CN107955517B - Polyurea-based elastomer material for concrete protection and seepage prevention of hydraulic buildings - Google Patents
Polyurea-based elastomer material for concrete protection and seepage prevention of hydraulic buildings Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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Abstract
The invention provides a polyurea-based elastomer material for concrete protection and seepage prevention of hydraulic buildings and a preparation method thereof. The polyurea-based elastomer material is formed by the reaction of a polyurea-based A component and a polyurea-based B component, wherein the volume ratio of the polyurea-based A component to the polyurea-based B component is 1: 1. The polyurea-based elastomer material has strong binding force with the concrete surface, good elasticity, impact resistance, wear resistance, chemical corrosion resistance, can adapt to moist and low-temperature construction environments and long-term blisters, and high-speed water flow scouring use environments, is coated on the concrete surface of hydraulic buildings (including dams, water delivery tunnels, boxes, culverts, channels and pipelines), and has the characteristics of no softening, no falling, corrosion resistance, impact resistance, wear resistance, freeze thawing resistance, environmental protection and the like.
Description
Technical Field
The invention belongs to the field of hydraulic engineering, relates to an anti-seepage material for a concrete protection and anti-seepage system of a hydraulic building (comprising a dam, a channel, a pipeline, a tunnel, a box culvert and the like), and particularly relates to a polyurea-based elastomer material which is suitable for humidity, low temperature, long-term water immersion resistance, chemical corrosion resistance, impact resistance and wear resistance.
Background
The hydraulic engineering building includes dam, water conveying tunnel, aqueduct, canal, pipeline, etc. and its main body is made of concrete material, and the concrete has the features of rich material, low cost and simple production process, and simultaneously the concrete also has the features of high compression strength, good durability, wide strength grade range, etc. However, in the study of the durability of concrete buildings, it was found that: the defects of construction joint surfaces, structural joint surfaces, concrete surface cracks and the like become main water seepage channels and are key factors influencing the durability of hydraulic buildings. Under the influence of factors such as temperature stress, environment and the like, the parts often become weak links of crack resistance, skid resistance, seepage resistance, freeze injury resistance and chemical corrosion resistance, and are of great importance to the stability, safety and the like of the whole structure. Most of the anti-seepage structures of the traditional hydraulic buildings adopt cement mortar or concrete with good anti-seepage performance, prefabricated anti-seepage structures and the like, the corrosion resistance and the crack resistance of the structures are limited, and particularly, cracks can be generated due to the construction quality, the operation maintenance and the like, so that the anti-seepage function of the structures can be damaged to different degrees. Therefore, the anti-seepage problem of the concrete structure is a very outstanding and urgent problem to be solved. In addition, the problem of the water and electricity engineering construction and operation is that the sand-containing high-speed water flow damages the concrete on the flow surface of the hydraulic building. The high-speed sand-containing water flow forms strong scouring abrasion and cavitation action on the overflow surface of a hydraulic concrete building, is a common disease of hydraulic drainage buildings such as an overflow dam, a flood discharge tunnel (tank), a sluice gate and the like, and is always paid much attention.
In the middle of the 80 s, the chemist Dudley J.Primeaux II was first to develop a successful spray polyurea elastomer (SPUA) technology and first published a research paper in 1989. In 1991 the technology was put to commercial use in the North America. China introduced the GUSMER company equipment and material technology in 1997.
However, the current situation of polyurea in China is uneven, and a lot of problems appear in practice along with the fact that the polyurea material proportion applied in the non-water conservancy and hydropower field enters the water conservancy field. In the field of non-hydraulic hydropower, such as the application of polyurea coatings to stadiums and civil buildings, the time of water-contact scouring is short, and the use of the polyurea coatings does not show much problem. However, in the field of water conservancy and hydropower, the polyurea coating is coated on the protective coating of a concrete hydraulic structure (including a dam, a box culvert, a channel, a pipeline and a tunnel) and is subjected to long-term water bubbles, water flow scouring and the like, so that the polyurea coating is softened, reduced in elasticity and falls off. Fig. 9A to 9D show the situation that the conventional polyurea elastomer is damaged in the existing hydraulic engineering, so that the polyurea coating cannot realize the protection effect on the seepage prevention, impact resistance, wear resistance and chemical corrosion prevention of the concrete hydraulic structure. The analysis shows that the reasons are that the NCO content in the polyurea coating is low, the compactness of the coating is poor, the bonding degree with concrete is low, and meanwhile, in order to reduce the cost, a supplier uses a solvent to further reduce the NCO content in the polyurea coating, so that the polyurea coating is actually a polyurethane coating and can not completely meet the coating requirements of hydraulic buildings in water conservancy and hydropower engineering.
Therefore, the research on the polyurea material used in the field of water conservancy and hydropower is urgently needed, and a novel polyurea material which meets the requirements of wet and low-temperature construction environments of water conservancy projects and service environments such as long-term water immersion resistance, impact resistance, wear resistance, chemical corrosion resistance and the like is provided.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a polyurea-based elastomer material for concrete protection and seepage prevention of hydraulic buildings, which has strong bonding force with hydraulic buildings (including dams, box culverts, channels, pipelines and tunnels), good elasticity, impact resistance, wear resistance, corrosion resistance, can adapt to humid and low-temperature construction environments, long-term water bubbles of hydraulic buildings and use environments of high-speed water flow scouring, does not soften, does not fall off, and is safe and environment-friendly.
Another object of the present invention is to provide a process for the preparation of the above-mentioned polyurea-based elastomeric material.
In order to achieve the above object, the present invention provides a polyurea-based elastomer material for the barrier of hydraulic structures, which is formed by the reaction of a polyurea-based a component and a polyurea-based B component, wherein the volume ratio of the polyurea-based a component to the polyurea-based B component is 1: 1;
the NCO content of the polyureido A component is 16-25%, and the composition is as follows: 100-150 parts of isocyanate, 15-40 parts of tetrahydrofuran polyether, 40-80 parts of propylene oxide polyether and 3-10 parts of super water impregnant;
the polyurea-based B component is: 55-95 parts of amino-terminated polyether, 28-45 parts of amine chain extender, 0.4 part of defoaming agent, 0.3 part of flatting agent, 0.2 part of hydrolysis resistant agent, 5 parts of coloring agent, 0.1 part of antioxidant, 0.2 part of interfacial agent, 0.2 part of ultraviolet absorbent, 0.3 part of liquid rosin glyceride adhesive and 5-15 parts of amino-terminated polybutadiene.
The super-water impregnating compound is synthesized by reacting dopamine and dimethylolpropionic acid according to the weight ratio of 1:1, and is named as SKJ-DA.
The other components are commercial products, such as isocyanate MDI100 and MDI50, tetrahydrofuran polyether PTMG1000 or PTMG2000, propylene oxide polyether PPG1000 or PPG2000, amine terminated polyether D2000 and/or T5000, amine chain extender E100 and/or 6200, defoaming agent BYK530, leveling agent BYK525, anti-hydrolysis agent M200, colorant color paste, antioxidant 1010, interfacial agent KH550, ultraviolet absorbent UV327 and amine terminated polybutadiene SKJ-ATB.
When the isocyanate MDI100 and the MDI50 are mixed for use, the mixture is mixed according to the proportion of 1:1-1: 0.
When the amino-terminated polyether D2000 and the amino-terminated polyether T5000 are mixed for use, the mixture is mixed according to the proportion of 16:1-10: 3.
The amine chain extenders E100, 6200 are mixed in a ratio of 15:4 to 4:3 when used in admixture.
The invention also provides a preparation method of the polyurea-based elastomer material and a preparation method of the polyurea-based A component, which comprise the following steps:
1) mixing tetrahydrofuran polyether and propylene oxide polyether, refining at 100-110 deg.C for 2h to reduce water content to below 0.1%, and cooling to 50 deg.C;
2) adding a super-water impregnating compound, uniformly mixing for 30 minutes, adding isocyanate, and reacting for 10 hours at the temperature of 60-70 ℃;
3) cooling the reaction product to room temperature, discharging and finishing the reaction, N2Packaging and storing;
the preparation method of the component B comprises the following steps:
1) adding an amine chain extender into the amino-terminated polyether, uniformly mixing, refining at the temperature of 100 ℃ and 110 ℃ for 2 hours to reduce the water content to be below 0.1 percent, cooling to room temperature, and discharging to finish the reaction;
2) adding amino-terminated polybutadiene and an auxiliary agent, and dispersing at a high speed, wherein the stirring speed is 700-1000 r/h, the stirring time is 1-2 h, and N is2Packaging and storing;
wherein the auxiliary agent is: defoaming agent, leveling agent, hydrolysis-resistant agent, coloring agent, antioxidant, interfacial agent, ultraviolet absorbent and liquid rosin glyceride adhesive.
The polyurea-based elastomer material provided by the invention has the characteristics of high NCO content and high solid content in the component A, and the polyurea-based elastomer material generated by the reaction of the A, B component has the characteristics of high urea bond and high cohesive energy, so that the elastomer material has the use characteristics of greenness, environmental protection, high strength, high elongation, high durability and low water absorption, and can isolate water molecules and chemical harmful substances in water from invading into concrete through the polyurea-based elastomer material. In addition, the component A is added with the super-water impregnating compound, so that the polyurea-based elastomer material has high adhesive force performance on moist and low-temperature surfaces, and the component B is added with the amino-terminated polybutadiene, so that the polyurea-based elastomer material has low water absorption rate in a long-term water immersion environment.
The invention has the beneficial effects that:
the polyurea-based elastomer material provided by the invention has strong binding force with hydraulic buildings (including dams, box culverts, channels, pipelines and tunnels), good elasticity, impact resistance, wear resistance and chemical corrosion resistance, can adapt to humid and low-temperature construction environments and use environments of long-term water bubbles and high-speed water flow scouring of hydraulic buildings, does not soften, does not fall off, and is safe and environment-friendly. Meanwhile, the coating is also suitable for the anti-seepage coating of the short-age concrete within seven days after the concrete is poured.
Drawings
FIG. 1 is a schematic diagram of a microphase-separated structure of a polyurea-based elastomer material (high urea bond content) provided by the invention.
FIG. 2 is a scanning electron micrograph of the polyurea-based elastomer material (high urea bond content) provided by the present invention, wherein (bright point is soft segment phase and dark field is hard segment phase).
FIG. 3 is a graph of the viscosity of the A component of the polyurea-based elastomer material provided by the present invention as a function of NCO content.
Fig. 4A-4C are schematic views illustrating the seepage prevention of the polyurea-based elastomer material provided by the invention in the water transportation tunnel and the box culvert expansion joint according to the first preferred embodiment of the invention.
Fig. 5A-5C are schematic views of a second preferred embodiment of the polyurea-based elastomeric material provided by the present invention in an impermeable embodiment of an aqueduct.
Fig. 6A-6C are schematic views illustrating an anti-seepage embodiment of a spillway in alpine regions according to a third preferred embodiment of the polyurea-based elastomer material provided by the invention.
Fig. 7A-7C are schematic views illustrating the corrosion prevention and seepage prevention of a fourth preferred embodiment of the polyurea-based elastomer material provided by the invention in a water pipeline and a wharf.
Fig. 8A-8B are schematic views of a fifth preferred embodiment of polyurea-based elastomeric material provided by the present invention in an impermeable embodiment of a weak concrete dam.
Fig. 9A to 9D show the case where the waterproof coating used in the prior art is broken in hydraulic engineering.
Detailed Description
For better understanding of the essence of the present invention, the technical contents of the present invention will be described in detail with reference to examples, but the contents of the present invention are not limited thereto and thus should not be construed as limiting the scope of the present invention.
The bi-component spray polyurea (polyurea-based elastomer material) used in the invention is an elastomer material which is mainly composed of allophanate (urea bond) groups generated by a curing agent component (a polyurea-based A component) and a resin component (a polyurea-based B component) and has a super-water-wetting function. When the polyurea-based component A and the polyurea-based component B react, the polyurea-based material has the characteristics of high reactivity, high curing rate, no VOC, environmental friendliness, firm bonding with a damp interface and the like, and the polyurea material has the advantages of high cohesive energy, high durability and low water absorption due to high urea bond content, and can meet the waterproof and anti-seepage requirements of hydraulic and hydroelectric engineering.
(1) Chemical definition
The prepolymer (A component) with a certain isocyanate content is generated by the reaction of polyol and polyisocyanate, the reaction belongs to polyurethane reaction, and the product contains carbamate (urethane bond: NHCOO);
then, the prepolymer (A component) containing isocyanate reacts with polyamine (B component) to generate a material containing allophanate (urea bond: NHCONH);
the elastomer produced by the reaction has the allophanate (urea bond) content which is more than the urethane (urethane bond) content, and particularly has the urea bond content which is more than 5 times of the urethane bond content.
(2) Definition of hydraulic and hydro-power engineering
The waterproof material has the characteristics of high urea bond content, high cohesive energy, high durability, high solid content, low water absorption, environmental friendliness and the like.
(3) Application performance definition
The waterproof material has the characteristics of rapid curing (curing speed is less than 20 seconds), high construction environment tolerance, high construction efficiency, long-term water soaking resistance, high water pressure resistance and the like, and can meet the waterproof construction requirements and use requirements of water conservancy and hydropower complex interfaces.
The three definitions are defined in the aspects of chemistry, hydraulic and hydroelectric engineering application, construction and application performance respectively.
The following is a polyurea-based elastomer material provided by the present invention, and fig. 1 is a schematic diagram of the microphase separation structure of the polyurea-based elastomer material (with high urea bond content) provided by the present invention. Wherein the rectangular-like structure represents a hard segment (urea bond) of the polyurea elastomer, and the irregular structure represents a soft segment of the polyurea elastomer. FIG. 2 shows a SEM image, in which (bright spots are soft segments and dark fields are hard segments).
The polyurea-based composite material is prepared by the reaction of a polyurea-based A component and a polyurea-based B component, wherein the volume ratio of the polyurea-based A component to the polyurea-based B component is 1:1, and the specific components are shown in Table 1:
TABLE 1
The physical properties of the above-mentioned polyurea-based elastomeric material are shown in Table 2:
TABLE 2
The preparation method of the polyurea-based component A comprises the following steps:
1) mixing tetrahydrofuran polyether PTMG1000 and propylene oxide polyether PPG1000, refining at 105 deg.C for 2 hr to reduce water content to below 0.1%, and cooling to 50 deg.C;
2) adding an ultra-water impregnating compound SKJ-DA, uniformly mixing for 30 minutes, adding isocyanate MDI100, and reacting for 10 hours at 65 ℃;
3) cooling the reaction product to room temperature, discharging and finishing the reaction, N2And (5) packaging and storing.
The preparation method of the component B comprises the following steps:
1) evenly mixing the amino-terminated polyether D2000 and the amino-terminated polyether T5000, then adding the amine chain extender E100 into the amino-terminated polyether, refining for 2 hours at 110 ℃ to reduce the water content to be below 0.1 percent, cooling to room temperature, and discharging to finish the reaction;
2) adding amino polybutadiene SKJ-ATB and assistant, and high-speed dispersing at 900 rpm for 1.5 hr while adding N2Packaging and storing;
wherein the auxiliary agent is: a mixture of a defoaming agent BYK530, a flatting agent BYK525, an anti-hydrolysis agent M200, a coloring color paste, an antioxidant 1010, an interfacial agent KH550, an ultraviolet absorbent UV327 and a liquid rosin glyceride adhesive.
FIG. 3 is a relationship between the viscosity of the polyurea-based A component and the NCO content, and due to the extremely fast reaction speed of the polyurea-based elastomer material, the construction thereof is limited to the use of a two-component collision mixing airless spraying device (polyurea spraying machine XP3), wherein the limitation on the viscosity of the polyurea-based A component is particularly strict, and the only way to solve the problem is to increase the NCO content of the polyurea-based A component. The improvement of NCO content not only can reduce the viscosity of the system, but also can keep high solid content and high reactivity, simultaneously, the cohesive force of the material is larger, the hydrolysis resistance is better, the reaction speed is faster, and the construction environment requirement of hydraulic engineering is more suitable.
TABLE 3
| NCO content/%) | Urea bond/. times.1020/g | Urethane bond/. times.1020/g |
| 6 | 4.01 | 4.01 |
| 8 | 6.02 | 3.61 |
| 10 | 7.07 | 3.40 |
| 12 | 8.66 | 3.08 |
| 15 | 10.70 | 2.68 |
| 17 | 12.22 | 2.37 |
| 20 | 14.05 | 2.01 |
The corresponding relationship between the NCO content and the content of the urea bond and the urethane bond is shown in the above table 3, and in order to ensure high urea bond content, the NCO content in the polyurea-A component is controlled to be 16-25%, so that the content of the urea bond and the urethane bond is maintained to be more than 5: 1. When the NCO content is low, the prepolymer has high molecular weight and low reactivity, the spraying construction is greatly influenced by the environment, the strength and cohesive energy of the material are low, and the durability is poor, such as the NCO content in the existing polyurea coating is 8-13%. When the NCO content is higher, the prepolymer has low molecular weight and high reactivity, the spraying construction is less influenced by moist and low-temperature environments, and the sprayed polyurea elastomer has better strength and hardness and higher cohesive energy.
As shown in Table 3, the NCO content is preferably more than 16% in water conservancy and hydropower engineering, 18% in the formula, the strong cohesive force and the tight molecular arrangement block the way of water immersion in the material, and in addition, the material contains the super water wetting agent and the amino-terminated polybutadiene, so that the wet interface adhesive force and the long-term water-soaking durability of an elastomer coating can be improved, and the good water environment use stability is provided for hydraulic buildings.
The NCO content of the polyurea-based A component is related to the mechanical properties of the polyurea material as shown in Table 4:
TABLE 4
The higher the content of the urea bond is, the more excellent the mechanical property, the better the durability and the higher the hardness of the spray polyurea elastomer areHigh, better chemical resistance. This is caused by the strength of the urea hydrogen bonds being higher than the strength of the urethane hydrogen bonds. The graphs (a) and (b) are structural schematic diagrams of urea hydrogen bond and urethane hydrogen bond, and it can be seen that the urea carbonyl group can simultaneously form hydrogen bond with two N-H on another urea bond, while the urethane carbonyl group can only form hydrogen bond with one N-H, and the length of the urea hydrogen bond
Hydrogen bond length to urethane
Short.
When in use, a spraying machine is used for spraying the polyurea-based component A and the polyurea-based component B according to the volume ratio of 1:1, and the total dosage is 3.5-6.0 kg/m2And curing for 8-15 s to form a seamless coating. The cured polyurea-based elastomer coating film has tensile strength of more than 2080N/cm2And the coating with the elongation rate of more than 350 percent (usually in the occasion of 20 ℃) has good strength and elasticity, and the thickness of the coating can reach 2-6 mm, so that the coating is an excellent anti-seepage, anti-corrosion, anti-freezing, anti-impact and wear-resistant elastomer material.
The prior barrier material needs to be coated with a primer coating, such as an epoxy primer coating or a polyurethane primer coating, between the concrete and the polyurea coating, in the embodiment of the present application, the above coating method is adopted, and the primer coating adopts an epoxy primer, an epoxy primer + a polyurethane primer, or a polyurethane primer coating.
Example 1
In the seepage-proofing embodiment of the polyurea-based elastomer material applied to the water-conveying tunnel and the box culvert expansion joint, the water-conveying tunnel needs to be used in a long-term water-soaking environment, and the surface of the base material belongs to a damp and low-temperature base surface during construction, so that the polyurea-based material applied to the field meets the use requirements, namely has the characteristics of high elongation, environmental protection, high NCO content, high urea bond, high solid content, low water absorption and super water soaking.
Wherein, as shown by the arrow, the expansion joint between the water transportation tunnel (as shown in fig. 4A) and the box culvert (as shown in fig. 4B) is coated with the polyurea-based elastomer material provided by the embodiment.
Fig. 4C is a schematic diagram of the construction of the polyurea-based barrier elastomer material of this embodiment, and it can be seen that the polyurea-based barrier elastomer material spans the joint between two concrete structures and extends to about 30 cm each.
Example 2
In the embodiment of the invention, the diversion canal needs to be soaked in water for a long time, exposed to sunlight for a long time and repeatedly alternate between water and no water, so the polyurea-based elastomer material used in the application field meets the use requirements, namely has the characteristics of high NCO content, high urea bond, high solid content, scouring resistance, low water absorption and super water soaking.
Wherein the surfaces of the water diversion channel (shown in figure 5A) and the aqueduct (shown in figure 5B) are sprayed with the polyurea-based elastomer material provided by the embodiment.
Fig. 5C is a schematic structural view of the polyurea-based impermeable elastomer material in this embodiment, and it can be seen from the figure that the polyurea-based elastomer material is sprayed on all the water-passing inner surfaces of the water diversion channel.
By combining the above embodiments 1 and 2, the existing protective and anti-seepage material laid on the water transportation tunnel, box culvert and water diversion channel contains catalyst, is easy to hydrolyze, can generate water seepage condition in three months of soaking, can be highly water-absorbing and softened, fall off and damage, and is seriously hydrolyzed when being soaked and scoured for more than half a year, and seriously affects the use of the water transportation tunnel and water diversion channel, so that the waterproof material has to be coated again, and the construction cost is increased. The polyurea-based elastomer material provided by the embodiment has the advantages of high urea bond content, high cohesive energy, environmental protection, high elongation, high strength, low water absorption and long-term water immersion and scouring resistance, shows good waterproof and anti-seepage performance, and can run for more than 30 years through a laboratory aging resistance promotion test.
Example 3
The polyurea-based elastomer material provided by the invention is applied to the seepage-proofing, impact-resisting and wear-resisting embodiment of the spillway in the alpine region (as shown in figure 6A), the spillway in the alpine region operates below-20 ℃ in winter and is subjected to the scouring of high-speed water flow (20-40 m/s), and the polyurea-based elastomer material applied to the field needs to meet the performances of freeze-thaw resistance, impact resistance and wear resistance and has the characteristics of high urea bond content, high cohesive energy, high elongation, high strength, low water absorption, high-speed water flow scouring resistance, impact resistance and wear resistance. In use, the polyurea-based elastomer material provided by the embodiment is sprayed on the surface of the spillway (as shown in fig. 6A).
Fig. 6B and 6C are schematic structural diagrams illustrating the use of the polyurea-based impermeable, impact-resistant, abrasion-resistant, freeze-thaw resistant elastomeric material in this example.
The existing protective anti-seepage material laid on the spillway in the alpine region has poor wear resistance, shear resistance, impact resistance and freeze-thaw resistance, so that the problems of coating damage, falling and stripping can occur after high-speed water flow scouring and freeze thawing, the use of the spillway is influenced, and the anti-impact and wear-resistant material has to be coated again, so that the construction cost is increased and the use is delayed.
Example 4
The polyurea-based elastomer material provided by the invention is applied to the protection, corrosion prevention and salt damage prevention of water pipelines (as shown in figure 7A) and wharf water retaining structures (as shown in figure 7B). The polyurea-based elastomer material applied to the field meets the use requirements of the environment when the water in the water pipeline contains corrosive chemical substances and the seawater of a wharf contains a large amount of salinization substances, and has the characteristics of high urea bond content, high cohesive energy, high elongation, high strength, low water absorption rate and resistance to corrosion of salinization substances and harmful chemical substances. The polyurea-based elastomer material is sprayed in a pipeline and on a wharf water retaining structure when in use.
FIG. 7C is a schematic structural diagram of the polyurea-based barrier and corrosion-resistant polyurea-based elastomer material used in the present embodiment.
Example 5
The polyurea-based elastomer material provided by the invention is applied to the embodiment of short-age concrete within seven days after the dam (as shown in figure 8A) is poured. As the weak concrete contains moisture and the concrete interface belongs to a wet interface, the polyurea-based elastomer material used in the field meets the use requirements of the environment, and has the characteristics of high NCO content, high urea bond, high solid content, low water absorption, curing on the wet interface and high bonding strength. The polyurea-based elastomer material is sprayed on the surface of weak concrete of a dam in use.
Fig. 8B is a schematic structural diagram of the polyurea-based barrier elastomer material in this example.
As can be seen from the above examples, the polyurea-based elastomer material provided by the invention has high NCO content, good strength and hardness and higher cohesive energy. The waterproof paint has strong binding force with the surface of a hydraulic structure (comprising a dam, a box culvert, a channel, a pipeline and a tunnel), good elasticity, impact resistance, wear resistance and chemical corrosion resistance, can ensure that the hydraulic structure does not soften and fall off in the environment of low-temperature long-term water soaking and high-speed water flow scouring, is safe, environment-friendly and corrosion-resistant, and improves the durability of the hydraulic structure.
Claims (1)
1. The polyurea-based elastomer material for concrete protection and seepage prevention of hydraulic structures is characterized by being generated by the reaction of a polyurea-based A component and a polyurea-based B component, wherein the volume ratio of the polyurea-based A component to the polyurea-based B component is 1: 1;
the NCO content of the polyureido A component is 16-25%, and the composition is as follows: 100-150 parts of isocyanate, 15-40 parts of tetrahydrofuran polyether, 40-80 parts of propylene oxide polyether and 3-10 parts of super water impregnant;
the polyurea-based B component is: 55-95 parts of amino-terminated polyether, 28-45 parts of amine chain extender, 0.4 part of defoaming agent, 0.3 part of flatting agent, 0.2 part of hydrolysis resistant agent, 5 parts of coloring agent, 0.1 part of antioxidant, 0.2 part of interfacial agent, 0.2 part of ultraviolet absorbent, 0.3 part of liquid rosin glyceride adhesive and 5-15 parts of amino-terminated polybutadiene,
the super-water impregnating compound is synthesized by reacting dopamine and dimethylolpropionic acid according to the weight ratio of 1: 1;
the preparation method of the polyurea-based elastomer material and the preparation method of the polyurea-based A component comprise the following steps:
1) mixing tetrahydrofuran polyether and propylene oxide polyether, refining at 100-110 deg.C for 2h to reduce water content to below 0.1%, and cooling to 50 deg.C;
2) adding a super-water impregnating compound, uniformly mixing for 30 minutes, adding isocyanate, and reacting for 10 hours at the temperature of 60-70 ℃;
3) cooling the reaction product to room temperature, discharging and finishing the reaction, N2Packaging and storing;
the preparation method of the component B comprises the following steps:
1) adding an amine chain extender into the amino-terminated polyether, uniformly mixing, refining at the temperature of 100 ℃ and 110 ℃ for 2 hours to reduce the water content to be below 0.1 percent, cooling to room temperature, and discharging to finish the reaction;
2) adding amino-terminated polybutadiene and an auxiliary agent, and dispersing at a high speed, wherein the stirring speed is 700-1000 r/h, the stirring time is 1-2 h, and N is2Packaging and storing;
wherein the auxiliary agent is: defoaming agent, leveling agent, hydrolysis-resistant agent, coloring agent, antioxidant, interfacial agent, ultraviolet absorbent and liquid rosin glyceride adhesive.
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