Novel suspension floor and preparation method thereof

Abstract

The invention discloses a novel suspended floor and a preparation method thereof, the novel suspended floor comprises a laminated structure of a PVC wear-resistant layer, a PVC color film, a PVC surface layer bottom sheet, a first glass fiber gridding cloth, a PVC middle layer bottom sheet, a second glass fiber gridding cloth, a PVC first bottom layer bottom sheet, a PVC second bottom layer bottom sheet and a PVC foaming pad from top to bottom in sequence, and the hardness of the PVC foaming pad is Shore 0: 25-60. According to the invention, the problems of high cost, poor sound insulation, difficult recovery and the like of the suspension floor are systematically solved by removing the anti-skid layer and adopting the homogeneous PVC foaming mute pad and thermosetting adhesive laminating process, and the floor has technical advancement and industrial practicability, and is suitable for paving in multiple scenes such as home furnishing, business and the like.

Description

Technical Field

[0001] The present invention relates to the field of preparation of floor backsheets, in particular to a novel suspended floor and a preparation method thereof. Background Art

[0002] As a floor covering material, PVC flooring boasts excellent resistance to wear, stains, and chemicals, making it widely used both domestically and internationally. Currently, PVC flooring on the market is divided into two categories: non-locking and locking. Installation methods include adhesive-backed and locking. Adhesive-backed flooring requires manual application of glue before installation, which is labor-intensive, time-consuming, and difficult to remove. Locking-locking flooring, while easy to install, can break easily, causing damage to the floor. This is why floating flooring has emerged.

[0003] While currently available suspended floors offer good dimensional stability and thermal expansion coefficients, improvements in living standards are driving higher demands on sound insulation and foot comfort. Existing suspended floors suffer from the following drawbacks: 1) The back of the floor often uses a non-slip film with a steel plate texture, which prevents the soundproofing mat from being properly adhered to, resulting in poor sound insulation. 2) Low foot comfort: Existing products lack an elastic layer, making prolonged use prone to fatigue. 3) Recycling is difficult: The non-slip layer is inconsistent with the main material and requires separation, increasing recycling costs. Summary of the Invention

[0004] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention provides a new type of suspended floor and a preparation method thereof. The prepared floor is recyclable and can not only be installed in a suspended manner and easily replaced without the need for adhesive, but also has excellent sound insulation performance and a comfortable feel underfoot.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention can adopt the following technical solution: a new type of suspended floor, which includes, from top to bottom, a PVC wear-resistant layer, a PVC color film, a PVC surface layer film, a first glass fiber mesh cloth, a PVC middle layer film, a second glass fiber mesh cloth, a PVC first bottom layer film, a PVC second bottom layer film, and a stacked structure of a PVC foam pad, wherein the hardness of the PVC foam pad is Shore 0:25-60.

[0006] Furthermore, the formulas of the PVC surface layer film, the PVC middle layer film, the PVC first bottom layer film and the PVC second bottom layer film include the following components by mass: 100 parts of PVC resin, 20-70 parts of plasticizer, 1-10 parts of epoxidized soybean oil, 0.5-4 parts of calcium stearate, 0.5-4 parts of zinc stearate, 150-400 parts of filler, and 0-1 part of carbon black colorant.

[0007] Furthermore, the first glass fiber mesh cloth and the second glass fiber mesh cloth have a gram weight of 80-150 g / m2 , and are embedded between the PVC middle layer backing and the surface layer / bottom layer backing in an orthogonal direction; the mesh length of the first glass fiber mesh cloth and the second glass fiber mesh cloth is 1.8-2.2mm; the width is 1.8-2.2mm; the tensile strength in the length direction is greater than 150N / cm, and in the width direction is greater than 100N / cm.

[0008] Furthermore, the surface of the PVC foam pad is provided with a microporous structure, with a thickness of 0.6 to 1.5 mm and a density of 200 to 300 kg / m 3 The tensile strength range in MD and AMD directions is 0.8MPa~1.53MPa, and the static friction coefficient is 0.10-0.20.

[0009] Furthermore, the formula of the PVC foam pad is: 100 parts of PVC resin; 20-30 parts of plasticizer; 0.5-10 parts of foaming agent; and the recycled PVC content in the PVC foam pad is ≥30%.

[0010] Furthermore, the suspended floor is suitable for commercial places or home environments and has excellent sound insulation performance.

[0011] The preparation method of the novel suspended floor comprises the following steps:

[0012] A) Preparing PVC flooring substrate: Raw materials are mixed according to a formula, and subjected to high-speed mixing, cold mixing, and calendaring to prepare a PVC first bottom layer substrate, a PVC second bottom layer substrate, a PVC middle layer substrate, and a PVC surface layer substrate for use; the thickness of the PVC surface layer and middle layer substrates is 0.9-1.1 mm, and the thickness of the PVC first bottom layer substrate and the PVC second bottom layer substrate is 0.7-0.9 mm.

[0013] B) Hot pressing: According to the stacking structure order, hot pressing is carried out at 135-155°C and a pressure of 1.0-5.0 MPa for 20-40 minutes to obtain the semi-finished suspended floor;

[0014] C) UV heat treatment: Roll the semi-finished suspended floor to coat with a base layer of UV paint, and after UV curing, place it in hot water for tempering treatment;

[0015] D) Lamination: The semi-finished product after UV treatment is laminated with the PVC foam pad using thermosetting hot melt adhesive;

[0016] E) Standing and punching: The constant temperature room should ensure that the standing time is not less than 72 hours, and then punching to the required specifications at room temperature.

[0017] Furthermore, the preparation method in step A) comprises the following steps:

[0018] (1) Weigh the corresponding weight portions of each raw material according to the formula requirements, add PVC resin, plasticizer, epoxy soybean oil, calcium stearate, zinc stearate, and carbon black into a high-speed mixer, raise the temperature to 80-100°C, rotate at 200-350 r / min, and stir for 3-7 minutes;

[0019] (2) Unload the materials in the high-speed mixer into the cold mixer, and at the same time unload the measured filler into the cold mixer and stir for 8-15 minutes. The cold mixing temperature is 35-65°C. Unload the cold mixed materials into the storage tank for standby use;

[0020] (3) The material in the storage tank is sent to the internal mixer for preliminary plasticization, and then sent to the four-roll calender for plasticization and calendering into the corresponding bottom film with the required specifications and thickness;

[0021] Furthermore, in step C, the semi-finished floor is roller-coated with a base UV paint at a coating amount of 5-20 g / m 2 , after being cured by UV lamp, and then after UV curing, it enters hot water for tempering treatment.

[0022] Furthermore, in step D), PUR glue is used to adhere the PVC foam pad to the semi-finished product.

[0023] Beneficial effects: The present invention has the following advantages:

[0024] (1) The anti-slip layer of traditional suspended floors is removed, reducing costs: Traditional suspended floors usually have an anti-slip layer on the back, such as an anti-slip film or a steel plate texture layer, which requires additional materials such as rubber or composite coatings and processing steps such as embossing and coating. The present invention completely removes the anti-slip layer by optimizing the stacking structure design and instead relies on interlayer glass fiber mesh cloth (weight 80-150g / m 2 ) and the friction characteristics of the PVC foam pad achieve stable paving; in addition, the amount of anti-slip layer material is reduced by about 20%-30%, simplifying the production process and reducing energy consumption; the glass fiber mesh cloth enhances the bonding force between layers to avoid floor displacement, while the microporous structure on the surface of the PVC foam pad provides moderate friction resistance, with a static friction coefficient of 0.10-0.20.

[0025] (2) Setting up a PVC foam pad as a sound-proof layer can not only achieve the purpose of sound-proofing, but also can be recycled together with the floor, reducing the recycling process and lowering the production cost: the sound-proof layer of traditional suspended floors mostly uses EVA or rubber materials, which are inconsistent with the main material composition of PVC and need to be separated and processed; the present invention uses a PVC foam pad that is consistent with the main material composition as the sound-proof layer. The microporous structure of the foam pad can effectively absorb vibration noise, and the IIC value can reach 55; and the foam pad and the main body of the floor are both made of PVC material, which can be directly crushed and blended during recycling without the need for a separation process, and the recycling efficiency is increased by more than 40% (compared with the traditional material separation time is shortened by 50%).

[0026] (3) The laminating process of the sound-proof layer is to use thermosetting hot melt adhesive to laminarize large sheets and then carry out the cutting process. Thermosetting hot melt adhesive contains chemical functional groups, which can react chemically to form a stable chemical structure. Compared with ordinary hot melt adhesive, it has higher adhesion and longer shelf life: traditional hot melt adhesives such as EVA adhesive have poor temperature resistance and are easy to age, which causes the sound-proof layer to fall off; the present invention uses thermosetting polyurethane (PUR) adhesive for laminating. PUR adhesive contains isocyanate groups. After laminating, it undergoes cross-linking reaction with the hydroxyl groups on the surface of the PVC foam pad to form a three-dimensional network chemical structure. In addition, PUR adhesive has the following advantages: high adhesion and better peel strength; no debonding phenomenon in the environment of -20℃ to 80℃, and the service life is extended to more than 15 years; large sheets are punched out after laminating as a whole, reducing the waste of glue at the edges and corners, and increasing the glue utilization rate by 30%.

[0027] (4) The floor and the PVC foam pad give the floor an excellent sound insulation function, which is unattainable by traditional suspended floors: traditional suspended floors lack a dedicated silent layer and rely solely on the thickness of the base layer to adjust the sound insulation effect; the present invention achieves a breakthrough through the synergistic effect of the PVC foam pad and the stacked structure. Not only does the material absorb sound: the microporous structure of the foam pad absorbs medium and high frequency sound waves; it also achieves structural shock absorption: the glass fiber mesh cloth disperses stress and reduces vibration transmission. DETAILED DESCRIPTION

[0028] Example 1:

[0029] A new type of suspended floor comprises, from top to bottom, a laminated structure of a PVC wear-resistant layer, a PVC color film, a PVC surface film, a first glass fiber mesh cloth, a PVC middle film, a second glass fiber mesh cloth, a PVC first bottom film, a PVC second bottom film, and a PVC foam pad. The hardness of the PVC foam pad is Shore 0:50.

[0030] The formulas of the PVC surface layer film, the PVC middle layer film and the PVC bottom layer film include the following components by mass: 100 parts of PVC resin, 42 parts of plasticizer, 6 parts of epoxidized soybean oil, 1.6 parts of calcium stearate, 1.3 parts of zinc stearate, 300 parts of filler and 0.5 parts of carbon black colorant.

[0031] The weight of the first glass fiber mesh cloth and the second glass fiber mesh cloth is 100g / m 2 The first and second glass fiber meshes have meshes with a length of 1.8 mm and a width of 1.8 mm. Their tensile strength is >150 N / cm in the length direction and >100 N / cm in the width direction.

[0032] The surface of the PVC foam pad is provided with a microporous structure, with a thickness of 1.5 mm and a density of 256 kg / m3 The tensile strength in the MD direction is 1.40 MPa, the tensile strength in the AMD direction is 1.19 MPa, and the static friction coefficient is 0.15. The PVC foam mat's formula is: 100 parts PVC resin; 25 parts plasticizer; 2 parts foaming agent; and the recycled PVC content in the PVC foam mat is ≥ 30%. This new suspended floor is suitable for commercial or residential environments and offers excellent sound insulation.

[0033] Follow these steps to prepare the new suspended floor:

[0034] A) Production of PVC flooring backsheet:

[0035] (1) According to the requirements of the formula, weigh the corresponding weight parts of each raw material, add PVC resin, plasticizer, epoxy soybean oil, calcium stearate, zinc stearate carbon black into a high-speed mixer, raise the temperature to 80°C, rotate at 270r / min, and stir for 5min;

[0036] (2) The material in the high-speed mixer is unloaded into the cold mixer, and the measured filler is unloaded into the cold mixer and stirred for 5 minutes. The cold mixing temperature is 40°C. The cold mixed material is unloaded into the storage tank for standby use;

[0037] (3) The material in the storage tank is fed into an internal mixer for preliminary plasticization, and then fed to a four-roll calender for plasticization and calendering into the corresponding bottom film with the required specifications and thickness; the thickness of the PVC first bottom film and the PVC second bottom film is 0.83 mm, and the thickness of the PVC surface layer and middle layer film is 0.96 mm;

[0038] B) Press: Adjust the press temperature to 140° C. and stack the materials in the following order from bottom to top: PVC second bottom film, PVC first bottom film, first glass fiber mesh, PVC middle layer film, second glass fiber mesh, PVC surface layer film, PVC color film, and PVC wear-resistant layer. Insert the first and second glass fiber meshes orthogonally between the PVC middle layer film and the surface / bottom layer film and hot press for 30 minutes at a pressure of 4.0 MPa to obtain a semi-finished suspended floor.

[0039] C) UV heat treatment: Roller-coat the semi-finished floor with a base UV paint at a coating weight of 9g / m 2 , after being cured by UV lamp, and then after UV curing, it enters hot water for tempering;

[0040] D) Lamination: The semi-finished product after UV treatment is laminated with PVC foam pad through PUR adhesive, with a coating amount of 80g / m 2 ;

[0041] E) Standing and punching: The constant temperature room ensures that the standing time is not less than 72 hours before punching to the required specifications.

[0042] Example 2:

[0043] A new type of suspended flooring comprises, from top to bottom, a laminated structure consisting of a PVC wear-resistant layer, a PVC color film, a PVC surface film, a first fiberglass mesh, a PVC middle film, a second fiberglass mesh, a first PVC bottom film, a second PVC bottom film, and a PVC foam pad. The PVC foam pad has a Shore hardness of 0:55. The formulation of the PVC surface film, PVC middle film, and PVC bottom film comprises the following components by weight: 100 parts PVC resin, 36 parts plasticizer, 5 parts epoxidized soybean oil, 1.5 parts calcium stearate, 1.3 parts zinc stearate, 290 parts filler, and 1 part carbon black colorant.

[0044] The weight of the first glass fiber mesh and the second glass fiber mesh is 120g / m 2 The first and second glass fiber mesh fabrics are orthogonally embedded between the PVC middle layer and the surface / bottom layer. The mesh length and width of the first and second glass fiber mesh fabrics are 2.0 mm and 2.0 mm, respectively. The tensile strength is >150 N / cm in the longitudinal direction and >100 N / cm in the width direction.

[0045] The surface of the PVC foam pad is provided with a microporous structure, with a thickness of 1.0 mm and a density of 250 kg / m 3 The tensile strength range in the MD direction is 1.49 MPa, the tensile strength range in the AMD direction is 1.24 MPa, and the static friction coefficient is 0.16.

[0046] The PVC foam mat's formula is: 100 parts PVC resin, 20 parts plasticizer, and 2 parts foaming agent. The recycled PVC content in the PVC foam mat is ≥30%. The new suspended floor is suitable for commercial or residential environments and offers excellent sound insulation.

[0047] Follow these steps to prepare the new suspended floor:

[0048] A) Production of PVC flooring backsheet:

[0049] (1) According to the requirements of the formula, weigh the corresponding weight parts of each raw material, add PVC resin, plasticizer, epoxy soybean oil, calcium stearate, zinc stearate carbon black into a high-speed mixer, raise the temperature to 85°C, rotate at 280 r / min, and stir for 6 minutes;

[0050] (2) The material in the high-speed mixer is unloaded into the cold mixer, and the measured filler is unloaded into the cold mixer and stirred for 5 minutes. The cold mixing temperature is 40°C. The cold mixed material is unloaded into the storage tank for standby use;

[0051] (3) The material in the storage tank is fed into an internal mixer for preliminary plasticization, and then fed to a four-roll calender for plasticization and calendering into the corresponding bottom film with the required specifications and thickness; the thickness of the PVC second bottom film and the PVC first bottom film is 0.88 mm, and the thickness of the PVC middle layer film and the PVC surface layer film is 1.10 mm;

[0052] B) Pressing: Adjust the press temperature to 140° C. and stack the materials in the following order from bottom to top: PVC bottom sheet, first glass fiber mesh, PVC middle sheet, second glass fiber mesh, PVC surface sheet, PVC color film, and PVC wear-resistant layer. Insert the first and second glass fiber meshes orthogonally between the PVC middle sheet and the surface / bottom sheet and hot-press for 40 minutes at a pressure of 5.0 MPa to obtain a semi-finished suspended floor.

[0053] C) UV heat treatment: Roller-coat the semi-finished floor with a base UV paint at a coating weight of 9g / m 2 , after being cured by UV lamp, and then after UV curing, it enters hot water for tempering;

[0054] D) Lamination: The semi-finished product after UV treatment is laminated with PVC foam pad using PUR adhesive, with a coating amount of 75g / m 2 ;

[0055] E) Standing and punching: The constant temperature room ensures that the standing time is not less than 72 hours before punching to the required specifications.

[0056] Example 3:

[0057] A new type of suspended flooring comprises, from top to bottom, a laminated structure consisting of a PVC wear-resistant layer, a PVC color film, a PVC surface film, a first fiberglass mesh, a PVC middle film, a second fiberglass mesh, a first PVC bottom film, a second PVC bottom film, and a PVC foam pad. The PVC foam pad has a hardness of 0:55. The formulation of the PVC surface film, PVC middle film, and PVC bottom film comprises the following components by weight: 100 parts PVC resin, 42 parts plasticizer, 6 parts epoxidized soybean oil, 1.6 parts calcium stearate, 1.3 parts zinc stearate, 300 parts filler, and 1 part carbon black colorant.

[0058] The weight of the first glass fiber mesh and the second glass fiber mesh is 120g / m 2 The first and second glass fiber mesh fabrics are orthogonally embedded between the PVC middle layer and the surface / bottom layer. The mesh length and width of the first and second glass fiber mesh fabrics are 2.2 mm and 2.2 mm, respectively. The tensile strength is >150 N / cm in the longitudinal direction and >100 N / cm in the width direction.

[0059] The surface of the PVC foam pad is provided with a microporous structure, with a thickness of 1.0 mm and a density of 250 kg / m 3 The tensile strength in the MD direction is 1.49 MPa, the tensile strength in the AMD direction is 1.24 MPa, and the static friction coefficient is 0.16. The PVC foam mat's formula is: 100 parts PVC resin; 30 parts plasticizer; 8 parts foaming agent; and the recycled PVC content in the PVC foam mat is ≥ 30%. This new suspended floor is suitable for commercial or residential environments and offers excellent sound insulation.

[0060] Follow these steps to prepare the new suspended floor:

[0061] A) Production of PVC flooring backsheet:

[0062] (1) According to the requirements of the formula, weigh the corresponding weight parts of each raw material, add PVC resin, plasticizer, epoxy soybean oil, calcium stearate, zinc stearate carbon black into a high-speed mixer, raise the temperature to 80°C, rotate at 270r / min, and stir for 5min;

[0063] (2) The material in the high-speed mixer is unloaded into the cold mixer, and the measured filler is unloaded into the cold mixer and stirred for 5 minutes. The cold mixing temperature is 40°C. The cold mixed material is unloaded into the storage tank for standby use;

[0064] (3) The material in the storage tank is sent to the internal mixer for preliminary plasticization, and then sent to the four-roll calender for plasticization and calendering into the corresponding bottom film with the required specifications and thickness;

[0065] B) Pressing: Adjust the press temperature to 140° C. and stack the materials in the following order from bottom to top: a PVC second bottom film, a PVC second bottom film, a first glass fiber mesh, a PVC middle layer film, a second glass fiber mesh, a PVC surface layer film, a PVC color film, and a PVC wear-resistant layer. The first and second glass fiber meshes are orthogonally interposed between the PVC middle layer film and the surface / bottom layer film and hot-pressed for 30 minutes at a pressure of 4.0 MPa to obtain a semi-finished suspended floor. The thickness of the PVC second bottom film and the PVC first bottom film is 0.83 mm, and the thickness of the PVC middle layer film and the PVC surface layer film is 0.96 mm.

[0066] C) UV heat treatment: Roller-coat the semi-finished floor with a base UV paint at a coating weight of 9g / m 2 , after being cured by UV lamp, and then after UV curing, it enters hot water for tempering;

[0067] D) Lamination: The semi-finished product after UV treatment is laminated with PVC foam pad using PUR glue, with a glue weight of 75g / m 2 ;

[0068] E) Standing and punching: The constant temperature room ensures that the standing time is not less than 72 hours before punching to the required specifications.

[0069] Comparative Example 1:

[0070] The other process steps are the same as those in Example 3, except that the PVC foam pad is not included, an anti-slip film is provided on the back, and anti-slip is achieved by embossing the steel plate.

[0071] Comparative test:

[0072] 1) Impact sound insulation was tested on the floor products of Example 3 and Comparative Example 1. Test method: Testing was performed according to EN492 and evaluation was performed according to ASTM E989.

[0073] 2) The finished flooring products of Example 3 and Comparative Example 1 were tested for their coefficient of thermal expansion. The flooring was placed in water at room temperature for 2 hours, then heated to 50° C. for 2 hours. The dimensional changes before and after the heating were measured.

[0074] 3) The floor products of Example 3 and Comparative Example 1 were tested for residual depression according to ASTM F1914.

[0075] 4) The finished floor products of Example 3 and Comparative Example 1 were tested for dimensional stability. The test method was as follows:

[0076] Tested according to ASTM F2199 standard.

[0077] 5) The recovery rates of the finished floor products of Example 3 and Comparative Example 1 were compared: Comparative Example 1 is a traditional suspended floor, and the separation of the silent layer and the main PVC material requires mechanical crushing and flotation, which takes 10 minutes per piece of floor and has a recovery rate of 70%. The new suspended floor prepared in Example 3 can be directly crushed and blended, which takes 2 minutes per piece of floor and has a recovery rate of 95%.

[0078] Table 1 Comparison of floor performance tests prepared in Example 3 and Comparative Example 1

[0079] performance Example 3 Comparative Example 1 Impact Sound Insulation (IIC) 55 27 Coefficient of thermal expansion (MD) 2.32E-05 5.15E-05 Coefficient of thermal expansion (AMD) 2.08E-05 5.76E-05 Residual concavity 6.93％ 6.90％ Dimensional stability (MD) -0.06％ -0.08％ Dimensional stability (AMD) -0.07％ -0.05％

[0080] Data explanation: The larger the IIC, the better the impact sound insulation performance; for other performance indicators, the smaller the value (negative value compared to absolute value), the better the performance.

[0081] As can be seen from the test data in Table 1, the present invention systematically solves the problems of high cost, poor sound insulation, and difficult recycling of suspended floors by removing the anti-slip layer and adopting a homogeneous PVC foam silent pad and a thermosetting adhesive bonding process. The impact sound insulation performance of the floor prepared by the present invention is significantly better than that of traditional suspended floors, and other floor performance is also significantly better than that of traditional suspended floors.

Claims

1. A new type of suspended floor, characterized by: The laminated structure includes, from top to bottom, a PVC wear-resistant layer, a PVC color film, a PVC surface film, a first glass fiber mesh cloth, a PVC middle film, a second glass fiber mesh cloth, a PVC first bottom film, a PVC second bottom film, and a PVC foam pad. The hardness of the PVC foam pad is Shore 0:25-60.

2. The novel suspended floor according to claim 1 is characterized in that: The formulas of the PVC surface layer film, the PVC middle layer film, the PVC first bottom layer film and the PVC second bottom layer film include the following components by mass: 100 parts of PVC resin, 20-70 parts of plasticizer, 1-10 parts of epoxidized soybean oil, 0.5-4 parts of calcium stearate, 0.5-4 parts of zinc stearate, 150-400 parts of filler and 0-1 part of carbon black colorant.

3. The novel suspended floor according to claim 1 is characterized in that: The weight of the first glass fiber mesh cloth and the second glass fiber mesh cloth is 80-150g / m 2 , and are embedded between the PVC middle layer backing and the surface layer / bottom layer backing in an orthogonal direction; the mesh length of the first glass fiber mesh cloth and the second glass fiber mesh cloth is 1.8-2.2mm; the width is 1.8-2.2mm; the tensile strength in the length direction is greater than 150N / cm, and in the width direction is greater than 100N / cm.

4. The novel suspended floor according to claim 1 is characterized by: The surface of the PVC foam pad is provided with a microporous structure, with a thickness of 0.6-1.5 mm and a density of 200-300 kg / m 3 The tensile strength range in MD and AMD directions is 0.8MPa~1.53MPa, and the static friction coefficient is 0.10-0.

20.

5. The novel suspended floor according to claim 1 is characterized by: The formula of the PVC foam pad is: 100 parts of PVC resin; 20-30 parts of plasticizer; 0.5-10 parts of foaming agent; and the content of recycled PVC in the PVC foam pad is ≥30%.

6. The novel suspended floor according to claim 1 is characterized in that Suitable for commercial or home environments, with excellent sound insulation performance.

7. A method for preparing the novel suspended floor according to claim 1, characterized in that The steps include: A) Preparing PVC flooring substrate: Raw materials are mixed according to a formula, and subjected to high-speed mixing, cold mixing, and calendaring to prepare a PVC first bottom layer substrate, a PVC second bottom layer substrate, a PVC middle layer substrate, and a PVC surface layer substrate for use; the thickness of the PVC surface layer and middle layer substrates is 0.9-1.1 mm, and the thickness of the PVC first bottom layer substrate and the PVC second bottom layer substrate is 0.7-0.9 mm. B) Hot pressing: According to the stacking structure order, hot pressing is carried out at 135-155°C and a pressure of 1.0-5.0 MPa for 20-40 minutes to obtain the semi-finished suspended floor; C) UV heat treatment: Roll the semi-finished suspended floor to coat with a base layer of UV paint, and after UV curing, place it in hot water for tempering treatment; D) Lamination: The semi-finished product after UV treatment is laminated with the PVC foam pad using thermosetting hot melt adhesive; E) Standing and punching: The constant temperature room should ensure that the standing time is not less than 72 hours, and then punching to the required specifications at room temperature.

8. The method for preparing the novel suspended floor according to claim 7, characterized in that: The preparation method in step A) comprises the following steps: (1) Weigh the corresponding weight portions of each raw material according to the formula requirements, add PVC resin, plasticizer, epoxy soybean oil, calcium stearate, zinc stearate, and carbon black into a high-speed mixer, raise the temperature to 80-100°C, rotate at 200-350 r / min, and stir for 3-7 minutes; (2) Unload the materials in the high-speed mixer into the cold mixer, and at the same time unload the measured filler into the cold mixer and stir for 8-15 minutes. The cold mixing temperature is 35-65°C. Unload the cold mixed materials into the storage tank for standby use; (3) The material in the storage tank is sent to the internal mixer for preliminary plasticization, and then sent to the four-roll calender for plasticization and calendering into the corresponding bottom film with the required specifications and thickness; 9. The method for preparing the novel suspended floor according to claim 7, characterized in that: In step C, the semi-finished floor is coated with a base UV paint by roller, with a coating amount of 5-20g / m 2 , after being cured by UV lamp, and then after UV curing, it enters hot water for tempering treatment.

10. The method for preparing the novel suspended floor according to claim 7, characterized in that: In step D), the PVC foam pad is bonded to the semi-finished product using PUR glue.