Hard floor with low size deformation and preparation method thereof

Abstract

The invention relates to the technical field of hard floors, in particular to a low-size deformation hard floor and a preparation method thereof. The chlorinated polyvinyl chloride base material for the hard floor is prepared from the following raw materials in parts by mass: 50 to 80 parts of chlorinated polyvinyl chloride, 10 to 20 parts of polyvinyl chloride, 5 to 12 parts of ethylene-vinyl acetate copolymer, 1 to 5 parts of compatilizer, 50 to 100 parts of activated wood flour, 100 to 200 parts of argil, 50 to 100 parts of light calcium carbonate, 1 to 3 parts of dispersing agent and 1 to 3 parts of gamma-glycidyl ether oxypropyl trimethoxy silane. 1-5 parts of a stabilizer, 1-2 parts of a foaming agent, 1-3 parts of a lubricant and 1-3 parts of a plasticizer. The floor is hard in texture, small in density, good in shrinkage performance, small in thermal expansion and cold contraction, not prone to buckling deformation after being laid, long in service life, simple in preparation method and suitable for large-scale application and popularization.

Description

Technical Field

[0001] This invention relates to the field of hard flooring technology, and more particularly to a low-dimensional deformation hard flooring and its preparation method. Background Technology

[0002] Wood-based panels are widely used in furniture manufacturing, construction, and processing industries due to their wide availability, diverse types, and ease of processing. In terms of their formed structure, wood-based panels can be broadly classified into solid wood panels, plywood, wood-plastic composite panels, laminated boards, and decorative panels.

[0003] Currently, flooring, as a core material in modern building decoration, has gained widespread market recognition for its fire-resistant, moisture-proof, and slip-resistant properties. Existing PVC boards are relatively soft, have a high rate of dimensional change when heated, and exhibit poor impact resistance and toughness, making them unsuitable for subsequent processing. However, with the expansion of application scenarios, especially the increase in high-intensity outdoor environments, their inherent shortcomings are becoming increasingly apparent.

[0004] Hard flooring, with its advantages such as fire resistance (B1 grade), moisture resistance, slip resistance, and comfortable feel, has become the mainstream choice for interior and exterior decoration, especially in the field of wood-plastic composite flooring replacement. Traditional flooring substrates generally maintain a high density. While high density gives the board initial rigidity, it leads to a significant decrease in impact strength. This makes the board prone to micro-stress concentration under dynamic loads (such as heavy object impact or frequent foot traffic), ultimately resulting in edge warping or overall buckling deformation.

[0005] Currently, adding fillers such as wood flour and lightweight calcium carbonate can reduce the density of the substrate, but the interfacial bonding with the resin matrix is ​​weak. Changes in humidity accelerate filler detachment due to moisture penetration, leading to further deterioration of dimensional stability. These problems are amplified in special scenarios such as outdoor photovoltaic floors and coastal boardwalks, becoming key factors restricting the application boundaries of rigid flooring. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a low-dimensional deformation rigid floor and its preparation method.

[0007] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring, comprising the following raw materials by weight: 50-80 parts chlorinated PVC, 10-20 parts PVC, 5-12 parts ethylene-vinyl acetate copolymer, 1-5 parts compatibilizer, 50-100 parts activated wood flour, 100-200 parts clay, 50-100 parts light calcium carbonate, 1-3 parts dispersant, 1-3 parts γ-glycidyl etheroxypropyltrimethoxysilane, 1-5 parts stabilizer, 1-2 parts foaming agent, 1-3 parts lubricant, and 1-3 parts plasticizer.

[0008] Preferably, the foaming agent includes sodium bicarbonate, zinc oxide, and foaming agent AC, with a mass ratio of 1:0.1-0.5:3-5.

[0009] Preferably, the lubricant is polyethylene wax.

[0010] Preferably, the stabilizer is a calcium-zinc stabilizer.

[0011] Preferably, the plasticizer is at least one of dioctyl terephthalate, epoxidized soybean oil, and dioctyl adipate.

[0012] Preferably, the activated wood flour is prepared by the following operation: soaking the wood flour in water and letting it stand for 1-2 hours, draining it, steam-exploding it, drying it, adding it to a sulfuric acid solution and ultrasonically treating it for 5-10 minutes, filtering, washing, drying, and pulverizing it; adding it to a solvent, adding terminal amino polyamide amine and stirring for 10-30 minutes, adding 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide, adjusting the pH of the system to 7-8, ultrasonically treating it at 50-60℃ for 1-2 hours, filtering, washing, vacuum drying, and pulverizing it.

[0013] Preferably, the solvent is an aqueous solution of methanol with a concentration of 40-60 wt%.

[0014] More preferably, the mass ratio of wood flour, amino-terminated polyamide amine, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and N-hydroxysuccinimide is 50-80:5-10:0.05-0.5:0.05-0.5. The algebraic number of the amino-terminated polyamide amine is 1.0-4.0.

[0015] More preferably, the frequency of ultrasonic treatment after adding to sulfuric acid solution is 60-70 kHz.

[0016] More preferably, the frequency of ultrasonic treatment after adjusting the pH of the system to 7-8 is 60-70 kHz.

[0017] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and dispersant to water, stir at 70-80℃ for 10-20 min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 1-2 h, filter, wash, vacuum dry, pulverize and sieve, add activated wood powder and clay and stir evenly to obtain premixed filler. S2. Mix chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and compatibilizer evenly at 80-90℃. Add stabilizer, foaming agent, lubricant, and plasticizer and stir evenly. Cool to 50-60℃, extrude at 190-220℃, and calender at 170-180℃.

[0018] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0019] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer from bottom to top on the surface of the chlorinated polyvinyl chloride material used for rigid flooring, processing it using a hydraulic process, and then covering the wear-resistant layer with a UV coating. Beneficial effects

[0020] This invention employs a blend of chlorinated polyvinyl chloride and polyvinyl chloride, with ethylene-vinyl acetate copolymer distributed as a toughening phase. When subjected to dynamic loads, the ethylene-vinyl acetate copolymer phase absorbs impact energy through shear deformation, while the chlorinated polyvinyl chloride phase maintains the overall structural stability, effectively suppressing the occurrence of microcracks caused by stress concentration. The synergistic effect of the three phases not only preserves the initial rigidity of the material but also delays fracture propagation through the introduction of the toughening phase.

[0021] This invention utilizes steam explosion treatment to form a porous structure from wood flour. The surface-grafted amino polyamide amine can be organically combined with the resin matrix through covalent bonds, which not only significantly improves the interfacial bonding force between the filler and the matrix, but also achieves efficient stress transfer through dendritic macromolecules, further reducing the phenomenon of microcrack propagation. Meanwhile, the light calcium carbonate modified with γ-glycidyl etheroxypropylsilane further enhances the compatibility between the inorganic filler and the organic matrix, forming a stable interfacial transition zone.

[0022] This invention uses a composite filler of lightweight calcium carbonate and clay. While reducing the product density, the layered structure of the clay inhibits water penetration. The clay layers form a physical barrier in the matrix, delaying the impact of changes in environmental humidity on the internal stress of the material. Meanwhile, the lightweight calcium carbonate can effectively fill and combine with the resin gaps, synergistically reducing the thermal expansion coefficient of the material, so that the flooring maintains low dimensional deformation when heated.

[0023] The flooring of this invention is not only hard and low in density, but also has good shrinkage performance, expands with heat and shrinks with cold, is not easy to warp or deform after installation, has a long service life, and is simple to prepare, making it suitable for large-scale promotion and application. Attached Figure Description

[0024] Figure 1 This is a comparison chart of the lateral and longitudinal dimensional change rates of chlorinated polyvinyl chloride materials obtained in Example 5 and Comparative Examples 1-2 under heating.

[0025] Figure 2 The graph shows a comparison of the heated warpage and static bending strength of the chlorinated polyvinyl chloride materials obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0026] The present invention will be further explained below with reference to specific embodiments.

[0027] Chlorinated polyvinyl chloride (PVC) was purchased from Shandong Mou Nuo New Materials Co., Ltd., with a chlorine content of 65-67%. The PVC itself was sourced from Manner Plastics, brand name 6906. The ethylene-vinyl acetate copolymer was sourced from BASF Yangzi, brand name V5110J. The maleic anhydride-grafted EVA used below was sourced from DuPont, USA, brand name 72D799. The calcium-zinc stabilizer used below was purchased from Hubei Mou Dongyi New Materials Technology Co., Ltd. The amino-terminated polyamide amine used below was from Hangzhou Mou Qiao Biotechnology Co., Ltd.

[0028] The solvent described below is an aqueous solution of methanol with a concentration of 50 wt%. Example 1

[0029] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 500g chlorinated PVC, 100g PVC, 50g ethylene-vinyl acetate copolymer, 10g maleic anhydride-grafted EVA, 500g activated wood flour, 1000g calcined kaolin, 500g light calcium carbonate, 10g Tween 80, 10g γ-glycidyl etheroxypropyltrimethoxysilane, 10g calcium-zinc stabilizer, 10g foaming agent, 10g polyethylene wax, and 10g epoxidized soybean oil.

[0030] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.1:3.

[0031] Activated wood flour is prepared as follows: 500g of 60-mesh wood flour is soaked in water and left to stand for 1 hour. After draining, it is added to a steam blasting machine for blasting at a pressure of 1 MPa. After drying, it is added to 1000g of 5% sulfuric acid solution and ultrasonically treated for 5 minutes at a frequency of 60kHz. After filtration, washing, drying, and pulverization, it is added to 1500g of solvent. 50g of 1.0-generation terminal amino polyamide amine is added to it and stirred at 1000r / min for 10 minutes. 0.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 0.5g of N-hydroxysuccinimide are added. The pH of the system is adjusted to 7-8. The system is ultrasonically treated at 50℃ for 1 hour at a frequency of 60kHz. After filtration, washing, vacuum drying, and pulverization, it is passed through a 100-mesh sieve.

[0032] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 2000g of deionized water, stir at 70℃ for 10min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 1h, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 80°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and epoxidized soybean oil are added and stirred evenly. The mixture is cooled to 50°C and then fed into a twin-screw extruder for extrusion (extrusion temperature is 190°C). Calendering is performed at 170°C with a calendering speed of 1 m / min and a calendering speed ratio of 1:1.1. The mixture is then discharged.

[0033] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0034] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer from bottom to top on the surface of the chlorinated polyvinyl chloride material used for rigid flooring, processing it using a hydraulic process (hydraulic temperature of 130°C and hydraulic pressure of 0.6MPa), and then covering the wear-resistant layer with a UV coating. Example 2

[0035] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 800g chlorinated PVC, 200g PVC, 120g ethylene-vinyl acetate copolymer, 50g maleic anhydride-grafted EVA, 1000g activated wood flour, 2000g calcined kaolin, 1000g light calcium carbonate, 30g Tween 80, 30g γ-glycidyl etheroxypropyltrimethoxysilane, 50g calcium-zinc stabilizer, 20g foaming agent, 30g polyethylene wax, and 30g dioctyl adipate.

[0036] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.5:5.

[0037] Activated wood flour was prepared as follows: 800g of 60-mesh wood flour was soaked in water and left to stand for 2 hours. After draining, it was added to a steam blasting machine and blasted at a pressure of 3MPa. After drying, it was added to 3000g of 5% sulfuric acid solution and ultrasonically treated for 10 minutes at a frequency of 70kHz. After filtration, washing, drying, and pulverization, it was added to 3000g of solvent. 100g of 4.0-generation terminal amino polyamide amine was added and stirred at 2000r / min for 30 minutes. 5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 5g of N-hydroxysuccinimide were added. The pH of the system was adjusted to 7-8. The system was ultrasonically treated at 60℃ for 2 hours at a frequency of 70kHz. After filtration, washing, vacuum drying, and pulverization, it was passed through a 100-mesh sieve.

[0038] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 4000g of deionized water, stir at 80℃ for 20min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 2h, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 90°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and dioctyl adipate are added and stirred evenly. The mixture is cooled to 60°C and fed into a twin-screw extruder for extrusion (extrusion temperature is 220°C). Calendering is performed at 180°C with a calendering speed of 1.4 m / min and a calendering speed ratio of 1:1.2. The mixture is then discharged.

[0039] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0040] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer from bottom to top on the surface of the chlorinated polyvinyl chloride material used for rigid flooring, processing it using a hydraulic process (hydraulic temperature of 140°C and hydraulic pressure of 0.8MPa), and then covering the wear-resistant layer with a UV coating. Example 3

[0041] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 600g chlorinated PVC, 180g PVC, 60g ethylene-vinyl acetate copolymer, 40g maleic anhydride-grafted EVA, 700g activated wood flour, 1800g calcined kaolin, 700g light calcium carbonate, 25g Tween 80, 15g γ-glycidyl etheroxypropyltrimethoxysilane, 40g calcium-zinc stabilizer, 12g foaming agent, 25g polyethylene wax, and 15g epoxidized soybean oil.

[0042] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.4:3.5.

[0043] Activated wood flour was prepared as follows: 700g of 60-mesh wood flour was soaked in water and allowed to stand for 80 minutes. After draining, it was added to a steam blasting machine and blasted at a pressure of 2.5 MPa. After drying, it was added to 1500g of 4% sulfuric acid solution and ultrasonically treated for 7 minutes at a frequency of 68 kHz. After filtration, washing, drying, and pulverization, it was added to 2000g of solvent. 90g of 2.0-generation terminal amino polyamide amine was added and stirred at 1800 r / min for 15 minutes. 4g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 4g of N-hydroxysuccinimide were added. The pH of the system was adjusted to 7-8. After ultrasonic treatment at 52℃ for 100 minutes at a frequency of 62 kHz, it was filtered, washed, vacuum dried, and pulverized through a 100-mesh sieve.

[0044] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 3500g of deionized water, stir at 73℃ for 18min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 80min, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 85°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and epoxidized soybean oil are added and stirred evenly. The mixture is cooled to 57°C and then fed into a twin-screw extruder for extrusion (extrusion temperature is 195°C). Calendering is performed at 177°C with a calendering speed of 1.2 m / min and a calendering speed ratio of 1:1.15. The mixture is then discharged.

[0045] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0046] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer from bottom to top on the surface of the chlorinated polyvinyl chloride material used for rigid flooring, processing it using a hydraulic process (hydraulic temperature of 133°C and hydraulic pressure of 0.75MPa), and then covering the wear-resistant layer with a UV coating. Example 4

[0047] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 700g chlorinated PVC, 120g PVC, 100g ethylene-vinyl acetate copolymer, 20g maleic anhydride-grafted EVA, 900g activated wood flour, 1200g calcined kaolin, 900g light calcium carbonate, 15g Tween 80, 25g γ-glycidyl etheroxypropyltrimethoxysilane, 20g calcium-zinc stabilizer, 18g foaming agent, 15g polyethylene wax, and 25g dioctyl adipate.

[0048] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.2:4.5.

[0049] Activated wood flour was prepared as follows: 600g of 60-mesh wood flour was soaked in water and allowed to stand for 100 minutes. After draining, it was added to a steam blasting machine and blasted at a pressure of 1.5MPa. After drying, it was added to 2500g of 3% sulfuric acid solution and ultrasonically treated for 9 minutes at a frequency of 62kHz. After filtration, washing, drying, and pulverization, it was added to 2400g of solvent. 70g of 3.0-generation terminal amino polyamide amine was added and stirred at 1200r / min for 25 minutes. 1g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 1g of N-hydroxysuccinimide were added. The pH of the system was adjusted to 7-8. After ultrasonic treatment at 58℃ for 80 minutes at a frequency of 68kHz, it was filtered, washed, vacuum dried, and pulverized through a 100-mesh sieve.

[0050] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 2500g of deionized water, stir at 77℃ for 12min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 100min, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 90°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and dioctyl adipate are added and stirred evenly. The mixture is cooled to 53°C and fed into a twin-screw extruder for extrusion (extrusion temperature is 215°C). Calendering is performed at 173°C with a calendering speed of 1.2 m / min and a calendering speed ratio of 1:1.15. The mixture is then discharged.

[0051] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0052] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer from bottom to top on the surface of the chlorinated polyvinyl chloride material used for rigid flooring, processing it using a hydraulic process (hydraulic temperature of 137°C and hydraulic pressure of 0.65MPa), and then covering the wear-resistant layer with a UV coating. Example 5

[0053] A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 650g chlorinated PVC, 150g PVC, 80g ethylene-vinyl acetate copolymer, 30g maleic anhydride-grafted EVA, 800g activated wood flour, 1500g calcined kaolin, 800g light calcium carbonate, 20g Tween 80, 20g γ-glycidyl etheroxypropyltrimethoxysilane, 30g calcium-zinc stabilizer, 15g foaming agent, 20g polyethylene wax, and 20g dioctyl terephthalate.

[0054] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.6:4.

[0055] The activated wood flour was prepared as follows: 650g of 60-mesh wood flour was soaked in water and allowed to stand for 90 minutes. After draining, it was added to a steam blasting machine and blasted at a pressure of 2MPa. After drying, it was added to 2000g of 5% sulfuric acid solution and ultrasonically treated for 8 minutes at a frequency of 65kHz. After filtration, washing, drying, and pulverization, it was added to 2200g of solvent. 80g of 2.0-generation terminal amino polyamide amine was added and stirred at 1500r / min for 20 minutes. 2.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 2.5g of N-hydroxysuccinimide were added. The pH of the system was adjusted to 7-8. After ultrasonic treatment at 55℃ for 90 minutes at a frequency of 65kHz, it was filtered, washed, vacuum dried, and pulverized through a 100-mesh sieve.

[0056] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 3000g of deionized water, stir at 75℃ for 15min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 90min, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 80°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and dioctyl terephthalate are added and stirred evenly. The mixture is cooled to 55°C and fed into a twin-screw extruder for extrusion (extrusion temperature is 205°C). Calendering is performed at 175°C with a calendering speed of 1.2 m / min and a calendering speed ratio of 1:1.15. The mixture is then discharged.

[0057] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0058] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer on the surface of the chlorinated polyvinyl chloride material for rigid flooring from bottom to top, processing it using a hydraulic process (hydraulic temperature of 135°C and hydraulic pressure of 0.7MPa), and then covering the wear-resistant layer with a UV coating.

[0059] Comparative Example 1 A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 650g chlorinated PVC, 150g PVC, 80g ethylene-vinyl acetate copolymer, 30g maleic anhydride-grafted EVA, 800g activated wood flour, 1500g calcined kaolin, 800g light calcium carbonate, 20g Tween 80, 20g γ-glycidyl etheroxypropyltrimethoxysilane, 30g calcium-zinc stabilizer, 15g foaming agent, 20g polyethylene wax, and 20g dioctyl terephthalate.

[0060] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.6:4.

[0061] Activated wood flour was prepared as follows: 650g of 60-mesh wood flour was added to 2000g of 5% sulfuric acid solution, ultrasonically treated for 8min at a frequency of 65kHz, filtered, washed, dried, and pulverized; then added to 2200g of solvent, 80g of 2.0-generation terminal amino polyamide amine was added, and stirred at 1500r / min for 20min, followed by the addition of 2.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and 2.5g of N-hydroxysuccinimide. The pH of the system was adjusted to 7-8, and ultrasonically treated at 55℃ for 90min at a frequency of 65kHz, filtered, washed, vacuum dried, and pulverized through a 100-mesh sieve.

[0062] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 3000g of deionized water, stir at 75℃ for 15min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 90min, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 80°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and dioctyl terephthalate are added and stirred evenly. The mixture is cooled to 55°C and fed into a twin-screw extruder for extrusion (extrusion temperature is 205°C). Calendering is performed at 175°C with a calendering speed of 1.2 m / min and a calendering speed ratio of 1:1.15. The mixture is then discharged.

[0063] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0064] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer on the surface of the chlorinated polyvinyl chloride material for rigid flooring from bottom to top, processing it using a hydraulic process (hydraulic temperature of 135°C and hydraulic pressure of 0.7MPa), and then covering the wear-resistant layer with a UV coating.

[0065] Comparative Example 2 A chlorinated polyvinyl chloride (PVC) flooring material for hard flooring comprises the following raw materials: 650g chlorinated PVC, 150g PVC, 80g ethylene-vinyl acetate copolymer, 30g maleic anhydride-grafted EVA, 800g activated wood flour, 1500g calcined kaolin, 800g light calcium carbonate, 20g Tween 80, 20g γ-glycidyl etheroxypropyltrimethoxysilane, 30g calcium-zinc stabilizer, 15g foaming agent, 20g polyethylene wax, and 20g dioctyl terephthalate.

[0066] The foaming agent is composed of sodium bicarbonate, zinc oxide, and foaming agent AC in a mass ratio of 1:0.6:4.

[0067] The activated wood flour was prepared by the following steps: 650g of 60-mesh wood flour was soaked in water and left to stand for 90 minutes. After draining, it was added to a steam blasting machine and blasted at a pressure of 2MPa. After drying, it was added to 2000g of 5% sulfuric acid solution and ultrasonically treated for 8 minutes at a frequency of 65kHz. After filtration, washing, drying, and pulverizing, 80g of 2.0 generation terminal amino polyamide amine was added and mixed evenly.

[0068] The preparation method of the above-mentioned chlorinated polyvinyl chloride flooring includes the following steps: S1. Add light calcium carbonate and Tween 80 to 3000g of deionized water, stir at 75℃ for 15min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 90min, filter, wash, vacuum dry, pulverize and pass through a 100-mesh sieve, add activated wood powder and calcined kaolin and stir evenly to obtain a premixed filler. S2. Chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and maleic anhydride-grafted EVA are mixed evenly at 80°C. Calcium-zinc stabilizer, foaming agent, polyethylene wax, and dioctyl terephthalate are added and stirred evenly. The mixture is cooled to 55°C and fed into a twin-screw extruder for extrusion (extrusion temperature is 205°C). Calendering is performed at 175°C with a calendering speed of 1.2 m / min and a calendering speed ratio of 1:1.15. The mixture is then discharged.

[0069] A low-dimensional deformation rigid flooring comprises, from top to bottom: a UV coating, an abrasion layer, a decorative layer, and the aforementioned chlorinated polyvinyl chloride material for rigid flooring.

[0070] The above-mentioned method for preparing low-dimensional deformation rigid flooring involves sequentially setting a decorative layer and a wear-resistant layer on the surface of the chlorinated polyvinyl chloride material for rigid flooring from bottom to top, processing it using a hydraulic process (hydraulic temperature of 135°C and hydraulic pressure of 0.7MPa), and then covering the wear-resistant layer with a UV coating.

[0071] The heating dimensional change rate and heating warpage of the chlorinated polyvinyl chloride (PVC) flooring obtained in Example 5 and Comparative Examples 1-2 were determined with reference to GB / T 11982.1-2015 "Polyvinyl chloride roll flooring - Part 1: Non-homogeneous polyvinyl chloride roll flooring".

[0072] The static bending strength of the chlorinated polyvinyl chloride (PVC) materials obtained in Example 5 and Comparative Examples 1-2 was determined in accordance with GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels".

[0073] like Figure 1 and Figure 2 As shown, the chlorinated polyvinyl chloride material obtained in Example 5 has the smallest heating dimensional change rate and heating warpage, while the largest static bending strength, which is better than Comparative Examples 1-2 (P<0.05).

[0074] The IIC sound insulation ratings of the hard flooring obtained in Example 5 and Comparative Examples 1-2 were determined according to ASTM E492. The IIC sound insulation rating of the hard flooring obtained in Example 5 was 75, the IIC sound insulation rating of the hard flooring obtained in Comparative Example 1 was 72, and the IIC sound insulation rating of the hard flooring obtained in Comparative Example 2 was 69.

[0075] The reasons for the above results are as follows: This invention uses chlorinated polyvinyl chloride and polyvinyl chloride blends, with ethylene-vinyl acetate copolymer distributed as a toughening phase. When subjected to dynamic loads, the ethylene-vinyl acetate copolymer phase absorbs impact energy through shear deformation, while the chlorinated polyvinyl chloride phase maintains the overall structural stability, effectively suppressing the occurrence of microcracks caused by stress concentration. The synergistic effect of the three phases not only preserves the initial rigidity of the material but also delays fracture propagation through the introduction of the toughening phase. Simultaneously, this invention utilizes steam explosion treatment of wood flour to form a porous structure. The surface-grafted amino polyamide amine can organically combine with the resin matrix through covalent bonds, which not only significantly improves the interfacial bonding force between the filler and the matrix but also achieves efficient stress transfer through dendritic macromolecules, further reducing microcrack propagation. Furthermore, the γ-glycidyl etheroxypropylsilane-modified light calcium carbonate further enhances the compatibility between the inorganic filler and the organic matrix, forming a stable interfacial transition zone.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A chlorinated polyvinyl chloride (PVC) material for rigid flooring, characterized in that, The raw materials, by weight, include: 50-80 parts of chlorinated polyvinyl chloride, 10-20 parts of polyvinyl chloride, 5-12 parts of ethylene-vinyl acetate copolymer, 1-5 parts of compatibilizer, 50-100 parts of activated wood flour, 100-200 parts of clay, 50-100 parts of light calcium carbonate, 1-3 parts of dispersant, 1-3 parts of γ-glycidyl etheroxypropyltrimethoxysilane, 1-5 parts of stabilizer, 1-2 parts of foaming agent, 1-3 parts of lubricant, and 1-3 parts of plasticizer.

2. The chlorinated polyvinyl chloride (PVC) flooring material for rigid flooring according to claim 1, characterized in that, Foaming agents include sodium bicarbonate, zinc oxide, and foaming agent AC.

3. The chlorinated polyvinyl chloride material for rigid flooring according to claim 1, characterized in that, The lubricant is polyethylene wax; the stabilizer is calcium-zinc stabilizer.

4. The chlorinated polyvinyl chloride (PVC) flooring material for rigid flooring according to claim 1, characterized in that, The plasticizer is at least one of dioctyl terephthalate, epoxidized soybean oil, and dioctyl adipate.

5. The chlorinated polyvinyl chloride material for rigid flooring according to claim 1, characterized in that, Activated wood flour is prepared by the following steps: Soak the wood flour in water and let it stand for 1-2 hours. After draining, steam explosion and drying are performed. The wood flour is then added to a sulfuric acid solution and ultrasonically treated for 5-10 minutes. After filtration, washing, drying, and pulverization, the wood flour is added to a solvent. Terminal amino polyamide amine is added and stirred for 10-30 minutes. 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide are added. The pH of the system is adjusted to 7-8. The wood flour is ultrasonically treated at 50-60℃ for 1-2 hours. After filtration, washing, vacuum drying, and pulverization, the wood flour is then added to the solvent.

6. The chlorinated polyvinyl chloride material for rigid flooring according to claim 5, characterized in that, The mass ratio of wood flour, amino-terminated polyamide amine, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide is 50-80:5-10:0.05-0.5:0.05-0.

5.

7. The chlorinated polyvinyl chloride (PVC) flooring material for rigid flooring according to claim 5, characterized in that, After being added to the sulfuric acid solution, the ultrasonic treatment frequency was 60-70 kHz; after adjusting the pH of the system to 7-8, the ultrasonic treatment frequency was 60-70 kHz.

8. A method for preparing chlorinated polyvinyl chloride flooring for rigid flooring as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Add light calcium carbonate and dispersant to water, stir at 70-80℃ for 10-20 min, adjust the pH of the system to 9-10, add γ-glycidyl oxypropyltrimethoxysilane and stir for 1-2 h, filter, wash, vacuum dry, pulverize and sieve, add activated wood powder and clay and stir evenly to obtain premixed filler. S2. Mix chlorinated polyvinyl chloride, polyvinyl chloride, ethylene-vinyl acetate copolymer, premixed filler, and compatibilizer evenly at 80-90℃. Add stabilizer, foaming agent, lubricant, and plasticizer and stir evenly. Cool to 50-60℃, extrude at 190-220℃, and calender at 170-180℃.

9. A low-dimensional deformation rigid floor, characterized in that, From top to bottom, including: UV coating, wear-resistant layer, decorative layer, and chlorinated polyvinyl chloride (PVC) flooring as described in any one of claims 1-7.

10. A method for preparing a low-dimensional deformation rigid floor as described in claim 9, characterized in that, A decorative layer and a wear-resistant layer are sequentially disposed on the surface of the chlorinated polyvinyl chloride material for hard flooring as described in any one of claims 1-7, processed by hydraulic pressing, and then a UV coating is applied to the surface of the wear-resistant layer.

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