KR100912579B1 - Polypropylene nonwoven fabric for medical use and producing process thereof - Google Patents

Abstract

The present invention relates to a medical polypropylene multilayer nonwoven fabric and a method for manufacturing the same, wherein the medical polypropylene multilayer nonwoven fabric of the present invention is formed between a first spanned and a second spanbonded nonwoven web layer and the first web and the second web. And a third meltblown nonwoven web layer inserted therein and capable of air permeation while preventing the invasion of bacteria, wherein the first and second web spanbond nonwoven layers comprise a melt index (MFR) of 20-80 g / 10 Powder polypropylene, the third web melt blown nonwoven fabric layer is composed of polypropylene having a melt index of 800 ~ 1300g / 10 minutes, the medical polypropylene multilayer nonwoven fabric of the present invention is configured as described above Protect the meltblown layer and provide the desired strength, etc., the central meltblown layer web serves to block bacteria or other contaminants, and Low poly (oxy-1,2 ethylene diyl), alpha- (phenyl) -w-hydroxy compound enhances the penetration of water repellent, oil repellent, and antistatic agent, and is economical, human health and environmental pollution, storage, It is characterized by providing a polypropylene spunbond nonwoven fabric which is stable in use and free from dangers such as fire explosion and excellent in water repellency, oil repellency and antistatic properties.

Nonwoven, spanbond, water repellent, alcohol-alcoholic.

Description

Polypropylene nonwoven fabric for medical use and manufacturing method

1 is a cross-sectional photograph of a medical polypropylene multilayer composite nonwoven fabric prepared according to the present invention,

Figure 2 is a schematic diagram schematically showing an apparatus for producing a medical polypropylene long fiber multilayer composite nonwoven fabric according to the present invention and its manufacturing process.

* Explanation of symbols for the main parts of the drawings

10: raw material storage tank (SILO)

11, 11 ', 11 ": DOSING UNIT

12, 12 ', 12 ": EXTRUDER

13, 13 ', 13 ": SPINPUMP and SPINBEAM

14, 14 ': quenching chamber

15, 15 ': INTERMEDEATE CHANNEL

16, 16 ', 16 ": SUCTION BLOWER

17: SCREEN BELT

18: Calendar (CALENDER)

19: winder

The present invention relates to a medical polypropylene multilayer nonwoven fabric and a method for manufacturing the same, and more particularly, as a barrier nonwoven composite material, such as a surgical gown, a sterile cloth, a surgical patient surgical fabric, which can be used in the medical field, It is made of ultra-fine high density filter to effectively block microorganisms, and it has excellent water and oil repellency and alcohol to prevent blood and body fluids, and it has excellent antistatic property and air permeability. The present invention relates to a medical polypropylene multilayer nonwoven fabric and a method for producing the nonwoven fabric, which can be used to prevent secondary infection in a hospital.

In general, barrier nonwovens have evolved in a way that inhibits the penetration of bacteria and other contaminants and can be used in disposable medical products such as surgical fabrics, disposable gowns, and the like. For example, non-woven fabrics that have undergone water repellent and alcohol-alcohol processing on spunlace non-woven fabrics are used for disposable purposes, such as surgical gowns. Long-term use is likely to be exposed to the above-mentioned patient's body fluids and various contaminants. In addition, by using a spunbond nonwoven fabric made of polypropylene filament as a protective clothing for hospital staff or a drape of surgical patients, the economic and cost burden can be reduced, but the voids between the fibers forming the spunbond nonwoven fabric have a large pathogen, bacteria or There is a problem that the effect of blocking other contaminants such as body fluids of the patient is inferior. In addition, the polypropylene long fiber spanbond nonwoven fabric is hydrophobic and has excellent water repellency, but has an affinity with oils and alcohols, so that it is easily wetted with disinfectants and alcohols used in hospitals, and is left from a contaminant. Furthermore, since synthetic fibers have the property of electrical insulation, they have the property of accumulating static electricity generated by friction with other materials for a long time. For this reason, discharge, aspiration, and repulsion caused by charged static electricity are extremely sensitive to expensive medical equipment, which is a modern electronic device, and may cause various obstacles such as permanent damage. Since these static electricity are generated by friction and contact between materials, it is difficult to prevent the generation itself. Therefore, in order to prevent such static interference of synthetic fibers, it is necessary to remove, neutralize and leak the generated electric charges. As a method of preventing electrostatic disturbances, temperature, humidity control, corona discharge, and the like are frequently used, and some of them are surface-treated with an antistatic agent for fiber, which has an active agent as a main component, as an antistatic method. In the case of the surface treatment, impregnation, spraying, etc. are adopted. The antistatic agent is generally classified into a hygroscopic agent and a surfactant. However, the hygroscopic agent causes a problem of damaging the treatment device. By using this antistatic agent, it also becomes a factor which inhibits the water repellency of hydrophobic polypropylene, and becomes a factor which inhibits water pressure. As such, when the resin is processed using water and oil repellents, a complex function requiring flexibility and antistatic properties for water and oil repelling performance is required, and the importance of prescription design for this is gradually gaining attention. In this case, the softening agent and the antistatic agent used may be remarkably inferior in water repellency depending on which one is selected. In the case of processing with absorbent antistatic agent or softening agent, water repellency and oil repellency are not easily improved. Therefore, in order to improve the effect in the water-repellent process, it is necessary to design a process that does not reduce the water-repellent performance in combination with other drugs for the performance of the water-repellent agent, the method by crosslinking and the complex processing of other functions.

From this point of view, addition of isopropyl alcohol or the like is used in hydrophobic polypropylene nonwoven fabrics because it improves permeability during fluorine-based water repellent processing and has little effect on the water repellency deterioration. A separate recovery device is required due to evaporation when passing through the dryer, and countermeasures against human hazards, fire explosions and environmental pollution are required.

Accordingly, it is an object of the present invention to provide a stable medical polypropylene multilayer nonwoven fabric having desirable barrier properties to inhibit penetration of bacteria and other contaminants.

Another object of the present invention is to produce a micro-fine high-density filter material to effectively block microorganisms, and excellent water and oil repellency, alcohol and alcohol to prevent blood and body fluids perfectly, and excellent antistatic and air permeability, good fit Therefore, it is possible to provide a medical polypropylene multilayer nonwoven fabric having the effect of preventing the secondary infection in the hospital, so that the medical staff can perform the procedure hygienically and comfortably.

Another object of the present invention is to provide a method for easily manufacturing a medical polypropylene spunbond nonwoven fabric having water repellent, oil repellent, alcohol-alcoholic and antistatic properties for the above purposes, to prevent human harmfulness and environmental pollution.

Medical polypropylene multilayer nonwoven fabric of the present invention for achieving the above object;

At least one interposed between the first and second spanbond nonwoven web layers of continuous polypropylene filament fibers and the first and second webs and capable of air permeation while preventing the ingress of bacteria A third meltblown nonwoven web layer comprising a hydrophobic microporous layer, wherein the first and second web spanbond nonwoven layers are polypropylene having a melt index (MFR) of 20 to 80 g / 10 minutes, and the third The web meltblown nonwoven layer is characterized by consisting of polypropylene with a melt index (MFR) of 800-1300 g / 10 min.

According to the present invention, as described above, the formation of the first and second web spanbond nonwoven layers uses a polypropylene chip having a melt index of 20 to 80 g / 10 minutes, and the melt index is 20 g / 10 minutes or less. If the melt viscosity is too high, and as a result, the high-speed rusting property is inferior, conversely, if the melt viscosity is greater than 80g / 10 minutes, the melt viscosity is too low, there is a disadvantage that the stable operation is difficult to drop radioactivity is not preferable.

In addition, the formation of the third melt blown nonwoven web layer uses a polypropylene chip whose main raw material has a melt index of 800 to 1300 g / 10 minutes. If the melt index is 800 g / 10 minutes or less, the melt viscosity is too high, so that high-speed spinning, It is difficult to form microfibers due to difficulty in drawing, and as a result, it is impossible to exert a blocking effect of bacteria or contaminants. On the contrary, when the melt index is 1300 g / 10 minutes or more, the melt viscosity is too low and the pressure in the extruder is low and radioactive. This is disadvantageous because it has a disadvantage.

According to another configuration of the present invention, the first, second and third web is characterized in that the master batch chip (Phthalocyanine blue) high concentration of 1 to 5% by weight is formed by input do.

The blue color of the phthalocyanine blue according to the present invention is a red complementary color of the blood coming from the affected part of the patient during the operation, and the effect of reducing the fatigue of the medical staff by preventing the afterimage of the blood when operating for a long time When it is added to less than 1% by weight, it can not play its role, and when it is added to more than 5% by weight, it acts as a foreign matter in the high-speed spinning, deteriorating the sacrificial property is not preferable.

According to another configuration of the invention, each of the spanbond layers should have a basis weight of at least 10 g / m 2, preferably from about 10 g / m 2 to 30 g / m 2. When the weight of the span bond layer is lower than 10 g / m 2, respectively, it is impossible to protect the meltblown layer at the center, and the strength is low, and form stability cannot be imparted. On the other hand, when the spanbond layer is 30g / m2 or more, the total melt weight of the central meltblown layer to block bacteria or other contaminants is too high, so the touch is not soft and the fit is reduced. The intermediate meltblown layer preferably has a basis weight of at least 5 g / m 2, and when it is 5 g / m 2 or less, it is not preferable because it can not sufficiently exhibit the blocking effect of various bacteria and contaminants.

Method for producing a medical polypropylene multi-layer nonwoven fabric for achieving another object of the present invention;

Melt index (MFR) is 20 ~ 80g / 10min as the main raw material, melted, mixed, homogenized in the extruder, filaments are formed through melt spinning, cooling, and stretching through the mold, and then continuously moved porous The first and second webs, spanbond layers, are formed on the conveyor belt, melted, mixed, and homogenized in an extruder using polypropylene chips having a melt index (MFR) of 800 to 1300 g / 10 minutes as a main raw material, followed by melt spinning through a mold. Stretching the polymer radiated into the high speed concentrated heated air emitted from the side nozzles to form a third web, a meltblown layer on microfibers of 1-5 μm finely-coated yarns, for which spanbond / meltblown / span Laminating with a bond layer;

Thermally bonding the three layers of webs with a calendar to impart shape stability; And

It characterized by consisting of the step of imparting water repellency, oil repellency and antistatic property by immersing, drying, and heat-treating the nonwoven fabric provided with the form safety to the solution mixed with the oil repellent agent and the antistatic agent.

According to another configuration of the invention, the oil repellent is characterized in that the 0.4 to 5.0% by weight of the non-woven fabric weight, based on the solid content, the antistatic agent is applied to 0.1 to 2.0% by weight based on the solid content relative to the non-woven fabric weight.

According to another configuration of the present invention, a perfluoroalkylethyl acrylate-based copolymer is used as the oil repellent, and an anionic sulfonate-based is used as an antistatic agent.

According to still another aspect of the present invention, a poly (oxy-1,2 ethylene diyl), alpha- (phenyl) -w-hydroxy compound is further added to the mixed solution of the oil repellent agent and the antistatic agent. do.

According to another configuration of the present invention, the spinneret is composed of three to six beams (Beam) has a three-layer structure of span bond / melt blown / span bond, the sum of both of the span bond layer is two layers It is composed of four layers, the center melt blown layer is also characterized by consisting of two to four layers.

According to another configuration of the present invention, the nonwoven fabric is characterized in that the weight is 40 ~ 70g / ㎡, the thickness is 0.1 ~ 0.7mm, the bonding rate is manufactured 10 to 30%.

According to another configuration of the present invention, the non-woven fabric produced by the method is characterized in that it is used for medical purposes, such as sterilization of medical equipment such as protective clothing, surgical gowns and drapes for patients, surgical instruments.

Medical nonwoven fabric of the present invention configured as described above is to place and compress the inner fibrous web made of polypropylene meltblown microfiber between the spunbond nonwoven web made of polypropylene filament Spannbond / meltblown / spanbond formed of a multi-layered nonwoven fabric of three-layer structure, so that the spunbond layer on both sides protects the meltblown layer and provides the desired strength, while the central meltblown layer web provides It acts to block contaminants. In addition, in the production of multi-layered nonwovens of the type according to the invention, the respective nonwoven layers are thermally bonded together to form a single fabric composite material, in which the thermal bonding generally causes the nonwoven layer to be heated by a calender. ) And partially melt the inner meltblown layer to form a melt bond that joins the nonwoven layer of the composite material. Thus, if the meltblown layer is not sufficiently melted and fused, the interlayer bonding force of the fabric composite material is weakened. In addition, if the thermal bonding conditions are not correctly controlled, there is a possibility that the thermal bonding region is excessively heated, causing pinholes to destroy the characteristics as a barrier of the inner meltblown layer. Therefore, the thermal bonding conditions actually used are determined in consideration of the characteristics as a barrier that must be able to sufficiently maintain the interlayer bonding force.

In addition, as described above, the polypropylene spunbond / meltblown / spanbond multilayer nonwoven fabrics conventionally manufactured are hydrophobic and water repellent, but are not suitable for hospital medical supplies because they are not oil / oil repellent and antistatic. There was not a problem, in the present invention, water-repellent, oil-repellent processing was performed as described above to solve this problem. In water and oil repellent processing, since the surface of polypropylene fiber has no repulsive force against alcohol and oil components, the water repellent and oil repellent agent is modified on the surface of polypropylene spanbond fiber. It should not be attached and impair other existing properties such as strength, elongation, water pressure, air permeability, etc. In order to impart antistatic properties, the modified raw material is used in the manufacture of the nonwoven fabric or the secondary processing is performed on the finished nonwoven fabric. When the raw material polymer is modified, the active agent and other additives and copolymerization monomers used are high temperature in the polymer manufacturing process. It is easy to be decomposed by, and the antistatic agent dispersed inside the polymer bleeds out to the surface (bleed out) and takes a long time to exert the effect. It was. At this time, the antistatic agent in the solution used is an absorbent product and a hydrophobic product, and if an absorbent surfactant is used, it causes a factor that impairs the water repellency of the hydrophobic polypropylene and damages the processing apparatus. It was possible to manufacture a polypropylene multilayer nonwoven fabric having excellent water repellency and antistatic property, which solved the problem of inhibiting the water repellency and water resistance of polypropylene alone. At this time, since it is not easy to penetrate into the hydrophobic polypropylene nonwoven fabric when the water-repellent, oil-repellent, antistatic agent is used, the penetrant is used. The isopropyl alcohol conventionally used has a problem as described above. As shown in the above configuration, by using poly (oxy-1,2 ethylene diyl), alpha- (phenyl) -w-hydroxy compound as the penetrant, it enhances the penetration effect of water and oil repellent, antistatic agent, economical, It provides a stable action effect free from hazards such as fire and explosion during harmful and environmental pollution, storage and use.

The nonwoven fabric of the present invention prepared as described above serves as a reliable barrier against the liquid of the microfiber melt blown layer when applied for medical purposes, effectively protecting the patient and the surgical team from infectious risks, and between the skin of the patient and the surgical fabric. By forming an air layer isolated on the surface, it has a thermal insulation effect, which can effectively reduce the burden on the surgical team, which is suitable for the technology and function, and can obtain an excellent polypropylene spunbond nonwoven fabric which can surely reduce unnecessary energy and washing cost.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a cross-sectional photograph of a polypropylene multilayer nonwoven fabric of the present invention, that is, a spanbond / meltblown / spanbond multilayer nonwoven fabric, and FIG. 2 schematically shows an apparatus for manufacturing a medical polypropylene multilayer composite nonwoven fabric and a manufacturing process thereof according to the present invention. It is a schematic diagram as shown.

The spunbond polypropylene resin stored in the raw material storage tank 10 is transferred to the raw material weighing devices 11 and 11 'for measuring the raw materials of each of the first and second web spunbond units A and B parts. , 12 '). The color master batch is also transferred to each of the other raw material weighing apparatuses and fed to the extruders 12 and 12 'by a predetermined amount. The supplied main raw material and color master batch are melted and mixed in the extruder and spun through a mold consisting of a plurality of orifices to form a fine thickness of 20-30 μm. The spun polymer is stretched by the pressure of the air that is cooled, solidified and blown from the upper part and the air drawn from the lower part of the conveyor belt by the cooling air injected through the honeycomb-shaped chambers 14 and 14 '. Lamination is carried out at a constant weight on the conveyor belt. The first and second webs must each have a basis weight of at least about 10 g / m 2, preferably from about 10 g / m 2 to 30 g / m 2. If the weight of each of the first and second webs is lower than 10 g / m 2, the central meltblown layer cannot be protected, the strength is low, and morphological stability cannot be imparted. On the other hand, if the weight of each of the first and second webs is more than 30 g / m 2, the total weight of the meltblown layer in the center to block bacteria or other contaminants is too high, so the touch is not soft, and the fit is reduced. do. A meltblown web of polypropylene microfiber may be placed and compressed between the spanbonded nonwoven webs to form a multi-layered nonwoven fabric of three layers. The outer spanbond layer provides the desired strength, etc. to protect the nonwoven, while the central meltblown layer web serves to block bacteria or other contaminants. That is, the main raw material for the melt blown stored in another raw material storage tank (not shown) is transferred to the raw material weighing device 11 "which measures the raw material of the melt blown unit C part for the third web production, and is fed to the extruder 12" by a predetermined amount. Supply. In addition, the color master batch is also transferred to another raw material weighing device and fed to the extruder 12 "by a predetermined amount. The supplied main raw material and the master batch are melted and mixed in the extruder and discharged from the side nozzle when spun through a mold composed of a plurality of orifices. This high velocity heated gas draws the polymer which is spun through a finely-sized orifice, and the stretched polymer is made of finely-coated yarns of 1-5 µm. Form a meltblown layer on the microfiber The third web meltblown layer should have a basis weight of at least 5 g / m 2, and when the basis weight is less than 5 g / m 2, the thickness is thin to block various bacteria or contaminants. The effects of the arrangement of the first, second and third webs can be achieved by working in a device arranged as shown in FIG. A multi-layered composite material consisting of plate bonds, melt blown, and span bonds is formed, and the formed webs are joined by heat and pressure to provide mechanical properties and shape stability. The embossing roll has ˜30%, and the other side is composed of a plate roll having a smooth surface, at which time the pressure applied to the calender is 50 to 100 dyne / cm and the temperature is 130 to 170 ° C. Each nonwoven layer is thermally bonded to each other to form a single fabric composite material In general, the thermal bonding passes the nonwoven layer through a heated calender to partially melt the meltblown layer therein to To form a melt bond that bonds the nonwoven layer.If the meltblown layer is not sufficiently melted and fused, the interlayer bonding force of the composite material is weakened. In addition, if the thermal bonding conditions are not correctly controlled, there is a possibility that the thermal bonding region is excessively heated, causing pin holes to destroy the characteristics as a barrier of the inner meltblown layer. Thermal bonding conditions determine the bonding rate, temperature, and pressure in consideration of the characteristics as a barrier that must be able to sufficiently maintain the interlayer bonding force. The basis weight of the multilayer nonwoven fabric is 30 to 80 gsm, preferably 40 to 70 gsm. If the basis weight is less than 30 gsm, the shape stability and strength is low, and the blocking effect of the pollutant source is lowered. .

In order to impart water repellency, alcohol, oil repellency and antistatic properties of the product produced as described above, oil repellents and antistatic agents are applied. Water repellents are distinguished from broad waterproofing. Water repellent is a process of covering the fibers constituting the textile and knit fabric with a hydrophobic material or by directly bonding hydrophobic groups to the fiber molecules by chemical reaction to prevent the water from getting wet. Since the water repellent is only adhered to the fiber surface in a thin state, the space between the fibers and the yarn remain intact, and gases such as air and steam can pass freely. The water repellency is completely due to the water repellency (hydrophobicity) possessed by the water repellent, and the space between the fiber and the fiber, the yarn and the thread remains in space, so no matter how strong the water repellency, water penetrates into the fiber. This is distinguished from the broad waterproof process. The contact angle with water according to the fiber material is cotton: 59 °, wool: 81 °, rayon: 38 °, nylon: 64 °, polyester: 67 ° acrylic: 53 °, polypropylene: 90 °. When the contact angle is 180 °, the water droplets are completely spherical and do not get wet at all. When the contact angle is 0 °, they are completely wet. Hydrophilic fabrics such as cotton and rayon have a low water repellency during water repellent processing due to the small contact angle of the fiber itself before processing, and good water repellency of polypropylene without water repellent processing as described above. Because of this size.

The necessary conditions for the water-repellent resin are to form a hydrophobic layer with a large contact angle on the surface of the fabric without impairing the breathability of the nonwoven fabric to make the contacted water droplets and to attach the hydrophobic material to the fiber physically and chemically. It should be of good compatibility with other processing agents, has no effect or damage on tactile improvement, no odor, no decrease in strength, no yellowing, no adverse effect on color fastness, no change over time, and no temperature change. It is mentioned that it is not influenced greatly.

The method of classifying water repellents used in textile products is based on the main components of the thermoplastic type, thermosetting molding, and water repellent agent based on the properties of the solvent-based and water-based water-repellent media, the temporary water-repellent agent and permanent water-repellent agent, and the properties of the water-repellent coating. And the effect on the feel of the water repellent. The types of water repellents and their typical compositions include silicones of methyl hydrogen polysiloxane, fluorine, a perfluoroalkyl group-containing copolymer, and waxes of paraffin and zirconium salts. Fatty acid salt, octadecyl ethylene urea of ethylene urea, N-methylol stearamide of pyrrolidinium salt of pyridinium salt of methylol amide Amido methyl pyridinium chloride (Stearamido methyl pyridinium chloride), metal soap-based ammonium stearate (Aluminium stearate) and the like. Factors affecting the processing effect include resin concentration, curing conditions, and type of catalyst. Generally, a film of resin is formed on the fiber surface by heat treatment in the presence of a catalyst to exhibit high water repellency.

Structurally classifying the structure of the water repellent;

Paraffin: C _n H _{2n +1}

Fatty acid amide: C _n H _{2n +1} CONHCH ₂ OH

Alkylethyleneurea: C _n H _{2n +1} NHCON-CH ₂

                                 ＼ ｜

CH ₂

Silicone Water Repellent: CH ₃ CH ₃

                      ｜ ｜

CH ₃ -[-Si-0-] _n -Si-CH ₃

                      ｜ ｜

H CH ₃

Fluorine-based water repellent _{agent: H - [- CH 2 CH-} ] a - [CH 2 CH-] bH

                    ｜ ｜

COOC _n F _{2n +1} Y

And the like.

Paraffin is the oldest water repellent and fatty acid amides, ethylene urea, have introduced reactors to improve durability. All of them are water repellent like paraffins, and perform their performance by alkyl groups of the remaining chains. Silicone-based water repellent is a kind of silicone resin called methyl hydrogen polysiloxane, and it is known that a methyl group is arranged outward on a fiber to form a paraffin-like mechanism and exhibit water repellency. Silicone resins include other dimethylpolysiloxanes and their modified products, which are used only as fabric tactile modifiers (softeners), and may also be used in combination for the purpose of improving the feel of methyl hydrogen polysiloxanes. Fluorinated water repellents are copolymers of Perfluoralkylacrylate. This is characterized by high water repellency and low mold release compared to silicone-based water repellent, but the crucial difference is that it exhibits oil repellency in addition to water repellency. In the present invention, since alcohol and oil repellency are required, the oil repellent is a fluorine-containing compound, which is a product of a perfluoroalkylethylacrylate-based copolymer (solid content of 30%). Processing resin is processed to the fiber in the emulsion state, the composition and formulation in the emulsion preparation can be largely divided into monomer mixture and polymer mixture. In recent years, the method of mixing a monomer and making it react by heat processing is generally used.

In order to improve the durability by treating the water repellent to the fiber material, it is important to improve the adhesion between the fiber and the water repellent agent. The force acting between the fiber and the water repellent can be divided into the intermolecular force (the van der Waals force) and the chemical bond. The intermolecular force is processed in the fiber in the case of the fluorine-based water repellent and exerts water repellency. The fluorine-containing ester group (perfluoro alkyl group) is oriented perpendicular to the fiber and contributes only to water repellency. Is known to contribute to adhesion with the fibers. The former is called a water repeller and the latter is called a gluer. In addition, the fluorocarbon chains with respect to the hydrocarbon chains have a very high interfacial activity, significantly lowering the surface free energy. For this reason, it shows a strong water and oil repelling effect. That is, if the fiber surface is covered with -CF ₃ or -CF ₂ , the surface shows a much larger contact angle than almost the surface covered with -CH ₃ or -CH ₂ . Wet critical surface tension (γc, dyn / cm) (hereinafter referred to as γc) may be used as a method of displaying the water repellency and oil repellency of any solid surface. One of the most basic structures as a fluorine-based water and oil repellent agent for textile treatment is shown below.

-[-CH ₂ CH-] _n-

             ｜

O = COCH ₂ C ₇ F ₁₅

This type is a hydrocarbon type polymer main chain (in this case, a polyacrylic acid type polymer main chain) in which the fluorocarbon chain is stretched in pairs via an ester bond. The above structure is emulsion polymerized with an emulsifier to make an emulsion polymer, γc is 10.4 dyn / cm, polyethylene γc is 31, polyvinyl chloride γc is significantly lower than that of 39. When the fluorine alkyl group is represented by Rf, the terminal of Rf becomes -CF ₃ , which is the most difficult to wet, and thus has strong water and oil repellency. In this case, γ c of -CF ₃ represents 6.0 dyn / cm. As such, fluorine-based water-repellents and oil-repellent agents made mainly of copolymerization of acrylates (in many cases of beta acrylates) with perfluoroalkyl groups as side chains have been reviewed in order to further examine the polymer's own structure and air. The selection of coalescing, the examination of the polymer Tg component related to film forming properties, the strengthening method of adhesion of the vinyl chain as the main chain, the strengthening of the bonding force by the application of an adjuvant, an additive, a crosslinking agent, and the effective use of the crosslinking reaction can be considered. In the case of resin processing using water- and oil-repellent agents, a complex function requiring flexibility and antistatic properties in water-repellent and oil-repellent performance is required, and the importance of prescription design for this is gradually gaining attention. In this case, the softening agent and the antistatic agent used may be remarkably inferior in water repellency depending on which one is selected. In the case of processing with absorbent antistatic agent or softening agent, water repellency and oil repellency are not easily improved. Therefore, in order to improve the effect in the water-repellent process, it is necessary to design a process that does not reduce the water-repellent performance in combination with other drugs for the performance of the water-repellent agent, the method by crosslinking and the complex processing of other functions. As the water repellent is selective absorbent, it must be checked before use, and the liquid supply should be continuously constant so that the liquid level in the resin padder mangle is as constant as possible. The addition of alcohols such as isopropyl alcohol improves the permeability in processing fluorine-based water repellents on hydrophobic polypropylene nonwovens. Alcohols such as isopropyl alcohol, which is used as a penetrant, are widely used in hydrophobic polypropylene nonwoven fabrics because they improve the permeability during fluorine-based water repellent processing and have a low effect on the water repellency. For this purpose, a separate recovery device is required for evaporation when passing through the dryer, and measures for human hazard, fire explosion, and environmental pollution are required. As such a penetrant, there is no potential risk, so that the water-repellent, oil-repellent, antistatic agent is increased by using poly (oxy-1, 2-ethylenediyl) and alpha- (phenyl) -w-hydroxy compounds, and it is economical and human body. Stable production is possible from the dangers such as fire and explosion during harmful and environmental pollution, storage and use.

Antistatic agents should also be hydrophobic, even better for medical use. In this case, if the antistatic agent is used as a general surfactant or a moisture absorbent, the water repellency inherent in polypropylene is lost, the water absorbency is exhibited, and the processing apparatus is damaged by the generation of rust in the processing apparatus. Antistatic agents are mainly classified into anion, cationic, nonionic and amphoteric systems, of which anionic and nonionic are commonly used for antistatic processing. In general, cationic and amphoteric systems are rarely used as components of spinning and spinning emulsions of fibers, but are used as antistatic agents to have the flexibility of the final product. As an anionic system;

Sulfonate type: RSO ₃ Na,

Lactic acid ester salt type: ROSO ₃ Na, ROSO ₃ NH (CH ₂ CH ₂ OH) ₃ Na, RO (CH ₂ CH ₂ O) SO ₃ Na,

등이 있으며, 인산에스테르염형은 대전방지성이 좋으므로 단독, 또는 타 조제와 혼합하여 광범위하게 사용된다. 일반적으로 유산에스테르화, 인산에스테르화된 제품은 대전방지제의 분자 구조중 지방족기의 탄소수, 유산화도, 인산화도 및 친수기의 위치등이 대전방지성능에 큰 상관 관계가 있다. 다음과 같이 대별되는 Cation계는;Phosphate ester salt type:

Etc., since the phosphate ester salt type has good antistatic property, it is widely used alone or in admixture with other agents. In general, lactic acid esterified and phosphate esterified products have a large correlation with antistatic performance in terms of carbon number, lactic acidity, degree of phosphorylation and hydrophilic group of aliphatic groups in the molecular structure of the antistatic agent. The Cation system which is roughly classified as follows;

Amine salt type: RNH ₂ CH ₃ COOH,

Quaternary ammonium salt type: [RCONHC ₃ H ₆ N (CH ₃ ) ₂ CH ₂ CH ₂ OH] X (X = NO ₃ , ClO ₄ ), etc. Although it is used, it contains nitrogen in the molecule, which may cause coloring by oxidation, chlorine bleaching due to chlorine bleaching, and there are problems such as metal ions, contamination and adsorption. Nonionic systems generally exhibit low wettability to fibers and good smoothness to provide uniform wettability to synthetic fibers;

Polyoxyethylene fatty acid ester type: R-COO (CH ₂ CH ₂ O) _n H

Polyoxyethylene alkyl ether type: RO (CH ₂ CH ₂ O) _n H

Polyoxyethylene alkyl phenol ether type, polyoxyethylene alkyl amine type and the like are widely used as spinning emulsion of synthetic fibers.

On the other hand, both ionic systems containing both polar groups of cations and anions in the same molecule have excellent cationic performance and feel, and have a low chlorine barrier. There are betaine (Betaine) type and imidazoline (Imidazoline) type, generally betaine type is used a lot. Durable antistatic agent is excellent in flexibility and heat resistance, there is no change over time, and it can be used in combination with resin processing agent, water repellent, oil repellent without deterioration of dye fastness, and it is required to maintain dust free of dust. Durable antistatic agents are mostly cationic polymers or electrolyte polymers having strong absorption, and examples thereof include polyacrylic acid derivatives, polyvinylamine derivatives, polyamide derivatives, and cationic resins. A method of forming a complex on a fiber by treating a fiber with polybetamethacryloxyethyldiethylmethylammonium sulphate as a polyacrylic acid derivative having a post-treatment with an anionic activator, and dispersing the complex as a nonionic activator. And a method in which a polyamine containing polyethylene oxide is used in combination with a crosslinking agent to treat the fibers, and a three-dimensional network structure insolubilized on the fiber surface by heat treatment.

As described above, medical gowns and drapes used by hospitals to prevent infections of hospitals and patients in hospitals are oil-repellent and water-repellent for the purpose of protecting them from contaminants. It should not be absorbed by antistatic processing for the purpose of protecting against wearing comfort. Therefore, the antistatic agent used in the present invention used a hydrophobic anionic sulfonate type product (solid content 20%). Non-woven fabric was deposited on the bath mixed with oil repellent agent and antistatic agent in a certain ratio and uniformly applied, and dried and heat-set using hot air dryer to produce oil repellent and antistatic nonwoven fabric.

The oil repellent was treated with 0.4 to 5.0 wt% solids based on the weight of the nonwoven fabric and the antistatic agent was treated with 0.1 to 2.0 wt% based on the solids based on the weight of the nonwoven fabric. If the solid content of the oil repellent agent and the antistatic agent to the weight of the nonwoven fabric is 5.0wt% and 2.0wt%, respectively, the surface of the nonwoven fabric becomes excessively hard, and the synergistic effect of the oil repellency and the antistatic property is insufficient even when the amount of the oil used is increased. On the other hand, the oil repellent agent is less than 0.4wt% of solids based on the weight of the nonwoven fabric, and the antistatic agent can not exert its effects at less than 0.1wt% of solids by weight of the nonwoven fabric, respectively, and did not exhibit oil repellency and antistatic properties to be obtained in the present invention.

In addition, the poly (oxy-1,2ethylene diyl) and alpha- (phenyl) -w-hydroxy compounds were treated with 0.1 to 2.0 wt% of solids by weight of the nonwoven fabric so that the preparations could easily penetrate into the nonwoven fabric. If the penetrant is 0.1 wt% or less, or more than 2.0 wt%, the penetration of the crude liquid into the nonwoven fabric is not easy, or the oil repellency performance is lowered due to the excess. The nonwoven fabric soaked in the crude liquid adjusts the pick-up rate by the pressure of Padding Mangle, and a suitable pick-up rate adjusts the pressure so that the solid content remains in the nonwoven fabric. The temperature of the hot air dryer is carried out in a range of 130 to 150 ° C. in drying the nonwoven fabric in a continuous hot air dryer and heat-setting to express the effects of oil repellent and antistatic agent. Below 130 ° C, oil repellency cannot be expressed due to insufficient drying, and productivity is lowered due to excessively low temperature. On the other hand, as the temperature is raised to 150 ° C or higher, near the melting point of polypropylene and near 160 ° C, the nonwoven web causes thermal changes to be fused in the dryer, or surface changes to become very stiff. In this case, fusion of the inner melt blown layer loses its effectiveness as a barrier film, and the fit of the surgical clothing and drapes does not meet the softness.

The following examples and comparative examples further illustrate the present invention in detail, but do not limit the scope of the present invention, and measurement and evaluation of various characteristic values in the examples and comparative examples were performed as follows;

[Assessment Methods]

(1) Tensile strength: Using a tensile strength tester (Instron) measuring equipment in accordance with ASTM D1682-64 method, the specimen width 5cm, 20cm long specimens with a grip interval of 10cm and analyzed under the conditions of a tensile speed of 500mm / min The maximum load was obtained.

(2) Tensile elongation: The elongation rate at the time of maximum tension measured by the method of (1) was calculated | required.

(3) Weight per unit area (weight: g / m 2): Measured according to the method of ASTM D 3776-1985.

(4) Water pressure (mmH₂O): Measured according to the FTMS-191A-5514 low water pressure method (water pressure 60cmH₂O).

(5) Air permeability (cm 3 / cm 2 .s): Measured according to ASTM D 737 Fraser method.

(6) antistatic property;

(A) Friction band voltage was analyzed by KS K 0555-1983 B method with temperature 20 ± 2 ℃, humidity 40 ± 2% RH, 400RPM and cotton cloth.

(B) Surface resistance: Test equipment TOA, SME-8311 D ₁ = 1.96cm D ₂ = 2.41cm Applied voltage 500VOLT, 60 seconds, temperature 20 ± 2 ℃, humidity 40 ± 2% RH, measured by ASTM D 257 method. The antistatic property was determined by the criteria of the following Table 1.

Surface resistance (Ω / ㎝) Daejeon phenomenon Judgment 10 ¹³ <10 ¹³ to 10 ¹² 10 ¹² to 10 ¹⁰ 10 ⁹ to 10 ⁶ 10 ⁶ to 10 ³ Static charge slowly decays after accumulating charging Decrease immediately after charging Almost no charging Bad Bad Bad Good Good

(7) Water repellency, oil repellency (grade): A commercial oil test liquid was used. The nonwoven sample was placed on a flat, horizontal surface. Carefully place 5 small drops, starting from low grade liquids, at least 2 inches apart on the sample and observe for 10 seconds at a 45 ° angle, and if 4 of the 5 drops appear spherical or hemispherical, the test is considered to have passed. The higher grade of liquid was tested as described above and the highest number of grades passed was recorded.

(8) Inhibition rate of permeability: After cutting the test sample to the diameter of 48㎜, put one sheet of filter paper into sterilized Petri dish. After adjusting the concentration so that the concentration of the strain is 3.0-8.0 X 10 ⁵ / mL, 0.5ml of the test solution is dropped on the test sample and placed on a steel disk for easy dispersion. The filter paper is then placed under the test sample to aid in the absorption of the bacterial solution. Used disclosure strains here ATCC 6538 staphylococcus aureus was used. After 24 hours of incubation at 37 ° C. and RH90%, the number of bacteria present on the filter paper is measured.

Example 1

The main raw material polypropylene for the span bond used in the present invention was a melt index (M.F.R) of 35 g / 10 minutes, and 3 wt% of a master batch chip containing a high concentration of phthalocyanine blue was added to express a blue color. Constantly supplied main raw materials and master batch chips are melt kneaded in an extruder to form filaments through spinnerets, then cooled by cooling air and drawn by inhalation air under the belt, and the spunbond first on a continuously driven conveyor belt. A web and two web layers are formed respectively. As a property of the melt blown polypropylene, a melt index (M.F.R) of 1000 g / 10 min was used, and a blue master batch chip was used in the same manner as the span bond layer. The feedstock and master batch, fed in by quantity, are melted and mixed in the extruder and spun through a mold consisting of a plurality of orifices, encountering high velocity concentrated heating air sprayed from the side nozzles. This high speed heated air draws the polymer that is spun through the micro-sized orifices, and the stretched polymers form a meltblown layer of microfiber with fine-grained yarns of 1-5 μm. This third web meltblown layer was composed of two layers, with the sum of the two layers having a basis weight of 8 g / m 2. The first and second webs were made up of at least three layers in total, and formed a spunbond / meltblown / spanbond multilayer nonwoven web having a total weight of 50 g / m 2 including meltblown. The web thus formed was thermocompressed under calender conditions with an emboss roll of 158 ° C., a plate roll of 156 ° C., and a pressure of 78 dyne / cm, to impart morphological stability. The embossing roll used has a bonding rate of 11%. Perfluoroalkylethyl acrylate copolymer (30% solids) oil repellent and p-toluenesulfonic acid sodium salt (p-Toluensulfonic salt) for imparting oil repellency and antistatic properties to a spunbond / meltblown / spanbond multilayer nonwoven fabric acid soudium salt) (40% solids) Poly (oxy-1,2ethylenediyl), alpha- (phenyl) -w to facilitate penetration of the preparation into 40 parts by weight, 10 parts by weight and nonwoven fabric, respectively. 10 parts by weight of a hydroxy compound (30% solids) is mixed with 940 parts by weight of water, and deposited in a bath continuously supplied, so that the linear pressure of the feather mangle is made to be OPU of 1.2% by weight of oil-based oil repellent and 0.2% by weight of antistatic agent. Adjusted. 36 sec / m treatment was carried out in a 135 ° C. hot air dryer in which the nonwoven fabric was continuously moved to prepare a medical polypropylene nonwoven fabric having excellent water repellency, oil repellency, and antistatic properties. Respectively.

Example 2

The total weight of the nonwoven fabric was 60 g / m 2, and the same as in Example 1 except that the temperature of the hot air dryer was adjusted to 145 ° C. Conditions and physical properties are shown in Tables 2 and 3.

Comparative Example 1

It is the same as Example 1 except using 40 weight part of isopropyl alcohol and 910 weight part of water as a penetrant. Conditions and physical properties at this time are shown in Tables 2 and 3.

Comparative Example 2

Using 1 part by weight of poly (oxy-1,2 ethylenediyl), alpha- (phenyl) -w-hydroxy compound (30% solids) and 949 parts by weight of water as the penetrant, the adhesion rate was 0.03% based on the penetrant solids. It is the same as Example 1 except having adjusted. Conditions and physical properties at this time are shown in Tables 2 and 3.

Comparative Example 3

70% by weight of poly (oxy-1,2ethylenediyl), alpha- (phenyl) -w-hydroxy compound (30% solids) and 880 parts by weight of water were used as a penetrant to adjust the adhesion rate to 2.1% based on solids. The same as in Example 1 except for the one. Conditions and physical properties at this time are shown in Tables 2 and 3.

Comparative Example 4

In Example 1, the use and production conditions of the nonwoven main raw material were the same, and oil repellent and antistatic processing were not performed. Conditions and physical properties are shown in Tables 2 and 3.

Nonwoven Production and Processing Conditions Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Melt blown (g / ㎡) 8 8 8 8 8 8 Total weight (g / ㎡) 50 60 50 50 50 50 Oil repellent Kinds (*One) (*One) (*One) (*One) (*One) - Solid content 30 30 30 30 30 - Usage (part by weight) 40 40 40 40 40 - Antistatic agent Kinds (*2) (*2) (*2) (*2) (*2) - Solid content 20 20 20 20 20 - Usage (part by weight) 10 10 10 10 10 - Penetrant Kinds (* 3) (* 3) (*4) (* 3) (* 3) - Solid content 30 30 - 30 30 - Usage (part by weight) 10 10 40 One 70 - PICK UP rate (%) 100 100 100 100 100 - Final solids Oil repellent (%) 1.2 1.2 1.2 1.2 1.2 - Antistatic Agent (%) 0.2 0.2 0.2 0.2 0.2 - Penetrant (%) 0.3 0.3 - 0.03 2.1 - Processing temperature (℃) 135 145 135 135 135 -

   (* 1) Perfluoralkylethyl acrylate copolymer oil repellent.

   (* 2) p-Toluensulfonic acid soudium salt antistatic agent.

   (* 3) poly (oxy-1,2ethylenediyl), alpha- (phenyl) -w-hydroxy compound penetrant.

   (* 4) Isopropyl alcohol.

Non-woven fabric properties after processing Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Nonwoven Weight (g / ㎡) 51 61 51 51 51 51 Strength (kg / 5cm) MD 10 12 11 10 10 11 CD 6 7 6 6 7 7 Elongation (%) MD 54 55 54 54 55 60 CD 63 66 63 63 63 69 Surface resistance 6X10 ⁸ 7X10 ⁸ 6X10 ⁸ 5X10 ¹² 6X10 ⁹ 8X10 ¹⁴ Friction band voltage (V) 190 200 220 290 100 6000 Hydraulic pressure (mmH ₂ O) 540 580 540 450 340 570 Oil repellency (grade) 8 8 6 3 3 One Air permeability (cm 3 / cm 2 / s) 40 35 40 40 40 45 Uniform penetration inhibition rate (%) 99.9 99.9 99.9 99.9 99.9 99.9 Sensory evaluation Water repellency ◎ ◎ ◎ △ △ △ Oil repellent ◎ ◎ ◎ △ △ X Antistatic ◎ ◎ ◎ △ ◎ X SOFT property ◎ ◎ △ ◎ ◎ ◎ Air permeability ◎ ◎ ◎ ◎ ◎ ◎ Uniform permeability ◎ ◎ ◎ ◎ ◎ ◎ Workability (smell) ◎ ◎ △ ◎ ◎ ◎ Comprehensive evaluation ◎ ◎ △ △ △ X

   ◎: Good, △: Normal, X: Poor

Since the medical polypropylene multilayer nonwoven fabric of the present invention configured as described above is formed of a multilayer nonwoven fabric having a spanbond / meltblown / spanbond 3-layer structure, the spunbond layers on both sides protect the meltblown layer and provide desirable strength and the like. The central meltblown layer web acts to block bacteria or other contaminants and by using poly (oxy-1,2ethylene diyl), alpha- (phenyl) -w-hydroxy compounds as penetrants It enhances the penetration of water repellent, oil repellent, and antistatic agent, and is economical, stable from the dangers of human hazards and environmental pollution, fire and explosion during storage and use, and it is reliable for liquid of microfiber melt blown layer when applied for medical use. It acts as a barrier, effectively protecting patients and surgical teams from communicable risks, and between the skin and surgical fabric of patients. By forming an isolated air layer, it provides a warming effect, providing a superior polypropylene spanbonded nonwoven fabric that is suitable for technology and function, effectively reducing the burden on the surgical team while reducing unnecessary energy and washing costs.

Claims (7)

Melt index (MFR) is 20 ~ 80g / 10min as the main raw material, melted, mixed, homogenized in an extruder, filaments are formed through melt spinning, cooling, and stretching through a mold, and then continuously moved. The first and second webs, spanbond layers, are formed on the conveyor belt, melted, mixed, and homogenized in an extruder using polypropylene chips having a melt index (MFR) of 800 to 1300 g / 10 minutes as a main raw material, followed by melt spinning through a mold. And stretching the polymer radiated into the concentrated heated air ejected from the side nozzles to form a third web, a meltblown layer on microfibers of 1-5 µm thick yarn, to the spanbond / meltblown / spanbond layer. Laminating; Thermally bonding the three layers of webs with a calendar to impart shape stability; And The nonwoven fabric imparted to the form safety is deposited, dried, and heat-treated in a solution containing an oil repellent agent, an antistatic agent, and a poly (oxy-1,2 ethylene diyl) and alpha- (phenyl) -w-hydroxy compound to obtain water repellency and water repellency. Method for producing a medical polypropylene multilayer nonwoven fabric, characterized in that consisting of the step of imparting oil and antistatic properties. The method of claim 1, wherein the oil repellent is 0.4 to 5.0% by weight of the nonwoven fabric on a solid basis, and the antistatic agent is 0.1 to 2.0% by weight based on the solid component to the weight of the nonwoven fabric. . The method for producing a medical polypropylene multilayer nonwoven fabric according to claim 1, wherein a perfluoroalkylethyl acrylate copolymer is used as the oil repellent and an anionic sulfonate type is used as an antistatic agent. delete The method of claim 1, wherein the spinneret is composed of three to six beams (Beam) has a three-layer structure of span bond / melt blown / span bond, the sum of both of the span bond layer is two to four layers And a meltblown layer in the center is also composed of two to four layers. The method of claim 1, wherein the nonwoven fabric has a weight of 40 to 70 g / m 2, a thickness of 0.1 to 0.7 mm, and a bonding ratio of 10 to 30%. Nonwoven fabric used for sterilization of medical equipment such as protective clothing, surgical gowns and patient drapes, surgical instruments of the medical staff using the nonwoven fabric prepared by the manufacturing method of claim 1.

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