A composite fiber material, its production and use

Abstract

The present application provides a kind of composite fiber material and its preparation method and use.The composite fiber material includes the fiber surface layer, fiber middle layer and fiber bottom layer arranged in sequence;The fiber surface layer, the fiber bottom layer each independently includes the composition of polypropylene, elastomer, softening agent and slip agent;The fiber middle layer includes the composition of polypropylene, elastomer and slip agent.Through the different components of the composition of the fiber surface layer, fiber middle layer and fiber bottom layer are adjusted, obtain three layers of different physical properties of fiber layer;Through the use of three layers of different physical properties of fiber layer, the composite fiber material obtained is smooth, high softness, good tensile property, and easy to process, meet the requirements of medical and health product field to material toughness, softness, comfort.

Description

Technical Field

[0001] This invention belongs to the field of medical and health products technology, specifically relating to a composite fiber material, its preparation method, and its uses. Background Technology

[0002] Nonwoven materials refer to sheet-like materials, webs, or mats made from oriented or randomly arranged fibers through methods such as friction, cohesion, or bonding. Compared with traditional processes, they have advantages such as shorter process flow, stable quality, faster production speed, higher output, lower cost, environmental friendliness, and wider applications. Nonwoven materials are widely used in medical and hygiene fabrics, decorative fabrics, military fabrics, and automotive fabrics. Due to the high requirements in the medical and hygiene field, specific performance requirements are placed on nonwoven materials.

[0003] CN108893869A discloses a functional nonwoven fabric, which is prepared by hot-air bonding of functional fibers with weak acidity and weak hydrophilicity, or by carding weak acidity fibers and weak hydrophilicity fibers into a web. This nonwoven fabric ensures permeability while reducing backflow, and also possesses good antibacterial properties and a comfortable feel. The functional nonwoven fabric achieves this by adding weak acidity and / or weak hydrophilicity oils to the fiber treatment oil before spinning, thereby altering the fiber properties and resulting in uniform functionality, easy storage and transportation, and long-lasting performance. While this functional nonwoven fabric exhibits good permeability and antibacterial properties, its softness, strength, and elongation need further improvement.

[0004] CN213704759U relates to a nonwoven fabric with antistatic properties, comprising a nonwoven base layer, a polypropylene woven fabric layer fixedly connected to the lower surface of the nonwoven base layer, a nano-silver ion fiber layer fixedly connected to the lower surface of the polypropylene woven fabric layer, an antibacterial layer fixedly connected to the upper surface of the nonwoven base layer, and an antistatic layer fixedly connected to the side of the antibacterial layer away from the nonwoven base layer; the nonwoven base layer has multiple evenly distributed longitudinal through holes, and a transverse through hole is formed between two adjacent longitudinal through holes, and the transverse through holes are connected to the longitudinal through holes; vent holes are symmetrically formed on the side of the longitudinal through holes at both ends away from the transverse through holes. The nonwoven fabric not only has good antistatic properties but also good antibacterial and bacteriostatic effects, thereby effectively ensuring the hygiene and safety of the nonwoven fabric in use. However, the nonwoven fabric has slightly poor softness and smoothness.

[0005] CN208576237U discloses a multi-layered, hydrophilic, nonwoven cotton-soft composite fabric, comprising a nonwoven fiber surface layer, a hydrophilic cotton-soft layer, and a nonwoven fiber bottom layer. The nonwoven fiber surface layer has a diffusion layer on top, several breathable holes on top of the diffusion layer, and a permeation layer at the bottom of the breathable holes. The hydrophilic cotton-soft layer has a hydrophilic cotton-soft layer at the bottom, with short fiber overlapping layers at both ends. Several activated carbon fiber layers are disposed inside the hydrophilic cotton-soft layer, and the nonwoven fiber bottom layer is located at the bottom of the hydrophilic cotton-soft layer. The breathable holes increase the breathability and heat dissipation of the composite fabric; the permeation and diffusion layers quickly absorb moisture from the skin surface, keeping the skin dry and improving comfort; and the activated carbon fiber layers inhibit toxic and harmful substances, reduce bacterial growth, and maintain health. While the nonwoven cotton-soft composite fabric has a certain degree of softness, its effectiveness is not significant.

[0006] Therefore, developing a composite fiber material with high softness, smoothness, and excellent tensile properties is an urgent problem to be solved in this field. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a composite fiber material, its preparation method, and its applications. The composite fiber material, composed of three layers of fibers with different physical properties, exhibits excellent softness, smoothness, and tensile strength.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a composite fiber material comprising a fiber surface layer, a fiber intermediate layer, and a fiber bottom layer disposed sequentially; the fiber surface layer and the fiber bottom layer each independently comprise a composition of polypropylene, an elastomer, a softener, and a slip agent; the fiber intermediate layer comprises a composition of polypropylene, an elastomer, and a slip agent.

[0010] In this invention, by adjusting the components in the composition of the fiber surface layer, fiber intermediate layer, and fiber bottom layer, three fiber layers with different physical properties are obtained. The fiber intermediate layer, through the synergistic effect of polypropylene, elastomer, and slip agent, exhibits good flexibility, high elongation, and ease of processing. The fiber surface layer and fiber bottom layer, through the synergistic effect of polypropylene, elastomer, softener, and slip agent, possess good softness and smoothness, making them suitable for skin contact. The composite fiber material obtained by combining these three fiber layers with different physical properties has a smooth surface, high softness, good tensile properties, and is easy to process, meeting the requirements of medical and hygiene products for material toughness, softness, and comfort.

[0011] In this invention, the fineness of the fiber surface layer and the fiber bottom layer is independently 1.5 to 1.7 denier, for example, it can be 1.5 denier, 1.55 denier, 1.6 denier, 1.65 denier, 1.7 denier, etc.

[0012] Preferably, the fineness of the fiber interlayer is 1.6 to 1.8 denier, for example, it can be 1.6 denier, 1.65 denier, 1.7 denier, 1.75 denier, 1.8 denier, etc.

[0013] As a preferred embodiment of the present invention, the mass ratio of polypropylene, elastomer, softener and slip agent in the fiber surface layer is 1:(0.2~0.4):(0.01~0.02):(0.01~0.02), for example, it can be 1:0.2:0.01:0.01, 1:0.3:0.015:0.015, 1:0.4:0.02:0.02, 1:0.2:0.015:0.01, 1:0.3:0.015:0.02, 1:0.25:0.018:0.02, etc.

[0014] Preferably, the mass ratio of polypropylene, elastomer, softener, and slip agent in the fiber bottom layer is 1:(0.3-0.4):(0.02-0.04):(0.007-0.008), for example, it can be 1:0.3:0.02:0.007, 1:0.35:0.025:0.0075, 1:0.4:0.04:0.008, 1:0.37:0.03:0.0075, 1:0.3:0.025:0.008, 1:0.35:0.035:0.008, etc.

[0015] Preferably, the mass ratio of polypropylene, elastomer and slip agent in the fiber interlayer is 1:(0.6-0.7):(0.07-0.08), for example, it can be 1:0.6:0.07, 1:0.65:0.075, 1:0.7:0.08, 1:0.68:0.075, 1:0.6:0.075, 1:0.65:0.08, etc.

[0016] Preferably, the elastomers in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently comprise a polyolefin elastomer.

[0017] In this invention, the polyolefin elastomer is a polyolefin thermoplastic elastomer synthesized using a metallocene catalyst.

[0018] Preferably, the polyolefin elastomer includes any one or a combination of at least two of ethylene-propylene copolymer, ethylene-butene copolymer, or ethylene-octene copolymer.

[0019] Preferably, the elastomer comprises a combination of ethylene-butene copolymer and ethylene-octene copolymer.

[0020] Preferably, the mass ratio of the ethylene-butene copolymer to the ethylene-octene copolymer is 1:(1-2), for example, it can be 1:1, 1:1.5, 1:2, etc.

[0021] In this invention, the elastomer is related to the flexibility of the material. If the content of the elastomer is too small, the improvement on the material performance will not be significant; if the content is too large, it will affect the processing of the material.

[0022] Preferably, the slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include any one or a combination of at least two of fatty amide slip agents, fatty acid slip agents, hydrocarbon slip agents, or alcohol slip agents.

[0023] Preferably, the slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include any one or a combination of at least two of ethylene bis-stearamide, ethylene bis-oleamide, ethylene bis-erucamide, or C10-C20 fatty acids.

[0024] Preferably, the C10 to C20 fatty acids can be, for example, C10, C12, C14, C16, C18, or C20 fatty acids, including but not limited to stearic acid, lauric acid, or palmitic acid.

[0025] Preferably, the softeners in the fiber surface layer and the fiber bottom layer each independently include any one or a combination of at least two of cationic softeners, anionic softeners, nonionic softeners, amphoteric softeners, or silicone softeners.

[0026] Preferably, the softener in the fiber surface layer and the fiber underlayer each independently includes any one or a combination of at least two of monoalkyl dimethyl tertiary amine, dialkyl methyl tertiary amine, trialkyl methyl tertiary amine or dioctadecyl dimethyl ammonium chloride.

[0027] In this invention, the softener and the slip agent are related to the softness and smoothness of the composite fiber material. If the content of softener or slip agent in the fiber surface layer, fiber middle layer or fiber bottom layer is too high, the composite fiber material will have poor toughness; if the content is too low, the surface smoothness and softness of the composite fiber material will be reduced.

[0028] In this invention, the softener and slip agent can reduce the static and dynamic coefficients of friction of polypropylene, giving the composite fiber material softness and surface smoothness, making the composite fiber material easy to process and reducing material adhesion; through the synergistic use of the softener and slip agent, the softness and smoothness of the composite fiber material are improved.

[0029] In a second aspect, the present invention provides a method for preparing the composite fiber material according to the first aspect, the method comprising the following steps:

[0030] The fiber surface layer, fiber middle layer and fiber bottom layer are stacked in sequence and rolled into shape to obtain the composite fiber material.

[0031] Preferably, the rolling forming equipment is a rolling mill.

[0032] Preferably, the linear speed of the rolling mill is 206 to 210 m / min, for example, it can be 206 m / min, 207 m / min, 208 m / min, 209 m / min, 210 m / min, etc.

[0033] Preferably, the pressure of the rolling mill is 4-5 kg / cm². 2 For example, it can be 4kg / cm 2 4.2kg / cm 2 4.4 kg / cm 2 4.6 kg / cm 2 4.8kg / cm 2 5kg / cm 2 wait.

[0034] Preferably, the temperature of the upper roll of the rolling mill is 140-150°C, for example, it can be 140°C, 142°C, 144°C, 146°C, 148°C, 150°C, etc.

[0035] Preferably, the temperature of the lower roll of the rolling mill is 130-140°C, for example, it can be 130°C, 132°C, 134°C, 136°C, 138°C, 140°C, etc.

[0036] Preferably, the temperature of the upper roll oil furnace of the rolling mill is 155-160°C, for example, it can be 155°C, 156°C, 157°C, 158°C, 159°C, 160°C, etc.

[0037] Preferably, the temperature of the lower roll oil furnace of the rolling mill is 148-152°C, for example, it can be 148°C, 149°C, 150°C, 151°C, 152°C, etc.

[0038] Preferably, the preparation methods of the fiber surface layer, fiber intermediate layer, and fiber underlayer each independently include the following steps:

[0039] The materials of the fiber surface layer, fiber middle layer and fiber bottom layer are independently plasticized, extruded through holes and formed into a web to obtain the fiber surface layer, fiber middle layer and fiber bottom layer respectively.

[0040] Preferably, the plasticizing equipment is a screw extruder.

[0041] Preferably, the screw temperature of the screw extruder is 160–240°C. For example, it can be 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 195°C, 200°C, 210°C, 220°C, 230°C, 240°C, etc.

[0042] Preferably, when preparing the fiber surface layer, the screw temperature of the screw extruder is 175-240°C; when preparing the fiber intermediate layer, the screw temperature of the screw extruder is 160-230°C; and when preparing the fiber bottom layer, the screw temperature of the screw extruder is 175-240°C.

[0043] Preferably, the chamber temperature of the screw extruder is 225-260℃, for example, it can be 225℃, 230℃, 235℃, 240℃, 245℃, 250℃, 255℃, 260℃, etc.

[0044] Preferably, when preparing the fiber surface layer, the chamber temperature of the screw extruder is 252-255°C; when preparing the fiber intermediate layer, the chamber temperature of the screw extruder is 225-230°C; and when preparing the fiber bottom layer, the chamber temperature of the screw extruder is 250-252°C.

[0045] Preferably, the pressure roller temperature of the screw extruder is 55-105℃, for example, it can be 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, 85℃, 90℃, 95℃, 100℃, 105℃, etc.

[0046] Preferably, when preparing the fiber surface layer, the pressure roller temperature of the screw extruder is 88-92°C; when preparing the fiber intermediate layer, the pressure roller temperature of the screw extruder is 58-62°C; and when preparing the fiber bottom layer, the pressure roller temperature of the screw extruder is 98-102°C.

[0047] Preferably, the plasticizing and through-hole extrusion process further includes a metering pump delivery step.

[0048] Preferably, the metering pump has a rotational speed of 20 to 30 rpm, for example, 20 rpm, 22 rpm, 24 rpm, 26 rpm, 28 rpm, 30 rpm, etc.

[0049] Preferably, the cooling air velocity of the through-hole extrusion is 880-1120 rpm, for example, it can be 900 rpm, 950 rpm, 1000 rpm, 1050 rpm, 1100 rpm, etc.

[0050] Preferably, the suction speed of the web is 830-1070 rpm, for example, it can be 850 rpm, 900 rpm, 950 rpm, 1000 rpm, 1050 rpm, etc.

[0051] Preferably, when preparing the fiber surface layer, the cooling air velocity is 1080–1120 rpm and the suction velocity is 1030–1070 rpm; when preparing the fiber intermediate layer, the cooling air velocity is 880–920 rpm and the suction velocity is 830–870 rpm; and when preparing the fiber bottom layer, the cooling air velocity is 1060–1100 rpm and the suction velocity is 980–1020 rpm.

[0052] Preferably, the linear speed of the web formation is 211 to 215 meters per minute, for example, it can be 211 meters per minute, 212 meters per minute, 213 meters per minute, 214 meters per minute, 215 meters per minute, etc.

[0053] Preferably, the winding speed of the web is 200-210 m / min, for example, it can be 200 m / min, 202 m / min, 204 m / min, 206 m / min, 208 m / min, 210 m / min, etc.

[0054] As a preferred technical solution of the present invention, the preparation method includes the following steps:

[0055] The fiber surface layer, fiber middle layer, and fiber bottom layer obtained by plasticizing, extruding, and web formation in a screw extruder are subjected to a rolling mill pressure of 4-5 kg / cm². 2 The composite fiber material is obtained by rolling under the conditions of a linear speed of 206-210 m / min, an upper roller temperature of 140-150℃, and a lower roller temperature of 130-140℃.

[0056] Specifically, the preparation method of this invention includes: mixing the materials of the fiber surface layer, fiber middle layer, and fiber bottom layer according to the formula amount, then adjusting the relevant process parameters, heating and melting the material through a screw extruder, and then precisely metering and conveying it to the die head through a metering pump. The melt is uniformly extruded through holes and then cooled by cooling air before entering the drawing device. The yarn is drawn into the drawing device under the negative pressure and forms a fabric surface with the assistance of a suction fan, thus obtaining the fiber surface layer, fiber middle layer, and fiber bottom layer respectively. Finally, the prepared fiber surface layer, fiber middle layer, and fiber bottom layer are hot-rolled together through two preheated rollers to obtain the composite fiber material.

[0057] Thirdly, the present invention provides a medical material, the medical material comprising the composite fiber material described in the first aspect.

[0058] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0059] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0060] In this invention, the composite fiber material obtains three fiber layers with different physical properties by adjusting the components in the composition of the fiber surface layer, fiber middle layer and fiber bottom layer. By using the three fiber layers with different physical properties in combination, the resulting composite fiber material has a smooth surface, high softness, good tensile properties and is easy to process, thus meeting the requirements of the medical and health products field for material toughness, softness and comfort. Detailed Implementation

[0061] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0062] The composite fiber materials provided in the embodiments and comparative examples of the present invention comprise the following components:

[0063] (1) Polypropylene: purchased from Dalian Petrochemical, grade H39S-2;

[0064] (2) Polyolefin elastomers: ethylene-butene copolymer (Dow, grade HM 7487); ethylene-octene copolymer (Dow, grade 9507); ethylene-propylene copolymer (Singapore, grade 7050BL);

[0065] (3) Softener: Brand SF001;

[0066] (4) Slip agent: brand name SL260A.

[0067] Example 1

[0068] This embodiment provides a composite fiber material comprising a fiber surface layer, a fiber intermediate layer, and a fiber bottom layer arranged sequentially. The fiber surface layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.3:0.015:0.015. The fiber intermediate layer contains polypropylene, a polyolefin elastomer, and a slip agent in a mass ratio of 1:0.67:0.075. The fiber bottom layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.37:0.03:0.0075. The polyolefin elastomer in the fiber surface layer, fiber intermediate layer, and fiber bottom layer contains ethylene-butene copolymer and ethylene-octene copolymer in a mass ratio of 1:1. The weight of the composite fiber material is 25g.

[0069] This embodiment also provides a method for preparing the composite fiber material, the specific steps of which are as follows:

[0070] The materials of the fiber surface layer, fiber middle layer, and fiber bottom layer are respectively subjected to plasticization, through-hole extrusion, and web formation to obtain the fiber surface layer, the fiber middle layer, and the fiber bottom layer; then the obtained fiber surface layer, fiber middle layer, and fiber bottom layer are sequentially stacked and rolled to form the material. The process parameters of plasticization, through-hole extrusion, web formation, and rolling are shown in Tables 1 and 2 (S1, S2, and S3 represent the process parameters for preparing the fiber bottom layer, fiber middle layer, and fiber surface layer, respectively).

[0071] Table 1

[0072]

[0073]

[0074] Table 2

[0075]

[0076]

[0077] Example 2

[0078] This embodiment provides a composite fiber material comprising a fiber surface layer, a fiber intermediate layer, and a fiber bottom layer arranged sequentially. The fiber surface layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.2:0.01:0.01. The fiber intermediate layer contains polypropylene, a polyolefin elastomer, and a slip agent in a mass ratio of 1:0.6:0.07. The fiber bottom layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.3:0.02:0.007. The polyolefin elastomer in the fiber surface layer, fiber intermediate layer, and fiber bottom layer contains ethylene-butene copolymer and ethylene-octene copolymer in a mass ratio of 1:1.5. The composite fiber material has a basis weight of 25g.

[0079] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0080] Example 3

[0081] This embodiment provides a composite fiber material comprising a fiber surface layer, a fiber intermediate layer, and a fiber bottom layer arranged sequentially. The fiber surface layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.4:0.02:0.02. The fiber intermediate layer contains polypropylene, a polyolefin elastomer, and a slip agent in a mass ratio of 1:0.7:0.08. The fiber bottom layer contains polypropylene, a polyolefin elastomer, a softener, and a slip agent in a mass ratio of 1:0.4:0.04:0.008. The polyolefin elastomer in the fiber surface layer, fiber intermediate layer, and fiber bottom layer contains ethylene-butene copolymer and ethylene-octene copolymer in a mass ratio of 1:2. The weight of the composite fiber material is 25g.

[0082] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0083] Example 4

[0084] This embodiment provides a composite fiber material, which differs from Example 1 only in that the fiber surface layer contains polypropylene, polyolefin elastomer, softener and slip agent in a mass ratio of 1:0.3:0.03:0.015. All other components and parameters are the same as in Example 1.

[0085] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0086] Example 5

[0087] This embodiment provides a composite fiber material, which differs from Embodiment 1 only in that the fiber bottom layer contains polypropylene, polyolefin elastomer, softener and slip agent in a mass ratio of 1:0.37:0.03:0.01. All other components and parameters are the same as in Embodiment 1.

[0088] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0089] Example 6

[0090] This embodiment provides a composite fiber material, which differs from Example 1 only in that the fiber surface layer contains polypropylene, polyolefin elastomer, softener and slip agent in a mass ratio of 1:0.5:0.015:0.015. All other components and parameters are the same as in Example 1.

[0091] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0092] Example 7

[0093] This embodiment provides a composite fiber material, which differs from Example 1 only in that the fiber interlayer contains polypropylene, polyolefin elastomer and slip agent in a mass ratio of 1:0.8:0.075. All other components and parameters are the same as in Example 1.

[0094] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0095] Example 8

[0096] This embodiment provides a composite fiber material, which differs from Example 1 only in that the polyolefin elastomer in the fiber surface layer, fiber middle layer and fiber bottom layer is an ethylene-butene copolymer, while the other components and proportions are the same as in Example 1.

[0097] This embodiment also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Embodiment 1.

[0098] Comparative Example 1

[0099] This comparative example provides a composite fiber material, which differs from Example 1 only in that the fiber intermediate layer does not contain a slip agent; all other components and proportions are the same as in Example 1.

[0100] This comparative example also provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0101] Comparative Example 2

[0102] This comparative example provides a composite fiber material, which differs from Example 1 only in that there is no softener in the fiber surface layer; all other components and proportions are the same as in Example 1.

[0103] This comparative example provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0104] Comparative Example 3

[0105] This comparative example provides a composite fiber material, which differs from Example 1 only in that the fiber bottom layer does not contain a slip agent; all other components and proportions are the same as in Example 1.

[0106] This comparative example provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0107] Comparative Example 4

[0108] This comparative example provides a composite fiber material, which differs from Example 1 only in that the fiber surface layer contains polypropylene, polyolefin elastomer and slip agent in a mass ratio of 1:0.3:0.3. All other components and parameters are the same as in Example 1.

[0109] This comparative example provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0110] Comparative Example 5

[0111] This comparative example provides a composite fiber material, which differs from Example 1 only in that there is no elastomer in the fiber intermediate layer; all other components and proportions are the same as in Example 1.

[0112] This comparative example provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0113] Comparative Example 6

[0114] This comparative example provides a composite fiber material comprising a fiber surface layer, a fiber intermediate layer, and a fiber bottom layer arranged sequentially. The fiber surface layer contains polypropylene and a softening masterbatch in a mass ratio of 90:10. The fiber intermediate layer contains polypropylene, softening masterbatch, and a polyolefin elastomer in a mass ratio of 70:10:20. The fiber bottom layer contains polypropylene, softening masterbatch, and a polyolefin elastomer in a mass ratio of 60:20:20. The softening masterbatch comprises, by mass percentage, 80% polypropylene, 5% didodecylmethyl tertiary amine, 5% stearic acid, 5% paraffin wax, and 5% emulsifier (Span 80).

[0115] This comparative example provides a method for preparing the composite fiber material, with the specific steps and process parameters being the same as in Example 1.

[0116] Performance testing

[0117] (1) Smoothness: By visual inspection, if the surface of the composite fiber material is smooth and does not shed, it is marked as "qualified"; if the surface is rough or sheds a lot, it is marked as "unqualified".

[0118] (2) Softness: Tested according to GB / T 8942-2002 method;

[0119] The lower the softness value, the better the softness.

[0120] (3) Strength: Tested using ASTM D5053 method;

[0121] (4) Elongation: Tested using ASTM D5053 method.

[0122] The specific test results are shown in Table 3:

[0123] Table 3

[0124] Smoothness Softness strength elongation Example 1 qualified 34 26 120 Example 2 qualified 32 28 117 Example 3 qualified 31 29 122 Example 4 qualified 37 27 123 Example 5 qualified 35 26 118 Example 6 qualified 40 29 128 Example 7 qualified 50 28 118 Example 8 qualified 45 30 115 Comparative Example 1 Unqualified 44 23 112 Comparative Example 2 Unqualified 37 26 109 Comparative Example 3 Unqualified 35 26 110 Comparative Example 4 Unqualified 44 25 113 Comparative Example 5 Unqualified 40 23 108 Comparative Example 6 Unqualified 42 26 113

[0125] As shown in the table above, the composite fiber material provided by the present invention has excellent soft and smooth properties and tensile properties through the synergistic effect of the fiber surface layer, fiber middle layer and fiber bottom layer, and each layer is made of different materials in a specific ratio.

[0126] A comparison of Examples 1-3 with Examples 4-7 shows that the softness and smoothness of the composite fiber material decreases when the amount of each component in the fiber bottom layer or top layer is changed. A comparison of Example 1 with Example 8 shows that the composite fiber material with the best performance is made by using a combination of ethylene-butene copolymer and ethylene-octene copolymer as the elastomer. A comparison of Example 1 with Comparative Examples 1-6 shows that the composite fiber material prepared by using specific components and proportions in the fiber top layer, fiber middle layer and fiber bottom layer of the present invention has excellent performance.

[0127] In summary, the composite fiber material is made by combining multiple fiber layers with different physical properties. Each fiber layer works synergistically with its components to produce a composite fiber material with high softness and smoothness, good tensile properties, and is suitable for the field of medical and health products.

[0128] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite fiber material, characterized in that, The composite fiber material comprises a fiber surface layer, a fiber middle layer, and a fiber bottom layer arranged sequentially. The fiber surface layer and the fiber underlayer each independently comprise a composition of polypropylene, elastomer, softener and slip agent; The fiber interlayer comprises a composition of polypropylene, elastomer, and slip agent; The elastomers in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include polyolefin elastomers; The elastomer comprises a combination of ethylene-butene copolymer and ethylene-octene copolymer; The mass ratio of the ethylene-butene copolymer to the ethylene-octene copolymer is 1:(1~2). The softener in the fiber surface layer and the fiber underlayer each independently includes any one or a combination of at least two of monoalkyl dimethyl tertiary amine, dialkyl methyl tertiary amine, trialkyl methyl tertiary amine or dioctadecyl dimethyl ammonium chloride; The slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include any one or a combination of at least two of ethylene bis-stearamide, ethylene bis-oleamide, ethylene bis-erucamide, or C10-C20 fatty acids.

2. The composite fiber material according to claim 1, characterized in that, The mass ratio of polypropylene, elastomer, softener and slip agent in the fiber surface layer is 1:(0.2~0.4):(0.01~0.02):(0.01~0.02).

3. The composite fiber material according to claim 1, characterized in that, The mass ratio of polypropylene, elastomer, softener and slip agent in the fiber substrate is 1:(0.3~0.4):(0.02~0.04):(0.007~0.008).

4. The composite fiber material according to claim 1, characterized in that, The mass ratio of polypropylene, elastomer and slip agent in the fiber interlayer is 1:(0.6~0.7):(0.07~0.08).

5. A method for preparing a composite fiber material according to any one of claims 1 to 4, characterized in that, The preparation method includes the following steps: The fiber surface layer, fiber middle layer and fiber bottom layer are stacked in sequence and rolled into shape to obtain the composite fiber material.

6. The preparation method according to claim 5, characterized in that, The equipment used for rolling is a rolling mill.

7. The preparation method according to claim 6, characterized in that, The linear speed of the rolling mill is 206~210 m / min.

8. The preparation method according to claim 6, characterized in that, The pressure of the rolling mill is 4~5 kg / cm². 2 .

9. The preparation method according to claim 6, characterized in that, The temperature of the upper roll of the rolling mill is 140~150℃.

10. The preparation method according to claim 6, characterized in that, The temperature of the lower roll of the rolling mill is 130~140℃.

11. The preparation method according to claim 6, characterized in that, The temperature of the upper roller oil furnace of the rolling mill is 155~160℃.

12. The preparation method according to claim 6, characterized in that, The temperature of the lower roll oil furnace of the rolling mill is 148~152℃.

13. The preparation method according to claim 5, characterized in that, The preparation methods for the fiber surface layer, fiber intermediate layer, and fiber underlayer each independently include the following steps: The materials of the fiber surface layer, fiber middle layer and fiber bottom layer are independently plasticized, extruded through holes and formed into a web to obtain the fiber surface layer, fiber middle layer and fiber bottom layer respectively.

14. The preparation method according to claim 13, characterized in that, The plasticizing equipment is a screw extruder.

15. The preparation method according to claim 14, characterized in that, The screw temperature of the screw extruder is 160~240℃.

16. The preparation method according to claim 14, characterized in that, The chamber temperature of the screw extruder is 225~260℃.

17. The preparation method according to claim 14, characterized in that, The temperature of the pressure rollers in the screw extruder is 55~105℃.

18. The preparation method according to claim 13, characterized in that, The process between plasticizing and through-hole extrusion also includes a metering pump delivery step.

19. The preparation method according to claim 18, characterized in that, The metering pump rotates at a speed of 20-30 rpm.

20. The preparation method according to claim 13, characterized in that, The linear speed of the network is 211~215 meters / min.

21. The preparation method according to claim 13, characterized in that, The winding speed of the web is 200~210 meters / min.

22. The preparation method according to claim 5, characterized in that, The preparation method includes the following steps: The fiber surface layer, fiber middle layer, and fiber bottom layer, obtained by plasticizing, extruding through holes, and forming into a web using a screw extruder, are subjected to a rolling mill pressure of 4~5 kg / cm². 2 The composite fiber material is obtained by rolling under the conditions of a linear speed of 206~210 m / min, an upper roller temperature of 140~150℃, and a lower roller temperature of 130~140℃.

23. A medical material, characterized in that, The medical material includes the composite fiber material as described in any one of claims 1 to 4.

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