Slow-release self-repairing asphalt-based pre-paved waterproof coiled material and preparation method thereof

Abstract

The invention discloses a slow-release self-repairing asphalt-based pre-paved 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 two surfaces of the polyester base layer with a modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; directly covering a polyester PET film layer on the first modified asphalt binder layer; sequentially arranging a polymeric membrane layer on the second modified asphalt bonding layer, coating a modified asphalt bonding agent to form a third modified asphalt bonding layer, and uniformly laying crystal particles to form an active silicon crystal particle layer; the asphalt-based pre-paved waterproof coiled material prepared by the preparation method disclosed by the invention can be self-repaired and waterproof, and has good tensile property.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof coiled material preparation, and particularly to a slow-release self-repairing asphalt-based pre-laid waterproof coiled material and a preparation method thereof. Background Technique

[0002] With the gradual expansion and wide application of the underground pre-laid and self-adhered technology, the commonly seen pre-laid materials in the market are polymer self-adhesive film waterproof coiled materials. However, with the in-depth construction of polymer self-adhesive film waterproof coiled materials, many problems have emerged, such as poor conformability of the coiled material's polymer self-adhesive film, difficult lap joint construction between the bottom plate and the side wall waterproof layer, and it is very difficult to lay flat and firm in parts such as the inner and outer corners. Moreover, the large surface lap joints of the coiled material mostly adopt self-adhesive laps, and the peel strength is extremely susceptible to temperature influence. Especially during construction in low-temperature environments, the bonding effect is poor, bringing certain difficulties and challenges to the construction.

[0003] Based on this drawback, the commonly used polyester tire-based pre-laid waterproof coiled materials in the market generally use polyester tire as the carcass, modified asphalt binder as the coating material, and sintered isolation sand on the surface, and are made into sheet-shaped waterproof coiled materials through roll extrusion. Due to their good waterproof, corrosion-resistant, and construction convenience properties, they are widely used in the underground waterproof projects of industrial and civil buildings.

[0004] Currently, due to production process and formulation problems of the commonly available polyester tire pre-laid waterproof coiled materials in the market, problems such as modification with recycled rubber powder, too thick carcass, and mismatched process parameters result in insufficient fineness of the modified asphalt binder, obvious granularity, poor carcass density, and when observed under magnification, there are many pores and pits in the asphalt binder, leading to low peel strength of the coiled material, easy loosening of the lap joints after construction, and extremely easy occurrence of problems such as water channeling, water seepage, and blistering. At the same time, due to the poor stability of the asphalt binder modified with recycled rubber powder, recycled resin particles, etc., the service life of the coiled material is seriously affected.

[0005] Meanwhile, to improve the waterproof effect, two layers of waterproofing are required for underground pre-laid waterproof construction to meet the first-level waterproof requirement, and the requirement of two-layer waterproof composite construction for pre-laid coiled materials has become a difficult problem. In the prior art, commonly, other coatings are selected to be applied on the cushion layer and bonded with the pre-laid coiled material composite coating on the cushion layer, but the cracking and damage of the cushion layer will damage the waterproof layer; there is also the method of dry-sprinkling penetrative crystalline waterproof coating on the pre-laid coiled material. This method has better economy, but there will be problems of pollution and unevenness in on-site construction, and it is difficult to achieve good results.

[0006] In summary, to solve the above problems, it is of great significance to provide a slow-release active self-repairing asphalt-based pre-laid waterproof coiled material 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-laid waterproof coiled material and a preparation method thereof to solve the problems raised in the prior art.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane: including the following steps:

[0010] S1: Immerse an ultra-thin long-fiber reinforced polyester carcass in silica gel modified asphalt, take it out, and obtain a polyester carcass base layer;

[0011] S2: Heat and stir 200# asphalt and 70# asphalt evenly; then sequentially add SBS styrene-butadiene-styrene copolymer, SBR styrene-butadiene rubber, APAO polymer, silane coupling agent, magnesium hydroxide, nano-clay; fully melt and disperse; add talcum powder and stir at high speed for dispersion; discharge through a colloid mill to obtain a modified asphalt binder;

[0012] S3: Sequentially add a penetrant crystalline substance and cement to pure water, stir evenly, cure and form, crush and screen to obtain particles; mix them evenly with an organic adhesive and calcine at 200-240°C for 4-8 hours to obtain crystalline particles;

[0013] S4: Uniformly coat both sides of the polyester carcass base layer with the modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; directly cover a polyester PET film layer on the first modified asphalt binder layer; sequentially arrange a polymer film layer, coat the modified asphalt binder to form a third modified asphalt binder layer, and uniformly lay crystalline particles to form an active silicon crystalline particle layer on the second modified asphalt binder layer; dry and cool to obtain a waterproofing membrane.

[0014] Among them, in S1, the silica gel modified asphalt is obtained by mixing 70# asphalt and SMA silicone rubber modified asphalt with a mass ratio of 1:1; the immersion temperature is 175-185°C.

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

[0016] Among them, in S2, the temperature for heating and stirring evenly is 170-180°C; the temperature for fully melting and dispersing is 170-180°C, and the time is 1.5-2h; the temperature for high-speed stirring and dispersing is 140-160°C, and the time is 1-2h.

[0017] More preferably, the talcum powder is pre-modified to obtain modified talcum powder and then added to the modified asphalt binder; the preparation method of the modified talcum powder includes the following steps:

[0018] (1) Ultrasonically disperse the talcum powder in a 28-30% ethanol solution. Under high-speed stirring, gradually dropwise add a mixed solution of tetraethyl orthosilicate and vinyltrimethoxysilane with a mass ratio of 1:0.5-0.7, adjust the pH to 3-3.5, stir at 40-45°C for 30-40 min, adjust the pH to 8-9, stir at 40-50°C for 1-1.5 h, and dry at 180-200°C under a nitrogen atmosphere to obtain vinyl-modified talcum powder;

[0019] (2) Add the vinyl-modified talcum powder to deionized water and ultrasonically disperse it evenly. Add sodium acrylate and benzoyl peroxide, stir at 60-70°C for 3-4 h, filter, wash, and dry to obtain polymer-modified talcum powder;

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

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

[0022] More preferably, the raw materials of the crystal grains include the following components: in parts by mass, 2.5-3.5 parts of permeable crystal substance, 73-75 parts of 425# cement, 22-24 parts of pure water; the addition amount of the organic adhesive is 10-15 wt% of the cement block; during the screening process, the screening mesh size is 20-80 meshes.

[0023] More preferably, the permeable crystal substance includes aluminum silicate, magnesium silicate, sodium methyl silicate, and aluminum stearate, and their mass ratio 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, 1-2 parts of deionized water.

[0024] More preferably, the waterproof coiled material from top to bottom is sequentially an active silicon crystal particle layer, a third modified asphalt bonding layer, a polymer film layer, a second modified asphalt bonding layer, a polyester tire base layer, a first modified asphalt binder layer, and a polyester PET film layer.

[0025] Compared with the prior art, the beneficial effects of the present application are as follows:

[0026] (1) The polyester tire base used in the present invention adopts an ultra-thin long fiber reinforced polyester tire base. The tire base fibers are thermally bonded at high temperature without using any chemical or starch adhesives. There are larger gaps between the tire base fibers, and at the same time, the surface of the tire base is roughened, which is more conducive to the penetration of the tire base glue, enhancing its tensile strength and waterproof effect.

[0027] (2) The active silicon crystal particle layer of the present invention uses prepared surface active silicon crystal particles: its internal contains cement particles with complex active substances with unstable penetration crystallization, and the outer surface is wrapped with a discontinuous organic coating. The organic coating can enhance the adhesion between the particles and the modified asphalt binder. At the same time, the particles can slowly release unstable complex active substances in water. The complex ions and SiO3 2- , Ca 2+ , Na + and the like migrate in water and form dendritic crystals of sodium silicate hydrate for continuous repair, making up for the defects of concrete to achieve the waterproof effect of slow release and self-repair.

[0028] (3) The PET polyester film used in the polyester PET isolation film layer has greater tensile strength and better peelability than the PE polyethylene film. The overlapping edge uses a dotted line cut and silicone oil-coated PET isolation film, making the construction more convenient.

[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 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. Then, the branched structure double bonds on trivinylmethoxysilane are polymerized with sodium acrylate to form a branched polymer, and its three-dimensional structure 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. The stress distribution is uneven and the seismic performance is poor. 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 are controlled, thereby achieving an asphalt binder that meets the requirements.

[0030] In summary, the present invention can not only achieve the same waterproof effect as the polymer self-adhesive film and the asphalt-based pre-laid waterproofing membrane, but also has the performance of secondary repair of concrete cracks that these two waterproof materials do not have. At the same time, the two-layer base composite solves the common problems of the current asphalt-based pre-laid waterproofing membrane. On the one hand, a layer of flexible and a layer of rigid waterproof materials are organically combined to truly achieve long-term self-waterproofing. On the other hand, the tensile strength of the membrane is improved, and the peeling adhesion with the post-cast concrete is enhanced. 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 adhesive 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 the field without making any creative work shall fall within the scope of protection of the present invention.

[0035] It should be noted that there are no special restrictions on the purchasing manufacturers of all raw materials involved in the present invention. Exemplarily, they 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 examples, parts are parts by mass, and the raw materials are all commercially available.

[0036] As Figure 1 shown, the waterproof coiled material from top to bottom is sequentially an active silicon crystal grain layer 1, a third modified asphalt bonding layer 2, a polymer film layer 3, a second modified asphalt bonding layer 4, a polyester tire base layer 5, a first modified asphalt binder layer 6, and a polyester PET film layer 7.

[0037] Among them, in each example, the organic adhesive includes the following components: 70 parts of epoxy resin, 12 parts of epoxy diluent, 10 parts of latent curing agent, 4 parts of silane coupling agent, 1.5 parts of surfactant, 1.5 parts of deionized water; the penetration crystallization substance includes aluminum silicate, magnesium silicate, sodium methyl silicate, and aluminum stearate, and their mass ratio is 1:1.1:3.5:1.5.

[0038] Among them, in each example, the talcum powder is pre-modified, specifically including the following steps:

[0039] (1) Ultrasonically disperse 3.5 parts of talcum powder in 55 parts of an ethanol solution with a mass fraction of 28%. Under high-speed stirring, gradually dropwise add a mixed solution of 11.5 parts of tetraethyl orthosilicate and trivinylmethoxysilane (the mass ratio of tetraethyl orthosilicate to trivinylmethoxysilane is 1:0.6), adjust the pH to 3, stir at 45°C for 35 min, adjust the pH to 8.5, stir at 45°C for 1 h, and dry at 200°C under a nitrogen atmosphere to obtain vinylated modified talcum powder; (2) Add 12 parts of vinylated modified talcum powder to 75 parts of deionized water and disperse evenly. Add 7.5 parts of sodium acrylate and 0.1 part of benzoyl peroxide, stir at 65°C for 3.5 h, filter, wash, and dry to obtain polymer-modified talcum powder; (3) Add 16 parts of polymer-modified talcum powder and 0.5 part of p-toluenesulfonic acid to 22 parts of hydroxy silicone oil, stir at 75°C for 1.5 h, filter, and dry to obtain modified talcum powder.

[0040] Example 1:

[0041] S1: Preparation of the polyester tire base layer: Place the ultra-thin long fiber reinforced polyester tire in silicone-modified asphalt and soak it at 180°C, then take it out to obtain the polyester tire base layer;

[0042] S2: Preparation of modified asphalt binder: Mix 35 parts of 200# asphalt and 25 parts of 70# asphalt at 175°C and stir evenly. Then 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 part of nano-clay, and 25 parts of talc powder. Stir and disperse at high speed for 1 h, keep warm at 150°C, and discharge through a colloid mill into an oil coating pool to obtain the modified asphalt binder;

[0043] S3: Preparation of active silicon crystal particles: Mix 3 parts of permeable crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; Crush it through a crusher, pass through a 40-mesh sieve, add 12 wt% of organic adhesive, mix evenly, and bake at 220°C for 5 h to obtain crystal particles;

[0044] S4: Uniformly coat both sides of the polyester tire base with the modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; Directly cover a polyester PET film layer on the first modified asphalt binder layer; Sequentially set a polymer film layer, coat with the modified asphalt binder to form a third modified asphalt binder layer, and uniformly lay crystal particles to form an active silicon crystal particle layer on the second modified asphalt binder layer; Dry and cool to obtain a waterproof coiled material.

[0045] Example 2:

[0046] S1: Preparation of polyester tire base: Immerse an ultra-thin long fiber reinforced polyester tire in silicone-modified asphalt at 175 - 185°C, take it out to obtain the polyester tire base;

[0047] S2: Preparation of modified asphalt binder: Mix 32 parts of 200# asphalt and 21 parts of 70# asphalt at 170°C and stir evenly. Then add 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 part of nano-clay, and 26 parts of talc powder. Stir and disperse at high speed for 1 h, keep warm at 150°C, and discharge through a colloid mill into an oil coating pool to obtain the modified asphalt binder;

[0048] S3: Preparation of active silicon crystal particles: Mix 2.5 parts of permeable crystalline active substance with 73 parts of 425# cement and 20 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; Crush it through a crusher, pass through a 40-mesh sieve, add 10 wt% of organic adhesive, mix evenly, and bake at 220°C for 5 h to obtain crystal particles;

[0049] S4: Uniformly coat both sides of the polyester tire base layer with a modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; directly cover a polyester PET film layer on the first modified asphalt binder layer; sequentially arrange a polymer film layer on the second modified asphalt binder layer, coat with a modified asphalt binder to form a third modified asphalt binder layer, and uniformly lay crystalline particles to form an active silicon crystalline particle layer; dry and cool to obtain a waterproof coiled material.

[0050] Example 3:

[0051] S1: Preparation of the polyester tire base layer: Place the ultra-thin long-fiber reinforced polyester tire in silicone-modified asphalt and soak it at 175 - 185 °C, then take it out to obtain the polyester tire base layer;

[0052] S2: Preparation of the modified asphalt binder: Mix 41 parts of 200# asphalt and 33 parts of 70# asphalt at 175 °C and stir evenly, then add 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 nano-clay, and 30 parts of talcum powder, stir and disperse at high speed for 1 h, keep warm at 150 °C, and discharge to the oil coating tank through a colloid mill to obtain the modified asphalt binder;

[0053] S3: Preparation of the active silicon crystalline particles: Mix 3.5 parts of permeable crystalline active substance with 75 parts of 425# cement and 25 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; crush it through a crusher, sieve it through a 40-mesh sieve, add 15 wt% of organic adhesive, mix evenly, and bake at 220 °C for 5 h to obtain the crystalline particles;

[0054] S4: Uniformly coat both sides of the polyester tire base layer with a modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; directly cover a polyester PET film layer on the first modified asphalt binder layer; sequentially arrange a polymer film layer on the second modified asphalt binder layer, coat with a modified asphalt binder to form a third modified asphalt binder layer, and uniformly lay crystalline particles to form an active silicon crystalline particle layer; dry and cool to obtain a waterproof coiled material.

[0055] Comparative Example 1: Based on Example 1, use a short-fiber polyester tire to prepare the polyester tire base layer, and the rest of the process remains unchanged. The details are as follows:

[0056] S1: Preparation of the polyester tire base layer: Place the short-fiber polyester tire in silicone-modified asphalt and soak it at 180 °C, then take it out to obtain the polyester tire base layer;

[0057] S2: Preparation of modified asphalt binder: Mix 35 parts of 200# asphalt and 25 parts of 70# asphalt at 175°C and stir evenly. Then 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 part of nano-clay, and 25 parts of talc powder. Stir and disperse at high speed for 1 h, keep warm at 150°C, and discharge through a colloid mill into an oil coating tank to obtain the modified asphalt binder;

[0058] S3: Preparation of active silicon crystal particles: Mix 3 parts of permeable crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; Crush it through a crusher, pass through a 40-mesh sieve, add 12 wt% of organic adhesive, mix evenly, and bake at 220°C for 5 h to obtain the crystal particles;

[0059] S4: Uniformly coat both sides of the polyester tire base with the modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; Directly cover a polyester PET film layer on the first modified asphalt binder layer; Sequentially set a polymer film layer on the second modified asphalt binder layer, coat with the modified asphalt binder to form a third modified asphalt binder layer, and uniformly lay the crystal particles to form an active silicon crystal particle layer; Dry and cool to obtain the waterproof coiled material.

[0060] Comparative Example 2: Based on Example 1, no organic adhesive is added during the preparation process of the crystal particles, and the rest of the processes remain unchanged. Specifically as follows:

[0061] S1: Preparation of the polyester tire base: Immerse the ultra-thin long fiber reinforced polyester tire in silicone-modified asphalt at 180°C, take it out to obtain the polyester tire base;

[0062] S2: Preparation of modified asphalt binder: Mix 35 parts of 200# asphalt and 25 parts of 70# asphalt at 175°C and stir evenly. Then 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 part of nano-clay, and 25 parts of talc powder. Stir and disperse at high speed for 1 h, keep warm at 150°C, and discharge through a colloid mill into an oil coating tank to obtain the modified asphalt binder;

[0063] S3: Preparation of active silicon crystal particles: Mix 3 parts of permeable crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; Crush it through a crusher, pass through a 40-mesh sieve to obtain the crystal particles;

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

[0065] Comparative Example 3: Based on Example 1, the talcum powder is not modified, and the rest of the process remains unchanged. The details are as follows:

[0066] S1: Preparation of the polyester tire base layer: Place the ultra-thin long fiber reinforced polyester tire in silicone modified asphalt and soak it at 180°C, then take it out to obtain the polyester tire 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 and stir evenly, then 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 part of nano-clay, and 25 parts of talcum powder, and disperse them by high-speed stirring for 1 h, keep them at 150°C for heat preservation, and discharge them into the oil coating pool through a colloid mill to obtain the modified asphalt binder;

[0068] S3: Preparation of the active silicon crystalline particles: Mix 3 parts of penetrant crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir evenly, pour them into a mold for curing and forming to obtain a cement block; crush it through a crusher, pass through a 40-mesh sieve, add 12 wt% of organic adhesive, mix evenly, and calcine at 220°C for 5 h to obtain the crystalline particles;

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

[0070] Comparative Example 4: Based on Example 1, increase the reaction time during the hydroxylation silicone oil modification of the talcum powder, and the rest of the process remains unchanged. The details are as follows:

[0071] S1: Preparation of the polyester tire base layer: Place the ultra-thin long fiber reinforced polyester tire in silicone modified asphalt and soak it at 180°C, then take it out to obtain the polyester tire base layer;

[0072] S2: Preparation of modified asphalt binder: Mix 35 parts of 200# asphalt and 25 parts of 70# asphalt at 175°C and stir evenly. Then 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 part of nano-clay, and 25 parts of talcum powder. Stir and disperse at high speed for 1 h, keep warm at 150°C, and discharge through a colloid mill into an oil coating tank to obtain the modified asphalt binder;

[0073] S3: Preparation of active silicon crystal particles: Mix 3 parts of permeable crystalline active substance with 74 parts of 425# cement and 23 parts of pure water, stir evenly, pour into a mold for curing and forming to obtain a cement block; Crush it through a crusher, pass through a 40-mesh sieve, add 12 wt% of organic adhesive, mix evenly, and bake at 220°C for 5 h to obtain crystal particles;

[0074] S4: Evenly coat both sides of the polyester tire base with the modified asphalt binder to form a first modified asphalt binder layer and a second modified asphalt binder layer; Directly cover a polyester PET film layer on the first modified asphalt binder layer; Sequentially set a polymer film layer, coat with the modified asphalt binder to form a third modified asphalt binder layer, and evenly lay the crystal particles to form an active silicon crystal particle layer on the second modified asphalt binder layer; Dry and cool to obtain a waterproof coiled material.

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

[0076] (1) Ultrasonically disperse 3.5 parts of talcum powder in 55 parts of an ethanol solution with a mass fraction of 28%. Under high-speed stirring, gradually dropwise add a mixed solution of 11.5 parts of tetraethyl orthosilicate and trimethoxyvinylsilane (the mass ratio of tetraethyl orthosilicate to trimethoxyvinylsilane is 1:0.6), adjust the pH to 3, stir at 45°C for 35 min, adjust the pH to 8.5, stir at 45°C for 1 h, and dry at 200°C under a nitrogen atmosphere to obtain vinyl-modified talcum powder; (2) Add 12 parts of vinyl-modified talcum powder to 75 parts of deionized water and disperse evenly. Add 7.5 parts of sodium acrylate and 0.1 part of benzoyl peroxide, stir at 65°C for 3.5 h, filter, wash, and dry to obtain polymer-modified talcum powder; (3) Add 16 parts of polymer-modified talcum powder and 0.5 part of p-toluenesulfonic acid to 22 parts of hydroxyl silicone oil, stir at 75°C for 4 h, filter, and dry to obtain modified talcum powder.

[0077] Performance test (1): Test the physical and mechanical properties of the product of Example 1 in accordance with the standard GB / T23457-2017 "Pre-laid Waterproof Coiled Material", and the experimental data are shown in Table 1.

[0078] Table 1

[0079]

[0080] Through research and development testing, Example 1 of the present invention has the best performance. As shown in Table 1, the physical properties of the asphalt-based pre-laid waterproofing membrane prepared in Example 1 of the present invention meet the requirements of this standard. Therefore, the performance of Example 1 and other comparative examples was tested.

[0081] Performance test (2): According to the standard GB / T 23457-2017 "Pre-laid Waterproofing Membrane", the tensile strength and the phenomena during stretching 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 can be seen from Table 2: In Comparative Example 1, a polyester tire base was prepared using short fiber polyester tire, which is more difficult for the tire base glue to penetrate, and the tensile strength is reduced; Comparative Example 2: During the preparation of the crystalline particles, no organic adhesive was added, and the binding property with the asphalt binder is poor and it is easy to separate; Comparative Example 3: The talcum powder was not modified, resulting in poor dispersibility and reduced tensile strength; Comparative Example 4: When the talcum powder was modified with hydroxy silicone oil, the reaction time was increased, the loading amount of hydroxy silicone oil increased, the density was too large, and the tensile strength was reduced.

[0085] Performance test (3): Take the coil sample of Example 1 and conduct a chloride ion permeability test according to the standard JTS153-2015 "Durability Design Standard for Water Transportation Engineering Structures". The experimental data are shown in Table 3.

[0086] Table 3

[0087] Project <![CDATA[Chloride ion permeability / (mg / cm 2 ·d)]]> Example 1 0.0014

[0088] As can be seen from Table 3, the chloride ion permeability of the asphalt-based waterproofing membrane prepared by the present invention is ≤0.005mg / cm 2 ·d, which is more than 20 times that of ordinary asphalt-based waterproofing membranes. It can effectively protect the main body of the building structure from being eroded by corrosive media and extend the service life of the building.

[0089] Performance test (4): Take the coil sample of Example 1 and prepare a concrete impermeability performance test piece with a coating, and conduct performance tests on the impermeability pressure (28d) of the coated concrete and the second impermeability pressure (56d) of the coated concrete according to the standard GB 18445-2012 "Cementitious Penetration Crystalline Waterproofing Materials". The experimental data are shown in Table 4.

[0090] Specimen preparation: Place the cut waterproof sheet with a circular diameter of 175 mm into the mold as the bottom lining material, directly pour concrete on the surface layer. When forming, load in two layers and use manual ramming method. Level the surface with an iron plate and place it in the standard curing room, then demold after standing for 1 day. Then immerse the specimen in water with a depth of three-fourths of the specimen height for curing, the water temperature is (20±2°C), and the environmental humidity is greater than 95%. Take out the specimens cured to the specified age. Peel the self-adhesive surface of the specimen (the part bonded to the concrete surface layer, no need for grinding treatment), wipe the specimen clean and dry it for testing.

[0091] Table 4

[0092]

[0093] As can be seen from Table 4, the asphalt-based waterproof coiled material prepared by the present invention can repair concrete microcracks, has the function of slow-release self-repair, and forms a double waterproof layer with the function of secondary anti-seepage, and is mainly applicable to the waterproofing of underground projects.

[0094] In summary, the present invention successfully provides a slow-release self-repair asphalt-based pre-laid waterproof coiled material by using a polyester tire base layer prepared with ultra-thin long fiber reinforced polyester tire, an active silicon crystal grain layer with self-repair function, and a modified asphalt binder. At the same time, it has good tensile strength, high interlayer bonding strength and other characteristics.

[0095] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane, characterized in that: It includes the following steps: S1: Immerse an ultra-thin long fiber reinforced polyester tire in silicone modified asphalt, take it out, and obtain a polyester tire base layer (5); S2: Heat and stir 200# asphalt and 70# asphalt evenly; then sequentially add SBS styrene-butadiene-styrene copolymer, SBR styrene-butadiene rubber, APAO polymer, silane coupling agent, magnesium hydroxide, and nano-clay; fully melt and disperse; add talcum powder and stir at high speed for dispersion; discharge through a colloid mill to obtain a modified asphalt binder; S3: Sequentially add a penetrant crystalline substance and cement to pure water, stir evenly, cure and form, crush and screen to obtain particles; mix them evenly with an organic adhesive and bake at 200-240°C for 4-8 hours to obtain crystalline particles; S4: Uniformly coat both sides of the polyester tire base layer (5) with the modified asphalt binder to form a first modified asphalt binder layer (6) and a second modified asphalt binder layer (4); directly cover a polyester PET film layer (7) on the first modified asphalt binder layer (6); sequentially set a polymer film layer (3), coat with the modified asphalt binder to form a third modified asphalt binder layer (2), and uniformly lay crystalline particles to form an active silicon crystalline particle layer (1) on the second modified asphalt binder layer (4); dry and cool to obtain a waterproof coiled material.

2. The preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing 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 with a mass ratio of 1:1; the immersion temperature is 175-185°C.

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

4. The preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane according to claim 1, wherein: In S2, the temperature for heating and stirring evenly is 170-180°C; the temperature for fully melting and dispersing is 170-180°C and the time is 1.5-2 h; the temperature for high-speed stirring and dispersing is 140-160°C and the time is 1-2 h.

5. The preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane according to claim 1, characterized in that: The talcum powder is pre-modified and then added to the modified asphalt binder; the preparation method of the modified talcum powder includes the following steps: (1) Ultrasonically disperse talcum powder in a 28-30% ethanol solution, and gradually drop a mixed solution of tetraethyl orthosilicate and triethylmethoxysilane with a mass ratio of 1:0.5-0.7 under high-speed stirring, adjust the pH to 3-3.5, stir at 40-45°C for 30-40 min, adjust the pH to 8-9, stir at 40-50°C for 1-1.5 h, and dry at 180-200°C under a nitrogen atmosphere to obtain vinylated modified talcum powder; (2) Add the vinylated modified talcum powder to deionized water and ultrasonically disperse it evenly, add sodium acrylate and benzoyl peroxide, stir at 60-70°C for 3-4 h, filter, wash, and dry to obtain polymer modified talcum powder; (3) Add the polymer-modified talcum powder and p-toluenesulfonic acid to hydroxy silicone oil, stir at 70 - 80 °C for 1.5 - 2 h, filter and dry to obtain the modified talcum powder.

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

7. The preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane according to claim 1, characterized in that: The raw materials of the crystal particles comprise the following components: in parts by mass, 2.5 - 3.5 parts of penetrant crystalline substance, 73 - 75 parts of 425# cement, 22 - 24 parts of pure water; The addition amount of the organic adhesive is 10 - 15 wt% of the cement block; During the screening process, the sieve mesh number is 20 - 80 meshes.

8. The preparation method of a slow-release self-healing asphalt-based pre-laid waterproofing membrane according to claim 1, characterized in that: The penetrant crystalline substance includes aluminum silicate, magnesium silicate, sodium methyl silicate, and aluminum stearate, and their mass ratio is 1:1 - 1.2:3 - 4:1.4 - 1.6; 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, 1 - 2 parts of deionized water.

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

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