Waterproof sterile fabric environment-friendly film and preparation method thereof

Abstract

The invention belongs to the technical field of environment-friendly film materials, and provides a waterproof sterile fabric environment-friendly film and a preparation method thereof. The preparation method comprises the following steps: S1, mixing a biodegradable high polymer material, an environment-friendly plasticizer and a solvent to obtain a mixture A; s2, mixing the mixture A, a hydrophobic modifier, an inorganic nano antibacterial agent, a cross-linking agent and an ultraviolet light absorber, and performing melt blending to obtain a mixture B; and S3, preparing the mixture B into a thin film by using a calendering film forming process, and carrying out ultraviolet ray or electron beam irradiation curing to obtain the waterproof sterile fabric environment-friendly film. According to the technical scheme, the environment-friendly property, the water resistance, the antibacterial property, the weather resistance and the processability of the fabric environment-friendly film are remarkably improved, many problems existing in the prior art are solved, and the fabric environment-friendly film has remarkable technical advantages and application value and represents the new technology development trend in the field of fabric materials.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly film materials, and in particular to a waterproof and sterile cloth environmentally friendly film and a preparation method thereof. Background Art

[0002] Fabric eco-friendly film is an environmentally friendly film material used to protect or decorate fabric products. Application scenarios include sofas, curtains, carpets, tablecloths, outdoor clothing and car seats. With the increase of environmental awareness and the increase of consumer demand for functional fabric products, waterproof, antibacterial and environmentally friendly film materials are increasingly widely used in fabric decoration, furniture protection, outdoor textiles and other fields. However, the existing fabric eco-friendly film polymer compositions still have significant technical bottlenecks in terms of waterproof performance, antibacterial effect and environmental protection. First, the waterproof performance is insufficient. Traditional fabric waterproof films mostly rely on hydrophobic coatings (such as polyurethane and polyvinyl chloride), but after long-term use, they are prone to mechanical wear or chemical degradation, resulting in a decrease in waterproof performance, and some coatings contain harmful substances such as fluorocarbon compounds, which do not meet environmental protection requirements. In addition, the poor compatibility of the waterproof agent with the substrate and improper processing technology (such as insufficient baking temperature or inaccurate control of the liquid rate on the cloth surface) will cause micropores or cracks on the surface of the film, further reducing the waterproof effect. Second, it is difficult to balance environmental protection and functionality. Currently, most commercially available environmentally friendly films use degradable materials (such as PBAT and PLA), but their waterproof and antibacterial properties are significantly weaker than traditional petroleum-based materials. For example, although PLA-based films are degradable, their barrier properties and antibacterial activity are insufficient, making it difficult to meet the high standards required for food packaging or medical fabric products. In addition, although some environmentally friendly materials (such as bamboo fiber) are naturally antibacterial, they require chemical modification to achieve waterproofing, which greatly reduces their overall environmental protection. Therefore, it is urgent to develop a new type of polymer composition that can achieve efficient synergy of waterproofing, antibacterial and environmental protection properties through material modification and process innovation to meet the high-end application requirements of fabric products. Summary of the invention

[0003] In view of this, the present invention provides a waterproof and sterile environmentally friendly fabric film and a preparation method thereof, the purpose of which is to solve the technical problems of the existing environmentally friendly fabric films, such as insufficient waterproof performance and difficulty in balancing environmental protection and functionality.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] The present invention provides a waterproof and sterile cloth environmentally friendly film, which comprises the following raw materials by mass percentage:

[0006] Biodegradable polymer material 40-70%, hydrophobic modifier 5-15%, inorganic nano antibacterial agent 3-10%, cross-linking agent 1-5%, environmentally friendly plasticizer 2-8%, ultraviolet absorber 0.5-2%, and the balance is solvent;

[0007] The hydrophobic modifier includes silicone;

[0008] The inorganic nano antibacterial agent includes titanium dioxide nanoparticles loaded with silver ions or zinc oxide nanoparticles loaded with silver ions.

[0009] Furthermore, the biodegradable polymer material includes one or more of polylactic acid, polybutylene succinate and polybutylene adipate-terephthalate.

[0010] Furthermore, the cross-linking agent includes peroxide or isocyanate compounds.

[0011] Furthermore, the environmentally friendly plasticizer includes citrate or epoxidized soybean oil.

[0012] Furthermore, the ultraviolet absorber includes benzotriazole compounds or salicylate compounds.

[0013] Furthermore, the solvent includes one or more of ethanol, acetone, ethyl acetate, dimethyl sulfoxide and water.

[0014] The present invention provides a method for preparing the above-mentioned waterproof and sterile cloth environmentally friendly film, comprising the following steps:

[0015] S1, mixing a biodegradable polymer material, an environmentally friendly plasticizer and a solvent to obtain a mixture A;

[0016] S2, mixing mixture A, a hydrophobic modifier, an inorganic nano antibacterial agent, a crosslinking agent and an ultraviolet absorber and then melt-blending to obtain a mixture B;

[0017] S3. The mixture B is prepared into a film by a calendering film-forming process, and then cured by ultraviolet or electron beam irradiation to obtain a waterproof and sterile environmentally friendly fabric film.

[0018] Furthermore, in step S1, the mixing temperature is 80 to 120° C., and the mixing time is 10 to 60 minutes.

[0019] Furthermore, in step S2, the temperature of melt blending is 160-200° C., and the time of melt blending is 30-120 min.

[0020] Furthermore, in the step S3, the pressure of the calendering film forming process is 5 to 20 MPa; and the radiation dose of the radiation curing is 10 to 50 kGy.

[0021] It can be seen from the above technical solution that compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. Excellent waterproof performance: The present invention significantly improves the waterproof performance of the environmentally friendly fabric film by introducing a hydrophobic modifier (organic silicon). Organic silicon has good hydrophobic properties and can form a dense hydrophobic layer on the surface of the film to effectively prevent water penetration. Compared with traditional fabric materials, the waterproof performance of the present invention is greatly enhanced, suitable for a variety of humid environments, and prolongs the service life of fabric products.

[0023] 2. Highly effective antibacterial effect: The present invention uses inorganic nano antibacterial agents, specifically titanium dioxide nanoparticles loaded with silver ions or zinc oxide nanoparticles loaded with silver ions. Silver ions have a broad-spectrum antibacterial effect and can effectively kill and inhibit the growth of a variety of bacteria and fungi. The introduction of nanoparticles not only improves the dispersibility of the antibacterial agent, but also enhances its binding force with the substrate, thereby making the antibacterial effect lasting and stable. Compared with the organic antibacterial agents used in the prior art, the antibacterial effect of the present invention is more significant and is not easy to develop drug resistance.

[0024] 3. Environmental protection and degradability: The main component of the present invention is biodegradable polymer material. This choice not only conforms to the current environmental protection trend, but also effectively reduces environmental pollution. Traditional fabric materials are difficult to degrade after use and disposal, causing serious white pollution. However, the present invention can be gradually degraded into harmless substances under natural conditions, greatly reducing the environmental burden.

[0025] 4. Excellent physical properties:

[0026] By adding a cross-linking agent and an environmentally friendly plasticizer, the fabric environmentally friendly film of the present invention has good mechanical strength and weather resistance while maintaining softness. The use of the cross-linking agent enhances the cohesion of the film material and improves its tear resistance and tensile strength; the introduction of the environmentally friendly plasticizer enables the film material to maintain good flexibility in a low temperature environment and is not easy to crack.

[0027] 5. Ultraviolet protection function: The invention adds ultraviolet absorber, which effectively blocks the penetration of ultraviolet rays and protects the fabric material from fading and aging caused by ultraviolet radiation. This feature makes the invention particularly suitable for outdoor products and prolongs the service life of the product.

[0028] The present invention achieves an organic combination of multiple properties such as waterproof, antibacterial, environmentally friendly, and weather-resistant by scientifically proportioning multiple functional additives, and provides a fabric environmentally friendly film with excellent comprehensive performance. Compared with products with a single function or unbalanced performance in the prior art, the present invention has achieved technological breakthroughs in many aspects and represents a new technological development trend in the field of fabric materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a test chart of the waterproof performance of the waterproof and sterile environmentally friendly fabric film prepared in Examples 1 to 5. DETAILED DESCRIPTION

[0030] The present invention provides a waterproof and sterile cloth environmentally friendly film, which comprises the following raw materials by mass percentage:

[0031] Biodegradable polymer material 40-70%, hydrophobic modifier 5-15%, inorganic nano antibacterial agent 3-10%, cross-linking agent 1-5%, environmentally friendly plasticizer 2-8%, ultraviolet absorber 0.5-2%, and the balance is solvent;

[0032] In the present invention, the amount of the biodegradable polymer material is preferably 45 to 65%, more preferably 50 to 60%.

[0033] In the present invention, the amount of the hydrophobic modifier used is preferably 10%.

[0034] In the present invention, the dosage of the inorganic nano antibacterial agent is preferably 4-8%, and more preferably 5-7%.

[0035] In the present invention, the amount of the crosslinking agent used is preferably 2 to 4%, more preferably 3%.

[0036] In the present invention, the amount of the environmentally friendly plasticizer is preferably 3 to 7%, and more preferably 4 to 6%.

[0037] In the present invention, the amount of the ultraviolet absorber used is preferably 1 to 1.5%.

[0038] In the present invention, the hydrophobic modifier includes silicone;

[0039] The inorganic nano antibacterial agent includes titanium dioxide nanoparticles loaded with silver ions or zinc oxide nanoparticles loaded with silver ions.

[0040] In the present invention, the biodegradable polymer material includes one or more of polylactic acid, polybutylene succinate and polybutylene adipate-terephthalate.

[0041] In the present invention, the crosslinking agent includes peroxide or isocyanate compounds; the peroxide is preferably diisopropylbenzene peroxide or 2,5-dimethyl-2,5-di-tert-butyl peroxide; the isocyanate compound is preferably hexamethylene diisocyanate, toluene diisocyanate or isophorone diisocyanate.

[0042] In the present invention, the environmentally friendly plasticizer includes citrate or epoxidized soybean oil.

[0043] In the present invention, the ultraviolet absorber includes a benzotriazole compound or a salicylate compound; the benzotriazole compound is preferably one or more of UV-P, UV-326, UV-327 and UV-328; the salicylate compound is preferably one or more of phenyl salicylate, methyl salicylate, isobutyl salicylate and benzyl salicylate.

[0044] In the present invention, the solvent includes one or more of ethanol, acetone, ethyl acetate, dimethyl sulfoxide and water.

[0045] In the present invention, the waterproof and sterile environmentally friendly fabric film is coated or compounded on a fabric product, and the fabric product includes curtains, sofa fabrics or clothing.

[0046] The present invention also provides a method for preparing the above-mentioned waterproof and sterile environmentally friendly fabric film, comprising the following steps:

[0047] S1, mixing a biodegradable polymer material, an environmentally friendly plasticizer and a solvent to obtain a mixture A;

[0048] S2, mixing mixture A, a hydrophobic modifier, an inorganic nano antibacterial agent, a crosslinking agent and an ultraviolet absorber and then melt-blending to obtain a mixture B;

[0049] S3. The mixture B is prepared into a film by a calendering film-forming process, and then cured by ultraviolet or electron beam irradiation to obtain a waterproof and sterile environmentally friendly fabric film.

[0050] In the present invention, in step S1, the mixing temperature is 80-120° C., preferably 90-110° C., and more preferably 100° C.; the mixing time is 10-60 min, preferably 20-50 min, and more preferably 30-40 min.

[0051] In the present invention, in step S2, the temperature of melt blending is 160-200°C, preferably 170-190°C, and more preferably 180°C; the time of melt blending is 30-120 min, preferably 40-100 min, and more preferably 60-80 min.

[0052] In the present invention, in step S3, the pressure of the calendering film forming process is 5-20 MPa, preferably 8-16 MPa, and further 10-14 MPa; the radiation dose of radiation curing is 10-50 kGy, preferably 20-40 kGy, and further preferably 30 kGy.

[0053] In the present invention, the thickness of the waterproof and sterile environmentally friendly fabric film is preferably 0.05 to 0.3 mm.

[0054] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0055] Example 1

[0056] The raw materials used in this embodiment and their amounts are as follows:

[0057] Polylactic acid 50%, silicone 10%, titanium dioxide nanoparticles loaded with silver ions 5%, dicumyl peroxide 3%, citrate 3%, UV-P 1%, and the balance is ethanol;

[0058] Polylactic acid, citrate and ethanol were mixed in proportion, stirred and mixed at 100°C for 30 minutes to obtain mixture A; mixture A was mixed with organosilicon, titanium dioxide nanoparticles loaded with silver ions, diisopropylbenzene peroxide and UV-P in proportion, melt blended at 180°C for 60 minutes to obtain mixture B. Mixture B was heated to a molten state, and calendered into a film with a thickness of 0.1 mm by a calender at 10 MPa, and then cured by electron beam irradiation (30 kGy) to finally obtain a waterproof and sterile fabric environmentally friendly film.

[0059] Example 2

[0060] The raw materials used in this embodiment and their amounts are as follows:

[0061] Polybutylene succinate 40%, silicone 12%, silver ion-loaded titanium dioxide nanoparticles 8%, 2,5-dimethyl-2,5-di-tert-butyl peroxide 1%, citrate 4%, UV-3261%, and the balance is acetone;

[0062] Polybutylene succinate, citrate and acetone were mixed in proportion, stirred and mixed at 80°C for 60 minutes to obtain mixture A; mixture A was mixed with silicone, silver ion-loaded titanium dioxide nanoparticles, 2,5-dimethyl-2,5-di-tert-butyl peroxide and UV-326 in proportion, melt blended at 160°C for 120 minutes to obtain mixture B. Mixture B was heated to a molten state, and calendered into a film with a thickness of 0.1 mm by a calender at 15 MPa, and then cured by electron beam irradiation (20 kGy) to finally obtain a waterproof and sterile fabric environmentally friendly film.

[0063] Example 3

[0064] The raw materials used in this embodiment and their amounts are as follows:

[0065] Polybutylene adipate-terephthalate 60%, silicone 5%, zinc oxide nanoparticles loaded with silver ions 3%, hexamethylene diisocyanate 2%, epoxy soybean oil 5%, phenyl salicylate 1%, and the balance is dimethyl sulfoxide;

[0066] Polybutylene adipate-terephthalate, epoxy soybean oil and dimethyl sulfoxide were mixed in proportion, stirred and mixed at 90°C for 40 minutes to obtain mixture A; mixture A was mixed with silicone, silver ion-loaded zinc oxide nanoparticles, hexamethylene diisocyanate and phenyl salicylate in proportion, melt blended at 170°C for 80 minutes to obtain mixture B. Mixture B was heated to a molten state, and calendered into a film with a thickness of 0.1 mm by a calender at 12 MPa, and then cured by electron beam irradiation (40 kGy) to finally obtain a waterproof and sterile fabric environmentally friendly film.

[0067] Example 4

[0068] The raw materials used in this embodiment and their amounts are as follows:

[0069] Polybutylene succinate 60%, silicone 5%, silver ion-loaded zinc oxide nanoparticles 3%, toluene diisocyanate 2%, epoxy soybean oil 5%, UV-328 1%, and the balance is ethyl acetate;

[0070] Polybutylene succinate, epoxy soybean oil and ethyl acetate were mixed in proportion, stirred and mixed at 110°C for 50 minutes to obtain mixture A; mixture A was mixed with silicone, silver ion-loaded zinc oxide nanoparticles, toluene diisocyanate and UV-328 in proportion, melt blended at 190°C for 40 minutes to obtain mixture B. Mixture B was heated to a molten state, and calendered into a film with a thickness of 0.1 mm by a calender at 16 MPa, and then cured by electron beam irradiation (10 kGy) to finally obtain a waterproof and sterile fabric environmentally friendly film.

[0071] Example 5

[0072] The raw materials used in this embodiment and their amounts are as follows:

[0073] Polylactic acid 70%, silicone 5%, silver ion-loaded zinc oxide nanoparticles 3%, isophorone diisocyanate 5%, epoxy soybean oil 8%, benzyl salicylate 0.8%, and the balance is water;

[0074] Polylactic acid, epoxy soybean oil and water were mixed in proportion, stirred and mixed at 120°C for 20 minutes to obtain mixture A; mixture A was mixed with silicone, silver ion-loaded zinc oxide nanoparticles, isophorone diisocyanate and benzyl salicylate in proportion, melt blended at 200°C for 30 minutes to obtain mixture B. Mixture B was heated to a molten state, and calendered into a film with a thickness of 0.1 mm at 20 MPa by a calender, and then cured by electron beam irradiation (50 kGy) to finally obtain a waterproof and sterile fabric environmentally friendly film.

[0075] Performance Testing

[0076] The waterproof sterile environmentally friendly fabric films prepared in Examples 1 to 5 were tested for antibacterial properties. Antibacterial properties: refer to GB / T21866-2008 test, using Staphylococcus aureus and Escherichia coli as bacterial species, and measuring the antibacterial rate;

[0077] Antibacterial persistence: The antibacterial rate was measured after irradiation with ultraviolet light with a wavelength of 254nm for 100h. The results are shown in Table 1.

[0078] Table 1 Antibacterial properties of waterproof sterile fabric environmentally friendly membrane

[0079]

[0080] As can be seen from Table 1, the waterproof and sterile environmentally friendly fabric film prepared by the present invention has an anti-Staphylococcus aureus property of more than 99.6%, an anti-Staphylococcus aureus persistence of more than 97.9%, an anti-Escherichia coli property of more than 99.7%, and an anti-Escherichia coli persistence of more than 97.8%, which indicate that it has excellent antibacterial properties and persistence.

[0081] The waterproof sterile fabric environmentally friendly films prepared in Examples 1 to 5 were tested for waterproof performance. The test method refers to the standard ASTM F1249-2020. The test results are shown in Figure 1 ,Depend on Figure 1 It can be seen that the water vapor permeability of the waterproof sterile cloth environmentally friendly film prepared by the present invention is very low, indicating that the film has excellent waterproof performance.

[0082] 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 principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A waterproof and sterile environmentally friendly fabric film, characterized in that: Calculated by mass percentage, it includes the following raw materials: Biodegradable polymer material 40-70%, hydrophobic modifier 5-15%, inorganic nano antibacterial agent 3-10%, cross-linking agent 1-5%, environmentally friendly plasticizer 2-8%, ultraviolet absorber 0.5-2%, and the balance is solvent; The hydrophobic modifier includes silicone; The inorganic nano antibacterial agent includes titanium dioxide nanoparticles loaded with silver ions or zinc oxide nanoparticles loaded with silver ions.

2. The waterproof and sterile environmentally friendly fabric film according to claim 1, characterized in that: The biodegradable polymer material includes one or more of polylactic acid, polybutylene succinate and polybutylene adipate-terephthalate.

3. The waterproof and sterile environmentally friendly fabric film according to claim 2, characterized in that: The cross-linking agent includes peroxide or isocyanate compounds.

4. The waterproof and sterile environmentally friendly fabric film according to claim 3, characterized in that: The environmentally friendly plasticizer includes citrate or epoxidized soybean oil.

5. The waterproof and sterile environmentally friendly fabric film according to any one of claims 1 to 4, characterized in that: The ultraviolet absorber includes benzotriazole compounds or salicylate compounds.

6. The waterproof and sterile environmentally friendly fabric film according to claim 5, characterized in that: The solvent includes one or more of ethanol, acetone, ethyl acetate, dimethyl sulfoxide and water.

7. The method for preparing the waterproof and sterile environmentally friendly fabric film according to any one of claims 1 to 6 is characterized in that: The following steps are involved: S1, mixing a biodegradable polymer material, an environmentally friendly plasticizer and a solvent to obtain a mixture A; S2, mixing mixture A, a hydrophobic modifier, an inorganic nano antibacterial agent, a crosslinking agent and an ultraviolet absorber and then melt-blending to obtain a mixture B; S3. The mixture B is prepared into a film by a calendering film-forming process, and then cured by ultraviolet or electron beam irradiation to obtain a waterproof and sterile environmentally friendly fabric film.

8. The preparation method according to claim 7, characterized in that: In the step S1, the mixing temperature is 80-120° C., and the mixing time is 10-60 min.

9. The preparation method according to claim 8, characterized in that: In the step S2, the temperature of melt blending is 160-200°C, and the time of melt blending is 30-120 minutes.

10. The preparation method according to claim 9, characterized in that: In the step S3, the pressure of the calendering film forming process is 5-20 MPa; the radiation dose of the radiation curing is 10-50 kGy.

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