A low vacuum pipeline concrete dust suppression material and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and specifically relates to a low-vacuum pipeline concrete dust suppression material and a preparation method thereof. The material is prepared from the following raw materials in percentage by weight: polyacrylate emulsion: 30-60%; polyvinyl alcohol 15-45%; silica sol 10-20%; sodium silicate 5-15%; auxiliary agent 4-10%; surfactant 0.5-5%; defoamer 0.05-1%; the sum of the percentages by weight of the above raw materials is 100%. The dust suppression material has excellent comprehensive performance by adopting specific components and proportions, that is, obvious dust suppression effect, good wetting effect, good film-forming effect, high shell film compressive strength, good durability, etc., providing excellent guarantee for dust suppression, durability and environmental safety of low-vacuum pipeline concrete.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and in particular relates to a low vacuum pipeline concrete dust suppression material and a preparation method thereof. Background Art

[0002] In recent years, many problems caused by dust have attracted much attention. Dust suppression materials can quickly capture and firmly adsorb fine dust particles to play a role in dust suppression and dust prevention. However, there are more stringent requirements when using dust suppression materials in a low vacuum environment. For example, the wettability of concrete dust is not as good as that of soil dust. The smaller the particle size, the less likely it is to be wetted. At the same time, according to Dalton's law of partial pressure, the evaporation rate of water is inversely proportional to the air pressure. The air pressure inside the vacuum pipeline of the ultra-high-speed magnetic levitation transportation system is dozens or even hundreds of times lower than that in the plateau area. While the application conditions of dust suppression materials are relatively more severe, there are also higher requirements for their dust suppression effect, anti-evaporation, adhesion, environmental protection, etc. Existing dust suppression materials are difficult to achieve good dust suppression effects in special low vacuum environments. Therefore, it is urgent to propose a new dust suppression material to solve such dust problems, prevent concrete from collapsing and lack of durability, and improve the environmental conditions inside the vacuum pipeline. Summary of the invention

[0003] The object of the present invention is to provide a low vacuum pipeline concrete dust suppression material and a preparation method thereof, so as to improve the above-mentioned problems.

[0004] In order to achieve the above objectives, the present application provides the following technical solutions:

[0005] On the one hand, an embodiment of the present application provides a low vacuum pipe concrete dust suppression material, including: polyacrylate emulsion: 30-60%; polyvinyl alcohol 15-45%; silica sol 10-20%; sodium silicate 5-15%; auxiliary agent 4-10%; surfactant 0.5-5%; defoaming agent 0.05-1%; the sum of the weight percentages of the above raw materials is 100%.

[0006] Furthermore, the mass ratio of the polyacrylate emulsion to polyvinyl alcohol is 1:2 to 3:1.

[0007] Furthermore, the polyacrylate emulsion has a solid content of 39-55 wt % and a viscosity of 2000-4000 mPa·s.

[0008] Furthermore, the molecular weight of the polyvinyl alcohol is 70,000-100,000, and the alcoholysis degree is 80-99.5%.

[0009] Furthermore, the modulus of the sodium silicate ranges from 2.6 to 3.3.

[0010] Furthermore, the surfactant is selected from anionic surfactants, nonionic surfactants or a mixture of the two.

[0011] Furthermore, the anionic surfactant is selected from one or a combination of at least two of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium lignin sulfonate, and sodium alginate; and the nonionic surfactant is fatty alcohol polyoxyethylene ether.

[0012] Furthermore, the surfactant is sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether in a weight ratio of 1:1-4.

[0013] In a second aspect, an embodiment of the present application provides a method for preparing a low vacuum pipeline concrete dust suppression material, the method comprising:

[0014] S1: dissolving 8% polyvinyl alcohol by mass in hot water and letting it stand;

[0015] S2: stirring and dispersing the polyacrylate emulsion, and then adding the polyvinyl alcohol solution and mixing and stirring to obtain a mixed solution;

[0016] S3: Add sodium silicate to the mixed solution and stir for 5 minutes, dropwise add half the dose of defoamer, then add silica sol and other raw materials, stir rapidly (1200 rpm) for 5 minutes, mix well and let stand to obtain the finished product.

[0017] The beneficial effects of the present invention are:

[0018] The present invention adopts polyacrylate and polyvinyl alcohol polymer materials, which have good film-forming properties and high viscosity, play a role in increasing the bonding between particles, forming a shell surface, with the main purpose of improving the surface strength of the hard shell, improving the dust suppression effect, and having good thermal stability. The sodium silicate used not only has water absorption performance, but also plays a synergistic bonding role with polyvinyl alcohol, and has an excellent dust suppression effect; the silica sol has a large specific surface area and adsorption capacity, good adhesion and good dispersibility, can be fully immersed and filled into solids, especially porous materials, and make their surfaces smooth. The hydrophilic group in the surfactant can make the hydrophilic property of the surfactant play a decisive role in reducing the surface tension of the solution. At the same time, the use of hygroscopic inorganic salts has the characteristic of being able to make up for the inherent weak moisture absorption and water retention of the material, and its moisture absorption capacity is long-lasting, thereby being able to improve the dust suppression effect of the surfactant, and at the same time, it cooperates with polyvinyl alcohol to retain water and resist evaporation, greatly improving the dust suppression efficiency of the dust suppression material.

[0019] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 The present invention is a flowchart of a method for preparing a low vacuum pipeline concrete dust suppression material according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram of the surface film formation of Example 1 described in the embodiments of the present invention.

[0023] Figure 3 It is a schematic diagram of the surface film formation of Comparative Example 1 described in the embodiments of the present invention.

[0024] Figure 4 It is a schematic diagram of the surface film formation of Comparative Example 2 described in the embodiments of the present invention. DETAILED DESCRIPTION

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0026] Unless otherwise specified, the raw materials in the examples of this application were purchased from commercial sources. Unless otherwise specified, the test methods all adopted conventional methods, and the instruments all adopted the configuration recommended by the manufacturer.

[0027] In recent years, many problems caused by dust have attracted much attention. Dust suppression materials can quickly capture and firmly adsorb fine dust particles, playing a role in dust suppression and dust prevention. Existing dust suppression materials can be roughly divided into moistening type, bonding type, moisture absorption and moisturizing type and multifunctional composite type. Most of them have single functions, and there are few reports on composite dust suppression materials. As the requirements of various industries for dust suppression materials continue to increase, traditional single-function dust suppression materials can no longer meet the needs, and then composite and new dust suppression materials have developed rapidly. Such materials are mainly designed and constructed by increasing the dust particle size through binders, providing continuous liquid bridge force through water retaining agents, and enhancing the formation of liquid bridge force through wetting agents. At the same time, they take into account safety, dust suppression efficiency, usability and cost.

[0028] However, there are more stringent requirements when using dust suppression materials in a low vacuum environment. For example, the wettability of concrete dust is not as good as that of soil dust, and the smaller the particle size, the less likely it is to be wetted. At the same time, according to Dalton's law of partial pressure, the evaporation rate of water is inversely proportional to the air pressure. The air pressure inside the vacuum pipeline of the ultra-high-speed magnetic levitation transportation system is dozens or even hundreds of times lower than that in the plateau area. While the application conditions of dust suppression materials are relatively more severe, there are also higher requirements for their dust suppression effect, anti-evaporation, adhesion, environmental protection, etc. There is still a blank in the application examples of existing dust suppression materials in this special low vacuum environment. Therefore, it is urgent to propose a new dust suppression material that can play a dust suppression effect in a low vacuum environment to solve such dust problems, prevent concrete from collapsing and lack of durability, and improve the environmental conditions inside the vacuum pipeline.

[0029] The above-mentioned low vacuum pipeline concrete dust suppression material is prepared from the following raw materials in percentage by weight:

[0030] Polyacrylate emulsion: 30-60%;

[0031] Polyvinyl alcohol 15-45%;

[0032] Silica sol 10-20%;

[0033] Sodium silicate 5-15%;

[0034] Auxiliary agent 4-10%;

[0035] Surfactant 0.5-5%;

[0036] Defoaming agent 0.05-1%;

[0037] The sum of the weight percentages of the above raw materials is 100%.

[0038] The above formula is composed of polyacrylate emulsion, polyvinyl alcohol, small molecule hygroscopic moisturizer and surfactant, etc., which can effectively capture, adsorb and agglomerate dust particles, and also has the functions of wetting, hygroscopic and anti-corrosion, etc., and can form a protective layer with high strength on the concrete surface, and has good temperature resistance, fast penetration, long duration, and can achieve good economic benefits. It should be noted that the dust suppression effect of the present invention is not achieved by the simple superposition of various components, but by the organic coordination and synergy of various components, that is, each component not only plays a single main function, but also plays a secondary function, and the secondary function may be completed in coordination with other components.

[0039] In order to obtain higher dust suppression efficiency, better moisturizing effect, etc., the ingredients of the above formula are further selected from the following types:

[0040] Furthermore, the mass ratio of the polyacrylate emulsion to polyvinyl alcohol is 1:2 to 3:1.

[0041] Furthermore, the polyacrylate emulsion has a solid content of 39-55 wt % and a viscosity of 2000-4000 mPa·s.

[0042] Furthermore, the molecular weight of the polyvinyl alcohol is 70,000-100,000, and the alcoholysis degree is 80-99.5%. Furthermore, the molecular weight of the polyvinyl alcohol is 72,000-81,000, and the alcoholysis degree is 97-99.5%.

[0043] Furthermore, the modulus of the sodium silicate is in the range of 2.6 to 3.3, and it is a colorless transparent liquid. Furthermore, the modulus of the sodium silicate is 3.0.

[0044] Furthermore, the silica sol is alkaline, has a solid content of 35-40%, and is a milky white liquid.

[0045] Furthermore, the surfactant is selected from anionic surfactants, nonionic surfactants or a mixture of the two.

[0046] Furthermore, the anionic surfactant is selected from one or a combination of at least two of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium lignin sulfonate, and sodium alginate; the nonionic surfactant is fatty alcohol polyoxyethylene ether, and further, the anionic surfactant is selected from one or two of sodium dodecylbenzene sulfonate and sodium alginate, and the molecular weight of the fatty alcohol polyoxyethylene ether is 300-350.

[0047] Furthermore, the surfactant is sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether in a weight ratio of 1:1-4. Further, the surfactant is sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether in a weight ratio of 1:4.

[0048] In the present application, the method for preparing the low vacuum pipeline concrete dust suppression material comprises the following steps:

[0049] S1: dissolving 8% polyvinyl alcohol by mass in hot water and letting it stand;

[0050] S2: stirring and dispersing the polyacrylate emulsion, and then adding the polyvinyl alcohol solution and mixing and stirring to obtain a mixed solution;

[0051] S3: Add sodium silicate to the mixed solution and stir for 5 minutes, dropwise add half the dose of defoamer, then add silica sol and other raw materials, stir rapidly (1200 rpm) for 5 minutes, mix well and let stand to obtain the finished product.

[0052] The temperature of the hot water in step S1 is 90-95°C. The solubility of polyvinyl alcohol in water is related to its alcoholysis degree: when the alcoholysis degree is 86%-89%, the water solubility is the best, and it can be quickly dissolved in both cold water and hot water; when the alcoholysis degree is above 90%, in order to completely dissolve, it is generally necessary to heat to 60-70°C; when the alcoholysis degree reaches above 99%, it is only soluble in hot water above 95°C.

[0053] The above method only involves simple physical mixing, so it is simple to operate, does not require harsh reaction conditions, has low cost, and is easier to promote. Since the concrete dust suppression material of the present invention has significant advantages in adhesion, wettability, film-forming property, and film strength, it has stable and strong adsorption function for dust of different particle size ranges and has good market applicability.

[0054] In order to further understand the present application, the low vacuum pipeline concrete dust suppression material and the preparation method thereof provided by the present invention are described below in conjunction with embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0055] Example 1: Preparation of 1# concrete dust suppression material

[0056] Dissolve polyvinyl alcohol in hot water, then let it stand for a while to prepare 23g of 8% polyvinyl alcohol solution; stir and disperse 46g of polyacrylate emulsion slowly (300rpm) for 3 minutes, then add the above 23g of polyvinyl alcohol solution and mix and stir in proportion, then add 9g of sodium silicate and stir slowly (500rpm) for 5 minutes, add 0.05g of defoamer dropwise, and then add 15.3g of silica sol and the remaining raw materials (6g of magnesium sulfate, 0.6g of sodium dodecylbenzene sulfonate, 0.05g of defoamer) and stir quickly (1200rpm) for 5 minutes, then mix and stand to obtain the dust suppression material.

[0057] Example 2: Preparation of 2# concrete dust suppression material

[0058] Dissolve polyvinyl alcohol in hot water, then let it stand for a while to prepare 44.5g of 8% polyvinyl alcohol solution; stir and disperse 33.4g of polyacrylate emulsion slowly (300rpm) for 3 minutes, then add the above 44.5g of polyvinyl alcohol solution and mix and stir in proportion, then add 6.2g of sodium silicate and stir slowly (500rpm) for 5 minutes, add 0.025g of defoamer dropwise, and then add 11.13g of silica sol and the remaining raw materials (4.1g of magnesium sulfate, 0.62g of sodium dodecylbenzene sulfonate, 0.025g of defoamer) and stir quickly (1200rpm) for 5 minutes, then mix and stand to obtain the dust suppression material.

[0059] Example 3: Preparation of 3# concrete dust suppression material

[0060] Dissolve polyvinyl alcohol in hot water, and then let it stand for a while to prepare 37.2g of polyvinyl alcohol solution with a mass fraction of 8%; slowly (300rpm) stir and disperse 37.2g of polyacrylate emulsion for 3 minutes, then add the above 37.2g of polyvinyl alcohol solution and mix and stir in proportion, then add 7.5g of sodium silicate and slowly (500rpm) stir for 5 minutes, drop 0.1g of defoamer, and then add 12.4g of silica sol and the remaining raw materials (5.0g of magnesium sulfate, 0.5g of sodium dodecylbenzene sulfonate, 0.1g of defoamer) and quickly (1200rpm) stir for 5 minutes, mix and stand to obtain dust suppression material.

[0061] Example 4: Preparation of 4# concrete dust suppression material

[0062] Same as Example 1, except that sodium dodecylbenzene sulfonate is replaced by sodium alginate.

[0063] Example 5: Preparation of 5# concrete dust suppression material

[0064] Same as Example 1, except that sodium dodecylbenzene sulfonate is replaced by fatty alcohol polyoxyethylene ether.

[0065] Example 6: Preparation of 6# concrete dust suppression material

[0066] The difference from Example 1 is that sodium dodecylbenzene sulfonate is replaced by a mixture of sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether, the weight ratio of the two is 1:4, and 0.25wt% of polyethylene glycol octylphenyl ether auxiliary agent is added.

[0067] Comparative Example 1: Preparation of D1# concrete dust suppression material

[0068] 60g of polyacrylate emulsion was slowly stirred (300rpm) for 3 minutes, then 11.2g of sodium silicate was added and slowly stirred (500rpm) for 5 minutes, 0.15g of defoamer was added dropwise, and 20g of silica sol and the remaining raw materials (7.4g of magnesium sulfate, 1.1g of sodium dodecylbenzene sulfonate, 0.15g of defoamer) were added, and the mixture was quickly stirred (1200rpm) for 5 minutes, mixed and allowed to stand to obtain the dust suppression material.

[0069] Comparative Example 2: Preparation of D2# concrete dust suppression material

[0070] The same as comparative example 1, except that the added 60 g polyacrylate emulsion is replaced by 60 g polyvinyl alcohol.

[0071] Comparative Example 3: Preparation of D3# concrete dust suppression material

[0072] Dissolve polyvinyl alcohol in hot water, then let it stand for a while to prepare 39.9g of 8% polyvinyl alcohol solution; slowly (300rpm) stir and disperse 39.9g of polyacrylate emulsion for 3 minutes, then add the above 39.9g of polyvinyl alcohol solution and mix and stir in proportion, then add 13.3g of silica sol and the remaining raw materials (6.7g of magnesium sulfate, 0.13g of sodium dodecylbenzene sulfonate, 0.07g of defoaming agent) and stir quickly (1200rpm) for 5 minutes, then mix and stand to obtain dust suppression material.

[0073] Comparative Example 4: Preparation of D4# concrete dust suppression material

[0074] Dissolve polyvinyl alcohol in hot water, then let it stand for a while to prepare 17.4g of polyvinyl alcohol solution with a mass fraction of 8%; stir and disperse 17.4g of polyacrylate emulsion slowly (300rpm) for 3 minutes, then add the above 17.4g of polyvinyl alcohol solution and mix and stir in proportion, then add 34.7g of sodium silicate and stir slowly (500rpm) for 5 minutes, add 0.05g of defoamer dropwise, and then add 5.8g of silica sol and the remaining raw materials (21.4g of magnesium sulfate, 3.2g of sodium dodecylbenzene sulfonate, 0.05g of defoamer) and stir quickly (1200rpm) for 5 minutes, then mix and stand to obtain the dust suppression material.

[0075] The present application illustrates the beneficial effects of the dust suppression material of the present invention by performing performance tests on the materials of Examples 1-6 and Comparative Examples 1-4 of the present application.

[0076] According to GB / T17671-1999 "Test Method for Strength of Cement Mortar", the mortar was subjected to standard curing for 7 days. After the curing was completed, the test pieces were taken for testing. The concrete dust suppression materials prepared in Examples 1-6 and Comparative Examples 1-4 were smeared and dried on the surface of the mortar test pieces to form a fixed layer mold. Some of the test pieces were moved into a vacuum curing box, i.e., relevant tests were carried out under an environment of (100-500) Pa. Table 1 shows the mortar mix ratio.

[0077] Table 1 Mortar mix ratio (unit: kg / m3)

[0078] cement sand water Water reducing agent 720 1440 216 3.6

[0079] The performance test specifically includes: the mortar surface forming mold effect and moisture retention rate, compressive strength and dust suppression efficiency, wherein the test method of the mortar surface forming mold effect and moisture retention rate test is: the dust suppression materials of Examples 1-6 and Comparative Examples 1-4 are respectively applied, and the surface film formation of the mortar after use is observed. After it slowly penetrates into the mortar and the outer surface is dry, the test piece is placed in a low vacuum environment for further drying, and the mass of the test piece is weighed every 12 hours. The moisture retention rate of the test piece is calculated according to the following formula:

[0080]

[0081] In the above formula, α is the moisture retention rate (%); m o is the mass of the specimen after applying dust suppression material (g); m i is the mass (g) of the test piece after drying for the ith hour; m is the mass (g) of the test piece without dust suppression material. The moisture retention performance of the dust suppression materials of the embodiments of the present invention and the comparative examples was tested by the above method, and the test results are shown in Table 1.

[0082] The compressive strength test is carried out on mortar specimens under different treatment conditions according to GB / T17671-1999 "Test Method for Strength of Cement Mortar". The test process is a technical solution well known to those skilled in the art, so it will not be described here. The test results are shown in Table 2.

[0083] Dust suppression efficiency is one of the most important performance indicators of dust suppression materials. The larger the dust suppression efficiency value, the better the dust suppression effect. The test method of the dust suppression efficiency test is as follows: take some mortar specimens of the above-mentioned embodiments 1-6 and comparative examples 1-4 to form a fixed layer mold, bake them in a 70°C oven for 180 minutes, and then weigh them respectively, wherein the mass of the specimens before weighing is recorded as w1, and then put them in front of the hair dryer, and the specimens are blown for t min under the condition of a wind speed of 30m / s, and then weighed respectively, and the mass of the specimens at this time is recorded as w2, and the wind erosion rate is calculated according to the following formula:

[0084]

[0085] In the above formula, β is the wind erosion rate (%); w1 is the mass of the specimen before erosion (g); w2 is the mass of the specimen after erosion (g). The wind erosion rate of specimen 1 is E1, and the wind erosion rate of specimen 2 is E2. The average value is taken as E. Then the dust suppression efficiency is calculated according to the following formula:

[0086] Dust suppression efficiency = 1-E

[0087] According to the above method, the dust suppression efficiency of the dust suppression materials described in Examples 1-6 of the present invention and Comparative Examples 1-4 were tested respectively. The experimental results are shown in Table 1.

[0088] Table 1 Test results of Examples 1-6 and Comparative Examples 1-4

[0089]

[0090]

[0091] The following conclusions can be drawn from Table 1:

[0092] 1. The results of the surface molding conditions show that the dust suppression materials described in Examples 1 to 6 of the present invention all have good film-forming effects, which are beneficial to water retention and reducing water evaporation, thereby ensuring that the loss of concrete quality is controlled and the loss is reduced. Figure 2 Schematic diagram of the surface film formation corresponding to Example 1, Figure 3 4 is a schematic diagram of the surface film formation corresponding to Comparative Example 2.

[0093] 2. The results of the moisture retention rate show that under the optimized composition and ratio conditions, the dust suppression materials of Examples 1-6 of the present invention have good moisture retention performance, and the moisture retention rate can reach more than 39%, which is much better than the moisture retention performance of Comparative Examples 1-4, and is more conducive to achieving better dust suppression effect.

[0094] 3. The results of the 7d compressive strength of the mortar obtained from the concrete dust suppression materials in Examples 1-6 and Comparative Examples 1-4 show that the maximum 7d mortar compressive strength of the dust suppression materials in Examples 1-6 is 13.3MPa, and the minimum is 11.0MPa; while the maximum 7d mortar compressive strength of the dust suppression materials in Comparative Examples 1-4 is 9.5MPa, and the minimum is 9.1MPa. From the above, it can be seen that the 7d mortar compressive strength of the dust suppression materials prepared by this embodiment is better than the 7d compressive strength of the comparative example when the standard is met. At the same time, compared with Comparative Examples 1-4, Examples 1-6 also verify that the shell membrane compressive strength of the concrete dust suppression materials and preparation methods of the present invention is high.

[0095] 4. The dust suppression efficiency results show that compared with comparative examples 1-4, the dust suppression materials described in Examples 1-6 of the present invention have better dust suppression effects, with a total dust suppression efficiency of more than 90%. Their good water retention and bonding effects can continue to maintain dust suppression effects for a long time, which is beneficial to environmental improvement and protection. It can be seen that the use of the suppression material on the surface of the test piece can form a shell mold on the surface within a certain period of time, which plays a role in controlling dust and preventing dust.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0097] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A low vacuum pipeline concrete dust suppression material, It is characterized in that It is prepared from the following raw materials in weight percentage: Polyacrylate emulsion: 30-60%; Polyvinyl alcohol solution 15-45%; Silica sol 10-20%; Sodium silicate 5-15%; Auxiliary agent 4-10%; Surfactant 0.5-5%; Defoaming agent 0.05-1%; The sum of the weight percentages of the above raw materials is 100%; Wherein, the mass fraction of polyvinyl alcohol solution is 8%; Wherein, the auxiliary agent is magnesium sulfate.

2. The low vacuum pipeline concrete dust suppression material according to claim 1, Features: The polyacrylate emulsion has a solid content of 39-55 wt % and a viscosity of 2000-4000 mPa·s.

3. The low vacuum pipeline concrete dust suppression material according to claim 1, Features: The molecular weight of the polyvinyl alcohol is 70,000-100,000, and the alcoholysis degree is 80-99.5%.

4. The low vacuum pipeline concrete dust suppression material according to claim 1, Features: The modulus of the sodium silicate ranges from 2.6 to 3.

3.

5. The low vacuum pipeline concrete dust suppression material according to claim 1, Features: The surfactant is selected from anionic surfactants, nonionic surfactants or a mixture of the two.

6. The low vacuum pipeline concrete dust suppression material according to claim 5, Features: The anionic surfactant is selected from one or a combination of at least two of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate, sodium dodecyl sulfate, sodium lignin sulfonate, and sodium alginate; and the nonionic surfactant is fatty alcohol polyoxyethylene ether.

7. The low vacuum pipeline concrete dust suppression material according to claim 6, Features: The surfactant is sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether in a weight ratio of 1:1-4.

8. A method for preparing the low vacuum pipeline concrete dust suppression material according to claim 1, It is characterized in that Here are the steps: S1: dissolving 8% polyvinyl alcohol by mass in hot water and letting it stand; S2: stirring and dispersing the polyacrylate emulsion, and then adding the polyvinyl alcohol solution and mixing and stirring to obtain a mixed solution; S3: Add sodium silicate to the above mixed solution and stir for 5 minutes, dropwise add half the dose of defoamer, then add silica sol and other raw materials and stir rapidly at 1200 rpm for 5 minutes, then mix well and let stand to obtain the finished product.

9. The method for preparing the low vacuum pipeline concrete dust suppression material according to claim 8, Features: The temperature of the hot water in S1 is 90-95°C.

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