Flood resistant insulation sand, non-asphalt based pre-paved waterproofing membrane and method of making

Abstract

This invention relates to a water-resistant isolation sand, a non-asphalt-based pre-laid waterproof membrane, and its preparation method. The membrane comprises a core layer, an intermediate layer, and an outer layer. The core layer is prepared from ordinary silicate cement, fly ash, admixtures, and water. The intermediate layer includes sequentially stacked layers A, B, and A and B, respectively prepared from A and B solutions. The A solution is prepared from sodium silicate, potassium silicate, surfactant A, a reaction retarder, a reducing agent, a reaction accelerator, a surface strengthening agent, and water. The B solution is prepared from calcium hydroxide, sodium hydroxide, surfactant B, and water. The outer layer is prepared from a silane coupling agent alcohol solution. This invention overcomes the shortcomings of existing waterproof membranes where the heat-melting pressure-sensitive adhesive layer peels off from the substrate upon contact with water. The water-resistant isolation sand is formed by sequentially wrapping the core layer, intermediate layer, and outer layer, and then forming the waterproof membrane, resulting in excellent waterproof performance.

Description

Technical Field

[0001] This invention relates to a water-resistant isolation sand, a non-asphalt-based pre-laid waterproof membrane and its preparation method, which is applied in the field of waterproof building materials production. Background Technology

[0002] The descriptions in this section are provided only as background information relating to this disclosure and do not constitute prior art.

[0003] Non-bitumen-based pre-laid waterproof membranes consist of a substrate, a hot-melt pressure-sensitive adhesive layer, and a release sand layer (i.e., a surface anti-sticking layer composed of release sand) stacked from bottom to top. In use, the non-bitumen-based pre-laid waterproof membrane is first laid on the surface of the object requiring waterproofing, and then concrete is poured over the surface of the non-bitumen-based pre-laid waterproof membrane to completely cover it.

[0004] Currently available non-asphalt-based pre-laid waterproof membranes are prone to the following problems when used, due to the alkaline salt components contained in both concrete and the existing isolation sand layer:

[0005] 1. During the construction of non-asphalt-based pre-laid waterproof membrane, if it rains, water is likely to accumulate on the surface of the membrane. When the water comes into contact with the isolation sand layer on the surface of the membrane, it will dissolve the inorganic substances such as alkaline salts contained in the isolation sand layer, thereby producing an alkaline aqueous solution. This alkaline aqueous solution will cause the isolation sand layer to fall off, or even the hot melt pressure-sensitive adhesive layer to peel off from the substrate.

[0006] 2. During the immersion test, the alkaline salt components contained in the isolation sand of the non-asphalt-based pre-laid waterproof membrane will dissolve into the water, making the water highly alkaline (i.e., producing an alkaline aqueous solution). This can easily cause the isolation sand layer to fall off, or even the hot melt pressure-sensitive adhesive layer to peel off from the substrate.

[0007] 3. After pouring concrete on non-asphalt-based pre-laid waterproof membrane, during the curing process of the concrete or in the later stages when cracks appear in the concrete layer and water seeps into the cracks, the alkaline salt components in the concrete are prone to dissolving into the water to form an alkaline aqueous solution, which can cause the isolation sand layer to lose sand, or even the hot melt pressure-sensitive adhesive layer to peel off from the substrate.

[0008] For example, the surface anti-adhesion layer (i.e., the isolation sand layer) of non-asphalt-based pre-laid waterproof membrane products currently on the market often uses surface-treated inorganic sintered sand. This surface treatment refers to the crude application of silane coupling agents to treat the inorganic sintered sand, which fails to fully utilize the connecting effect of the silane coupling agent (the silane oxygen groups in the silane coupling agent are reactive to inorganic substances, and the organic functional groups are reactive or compatible with organic substances. Therefore, when the silane coupling agent is located between the inorganic and organic interfaces, a bonded layer of organic matrix-silane coupling agent-inorganic matrix can be formed). For instance, the isolation sand preparation method disclosed in Chinese Patent CN202011588135.6 first hydrolyzes the silane coupling agent to obtain a hydrolysate, and then uses this hydrolysate to treat inorganic mineral particles. This method causes the triethoxy-based silane coupling agent used to form transparent mesh film fragments in the hydrolysate during hydrolysis, thus losing some of its surface treatment effect. While treating the surface of inorganic sintered sand particles with this hydrolysate can improve the bond strength between the isolation sand layer and the hot-melt pressure-sensitive adhesive layer, it does not significantly improve the peel strength between the concrete after subsequent water immersion treatment and the non-asphalt-based pre-laid waterproof membrane. After concrete pouring, because a water-repellent layer cannot be formed through hydrolysis, the alkaline aqueous solution generated during concrete pouring and curing will gradually erode the hydrolyzed silane coupling agent-treated layer. When the alkaline aqueous solution comes into contact with the contact surface between the hot-melt pressure-sensitive adhesive layer and the isolation sand layer, it can cause the pre-laid non-asphalt-based pre-laid waterproof membrane to lose its adhesion, thus affecting the overall waterproof performance.

[0009] Therefore, providing a waterproof, immersion-resistant isolation sand with excellent waterproof performance, a non-asphalt-based pre-laid waterproof membrane, and its preparation method has become an urgent task. Summary of the Invention

[0010] To overcome the shortcomings of existing non-asphalt-based pre-laid waterproof membrane products, which are prone to sand loss and even peeling of the hot-melt pressure-sensitive adhesive layer from the substrate when exposed to water due to the presence of alkaline salts in both the isolation sand and concrete, this invention provides a water-resistant isolation sand, a non-asphalt-based pre-laid waterproof membrane, and its preparation method. The water-resistant isolation sand is made by sequentially wrapping a core layer, an intermediate layer, and an outer layer composed of optimized components. The non-asphalt-based pre-laid waterproof membrane prepared with this water-resistant isolation sand has the advantage of excellent water resistance (i.e., waterproof performance).

[0011] The technical solution of the present invention is as follows:

[0012] A water-resistant insulating sand consists of a core layer, an intermediate layer and an outer layer that are sequentially arranged around the core layer from the inside out.

[0013] The core layer has a mesh size of 60-80 and is mainly composed of the following components in the following weight ratios:

[0014]

[0015] The additive is one or any combination of two or more of aluminum sulfate, aluminum nitrate, ferric nitrate and triethanolamine;

[0016] The intermediate layer comprises, sequentially stacked from the core layer to the outermost layer, layers A and B, wherein layers A and B are prepared from solutions A and B, respectively; the solution A is mainly prepared from the following components in the following weight ratios:

[0017]

[0018] The solution of agent B is mainly prepared from the following components in the following weight ratios:

[0019]

[0020] The outer layer is prepared from a silane coupling agent alcohol solution, which is made by mixing a silane coupling agent with an equal weight of ethanol.

[0021] The water-resistant isolation sand of this application is prepared by sequentially wrapping a core layer, an intermediate layer, and an outer layer composed of optimized components. The non-asphalt-based pre-laid waterproof membrane prepared using this water-resistant isolation sand has excellent water resistance (i.e., waterproof performance). The core layer is mainly composed of ordinary silicate cement, water, and fly ash; the intermediate layer uses a nano-silicate multilayer composite permeable crystallizing material; and the outer layer is mainly composed of a silane coupling agent. The water-resistant isolation sand of this application has a specially designed structure and optimized the components involved in each layer, mainly in the following three parts: ① A three-layer structure is adopted: the core material of the core layer provides sufficient strength, the intermediate layer is a composite permeable crystallizing layer, and the outer layer is a silane coupling agent treated layer; ② The composite permeable crystallizing layer of the intermediate layer adopts a nano-scale silicate permeable crystallizing system, consisting of four mutually isolated ABCD layers (corresponding to alternating layers A, B, and A and B layers stacked sequentially from the core layer to the outer layer). The function of layer A is to reinforce the compressive strength of the core material. During the hydration of the core cement, the sodium silicate in layer A dissociates, providing a large amount of [SiO4]4-, which combines with the high concentration of Ca2+ on the cement surface of the core to form calcium silicate, filling the gaps in the core. Simultaneously, calcium silicate rapidly forms on the cement surface of the core, encapsulating the outside of the core material. The function of layer B is: after the substances in layers C and D have reacted in the alkaline aqueous solution and penetrated the gap between them, it reacts with the residual agent solution in layer A to form a penetrating crystalline material to fill the gap between layers C and D; layers C and D... The function of the layers is that after the outer water-repellent layer is eroded and penetrated by the alkaline aqueous solution, the [SiO4]4- and Ca2+ in layers C and D will penetrate into the gaps between the outer layer and the concrete and combine to produce calcium silicate, thus filling the gaps and providing a certain degree of protection (i.e., it can react with the contacting alkaline aqueous solution to form a new protective layer, which can penetrate and crystallize to fill the gaps in the outer layer); ③ The outer layer mainly uses silane coupling agent. During use, it can undergo hydrolysis upon contact with the alkaline aqueous solution, forming a water-repellent layer on the outermost layer of the water-resistant isolation sand, providing waterproof protection. Among them, the admixtures are mainly used to participate in the cement hydration reaction during the core layer production process, accelerate the cement curing speed, and improve the strength of the core layer while reducing production time.

[0022] The fly ash is one of low-calcium fly ash, high-calcium fly ash, or composite fly ash, or any combination of two or more thereof, and the mesh size of the fly ash is greater than 100 mesh.

[0023] The best quality fly ash provides a higher calcium ion content, which can increase the reaction rate when reacting with the alkaline aqueous solution in the subsequent intermediate layer.

[0024] The surfactant A is one or any combination of stearic acid or sodium dodecylbenzenesulfonate.

[0025] The reaction delay agent is a strong base salt.

[0026] The reducing agent is one or any combination of two of the following: thiourea salts or thiosulfates.

[0027] The reaction promoter is one or any combination of two of the following: citrates or carbonates.

[0028] The surface strengthening agent is one or any combination of two of calcium formate or halide salts.

[0029] The surfactant B is one or any combination of benzalkonium chloride or benzalkonium bromide;

[0030] The silane coupling agent is one or any combination of two or more monomers such as isobutyltriethoxysilane, isobutylenetriethoxysilane, isooctyltriethoxysilane, or dodecyltriethoxysilane.

[0031] The preferred surfactant A allows the various components in the solution of agent A to better blend together, forming a homogeneous solution; the preferred reaction retarder can delay the reaction of Ca in the solution of agent A. 2+ With the core layer or in alkaline aqueous solution [SiO4] 4- The reaction helps Ca 2+ It gradually penetrates into the core layer or the gaps in the concrete and then interacts with [SiO4]. 4- The reaction, thus providing a certain physical barrier; the preferred reducing agent ensures that the various reagents in the agent solution are not easily oxidized and lose their effectiveness during the process of the agent layer solidifying on the particle surface; the preferred reaction promoter can react with the Ca in the agent solution. 2+ After penetrating into the gaps between the core layer and the concrete, it combines with [SiO4]. 4- The resulting solid aggregates better and integrates better with the inorganic components of the core layer and concrete, ensuring sufficient filling strength for the gaps. A preferred surface strengthener enhances the surface strength of the A layer during drying and curing, thereby improving the overall surface strength of the particles. A preferred surfactant B improves the surface activity of the B solution, allowing for better bonding with the A layer and with the outer layer, thus enhancing the overall structural stability. A preferred triethoxy-based silane coupling agent, during hydrolysis, condenses its triethoxy groups to form a network film structure, creating a first protective layer on the particle surface.

[0032] The reaction delay agent is one or any combination of sodium hydroxide or potassium hydroxide.

[0033] Preferred reaction delay agents result in higher reaction efficiency.

[0034] The A solution also includes 0.5-1 part of inorganic color powder, and the B solution also includes 0.5-1 part of inorganic color powder.

[0035] When using this product, inorganic pigments can be added to adjust the color during the preparation of the intermediate layer according to actual needs. Green and blue are cool colors, while red, yellow, and orange are warm colors. The colors used can be one of these or any combination of two or more.

[0036] A non-asphalt-based pre-laid waterproof membrane includes a substrate, a hot-melt pressure-sensitive adhesive layer, and an isolation sand layer made of water-resistant isolation sand, stacked from bottom to top.

[0037] This application's non-asphalt-based pre-laid waterproof membrane uses specially prepared water-resistant isolation sand as an isolation sand layer to protect the hot-melt pressure-sensitive adhesive layer. The surface of the hot-melt pressure-sensitive adhesive layer has several protective isolation layers (i.e., outer layer + D layer + C layer + B layer + A layer + core layer + A layer + B layer + C layer + D layer + outer layer) that work in stages to achieve long-term protection of the membrane. During the manufacturing process, the outer layer of water-resistant isolation sand first contacts the hot-melt pressure-sensitive adhesive layer. Since the outer layer mainly uses a silane coupling agent, it improves the wettability between the isolation sand layer and the hot-melt pressure-sensitive adhesive layer, thereby enhancing the adhesion between them.

[0038] During construction, because a non-asphalt-based pre-laid waterproof membrane is laid first, and then concrete is poured on the surface of the non-asphalt-based pre-laid waterproof membrane, macroscopically, two water-repellent layers are formed between the hot-melt pressure-sensitive adhesive layer and the isolation sand layer, and between the isolation sand layer and the concrete. Specifically: 1. The outermost layer of the water-resistant isolation sand layer will form a water-repellent layer (first water-repellent layer) between itself and the hot-melt pressure-sensitive adhesive layer. This effectively prevents irreversible damage to the hot-melt pressure-sensitive adhesive layer caused by alkaline aqueous solutions. This water-repellent layer protects the hot-melt pressure-sensitive adhesive layer from erosion by alkaline aqueous solutions, preventing the adhesive layer from separating from the substrate; 2. The alkaline aqueous solution in the concrete can undergo a hydrolytic reaction with the outer layer (mainly composed of silane coupling agent), forming another water-repellent layer (second water-repellent layer) between the concrete and the isolation sand layer. This water-repellent layer can temporarily prevent the alkaline aqueous solution from eroding the membrane during the initial stage of concrete hydration.

[0039] In the later stages of concrete hydration, the second water-repellent layer is gradually destroyed by the hydration reaction, exposing the D layer of the intermediate water-resistant isolation sand. When cracks appear in the concrete layers later, external water comes into contact with the D layer through these cracks, and the Ca in the D layer... 2+ It will dissolve in water, and as water continues to erode into the C layer, the sodium silicate in the C layer will dissociate, providing a large amount of [SiO4]. 4- With high concentrations of Ca in water 2+The generated calcium silicate fills the gaps in the concrete and forms a calcium silicate layer on the concrete surface, providing a certain degree of isolation. Similarly, when the calcium silicate layer formed in layers C and D is damaged, the substances in layers A and B react to generate calcium silicate, which again fills the gaps in the concrete and forms a calcium silicate layer on the concrete surface, providing another degree of isolation. This strengthens the bond between the hot-melt pressure-sensitive adhesive layer, the isolation sand layer, and the concrete layer, achieving the goal of long-term protection for the membrane.

[0040] The thickness of the substrate is 0.9±0.02mm, and the thickness of the hot melt pressure-sensitive adhesive layer is 0.3±0.02mm.

[0041] The combination of a preferred substrate and a hot-melt pressure-sensitive adhesive layer enables non-bitumen-based pre-laid waterproof membranes to simultaneously achieve both strength and ease of construction (suitable for roll-up operations).

[0042] The hot melt pressure-sensitive adhesive layer uses a commercially available hot melt pressure-sensitive adhesive specifically designed for pre-laying waterproof membranes.

[0043] The substrate is mainly prepared from the following components in the following weight ratios:

[0044]

[0045] The addition of expanded perlite and organically coated fumed silica to the preferred substrate formulation, along with other optimized components and their proportions, results in a higher concentration of sound-insulating cavitation structures within the substrate, thus achieving a certain degree of noise reduction. Furthermore, the low density of expanded perlite and organically coated fumed silica lowers the overall density of the substrate. Therefore, while achieving noise reduction, the amount of material used and transportation costs are also reduced.

[0046] The method for preparing the water-resistant isolation sand includes the following steps performed in sequence:

[0047] (a) Preparing the core layer of water-resistant isolation sand, including the following steps:

[0048] (1) Start the mixer and adjust the mixing speed to 60-100 rpm. Put ordinary silicate cement and fly ash into the mixer and mix them. Add the admixture while mixing until the mixture is uniform. After 1-2 minutes, add water and mix evenly to make a slurry. Pour the slurry into the mold.

[0049] (2) After the slurry has solidified into a cement block in the mold, the mold is removed and the cement block is then cured at 18-22℃ and 94-96% humidity for at least 7 days.

[0050] (3) After the cured cement blocks are crushed, they are passed through a 60-80 mesh sieve to obtain the core layer;

[0051] (II) Preparation of the intermediate layer of water-resistant isolation sand, including the following steps:

[0052] (1) Preparation of solution A

[0053] Start the mixer and adjust the stirring speed to 500-1000 rpm. Add surfactant A, reaction delay agent, reducing agent, reaction accelerator, surface strengthening agent and water into the mixer and stir to disperse. While stirring, add sodium silicate and potassium silicate into the mixture in 2-3 portions each and mix evenly to obtain solution A.

[0054] (2) Preparation of Agent B solution

[0055] Add calcium hydroxide, sodium hydroxide and surfactant B to water and stir until completely homogeneous to obtain solution B;

[0056] (3) Start the solid mixer and adjust the stirring speed to 60-100 rpm. Put the core layer into the solid mixer and spray half of the total amount of agent A solution while stirring. Then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃.

[0057] (4) Keep the stirring speed at 60-100 rpm, spray half of the total amount of agent B solution while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃.

[0058] (5) Keep the stirring speed at 60-100 rpm, spray the remaining solution of agent A while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃.

[0059] (6) Keep the stirring speed at 60-100 rpm, spray the remaining agent B solution while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃ to obtain the core layer with the intermediate layer.

[0060] (III) Preparation of the outer layer of water-resistant isolation sand

[0061] Start the solid mixer and adjust the mixing speed to 60-100 rpm. Place the core layer with the intermediate layer into the solid mixer and spray some silane coupling agent alcohol solution while mixing. Then dry at 90-110℃ for at least 1 hour. Repeat the spraying and drying steps 2-3 times to obtain water-resistant isolation sand.

[0062] The preparation method of the water-resistant isolation sand of this application is simple and easy to operate. It uses ordinary silicate cement, fly ash and water to solidify, cure and then crush and coarsely screen the particles as the core layer of the water-resistant isolation sand. The pre-treatment filler method is adopted, that is, the dried core material is treated with a preferred configuration of Agent A solution (sodium silicate, potassium silicate and various additives) and Agent B solution (calcium hydroxide, sodium hydroxide and various additives) to perform four pre-treatment filler coating treatments on the core layer. After the treatment is completed, it is dried to obtain semi-finished sand particles. Then, the pre-treatment filler method is adopted to treat the semi-finished sand particles with a silane coupling agent alcohol solution to finally obtain the water-resistant isolation sand.

[0063] In the step of preparing solution A, inorganic color powder was added and mixed before adding sodium silicate and potassium silicate; inorganic color powder was also added and mixed in the step of preparing solution B.

[0064] When using this product, inorganic colorants can be added to adjust the color of the intermediate layer as needed.

[0065] The preparation method of the non-bitumen-based pre-laid waterproof membrane includes the following steps performed in sequence:

[0066] (1) Preparation of substrate

[0067] (2) Place the substrate flat on the peeling base plate of the coating machine, fix both ends to make it flat and wrinkle-free, apply hot melt pressure-sensitive adhesive to the substrate through the coating machine to form a hot melt pressure-sensitive adhesive layer, sprinkle water-resistant isolation sand while hot to cover the surface of the hot melt pressure-sensitive adhesive layer, and roll it with a pressure roller at least 3 times; then cool and cure for more than 6 hours at 23±2℃ and 50±10% humidity to obtain a non-asphalt-based pre-laid waterproof membrane.

[0068] The preparation method of the non-bitumen-based pre-laid waterproof membrane in this application is simple and easy to operate, and the obtained non-bitumen-based pre-laid waterproof membrane has excellent waterproof performance.

[0069] When preparing the substrate, high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyolefin elastomer, heavy calcium carbonate, antioxidant, expanded perlite, and organic-coated fumed silica are mixed evenly at 200-220℃ and then extruded to obtain the substrate.

[0070] The addition of expanded perlite and organic-coated fumed silica makes the substrate lightweight and noise-reducing.

[0071] Compared with the prior art, this invention application has the following advantages:

[0072] 1) The water-resistant isolation sand of this application is made by wrapping a core layer, an intermediate layer (the composite penetrating crystallization layer of the intermediate layer adopts a nano-level silicate penetrating crystallization system, which is composed of four mutually isolated ABCD layers (corresponding to the A layer, B layer, A layer and B layer stacked alternately from the core layer to the outer layer) and an outer layer in sequence to form water-resistant isolation sand, and is used to make a non-asphalt-based pre-laid waterproof membrane, which has the advantage of excellent waterproof performance;

[0073] 2) Non-asphalt-based pre-laid waterproof membranes use specially prepared water-resistant isolation sand as the isolation sand layer, forming two water-repellent layers between the hot-melt pressure-sensitive adhesive layer and the isolation sand layer, as well as between the isolation sand layer and the concrete, which greatly improves the waterproof performance and service life of non-asphalt-based pre-laid waterproof membranes.

[0074] 3) The preparation method of the water-resistant isolation sand is simple and easy to operate;

[0075] 4) The preparation method of the non-asphalt-based pre-laid waterproof membrane is simple and easy to operate. Attached Figure Description

[0076] Figure 1 This is a cross-sectional view of the water-resistant isolation sand, the non-asphalt-based pre-laid waterproof membrane, and the preparation method thereof described in this invention.

[0077] Figure 2 This is a cross-sectional view of the non-asphalt-based pre-laid waterproof membrane, which is described in this invention as a water-resistant isolation sand, a non-asphalt-based pre-laid waterproof membrane, and its preparation method.

[0078] Label Explanation:

[0079] 1. Isolation sand layer, 2. Hot melt pressure-sensitive adhesive layer, 3. Substrate, 1-1. Core layer, 1-2. Intermediate layer, 1-3. Outer layer, 1-2-1. Agent A layer, 1-2-2. Detailed Implementation

[0080] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0081] Example 1

[0082] like Figure 1-2 As shown, the water-resistant isolation sand of the present invention is composed of a core layer 1-1 and an intermediate layer 1-2 and an outer layer 1-3 arranged sequentially from the inside to the outside of the core layer 1-1.

[0083] The core layer 1-1 has a mesh size of 60-80 mesh and is mainly prepared from the following components in the following weight ratios:

[0084]

[0085] The additive is aluminum sulfate;

[0086] The intermediate layer 1-2 comprises, sequentially stacked from the core layer 1-1 towards the outer layer 1-3, an agent layer 1-2-1, an agent layer 1-2-2, and an agent layer 1-2-1 and an agent layer 1-2-2. Agent layer 1-2-1 and agent layer 1-2-2 are prepared from agent solution A and agent solution B, respectively. The agent solution A is mainly prepared from the following components in the following weight ratios:

[0087]

[0088] The solution of agent B is mainly prepared from the following components in the following weight ratios:

[0089]

[0090] The outer layers 1-3 are prepared from a silane coupling agent alcohol solution, which is made by mixing a silane coupling agent with an equal weight of ethanol.

[0091] The fly ash is low-calcium fly ash, and the mesh size of the fly ash is greater than 100 mesh.

[0092] The surfactant A is stearic acid.

[0093] The reaction delay agent is sodium hydroxide.

[0094] The reducing agent is a thiourea salt.

[0095] The reaction promoter is a citrate.

[0096] The surface strengthening agent is calcium formate.

[0097] The surfactant B is benzalkonium chloride;

[0098] The silane coupling agent is isobutyltriethoxysilane.

[0099] The A solution also includes 0.8 parts of inorganic color powder, and the B solution also includes 0.8 parts of inorganic color powder.

[0100] A non-asphalt-based pre-laid waterproof membrane includes a substrate 3, a hot-melt pressure-sensitive adhesive layer 2, and an isolation sand layer 1 made of the aforementioned water-resistant isolation sand, stacked from bottom to top.

[0101] The hot melt pressure-sensitive adhesive layer 2 uses a commercially available hot melt pressure-sensitive adhesive specifically designed for pre-laying waterproof membranes.

[0102] The substrate 3 is mainly prepared from the following components in the following weight ratios:

[0103]

[0104] The method for preparing the water-resistant isolation sand includes the following steps performed in sequence:

[0105] (a) Preparing the core layer of water-resistant isolation sand, including the following steps:

[0106] (1) Start the mixer and adjust the mixing speed to 80 rpm. Put ordinary silicate cement and fly ash into the mixer and mix them. Add admixtures while mixing until the mixture is uniform. After 1.5 minutes, add water and mix evenly to make a slurry. Pour the slurry into the mold.

[0107] (2) After the slurry has solidified into a cement block in the mold, the mold is removed and the cement block is then cured for 7 days at 20°C and 95% humidity.

[0108] (3) After the cured cement block is crushed, it is passed through a 60-80 mesh sieve to obtain the core layer 1-1.

[0109] (II) Preparation of the intermediate layer of water-resistant isolation sand, including the following steps:

[0110] (1) Preparation of solution A

[0111] Start the mixer and adjust the stirring speed to 800 rpm. Add surfactant A, reaction delay agent, reducing agent, reaction accelerator, surface strengthening agent and water into the mixer and stir to disperse. While stirring, add sodium silicate and potassium silicate into the mixture in two portions each and mix evenly to obtain solution A.

[0112] (2) Preparation of Agent B solution

[0113] Add calcium hydroxide, sodium hydroxide and surfactant B to water and stir until completely homogeneous to obtain solution B;

[0114] (3) Start the solid mixer and adjust the mixing speed to 80 rpm. Put the core layer 1-1 into the solid mixer and spray half of the total amount of agent solution while mixing. Then dry at 120℃ for 2 hours and then cool down to 23℃.

[0115] (4) Keep the stirring speed at 80 rpm, spray half of the total amount of agent B solution while stirring, then dry at 120℃ for 2 hours, and then cool down to 23℃.

[0116] (5) Keep the stirring speed at 80 rpm, spray the remaining solution of agent A while stirring, then dry at 120℃ for 2 hours, and then cool down to 23℃.

[0117] (6) Keep the stirring speed at 80 rpm, spray the remaining solution of agent B while stirring, then dry at 120°C for 2 hours, and then cool down to 23°C to obtain the core layer 1-1 with the intermediate layer 1-2.

[0118] (III) Preparation of the outer layer of water-resistant isolation sand

[0119] Start the solid mixer and adjust the mixing speed to 80 rpm. Place the core layer 1-1, which contains the intermediate layer 1-2, into the solid mixer. While mixing, spray a portion of the silane coupling agent alcohol solution. Then dry at 100°C for 1 hour. Repeat the spraying and drying steps 2.5 times to obtain water-resistant isolation sand.

[0120] In the step of preparing solution A, inorganic color powder was added and mixed before adding sodium silicate and potassium silicate; inorganic color powder was also added and mixed in the step of preparing solution B.

[0121] The method for preparing the non-asphalt-based pre-laid waterproof membrane is characterized by comprising the following steps performed in sequence:

[0122] (1) Preparation of substrate

[0123] (2) Place the substrate 3 flat on the peeling base plate of the coating machine, fix both ends to make it flat and wrinkle-free, apply hot melt pressure-sensitive adhesive to the substrate 3 through the coating machine to form hot melt pressure-sensitive adhesive layer 2, sprinkle water-resistant isolation sand while hot to cover the surface of hot melt pressure-sensitive adhesive layer 2, and roll it 3 times with a pressure roller; then cool and cure for 6 hours at 23℃ and 50% humidity to obtain non-asphalt-based pre-laid waterproof membrane.

[0124] When preparing the substrate, high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyolefin elastomer, heavy calcium carbonate, antioxidant, expanded perlite and organic coated fumed silica are mixed evenly at 210℃ and then extruded to obtain substrate 3.

[0125] Example 2

[0126] like Figure 1-2 As shown, the water-resistant isolation sand of the present invention is composed of a core layer 1-1 and an intermediate layer 1-2 and an outer layer 1-3 arranged sequentially from the inside to the outside of the core layer 1-1.

[0127] The core layer 1-1 has a mesh size of 60-80 mesh and is mainly prepared from the following components in the following weight ratios:

[0128]

[0129] The additive is any combination of aluminum sulfate and aluminum nitrate;

[0130] The intermediate layer 1-2 comprises, sequentially stacked from the core layer 1-1 towards the outer layer 1-3, an agent layer 1-2-1, an agent layer 1-2-2, and an agent layer 1-2-1 and an agent layer 1-2-2. Agent layer 1-2-1 and agent layer 1-2-2 are prepared from agent solution A and agent solution B, respectively. The agent solution A is mainly prepared from the following components in the following weight ratios:

[0131]

[0132]

[0133] The solution of agent B is mainly prepared from the following components in the following weight ratios:

[0134]

[0135] The outer layers 1-3 are prepared from a silane coupling agent alcohol solution, which is made by mixing a silane coupling agent with an equal weight of ethanol.

[0136] The fly ash is any combination of low-calcium fly ash and high-calcium fly ash, and the mesh size of the fly ash is greater than 100 mesh.

[0137] The surfactant A is sodium dodecylbenzenesulfonate.

[0138] The reaction delay agent is potassium hydroxide.

[0139] The reducing agent is a thiosulfate.

[0140] The reaction promoter is a carbonate.

[0141] The surface strengthening agent is a halide salt.

[0142] The surfactant B is benzalkonium bromide;

[0143] The silane coupling agent is any combination of isobutyltriethoxysilane and isobutylenetriethoxysilane.

[0144] The A solution also includes 0.5 parts of inorganic color powder, and the B solution also includes 1 part of inorganic color powder.

[0145] A non-asphalt-based pre-laid waterproof membrane includes a substrate 3, a hot-melt pressure-sensitive adhesive layer 2, and an isolation sand layer 1 made of the aforementioned water-resistant isolation sand, stacked from bottom to top.

[0146] The hot melt pressure-sensitive adhesive layer 2 uses a commercially available hot melt pressure-sensitive adhesive specifically designed for pre-laying waterproof membranes.

[0147] The substrate 3 is mainly prepared from the following components in the following weight ratios:

[0148]

[0149] The method for preparing the water-resistant isolation sand includes the following steps performed in sequence:

[0150] (a) Preparing the core layer of water-resistant isolation sand, including the following steps:

[0151] (1) Start the mixer and adjust the mixing speed to 60 rpm. Put ordinary silicate cement and fly ash into the mixer and mix them. Add admixtures while mixing until the mixture is uniform. After 1 minute, add water and mix evenly to make a slurry. Pour the slurry into the mold.

[0152] (2) After the slurry has solidified into a cement block in the mold, the mold is removed and the cement block is then cured for 8 days at 22°C and 94% humidity.

[0153] (3) After the cured cement block is crushed, it is passed through a 60-80 mesh sieve to obtain the core layer 1-1.

[0154] (II) Preparation of the intermediate layer of water-resistant isolation sand, including the following steps:

[0155] (1) Preparation of solution A

[0156] Start the mixer and adjust the stirring speed to 500 rpm. Add surfactant A, reaction delay agent, reducing agent, reaction promoter, surface strengthening agent and water into the mixer and stir to disperse. While stirring, add sodium silicate and potassium silicate into the mixture in two portions each and mix evenly to obtain solution A.

[0157] (2) Preparation of Agent B solution

[0158] Add calcium hydroxide, sodium hydroxide and surfactant B to water and stir until completely homogeneous to obtain solution B;

[0159] (3) Start the solid mixer and adjust the mixing speed to 60 rpm. Put the core layer 1-1 into the solid mixer and spray half of the total amount of agent solution while mixing. Then dry at 130℃ for 3 hours and then cool down to 21℃.

[0160] (4) Keep the stirring speed at 60 rpm, spray half of the total amount of agent B solution while stirring, then dry at 130℃ for 3 hours, and then cool down to 21℃.

[0161] (5) Keep the stirring speed at 60 rpm, spray the remaining solution of agent A while stirring, then dry at 130℃ for 3 hours, and then cool down to 21℃.

[0162] (6) Keep the stirring speed at 60 rpm, spray the remaining solution of agent B while stirring, then dry at 130℃ for 3 hours, and then cool down to 21℃ to obtain the core layer 1-1 with the intermediate layer 1-2.

[0163] (III) Preparation of the outer layer of water-resistant isolation sand

[0164] Start the solid mixer and adjust the mixing speed to 60 rpm. Place the core layer 1-1, which contains the intermediate layer 1-2, into the solid mixer. While mixing, spray a portion of the silane coupling agent alcohol solution. Then dry at 90°C for 2 hours. Repeat the spraying and drying steps twice to obtain water-resistant isolation sand.

[0165] In the step of preparing solution A, inorganic color powder was added and mixed before adding sodium silicate and potassium silicate; inorganic color powder was also added and mixed in the step of preparing solution B.

[0166] The method for preparing the non-asphalt-based pre-laid waterproof membrane is characterized by comprising the following steps performed in sequence:

[0167] (1) Preparation of substrate

[0168] (2) Place the substrate 3 flat on the peeling base plate of the coating machine, fix both ends to make it flat and wrinkle-free, apply hot melt pressure-sensitive adhesive to the substrate 3 through the coating machine to form hot melt pressure-sensitive adhesive layer 2, sprinkle water-resistant isolation sand while hot to cover the surface of hot melt pressure-sensitive adhesive layer 2, and roll it with a pressure roller 4 times; then cool and cure for 7 hours at 21℃ and 40% humidity to obtain non-asphalt-based pre-laid waterproof membrane.

[0169] When preparing the substrate, high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyolefin elastomer, heavy calcium carbonate, antioxidant, expanded perlite and organic coated fumed silica are mixed evenly at 210℃ and then extruded to obtain substrate 3.

[0170] Example 3

[0171] like Figure 1-2 As shown, the water-resistant isolation sand of the present invention is composed of a core layer 1-1 and an intermediate layer 1-2 and an outer layer 1-3 arranged sequentially from the inside to the outside of the core layer 1-1.

[0172] The core layer 1-1 has a mesh size of 60-80 mesh and is mainly prepared from the following components in the following weight ratios:

[0173]

[0174] The additives are any combination of aluminum sulfate, aluminum nitrate, ferric nitrate and triethanolamine;

[0175] The intermediate layer 1-2 comprises, sequentially stacked from the core layer 1-1 towards the outer layer 1-3, an agent layer 1-2-1, an agent layer 1-2-2, and an agent layer 1-2-1 and an agent layer 1-2-2. Agent layer 1-2-1 and agent layer 1-2-2 are prepared from agent solution A and agent solution B, respectively. The agent solution A is mainly prepared from the following components in the following weight ratios:

[0176]

[0177] The solution of agent B is mainly prepared from the following components in the following weight ratios:

[0178]

[0179] The outer layers 1-3 are prepared from a silane coupling agent alcohol solution, which is made by mixing a silane coupling agent with an equal weight of ethanol.

[0180] The fly ash is any combination of low-calcium fly ash, high-calcium fly ash, and composite fly ash, and the mesh size of the fly ash is greater than 100 mesh.

[0181] The surfactant A is any combination of stearic acid and sodium dodecylbenzenesulfonate.

[0182] The reaction delaying agent is any combination of sodium hydroxide and potassium hydroxide.

[0183] The reducing agent is any combination of thiourea salts and thiosulfates.

[0184] The reaction promoter is any combination of citrates and carbonates.

[0185] The surface strengthening agent is any combination of calcium formate and halide salts.

[0186] The surfactant B is any combination of benzalkonium chloride and benzalkonium bromide;

[0187] The silane coupling agent is any combination of monomers such as isobutyltriethoxysilane, isobutylenetriethoxysilane, isooctyltriethoxysilane, and dodecyltriethoxysilane.

[0188] The A solution also includes 1 part of inorganic color powder, and the B solution also includes 0.5 parts of inorganic color powder.

[0189] A non-asphalt-based pre-laid waterproof membrane includes a substrate 3, a hot-melt pressure-sensitive adhesive layer 2, and an isolation sand layer 1 made of the aforementioned water-resistant isolation sand, stacked from bottom to top.

[0190] The hot melt pressure-sensitive adhesive layer 2 uses a commercially available hot melt pressure-sensitive adhesive specifically designed for pre-laying waterproof membranes.

[0191] The substrate 3 is mainly prepared from the following components in the following weight ratios:

[0192]

[0193] The method for preparing the water-resistant isolation sand includes the following steps performed in sequence:

[0194] (a) Preparing the core layer of water-resistant isolation sand, including the following steps:

[0195] (1) Start the mixer and adjust the mixing speed to 100 rpm. Put ordinary silicate cement and fly ash into the mixer and mix them. Add admixtures while mixing until the mixture is uniform. After 2 minutes, add water and mix evenly to make a slurry. Pour the slurry into the mold.

[0196] (2) After the slurry has solidified into a cement block in the mold, the mold is removed and the cement block is then cured at 18°C ​​and 96% humidity for 9 days.

[0197] (3) After the cured cement block is crushed, it is passed through a 60-80 mesh sieve to obtain the core layer 1-1.

[0198] (II) Preparation of the intermediate layer of water-resistant isolation sand, including the following steps:

[0199] (1) Preparation of solution A

[0200] Start the mixer and adjust the stirring speed to 1000 rpm. Add surfactant A, reaction delay agent, reducing agent, reaction promoter, surface strengthening agent and water into the mixer and stir to disperse. While stirring, add sodium silicate and potassium silicate into the mixture in 3 portions each and mix evenly to obtain solution A.

[0201] (2) Preparation of Agent B solution

[0202] Add calcium hydroxide, sodium hydroxide and surfactant B to water and stir until completely homogeneous to obtain solution B;

[0203] (3) Start the solid mixer, adjust the mixing speed to 100 rpm, put the core layer 1-1 into the solid mixer, spray half of the total amount of agent A solution while mixing, and then dry at 110℃ for 4 hours, and then cool down to 25℃.

[0204] (4) Keep the stirring speed at 100 rpm, spray half of the total amount of agent B solution while stirring, then dry at 110℃ for 4 hours, and then cool down to 25℃.

[0205] (5) Keep the stirring speed at 100 rpm, spray the remaining solution of agent A while stirring, then dry at 110℃ for 4 hours, and then cool down to 25℃.

[0206] (6) Keep the stirring speed at 100 rpm, spray the remaining solution of agent B while stirring, then dry at 110℃ for 4 hours, and then cool down to 25℃ to obtain the core layer 1-1 with the intermediate layer 1-2.

[0207] (III) Preparation of the outer layer of water-resistant isolation sand

[0208] Start the solid mixer and adjust the mixing speed to 100 rpm. Place the core layer 1-1, which contains the intermediate layer 1-2, into the solid mixer. While mixing, spray a portion of the silane coupling agent alcohol solution. Then dry at 110℃ for 3 hours. Repeat the spraying and drying steps 3 times to obtain water-resistant isolation sand.

[0209] In the step of preparing solution A, inorganic color powder was added and mixed before adding sodium silicate and potassium silicate; inorganic color powder was also added and mixed in the step of preparing solution B.

[0210] The method for preparing the non-asphalt-based pre-laid waterproof membrane is characterized by comprising the following steps performed in sequence:

[0211] (1) Preparation of substrate

[0212] (2) Place the substrate 3 flat on the peeling base plate of the coating machine, fix both ends to make it flat and wrinkle-free, apply hot melt pressure-sensitive adhesive to the substrate 3 through the coating machine to form hot melt pressure-sensitive adhesive layer 2, sprinkle water-resistant isolation sand while hot to cover the surface of hot melt pressure-sensitive adhesive layer 2, and roll it with a pressure roller 5 times; then cool and cure for 8 hours at 25℃ and 60% humidity to obtain non-asphalt-based pre-laid waterproof membrane.

[0213] When preparing the substrate, high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyolefin elastomer, heavy calcium carbonate, antioxidant, expanded perlite and organic-coated fumed silica are mixed evenly at 220°C and then extruded to obtain substrate 3.

[0214] Raw material information involved in each embodiment:

[0215] Commercially available hot melt pressure-sensitive adhesive specifically designed for pre-applied waterproof membranes: DT930S from Kunshan Jiuqing New Material Technology Co., Ltd.;

[0216] Ordinary sintered sand: White sintered sand produced by Jiangsu Owens Color Co., Ltd. can be used.

[0217] Experimental data:

[0218] (a) Comparison Sample

[0219] Comparison Sample 1:

[0220] The difference between this comparative sample and Example 1 is that its isolation sand layer uses commercially available ordinary sintered sand, which is a mixture of ordinary sintered sand with mesh sizes of 60, 70 and 80 in a weight ratio of 3:2:1.

[0221] Comparison Sample 2:

[0222] The difference between this comparative sample and Example 1 is that its isolation sand layer uses commercially available ordinary sintered sand, which is a mixture of ordinary sintered sand with mesh sizes of 30, 40 and 50 in a weight ratio of 1:2:2.

[0223] Comparison Sample 3:

[0224] The difference between this comparative sample and Example 1 is that its isolation sand layer uses commercially available ordinary sintered sand, which is a mixture of ordinary sintered sand with mesh sizes of 40 mesh, 50 mesh, 60 mesh and 70 mesh in a weight ratio of 4:3:2:1.

[0225] (II) Detection Methods

[0226] (1) The sample preparation method for the peeling of non-asphalt-based pre-laid waterproof membrane from post-poured concrete without treatment is as follows: according to 6.20.1 of GB / T23457-2017, the non-asphalt-based pre-laid waterproof membrane sample is cut and mortar is poured. After curing for 7 days, the peel test is carried out.

[0227] (2) The sample preparation method for the separation of non-bitumen-based pre-laid waterproof membrane from the post-poured concrete after water immersion treatment is as follows: According to 6.20.1 of GB / T 23457-2017, the non-bitumen-based pre-laid waterproof membrane sample is first soaked in water for 7 days after cutting, and after the water immersion is completed, mortar is poured and cured for 7 days before the peel test is carried out.

[0228] (3) The sample preparation method for peeling non-asphalt-based pre-laid waterproof membrane after immersion in water with the post-poured concrete is as follows: refer to 6.20.1 in GB / T 23457-2017. After cutting the non-asphalt-based pre-laid waterproof membrane sample, pour mortar, cure for 7 days, and then immerse in water. Test the peel strength after immersion for 7 days, 14 days and 28 days respectively.

[0229] (III) Test Results

[0230] Table 1. Test results of various performance indicators

[0231]

[0232]

[0233] As can be seen from the table above, the test results of all performance indicators of the non-asphalt-based pre-laid waterproof membrane prepared using the water-resistant isolation sand of this application meet the requirements of the national standard GB / T 23457-2017, and are superior to the non-asphalt-based pre-laid waterproof membranes prepared using ordinary isolation sand samples of comparative samples 1-3; in the two water immersion peel tests, the peel strength performance of the products of each embodiment of this application does not show a significant decrease. It can be seen that the water-resistant isolation sand of this application is made by sequentially wrapping a core layer, an intermediate layer and an outer layer composed of preferred components. The non-asphalt-based pre-laid waterproof membrane prepared using this water-resistant isolation sand has excellent overall bonding strength with the post-poured concrete, and its isolation sand layer is not easy to peel off after immersion in water, thus having the advantage of excellent water resistance (i.e., waterproof performance).

Claims

1. A flood resistant insulating sand, characterized by: It consists of a core layer (1-1) and an intermediate layer (1-2) and an outer layer (1-3) that are sequentially arranged around the core layer (1-1) from the inside out; The core layer (1-1) has a mesh size of 60-80 and is mainly prepared from the following components in the following weight ratios: 35-50 parts of ordinary Portland cement 10-30 parts fly ash Additive 0.1-1 part, 10-30 parts water; The additive is one or any combination of two or more of the following: aluminum sulfate, aluminum nitrate, ferric nitrate, or triethanolamine. The intermediate layer (1-2) comprises, sequentially stacked from the core layer (1-1) towards the outer layer (1-3), a layer of agent A (1-2-1), a layer of agent B (1-2-2), and a layer of agent A (1-2-1) and a layer of agent B (1-2-2). Layers of agent A (1-2-1) and B (1-2-2) are prepared from agent A solution and agent B solution, respectively. The agent A solution is mainly prepared from the following components in the following weight ratios: 10-25 parts sodium silicate 10-25 parts potassium silicate Surfactant A 0.1-1 part, 0.1-1 part of reaction delay agent, 0.1-1 part reducing agent, 0.1-1 part of reaction accelerator, 0.1-1 part of surface hardener, 30-50 parts water; The solution of agent B is mainly prepared from the following components in the following weight ratios: 10-25 parts calcium hydroxide 10-25 parts sodium hydroxide, Surfactant B 0.1-1 part, 30-40 parts water; The outer layer (1-3) is prepared from a silane coupling agent alcohol solution, which is prepared by mixing a silane coupling agent with an equal weight of ethanol; The surfactant A is one or any combination of stearic acid or sodium dodecylbenzenesulfonate. The reaction delaying agent is one or any combination of sodium hydroxide or potassium hydroxide. The reducing agent is a thiosulfate. The reaction promoter is one or any combination of two of the following: citrates or carbonates. The surface strengthening agent is one or any combination of two of calcium formate or halide salts. The surfactant B is one or any combination of benzalkonium chloride or benzalkonium bromide; The silane coupling agent is one or any combination of two or more of isobutyltriethoxysilane, isobutylenetriethoxysilane, isooctyltriethoxysilane or dodecyltriethoxysilane.

2. The flood resistant isolation sand of claim 1, wherein: The fly ash is one of low-calcium fly ash, high-calcium fly ash, or composite fly ash, or any combination of two or more thereof, and the mesh size of the fly ash is greater than 100 mesh.

3. The water-resistant isolation sand according to claim 1, characterized in that: The A solution also includes 0.5-1 part of inorganic color powder, and the B solution also includes 0.5-1 part of inorganic color powder.

4. A non-bituminous based pre-paved waterproofing membrane characterized by: It includes a substrate (3) stacked from bottom to top, a hot melt pressure-sensitive adhesive layer (2), and an isolation sand layer (1) made of water-resistant isolation sand as described in any one of claims 1-3.

5. The non-bitumen based pre-paved waterproofing membrane according to claim 4, characterized in that: The hot melt pressure-sensitive adhesive layer (2) uses commercially available hot melt pressure-sensitive adhesive specifically designed for pre-laying waterproof membranes; The substrate (3) is mainly prepared from the following components in the following weight ratios: 20-30 parts of high-density polyethylene 45-65 parts of linear low-density polyethylene 20-30 parts of polypropylene 5-10 parts of thermoplastic polyolefin elastomer, 15-20 parts of heavy calcium carbonate Antioxidant 0.5-1 part; 5-10 parts expanded perlite 5-10 parts of organic-coated fumed silica.

6. The method for preparing water-resistant isolation sand according to any one of claims 1-2, characterized in that: The following steps are performed in sequence: (I) Preparing the core layer of water-resistant isolation sand (1-1), including the following steps: (1) Start the mixer and adjust the mixing speed to 60-100 rpm. Put ordinary silicate cement and fly ash into the mixer and mix them. Add admixtures while mixing until the mixture is uniform. After 1-2 minutes, add water and mix evenly to make a slurry. Pour the slurry into the mold. (2) After the slurry has solidified into a cement block in the mold, the mold is removed and the cement block is then cured at 18-22℃ and 94-96% humidity for at least 7 days. (3) After the cured cement block is crushed, it is passed through a 60-80 mesh sieve to obtain the core layer (1-1). (II) Preparation of the intermediate layer (1-2) of water-resistant isolation sand, including the following steps: (1) Preparation of solution A Start the mixer and adjust the stirring speed to 500-1000 rpm. Add surfactant A, reaction delay agent, reducing agent, reaction accelerator, surface strengthening agent and water into the mixer and stir to disperse. While stirring, add sodium silicate and potassium silicate into the mixture in 2-3 portions each and mix evenly to obtain solution A. (2) Preparation of solution B Add calcium hydroxide, sodium hydroxide and surfactant B to water and stir until completely homogeneous to obtain solution B; (3) Start the solid mixer and adjust the stirring speed to 60-100 rpm. Put the core layer (1-1) into the solid mixer and spray half of the total amount of agent A solution while stirring. Then dry it at 110-130℃ for at least 2 hours and then cool it down to 23±2℃. (4) Keep the stirring speed at 60-100 rpm, spray half of the total amount of agent B solution while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃. (5) Keep the stirring speed at 60-100 rpm, spray the remaining solution of agent A while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃; (6) Keep the stirring speed at 60-100 rpm, spray the remaining solution of agent B while stirring, and then dry at 110-130℃ for at least 2 hours, and then cool down to 23±2℃ to obtain the core layer (1-1) with the intermediate layer (1-2). (III) Preparation of the outer layer of water-resistant isolation sand Start the solid mixer and adjust the mixing speed to 60-100 rpm. Place the core layer (1-1) with the intermediate layer (1-2) into the solid mixer and spray a portion of the silane coupling agent alcohol solution while mixing. Then dry at 90-110℃ for at least 1 hour. Repeat the spraying and drying steps 2-3 times to obtain water-resistant isolation sand.

7. The method of claim 6, wherein: In the step of preparing solution A, inorganic color powder was added and mixed before adding sodium silicate and potassium silicate; inorganic color powder was also added and mixed in the step of preparing solution B.

8. The method for preparing the non-bitumen-based pre-laid waterproof membrane according to claim 4, characterized in that: The steps are as follows, performed in sequence: (1) Preparation of substrate (2) Place the substrate (3) flat on the peeling base plate of the coating machine, fix both ends to make it flat and wrinkle-free, apply hot melt pressure-sensitive adhesive to the substrate (3) through the coating machine to form a hot melt pressure-sensitive adhesive layer (2), sprinkle water-resistant isolation sand while hot to cover the surface of the hot melt pressure-sensitive adhesive layer (2), and roll it with a pressure roller at least 3 times; then cool and cure for more than 6 hours at 23±2℃ and 50±10% humidity to obtain a non-asphalt-based pre-laid waterproof membrane.

9. The method of claim 8, wherein the non-asphaltic pre-paved waterproofing membrane is prepared by: When preparing the substrate, high-density polyethylene, linear low-density polyethylene, polypropylene, thermoplastic polyolefin elastomer, heavy calcium carbonate, antioxidant, expanded perlite and organic coated fumed silica are mixed evenly at 200-220℃ and then extruded to obtain the substrate (3).

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