A gypsum-based sound-insulating and heat-insulating floor slab system and its construction method

Abstract

The present invention relates to a gypsum-based sound insulation and thermal insulation floor slab system and its construction method, belonging to the technical field of building materials. The floor slab system includes a structural layer, a sound insulation and thermal insulation layer composed of a gypsum-based composite material, a leveling layer composed of a moisture-proof and mold-proof gypsum self-leveling mortar, and a floor decoration layer, which are arranged in sequence from bottom to top; the sound insulation and thermal insulation layer and the leveling layer are made of the same gypsum-based material, providing a basis for the firm bonding of the upper and lower layers. On the basis of the same gypsum-based material, the configuration of each component in the gypsum-based composite material in the sound insulation and thermal insulation layer and the configuration of each component in the moisture-proof and mold-proof gypsum self-leveling mortar in the leveling layer make the sound insulation and thermal insulation layer and the leveling layer firmly bonded without displacement. The floor slab system has no shrinkage, does not require reinforcement, and has anti-cracking function. The leveling layer and the sound insulation and thermal insulation layer both adopt a gypsum-based cementitious material with micro-expansion characteristics, and the system has good volume stability, solving the problem of hollowing and cracking of the organic floating floor slab.

Description

Technical Field

[0001] The invention relates to a gypsum-based sound insulation and heat preservation floor system and a construction method thereof, belonging to the technical field of building materials. Background Art

[0002] With the improvement of people's living standards, higher requirements are put forward for the health performance, environmental performance and sound insulation performance of residential residence. Among them, the indoor sound environment is most closely related to people's quality of life. The main factors affecting the indoor sound environment are the floor impact sound and air sound transmission between the upper and lower floors, as well as the air sound transmission of the partition wall on the same floor. Since the attenuation of solid sound propagating in the building structure is very small, the floor impact sound has the greatest impact. Most existing buildings use ordinary concrete floor slabs, which are generally 120mm thick. The impact sound insulation performance is much higher than the 75dB required by the national standard GB50118-2005, which does not meet the requirements of floor impact sound insulation. In addition, the heat transfer coefficient of ordinary concrete floor slabs is almost twice that of the national standard GB55015 and the landmark DBJ51 / 143. The thermal insulation performance is poor and cannot meet the requirements of building energy conservation, which seriously affects the quality of the building and leads to huge social energy consumption.

[0003] At present, in order to solve the problems of sound insulation and heat preservation of floor slabs, the following three measures are usually adopted: laying elastic surface layer, adding sound insulation ceiling and setting organic floating floor slabs. Laying elastic surface layer can effectively reduce the impact sound of floor slabs, but it has little effect on air sound insulation. Adding sound insulation ceiling can improve the sound insulation effect, but the noise excited by the floor surface layer will also be transmitted along the solid of the house through the surrounding walls, and the isolation of impact sound still cannot meet the requirements of general residences. The floating floor slab system with original floor slab + vibration reduction pad + reinforced concrete layer has been widely used in construction projects, especially the organic floating floor slab system, which is composed of floor slab structure layer, sound insulation and vibration reduction layer, leveling floating layer and ground decoration layer from bottom to top.

[0004] However, the important problem faced by the organic floating floor system is that the most widely used sound insulation materials in the sound insulation and vibration reduction layer are organic sound insulation materials such as polyethylene foam sound insulation materials, polyurethane sound insulation, and polyester fiber thermal insulation composite materials. Organic sound insulation materials are chemically unstable and emit toxic and harmful substances during use. They have poor flame retardant properties and are prone to environmental pollution. They have high water vapor permeability coefficients, are easy to decompose, are prone to mildew, and have weak weather resistance. In addition, the leveling floating layer in the organic floating floor system needs to be made of 40mm thick fine stone concrete with steel mesh, and it needs to be moisturized and maintained. The construction period is generally about 7 days. The leveling floating layer has poor adhesion to the connected layers, is easy to delaminate, is flammable, and is prone to hollowing and cracking. After cracking, the layers below will be displaced, so there will be gaps, which will affect the sound absorption and insulation effect. Summary of the invention

[0005] In view of this, in order to solve the problems of poor adhesion, easy occurrence of hollowing and cracking, and long construction period existing in the floor slab system in the prior art, the purpose of the present invention is to provide a gypsum-based sound insulation and thermal insulation floor slab system and its construction method. The upper and lower layers of the floor slab system are firmly bonded without displacement, and have good sound insulation and thermal insulation performance. In the construction method of the floor slab system, after the mortar in the leveling layer is poured, people can step on it to carry out the next process after 4 hours.

[0006] To achieve the purpose of the present invention, the following technical solutions are provided.

[0007] A gypsum-based sound insulation and thermal insulation floor slab system, the floor slab system includes a structural layer, a sound insulation and thermal insulation layer, and a leveling layer arranged in sequence from bottom to top; the floor slab system also includes a floor decoration layer arranged above the leveling layer;

[0008] Among them, the sound insulation and thermal insulation layer is composed of a gypsum-based composite material, and the leveling layer is composed of a moisture-proof and mildew-proof gypsum self-leveling mortar;

[0009] The gypsum-based composite material is composed of the following components in parts by weight: hydrophilic rubber particles with a mesh size of 60 to 100: 15 to 40 parts, phosphogypsum or desulfurized gypsum: 60 to 85 parts, retarding water reducer: 0.26 to 1.12 parts, water: 30 to 50 parts, nano-aerogel: 1 to 5 parts; the impact sound insulation of the sound insulation and thermal insulation layer ≤ 60 dB, the thermal conductivity ≤ 0.13 W / (m·K), and the fire protection grade is A; the thickness of the sound insulation and thermal insulation layer is set according to application requirements, and the maximum does not exceed 50 mm.

[0010] The hydrophilic rubber particles are rubber particles with a sphericity coefficient of 0.80 to 0.85 and a contact angle ≤ 15°.

[0011] The moisture-proof and mildew-proof gypsum self-leveling mortar is composed of the following components in parts by weight: phosphogypsum or desulfurized gypsum: 100 to 120 parts, water: 35 to 50 parts, retarding water reducer: 0.26 to 1.12 parts, waterproof agent: 0.2 to 0.8 parts, mildew-proof agent: 0.1 to 0.5 parts; the moisture-proof and mildew-proof gypsum self-leveling mortar: its 30-minute fluidity loss ≤ 3 mm, water absorption rate ≤ 1%, shrinkage rate ≤ 0.01%, mildew-proof grade is 0, and fire protection grade is A. The thickness of the leveling layer is set according to application requirements, and the maximum does not exceed 15 mm.

[0012] More preferably, the hydrophilic rubber particles are prepared by the following method: rubber particles with a sphericity coefficient of 0.80 to 0.85 are subjected to movement treatment in a plasma atmosphere, the treatment power is 60W to 200W, and the treatment time is 200s to 300s. The rubber particles are treated under specific parameters in a plasma atmosphere, and many voids and microcracks can be generated on the surface of the rubber particles, so that the contact angle of the rubber particles is ≤15°. In this way, it is beneficial for the gypsum paste in the gypsum-based composite material to penetrate into the voids. When the gypsum-based composite material is poured and cured, a good meshing effect will be generated between the hydrophilic rubber and the gypsum, which is beneficial to improving the wrapping property and bonding strength of the gypsum to the hydrophilic rubber particles. Further, by adjusting the plasma power and treatment time, the contact angle is further reduced to ≤10°, the treatment power is 80W to 120W, and the treatment time is 230s to 270s.

[0013] Preferably, the retarding water reducer used in the gypsum-based composite material and the moisture-proof and mildew-proof gypsum self-leveling mortar is the retarding water reducer described in the Chinese patent application document "A Retarding Water Reducer for Phosphorus Building Gypsum and Its Preparation Method" with the patent publication number CN110482901A. This retarding water reducer is composed of the following components in parts by weight: 90 to 100 parts of polycarboxylic acid-based mother liquor or melamine-based mother liquor, 9 to 20 parts of borax, 0.2 to 1.0 part of retarder, 0 to 1.5 parts of cellulose ether, 0.1 to 0.2 part of suspension stabilizer, 0.1 to 1 part of defoamer, and 90 to 100 parts of water.

[0014] Preferably, the waterproof agent used in the moisture-proof and mildew-proof gypsum self-leveling mortar is the waterproof agent described in the Chinese patent application document "A Composite Gypsum Waterproof Agent and Its Application Method" with the patent publication number CN109851275A. This waterproof agent includes the following components in parts by weight: 1.5 to 2.8 parts of alkyl sodium silicate, 2.0 to 3.9 parts of stearic acid, 15.8 to 24.2 parts of alum, 11.2 to 22.4 parts of titanium dioxide, 75.0 to 100.0 parts of cement, 150.0 to 200.0 parts of mineral powder, and 0.5 to 1.0 part of hydroxyl-terminated modified hyperbranched polymer.

[0015] The mildew preventer used in the moisture-proof and mildew-proof gypsum self-leveling mortar is preferably a mildew preventer described in the Chinese patent application document "Preparation and application method of a gypsum composite mildew preventer with waterproof function" with patent publication number CN111847975A, and the mildew preventer includes the following components in parts by weight: 3-8 parts of inorganic antibacterial component, 3-8 parts of chitosan, 3-7 parts of sodium methyl silicate, 4-14 parts of silicone-acrylic emulsion, 0.2-2 parts of pH adjuster, 0.1-1 parts of sodium dodecyl sulfate; the inorganic antibacterial component includes 1-3 parts of nano silver, 1-3 parts of borax, and 1-5 parts of nano titanium dioxide. The mildew preventer is a gypsum composite mildew preventer with waterproof function, which interferes with the inhibition of mold DNA / RNA synthesis technology by destroying and preventing the formation of cell membranes of mildew bacteria in phosphogypsum products, causing the death of bacteria, and achieving the inhibitory and killing effect on mold, yeast and algae.

[0016] Preferably, the nano aerogel is one or more of nano graphene aerogel, nano silica aerogel and flexible aerogel composite material.

[0017] More preferably, the nano aerogel is composed of a nano graphene aerogel and a flexible aerogel composite material. The density of the nano graphene aerogel is 0.015 g / cm 3 , thermal conductivity <0.04W / (m·K), so the graphene aerogel has excellent properties such as low density, high load-bearing ratio, low thermal conductivity, and high specific surface area; the flexible aerogel composite material has the characteristics of low thermal conduction and low thermal radiation, and can achieve excellent passive thermal insulation function.

[0018] The gypsum-based composite material also includes a composite foaming agent, the weight portion of the composite foaming agent is greater than 0 and less than or equal to 2 parts; the composite foaming agent is composed of the following components in weight portions: 0.1 to 0.5 parts of a foam stabilizer, 8 to 10 parts of a physical foaming agent, and 0.1 to 0.3 parts of sodium sulfate; the composite foaming agent composed of a foam stabilizer, a physical foaming agent and sodium sulfate is used in combination with gypsum, so that the collapse loss of the gypsum-based composite material in 1 hour is ≤2mm, and the final setting time is 30 to 50 minutes.

[0019] The floor system also includes a ground decoration layer arranged on the leveling layer; the floor in the ground decoration layer can be determined according to application requirements, such as wooden floor, stone, ceramic floor tile, mosaic tile or composite floor; when stone, ceramic floor tile, mosaic tile is used as the floor, an adhesive layer is laid thereunder; when wooden floor or composite floor is used as the floor, a moisture-proof layer is laid thereunder.

[0020] Preferably, when the floor is a stone floor tile, a ceramic floor tile or a mosaic tile, the bonding layer is selected from polymer cement-based bonding mortar, gypsum bonding mortar or moisture-proof and mildew-proof gypsum bonding mortar, more preferably moisture-proof and mildew-proof gypsum bonding mortar, with a thickness of 4 mm to 6 mm, a mildew-proof grade of 0, a pull-out bonding strength of ≥1.5 MPa, and a fire protection grade of A;

[0021] When the floor is a wooden floor or a composite floor, the moisture-proof layer is selected from pearl cotton (EPE), ethylene-vinyl acetate copolymer (EVA), electron cross-linked polyethylene foam material (IXPE), plasticizer-free polyvinyl chloride (UPVC), aluminum film floor mat or paper floor mat, with a thickness controlled at 1.5 mm to 2.5 mm and a water absorption rate of ≤0.5%.

[0022] A construction method of the gypsum-based sound-insulating and heat-insulating floor slab system of the present invention, the steps of the method are as follows:

[0023] (1) Substrate treatment and marking of the horizontal line: Clean the structural layer in the floor slab system, including sweeping the floating dust and debris on the surface of the structural layer; Use a laser level to mark the horizontal line on the surrounding walls to determine the thickness of each layer;

[0024] (2) Paste vertical sound-insulating sheets: Paste vertical sound-insulating sheets at the corners and door sills, and level the top of the vertical sound-insulating sheets with the bottom of the floor;

[0025] For example: The height of the vertical sound-insulating sheet should be 1.5 mm to 6 mm higher than the leveling layer;

[0026] When pasting vertical sound-insulating sheets at the surrounding corners and door sills, when the floor in the ground decoration layer is a stone floor tile, a ceramic floor tile or a mosaic tile, and the bonding layer is selected from polymer cement-based bonding mortar, gypsum bonding mortar or moisture-proof and mildew-proof gypsum bonding mortar, the vertical sound-insulating sheet should be 4 mm to 6 mm higher than the leveling layer and flush with the top of the bonding layer;

[0027] When the floor in the ground decoration layer is a wooden floor or a composite floor, and the moisture-proof layer is selected from EPE, EVA, IXPE, UPVC, aluminum film floor mat or paper floor mat, the vertical sound-insulating sheet should be 1.5 mm to 2.5 mm higher than the leveling layer and flush with the top of the moisture-proof layer;

[0028] (3) Prepare the sound-insulating and heat-insulating layer:

[0029] Use a forced mixer to stir each component in the gypsum-based composite material to prepare a gypsum-based composite material slurry. The stirring time is 2 min to 3 min, and the stirring is uniform. Control the fluidity of the slurry at 140 mm ± 3 mm, and pour the slurry onto the cleaned structural layer to form a continuous and seamless sound-insulating and heat-insulating layer;

[0030] (4) Prepare a leveling layer on the sound insulation layer:

[0031] 0.5h to 1h after the sound insulation layer is laid, pour moisture-proof and mildew-proof gypsum self-leveling mortar to form a leveling layer;

[0032] (5) The sound insulation layer and the leveling layer are constructed continuously and can be cured naturally. 4 hours after the leveling layer is poured, people can proceed to the next process and lay the floor decoration layer;

[0033] When the ground decoration layer is not included, the construction period until the leveling layer is poured is 4h to 6h.

[0034] Beneficial Effects

[0035] (1) The present invention provides a gypsum-based sound insulation and heat preservation floor system, in which the sound insulation and heat preservation layer and the leveling layer in the floor system are both gypsum-based homogeneous materials, providing a basis for the firm bonding of the upper and lower layers. Based on the gypsum-based homogeneous materials, the present invention configures the components of the gypsum-based composite material in the sound insulation and heat preservation layer, and configures the components of the moisture-proof and mildew-proof gypsum self-leveling mortar in the leveling layer, so that the sound insulation and heat preservation layer and the leveling layer are firmly bonded without displacement. The floor system has no shrinkage, does not require reinforcement, and has anti-cracking function. The leveling layer and the sound insulation and heat preservation layer are both made of gypsum homogeneous cementitious materials with micro-expansion characteristics. The system has good volume stability, which solves the problem of hollowing and cracking of organic floating floors. Since the present invention is a gypsum-based floor system, it is a green, environmentally friendly, pollution-free product with stable chemical properties. It will not emit toxic and harmful substances during use and will not cause environmental pollution. It has a low water vapor permeability coefficient, does not decompose or mildew, and has strong weather resistance; it can withstand a static load of 0.8MPa to 2.2MPa, has excellent flame retardant properties, and has a combustion performance grade of A; its service life is ≥50 years, which can meet the requirement of the same life as the main body of the building.

[0036] The present invention adds hydrophilic rubber particles to the sound insulation layer to enhance the sound insulation and heat preservation function of the floor system. When the same impact sound source acts, the impact sound insulation of the floor system of the present invention can be reduced by about 5%.

[0037] The overall configuration of the floor system of the present invention makes its heat transfer coefficient ≤1.5W / (m 2 ·K), which is 15% higher than the standard, and the heat transfer coefficient is less than 1 / 2 of the traditional floor heat transfer coefficient, meeting the requirements of the "Sichuan Residential Building Energy Saving Design Standard" DB51-5027 for the heat transfer coefficient of household floor slabs ≤ 1.8 [W / (m 2 ·K)], with heat preservation function.

[0038] Although the hydrophilic rubber particles with a fire rating of B are used in the sound insulation and thermal insulation layer of the floor slab system of the present invention, since there are voids on the surface of the hydrophilic rubber particles in the present invention, which is beneficial to the penetration of the gypsum slurry, and gypsum is a fireproof material of Class A. After the rubber particles are wrapped by gypsum, the fire rating of the floor slab system is also Class A.

[0039] The carbon emission of the floor slab system of the present invention is less than 40% of that of the organic material sound insulation floating floor system; the leveling layer of the floor slab system of the present invention is high-strength and durable, and has both moisture-proof and mildew-proof properties, and the mildew-proof grade is 0. The stiffness of the gypsum-based composite material after hardening is better than that of the low-density foamed sound insulation layer, significantly improving the foot feeling comfort.

[0040] The leveling layer in the floor slab system of the present invention is a gypsum-based self-leveling leveling layer, which is high-strength and durable, can be constructed flat in one time without secondary leveling, has both moisture-proof and mildew-proof properties, and the mildew-proof grade is 0. The stiffness of the gypsum composite material after hardening is better than that of the organic sound insulation layer, significantly improving the foot feeling comfort.

[0041] The carbon reduction effect of the present invention is obvious. Compared with the cement-based material floor sound insulation and thermal insulation system, the carbon emission is reduced by 60%, the surface density is reduced by more than 30%, the self-weight load of the floor is reduced, and the safety is improved.

[0042] (2) The present invention provides a gypsum-based sound insulation and thermal insulation floor slab system. The rubber particles are treated under specific parameters in a plasma atmosphere, and many voids and microcracks can be generated on the surface of the rubber particles, so that the contact angle of the rubber particles ≤ 15°. In this way, it is beneficial for the gypsum slurry in the gypsum-based composite material to penetrate into the voids. When the gypsum-based composite material is poured and cured, a good meshing effect will be generated between the hydrophilic rubber and the gypsum, which is beneficial to improving the wrapping property and bonding strength of the gypsum to the hydrophilic rubber particles.

[0043] (3) The present invention provides a gypsum-based sound insulation and thermal insulation floor slab system. A composite foaming agent composed of a foam stabilizer, a physical foaming agent and sodium sulfate is used in combination with gypsum, which can make the slump loss of the gypsum-based composite material ≤ 2 mm in 1 h, and the final setting time is 30 - 50 min.

[0044] (4) The present invention provides a gypsum-based sound insulation and thermal insulation floor slab system. The floor in the floor decoration layer can be determined according to application requirements, such as wooden floor, stone, ceramic floor tile, mosaic or composite floor; when using stone, ceramic floor tile, mosaic as the floor, a bonding layer is laid under it; when using wooden floor, composite floor as the floor, a moisture-proof layer is laid under it.

[0045] (5) The present invention provides a construction method for a gypsum-based sound insulation and thermal insulation floor system. For the floor system containing the sound insulation and thermal insulation layer and the leveling layer described in the present invention, people can walk on it 4 hours after the construction of the leveling layer, and it is cured naturally. The construction period is less than 1 / 10 of that of the organic material sound insulation floating floor. The leveling layer and the sound insulation and thermal insulation layer of the floor system described in the present invention both adopt gypsum-based cementitious materials with micro-expansion characteristics, and the system has good volume stability. At the same time, the continuous construction method of the present invention is adopted to better solve the problems of hollowing and cracking of the organic floating floor. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is the mold-proof test result of the floor system described in Comparative Example 2.

[0047] Figure 2 It is the mold-proof test result of the floor system described in Example 1.

[0048] Figure 3 It is the mold-proof test result of the floor system described in Example 2.

[0049] Figure 4 It is the mold-proof test result of the floor system described in Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0050] The present invention will be further described below in conjunction with the specific embodiments. Among them, the methods are all conventional methods unless otherwise specified, and the raw materials can all be obtained from public commercial channels or prepared according to the literature unless otherwise specified.

[0051] Comparative Example 1

[0052] In this comparative example, C30 concrete with a thickness of 120 mm is used as the floor structural layer.

[0053] Comparative Example 2

[0054] This comparative example provides a floor system, which from bottom to top is successively a C30 concrete with a thickness of 120 mm as the floor structural layer, a polyurethane material with a thickness of 2 mm as the sound insulation and vibration damping layer, a leveling floating layer composed of C25 fine aggregate with a steel mesh with a thickness of 50 mm, an EPE with a thickness of 1.5 mm as the moisture-proof layer, the water absorption rate of EPE ≤ 0.5%, and a wooden floor with a thickness of 12 mm.

[0055] Example 1

[0056] A gypsum-based sound insulation and thermal insulation floor system, the floor system from bottom to top is successively a structural layer, a sound insulation and thermal insulation layer, a leveling layer and a floor decoration layer.

[0057] The structural layer is composed of C30 concrete with a thickness of 120 mm; the sound insulation and thermal insulation layer is composed of a gypsum-based composite material with a thickness of 30 mm; the leveling layer is composed of a moisture-proof and mildew-proof gypsum self-leveling mortar with a thickness of 10 mm; the floor decoration layer, from the leveling layer upwards, is a 1.5-mm-thick EVA moisture-proof layer with a water absorption rate of EVA ≤ 0.5%, and a 12-mm-thick wooden floor.

[0058] The raw materials of the gypsum-based composite material are composed of the following components in parts by weight: 60-mesh hydrophilic rubber particles: 25 parts, desulfurized gypsum: 75 parts, retarder-type water reducer: 0.57 part, water: 38 parts, nano-graphene aerogel: 2 parts, composite foaming agent: 0.5 part.

[0059] The hydrophilic rubber is prepared by the following method: Rubber particles with a sphericity coefficient of 0.8 and a particle size of 60 mesh are processed in a plasma atmosphere with a processing power of 100 W and a processing time of 250 s to obtain rubber particles with a contact angle of ≤ 10°.

[0060] The raw materials of the composite foaming agent are composed of the following components in parts by weight: foam stabilizer: 0.2 part, physical foaming agent: 8 parts, sodium sulfate: 0.12 part.

[0061] The raw materials of the moisture-proof and mildew-proof gypsum self-leveling mortar are composed of the following components in parts by weight: desulfurized gypsum: 100 parts, water: 35 parts, retarder-type water reducer: 0.26 part, waterproof agent: 0.2 part, mildew-proof agent: 0.2 part.

[0062] The retarder-type water reducer used in the gypsum-based composite material and the moisture-proof and mildew-proof gypsum self-leveling mortar is the retarder-type water reducer described in the Chinese patent application document "A Retarder-Type Water Reducer for Phosphorus Building Gypsum and Its Preparation Method" with the patent publication number CN110482901A. This retarder-type water reducer is composed of the following components in parts by weight: 92 parts of polycarboxylic acid-based mother liquor, 10 parts of borax, 0.5 part of protein-based retarder, 0.7 part of hydroxypropyl methyl cellulose ether, 0.15 part of cellulose nanospheres, 0.8 part of polysiloxane, and 97 parts of water.

[0063] The waterproof agent used in the moisture-proof and mildew-proof gypsum self-leveling mortar is the waterproof agent described in the Chinese patent application document "A Composite Gypsum Waterproof Agent and Its Application Method" with the patent publication number CN109851275A. This waterproof agent includes the following components in parts by weight: 2 parts of alkyl sodium silicate, 2.8 parts of stearic acid, 20 parts of alum, 18 parts of titanium dioxide, 90 parts of Portland cement, 180 parts of S95 slag powder, and 0.8 part of end-hydroxyl modified hyperbranched polymer; the end-hydroxyl modified hyperbranched polymer is a hyperbranched polymer modified with myristoyl chloride.

[0064] The mildew-proof agent used in the moisture-proof and mildew-proof gypsum self-leveling mortar is the mildew-proof agent described in the Chinese patent application document "Preparation and Application Method of a Gypsum Composite Mildew-proof Agent with Waterproof Function" with the patent publication number CN111847975A. This mildew-proof agent is composed of the following components in parts by weight: 6 parts of inorganic antibacterial component, 6 parts of chitosan, 6 parts of sodium methyl silicate, 10 parts of silicone-acrylic emulsion, 1.5 parts of sodium bicarbonate, and 0.7 part of sodium dodecyl sulfate; each part of the inorganic antibacterial component is composed of 2 parts of nano silver, 2 parts of borax, 3 parts of nano titanium dioxide, and 12 parts of montmorillonite.

[0065] The construction method of the gypsum-based sound insulation and heat insulation floor system described in this embodiment is as follows:

[0066] (1) Substrate treatment and marking of the horizontal line: Clean the structural layer in the floor system, including sweeping the floating dust and debris on the surface of the structural layer; use a laser level to mark the horizontal line on the surrounding walls to determine the thickness of each layer.

[0067] (2) Paste vertical sound insulation sheets: Paste vertical sound insulation sheets at the corners and door thresholds. In this embodiment, the floor uses wooden floors, and the vertical sound insulation sheets are 1.5 mm higher than the leveling layer and flush with the top of the moisture-proof layer, that is, the top of the vertical sound insulation sheets is level with the bottom of the floor.

[0068] (3) Prepare the sound insulation and heat insulation layer:

[0069] Use a forced mixer to stir each component in the raw materials of the gypsum-based composite material to prepare a gypsum-based composite material slurry. The stirring time is 2 min to 3 min, and stir evenly. Control the fluidity of the slurry at 140 ± 3 mm, and pour the slurry on the cleaned structural layer to form a continuous and seamless sound insulation and heat insulation layer.

[0070] (4) Prepare the leveling layer on the sound insulation and heat insulation layer:

[0071] After the sound insulation and heat insulation layer is laid for 1 h, pour the moisture-proof and mildew-proof gypsum self-leveling mortar to prepare the leveling layer.

[0072] (5) The sound insulation and heat insulation layer and the leveling layer are constructed continuously and cured naturally. After the leveling layer is poured for 4 h, people can walk on it to carry out the next process, that is, lay the floor decoration layer.

[0073] When the floor decoration layer is not included, the construction period from pouring the leveling layer to the end is 4 h to 6 h.

[0074] Example 2

[0075] A gypsum-based sound insulation and heat insulation floor system provided in this embodiment, different from Example 1, the sound insulation and heat insulation layer is composed of a gypsum-based composite material with a thickness of 40 mm.

[0076] The gypsum-based composite material is composed of the following components in parts by weight: hydrophilic rubber particles of 80 mesh: 35 parts, phosphogypsum: 65 parts, retarder-type water reducer: 0.57 part, water: 34 parts, nano-graphene aerogel: 3 parts;

[0077] The waterproofing agent in the moisture-proof and mildew-proof gypsum self-leveling mortar: 0.25 part, mildew-proof agent: 0.3 part.

[0078] The rest are the same as in Example 1.

[0079] Example 3

[0080] A gypsum-based sound-insulating and heat-insulating floor slab system provided in this example, different from Example 1, the sound-insulating and heat-insulating layer is composed of a gypsum-based composite material with a thickness of 40 mm;

[0081] The gypsum-based composite material is composed of the following components in parts by weight: hydrophilic rubber particles of 100 mesh: 45 parts, desulfurized gypsum: 60 parts, retarder-type water reducer 0.79 part, water: 38 parts, nano-graphene aerogel: 4.5 parts;

[0082] The hydrophilic rubber is prepared by the following method: rubber particles with a sphericity coefficient of 0.8 and a particle size of 100 mesh are subjected to movement treatment in a plasma atmosphere, the treatment power is 120 W, and the treatment time is 240 s to obtain rubber particles with a contact angle ≤ 10°.

[0083] The waterproofing agent in the moisture-proof and mildew-proof gypsum self-leveling mortar: 0.35 part, mildew-proof agent: 0.4 part.

[0084] The rest are the same as in Example 1.

[0085] Test Example

[0086] The floor slab systems provided in Comparative Examples 1-2 and Examples 1-3 are subjected to acoustic performance tests, and the weighted standardized impact sound pressure level and the improvement amount of the impact sound pressure level of each floor slab system are tested through a source impact pilot simulation test; the heat transfer coefficient and carbon emission of each floor slab system are calculated through the following formulas respectively; the data of the weighted standardized impact sound pressure level, the improvement amount of the impact sound pressure level, the heat transfer coefficient and the carbon emission are shown in Table 1.

[0087] The heat transfer coefficient (K) is calculated by the following formula:

[0088] K = 1 / R, where R is the total thermal resistance of the sound-insulating and heat-insulating floor slab.

[0089] Carbon emission (C JZ ) is calculated according to the carbon emission calculation formula in GB / T51366-2019 "Standard for Calculating Building Carbon Emissions".

[0090] The mechanical properties and moisture and mildew proof properties of the leveling courses of Comparative Example 2 and Examples 1 to 3 are shown in Table 2. Among them, the anti-mildew test is based on the standard "Determination of Resistance of Synthetic Polymers to Fungi" ASTM G21, and the anti-mildew grade is judged by visually observing the fungal growth area (Grade 0: no mold growth, the material has extremely strong mildew resistance; Grade 1: there are traces of mold growth and spore production, area < 10%, the material has strong mildew resistance; Grade 2: there is a small amount of mold growth and spore production, 10% < area < 30%, the material has no mildew resistance; Grade 3: there is a small amount of mold growth and spore production, 30% < area < 60%, the material has no mildew resistance; Grade 4: there is a small amount of mold growth and spore production, 60% < area < 100%, the material has no mildew resistance. The test selected strains: Aspergillus niger - ATCC 16404; Penicillium pinophilum - ATCC 11797; Chaetomium globosum - ATCC 6205; Scopulariopsis brevicaulis - ATCC 9645; Aureobasidium pullulans - ATCC 15233).

[0091] Table 1 Weighted standardized impact sound pressure levels, impact sound pressure level improvement amounts, heat transfer coefficients and carbon emissions of Comparative Examples 1 to 2 and Examples 1 to 3

[0092]

[0093]

[0094] Remark: The comparison of the three indicators of carbon emission calculation, fire protection grade and surface density does not include the structural layer.

[0095] As can be seen from Table 1, the weighted standardized impact sound pressure levels of Examples 1 - 3 are all less than those of Comparative Examples 1 - 2, and the impact sound pressure level improvement amounts are all greater than those of Comparative Examples 1 - 2. This shows that when using gypsum-based composites as the sound insulation and thermal insulation layer and polyurethane as the floating floor sound insulation and thermal insulation layer in Examples 1 to 3, under the action of the same impact sound source, the sound insulation effect of the gypsum-based composite material is more excellent. By comparing the weighted standardized impact sound pressure levels and impact sound pressure level improvement amounts of Examples 1 - 3, it can be seen that Example 3 has the best impact sound insulation effect.

[0096] Through the calculation of the heat transfer coefficient, it can be known that the heat transfer coefficient of the floor without sound insulation and thermal insulation treatment is 3.47 W / (m 2 ·K). Comparing Examples 1 - 3 with Comparative Example 2 shows that the thermal performance of the gypsum-based sound insulation and thermal insulation floor system in Examples 1 - 3 has been improved to a certain extent compared with the floor system using polyurethane material as the sound insulation and vibration damping layer in Comparative Example 2. From the carbon emission calculation results, it can be seen that the carbon emissions of the gypsum-based sound insulation and thermal insulation floor system in Examples 1 - 3 are smaller than those of the floor system using polyurethane material as the sound insulation and vibration damping layer in Comparative Example 2, and are less than 40% of the organic material sound insulation floating floor system, which is more environmentally friendly.

[0097] As can be seen from the fire protection grade in Table 1, the gypsum-based composite floor slab systems of Examples 1-3 and the floor slab system with polyurethane material of Comparative Example 2 as the sound insulation and vibration damping layer are both Class A. The surface density of the floor slab systems of Examples 1-3 is significantly less than that of Comparative Example 2, indicating that it is about 50% lighter than the surface density of the market polyurethane material thermal insulation and sound insulation system. This shows that the floor slab systems prepared in Examples 1-3 are lighter in mass, so the load on the building is smaller and the building is safer; due to the light mass, the thermal insulation effect of this floor slab system is better.

[0098] Table 2 Mechanical properties and moisture and mold prevention properties of the leveling layers of Comparative Example 2 and Examples 1-3

[0099]

[0100]

[0101] As can be seen from Table 2, the compressive strength and flexural strength of the floor slab systems prepared in Examples 1-3 are better than those of Comparative Example 2, indicating that the stiffness of the floor slab systems prepared in Examples 1-3 is high. Among them, the stiffness of the leveling layer contributes the most to the stiffness of the floor slab system, which means that the stiffness of the leveling layer in Examples 1-3 is better than that of Comparative Example 2; since there is a floor decoration layer above the leveling layer, the leveling layer needs to bear the load, and the higher the compressive and flexural strength of the leveling layer, the better, so it can also effectively avoid hollowing and cracking. The shrinkage rate of the floor slab systems prepared in Examples 1-3 is significantly lower than that of Comparative Example 2, indicating that it is not easy to crack; the floor slab systems prepared in Examples 1-3 have good mold prevention properties and low water absorption.

[0102] As Figure 1 can be seen, there are signs of mold growth around the petri dishes of the specimens in Comparative Example 2, and the mold growth area on the surface of the specimens has exceeded 60%, reaching the worst mold prevention grade of 4, without mold prevention ability; in contrast Figures 2 - 4 can be seen, there are signs of mold growth around the petri dishes of the specimens in Examples 1-3. There are colonies of varying degrees on the surfaces of the specimens in Examples 1-2, and there is no mold on the surface of the specimen in Example 3, indicating that Examples 1-3 all have a certain mold prevention effect, and the mold prevention effect of Example 3 is the best.

[0103] The present invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement carried out under the principle of the spirit of the present invention will be regarded as within the protection scope of the present invention.

Claims

1. A gypsum-based sound insulation and thermal insulation floor slab system, Characterized in that: The floor slab system includes a structural layer, a sound insulation and thermal insulation layer, and a leveling layer arranged in sequence from bottom to top; the sound insulation and thermal insulation layer is composed of a gypsum-based composite material, and the leveling layer is composed of a moisture-proof and mildew-proof gypsum self-leveling mortar; The gypsum-based composite material is composed of the following components in parts by weight: hydrophilic rubber particles with a mesh size of 60 to 100: 15 to 40 parts, phosphogypsum or desulfurized gypsum: 60 to 85 parts, retarding water reducer: 0.26 to 1.12 parts, water: 30 to 50 parts, nano-aerogel: 1 to 5 parts; The hydrophilic rubber particles are rubber particles with a sphericity coefficient of 0.80 to 0.85 and a contact angle ≤ 15°; The moisture-proof and mildew-proof gypsum self-leveling mortar is composed of the following components in parts by weight: phosphogypsum or desulfurized gypsum: 100 to 120 parts, water: 35 to 50 parts, retarding water reducer: 0.26 to 1.12 parts, waterproofing agent: 0.2 to 0.8 parts, mildew-proofing agent: 0.1 to 0.5 parts.

2. A gypsum-based sound insulation and thermal insulation floor slab system according to claim 1, Characterized in that: The hydrophilic rubber particles are prepared by the following method: Rubber particles with a sphericity coefficient of 0.80 to 0.85 are subjected to movement treatment in a plasma atmosphere, the treatment power is 60W to 200W, and the treatment time is 200s to 300s.

3. A gypsum-based sound insulation and thermal insulation floor slab system according to claim 2, Characterized in that: Under the conditions of a treatment power of 80W to 120W and a treatment time of 230s to 270s, hydrophilic rubber particles with a contact angle ≤ 10° are obtained.

4. A gypsum-based sound insulation and thermal insulation floor slab system according to any one of claims 1 to 3, Characterized in that: The retarding water reducer is composed of the following components in parts by weight ratio: 90 to 100 parts of polycarboxylate-based mother liquor or melamine-based mother liquor, 9 to 20 parts of borax, 0.2 to 1.0 part of retarder, 0 to 1.5 parts of cellulose ether, 0.1 to 0.2 part of suspension stabilizer, 0.1 to 1 part of defoaming agent, and 90 to 100 parts of water; The waterproofing agent includes the following components in parts by weight: 1.5 to 2.8 parts of alkyl sodium silicate, 2.0 to 3.9 parts of stearic acid, 15.8 to 24.2 parts of alum, 11.2 to 22.4 parts of titanium dioxide, 75.0 to 100.0 parts of cement, 150.0 to 200.0 parts of mineral powder, 0.5 to 1.0 part of end-hydroxyl modified hyperbranched polymer; The mildew-proofing agent includes the following components in parts by weight: 3 to 8 parts of inorganic antibacterial component, 3 to 8 parts of chitosan, 3 to 7 parts of methyl sodium silicate, 4 to 14 parts of silicone-acrylic emulsion, 0.2 to 2 parts of pH regulator, 0.1 to 1 part of sodium dodecyl sulfate; the inorganic antibacterial component includes 1 to 3 parts of nano-silver, 1 to 3 parts of borax, 1 to 5 parts of nano-titanium dioxide.

5. A gypsum-based sound insulation and thermal insulation floor slab system according to any one of claims 1 to 3, Characterized in that: The nano-aerogel described above is one or more of nano-graphene aerogel, nano-silica aerogel and flexible aerogel composite material.

6. A gypsum-based sound insulation and thermal insulation floor system according to claim 4, characterized in that: the nano-aerogel described above is composed of nano-graphene aerogel and flexible aerogel composite material.

7. A gypsum-based sound insulation and thermal insulation floor system according to any one of claims 1 to 3, characterized in that: the gypsum-based composite material further includes a composite foaming agent, and the weight parts of the composite foaming agent are greater than 0 and less than or equal to 2 parts; the composite foaming agent is composed of the following components in weight parts: 0.1 part to 0.5 part of foam stabilizer, 8 parts to 10 parts of physical foaming agent, and 0.1 part to 0.3 part of sodium sulfate.

8. A gypsum-based sound insulation and thermal insulation floor system according to any one of claims 1 to 3, characterized in that: the floor system further includes a floor decoration layer arranged above the leveling layer; the floor in the floor decoration layer is a wooden floor, stone, ceramic floor tile, mosaic or composite floor; when the floor is a stone floor tile, ceramic floor tile or mosaic, a bonding layer is laid under the floor, and the bonding layer is selected from polymer cement-based bonding mortar, gypsum bonding mortar or moisture-proof and mildew-proof gypsum bonding mortar; when the floor is a wooden floor or composite floor, a moisture-proof layer is laid under the floor, and the moisture-proof layer is selected from EPE, ethylene-vinyl acetate copolymer, electron cross-linked polyethylene foam material, plasticizer-free polyvinyl chloride, aluminum film floor mat or paper floor mat, with a thickness of 1.5 mm to 2.5 mm and a water absorption rate ≤ 0.5%.

9. A gypsum-based sound insulation and thermal insulation floor system according to claim 8, characterized in that: the bonding layer is moisture-proof and mildew-proof gypsum bonding mortar, with a thickness of 4 mm to 6 mm, a mildew-proof grade of 0, a pull-out bonding strength ≥ 1.5 MPa, and a fire protection grade of A.

10. A construction method of a gypsum-based sound insulation and thermal insulation floor system according to any one of claims 1 to 9, characterized in that: the steps of the method are as follows: (1) Clean the structural layer and determine the thickness of each layer; (2) Stick vertical sound insulation sheets at the corners and door sills, and level the top of the vertical sound insulation sheets with the bottom of the floor; (3) Stir the components in the gypsum-based composite material evenly to obtain a gypsum-based composite material slurry, with the fluidity of the slurry being 140 mm ± 3 mm, and pour the slurry onto the structural layer to form a continuous and seamless sound insulation and thermal insulation layer; (4) After the sound insulation and thermal insulation layer is laid for 0.5 h to 1 h, pour moisture-proof and mildew-proof gypsum self-leveling mortar to form a leveling layer; (5) The sound insulation and thermal insulation layer and the leveling layer are constructed continuously and cured naturally. After the leveling layer is poured and formed and stabilized, the floor decoration layer is laid.

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