CN112140650A - Medical protective clothing composite non-woven fabric material capable of being washed repeatedly and preparation method thereof - Google Patents

Medical protective clothing composite non-woven fabric material capable of being washed repeatedly and preparation method thereof Download PDF

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Publication number
CN112140650A
CN112140650A CN202011016015.9A CN202011016015A CN112140650A CN 112140650 A CN112140650 A CN 112140650A CN 202011016015 A CN202011016015 A CN 202011016015A CN 112140650 A CN112140650 A CN 112140650A
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woven fabric
protective clothing
medical protective
material capable
fabric material
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曾军堂
陈庆
司文彬
白涛
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Chengdu New Keli Chemical Science Co Ltd
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Chengdu New Keli Chemical Science Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/022—Non-woven fabric
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/02—Layered materials
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/10—Impermeable to liquids, e.g. waterproof; Liquid-repellent
    • A41D31/102—Waterproof and breathable
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/18—Elastic
    • A41D31/185—Elastic using layered materials
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/30—Antimicrobial, e.g. antibacterial
    • A41D31/305—Antimicrobial, e.g. antibacterial using layered materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/08—Impregnating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/20—All layers being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0253—Polyolefin fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

The invention relates to the field of medical materials, and discloses a medical protective clothing composite non-woven fabric material capable of being washed repeatedly and a preparation method thereof. The preparation method comprises the following preparation processes: (1) soaking the non-woven fabric in a spinning-bonding method into slurry prepared from polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain a pre-impregnated non-woven fabric; (2) clamping the electret treated polypropylene melt-blown fabric sprayed with the polytetrafluoroethylene emulsion between two layers of pre-impregnated non-woven fabrics, and rolling to obtain a pre-laminated object; (3) and spraying polyurethane prepolymer on two sides of the pre-paste, performing hot roller reaction for shaping, cooling and coiling to obtain the repeatedly washable medical protective clothing composite non-woven fabric material. According to the invention, the polyester polyol immersed in the non-woven fabric reacts with the polyurethane prepolymer for micro-foaming, and forms a flexible and elastic protective layer with micropores together with the polytetrafluoroethylene emulsion, so that good air permeability and waterproofness are ensured, and the requirements of repeated use for medical protective clothing can be met.

Description

Medical protective clothing composite non-woven fabric material capable of being washed repeatedly and preparation method thereof
Technical Field
The invention relates to the field of medical materials, and discloses a medical protective clothing composite non-woven fabric material capable of being washed repeatedly and a preparation method thereof.
Background
Medical personnel often come into contact with blood, body fluids, secretions and the like of patients containing viruses during contact with the patient, surgery, therapeutic activities, and the like, thereby presenting an increased risk of infection. Therefore, medical protective clothing becomes a daily necessary consumable for medical personnel. The medical protective clothing refers to protective clothing used by medical staff (doctors, nurses, public health staff, cleaning staff and the like) and people entering specific medical and health areas (such as patients, hospital visitors, staff entering infected areas and the like), and has the functions of isolating germs, harmful ultrafine dust, acid-base solution, electromagnetic radiation and the like, ensuring the safety of the staff and keeping the environment clean.
In order to prevent harmful substances from entering the human body and to ensure the comfort of the human body, medical protective clothing is required to maintain good moisture permeability and barrier property. The common fabric is poor in the aspect of liquid permeation resistance, and the purpose of medical protection is difficult to achieve. In order to meet the standard requirements of technical requirements of medical disposable protective clothing (GB 19082-2009), research on protective clothing at present mainly focuses on material selection and post-processing. For example, the medical protective clothing with high barrier property can be obtained by carrying out multilayer compounding, hydrophobic coating finishing and the like on the fabric. Most of the prior protective clothing fabrics are treated by coating finishing the fabrics by adopting wet or dry polyurethane, polyacrylate and polyvinylidene fluoride as coatings, and then the fabrics are used for manufacturing protective clothing. However, after the conventional fabric coating treatment, the hydrophobic barrier effect of the coating is reduced after washing for several times, and the coating needs to be discarded, thereby causing great waste. Therefore, the research for improving the hydrophobic performance of the medical protective clothing is receiving attention.
The non-woven fabric is a low-cost fabric and has a huge application prospect in the field of medical protective clothing. The common PP non-woven fabric can be made into a breathable and dustproof protective clothing which is widely applied to electronic factories, breeding factories and food factories; the requirements of the medical protective clothing can be met by carrying out hydrophobic treatment on the non-woven fabric, particularly along with the refinement and perfection of fiber of a melt-blown fabric technology and the improvement of the SMS non-woven fabric protective clothing, the non-woven fabric is more suitable as the medical protective clothing, and the batch stable supply can be realized. Through research, SMS non-woven fabrics with better barrier property are required to be used as fabrics of protective clothing in infection wards, sterile surgical operating rooms and the like of hospitals at present.
The Chinese patent application No. 200610025294.9 discloses a special medical protective clothing fabric, which comprises an isolation layer, a protective fabric layer and a protective layer which are bonded with each other in sequence from outside to inside, wherein the isolation layer is a polyurethane film compounded on the upper surface of the protective fabric layer; the protective fabric layer is a polypropylene fiber fabric; the protective layer is a polytetrafluoroethylene film, and the protective layer and the protective fabric layer are bonded through bonding points.
The Chinese patent application No. 202010255680.7 discloses a high-moisture-absorption intelligent heat-dissipation medical protective clothing composite fabric and a preparation method thereof, the composite fabric comprises a non-woven fabric base layer and a moisture-absorption heat-dissipation functional layer compounded on the inner side of the non-woven fabric base layer, wherein the moisture-absorption heat-dissipation functional layer adopts a sandwich laminated structure and comprises a bonding layer, a super-absorption water-retention fiber functional layer and a hydrophilic layer which are sequentially laminated and compounded on the surface of the non-woven fabric base layer; the functional layer of the super absorbent water-retention fiber is loaded with an antibacterial and antiviral compound.
According to the technical problem, the non-woven fabric material for the medical protective clothing is made of non-woven fabrics, disordered fiber holes of the non-woven fabric material are easy to deform when being torn, the non-woven fabric is basically disposable and cannot be used after being washed and disinfected, and waste is greatly caused.
Disclosure of Invention
At present, the widely-applied non-woven fabric for medical protective clothing is basically disposable and cannot be reused after being washed and disinfected, so that great waste is caused, and the application of the non-woven fabric in the medical protective clothing is restricted.
The invention solves the problems through the following technical scheme:
a method for preparing medical protective clothing composite non-woven fabric material capable of being washed repeatedly comprises the following specific steps:
(1) firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material;
(3) and (3) firstly, spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping by a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed.
The polyester polyol is a main raw material of the polyester polyurethane, can be divided into aliphatic polyol and aromatic polyol according to whether benzene rings are contained or not, selects the aromatic polyester polyol, effectively controls the acid value and the hydroxyl value of the polyester polyol, has excellent hydrolysis resistance, heat resistance and adhesiveness, can be used for preparing hard polyurethane foam materials, and has the advantages of fine and smooth foam, good toughness, excellent flame retardant property and low cost. In the present invention, the polyester polyol in the step (1) preferably has an acid value of 1.0mgKOH/g or less and a hydroxyl value of 50 to 70 mgKOH/g. As a further preferred mode of the invention, the polyester polyol is STEPANPOL PDP-70 provided by Shenzhen Jia DEDA new material science and technology Limited.
The antibacterial agent is added into the slurry and then used for the medical protective fabric, so that the medical protective fabric is beneficial to realizing sterilization and improving the antibacterial property and the use safety of the medical protective fabric. Preferably, the antibacterial agent in step (1) is at least one of commercially available nano silver and nano silver supported substance.
The nano microporous tourmaline has larger specific surface area, has the characteristics of spontaneously generating negative oxygen ions, far infrared radiation and the like, and can endow the fabric with certain sterilization property when being used for medical protective fabric. Preferably, the tourmaline of step (1) is tourmaline powder with nanometer micropores.
Preferably, in the step (1), the catalyst is at least one of stannous octoate and di-n-butyltin diacetate.
Preferably, the chain extender in the step (1) is 1, 4-butanediol.
Preferably, in the present invention, the foaming agent in step (1) is water.
Preferably, in the slurry in the step (1), the raw materials comprise, by weight, 80-85 parts of polyester polyol, 0.5-0.8 part of antibacterial agent, 1-3 parts of tourmaline, 0.05-0.1 part of catalyst, 8-10 parts of chain extender and 0.5-0.8 part of foaming agent.
The invention soaks the non-woven fabric obtained by the spun-bonded method into the slurry prepared by polyester polyol, antibacterial agent, tourmaline, catalyst, chain extender and foaming agent, not only adds the polyester polyol into the non-woven fabric, but also can be further added into the subsequent processThe micro-foaming material is prepared, and the added antibacterial material can improve the antibacterial property and the use safety of the non-woven fabric. Preferably, the gram weight of the non-woven fabric obtained by the spunbonding method in the step (1) is not more than 30-50 g/m2(ii) a The immersion time is 30-60 min.
In order to improve the hydrophobic property of the medical protective fabric, the polytetrafluoroethylene emulsion is sprayed on the upper surface and the lower surface of the polypropylene melt-blown fabric subjected to electret treatment to form a polytetrafluoroethylene microporous membrane; the polytetrafluoroethylene is a high-performance polymer, has excellent hydrophobicity and strong water pressure resistance, and can form a microporous membrane by the polytetrafluoroethylene, so that the formed micropores can smoothly carry out moisture removal and air exhaust; and the micro-pores of the polytetrafluoroethylene membrane are stably controlled in the subsequent process, so that the aim of preventing the immersion of viruses, body fluid and the like can be fulfilled. Preferably, the gram weight of the electret treated polypropylene melt-blown fabric in the step (2) is 15-25 g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 50-60%.
The electret treated polypropylene melt-blown fabric with the surface sprayed with the polytetrafluoroethylene emulsion is clamped between the pre-dipped non-woven fabrics and is pressed by a roller, so that the flat pre-laminated object with the S-M-S structure can be obtained, and the compounding of the polyester polyol system slurry and the pre-coated polytetrafluoroethylene emulsion is realized. Preferably, the pressure of the roller pressing in the step (2) is 0.3-0.5 MPa.
The preparation process is that the micro-foaming layers are attached to the two sides of the melt-blown fabric, the obtained foaming layers can effectively protect the tensile deformation of the melt-blown fabric layer, and the melt-blown fabric layer is fluffy, has large dust holding capacity and has elastic recovery, and can be repeatedly cleaned for use.
According to the invention, polyurethane prepolymer is sprayed on two sides of the flat pre-laminated object with the S-M-S structure, hot roller reaction and shaping are carried out, polyester polyol immersed in the non-woven fabric reacts with the polyurethane prepolymer to obtain a micro-foaming material, and a protective layer which has micropores and is flexible and elastic is formed on the surface of the composite non-woven fabric, so that the deformation of the micropores of the melt-blown fabric during washing can be effectively protected, the micropores can be formed by micro-foaming of the melt-blown fabric, the air permeability and the waterproofness of the finally obtained composite non-woven fabric material are ensured, and the composite non-woven fabric material can be repeatedly used. Preferably, the temperature of the hot roller reaction shaping in the step (3) is 70-80 ℃, the pressure is 0.4-0.6 MPa, and the time is 20-40 min.
The medical protective clothing composite non-woven fabric material capable of being washed repeatedly, which is prepared by the method, has good air permeability and waterproofness and can be used repeatedly. Through tests, the air permeability of the prepared composite non-woven fabric material for the medical protective clothing is 800-850 mm/s before washing, and the air permeability is kept at 820-866 mm/s after washing; the surface of the fabric before and after washing shows no wetting and no small water drops during a moisture resistance test, and is kept at a 5-grade moisture resistance grade; the water seepage resisting hydrostatic pressure before washing is 6.50-6.65 kPa, and the water seepage resisting hydrostatic pressure after washing is kept at 6.45-6.55 kPa.
The invention provides a medical protective clothing composite non-woven fabric material capable of being repeatedly washed and a preparation method thereof, wherein polyester polyol, an antibacterial agent, nano microporous tourmaline, a catalyst, a chain extender and a foaming agent are uniformly dispersed to obtain slurry; soaking the non-woven fabric obtained by a spun-bonded method into the slurry, then pressing by using double rollers, and filtering the redundant slurry to obtain a pre-impregnated non-woven fabric; spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then jointing the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric, clamping the melt-blown fabric between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be smooth and pre-jointed; and spraying polyurethane prepolymer on two sides of the flat pre-paste, then carrying out reaction shaping by a hot roller, cooling and coiling.
The invention provides a medical protective clothing composite non-woven fabric material capable of being washed repeatedly and a preparation method thereof, compared with the prior art, the composite non-woven fabric material has the outstanding characteristics and excellent effects that:
1. provides a method for preparing the medical protective clothing composite non-woven fabric material capable of being repeatedly washed by adopting the reaction of polyester polyol and polyurethane prepolymer for micro-foaming.
2. The non-woven fabric obtained by a spun-bonded method is soaked in a polyester polyol system, then is compounded with the melt-blown fabric precoated with polytetrafluoroethylene emulsion and then is reacted by using a polyurethane prepolymer, the polyester polyol soaked in the non-woven fabric reacts with the polyurethane prepolymer to form a micro-foam, and forms a protective layer with micro-pores and flexibility and elasticity together with a polytetrafluoroethylene emulsion layer, so that the micro-pore deformation of the melt-blown fabric during washing can be effectively protected.
3. The composite non-woven fabric prepared by the invention has good air permeability and waterproofness, and can meet the requirement of repeated use for many times when being used for medical protective clothing.
Drawings
FIG. 1 is a schematic view of a process flow diagram of the preparation method of the present invention; wherein: 1-dispersing the slurry; 2-soaking the non-woven fabric into the slurry; 3-double-roller pressing; 4-spraying tetrafluoroethylene emulsion; 5-pressing and attaching by a roller; 6-spraying polyurethane prepolymer on two sides; 7-hot roller reaction shaping; and 8-coiling.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 0.7mgKOH/g and a hydroxyl value of 58 mgKOH/g; the antibacterial agent is commercially available nano silver; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is stannous octoate; the chain extender is 1, 4-butanediol; the foaming agent is water; the grammage of the nonwoven obtained by the spunbond process was 46g/m2(ii) a The immersion time is 46 min;
the raw materials comprise, by weight, 83 parts of polyester polyol, 0.7 part of antibacterial agent, 2.2 parts of tourmaline, 0.07 part of catalyst, 9.2 parts of chain extender and 0.7 part of foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 19g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion was 56%; the pressure of roller pressing is 0.38 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roll reaction shaping is 76 ℃, the pressure is 0.48MPa, and the time is 28 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 1 are shown in table 1.
Example 2
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 0.6mgKOH/g and a hydroxyl value of 55 mgKOH/g; the antibacterial agent is a nano-silver load; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is di-n-butyltin diacetate; the chain extender is 1, 4-butanediol; the foaming agent is water; the grammage of the nonwoven obtained by the spunbond process was 35g/m2(ii) a The immersion time is 40 min;
the raw materials comprise, by weight, 81 parts of polyester polyol, 0.7 part of antibacterial agent, 2.5 parts of tourmaline, 0.09 part of catalyst, 9.5 parts of chain extender and 0.7 part of foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, and then mixing with the step (1) to obtain the productLaminating the prepreg non-woven fabrics, namely clamping the melt-blown fabric between two layers of prepreg non-woven fabrics, and pressing the two layers of prepreg non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 18g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 52 percent; the pressure of roller pressing is 0.35 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roller reaction shaping is 72 ℃, the pressure is 0.45MPa, and the time is 35 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 2 are shown in table 1.
Example 3
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 0.9mgKOH/g and a hydroxyl value of 65 mgKOH/g; the antibacterial agent is commercially available nano silver; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is di-n-butyltin diacetate; the chain extender is 1, 4-butanediol; the foaming agent is water; the grammage of the nonwoven fabric obtained by the spunbond process was 45g/m2(ii) a The immersion time is 50 min;
the raw materials comprise, by weight, 84 parts of polyester polyol, 0.6 part of antibacterial agent, 1.5 parts of tourmaline, 0.06 part of catalyst, 8.5 parts of chain extender and 0.6 part of foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 22g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 58 percent; roller drumThe pressing pressure is 0.45 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roller reaction shaping is 78 ℃, the pressure is 0.45MPa, and the time is 25 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 3 are shown in table 1.
Example 4
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 0.5mgKOH/g and a hydroxyl value of 50 mgKOH/g; the antibacterial agent is a nano-silver load; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is di-n-butyltin diacetate; the chain extender is 1, 4-butanediol; the foaming agent is water; the gram weight of the non-woven fabric obtained by the spun-bonding method is not more than 30g/m2(ii) a The immersion time is 30 min;
the raw materials comprise, by weight, 80 parts of polyester polyol, 0.8 part of an antibacterial agent, 3 parts of tourmaline, 0.1 part of a catalyst, 10 parts of a chain extender and 0.8 part of a foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 15g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 50 percent; the pressure of roller pressing is 0.3 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roller reaction shaping is 70 ℃, the pressure is 0.4MPa, and the time is 40 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 4 are shown in table 1.
Example 5
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 1.0mgKOH/g and a hydroxyl value of 70 mgKOH/g; the antibacterial agent is commercially available nano silver; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is stannous octoate; the chain extender is 1, 4-butanediol; the foaming agent is water; the gram weight of the non-woven fabric obtained by the spunbonding method is not more than 50g/m 2; the immersion time is 60 min;
the raw materials comprise, by weight, 85 parts of polyester polyol, 0.5 part of antibacterial agent, 1 part of tourmaline, 0.05 part of catalyst, 8 parts of chain extender and 0.5 part of foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 25g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 60 percent; the pressure of roller pressing is 0.5 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roller reaction shaping is 80 ℃, the pressure is 0.6MPa, and the time is 20 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 5 are shown in table 1.
Example 6
(1) Firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric; the polyester polyol has an acid value of 0.8mgKOH/g and a hydroxyl value of 60 mgKOH/g; the antibacterial agent is a nano-silver load; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is di-n-butyltin diacetate; the chain extender is 1, 4-butanediol; the foaming agent is water; the gram weight of the nonwoven fabric obtained by the spunbond process was 40g/m 2; the immersion time is 45 min;
the raw materials comprise, by weight, 82.5 parts of polyester polyol, 0.65 part of antibacterial agent, 2 parts of tourmaline, 0.08 part of catalyst, 9 parts of chain extender and 0.65 part of foaming agent;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material; the gram weight of the electret treated polypropylene melt-blown fabric is 20g/m2(ii) a The solid content of the polytetrafluoroethylene emulsion is 55 percent; the pressure of roller pressing is 0.4 MPa;
(3) spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping through a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed; the temperature of hot roller reaction shaping is 75 ℃, the pressure is 0.5MPa, and the time is 30 min.
The air permeability, surface moisture resistance and hydrostatic water pressure resistance of the composite nonwoven fabric material for medical protective clothing obtained in example 6 are shown in table 1.
Comparative example 1
Comparative example 1 the nonwoven fabric obtained by spunbonding was not pre-impregnated with the polyester polyol slurry, and the composite nonwoven fabric material for medical protective clothing, which had the air permeability, surface moisture resistance and hydrostatic water pressure resistance as shown in table 1, was prepared under the same conditions as in example 6.
The performance index testing method comprises the following steps:
referring to the standard of technical requirements for disposable medical protective clothing (GB 19082-:
(1) and (3) testing air permeability:
refer to Standard operation test of determination of textile Fabric air Permeability (GB/T5453), selecting 20cm2The test head of (1), the pressure difference of 100Pa is tested, the air permeability of the sample before and after washing is tested, and the test result is shown in Table 1;
(2) surface moisture resistance test:
referring to standard operation test of textile fabric surface moisture resistance determination wetting test (GB/T4745-;
(3) and (3) testing the water impermeability:
refer to hydrostatic pressure measurement for water impermeability of textile fabrics (GB/T4744-2O/min), the hydrostatic water pressure resistance of the test samples before and after washing, and the test results are shown in table 1.
As can be seen from table 1: the medical protective clothing nonwoven material prepared by the invention has high air permeability, good moisture resistance and high water seepage resistant hydrostatic pressure, can still maintain good air permeability, moisture resistance and water seepage resistance after repeated washing, and can meet the requirement of repeated use of the medical protective clothing. Comparative example 1, which had no pre-impregnated polyester polyol slurry, did not react to form an elastic microporous protective layer during hot roll treatment, affecting the breathability of the material, and if washed and reused, causing deformation of meltblown micropores and affecting barrier properties.
Table 1:
Figure 925442DEST_PATH_IMAGE002

Claims (10)

1. a method for preparing medical protective clothing composite non-woven fabric material capable of being washed repeatedly is characterized by comprising the following specific steps:
(1) firstly, uniformly dispersing polyester polyol, an antibacterial agent, tourmaline, a catalyst, a chain extender and a foaming agent to obtain slurry, then soaking the non-woven fabric obtained by a spun-bonded method into the slurry, pressing the non-woven fabric by using double rollers, and filtering redundant slurry to obtain pre-impregnated non-woven fabric;
(2) spraying polytetrafluoroethylene emulsion on the upper surface and the lower surface of the electret treated polypropylene melt-blown fabric, then laminating the polypropylene melt-blown fabric with the pre-impregnated non-woven fabric obtained in the step (1) to enable the melt-blown fabric to be sandwiched between two layers of pre-impregnated non-woven fabrics, and pressing the pre-impregnated non-woven fabrics by a roller to be flat and pre-laminated to obtain a flat pre-laminated material;
(3) and (3) firstly, spraying polyurethane prepolymer on two sides of the flat pre-laminated object obtained in the step (2), then carrying out reaction shaping by a hot roller, cooling, and finally coiling to obtain the medical protective clothing composite non-woven fabric material capable of being repeatedly washed.
2. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: the polyester polyol in the step (1) has an acid value of less than or equal to 1.0mgKOH/g and a hydroxyl value of 50-70 mgKOH/g; the antibacterial agent is at least one of commercially available nano silver and nano silver loaded matter; the tourmaline is tourmaline powder with nanometer micropores; the catalyst is at least one of stannous octoate and di-n-butyltin diacetate; the chain extender is 1, 4-butanediol; the foaming agent is water.
3. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: in the slurry in the step (1), the raw materials comprise, by weight, 80-85 parts of polyester polyol, 0.5-0.8 part of antibacterial agent, 1-3 parts of tourmaline, 0.05-0.1 part of catalyst, 8-10 parts of chain extender and 0.5-0.8 part of foaming agent.
4. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: the gram weight of the non-woven fabric obtained by the spun-bonding method in the step (1) is not more than 30-50 g/m2。
5. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: the immersion time in the step (1) is 30-60 min.
6. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: the gram weight of the electret treated polypropylene melt-blown fabric in the step (2) is 15-25 g/m2。
7. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: and (3) the solid content of the polytetrafluoroethylene emulsion in the step (2) is 50-60%.
8. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: and (3) the pressure of the roller pressing in the step (2) is 0.3-0.5 MPa.
9. The preparation method of the medical protective clothing composite non-woven fabric material capable of being washed repeatedly according to claim 1 is characterized in that: and (3) the temperature of the hot roller reaction shaping is 70-80 ℃, the pressure is 0.4-0.6 MPa, and the time is 20-40 min.
10. A re-washable medical protective clothing composite nonwoven fabric material prepared by the method of any one of claims 1 to 9.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112726225A (en) * 2020-12-31 2021-04-30 广西德福莱医疗器械有限公司 High-efficiency filtering melt-blown fabric
CN113829703A (en) * 2021-09-16 2021-12-24 圣华盾防护科技股份有限公司 Reusable non-woven fabric composite fabric and processing technology
CN114293368A (en) * 2021-11-29 2022-04-08 深圳全棉时代科技有限公司 Production method of antibacterial fluffy cotton fiber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112726225A (en) * 2020-12-31 2021-04-30 广西德福莱医疗器械有限公司 High-efficiency filtering melt-blown fabric
CN113829703A (en) * 2021-09-16 2021-12-24 圣华盾防护科技股份有限公司 Reusable non-woven fabric composite fabric and processing technology
CN114293368A (en) * 2021-11-29 2022-04-08 深圳全棉时代科技有限公司 Production method of antibacterial fluffy cotton fiber

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