Recyclable rigid PVC floor and preparation method thereof

Abstract

The present application relates to the technical field of PVC floor, in particular to a recyclable hard PVC floor and a preparation method thereof.The hard PVC floor comprises six layers, from bottom to top, a mute layer, a base material layer, a color film layer, a wear-resistant layer, a primer layer and a topcoat layer.The mute layer is a PVC foamed pad, which can be recycled with the floor without pre-peeling, is green and environmentally friendly, reduces the recycling procedure and production cost, improves the residual indentation of the floor, and has better effect than other mute layers of the same specification and better sound insulation effect than other mute layers of the same specification;the mute layer improves the sprayable printing traceability code to realize "one product one code", so as to better recycle the product and greatly reduce the operation and production cost;the pressure of the cold pressing is 7-13 MPa, and the temperature of the cold pressing is 25-35 DEG C, which effectively avoids the problem of reduced fastness caused by the precipitation of plasticizer in the mute layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PVC floor, in particular, relates to a recyclable rigid PVC floor and a preparation method thereof. BACKGROUND

[0002] PVC floor is a light ground decoration material, which refers to the floor produced by polyvinyl chloride material, specifically refers to the floor produced by polyvinyl chloride and its copolymer resin as the main raw material, adding filler, plasticizer, stabilizer, colorant and other auxiliary ingredients, on the sheet-shaped continuous substrate, using calendering or coating process. PVC floor has the characteristics of bright and beautiful appearance, good wear resistance, dirt resistance and good anti-skid performance, which has excellent stability and durability, which not only solves the problem of deformation and mildew of solid wood floor due to moisture, but also solves the problem of formaldehyde of other decoration materials.

[0003] CN212427950U discloses a wear-resistant PVC floor film, which comprises a wear-resistant layer, a base layer, an adhesive layer and a protective layer arranged in turn from top to bottom, a reinforcing net is bonded between the wear-resistant layer and the base layer, the reinforcing net is a grid woven by metal filaments; a buffer layer is arranged between the reinforcing net and the wear-resistant layer, and a waterproof and scratch-resistant layer is connected to the side of the wear-resistant layer away from the buffer layer. The utility model has the effects of good tear resistance and not being easily torn when subjected to horizontal direction tension. However, the present application uses IXPE (polyethylene foaming material, foaming cotton) as the mute layer, which cannot be directly recycled because it is inconsistent with the main material above during recycling, and needs to be peeled off in advance for recycling, which complicates the recycling process and increases labor costs. SUMMARY

[0004] In order to overcome the deficiencies in the background art, the present application provides a recyclable rigid PVC (polyvinyl chloride) floor and a preparation method thereof, which not only has the excellent performance of traditional rigid PVC floor, but also uses PVC foaming pad as the mute pad, which can be recycled with the floor, simplifying the recycling process, reducing labor and saving cost. At the same time, through a specific process, the foaming pad effectively solves the residual indentation between the floor and the floor, and the sound insulation effect is better than that of other mute layers of the same specification. In addition, the PVC floor uses physical technology to print traceability code, which is connected with the database to realize individual traceability and tracking of the product.

[0005] The first aspect of the present application provides a rigid PVC floor, which comprises 6 layers, from bottom to top, a mute layer, a base material layer, a color film layer, a wear-resistant layer, a primer layer and a topcoat layer.

[0006] The thickness of the sound-silencing layer is 1.0-5.0 mm, the thickness of the substrate layer is 3.0-6.0 mm, the thickness of the color filter layer is 0.03-0.1 mm, and the thickness of the wear-resistant layer is 0.1-0.8 mm.

[0007] The sound-absorbing layer is a PVC foam pad, which can be recycled along with the flooring without prior stripping, making it environmentally friendly, reducing recycling difficulties, and lowering production costs. Typically, the sound-absorbing layer used in PVC flooring is IXPE (polyethylene foam, foam cotton). Specifically, such as... Figure 1 As shown, the PVC foam pad selected in this invention has a similar rheological curve to the substrate layer, which further simplifies the post-processing procedure after recycling. Further research found that the thickness of the sound-absorbing layer is 1.0-5.0mm, which effectively improves the residual indentation of the floor and the sound insulation effect. As the thickness increases, the sound insulation effect improves, but excessive thickness will affect the residual indentation to a certain extent. When the thickness of the sound-absorbing layer is 1.0-5.0mm, it promotes the bonding strength with the substrate layer. The specific thickness reduces the interlayer stress after bonding.

[0008] Preferably, the material of the sound-absorbing layer is PVC foam pad.

[0009] Preferably, the thickness ratio of the sound-absorbing layer to the substrate layer is 1:(2-4).

[0010] More preferably, the thickness ratio of the sound-absorbing layer to the substrate layer is 1:3.7.

[0011] More preferably, the sound-absorbing layer has a thickness of 1mm and is purchased from Ningbo Fangyi Rubber & Plastic Products Co., Ltd.

[0012] Preferably, the thickness ratio of the color filter layer to the wear-resistant layer is 1:(3-6).

[0013] More preferably, the thickness ratio of the color filter layer to the wear-resistant layer is 7:30.

[0014] More preferably, the thickness of the color film layer is 0.07 mm and the thickness of the wear-resistant layer is 0.3 mm, both of which are purchased from Guangdong Sanyu Plastics Co., Ltd.

[0015] By weight, the components of the substrate layer include: 90-120 parts of PVC resin, 6-10 parts of stabilizer, 0.6-2 parts of external lubricant, 0.8-1.2 parts of internal lubricant, 100-250 parts of grinding powder, 0.3-0.5 parts of colorant, 2-8 parts of CPE (chlorinated polyethylene), 2-8 parts of impact modifier, and 100-400 parts of stone powder.

[0016] The PVC resin has a degree of polymerization of 600-1000 and an apparent density of 0.5-0.7 g / mL.

[0017] Preferably, the PVC resin has a polymerization degree of 670-750 and an apparent density of 0.54-0.62 g / mL, and is commercially available from Qilu Petrochemical, model S-700.

[0018] The weight ratio of the external lubricant, the internal lubricant, and the CPE is (0.5-1) : (0.5-1) : (5-7).

[0019] Preferably, the weight ratio of the external lubricant, the internal lubricant, and the CPE is 1:1.1:6.

[0020] The weight ratio of the external lubricant, the internal lubricant, and the CPE is (0.5-1) : (0.5-1) : (5-7), which can improve the pressing efficiency between the substrate layer, the color film layer, and the wear-resistant layer. The external lubricant and the internal lubricant can reduce the mutual friction between the particles of each material before the PVC is melted and the macromolecules after the PVC is melted, and can also reduce the mutual friction between the PVC melt and the inner cavity of the screw extruder, thereby improving the production efficiency and effectively preventing the PVC degradation caused by the heat generated by friction. However, too much lubricant is not easy to stick to the roller during calendering, and may cause the screw to slip during extrusion. The addition of appropriate CPE reduces the amount of lubricant added to a certain extent, improves the processability of the substrate layer, and the total amount of the polar segment with good compatibility between CPE and PVC is small, so that the entire substrate layer system starts to plasticize at a lower temperature, thereby promoting the melting and plasticization.

[0021] The stabilizer includes a mixture of one or more of calcium-zinc composite stabilizer, epoxide, phosphite, thioester, sulfide, hindered phenol, polyol or ester thereof, and β-diketone compound.

[0022] Preferably, the stabilizer includes a calcium-zinc composite stabilizer, which is commercially available from Yixing Shunfa Chemical Co., Ltd.

[0023] The internal lubricant includes at least one of metal soap, oxidized polyethylene wax, and stearic acid.

[0024] Preferably, the internal lubricant includes stearic acid, which is commercially available from Guangzhou Taili Chemical Co., Ltd., model Green Bao 1801.

[0025] The external lubricant includes at least one of zinc stearate, calcium stearate, EBS, and PE wax.

[0026] Preferably, the external lubricant includes PE wax, brand Dow Chemical, model NV-202P.

[0027] The impact modifier includes one of ACR and ABS.

[0028] Preferably, the impact modifier includes ACR (acrylate copolymer), which is commercially available from Shandong Ruifeng High Polymer Material Co., Ltd.

[0029] Preferably, the grinding material includes stone plastic floor, the average particle size is 4mm, which is produced by our company.

[0030] Preferably, the CPE is purchased from Shandong Shangguan New Material Technology Co., Ltd., model: SG-A-10.

[0031] The colorant includes at least one of titanium dioxide and carbon black.

[0032] Preferably, the colorant includes titanium dioxide, model R-298 from Gaoyi Yongchang Zinc Industry Co., Ltd.

[0033] The stone powder includes at least one of coal gangue powder, marble powder and granite powder.

[0034] Preferably, the stone powder has a mesh size of 600-2000 mesh.

[0035] Further preferably, the stone powder includes coal gangue powder, has a mesh size of 1250 mesh, and is purchased from Chuzhou Wanjuan New Material Co., Ltd.

[0036] The second aspect of the application provides a preparation method of a recyclable hard PVC floor, including the following steps:

[0037] S1, weighing the corresponding weight parts of each raw material in the base material layer, mixing uniformly, and cold mixing;

[0038] S2, conveying to a double-screw extruder for plasticizing extrusion to obtain a stone plastic base material;

[0039] S3, using a five-roller laminating device, placing the stone plastic base material between the first roller and the second roller to obtain a base material layer; laminating the color film layer and the wear-resistant layer on the third roller; and performing calendering on the fourth roller and the fifth roller to composite the base material layer, the color film layer and the wear-resistant layer;

[0040] S4, coating a primer on the surface of the wear-resistant layer, curing to obtain a primer layer, coating a topcoat on the surface of the primer layer, curing to obtain a topcoat layer, cooling to obtain a floor semi-finished product;

[0041] S5, gluing the surface of the base material layer of the floor semi-finished product, laminating a soundproof layer, cold pressing, and collecting materials;

[0042] S6, performing multi-edge sawing, milling, and laser jet printing a two-dimensional code on the surface of the soundproof layer, and obtaining the product.

[0043] The thickness of the base material layer is 3-6mm.

[0044] Preferably, the thickness of the base material layer is 3.7mm.

[0045] The temperature of the one roller, two rollers, three rollers is 180-190℃, the temperature of the four rollers, five rollers is 70-100℃, the speed of the calendering is 1 5m / min.

[0046] Preferably, the temperature of the one roller, two rollers is 185℃, the temperature of the three rollers is 180℃, the temperature of the four rollers, five rollers is 85℃.

[0047] The speed ratio of the one roller and two rollers, three rollers, four rollers and five rollers is 1: (1.05 1): (1.2-1.4).

[0048] Preferably, the speed ratio of the one roller and two rollers, three rollers, four rollers and five rollers is 1: (1.05 1): 1.3.

[0049] Further preferably, the speed ratio of the one roller, two rollers: three rollers: four rollers, five rollers is 1: 1.07: 1.3.

[0050] The coating amount of the primer is 7-12g / m2, the coating amount of the topcoat is 10-15g / m2, the curing energy of the primer is 350-600mj / cm2, the curing energy of the topcoat is 700-900mj / cm2.

[0051] Preferably, the coating amount of the primer is 9g / m2, the coating amount of the topcoat is 12g / m2, the curing energy of the primer is 400mj / cm2, the curing energy of the topcoat is 800mj / cm2.

[0052] Although the mute layer is PVC foamed pad, which can be recycled with the floor, reducing the difficulty of recycling and reducing production cost, but currently PVC foamed pad is not widely used in PVC floor field, the technical resistance encountered by the industry is the lack of adhesive and process of the adhesion of PVC foamed pad and PVC base material layer, the applicant found that using solidification reaction type hot melt adhesive can improve the long-term bonding performance of the base material layer and the mute layer, the solidification reaction type hot melt adhesive forms a proper crosslinking network between the layers, balancing the internal stress between the adhesive layers. Further research found that the viscosity of the adhesive is 6000-9000 mPa•s, which can improve the production efficiency and the bonding performance with the base material layer, the viscosity is too low, which is easy to cause porous and glue leakage phenomenon, the viscosity is too large, the fluidity is reduced, which affects the infiltration and penetration of the base material, further research found that the open time is 90-150 s, the amount of adhesive is 60~90g / m2, which can improve the bonding performance with the base material layer and further improve the production efficiency, the open time is matched with the viscosity of the adhesive and the amount of adhesive, which further promotes the uniformity of the adhesive layer, thereby improving the bonding strength. The cold pressing pressure is 7~13MPa, the cold pressing temperature is 25-35℃, and the cold pressing time is 3-6min, which effectively avoids the problem of reduced firmness caused by the precipitation of plasticizer in the PVC foamed pad, and improves the penetration of the adhesive to the PVC foamed pad.

[0053] Preferably, the adhesive comprises solidification reaction type hot melt adhesive.

[0054] Preferably, the viscosity (120℃) of the adhesive is 6000-9000 mPa•s, and the open time is 90-150 s.

[0055] Further preferably, the viscosity of the adhesive is 6000-7500 mPa•s, and the open time is 100-130 s.

[0056] More preferably, the viscosity (120℃) of the adhesive is 6800 mPa•s, the open time is 120 s, and the product model is AD-8613L.

[0057] Preferably, the amount of adhesive is 60~90g / m2.

[0058] Further preferably, the amount of adhesive is 75g / m2.

[0059] The cold pressing pressure is 7~13MPa, the cold pressing temperature is 25-35℃, and the cold pressing time is 3-6min.

[0060] Further preferably, the cold pressing pressure is 10MPa, the cold pressing temperature is 28℃, and the cold pressing time is 5min.

[0061] The applicant finds that the traceability code can be sprayed on the soundproof pad by physical technology to realize "one product one code", and the user can obtain the information of the product including recycling information and component information by scanning the traceability code with a mobile phone or other equipment, so as to better recycle the product, and the enterprise can better understand the market dynamics to develop the use product meeting the needs of customers, and the operation and production cost is greatly reduced, but the traceability code sprayed on the existing soundproof pad material is not clear enough, and the scanning recognition rate is too low, the PVC foamed pad subjected to heat treatment is selected in the application, and the spraying parameters are optimized, the feeding speed of the sprayed two-dimensional code is 80-100 m / min, the marking speed is 1000-2000 mm / s, the frequency is 70-100 kHz, and the laser power is 50-80%, so that the two-dimensional code scanning success rate can be further improved while the high production efficiency is maintained.

[0062] The feeding speed of the sprayed two-dimensional code is 80-100 m / min, the marking speed is 1000-2000 mm / s, the frequency is 70-100 kHz, and the laser power is 50-80%.

[0063] Preferably, the feeding speed of the sprayed two-dimensional code is 90 m / min, the marking speed is 1500 mm / s, the frequency is 85 kHz, and the laser power is 65%.

[0064] Beneficial effects

[0065] 1. The soundproof layer is a PVC foamed pad, which can be recycled with the floor without pre-peeling, is green and environmentally friendly, reduces the recycling procedure and production cost, improves the floor residual indentation, and has better effect than other soundproof layers of the same specification.

[0066] 2. The pressure of the cold pressing is 7-13 MPa, and the temperature of the cold pressing is 25-35 DEG C, so that the problem of reduced firmness caused by the precipitation of plasticizer in the soundproof layer is effectively avoided.

[0067] 3. The PVC foamed pad subjected to heat treatment is selected, and the spraying parameters are optimized, the feeding speed of the sprayed two-dimensional code is 80-100 m / min, the marking speed is 1000-2000 mm / s, the frequency is 70-100 kHz, and the laser power is 50-80%, so that the two-dimensional code scanning success rate can be further improved while the high production efficiency is maintained.

[0068] 4. The glue includes a solidification reaction type hot melt glue, the viscosity of the glue is 6000-9000 mPa•s, and the open time is 90-150 s, so that the long-term bonding effect of the soundproof pad can be improved, and the soundproof pad is not peeled off after being placed at 50 DEG C for 3 months. BRIEF DESCRIPTION OF DRAWINGS

[0069] Figure 1Rheological curves of the PVC floor containing the quiet layer and the PVC floor not containing the quiet layer prepared in Example 1.

[0070] Figure 2 The two-dimensional code topography printed for Example 1.

[0071] Figure 3 The two-dimensional code topography printed for Comparative Example 1. DETAILED DESCRIPTION

[0072] Example 1

[0073] A rigid PVC floor, which is 6 layers, from bottom to top, a quiet layer, a substrate layer, a color film layer, a wear-resistant layer, a primer layer, and a topcoat layer.

[0074] The quiet layer has a thickness of 1 mm and is purchased from Ningbo Fangyi Rubber and Plastic Products Co., Ltd.

[0075] The color film layer has a thickness of 0.07 mm and the wear-resistant layer has a thickness of 0.3 mm, both of which are purchased from Guangdong San Yu Plastic Industry Co., Ltd.

[0076] The components of the substrate layer by weight parts are: PVC resin 100 parts, stabilizer 7 parts, external lubricant 1 part, internal lubricant 1.1 parts, mill powder 190 parts, colorant 0.4 parts, CPE (chlorinated polyethylene) 6 parts, impact modifier 3 parts, and stone powder 250 parts.

[0077] The PVC resin has a polymerization degree of 670-750 and an apparent density of 0.54-0.62 g / mL, and is purchased from Qilu Petrochemical, model: S-700.

[0078] The stabilizer is a calcium-zinc composite stabilizer, which is purchased from Yixing Shunfa Chemical Co., Ltd.

[0079] The internal lubricant is stearic acid, which is purchased from Guangzhou Taili Chemical Co., Ltd., model: Lvbao 1801.

[0080] The external lubricant is PE wax, brand: Dow Chemical, model: NV-202P.

[0081] The impact modifier is ACR (acrylate copolymer), which is purchased from Shandong Ruifeng High Polymer Material Co., Ltd.

[0082] The mill powder is stone plastic floor, with an average particle size of 4 mm, which is self-produced by the company.

[0083] The colorant is titanium white powder, which is purchased from Yongchang Zinc Industry Co., Ltd., model: R-298.

[0084] The stone powder is coal gangue powder, the mesh number is 1250 meshes, and is purchased from Chuzhou Wanjuan New Material Co., Ltd.

[0085] A preparation method of a recyclable hard PVC floor comprises the following steps:

[0086] S1, weighing corresponding weight parts of each raw material in the base material layer, mixing uniformly, and cold mixing;

[0087] S2, conveying to a double-screw extruder for plasticizing extrusion to obtain a stone-plastic base material;

[0088] S3, using a five-roller laminating device, placing the stone-plastic base material between the first roller and the second roller to obtain a base material layer; laminating the color film layer and the wear-resistant layer on the third roller; and performing calendering on the fourth roller and the fifth roller to composite the base material layer, the color film layer and the wear-resistant layer;

[0089] S4, coating a primer on the surface of the wear-resistant layer, curing to obtain a primer layer, coating a topcoat on the surface of the primer layer, curing to obtain a topcoat layer, and cooling to obtain a floor semi-finished product;

[0090] S5, gluing the surface of the base material layer of the floor semi-finished product, laminating a soundproof layer, cold pressing, and collecting materials;

[0091] S6, performing multi-edge sawing, milling groove size adjustment, and laser jet printing a two-dimensional code on the surface of the soundproof layer.

[0092] The temperature of the first roller and the second roller is 185 DEG C, the temperature of the third roller is 180 DEG C, and the temperature of the fourth roller and the fifth roller is 85 DEG C.

[0093] The calendering speed ratio of the first roller, the second roller, the third roller, the fourth roller and the fifth roller is 1:1.07:1.3.

[0094] The thickness of the base material layer is 3.7 mm.

[0095] The coating amount of the primer is 9 g / m2, the coating amount of the topcoat is 12 g / m2, the primer curing energy is 400 mj / cm2, and the topcoat curing energy is 800 mj / cm2.

[0096] The glue is a curing reaction type hot melt adhesive, the viscosity (120 DEG C) of the glue is 6800 mPa s, the open time is 120 s, and the product model is AD-8613L.

[0097] The amount of the gluing is 75 g / m2.

[0098] The pressure of the cold pressing is 10 MPa, the temperature of the cold pressing is 28 DEG C, and the time of the cold pressing is 5 min.

[0099] The feed speed of the inkjet two-dimensional code is 90 m / min, the marking speed is 1500 mm / s, the frequency is 85 kHz, and the laser power is 65%.

[0100] Comparative Example 1

[0101] The specific implementation is the same as that of Example 1, except that the mute layer in Comparative Example 1 is IXPE (polyethylene foam), which is purchased from Nantong Kangding New Material Co., Ltd.

[0102] Comparative Example 2

[0103] The specific implementation is the same as that of Example 1, except that the mute layer in Comparative Example 2 is EVA (ethylene-vinyl acetate copolymer), which is purchased from Zhejiang Xinhengtai New Material Co., Ltd.

[0104] Comparative Example 3

[0105] The specific implementation is the same as that of Example 1, except that the mute layer in Comparative Example 3 is PP (polypropylene), which is purchased from Nantong Kangding New Material Co., Ltd.

[0106] Comparative Example 4

[0107] The specific implementation is the same as that of Example 1, except that the mute layer in Comparative Example 4 is XPS (foamed polystyrene), which is purchased from Jiangsu Pengyang Energy-saving New Material Co., Ltd.

[0108] Comparative Example 5

[0109] The specific implementation is the same as that of Example 1, except that the glue in Comparative Example 5 is a curing reaction type hot melt adhesive, the viscosity of the glue (120°C) is 3500 mPa·s, the open time is 45 s, and the product model is SD6901.

[0110] Comparative Example 6

[0111] The specific implementation is the same as that of Example 1, except that the glue in Comparative Example 6 is a thermoplastic resin hot melt adhesive, the viscosity of the glue (120°C) is 9500 mPa·s, and the product model is YE8908.

[0112] Performance Test Method

[0113] The hard PVC floor obtained in the examples and comparative examples is subjected to performance testing, and the test data is shown in Table 1.

[0114] Residual indentation (mm): refer to ISO 24343-1 (≤0.15 mm).

[0115] Sound insulation effect: refer to ASTM E492.

[0116] Silent pad bonding effect: bake for a certain time in a high temperature environment of 50°C, test before baking, bake for 5 days, 10 days, 3 months, record whether the silent pad and PVC hard floor can be peeled off, if it can be peeled off, record the peeling time (s). Specific peeling method: cut the floor into 8 inches, fix one end of the floor 1 inch long, tear the foam pad to the position 1 inch from the floor on the other end, hang a weight of 200g on the foam pad, start timing, test the time of the pad peeling to the position of 7 inches.

[0117] The two-dimensional code recognition accuracy rate: as shown in Figure 2 and Figure 3 , 5 groups of sprayed two-dimensional codes were randomly selected for scanning code test, the scanning code success rate of example 1 was 100%, and the scanning code success rate of comparative example 1 was 0%.

[0118] Figure 1 The rheological test parameters are shown in Table 2.

[0119] In Table 1, "-" means no test.

[0120] Performance test data

[0121] Table 1

[0122]

[0123] Table 2

[0124]

Claims

1. A recyclable rigid PVC flooring, characterized in that, The rigid PVC flooring comprises six layers, from bottom to top: a sound-absorbing layer, a substrate layer, a color film layer, a wear-resistant layer, a primer layer, and a topcoat layer; the thickness of the sound-absorbing layer is 1.0-5.0 mm, the thickness of the color film layer is 0.03-0.1 mm, and the thickness of the wear-resistant layer is 0.1-0.8 mm. The raw materials of the substrate layer, by weight, include: 90-120 parts PVC resin, 6-10 parts stabilizer, 0.6-2 parts external lubricant, 0.8-1.2 parts internal lubricant, 100-250 parts grinding powder, 0.3-0.5 parts colorant, 2-8 parts CPE, 2-8 parts impact modifier, and 100-400 parts stone powder; the weight ratio of external lubricant, internal lubricant, and CPE is (0.5-1):(0.5-1):(5-7); the preparation method of the recyclable rigid PVC flooring includes the following steps: S1, weighing the corresponding weight parts of each raw material in the substrate layer, mixing them evenly, and then cold mixing; S2, conveying them to a twin-screw extruder for plasticizing extrusion to obtain a stone-plastic substrate; S3, using a five-roller extruder... The process involves several steps: S1) placing the stone-plastic substrate between rollers one and two to form the substrate layer; S2) laminating the color film layer and wear-resistant layer on roller three; S3) calendering rollers four and five to composite the substrate layer, color film layer, and wear-resistant layer; S4) applying a primer to the wear-resistant layer surface, curing it to obtain a base coat layer, applying a topcoat to the primer layer surface, curing it to obtain a topcoat layer, and then cooling it to obtain a semi-finished flooring product; S5) applying adhesive to the substrate layer surface of the semi-finished flooring product, laminating the sound-absorbing layer, cold pressing it, and collecting the material; S6) performing multi-sided sawing, milling grooves, and laser printing a QR code on the surface of the sound-absorbing layer to obtain the finished product; the cold pressing pressure is 7~13MPa, and the cold pressing temperature is 25-35℃; the adhesive includes a curing reactive hot melt adhesive, and the amount of adhesive applied is 60~90g / m³. 2 The viscosity of the adhesive is 6000-9000 mPa•s, and the open time is 90-150 s.

2. The recyclable rigid PVC flooring according to claim 1, characterized in that, The temperature of the first, second, and third rolls is 180~190℃, and the temperature of the fourth and fifth rolls is 70~100℃. The rolling speed is 1. 5 m / min.

3. The recyclable rigid PVC flooring according to claim 1, characterized in that, The primer coating amount is 7~12g / m². 2 The topcoat application rate is 10~15g / m². 2 The primer curing energy is 350-600 mJ / cm. 2 The curing energy of the topcoat is 700-900 mJ / cm. 2 .

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