High-strength PVC waterproof coiled material and preparation method thereof

Abstract

The application relates to the technical field of waterproof coiled materials, and particularly discloses a high-strength PVC waterproof coiled material and a preparation method thereof, wherein the high-strength PVC waterproof coiled material is obtained by hot-pressing compounding of polyester cloth, polyvinyl chloride coiled material and glass fiber mesh cloth. The polyvinyl chloride coiled material is obtained by blending extrusion of composite modified nano-silicon dioxide (with nano-silicon dioxide as a core and polybutyl acrylate as a shell), polyvinyl chloride, polyvinylidene fluoride and other additives, and the surface of the composite modified nano-silicon dioxide contains amino groups. Compared with general PVC waterproof coiled materials, the high-strength PVC waterproof coiled material has high strength, good toughness, improved heat-resistant stability and ultraviolet aging resistance.

Description

Technical Field

[0001] This invention relates to the field of waterproof membrane technology, specifically to a high-strength PVC waterproof membrane and its preparation method. Background Technology

[0002] Waterproofing in building construction has always been an unavoidable challenge for designers and construction workers. Common solutions include using waterproof membranes or coatings. Compared to coatings, waterproof membranes offer advantages such as suitability for large-area application, no need for curing after installation, and uniform waterproof layer thickness. Polyvinyl chloride (PVC) waterproof membranes are high-molecular-weight waterproof membranes made primarily of polyvinyl chloride resin. They feature high elongation, low shrinkage, long service life, stable performance, and easy construction, making them suitable for harsh environments such as tunnels, highways, viaducts, and landfills. However, ordinary PVC waterproof membranes lack sufficient strength and aging resistance, making them susceptible to damage in these harsh environments and reducing their waterproofing effectiveness. Therefore, there is a need to develop PVC waterproof membranes with higher strength and better aging resistance. Summary of the Invention

[0003] The purpose of this invention is to provide a high-strength PVC waterproof membrane and its preparation method, thereby solving the problems of insufficient strength and poor aging resistance of ordinary PVC waterproof membranes.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] A method for preparing a high-strength PVC waterproof membrane, characterized in that: the preparation method is as follows:

[0006] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 145-180℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0007] As a limitation of the present invention, the method for preparing the polyvinyl chloride roll is as follows:

[0008] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), composite modified nano-silica, and additives are mixed and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls are prepared. The mixing temperature during co-extrusion is 70–90°C, the extrusion temperature is 170–190°C, and the screw speed is 10–30 rpm.

[0009] As a limitation of this invention, the preparation method of the composite modified nano-silica is as follows:

[0010] Nano-silica and toluene were mixed at a mass ratio of 1:(24-26) and ultrasonically dispersed for 20-40 min to obtain a nano-silica dispersion. The nano-silica dispersion was mixed with 3-aminopropyltriethoxysilane and reacted at 90-100℃ for 14-16 h under nitrogen as a protective gas. After cooling, the solid was obtained by filtration. The solid was washed with toluene and vacuum dried at 55-65℃ to obtain aminated nano-silica.

[0011] 2-Bromoisobutyryl bromide and toluene were mixed at a mass ratio of (3.8–4.0):(4.1–4.3) to obtain a 2-bromoisobutyryl bromide solution. Aminated nano-silica, toluene, triethylamine and the 2-bromoisobutyryl bromide solution were mixed and reacted at -5–0°C for 2–4 h under nitrogen protection. The temperature was then raised to 25–30°C and the reaction was continued for 11–13 h. After the reaction was completed, the mixture was filtered, washed with acetone and water, and dried under vacuum at 55–65°C to obtain brominated nano-silica.

[0012] By weight, 0.57–0.59 parts of ferric chloride hexahydrate, 4.2–4.3 parts of triphenylphosphine, 4.9–5.1 parts of brominated nano-silica, 188–190 parts of N,N-dimethylformamide, and 178–180 parts of butyl acrylate were mixed and ultrasonically dispersed for 14–16 min under sealed conditions to form a mixture. 1–1.1 parts of ascorbic acid were added to the mixture, and the mixture was kept sealed and reacted at 85–95 °C for 7–9 h. After cooling, the mixture was filtered, washed with tetrahydrofuran, and vacuum dried to obtain polybutyl acrylate-brominated nano-silica. Polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine, and tetrahydrofuran were mixed and reacted at 25–30 °C and 50–70 rpm for 7–9 h. After filtration, the mixture was washed with methanol and water and vacuum dried to obtain composite modified nano-silica.

[0013] As a limitation of this invention, the preparation method of the auxiliary agent is as follows:

[0014] By weight, 2-4 parts talc, 1-3 parts paraffin, 6-8 parts antioxidant, 27-29 parts plasticizer, and 9-11 parts lead stearate are mixed evenly to obtain the additive.

[0015] As a limitation of the present invention, the mass ratio of polyvinyl chloride, polyvinylidene fluoride, composite modified nano silica and additives is (71-73):(15-17):(7-9):(3-5).

[0016] As a limitation of the present invention, the mass ratio of the nano-silica dispersion to 3-aminopropyltriethoxysilane is (25-27):(1.8-2.0).

[0017] As a limitation of the present invention, the mass ratio of the aminated nano-silica, toluene, triethylamine and 2-bromoisobutyryl bromide solution is 1:(12.4~12.6):(1.45~1.46):(8.0~8.2).

[0018] As a limitation of the present invention, the mass ratio of polybutyl acrylate-brominated nano silica, triethylamine, mercaptoethylamine and tetrahydrofuran is (9.9-10.1):(0.14-0.16):(0.11-0.13):(177-179).

[0019] The beneficial effects achieved by this invention are:

[0020] Polyvinylidene fluoride (PVDF) possesses excellent mechanical properties, thermal stability, chemical resistance, and aging resistance. Blending it with PVC significantly enhances its properties. However, the two have poor compatibility, while polybutylene acrylate (PBacrylate) exhibits good compatibility with both, allowing for more uniform dispersion of PVDF in the composite material.

[0021] Nano-silica is an inorganic non-metallic material with excellent UV resistance, mechanical properties, and chemical stability, making it suitable for improving polymers. However, its high hydrophilicity and poor compatibility with polymers necessitate modification. Common modification methods include grafting polymer-compatible groups onto the particle surface. While this can improve the dispersion of inorganic particles in the polymer to some extent, it still fails to achieve uniform dispersion. In contrast, using an organic polymer to coat inorganic particles in a core-shell structure can achieve uniform dispersion of inorganic particles within the polymer, thereby enhancing the overall performance of the composite material.

[0022] Core-shell nanoparticles, with rigid nano-silica as the core and flexible polybutyl acrylate (PB) as the shell, utilize the abundant ester groups in PB that interact with PVC, exhibiting good miscibility with PVC. The nano-silica and PB are bonded together through strong chemical interactions, effectively enhancing the strength and toughness of the composite material. Furthermore, during PVC aging, HCl is removed from structural defects. This removed HCl catalyzes hydrogen rearrangement, forming new active centers that continue to remove HCl, thus accelerating material aging. By reacting triethylamine with bromine on the surface of the core-shell nanoparticles, replacing the outer bromine layer with amino groups, core-shell nanoparticles with amino groups on their surface are obtained. These amino groups effectively bind the HCl removed during PVC aging, preventing further aging of the material. Detailed Implementation

[0023] The following are preferred embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, all other embodiments obtained by those skilled in the art without creative effort without departing from the principles of the embodiments of the present invention are within the scope of protection of the present invention.

[0024] Nano-silica (P-0447182), talc (R000973), paraffin wax (R002109), antioxidant 1010 (R150166), and plasticizer DOP (R004097) were provided by Shanghai Yi'en; polyvinyl chloride (P-0447182) and polyvinylidene fluoride (P-85140) were provided by Tianjin Xiens; polyester fabric (thickness 0.8~1.2mm) was provided by Hejian Zhengtu Hongtai; and fiberglass mesh (80~100g / m²) was provided. 2 (Provided by Anping County Chuanhang Wire Mesh Products Co., Ltd.)

[0025] Example 1: A method for preparing a high-strength PVC waterproof membrane, specifically as follows:

[0026] Step 1: Preparation of Aminated Nano-Silica

[0027] Nano-silica and toluene were mixed at a mass ratio of 1:25 and ultrasonically dispersed for 30 min to obtain a nano-silica dispersion. The nano-silica dispersion was then mixed with 3-aminopropyltriethoxysilane at a mass ratio of 26:1.9 and reacted at 95 °C for 15 h under nitrogen as a protective gas. After cooling, the mixture was filtered to obtain a solid. The solid was washed with toluene and vacuum dried at 60 °C to obtain aminated nano-silica.

[0028] Step 2: Preparation of brominated nano-silica

[0029] 2-Bromoisobutyryl bromide and toluene were mixed at a mass ratio of (3.8–4.0):(4.1–4.3) to obtain a 2-bromoisobutyryl bromide solution. Aminated nano-silica, toluene, triethylamine and the 2-bromoisobutyryl bromide solution were mixed at a mass ratio of 1:12.5:1.455:8.1. The mixture was reacted at -2°C for 3 hours under nitrogen as a protective gas. The temperature was then raised to 27°C and the reaction was continued for 12 hours. After the reaction was completed, the mixture was filtered, washed with acetone and water, and dried under vacuum at 60°C to obtain brominated nano-silica.

[0030] Step 3: Preparation of composite modified nano-silica

[0031] By weight, 0.58 parts of ferric chloride hexahydrate, 4.25 parts of triphenylphosphine, 5.0 parts of brominated nano-silica, 189 parts of N,N-dimethylformamide, and 179 parts of butyl acrylate were mixed and ultrasonically dispersed for 15 min under sealed conditions to form a mixture. 1.05 parts of ascorbic acid were added to the mixture, and the mixture was kept sealed and reacted at 90°C for 8 h. After cooling, the mixture was filtered, washed with tetrahydrofuran, and vacuum dried to obtain polybutyl acrylate-brominated nano-silica. Polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine, and tetrahydrofuran were mixed in a mass ratio of 10:0.15:0.12:178 and reacted at 27°C and 60 rpm for 8 h. After filtration, the mixture was washed with methanol and water and vacuum dried to obtain composite modified nano-silica.

[0032] Step 4: Preparation of auxiliary agents

[0033] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0034] Step 5: Prepare polyvinyl chloride roll material

[0035] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), composite modified nano-silica, and additives were mixed in a mass ratio of 72:16:8:4 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80℃, extruder temperature of 180℃, and screw speed of 20 rpm.

[0036] Step 6: Prepare high-strength PVC waterproof membrane

[0037] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0038] Example 2: A method for preparing a high-strength PVC waterproof membrane, specifically as follows:

[0039] Step 1: Preparation of Aminated Nano-Silica

[0040] Nano-silica and toluene were mixed at a mass ratio of 1:25 and ultrasonically dispersed for 30 min to obtain a nano-silica dispersion. The nano-silica dispersion was then mixed with 3-aminopropyltriethoxysilane at a mass ratio of 26:1.9 and reacted at 95 °C for 15 h under nitrogen as a protective gas. After cooling, the mixture was filtered to obtain a solid. The solid was washed with toluene and vacuum dried at 60 °C to obtain aminated nano-silica.

[0041] Step 2: Preparation of brominated nano-silica

[0042] 2-Bromoisobutyryl bromide and toluene were mixed at a mass ratio of (3.8–4.0):(4.1–4.3) to obtain a 2-bromoisobutyryl bromide solution. Aminated nano-silica, toluene, triethylamine and the 2-bromoisobutyryl bromide solution were mixed at a mass ratio of 1:12.5:1.455:8.1. The mixture was reacted at -2°C for 3 hours under nitrogen as a protective gas. The temperature was then raised to 27°C and the reaction was continued for 12 hours. After the reaction was completed, the mixture was filtered, washed with acetone and water, and dried under vacuum at 60°C to obtain brominated nano-silica.

[0043] Step 3: Preparation of composite modified nano-silica

[0044] By weight, 0.58 parts of ferric chloride hexahydrate, 4.25 parts of triphenylphosphine, 5.0 parts of brominated nano-silica, 189 parts of N,N-dimethylformamide, and 179 parts of butyl acrylate were mixed and ultrasonically dispersed for 15 min under sealed conditions to form a mixture. 1.05 parts of ascorbic acid were added to the mixture, and the mixture was kept sealed and reacted at 90℃ for 8 h. After cooling, the mixture was filtered, washed with tetrahydrofuran, and vacuum dried to obtain polybutyl acrylate-brominated nano-silica. Polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine, and tetrahydrofuran were mixed at a mass ratio of 9.9:0.14:0.11:177 and reacted at 27℃ and 60 rpm for 8 h. After filtration, the mixture was washed with methanol and water and vacuum dried to obtain composite modified nano-silica.

[0045] Step 4: Preparation of auxiliary agents

[0046] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0047] Step 5: Prepare polyvinyl chloride roll material

[0048] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), composite modified nano-silica, and additives were mixed in a mass ratio of 71:15:7:3 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80℃, extruder temperature of 180℃, and screw speed of 20 rpm.

[0049] Step 6: Prepare high-strength PVC waterproof membrane

[0050] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0051] Example 3: A method for preparing a high-strength PVC waterproof membrane, specifically as follows:

[0052] Step 1: Preparation of Aminated Nano-Silica

[0053] Nano-silica and toluene were mixed at a mass ratio of 1:25 and ultrasonically dispersed for 30 min to obtain a nano-silica dispersion. The nano-silica dispersion was then mixed with 3-aminopropyltriethoxysilane at a mass ratio of 26:1.9 and reacted at 95 °C for 15 h under nitrogen as a protective gas. After cooling, the mixture was filtered to obtain a solid. The solid was washed with toluene and vacuum dried at 60 °C to obtain aminated nano-silica.

[0054] Step 2: Preparation of brominated nano-silica

[0055] 2-Bromoisobutyryl bromide and toluene were mixed at a mass ratio of (3.8–4.0):(4.1–4.3) to obtain a 2-bromoisobutyryl bromide solution. Aminated nano-silica, toluene, triethylamine and the 2-bromoisobutyryl bromide solution were mixed at a mass ratio of 1:12.5:1.455:8.1. The mixture was reacted at -2°C for 3 hours under nitrogen as a protective gas. The temperature was then raised to 27°C and the reaction was continued for 12 hours. After the reaction was completed, the mixture was filtered, washed with acetone and water, and dried under vacuum at 60°C to obtain brominated nano-silica.

[0056] Step 3: Preparation of composite modified nano-silica

[0057] By weight, 0.58 parts of ferric chloride hexahydrate, 4.25 parts of triphenylphosphine, 5.0 parts of brominated nano-silica, 189 parts of N,N-dimethylformamide, and 179 parts of butyl acrylate were mixed and ultrasonically dispersed for 15 min under sealed conditions to form a mixture. 1.05 parts of ascorbic acid were added to the mixture, and the mixture was kept sealed and reacted at 90°C for 8 h. After cooling, the mixture was filtered, washed with tetrahydrofuran, and vacuum dried to obtain polybutyl acrylate-brominated nano-silica. Polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine, and tetrahydrofuran were mixed at a mass ratio of 10.1:0.16:0.13:179 and reacted at 27°C and 60 rpm for 8 h. After filtration, the mixture was washed with methanol and water and vacuum dried to obtain composite modified nano-silica.

[0058] Step 4: Preparation of auxiliary agents

[0059] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0060] Step 5: Prepare polyvinyl chloride roll material

[0061] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), composite modified nano-silica, and additives were mixed in a mass ratio of 73:17:9:5 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80℃, extruder temperature of 180℃, and screw speed of 20 rpm.

[0062] Step 6: Prepare high-strength PVC waterproof membrane

[0063] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0064] Based on Example 1, the following comparative experiments were conducted, specifically Comparative Example 1, Comparative Example 2, and Comparative Example 3, as described below:

[0065] Comparative Example 1: The nano-silica was not treated, and the other conditions were the same as in Example 1.

[0066] A method for preparing a high-strength PVC waterproof membrane, specifically comprising:

[0067] Step 1: Preparation of auxiliary agents

[0068] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0069] Step 2: Preparation of polyvinyl chloride roll material

[0070] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), nano-silica, and additives were mixed in a mass ratio of 72:16:8:4 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80°C, extruder temperature of 180°C, and screw speed of 20 rpm.

[0071] Step 3: Prepare high-strength PVC waterproof membrane

[0072] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0073] Comparative Example 2: Aminated nano-silica was used, and the remaining conditions were the same as in Example 1.

[0074] A method for preparing a high-strength PVC waterproof membrane, specifically comprising:

[0075] Step 1: Preparation of Aminated Nano-Silica

[0076] Nano-silica and toluene were mixed at a mass ratio of 1:25 and ultrasonically dispersed for 30 min to obtain a nano-silica dispersion. The nano-silica dispersion was then mixed with 3-aminopropyltriethoxysilane at a mass ratio of 26:1.9 and reacted at 95 °C for 15 h under nitrogen as a protective gas. After cooling, the mixture was filtered to obtain a solid. The solid was washed with toluene and vacuum dried at 60 °C to obtain aminated nano-silica.

[0077] Step 2: Preparation of auxiliary agents

[0078] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0079] Step 3: Prepare polyvinyl chloride roll material

[0080] Polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), aminated nano-silica, and additives were mixed in a mass ratio of 72:16:8:4 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80°C, extruder temperature of 180°C, and screw speed of 20 rpm.

[0081] Step 4: Prepare high-strength PVC waterproof membrane

[0082] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0083] Comparative Example 3: Unblended polyvinylidene fluoride, with other conditions as in Example 1.

[0084] A method for preparing a high-strength PVC waterproof membrane, specifically comprising:

[0085] Step 1: Preparation of Aminated Nano-Silica

[0086] Nano-silica and toluene were mixed at a mass ratio of 1:25 and ultrasonically dispersed for 30 min to obtain a nano-silica dispersion. The nano-silica dispersion was then mixed with 3-aminopropyltriethoxysilane at a mass ratio of 26:1.9 and reacted at 95 °C for 15 h under nitrogen as a protective gas. After cooling, the mixture was filtered to obtain a solid. The solid was washed with toluene and vacuum dried at 60 °C to obtain aminated nano-silica.

[0087] Step 2: Preparation of brominated nano-silica

[0088] 2-Bromoisobutyryl bromide and toluene were mixed at a mass ratio of (3.8–4.0):(4.1–4.3) to obtain a 2-bromoisobutyryl bromide solution. Aminated nano-silica, toluene, triethylamine and the 2-bromoisobutyryl bromide solution were mixed at a mass ratio of 1:12.5:1.455:8.1. The mixture was reacted at -2°C for 3 hours under nitrogen as a protective gas. The temperature was then raised to 27°C and the reaction was continued for 12 hours. After the reaction was completed, the mixture was filtered, washed with acetone and water, and dried under vacuum at 60°C to obtain brominated nano-silica.

[0089] Step 3: Preparation of composite modified nano-silica

[0090] By weight, 0.58 parts of ferric chloride hexahydrate, 4.25 parts of triphenylphosphine, 5.0 parts of brominated nano-silica, 189 parts of N,N-dimethylformamide, and 179 parts of butyl acrylate were mixed and ultrasonically dispersed for 15 min under sealed conditions to form a mixture. 1.05 parts of ascorbic acid were added to the mixture, and the mixture was kept sealed and reacted at 90°C for 8 h. After cooling, the mixture was filtered, washed with tetrahydrofuran, and vacuum dried to obtain polybutyl acrylate-brominated nano-silica. Polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine, and tetrahydrofuran were mixed in a mass ratio of 10:0.15:0.12:178 and reacted at 27°C and 60 rpm for 8 h. After filtration, the mixture was washed with methanol and water and vacuum dried to obtain composite modified nano-silica.

[0091] Step 4: Preparation of auxiliary agents

[0092] The additive is obtained by mixing 3 parts talc, 2 parts paraffin, 7 parts antioxidant 1010, 28 parts plasticizer DOP, and 10 parts lead stearate evenly by weight.

[0093] Step 5: Prepare polyvinyl chloride roll material

[0094] Polyvinyl chloride (PVC), composite modified nano-silica, and additives were mixed in a mass ratio of 72:8:4 and co-extruded through an extruder. After calendering, traction, and winding, PVC rolls were prepared. The process conditions for co-extrusion were: mixing temperature of 80℃, extruder temperature of 180℃, and screw speed of 20 rpm.

[0095] Step 6: Prepare high-strength PVC waterproof membrane

[0096] After arranging the polyester fabric, PVC roll material and fiberglass mesh in sequence, they are hot-pressed together at 160℃ and cooled to room temperature to obtain a high-strength PVC waterproof roll material.

[0097] Testing experiment:

[0098] Polyvinyl chloride (PVC) rolls were prepared according to the preparation methods in Examples 1, 2, 3, 1, 2, and 3, respectively, and placed in an environment with a temperature of 23°C and a relative humidity of 60% for 24 hours.

[0099] Mechanical performance testing: The test was conducted in accordance with the standard "Polyvinyl chloride (PVC) waterproof membrane" (GB / T 12592-2011). 150mm×50mm specimens were cut from the prepared waterproof membrane and fixed on the furniture of the tensile testing machine. The tensile testing machine was used to test each specimen in sequence to measure the tensile strength and elongation at break of each specimen.

[0100] Water absorption rate test: The test was conducted according to the standard "Polyvinyl Chloride (PVC) Waterproof Membrane" (GB / T 12592-2011). 100mm×70mm samples were cut from the prepared waterproof membrane. After drying each sample for 24 hours, the weight was measured. Then, each sample was immersed in distilled water at 70℃ for 168 hours and removed. After immersion in distilled water at 23℃ for 15 minutes, the water on the sample surface was wiped dry immediately, and the weight of each sample was measured again. The water absorption rate of each sample was calculated.

[0101] Heat aging resistance test: The test was conducted according to the standard "Polyvinyl chloride (PVC) waterproof membrane" (GB / T 12592-2011). 150mm×50mm samples were cut from the prepared waterproof membrane and placed in a hot air aging test chamber at 80℃ for 672h. After aging, the samples were placed in an environment with a temperature of 23℃ and a relative humidity of 60% for 24h. The elongation at break of each sample was then tested according to the mechanical property test method.

[0102]

[0103] Conclusion: The experiment shows that the sample in Example 1 is superior to Comparative Examples 1, 2, 3, and 4 in all aspects. The high-strength PVC waterproof membrane of the present invention is superior to ordinary PVC waterproof membranes in terms of mechanical properties, water resistance, heat aging resistance, and UV aging resistance, achieving the goal of producing a waterproof membrane with higher strength and better aging resistance.

[0104] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the spirit and principles of the present invention and within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing high strength PVC waterproofing membrane, characterized in that: The preparation method is: Polyvinyl chloride, polyvinylidene fluoride, composite modified nano-silica and auxiliary agents are mixed and blended and extruded through an extruder, and then polyvinyl chloride coiled material is prepared through calendering, traction and winding, wherein the mixing temperature is 70-90 DEG C, the extrusion temperature is 170-190 DEG C, and the screw rotation speed is 10-30 rpm; After arranging the polyester cloth, polyvinyl chloride coiled material and glass fiber mesh in the order of arrangement, hot pressing is carried out at 145-180 DEG C to obtain high-strength PVC waterproof coiled material after cooling to room temperature. The preparation method of the composite modified nano-silica is: Nano-silica and toluene are mixed at a mass ratio of 1:(24-26), ultrasonic dispersion is carried out for 20-40 min to obtain nano-silica dispersion liquid, the nano-silica dispersion liquid is mixed with 3-aminopropyl triethoxysilane, reaction is carried out at 90-100 DEG C for 14-16 h under the protection of nitrogen, and then the solid is obtained by filtration, washed with toluene and vacuum dried at 55-65 DEG C to obtain aminated nano-silica. 2-bromoisobutyryl bromide and toluene are mixed at a mass ratio of (3.8-4.0):(4.1-4.3) to obtain 2-bromoisobutyryl bromide solution, the aminated nano-silica, toluene, triethylamine and 2-bromoisobutyryl bromide solution are mixed, reaction is carried out at-5-0 DEG C for 2-4 h under the protection of nitrogen, the temperature is increased to 25-30 DEG C, and then the reaction is continued for 11-13 h, after the reaction is completed, filtration is carried out, washing is carried out with acetone and water, and vacuum drying is carried out at 55-65 DEG C to obtain brominated nano-silica. 0.57-0.59 parts of iron chloride hexahydrate, 4.2-4.3 parts of triphenylphosphine, 4.9-5.1 parts of brominated nano-silica, 188-190 parts of N,N-dimethylformamide and 178-180 parts of butyl acrylate are mixed, ultrasonic dispersion is carried out for 14-16 min under a closed condition to form a mixed liquid, 1-1.1 parts of ascorbic acid is added to the mixed liquid, the reaction is carried out at 85-95 DEG C for 7-9 h under a closed condition, cooling is carried out, filtration is carried out, washing is carried out with tetrahydrofuran, and vacuum drying is carried out to obtain polybutyl acrylate-brominated nano-silica, the polybutyl acrylate-brominated nano-silica, triethylamine, mercaptoethylamine and tetrahydrofuran are mixed, the reaction is carried out at 25-30 DEG C for 7-9 h under 50-70 rpm, filtration is carried out, washing is carried out with methanol and water, and vacuum drying is carried out to obtain composite modified nano-silica.

2. The method for preparing high-strength PVC waterproof coiled material according to claim 1, characterized in that: The auxiliary agent is composed of talc, paraffin, antioxidant, plasticizer and lead stearate.

3. The method for preparing high-strength PVC waterproofing membrane according to claim 1, characterized in that: The mass ratio of polyvinyl chloride, polyvinylidene fluoride, composite modified nano-silica and auxiliary agent is (71-73):(15-17):(7-9):(3-5).

4. The method for preparing high-strength PVC waterproofing membrane according to claim 1, characterized in that: The mass ratio of nano-silica dispersion liquid and 3-aminopropyl triethoxysilane is (25-27):(1.8-2.0).

5. The method for preparing a high-strength PVC waterproof membrane according to claim 1, characterized in that: The mass ratio of aminated nano-silica, toluene, triethylamine and 2-bromoisobutyryl bromide solution is 1:(12.4-12.6):(1.45-1.46):(8.0-8.2).

6. The method for preparing a high-strength PVC waterproof membrane according to claim 1, characterized in that: The mass ratio of polybutyl acrylate - nano-silica bromide, triethylamine, mercaptoethylamine and tetrahydrofuran is (9.9-10.1):(0.14-0.16):(0.11-0.13):(177-179).

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