A floor covering with a polyurethane elastomer surface layer and a production method thereof

Abstract

The present invention discloses a flooring material having a polyurethane elastomer surface layer, comprising a wear-resistant layer, a PVC pressure-resistant layer, a fiber stabilization layer, and a foaming layer stacked sequentially from top to bottom. The wear-resistant layer comprises a cast-laminated TPU wear-resistant surface layer and a PVC wear-resistant layer, wherein the TPU wear-resistant surface layer is a cast-laminated layer. Casting TPU on the surface of the PVC wear-resistant layer significantly improves the peel strength between the TPU layer and the PVC wear-resistant layer, compared to adhesive lamination or hot-press lamination, and reduces the use of adhesives. The flooring material has excellent elasticity, and the peel strengths between the TPU layer and the PVC wear-resistant layer, and between the PVC wear-resistant layer and the PVC pressure-resistant layer, meet the performance requirements of sports flooring materials. The present invention also discloses a method for producing a flooring material having a polyurethane elastomer surface layer.

Description

Technical Field

[0001] The present invention relates to the technical field of sports flooring, in particular to a flooring with a polyurethane elastomer surface layer and a production method thereof. Background Art

[0002] Flooring is a lightweight floor covering material with a multi-layer composite structure. Its basic structure, from top to bottom, consists of a wear-resistant layer, a pressure-resistant reinforcement layer, and an elastic foam layer. The polymer material used in both the wear-resistant and pressure-resistant reinforcement layers is often the same PVC (polyvinyl chloride). This shared base material ensures stable interlayer peeling strength in the composite structure. In this improved solution, the wear-resistant layer, or surface layer, is made of TPU (thermoplastic polyurethane).

[0003] The composite between TPU and PVC layers includes the following methods: CN111021670A discloses a method for preparing a TPU floor that is not easy to deform, wherein the wear-resistant surface layer of TPU is hot-pressed and bonded to the bottom layer of PVC; CN112312507A discloses an anti-mildew and antibacterial crawling mat, wherein the TPU film is bonded to the PVC foam layer through antibacterial glue. During hot-pressing composite, there is a difference in softening point between the two materials, and the interface peeling strength is poor; the interface peeling strength of gluing is better than that of hot-pressing composite, but there is also the problem of poor compatibility between the adhesive and TPU. During the use of sports flooring, especially in low-temperature environments, the difference in low-temperature elasticity between the TPU layer and the PVC layer increases, and the TPU layer with excellent elasticity undergoes local deformation due to the friction of the athlete's soles, and the direction of deformation is parallel to the surface of the flooring. When the interface peeling strength of the TPU and PVC composite is insufficient, the deformation of the TPU layer will accelerate its peeling from the PVC layer, and therefore cannot meet the long-term use of the sports flooring. Summary of the Invention

[0004] One of the purposes of the present invention is to overcome the defects existing in the prior art and provide a floor glue with a polyurethane elastomer surface layer, in which a TPU wear-resistant surface layer is produced by casting on the surface of a PVC wear-resistant layer, thereby improving the peel strength between the wear-resistant unit layers and between the wear-resistant layer and the pressure-resistant layer of the obtained floor glue.

[0005] In order to achieve the above technical effects, the technical solution of the present invention is: a floor glue with a polyurethane elastomer surface layer, including a wear-resistant layer, a PVC pressure-resistant layer, a fiber stabilization layer and a foaming layer stacked in sequence from the surface to the bottom, the wear-resistant layer includes a cast composite TPU wear-resistant surface layer and a PVC wear-resistant layer, and the TPU wear-resistant surface layer is a cast layer.

[0006] A preferred technical solution is that the pressure-resistant layer includes a mesh cloth layer and two layers of PVC pressure-resistant unit layers, and the mesh cloth layer is embedded between the two layers of the PVC pressure-resistant unit layers.

[0007] A second object of the present invention is to provide a method for producing a floor covering having a polyurethane elastomer surface layer, comprising the following steps:

[0008] S1: preparing a PVC wear-resistant layer, casting a TPU resin mixture on the surface of the PVC wear-resistant layer, and curing it to obtain a wear-resistant layer composed of a TPU wear-resistant surface layer and a PVC wear-resistant layer;

[0009] S2: Composite production of a pressure-resistant layer, a fiber stabilization layer, and a foaming layer on the release surface of the release paper, heat-embossing the foaming layer after foaming, and remove the release paper to obtain a composite bottom layer;

[0010] S3: heating the wear-resistant layer and the composite bottom layer, hot pressing and laminating them, and performing heat embossing on the TPU surface of the wear-resistant layer to obtain a flooring rubber having a polyurethane elastomer surface layer.

[0011] The preferred technical solution is that, by weight, the main components of the TPU resin mixture are 100 parts of thermoplastic polyurethane, 2 to 12 parts of ultraviolet absorber, 1 to 5 parts of antioxidant, 5 to 20 parts of color masterbatch, and 0.2 to 3 parts of silane coupling agent;

[0012] The raw materials of the PVC wear-resistant layer mainly include 100 parts of polyvinyl chloride paste resin, 20-50 parts of plasticizer and 0.3-3 parts of stabilizer.

[0013] The preferred technical solution is that, based on 100 parts of the added mass of the components in the thermoplastic polyurethane, the TPU resin mixture further includes 1 to 4.5 parts of carbonized diimide and 0.1 to 1.3 parts of C4 to C8 amino polyacid having primary and / or secondary amine groups.

[0014] The specific amount of carbonized diimide added to 100 parts of thermoplastic polyurethane is 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, and the data interval with any two of the above points as the maximum and minimum values; the specific amount of amino polyacid added is 0.1 part, 0.3 part, 0.5 part, 0.7 part, 0.9 part, 1.1 part, 1.3 parts, and the data interval with any two of the above points as the maximum and minimum values; further, the amount of carbonized diimide added is 1 to 2.5 parts, and the amount of amino polyacid added is 0.5 to 1 part.

[0015] A preferred technical solution is that the raw materials for the PVC wear-resistant layer further include 1.5 to 8 parts of carboxylic acid-type tertiary chloroacetic acid based on 100 parts of the components added by mass in the polyvinyl chloride paste resin. The amount of carboxylic acid-type tertiary chloroacetic acid added to 100 parts of the polyvinyl chloride paste resin is 1.5 parts, 2.5 parts, 3.5 parts, 5 parts, 6 parts, 7 parts, 8 parts, and a data range with any two of the above points as the maximum and minimum values, preferably 3 to 6 parts.

[0016] A preferred technical solution is that the amino polyacid is at least one selected from glutamic acid, aspartic acid and aminoadipic acid.

[0017] A preferred technical solution is that the silane coupling agent is an aminosilane coupling agent.

[0018] The preferred technical solution is: the TPU casting temperature in S1 is 110-130°C; the temperature of the hot-pressed composite wear-resistant layer in S3 is 80-100°C, the temperature of the composite bottom layer is 120-140°C, and the pressure is 20-30 kg. Furthermore, the TPU casting temperature in S1 is 115-125°C; the temperature of the hot-pressed composite wear-resistant layer in S3 is 87-105°C, and the temperature of the composite bottom layer is 125-135°C.

[0019] The preferred technical solution is that the temperature of the heating embossing treatment in S3 is 130-140° C. and the pressure is 20-30 kg.

[0020] The advantages and beneficial effects of the present invention are:

[0021] The wear-resistant surface layer of the flooring with a polyurethane elastomer surface layer is a TPU cast layer. By casting TPU on the surface of the PVC wear-resistant layer, the peel strength between the TPU layer and the PVC wear-resistant layer is significantly improved compared with adhesive lamination and hot pressing lamination, and the use of adhesive is reduced. The flooring surface layer has excellent elasticity, and the peel strength between the TPU layer and the PVC wear-resistant layer, and between the PVC wear-resistant layer and the PVC pressure-resistant layer, meets the performance requirements of sports flooring.

[0022] The production method of floor glue includes the steps of wear-resistant layer production, composite bottom layer production, hot pressing composite embossing and other steps. On the basis of cast composite, hot pressing composite and heated embossing are used to further improve the peeling strength between composite layers. The PVC wear-resistant layer and the PVC pressure-resistant layer have the same base material and are tightly adhered, so the floor glue has a long service life. DETAILED DESCRIPTION

[0023] The following examples are only used to illustrate the technical solution of the present invention more clearly, and are not intended to limit the scope of protection of the present invention.

[0024] Layered structure of floor coverings

[0025] The wear-resistant layer is located on the surface of the flooring and is in direct contact with the soles of shoes, providing elasticity and wear resistance to the surface. The pressure-resistant layer is a supporting layer that provides a strength foundation for the wear-resistant layer. It has higher strength and impact resistance than the wear-resistant layer and foaming layer.

[0026] The interlaced fiber braiding structure in the fiber stabilization layer can quickly disperse the local impact force of the flooring, improving the dimensional stability of the flooring and the stability of the layered structure during use;

[0027] The foam layer provides resilience and vibration absorption properties, which can effectively protect athletes, reduce sports injuries, and alleviate impacts on leg joints.

[0028] TPU resin mixture for casting

[0029] The main components of the TPU resin mixture for casting are thermoplastic polyurethane, ultraviolet absorber, antioxidant, color masterbatch, and silane coupling agent. The silane coupling agent can be a silane coupling agent that does not contain amino groups in its molecular structure or a silane coupling agent that contains amino groups.

[0030] Further aminosilane coupling agents, the selection range includes: aminopropyltriethoxysilane, aminopropyltrimethoxysilane, bis[(3-triethoxysilyl)propyl]amine, bis[(3-trimethoxysilyl)propyl]amine, 3-aminopropylmethyldiethoxysilane, 3-aminopropylmethyldimethoxysilane, aminoethylaminomethyltriethoxysilane, aminoethylaminomethylmethyldiethoxysilane, diethylenetriaminopropyltrimethoxysilane, diethylenetriaminopropyltriethoxysilane.

[0031] In order to further improve the interfacial compatibility between the TPU layer and the PVC wear-resistant layer, carbonized diimide and amino polyacid are further introduced into the TPU resin mixture. The amino polyacid can be selected from aspartic acid, glutamic acid, aminoadipic acid, iminodiacetic acid, aminopimelic acid, diaminopimelic acid, and aminosuberic acid, and more preferably aspartic acid, glutamic acid, and aminoadipic acid.

[0032] It is understood that, in addition to the TPU matrix, the colorant masterbatch also contains a dispersant to facilitate the dispersion of the colorant in the TPU throughout the masterbatch TPU matrix and the TPU material in the cast resin mixture. The addition of a silane coupling agent is common in resin mixtures containing inorganic powders such as ceramic micropowders, carbon powder, diatomaceous earth, carbon black, and titanium dioxide. Furthermore, the TPU resin mixture does not contain any inorganic components.

[0033] PVC pressure-resistant layer raw materials

[0034] The PVC pressure-resistant layer is coated onto release paper. The main components of the coating are polyvinyl chloride paste resin, plasticizer, and stabilizer. To further enhance the peel strength between the TPU layer and the PVC wear-resistant layer, the PVC pressure-resistant layer also includes carboxylic acid-type tertiary chloroacetate, in addition to the introduction of carbonized diimide and amino polyacid into the TPU resin mixture.

[0035] It is understandable that components such as color paste and masterbatch that impart a predetermined color to a single layer can be selectively added to the coating and casting materials that constitute the floor glue after lamination.

[0036] The layered structure of the floor glue of the embodiment and the comparative example includes a wear-resistant layer, a PVC pressure-resistant layer, a fiber stabilization layer and a foaming layer from the surface to the bottom; the wear-resistant layer is a TPU wear-resistant surface layer and a PVC wear-resistant layer stacked in sequence; the PVC pressure-resistant layer is a PVC pressure-resistant unit layer, a polyester fiber mesh layer and a PVC pressure-resistant unit layer stacked in sequence; the polyester fiber mesh layer (mesh 5mm*5mm, gram weight 80g per square) has a larger mesh that allows fluid-like PVC material to pass through, that is, the polyester fiber mesh layer is embedded between two layers of PVC pressure-resistant unit layers; the fiber stabilization layer is a glass fiber mesh cloth (mesh 4mm*4mm, gram weight 50g per square); the foaming layer is a PVC closed-cell foaming layer.

[0037] The specific thickness of each layer in the laminated structure of the floor glue is: wear-resistant layer 0.5mm (TPU wear-resistant surface layer and PVC wear-resistant layer 0.25mm each), pressure-resistant layer 0.65mm, and foaming layer 7mm.

[0038] 1. Raw material configuration:

[0039] 1. Example Casting of TPU resin mixture for producing TPU wear-resistant surface layer

[0040] A1: The composition of the TPU resin mixture is: 100 parts of thermoplastic polyurethane (model UT7-70AU, the same below), 3 parts of ultraviolet absorber (UV-4), 3.5 parts of antioxidant 1098, and 10 parts of color masterbatch; the color masterbatch is TPU color masterbatch. The mixture is heated to 120°C and uniformly dispersed to obtain the TPU resin mixture.

[0041] A2: The composition of the TPU resin mixture is: 100 parts of thermoplastic polyurethane, 3 parts of ultraviolet absorber, 3.5 parts of antioxidant, 10 parts of color masterbatch, and 1.5 parts of silane coupling agent A-174; the color masterbatch is TPU color masterbatch. The mixture is mixed and heated to 120°C and uniformly dispersed to obtain a TPU resin mixture.

[0042] A3: The composition of the TPU resin mixture is: 100 parts of thermoplastic polyurethane, 3 parts of ultraviolet absorber, 3.5 parts of antioxidant, 10 parts of color masterbatch, and 1.5 parts of aminosilane coupling agent KH550; the color masterbatch is TPU color masterbatch. Mix and heat to 120°C and disperse evenly to obtain a TPU resin mixture.

[0043] A4: The composition of the TPU resin mixture is: 100 parts of thermoplastic polyurethane, 3 parts of ultraviolet absorber, 3.5 parts of antioxidant, 10 parts of color masterbatch, 1.5 parts of aminosilane coupling agent KH550, 5 parts of carbonized diimide, and 1.2 parts of iminodiacetic acid; the color masterbatch is TPU color masterbatch. Mix and heat to 120°C and disperse evenly to obtain a TPU resin mixture.

[0044] A5: The composition of the TPU resin mixture is: 100 parts of thermoplastic polyurethane, 3 parts of ultraviolet absorber, 3.5 parts of antioxidant, 10 parts of color masterbatch, 1.5 parts of aminosilane coupling agent KH550, 2 parts of carbonized diimide, and 0.8 parts of aminoadipic acid; the color masterbatch is TPU color masterbatch. Mix and heat to 120°C and disperse evenly to obtain a TPU resin mixture.

[0045] Both iminodiacetic acid and aminoadipic acid are dissolved in a solvent, and the aminopolycarboxylic acid solution is added to the TPU resin mixture.

[0046] 2. Raw materials for the PVC wear-resistant layer in the embodiment

[0047] B1: The raw material composition of the PVC wear-resistant layer is 100 parts of polyvinyl chloride paste resin (model PR-1069, the same below), 40 parts of plasticizer, and 1 part of stabilizer.

[0048] B2: The raw material composition of the PVC wear-resistant layer is 100 parts of polyvinyl chloride paste resin, 40 parts of plasticizer, 1 part of stabilizer, and 5 parts of carboxyl type chloroacetic acid resin.

[0049] 3. The raw materials of the PVC pressure-resistant layer include 100 parts of polyvinyl chloride paste resin (model PR-440), 40 parts of plasticizer, 1 part of stabilizer, 15 parts of filler, and 2 parts of color paste. The raw materials of the PVC foam layer include 100 parts of polyvinyl chloride paste resin (model PR-450), 45 parts of plasticizer, 1 part of stabilizer, 5 parts of foaming agent, and 2 parts of color paste.

[0050] 2. Example 2: The method for producing a floor covering having a polyurethane elastomer surface layer comprises the following steps:

[0051] S1: Coating PVC wear-resistant layer raw materials, heating and drying at 120℃, plasticizing at 205℃, and cooling to obtain PVC wear-resistant layer;

[0052] S2: Casting a TPU resin mixture on the surface of the PVC wear-resistant layer at a casting temperature of 120°C and heating and drying at 100°C to obtain a wear-resistant layer composed of a TPU wear-resistant surface layer and a PVC wear-resistant layer;

[0053] S3: On the release surface of the release paper, a PVC pressure-resistant unit layer (drying and plasticizing), a composite polyester fiber mesh layer, a coated PVC pressure-resistant unit layer (drying and plasticizing), a composite fiber stabilization layer, and a foaming layer (heating and foaming) are sequentially prepared. After foaming, the foaming layer is subjected to heat embossing treatment, and the release paper is removed to obtain a composite bottom layer;

[0054] S4: Heat the wear-resistant layer to 90°C and the composite bottom layer to 130°C at the same time. The pressure of the composite roller is 25 kg and hot pressing is performed.

[0055] S5: The TPU surface of the wear-resistant layer is subjected to heat embossing treatment. The temperature of the embossing roller is 135° C. and the pressure of the embossing roller is 25 kg.

[0056] Comparative Example

[0057] S1': A1 and B1 are used as raw materials to coat the release paper to prepare the TPU layer and PVC wear-resistant layer;

[0058] S2': sequentially compounding a PVC pressure-resistant unit layer (drying and plasticizing), a composite polyester fiber mesh layer, a coated PVC pressure-resistant unit layer (drying and plasticizing), a composite fiber stabilization layer, and a foaming layer (heated and foamed) on the PVC wear-resistant layer to obtain a foamed composite structure having a PVC wear-resistant surface layer and a foamed bottom layer;

[0059] S3': The TPU layer is heated to 90°C, and the PVC wear-resistant layer of the foamed composite structure is heated to 130°C. The pressure of the composite roller is 25 kg, and hot pressing is performed. Then, the embossing treatment of S5 is adopted. The feeding speed of the composite film is the same as that of S4 and S5.

[0060] 3. Use a tensile tester to test the peel strength (PS1) of the TPU wear-resistant surface layer / PVC wear-resistant layer of the sample flooring.

[0061] 4. The peel strength test results of the TPU resin mixture, PVC wear-resistant layer raw material and floor glue layer used in the embodiment are shown in the following table:

[0062]

[0063]

[0064] *The TPU wear-resistant surface layer is produced by cast film production. Since the sample is taken in the middle of the coil sample, the TPU wear-resistant surface layer and the PVC wear-resistant layer are tightly attached at the circumferential incision of the sample. In floor glue testing, when the peel strength of the TPU wear-resistant surface layer and the PVC wear-resistant layer is greater than 60N / m, it is usually impossible to completely separate the interface of the TPU and PVC by means of a blade or other means to clamp the floor glue sample for the tensile tester.

[0065] Examples 1 and 2, and Examples 6 and 7 form controls in which the TPU resin mixture contains a silane coupling agent. When the silane coupling agent is added to the TPU resin mixture, the long chains of the silane coupling agent entangle with the polar PVC molecular chains, forming weak hydrogen bonding forces, thereby improving the compatibility of the TPU cast layer and the PVC wear-resistant layer. Furthermore, the aminosilane coupling agent contains free amino groups, has high alkalinity, and has high reactivity. Therefore, the peel strength of Examples 3 and 8 containing the aminosilane coupling agent KH550 is higher than that of the corresponding Examples 2 and 7.

[0066] On the basis of containing aminosilane coupling agent, carbonized diimide and amino polyacid are further added to the TPU resin mixture, which has no obvious effect on the improvement of peel strength; introducing carboxyl-type chlorovinyl resin into PVC increases the carboxyl groups on the surface of the PVC wear-resistant layer, and carbonized diimide further activates the carboxyl groups. The small molecular amino polycarboxylic acid in the viscous TPU resin mixture is more likely to migrate to the surface of the TPU resin mixture and cross-link with the carboxyl groups, further improving the peel strength of the TPU cast layer and the PVC wear-resistant layer.

[0067] Iminodiacetic acid is a secondary amine and has low activity in the carboxyl acylation reaction on the surface of the PVC wear-resistant layer. In Examples 4 and 9, although the content of iminodiacetic acid in the TPU resin mixture is higher, the peel strength between the TPU cast layer and the PVC wear-resistant layer is lower than that of the corresponding Example 5 and Example 10.

[0068] 5. Influence of process parameters on peeling strength between floor glue layers

[0069] Examples 11-12

[0070] The process parameters of Examples 11-12 are compared with those of Example 10, except that: in Example 11, the TPU wear-resistant layer is heated to 85° C. by hot pressing and laminating, and the pressure of the hot pressing and laminating roller in Example 12 is 17 kg.

[0071] In Example 13, only the wear-resistant layer was cast and composited, and the peel strength test was performed on the TPU wear-resistant surface layer and the PVC wear-resistant layer in the wear-resistant layer of the composite structure.

[0072] Example 14 only includes hot pressing compounding, and the TPU surface is not embossed.

[0073] The peel strength test results of the floor glue layers of Examples 11-14 are shown in the table below:

[0074] PS1(N / m) Example 10 >60 (see table above*) Example 11 52 Example 12 55 Example 13 40 Example 14 51

[0075] The hot pressing compounding temperature is low, the small molecule amino polycarboxylic acid is not easy to migrate, and the cross-linking density of the TPU and PVC interface is reduced, resulting in a decrease in peel strength;

[0076] Appropriate hot pressing lamination roller pressure is also conducive to improving the peel strength of the TPU wear-resistant surface layer and the PVC wear-resistant layer in the floor glue;

[0077] In addition to casting to prepare the TPU wear-resistant surface layer, hot pressing compounding and TPU wear-resistant surface embossing both heat the TPU layer. Both steps can further strengthen the bonding strength between the TPU wear-resistant surface layer and the PVC wear-resistant layer in the floor glue.

[0078] 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 technical 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 method for producing floor covering with a polyurethane elastomer surface layer, characterized in that: The flooring with a polyurethane elastomer surface layer comprises a wear-resistant layer, a PVC pressure-resistant layer, a fiber stabilization layer, and a foaming layer stacked sequentially from the top to the bottom, wherein the wear-resistant layer comprises a cast composite TPU wear-resistant surface layer and a PVC wear-resistant layer, wherein the TPU wear-resistant surface layer is a cast layer; and the production method comprises the following steps: S1: preparing a PVC wear-resistant layer, casting a TPU resin mixture on the surface of the PVC wear-resistant layer, and curing it to obtain a wear-resistant layer composed of a TPU wear-resistant surface layer and a PVC wear-resistant layer; S2: Composite production of a PVC pressure-resistant layer, a fiber stabilization layer, and a foaming layer on the release surface of the release paper. After foaming, the foaming layer is subjected to heat embossing treatment, and the release paper is removed to obtain a composite bottom layer. S3: heating the wear-resistant layer and the composite bottom layer, hot pressing and laminating them, and performing heat embossing on the TPU surface of the wear-resistant layer to obtain a flooring rubber having a polyurethane elastomer surface layer; Calculated by mass, the main components of the TPU resin mixture are 100 parts of thermoplastic polyurethane, 2 to 12 parts of ultraviolet absorber, 1 to 5 parts of antioxidant, 5 to 20 parts of masterbatch, and 0.2 to 3 parts of silane coupling agent; the main components of the raw materials of the PVC wear-resistant layer include 100 parts of polyvinyl chloride paste resin, 20 to 50 parts of plasticizer, and 0.3 to 3 parts of stabilizer; based on the added mass of the components in 100 parts of thermoplastic polyurethane, the TPU resin mixture also includes 1 to 4.5 parts of carbonized diimide and 0.1 to 1.3 parts of C4 to C8 amino polyacid having primary amine and / or secondary amine groups; the raw materials of the PVC wear-resistant layer also include 1.5 to 8 parts of carboxylic acid-type ternary chloroacetic acid resin.

2. The method for producing floor covering with a polyurethane elastomer surface layer according to claim 1, characterized in that: The amino polyacid is at least one selected from glutamic acid and aspartic acid.

3. The method for producing floor covering with a polyurethane elastomer surface layer according to claim 1, characterized in that: The silane coupling agent is an aminosilane coupling agent.

4. The method for producing floor covering with a polyurethane elastomer surface layer according to claim 1, characterized in that: The TPU casting temperature in S1 is 110-130°C; the temperature of the hot-pressed composite wear-resistant layer in S3 is 80-100°C, the temperature of the composite bottom layer is 120-140°C, and the pressure is 20-30 kg.

5. The method for producing floor covering with a polyurethane elastomer surface layer according to claim 1, characterized in that: The temperature of the heating embossing treatment in S3 is 130-140° C., and the pressure is 20-30 kg.

6. The method for producing floor covering with a polyurethane elastomer surface layer according to claim 1, characterized in that: The PVC pressure-resistant layer includes a mesh cloth layer and two PVC pressure-resistant unit layers, and the mesh cloth layer is embedded between the two PVC pressure-resistant unit layers.

Images