Preparation method of nano-composite durable antibacterial foaming TPE yoga mat and product of nano-composite durable antibacterial foaming TPE yoga mat

Abstract

The invention relates to the related field of high polymer material processing, in particular to a preparation method of a nano-composite durable antibacterial foaming TPE yoga mat and a product, and the preparation method comprises the following steps: preparing core-shell antibacterial master batches; dynamically foaming; gradient warm-pressing forming is conducted; and carrying out surface functionalization. The silver-loaded zeolite nano antibacterial master batch is introduced into a TPE matrix, and dynamic foaming and surface functionalization processes are combined, so that a double antibacterial mechanism of silver ion slow release and quaternary ammonium salt grafting is realized, and the yoga mat is endowed with lasting and efficient antibacterial performance; meanwhile, the master batch structure avoids uneven foaming and mechanical property reduction, so that the product keeps excellent elasticity, rebound resilience and compression resistance; furthermore, the heat resistance and the surface bonding firmness of the antibacterial agent are obviously improved, the antibacterial layer is not easy to wear and fall off, and the stability of long-term use is ensured; in addition, the antibacterial agent is low in seepage rate, and the product is safe and environment-friendly, has the characteristics of skid resistance, comfort and durability, and has a wide market application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polymer material processing, and in particular to a preparation method of an antibacterial yoga mat based on a thermoplastic elastomer (TPE) foaming process and a product. BACKGROUND

[0002] As a commonly used sports aid, yoga mats are mainly used to provide support, cushioning and anti-slip functions, and are widely used in yoga, fitness, physiotherapy and home exercise scenarios. The yoga mat materials on the market at present mainly include polyvinyl chloride (PVC), natural rubber, thermoplastic elastomer (TPE) and EVA, etc. Among them, TPE material gradually becomes the mainstream material for yoga mat production due to its excellent elasticity, moderate softness, recyclability and environmental protection, and non-toxicity.

[0003] However, the existing TPE yoga mats generally have the following shortcomings: 1. The traditional TPE yoga mat has poor antibacterial property and is prone to bacterial / mold growth; 2. Adding inorganic antibacterial agents (such as silver ions) can easily lead to uneven foaming and a decrease in mechanical properties; 3. Organic antibacterial agents (such as quaternary ammonium salts) have poor heat resistance and are prone to decomposition and failure during high-temperature foaming; 4. The existing antibacterial layer has weak adhesion to the substrate and is prone to wear and tear. SUMMARY

[0004] Therefore, the present application provides a preparation method of a nano-composite long-lasting antibacterial foaming TPE yoga mat and a product to solve the above technical problems.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme: a preparation method of a nano-composite long-lasting antibacterial foaming TPE yoga mat, comprising the following steps: S1, preparing a core-shell antibacterial masterbatch: mixing silver-loaded zeolite nano-powder and maleic anhydride grafted SEBS at a mass ratio of 1:3 in a mixer to granulate; S2, dynamic foaming: placing TPE substrate, masterbatch obtained in step S1, foaming agent AC and crosslinking agent DCP in a mixer, and mixing and foaming at 140-160°C; S3, gradient temperature press forming: placing the foaming blank in a double-roller calender, and sequentially performing three-stage pressing; S4, surface functionalization: UV irradiation grafting of acryloyloxyethyl dimethyl benzyl ammonium chloride at 70°C.

[0006] Preferably, the silver loading of the silver-loaded zeolite in step S1 is 3.5-4.2wt%, and the particle size D50 is ≤80nm.

[0007] Preferably, the amount of foaming agent AC in step S2 is 1.2-1.8wt% of the TPE substrate.

[0008] Preferably, the amount of crosslinking agent DCP in step S2 is 0.3-0.5wt%.

[0009] Preferably, the three-stage pressing in step S3 includes 160℃ / 5MPa→120℃ / 8MPa→70℃ / 3MPa.

[0010] The present application provides a yoga mat prepared by the above preparation method, and the surface antibacterial agent bleeding rate is ≤0.1μg / cm 2 ·day.

[0011] The beneficial effects of the present application are: The present application realizes the dual antibacterial mechanism of silver ion slow release and quaternary ammonium salt grafting by introducing silver-loaded zeolite nano-antibacterial master batch into the TPE matrix and combining dynamic foaming and surface functionalization process, which endows the yoga mat with persistent and efficient antibacterial performance; at the same time, the master batch structure avoids uneven foaming and mechanical property decline, so that the product maintains excellent elasticity, resilience and compression resistance; further, the heat resistance and surface binding strength of the antibacterial agent are significantly improved, the antibacterial layer is not easy to wear off, which ensures the stability of long-term use; in addition, the antibacterial agent has low bleeding rate, the product is safe and environmentally friendly, and has the characteristics of anti-skid, comfort and durability, which has broad market application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a process flow diagram of the present application. DETAILED DESCRIPTION

[0013] In order to further explain the technical scheme of the present application, the following specific embodiments are described in detail.

[0014] As Figure 1 shown, the present application provides a preparation method of nano-composite persistent antibacterial foaming TPE yoga mat, including the following steps: S1, preparing core-shell antibacterial master batch: mixing silver-loaded zeolite nano-powder and maleic anhydride grafted SEBS at a mass ratio of 1:3 by intensive mixing and granulation, wherein the silver loading of silver-loaded zeolite is 3.5-4.2wt%, and the particle size D50 is ≤80nm; S2, dynamic foaming: placing TPE substrate, master batch obtained in step S1, foaming agent AC and crosslinking agent DCP in an intensive mixer, and mixing and foaming at 140-160℃, wherein the amount of foaming agent AC is 1.2-1.8wt% of the TPE substrate, and the amount of crosslinking agent DCP is 0.3-0.5wt%; S3, gradient temperature pressing: placing the foaming blank in a double-roller calender, and sequentially performing three-stage pressing; S4, surface functionalization: UV irradiation grafting acryloyloxyethyl dimethyl benzyl ammonium chloride at 70℃.

[0015] The three-stage pressing in step S3 includes 160℃ / 5MPa→120℃ / 8MPa→70℃ / 3MPa, specifically: Stage 1: pre-foaming (forming open cell structure) at 160℃ / 5MPa; Stage 2: hot pressing and shaping (surface micropore closure, locking antibacterial particles) at 120℃ / 8MPa; Stage 3: UV irradiation curing (surface grafting of antibacterial quaternary ammonium salt) at 70℃ / 3MPa.

[0016] The yoga mat prepared by the above preparation method has a surface antibacterial agent bleeding rate of ≤0.1 μg / cm 2 ·day, as measured by ISO 22196 standard test.

[0017] The specific implementation steps include the following: S10, 4kg of silver-loaded zeolite (Ag⁺ content 4.0%) is mixed with 12kg of MAH-g-SEBS at 160℃ in an internal mixer to prepare antibacterial masterbatch; S20, 100kg of SEBS / EVA blend (70:30), 8kg of antibacterial masterbatch, 3.5kg of AC foaming agent, and 0.5kg of DCP are put into the internal mixer, and dynamic foaming is carried out at 155℃ for 20min; S30, the foamed blank is gradient pressed by three-roll calender: Roll 1: 160℃ / 5MPa / speed ratio 1.2; Roll 2: 120℃ / 8MPa / speed ratio 1.0; Roll 3: 70℃ / 3MPa / speed ratio 0.8; S40, the calendered sheet is irradiated by UV irradiation equipment (wavelength 254nm, intensity 80mW / cm 2 ), and the surface is sprayed with 1% acryloyloxyethyl dimethyl benzyl ammonium chloride solution, and irradiated and cured for 30s.

[0018] Test results Test items TPE yoga mat of the present invention Conventional TPE yoga mat Antibacterial rate (30 days, E. coli) 99.9% 90% Density (g / cm 3 ) 0.35 0.33 Rebound rate (%) 82 75 Antibacterial durability (30 times of washing) 99.5% Less than 70% The application provides a preparation method and product of a nano-composite long-lasting antibacterial foaming TPE yoga mat. By introducing a silver-loaded zeolite nano-antibacterial master batch into a TPE matrix and combining a dynamic foaming process and a surface functionalization process, a double antibacterial mechanism of silver ion slow release and quaternary ammonium salt grafting is realized, so that the yoga mat is endowed with long-lasting and efficient antibacterial performance. Meanwhile, the master batch structure avoids uneven foaming and mechanical property reduction, so that the product maintains excellent elasticity, resilience and compression resistance. Further, the heat resistance and surface binding stability of the antibacterial agent are significantly improved, the antibacterial layer is not easy to wear and fall off, and the stability during long-term use is ensured. In addition, the antibacterial agent has low leaching rate, the product is safe and environmentally friendly, has the characteristics of anti-skid, comfort and durability, and has a wide market application prospect.

[0019] The above only describes the preferred examples of the application and is not intended to limit the application. Although the application has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for preparing a nanocomposite durable antibacterial foamed TPE yoga mat, characterized in that: Includes the following steps: S1. Preparation of core-shell antibacterial masterbatch: Silver-loaded zeolite nanoparticles and maleic anhydride-grafted SEBS are mixed and granulated at a mass ratio of 1:

3. S2, Dynamic foaming: Place the TPE substrate, the masterbatch obtained in step S1, the foaming agent AC, and the crosslinking agent DCP in an internal mixer and mix and foam at 140-160℃. S3, Gradient temperature pressing molding: The foamed preform is placed in a two-roll calender and pressed in three stages in sequence; S4. Surface functionalization: Acryloyloxyethyl dimethyl benzyl ammonium chloride grafted by UV irradiation at 70℃.

2. The method for preparing a nanocomposite durable antibacterial foamed TPE yoga mat according to claim 1, characterized in that: In step S1, the silver loading of the silver-loaded zeolite is 3.5-4.2 wt%, and the particle size D50 ≤ 80 nm.

3. The method for preparing a nanocomposite durable antibacterial foamed TPE yoga mat according to claim 1, characterized in that: In step S2, the amount of foaming agent AC used is 1.2-1.8 wt% of the TPE substrate.

4. The method for preparing a nanocomposite durable antibacterial foamed TPE yoga mat according to claim 1, characterized in that: In step S2, the amount of crosslinking agent DCP used is 0.3-0.5 wt%.

5. The method for preparing a nanocomposite durable antibacterial foamed TPE yoga mat according to claim 1, characterized in that: The three-stage pressing in step S3 includes 160℃ / 5MPa → 120℃ / 8MPa → 70℃ / 3MPa.

6. A yoga mat prepared by the method according to any one of claims 1-5, characterized in that: The surface antibacterial agent has a penetration rate of ≤0.1 μg / cm³. 2 ·day.

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