Preparation method of dust-filtering breathable anti-static fabric

Abstract

The invention relates to the technical field of fabrics, and discloses a preparation method of a dust-filtering breathable antistatic fabric, which comprises the following steps: preparation of a coating liquid, preparation of modified fibers, preparation of a basic fabric, dipping modification, and coating film formation. Polyvinylidene fluoride and polyethylene glycol are utilized to prepare a coating liquid, the coating liquid is coated on the surface of the fabric to form a film, and the film contains a large number of micropores, so that the fabric has excellent air permeability and moisture permeability. In addition, the film is low in surface tension and cannot adhere sundries and tiny dust, tiny holes of the film can prevent the tiny dust from passing through, and the dust filtering performance is excellent. In addition, molybdenum disulfide is added into fabric fibers, a conductive network is formed in the material, electrostatic charges can be quickly dispersed and conducted, accordingly, static accumulation is effectively prevented, meanwhile, the fabric is impregnated with the anti-static auxiliaries, and the fabric has the excellent anti-static performance. The prepared fabric has the advantages of being excellent in dust filtration performance and antistatic performance, breathable, moisture permeable, comfortable to wear and free of stuffiness.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and in particular to a method for preparing a dust-filtering, breathable and anti-static fabric. Background Art

[0002] Anti-static dust-free clothing, also known as clean clothing, is currently widely used in medicine, microelectronics, precision instruments, precision machinery, food industry, life engineering, fine chemicals and other industries. Clean clothing not only requires that the clothing itself should not be a dust source, but also has a certain filtering effect on the dust generated by the internal clothing and the human skin. In addition, clean clothing has another important function, which is to prevent the human body from generating static electricity when working as much as possible. Clean clothing should also meet the requirements of human comfort as much as possible to adapt to the needs of exercise, movement, and physiological and psychological needs when wearing. Most of the clean clothing currently used by enterprises is made by increasing the weaving density or laminating PTFE on the fabric to minimize the porosity of the fabric. Not only is the product cost high and the feel is poor, but also due to the poor air permeability and moisture permeability, it is very stuffy when worn, which greatly affects the comfort of the wearer.

[0003] PVDF is a homopolymer of vinylidene fluoride. It has good mechanical strength and radiation resistance, and its easy processing performance is unmatched by PTFE membrane. Since PVDF is easy to make into porous materials, it can be used as piezoelectric membranes, distillation membranes, etc., and has become an emerging material in the membrane field.

[0004] Molybdenum disulfide (MoS 2 ) is an important transition metal sulfide with a typical layered structure and a wide range of uses. Due to the large relaxation between each layer of atoms in the lattice structure of molybdenum disulfide, it has very good electrical conductivity. When molybdenum disulfide is added to the material, a conductive network can be formed, which helps to quickly disperse and conduct static charges, thereby effectively preventing static electricity accumulation; and molybdenum disulfide also has antimagnetic properties, so when wearing anti-static clothing in certain environments with severe electromagnetic interference, the anti-static clothing is not easily affected by electromagnetic interference and its anti-static performance is affected, thereby improving the applicability of anti-static clothing. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the present invention aims to provide a method for preparing a dust-filtering, breathable and anti-static fabric. The prepared fabric has excellent dust-filtering and anti-static properties, is breathable and moisture-permeable, and is comfortable to wear without being stuffy.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for preparing a dust-filtering, breathable, anti-static fabric comprises the following steps:

[0008] S1. Stir polyvinylidene fluoride, dimethylacetamide and additives in a constant temperature water bath at 70-90° C. until completely clarified, and then stand at 50° C. for degassing to obtain a coating liquid;

[0009] S2, PET resin, polybenzimidazole fiber, antistatic agent, silicone softener and molybdenum disulfide powder are uniformly mixed, and then extruded and granulated by a twin-screw extruder, and then melt-spinned to obtain modified fiber;

[0010] S3, mixing the modified fiber and the polyester fiber to obtain a basic fabric;

[0011] S4, adding an antistatic additive and a surfactant into water, stirring evenly to obtain an impregnation solution, then impregnating the base fabric three times, and then baking at 160° C. for 2 min to obtain a modified fabric;

[0012] S5. Fix the modified fabric on a glass plate, pour the coating liquid on the surface of the fabric, quickly apply it with a stainless steel roller, pre-evaporate it for 1-2 hours, place it in a coagulation bath to form a film, then rinse and immerse it in clean water for 24 hours to obtain a dust-filtering, breathable and anti-static fabric.

[0013] Preferably, the additive is polyethylene glycol.

[0014] Preferably, the mass ratio of the polyvinylidene fluoride, dimethylacetamide and additive is 1.2-2.4:10-20:0.03-0.06.

[0015] Preferably, the molybdenum disulfide powder has a particle size of 1.5-3 μm.

[0016] Preferably, the mass ratio of the PET resin, the polyoxymethylene fiber, the antistatic agent, the silicone softener and the molybdenum disulfide powder is 70-90:20-30:8-10:0.5-1.5:3-5.

[0017] Preferably, the mass ratio of the modified fiber to the polyester fiber is 1:2-3.

[0018] Preferably, the surfactant is one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and alkyl alcohol amide polyoxyethylene ether.

[0019] Preferably, the antistatic auxiliary agent comprises a core-shell type waterborne polyurethane / acrylate composite emulsion and a film-forming agent.

[0020] Preferably, the film-forming agent is one of epoxy dicyclopentadiene epoxy, cyanuric acid epoxy, ethylene glycol and acrylic acid.

[0021] Preferably, the immersion time of the padding is 45-55 minutes, and the rolling rate is controlled at 70-80%.

[0022] Beneficial effects of the present invention:

[0023] In the present invention, polyvinylidene fluoride (PVDF) is prepared into a coating liquid and applied to the surface of the fabric to form a film. After the PVDF coating enters the coagulation bath, it condenses in the coagulation bath, and the solid PVDF shrinks after dehydration, so that micropores filled with solvent are generated in the film. In the subsequent washing and drying process, the solvent is removed, leaving the micropores, so that the fabric has excellent air permeability and moisture permeability. In addition, the film has low surface tension, will not adhere to debris and dust, and its tiny pores will also hinder the passage of dust, and has excellent dust filtration performance.

[0024] The present invention adds polyethylene glycol (PEG) as an additive to the coating liquid. PEG is a hydrophilic polymer that affects the exchange rate between the solvent and the non-solvent during the film-forming process, changes the structure of the membrane, and increases the connectivity between the microporous membrane pores and the porosity of the membrane, further improving the air permeability and moisture permeability of the fabric.

[0025] The present invention adds molybdenum disulfide to the fabric fiber. Molybdenum disulfide has a typical layered structure and has very good conductivity. When molybdenum disulfide is added to the material, a conductive network can be formed, which helps to quickly disperse and conduct static charges, thereby effectively preventing static electricity accumulation. In addition, antistatic additives are impregnated to make the fabric have excellent antistatic properties. DETAILED DESCRIPTION

[0026] The concept and technical effects of the present invention will be clearly and completely described below in conjunction with embodiments to fully understand the purpose, features and effects of the present invention.

[0027] Embodiment 1:

[0028] A method for preparing a dust-filtering, breathable, anti-static fabric comprises the following steps:

[0029] S1. Stir polyvinylidene fluoride, dimethylacetamide and polyethylene glycol in a mass ratio of 1.2:10:0.03 in a constant temperature water bath at 70°C until completely clarified, and then stand at 50°C for degassing to obtain a coating liquid;

[0030] S2, PET resin, polybenzimidazole fiber, antistatic agent, silicone softener and molybdenum disulfide powder are uniformly mixed in a mass ratio of 70:20:8:0.5:3, and then extruded into granules through a twin-screw extruder, and then melt-spinning is performed to obtain modified fibers;

[0031] S3, mixing the modified fiber and the polyester fiber in a mass ratio of 1:2 to obtain a basic fabric;

[0032] S4, adding core-shell waterborne polyurethane / acrylate composite emulsion, epoxy dicyclopentadiene epoxy and polyoxyethylene alkylphenol ether into water, stirring evenly to obtain an impregnation solution, and then padding the base fabric three times, the padding time is 45 minutes, the rolling rate is controlled at 70%, and then baking at 160° C. for 2 minutes to obtain a modified fabric;

[0033] S5. Fix the modified fabric on a glass plate, pour the coating liquid on the surface of the fabric, quickly apply it with a stainless steel roller, pre-evaporate it for 1 hour, place it in a coagulation bath to form a film, then rinse and immerse it in clean water for 24 hours to obtain a dust-filtering, breathable and anti-static fabric.

[0034] Embodiment 2:

[0035] A method for preparing a dust-filtering, breathable, anti-static fabric comprises the following steps:

[0036] S1. Stir polyvinylidene fluoride, dimethylacetamide and polyethylene glycol in a mass ratio of 1.8:20:0.06 in a constant temperature water bath at 80°C until completely clarified, and then stand at 50°C for degassing to obtain a coating liquid;

[0037] S2, PET resin, polybenzimidazole fiber, antistatic agent, silicone softener and molybdenum disulfide powder are uniformly mixed in a mass ratio of 80:20:10:1.5:5, and then extruded into granules through a twin-screw extruder, and then melt-spinning is performed to obtain modified fibers;

[0038] S3, mixing the modified fiber and the polyester fiber in a mass ratio of 1:3 to obtain a basic fabric;

[0039] S4, adding core-shell waterborne polyurethane / acrylate composite emulsion, cyanuric acid epoxy and polyoxyethylene fatty alcohol ether into water, stirring evenly to obtain an impregnation solution, and then padding the base fabric three times, the padding time is 55 minutes, the rolling rate is controlled at 75%, and then baking at 160° C. for 2 minutes to obtain a modified fabric;

[0040] S5. Fix the modified fabric on a glass plate, pour the coating liquid on the surface of the fabric, quickly apply it with a stainless steel roller, pre-evaporate it for 1.5 hours, place it in a coagulation bath to form a film, then rinse and immerse it in clean water for 24 hours to obtain a dust-filtering, breathable and anti-static fabric.

[0041] Embodiment 3:

[0042] A method for preparing a dust-filtering, breathable, anti-static fabric comprises the following steps:

[0043] S1. Stir polyvinylidene fluoride, dimethylacetamide and polyethylene glycol in a mass ratio of 2.4:10:0.06 in a constant temperature water bath at 90°C until completely clarified, and then stand at 50°C for degassing to obtain a coating liquid;

[0044] S2, PET resin, polybenzimidazole fiber, antistatic agent, silicone softener and molybdenum disulfide powder are uniformly mixed in a mass ratio of 90:20:8:0.5:4, and then extruded into granules through a twin-screw extruder, and then melt-spinning was performed to obtain modified fibers;

[0045] S3, mixing the modified fiber and the polyester fiber in a mass ratio of 1:2-3 to obtain a basic fabric;

[0046] S4, adding core-shell waterborne polyurethane / acrylate composite emulsion, ethylene glycol, acrylic acid and alkyl alcohol amide polyoxyethylene ether into water, stirring evenly to obtain an impregnation solution, and then padding the base fabric three times, the padding time is 55 minutes, the rolling rate is controlled at 80%, and then baking at 160° C. for 2 minutes to obtain a modified fabric;

[0047] S5. Fix the modified fabric on a glass plate, pour the coating liquid on the surface of the fabric, quickly apply it with a stainless steel roller, pre-evaporate it for 2 hours, place it in a coagulation bath to form a film, then rinse and immerse it in clean water for 24 hours to obtain a dust-filtering, breathable and anti-static fabric.

[0048] Comparative Example 1:

[0049] The difference between this comparative example and Example 1 is that PVDF is not added, and the other raw materials and steps are the same as those in Example 1.

[0050] Comparative Example 2:

[0051] The difference between this comparative example and Example 1 is that PEG is not added, and the other raw materials and steps are the same as those in Example 1.

[0052] Comparative Example 3:

[0053] The difference between this comparative example and Example 1 is that molybdenum disulfide is not added, and the remaining raw materials and steps are the same as those in Example 1.

[0054] Fabric performance test:

[0055] Dust filtering property: tested in accordance with IESTR P-00003.3 "Elements of Clothing for Clean Rooms and Other Controlled Environments"; air permeability: tested in accordance with GB 5453-1997 "Determination of Air Permeability of Textile Fabrics"; moisture permeability: tested in accordance with GB / T 12704-91; antistatic property: tested in accordance with method B of GB / T 12703-1991 "Test Method for Static Electricity of Textiles".

[0056] Table 1. Performance test of each sample

[0057]

[0058]

[0059] As can be seen from Table 1, Example 1 has better dust filtration than Comparative Example 1. This is because PVDF is used to form a film in Example 1. In addition, the film has low surface tension and will not adhere to foreign dust. Its tiny pores will also hinder the passage of dust, and the dust filtration performance is excellent. Example 1 has higher moisture permeability and air permeability than Comparative Example 2. This is because polyethylene glycol is added in Example 1, which affects the exchange rate between solvent and non-solvent during the film formation process, changes the structure of the film, and increases the connectivity between microporous film pores and the porosity of the film, further improving the air permeability and moisture permeability of the fabric. Example 1 has a lower friction voltage than Comparative Example 3. This is because molybdenum disulfide is added in Example 1. Molybdenum disulfide has a typical layered structure and has very good electrical conductivity. It forms a conductive network in the material, which helps to quickly disperse and conduct static charges, thereby effectively preventing static electricity accumulation and making the fabric have excellent antistatic properties.

[0060] The above embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work shall all fall within the scope of protection of the present invention.

Claims

1. A method for preparing a dust-filtering, breathable, anti-static fabric, characterized in that: The steps include: S1. Stir polyvinylidene fluoride, dimethylacetamide and additives in a constant temperature water bath at 70-90° C. until completely clarified, and then stand at 50° C. for degassing to obtain a coating liquid; S2, PET resin, polybenzimidazole fiber, antistatic agent, silicone softener and molybdenum disulfide powder are uniformly mixed, and then extruded and granulated by a twin-screw extruder, and then melt-spinned to obtain modified fiber; S3, mixing the modified fiber and the polyester fiber to obtain a basic fabric; S4, adding an antistatic additive and a surfactant into water, stirring evenly to obtain an impregnation solution, then impregnating the base fabric three times, and then baking at 160° C. for 2 min to obtain a modified fabric; S5. Fix the modified fabric on a glass plate, pour the coating liquid on the surface of the fabric, quickly apply it with a stainless steel roller, pre-evaporate it for 1-2 hours, place it in a coagulation bath to form a film, then rinse and immerse it in clean water for 24 hours to obtain a dust-filtering, breathable and anti-static fabric.

2. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The additive is polyethylene glycol.

3. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The mass ratio of the polyvinylidene fluoride, dimethylacetamide and additive is 1.2-2.4:10-20:0.03-0.

06.

4. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The particle size of the molybdenum disulfide powder is 1.5-3 μm.

5. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The mass ratio of the PET resin, the polyoxymethylene fiber, the antistatic agent, the silicone softener and the molybdenum disulfide powder is 70-90:20-30:8-10:0.5-1.5:3-5.

6. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The mass ratio of the modified fiber to the polyester fiber is 1:2-3.

7. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The surfactant is one of polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether and alkyl alcohol amide polyoxyethylene ether.

8. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The antistatic auxiliary agent comprises a core-shell type waterborne polyurethane / acrylate composite emulsion and a film-forming agent.

9. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 8, characterized in that: The film former is one of epoxy dicyclopentadiene epoxy, cyanuric acid epoxy, ethylene glycol and acrylic acid.

10. The method for preparing a dust-filtering, breathable, antistatic fabric according to claim 1, characterized in that: The immersion time of the padding is 45-55 minutes, and the rolling rate is controlled at 70-80%.

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