Anti-bending and pressure-friendly PVC pad and preparation method thereof

Abstract

The application discloses an anti-bending and pressure-resistant skin-friendly PVC pad and relates to the technical field of foamed materials. The anti-bending and pressure-resistant skin-friendly PVC pad comprises a bottom layer and a surface layer. The raw materials for preparing the bottom layer and the surface layer both comprise, in terms of weight fractions, 120-140 parts of first PVC paste resin powder, 120-140 parts of second PVC paste resin powder, 270-330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10-12 parts of a foaming agent and 7-8 parts of a stabilizer. The anti-bending and pressure-resistant skin-friendly PVC pad is prepared by using the first PVC paste resin powder, the second PVC paste resin powder and the cyclohexane-1,2-dicarboxylic acid diisooctyl ester in combination, so that the PVC pad with the anti-bending and pressure-resistant performance and the better skin feeling can be prepared. In addition, due to the special molecular structure of the cyclohexane-1,2-dicarboxylic acid diisooctyl ester, the cyclohexane-1,2-dicarboxylic acid diisooctyl ester can be cross-wound with the long chain of the PVC and cannot be separated from the pad body, so that the PVC pad is more environmentally friendly and more popular among consumers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foamed materials, in particular to an anti-folding and pressure-skin-friendly PVC pad and a preparation method thereof. BACKGROUND

[0002] Since PVC is lower in cost than EVA or TPE, it is widely used as the material of yoga mats and sports mats. However, the existing PVC yoga mats or sports mats have the following defects: (1) The existing PVC pad has poor skin-friendliness, although it has good elasticity, which leads to a decrease in comfort during exercise, because the yoga mat or sports mat is usually in direct contact with the skin during use; (2) The existing PVC yoga mat has poor anti-folding performance, and folds are easily left after folding, which affects the appearance; (3) In order to improve the toughness, a plasticizer such as methyl phthalate is added during the preparation of the existing PVC pad, but the plasticizer is generally precipitated during use, which affects human health.

[0003] It can be seen that the prior art still needs to be improved and enhanced. SUMMARY

[0004] In view of the shortcomings of the prior art, the purpose of the present application is to provide an anti-folding and pressure-skin-friendly PVC pad and a preparation method thereof, which aims to solve the defects of the existing PVC pad, such as poor skin-friendliness, poor anti-folding performance, and easy precipitation of plasticizers.

[0005] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0006] An anti-folding and pressure-skin-friendly PVC pad, wherein the PVC pad comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer each comprise, by weight fraction: 120-140 parts of first PVC paste resin powder, 120-140 parts of second PVC paste resin powder, 270-330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10-12 parts of foaming agent, and 7-8 parts of stabilizer; the average polymerization degree of the first PVC paste resin and the second PVC paste resin differs by 300-700.

[0007] In the anti-folding and pressure-skin-friendly PVC pad, the average polymerization degree of the first PVC paste resin powder is 1500-1700, and the average polymerization degree of the second PVC paste resin powder is 1000-1200.

[0008] In the anti-folding and pressure-skin-friendly PVC pad, the raw materials for preparing the bottom layer and the surface layer further comprise 20-30 parts of modified filler, and the modified filler is obtained by modifying an inorganic filler with a surfactant.

[0009] In the anti-folding and pressure-skin-friendly PVC pad, the inorganic filler is a spherical particle-shaped powder.

[0010] The inorganic filler in the anti-bending and pressure-skin-friendly PVC pad has a particle size of 2000-2500 mesh.

[0011] The inorganic filler in the anti-bending and pressure-skin-friendly PVC pad includes one of spherical particle-shaped light calcium carbonate, white carbon black and titanium dioxide.

[0012] The surfactant in the anti-bending and pressure-skin-friendly PVC pad is a silicone-modified epoxy resin.

[0013] A preparation method of an anti-bending and pressure-skin-friendly PVC pad is used to prepare the anti-bending and pressure-skin-friendly PVC pad, wherein the preparation method comprises the following steps:

[0014] Step S01. Preparation of a bottom layer slurry: the bottom layer raw materials are taken according to the proportion, stirred and uniformly mixed, the viscosity is measured, and when the viscosity reaches the requirement, the bottom layer slurry is obtained for standby;

[0015] Step S02. Preparation of a surface layer slurry: the surface layer raw materials are taken according to the proportion, stirred and uniformly mixed, and the surface layer slurry is obtained for standby;

[0016] Step S03. Coating and foaming: the bottom layer slurry is coated on the polyester silk screen cloth first, and after plasticizing and shaping, the surface layer slurry is coated and scraped, and then the coating and scraping are completed, and the foaming furnace is sent in for foaming.

[0017] In the preparation method of the anti-bending and pressure-skin-friendly PVC pad, in the step S01, the viscosity is not less than 20000 mPa.s.

[0018] In the preparation method of the anti-bending and pressure-skin-friendly PVC pad, in the step S03, the foaming temperature is 160-220℃. Beneficial effects

[0019] The anti-bending and pressure-skin-friendly PVC pad and the preparation method thereof are provided, the first PVC paste resin powder and the second PVC paste resin powder with a large difference in average polymerization degree are used in cooperation with cyclohexane-1,2-dicarboxylic acid diisooctyl ester, the PVC pad with the anti-bending and pressure performance and the better skin feeling can be prepared, and due to the special molecular structure of the cyclohexane-1,2-dicarboxylic acid diisooctyl ester, the cyclohexane-1,2-dicarboxylic acid diisooctyl ester can be cross-wound with the long chain of the PVC and cannot be separated from the pad body, which is more environmentally friendly and more popular with consumers. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The flow chart of the preparation method of the anti-bending and pressure-skin-friendly PVC pad provided by the present application is provided. DETAILED DESCRIPTION

[0021] The application provides an anti-bending and pressure-resistant skin-friendly PVC pad and a preparation method thereof. The application is further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the application and not to limit the application.

[0022] The anti-bending and pressure-resistant skin-friendly PVC pad provided by the preferred embodiment of the application comprises a bottom layer, a surface layer and a polyester filament screen cloth arranged between the bottom layer and the surface layer. The thicknesses of the bottom layer and the surface layer are the same, so that the polyester filament screen cloth is arranged at the middle position of the pad body. The raw materials for preparing the bottom layer and the surface layer each comprise, in parts by weight, 120-140 parts of first PVC paste resin powder, 120-140 parts of second PVC paste resin powder, 270-330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10-12 parts of foaming agent and 7-8 parts of stabilizer. The average polymerization degrees of the first PVC paste resin and the second PVC paste resin differ by 300-700.

[0023] In the embodiment, the cyclohexane-1,2-dicarboxylic acid diisooctyl ester is used as a plasticizer and is used in combination with the first PVC paste resin powder and the second PVC paste resin powder whose average polymerization degrees differ by 300-700 to form a complex cross-linking structure, which can greatly improve the toughness, elasticity and skin-friendliness of the pad body. The cyclohexane-1,2-dicarboxylic acid diisooctyl ester has two adjacent branches on the cyclohexane and is usually in a cis structure. The two branches can be wound around the PVC molecular chain during preparation, thereby greatly improving the toughness of the pad body and enabling the pad body to quickly return to the original state once the pressure is removed when the pad body is subjected to bending and pressure. In addition, the cyclohexane-1,2-dicarboxylic acid diisooctyl ester is wound around the PVC chain and has a large molecular weight, so that the plasticizer does not separate out during use, which is more environmentally friendly. Furthermore, the two branches of the cyclohexane-1,2-dicarboxylic acid diisooctyl ester can extend to the surface of the pad body to form a microstructure with synapses, thereby enabling the prepared pad body to have skin-friendliness and a higher comfort level when the human body contacts the pad body, which is more popular with consumers.

[0024] In a preferred embodiment, the polymerization degree of the first PVC paste resin powder is 1500-1700, and the polymerization degree of the second PVC paste resin powder is 1000-1200. Since the polymerization degrees of the first PVC paste resin and the second PVC paste resin are both high, the molecular chains are long, and the polymerization degrees of the two PVC paste resins differ greatly, the combination of the cyclohexane-1,2-dicarboxylic acid diisooctyl ester can form a gradation, the cross-linking between the chains is more complex, and the interaction is stronger, so that the prepared pad body has better toughness and elasticity and stronger anti-bending and pressure-resistant performance.

[0025] In a preferred embodiment, 20-30 parts of modified fillers are added to the raw materials for preparing the surface layer and the bottom layer, wherein the modified fillers are obtained by modifying inorganic fillers with a surface active agent. The inorganic fillers include one of spherical granular light calcium carbonate, white carbon black and titanium white powder; and the surface active agent is silicone modified epoxy resin. The silicone modified epoxy resin can improve the dispersibility and compatibility of the inorganic fillers in the resin, and the modified fillers have stronger combination with the resin and better apparent touch feeling. In this embodiment, the modified fillers can not only reduce the cost and improve the strength, but also form granular microstructure on the surface of the pad, so that the surface of the pad is more delicate and the skin-friendly effect is improved.

[0026] In a preferred embodiment, the inorganic fillers are spherical granular powder with a particle size distribution of 2000-2500 mesh. The spherical granular powder has better dispersibility, and can form granular microstructure on the surface of the pad, so that the apparent touch feeling of the pad is better and the skin-friendly effect is stronger.

[0027] It should be noted that the stabilizer can be calcium zinc stabilizer or other agents with thermal stability effect, and preferably is calcium zinc stabilizer; and the foaming agent can be azodicarbonamide or other agents with foaming effect, and preferably is azodicarbonamide.

[0028] The application further provides a preparation method of the anti-bending and pressure skin-friendly PVC pad, which is used for preparing the anti-bending and pressure skin-friendly PVC pad as described above. Figure 1 The preparation method includes the following steps:

[0029] Step S01. Preparing bottom layer slurry: the bottom layer raw materials are taken according to the proportion, stirred and uniformly mixed, the viscosity is measured, and the bottom layer slurry is obtained when the viscosity reaches the requirement, which is ready for use.

[0030] Step S02. Preparing surface layer slurry: the surface layer raw materials are taken according to the proportion, stirred and uniformly mixed, and the surface layer slurry is obtained, which is ready for use.

[0031] Step S03. Coating and foaming: the bottom layer slurry is coated on the polyester silk screen cloth, and the surface layer slurry is coated after plasticizing and shaping, and then the foaming furnace is entered for foaming.

[0032] In this embodiment, the polyester silk screen cloth is between the bottom layer and the surface layer by two coating methods, so that the toughness and elasticity of the polyester silk screen cloth on both sides are relatively close, and thus the pad has good recovery when being bent and pressed to either side, and the anti-bending and pressure ability is better.

[0033] In order to make the polyester filament screen cloth in the middle position, therefore, when the primer is coated, the primer is allowed to penetrate the polyester filament screen cloth as much as possible, but at the same time, the primer is not allowed to drop. In this regard, in a preferred embodiment, the viscosity of the primer in the step S01 is not less than 20000 mPa.s. By controlling the viscosity of the primer, the primer can be well coated without dropping, but at the same time, the primer is easy to be coated, and the primer can penetrate the polyester filament screen cloth below. After the fabric layer is coated, the polyester filament screen cloth can be in the middle position.

[0034] In order to better foam, the foaming temperature in the step S03 is 160-220℃. Specifically, the temperature of each zone of the foaming furnace is as follows: the temperature of the first zone is 185-190℃, the temperature of the second zone is 210-215℃, the temperature of the third zone is 210-215℃, and the temperature of the fourth zone is 160-165℃.

[0035] In order to further illustrate the anti-bending and pressure-skin-friendly PVC pad and the preparation method thereof provided by the present application, the following examples are provided. Example

[0036] An anti-bending and pressure-skin-friendly PVC pad, comprising a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 130 parts of first PVC paste resin powder, 130 parts of second PVC paste resin powder, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent, and 8 parts of stabilizer. The average polymerization degree of the first PVC paste resin powder is 1600, and the average polymerization degree of the second PVC paste resin powder is 1100.

[0037] The preparation method of the anti-bending and pressure-skin-friendly PVC pad comprises the following steps:

[0038] Step S01. Preparation of primer: the primer is prepared by mixing the first PVC paste resin powder, the second PVC paste resin powder, the stabilizer, and the foaming agent according to the proportion, then the cyclohexane-1,2-dicarboxylic acid diisooctyl ester is added to the mixture, and the mixture is stirred to be uniform, and the viscosity of the primer is measured. When the viscosity reaches 20000 mPa.s, the primer is obtained and is ready for use.

[0039] Step S02. Preparation of surface layer primer: the surface layer primer is prepared by mixing the first PVC paste resin powder, the second PVC paste resin powder, the stabilizer, and the foaming agent according to the proportion, then the cyclohexane-1,2-dicarboxylic acid diisooctyl ester is added to the mixture, and the mixture is stirred to be uniform, and the surface layer primer is obtained and is ready for use.

[0040] Step S03. Coating and foaming: first, the primer slurry is coated on the terylene filament screen cloth, and when coating, the primer slurry is made to penetrate the terylene filament screen cloth as completely as possible, but not to drop the slurry. After the primer slurry is coated, it is first plasticized and shaped, the shaping temperature is 100-110℃, after shaping, the fabric layer slurry is coated, and after coating, it is sent into the foaming furnace for foaming, the temperature of each zone in the foaming furnace is: the temperature of the first zone is 185-190℃, the temperature of the second zone is 210-215℃, the temperature of the third zone is 210-215℃, and the temperature of the fourth zone is 160-165℃. After foaming, the anti-bending and pressure skin-friendly PVC pad is obtained. Embodiment

[0041] An anti-bending and pressure skin-friendly PVC pad, comprising a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 120 parts of first PVC paste resin powder, 140 parts of second PVC paste resin powder, 270 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 12 parts of foaming agent, and 8 parts of stabilizer. The average polymerization degree of the first PVC paste resin powder is 1700, and the average polymerization degree of the second PVC paste resin powder is 1000. Embodiment

[0042] An anti-bending and pressure skin-friendly PVC pad, comprising a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 140 parts of first PVC paste resin powder, 120 parts of second PVC paste resin powder, 330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10 parts of foaming agent, and 7 parts of stabilizer. The average polymerization degree of the first PVC paste resin powder is 1500, and the average polymerization degree of the second PVC paste resin powder is 1200. Embodiment

[0043] An anti-bending and pressure skin-friendly PVC pad, comprising a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 130 parts of first PVC paste resin powder, 130 parts of second PVC paste resin powder, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent, 7 parts of stabilizer, and 25 parts of modified filler. The average polymerization degree of the first PVC paste resin powder is 1600, and the average polymerization degree of the second PVC paste resin powder is 1100. The modified filler is light calcium carbonate modified by an organosilicon modified epoxy resin. Embodiment

[0044] The anti-bending and pressure-skin-friendly PVC pad comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 120 parts of first PVC paste resin powder, 120 parts of second PVC paste resin powder, 270 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10 parts of foaming agent, 7 parts of stabilizer and 30 parts of modified filler. The average polymerization degree of the first PVC paste resin powder is 1500, and the average polymerization degree of the second PVC paste resin powder is 1200. The modified filler is obtained by modifying the surface of white carbon black with silicone-modified epoxy resin. Embodiment

[0045] The anti-bending and pressure-skin-friendly PVC pad comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 140 parts of first PVC paste resin powder, 140 parts of second PVC paste resin powder, 330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 12 parts of foaming agent, 8 parts of stabilizer and 20 parts of modified filler. The average polymerization degree of the first PVC paste resin powder is 1700, and the average polymerization degree of the second PVC paste resin powder is 1000. The modified filler is obtained by modifying the surface of titanium dioxide with silicone-modified epoxy resin.

[0046] It should be noted that the preparation method of Embodiments 2-6 is basically the same as that of Embodiment 1, wherein the modified filler in Embodiments 4-6 is added at the same time as the first PVC paste resin powder and the second PVC paste resin powder. In the preparation step, the slurry of the bottom layer is controlled to be above 20000 mPa.s, but not more than 22000 mPa.s. In addition, the modified fillers in Embodiments 1-6 are all spherical particles, and the particle size is in the range of 2000-2500 mesh.

[0047] Comparative Example 1

[0048] The PVC pad comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 130 parts of first PVC paste resin powder, 130 parts of second PVC paste resin powder, 300 parts of dioctyl terephthalate, 11 parts of foaming agent and 8 parts of stabilizer. The average polymerization degree of the first PVC paste resin powder is 1600, and the average polymerization degree of the second PVC paste resin powder is 1100.

[0049] Comparative Example 2

[0050] The PVC pad comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer both comprise, in parts by weight: 260 parts of PVC paste resin powder with an average polymerization degree of 1000, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent and 8 parts of stabilizer.

[0051] Comparative Example 3

[0052] A PVC cushion comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer each comprise, in parts by weight: 260 parts of PVC paste resin powder with an average polymerization degree of 1000, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent, 8 parts of stabilizer, and 25 parts of light calcium carbonate. The light calcium carbonate is a particle with irregular structure.

[0053] Comparative Example 4

[0054] A PVC cushion comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer each comprise, in parts by weight: 130 parts of PVC paste resin powder with an average polymerization degree of 1000, 130 parts of PVC paste resin powder with an average polymerization degree of 800, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent, and 8 parts of stabilizer.

[0055] Comparative Example 5

[0056] A PVC cushion comprises a bottom layer and a surface layer; the raw materials for preparing the bottom layer and the surface layer each comprise, in parts by weight: 130 parts of PVC paste resin powder with an average polymerization degree of 1700, 130 parts of PVC paste resin powder with an average polymerization degree of 800, 300 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 11 parts of foaming agent, and 8 parts of stabilizer.

[0057] The preparation method of Comparative Examples 1-5 is basically the same as that of Example 1.

[0058] It should be noted that the coating thickness of the bottom layer and the surface layer in Examples 1-6 and Comparative Examples 1-5 is the same, and the thickness of the cushion body obtained after foaming is in the range of 3.7-4.0 mm.

[0059] The bending pressure resistance, plasticizer bleeding, tensile strength, and skin-friendly performance of Examples 1-6 and Comparative Examples 1-5 are tested. The bending pressure resistance test is to fold the sample and press it under a pressure of 10 kg for 24 h, and then observe whether there is a pressure mark at the folded and pressed part after the pressure is removed for 30 min; the plasticizer bleeding test method is to place oil-absorbing paper above and below the sample, and then press the sample under a pressure of 10 kg at 80°C for 4 h, and then measure the weight of the sample to calculate the bleeding rate; the skin-friendly performance test is to touch the surface of the cushion body with the palm and back of the hand.

[0060] The test results are shown in Table 1.

[0061] Table 1. Performance test results

[0062]

[0063] From the content of Table 1, it can be seen that the anti-fold pressure skin-friendly PVC pad described in Examples 1-6 not only has good skin-friendly feeling and anti-fold pressure, but also has no plasticizer precipitation, is more environmentally friendly, and has very good tensile strength. Comparative Example 1 is based on replacing the plasticizer of Example 1 with dioctyl terephthalate. Since the molecular weight of dioctyl terephthalate is small, the plasticizer precipitation rate reaches 1.2%, which is obviously not environmentally friendly and healthy. At the same time, its anti-fold pressure and skin-friendly performance are worse than those of Example 1, it is difficult to restore to its original state after folding and pressing, and it is sticky to the touch and has poor skin feel. At the same time, its tensile strength is also not as good as that of Example 1. Although Comparative Example 2 uses cyclohexane-1,2-dicarboxylic acid diisooctyl ester as a plasticizer, the PVC resin used is a low average degree of polymerization resin, and a variety of PVC with different degrees of polymerization is not used. Therefore, its anti-fold pressure effect is insufficient, it is difficult to restore to its original state after folding and pressing, and there are still shallow folds. At the same time, its skin feel is also general. Comparative Example 3 adds light calcium carbonate based on Comparative Example 2. Since the light calcium carbonate is not surface modified, it not only cannot improve the skin feel, but also reduces the tensile strength. Comparative Example 4 uses two PVC paste resins with an average degree of polymerization difference of only 200, and Comparative Example 5 uses two PVC paste resins with an average degree of polymerization difference of 900. The pads prepared by the two have folds and have lower tensile strength than Example 1. The skin feel is also not as good as that of Example 1. It may be that the average degree of polymerization of the two PVC paste resins is too large or too small, which affects the grading effect, resulting in a decrease in toughness and skin feel.

[0064] Therefore, by using the first PVC paste resin powder, the second PVC paste resin powder, and the cyclohexane-1,2-dicarboxylic acid diisooctyl ester together, a PVC pad with anti-fold pressure performance and good skin feel can be prepared. Since the cyclohexane-1,2-dicarboxylic acid diisooctyl ester has a special molecular structure, it can cross and entangle with the long chains of PVC and will not precipitate from the pad, which is more environmentally friendly. The anti-fold pressure skin-friendly PVC pad prepared can be used as a yoga mat or a sports mat.

[0065] It can be understood that for those skilled in the art, equivalent replacements or changes can be made according to the technical solutions and inventive concepts of the present application, and all such changes or replacements shall fall within the scope of protection of the claims appended to the present application.

Claims

1. A fold-resistant, pressure-activated, skin-friendly PVC cushion, characterized in that, The bottom layer and the surface layer are prepared from the following raw materials: 120-140 parts of first PVC paste resin powder, 120-140 parts of second PVC paste resin powder, 270-330 parts of cyclohexane-1,2-dicarboxylic acid diisooctyl ester, 10-12 parts of foaming agent, and 7-8 parts of stabilizer.

2. The anti-bending and pressure-skin-friendly PVC pad according to claim 1, characterized in that, The raw materials for preparing the bottom layer and the surface layer further include 20-30 parts of modified filler, which is obtained by modifying inorganic filler with surfactant.

3. The anti-bending and pressure-friendly PVC pad according to claim 2, characterized in that, The inorganic filler is in the form of spherical particles.

4. The anti-bending and pressure-friendly PVC pad according to claim 3, characterized in that, The particle size of the inorganic filler is 2000-2500 mesh.

5. The anti-fold and pressure sensitive skin-friendly PVC pad according to claim 4, characterized in that, The inorganic filler includes one of spherical particle light calcium carbonate, white carbon black and titanium white powder.

6. The anti-fold and pressure sensitive skin-friendly PVC pad according to claim 5, characterized in that, The surfactant is silicone modified epoxy resin.

7. A method for the preparation of a flex and pressure resistant skin-friendly PVC mat according to any one of claims 1 to 6, characterized in that The preparation method includes the following steps: Step S01. Preparing bottom layer slurry: the raw materials for the bottom layer are taken in proportion, stirred and mixed uniformly, the viscosity is measured, and the bottom layer slurry is obtained when the viscosity reaches the requirement, which is ready for use; Step S02. Preparing surface layer slurry: the raw materials for the surface layer are taken in proportion, stirred and mixed uniformly, and the surface layer slurry is obtained, which is ready for use; Step S03. Coating, scraping and foaming: the bottom layer slurry is coated on the polyester silk screen cloth first, and then the surface layer slurry is coated and scraped after plasticizing and setting, and the coated and scraped product is sent into the foaming furnace for foaming.

8. The method for preparing the anti-bending and pressure-resistant skin-friendly PVC pad according to claim 7, characterized in that, In step S01, the viscosity is not less than 20000 mPa.s.

9. The method for preparing the anti-bending and pressure-resistant skin-friendly PVC pad according to claim 7, characterized in that, In step S03, the foaming temperature is 160-220℃.

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