Long-acting antibacterial and mildew-proof artificial leather and preparation method thereof

Abstract

This invention discloses a long-lasting antibacterial and mildew-resistant artificial leather, relating to the field of artificial leather preparation technology. It comprises a base fabric layer, a foaming layer, and a surface treatment layer sequentially composited. The foaming layer is prepared from the following raw materials in parts by weight: 100 parts polyvinyl chloride resin, 40-80 parts plasticizer, 2-8 parts stabilizer, 1-10 parts foaming agent, 0.5-8 parts antibacterial and mildew-resistant composite agent, and 1-10 parts additives. The antibacterial and mildew-resistant composite agent includes a supported inorganic antibacterial agent and an organic mildew-resistant agent. The supported inorganic antibacterial agent is one or more of silver-loaded zeolite, silver-loaded zirconium phosphate, nano-zinc oxide, and nano-copper oxide. This invention employs a dual-layer structure design where the foaming layer and surface treatment layer synergistically support the antibacterial and mildew-resistant composite agent, enabling the antibacterial active components to form a reservoir within the material and continuously exert their effects on the material surface, thereby significantly improving the long-lasting antibacterial and mildew-resistant performance of the artificial leather.

Description

Technical Field

[0001] This invention relates to the field of artificial leather preparation technology, specifically to a long-lasting antibacterial and antifungal artificial leather and its preparation method. Background Technology

[0002] Artificial leather is widely used in furniture, automotive interiors, bags, shoe materials, medical supplies, and public place decoration materials due to its advantages such as low cost, beautiful appearance, good wear resistance, and easy processing. Existing artificial leather mainly includes polyvinyl chloride (PVC) artificial leather and polyurethane (PU) synthetic leather. During use, it is often in high temperature, high humidity, or closed environment, which makes it easy for bacteria, mold, and other microorganisms to grow.

[0003] When microorganisms multiply in large numbers on the surface of materials, they can cause mold, discoloration, and odors on the surface of artificial leather, affecting the appearance and service life of the product. They may also produce harmful metabolites, posing a potential threat to human health. Therefore, giving artificial leather excellent and long-lasting antibacterial and anti-mildew properties has become an important direction for the development of the industry.

[0004] In existing technologies, antibacterial agents or antifungal agents are usually added directly during the production of artificial leather to improve the antibacterial and antifungal properties of the product. However, since most antibacterial agents and antifungal agents are dispersed inside the material, they are prone to migration, volatilization, loss or deactivation during long-term use, which leads to a rapid decline in the antibacterial and antifungal effect and makes it difficult to meet the needs of long-term use. In addition, some antibacterial agents have poor compatibility with the resin system and are prone to agglomeration, which affects the mechanical properties and surface quality of artificial leather.

[0005] Therefore, developing a type of artificial leather with long-lasting antibacterial and antifungal properties, stable antibacterial activity, minimal loss of antibacterial components, and a simple preparation process, as well as its preparation method, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] This invention provides a long-lasting antibacterial and antifungal artificial leather and its preparation method, which can effectively solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a long-lasting antibacterial and mildew-resistant artificial leather, comprising a base fabric layer, a foaming layer and a surface treatment layer sequentially compounded together; The foamed layer is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 40-80 parts of plasticizer, 2-8 parts of stabilizer, 1-10 parts of foaming agent, 0.5-8 parts of antibacterial and antifungal composite agent, and 1-10 parts of additives. The antibacterial and antifungal compound includes a loaded inorganic antibacterial agent and an organic antifungal agent; The supported inorganic antibacterial agent is one or more of the following: silver-loaded zeolite, silver-loaded zirconium phosphate, nano zinc oxide, and nano copper oxide; Organic fungicides are one or more of thiabendazole, isothiazolinone compounds, and IPBC; The surface treatment layer comprises polyurethane resin and an antibacterial and antifungal composite agent, wherein the antibacterial and antifungal composite agent is uniformly dispersed inside the surface treatment layer and partially exposed on the surface of the surface treatment layer.

[0008] According to the above technical solution, the supported inorganic antibacterial agent is formed by compounding silver-loaded zeolite, silver-loaded zirconium phosphate and nano zinc oxide in a mass ratio of (1-5):(1-3):(1-5).

[0009] According to the above technical solution, the organic antifungal agent is a compound system of thiabendazole and 3-iodo-2-propynyl butylcarbamate (IPBC), with a mass ratio of 1:(0.5-3).

[0010] According to the above technical solution, the antibacterial and antifungal composite agent adopts a microcapsule encapsulation structure. The microcapsule wall material is one or more of polyurethane, urea-formaldehyde resin, and melamine-formaldehyde resin, and the microcapsule particle size is 1-50 μm.

[0011] According to the above technical solution, the thickness of the foaming layer is 0.3-1.5 mm, the thickness of the surface treatment layer is 10-100 μm, and the amount of antibacterial and antifungal composite agent added in the foaming layer is 1.5-5 times that added in the surface treatment layer.

[0012] According to the above technical solution, a method for preparing long-lasting antibacterial and mildew-resistant artificial leather is provided, which involves the following steps: (1) A foaming slurry is prepared by mixing polyvinyl chloride resin, plasticizer, stabilizer, foaming agent, antibacterial and antifungal composite agent and additives; (2) The foaming slurry is coated on the surface of the base fabric layer and then heated to foam to form a foamed layer; (3) Coat the surface of the foamed layer with a polyurethane treatment liquid containing an antibacterial and antifungal composite agent, and then dry and cure it to form a surface treatment layer; (4) The long-lasting antibacterial and mildew-resistant artificial leather is obtained after embossing, cooling and winding; The antibacterial and antifungal composite agent is synergistically distributed in the foaming layer and the surface treatment layer, so that the resulting artificial leather maintains an antibacterial rate of not less than 99% and an antifungal level of 0 or 1 under long-term use conditions.

[0013] According to the above technical solution, the heating and foaming temperature in step (2) is 160-220℃ and the foaming time is 30-300s; the drying and curing temperature in step (3) is 80-150℃ and the curing time is 1-10min.

[0014] According to the above technical solution, the antibacterial and antifungal composite agent in step (1) is pre-dispersed using a high-speed disperser with a dispersion speed of 1000-5000 r / min and a dispersion time of 10-60 min, so that the antibacterial and antifungal composite agent is evenly dispersed in the foaming slurry; In step (1), the foamed slurry is coated after vacuum degassing treatment. The degassing vacuum degree is -0.06 to -0.10 MPa, and the degassing time is 5 to 30 min.

[0015] According to the above technical solution, in step (2), the foaming slurry is coated onto the surface of the base fabric layer by a scraper coating method, with a coating amount of 300-1200 g / m and a coating thickness of 0.3-2.0 mm.

[0016] According to the above technical solution, the polyurethane treatment liquid in step (3) is applied to the surface of the foam layer by two-roll coating, three-roll coating or spraying, and the mass percentage of antibacterial and mildew-proof composite agent in the treatment liquid is 0.1% to 10%. In step (4), the embossing temperature is 120-180℃, the embossing pressure is 2-10MPa, the embossing time is 5-60s, and the long-lasting antibacterial and mildew-resistant artificial leather is obtained after embossing and cooling.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention employs a dual-layer structure design with a foaming layer and a surface treatment layer synergistically loading an antibacterial and antifungal composite agent. This allows the antibacterial active components to form reservoirs within the material and continue to exert their effects on the material surface, thereby significantly improving the long-lasting antibacterial and antifungal performance of artificial leather.

[0018] This invention employs an inorganic antibacterial agent and an organic antifungal agent to form an antibacterial and antifungal composite system. The inorganic antibacterial agent can continuously release antibacterial active ions to achieve a broad-spectrum antibacterial effect; the organic antifungal agent can effectively inhibit the growth and reproduction of mold. The two work synergistically to achieve both antibacterial and antifungal functions.

[0019] The antibacterial and antifungal compound uses a microcapsule encapsulation structure, which can effectively reduce the loss of active ingredients during processing and control their slow release, thereby prolonging the antibacterial and antifungal effect time and improving long-term stability.

[0020] This invention optimizes the dispersion, foaming, and surface treatment processes of the antibacterial and antifungal compound, enabling the antibacterial and antifungal components to be evenly distributed inside and on the surface of artificial leather, effectively avoiding agglomeration and improving the consistency and stability of product performance.

[0021] The preparation method of this invention is simple, easy to industrialize and produce continuously, and does not require major modifications to existing artificial leather production equipment, thus having good application value.

[0022] The artificial leather produced by this invention has excellent antibacterial, anti-mildew, durable and environmentally adaptable properties, and has broad application prospects in furniture decoration, automotive interiors, medical supplies, public seating, bags and shoe materials. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0024] In the attached diagram: Figure 1 This is a schematic diagram of the method steps of the present invention. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] Example 1: like Figure 1 As shown, the present invention provides a technical solution: a long-lasting antibacterial and mildew-resistant artificial leather, comprising a base fabric layer, a foaming layer, and a surface treatment layer.

[0027] Preparation of foam layer: Weigh the following raw materials by weight: 100 parts of PVC resin (SG-5); 55 parts of dioctyl phthalate (DOP); 5 parts epoxidized soybean oil; 4 parts calcium-zinc stabilizer; 5 parts of azodicarbonamide foaming agent (AC foaming agent); 1 part zinc oxide activator; 3 parts of antibacterial and antifungal compound agent; Two portions of pigment paste.

[0028] The antibacterial and antifungal compound is prepared by compounding silver-loaded zeolite, nano zinc oxide and IPBC in a mass ratio of 3:2:1.

[0029] The above raw materials were added to a high-speed mixer and dispersed at 1200 r / min for 30 min to obtain a uniform foamed slurry; then placed in a vacuum degassing tank and degassed at -0.09 MPa for 15 min for later use.

[0030] The obtained foaming slurry was uniformly coated onto the surface of polyester knitted base fabric using a doctor blade coating method, with a coating amount of 650 g / m.

[0031] The coated base fabric is placed in a foaming oven and foamed at 190°C for 120 seconds to form a foam layer with a thickness of about 0.8 mm.

[0032] Surface treatment layer preparation: Weigh out by weight: 100 parts of waterborne polyurethane resin; Two parts of antibacterial and antifungal compound agent; 0.5 parts leveling agent; 0.3 parts of defoamer; 20 parts deionized water.

[0033] The surface treatment solution is prepared by stirring the above components evenly.

[0034] The surface treatment liquid was uniformly coated onto the surface of the foamed layer using a three-roller coating machine, with a coating amount of 40 g / m.

[0035] It is then dried and cured at 120°C for 5 minutes to form a surface treatment layer with a thickness of about 30 μm.

[0036] Embossing and shaping: The cured material is fed into an embossing machine and embossed for 20 seconds at 150°C and 5MPa. It is then cooled and shaped by a cooling roller and rolled up to obtain a long-lasting antibacterial and mildew-resistant artificial leather product.

[0037] Performance testing: 1. Antibacterial performance test The test was conducted in accordance with GB / T 20944.3-2008 "Evaluation of Antibacterial Properties of Textiles".

[0038] Test strains: Staphylococcus aureus (ATCC6538); Escherichia coli (ATCC8739).

[0039] Test results: Antibacterial rate against Staphylococcus aureus: 99.6%; Antibacterial rate against Escherichia coli: 99.4%.

[0040] 2. Anti-mildew performance test The test was conducted in accordance with GB / T 24128-2018 "Test Method for Anti-mildew Performance of Plastic Products".

[0041] The sample was placed in an environment with a temperature of (282)℃ and a relative humidity of over 95% for 28 days.

[0042] The results show: No obvious mold growth was observed on the sample surface; The mildew resistance level reaches level 0.

[0043] 3. Durability test The antibacterial properties of the sample were tested again after 50 wet scrubbing cycles.

[0044] The results show: The antibacterial rate against Staphylococcus aureus remains above 98.2%; The antibacterial rate against Escherichia coli remains above 97.8%; The anti-mildew level remains at or below level 1.

[0045] The results show that the artificial leather prepared in this embodiment has excellent and long-lasting antibacterial and antifungal properties, while maintaining good surface quality and durability.

[0046] Example 2: like Figure 1 As shown, the present invention provides a technical solution: a long-lasting antibacterial and antifungal artificial leather, comprising a base fabric layer, a foaming layer and a surface treatment layer, wherein the antibacterial and antifungal components adopt a microcapsule slow-release structure.

[0047] Preparation of antibacterial and antifungal microcapsules: Weigh out by weight: 20 parts of silver-loaded zeolite; 10 parts of nano zinc oxide; 8 copies of IPBC; 15 parts of polyurethane prepolymer; 2 parts emulsifier; 45 parts of deionized water.

[0048] First, silver-loaded zeolite, nano zinc oxide, and IPBC are mixed to form an antibacterial and antifungal active component.

[0049] Subsequently, an interfacial polymerization method was used to coat the antibacterial and antifungal active components with polyurethane prepolymer as the wall material. The reaction temperature was controlled at 55℃ and the reaction time was 4 hours.

[0050] After the reaction was completed, antibacterial and antifungal microcapsules with an average particle size of 5-20 μm were obtained by centrifugation, washing and drying.

[0051] Preparation of foam layer: Weigh out by weight: 100 parts of PVC resin; 60 parts of DOTP plasticizer; 5 parts calcium-zinc stabilizer; 6 parts of AC foaming agent; 1 part zinc oxide activator; Four portions of antibacterial and antifungal microcapsules; 2 parts color paste.

[0052] Add the above raw materials to a high-speed mixer and stir at 1500 r / min for 40 min to obtain foamed slurry.

[0053] Subsequently, degassing was performed for 20 minutes under a vacuum of -0.08 MPa.

[0054] The foaming slurry was coated onto the surface of the polyester knitted base fabric using a doctor blade coating process, with a coating amount of 750 g / m.

[0055] Foaming at 200℃ for 150 seconds forms a foam layer with a thickness of approximately 1.0 mm.

[0056] Surface treatment layer preparation: Weigh out by weight: 100 parts of waterborne polyurethane resin; 1.5 portions of antibacterial and antifungal microcapsules; 0.8 parts leveling agent; 0.5 parts of defoamer; 25 parts deionized water.

[0057] After thorough mixing, a surface treatment solution is obtained.

[0058] The surface treatment liquid was applied evenly to the surface of the foamed layer by spraying, with a spraying amount of 35g / m.

[0059] It is then cured at 130°C for 6 minutes to form a surface treatment layer with a thickness of approximately 40 μm.

[0060] Embossing and shaping: The cured semi-finished product is fed into an embossing device and embossed for 25 seconds at 155℃ and 6MPa. After cooling and shaping, it is rolled up to obtain a long-lasting antibacterial and mildew-resistant artificial leather product.

[0061] Performance testing: 1. Antibacterial performance test The test was conducted in accordance with GB / T 20944.3-2008.

[0062] The results show: The antibacterial rate against Staphylococcus aureus was 99.8%; The antibacterial rate of Escherichia coli was 99.7%.

[0063] 2. Anti-mildew performance test Testing was conducted in accordance with GB / T 24128-2018.

[0064] Cultured for 28 days at a temperature of (282)℃ and a relative humidity of over 95%.

[0065] The results show: No visible mold growth was observed on the sample surface; The mildew resistance level is 0.

[0066] 3. Durability test The sample was tested again after 80 wet scrubbing cycles.

[0067] The antibacterial rate against Staphylococcus aureus remains above 98.5%; The antibacterial rate against Escherichia coli remains above 98.0%; The anti-mildew level should be kept below level 1.

[0068] Test results show that the use of microcapsule sustained-release structure makes the release of antibacterial and antifungal active ingredients more stable, significantly improving the antibacterial and antifungal durability and service life of artificial leather.

[0069] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A long-lasting antibacterial and antifungal artificial leather, characterized in that: It includes a base fabric layer, a foam layer, and a surface treatment layer that are sequentially composited; The foamed layer is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl chloride resin, 40-80 parts of plasticizer, 2-8 parts of stabilizer, 1-10 parts of foaming agent, 0.5-8 parts of antibacterial and antifungal composite agent, and 1-10 parts of additives. The antibacterial and antifungal compound includes a loaded inorganic antibacterial agent and an organic antifungal agent; The supported inorganic antibacterial agent is one or more of the following: silver-loaded zeolite, silver-loaded zirconium phosphate, nano zinc oxide, and nano copper oxide; Organic fungicides are one or more of thiabendazole, isothiazolinone compounds, and IPBC; The surface treatment layer comprises polyurethane resin and an antibacterial and antifungal composite agent, wherein the antibacterial and antifungal composite agent is uniformly dispersed inside the surface treatment layer and partially exposed on the surface of the surface treatment layer.

2. The long-lasting antibacterial and antifungal artificial leather according to claim 1, characterized in that, The supported inorganic antibacterial agent is formed by compounding silver-loaded zeolite, silver-loaded zirconium phosphate and nano zinc oxide in a mass ratio of (1-5):(1-3):(1-5).

3. The long-lasting antibacterial and antifungal artificial leather according to claim 1, characterized in that, The organic antifungal agent is a compound system of thiabendazole and 3-iodo-2-propynyl butylcarbamate (IPBC), with a mass ratio of 1:(0.5-3).

4. The long-lasting antibacterial and antifungal artificial leather according to claim 1, characterized in that, The antibacterial and antifungal composite agent adopts a microcapsule encapsulation structure. The microcapsule wall material is one or more of polyurethane, urea-formaldehyde resin, and melamine-formaldehyde resin, and the microcapsule particle size is 1-50 μm.

5. The long-lasting antibacterial and antifungal artificial leather according to claim 1, characterized in that, The thickness of the foamed layer is 0.3 to 1.5 mm, the thickness of the surface treatment layer is 10 to 100 μm, and the amount of antibacterial and antifungal composite agent added in the foamed layer is 1.5 to 5 times that added in the surface treatment layer.

6. A method for preparing long-lasting antibacterial and mildew-resistant artificial leather, used to manufacture the long-lasting antibacterial and mildew-resistant artificial leather according to any one of claims 1-5, characterized in that, Long-lasting antibacterial and antifungal artificial leather is prepared through the following steps: (1) A foaming slurry is prepared by mixing polyvinyl chloride resin, plasticizer, stabilizer, foaming agent, antibacterial and antifungal composite agent and additives; (2) The foaming slurry is coated on the surface of the base fabric layer and then heated to foam to form a foamed layer; (3) Coat the surface of the foamed layer with a polyurethane treatment liquid containing an antibacterial and antifungal composite agent, and then dry and cure it to form a surface treatment layer; (4) The long-lasting antibacterial and mildew-resistant artificial leather is obtained after embossing, cooling and winding; The antibacterial and antifungal composite agent is synergistically distributed in the foaming layer and the surface treatment layer, so that the resulting artificial leather maintains an antibacterial rate of not less than 99% and an antifungal level of 0 or 1 under long-term use conditions.

7. The method for preparing a long-lasting antibacterial and antifungal artificial leather according to claim 6, characterized in that, The heating and foaming temperature in step (2) is 160-220℃ and the foaming time is 30-300s; the drying and curing temperature in step (3) is 80-150℃ and the curing time is 1-10min.

8. The method for preparing a long-lasting antibacterial and antifungal artificial leather according to claim 6, characterized in that, The antibacterial and antifungal composite agent described in step (1) is first dispersed using a high-speed disperser at a speed of 1000-5000 r / min and a dispersion time of 10-60 min, so that the antibacterial and antifungal composite agent is evenly dispersed in the foaming slurry. In step (1), the foamed slurry is coated after vacuum degassing treatment. The degassing vacuum degree is -0.06 to -0.10 MPa, and the degassing time is 5 to 30 min.

9. The method for preparing a long-lasting antibacterial and antifungal artificial leather according to claim 6, characterized in that, In step (2), the foaming slurry is applied to the surface of the base fabric layer by a scraper coating method. The coating amount is 300-1200 g / m and the coating thickness is 0.3-2.0 mm.

10. The method for preparing a long-lasting antibacterial and antifungal artificial leather according to claim 6, characterized in that, The polyurethane treatment liquid in step (3) is applied to the surface of the foam layer by two-roll coating, three-roll coating or spraying. The mass percentage of antibacterial and antifungal composite agent in the treatment liquid is 0.1% to 10%. In step (4), the embossing temperature is 120-180℃, the embossing pressure is 2-10MPa, the embossing time is 5-60s, and the long-lasting antibacterial and mildew-resistant artificial leather is obtained after embossing and cooling.

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