Degradable surgical gown fabric and method of making

Abstract

The application relates to a degradable surgical gown fabric, which comprises upper and lower layers of PLA non-woven fabric and an intermediate layer of degradable film, the PLA non-woven fabric and the degradable film are bonded by degradable hot melt adhesive, and the surgical gown fabric comprises, from bottom to top, 18g / m 2 PLA non-woven fabric, 2g / m 2 degradable hot melt adhesive, 20g / m 2 degradable film, 2g / m 2 degradable hot melt adhesive and 18g / m 2 PLA non-woven fabric. The surgical gown fabric prepared by the application is composed of PLA non-woven fabric, degradable hot melt adhesive and degradable film, so that the surgical gown fabric has strong degradability; by adjusting the component content of the degradable hot melt adhesive and the degradable film, the longitudinal and transverse tensile rates of the PLA non-woven fabric, the degradable hot melt adhesive and the degradable film are equivalent, the elongation at break of the fabric is ensured to be greater than or equal to 350%, the dry burst strength is greater than or equal to 65kPa, and the performance requirements of the surgical gown are met.

Description

Technical Field

[0001] This invention relates to the field of medical textile technology, and in particular to a biodegradable surgical gown fabric and its preparation method. Background Technology

[0002] Disposable surgical gowns are protective garments specifically designed for surgical procedures to protect healthcare workers from microorganisms such as bacteria and viruses, and to minimize the spread of infectious agents to patients' surgical wounds. They are made of sterile fibrous materials and typically consist of a cap, a top, and trousers. These surgical gowns are waterproof and antibacterial, effectively isolating and protecting against pathogens in the operating room.

[0003] Disposable surgical gowns are made of nonwoven or coated nonwoven composite materials with certain protective properties. While these materials possess excellent tensile strength, abrasion resistance, absorbency, and water pressure resistance, they may still present some potential problems. Some surgical gowns may be made of non-degradable materials, such as synthetic fibers like polyethylene, polypropylene, polyester, or nylon. These materials are difficult to decompose in the natural environment and may cause pollution. Summary of the Invention

[0004] The purpose of this invention is to provide a biodegradable surgical gown fabric and its preparation method, so as to solve the technical problem that the natural degradation time of surgical gowns in the prior art is too long.

[0005] The specific technical solution of the biodegradable surgical gown fabric and its preparation method of the present invention is as follows:

[0006] A biodegradable surgical gown fabric comprises two layers of PLA nonwoven fabric and a middle layer of biodegradable film, wherein the PLA nonwoven fabric and the biodegradable film are bonded together by a biodegradable hot melt adhesive, and the surgical gown fabric comprises 18 g / m² from bottom to top. 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric;

[0007] The biodegradable membrane comprises the following raw materials in parts by weight:

[0008] 50-60 parts of modified polylactic acid;

[0009] 10-15 parts of polycaprolactone;

[0010] 2-5 parts polyester carbonate;

[0011] 10-15 parts of modified polyhydroxyalkanoate;

[0012] The biodegradable hot melt adhesive comprises the following raw materials in parts by weight:

[0013] 3-6 parts of polyetheramine;

[0014] 15-30 parts of unsaturated polyester resin;

[0015] Antibacterial agent 0.2-0.5 parts;

[0016] 1-3 parts flame retardant;

[0017] Vegetable oil-based plasticizer: 20-25 parts.

[0018] Preferably, the modified polylactic acid has the following raw materials and weight parts: 25-30 parts polylactic acid, 15-20 parts tributyl citrate, 3-8 parts cumene peroxide, 1-2 parts tetrabutyl titanate, and 1-5 parts surfactant.

[0019] Preferably, the polylactic acid is polylactic acid prepared from corn starch.

[0020] Preferably, the modified polyhydroxyalkanoate is composed of the following raw materials and weight parts: 100 parts polyhydroxyalkanoate and 5-20 parts maleic anhydride.

[0021] Preferably, the surgical gown fabric has a breaking elongation ≥350%, a dry burst strength ≥65kPa, and an air permeability ≥170m. 2 / s.

[0022] Preferably, the antibacterial agent of the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen-based flame retardant.

[0023] This invention also provides a method for preparing a biodegradable surgical gown fabric, comprising the following steps:

[0024] Preparation of biodegradable film: 50-60 parts of modified polylactic acid, 10-15 parts of polycaprolactone, 2-5 parts of polyester carbonate, and 10-15 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly. The mixture was then plasticized and extruded using a casting machine heated to 150-190℃, resulting in an extruded film thickness of 20 g / m². 2 Finally, the film is formed by rolling and shaping at 15-20℃. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0025] Preparation of biodegradable hot melt adhesive: 8-15 parts of polyetheramine, 16-30 parts of unsaturated polyester resin, 0.2-0.5 parts of antibacterial agent, 1-3 parts of flame retardant, and 20-25 parts of vegetable oil-based plasticizer are placed in a melt mixer and thoroughly mixed at a melting temperature of 160-180℃; the melt mixture is then filtered to obtain the biodegradable hot melt adhesive, which is then packaged for later use.

[0026] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film, and the upper layer of PLA nonwoven fabric are sequentially bonded together with biodegradable hot melt adhesive to form the surgical gown fabric. The surgical gown fabric comprises 18g / m² from bottom to top. 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0027] Preferably, the modified polylactic acid is prepared by: melting and mixing 25-30 parts of raw polylactic acid, 15-20 parts of tributyl citrate, 3-8 parts of cumene peroxide, 1-2 parts of tetrabutyl titanate and 1-5 parts of surfactant under a pressure of 30-50 Pa, with a melting temperature of 140-200 °C, to obtain modified polylactic acid.

[0028] Preferably, the modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 5-20 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed, and dried to obtain the modified polyhydroxyalkanoate.

[0029] Preferably, the surgical gown fabric is bonded and molded by PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film through a 5.5MPa pressure roller during the bonding and molding process.

[0030] The biodegradable surgical gown fabric and its preparation method of the present invention have the following advantages:

[0031] 1. The surgical gown fabric prepared by this invention is composed of PLA nonwoven fabric, biodegradable hot melt adhesive, and biodegradable film, giving the surgical gown fabric strong biodegradability. At the same time, by modifying the raw materials of the biodegradable film, it is made biodegradable and tensile. By adjusting the raw materials and proportions of the biodegradable hot melt adhesive, a biodegradable hot melt adhesive with certain tensile properties is prepared, so that the prepared fabric can meet the performance requirements for manufacturing surgical gowns. By adjusting the content of each component of the biodegradable hot melt adhesive and the biodegradable film, the longitudinal and transverse tensile rates of the PLA nonwoven fabric, biodegradable hot melt adhesive, and biodegradable film are made comparable, ensuring that the breaking elongation of the fabric is ≥350% and the dry bursting strength is ≥65kPa, which meets the performance requirements of surgical gowns.

[0032] 2. The biodegradable hot melt adhesive of this invention is composed of polyetheramine, unsaturated polyester resin, antibacterial agent, flame retardant, and vegetable oil-based plasticizer. This composition gives the hot melt adhesive bonding ability and strong biodegradability. Polyetheramine and unsaturated polyester resin are biodegradable materials, added in a 1:5 weight ratio to crosslink and form a biodegradable hot melt adhesive with bonding ability. The antibacterial agent is chitosan from crab shells; the small amount of chitosan added is environmentally friendly, safe, and easy to add, meeting the antibacterial requirements of surgical gowns while also being non-toxic, biodegradable, and biocompatible. The flame retardant is a phosphorus-nitrogen-based flame retardant, which is halogen-free, low-smoke, low-toxic, and environmentally friendly, giving the surgical gown fabric certain flame-retardant properties. The vegetable oil-based plasticizer is an environmentally friendly plasticizer that also ensures the biodegradability of the material. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the layered structure of the surgical gown fabric prepared according to the present invention. Detailed Implementation

[0034] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0035] Example 1

[0036] A method for preparing a biodegradable surgical gown fabric includes the following steps:

[0037] Preparation of biodegradable film: 50 parts of modified polylactic acid, 15 parts of polycaprolactone, 4 parts of polyester carbonate, and 10 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly. After being heated to 150℃ in a casting machine, the mixture was plasticized and extruded to produce a film thickness of 20 g / m. 2 Finally, the film is formed by rolling and shaping at 15°C. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0038] The modified polylactic acid is prepared as follows: under a pressure of 50 Pa, 25 parts of raw polylactic acid, 20 parts of tributyl citrate, 3 parts of cumene peroxide, 1 part of tetrabutyl titanate and 1 part of surfactant are melt-mixed at a melting temperature of 160℃ to obtain modified polylactic acid; the raw polylactic acid is polylactic acid prepared from corn starch.

[0039] The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 10 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed and dried to obtain the modified polyhydroxyalkanoate.

[0040] Preparation of biodegradable hot melt adhesive: 3 parts of raw material polyetheramine, 15 parts of unsaturated polyester resin, 0.3 parts of antibacterial agent, 1 part of flame retardant and 20 parts of vegetable oil-based plasticizer are put into a melt mixer and thoroughly mixed at a melting temperature of 170℃; the melt mixture is filtered to obtain biodegradable hot melt adhesive, which is then packaged for later use; the antibacterial agent in the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen flame retardant.

[0041] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film and the upper layer of PLA nonwoven fabric are bonded together in sequence with biodegradable hot melt adhesive. During the bonding and molding process, the PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film are pressed and molded by a 5.5MPa pressure roller to form the surgical gown fabric.

[0042] The surgical gown fabric, from bottom to top, includes 18g / m². 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0043] like Figure 1 The diagram shows the layered structure of the surgical gown fabric prepared in this embodiment. As can be seen from the diagram, the surgical gown fabric includes, from bottom to top, PLA nonwoven fabric, biodegradable hot melt adhesive, biodegradable film, biodegradable hot melt adhesive, and PLA nonwoven fabric.

[0044] The surgical gown fabric was tested and found to have a breaking elongation of 380%, a dry burst strength of ≥66.8 kPa, and an air permeability of 182 m². 2 / s.

[0045] Example 2

[0046] A method for preparing a biodegradable surgical gown fabric includes the following steps:

[0047] Preparation of biodegradable film: 60 parts of modified polylactic acid, 10 parts of polycaprolactone, 2 parts of polyester carbonate, and 15 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly. After being heated to 180℃ in a casting machine, the mixture was plasticized and extruded to produce a film thickness of 20 g / m. 2 Finally, the film is formed by rolling and shaping at 18°C. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0048] The modified polylactic acid is prepared by melting and mixing 30 parts of raw polylactic acid, 18 parts of tributyl citrate, 5 parts of cumene peroxide, 1 part of tetrabutyl titanate and 2 parts of surfactant under a pressure of 30 Pa at a melting temperature of 140 °C to obtain modified polylactic acid; the raw polylactic acid is polylactic acid prepared from corn starch.

[0049] The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 20 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed and dried to obtain the modified polyhydroxyalkanoate.

[0050] Preparation of biodegradable hot melt adhesive: 4 parts of raw material polyetheramine, 20 parts of unsaturated polyester resin, 0.2 parts of antibacterial agent, 2 parts of flame retardant and 25 parts of vegetable oil-based plasticizer are put into a melt mixer and thoroughly mixed at a melting temperature of 160℃; the melt mixture is filtered to obtain biodegradable hot melt adhesive, which is then packaged for later use; the antibacterial agent in the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen flame retardant.

[0051] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film and the upper layer of PLA nonwoven fabric are bonded together in sequence with biodegradable hot melt adhesive. During the bonding and molding process, the PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film are pressed and molded by a 5.5MPa pressure roller to form the surgical gown fabric.

[0052] The surgical gown fabric, from bottom to top, includes 18g / m². 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0053] The surgical gown fabric was tested and found to have a breaking elongation of 350%, a dry burst strength of 65.9 kPa, and an air permeability of 185 m². 2 / s.

[0054] Example 3

[0055] A method for preparing a biodegradable surgical gown fabric includes the following steps:

[0056] Preparation of biodegradable film: 55 parts of modified polylactic acid, 13 parts of polycaprolactone, 5 parts of polyester carbonate, and 13 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly, and plasticized and extruded by heating to 190℃ in a casting machine. The thickness of the extruded film was 20 g / m. 2 Finally, the film is formed by rolling and shaping at 20°C. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0057] The modified polylactic acid is prepared as follows: under a pressure of 40 Pa, 28 parts of raw polylactic acid, 15 parts of tributyl citrate, 8 parts of cumene peroxide, 1.5 parts of tetrabutyl titanate, and 5 parts of surfactant are melt-mixed at a melting temperature of 180℃ to obtain modified polylactic acid; the raw polylactic acid is polylactic acid prepared from corn starch.

[0058] The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 5 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed and dried to obtain the modified polyhydroxyalkanoate.

[0059] Preparation of biodegradable hot melt adhesive: 6 parts of raw material polyetheramine, 30 parts of unsaturated polyester resin, 0.5 parts of antibacterial agent, 3 parts of flame retardant and 21 parts of vegetable oil-based plasticizer are put into a melt mixer and thoroughly mixed at a melting temperature of 180℃; the melt mixture is filtered to obtain biodegradable hot melt adhesive, which is then packaged for later use; the antibacterial agent in the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen flame retardant.

[0060] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film and the upper layer of PLA nonwoven fabric are bonded together in sequence with biodegradable hot melt adhesive. During the bonding and molding process, the PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film are pressed and molded by a 5.5MPa pressure roller to form the surgical gown fabric.

[0061] The surgical gown fabric, from bottom to top, includes 18g / m². 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0062] The surgical gown fabric was tested and found to have a breaking elongation of 365%, a dry burst strength of 67.5 kPa, and an air permeability of 170 m³ / h. 2 / s.

[0063] Example 4

[0064] A method for preparing a biodegradable surgical gown fabric includes the following steps:

[0065] Preparation of biodegradable film: 58 parts of modified polylactic acid, 14 parts of polycaprolactone, 3 parts of polyester carbonate, and 10 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly, and plasticized and extruded by heating to 160℃ in a casting machine. The thickness of the extruded film was 20 g / m. 2Finally, the film is formed by rolling and shaping at 15°C. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0066] The modified polylactic acid is prepared as follows: under a pressure of 30 Pa, 26 parts of raw polylactic acid, 17 parts of tributyl citrate, 4 parts of cumene peroxide, 2 parts of tetrabutyl titanate, and 4 parts of surfactant are melt-mixed at a melting temperature of 200℃ to obtain modified polylactic acid; the raw polylactic acid is polylactic acid prepared from corn starch.

[0067] The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 15 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed and dried to obtain the modified polyhydroxyalkanoate.

[0068] Preparation of biodegradable hot melt adhesive: 3 parts of raw material polyetheramine, 15 parts of unsaturated polyester resin, 0.4 parts of antibacterial agent, 2 parts of flame retardant and 24 parts of vegetable oil-based plasticizer are put into a melt mixer and thoroughly mixed at a melting temperature of 180℃; the melt mixture is filtered to obtain biodegradable hot melt adhesive, which is then packaged for later use; the antibacterial agent in the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen flame retardant.

[0069] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film and the upper layer of PLA nonwoven fabric are bonded together in sequence with biodegradable hot melt adhesive. During the bonding and molding process, the PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film are pressed and molded by a 5.5MPa pressure roller to form the surgical gown fabric.

[0070] The surgical gown fabric, from bottom to top, includes 18g / m². 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0071] The surgical gown fabric was tested and found to have a breaking elongation of 380%, a dry burst strength of 66.1 kPa, and an air permeability of 195 m². 2 / s.

[0072] Example 5

[0073] A method for preparing a biodegradable surgical gown fabric includes the following steps:

[0074] Preparation of biodegradable film: 53 parts of modified polylactic acid, 10 parts of polycaprolactone, 5 parts of polyester carbonate, and 15 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly. After being heated to 160℃ in a casting machine, the mixture was plasticized and extruded to produce a film thickness of 20 g / m. 2 Finally, the film is formed by rolling and shaping at 15°C. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into a roll.

[0075] The modified polylactic acid is prepared as follows: under a pressure of 30 Pa, 25 parts of raw polylactic acid, 20 parts of tributyl citrate, 6 parts of cumene peroxide, 2 parts of tetrabutyl titanate, and 3 parts of surfactant are melt-mixed at a melting temperature of 200℃ to obtain modified polylactic acid; the raw polylactic acid is polylactic acid prepared from corn starch.

[0076] The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 10 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, and carrying out a polymerization reaction. After the reaction is completed, the mixture is centrifuged, washed and dried to obtain the modified polyhydroxyalkanoate.

[0077] Preparation of biodegradable hot melt adhesive: 5 parts of raw material polyetheramine, 25 parts of unsaturated polyester resin, 0.3 parts of antibacterial agent, 3 parts of flame retardant and 23 parts of vegetable oil-based plasticizer are put into a melt mixer and thoroughly mixed at a melting temperature of 180℃; the melt mixture is filtered to obtain biodegradable hot melt adhesive, which is then packaged for later use; the antibacterial agent in the biodegradable hot melt adhesive is chitosan extracted from crab shells, and the flame retardant is a phosphorus-nitrogen flame retardant.

[0078] Bonding and molding: The lower layer of PLA nonwoven fabric, the middle layer of biodegradable film and the upper layer of PLA nonwoven fabric are bonded together in sequence with biodegradable hot melt adhesive. During the bonding and molding process, the PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film are pressed and molded by a 5.5MPa pressure roller to form the surgical gown fabric.

[0079] The surgical gown fabric, from bottom to top, includes 18g / m². 2 PLA nonwoven fabric, 2g / m 2 Biodegradable hot melt adhesive, 20g / m 2 Biodegradable membrane, 2g / m 2 Biodegradable hot melt adhesive and 18g / m 2 PLA nonwoven fabric.

[0080] like Figure 1 The diagram shows the layered structure of the surgical gown fabric prepared in this embodiment. As can be seen from the diagram, the surgical gown fabric includes, from bottom to top, PLA nonwoven fabric, biodegradable hot melt adhesive, biodegradable film, biodegradable hot melt adhesive, and PLA nonwoven fabric.

[0081] The surgical gown fabric was tested and found to have a breaking elongation of 355%, a dry burst strength of 66 kPa, and an air permeability of 180 m³ / h. 2 / s.

[0082] In Examples 1-5, the components of the raw materials and their corresponding weight parts are shown in Table 1.

[0083] Table 1 shows the raw materials and their weight proportions in the examples.

[0084]

[0085]

[0086] Comparative Example 1

[0087] The only difference between this comparative example and Example 1 is that the modified polylactic acid in the biodegradable film is replaced with commercially available polylactic acid. All other raw materials and components remain unchanged, and the preparation conditions are also unchanged. The resulting biodegradable surgical gown fabric, after testing, exhibits an elongation at break of 280%, a dry burst strength of 55 kPa, and an air permeability of 115 m³ / h. 2 / s.

[0088] Therefore, it can be seen that surgical gown fabrics made from ordinary polylactic acid have slightly reduced tensile strength and significantly reduced breathability.

[0089] Comparative Example 2

[0090] The only difference between this comparative example and Example 1 is that the modified polyhydroxyalkanoate in the biodegradable film is replaced with a commercially available polyhydroxyalkanoate. The raw materials and components remain unchanged, and the preparation conditions remain the same. The resulting biodegradable surgical gown fabric exhibits a breaking elongation of 230%, a dry burst strength of 48 kPa, and an air permeability of 140 m³ / h. 2 / s.

[0091] Therefore, it can be seen that surgical gown fabrics made from ordinary polyhydroxyalkanoates have significantly reduced tensile strength and slightly insufficient breathability.

[0092] Comparative Example 3

[0093] The only difference between this comparative example and Example 1 is that the modified polylactic acid in the biodegradable film is replaced with ordinary commercially available polylactic acid, and the modified polyhydroxyalkanoate in the biodegradable film is replaced with ordinary commercially available polyhydroxyalkanoate. The raw materials and components remain unchanged, and the preparation conditions remain the same. The resulting biodegradable surgical gown fabric, after testing, has a breaking elongation of 220%, a dry burst strength of 45 kPa, and an air permeability of 120 m³ / h. 2 / s.

[0094] This shows that surgical gown fabrics made from common polylactic acid and polyhydroxyalkanoates have significantly reduced tensile strength and severely insufficient breathability.

[0095] Comparative Examples 4-8

[0096] The only difference between Comparative Examples 4-8 and Example 3 is that the addition ratio of polyetheramine and unsaturated polyester resin, the raw materials for biodegradable hot melt adhesive, is adjusted, as shown in Table 2.

[0097]

[0098] With the raw materials and components remaining unchanged, and the preparation conditions remaining unchanged, the resulting biodegradable surgical gown fabric was tested.

[0099] Therefore, it can be seen that by adjusting the raw materials and proportions of biodegradable hot melt adhesive, a biodegradable hot melt adhesive with certain tensile properties can be prepared, so that the fabric prepared can meet the performance requirements for manufacturing surgical gowns.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A biodegradable surgical gown fabric, characterized in that, It comprises two layers of PLA nonwoven fabric and a middle layer of biodegradable film, wherein the PLA nonwoven fabric and the biodegradable film are bonded together by biodegradable hot melt adhesive; The biodegradable membrane comprises the following raw materials in parts by weight: 50-60 parts of modified polylactic acid; 10-15 parts of polycaprolactone; 2-5 parts polycarbonate; 10-15 parts of modified polyhydroxyalkanoate; The biodegradable hot melt adhesive comprises the following raw materials in parts by weight: 3-6 parts of polyetheramine; 15-30 parts of unsaturated polyester resin; Antibacterial agent 0.2-0.5 parts; 1-3 parts flame retardant; Vegetable oil-based plasticizer: 20-25 parts; The raw materials and weight parts of the modified polylactic acid are: 25-30 parts of polylactic acid, 15-20 parts of tributyl citrate, 3-8 parts of cumene peroxide, 1-2 parts of tetrabutyl titanate and 1-5 parts of surfactant. The modified polylactic acid is prepared by melting and mixing 25-30 parts of raw polylactic acid, 15-20 parts of tributyl citrate, 3-8 parts of cumene peroxide, 1-2 parts of tetrabutyl titanate and 1-5 parts of surfactant under a pressure of 30-50 Pa. The melting temperature is 140-200℃ to obtain the modified polylactic acid. The raw materials and weight parts of the modified polyhydroxyalkanoate are: 100 parts of polyhydroxyalkanoate and 5-20 parts of maleic anhydride; The modified polyhydroxyalkanoate is prepared by dissolving 100 parts of raw polyhydroxyalkanoate and 5-20 parts of maleic anhydride in ethanol solvent, adding an inorganic peroxide initiator, carrying out a polymerization reaction, and centrifuging, washing and drying after the reaction to obtain the modified polyhydroxyalkanoate. The surgical gown fabric has a breaking elongation of ≥350%, a dry burst strength of ≥65kPa, and an air permeability of ≥170m2 / s. The flame retardant used in the biodegradable hot melt adhesive is a phosphorus-nitrogen based flame retardant.

2. The biodegradable surgical gown fabric according to claim 1, characterized in that, Polylactic acid (PLA) is prepared from corn starch.

3. The method for preparing a biodegradable surgical gown fabric according to claim 1, characterized in that, Includes the following steps: Preparation of biodegradable film: 50-60 parts of modified polylactic acid, 10-15 parts of polycaprolactone, 2-5 parts of polycarbonate, and 10-15 parts of modified polyhydroxyalkanoate were dried and dehumidified separately, then stirred evenly. After being plasticized and extruded by heating to 150-190℃ in a casting machine, the extruded film thickness was 20 g / m. 2 Finally, the film is formed by rolling and shaping at 15-20℃. After film formation, it is subjected to oscillating edge trimming and corona treatment and then rolled into rolls. Preparation of biodegradable hot melt adhesive: 3-6 parts of polyetheramine, 15-30 parts of unsaturated polyester resin, 0.2-0.5 parts of antibacterial agent, 1-3 parts of flame retardant, and 20-25 parts of vegetable oil-based plasticizer are placed in a melt mixer and thoroughly mixed at a melting temperature of 160-180℃; the melt mixture is then filtered to obtain the biodegradable hot melt adhesive, which is then packaged for later use. Bonding and molding: The lower PLA nonwoven fabric, the middle biodegradable film, and the upper PLA nonwoven fabric are sequentially bonded together with biodegradable hot melt adhesive to form the surgical gown fabric. The surgical gown fabric comprises 18 g / m² from bottom to top. 2 PLA nonwoven fabric, 2 g / m 2 Biodegradable hot melt adhesive, 20 g / m 2 Biodegradable membrane, 2 g / m 2 Biodegradable hot melt adhesive and 18 g / m2 PLA nonwoven fabric.

4. The method for preparing a biodegradable surgical gown fabric according to claim 3, characterized in that, The surgical gown fabric is bonded and molded by PLA nonwoven fabric, biodegradable hot melt adhesive and biodegradable film through a 5.5MPa pressure roller.

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