A high-speed railway concrete bridge deck waterproof layer rapid repair material and a preparation method thereof

Abstract

A kind of high-speed railway concrete bridge deck waterproof layer rapid repair material, by 100 parts by mass of A material and 100-150 parts by mass of B material is formed, wherein: the A material is formed by the following materials by mass fraction: bio-based polyol 15-23 parts, polyaspartic acid ester resin 42-48 parts, filler 21-29 parts, substrate wetting agent 0.3-0.9 parts, solvent 5-15 parts, catalyst 0.1-0.4 parts;The B material is formed by the following materials by mass fraction: isocyanate 25-35 parts, polycarbonate polyol 50-58 parts, polyether polyol 3-8 parts, solvent 5-15 parts.The waterproof layer rapid repair material combines the existing primer, waterproof layer, face coat three in one, has the high adhesion, high permeability of primer, the high physical and mechanical properties of waterproof layer and the high weather resistance of face coat, has the convenience of construction short period, construction does not need large equipment support, construction efficiency is high, meet the needs of bridge deck waterproof disease maintenance in the window period of railway operation.

Description

[0001] Invention Technology

[0002] This invention relates to the field of waterproofing technology for high-speed railway concrete bridge decks, specifically to a rapid repair material for waterproofing high-speed railway concrete bridge decks and its preparation method. Background Technology

[0003] Railway concrete bridges are designed for durability, and a waterproof layer must be installed on the bridge deck during construction to prevent rainwater from seeping in and causing accelerated damage and destruction to the bridge structure. This is an important technical means to improve the durability of bridge structures.

[0004] In my country, railway concrete bridges commonly use waterproofing membranes or coatings. Relatively speaking, coatings, as waterproofing layers, do not have the disadvantages of membranes, such as difficult overlapping, poor adhesion, and unsatisfactory detail treatment. Moreover, the use of high-performance coatings is the development trend of waterproofing railway concrete bridge decks. In the early construction of high-speed railways in my country, high-performance waterproofing coatings were widely used, drawing on foreign experience. However, due to factors such as construction weather and construction quality, some waterproofing layers gradually showed signs of yellowing, damage, and even peeling during later operation and maintenance.

[0005] Currently, maintenance work on operating railways in my country is mainly concentrated during the maintenance window period, from 0:00 to 4:00 at night, using access gates and stairs for maintenance. The effective maintenance time is short; after deducting procedures such as inspections at the access gates, the actual construction time may be less than 3 hours. Furthermore, large machinery cannot be transported to the bridge deck construction site through these access gates, posing difficulties for repairing bridge deck waterproofing defects. Existing technical standards and materials for waterproofing layers on high-speed railway bridges are mainly designed for newly built railway projects. They generally consist of a primer layer, a waterproofing layer, and a topcoat layer. The waterproofing system is complex, with long intervals between each step. For example, the primer layer typically requires the surface to dry completely before the waterproofing layer can be applied, taking anywhere from 2 to 4 hours or more. This makes it difficult to complete within a single maintenance window. Multiple maintenance windows with long intervals between steps mean the coating may be exposed to rain, dust, and debris after application, posing a significant risk to the quality of the waterproofing layer. Moreover, existing bridge deck waterproofing materials have low construction efficiency during maintenance windows, hindering the repair of bridge deck waterproofing defects.

[0006] CN102746783A discloses a two-component colored environmentally friendly elastic polymer hydraulic protective coating. This coating consists of two independent components, A and B, which are mixed and applied on-site. Component A includes polyether polyol and isocyanate, while component B includes a resin mixture, liquid additives, and powdered fillers. All raw materials used are non-toxic and harmless, exhibiting excellent waterproof, corrosion-resistant, and wear-resistant properties. It also achieves high-penetration bonding with concrete substrates, extending its service life.

[0007] CN109439177A discloses a solvent-free polyurethane waterproof coating for concrete bridge decks, comprising component A and component B. Component A includes 20-80 parts of a diisocyanate compound, 20-50 parts of a diol polymer, 0.01-0.1 parts of a catalyst, and 5-20 parts of a sealing agent. Component B is a curing agent. The coating exhibits excellent mechanical properties and resistance to dynamic compaction, meeting the requirements for use on ballasted tracks and effectively preventing leaks.

[0008] CN107418408A discloses a methacrylic acid resin-modified polyurethane waterproof coating for concrete pavement of railway ballast track bridges. This coating is composed of component A and component B mixed in a 4-6:1 ratio. Component A consists of 30-50 parts carboxymethyl methacrylic acid resin, 30-50 parts active methacrylic acid resin, 0.5-2 parts N,N-dimethyl-p-toluidine, 0.5-2 parts anti-settling agent, 5-20 parts pigment, 10-20 parts filler, 0.5-1 part wetting and dispersing agent, 0.5-1 part defoamer, 0.1-0.5 parts ultraviolet absorber, and 0.1-0.5 parts light stabilizer. Component B consists of 10-20 parts hexamethylene diisocyanate trimer, 10-20 parts butyl acetate, and 1-3 parts benzoyl peroxide. This waterproof coating adheres well to concrete surfaces, is not easily peeled off, and also possesses good mechanical properties.

[0009] Therefore, it is necessary to improve the existing waterproofing system structure and waterproofing layer materials to meet the needs of window period maintenance. Summary of the Invention

[0010] To address the problems of the prior art, this invention provides a rapid repair material for waterproofing layers on high-speed railway concrete bridge decks and its preparation method.

[0011] The purpose of this invention is to provide a rapid repair material for waterproofing layers of high-speed railway concrete bridge decks and its preparation method. The provided waterproofing layer material has a simple waterproofing system structure, is convenient to construct with a short cycle, does not require large equipment support during construction, and has high construction efficiency, meeting the needs of bridge deck waterproofing repair during railway operation windows.

[0012] The objective of this invention and the technical problem it solves are achieved by the following technical solution: According to a first aspect of this invention, a rapid repair material for the waterproof layer of a high-speed railway concrete bridge deck is provided, comprising 100 parts by weight of component A and 100-150 parts by weight of component B, wherein:

[0013] Material A is composed of the following materials in parts by weight: 15-23 parts of bio-based polyol, 42-48 parts of polyaspartic acid ester resin, 21-29 parts of filler, 0.3-0.9 parts of substrate wetting agent, 5-15 parts of solvent, and 0.1-0.4 parts of catalyst.

[0014] Material B is composed of the following materials in parts by weight: 25-35 parts isocyanate, 50-58 parts polycarbonate polyol, 3-8 parts polyether polyol, and 5-15 parts solvent.

[0015] Preferably, the material is characterized by comprising 100 parts by weight of material A and 110-120 parts by weight of material B, wherein:

[0016] Material A is composed of the following materials in parts by weight: 18-20 parts of bio-based polyol, 44-46 parts of polyaspartic acid ester resin, 24-26 parts of filler, 0.4-0.6 parts of substrate wetting agent, 9-11 parts of solvent, and 0.2-0.3 parts of catalyst.

[0017] Material B is composed of the following materials in parts by weight: 28-32 parts isocyanate, 53-56 parts polycarbonate polyol, 4-6 parts polyether polyol, and 8-12 parts solvent.

[0018] Preferably, the bio-based polyol is a castor oil derivative polyol, specifically Vertellus's M-280, with a functionality of 3-5 and a hydroxyl value of 260-300 mg KOH / g.

[0019] Preferably, the polyaspartic ester resin is composed of 15.1-25.5 parts of Bayer NH1420 and 21-29 parts of Bayer NH1520.

[0020] Preferably, the filler is wollastonite powder.

[0021] Preferably, the substrate wetting agent is BYK-333.

[0022] Preferably, the solvent is butyl acetate.

[0023] Preferably, the catalyst is bismuth isooctanoate.

[0024] Preferably, the isocyanate is cyclohexanedimethyl diisocyanate.

[0025] Preferably, the polycarbonate polyol has a molecular weight of 2000-4000, and the polycarbonate polyol is polypropylene carbonate diol.

[0026] Preferably, the polyether polyol has a molecular weight of 300-700, and the polyether polyol is pentaerythritol polyoxypropylene tetraol.

[0027] According to a second aspect of the present invention, a method for preparing the above-mentioned rapid repair material for waterproof layer of high-speed railway concrete bridge deck is provided, comprising the following steps:

[0028] S1: Preparation of Material A: Bio-based polyol, polyaspartic acid ester resin, and filler are sequentially added to a high-speed disperser. The stirring speed is set to 1000-2000 r / min, and the mixture is stirred for 30-60 min. Then, the mixture is ground using a grinding device until the sampled fineness is below 30 μm. The ground material is then added to a reaction vessel, and the stirring speed is set to 60-100 r / min. The temperature is raised to 105-115 degrees Celsius, and vacuum dehydration is performed for 2-3 hours with a vacuum degree less than or equal to -0.095 MPa. After dehydration, the moisture content is sampled and tested to be below 0.05%. The temperature is then lowered to 30-40 degrees Celsius, and the substrate wetting agent, solvent, and catalyst are added sequentially. The stirring speed is adjusted to 40-60 r / min, and the mixture is stirred for 90-120 min. After stirring, the impurities are removed by filtration to obtain Material A.

[0029] To prepare component B, polycarbonate polyol and polyether polyol are added to a reaction vessel. The stirring speed is set to 60-100 r / min, and the temperature is raised to 105-115 degrees Celsius. Vacuum dehydration is carried out for 2-3 hours with a vacuum degree of less than or equal to -0.095 MPa. After dehydration, a sample is taken to test the moisture content, which is below 0.05%. The temperature is then lowered to 80-90 degrees Celsius, and isocyanate is added. The stirring speed is 40-60 r / min, and the temperature is maintained at 80-90 degrees Celsius for 2 hours. After the NCO value is found to be qualified, the temperature is lowered to 30-40 degrees Celsius, solvent is added, and stirring is continued for 90-120 minutes. Impurities are removed by filtration to obtain component B.

[0030] S2: Mix the A and B materials prepared in step S1 in an environment of 15-35°C at a mass ratio of 100:100-150, preferably at a mass ratio of 100:109-119, and more preferably at a mass ratio of 100:110-115. After mixing, apply the mixture directly to the pre-treated clean bridge deck concrete base and cure it under natural conditions for more than 7 days to obtain the bridge deck waterproof layer.

[0031] The castor oil derivative polyol used in this invention has excellent adhesion, moisture resistance, water resistance, and chemical resistance. The substrate wetting agent BYK-333 used has the properties of reducing the surface tension of the coating and increasing the wettability of the concrete substrate. The solvent butyl acetate used has the properties of low toxicity, good solubility, and strong penetration into the concrete substrate. Through the synergistic effect of the above components, the waterproof layer of this invention has excellent bonding strength and can meet the bonding requirements of bridge deck waterproofing technology without the need for a primer.

[0032] This invention also utilizes polypropylene carbonate diol, which combines the hydrolysis resistance of polyether polyols with the high physical and mechanical properties of polyester polyols, exhibiting excellent weather resistance, hydrolysis resistance, and abrasion resistance. The polyaspartic acid ester resin used in this invention has a large number of secondary amino groups, exhibiting moderate reactivity with isocyanates, and the generated urea groups are highly polar, facilitating the formation of hydrogen bonds within the material and improving its physical properties. The pentaerythritol polyoxypropylene tetraol used in this invention has four hydroxyl groups with a symmetrical three-dimensional structure, enhancing hardness, material strength, and improving drying performance. The cyclohexanedimethyl diisocyanate used in this invention has a rigid cyclic structure, obtained by hydrogenating the benzene ring of phenyl diisocyanate, further improving its resistance to yellowing, making the coating light-stable, non-yellowing, and exhibiting excellent weather resistance and toughness. Through the synergistic effect of the above components, the waterproof layer of this invention possesses excellent physical and mechanical properties and weather resistance, meeting the physical property requirements of the waterproof layer and the weather protection performance of the topcoat in bridge deck waterproofing technology without the need for a topcoat.

[0033] Compared with existing waterproofing layers for high-speed railway concrete bridge decks, the waterproofing system of this invention simplifies the three layers—primer, waterproofing layer, and topcoat—into a single layer. Through the synergistic combination of the components in the formula, this invention's waterproofing layer possesses the high adhesion and permeability of the primer, the high physical and mechanical properties of the waterproofing layer, and the high weather resistance of the topcoat. The material exhibits excellent performance, the construction process is convenient, and it meets the usage requirements for maintenance during operational railway windows.

[0034] The beneficial effects of this invention are as follows:

[0035] The rapid repair material for waterproofing high-speed railway concrete bridge decks of this invention, through the synergistic combination of its components, achieves a three-in-one waterproofing layer that combines the high adhesion and permeability of the base layer, the high physical and mechanical properties of the waterproofing layer, and the high weather resistance of the top layer. The material exhibits excellent performance, a convenient construction process, and meets the usage requirements for maintenance during operational railway windows. Verification has shown that the waterproofing layer prepared using this invention has an adhesive strength greater than 4.0 MPa, a tensile strength greater than 25 MPa, and an elongation at break greater than 400%. After treatment with acid, alkali, salt, heat, damp heat, and ultraviolet light, the retention rates of tensile strength and elongation at break are all greater than 90%. After 1500 hours of accelerated aging in artificial climate, the coating shows no significant discoloration or chalking, and exhibits no blistering or cracking. Detailed Implementation

[0036] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] The content of the present invention will be described in detail below with reference to specific embodiments:

[0038] Example 1

[0039] A rapid repair material for the waterproof layer of high-speed railway concrete bridge deck, comprising 100 parts by weight of component A and 114 parts by weight of component B, wherein:

[0040] Material A is composed of the following materials in parts by weight:

[0041] 19 portions of Vertellus' M-280, a castor oil derivative polyol.

[0042] 25 parts of polyaspartic acid ester resin Bayer NH1420;

[0043] 20.3 parts of polyaspartic acid ester resin Bayer NH1520;

[0044] 25 parts of wollastonite powder;

[0045] Substrate wetting agent BYK-333 0.5 parts;

[0046] 10 parts of butyl acetate;

[0047] Catalyst: 0.2 parts of bismuth isooctanoate.

[0048] Material B is composed of the following materials in parts by weight:

[0049] 30.8 parts of cyclohexanedimethyl diisocyanate;

[0050] 54.2 parts of polypropylene carbonate diol with a number average molecular weight of 3000;

[0051] Five parts of pentaerythritol polyoxypropylene tetraol with a number average molecular weight of 400;

[0052] 10 parts of butyl acetate.

[0053] The preparation method of the rapid repair material for the waterproof layer of high-speed railway concrete bridge deck in this embodiment includes the following steps:

[0054] S1: Preparation of Material A: Bio-based polyol, polyaspartic acid ester resin, and filler are sequentially added to a high-speed disperser. The stirring speed is set to 1000-2000 r / min, and the mixture is stirred for 30-60 min. Then, the mixture is ground using a grinding device until the sampled fineness is below 30 μm. The ground material is then added to a reaction vessel, and the stirring speed is set to 60-100 r / min. The temperature is raised to 105-115 degrees Celsius, and vacuum dehydration is performed for 2-3 hours with a vacuum degree less than or equal to -0.095 MPa. After dehydration, the moisture content is sampled and tested to be below 0.05%. The temperature is then lowered to 30-40 degrees Celsius, and the substrate wetting agent, solvent, and catalyst are added sequentially. The stirring speed is adjusted to 40-60 r / min, and the mixture is stirred for 90-120 min. After stirring, the impurities are removed by filtration to obtain Material A.

[0055] To prepare component B, polycarbonate polyol and polyether polyol are added to a reaction vessel. The stirring speed is set to 60-100 r / min, and the temperature is raised to 105-115 degrees Celsius. Vacuum dehydration is carried out for 2-3 hours with a vacuum degree of less than or equal to -0.095 MPa. After dehydration, a sample is taken to test the moisture content, which is below 0.05%. The temperature is then lowered to 80-90 degrees Celsius, and isocyanate is added. The stirring speed is 40-60 r / min, and the temperature is maintained at 80-90 degrees Celsius for 2 hours. After the NCO value is found to be qualified, the temperature is lowered to 30-40 degrees Celsius, solvent is added, and stirring is continued for 90-120 minutes. Impurities are removed by filtration to obtain component B.

[0056] S2: Mix materials A and B prepared in step S1 at a mass ratio of 100:114 in an environment of 25°C. After mixing, apply the mixture directly to the pre-treated and cleaned bridge deck concrete substrate. Allow it to cure naturally for at least 7 days to obtain the bridge deck waterproof layer. For the coating used for physical property testing, pour the mixed material into a mold coated with a release agent and cure for at least 7 days as required.

[0057] Furthermore, in preparing the rapid repair material for the waterproof layer of high-speed railway concrete bridge decks according to this embodiment, various other additives such as antioxidants, light stabilizers, pigments, and fillers can be added as needed. This embodiment does not impose any particular restrictions on the types of antioxidants, light stabilizers, pigments, and fillers; those skilled in the art can determine the specific types and amounts used according to their needs.

[0058] Example 2 Screening of bio-based polyols

[0059] Samples were prepared using the raw materials specified in Table 1 and the method described in Example 1. The prepared samples were numbered 1#, 2#, 3#, 4#, 5#, 6#, and 7#. The drying time, adhesion strength to the substrate, tensile strength, and elongation at break of the seven groups of samples were then measured, and the results are shown in Table 1.

[0060] Table 1

[0061]

[0062]

[0063] As shown in Table 1, the addition of castor oil derivative polyol M-280 significantly improves the adhesion strength and tensile strength to the concrete substrate, while also contributing to the drying time of the coating. This is likely because M-280, as a derivative of castor oil, provides a certain amount of triglycerides of natural fatty acids, enhancing the wettability of the coating to the concrete substrate. Simultaneously, M-280, obtained from castor oil and small-molecule polyols through alcoholysis and transesterification, possesses higher functionality, leading to a higher crosslinking ratio in the coating and thus increasing the tensile strength of the film. Furthermore, the increased primary hydroxyl content enhances the reactivity of the coating, contributing to the drying time.

[0064] Example 3: Screening of substrate wetting agent addition amount

[0065] Samples were prepared using the raw materials with the formulation shown in Table 2, following the method described in Example 1. The prepared samples were numbered 1#, 2#, 3#, 4#, 5#, 6#, and 7#. The adhesion strength between the seven groups of samples and the substrate was then measured, and the results are shown in Table 2.

[0066] Table 2

[0067]

[0068]

[0069] As can be seen from Table 2, the addition of substrate wetting agent helps to improve the adhesion strength between the coating and the concrete substrate. It reduces the surface tension of the coating and improves the wettability of the concrete substrate, so that it still has good adhesion strength without the use of primer.

[0070] Example 4: Screening of Solvent Addition Amount

[0071] Samples were prepared using the raw materials formulated in Table 3 and the method described in Example 1. The prepared samples were numbered 1#, 2#, 3#, 4#, 5#, and 6#. The surface bubble condition, adhesion strength to the substrate, damage characteristics, and depth of substrate damage were then measured for each of the six groups of samples. The results are shown in Table 3.

[0072] Table 3

[0073]

[0074]

[0075] As can be seen from Table 3, the addition of butyl acetate solvent helps to improve the adhesion strength between the coating and the concrete substrate. It greatly reduces the viscosity of the coating and improves the penetration into the concrete substrate. At the same time, butyl acetate has a certain effect of eliminating air bubbles on the coating surface during the volatilization process.

[0076] Example 5: Selection of fillers and screening of addition amount

[0077] Samples were prepared using the raw materials formulated as shown in Table 4, following the method described in Example 1. The prepared samples were numbered 1#, 2#, 3#, 4#, 5#, and 6#. The adhesion strength between the six groups of samples and the substrate was then measured after different placement times, and the results are shown in Table 4.

[0078] Table 4

[0079]

[0080]

[0081] Table 4 shows that the addition of wollastonite powder as a filler helps to improve the durability of the bond strength between the coating and the concrete substrate. It is well known that all materials undergo varying degrees of volume shrinkage and expansion with changes in temperature. When a coating is applied to the substrate surface, the bonding points between the coating and the coated surface will be damaged to varying degrees due to the effects of thermal expansion and contraction. Generally speaking, the coefficient of thermal expansion of the coating is significantly greater than that of the substrate; for example, the coefficient of linear expansion of polyurethane is typically 180 × 10⁻⁶. -6 At ℃, the coefficient of linear expansion of concrete is generally 10×10. -6 Because the temperature is relatively low, the coating expands or contracts more than the substrate when the temperature changes, causing corresponding deformation of the coating and resulting in stress between the coating and the concrete substrate. The magnitude of this stress is related to the difference in the coefficients of linear expansion between the coating and the concrete. Long-term stress damages the adhesion, causing wrinkles, cracks, etc., and reducing the adhesion of the coating. Therefore, reducing the coefficient of linear expansion of the coating is necessary. Wollastonite powder has good insulation, thermal stability, and dimensional stability, and most importantly, its coefficient of linear expansion is 6.5 × 10⁻⁶. -6 / ℃, its addition can greatly reduce the difference in the coefficient of linear expansion between the coating and the concrete substrate, that is, reduce the stress value between the two when the temperature changes, thus improving its bonding strength durability.

[0082] Example 6: Selection and Performance Comparison of Main Raw Materials

[0083] Samples were prepared using the raw materials formulated as shown in Table 5, following the method described in Example 1. The prepared samples were numbered 1#, 2#, 3#, 4#, 5#, 6#, 7#, and 8#. The tensile strength, elongation at break, resistance to damp heat, resistance to ultraviolet aging, and surface condition of the coating after artificial weathering were then measured for each of the eight groups of samples. The results are shown in Table 5.

[0084] Table 5

[0085]

[0086]

[0087]

[0088] As shown in the comparative experiments of #1 and #2 in Table 5, pentaerythritol polypropylene oxide tetraol has a symmetrical spatial structure. Its appropriate addition can increase the crosslinking density of the material, significantly improving its tensile strength and also contributing to its aging resistance. Comparative experiments of #1 and #3, #4 in Table 5 show that polyaspartic acid ester resin has the best overall performance. Compared with aromatic bis-amino groups, its strength is slightly lower, but its elongation is significantly improved, and its UV aging resistance is greatly enhanced. This may be because after the aromatic bis-amino groups react with isocyanates, the urea groups connect with the benzene ring to form a conjugated structure, generating chromophores such as quinone structures under ultraviolet light. Compared with polyether polyols, polyaspartic acid ester polyurea contains a large number of ester and urea groups, which can form numerous hydrogen bonds, thus greatly improving its tensile strength. Comparative experiments of #1 and #5, #6 in Table 5 show that polypropylene carbonate diol combines the high mechanical properties of ordinary alkyd polyester polyols with the good weather resistance of polyether polyols. As can be seen from the comparative experiments of 1#, 7#, and 8# in Table 5, HXDI, as an alicyclic diisocyanate, has better resistance to yellowing and weathering than TDI, an aromatic diisocyanate, and better physical and mechanical properties than HDI, an alicyclic diisocyanate.

[0089] Example 7

[0090] The preparation method and steps are the same as in Example 1, except that the rapid repair material for the waterproof layer of high-speed railway concrete bridge deck is composed of 100 parts of component A and 119 parts of component B by weight, wherein:

[0091] Material A is composed of the following materials in parts by weight:

[0092] 23 parts of Vertellus' M-280, a castor oil derivative polyol.

[0093] 21 parts of polyaspartic acid ester resin Bayer NH1420;

[0094] 25.5 parts of polyaspartic acid ester resin Bayer NH1520;

[0095] 21 parts of wollastonite powder;

[0096] 0.4 parts of BYK-333 substrate wetting agent;

[0097] 9 parts of butyl acetate;

[0098] Catalyst: 0.1 parts of bismuth isooctanoate.

[0099] Material B is composed of the following materials in parts by weight:

[0100] 33.1 parts of cyclohexanedimethyl diisocyanate;

[0101] 53.9 parts of polypropylene carbonate diol with a number average molecular weight of 3000;

[0102] Six parts of pentaerythritol polyoxypropylene tetraol with a number average molecular weight of 400;

[0103] 7 parts of butyl acetate.

[0104] Example 8

[0105] The preparation method and steps are the same as in Example 1, except that the rapid repair material for the waterproof layer of high-speed railway concrete bridge deck is composed of 100 parts of component A and 109 parts of component B by weight, wherein:

[0106] Material A is composed of the following materials in parts by weight:

[0107] 15 parts of Vertellus' M-280, a castor oil derivative polyol;

[0108] 29 parts of polyaspartic acid ester resin Bayer NH1420;

[0109] 15.1 parts of polyaspartic acid ester resin Bayer NH1520;

[0110] 29 parts of wollastonite powder;

[0111] Substrate wetting agent BYK-333 0.6 parts;

[0112] 11 parts of butyl acetate;

[0113] Catalyst: 0.3 parts of bismuth isooctanoate.

[0114] Material B is composed of the following materials in parts by weight:

[0115] 28.7 parts of cyclohexanedimethyl diisocyanate;

[0116] 54.3 parts of polypropylene carbonate diol with a number average molecular weight of 3000;

[0117] Four parts of pentaerythritol polyoxypropylene tetraol with a number average molecular weight of 400;

[0118] 13 parts of butyl acetate.

[0119] The samples obtained from the three schemes of Example 1, Example 7 and Example 8 were tested for fineness, solid content, drying time, tensile properties and retention rate after aging, tear properties, low temperature flexibility, impermeability, adhesion strength to the substrate, alkali resistance, water absorption, impact resistance, artificial weathering resistance and abrasion resistance. The test results were compared with the requirements of the current railway bridge deck waterproofing technical conditions. The test standards and test results are shown in Table 6.

[0120] Table 6

[0121]

[0122]

[0123]

[0124] As shown in Table 6, the samples prepared in Examples 1, 7, and 8 can meet the adhesive strength requirements of the waterproof layer after applying a primer in all three technical conditions without using a primer. They also meet the performance requirements for the waterproof coating in terms of physical and mechanical properties, aging resistance, and low-temperature flexibility in all three technical conditions. Furthermore, they meet the performance requirements for the topcoat in terms of impact resistance, artificial weathering resistance, and abrasion resistance in all three technical conditions. Moreover, since the waterproof material of this invention has a single-layer structure, it is simple in structure, convenient to construct, and highly efficient, making it very suitable for the needs of waterproof layer repair work during railway operation windows.

[0125] Example 9: Adhesion test with existing railway waterproofing layer surface

[0126] In response to the possibility of localized damage to existing railway waterproofing layers, where repairs are only performed on specific areas, it is necessary to apply waterproofing coatings to both the exposed concrete substrate and certain areas of the existing waterproofing layer to ensure the integrity of the waterproofing layer. Therefore, it is essential to test the adhesion between the repair material and the existing waterproofing layer surface. Sample preparation: Waterproofing materials from the "Provisional Technical Conditions for Spraying Polyurea Waterproofing Layers on Concrete Bridge Deck of Passenger Dedicated Railway Bridges (Science and Technology Base

[2009] No. 117)" and "Technical Conditions for Thin-Coat Polyurethane Waterproofing Layers on Concrete Bridge Deck of High-Speed ​​Railways (Q / CR568-2017)" were used to prepare waterproofing layers on the concrete substrate according to the requirements and then cured. After curing, the surface was wiped clean with a cloth, and then the coatings from Examples 1, 7, and 8 of this invention were applied and cured. After curing, the adhesion strength was tested according to the requirements of GB / T 5210, and the results are shown in Table 7.

[0127] Table 7

[0128]

[0129] As can be seen from Table 7, the samples made with the coatings of Examples 1, 7 and 8 all have a bonding strength > 4.5 MPa with the waterproof layer under both technical conditions, which meets the requirements for the repair of waterproof layer of railway concrete bridge.

[0130] The present invention has been described above with reference to preferred embodiments, but the scope of protection of the present invention is not limited thereto. All technical solutions falling within the scope of the claims are within the scope of protection of the present invention. Various modifications can be made to the present invention, and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A rapid repair material for the waterproof layer of high-speed railway concrete bridge deck, comprising 100 parts by weight of component A and 100-150 parts by weight of component B, wherein: Material A is composed of the following materials in parts by weight: 15-23 parts of bio-based polyol, 42-48 parts of polyaspartic acid ester resin, 21-29 parts of filler, 0.3-0.9 parts of substrate wetting agent, 5-15 parts of solvent, and 0.1-0.4 parts of catalyst. The B component is composed of the following materials in parts by mass: 25-35 parts isocyanate, 50-58 parts polycarbonate polyol, 3-8 parts polyether polyol, and 5-15 parts solvent. The filler is wollastonite powder; The substrate wetting agent is BYK-333; The solvent is butyl acetate; The catalyst is bismuth isooctanoate; The isocyanate is cyclohexanedimethyl diisocyanate; The polycarbonate polyol has a molecular weight of 2000-4000, and the polycarbonate polyol is polypropylene carbonate diol. The molecular weight of the polyether polyol is 300-700, and the polyether polyol is pentaerythritol polyoxypropylene tetraol. The bio-based polyol is a castor oil derivative polyol, specifically Vertellus's M-280, with a functionality of 3-5 and a hydroxyl value of 260-300 mg KOH / g. The polyaspartic acid ester resin is composed of 15.1-25.5 parts of Bayer NH1420 and 21-29 parts of Bayer NH1520.

2. The rapid repair material according to claim 1, characterized in that, It consists of 100 parts of material A and 110-120 parts of material B by weight.

3. The rapid repair material according to claim 1, characterized in that, Material A is composed of the following materials in parts by weight: 18-20 parts of bio-based polyol, 44-46 parts of polyaspartic acid ester resin, 24-26 parts of filler, 0.4-0.6 parts of substrate wetting agent, 9-11 parts of solvent, and 0.2-0.3 parts of catalyst. Material B is composed of the following materials in parts by weight: 28-32 parts isocyanate, 53-56 parts polycarbonate polyol, 4-6 parts polyether polyol, and 8-12 parts solvent.

4. A method for preparing the rapid repair material for the waterproof layer of high-speed railway concrete bridge deck as described in claim 1, comprising the following steps: S1: Preparation of Material A: Bio-based polyol, polyaspartic acid ester resin, and filler are sequentially added to a high-speed disperser. The stirring speed is set to 1000-2000 r / min, and the mixture is stirred for 30-60 min. Then, the mixture is ground using a grinding device until the sampled fineness is below 30 μm. The ground material is then added to a reaction vessel, and the stirring speed is set to 60-100 r / min. The temperature is raised to 105-115 degrees Celsius, and vacuum dehydration is performed for 2-3 hours with a vacuum degree less than or equal to -0.095 MPa. After dehydration, the moisture content is sampled and tested to be below 0.05%. The temperature is then lowered to 30-40 degrees Celsius, and the substrate wetting agent, solvent, and catalyst are added sequentially. The stirring speed is adjusted to 40-60 r / min, and the mixture is stirred for 90-120 min. After stirring, the impurities are removed by filtration to obtain Material A. To prepare component B, polycarbonate polyol and polyether polyol are added to a reaction vessel. The stirring speed is set to 60-100 r / min, and the temperature is raised to 105-115 degrees Celsius. Vacuum dehydration is carried out for 2-3 hours with a vacuum degree of less than or equal to -0.095 MPa. After dehydration, a sample is taken to test the moisture content, which is below 0.05%. The temperature is then lowered to 80-90 degrees Celsius, and isocyanate is added. The stirring speed is 40-60 r / min, and the temperature is maintained at 80-90 degrees Celsius for 2 hours. After the NCO value is found to be qualified, the temperature is lowered to 30-40 degrees Celsius, solvent is added, and stirring is continued for 90-120 minutes. Impurities are removed by filtration to obtain component B. S2: Mix the A and B materials prepared in step S1 in an environment of 15-35℃ at a mass ratio of 100:100-150. After mixing, apply the mixture directly to the pre-treated clean bridge deck concrete base and cure it under natural conditions for more than 7 days to obtain the bridge deck waterproof layer.

5. The method according to claim 4, characterized in that, The prepared A and B materials are mixed in an environment of 15-35℃ at a mass ratio of 100:110-115. After mixing, the mixture is directly applied to the pre-treated clean bridge deck concrete base and cured naturally for more than 7 days to obtain the bridge deck waterproof layer.

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