Polymer composite hydrophobic enhanced waterproof bonding layer for bridge deck and preparation method of polymer composite hydrophobic enhanced waterproof bonding layer

Abstract

The invention discloses a polymer composite hydrophobic enhanced bridge deck waterproof bonding layer and a preparation method thereof, and relates to the technical field of road engineering. The invention solves the problem of how to develop a high-performance and environment-friendly bridge deck waterproof bonding layer material. The coating is prepared from coating slurry, and the coating slurry is prepared from the following raw materials in parts by mass: 400-600 parts of epoxy resin; 100 to 150 parts of an epoxy resin curing agent; 400 to 600 parts of polyurethane; 5 to 10 parts of gas-phase nano silicon dioxide; 7 to 15 parts of fluorosilicone polymer; and 6-10 parts of polypropylene fiber. The adhesive provided by the invention has relatively strong cohesiveness and waterproofness, and can provide enough cohesiveness and waterproofness when being applied between a concrete bridge deck and a pavement layer, so that the durability of the bridge deck pavement layer is guaranteed, and the service life of a bridge pavement structure is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering, and particularly relates to a polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks and a preparation method thereof. Background Art

[0002] As an important part of highway bridges, the durability of concrete bridges has a direct impact on the operation efficiency and safety of the highway network. With the continuous development of highway transportation and the gradual increase in the number of bridges in China, bridge deck paving has become an indispensable part of the bridge traffic system. Especially the waterproof bonding layer between the asphalt pavement and the cement concrete bridge deck plays a key role in preventing rainwater from penetrating the bridge deck and improving the stress situation between the two structures. The waterproof bonding layer has two main functions in the bridge deck paving system: one is to prevent moisture from penetrating into the concrete bridge deck; the other is to provide sufficient bonding force for the upper paving layer so that it can withstand traffic loads. The connection performance between the waterproof bonding layer and the bridge deck and the asphalt paving layer has an important impact on the safety and durability of the bridge. Weak connection performance may lead to slippage and uplift of the bridge deck. Therefore, improving the performance of the bridge deck waterproof bonding layer has become an important research direction for ensuring the safety and durability of bridges.

[0003] The currently applied waterproof bonding layer for actual bridge deck paving has the following disadvantages and deficiencies: limited waterproof performance, vulnerable to water damage, resulting in substrate corrosion and structural damage; the bonding performance is significantly affected by temperature changes, prone to flowing under high temperature conditions and brittle cracking under low temperature conditions, thus causing peeling and shear failures; insufficient anti-aging performance, easily degraded when exposed to oxygen and moisture for a long time, with a limited service life; complex construction process, having a negative impact on the environment, including the emission of volatile organic compounds. To solve the deficiencies in the current waterproof performance research, the waterproof bonding layer needs to have high waterproof performance, bonding strength, high temperature stability and low temperature crack resistance. Based on the above factors, it is particularly necessary to study a high-performance composite modified waterproof bonding material with excellent mechanical properties and flexibility. The new waterproof bonding material should have more excellent waterproof performance, stronger bonding property and durability, and at the same time minimize the emission of volatile organic compounds during construction, meeting the requirements of modern bridge construction for high-performance and environmentally friendly materials. In summary, developing high-performance and environmentally friendly waterproof bonding layer materials is of great significance for improving the durability and safety of bridge structures. Summary of the Invention

[0004] Aiming at the problem of how to develop high-performance and environmentally friendly waterproof bonding layer materials in the prior art, the present invention provides a polymer composite hydrophobic enhanced bridge deck waterproof bonding layer and its preparation method. The aim is to use two polymer materials as matrix materials through compounding, and carry out hydrophobic modification and fiber reinforcement, so that the bridge deck has excellent waterproof performance and bonding performance. One is to make the bridge deck have stable waterproof performance under long-term immersion and water pressure, mainly including hydrophobic performance and water impermeability performance; the other is to ensure the bonding performance between the asphalt mixture bridge deck paving layer and the concrete bridge deck under different working conditions, mainly including the anti-fatigue performance, freeze-thaw resistance performance, and immersion strength of the waterproof bonding material. In addition, to use the superhydrophobic coating material for the concrete bridge deck, its temperature change resistance, low temperature flexibility, corrosion resistance, frost resistance, tensile strength, and elongation at break must be ensured. In addition, to make it widely used in practical projects, it must also ensure that it has the characteristics of economy, high efficiency, environmental protection, and easy construction.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A polymer composite hydrophobic enhanced bridge deck waterproof bonding layer is prepared from a coating slurry. The preparation raw materials of the coating slurry are in parts by mass and include:

[0007] Epoxy resin: 400 - 600 parts;

[0008] Epoxy resin curing agent: 100 - 150 parts;

[0009] Polyurethane: 400 - 600 parts;

[0010] Vapor-phase nano-silica: 5 - 10 parts;

[0011] Fluorosilicon polymer: 7 - 15 parts;

[0012] Polypropylene fiber: 6 - 10 parts.

[0013] After adopting this technical solution, the bridge deck waterproof bonding layer of the present invention is prepared from a coating matrix material, a hydrophobic modification material, and a fiber reinforcement material. Using the present invention as the bonding matrix material between the concrete bridge deck and the bridge deck asphalt mixture paving layer ensures the bonding property and denseness of the waterproof bonding layer. The hydrophobic modification material greatly enhances the hydrophobic performance of the waterproof bonding layer, enabling it to play a stable waterproof bonding role under long-term immersion. The hydrophobicity avoids the performance deterioration that may be caused by long-term immersion. By incorporating the fiber reinforcement material, the bonding strength and failure mode of the waterproof bonding layer are improved, further enhancing its bonding performance between the bridge deck and the paving layer.

[0014] Epoxy resin has excellent mechanical strength, chemical corrosion resistance, and good bonding properties. It can be cured at room temperature, and the cured material has high hardness and durability. Therefore, it is used as one of the base materials of the bridge deck waterproof bonding layer. Polyurethane has good elasticity, wear resistance, chemical corrosion resistance, and weather resistance. In terms of its application in the waterproof bonding layer, polyurethane can effectively adapt to the minor deformation of the base material and prevent water penetration to form a solid waterproof barrier due to its excellent elasticity and durability. In addition, polyurethane bonding materials have good bonding strength and anti-aging properties and can maintain stable performance under harsh environmental conditions. It is considered to be compounded with epoxy resin to form the matrix material of the waterproof bonding layer. After mixing the two, the advantages of both can be combined to form a composite material with excellent comprehensive properties. The blended material not only has the high strength, excellent bonding properties, and chemical corrosion resistance of epoxy resin but also can improve the flexibility and durability of the overall material by virtue of the high elasticity, wear resistance, and impact resistance of polyurethane, thereby providing better fatigue resistance and long service life in structural applications. Therefore, this invention selects polyurethane and epoxy resin as the matrix materials of the new waterproof bonding layer.

[0015] Hydrophobic properties are of great significance in enhancing the waterproof function of materials. Materials with hydrophobic properties reduce the surface energy, prompting water droplets to form a larger contact angle on their surface, thereby reducing the adhesion of water to the material surface. This characteristic effectively prevents water molecules from penetrating into the material interior, thus improving the waterproof performance of the material. By reducing water penetration, hydrophobic materials can prevent problems such as material corrosion, swelling, and mildew caused by water intrusion and extend the service life of the material. Fluorosilicon polymers with a lower surface energy are selected as low-surface-energy modifiers to hydrophobically modify the base material. Constructing a complex micro-nano-scale microscopic morphology on the surface of low-surface-energy substances can better improve the hydrophobic properties of coating materials. Nano-silica is widely used in the industrial field due to its good high-temperature resistance and non-decomposability. Adding it to the resin can improve the organic polymer film-forming property and transparency of the resin while having the advantages of solvent resistance, high hardness, and wear resistance. Considering various aspects such as practicality, environmental protection, and economy, nano-silica is selected as the inorganic filler for the bridge deck waterproof bonding coating.

[0016] The advantages of polypropylene fibers include excellent tensile strength and wear resistance, light weight and low density, good chemical stability, and resistance to most chemicals. In addition, polypropylene fibers have excellent water resistance, are not easily hygroscopic, and can maintain stable performance in a humid environment. Using polypropylene fibers in the waterproof bonding layer has significant advantages. First, polypropylene fibers can enhance the crack resistance of the bonding layer and prevent the propagation of microcracks caused by temperature changes and loads. Second, its water resistance and chemical stability enable it to maintain good waterproof effects in a humid environment for a long time.

[0017] Under this proportion, the material properties of epoxy resin and polyurethane can be effectively combined, enabling it to significantly increase the deformation performance of the material without significantly reducing the bonding performance of the epoxy resin. The incorporation of fumed nano-silica and fluorosilicone polymer will play a role in the hydrophobic property, but insufficient or excessive dosage will affect the viscosity of the matrix material and its bonding and waterproof performance after curing. Therefore, after the coating slurry under this proportion cures, the waterproof bonding layer surface has a low surface energy and a significantly increased contact angle due to the micro-rough structure, thus greatly improving its hydrophobic property and further enhancing the waterproof performance without significantly changing the inherent bonding and deformation characteristics of the matrix material itself. The incorporation of polypropylene fibers will change the failure model of the waterproof bonding layer and significantly enhance its bonding performance, but too little dosage is difficult to play a role, and too much dosage will cause waste and affect the viscosity of the waterproof bonding slurry, increasing its construction difficulty. Therefore, after the coating slurry under this proportion cures, the failure mode of the waterproof bonding layer changes from cohesive failure to interfacial failure, greatly improving the bonding strength of the waterproof bonding layer itself.

[0018] Preferably, the mass ratio of the epoxy resin to the epoxy resin curing agent is 1:4, the mass ratio of the epoxy resin to the polyurethane is 1:1, the dosage of the fluorosilicone polymer is 11% of the total mass of the polyurethane and epoxy resin blend, the dosage of the fumed nano-silica is 0.7% of the total mass of the polyurethane and epoxy resin blend, and the dosage of the polypropylene fiber is 0.8% of the total mass of the polyurethane and epoxy resin blend.

[0019] After adopting this technical solution, the proportion relationship between the epoxy resin and its curing agent is 4:1, and this proportion ensures that the curing agent and the epoxy resin can react completely to form a three-dimensional cross-linked network, improving the mechanical strength and chemical stability of the material.

[0020] The proportion relationship between the epoxy resin and the polyurethane is 1:1, which is the optimal proportion obtained through mechanical tests. Under this proportion, the cured epoxy resin and polyurethane composite matrix material obtains the maximum pull-out adhesion force. When higher than this proportion, the failure form of the pull-out test will change from cohesive failure to interfacial failure, resulting in a decrease in the pull-out adhesion force. When lower than this proportion, due to the large proportion of polyurethane, the overall pull-out adhesion force strength will also decrease. Considering the test results comprehensively, a 1:1 mixing ratio is selected.

[0021] The mixing ratios of fluorosilicone polymer, fumed nano-silica, and polypropylene fiber are obtained by the central composite design-response surface methodology. During the design of the mixing ratios, the contact angle and pull-off adhesion are used as evaluation indicators. Both are standardized with the larger-the-better characteristic. Then, a weight of 0.7 is multiplied by the adhesion, and a weight of 0.3 is multiplied by the contact angle. The final score obtained is used as the response surface design index. Using the data obtained from the response surface design, with the comprehensive score value as the response variable y, the dosage of polypropylene fiber (x 1 ), the dosage of silica (x 2 ), and the dosage of fluorosilicone polymer (x 3 ) as the three independent variables, considering the number of independent variables, the non-linear relationship and interaction between independent variables, and the complexity of the response surface model, multivariate non-linear regression analysis is carried out using Matlab software, and a quadratic polynomial is used to establish a response surface model of the comprehensive score value, and finally the optimal mixing ratios of fluorosilicone polymer, fumed nano-silica, and polypropylene fiber are obtained.

[0022] Preferably, the polyurethane is one or more of AH-K100, PUR-S5718, and TG9853.

[0023] After adopting this technical solution, this type of polyurethane all has strong elasticity and flexibility. Combining such materials with epoxy resin having higher hardness and strength will obtain a matrix material with better comprehensive properties (flexibility, elasticity, bonding strength, etc.).

[0024] Preferably, the fluorosilicone polymer is one or more of PF-302, PF-311, and PF-316.

[0025] After adopting this technical solution, these fluorosilicone polymers themselves have a relatively high contact angle, so they are preferably used as hydrophobic modifiers. Secondly, their own application fields are building products such as concrete, stone, and bricks, which are more in line with the application field of the bridge deck waterproof bonding layer. Finally, the organic solvents used in these fluorosilicone polymers have good compatibility with polyurethane and epoxy resin, so that they will not be difficult to be compatible and stratified during physical blending.

[0026] Preferably, the particle size of the fumed nano-silica is 7-40 nm.

[0027] Preferably, the epoxy resin is one or more of E51, E44, and E20.

[0028] After adopting this technical solution, this type of epoxy resin has good mechanical properties, excellent bonding strength, and high chemical resistance, which is more suitable for the service environment of the bridge deck waterproof bonding layer. Therefore, this type of material is selected as the matrix material of the waterproof bonding layer.

[0029] A preparation method of a polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks, including the preparation of a coating slurry, and then spreading the coating slurry on the bridge deck to form a waterproof bonding layer. The preparation method of the coating slurry is as follows:

[0030] Step A: Mix epoxy resin and an epoxy resin curing agent according to a ratio to obtain an epoxy resin matrix material;

[0031] Step B: Add polyurethane to the epoxy resin matrix material according to a ratio to obtain a waterproof bonding matrix material;

[0032] Step C: Mix gas-phase nano-silica powder and a fluorosilicone polymer according to a ratio to obtain a solid-liquid sol-state dispersion system;

[0033] Step D: Add the solid-liquid sol-state dispersion system prepared in Step C to the waterproof bonding matrix material obtained in Step B to obtain a hydrophobic enhanced waterproof bonding matrix material;

[0034] Step E: Add polypropylene fibers to the hydrophobic enhanced waterproof bonding matrix material obtained in Step D according to a ratio to obtain a coating slurry.

[0035] Preferably, the spreading amount of the coating slurry is 2.25 - 3 kg / m 2 .

[0036] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0037] (1) This new type of polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks has strong adhesiveness and waterproofness. Applying it between the concrete bridge deck and the paving layer can provide sufficient adhesiveness and waterproof performance, thus ensuring the durability of the bridge deck paving layer and extending the service life of the bridge paving structure.

[0038] (2) This new type of polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks uses a fluorosilicone polymer and gas-phase nano-silica as surface energy modifiers. By reducing the surface energy of the coating, this coating has excellent waterproof performance and can still maintain stable waterproof performance under long-term immersion environments.

[0039] (3) This new type of polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks uses polypropylene fibers as fiber reinforcing materials. Through the reinforcing and toughening effects of the polypropylene fibers, the actual failure mode of the bonding layer is changed, and the failure mode changes from cohesive failure to interfacial failure, greatly enhancing the bonding strength of the waterproof bonding layer itself.

[0040] (4) The preparation method of this new type of polymer composite hydrophobic enhanced waterproof bonding layer for bridge decks is relatively simple and the curing time is short, which is suitable for actual construction use.

[0041] (5) This new polymer composite hydrophobic enhanced bridge deck waterproof bonding layer has strong performance advantages in complex service environments. In addition to the basic waterproof bonding performance, it also has strong temperature change resistance, low temperature flexibility, corrosion resistance, frost resistance, tensile strength, and elongation at break, etc., which provides durability performance guarantee for it in complex service environments and extends the service life cycle. Description of the Drawings

[0042] Figure 1 is the preparation flow chart of the present invention;

[0043] Figure 2 is the test result of the water impermeability performance of the waterproof bonding layer in Example 1 of the present invention. Detailed Embodiments

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0045] Example 1

[0046] A polymer composite hydrophobic enhanced bridge deck waterproof bonding layer is prepared from a coating slurry. The preparation raw materials of the coating slurry are in parts by mass and include: Epoxy resin E51: 500 parts; Epoxy resin curing agent T31: 125 parts; AH-K100 polyurethane: 500 parts; Gas-phase nano-silica (particle size 7 - 40 nm, nano-spherical particles, amorphous or non-crystalline structure): 7 parts; PF-302 fluorosilicon polymer: 11 parts; Polypropylene fiber: 8 parts.

[0047] The specific parameters of the polypropylene fiber used are shown in Table 1:

[0048] Table 1 Main technical parameters of polypropylene fiber

[0049] Item Measured result Item Measured result Fiber type Bundle of monofilaments Tensile strength > 486 MPa Specific gravity 0.91 Elastic modulus > 4.8 GPa Acid and alkali resistance High Fiber diameter 18 - 48 μm Thermal conductivity Low Water absorption None Low temperature resistance Strong Tensile limit ＞15％

[0050] As Figure 1 shown, the preparation method of the coating slurry is as follows:

[0051] Step 1: Mix 500 parts of epoxy resin with 125 parts of epoxy resin curing agent, and use a magnetic stirrer to fully stir at a rate of 1500 r / min for 5 min to uniformly mix the epoxy resin and the epoxy resin curing agent, obtaining an epoxy resin matrix material;

[0052] Step 2: Add 500 parts of polyurethane to the epoxy matrix material obtained in Step 1, and use a magnetic stirrer to stir thoroughly at a rate of 2000 r / min for 5 min to obtain the matrix material of the waterproof bonding layer;

[0053] Step 3: Mix 7 parts of gas-phase nano-silica powder and 11 parts of fluorosilicone polymer, and use ultrasonic dispersion to uniformly disperse the gas-phase nano-silica powder in the fluorosilicone polymer to obtain a solid-liquid sol-state dispersion system;

[0054] Step 4: Add the solid-liquid sol-state dispersion system obtained in Step 3 to the matrix material of the waterproof bonding layer obtained in Step 2, and use a magnetic stirrer to stir thoroughly again at a rate of 2000 r / min for 8 min to obtain a hydrophobic enhanced waterproof bonding matrix material;

[0055] Step 5: Add 8 parts of polypropylene fiber to the hydrophobic enhanced waterproof bonding matrix material obtained in Step 4, and stir thoroughly again to fully mix the component materials, and finally obtain a novel polymer composite hydrophobic enhanced bridge deck waterproof bonding coating slurry.

[0056] To explore the specific influence of the spreading amount on the physical and mechanical properties of the waterproof bonding layer, the present invention selects spreading amounts of 1.50 kg / m 2 、1.87 kg / m 2 、2.25 kg / m 2 、2.62 kg / m 2 and 3.00 kg / m 2 for testing. Under room temperature conditions, the bonding performance under different spreading amounts was tested through a 45° inclined shear test (the 45° inclined shear strength of the composite material specimen was tested by using a Universal Testing Machine (UTM). The test temperature was 28 °C and the loading speed was 50 mm / min. The termination condition for the inclined shear strength test was that the shear stress reached the maximum value or the relative interlayer displacement exceeded 20 mm). The inclined shear strengths of the composite specimens under different spreading amounts are shown in Table 2:

[0057] Table 2 Peak shear force and strength corresponding to different spreading amounts of the waterproof bonding layer

[0058]

[0059] To explore the waterproof performance of the waterproof bonding layer under pressure with different spreading amounts, the present invention selects spreading amounts of 0 kg / m 2 、0.5 kg / m 2 、1.0 kg / m 2 and 1.5 kg / m 2The spraying amount. Under room temperature conditions, a pressure water penetration device was used to test the waterproof performance of the waterproof bonding layer at different spraying amounts. The pressure difference and water level difference curves of specimens with different spraying amounts are as Figure 2 shown. Figure 2 It shows that under the spraying amount condition of 1.5 kg / m 2 , as the pressure increases from 0 to 0.3 MPa, the height difference of the water surface remains unchanged all the time. This indicates that when the spraying amount is greater than 1.5 kg / m 2 , water penetration will not occur under a pressure difference of 0.3 MPa, while when the spraying amount is less than 1.5 kg / m 2 , water penetration will occur. Therefore, to meet the waterproof performance requirements, the spraying amount needs to be greater than 1.5 kg / m 2 ; Table 2 shows that the greater the spraying amount of the waterproof bonding layer, the gradually increasing adhesion strength. When the spraying amount increases from 1.5 kg / m 2 to 2.25 kg / m 2 , the annual strength growth rate is relatively obvious, while when it increases from 2.25 kg / m 2 to 3.00 kg / m 2 , its adhesion strength growth rate and growth amplitude significantly tend to be flat. Considering the waterproof performance and bonding strength of the waterproof bonding layer, and taking into account its economy, 2.25 kg / m 2 is finally selected as the optimal spraying amount of the waterproof bonding layer.

[0060] Spray the polymer composite waterproof bonding material according to the spraying amount of 2.25 kg / m 2 , and a new type of polymer composite hydrophobic enhanced bridge deck waterproof bonding layer can be formed after it is cured. For the finally prepared new type of polymer composite hydrophobic enhanced bridge deck waterproof bonding layer in this embodiment, an apparent contact angle measuring instrument is used to measure the apparent contact angle of the material surface, and a waterproof test is used to measure its water impermeability. The bonding performance under different working conditions is measured through a shear test, mainly including the anti-fatigue performance, freeze-thaw resistance performance, immersion strength, etc. of the material. In addition, various tests are used to test the temperature change resistance performance, low temperature flexibility, corrosion resistance, frost resistance, tensile strength and elongation at break of the material. The technical indicators of the new type of polymer composite hydrophobic enhanced bridge deck waterproof bonding layer measured are shown in Table 3.

[0061] Table 3

[0062]

[0063]

[0064] Example 2

[0065] A polymer composite hydrophobic enhanced bridge deck waterproof bonding layer is prepared from a coating slurry. The preparation raw materials of the coating slurry are as follows in parts by mass: Epoxy resin E51: 400 parts; Epoxy resin curing agent T31: 100 parts; Polyurethane AHK100: 600 parts; Fumed nano-silica: 7 parts; Fluorosilicon polymer PF-302: 11 parts; Polypropylene fiber: 8 parts.

[0066] The preparation method of the coating slurry is as follows:

[0067] Step 1: Mix 400 parts of epoxy resin with 100 parts of epoxy resin curing agent, and use a magnetic stirrer to fully stir at a rate of 1500 r / min for 5 min to uniformly mix the epoxy resin and the epoxy resin curing agent, obtaining an epoxy resin matrix material;

[0068] Step 2: Add 600 parts of polyurethane to the epoxy matrix material obtained in Step 1, and use a magnetic stirrer to fully stir at a rate of 2000 r / min for 5 min, obtaining the matrix material of the waterproof bonding layer;

[0069] Step 3: Mix 7 parts of fumed nano-silica powder and 11 parts of fluorosilicon polymer, and use ultrasonic dispersion to uniformly disperse the fumed nano-silica powder in the fluorosilicon polymer, obtaining a solid-liquid sol dispersion system;

[0070] Step 4: Add the solid-liquid sol dispersion system obtained in Step 3 to the waterproof bonding layer matrix material obtained in Step 2, and again use a magnetic stirrer to fully stir at a rate of 2000 r / min for 8 min, obtaining a hydrophobic enhanced waterproof bonding matrix material;

[0071] Step 5: Add 8 parts of polypropylene fiber to the hydrophobic enhanced waterproof bonding matrix material obtained in Step 4, and stir fully again to fully mix all component materials, finally obtaining a novel polymer composite hydrophobic enhanced bridge deck waterproof bonding coating slurry. The optimal spreading amount of this polymer composite waterproof bonding material is 2.25 kg / m 2 , and after it cures, a novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer can be formed.

[0072] For the novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer finally prepared in this embodiment, an apparent contact angle of the material surface is measured by a contact angle measuring instrument, and its water impermeability is measured by a waterproof test. Its bonding performance under different working conditions is measured by a shear test, mainly including the anti-fatigue performance, freeze-thaw resistance performance, immersion strength, etc. of the material. In addition, various tests are used to test the temperature change resistance performance, low temperature flexibility, corrosion resistance, frost resistance, tensile strength and elongation at break of the material. The technical indexes of the novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer are shown in Table 4.

[0073] Table 4

[0074]

[0075]

[0076] Example 3

[0077] A polymer composite hydrophobic enhanced bridge deck waterproof bonding layer is prepared from a coating slurry. The raw materials for preparing the coating slurry are as follows in parts by mass: Epoxy resin E51: 600 parts; Epoxy resin curing agent T31: 150 parts; Polyurethane AHK100: 400 parts; Fumed nano-silica: 7 parts; Fluorosilicon polymer PF-302: 11 parts; Polypropylene fiber: 8 parts.

[0078] The preparation method of the coating slurry is as follows:

[0079] Step 1: Mix 600 parts of epoxy resin with 150 parts of epoxy resin curing agent, and use a magnetic stirrer to stir thoroughly at a rate of 1500 r / min for 5 min to uniformly mix the epoxy resin and the epoxy resin curing agent, obtaining an epoxy resin matrix material;

[0080] Step 2: Add 400 parts of polyurethane to the epoxy matrix material obtained in Step 1, and use a magnetic stirrer to stir thoroughly at a rate of 2000 r / min for 5 min, obtaining a matrix material of the waterproof bonding layer;

[0081] Step 3: Mix 7 parts of fumed nano-silica powder and 11 parts of fluorosilicon polymer, and use ultrasonic dispersion to uniformly disperse the fumed nano-silica powder in the fluorosilicon polymer, obtaining a solid-liquid sol dispersion system;

[0082] Step 4: Add the solid-liquid sol dispersion system obtained in Step 3 to the matrix material of the waterproof bonding layer obtained in Step 2, and use a magnetic stirrer to stir thoroughly again at a rate of 2000 r / min for 8 min, obtaining a hydrophobic enhanced waterproof bonding matrix material;

[0083] Step 5: Add 8 parts of polypropylene fiber to the hydrophobic enhanced waterproof bonding matrix material obtained in Step 4, and stir thoroughly again to fully mix all component materials, finally obtaining a novel polymer composite hydrophobic enhanced bridge deck waterproof bonding coating slurry. The optimal spreading amount of this polymer composite waterproof bonding material is 2.25 kg / m 2 , and wait for it to cure to form a novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer.

[0084] For the novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer finally prepared in this embodiment, an apparent contact angle measuring instrument was used to measure the apparent contact angle of the material surface, and a waterproof test was used to measure its water impermeability. The bonding performance under different working conditions was measured through a shear test, mainly including the anti-fatigue performance, freeze-thaw resistance performance, immersion strength, etc. of the material. In addition, various tests were used to test the temperature change resistance performance, low temperature flexibility, corrosion resistance, frost resistance, tensile strength and elongation at break of the material. The technical indexes of the novel polymer composite hydrophobic enhanced bridge deck waterproof bonding layer are shown in Table 5.

[0085] Table 5

[0086]

[0087]

[0088] The parameter changes and relevant performance test data of the remaining examples (S1-12) and comparative examples (D1-5) and Example 1 are as follows. For the convenience of distinction, the same parts as Example 1 in Table 6 are not filled in:

[0089] Table 6

[0090]

[0091]

[0092] As can be seen from Table 6, in Example 1, the recommended mix ratio of the present invention was adopted (500 parts of E51 epoxy resin; 125 parts of curing agent; 500 parts of AHK100 polyurethane; 7 parts of 7nm silica; 11 parts of PF-302 fluorosilicone polymer; 8 parts of polypropylene fiber), and the obtained inclined shear strength was 1.8 MPa, it was water-impermeable under a pressure of 0.3 MPa, and the contact angle was 125.3°. In Example 2, the mixing ratio of E51 and AHK100 was adjusted to 4:6. At this time, the content of polyurethane increased, resulting in a decrease in strength and an increase in hydrophobic performance. In Example 3, the mixing ratio of E51 and AHK100 was adjusted to 6:4. At this time, the content of epoxy resin increased, resulting in an increase in strength and a decrease in hydrophobic performance. In Example 4, the dosage of fumed silica was increased on the basis of Example 1, which caused a slight decrease in strength and a significant enhancement in hydrophobic performance. In Example 5, the dosage of fluorosilicone polymer was reduced on the basis of Example 1, which caused an increase in strength and a decrease in hydrophobic performance. In Example 6, the fiber dosage was reduced on the basis of Example 1, which caused a decrease in bond strength, but the contact angle basically remained unchanged. In Example 7, E51 was replaced with E44 on the basis of Example 1, which caused a certain degree of decrease in both strength and contact angle. In Example 8, E51 was replaced with E20 on the basis of Example 1, which also caused a certain degree of decrease in both strength and contact angle. In Example 9, AHK100 was replaced with PUR-S5718 on the basis of Example 1, which caused a decrease in strength and an increase in contact angle. In Example 10, AHK100 was replaced with PU-150 on the basis of Example 1, which caused a decrease in strength and an increase in contact angle. In Example 11, PF-302 was replaced with PF-311, which caused a decrease in strength and a decrease in hydrophobic performance. In Example 12, PF-302 was replaced with PF-208, which caused a decrease in strength and a decrease in hydrophobic performance. The above examples have differences in strength and contact angle, but they can all achieve water impermeability under a pressure of 0.3 MPa and have excellent waterproof performance.

[0093] Comparative Example 1: On the basis of Example 1, AHK100 was replaced with HDI, which led to a significant decrease in strength and a smaller decrease in contact angle, but it could not withstand a water seepage pressure of 0.3 MPa. Comparative Example 2: On the basis of Example 1, 7-40 nm hydrophobic silica was replaced with 1-2 μm hydrophobic silica, which led to a significant decrease in both strength and contact angle. Comparative Example 3: On the basis of Example 1, 7-40 nm hydrophobic silica was replaced with 7 nm hydrophilic silica, which led to a large decrease in contact angle and could not withstand a water seepage pressure of 0.3 MPa under the condition of unchanged strength. Comparative Example 4: On the basis of Example 1, PF-302 was replaced with NFS7300, which led to a slight increase in strength and a significant decrease in contact angle, and it could not withstand a water seepage pressure of 0.3 MPa. Comparative Example 5: On the basis of Example 1, polypropylene fiber was replaced with K1514, which led to a decrease in strength and could not withstand a water seepage pressure of 0.3 MPa, but the decrease in contact angle was smaller. In the above comparative examples, there are problems that they cannot withstand a water seepage pressure of 0.3 MPa, or there are situations where the strength and contact angle are significantly reduced.

[0094] The above-described embodiments only represent the specific implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.

Claims

1. A polymer composite hydrophobic enhanced bridge deck waterproof bonding layer, characterized by: The coating slurry is prepared from the following raw materials, calculated by weight: Epoxy resin: 400-600 parts; Epoxy resin curing agent: 100-150 parts; Polyurethane: 400-600 parts; Fumed nano-silicon dioxide: 5-10 parts; Fluorosilicone polymer: 7-15 parts; Polypropylene fiber: 6 to 10 parts.

2. The polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 1, characterized in that: The mass ratio of epoxy resin and epoxy resin curing agent is 1:4, the mass ratio of epoxy resin to polyurethane is 1:1, the amount of fluorosilicone polymer is 11% of the total mass of polyurethane and epoxy resin blend, the amount of fumed nanosilica is 0.7% of the total mass of polyurethane and epoxy resin blend, and the amount of polypropylene fiber is 0.8% of the total mass of polyurethane and epoxy resin blend.

3. The polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 1, characterized in that: The particle size of the gas phase nano-silicon dioxide is 7-40nm.

4. The polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 2, characterized in that: The polyurethane is one or more of AH-K100, PUR-S5718 and TG9853.

5. The polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 2, characterized in that: The fluorosilicone polymer is one or more of PF-302, PF-311, and PF-316.

6. The polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 1, characterized in that: The epoxy resin is one or more of E51, E44 and E20.

7. A method for preparing the polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to any one of claims 1 to 6, characterized in that: The method includes preparing a coating slurry, and then spreading the coating slurry on the bridge deck to form a waterproof bonding layer. The method for preparing the coating slurry is as follows: Step A: mixing epoxy resin and epoxy resin curing agent according to a ratio to obtain an epoxy resin matrix material; Step B: adding polyurethane to the epoxy resin matrix material according to the ratio to obtain a waterproof bonding matrix material; Step C: mixing the fumed nano-silicon dioxide powder and the fluorine-silicon polymer according to a ratio to obtain a solid-liquid sol dispersion system; Step D: adding the solid-liquid sol dispersion prepared in step C to the waterproof bonding matrix material obtained in step B according to the ratio to obtain a hydrophobic enhanced waterproof bonding matrix material; Step E: Adding polypropylene fiber to the hydrophobic enhanced waterproof bonding matrix material obtained in step D according to the ratio to obtain a coating slurry.

8. The method for preparing a polymer composite hydrophobic enhanced bridge deck waterproof bonding layer according to claim 7, characterized in that: The coating slurry is spread in an amount of 2.25-3 kg / m 2 .

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