Slow-release self-repairing asphalt-based pre-laid waterproofing coiled material and preparation method thereof

Abstract

The application discloses a slow-release self-repairing asphalt-based pre-laid waterproof coiled material and a preparation method thereof, and relates to the technical field of waterproof coiled material preparation; the preparation method comprises the following steps: uniformly coating modified asphalt adhesives on two surfaces of a polyester base layer to form a first modified asphalt bonding layer and a second modified asphalt bonding layer; directly covering a polyester PET film layer on the first modified asphalt bonding layer; sequentially arranging a polymer film layer, coating modified asphalt adhesives to form a third modified asphalt bonding layer, and uniformly laying crystalline particles to form an active silicon crystalline particle layer on the second modified asphalt bonding layer; and drying and cooling to obtain the waterproof coiled material; the asphalt-based pre-laid waterproof coiled material prepared by the application can be self-repaired and waterproof, and has good tensile properties.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproofing coiled material preparation, and in particular to a slow-release self-repairing asphalt-based pre-paved waterproofing coiled material and a preparation method thereof. Background Art

[0002] With the gradual expansion and widespread application of underground pre-laid anti-adhesive technology, the common pre-laid material on the market is polymer self-adhesive film waterproofing membrane. However, as the construction of polymer self-adhesive film deepens, many problems also arise, such as the poor adherence of the polymer self-adhesive film waterproofing membrane, the difficulty in overlapping the base plate and the side wall waterproofing layer, and it is difficult to lay flat and solid in areas such as corners. In addition, the large overlapping edges of the membrane are mostly self-adhesive, and the peeling strength is easily affected by temperature, especially in low-temperature environments. The bonding effect is poor, which brings certain difficulties and challenges to the construction.

[0003] Due to these drawbacks, the commonly used polyester pre-paved waterproofing membrane has emerged on the market. These membranes are typically made of a polyester base, a modified asphalt rubber coating, and a surface layer of sintered isolation sand, produced through roller extrusion. Due to their excellent waterproofing, corrosion resistance, and ease of construction, they are widely used in underground waterproofing projects in industrial and civil buildings.

[0004] The polyester pre-paved waterproofing membrane currently on the market suffers from production process and formulation issues, including the use of recycled rubber powder for modification, excessively thick base, and mismatched process parameters. This results in a modified asphalt compound with insufficient fineness, a noticeable graininess, and poor body density. Furthermore, under magnification, the asphalt compound contains numerous pores and holes, resulting in low peel strength. After construction, overlapping joints are prone to poor adhesion, making water leakage, seepage, and blistering highly likely. Furthermore, the poor stability of asphalt compounds modified with recycled rubber powder and recycled resin particles severely impacts the membrane's service life.

[0005] At the same time, to achieve optimal waterproofing, underground pre-installed waterproofing requires two coats of waterproofing to meet Class 1 waterproofing requirements. This requirement for a composite coating of two coats of waterproofing for pre-installed membranes presents a challenge. Common existing approaches include applying a different coating to the underlayment layer, which is then bonded to the pre-installed membrane. However, cracking and damage to the underlayment layer can damage the waterproofing layer. Another approach involves dry-spraying a penetrating crystalline waterproofing coating onto the pre-installed membrane. This method is more economical, but can lead to contamination and uneven application on-site, making it less effective.

[0006] In summary, in order to solve the above problems, it is of great significance to provide a slow-release active self-repairing asphalt-based pre-paved waterproof membrane and a preparation method thereof. Summary of the Invention

[0007] The purpose of the present invention is to provide a slow-release self-repairing asphalt-based pre-paved waterproofing membrane and a preparation method thereof, so as to solve the problems raised in the prior art.

[0008] To achieve the above object, the present application provides the following technical solutions.

[0009] A preparation method of a slow-release self-repairing asphalt-based pre-laid waterproof coiled material, comprising the following steps:

[0010] S1: placing the ultra-thin long-fiber reinforced polyester base in silica gel modified asphalt for soaking, and taking out to obtain a polyester base layer;

[0011] S2: heating and stirring 200# asphalt and 70# asphalt uniformly, then sequentially adding SBS styrene-butadiene-styrene copolymer, SBR styrene-butadiene rubber, APAO polymer, silane coupling agent, magnesium hydroxide, and nano clay, fully melting and dispersing, adding talcum powder, and high-speed stirring and dispersing, and discharging through a colloid mill to obtain a modified asphalt binder;

[0012] S3: sequentially adding a permeating crystalline substance and cement into pure water, stirring uniformly, curing and shaping, crushing and screening to obtain particles, mixing the particles with an organic adhesive agent uniformly, and baking at 200-240 DEG C for 4-8 hours to obtain crystalline particles;

[0013] S4: uniformly coating the modified asphalt binder on both sides of the polyester base layer to form a first modified asphalt bonding layer and a second modified asphalt bonding layer, directly covering a polyester PET film layer on the first modified asphalt bonding layer, sequentially arranging a high-molecular film layer, coating the modified asphalt binder to form a third modified asphalt bonding layer, and uniformly laying the crystalline particles to form an active silicon crystalline particle layer on the second modified asphalt bonding layer, and drying and cooling to obtain a waterproof coiled material.

[0014] In S1, the silica gel modified asphalt is obtained by mixing 70# asphalt and SMA silicone rubber modified asphalt at a mass ratio of 1:1, and the soaking temperature is 175-185 DEG C.

[0015] More preferably, the raw materials of the modified asphalt binder include the following components: 32-41 parts by mass of 200# asphalt, 21-33 parts by mass of 70# asphalt, 3-8 parts by mass of SBS styrene-butadiene-styrene copolymer, 3-8 parts by mass of SBR styrene-butadiene rubber, 3-4 parts by mass of APAO polymer, 1-3 parts by mass of silane coupling agent, 3-5 parts by mass of magnesium hydroxide, 0.5-1.2 parts by mass of nano clay, and 26-30 parts by mass of talcum powder.

[0016] In S2, the heating and stirring temperature is 170-180 DEG C, the fully melting and dispersing temperature is 170-180 DEG C, and the time is 1.5-2 hours, and the high-speed stirring and dispersing temperature is 140-160 DEG C, and the time is 1-2 hours.

[0017] Preferably, the talc powder is pre-modified to obtain the modified talc powder, which is then added to the modified asphalt binder. The preparation method of the modified talc powder comprises the following steps:

[0018] (1) ultrasonically dispersing talc in a 28-30% ethanol solution, gradually adding a mixed solution of ethyl orthosilicate and trivinylmethoxysilane in a mass ratio of 1:0.5-0.7 under high-speed stirring, adjusting the pH to 3-3.5, stirring at 40-45°C for 30-40 minutes, adjusting the pH to 8-9, stirring at 40-50°C for 1-1.5 hours, and drying at 180-200°C under a nitrogen atmosphere to obtain olefin-modified talc;

[0019] (2) adding olefin modified talc powder to deionized water and ultrasonically dispersing the mixture uniformly, adding sodium acrylate and benzoyl peroxide, stirring the mixture at 60-70° C. for 3-4 hours, filtering, washing, and drying the mixture to obtain polymer modified talc powder;

[0020] (3) Add the polymer-modified talc and p-toluenesulfonic acid to hydroxy silicone oil, stir at 70-80° C. for 1.5-2 h, filter, and dry to obtain modified talc.

[0021] Among them, the alkenyl-modified talc powder includes the following raw materials in parts by mass: 3 to 4 parts of talc powder, 50 to 60 parts of ethanol solution, and a mixed solution of 9 to 12 parts of ethyl orthosilicate and trivinylmethoxysilane; the polymer-modified talc powder includes the following raw materials in parts by mass: 70 to 80 parts of deionized water, 7 to 8 parts of sodium acrylate, and 0.1 to 0.2 parts of benzoyl peroxide; the modified talc powder includes the following raw materials in parts by mass: 15 to 17 parts of modified talc powder, 0.5 to 1 part of p-toluenesulfonic acid, and 20 to 25 parts of hydroxy silicone oil.

[0022] Preferably, the raw materials of the crystalline particles include the following components: 2.5 to 3.5 parts of infiltrated crystallization material, 73 to 75 parts of 425# cement, and 22 to 24 parts of pure water, by mass; the amount of the organic adhesive added is 10 to 15 wt% of the cement block; and during the screening process, the sieve mesh size is 20 to 80 meshes.

[0023] Preferably, the infiltration crystallization material includes aluminum silicate, magnesium silicate, sodium methyl silicate, and aluminum stearate, and the mass ratio thereof is 1:1~1.2:3~4:1.4~1.6; the organic adhesive includes the following components: 65~80 parts of epoxy resin, 7~15 parts of epoxy diluent, 5~15 parts of latent curing agent, 3~5 parts of silane coupling agent, 1~3 parts of surfactant, and 1~2 parts of deionized water.

[0024] More preferably, the waterproofing roll material comprises, from top to bottom, an active silicon crystalline particle layer, a third modified asphalt adhesive layer, a polymer film layer, a second modified asphalt adhesive layer, a polyester base layer, a first modified asphalt adhesive layer, and a polyester PET film layer.

[0025] Compared with the prior art, the application has the following advantages:

[0026] (1) The polyester base of the application adopts an ultrathin long-fiber reinforced polyester base, and the fibers of the base are bonded by high temperature, without using any chemical or starch adhesive. The fibers of the base have larger gaps, and the surface of the base is roughened, so that the base gum is more easily penetrated, and the tensile strength and waterproof effect are enhanced.

[0027] (2) The active silicon crystalline particle layer of the application adopts a prepared surface active silicon crystalline particle, which contains cement particles containing unstable complex active substances in the inside, and is wrapped with a discontinuous organic coating on the outside. The organic coating can enhance the adhesion of the particles and the modified asphalt gum, and the particles can slowly release unstable complex active substances in water. The complex ions and SiO3 2- , Ca 2+ , Na + , etc. migrate in water, and form sodium silicate hydrate dendritic crystals to continuously repair and compensate for concrete defects, so as to achieve the effect of slow-release self-repairing waterproofing.

[0028] (3) The polyester PET isolation film layer adopts a PET polyester film with higher tensile strength and better peelability than a PE polyethylene film. The lap joint edge is cut by a dotted line and coated with silicon oil PET isolation film, which is more convenient for construction.

[0029] (4) Adding talc to asphalt binder can improve the heat resistance and flexibility of asphalt, and also enhance its viscosity. In the system, talc can act as a nucleating agent, thereby providing additional nucleation sites for the polymer, improving crystallization efficiency, reducing grain size, and achieving a refinement effect; at the same time, nucleation sites help reduce the size of the matrix pores, but also increase the number of pores. In order to improve the uniformity of talcum powder in the system, the present invention first uses a siloxane structure to modify the surface of talcum powder to improve its dispersibility in the matrix. At the same time, the uniformity of talcum powder can better transfer part of the stress when the material is stretched or deformed, thereby enhancing the toughness of the coiled material. The branched double bonds on trivinylmethoxysilane are then polymerized with sodium acrylate to form a branched polymer. The three-dimensional structure of the polymer helps to improve the tensile properties of the asphalt adhesive and further improve the stability of the structure. Finally, hydroxyl silicone oil is grafted to improve the compatibility. Due to its low surface tension, it helps to reduce the formation of pores and reduce the porosity of the matrix. However, if the amount of hydroxyl silicone oil grafted is too much, the pore content in the matrix will be too low, the density will be high, and it will be easily brittle after curing due to external force, resulting in uneven stress distribution and poor seismic performance. By controlling the reaction time and temperature, the modified talcum powder and the loaded hydroxyl silicone oil are within a certain range, and the amount and size of the pores generated are controlled, thereby achieving an asphalt binder that meets the requirements.

[0030] In summary, this invention achieves the same waterproofing effects as both polymer self-adhesive membranes and asphalt-based pre-applied waterproofing membranes, while also offering secondary concrete crack repair capabilities, which these other waterproofing materials lack. Furthermore, by employing a two-layer base composite, it addresses common issues with existing asphalt-based pre-applied waterproofing membranes. The organic combination of a flexible layer and a rigid layer provides long-term self-waterproofing. Furthermore, it enhances the membrane's tensile strength and strengthens its peeling adhesion to subsequent concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : This is a structural layer diagram of a slow-release active self-repairing asphalt-based pre-paved waterproof membrane of the present invention.

[0032] Figure 2 : Schematic diagram of the crystalline particles prepared by the present invention;

[0033] Illustration: active silicon crystalline particle layer 1, third modified asphalt bonding layer 2, polymer film layer 3, second modified asphalt bonding layer 4, polyester tread base layer 5, first modified asphalt bonding layer 6, polyester PET film layer 7. DETAILED DESCRIPTION

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0035] It should be noted that the purchase manufacturers of all raw materials involved in the present invention are not subject to any special restrictions and exemplarily include: ultra-thin long fiber reinforced polyester tire; SBS styrene-butadiene-styrene copolymer; SBR styrene-butadiene rubber; APAO polymer; silane coupling agent; talcum powder; 200# asphalt; 70# asphalt; tetraethyl orthosilicate; trivinylmethoxysilane: CAS: 193828-96-5; epoxy resin; epoxy diluent; latent curing agent; in the following embodiments, parts are by mass and the raw materials are all commercially purchased.

[0036] like Figure 1 As shown, the waterproof roll material comprises, from top to bottom, an active silicon crystalline particle layer 1, a third modified asphalt bonding layer 2, a polymer film layer 3, a second modified asphalt bonding layer 4, a polyester base layer 5, a first modified asphalt bonding layer 6, and a polyester PET film layer 7.

[0037] In each embodiment, the organic adhesive comprises the following components: 70 parts epoxy resin, 12 parts epoxy diluent, 10 parts latent curing agent, 4 parts silane coupling agent, 1.5 parts surfactant, and 1.5 parts deionized water. The osmotic crystallization material comprises aluminum silicate, magnesium silicate, sodium methyl silicate, and aluminum stearate, with a mass ratio of 1:1.1:3.5:1.5.

[0038] In each embodiment, the talc is pre-modified, specifically comprising the following steps:

[0039] (1) 3.5 parts of talc powder were ultrasonically dispersed in 55 parts of 28% ethanol solution, and 11.5 parts of a mixed solution of ethyl orthosilicate and trivinylmethoxysilane (the mass ratio of ethyl orthosilicate and trivinylmethoxysilane was 1:0.6) were gradually added dropwise under high-speed stirring, the pH was adjusted to 3, and the mixture was stirred at 45°C for 35 minutes. The pH was adjusted to 8.5, and the mixture was stirred at 45°C for 1 hour. The mixture was dried at 200°C under a nitrogen atmosphere to obtain olefin-modified talc powder; (2) 12 parts of olefin-modified talc powder were added to 75 parts of deionized water and dispersed uniformly, 7.5 parts of sodium acrylate and 0.1 parts of benzoyl peroxide were added, and the mixture was stirred at 65°C for 3.5 hours. The mixture was filtered, washed, and dried to obtain polymer-modified talc powder; (3) 16 parts of polymer-modified talc powder and 0.5 parts of p-toluenesulfonic acid were added to 22 parts of hydroxy silicone oil, and the mixture was stirred at 75°C for 1.5 hours. The mixture was filtered and dried to obtain modified talc powder.

[0040] Example 1:

[0041] S1: Preparation of polyester tire base: placing an ultra-thin long fiber reinforced polyester tire in silica gel modified asphalt at 180°C and soaking it, then taking it out to obtain a polyester tire base;

[0042] S2: Preparation of modified asphalt binder: 35 parts of 200# asphalt and 25 parts of 70# asphalt were mixed at 175°C and stirred evenly. 5 parts of SBS styrene-butadiene-styrene copolymer, 6 parts of SBR styrene-butadiene rubber, 3.4 parts of APAO polymer, 2 parts of silane coupling agent, 3 parts of magnesium hydroxide, 0.6 parts of nanoclay, and 25 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0043] S3: Preparation of active silicon crystalline particles: 3 parts of the infiltration crystallization active material were mixed with 74 parts of 425# cement and 23 parts of pure water, stirred evenly, poured into a mold and cured to form a cement block; the mixture was crushed using a grinder, passed through a 40-mesh sieve, 12 wt% of an organic adhesive was added, mixed evenly, and fired at 220°C for 5 hours to obtain crystalline particles;

[0044] S4: evenly coating both sides of the polyester base layer with a modified asphalt adhesive to form a first modified asphalt adhesive layer and a second modified asphalt adhesive layer; directly covering the first modified asphalt adhesive layer with a polyester film layer; sequentially arranging a polymer film layer on the second modified asphalt adhesive layer, coating the modified asphalt adhesive to form a third modified asphalt adhesive layer, and evenly laying crystalline particles to form an active silicon crystalline particle layer; drying and cooling to obtain a waterproof membrane.

[0045] Example 2:

[0046] S1: Preparation of polyester tire base: placing an ultra-thin long fiber reinforced polyester tire in silica gel modified asphalt at 175-185°C, and then taking it out to obtain a polyester tire base;

[0047] S2: Preparation of modified asphalt binder: 32 parts of 200# asphalt and 21 parts of 70# asphalt were mixed at 170°C and stirred evenly. 3 parts of SBS styrene-butadiene-styrene copolymer, 3 parts of SBR styrene-butadiene rubber, 4 parts of APAO polymer, 1 part of silane coupling agent, 3 parts of magnesium hydroxide, 0.5 parts of nanoclay, and 26 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0048] S3: Preparation of active silicon crystalline particles: 2.5 parts of the osmotic crystallization active material were mixed with 73 parts of 425# cement and 20 parts of pure water, stirred evenly, poured into a mold and cured to form a cement block; the mixture was crushed using a grinder, passed through a 40-mesh sieve, 10 wt% of an organic adhesive was added, mixed evenly, and fired at 220°C for 5 hours to obtain crystalline particles;

[0049] S4: evenly coating both sides of the polyester base layer with a modified asphalt adhesive to form a first modified asphalt adhesive layer and a second modified asphalt adhesive layer; directly covering the first modified asphalt adhesive layer with a polyester film layer; sequentially arranging a polymer film layer on the second modified asphalt adhesive layer, coating the modified asphalt adhesive to form a third modified asphalt adhesive layer, and evenly laying crystalline particles to form an active silicon crystalline particle layer; drying and cooling to obtain a waterproof membrane.

[0050] Example 3:

[0051] S1: Preparation of polyester tire base: placing an ultra-thin long fiber reinforced polyester tire in silica gel modified asphalt at 175-185°C, and then taking it out to obtain a polyester tire base;

[0052] S2: Preparation of modified asphalt binder: 41 parts of 200# asphalt and 33 parts of 70# asphalt were mixed at 175°C and stirred evenly. 8 parts of SBS styrene-butadiene-styrene copolymer, 8 parts of SBR styrene-butadiene rubber, 5 parts of APAO polymer, 3 parts of silane coupling agent, 5 parts of magnesium hydroxide, 1.2 parts of nanoclay, and 30 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0053] S3: Preparation of active silicon crystalline particles: 3.5 parts of the osmotic crystallization active material were mixed with 75 parts of 425# cement and 25 parts of pure water, stirred evenly, poured into a mold and cured to form a cement block; the mixture was crushed using a grinder, passed through a 40-mesh sieve, 15 wt% of an organic adhesive was added, mixed evenly, and fired at 220°C for 5 hours to obtain crystalline particles;

[0054] S4: evenly coating both sides of the polyester base layer with a modified asphalt adhesive to form a first modified asphalt adhesive layer and a second modified asphalt adhesive layer; directly covering the first modified asphalt adhesive layer with a polyester film layer; sequentially arranging a polymer film layer on the second modified asphalt adhesive layer, coating the modified asphalt adhesive to form a third modified asphalt adhesive layer, and evenly laying crystalline particles to form an active silicon crystalline particle layer; drying and cooling to obtain a waterproof membrane.

[0055] Comparative Example 1: Based on Example 1, a polyester base layer was prepared using a short-fiber polyester tire, and the rest of the process remained unchanged, as follows:

[0056] S1: Preparation of polyester tire base: placing a short-fiber polyester tire in a silica-modified asphalt at 180° C. and soaking it, and then taking it out to obtain a polyester tire base;

[0057] S2: Preparation of modified asphalt binder: 35 parts of 200# asphalt and 25 parts of 70# asphalt were mixed at 175°C and stirred evenly. 5 parts of SBS styrene-butadiene-styrene copolymer, 6 parts of SBR styrene-butadiene rubber, 3.4 parts of APAO polymer, 2 parts of silane coupling agent, 3 parts of magnesium hydroxide, 0.6 parts of nanoclay, and 25 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0058] S3: Preparation of active silicon crystalline particles: 3 parts of the infiltration crystallization active material were mixed with 74 parts of 425# cement and 23 parts of pure water, stirred evenly, poured into a mold and cured to form a cement block; the mixture was crushed using a grinder, passed through a 40-mesh sieve, 12 wt% of an organic adhesive was added, mixed evenly, and fired at 220°C for 5 hours to obtain crystalline particles;

[0059] S4: evenly coating both sides of the polyester base layer with a modified asphalt adhesive to form a first modified asphalt adhesive layer and a second modified asphalt adhesive layer; directly covering the first modified asphalt adhesive layer with a polyester film layer; sequentially arranging a polymer film layer on the second modified asphalt adhesive layer, coating the modified asphalt adhesive to form a third modified asphalt adhesive layer, and evenly laying crystalline particles to form an active silicon crystalline particle layer; drying and cooling to obtain a waterproof membrane.

[0060] Comparative Example 2: Based on Example 1, no organic adhesive was added during the preparation of the crystalline particles, and the remaining processes remained unchanged, as follows:

[0061] S1: Preparation of polyester tire base: placing an ultra-thin long fiber reinforced polyester tire in silica gel modified asphalt at 180°C and soaking it, then taking it out to obtain a polyester tire base;

[0062] S2: Preparation of modified asphalt binder: 35 parts of 200# asphalt and 25 parts of 70# asphalt were mixed at 175°C and stirred evenly. 5 parts of SBS styrene-butadiene-styrene copolymer, 6 parts of SBR styrene-butadiene rubber, 3.4 parts of APAO polymer, 2 parts of silane coupling agent, 3 parts of magnesium hydroxide, 0.6 parts of nanoclay, and 25 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0063] S3: Preparation of active silicon crystalline particles: 3 parts of osmotic crystallization active material were mixed with 74 parts of 425# cement and 23 parts of pure water, stirred evenly, poured into a mold and cured to form cement blocks; the mixture was crushed in a grinder and passed through a 40-mesh sieve to obtain crystalline particles;

[0064] S4: uniformly coat the two sides of the polyester base layer with modified asphalt binder to form a first modified asphalt bonding layer and a second modified asphalt bonding layer; directly cover a polyester PET film layer on the first modified asphalt bonding layer; sequentially arrange a polymer film layer, coat modified asphalt binder to form a third modified asphalt bonding layer, and uniformly lay crystalline particles to form an active silicon crystalline particle layer on the second modified asphalt bonding layer; dry and cool to obtain a waterproof roll material.

[0065] Comparative Example 3: based on Example 1, the talc powder is not modified, and the rest of the process remains unchanged, as follows:

[0066] S1: Preparation of the polyester base layer: immerse the ultra-thin long-fiber reinforced polyester base in silicon gel modified asphalt at 180°C, take it out, and obtain the polyester base layer;

[0067] S2: Preparation of the modified asphalt binder: mix 35 parts of 200# asphalt and 25 parts of 70# asphalt at 175°C, then uniformly stir, add 5 parts of SBS styrene-butadiene-styrene copolymer, 6 parts of SBR styrene-butadiene rubber, 3.4 parts of APAO polymer, 2 parts of silane coupling agent, 3 parts of magnesium hydroxide, 0.6 parts of nano clay, and 25 parts of talc powder, high-speed stirring and dispersion for 1 h, heat preservation at 150°C, and discharge to the oil coating pool through a colloid mill to obtain the modified asphalt binder;

[0068] S3: Preparation of the active silicon crystalline particle: mix 3 parts of permeable crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir uniformly, pour into a mold, and cure to form a cement block; crush through a pulverizer, pass through a 40-mesh sieve, add 12 wt% of organic adhesive, mix uniformly, and bake at 220°C for 5 h to obtain the crystalline particle;

[0069] S4: uniformly coat the two sides of the polyester base layer with modified asphalt binder to form a first modified asphalt bonding layer and a second modified asphalt bonding layer; directly cover a polyester PET film layer on the first modified asphalt bonding layer; sequentially arrange a polymer film layer, coat modified asphalt binder to form a third modified asphalt bonding layer, and uniformly lay crystalline particles to form an active silicon crystalline particle layer on the second modified asphalt bonding layer; dry and cool to obtain a waterproof roll material.

[0070] Comparative Example 4: based on Example 1, increase the reaction time when the talc powder is modified with hydroxyl silicone oil, and the rest of the process remains unchanged, as follows:

[0071] S1: Preparation of the polyester base layer: immerse the ultra-thin long-fiber reinforced polyester base in silicon gel modified asphalt at 180°C, take it out, and obtain the polyester base layer;

[0072] S2: Preparation of modified asphalt binder: 35 parts of 200# asphalt and 25 parts of 70# asphalt were mixed at 175°C and stirred evenly. 5 parts of SBS styrene-butadiene-styrene copolymer, 6 parts of SBR styrene-butadiene rubber, 3.4 parts of APAO polymer, 2 parts of silane coupling agent, 3 parts of magnesium hydroxide, 0.6 parts of nanoclay, and 25 parts of talc were added. The mixture was stirred and dispersed at high speed for 1 hour. The mixture was kept at 150°C and discharged into an oiling tank through a colloid mill to obtain a modified asphalt binder.

[0073] S3: Preparation of active silicon crystalline particles: 3 parts of the infiltration crystallization active material were mixed with 74 parts of 425# cement and 23 parts of pure water, stirred evenly, poured into a mold and cured to form a cement block; the mixture was crushed using a grinder, passed through a 40-mesh sieve, 12 wt% of an organic adhesive was added, mixed evenly, and fired at 220°C for 5 hours to obtain crystalline particles;

[0074] S4: evenly coating both sides of the polyester base layer with a modified asphalt adhesive to form a first modified asphalt adhesive layer and a second modified asphalt adhesive layer; directly covering the first modified asphalt adhesive layer with a polyester film layer; sequentially arranging a polymer film layer on the second modified asphalt adhesive layer, coating the modified asphalt adhesive to form a third modified asphalt adhesive layer, and evenly laying crystalline particles to form an active silicon crystalline particle layer; drying and cooling to obtain a waterproof membrane.

[0075] Among them, in Comparative Example 4, the preparation method of modified talc powder comprises the following steps:

[0076] (1) 3.5 parts of talc powder were ultrasonically dispersed in 55 parts of 28% ethanol solution, and 11.5 parts of a mixed solution of ethyl orthosilicate and trivinylmethoxysilane (the mass ratio of ethyl orthosilicate and trivinylmethoxysilane was 1:0.6) were gradually added dropwise under high-speed stirring, the pH was adjusted to 3, and the mixture was stirred at 45°C for 35 minutes. The pH was adjusted to 8.5, and the mixture was stirred at 45°C for 1 hour. The mixture was dried at 200°C under a nitrogen atmosphere to obtain olefin-modified talc powder; (2) 12 parts of olefin-modified talc powder were added to 75 parts of deionized water and dispersed uniformly, 7.5 parts of sodium acrylate and 0.1 parts of benzoyl peroxide were added, and the mixture was stirred at 65°C for 3.5 hours. The mixture was filtered, washed, and dried to obtain polymer-modified talc powder; (3) 16 parts of polymer-modified talc powder and 0.5 parts of p-toluenesulfonic acid were added to 22 parts of hydroxy silicone oil, and the mixture was stirred at 75°C for 4 hours. The mixture was filtered and dried to obtain modified talc powder.

[0077] Performance test (1): The physical and mechanical properties of the product of Example 1 were tested in accordance with the standard GB / T23457-2017 "Pre-laid waterproof membrane". The experimental data are shown in Table 1.

[0078] Table 1

[0079]

[0080] Through research and development tests, the present invention obtained Example 1 with the best performance. As shown in Table 1, the physical properties of the asphalt-based pre-laid waterproof membrane prepared in Example 1 of the present invention meet the requirements of the standard, so Example 1 and other comparative examples were subjected to performance tests.

[0081] Performance test (2): According to the standard GB / T 23457-2017 "Pre-laid waterproof membrane", the tensile force and stretching phenomena of each comparative example were tested and compared with Example 1. The experimental data are shown in Table 1.

[0082] Table 2

[0083]

[0084] As shown in Table 2, in Comparative Example 1, a polyester tire base layer was prepared using a short-fiber polyester tire, which was difficult for the tire base glue to penetrate and the tensile strength was reduced. In Comparative Example 2, no organic adhesive was added during the preparation of the crystalline particles, resulting in poor bonding with the asphalt binder and easy separation. In Comparative Example 3, talc was not modified, resulting in poor dispersibility and reduced tensile strength. In Comparative Example 4, the reaction time was increased when modifying talc with hydroxylated silicone oil, which increased the hydroxylated silicone oil loading, resulted in excessive density, and reduced tensile strength.

[0085] Performance test (3): The coiled material sample of Example 1 was taken and subjected to a chloride ion penetration resistance test according to the standard JTS153-2015 "Durability Design Standard for Water Transport Engineering Structures". The experimental data are shown in Table 3.

[0086] Table 3

[0087] project <![CDATA[抗氯离子渗透性 / (mg / cm 2 .d)]]> Example 1 0.0014

[0088] As shown in Table 3, the asphalt-based waterproof membrane prepared by the present invention has a chloride ion permeability of ≤0.005 mg / cm 2 .d, which is more than 20 times that of ordinary asphalt-based waterproof membranes. It can effectively protect the main structure of the building from erosion by corrosive media and extend the service life of the building.

[0089] Performance test (4): The coiled material sample of Example 1 was taken to prepare a concrete anti-seepage performance test piece with coating. The anti-seepage pressure (28 days) and the second anti-seepage pressure (56 days) performance test of the coated concrete were carried out in accordance with the standard GB 18445-2012 "Cement-based permeable crystalline waterproof material". The experimental data are shown in Table 4.

[0090] Specimen Preparation: Place a cut, 175mm diameter waterproof sheet into a mold as the backing material. Pour concrete directly onto the surface layer. Forming is done in two layers, using manual tamping. The surface is scraped flat with an iron plate and placed in a standard curing room. After standing for 1 day, the specimen is removed from the mold. The specimen is then immersed in water to a depth of three-quarters of its height for curing at a temperature of 20±2°C and a relative humidity greater than 95%. Remove the specimen after curing to the desired age. Peel off the self-adhesive surface of the specimen (adhered to the concrete surface, no polishing is required). Wipe the specimen clean and air dry before testing.

[0091] Table 4

[0092]

[0093] As can be seen from Table 4, the asphalt-based waterproof membrane prepared by the present invention can repair concrete microcracks, has a slow-release self-repairing function, and forms a double waterproof layer with a secondary anti-seepage function, which is mainly suitable for underground engineering waterproofing.

[0094] In summary, the present invention successfully provides a slow-release self-repairing asphalt-based pre-laid waterproof membrane by adopting a polyester base layer prepared with ultra-thin long fiber reinforced polyester, an active silicon crystalline particle layer with self-repairing function, and a modified asphalt binder. It also has the characteristics of good tensile strength and high interlayer bonding strength.

[0095] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a slow-release self-repairing asphalt-based pre-paved waterproof membrane, characterized by: The following steps are involved: S1: placing an ultra-thin long fiber reinforced polyester tire in a silica gel modified asphalt and soaking it, taking it out to obtain a polyester tire base layer (5); S2: Heat and stir 200# asphalt and 70# asphalt evenly; then add SBS styrene-butadiene-styrene copolymer, SBR styrene-butadiene rubber, APAO polymer, silane coupling agent, magnesium hydroxide and nanoclay in sequence; fully melt and disperse; add talc powder and stir and disperse at high speed; and grind the material through colloid mill to obtain modified asphalt binder; S3: adding the infiltrated crystallization material and cement to pure water in sequence, stirring evenly, curing and forming, crushing, screening, and obtaining particles; mixing the infiltrated crystallization material and the cement with an organic adhesive, and then firing the mixture at 200-240° C. for 4-8 hours to obtain crystal particles; S4: uniformly coating both sides of the polyester tread base layer (5) with a modified asphalt binder to form a first modified asphalt bonding layer (6) and a second modified asphalt bonding layer (4); directly covering the first modified asphalt bonding layer (6) with a polyester film layer (7); sequentially providing a polymer film layer (3) on the second modified asphalt bonding layer (4), coating the modified asphalt binder to form a third modified asphalt bonding layer (2), and uniformly paving crystal particles to form an active silicon crystal particle layer (1); Drying and cooling to obtain waterproof membrane; The talc powder is pre-modified to obtain the modified talc powder, which is then added to the modified asphalt binder. The preparation method of the modified talc powder comprises the following steps: (1) ultrasonically dispersing talc in a 28-30% ethanol solution, gradually adding a mixed solution of ethyl orthosilicate and trivinylmethoxysilane in a mass ratio of 1:0.5-0.7 under high-speed stirring, adjusting the pH to 3-3.5, stirring at 40-45°C for 30-40 minutes, adjusting the pH to 8-9, stirring at 40-50°C for 1-1.5 hours, and drying at 180-200°C under a nitrogen atmosphere to obtain olefin-modified talc; (2) adding olefin modified talc powder to deionized water and ultrasonically dispersing the mixture uniformly, adding sodium acrylate and benzoyl peroxide, stirring the mixture at 60-70° C. for 3-4 hours, filtering, washing, and drying the mixture to obtain polymer modified talc powder; (3) adding polymer-modified talc and p-toluenesulfonic acid to hydroxy silicone oil, stirring at 70-80° C. for 1.5-2 h, filtering, and drying to obtain modified talc; Wherein, the infiltration crystallization material includes aluminum silicate, magnesium silicate, sodium methyl silicate and aluminum stearate, and the mass ratio thereof is 1:1-1.2:3-4:1.4-1.

6.

2. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproof membrane according to claim 1, characterized in that: In S1, the silicone modified asphalt is obtained by mixing 70# asphalt and SMA silicone rubber modified asphalt in a mass ratio of 1:1; the penetration temperature is 175-185°C.

3. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproofing membrane according to claim 1, characterized in that: The raw materials of the modified asphalt binder include the following components: by mass, 32 to 41 parts of 200# asphalt, 21 to 33 parts of 70# asphalt, 3 to 8 parts of SBS styrene-butadiene-styrene copolymer, 3 to 8 parts of SBR styrene-butadiene rubber, 3 to 4 parts of APAO polymer, 1 to 3 parts of silane coupling agent, 3 to 5 parts of magnesium hydroxide, 0.5 to 1.2 parts of nano clay and 26 to 30 parts of talc.

4. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproofing membrane according to claim 1, characterized in that: In S2, the temperature for uniform heating and stirring is 170-180°C; the temperature for sufficient melting and dispersion is 170-180°C, and the time is 1.5-2h; the temperature for high-speed stirring and dispersion is 140-160°C, and the time is 1-2h.

5. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproofing membrane according to claim 1, characterized in that: The alkenyl modified talc powder comprises the following raw materials in parts by weight: 3 to 4 parts of talc powder, 50 to 60 parts of ethanol solution, and 9 to 12 parts of a mixed solution of ethyl orthosilicate and trivinylmethoxysilane; The polymer-modified talc powder comprises the following raw materials in parts by weight: 70 to 80 parts of deionized water, 7 to 8 parts of sodium acrylate and 0.1 to 0.2 parts of benzoyl peroxide; The modified talc powder comprises the following raw materials in parts by mass: 15 to 17 parts of polymer-modified talc powder, 0.5 to 1 part of p-toluenesulfonic acid and 20 to 25 parts of hydroxy silicone oil.

6. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproofing membrane according to claim 1, characterized in that: The raw materials of the crystallized particles include the following components: 2.5 to 3.5 parts of osmotic crystallization material, 73 to 75 parts of 425# cement and 22 to 24 parts of pure water, calculated by mass. The amount of the organic adhesive added is 10-15 wt% of the cement block; During the screening process, the sieving mesh number is 20 to 80 meshes.

7. The method for preparing a slow-release self-repairing asphalt-based pre-paved waterproofing membrane according to claim 1, characterized in that: The organic adhesive comprises the following components: 65-80 parts of epoxy resin, 7-15 parts of epoxy diluent, 5-15 parts of latent curing agent, 3-5 parts of silane coupling agent, 1-3 parts of surfactant and 1-2 parts of deionized water.

8. The waterproof membrane prepared by the method for preparing a slow-release self-repairing asphalt-based pre-laid waterproof membrane according to any one of claims 1 to 7, characterized in that: The waterproof roll material comprises, from top to bottom, an active silicon crystalline particle layer (1), a third modified asphalt bonding layer (2), a polymer film layer (3), a second modified asphalt bonding layer (4), a polyester base layer (5), a first modified asphalt bonding layer (6), and a polyester PET film layer (7).

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