Composite plastic floor and preparation method therefor

Abstract

A composite plastic floor and a preparation method therefor, relating to the technical field of composite floors. The composite plastic floor comprises a first base material layer, a cork layer, a second base material layer, a wear-resistant layer, and a coating which are sequentially stacked; the thickness of the cork layer is greater than the thickness of the first base material layer and the thickness of the second base material layer, and the density of the cork layer is 0.18-0.3 g / cm3; and the materials of the first base material layer and the second base material layer independently comprise 20-50 wt% of polyvinyl chloride and 50-80 wt% of stone powder. In the composite plastic floor, the cork layer has a large thickness, and when the composite plastic floor is used as a floor, the composite plastic floor has a good noise reduction effect, and it is comfortable to walk on the floor; the addition of the cork layer can also significantly reduce the density of the composite plastic floor and reduce the transportation cost of the composite plastic floor; and the wear-resistant layer can improve the wear resistance of the composite plastic floor.

Description

Composite plastic floor and preparation method thereof

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 5, 2023, with application number CN202310820852.4 and invention name “A composite plastic floor and its preparation method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the technical field of composite floors, and in particular to a composite plastic floor and a preparation method thereof. Background Art

[0003] Common floor covering materials include ceramic tiles, wood flooring, and carpets. These materials are often sourced from natural resources. However, the long-term overexploitation of natural resources has had a significant impact on the ecological environment. With the improvement of living standards, the demand for floor covering materials is growing. The challenge is to effectively develop and comprehensively utilize natural resources, comply with energy conservation and environmental protection standards, and ensure that these materials are aesthetically pleasing, economical, practical, meet diverse user needs, and provide a certain level of comfort. The trend is to utilize composite and synthetic methods to produce floor covering materials.

[0004] For example, Chinese patent CN201687165A discloses a PVC cork composite floor, which includes a base layer, a PVC layer and a cork layer. The PVC layer is hot-pressed and laminated on the base layer, and the cork layer is applied to the bottom surface of the base layer and bonded to the base layer. Different patterns are printed on the PVC surface layer, and the patterns are covered with a wear-resistant layer. The base layer is formed by mixing stone powder and resin. The solid wood decorative floor composited with the cork substrate has the characteristics of flame retardancy, corrosion resistance, good elasticity and good sound absorption, but its noise reduction effect is not good enough.

[0005] Summary of the Invention

[0006] In view of this, an object of the present invention is to provide a composite plastic floor and a preparation method thereof. The composite plastic floor provided by the present invention has excellent noise reduction effect.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a composite plastic floor, comprising a first base material layer, a cork layer, a second base material layer, a wear-resistant layer and a coating layer stacked in sequence;

[0009] The thickness of the cork layer is greater than that of the first substrate layer, and the thickness of the cork layer is greater than that of the second substrate layer; the density of the cork layer is 0.18 to 0.3 g / cm 3 ;

[0010] The materials of the first substrate layer and the second substrate layer independently include 20-50 wt% of polyvinyl chloride and 50-80 wt% of stone powder.

[0011] Preferably, the thickness of the cork layer, the first substrate layer and the second substrate layer are independently 0.5 to 5 mm.

[0012] Preferably, the material of the wear-resistant layer includes 65-90 wt% of polyvinyl chloride, 9-34 wt% of plasticizer and 0.3-1 wt% of stabilizer;

[0013] The thickness of the wear-resistant layer is 0.06-1.0 mm.

[0014] Preferably, the coating is made of polyurethane resin; the surface density of the coating is 5 to 50 g / m 2 .

[0015] Preferably, a pattern layer is further provided between the second base material layer and the wear-resistant layer;

[0016] The pattern layer comprises a polyvinyl chloride layer and a pattern located on the surface of the polyvinyl chloride layer; the thickness of the pattern layer is 0.05 to 0.07 mm.

[0017] The present invention provides a method for preparing the composite plastic flooring described in the above technical solution, comprising the following steps:

[0018] (1) laying a wear-resistant layer on the surface of the second substrate and performing hot pressing to obtain a fabric layer;

[0019] (2) The cork layer and the first substrate layer are sequentially bonded to the surface of the second substrate of the fabric layer, and paint is applied to the surface of the wear-resistant layer of the fabric layer and then cured to obtain a composite plastic floor.

[0020] The present invention provides a method for preparing the composite plastic floor according to the above technical solution, which is characterized by comprising the following steps:

[0021] (1) laying a wear-resistant layer on the surface of the second substrate and performing hot pressing to obtain a fabric layer;

[0022] (2) bonding the first substrate layer and the cork layer to obtain a substrate-cork layer;

[0023] (3) bonding the second substrate layer of the fabric layer to the cork layer of the substrate-cork layer, coating the surface of the wear-resistant layer of the fabric layer with paint and then curing the paint to obtain a composite plastic floor;

[0024] There is no chronological order for steps (1) and (2).

[0025] Preferably, when the composite plastic floor further includes a patterned layer, the step of laying the wear-resistant layer on the surface of the second substrate is replaced by laying the patterned layer and the wear-resistant layer in sequence on the surface of the second substrate.

[0026] Preferably, the preparation method of the first substrate layer comprises the following steps: mixing polyvinyl chloride and stone powder, performing banburying and then calendering to obtain the first substrate layer;

[0027] The preparation method of the second substrate layer is the same as the preparation method of the first substrate layer.

[0028] Preferably, the method for preparing the wear-resistant layer comprises the following steps: mixing polyvinyl chloride, a plasticizer and a stabilizer, performing banburying and then calendering to obtain the wear-resistant layer.

[0029] The present invention provides a composite plastic floor, comprising a first substrate layer, a cork layer, a second substrate layer, a wear-resistant layer, and a coating layer stacked in sequence; the thickness of the cork layer is greater than that of the first substrate layer, and the thickness of the cork layer is greater than that of the second substrate layer; the density of the cork layer is 0.18 to 0.3 g / cm3; the materials of the first and second substrate layers independently include 20 to 50 wt% polyvinyl chloride and 50 to 80 wt% stone powder. In the composite plastic floor provided by the present invention, the thickness of the cork is greater than that of the single substrate layer (the first substrate layer and the second substrate layer), and the thickness of the cork layer is large. When used as a floor, the composite plastic floor has an excellent noise reduction effect, is low in noise, and is comfortable to walk on. The addition of the cork layer can also significantly reduce the density of the composite plastic floor, reducing the transportation cost of the composite plastic floor. The presence of the wear-resistant layer can improve the wear resistance of the composite plastic floor. The presence of the coating can protect the composite plastic floor from scratches and improve the gloss and aesthetics of the composite plastic floor.

[0030] The present invention provides a method for preparing the composite plastic flooring according to the above technical solution. The preparation method provided by the present invention has a simple production process, simple operation, low production cost, and is suitable for industrial production. DETAILED DESCRIPTION

[0031] The present invention provides a composite plastic floor, comprising a first substrate layer, a cork layer, a second substrate layer, a wear-resistant layer and a coating layer stacked in sequence; the thickness of the cork layer is greater than that of the first substrate layer, and the thickness of the cork layer is greater than that of the second substrate layer.

[0032] The composite plastic floor provided by the present invention includes a first substrate layer; the material of the first substrate layer includes: 20-50wt% polyvinyl chloride (PVC), preferably 25-45wt%, more preferably 30-40wt%; the polyvinyl chloride preferably includes PVC resin powder SG-5 and / or PVC resin powder SG-8; and 50-80wt% stone powder, preferably 55-75wt%, more preferably 60-70wt%. In the present invention, the stone powder is preferably calcium powder, and the particle size of the stone powder is preferably 100-600 mesh, more preferably 150-500 mesh, and even more preferably 150-400 mesh. In the present invention, the thickness of the first substrate layer is preferably 0.5-5mm, and more preferably 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm.

[0033] The composite plastic floor provided by the present invention comprises a cork layer located on the surface of the first substrate layer. In the present invention, the density of the cork layer is 0.18 to 0.3 g / cm 3 , more preferably 0.2 to 0.24 g / cm 3 In the present invention, the thickness of the cork layer is preferably 0.5 to 5 mm, and more preferably 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm.

[0034] The composite plastic flooring provided by the present invention includes a second substrate layer positioned on the surface of the cork layer. The second substrate layer comprises: 20-50 wt% polyvinyl chloride (PVC), preferably 25-45 wt% and more preferably 30-40 wt% polyvinyl chloride (PVC); the PVC preferably comprises PVC resin powder SG-5 and / or PVC resin powder SG-8; and 50-80 wt% stone powder (preferably 55-75 wt% and more preferably 60-70 wt%). In the present invention, the stone powder is preferably calcium powder, and the particle size of the stone powder is preferably 100-600 mesh, more preferably 150-500 mesh, and even more preferably 150-400 mesh. In the present invention, the thickness of the second substrate layer is preferably 0.5-5 mm, and more preferably 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm.

[0035] The composite plastic flooring provided by the present invention preferably further includes a patterned layer located on the surface of the second substrate layer. The patterned layer preferably comprises a polyvinyl chloride layer and a pattern located on the surface of the polyvinyl chloride layer. The present invention does not particularly limit the pattern, and any pattern familiar to those skilled in the art can be used. The presence of the patterned layer enhances the aesthetics of the composite plastic flooring. In the present invention, the thickness of the patterned layer is preferably 0.05 to 0.07 mm, more preferably 0.055 to 0.065 mm, and even more preferably 0.06 mm.

[0036] The composite plastic floor provided by the present invention includes a wear-resistant layer located on the surface of the pattern layer; the material of the wear-resistant layer preferably includes: 65-90wt% polyvinyl chloride, more preferably 69.08-69.61wt%, and further preferably 69.4wt%; 9-34wt% plasticizer, more preferably 29.8-30.2wt%, and further preferably 30wt%; 0.3-1wt% stabilizer, more preferably 0.59-0.61wt%, and further preferably 0.6wt%. In the present invention, the plasticizer preferably includes dioctyl terephthalate (DOTP); the stabilizer preferably includes calcium zinc stabilizer. In the present invention, the thickness of the wear-resistant layer is preferably 0.06-1mm, more preferably 0.2-0.8mm, and further preferably 0.5-0.7mm.

[0037] The composite plastic floor provided by the present invention includes a coating located on the surface of the wear-resistant layer, wherein the material of the coating is preferably polyurethane resin (PU resin); the paint amount of the coating is preferably 5 to 50 g / m 2 , more preferably 10 to 40 g / m 2 , more preferably 10 to 30 g / m 2 .

[0038] The present invention provides a method for preparing the composite plastic flooring described in the above technical solution, comprising the following steps:

[0039] (1) laying a wear-resistant layer on the surface of the second substrate and performing hot pressing to obtain a fabric layer;

[0040] (2) The cork layer and the first substrate layer are sequentially bonded to the surface of the second substrate of the fabric layer, and paint is applied to the surface of the wear-resistant layer of the fabric layer and then cured to obtain a composite plastic floor.

[0041] Unless otherwise specified, the raw materials used in the present invention are all commercially available products.

[0042] In the present invention, the method for preparing the substrate layer preferably includes the following steps: mixing polyvinyl chloride and stone powder, performing banburying (referred to as the first banburying) and then calendering (referred to as the first calendering) to obtain a first substrate layer; the method for preparing the second substrate layer is the same as the method for preparing the first substrate layer. In the present invention, the temperature of the first banburying is preferably 165-175°C, more preferably 168-172°C, and further preferably 170°C; the time of the first banburying is preferably 7-9 minutes, more preferably 7.5-8.5 minutes, and further preferably 8 minutes. In the present invention, the temperature of the first calendering is preferably 168-172°C, more preferably 169-171°C, and further preferably 170°C; the speed of the first calendering is preferably 19.5-20.5 m / min, more preferably 19.8-20.2 m / min, and further preferably 20 m / min. After the first calendering, the present invention preferably further includes winding the obtained substrate layer.

[0043] In the present invention, the method for preparing the wear-resistant layer preferably includes the following steps: mixing polyvinyl chloride, a plasticizer, and a stabilizer, performing banburying (referred to as the second banburying), and then calendering (referred to as the second calendering) to obtain the wear-resistant layer. In the present invention, the conditions of the second banburying and the second calendering are preferably the same as the conditions of the first banburying and the first calendering, and are not further described herein.

[0044] The present invention lays a wear-resistant layer on the surface of the second substrate and performs hot pressing (referred to as the first hot pressing) to obtain a fabric layer. In the present invention, when the composite plastic floor further includes a patterned layer, laying the wear-resistant layer on the surface of the second substrate is replaced by laying the patterned layer and the wear-resistant layer on the surface of the second substrate in sequence. In the present invention, the temperature of the first hot pressing is preferably 138-142°C, more preferably 139-141°C, and further preferably 140°C; the first hot pressing preferably includes a first stage of hot pressing, a second stage of hot pressing, and a third stage of hot pressing in sequence; the pressure of the first stage of hot pressing is preferably 4.9-5.1 MPa, more preferably 5 MPa, and the time of the first stage of hot pressing is preferably 4.5-5.5 min, more preferably 5 min; the pressure of the second stage of hot pressing is preferably 5.9-6.1 MPa, more preferably 6 MPa, and the time of the second stage of hot pressing is preferably 14.5-15.5 min, more preferably 15 min; the pressure of the third stage of hot pressing is preferably 7.9-8.1 MPa, more preferably 8 MPa, and the time of the third stage of hot pressing is preferably 19.5-20.5 min, more preferably 20 min.

[0045] After obtaining the fabric layer, the present invention sequentially bonds (referred to as the first bonding) the cork layer and the first substrate layer to the second substrate surface of the fabric layer, and then coats (referred to as the first coating) the paint on the wear-resistant layer surface of the fabric layer and cures (referred to as the first curing) the paint to obtain the composite plastic floor; the sequential bonding and coating have no time sequence. In the present invention, the adhesive used for the first bonding preferably includes PUR hot melt adhesive or two-component AB adhesive, and the adhesive amount of the first bonding is preferably 30 to 80 g / m 2 , more preferably 40 to 70 g / m 2 , more preferably 50 to 60 g / m 2 In the present invention, the first coating is preferably roller coating, and the present invention has no special limitation on the roller coating, and can obtain a surface density of 5 to 50 g / m 2 In the present invention, the temperature of the first curing is preferably room temperature, the first curing is preferably ultraviolet curing, and the present invention has no special limitation on the time of the first curing, as long as a dry coating can be formed.

[0046] The present invention provides a method for preparing the composite plastic flooring described in the above technical solution, comprising the following steps:

[0047] (1) laying a wear-resistant layer on the surface of the second substrate and performing hot pressing (referred to as the second hot pressing) to obtain a fabric layer;

[0048] (2) bonding the first substrate layer and the cork layer (referred to as the second bonding) to obtain a substrate-cork layer;

[0049] (3) bonding the second base material layer of the fabric layer to the cork layer of the base material-cork layer (referred to as the third bonding), coating the surface of the wear-resistant layer of the fabric layer (referred to as the second coating) with paint and then curing it (referred to as the second curing) to obtain a composite plastic floor;

[0050] There is no chronological order for steps (1) and (2).

[0051] In the present invention, the conditions of the second hot pressing are preferably the same as those of the first hot pressing, the conditions of the second bonding and the third bonding are preferably the same as those of the first bonding; the method of the second coating is preferably the same as that of the first coating, and the conditions of the second curing are the same as those of the first curing, which will not be repeated here.

[0052] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] In the following examples and comparative examples, polyvinyl chloride: PVC resin powder SG-8; calcium powder particle size is 150-400 mesh; the density of cork is 0.2-0.4 g / cm 3 ; Plasticizer DOTP; calcium zinc stabilizer was purchased from Hunan Jiaxin New Materials Technology Co., Ltd.; PU resin was purchased from Hunan Sunshine New Materials Co., Ltd.

[0054] Example 1

[0055] The first substrate layer is made of 30% polyvinyl chloride (PVC) and 70% calcium powder. The thickness of the first substrate layer is 1 mm. The first substrate layer is prepared by uniformly mixing the polyvinyl chloride and calcium powder, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the first substrate layer.

[0056] Cork layer: 0.2~0.4g / cm 3 , thickness 2mm.

[0057] The second substrate layer is made of 30% polyvinyl chloride (PVC) and 70% calcium powder. The thickness of the second substrate layer is 1 mm. The second substrate layer is prepared by uniformly mixing the polyvinyl chloride and calcium powder, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the second substrate layer.

[0058] Pattern layer: PVC layer and patterns on the surface of the PVC layer, the thickness of the pattern layer is 0.07 mm.

[0059] The wear-resistant layer is made of 69.4% polyvinyl chloride (PVC), 30% DOTP (DOTP), and 0.6% calcium zinc stabilizer (CaZn). The thickness of the wear-resistant layer is 0.5 mm. The wear-resistant layer is prepared by uniformly mixing PVC, DOTP, and CaZn stabilizer, kneading at 170°C for 8 minutes, and rolling at 170°C at a speed of 50 m / min to obtain the wear-resistant layer.

[0060] Coating: paint amount is 15g / m 2 .

[0061] The preparation method of composite plastic floor is as follows:

[0062] The pattern layer and the wear-resistant layer are sequentially laid on the surface of the second substrate, and hot pressed at 140°C and 5MPa for 5 minutes, at 140°C and 6MPa for 15 minutes, and at 140°C and 8MPa for 20 minutes to obtain the fabric layer.

[0063] The cork layer and the first substrate layer are sequentially bonded to the second substrate surface of the fabric layer, and PU resin is rolled on the wear-resistant layer surface of the fabric layer and then UV-cured at room temperature to obtain a composite plastic floor. The adhesive used for bonding is a two-component AB glue with a glue amount of 80g / m 2 The density of composite plastic flooring is 1.28g / cm 3 The shrinkage rate was tested twice, 0.05% and 0.01% respectively; the noise measured by the tapping method was 52-55 decibels.

[0064] Example 2

[0065] The first substrate layer is made of 25% polyvinyl chloride (PVC) and 75% calcium powder. The thickness of the first substrate layer is 0.7 mm. The first substrate layer is prepared by uniformly mixing the polyvinyl chloride and calcium powder, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the first substrate layer.

[0066] Cork layer: 0.2~0.4g / cm 3 , thickness 1.5mm.

[0067] The second substrate layer is made of 25% polyvinyl chloride (PVC) and 75% calcium powder. The thickness of the second substrate layer is 0.8 mm. The second substrate layer is prepared by uniformly mixing the polyvinyl chloride and calcium powder, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the second substrate layer.

[0068] Pattern layer: PVC layer and patterns on the surface of the PVC layer, the thickness of the pattern layer is 0.07 mm.

[0069] The wear-resistant layer is made of 72% polyvinyl chloride (PVC), 27.6% DOTP (DOTP), and 0.4% calcium zinc stabilizer (CaZn). The thickness of the wear-resistant layer is 0.3 mm. The wear-resistant layer is prepared by uniformly mixing PVC, DOTP, and CaZn stabilizer, kneading at 170°C for 8 minutes, and rolling at 170°C at a speed of 50 m / min to obtain the wear-resistant layer.

[0070] Coating: paint amount is 12g / m 2 .

[0071] The preparation method of composite plastic floor is as follows:

[0072] The pattern layer and the wear-resistant layer are sequentially laid on the surface of the second substrate, and hot pressed at 140°C and 5MPa for 5 minutes, at 140°C and 6MPa for 15 minutes, and at 140°C and 8MPa for 20 minutes to obtain the fabric layer.

[0073] The cork layer and the first substrate layer are sequentially bonded to the second substrate surface of the fabric layer, and PU resin is rolled on the wear-resistant layer surface of the fabric layer and then UV-cured at room temperature to obtain a composite plastic floor. The adhesive used for bonding is PUR hot melt adhesive, and the amount of adhesive is 50g / m 2 The density of composite plastic flooring is 1.3g / cm 3 ; The shrinkage rate was tested twice, both times were 0.09%.

[0074] Example 3

[0075] The first substrate layer is made of 50% polyvinyl chloride (PVC) and 50% calcium powder (CaP). The thickness of the first substrate layer is 2 mm. The first substrate layer is prepared by uniformly mixing the PVC and CaP, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the first substrate layer.

[0076] Cork layer: 0.2~0.4g / cm 3 , thickness 4mm.

[0077] The second substrate layer is made of 50% polyvinyl chloride (PVC) and 50% calcium powder (CaP). The thickness of the second substrate layer is 2 mm. The second substrate layer is prepared by uniformly mixing the PVC and CaP, kneading them at 170°C for 8 minutes, and rolling them at 170°C at a speed of 50 m / min to obtain the second substrate layer.

[0078] Pattern layer: PVC layer and patterns on the surface of the PVC layer, the thickness of the pattern layer is 0.07 mm.

[0079] The wear-resistant layer is made of 72% polyvinyl chloride (PVC), 27.6% DOTP (DOTP), and 0.4% calcium zinc stabilizer (CaZn). The thickness of the wear-resistant layer is 0.7 mm. The wear-resistant layer is prepared by uniformly mixing PVC, DOTP, and CaZn stabilizer, kneading at 170°C for 8 minutes, and rolling at 170°C at a speed of 50 m / min to obtain the wear-resistant layer.

[0080] Coating: paint volume is 25g / m 2 .

[0081] The preparation method of composite plastic floor is as follows:

[0082] The pattern layer and the wear-resistant layer are sequentially laid on the surface of the second substrate, and hot pressed at 140°C and 5MPa for 5 minutes, at 140°C and 6MPa for 15 minutes, and at 140°C and 8MPa for 20 minutes to obtain the fabric layer.

[0083] The cork layer and the first substrate layer are sequentially bonded to the second substrate surface of the fabric layer, and PU resin is rolled on the wear-resistant layer surface of the fabric layer and then UV-cured at room temperature to obtain a composite plastic floor. The adhesive used for bonding is a two-component AB glue with a glue amount of 80g / m 2 The density of composite plastic flooring is 1.29g / cm 3 ; The shrinkage rate was tested twice, which were 0.09% and -0.01% respectively.

[0084] Comparative Example 1

[0085] A composite plastic floor was prepared according to the method of Example 1. The only difference from Example 1 was that the positions of the cork layer and the first substrate layer were swapped (i.e., the cork layer was located at the bottom layer). The noise of the composite plastic floor measured by the tapping method was 70-74 decibels.

[0086] Comparative Example 2

[0087] A composite plastic floor was prepared according to the method of Example 1. The only difference from Example 1 was that the composite plastic floor did not contain a cork layer. The noise of the composite plastic floor measured by the tapping method was 79 to 83 decibels.

[0088] The above is only 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 composite plastic floor, characterized in that: It comprises a first substrate layer, a cork layer, a second substrate layer, a wear-resistant layer and a coating layer stacked in sequence; The density of the cork layer is 0.18-0.3 g / cm 3 ; The materials of the first substrate layer and the second substrate layer independently include 20-50 wt % of polyvinyl chloride and 50-80 wt % of stone powder.

2. The composite plastic floor according to claim 1, characterized in that: The thickness of the cork layer, the first substrate layer and the second substrate layer are independently 0.5 to 5 mm.

3. The composite plastic floor according to claim 1 or 2, characterized in that: The particle size of the stone powder is 100-600 meshes.

4. The composite plastic floor according to claim 1, characterized in that: The material of the wear-resistant layer includes 65-90wt% polyvinyl chloride, 9-34wt% plasticizer and 0.3-1wt% stabilizer; The thickness of the wear-resistant layer is 0.06-1.0 mm.

5. The composite plastic floor according to claim 4, characterized in that: The plasticizer includes dioctyl terephthalate.

6. The composite plastic floor according to claim 4, characterized in that: The stabilizer includes a calcium zinc stabilizer.

7. The composite plastic floor according to claim 1, characterized in that: The coating is made of polyurethane resin; the coating paint volume is 5-50g / m 2 .

8. The composite plastic floor according to claim 1 or 2, characterized in that: A pattern layer is also provided between the second substrate layer and the wear-resistant layer; The pattern layer comprises a polyvinyl chloride layer and a pattern located on the surface of the polyvinyl chloride layer; the thickness of the pattern layer is 0.05-0.07 mm.

9. The method for preparing the composite plastic floor according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) laying a wear-resistant layer on the surface of the second substrate, and performing a first hot pressing to obtain a fabric layer; (2) A first cork layer and a first substrate layer are sequentially bonded on the second substrate surface of the fabric layer, and paint is coated on the wear-resistant layer surface of the fabric layer and then cured to obtain a composite plastic floor.

10. The preparation method according to claim 9, characterized in that: The temperature of the first hot pressing is 138-142°C; the first hot pressing includes a first stage of hot pressing, a second stage of hot pressing and a third stage of hot pressing in sequence; the pressure of the first stage of hot pressing is 4.9-5.1 MPa, and the time is 4.5-5.5 min; the pressure of the second stage of hot pressing is 5.9-6.1 MPa, and the time is 14.5-15.5 min; the pressure of the third stage of hot pressing is 7.9-8.1 MPa, and the time is 19.5-20.5 min.

11. The preparation method according to claim 9, characterized in that: The adhesive used in the first bonding includes PUR hot melt adhesive or two-component AB adhesive; the adhesive amount of the first bonding is 30-80g / m 2 .

12. The method for preparing the composite plastic floor according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) laying a wear-resistant layer on the surface of the second substrate, and performing a second hot pressing to obtain a fabric layer; (2) bonding the first substrate layer and the cork layer for a second time to obtain a substrate-cork layer; (3) bonding the second substrate layer of the fabric layer to the cork layer of the substrate-cork layer for the third time, coating the surface of the wear-resistant layer of the fabric layer with paint and curing the paint to obtain a composite plastic floor; There is no chronological order between step (1) and step (2).

13. The preparation method according to claim 12, characterized in that: The temperature of the second hot pressing is 138-142°C; the second hot pressing includes a first stage of hot pressing, a second stage of hot pressing and a third stage of hot pressing in sequence; the pressure of the first stage of hot pressing is 4.9-5.1 MPa, and the time is 4.5-5.5 min; the pressure of the second stage of hot pressing is 5.9-6.1 MPa, and the time is 14.5-15.5 min; the pressure of the third stage of hot pressing is 7.9-8.1 MPa, and the time is 19.5-20.5 min.

14. The preparation method according to claim 12, characterized in that: The adhesive used in the second bonding includes PUR hot melt adhesive or two-component AB adhesive; the adhesive amount of the second bonding is 30-80g / m 2 .

15. The preparation method according to claim 12, characterized in that: The adhesive used in the third bonding includes PUR hot melt adhesive or two-component AB adhesive; the adhesive amount of the third bonding is 30-80g / m 2 .

16. The preparation method according to any one of claims 9 to 15, characterized in that: When the composite plastic floor further includes a pattern layer, the step of laying a wear-resistant layer on the surface of the second substrate is replaced by: laying a pattern layer and a wear-resistant layer in sequence on the surface of the second substrate.

17. The preparation method according to claim 9 or 12, characterized in that: The method for preparing the first substrate layer comprises the following steps: The polyvinyl chloride and the stone powder are mixed, and a first internal kneading and a first calendering are performed to obtain a first substrate layer; The preparation method of the second substrate layer is the same as the preparation method of the first substrate layer.

18. The preparation method according to claim 9 or 12, characterized in that: The preparation method of the wear-resistant layer comprises the following steps: The polyvinyl chloride, the plasticizer and the stabilizer are mixed, and the mixture is subjected to a second internal kneading and a second calendering to obtain a wear-resistant layer.