plastic tubes with a diameter of 2 cm, a height of 21 cm, and a bottom length of 14.5 cm were prepared, and 3 S-shaped plastic tubes were set in each group, and a total of 4 groups were set, corresponding to Examples 1-3 and Comparative Examples 1-2 respectively. The mass of stain added to each S-shaped plastic tube was 6.25 g, and the plugging mixture was prepared according to the composition, mass fraction and preparation method in Table 1 for use.

[0082] Adhesion test: Use an iron stand to clamp the S-shaped plastic tube containing the blocking mixture, use a 500mL beaker to fill 300mL of tap water, and quickly pour 300mL of tap water into the S-shaped plastic tube. If the blocking mixture is not washed away to the bottom of the S-shaped plastic tube by water, it is qualified. In order to test the repeatability of adhesion, the above experimental repeatability test is performed 3 times, recorded as 1#, 2#, and 3#.

[0083] Blockage degree test: Use an iron stand to set up the S-shaped plastic tube containing the blocking mixture, use a rubber stopper to tightly block the lower outlet of the S-shaped plastic tube, use a 300mL beaker to take 150mL of tap water, and slowly pour it into the S-shaped plastic tube along the upper inlet. At this time, due to atmospheric pressure, the tap water cannot completely immerse the mixed blockage. Loosen the rubber stopper at the lower outlet and record the time required for the tap water to completely immerse the blocking mixture. If the time is ≤6s, it is a slight blockage; if 6s < time ≤12s, it is a general blockage; if 12s < time ≤24s, it is a serious blockage; if the time is >28s or the tap water cannot completely immerse the mixed blockage, it is a complete blockage. In order to test the repeatability of the blockage degree, the above experimental repeatability test was performed 3 times, recorded as 1#, 2#, and 3#.

[0084] The test results are shown in Table 1.

[0085] Table 1 Fouling evaluation test results of the plugging mixtures of Examples 1-3 and Comparative Examples 1-2

[0086]

[0087] As can be seen from Table 1, through the adhesion test, the adhesion of the blocking mixtures of Examples 1-3 is qualified; through the blockage degree test, it can be found that there are significant differences in the blockage degrees of the blocking mixtures of Examples 1-3, indicating that the blocking mixture can adjust the blockage degree of the blockage by adjusting the content of grease and modified chitosan, and changing the order of adding different components, and achieve different blockage degrees. In the repeatability test of the adhesion and blockage degree of the blocking mixtures of Examples 1-3, the repeatability test results show that the adhesion and blockage degree of the blocking mixtures with the same components and the same production process are not significantly different, indicating that the repeatability of the blocking mixture is good. This shows that the blocking mixture prepared by the technical solution of the present invention for the unblocking performance test of the pipeline unblocker has strong adhesion and can meet the unblocking performance test requirements of the pipeline unblocker, and can adjust the blockage degree of the mixed blockage by adjusting the content of grease and modified chitosan, and changing the order of adding different components, and the repeatability is stronger, and the unblocking ability of the pipeline unblocker is evaluated more conveniently and comprehensively;

[0088] However, the adhesion of the plugging mixtures of Comparative Examples 1-2 was unqualified, and a large amount of the mixed oil basically fell off. The plugging degree of the plugging mixtures was significantly worse than that of Example 1, and there was no obvious difference, which made it difficult to meet the use requirements.

[0089] Test Example 2

[0090] The blocking mixtures of Examples 1-3 and Comparative Examples 1-2 were subjected to a test for evaluating the unclogging performance of pipeline unclogging agents.

[0091] Test method:

[0092] Each pipe dredging agent sample is prepared with 12 S-shaped plastic tubes with a diameter of 2 cm, a height of 21 cm, and a bottom length of 14.5 cm. Three S-shaped plastic tubes are set in each embodiment and comparative example, and are tested separately, and are recorded as 1#, 2#, and 3# respectively. The plugging mixture is prepared according to the composition, mass fraction and preparation method in Table 1 for use.

[0093] Use an iron stand to clamp the S-shaped plastic tubes containing the blocking mixture, and use a rubber stopper to tightly plug the bottom of the S-shaped plastic tube. Weigh 30g of each pipe dredging agent sample (the formula ingredients of the pipe dredging agent are shown in Table 3) (wherein 10g of the solid pipe dredging agent is weighed and 30mL of deionized water is added), slowly pour it from the upper inlet of the S-shaped plastic tube, open the rubber stopper at the lower outlet, so that the pipe dredging agent sample is completely immersed in the blocking mixture, plug the rubber stopper, and soak for reaction for 8h; after the sample soaking reaction time is over, use 500mL of tap water to flush out the blocking mixture in the S-shaped plastic tube, and use a sieve to catch the blocked mixture after the reaction at the bottom, observe the situation of the mixed blockage flushed out, and determine whether the unblocking performance of the pipe dredging agent is qualified. Refer to Table 2 below for the evaluation criteria (in order to facilitate the subsequent performance test results of the pipe dredging agent, the corresponding experimental phenomenon is assigned a score, and the score is used to represent the experimental phenomenon).

[0094] The test results of the pipeline dredging agent's dredging performance are shown in Table 4.

[0095] Table 2 Evaluation criteria for pipeline dredging agent dredging performance

[0096]

[0097]

[0098] Table 3 Pipeline dredging agent formula ingredients

[0099]

[0100]

[0101] Table 4 Detergent cleaning power evaluation test results (%)

[0102]

[0103] As can be seen from Table 4, the unblocking performance test of different types of pipeline dredging agents was carried out and the phenomenon after the test was observed. The unblocking performance of different types of pipeline dredging agents in the blocking mixtures of Examples 1-3 was significantly different from that of the blank group and different types of pipeline dredging agents, which was in line with the unblocking performance change trend of different types of pipeline dredging agents. That is to say, by adjusting the content of grease and modified chitosan, and changing the order of adding different components, the blockage degree of the blockage can be adjusted to achieve different blockage degrees, thereby meeting the requirements of the pipeline dredging agent for the unblocking performance test, and can simultaneously meet the unblocking performance test of different types of pipeline dredging agents; and in the repeated tests of the unblocking performance of the same type of pipeline dredging agent, there was no obvious difference in the unblocking performance, and the repeatability of the blocking mixture was good. In the same blocking mixture of Examples 1-3, there are obvious differences in the unblocking performance of different types of pipeline dredging agents. In the same type of pipeline dredging agent, the unblocking performance of the pipeline dredging agent in different embodiments is also significantly different; but in the repeated test of the unblocking performance of the pipeline dredging agent, there is no obvious difference in the unblocking performance; that is, by changing the content of grease and modified chitosan, and changing the order of adding different components to achieve a blocking mixture with different blockage degrees, it can also meet the requirements of different types of pipeline agents for unblocking performance testing, and at the same time can meet the requirements of the unblocking performance testing of the same type of pipeline dredging agent for different blockage degrees, and the repeatability of the blocking mixture is good, and the same type of blocking mixture will not show large differences when the same type of pipeline dredging agent is tested multiple times. Therefore, when the blocking mixture is applied to the unblocking performance test of pipeline dredging agents, it can be simultaneously applied to the unblocking performance evaluation of different types of unblocking agents for solid and liquid pipelines, which is more convenient and more suitable for the unblocking performance test of pipeline dredging agents.

[0104] However, since the blocking mixture of Example 1-2 has insufficient adhesion to the S-shaped plastic pipe, the mixed oil stains easily fall off the side wall of the plastic pipe. As a result, there is no obvious difference in the unclogging performance between the blocking mixture of Example 1-2 and the different types of pipe unclogging agents compared with the blank group and different types of pipe unclogging agents, making it difficult to perform performance evaluation on different types of pipe unclogging agents.

[0105] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0106] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents, characterized in that: The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents comprises the following components by mass fraction: The modified chitosan is obtained by reacting acrylamide, acrylic acid and hydroxychloroacetic acid resin with chitosan.

2. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents according to claim 1, characterized in that: The molecular weight of the hydroxychloroacetic acid resin is 5000-50000.

3. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents according to claim 1, characterized in that: The molecular weight of the chitosan is 5000-30000.

4. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents according to claim 1, characterized in that: The oil is selected from one or more of vegetable oil and animal oil.

5. The blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agents according to claim 1, characterized in that: The fat rate of the minced meat is ≤2%, and the fascia rate is ≤1%.

6. The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agent according to any one of claims 1 to 5, characterized in that: The steps include: S1, adding acrylic acid, acrylamide, hydroxychloroacetic acid resin and chitosan into a solvent, mixing them evenly, adding an initiator under the protection of an inert gas, heating and reacting, and obtaining modified chitosan; S2, heating the oil and mixing the modified chitosan with the oil, adding the mixture into a sewer simulation instrument, and making the mixture solidify evenly on the bottom of the pipe and the wall of the pipe to form an oil film; S3, adding part of the hair and part of the paper scraps into the sewer simulation instrument; S3, adding part of the minced meat and part of the chopped vegetable leaves into the sewer simulation instrument; S4. Add the remaining ingredients into the sewer simulation instrument, press them to the bottom of the sewer simulation instrument, and stir them evenly to obtain the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of the pipeline unblocking agent.

7. The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agent according to claim 6, characterized in that: In step S1, the heating temperature is 55-70°C.

8. The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agent according to claim 6, characterized in that: In step S1, the mass ratio of acrylic acid, acrylamide and hydroxychloroacetic acid resin to chitosan is 1-3:3-5:0.2-0.5:1-3.

9. The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agent according to claim 6, characterized in that: The initiator is selected from azobisisobutyramidine hydrochloride.

10. The method for preparing the blocking mixture with adjustable blocking degree for evaluating the unblocking performance of pipeline unblocking agent according to claim 6, characterized in that: The sewer simulation instrument is an S-shaped plastic pipe with a diameter of 2-5 cm, a height of 19-25 cm, and a bottom length of 12-15 cm.

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