LU504308B1 - Melt-blown medical protective material, its preparation method and application - Google Patents

Melt-blown medical protective material, its preparation method and application Download PDF

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Publication number
LU504308B1
LU504308B1 LU504308A LU504308A LU504308B1 LU 504308 B1 LU504308 B1 LU 504308B1 LU 504308 A LU504308 A LU 504308A LU 504308 A LU504308 A LU 504308A LU 504308 B1 LU504308 B1 LU 504308B1
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Luxembourg
Prior art keywords
melt
blown
preparation
polylactic acid
medical protective
Prior art date
Application number
LU504308A
Other languages
French (fr)
Inventor
Shuxia Duan
Zhengnan Zhang
Ziqi Zheng
Hongfu Pan
Yingkun Fu
Ansheng Wang
Peilong Shi
Chong Tian
Cong Chang
Yongheng Zhou
Heng Zhang
Wu Yang
Original Assignee
Henan Yadu Medical Co Ltd
Univ Zhongyuan Technology
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Application filed by Henan Yadu Medical Co Ltd, Univ Zhongyuan Technology filed Critical Henan Yadu Medical Co Ltd
Priority to LU504308A priority Critical patent/LU504308B1/en
Application granted granted Critical
Publication of LU504308B1 publication Critical patent/LU504308B1/en

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D04H1/56—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple 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
    • 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
    • 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
    • B32B5/06—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 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
    • B32B5/067—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 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper characterised by the fibrous or filamentary layer being mechanically connected by hydroentangling
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B32B5/265—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 characterised by one fibrous or filamentary layer being a non-woven fabric layer
    • B32B5/266—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 characterised by one fibrous or filamentary layer being a non-woven fabric layer next to one or more non-woven fabric layers
    • B32B5/268—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 characterised by one fibrous or filamentary layer being a non-woven fabric layer next to one or more non-woven fabric layers characterised by at least one non-woven fabric layer that is a melt-blown fabric
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
    • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
    • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
    • 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
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • 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
    • 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
    • B32B2262/0276—Polyester fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2262/04—Cellulosic plastic fibres, e.g. rayon
    • 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
    • B32B2262/06—Vegetal fibres
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2307/70—Other properties
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    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • B32B2553/02—Shock absorbing
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    • B32B2571/00—Protective equipment

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

The present invention belongs to the field of melt-blown, hot air and hydroentanglement nonwoven materials and relates to the preparation of ultra-fine fibers, in particular to a melt-blown medical protective material with a cattail vein structure as well as a preparation method and application of the melt-blown medical protective material. The melt-blown medical protective material is of a three-layer fiber structure, the surface layer and the bottom layer are hydrophilic degradable directionally-arranged fiber layers, and the middle layer is a fluffy degradable cellulose fiber layer; the preparation method comprises the following steps: preparing the hydrophilic modified polymer; preparing and netting a directionally arranged fiber layer; drafting and forming the directionally arranged fiber layer; preparing a fluffy degradable cellulose fiber layer; a hydroentanglement reinforcing procedure of the three-layer composite material; finally, the nonwoven composite material which is high in longitudinal strength and capable of achieving horizontal directional diffusion of liquid is formed. The environment-friendly degradable raw materials are adopted, the environment-friendly preparation method is also adopted, and the material can be widely applied to the fields of medical protection, sound insulation and noise reduction materials, buffering and damping materials, wiping materials and the like.

Description

Description LU504308
Title: MELT-BLOWN MEDICAL PROTECTIVE MATERIAL, ITS PREPARATION METHOD
AND APPLICATION
Technical Field
The present invention belongs to the field of melt-blown, hot air and hydroentanglement nonwoven materials and relates to the preparation of ultra-fine fibers, in particular to a melt-blown medical protective material of cattail leaf vein structure and a preparation method and application thereof.
Background Art
With the rapid economic development, the problems of environmental pollution and lack of resources are becoming more and more serious. Therefore, green development and resource regeneration are gradually being paid attention to. However, most polymer materials (such as polypropylene, polyethylene and polyester, etc.) are petroleum-based materials, which are difficult to degrade naturally and will cause irreversible damage to the natural ecology. Therefore, bio- friendly materials with biomimetic structures are attracting more and more attention.
As a biodegradable polymer material, polylactic acid has good thermoplasticity and certain thermal stability. It is suitable for melt-blown nonwoven molding technology and is currently a research hotspot in the field of nonwoven materials. However, the characteristics of polylactic acid melt-blown nonwovens make it have certain limitations in the application range. For example, in the field of wiping materials, polylactic acid melt-blown nonwovens have strong hydrophobic properties; in the field of cushioning and shock absorption materials, it has characteristics such as poor mechanical properties; in the field of sound insulation and noise reduction, it is difficult to make breakthroughs in sound insulation and noise reduction due to its thin material and low damping.
In order to solve the above problems, the patent CN112813580A mixes wood pulp fibers with good water absorption and oil absorption with polylactic acid fibers, and prepares microfibers after the two polymers are mixed by a melt-blown method, so that polylactic acid fibers can play the role of covering wood pulp. The function of fiber and improve its hydrophilic properties for the preparation of wiping materials; the patent CN112778721A is made by blending polylactic acid polymer and flexible degradable plastic PBAT or PES, inorganic compatibilizer, chain extender and plasticizer. Polylactic acid material with better mechanical properties and hydrolysis resistance; the patent CN109721977A is melt-blended by polylactic acid and polybutylene terephthalate modified by chemical grafting to achieve the toughness of polylactic acid material
Improvement; the patent CN211106082U makes the modal fiber material and the polylactic acid fiber material composite, and sets a number of protrusions on the polylactic acid fiber material layer to achieve the purpose of sound insulation and noise reduction. However, the polylactic ackd/504308 material produced by the above preparation method is difficult to achieve a balance in the fields of green environmental protection, wiping, buffering and shock absorption, and sound insulation and noise reduction. Therefore, how to manufacture a non-woven material that is green, has excellent mechanical properties, good hydrophilic properties and good biodegradability has become a common problem that the industry needs to solve urgently.
Summary of the Invention
In order to solve the above problems, the present invention proposes a melt-blown medical protective material of cattail leaf vein structure and a preparation method and application thereof.
The obtained superfine fiber nonwoven material not only has excellent mechanical strength and good liquid directional horizontal diffusion ability, it also has green process and biodegradable eco-friendly properties.
According to an aspect of the present invention, a preparation method of a melt-blown medical protective material is proposed.
The preparation method of a melt-blown medical protective material comprises the following steps: (1) preparation process: mixing hydrophilic modified particles with polylactic acid polymer for granulation to obtain polylactic acid polymer slices containing co-hydrophilic particles; (2) preparation process of directionally aligned fiber layers: sending the polylactic acid polymer slices containing hydrophilic modified particles prepared in step (1) into a melt-blown device for melt-blown process to prepare polylactic acid fiber mesh, i.e., directionally aligned fiber layer; (3) preparation process of fluffy biodegradable cellulose fiber layer: the cellulose fibers are fed into the feeding port of a carding machine and formed into a web through cylinder and Doffer carding, resulting in a fluffy biodegradable cellulose fiber layer; (4) water-jet reinforcement process for a three-layer composite material: the directionally aligned fiber layer, the fluffy biodegradable cellulose fiber layer, and the directionally aligned fiber layer are stacked in sequence, and then reinforced by high-pressure water jet after undergoing the hydroentanglement process, finally forming a melt-blown medical protective material of cattail leaf vein structure.
According some embodiments, the hydrophilic modified particles in step (1) are one or more combinations of polyethylene glycol, sodium dodecyl sulfonate, or sodium sec-alkyl sulfonate; the mass ratio of the co-hydrophilic particles to the polylactic acid polymer is (0.1-20):100; and the water bath temperature during the blending of the hydrophilic modified particles and the polylactic acid polymer is 80°C.
According some embodiments, the parameters of the melt-blown process in step (2) aré:U504308 temperature zone 1 of the screw extruder is 180°C, temperature zone 2 is 200°C, temperature zone 3 is 220°C, temperature of the metering pump is 220°C, temperature of the die head is 220°C, temperature of the hot air injection device is 90°C, and the receiving distance of the receiving mesh curtain of the melt-blown device is 15cm.
According some embodiments, a hot air injection device is provided above the receiving mesh curtain of the melt-blown device, and an air-absorbing device is provided below it. After the polylactic acid fiber mesh is deposited on the receiving mesh curtain of the melt-blown device and has not been completely cooled, it is stretched to form a directionally aligned fiber layer of hydrophilic biodegradable nonwoven material.
According some embodiments, the stretching is achieved by mechanical heat drafting and/or friction slip drafting, wherein the mechanical heat drafting utilizes the difference in speed between the receiving mesh curtain of the melt-blown device and the winding device to achieve stretching effect, with a drafting multiplier of 2.1-3.0; the friction slip drafting utilizes the forward pressure of the hot air injection device above the receiving mesh curtain of the melt-blown device and the air- absorbing device below the receiving mesh curtain to apply pressure on the polylactic acid fiber mesh, so that the polylactic acid fiber mesh is drawn and elongated between the receiving mesh curtain of the melt-blown device and the winding device with friction and slippage during the receiving process.
According some embodiments, in step (3), the cellulose fibers are wood pulp fibers, viscose fibers, or lyocell fibers, or a combination thereof, with a fiber diameter of 3 denier - 7 denier, a number of curls of 18 curls/hour - 28 curls/hour, and the obtained fluffy biodegradable cellulose fiber layer has a surface density of 60 g/m2 - 80 g/m2, a thickness of 20 mm - 25 mm, and a porosity of 95% - 99%.
According some embodiments, the water jet diameter of the hydroentanglement process in step (4) is 0.14mm, the water jet arrangement density is 15 needles/m, and the water entanglement is carried out using a double mesh curtain clamping method; the energy of the high- pressure water jet is 21-30J/g.
According to another aspect of the present invention, a melt-blown medical protective material prepared by any of the above methods is proposed.
The density of the melt-blown medical protective material is 80g/cm2-150g/m2 (GB/T 24218.1-2009), the porosity is 85%-95%, and the longitudinal tensile breaking strength is 105N- 185N (GB/T 24218.3-2010), the longitudinal tensile elongation at break is 20%-40% (GB/T 24218.3-2010), the transverse tensile breaking strength is 25N-70N (GB/T 24218.3-2010), and the transverse tensile elongation at break is 25N-70N (GB/T 24218.3-2010). 45%-70% (GB/T 24218.3-2010), the bursting strength is 135N-225N (GB/T 24218.5-2016), and the liquid diffusion ellipse ratio is 1.5-3. LU504308
According some embodiments, the surface density of the melt-blown medical protective material is 80g/cm2-150g/m2, the porosity is 85%-95%, the longitudinal tensile strength is 105N- 185N, the longitudinal tensile elongation at break is 20%-40%, the traverse tensile strength at break is 25N-70N, the traverse tensile elongation at break is 45%-70%, the bursting strength is 135N-225N, and the liquid diffusion elliptical ratio is 1.5-3.
According to another aspect of the present invention, application of the melt-blown medical protective material as a degradable medical protective material, a sound-insulating and noise- reducing material, a buffering and shock-absorbing material or a wiping material is proposed.
The present invention has the following advantageous effects: 1. The melt-blown medical protective material of cattail leaf vein structure provided by the preparation method of the present invention has better water absorption and mechanical properties compared to general polylactic acid melt-blown nonwoven materials. In the early exploration, when the inventor tested the contact angle of cattail leaves, it was found that the water droplets were elliptical in shape as shown in Figure 8. Through the exploration of the stretching process of hydrophilic modified polylactic acid, its longitudinal orientation was improved as shown in Figure 9, and the shape of its liquid diffusion after hydrophilic modification and stretching was also elliptical as shown in Figure 10. In addition, the cellulose fiber (viscose) layer in the middle of the application can store liquid and can realize sound insulation effects such as buffering and shock absorption, and the preparation process of the melt-blown medical protective material of the cattail leaf vein structure is pollution-free. development concept. 2. The biodegradable non-woven material of cattail leaf vein structure obtained by the preparation method of the present invention can be applied in the field of wiping materials. Due to the hydrophilic modification of the blended hydrophilic particles, the surface layer of the polylactic acid fiber mesh of the material has good hydrophilic properties. By adding polyethylene glycol toughening modified polylactic acid raw materials, and then improving the orientation of the polylactic acid melt-blown non-woven materials through mechanical stretching, it has excellent mechanical properties. In addition, the fluffy fiber structure of the intermediate viscose layer has good storage capacity due to its fluffy fiber structure. Therefore, compared with other wiping materials, the degradable non-woven material of cattail vein structure has better wiping effect. 3. Compared with cushioning and shock-absorbing materials such as sponge, the degradable non-woven material of cattail vein structure provided by the present invention has a green and convenient molding process and biodegradable performance, and its three-layer composite structure (as shown in FIG. 4) shown), good mechanical properties and a fluffy fiber layer in the middle can play a large role in buffering and shock absorption. Among them, the longitudinal tensile breaking strength of the present invention is 105N-185N (GB/T 24218.3-2010),
the transverse tensile breaking strength is 25N-70N (GB/T 24218.3-2010), and the bursting/504308 strength is 135N-225N (GB/T 24218.3-2010). /T 24218.5-2016). 4. The degradable non-woven material of the cattail vein structure provided by the present invention has a bionic structure, and its higher longitudinal strength and better liquid horizontal 5 directional diffusion ability are similar to those of the cattail veins in nature, and the preparation process is environmentally friendly and convenient. The performance of degraded raw materials makes it have the trend of industrial application, and provides a better development direction for the fields of medical protective materials, sound insulation and noise reduction materials, cushioning and shock absorption materials and wiping materials.
Brief Description of the Drawings
In order to more clearly describe the technical solutions of the embodiments of the present invention, the accompanying drawings required in the embodiments will be described briefly below. It should be understood that the following accompanying drawings illustrate only some embodiments of the present invention and therefore should not be construed as a limitation on the scope thereof. For a person of ordinary skill in the art, other relevant accompanying drawings can also be obtained from these accompanying drawings without any creative effort.
Figure 1 is the preparation process route diagram of the hydrophilic degradable melt-blown nonwoven material in the present invention. Among them, 1-1 is a hopper, 1-2 is a screw extruder, 1-3 is a material path, 1-4 is a metering pump, 1-5 is a die, 1-6 is a polylactic acid fiber, and 1-7 is a Hot air device, 1-8 is a suction device, 1-9 is a receiving mesh curtain, and 1-10 is a melt- blown winding device.
Figure 2 is a schematic diagram of the preparation process of the fluffy degradable cellulose fiber nonwoven material in the present invention. Among them, 2-1 is the messy fiber feeding port, 2-2 is the stripping roller, 2-3 is the cotton feeder, 2-4 is the cotton feeder outlet, 2-5 is the conveying curtain, and 2-6 is the tin Lin, 2-7 are lickers, 2-8 are doffers, and 2-9 are receivers.
Figure 3 is a schematic diagram of the hydroentanglement reinforcement process of the three-layer composite material in the present invention. Among them, 3-1 is a three-layer laminated dry fiber web, 3-2 is a lower clamping mesh curtain, 3-3 is an upper clamping mesh curtain, 3-4 is a drum (dewatering box) |, 3- 5 is the drum (dehydration box) Il, 3-6 is the pre-wet hydroentanglement head, 3-7 is the hydroentanglement head |, Il, 3-8 is the hydroentanglement head Ill, IV, 3-9 is the guide roller, 3 -10 is the hydroentanglement head V and VI, 3-11 is the drum (dewatering box) Ill, 3-12 is the pressing roller, 3-13 is the composite non-woven material, and 3- 14 is the hydroentanglement winding device.
Figure 4 is a schematic diagram of the three-layer composite material before and after hydroentanglement. Figure 4-1 is the three-layer structure of the composite material before hydroentanglement, and Figure 4-2 is the three-layer structure of the composite material after theJ504308 hydroentanglement.
Figure 5 is a schematic diagram of a high magnification microscope. Wherein, Figure 5-1 is a schematic diagram of a high-power microscope of cattail leaves, and Figure 5-2 is a schematic diagram of a high-power microscope of the present invention.
Figure 6 is a scanning electron microscope image of the present invention. Among them, 6- 1 is the electron microscope image of the polylactic acid aligned fiber layer, 6-2 is the electron microscope image of the fluffy degradable cellulose fiber layer, and 6-3 is the cross-sectional electron microscope image of the present invention.
Figure 7 is an orientation angle distribution diagram of polylactic acid fibers in the present invention. Among them, Figure 7-1 is the orientation angle distribution diagram when the mass ratio of the blended hydrophilic modified particles to the polylactic acid raw material is 2:98, and
Figure 7-2 is the mass ratio of the blended hydrophilic modified particles to the polylactic acid raw material: The orientation angle distribution diagram at 3:97, Figure 7-3 is the orientation angle distribution diagram when the mass ratio of the blended hydrophilic modified particles and the polylactic acid raw material is 4:96.
Figure 8 is a schematic diagram of the contact angle of cattail leaves.
Figure 9 is a schematic diagram of the liquid diffusion of the present invention.
Figure 10 is a schematic diagram of the liquid diffusion of the present invention as a function oftime.
Detailed Description of Embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below in the embodiments of the present invention. Obviously, the described embodiments are some of, rather than all of, the embodiments of the present invention.
Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Embodiment 1
A preparation method of a melt-blown medical protective material of cattail leaf vein structure, the molding process flow is shown in Figure 1, Figure 2 and Figure 3, and the steps are as follows: (1) Preparation process of hydrophilic modified polymer
First, polyethylene glycol particles with an average particle size of 2500nm and sodium dodecyl sulfonate particles with an average particle size of 1000nm are blended in a mass ratio of 1:1. The mixture is then evenly distributed by melting itin a water bath at a temperature of 80°C.
The resulting mixture is then mixed with polylactic acid particles in a mass ratio of 2:98.
Subsequently, the mixture is sent into a granulator to obtain hydrophilic modifieel/504308 particles/polylactic acid polymer slices. (2) Preparation of web-forming process of aligned fiber layer
The hydrophilic modified particles/polylactic acid slices of step (1) are fed into the hopper 1- 1 of the melt-blown machine, melted and extruded by the screw extruder 1-2, transported through the material path 1-3, and metered and pressurized by the metering pump 1-4 to form a stable and uniform melt. The high-temperature airflows on both sides of the spinning plate 1-5 guide the polymer melt to be ejected from the spinning holes, and the polymer melt is stretched into ultra- fine polylactic acid fibers 1-6 under the action of high-temperature airflows. The fibers are then fibers are further stretched and drawn to the receiving mesh curtain 1-9 by the high-temperature airflows and the air-absorbing device 1-8 to form a directionally aligned fiber layer.
Based on the understanding that the melting point of polylactic acid is around 176°C, the process parameters of the melt-blown component are set as follows in this embodiment: the temperature of the screw extruder is set at zone 1 180°C, zone 2 200°C, and zone 3 220°C, the temperature of the metering pump is 220°C, the temperature of die heads 1-5 is 220°C, the temperature of the hot air is 90°C, and the receiving distance of the receiving mesh curtain of the melt-blown device is 15cm. (3) Stretch forming process of directionally aligned fiber layer
In the stretching process of step (2), the fiber web received by the melt-blown receiving mesh curtain 1-9 before it is completely cooled is mechanically heat stretched by using the speed difference between the melt-blown receiving mesh curtain 1-9 and the melt-blown winding device, with a stretching ratio of 2.1, and finally forms a hydrophilic and biodegradable polylactic acid nonwoven material with good mechanical properties. (4) Preparation process of fluffy degradable cellulose fiber layer
The cellulose fiber is fed into the messy fiber feeding port 2-1, combed by the cylinder 2-6 and the doffer 2-8, and then becomes a fluffy and degradable hot air non-woven material.
Among them, the cellulose fiber is viscose fiber, the fiber diameter is 4 deniers, and the number of crimps is 24/hour, the obtained fluffy degradable cellulose fiber layer has an area density of 65g/m2, a thickness of 20mm, and a porosity of 99%. (5) Hydroentanglement process for three-layer composites
The directionally aligned fiber layer, fluffy biodegradable cellulose fiber material and directionally aligned fiber layer are laminated in turn, and then passed through a double net curtain clamping hydroentanglement process (as shown in Figure 3), the laminated dry fiber web 3-1 of the three layers of material is pre-wetted by pre-wetting hydroentanglement head 3-6 under the clamping of lower clamping net curtain 3-2 and upper clamping net curtain 3-3, and then passed through hydroentanglement heads I, II 3-7, Ill, IV3-8 and V Then, the fiber network is reinforced by high-pressure water jets for several times, and during the hydroentanglement/504308 process, the fiber network is dewatered by the drums (dewatering box) I 3-4, II3-5 and II3-11, and the guiding roller 3-9 and pressure roller 3-12 play a role in stabilizing the transmission of the fiber network, and the compounded nonwoven material 3-13 is wound after the hydroentanglement winding device 3-14, and then dried to finally form the shamrock. Leaf vein structure of melt-blown medical protective material. The high-pressure water needle jet energy is 21J/g.
Regarding the prepared melt-blown medical protective material of cattail vein structure, the areal density, porosity, surface wetting properties and mechanical properties were measured and tested. The test results are shown in Table 1.
Figure 5 is a schematic diagram of a high magnification microscope. Among them, Fig. 5-1 is a schematic diagram of a high-power microscope of cattail leaves, and Fig. 5-2 is a schematic diagram of a high-power microscope of the present invention. It can be seen that the longitudinal apparent interface between the two has very similar optical properties; FIG. 6 is a characterization diagram of the present invention. Fig. 6-1 is the surface electron microscope image of the cellulose fiber layer, it can be seen that the fiber diameter is larger than that of the polylactic acid fiber layer and there is a larger pore structure between the fibers, Fig. 6-2 is the surface electron microscope image of the polylactic acid layer, it can be seen that It can be seen that the surface fibers of the present invention have finer fiber morphology and better fiber orientation, and 6-3 is the cross-sectional electron microscope image of the present invention. It can be seen that the present invention has a three-layer fiber structure, and the middle cellulose fiber layer is relatively fluffy; Figure 7 is the orientation angle distribution diagram of the polylactic acid fiber in the present invention, wherein, Fig. 7-1 is the orientation angle distribution diagram when the mass ratio of the blended hydrophilic modified particles and the polylactic acid raw material is 2:98, and the fiber diameter is distributed in Between 0.5um-4um, the diameter of the crude fiber is between 4- 10um, Fig. 7-2 is the orientation angle distribution when the mass ratio of the blended hydrophilic modified particles and the polylactic acid raw material is 3:97, at this time the diameter distribution of the fiber is between 2.5um-4.5um, and the diameter of the crude fiber is between 4.5-9um. Fig. 7-3 is the orientation angle distribution when the mass ratio of the blended hydrophilic modified particles and the polylactic acid raw material is 4:96, the fiber diameter is distributed between 0.1um-3.2um, and the coarse fiber diameter is distributed between 3.2-6um. Fig. 8 and Fig. 9 are the schematic diagram of the contact angle of the cattail leaf and the schematic diagram of the liquid diffusion of the present invention, respectively. It can be seen that the two have very similar longitudinal distribution patterns of the liquid. It can be seen that the liquid spreads horizontally and directionally with the change of time, which indicates that the present invention has the biomimetic structure of cattail veins.
Embodiment 2 LU504308
A preparation method of melt-blown medical protective material of cattail leaf vein structure is provided, with the following steps:
The preparation method of the present embodiment is the same as that of Embodiment 1, except that the mass ratio of a co-hydrophilic particle prepared by blending polyethylene glycol and sodium dodecyl sulfonate in step (1) with polylactic acid raw material is 3:97.
The characteristic test results are shown in Table 1.
Embodiment 3
A preparation method of a melt-blown medical protective material of cattail leaf vein structure, the steps are as follows:
The preparation method of the present embodiment is the same as that of embodiment 1, except that in step (1), the mass ratio of the hydrophilic modified particles of polyethylene glycol and sodium dodecyl sulfonate co-blended with the polylactic acid raw material is mixed at a ratio of 4:96.
The characteristic test results are shown in Table 1.
Embodiment 4
A preparation method of a melt-blown medical protective material of cattail leaf vein structure is as follows:
The preparation method of this embodiment is the same as that of Embodiment 1, except that: in step (1), the hydrophilic modified particles of polyethylene glycol and sodium dodecyl sulfonate are mixed with polylactic acid raw materials in a ratio of 3:97 by mass; in step (5), the energy of the high-pressure water jet in the hydroentanglement reinforcement process is 24 J/g.
The characteristic test results are shown in Table 1.
Embodiment 5
A preparation method of a melt-blown medical protective material of cattail leaf vein structure is as follows:
The preparation method of this embodiment is the same as that of Embodiment 1, except that: in step (1), the hydrophilic modified particles of polyethylene glycol and sodium dodecyl sulfonate are mixed with polylactic acid raw materials in a ratio of 3:97 by mass; in step (5), the energy of the high-pressure water jet in the hydroentanglement reinforcement process is 27 J/g.
The characteristic test results are shown in Table 1.
Embodiment 6
A preparation method of a melt-blown medical protective material of cattail leaf vein structure is as follows:
The preparation method of this embodiment is the same as that of Embodiment 1, except that: in step (1), the hydrophilic modified particles of polyethylene glycol and sodium dodecyl/504308 sulfonate are mixed with polylactic acid raw materials in a ratio of 3:97 by mass; in step (5), the energy of the high-pressure water jet in the hydroentanglement reinforcement process is 30J/g.
The characteristic test results are shown in Table 1.
Example of implementation effect
The characteristic indicators and the like in embodiments 1-6 were measured by the following methods. (1) Determination of areal density and porosity
Areal density refers to the mass per unit area of textile materials. The areal density is tested according to GB/T 24218.1-2009 (Test methods for nonwovens - Part 1 - Determination of mass per unit area).
Then, the density of the composite fiber material is calculated according to the density of each component of the two bicomponent filaments and their mass fraction in the composite fiber, and then the porosity of the fiber material in the product is calculated according to formula (1). 7 = (1 — G/(p; x T)) x 100% (1) ye fu ey Br Fags
Pp art pa Wartu Pa” Wy (2)
In the formula, G is the gram weight of the product, T is the material thickness, and is the fiber density, p1, p2 and pn are the densities of the components, and wi, Wa and w,, are the density fractions of the components. (2) Determination of Surface Wetting Properties
The contact angle was used to characterize the surface wetting properties of the samples.
The test instrument adopts an integral inclined contact angle measuring instrument (SDC-350,
Dongwan Shengding Precision Instrument Co., Ltd., China). The test standard is based on the standard DB44/T 1872-2016. The sample is cut out to a length of about 5cm and a width of about 3cm. A long strip, placed on the holder and keeping the surface of the sample flat, set the drop volume to 4 uL to record the change in the contact angle of the sample within 5 minutes. The test liquid is a 70% alcohol solution with a surface tension of 11.5-20mN/m. (3) Determination of Tensile Break Properties
The non-woven material constant temperature mechanical property analyzer (HD026S-100,
Nantong Hongda Experimental Instrument Co., Ltd., China) was used to measure the tensile fracture properties. According to the standard GB/T 24218.3-2010, the specifications were cut into pieces with a length of 200mm and a width of 50mm. Rectangle, the clamping distance of the instrument is 100mm, the stretching speed is 100mm/min, the test is performed 5 times, and the average value is calculated.
(4) Determination of Bursting Performance LU504308
A fabric strength machine (YG026MD-250, Wenzhou Darong Textile Instrument Co., Ltd,
China) was used to measure the burst performance, and according to the standard GB/T 24218.5- 2016, a disc sampler with a sampling area of 100cm2 was used for sampling, and the samples were placed on the holder, test 5 times and take the average value.
The test results are shown in following Table 1: © 2
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A |28 554 3585 3% 83 |A SS al — 2 81.4 à | 5 © 3 188 38 al Sl [—|. |e A gt 1723, 229528 2S = of | Zn © 282882828378 Éja19/2/2j8 [8 212181 =
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= = — fi El = < 5 gl-8 de
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Ë glad 4211142725
A 5 AREER EERIE IEE
As can be seen from Table 1, the surface density of the melt-blown medical protective material of the cattail leaf vein structure provided by the present invention is 80g/cm2-150g/m2 (GB/T 24218.1-2009), the porosity is 85%-95%, and the longitudinal tensile strength is 85%-95%.
The tensile breaking strength is 105N-185N (GB/T 24218.3-2010), the longitudinal tensile breaking elongation is 20%-40% (GB/T 24218.3-2010), and the transverse tensile breaking strength is 25N-70N (GB/T 24218.3-2010), the transverse tensile elongation at break is 45%-70% (GB/T 24218.3-2010), the bursting strength is 135N-225N (GB/T 24218.5-2016), and the liquid diffusion elliptical ratio is 1.5 -3.
The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention within the scope of protection.

Claims (10)

1. A preparation method of a melt-blown medical protective material, characterized in that it comprises the following steps: (1) preparation process: mixing hydrophilic modified particles with polylactic acid polymer for granulation to obtain polylactic acid polymer slices containing co-hydrophilic particles; (2) preparation process of directionally aligned fiber layers: sending the polylactic acid polymer slices containing hydrophilic modified particles prepared in step (1) into a melt-blown device for melt-blown process to prepare polylactic acid fiber mesh, i.e., directionally aligned fiber layer; (3) preparation process of fluffy biodegradable cellulose fiber layer: the cellulose fibers are fed into the feeding port of a carding machine and formed into a web through cylinder and Doffer carding, resulting in a fluffy biodegradable cellulose fiber layer; (4) hydroentanglement reinforcement process for a three-layer composite material: the directionally aligned fiber layer, the fluffy biodegradable cellulose fiber layer, and the directionally aligned fiber layer are stacked in sequence, and then reinforced by high-pressure water jet after undergoing the hydroentanglement process, finally forming a melt-blown medical protective material of cattail leaf vein structure.
2. The preparation method according to claim 1, characterized in that: the hydrophilic modified particles in step (1) are one or more combinations of polyethylene glycol, sodium dodecyl sulfonate, or sodium sec-alkyl sulfonate; the mass ratio of the co-hydrophilic particles to the polylactic acid polymer is (0.1-20):100; and the water bath temperature during the blending of the hydrophilic modified particles and the polylactic acid polymer is 80°C.
3. The preparation method according to claim 1, characterized in that the parameters of the melt-V504308 blown process in step (2) are: temperature zone 1 of the screw extruder is 180°C, temperature zone 2 is 200°C, temperature zone 3 is 220°C, temperature of the metering pump is 220°C, temperature of the die head is 220°C, temperature of the hot air injection device is 90°C, and the receiving distance of the receiving mesh curtain of the melt-blown device is 15cm.
4. The preparation method according to claim 3, characterized in that: a hot air injection device is provided above the receiving mesh curtain of the melt-blown device, and an air-absorbing device is provided below it, after the polylactic acid fiber mesh is deposited on the receiving mesh curtain of the melt-blown device and has not been completely cooled, it is stretched to form a directionally aligned fiber layer of hydrophilic biodegradable nonwoven material.
5. The preparation method according to claim 4, characterized in that the stretching is achieved by mechanical heat drafting and/or friction slip drafting, wherein the mechanical heat drafting utilizes the difference in speed between the receiving mesh curtain of the melt-blown device and the winding device to achieve stretching effect, with a drafting multiplier of 2.1-3.0; the friction slip drafting utilizes the forward pressure of the hot air injection device above the receiving mesh curtain of the melt-blown device and the air-absorbing device below the receiving mesh curtain to apply pressure on the polylactic acid fiber mesh, so that the polylactic acid fiber mesh is drawn and elongated between the receiving mesh curtain of the melt-blown device and the winding device with friction and slippage during the receiving process.
6. The preparation method according to claim 1, characterized in that: in step (3), the cellulose fibers are wood pulp fibers, viscose fibers, or lyocell fibers, or a combination thereof, with a fiber diameter of 3 denier - 7 denier, a number of curls of 18 curls/hour - 28 curls/hour, and the obtained fluffy biodegradable cellulose fiber layer has a surface density of 60 g/m2 - 80 g/m2, a thickness of 20 mm - 25 mm, and a porosity of 95% - 99%.
7. The preparation method according to claim 1, characterized in that: the water jet diameter 6504308 the hydroentanglement process in step (4) is 0.14mm, the water jet arrangement density is 15 needles/m, and the water entanglement is carried out using a double mesh curtain clamping method; the energy of the high-pressure water jet is 21-30J/g.
8. A melt-blown medical protective material prepared by method according to any one of claims
1-7.
9. The melt-blown medical protective material according to claim 8, characterized in that the surface density of the melt-blown medical protective material is 80g/cm2-150g/m2, the porosity is 85%-95%, the longitudinal tensile strength is 105N-185N, the longitudinal tensile elongation at break is 20%-40%, the traverse tensile strength at break is 25N-70N, the traverse tensile elongation at break is 45%-70%, the bursting strength is 135N-225N, and the liquid diffusion elliptical ratio is 1.5-3.
10. Application of the melt-blown medical protective material of claim 9 as a degradable medical protective material, a sound-insulating and noise-reducing material, a buffering and shock- absorbing material or a wiping material.
LU504308A 2023-05-25 2023-05-25 Melt-blown medical protective material, its preparation method and application LU504308B1 (en)

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