Anti-permeability durable prefabricated assembled concrete reverse ridge and processing technology thereof

Abstract

The present application relates to the technical field of building engineering, in particular to a kind of anti-permeability durable prefabricated assembly type concrete counter-slope and its processing technology.The present application solves the problems of difficult formwork on site, easy deviation of mould by producing prefabricated counter-slope, improves the precision of counter-slope size and the surface forming quality, the high-quality counter-slope product is directly transported to the site for installation, solves the problem of long protection time of cast-in-place counter-slope finished product, reduces the later repair work, in the application scenarios of city renewal, building function reconstruction, space variable reconstruction, flat epidemic combination reconstruction, etc., the assembly type counter-slope can be flexibly adjusted and assembled, the dismantled assembly type counter-slope can be recycled and reused, has good compatibility with assembly type partition wall of different thickness, improves the industrialization and assembly type construction level, improves the construction speed, and has excellent environmental protection.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a waterproof and durable precast concrete inverted wall and its processing technology. Background Technology

[0002] Concrete retaining walls are typically installed at the base of walls in rooms exposed to water, cast integrally with the floor slab. Their primary purpose is to block water seepage and prevent moisture from penetrating the upper part of the wall and adjacent rooms. Traditionally, the retaining wall formwork is suspended, leading to difficulties in fixing it and potential for misalignment under stress. Furthermore, the concrete at the top often suffers from poor pouring quality and surface finish, coupled with a long curing period, resulting in extensive repairs and rework later on. This increases both construction costs and time, a persistent challenge in the construction industry. In practical applications such as urban renewal, building function renovation, flexible space transformation, and combined peacetime and epidemic prevention renovations, traditional methods lack flexibility and ease of construction, with extensive wet work being a major drawback in construction renovation projects.

[0003] Therefore, we propose a seepage-resistant and durable precast concrete inverted wall and its processing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a seepage-resistant and durable precast concrete inverted wall and its processing technology to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A processing technology for a seepage-resistant and durable precast assembled concrete inverted curb includes the following steps:

[0007] Step a: Production of precast curbs: The factory designs molds based on the detailed curb drawings, mass-produces the curbs according to the drawings, and transports them to the construction site;

[0008] Step b: Installation of the inverted curb: Roughen the floor slab surface to be installed with the inverted curb, clean the surface dust and wet it, then lay waterproof mortar, pour the inverted curb and concrete floor slab to form an L-shaped structural layer, and use a rubber mallet to tap the top surface of the inverted curb to compact the mortar. At the tongue and groove joints at both ends of the inverted curb, pour waterproof mortar and compact it.

[0009] Step c: Construction of anti-cracking reinforcement layer: The inside corner between the concrete floor slab and the curb is cast into a rounded corner. An anti-cracking reinforcement layer is added to the vertical joint and the horizontal joint with the floor slab of the prefabricated assembled curb. The preparation steps of the anti-cracking reinforcement layer are as follows: Cement mortar slope layer, in sequence, a first waterproof layer, a middle polyester cloth, a second waterproof layer and a finishing layer are laid; Cement mortar leveling layer, in sequence, a first waterproof layer, a middle alkali-resistant fiberglass mesh, a second waterproof layer and a finishing layer are laid.

[0010] Furthermore, the precast inverted curb is formed by binding four longitudinal steel bars with a diameter of 10mm and stirrups with a diameter of 6mm and a spacing of 200mm to form a rectangular steel skeleton, and concrete is poured on the outside to form a concrete curb body; a round-headed hanging nail is set at 1 / 5 to 1 / 4 of the length from the end of the curb; a PVC pipe with a diameter of 100mm is set in the middle of the curb body along the length direction, which is cut off at the hanging nail and sealed at both ends to form a closed cavity inside the curb body.

[0011] Furthermore, the waterproof layer comprises the following components by weight: 45-95 parts polyurethane emulsion, 3-5 parts film-forming aid, 0.3-0.5 parts defoamer, 0.1-0.3 parts leveling agent, 5-15 parts titanium dioxide, 10-30 parts modified calcium carbonate, and 20-40 parts quartz sand.

[0012] Furthermore, the preparation method of the polyurethane emulsion is as follows:

[0013] Modified polyester, sulfonate-grafted polyester diol, polyether polyol, and antioxidant are mixed evenly and vacuum dehydrated at 110-120℃ for 2-3 hours. The mixture is then cooled to 80-90℃, and under nitrogen protection, isophorone diisocyanate and dibutyltin dilaurate are added and mixed evenly. The mixture is reacted for 3-5 hours, followed by the addition of 2,2-dimethylolbutyric acid and acetone, and the reaction is continued for 3-5 hours. The mixture is then cooled to 30-40℃, and triethylamine is added for neutralization. Deionized water is then added for emulsification. The solvent acetone is removed under vacuum to obtain a polyurethane emulsion.

[0014] Furthermore, the polyurethane emulsion comprises the following components by weight: 30-40 parts modified polyester, 5-15 parts sulfonate-grafted polyester diol, 10-20 parts polyether polyol, 70-80 parts isophorone diisocyanate, 1-3 parts dibutyltin dilaurate, 2-4 parts 2,2-dimethylolbutyric acid, 0.2-0.5 parts triethylamine, 0.1-0.4 parts antioxidant, and 80-100 parts deionized water.

[0015] Furthermore, the modified polyester is prepared as follows:

[0016] Step 1: Under nitrogen protection, itaconic acid, succinic acid, ethylene glycol, isosorbide, hydroquinone and tetrabutyl titanate are mixed evenly and reacted at 160-170℃ for 2-3 hours. The vacuum degree of the system is controlled at 0.09MPa and the reaction is carried out at 160-170℃ for 5-7 hours. After cooling to room temperature, the product is purified and dried to obtain a polyester containing double bonds.

[0017] Step 2: Under nitrogen protection, castor oil and 3-mercaptopropionic acid are mixed evenly, p-toluenesulfonic acid and p-hydroxyanisole are added, and the mixture is reacted at 80-90℃ for 20-24 hours. After washing and drying, castor oil-based thiol monomer is obtained.

[0018] Step 3: Under nitrogen protection, octamethylcyclotetrasiloxane, pentamethylpentylcyclopentasiloxane and trifluoropropyltrimethylcyclotrisiloxane are mixed evenly, heated to 100-110℃, tetramethylammonium hydroxide and deionized water are added and mixed evenly, reacted for 3-5 hours, heated to 145-150℃ and kept at this temperature for 2-3 hours, and after vacuum distillation, hydroxyl-terminated fluorinated vinyl polysiloxane is obtained;

[0019] Step 4: Mix the double-bonded polyester, hydroxyl-terminated fluorinated vinyl polysiloxane and castor oil-based thiol monomer evenly, add a photoinitiator, and irradiate with ultraviolet light for 30-60 minutes to obtain the modified polyester.

[0020] In the above technical solution, step 1 uses bio-based monomers itaconic acid, succinic acid, ethylene glycol, and isosorbide as raw materials to prepare a double-bond-containing polyester through melt polycondensation; step 2 uses castor oil and 3-mercaptopropionic acid as raw materials to prepare a UV-curable bio-based monomer, namely castor oil-based thiol monomer, with hydrophobic properties, through a simple and green process; step 3 uses deionized water as a capping agent and tetramethylammonium hydroxide as a catalyst to introduce double bonds through the reaction of octamethylcyclotetrasiloxane, trifluoropropyltrimethylcyclotrisiloxane, and pentamethylpentavinylcyclopentasiloxane to obtain hydroxyl-terminated fluorinated vinyl polysiloxane, which has high viscosity and good hydrophobic properties; step 4 uses double-bond-containing polyester, hydroxyl-terminated fluorinated vinyl polysiloxane, and castor oil-based thiol monomer as raw materials to prepare a modified polyester through a mercapto-olefin click reaction, which contains a large number of hydroxyl groups that can participate in the synthesis of polyurethane to form a strong chemical cross-linking structure, giving polyurethane excellent waterproof and mechanical properties.

[0021] Furthermore, in step 1, the double-bond-containing polyester comprises the following weight components: 15-18 parts itaconic acid, 6-8 parts succinic acid, 15-20 parts ethylene glycol, 5-8 parts isosorbide, 0.01-0.03 parts hydroquinone, and 0.01-0.03 parts tetrabutyl titanate.

[0022] Furthermore, the mass ratio of octamethylcyclotetrasiloxane, pentamethylpentylcyclopentasiloxane, and trifluoropropyltrimethylcyclotrisiloxane is 1:(1.0-1.2):(2.0-2.2), the mass of tetramethylammonium hydroxide is 0.03-0.05% of the mass of trifluoropropyltrimethylcyclotrisiloxane, and the mass of deionized water is 0.1-0.3% of the mass of trifluoropropyltrimethylcyclotrisiloxane.

[0023] Furthermore, the mass ratio of castor oil, 3-mercaptopropionic acid, p-toluenesulfonic acid, and p-hydroxyanisole is 1:(0.35-0.40):(0.1-0.3):(0.01-0.03).

[0024] Furthermore, the mass ratio of the double-bonded polyester, the hydroxyl-terminated fluorinated vinyl polysiloxane, and the castor oil-based thiol monomer is 1:(0.3-0.5):(1-2):(0.1-0.3).

[0025] Furthermore, the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0026] Furthermore, the process conditions for ultraviolet irradiation are: irradiation wavelength 360-400nm, irradiation intensity 20-25mW / cm². 2 .

[0027] Furthermore, the preparation method of the modified calcium carbonate is as follows:

[0028] Calcium carbonate and maleic anhydride are mixed and stirred at 90-120℃ for 0.5-1h to obtain calcium carbonate-maleic anhydride; calcium carbonate-maleic anhydride is mixed evenly with modified polyester at 20-25℃, tetrabutyl titanate is added, and the mixture is heated to 150-170℃ and stirred for 0.5-1h to obtain modified calcium carbonate.

[0029] Furthermore, the mass ratio of calcium carbonate to maleic anhydride is 1:(0.3-0.5).

[0030] Furthermore, the mass ratio of calcium carbonate-maleic anhydride, modified polyester, and tetrabutyl titanate is 1:(0.2-0.8):(0.03-0.05).

[0031] Furthermore, the thickness of the waterproof layer is 1.5 mm.

[0032] Furthermore, the finishing layer uses 10mm thick anti-slip floor tiles.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This invention relates to a waterproof and durable precast concrete upstand and its processing technology. By producing precast upstands, the problems of difficult on-site formwork and easy mold misalignment are solved, while improving the dimensional accuracy and surface forming quality of the upstands. High-quality upstand products are directly transported to the site for installation, solving the problem of long protection time for cast-in-place upstands and reducing subsequent repair work. In application scenarios such as urban renewal, building function transformation, space variable transformation, and combined peacetime and epidemic prevention transformation, the precast upstands can be flexibly adjusted and assembled. The dismantled precast upstands can be recycled and reused. It has good compatibility with precast partitions of different thicknesses (such as ALC and light steel keel partitions), improves the level of industrialization and precast construction, increases construction speed, and has excellent environmental protection properties.

[0035] 2. The present invention relates to a waterproof and durable precast concrete inverted wall and its processing technology. By introducing modified polyester and sulfonate-grafted polyester diol into the polyurethane emulsion, it not only improves the hydrolysis resistance, strength and wear resistance of the film after film formation, enabling the waterproof coating to maintain its integrity and functionality during long-term use, but also endows the emulsion with excellent mechanical stability and compatibility with cement-based materials. Modified calcium carbonate acts as a functional filler in the polyurethane waterproof layer. Its surface organic long chains (polyester grafting) are entangled or covalently bonded with the polyurethane molecular chains, which significantly enhances the interfacial adhesion between the filler and the matrix, further improving the mechanical strength, crack resistance and durability of the waterproof coating. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the prefabricated inverted wall structure in this invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and 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.

[0039] Unless otherwise specified, all quantities below are by weight. It should be noted that there are no special restrictions on the suppliers of any of the raw materials involved in this invention. Exemplary examples include: waterproof mortar: M7.5; sulfonate-grafted polyester diol: BY-3306 (Mn=500), purchased from Beijing Baiyuan Chemical Co., Ltd.; polyether polyol: CP450, sourced from Dow Chemical; film-forming aid: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate; quartz sand: purchased from Henan Minghai Environmental Protection Technology Co., Ltd.; calcium carbonate: purchased from Lingshou County Dehang Mineral Products Co., Ltd.; titanium dioxide: Chemours Ti-Pure™ R-902+; leveling agent: Keying KYC-615; defoamer: BYK-028; antioxidant: antioxidant 1010; polyester fabric: 200g / m². 2 Alkali-resistant fiberglass mesh: 180g / m 2 .

[0040] Example 1: A seepage-resistant and durable precast concrete inverted retaining wall and its processing technology, comprising the following steps:

[0041] Step a: Production of precast curbs: The factory designs molds based on the detailed curb drawings, mass-produces the curbs according to the drawings, and transports them to the construction site;

[0042] Step b: Installation of the inverted curb: Roughen the floor slab surface to be installed with the inverted curb, clean the surface dust and moisten it, then lay waterproof mortar, pour the inverted curb and concrete floor slab to form an L-shaped structural layer, and use a rubber mallet to tap the top surface of the inverted curb to compact the mortar, until the mortar squeezes out 10mm on both sides of the bottom of the curb, and no more mortar squeezes out. Fill the tongue and groove joints at both ends of the inverted curb with waterproof mortar and compact it.

[0043] Step c: Construction of anti-cracking reinforcement layer: The inside corner between the concrete floor slab and the curb is cast into a rounded corner. An anti-cracking reinforcement layer is added to the vertical joint and the horizontal joint with the floor slab of the prefabricated inverted curb. The preparation steps of the anti-cracking reinforcement layer are as follows: Cement mortar slope layer, in sequence, a first waterproof layer, a middle polyester cloth, a second waterproof layer and a finishing layer are laid; Cement mortar leveling layer, in sequence, a first waterproof layer, a middle alkali-resistant fiberglass mesh, a second waterproof layer and a finishing layer are laid.

[0044] The waterproof layer comprises the following components by weight: 45 parts polyurethane emulsion, 3 parts film-forming aid, 0.3 parts defoamer, 0.1 parts leveling agent, 5 parts titanium dioxide, 10 parts modified calcium carbonate, and 20 parts quartz sand.

[0045] The preparation method of polyurethane emulsion is as follows:

[0046] 30 parts of modified polyester, 5 parts of sulfonate-grafted polyester diol, 10 parts of polyether polyol and 0.1 parts of antioxidant were mixed evenly and dehydrated under vacuum at 110°C for 2 hours. The mixture was then cooled to 80°C and, under nitrogen protection, 70 parts of isophorone diisocyanate and 1 part of dibutyltin dilaurate were added and mixed evenly. The mixture was reacted for 3 hours. Then, 2 parts of 2,2-dimethylolbutyric acid and 40 parts of acetone were added and reacted for 3 hours. The mixture was cooled to 30°C and 0.2 parts of triethylamine were added for neutralization. Finally, 100 parts of deionized water were added for emulsification. The solvent acetone was removed under vacuum to obtain a polyurethane emulsion.

[0047] The preparation method of modified polyester is as follows:

[0048] Step 1: Under nitrogen protection, 15 parts itaconic acid, 6 parts succinic acid, 15 parts ethylene glycol, 5 parts isosorbide, 0.01 parts hydroquinone and 0.01 parts tetrabutyl titanate were mixed evenly and reacted at 160℃ for 2 hours. The vacuum degree of the system was controlled at 0.09 MPa and the reaction was carried out at 160℃ for 5 hours. After cooling to room temperature, the product was purified and dried to obtain a polyester containing double bonds.

[0049] Step 2: Under nitrogen protection, 30 parts castor oil and 10.5 parts 3-mercaptopropionic acid were mixed evenly, 3 parts p-toluenesulfonic acid and 0.03 parts p-hydroxyanisole were added, and the mixture was reacted at 80°C for 20 hours. After washing and drying, castor oil-based thiol monomer was obtained.

[0050] Step 3: Under nitrogen protection, 10 parts of octamethylcyclotetrasiloxane, 10 parts of pentamethylpentylcyclopentasiloxane and 20 parts of trifluoropropyltrimethylcyclotrisiloxane were mixed evenly, heated to 100°C, 0.006 parts of tetramethylammonium hydroxide and 0.02 parts of deionized water were added and mixed evenly. The mixture was reacted for 3 hours, and the temperature was further increased to 145°C and held for 2 hours. After vacuum distillation, hydroxyl-terminated fluorinated vinyl polysiloxane was obtained.

[0051] Step 4: Mix 30 parts of double-bonded polyester, 9 parts of hydroxyl-terminated fluorinated vinyl polysiloxane, and 30 parts of castor oil-based thiol monomer evenly, add 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and irradiate with ultraviolet light for 30 minutes at a wavelength of 360 nm and an irradiation intensity of 20 mW / cm². 2 Modified polyester was obtained;

[0052] The preparation method of modified calcium carbonate is as follows:

[0053] Mix 10 parts calcium carbonate with 3 parts maleic anhydride and stir at 90°C for 0.5 h to obtain calcium carbonate-maleic anhydride; mix 10 parts calcium carbonate-maleic anhydride with 2 parts modified polyester at 20°C, add 0.3 parts tetrabutyl titanate, heat to 150°C and stir for 0.5 h to obtain modified calcium carbonate.

[0054] Example 2: A seepage-resistant and durable precast concrete inverted retaining wall and its processing technology, including the following steps:

[0055] Step a: Production of precast curbs: The factory designs molds based on the detailed curb drawings, mass-produces the curbs according to the drawings, and transports them to the construction site;

[0056] Step b: Installation of the inverted curb: Roughen the floor slab surface to be installed with the inverted curb, clean the surface dust and moisten it, then lay waterproof mortar, pour the inverted curb and concrete floor slab to form an L-shaped structural layer, and use a rubber mallet to tap the top surface of the inverted curb to compact the mortar, until 11mm of mortar is squeezed out on both sides of the bottom of the curb, and no more mortar is squeezed out. Fill the tongue and groove joints at both ends of the inverted curb with waterproof mortar and compact it.

[0057] Step c: Construction of anti-cracking reinforcement layer: The inside corner between the concrete floor slab and the curb is cast into a rounded corner. An anti-cracking reinforcement layer is added to the vertical joint and the horizontal joint with the floor slab of the prefabricated inverted curb. The preparation steps of the anti-cracking reinforcement layer are as follows: Cement mortar slope layer, in sequence, a first waterproof layer, a middle polyester cloth, a second waterproof layer and a finishing layer are laid; Cement mortar leveling layer, in sequence, a first waterproof layer, a middle alkali-resistant fiberglass mesh, a second waterproof layer and a finishing layer are laid.

[0058] The waterproof layer comprises the following components by weight: 75 parts polyurethane emulsion, 4 parts film-forming aid, 0.4 parts defoamer, 0.2 parts leveling agent, 10 parts titanium dioxide, 20 parts modified calcium carbonate, and 30 parts quartz sand.

[0059] The preparation method of polyurethane emulsion is as follows:

[0060] 35 parts of modified polyester, 10 parts of sulfonate-grafted polyester diol, 15 parts of polyether polyol and 0.3 parts of antioxidant were mixed evenly and vacuum dehydrated at 115℃ for 2.5h. The mixture was then cooled to 85℃ and, under nitrogen protection, 80 parts of isophorone diisocyanate and 2 parts of dibutyltin dilaurate were added and mixed evenly. The mixture was reacted for 4h, then 3 parts of 2,2-dimethylolbutyric acid and 40 parts of acetone were added and reacted for 4h. The mixture was cooled to 35℃ and 0.3 parts of triethylamine were added for neutralization. Then, 90 parts of deionized water were added for emulsification. The solvent acetone was removed under vacuum to obtain a polyurethane emulsion.

[0061] The preparation method of modified polyester is as follows:

[0062] Step 1: Under nitrogen protection, 16 parts itaconic acid, 7 parts succinic acid, 18 parts ethylene glycol, 7 parts isosorbide, 0.02 parts hydroquinone and 0.02 parts tetrabutyl titanate were mixed evenly and reacted at 165℃ for 2.5h. The vacuum degree of the system was controlled at 0.09MPa and the reaction was carried out at 165℃ for 6h. After cooling to room temperature, the product was purified and dried to obtain a polyester containing double bonds.

[0063] Step 2: Under nitrogen protection, 50 parts castor oil and 20 parts 3-mercaptopropionic acid were mixed evenly, 5 parts p-toluenesulfonic acid and 0.5 parts p-hydroxyanisole were added, and the mixture was reacted at 85°C for 22 hours. After washing and drying, castor oil-based thiol monomer was obtained.

[0064] Step 3: Under nitrogen protection, 14 parts of octamethylcyclotetrasiloxane, 15.4 parts of pentamethylpentylcyclopentasiloxane and 29 parts of trifluoropropyltrimethylcyclotrisiloxane were mixed evenly, heated to 105°C, 0.01 parts of tetramethylammonium hydroxide and 0.087 parts of deionized water were added and mixed evenly. The mixture was reacted for 4 hours, and then the temperature was raised to 148°C and held for 2.5 hours. After vacuum distillation, hydroxyl-terminated fluorinated vinyl polysiloxane was obtained.

[0065] Step 4: Mix 35 parts of double-bonded polyester, 14 parts of hydroxyl-terminated fluorinated vinyl polysiloxane, and 50 parts of castor oil-based thiol monomer evenly, add 7 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and irradiate with ultraviolet light for 50 minutes at a wavelength of 380 nm and an irradiation intensity of 24 mW / cm². 2 Modified polyester was obtained;

[0066] The preparation method of modified calcium carbonate is as follows:

[0067] 20 parts of calcium carbonate and 8 parts of maleic anhydride were mixed and stirred at 100°C for 0.8 h to obtain calcium carbonate-maleic anhydride; 20 parts of calcium carbonate-maleic anhydride were mixed evenly with 10 parts of modified polyester at 22°C, 0.8 parts of tetrabutyl titanate were added, and the mixture was heated to 160°C and stirred for 0.8 h to obtain modified calcium carbonate.

[0068] Example 3: A seepage-resistant and durable precast concrete inverted retaining wall and its processing technology, including the following steps:

[0069] Step a: Production of precast curbs: The factory designs molds based on the detailed curb drawings, mass-produces the curbs according to the drawings, and transports them to the construction site;

[0070] Step b: Installation of the inverted curb: Roughen the floor slab surface to be installed with the inverted curb, clean the surface dust and moisten it, then lay waterproof mortar, pour the inverted curb and concrete floor slab to form an L-shaped structural layer, and use a rubber mallet to tap the top surface of the inverted curb to compact the mortar, until 12mm of mortar is squeezed out on both sides of the bottom of the curb, and no more mortar is squeezed out. Fill the tongue and groove joints at both ends of the inverted curb with waterproof mortar and compact it.

[0071] Step c: Construction of anti-cracking reinforcement layer: The inside corner between the concrete floor slab and the curb is cast into a rounded corner. An anti-cracking reinforcement layer is added to the vertical joint and the horizontal joint with the floor slab of the prefabricated inverted curb. The preparation steps of the anti-cracking reinforcement layer are as follows: Cement mortar slope layer, in sequence, a first waterproof layer, a middle polyester cloth, a second waterproof layer and a finishing layer are laid; Cement mortar leveling layer, in sequence, a first waterproof layer, a middle alkali-resistant fiberglass mesh, a second waterproof layer and a finishing layer are laid.

[0072] The waterproof layer comprises the following components by weight: 95 parts polyurethane emulsion, 5 parts film-forming aid, 0.5 parts defoamer, 0.3 parts leveling agent, 15 parts titanium dioxide, 30 parts modified calcium carbonate, and 40 parts quartz sand.

[0073] The preparation method of polyurethane emulsion is as follows:

[0074] 40 parts of modified polyester, 15 parts of sulfonate-grafted polyester diol, 20 parts of polyether polyol and 0.4 parts of antioxidant were mixed evenly and vacuum dehydrated at 120℃ for 3 hours. The mixture was then cooled to 90℃ and, under nitrogen protection, 90 parts of isophorone diisocyanate and 3 parts of dibutyltin dilaurate were added and mixed evenly. The mixture was reacted for 5 hours. Then, 4 parts of 2,2-dimethylolbutyric acid and 40 parts of acetone were added and reacted for 5 hours. The mixture was cooled to 40℃ and 0.5 parts of triethylamine were added for neutralization. Then, 100 parts of deionized water were added for emulsification. The solvent acetone was removed under vacuum to obtain a polyurethane emulsion.

[0075] The preparation method of modified polyester is as follows:

[0076] Step 1: Under nitrogen protection, 18 parts itaconic acid, 8 parts succinic acid, 20 parts ethylene glycol, 8 parts isosorbide, 0.03 parts hydroquinone and 0.03 parts tetrabutyl titanate were mixed evenly and reacted at 170°C for 3 hours. The vacuum degree of the system was controlled at 0.09 MPa and the reaction was carried out at 170°C for 7 hours. After cooling to room temperature, the product was purified and dried to obtain a polyester containing double bonds.

[0077] Step 2: Under nitrogen protection, 80 parts of castor oil and 32 parts of 3-mercaptopropionic acid were mixed evenly, and 24 parts of p-toluenesulfonic acid and 2.4 parts of p-hydroxyanisole were added. The mixture was reacted at 90°C for 24 hours. After washing and drying, castor oil-based thiol monomer was obtained.

[0078] Step 3: Under nitrogen protection, 20 parts of octamethylcyclotetrasiloxane, 24 parts of pentamethylpentylcyclopentasiloxane and 44 parts of trifluoropropyltrimethylcyclotrisiloxane were mixed evenly, heated to 110°C, 0.022 parts of tetramethylammonium hydroxide and 0.13 parts of deionized water were added and mixed evenly. The mixture was reacted for 5 hours, and then the temperature was raised to 150°C and held for 3 hours. After vacuum distillation, hydroxyl-terminated fluorinated vinyl polysiloxane was obtained.

[0079] Step 4: Mix 40 parts of double-bonded polyester, 20 parts of hydroxyl-terminated fluorinated vinyl polysiloxane, and 80 parts of castor oil-based thiol monomer evenly, add 12 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, and irradiate with ultraviolet light for 60 minutes at a wavelength of 400 nm and an irradiation intensity of 25 mW / cm². 2 Modified polyester was obtained;

[0080] The preparation method of modified calcium carbonate is as follows:

[0081] 30 parts of calcium carbonate and 15 parts of maleic anhydride were mixed and stirred at 120°C for 1 hour to obtain calcium carbonate-maleic anhydride; 30 parts of calcium carbonate-maleic anhydride were mixed evenly with 24 parts of modified polyester at 25°C, tetrabutyl titanate was added, and the mixture was heated to 170°C and stirred for 1 hour to obtain modified calcium carbonate.

[0082] Comparative Example 1: Compared with Example 2, Comparative Example 1 used a commercially available polyurethane emulsion (model F12-0301, purchased from Shenzhen Yoshida Chemical Co., Ltd.) as the waterproof layer, and the other steps were the same as in Example 2.

[0083] Comparative Example 2: Compared with Example 2, the modified polyester in Comparative Example 2 was replaced with the same mass of double-bonded polyester, and the other steps were the same as in Example 2.

[0084] Comparative Example 3: Compared with Example 2, Comparative Example 3 replaced the modified calcium carbonate with the same mass of calcium carbonate, and the other steps were the same as in Example 2.

[0085] Experiment: The waterproof layers obtained in Examples 1-3 and Comparative Examples 1-3 were tested for their performance, and the test results were recorded.

[0086] The water contact angle was measured using a JC2000DM contact angle meter with a volume of 2 μL of deionized water. The tensile strength was tested according to Chapter 9 of GB / T16777-2008 at a tensile speed of 500 mm / min. The bond strength was tested according to Method A in 7.1 of GB / T16777-2008. The test results are shown in Table 1.

[0087] Table 1

[0088]

[0089] Based on the data in the table above, the following conclusions can be clearly drawn: Compared with comparative examples 1-3, the waterproof layer prepared in examples 1-3 of the present invention has excellent hydrophobicity and mechanical properties, thereby extending the service life of the material.

[0090] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process method article or apparatus.

[0091] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A process for the manufacture of a durable, impermeable, prefabricated concrete counter-cant, characterized in that: It comprises the following steps: Step a: producing prefabricated reverse ridge: the factory designs a mold according to the reverse ridge deepening drawing, produces the reverse ridge in batches according to the drawing, and transports it to the construction site; Step b: reverse ridge installation: chisel the floor surface to be installed with the reverse ridge, clean the surface dust and wet it, then lay waterproof mortar, pour the reverse ridge and the concrete floor to form an integral structure, form an L-shaped structure layer, and knock the top surface of the reverse ridge with a rubber hammer to compact the mortar, and pour waterproof mortar into the joint at both ends of the reverse ridge and compact it; Step c: making a crack-resistant reinforcing layer: the inside corner between the concrete floor and the reverse ridge is poured into a round corner, and the prefabricated reverse ridge is additionally provided with a crack-resistant reinforcing layer at the joint vertical seam and the horizontal seam with the floor; the preparation steps of the crack-resistant reinforcing layer are as follows: a cement mortar leveling layer, a first waterproof layer, an intermediate polyester cloth, a second waterproof layer and a finishing layer are sequentially laid; or a cement mortar leveling layer, a first waterproof layer, an intermediate alkali-resistant glass fiber mesh cloth, a second waterproof layer and a finishing layer are sequentially laid; The waterproof layer comprises the following components by weight: 45-75 parts of polyurethane emulsion, 3-5 parts of film forming aid, 0.3-0.5 parts of defoaming agent, 0.1-0.3 parts of leveling agent, 5-15 parts of titanium white, 10-30 parts of modified calcium carbonate and 20-40 parts of quartz sand; The preparation method of the polyurethane emulsion is as follows: Mix the modified polyester, sulfonate grafted polyester diol, polyether polyol and antioxidant uniformly, vacuum dehydrate at 110-120℃ for 2-3h, cool to 80-90℃, add isophorone diisocyanate and dibutyltin dilaurate under nitrogen protection, mix uniformly, react for 3-5h, add 2,2-dimethylol butyric acid and acetone, react for 3-5h, cool to 30-40℃, add triethylamine for neutralization, then add deionized water for emulsification, remove the solvent acetone by vacuum extraction, and obtain the polyurethane emulsion; The preparation method of the modified polyester is as follows: Step 1: mix itaconic acid, succinic acid, ethylene glycol, isosorbide, hydroquinone and tetrabutyl titanate uniformly under nitrogen protection, react at 160-170℃ for 2-3h, control the vacuum degree of the system to 0.09MPa, react at 160-170℃ for 5-7h, cool to room temperature, purify and dry to obtain a double-bond-containing polyester; Step 2: mix castor oil and 3-mercapto propionic acid uniformly under nitrogen protection, add p-toluenesulfonic acid and p-hydroxyanisole, react at 80-90℃ for 20-24h, wash and dry to obtain a castor oil-based mercaptan monomer; Step 3: mix octamethylcyclotetrasiloxane, pentamethylpentavinylcyclopentasiloxane and trifluoropropyltrimethylcyclotrisiloxane uniformly under nitrogen protection, heat to 100-110℃, mix tetramethylammonium hydroxide and deionized water uniformly, react for 3-5h, continue to heat to 145-150℃, keep warm for 2-3h, distill under reduced pressure to obtain a hydroxyl-terminated fluorine-containing vinyl polysiloxane; Step 4: mix the double-bond-containing polyester, the hydroxyl-terminated fluorine-containing vinyl polysiloxane and the castor oil-based mercaptan monomer uniformly, add a photoinitiator, irradiate under ultraviolet light for 30-60min to obtain a modified polyester.

2. The processing technology of the anti-permeability durable prefabricated assembled concrete counter-cant according to claim 1, characterized in that: The prefabricated inverted dam is formed by binding a rectangular steel framework with four longitudinal through steel bars with a diameter of 10 mm and stirrups with a diameter of 6 mm and a spacing of 200 mm, and pouring concrete outside the steel framework to form a concrete dam body; a round head lifting peg is arranged at a distance of 1 / 5 to 1 / 4 of the length of the dam end; a PVC pipe with a diameter of 100 mm is arranged along the length direction in the middle of the dam body, the pipe is cut at the lifting peg and sealed at both ends to form a closed cavity in the dam body.

3. The processing technology of the anti-permeability durable prefabricated assembled concrete counter-cant according to claim 1, characterized in that: The double-bond-containing polyester comprises the following components by weight: itaconic acid 15-18 parts, succinic acid 6-8 parts, ethylene glycol 15-20 parts, isosorbide 5-8 parts, p-benzenediol 0.01-0.03 parts, and tetrabutyl titanate 0.01-0.03 parts.

4. The processing technology of the anti-permeability durable prefabricated assembled concrete counter-cant according to claim 1, characterized in that: The mass ratio of the double-bond-containing polyester, the hydroxyl-terminated fluorine-containing vinyl polysiloxane and the castor oil-based mercaptan monomer is 1:(0.3-0.5):(1-2):(0.1-0.3).

5. The processing technology of the anti-permeability durable prefabricated assembled concrete counter-cant according to claim 1, characterized in that: The preparation method of the modified calcium carbonate is as follows: The calcium carbonate is mixed with maleic anhydride and stirred at 90-120 DEG C for 0.5-1 h to obtain calcium carbonate-maleic anhydride; the calcium carbonate-maleic anhydride is mixed with modified polyester at 20-25 DEG C, and tetrabutyl titanate is added, and the mixture is stirred at 150-170 DEG C for 0.5-1 h to obtain modified calcium carbonate.

6. The processing technology of the anti-permeability durable prefabricated assembled concrete counter-cant according to claim 1, characterized in that: The mass ratio of the calcium carbonate-maleic anhydride, the modified polyester and the tetrabutyl titanate is 1:(0.2-0.8):(0.03-0.05).

7. An anti-permeation and durable prefabricated assembled concrete inverted dam prepared by the processing process according to any one of claims 1-6.

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