Waterproof and moistureproof polymer raised floor base material and preparation method thereof

Abstract

The invention belongs to the technical field of floor base materials, and particularly relates to a waterproof and moisture-proof polymer raised floor base material and a preparation method thereof. The waterproof and moisture-proof macromolecular raised floor base material comprises the following components in parts by mass: a magnesium oxysulfate base material: 40-60 parts of magnesium oxide, 20-30 parts of magnesium sulfate, 5-10 parts of alkali-resistant glass fabric, 3-8 parts of plant fiber and 2-6 parts of perlite; a polymer modified material: 1-3 parts of modified polypropylene fiber, 2-4 parts of polyvinyl alcohol, 3-5 parts of modified epoxy resin and 1-2 parts of polyurethane; 10-15 parts of an inorganic polymer rock solidification liquid, and 0.5-1.5 parts of a functional additive. The waterproof and moisture-proof polymer raised floor base material prepared by the invention has excellent waterproof and anti-aging effects.

Description

Technical Field

[0001] The invention belongs to the technical field of floor substrates, and in particular relates to a waterproof and moisture-proof polymer elevated floor substrate and a preparation method thereof. Background Art

[0002] Traditional raised floor panels are typically constructed from steel, plastic, or calcium sulfate. While each has its advantages, they lack significant advantages in terms of waterproofing, moisture resistance, fire resistance, and environmental friendliness. For example, steel substrates are susceptible to corrosion from moisture, plastic substrates have a low fire rating, and calcium sulfate substrates easily deform in humid environments and exhibit poor water resistance. Furthermore, while unmodified magnesium oxysulfide boards offer lightweight and fire resistance, they suffer from low strength, poor dimensional stability, and insufficient water resistance, making them difficult to meet the demands of long-term use in high-humidity environments.

[0003] Existing technologies typically require complex processes or the addition of multiple chemical additives to enhance the performance of magnesium oxysulfate boards. However, these methods can introduce environmental risks and increase production costs. Furthermore, traditional raised flooring substrates require additional surface materials such as carpet and tiles after installation, which is a cumbersome and costly process. Therefore, a new raised flooring substrate with excellent waterproofing and moisture resistance, high mechanical strength, environmental friendliness, and ease of installation is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a waterproof and moisture-proof polymer elevated floor substrate and a preparation method thereof.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: A waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 40-60 parts of magnesium oxide, 20-30 parts of magnesium sulfate, 5-10 parts of alkali-resistant glass fiber cloth, 3-8 parts of plant fiber, and 2-6 parts of perlite; Polymer modified materials: 1-3 parts of modified polypropylene fiber, 2-4 parts of polyvinyl alcohol, 3-5 parts of modified epoxy resin, and 1-2 parts of polyurethane; 10-15 parts of inorganic polymer gel liquid, 0.5-1.5 parts of functional additives.

[0006] The functional additives include 0.3-0.8 parts of an anti-aging agent and 0.2-0.7 parts of an ultraviolet absorber.

[0007] The high wear-resistant finishing layer is selected from marble, tile, wood or carpet patterns, and the finishing layer is bonded to the substrate by hot pressing or adhesive.

[0008] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0009] The preparation method of modified polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 200-260℃ to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret (aperture 0.1-0.5 mm) into nascent fibers, which are then solidified by air cooling. (4) Immerse the polypropylene fiber in an ethanol solution of perfluorooctyltriethoxysilane at a concentration of 1-5% at room temperature for 10-30 minutes, then remove and dry at 80-120°C; (5) Stretching and shaping: The fiber is stretched by multi-stage hot rollers (stretching ratio 3-10 times) to improve orientation and crystallinity; (6) Winding and collecting: The stretched fiber is wound into a tube to obtain modified polypropylene fiber.

[0010] The concentration of the ethanol solution of perfluorooctyltriethoxysilane is 1-5 wt %.

[0011] The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin (E-51): 100 parts, fluorine-containing curing agent (perfluoroalkylamine): 30-40 parts, fluorosilane coupling agent (such as 1H,1H,2H,2H-perfluorooctyltriethoxysilane): 5-10 parts, nano-silica: 3-5 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution (concentration 5 wt%) for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin to 60°C, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring for 10 minutes, and vacuum degas.

[0012] (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

[0013] The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

[0014] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add modified polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0015] The pressure of the pulse pressing process in step (4) is 10-15 MPa, the temperature is 50-70°C, and the curing time is 24-48 hours.

[0016] Compared with the prior art, the advantages and beneficial effects of the present invention are: 1. This invention forms a low-surface-energy hydrophobic layer on the surface of polypropylene fibers, significantly reducing the fiber's affinity for water and minimizing moisture adsorption. The modified fibers are evenly distributed within the magnesium oxysulfide matrix, filling the matrix's pores and reducing channels for moisture migration. Pre-wetting with polyvinyl alcohol (PVA) enhances the bond between the fibers and the magnesium oxysulfide matrix, reducing the potential for moisture penetration at the interface.

[0017] 2. The modified epoxy resin introduces fluorinated groups, lowering its surface energy and creating a "lotus effect" that repels liquid water. After the liquid epoxy resin is blended and cured with the magnesium oxysulfide slurry, a three-dimensional cross-linked structure forms, blocking the path for water migration.

[0018] 3. The fiber-reinforced base material resists cracking, while the resin protective layer inhibits external moisture intrusion. The combination significantly extends the material's service life in humid environments. Modified polypropylene fiber, through hydrophobic treatment, closed-cell structure, and interface optimization, physically blocks moisture penetration. Modified epoxy resin, through chemical structure design, nanofiller incorporation, and interface protection, enhances water resistance at both chemical and structural levels. These two synergistically form a multi-layered protection mechanism, significantly enhancing the waterproof and moisture-resistant performance of the raised floor base material, making it suitable for high-humidity, demanding environments. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 50 parts of magnesium oxide, 25 parts of magnesium sulfate, 8 parts of alkali-resistant glass fiber cloth, 5 parts of plant fiber, and 4 parts of perlite; Polymer modified materials: 2 parts of modified polypropylene fiber, 3 parts of polyvinyl alcohol, 4 parts of modified epoxy resin, and 1.5 parts of polyurethane; 12 parts of inorganic polymer gel fluid and 1 part of functional additive.

[0021] The functional additives include 0.5 parts of an anti-aging agent and 0.4 parts of an ultraviolet absorber.

[0022] The high wear-resistant finishing layer is a wood grain finishing layer, and the finishing layer is combined with the base material by hot pressing or adhesive.

[0023] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0024] The preparation method of modified polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 240°C to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret (aperture 0.2 mm) into nascent fibers, which are then solidified by air cooling. (4) Immerse the polypropylene fiber in an ethanol solution of perfluorooctyltriethoxysilane at a concentration of 3% at room temperature for 20 minutes, then take it out and dry it at 90°C; (5) Stretching and shaping: The fiber is stretched by multi-stage hot rollers (stretching ratio 6 times) to improve orientation and crystallinity; (6) Winding and collecting: The stretched fiber is wound into a tube to obtain modified polypropylene fiber.

[0025] The concentration of the ethanol solution of perfluorooctyltriethoxysilane is 2 wt %.

[0026] The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin (E-51): 100 parts, fluorine-containing curing agent (perfluoroalkylamine): 35 parts, fluorosilane coupling agent (1H,1H,2H,2H-perfluorooctyltriethoxysilane): 7 parts, nano-silica: 4 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution (concentration 5 wt%) for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin to 60°C, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring for 10 minutes, and vacuum degas.

[0027] (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

[0028] The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

[0029] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add modified polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0030] The pulse pressing process in step (4) has a pressure of 12 MPa, a temperature of 60° C., and a curing time of 30 hours.

[0031] Comparative Example 1 The difference between this comparative example and Example 1 is that the modified polypropylene fiber is not modified.

[0032] A waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 50 parts of magnesium oxide, 25 parts of magnesium sulfate, 8 parts of alkali-resistant glass fiber cloth, 5 parts of plant fiber, and 4 parts of perlite; Polymer modified materials: 2 parts of polypropylene fiber, 3 parts of polyvinyl alcohol, 4 parts of modified epoxy resin, and 1.5 parts of polyurethane; 12 parts of inorganic polymer gel fluid and 1 part of functional additive.

[0033] The functional additives include 0.5 parts of an anti-aging agent and 0.4 parts of an ultraviolet absorber.

[0034] The high wear-resistant finishing layer is a wood grain finishing layer, and the finishing layer is combined with the base material by hot pressing or adhesive.

[0035] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0036] The preparation method of polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 240°C to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret (aperture 0.2 mm) into nascent fibers, which are then solidified by air cooling. (4) Stretching and shaping: The fiber is stretched by multi-stage hot rollers (stretching ratio 6 times) to improve orientation and crystallinity; (5) Winding and collecting: The stretched fiber is wound into a tube to obtain polypropylene fiber.

[0037] The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin (E-51): 100 parts, fluorine-containing curing agent (perfluoroalkylamine): 35 parts, fluorosilane coupling agent (1H,1H,2H,2H-perfluorooctyltriethoxysilane): 7 parts, nano-silica: 4 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution (concentration 5 wt%) for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin to 60°C, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring for 10 minutes, and vacuum degas.

[0038] (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

[0039] The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

[0040] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0041] The pulse pressing process in step (4) has a pressure of 12 MPa, a temperature of 60° C., and a curing time of 30 hours.

[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that the modified epoxy resin is not modified.

[0043] A waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 50 parts of magnesium oxide, 25 parts of magnesium sulfate, 8 parts of alkali-resistant glass fiber cloth, 5 parts of plant fiber, and 4 parts of perlite; Polymer modified materials: 2 parts of modified polypropylene fiber, 3 parts of polyvinyl alcohol, 4 parts of epoxy resin, and 1.5 parts of polyurethane; 12 parts of inorganic polymer gel fluid and 1 part of functional additive.

[0044] The functional additives include 0.5 parts of an anti-aging agent and 0.4 parts of an ultraviolet absorber.

[0045] The high wear-resistant finishing layer is a wood grain finishing layer, and the finishing layer is combined with the base material by hot pressing or adhesive.

[0046] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0047] The preparation method of modified polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 240°C to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret (aperture 0.2 mm) into nascent fibers, which are then solidified by air cooling. (4) Immerse the polypropylene fiber in an ethanol solution of perfluorooctyltriethoxysilane at a concentration of 3% at room temperature for 20 minutes, then take it out and dry it at 90°C; (5) Stretching and shaping: The fiber is stretched by multi-stage hot rollers (stretching ratio 6 times) to improve orientation and crystallinity; (6) Winding and collecting: The stretched fiber is wound into a tube to obtain modified polypropylene fiber.

[0048] The concentration of the ethanol solution of perfluorooctyltriethoxysilane is 2 wt %.

[0049] The epoxy resin is bisphenol A epoxy resin (E-51).

[0050] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add modified polypropylene fiber, polyvinyl alcohol, epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0051] The pulse pressing process in step (4) has a pressure of 12 MPa, a temperature of 60° C., and a curing time of 30 hours.

[0052] Comparative Example 3 The difference between this comparative example and Example 1 is that the added amounts of modified polypropylene fiber and modified epoxy resin are different.

[0053] A waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 50 parts of magnesium oxide, 25 parts of magnesium sulfate, 8 parts of alkali-resistant glass fiber cloth, 5 parts of plant fiber, and 4 parts of perlite; Polymer modified materials: 5 parts of modified polypropylene fiber, 3 parts of polyvinyl alcohol, 1 part of modified epoxy resin, and 1.5 parts of polyurethane; 12 parts of inorganic polymer gel fluid and 1 part of functional additive.

[0054] The functional additives include 0.5 parts of an anti-aging agent and 0.4 parts of an ultraviolet absorber.

[0055] The high wear-resistant finishing layer is a wood grain finishing layer, and the finishing layer is combined with the base material by hot pressing or adhesive.

[0056] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0057] The preparation method of modified polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 240°C to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret (aperture 0.2 mm) into nascent fibers, which are then solidified by air cooling. (4) Immerse the polypropylene fiber in an ethanol solution of perfluorooctyltriethoxysilane at a concentration of 3% at room temperature for 20 minutes, then take it out and dry it at 90°C; (5) Stretching and shaping: The fiber is stretched by multi-stage hot rollers (stretching ratio 6 times) to improve orientation and crystallinity; (6) Winding and collecting: The stretched fiber is wound into a tube to obtain modified polypropylene fiber.

[0058] The concentration of the ethanol solution of perfluorooctyltriethoxysilane is 2 wt %.

[0059] The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin (E-51): 100 parts, fluorine-containing curing agent (perfluoroalkylamine): 35 parts, fluorosilane coupling agent (1H,1H,2H,2H-perfluorooctyltriethoxysilane): 7 parts, nano-silica: 4 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution (concentration 5 wt%) for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin to 60°C, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring for 10 minutes, and vacuum degas.

[0060] (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

[0061] The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

[0062] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add modified polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0063] The pulse pressing process in step (4) has a pressure of 12 MPa, a temperature of 60° C., and a curing time of 30 hours.

[0064] Comparative Example 4 The difference between this comparative example and Example 1 is that the modified polypropylene fiber is replaced by commercially available polypropylene fiber.

[0065] A waterproof and moisture-proof polymer elevated floor substrate, comprising the following components in parts by weight: Magnesium oxysulfate base material: 50 parts of magnesium oxide, 25 parts of magnesium sulfate, 8 parts of alkali-resistant glass fiber cloth, 5 parts of plant fiber, and 4 parts of perlite; Polymer modified materials: 2 parts of polypropylene fiber, 3 parts of polyvinyl alcohol, 4 parts of modified epoxy resin, and 1.5 parts of polyurethane; 12 parts of inorganic polymer gel fluid and 1 part of functional additive.

[0066] The functional additives include 0.5 parts of an anti-aging agent and 0.4 parts of an ultraviolet absorber.

[0067] The high wear-resistant finishing layer is a wood grain finishing layer, and the finishing layer is combined with the base material by hot pressing or adhesive.

[0068] The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

[0069] The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin (E-51): 100 parts, fluorine-containing curing agent (perfluoroalkylamine): 35 parts, fluorosilane coupling agent (1H,1H,2H,2H-perfluorooctyltriethoxysilane): 7 parts, nano-silica: 4 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution (concentration 5 wt%) for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin to 60°C, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring for 10 minutes, and vacuum degas.

[0070] (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

[0071] The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

[0072] The method for preparing the waterproof and moisture-proof polymer elevated floor substrate comprises the following steps: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

[0073] The pulse pressing process in step (4) has a pressure of 12 MPa, a temperature of 60° C., and a curing time of 30 hours.

[0074] Performance Testing 1. Refer to ASTM D570 (Standard Test Method for Water Absorption of Plastics): Prepare a substrate sample (50 mm × 50 mm × 5 mm) and dry it to constant weight (105°C, 24 hours). Soak the sample in deionized water at 23 ± 2°C for 24 hours. Remove the sample, blot dry with filter paper, and immediately weigh it. Determine the moisture absorption rate.

[0075] 2. Wet heat aging test to determine the strength retention rate.

[0076] Test standard: Refer to GB / T 2423.3 "Steady-state damp heat test" Test conditions: 85°C / 85%RH for 500 hours.

[0077] Table 1 Performance test results

[0078] It can be seen from Table 1 that the substrate of the present invention has good waterproof effect and excellent resistance to moisture and heat aging.

[0079] In comparative example 1, the modified polypropylene fiber is not modified, and the waterproof effect and the resistance to moist heat aging are reduced, which shows that the modified polypropylene fiber prepared by the present invention can synergistically improve the waterproof effect and the resistance to moist heat aging with other components.

[0080] In comparative example 2, the modified epoxy resin is not modified, and the waterproof effect and the resistance to moisture and heat aging are reduced, indicating that the modified epoxy resin prepared by the present invention can synergistically improve the waterproof effect and the resistance to moisture and heat aging with other components.

[0081] In comparative example 3, the ratio of modified polypropylene fiber and modified epoxy resin is different, and the waterproof effect and the resistance to moisture and heat aging effect are reduced, indicating that the two synergistically improve the waterproof effect and the resistance to moisture and heat aging effect.

[0082] Comparative Example 4 uses commercially available polypropylene fiber, and the waterproof effect and the resistance to moisture and heat aging are reduced, indicating that the synergistic improvement of the waterproof effect and the resistance to moisture and heat aging by the commercial product and other components is not ideal.

[0083] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A waterproof and moisture-proof polymer raised floor substrate, characterized in that: The composition comprises the following components in parts by weight: Magnesium oxysulfate base material: 40-60 parts of magnesium oxide, 20-30 parts of magnesium sulfate, 5-10 parts of alkali-resistant glass fiber cloth, 3-8 parts of plant fiber, and 2-6 parts of perlite; Polymer modified materials: 1-3 parts of modified polypropylene fiber, 2-4 parts of polyvinyl alcohol, 3-5 parts of modified epoxy resin, and 1-2 parts of polyurethane; the modified polypropylene fiber is prepared by modifying with perfluorooctyltriethoxysilane; the epoxy resin is prepared by modifying with nano-silicon dioxide; 10-15 parts of inorganic polymer gel liquid, 0.5-1.5 parts of functional additives.

2. The waterproof and moisture-proof polymer raised floor substrate according to claim 1, characterized in that: The functional additives include 0.3-0.8 parts of an anti-aging agent and 0.2-0.7 parts of an ultraviolet absorber.

3. The waterproof and moisture-proof polymer raised floor substrate according to claim 1, characterized in that: The high wear-resistant finishing layer is selected from marble, tile, wood or carpet patterns, and the finishing layer is bonded to the substrate by hot pressing or adhesive.

4. The waterproof and moisture-proof polymer raised floor substrate according to claim 1, characterized in that: The bottom of the substrate is provided with an opaque semi-sunk hole, which matches the support system to achieve seamless paving.

5. The waterproof and moisture-proof polymer raised floor substrate according to claim 1, characterized in that: The preparation method of modified polypropylene fiber comprises the following steps: (1) Raw material pretreatment: drying polypropylene particles; (2) Melt extrusion: Add polypropylene pellets into the screw extruder and heat to 200-260℃ to melt and form a uniform melt; (3) Spinning: The melt is extruded through a spinneret into primary fibers, which are then solidified by air cooling; (4) Immerse the polypropylene fiber in an ethanol solution of perfluorooctyltriethoxysilane at room temperature for 10-30 minutes, then take it out and dry it at 80-120°C; (5) Stretching and shaping: The fiber is stretched by multi-stage hot rollers to improve orientation and crystallinity; (6) Winding and collecting: The stretched fiber is wound into a tube to obtain modified polypropylene fiber.

6. The waterproof and moisture-proof polymer raised floor substrate according to claim 5, characterized in that: The concentration of the ethanol solution of perfluorooctyltriethoxysilane is 1-5 wt %.

7. The waterproof and moisture-proof polymer raised floor substrate according to claim 1, characterized in that: The preparation method of the modified epoxy resin comprises the following steps: (1) Weigh the following raw materials by mass: bisphenol A epoxy resin: 100 parts, fluorine-containing curing agent: 30-40 parts, fluorosilane coupling agent: 5-10 parts, nano-silica: 3-5 parts; (2) Ultrasonic dispersion of nano-silica and fluorosilane coupling agent in ethanol solution for 30 minutes to form hydrophobic nano-silica; (3) Heat the bisphenol A epoxy resin, add the fluorine-containing curing agent, stir until uniform, add the hydrophobized nano-silica, continue stirring, and vacuum degas; (4) The mixture is injected into a mold and step-cured to obtain a modified epoxy resin.

8. The waterproof and moisture-proof polymer raised floor substrate according to claim 7, characterized in that: The step curing procedure is: 80℃ / 2h, 120℃ / 3h, 150℃ / 1h.

9. A method for preparing a waterproof and moisture-proof polymer raised floor substrate according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Mix magnesium oxide, magnesium sulfate and water in proportion and stir to form a gel slurry; (2) Add alkali-resistant glass fiber cloth, plant fiber, perlite and inorganic polymer gel liquid to the slurry in sequence and mix them evenly; (3) Add modified polypropylene fiber, polyvinyl alcohol, modified epoxy resin, polyurethane and functional additives, and stir at high speed until a homogeneous mixture is formed; (4) The mixture is injected into a mold, formed by a pulse pressing process, and demolded after curing; (5) Surface treatment of the cured substrate, application of a highly wear-resistant finishing layer, and edge sealing with a flexible, impact-resistant material; (6) Semi-sunk holes are processed at specific positions at the four corners of the bottom of the substrate to complete the preparation of the finished product.

10. The preparation method according to claim 9, characterized in that The pressure of the pulse pressing process in step (4) is 10-15 MPa, the temperature is 50-70°C, and the curing time is 24-48 hours.

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