阅读说明：本技术 一种聚四氟乙烯口罩纤维面层的制备方法 (Preparation method of polytetrafluoroethylene mask fiber surface layer ) 是由 黄磊 徐汀 孙玲玲 于 2020-05-13 设计创作，主要内容包括：本发明提供了一种聚四氟乙烯口罩纤维面层的制备方法,其包括如下步骤：将氧化石墨烯、聚乙烯醇和氧化银加入N,N’-二甲基甲酰胺和丙酮的混合溶剂中,搅拌后超声,得到氧化石墨烯分散液；将聚四氟乙烯粉料加入到所述氧化石墨烯分散液中,分散均匀后,得到纺丝液；将所述纺丝液进行静电纺丝,得到初生纤维膜；将所述初生纤维膜进行热处理,得到聚四氟乙烯纳米纤维；将所述聚四氟乙烯纳米纤维分散于聚维酮水溶液中,得到前驱液；将所述前驱液旋涂于熔喷布的表面,固化后,得到所述聚四氟乙烯纤维口罩面层材料。本发明具有如下的有益效果：氧化石墨烯和氧化银协同作用,提高了杀菌消毒的效果,有利于对病毒的隔离；可在消毒液中浸泡后,反复使用。(The invention provides a preparation method of a polytetrafluoroethylene mask fiber surface layer, which comprises the following steps: adding graphene oxide, polyvinyl alcohol and silver oxide into a mixed solvent of N, N' -dimethylformamide and acetone, stirring and then carrying out ultrasonic treatment to obtain a graphene oxide dispersion liquid; adding polytetrafluoroethylene powder into the graphene oxide dispersion liquid, and uniformly dispersing to obtain a spinning solution; performing electrostatic spinning on the spinning solution to obtain a nascent fiber membrane; carrying out heat treatment on the nascent fiber membrane to obtain polytetrafluoroethylene nanofiber; dispersing the polytetrafluoroethylene nano-fibers in a povidone aqueous solution to obtain a precursor solution; and spin-coating the precursor solution on the surface of the melt-blown cloth, and curing to obtain the polytetrafluoroethylene fiber mask surface layer material. The invention has the following beneficial effects: the graphene oxide and the silver oxide have synergistic effect, so that the sterilization and disinfection effects are improved, and the isolation of viruses is facilitated; can be repeatedly used after being soaked in disinfectant.)

1. A preparation method of a polytetrafluoroethylene mask fiber surface layer is characterized by comprising the following steps:

adding graphene oxide, polyvinyl alcohol and silver oxide into a mixed solvent of N, N' -dimethylformamide and acetone, stirring and then carrying out ultrasonic treatment to obtain a graphene oxide dispersion liquid;

adding polytetrafluoroethylene powder into the graphene oxide dispersion liquid, and uniformly dispersing to obtain a spinning solution;

performing electrostatic spinning on the spinning solution to obtain a nascent fiber membrane;

carrying out heat treatment on the nascent fiber membrane at 300-350 ℃ to obtain polytetrafluoroethylene nanofiber immobilized with graphene oxide and silver oxide;

dispersing the polytetrafluoroethylene nano-fibers in a povidone aqueous solution to obtain a precursor solution;

and spin-coating the precursor solution on the surface of the melt-blown cloth, and curing to obtain the polytetrafluoroethylene fiber mask surface layer material.

2. The method for preparing a polytetrafluoroethylene mask fiber facing layer according to claim 1, wherein the mass ratio of the graphene oxide to the silver oxide is 1: (3-8).

3. The method of preparing a fiber facing layer for a polytetrafluoroethylene mask according to claim 2, wherein the method of preparing graphene oxide is Hummers method.

4. The method for preparing a fiber facing layer of a polytetrafluoroethylene mask according to claim 1, wherein the amount of polytetrafluoroethylene is 3 to 5 times the weight of graphene oxide.

5. The method for preparing a fiber surface layer of a polytetrafluoroethylene mask according to claim 1 or 5, wherein the polytetrafluoroethylene has a number average molecular weight of 50000 to 80000.

6. The method of making a fibrous facing layer for a polytetrafluoroethylene mask as defined in claim 1, wherein said electrospinning is carried out under the conditions of: the voltage is 10-25 kV, the distance between the spinning nozzle and the receiving disc is 10-20 cm, and the extrusion speed is 1-5 mu L/min.

7. The method for preparing a fiber face layer of a polytetrafluoroethylene mask according to claim 1, wherein the rate of temperature rise of the heat treatment is 2 to 5 ℃/min.

Technical Field

The invention relates to a preparation method of a polytetrafluoroethylene mask fiber surface layer, and belongs to the technical field of medical epidemic prevention articles.

Background

In daily life, particularly in hospitals, in order to prevent healthy people from infecting germs and increase the chance of cross infection among patients, the prevention is usually carried out by wearing a mask, particularly in the period of novel coronavirus pneumonia epidemic, and in order to prevent the spread of viruses, all people are required to wear the mask in public places, so the demand of the mask is increased rapidly, and particularly, the mask with good filtering and antibacterial effects, such as a disposable medical mask, and the like;

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a preparation method of a polytetrafluoroethylene mask fiber surface layer.

The invention is realized by the following technical scheme:

a preparation method of a polytetrafluoroethylene mask fiber surface layer comprises the following steps:

adding graphene oxide, polyvinyl alcohol and silver oxide into a mixed solvent of N, N' -dimethylformamide and acetone, stirring and then carrying out ultrasonic treatment to obtain a graphene oxide dispersion liquid;

adding polytetrafluoroethylene powder into the graphene oxide dispersion liquid, and uniformly dispersing to obtain a spinning solution;

performing electrostatic spinning on the spinning solution to obtain a nascent fiber membrane;

carrying out heat treatment on the nascent fiber membrane at 300-350 ℃ to obtain polytetrafluoroethylene nanofiber immobilized with graphene oxide and silver oxide;

dispersing the polytetrafluoroethylene nano-fibers in a povidone aqueous solution to obtain a precursor solution;

and spin-coating the precursor solution on the surface of the melt-blown cloth, and curing to obtain the polytetrafluoroethylene mask gasket material.

Preferably, the mass ratio of the graphene oxide to the silver oxide is 1: (3-8).

Preferably, the preparation method of the graphene oxide is Hummers method.

Preferably, the amount of the polytetrafluoroethylene is 3-5 times of the weight of the graphene oxide.

Preferably, the polytetrafluoroethylene has a number average molecular weight of 50000-80000.

Preferably, the electrospinning conditions are as follows: the voltage is 10-25 kV, the distance between the spinning nozzle and the receiving disc is 10-20 cm, and the extrusion speed is 1-5 mu L/min.

Preferably, the heating rate of the heat treatment is 2-5 ℃/min.

Compared with the prior art, the invention has the following beneficial effects:

1. the polytetrafluoroethylene nanofiber carrying the graphene oxide and the silver oxide is attached and fixed on the surface of the melt-blown cloth, so that the melt-blown cloth is reinforced, and the problem that the mask surface layer material is not durable is solved;

2. the graphene oxide and the silver oxide have synergistic effect, so that the sterilization and disinfection effects are improved, and the isolation of viruses is facilitated;

3. the mask surface material can be repeatedly used after being soaked in disinfectant.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.