Mildew-proof PVC coiled floor and its preparation method

Abstract

The application discloses a mildew-proof PVC coiled floor and a preparation method thereof, and belongs to the technical field of building materials. The floor comprises, from top to bottom, a UV layer, a PVC wear-resistant layer, a PVC printing layer, a flocculent glass fiber layer, a PVC base layer, a glue layer and a PVC foaming layer, wherein the PVC base layer and the PVC foaming layer both contain mildew-proof and antibacterial master batches. The mildew-proof and antibacterial master batch contains a composite mildew-proof and antibacterial agent with sodium-based montmorillonite as a carrier, and the composite mildew-proof and antibacterial agent is constructed into a triple fixation system through intercalation fixation of quaternary ammonium salt cation monomers, secondary anchoring of methacrylated cardanol and in-situ crosslinking network locking. The UV layer contains inorganic fillers to form a surface micro-rough structure. The floor has the advantages of long-acting mildew-proof and antibacterial properties, low migration, water washing resistance, slip resistance, easy cleaning and strong interlayer bonding force, and is suitable for high-humidity and sanitary places such as hospitals and bathrooms.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a mildew-resistant PVC roll floor and its preparation method. Background Technology

[0002] Shower rooms and toilets in residences, hospital wards, nursing homes, hotels, and other similar locations are constantly exposed to complex environments characterized by high humidity, stagnant water, detergent residue, and human sebum. In addition to being wear-resistant, waterproof, and chemically resistant, flooring materials must also possess high slip resistance, ease of maintenance and cleaning, and long-term antibacterial and anti-mildew properties. Furthermore, damp areas have a significant need for foot comfort and cushioning, making roll flooring advantageous due to its ability to be installed in large, seamless areas, reducing the risk of dirt accumulation in seams.

[0003] Existing solutions for PVC flooring mainly focus on interlayer lamination, simulated textures, embossed anti-slip or flame-retardant structures. However, these solutions often have the following shortcomings in actual working conditions in humid areas: First, although some solutions propose adding antifungal agents and antibacterial agents, the composition and fixation methods are unclear. Common small-molecule antifungal agents are prone to migration and precipitation, are easily washed away by water, have a short shelf life, and may cause odor, irritation, or environmental burden. Second, rough textures or particle reinforcement are often used to improve anti-slip properties, but this easily leads to the contradiction of "difficulty in balancing anti-slip and easy cleaning." The surface microstructure is prone to dirt accumulation and difficult to clean. Third, if the joints and interlayer interfaces of multi-layer structures are not adequately controlled in humid areas, conditions for microbial growth can easily form, affecting durability and hygiene safety.

[0004] Therefore, existing technologies still struggle to simultaneously achieve the long-term anti-mold and antibacterial effects of PVC roll flooring in high-humidity environments, low migration and loss of active components, surface anti-slip and easy-to-clean properties, and the processing stability and interlayer bonding stability of multi-layer structures. To address this, it is necessary to provide an anti-mold PVC roll flooring and its preparation method. By fixing and locking the carrier of the anti-mold and antibacterial components into a network, and combining this with a multi-layer PVC roll flooring structural design, the anti-mold and antibacterial properties of the material can be improved under wet wiping, water immersion, and long-term use conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a mildew-resistant PVC roll floor and its preparation method, which solves the problems of easy mold growth, short-lasting antibacterial effect, and difficulty in achieving both anti-slip and easy-to-clean properties in the prior art under humid conditions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a mildew-resistant PVC roll flooring, comprising, from top to bottom, a UV layer, a PVC wear-resistant layer, a PVC printed layer, a flocculent fiberglass layer, a PVC base layer, an adhesive layer, and a PVC foam layer; wherein, the PVC base layer and the PVC foam layer both contain mildew-resistant and antibacterial masterbatch, the UV layer is an anti-slip and easy-to-clean coating, and the UV layer includes a UV-curable resin, a photoinitiator, and an inorganic filler, wherein the inorganic filler forms a micro-rough structure on the surface of the UV layer.

[0008] In the above process, the antifungal and antibacterial masterbatch contains a composite antifungal and antibacterial agent. This composite agent uses sodium montmorillonite as a carrier, with quaternary ammonium salt cationic monomers intercalated and fixed between the sodium montmorillonite layers. Methacryloxycatechol is anchored between the sodium montmorillonite layers and / or on the surface. Furthermore, the quaternary ammonium salt cationic monomers and the methacryloxycatechol form a cross-linked organic network between the sodium montmorillonite layers and / or on the surface under the action of an initiator. This composite fixation method—interlayer intercalation fixation, secondary anchoring on the surface / interlayer, and in-situ cross-linking locking—is beneficial for improving the retention rate of active components in the PVC system.

[0009] In the above process, the quaternary ammonium salt cationic monomer is a quaternary ammonium salt cationic monomer containing unsaturated bonds, obtained by reacting N,N-dimethyldecylamine with allyl bromide. The reactive quaternary ammonium salt cationic monomer can be inserted into the interlayer of sodium-based montmorillonite through ion exchange, and can further participate in subsequent network fixation processes, thereby helping to reduce migration and loss.

[0010] Preferably, the amount of the quaternary ammonium salt cationic monomer added relative to sodium montmorillonite is 30% to 45% of the mass of sodium montmorillonite.

[0011] Through the above technical solutions, when the amount of quaternary ammonium salt cationic monomer added relative to sodium montmorillonite is less than 30%, the interlayer active component loading is insufficient, and the initial and durable antifungal and antibacterial effects decrease; when it is higher than 45%, the proportion of organic phase in the system is too high, which easily leads to poor dispersion stability, processing stability and product appearance.

[0012] Preferably, the mass fraction of the composite antifungal and antibacterial agent in the antifungal and antibacterial masterbatch is 15% to 35%. When the mass fraction of the composite antifungal and antibacterial agent is less than 15%, the effective component of the masterbatch is too low, making it difficult to meet the continuous antifungal and antibacterial needs of the base layer and the foaming layer; when it is higher than 35%, it is easy to cause a decrease in the dispersibility of the masterbatch, calendering fluctuations, poor foaming uniformity, or product appearance defects.

[0013] Preferably, the anti-mildew and antibacterial masterbatch is disposed in the PVC base layer and the PVC foam layer, and the PVC foam layer is bonded to the side of the PVC base layer away from the flocculent fiberglass layer by an adhesive layer.

[0014] Through the above technical solutions, this arrangement method helps to form a more stable bulk distribution of anti-mold and antibacterial components in the thickness direction, thereby improving the anti-mold stability of the back side and interlayer areas.

[0015] Preferably, the inorganic filler in the UV layer is selected from one or more of ceramic powder, alumina, calcium carbonate and silica powder; the alumina has a particle size of 5~12μm, the silica powder has a particle size of 1~4μm, the ceramic powder has a particle size of 3~20μm, and the calcium carbonate has a particle size of 0.5~6μm.

[0016] By limiting the types and particle sizes of inorganic fillers on the surface, the surface anti-slip properties, cleaning resistance, and coating appearance can be balanced using the above technical solutions.

[0017] Preferably, the UV layer has a thickness of 12~28μm; the PVC wear-resistant layer has a thickness of 0.45~0.80mm; the PVC printing layer has a thickness of 0.12~0.25mm; the flocculent glass fiber layer has a thickness of 0.08~0.13mm and a surface density of 40~150g / m³. 2 The thickness of the PVC base layer is 1.10~2.70mm; the thickness of the PVC foam layer is 0.60~2.60mm; and the total thickness of the mildew-resistant PVC roll flooring is 2.40~6.50mm.

[0018] This invention also provides a method for preparing mildew-resistant PVC roll flooring, comprising the following steps:

[0019] Step (1) Add 100g of PVC resin, 10~40g of anti-mildew and antibacterial masterbatch, 10~60g of inorganic filler, 1~6g of calcium-zinc composite stabilizer, 5~25g of plasticizer, 0.2~1.5g of lubricant, and 1~10g of processing aid to a high-speed mixer for hot mixing, and then cold mixing to obtain a dry mixture; calender the dry mixture, cool and shape it, and then roll it up to obtain a PVC base sheet.

[0020] Step (2) Stir and disperse 100g of PVC paste resin, 35~80g of plasticizer, 0.5~4g of calcium-zinc composite stabilizer, 1~2g of rheology modifier, 1~20g of filler and 1~6g of pigment to prepare a plastic sol; coat the plastic sol and gel it, then print it and perform a second heat treatment to obtain a PVC printed layer.

[0021] Step (3) Mix 100g of PVC resin, 1~6g of calcium-zinc composite stabilizer, 2~15g of plasticizer, 0.2~1.2g of lubricant, and 10~20g of transparent filler, then calender and cool to set and roll up to obtain PVC wear-resistant sheet.

[0022] Step (4) Preheat the flocculent fiberglass layer; stack the PVC base sheet, flocculent fiberglass layer, PVC printing layer and PVC wear-resistant layer sheet in the order from bottom to top, then hot press and cool to shape and roll up to obtain the main body of the roll material.

[0023] Step (5) Mix 100g of PVC paste resin, 0.5~10g of anti-mildew and antibacterial masterbatch, 5~40g of inorganic filler, 1~6g of calcium-zinc composite stabilizer, 10~35g of plasticizer, 0.2~1.5g of lubricant, 0.5~6g of foaming agent, 0.2~3g of foaming aid, and 0~3g of cell stabilizer to form a PVC sol slurry. Then coat it onto release paper or release base fabric, put it into an oven and heat it at high temperature to cause the foaming agent to react and release gas, and form a PVC foam layer. Finally, cool, shape and roll it up to obtain a PVC foam layer sheet.

[0024] Step (6) The roll body obtained in step (4) and the PVC foam layer sheet obtained in step (5) are bonded together by adhesive to obtain a semi-finished roll.

[0025] Step (7) Apply UV-curable coating to the surface of the semi-finished roll material and perform UV curing to obtain mildew-resistant PVC roll flooring.

[0026] Preferably, in step (1), the hot mixing temperature is 90~115℃, the hot mixing time is 4~15min, and the cold mixing temperature is reduced to 30~55℃; in step (4), the preheating temperature of the flocculent glass fiber layer is 50~90℃, the hot pressing composite temperature is 165~185℃, and the composite pressure is 2~4MPa; in step (5), the oven heating temperature is 175~215℃, and the heating time is 30~180s; in step (6), the PVC foam layer sheet is bonded to the side of the PVC base layer in the roll body away from the flocculent glass fiber layer; the adhesive is a water-based acrylic adhesive, and the solid content of the adhesive is 35%~60%; the single-sided coating amount is 15~60g / m 2 The bonding temperature is 40~85℃, the composite pressure is 0.2~0.8MPa, and the curing time after bonding is 12~48h; the UV curing energy in step (7) is 200~1200mJ / cm. 2 The lamp power is 80~160W / cm, and the linear velocity is 10~25m / min.

[0027] Preferably, the method for preparing the antifungal and antibacterial masterbatch includes the following steps:

[0028] Step S1: Mix 100g of PVC resin, 30-60g of composite anti-mildew and antibacterial agent, 5-40g of inorganic filler, 1-8g of stabilizer, 5-30g of plasticizer, 0.2-2g of lubricant, and 2-10g of processing aid, and then perform hot mixing. Control the hot mixing temperature at 90-115℃ and the hot mixing time at 4-15min. Then, perform cold mixing to cool down to 30-55℃ to obtain dry masterbatch mixture.

[0029] Step S2: The dry mixture of masterbatch is granulated by twin-screw extrusion to obtain anti-mildew and antibacterial masterbatch. The temperature of each extrusion zone is controlled at 135-185℃ and the screw speed is 100-320rpm. The granulation method is underwater pelletizing. After cooling and drying, the anti-mildew and antibacterial masterbatch is obtained.

[0030] Preferably, in step S1, the inorganic filler is composed of calcium carbonate and talc in a mass ratio of 2:1; the plasticizer is DOTP; the lubricant is composed of polyethylene wax and stearate in a mass ratio of 1:1; and the mass fraction of the composite antifungal and antibacterial agent in the antifungal and antibacterial masterbatch is 15-35%.

[0031] Preferably, the preparation method of the composite antifungal and antibacterial agent includes the following steps:

[0032] Step P1: Add sodium-based montmorillonite to deionized water, disperse at high speed for 10-60 min at 20-40℃, and then stir at 60-80℃ for 1-4 h to allow it to swell and peel off, obtaining a montmorillonite dispersion with a mass fraction of 2-8%. Then, raise the temperature to 65-85℃ and add the cationic monomer solution dropwise to the montmorillonite dispersion over 15-90 min at a stirring speed of 300-900 rpm. Adjust the pH of the system to 4.5-7.0 with glacial acetic acid and keep the reaction at this temperature for 2-8 h. Filter and wash until the halide ions in the filtrate decrease significantly and the conductivity tends to stabilize. Place the filter cake in a vacuum dryer at 55-65℃ for 10-14 h, pulverize it through a 100-mesh sieve, and obtain the organic intercalated montmorillonite composite powder.

[0033] In the above process, quaternary ammonium salt cations are introduced into the interlayer of montmorillonite through the principle of cation exchange intercalation, which increases the interlayer spacing and endows montmorillonite with organic characteristics, thereby providing a confined reaction space and anchoring points for subsequent secondary fixation and in-situ network construction.

[0034] Step P2: Disperse the organic intercalated montmorillonite composite powder in a mixed solvent of ethanol and water at a mass ratio of 7:3 at a dispersion temperature of 25-55℃ for 10-60 min. Then, add methacrylamide cashew phenol solution dropwise over 10-60 min. After the addition is complete, adjust the pH of the system to 7.5-9.5 with Tris buffer and stir at 35-55℃ for 0.5-4 h.

[0035] In the above process, through hydrogen bonding and hydrophobic association confined adsorption, methacrylamide cashew phenol is anchored twice on the surface and between layers of montmorillonite, which enhances the hydrophobicity of the system and improves the fixation degree of the active component.

[0036] Step P3: Add initiator solution to the system obtained in step P2, heat to 60-80℃ and react for 2-6 hours under inert gas protection, filter, wash with ethanol 1-3 times, wash with deionized water 1-2 times, vacuum dry to constant weight and pulverize to obtain composite antifungal and antibacterial agent.

[0037] In the above process, through the coupling principle of free radical polymerization crosslinking and methacrylamide cashew nut shell oxidation, the unsaturated bonds of the intercalated quaternary ammonium salt cationic monomer and the unsaturated structure of the methacrylamide cashew nut shell side chain undergo in-situ polymerization crosslinking, forming a crosslinked organic network in the interlayer and surface of montmorillonite. This transforms the active component from a free state to a carrier-fixed and network-locked state, significantly reducing migration and water washing loss.

[0038] Preferably, in step P1, the amount of quaternary ammonium salt cationic monomer added relative to sodium montmorillonite is 30-45% of the mass of sodium montmorillonite; the washing preferably continues until the filtrate is basically free of obvious precipitate of halide ions when tested with silver nitrate solution, and the change in conductivity of the filtrate does not exceed 10% in two consecutive measurements.

[0039] Preferably, in step P2, 24g of methacrylamide cashew nut powder is dissolved in 120g of anhydrous ethanol to form a methacrylamide cashew nut powder solution.

[0040] Preferably, in step P3, the initiator solution is obtained by dissolving 4.8g of ammonium persulfate (APS) in 40g of deionized water.

[0041] Preferably, the method for preparing the cationic monomer solution includes the following steps:

[0042] Step A1: N,N-dimethyldecylamine and an organic solvent are added to a reactor and stirred to dissolve. The organic solvent is preferably one or a combination of acetonitrile, ethanol, or similar substances. Then, allyl bromide is added dropwise over 0.5–2 hours, with the system temperature controlled to not exceed 75°C during the addition. After the addition is complete, the reaction is maintained at 60–80°C for 2–6 hours to obtain a reaction solution containing a quaternary ammonium salt cationic monomer. The reaction solution can be used directly for subsequent solution preparation after removing some or all of the solvent under reduced pressure, or it can be further washed 1–3 times with a hydrocarbon solvent and then vacuum dried at 40–70°C for 3–12 hours to obtain the quaternary ammonium salt cationic monomer.

[0043] Step A2: Prepare a cationic monomer solution by mixing the quaternary ammonium salt cationic monomer obtained in step A1, or by concentrating the reaction solution obtained in step A1 with deionized water and ethanol.

[0044] Preferably, in step A2, the mass ratio of deionized water to ethanol is 25:8, and the mass fraction of the quaternary ammonium salt cationic monomer in the cationic monomer solution is 5-25%.

[0045] Through the above steps, a cationic monomer solution suitable for sodium-based montmorillonite intercalation reaction can be obtained.

[0046] Preferably, the method for preparing the methacrylamide cashew nut shell includes the following steps:

[0047] Under nitrogen protection, 25-35 g of high-purity cashew nut shell powder, 16-21 g of methacrylic anhydride, 0.2-0.4 g of 4-dimethylaminopyridine, and 0.04-0.06 g of p-hydroxyanisole were added to a reactor and reacted at 45-50 °C for 20 h. After the reaction, the mixture was diluted with dichloromethane and washed successively with saturated sodium bicarbonate solution, dilute hydrochloric acid, and deionized water until neutral. The solution was then dried over anhydrous magnesium sulfate, filtered, and subjected to reduced pressure to remove the solvent, yielding an orange-red transparent liquid, namely methacrylamide cashew nut shell powder.

[0048] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0049] 1. This invention constructs a long-lasting anti-mold and antibacterial immobilization system for humid conditions, and introduces this system into the PVC base layer and PVC foam layer in the form of anti-mold and antibacterial masterbatch. Mechanistically, this overcomes the problems of easy migration and precipitation, easy washing away, short shelf life, and potential odor and environmental burden of existing small-molecule anti-mold agents. Specifically, this invention uses a Na-MMT layered carrier to provide confined space and exchangeable sites. First, cation exchange intercalation is performed through reactive quaternary ammonium salt cationic monomers to achieve intercalation and immobilization of the active components, transforming them from an easily soluble free state to an interlayer confined state and significantly reducing the dissolution driving force in the aqueous phase. Second, methacryloxycatechol is introduced to perform secondary anchoring on the montmorillonite surface and between layers, utilizing hydrogen bonding and hydrophobic association to enhance the hydrophobicity and adsorption strength of the carrier surface, thereby inhibiting desorption and elution under high humidity conditions.

[0050] 2. This invention, under the action of an initiator, enables the intercalated monomers and methacryloxycatechol to undergo in-situ polymerization and cross-linking to form a cross-linked organic network, achieving network locking. This transforms the reversible fixation of active components, primarily through physical adsorption, into a stable immobilized state where carrier fixation and network locking coexist. This creates a multi-layered, irreplaceable fixation mechanism involving intercalation fixation, secondary anchoring, and in-situ cross-linked network construction, significantly reducing loss due to migration, precipitation, and repeated washing. Simultaneously, the montmorillonite layered framework and the cross-linked network synergistically construct a tortuous diffusion path and adsorption confinement effect, not only delaying the migration and consumption of active components to the material surface but also reducing the risk of microbial growth in the pore microenvironment and interlayer interfaces, giving the flooring continuous antibacterial and antifungal capabilities throughout its thickness. Furthermore, through the pre-dispersion of the masterbatch carrier and the enhanced shear dispersion of the twin-screw melt mixing, the composite antifungal and antibacterial agent can achieve a measurable and controllable uniform distribution in the PVC system and be stably fixed in the base layer and foam skeleton, avoiding local failure and batch fluctuations caused by powder agglomeration. At the same time, it can reduce the risk of loss due to migration of active components and repeated washing, and improve the stability of long-term service in humid environments.

[0051] 3. This invention constructs an anti-slip and easy-to-clean coating system on the surface UV layer. The UV-curable resin forms a dense cross-linked film under the action of a photoinitiator. At the same time, the inorganic filler is selected from one or more of ceramic powder, alumina, calcium carbonate, and silica powder, and the particle size is matched in the range of 0.5-20μm. This makes the coating surface form a stable micro-rough structure to provide wet friction and anti-slip ability. The cross-linked dense film can also reduce the penetration and adhesion of stains, improve stain resistance and easy cleaning, so as to achieve both anti-slip and easy cleaning in wet areas, and reduce the risk of secondary growth caused by detergent residue and sebum.

[0052] 4. This invention employs a multi-layered structure from top to bottom, consisting of a UV layer, a PVC wear-resistant layer, a PVC plastisol printing layer, a flocculent fiberglass layer, a PVC base layer, and a PVC foam layer. The flocculent fiberglass layer provides dimensional constraints and an anti-deformation framework; the PVC foam layer provides elastic cushioning and foot comfort; the PVC base layer provides load-bearing capacity and structural strength; and the wear-resistant and UV layers provide wear resistance and surface protection. Through interfacial melting and interdiffusion and mechanical interlocking under hot-pressing composite conditions, strong interlayer bonding, high peel strength, and resistance to delamination in hot and humid environments are achieved, improving the reliability for long-term service in humid environments. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a front view of the anti-mildew PVC roll flooring of the present invention;

[0055] Figure 2 This is a picture of the back of the anti-mildew PVC roll flooring of this invention;

[0056] Figure 3 This is a schematic cross-sectional view of the layered structure of the anti-mildew PVC roll flooring of the present invention. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] Example 1

[0059] Preparation of cationic monomer solution: 31.4 g N,N-dimethyldecylamine, 24.2 g allyl bromide and 60.0 g acetonitrile were added to a reaction flask and stirred at 55 °C for 6.0 h. After removing some acetonitrile under reduced pressure, 40.0 g anhydrous ethanol and 20.0 g deionized water were added to obtain cationic monomer solution.

[0060] Preparation of methacrylamide cashew phenol: 30.0 g cashew phenol, 18.5 g methacrylic anhydride, 0.30 g 4-dimethylaminopyridine and 0.05 g p-hydroxyanisole were added to a reactor and reacted at 48 °C for 20 h under nitrogen protection. After post-treatment, 31.6 g of methacrylamide cashew phenol was obtained.

[0061] Preparation of a composite antifungal and antibacterial agent: 50.0 g of sodium montmorillonite was added to 1500 g of deionized water and dispersed at high speed at 30 °C for 30 min, followed by swelling and exfoliation at 70 °C for 2 h. A cationic monomer solution containing 18.0 g of cationic monomer was added dropwise to the dispersion system, so that the amount of quaternary ammonium salt cationic monomer added relative to sodium montmorillonite was 36.0%. The pH of the system was adjusted to 5.6 with glacial acetic acid and the reaction was maintained at 70 °C for 4.0 h. Then, 12.0 g of methacryloxycatechol was added, and the pH of the system was adjusted to 8.5 with Tris buffer. The reaction was continued at 45 °C for 2.0 h. Then, 0.70 g of ammonium persulfate was added, and the reaction was carried out at 70 °C for 3.0 h under nitrogen protection. After filtration, washing and drying, the composite antifungal and antibacterial agent was obtained.

[0062] Preparation of antifungal and antibacterial masterbatch: Based on a total mass of 100g, 45.0g of PVC resin, 25.0g of composite antifungal and antibacterial agent, 15.0g of calcium carbonate, 2.8g of calcium-zinc composite stabilizer, 10.5g of DOTP, 0.7g of lubricant, and 1.0g of processing aid were hot-mixed, cold-mixed, and granulated by twin-screw extrusion to obtain the antifungal and antibacterial masterbatch. The composite antifungal and antibacterial agent accounted for 25.0% of the masterbatch by mass. The twin-screw extrusion granulation temperature was controlled at 150℃, and the screw speed was 200rpm.

[0063] The preparation method of mildew-resistant PVC roll flooring includes the following steps:

[0064] Step (1) Add 100.0g of PVC resin, 25.0g of anti-mildew and antibacterial masterbatch, 35.0g of inorganic filler, 3.0g of calcium-zinc composite stabilizer, 15.0g of plasticizer, 0.8g of lubricant and 4.0g of processing aid to a high-speed mixer, hot mix at 102℃ for 8min, then cold mix to 42℃ to obtain dry mix; calender the dry mix and cool and shape it to obtain a PVC base sheet with a thickness of 1.80mm.

[0065] Step (2) Stir and disperse 100.0g PVC paste resin, 52.0g plasticizer, 2.0g calcium zinc composite stabilizer, 1.5g rheology modifier, 8.0g filler and 3.0g pigment to obtain plasticized sol; coat, gel, print and heat treat a second time to obtain a PVC printed layer with a thickness of 0.16mm.

[0066] Step (3) Mix 100.0g PVC resin, 2.5g calcium zinc composite stabilizer, 8.0g plasticizer, 0.5g lubricant and 15.0g transparent filler, plasticize and calender, cool and shape and roll up to obtain a PVC wear-resistant layer sheet with a thickness of 0.60mm.

[0067] Step (4) A material with a thickness of 0.10 mm and a surface density of 80 g / m³ is prepared. 2 The flocculent fiberglass layer is preheated to 72°C and then stacked with the PVC base sheet, PVC printing layer and PVC wear-resistant layer sheet in a bottom-up order. The layers are then hot-pressed at 176°C and 2.8MPa, cooled, shaped and wound up to obtain the main body of the roll material.

[0068] Step (5) Mix 100.0g of PVC paste resin, 4.0g of anti-mildew and antibacterial masterbatch, 18.0g of inorganic filler, 2.0g of calcium-zinc composite stabilizer, 22.0g of plasticizer, 0.5g of lubricant, 2.8g of foaming agent, 1.2g of foaming aid and 1.0g of cell stabilizer to form a PVC sol slurry, coat it on the release base fabric, heat it in an oven at 196℃ for 78s, foam it, cool and set it, and then roll it up to obtain a PVC foamed layer sheet with a thickness of 1.30mm.

[0069] Step (6) uses water-based acrylic adhesive to laminate the PVC foam layer sheet onto the side of the PVC base layer away from the flocculent glass fiber layer in the roll body to obtain a semi-finished roll.

[0070] Step (7) Mix 100.0g of UV-curable resin, 3.0g of photoinitiator, 6.0g of alumina with an average particle size of 7μm and 4.0g of silica powder with an average particle size of 2μm evenly, and coat the mixture onto the surface of the semi-finished roll material. Then, cure the mixture at a UV curing energy of 620mJ / cm². 2 Curing is performed under conditions of 120W / cm lamp power and 18m / min linear velocity to form a UV layer with a thickness of 18μm, resulting in mildew-resistant PVC roll flooring with a total thickness of approximately 3.98mm.

[0071] Example 2

[0072] Preparation of cationic monomer solution: 31.4 g N,N-dimethyldecylamine, 24.2 g allyl bromide and 60.0 g acetonitrile were added to a reaction flask and stirred at 54 °C for 6.0 h. After removing some acetonitrile under reduced pressure, 42.0 g anhydrous ethanol and 18.0 g deionized water were added to obtain cationic monomer solution.

[0073] Preparation of methacrylamide cashew phenol: 28.0 g cashew phenol, 17.4 g methacrylic anhydride, 0.28 g 4-dimethylaminopyridine and 0.05 g p-hydroxyanisole were reacted at 47 °C for 18 h under nitrogen protection. After post-treatment, 29.3 g of methacrylamide cashew phenol was obtained.

[0074] Preparation of a composite antifungal and antibacterial agent: 50.0g of sodium montmorillonite was dispersed and swollen in 1500g of deionized water and then peeled off. A cationic monomer solution containing 17.5g of cationic monomer was added dropwise, so that the amount of quaternary ammonium salt cationic monomer added relative to sodium montmorillonite was 35.0%. The mixture was kept at 69℃ for 4.0h at pH 5.5. Then, 11.0g of methacrylamide cashew nut shell powder was added, the pH was adjusted to 8.4, and the mixture was stirred at 45℃ for 2.0h. Finally, 0.65g of ammonium persulfate was added, and the mixture was reacted at 70℃ for 3.0h to obtain the composite antifungal and antibacterial agent.

[0075] Preparation of antifungal and antibacterial masterbatch: Based on a total mass of 100g, 52.0g of PVC resin, 20.0g of composite antifungal and antibacterial agent, 15.5g of calcium carbonate, 2.7g of calcium-zinc composite stabilizer, 8.8g of DOTP, 0.6g of lubricant, and 0.4g of processing aid were mixed, extruded, and granulated to obtain the antifungal and antibacterial masterbatch. The composite antifungal and antibacterial agent accounted for 20.0% of the masterbatch by mass. The twin-screw extrusion granulation temperature was controlled at 150℃, and the screw speed was 200rpm.

[0076] The preparation method of mildew-resistant PVC roll flooring includes the following steps:

[0077] Step (1) Preparation of PVC base sheet: 100.0g PVC resin, 20.0g anti-mildew and antibacterial masterbatch, 32.0g inorganic filler, 2.8g calcium-zinc composite stabilizer, 13.0g plasticizer, 0.7g lubricant and 3.5g processing aid are hot-mixed, cold-mixed and then calendered to obtain a PVC base sheet with a thickness of 1.65mm.

[0078] Step (2) 100.0g PVC paste resin, 48.0g plasticizer, 1.8g calcium zinc composite stabilizer, 1.3g rheology modifier, 7.0g filler and 2.5g pigment are made into a plastic sol, which is then coated, gelled, printed and subjected to secondary heat treatment to obtain a PVC printing layer with a thickness of 0.15mm.

[0079] Step (3) Plasticize and calender 100.0g of PVC resin, 2.2g of calcium-zinc composite stabilizer, 7.0g of plasticizer, 0.4g of lubricant and 14.0g of transparent filler to obtain a PVC wear-resistant layer sheet with a thickness of 0.55mm.

[0080] Step (4) A material with a thickness of 0.09 mm and a surface density of 70 g / m³ is prepared. 2 The flocculent fiberglass layer is preheated to 68°C and then laminated with the PVC base sheet, PVC printing layer and PVC wear-resistant layer sheet. The laminate is then hot-pressed at 174°C and 2.6MPa to obtain the roll body.

[0081] Step (5) Mix 100.0g of PVC paste resin, 3.0g of anti-mildew and antibacterial masterbatch, 16.0g of inorganic filler, 1.8g of calcium-zinc composite stabilizer, 20.0g of plasticizer, 0.5g of lubricant, 2.5g of foaming agent, 1.0g of foaming aid and 0.8g of cell stabilizer to form a PVC sol slurry, coat it and heat it at 192℃ for 74s to obtain a PVC foam layer sheet with a thickness of 1.15mm.

[0082] Step (6) Use water-based acrylic adhesive to attach the PVC foam layer sheet to the back of the roll body to obtain a semi-finished roll.

[0083] Step (7) Mix 100.0g of UV-curable resin, 3.0g of photoinitiator, 5.0g of alumina with an average particle size of 7μm and 3.5g of silica powder with an average particle size of 2μm, and coat the mixture. Then, apply the mixture to a UV curing environment with an energy of 580mJ / cm². 2 Curing was performed under conditions of 110W / cm lamp power and 19m / min linear velocity to form a UV layer with a thickness of 16μm, resulting in mildew-resistant PVC roll flooring with a total thickness of approximately 3.60mm.

[0084] Example 3

[0085] Preparation of cationic monomer solution: 31.4 g N,N-dimethyldecylamine, 24.2 g allyl bromide and 60.0 g acetonitrile were added to a reaction flask and stirred at 56 °C for 6.5 h. After removing some acetonitrile under reduced pressure, 38.0 g anhydrous ethanol and 22.0 g deionized water were added to obtain cationic monomer solution.

[0086] Preparation of methacrylamide cashew phenol: 32.0 g cashew phenol, 19.8 g methacrylic anhydride, 0.32 g 4-dimethylaminopyridine and 0.05 g p-hydroxyanisole were reacted at 49 °C for 21 h under nitrogen protection. After post-treatment, 33.8 g of methacrylamide cashew phenol was obtained.

[0087] Preparation of a composite antifungal and antibacterial agent: 50.0 g of sodium montmorillonite was dispersed in 1500 g of deionized water and fully swollen and peeled. A cationic monomer solution containing 21.0 g of cationic monomer was added dropwise, so that the amount of quaternary ammonium salt cationic monomer added relative to sodium montmorillonite was 42.0%. The mixture was kept at 71 °C for 4.5 h at pH 5.7. Then, 13.0 g of methacrylamide cashew nut shell powder was added, the pH was adjusted to 8.6, and the mixture was stirred at 46 °C for 2.0 h. Finally, 0.75 g of ammonium persulfate was added, and the mixture was reacted at 71 °C for 3.0 h to obtain the composite antifungal and antibacterial agent.

[0088] Preparation of antifungal and antibacterial masterbatch: Based on a total mass of 100g, 39.0g of PVC resin, 30.0g of composite antifungal and antibacterial agent, 14.0g of calcium carbonate, 2.9g of calcium-zinc composite stabilizer, 11.0g of DOTP, 0.7g of lubricant, and 2.4g of processing aids were mixed, extruded, and granulated to obtain the antifungal and antibacterial masterbatch. The composite antifungal and antibacterial agent accounted for 30.0% of the masterbatch by mass. The twin-screw extrusion granulation temperature was controlled at 150℃, and the screw speed was 200rpm.

[0089] The preparation method of mildew-resistant PVC roll flooring includes the following steps:

[0090] Step (1) 100.0g PVC resin, 30.0g anti-mildew and antibacterial masterbatch, 38.0g inorganic filler, 3.2g calcium zinc composite stabilizer, 17.0g plasticizer, 0.9g lubricant and 4.5g processing aid are hot-mixed and cold-mixed and then calendered to obtain a PVC base sheet with a thickness of 2.00mm.

[0091] Step (2) 100.0g of PVC paste resin, 56.0g of plasticizer, 2.2g of calcium-zinc composite stabilizer, 1.6g of rheology modifier, 8.5g of filler and 3.2g of pigment are stirred and dispersed to prepare a plastic sol; the plastic sol is coated and gelled, then printed and heat-treated a second time to obtain a PVC printing layer with a thickness of 0.17mm.

[0092] Step (3) Plasticize and calender 100.0g of PVC resin, 2.8g of calcium-zinc composite stabilizer, 9.0g of plasticizer, 0.6g of lubricant and 16.0g of transparent filler to obtain a PVC wear-resistant sheet with a thickness of 0.65mm.

[0093] Step (4) A material with a thickness of 0.11 mm and a surface density of 95 g / m³ is prepared. 2 The flocculent fiberglass layer is preheated to 75°C and then laminated with the PVC base sheet, PVC printing layer and PVC wear-resistant layer sheet. The laminate is then hot-pressed at 178°C and 3.0MPa to obtain the roll body.

[0094] Step (5) Mix 100.0g of PVC paste resin, 6.0g of anti-mildew and antibacterial masterbatch, 22.0g of inorganic filler, 2.2g of calcium-zinc composite stabilizer, 24.0g of plasticizer, 0.6g of lubricant, 3.2g of foaming agent, 1.4g of foaming aid and 1.1g of cell stabilizer to form a PVC sol slurry, coat it and heat it at 198℃ for 82s to obtain a PVC foamed layer sheet with a thickness of 1.55mm.

[0095] Step (6) Use water-based acrylic adhesive to attach the PVC foam layer sheet to the back of the roll body to obtain a semi-finished roll.

[0096] Step (7) Mix 100.0g of UV-curable resin, 3.2g of photoinitiator, 7.0g of alumina with an average particle size of 8μm and 4.5g of silica powder with an average particle size of 2μm, and coat the mixture. Then, apply the mixture to a UV curing environment with an energy of 660mJ / cm². 2 Curing was performed under conditions of 125W / cm lamp power and 17m / min linear velocity to form a UV layer with a thickness of 20μm, resulting in mildew-resistant PVC roll flooring with a total thickness of approximately 4.48mm.

[0097] Comparative Example 1

[0098] Except that sodium-based montmorillonite carrier is not used when preparing the composite antifungal and antibacterial agent, and instead the cationic monomer and methacryloxycatechol of the same total amount as the active components in Example 1 are directly added to the masterbatch system, the other raw material types, ratios, sheet thicknesses, composite conditions and finished product preparation conditions are the same as in Example 1.

[0099] Comparative Example 2

[0100] Except that methacrylamide cashew phenol was not added when preparing the composite antifungal and antibacterial agent, and no subsequent cross-linking fixation was performed, the other conditions were the same as in Example 1.

[0101] Comparative Example 3

[0102] Except for adjusting the amount of quaternary ammonium salt cationic monomer relative to sodium montmorillonite to 25.0%, the other conditions were the same as in Example 1.

[0103] Comparative Example 4

[0104] Except for adjusting the amount of quaternary ammonium salt cationic monomer relative to sodium montmorillonite to 50.0%, the other conditions were the same as in Example 1.

[0105] Comparative Example 5

[0106] Except for adjusting the mass fraction of the composite antifungal and antibacterial agent in the antifungal and antibacterial masterbatch to 10.0%, the other conditions are the same as in Example 1.

[0107] Comparative Example 6

[0108] Except for adjusting the mass fraction of the composite antifungal and antibacterial agent in the antifungal and antibacterial masterbatch to 40.0%, the other conditions are the same as in Example 1.

[0109] Comparative Example 7

[0110] Except for the addition of only a PVC base layer and no PVC foam layer to the anti-mildew and antibacterial masterbatch, the other conditions were the same as in Example 1. This comparative example is used to illustrate the effect of the "double-layer setting of PVC base layer and PVC foam layer" on the overall anti-mildew and antibacterial durability.

[0111] Test methods

[0112] Each example and comparative sample was cut to the specified size and conditioned at (23±2)℃ and (50±5)% relative humidity for no less than 24h (refer to GB / T2918); unless otherwise stated, each test was performed at least 3 times in parallel and the average value was taken.

[0113] (1) Structural fixation effect (d001 layer spacing): The d001 layer spacing of the composite antifungal and antibacterial agent was determined by X-ray diffraction (XRD) and calculated according to the Bragg formula.

[0114] (2) Comprehensive evaluation of migration / extraction: The fixation and migration of active components were comprehensively evaluated using solvent extraction and surface elution methods. After solvent reflux extraction, the retention of organic components in the sample before and after extraction was measured (the content of organic components can be characterized by thermogravimetric analysis (TGA), referring to the current version of ISO 11358 or equivalent methods). The surface migration amount (mg·m³) was obtained by calculating the mass of precipitates per unit area using the surface elution-weighing method. -2 ).

[0115] (3) Mass change after water immersion: Refer to GB / T1034; after soaking the sample in deionized water at (25±1)℃ for 168h, weigh it and calculate the mass change rate (or mass loss rate).

[0116] (4) Antibacterial properties and durability: The antibacterial properties were tested in accordance with GB / T31402. The test strains were Escherichia coli and Staphylococcus aureus. The antibacterial rate was calculated after 24 hours of incubation. The antibacterial rate was retested after treatment according to the durability treatment conditions of this application, and expressed as the ratio of the retested antibacterial rate to the initial antibacterial rate.

[0117] (5) Anti-mildew performance: The anti-mildew performance is carried out in accordance with GB / T24128. The anti-mildew level is evaluated after 28 days of mixed mold spore inoculation and culture, and the front and back are rated respectively. According to the scope of this application, level 0 is the best, and the lower the level, the better the anti-mildew performance.

[0118] (6) Interlayer peel strength: The interlayer peel strength was determined according to ISO 24345, and the results are expressed in N·50mm. -1 express.

[0119] (7) Anti-slip and chemical resistance: The wet pendulum value PTV is determined according to EN16165 (pendulum method); the maximum safe angle and anti-slip grade are determined according to DIN51130 (slope method) and the R grade is given; the dry / wet dynamic friction coefficient μ is determined according to EN16165 (tribometer method) or equivalent method; the chemical resistance is evaluated according to ISO26987 and is rated from 0 to 3.

[0120] (8) Thermal stability and processing compatibility: T5% was determined according to ISO 11358; the thermal stability time of Congo red was determined according to GB / T 2917.1; the color change and overall color difference ΔE in the 180℃×30min oven were determined according to GB / T 7921 or equivalent color difference rules; and the processing compatibility was comprehensively evaluated in conjunction with the phenomena of calendering and foaming processes. The test results are shown in Tables 1-5:

[0121] Table 1 Composite Fixation and Migration Performance Data

[0122] sample d001 interlayer spacing / nm Retention rate after extraction / % Water immersion mass loss / % <![CDATA[Surface migration amount / mg·m -2 > Example 1 2.41 95.3 1.62 0.41 Example 2 2.35 94.1 1.88 0.48 Example 3 2.38 94.8 1.71 0.44 Comparative Example 1 1.30 72.4 7.54 2.26 Comparative Example 2 1.86 82.9 4.58 1.33 Comparative Example 3 1.68 86.7 3.26 0.95 Comparative Example 4 2.07 88.4 3.74 1.14 Comparative Example 5 2.32 90.6 2.41 0.71 Comparative Example 6 2.44 91.8 2.93 0.89 Comparative Example 7 2.40 94.7 1.95 0.53

[0123] Table 2 Data on anti-mildew, antibacterial, and durability performance.

[0124] sample Initial antibacterial rate of Escherichia coli / % Initial antibacterial rate of Staphylococcus aureus / % Antibacterial retention rate after wet wiping / % Antibacterial retention rate after water immersion / % Antibacterial retention rate after heat aging / % Front anti-mildew rating Back anti-mildew rating Example 1 99.92 99.90 99.36 98.82 98.55 0 0 Example 2 99.73 99.76 99.08 98.24 97.96 0 0 Example 3 99.84 99.87 99.18 98.46 98.21 0 0 Comparative Example 1 99.31 99.36 88.46 84.92 83.74 1 1 Comparative Example 2 99.27 99.34 91.94 89.52 88.31 1 1 Comparative Example 3 96.94 97.21 95.27 93.06 92.34 1 1 Comparative Example 4 99.58 99.63 96.12 94.36 93.58 1 1 Comparative Example 5 95.74 96.11 94.01 92.41 91.76 2 2 Comparative Example 6 99.79 99.82 98.43 97.66 97.08 0 0 Comparative Example 7 99.26 99.33 95.12 93.64 92.88 1 2

[0125] Table 3. Processing and Finished Product Structural Performance Data

[0126] sample Masterbatch Dispersion Evaluation Calendering stability Foaming uniformity Peel strength / N·50mm⁻¹ Dimensional change rate / % Appearance defects Example 1 excellent Stablize uniform 52.8 0.18 No obvious defects Example 2 excellent Stablize uniform 50.9 0.21 No obvious defects Example 3 excellent Stablize uniform 51.6 0.20 No obvious defects Comparative Example 1 middle Slight fluctuations Relatively uniform 44.7 0.31 Slight precipitation Comparative Example 2 middle Slight fluctuations Relatively uniform 46.0 0.29 No obvious defects Comparative Example 3 excellent Stablize uniform 49.2 0.24 No obvious defects Comparative Example 4 generally Significant fluctuations Slightly uneven 43.6 0.36 Slight graininess Comparative Example 5 excellent Stablize uniform 51.4 0.22 No obvious defects Comparative Example 6 generally Significant fluctuations Slightly collapsed bubbles 41.9 0.39 Slight particles and localized fogging Comparative Example 7 excellent Stablize uniform 50.5 0.23 No obvious defects

[0127] Table 4 Anti-slip and surface chemical resistance properties

[0128] Group Wet pendulum value PTV Maximum safe angle / ° Anti-slip rating wet dynamic friction coefficient μ Dry dynamic friction coefficient μ Chemical resistance rating (0~3) Example 1 41 17.8 R10 0.43 0.68 0 Example 2 39 16.9 R10 0.41 0.66 0 Example 3 40 17.3 R10 0.42 0.67 0 Comparative Example 1 38 16.1 R10 0.39 0.64 1 Comparative Example 2 38 16.3 R10 0.40 0.64 1 Comparative Example 3 39 16.6 R10 0.41 0.65 0 Comparative Example 4 36 14.9 R10 0.37 0.62 1 Comparative Example 5 39 16.4 R10 0.40 0.65 0 Comparative Example 6 35 14.3 R10 0.36 0.61 1 Comparative Example 7 39 16.5 R10 0.40 0.65 0

[0129] Table 5 Thermal stability and processing compatibility data

[0130] sample T5% / ℃ Congo Red Heat Stabilization Time / min 180℃×30min Overall color difference ΔE Color change rating (0~5) at 180℃ for 30 minutes Thermal stability of rolling process Thermal stability during foaming Example 1 231.8 42.6 3.5 1 Stablize Stablize Example 2 229.4 40.8 3.9 1 Stablize Stablize Example 3 230.9 41.7 3.6 1 Stablize Stablize Comparative Example 1 211.6 24.3 9.7 3 Slight fluctuations Slight fluctuations Comparative Example 2 218.7 30.9 7.3 2 Slight fluctuations Slight fluctuations Comparative Example 3 223.8 35.2 5.7 2 Stablize Stablize Comparative Example 4 220.5 29.8 8.2 3 Significant fluctuations Slightly unstable Comparative Example 5 226.1 36.1 5.3 2 Stablize Stablize Comparative Example 6 217.9 28.4 8.9 3 Significant fluctuations Slightly collapsed bubbles Comparative Example 7 227.6 38.2 4.7 1 Stablize Stablize

[0131] As can be seen from Tables 1 to 5, Examples 1 to 3 are generally superior to the comparative examples in terms of composite fixation and migration control, anti-mildew and antibacterial durability, processing and structural stability, anti-slip and chemical resistance, as well as thermal stability and processing adaptability.

[0132] Among them, Example 1 showed the best overall performance, with superior levels in terms of extraction retention rate, surface migration amount, antibacterial retention rate, peel strength, wet anti-slip performance and thermal stability.

[0133] Comparative Examples 1 and 2 show that when only free active components are used or when secondary anchoring and cross-linking fixation are lacking, the migration amount increases, durability decreases, and thermal stability deteriorates. Comparative Examples 4 and 6 show that when the amount of quaternary ammonium salt cationic monomer added is too high or the mass fraction of the composite antifungal and antibacterial agent in the masterbatch is too high, although the initial antibacterial performance is still high, processing fluctuations, surface condition, and thermal stability will be adversely affected. Comparative Example 7 shows that simultaneously setting the antifungal and antibacterial masterbatch in the PVC base layer and the PVC foam layer is more conducive to the overall balance and long-term maintenance of antifungal and antibacterial properties.

[0134] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A mildew-resistant PVC roll flooring, characterized in that, The mildew-resistant PVC roll flooring comprises, from top to bottom, a UV layer, a PVC wear-resistant layer, a PVC printed layer, a flocculent fiberglass layer, a PVC base layer, an adhesive layer, and a PVC foam layer; Both the PVC base layer and the PVC foam layer contain anti-mildew and antibacterial masterbatch, and the anti-mildew and antibacterial masterbatch contains a composite anti-mildew and antibacterial agent; The composite antifungal and antibacterial agent uses sodium montmorillonite as a carrier, with quaternary ammonium salt cationic monomers intercalated and fixed between the sodium montmorillonite layers, and methacryloxy cashew phenol anchored between and / or on the sodium montmorillonite layers. Furthermore, the quaternary ammonium salt cationic monomers and the methacryloxy cashew phenol form a cross-linked organic network between and / or on the sodium montmorillonite layers under the action of an initiator. The UV layer is an anti-slip and easy-to-clean coating. The UV layer includes a UV-curable resin, a photoinitiator, and an inorganic filler. The inorganic filler forms a micro-rough structure on the surface of the UV layer.

2. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The quaternary ammonium salt cationic monomer is a quaternary ammonium salt cationic monomer containing unsaturated bonds obtained by reacting N,N-dimethyldecylamine with allyl bromide.

3. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The amount of the quaternary ammonium salt cationic monomer added relative to sodium montmorillonite is 30% to 45% of the mass of sodium montmorillonite.

4. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The mass fraction of the compound antifungal and antibacterial agent in the antifungal and antibacterial masterbatch is 15%~35%.

5. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The anti-mildew and antibacterial masterbatch is disposed in the PVC base layer and the PVC foam layer, and the PVC foam layer is bonded to the side of the PVC base layer away from the flocculent fiberglass layer by an adhesive layer.

6. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The inorganic filler in the UV layer is selected from one or more of ceramic powder, alumina, calcium carbonate and silica powder; the particle size of the alumina is 5~12μm, the particle size of the silica powder is 1~4μm, the particle size of the ceramic powder is 3~20μm, and the particle size of the calcium carbonate is 0.5~6μm.

7. The mildew-resistant PVC roll flooring according to claim 1, characterized in that, The UV layer has a thickness of 12~28μm; the PVC wear-resistant layer has a thickness of 0.45~0.80mm; the PVC printing layer has a thickness of 0.12~0.25mm; the flocculent glass fiber layer has a thickness of 0.08~0.13mm and a surface density of 40~150g / m³. 2 The thickness of the PVC base layer is 1.10~2.70mm; the thickness of the PVC foam layer is 0.60~2.60mm; and the total thickness of the mildew-resistant PVC roll flooring is 2.40~6.50mm.

8. A method for preparing anti-mildew PVC roll flooring, characterized in that, The method for preparing the mildew-resistant PVC roll flooring according to any one of claims 1 to 7 comprises the following steps: Step (1) Add 100g of PVC resin, 10~40g of anti-mildew and antibacterial masterbatch, 10~60g of inorganic filler, 1~6g of calcium-zinc composite stabilizer, 5~25g of plasticizer, 0.2~1.5g of lubricant, and 1~10g of processing aid to a high-speed mixer for hot mixing, followed by cold mixing to obtain a dry mixture; calender the dry mixture, cool and shape it, and then roll it up to obtain a PVC base sheet; Step (2) Mix and disperse 100g of PVC paste resin, 35~80g of plasticizer, 0.5~4g of calcium-zinc composite stabilizer, 1~2g of rheology modifier, 1~20g of filler and 1~6g of pigment to prepare a plastic sol; coat the plastic sol and gel it, then print it and perform a second heat treatment to obtain a PVC printed layer; Step (3) Mix 100g of PVC resin, 1~6g of calcium-zinc composite stabilizer, 2~15g of plasticizer, 0.2~1.2g of lubricant, and 10~20g of transparent filler, then calender and cool to set and roll up to obtain PVC wear-resistant sheet material. Step (4) Preheat the flocculent fiberglass layer; stack the PVC base sheet, flocculent fiberglass layer, PVC printing layer, and PVC wear-resistant layer sheet in order from bottom to top, then hot press and cool to set and roll up to obtain the main body of the roll material; Step (5) Mix 100g of PVC paste resin, 0.5~10g of anti-mildew and antibacterial masterbatch, 5~40g of inorganic filler, 1~6g of calcium-zinc composite stabilizer, 10~35g of plasticizer, 0.2~1.5g of lubricant, 0.5~6g of foaming agent, 0.2~3g of foaming aid, and 0~3g of cell stabilizer to form a PVC sol slurry. Then coat it onto release paper or release base fabric, put it into an oven and heat it at high temperature to cause the foaming agent to react and release gas, and form a PVC foam layer. Finally, cool, shape and roll it up to obtain a PVC foam layer sheet. Step (6) The roll body obtained in step (4) and the PVC foam layer sheet obtained in step (5) are bonded together by adhesive to obtain a semi-finished roll. Step (7) Apply UV-curable coating to the surface of the semi-finished roll material and perform UV curing to obtain mildew-resistant PVC roll flooring.

9. The preparation method according to claim 8, characterized in that, In step (1), the hot mixing temperature is 90~115℃, the hot mixing time is 4~15min, and the cold mixing temperature is reduced to 30~55℃; in step (4), the preheating temperature of the flocculent glass fiber layer is 50~90℃, the hot pressing composite temperature is 165~185℃, and the composite pressure is 2~4MPa; in step (5), the oven heating temperature is 175~215℃, and the heating time is 30~180s.

10. The preparation method according to claim 8, characterized in that, In step (6), the PVC foamed layer sheet is bonded to the side of the PVC base sheet in the roll material obtained in step (4) that is away from the flocculent glass fiber layer; the adhesive is a water-based acrylic adhesive with a solid content of 35%~60%; the single-sided coating amount is 15~60g / m 2 The bonding temperature is 40~85℃, the bonding pressure is 0.2~0.8MPa, and the curing time after bonding is 12~48h. In step (7), the UV curing energy is 200~1200 mJ / cm. 2 The lamp power is 80~160W / cm, and the linear velocity is 10~25m / min.

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