CN116409034A - Composite fiber material and preparation method and application thereof - Google Patents

Abstract

The invention provides a composite fiber material and its preparation method and application. The composite fiber material includes a fiber surface layer, a fiber middle layer and a fiber bottom layer arranged in sequence; the fiber surface layer and the fiber bottom layer each independently comprise a composition of polypropylene, an elastomer, a softener and a smooth agent; the The fibrous middle layer includes a combination of polypropylene, elastomer and slip agent. By adjusting the different components of the composition of the fiber surface layer, the fiber middle layer and the fiber bottom layer, three fiber layers with different physical properties are obtained; through the combined use of the three fiber layers with different physical properties, the surface of the composite fiber material obtained is Smooth, high softness, good tensile properties, and easy to process, it meets the requirements of toughness, softness, and comfort in the field of medical and sanitary products.

Description

A kind of composite fiber material and its preparation method and application

technical field

The invention belongs to the technical field of medical and sanitary products, and in particular relates to a composite fiber material and its preparation method and application.

Background technique

Nonwoven materials refer to sheets, webs or batts made of oriented or randomly arranged fibers through friction, cohesion or bonding. Compared with the traditional process, it has the characteristics of short process flow, stable quality, fast production speed, high output, low cost, environmental protection and wide application. Non-woven materials are widely used in medical and sanitary cloth, decorative craft cloth, military industry, automobile cloth and so on. Due to the high requirements of medical and health, all aspects of performance of non-woven materials are also required.

CN108893869A discloses a functional non-woven fabric, which is prepared by combing weakly acidic and weakly hydrophilic functional fibers or weakly acidic fibers and weakly hydrophilic fibers into a web and then bonded by hot air. While ensuring the infiltration function, the reverse osmosis rate is reduced, and it has good antibacterial properties and is comfortable to use. The functional nonwoven fabric changes the properties of the fiber by adding weakly acidic oil agent and/or weakly hydrophilic oil agent to the fiber treatment oil agent before weaving, so that the function of the nonwoven fabric is uniform, and it is convenient for storage and transportation. And the performance lasts for a long time. Although the functional nonwoven fabric has good permeability and antibacterial function, its softness, strength and extensibility need to be further improved.

CN213704759U relates to a kind of nonwoven fabric with antistatic function, comprising nonwoven fabric base layer, the lower surface of nonwoven fabric base layer is fixedly connected with polypropylene weaving cloth layer, and the lower surface of polypropylene weaving cloth layer is fixedly connected with nanometer silver ion fiber layer, the upper surface of the nonwoven base layer is fixedly connected with an antibacterial layer, and the side of the antibacterial layer away from the nonwoven base layer is fixedly connected with an antistatic layer; a plurality of uniformly distributed longitudinal through holes are opened in the nonwoven base layer, and adjacent A transverse through hole is opened between the two longitudinal through holes, and the transverse through hole communicates with the longitudinal through hole, and the side of the longitudinal through hole at both ends away from the transverse through hole is symmetrically provided with exhaust holes. The nonwoven fabric not only has good antistatic performance, but also has good antibacterial and antibacterial effects, thereby effectively ensuring the hygiene and safety of the nonwoven fabric. However, the softness and smoothness of the nonwoven fabric are slightly inferior.

CN208576237U discloses a kind of polyphilic multi-layer composite non-woven cotton soft composite fabric, comprising non-woven fiber surface layer, hydrophilic cotton soft layer and non-woven fiber bottom layer, the top of the non-woven fiber surface layer is provided with a diffusion layer, so The top of the diffusion layer is provided with a number of ventilation holes, the bottom of the ventilation holes is provided with a permeable layer, the bottom of the non-woven fiber surface layer is provided with a soft layer of hydrophilic cotton, and the ends of the soft layer of hydrophilic cotton are provided with overlapping short fibers. layer, the hydrophilic cotton soft layer is provided with a number of activated carbon fiber layers, the bottom of the hydrophilic cotton soft layer is provided with a non-woven fiber bottom layer, through the air holes to increase the air permeability and heat dissipation of the composite fabric, through the permeable layer and the diffusion layer Quickly absorb moisture on the skin surface, keep the skin surface dry, improve comfort, inhibit toxic and harmful substances through the activated carbon fiber layer, reduce bacterial growth, and maintain health. Although the nonwoven cotton-soft composite fabric has a certain degree of softness, the effect is not remarkable.

Therefore, it is an urgent problem to be solved in this field to develop a composite fiber material with high softness, smoothness and excellent tensile properties.

Contents of the invention

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a composite fiber material and its preparation method and application. The composite fiber material is composed of three fiber layers with different physical properties, and has excellent softness, smoothness and stretchability.

For reaching this purpose, the present invention adopts following technical scheme:

In a first aspect, the present invention provides a composite fiber material, which includes a fiber surface layer, a fiber middle layer and a fiber bottom layer arranged in sequence; the fiber surface layer and the fiber bottom layer each independently comprise polypropylene, elastomer , a composition of a softener and a slip agent; the fiber middle layer includes a composition of polypropylene, an elastomer, and a slip agent.

In the present invention, by adjusting the components in the composition of the fiber surface layer, the fiber middle layer and the fiber bottom layer, three fiber layers with different physical properties are obtained; wherein, the fiber middle layer is made of polypropylene, elastomer and smooth agent The synergistic effect of the obtained fiber middle layer has good flexibility, high elongation, and is easy to process; the fiber surface layer and the fiber bottom layer are through the synergistic effect of polypropylene, elastomer, softener and smooth agent, and the obtained fiber surface layer and fiber bottom layer have Good softness and smoothness, suitable for contact with the skin; through the compounding of three fiber layers with different physical properties, the composite fiber material obtained has a smooth surface, high softness, good tensile properties, and is easy to process, meeting the requirements of medical and sanitary products Requirements for material toughness, softness and comfort.

In the present invention, the fineness of the fiber surface layer and the fiber bottom layer are each independently 1.5-1.7 denier, such as 1.5 denier, 1.55 denier, 1.6 denier, 1.65 denier, 1.7 denier, etc.

Preferably, the fiber middle layer has a fineness of 1.6-1.8 deniers, for example, 1.6 deniers, 1.65 deniers, 1.7 deniers, 1.75 deniers, 1.8 deniers and the like.

As a preferred technical solution 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 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. .

Preferably, the mass ratio of polypropylene, elastomer, softener and slippery 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.

Preferably, the mass ratio of polypropylene, elastomer and slip agent in the fiber middle layer 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.

Preferably, the elastomers in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include polyolefin elastomers.

In the present invention, the polyolefin elastomer is a polyolefin thermoplastic elastomer synthesized by a metallocene catalyst.

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

Preferably, the elastomer comprises a combination of ethylene-butene copolymers and ethylene-octene copolymers.

Preferably, the mass ratio of the ethylene-butene copolymer to the ethylene-octene copolymer is 1:(1-2), for example, it may be 1:1, 1:1.5, 1:2 and so on.

In the present invention, the elastomer is related to the flexibility of the material. If the content of the elastomer is too small, the improvement of the performance of the material will not be obvious; if the content of the elastomer is too large, the processing of the material will be affected.

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

Preferably, the slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include ethylene bis-stearamide, ethylene bis-oleic acid amide, ethylene bis-erucic acid amide, or C10-C20 fatty acid Any one or a combination of at least two.

Preferably, the C10-C20 fatty acids may be, for example, C10, C12, C14, C16, C18, C20 fatty acids, examples include but not limited to stearic acid, lauric acid or palmitic acid.

Preferably, the softening agent in the fiber surface layer and the fiber bottom layer independently comprises any one or at least two of cationic softening agent, anionic softening agent, nonionic softening agent, amphoteric softening agent or silicone softening agent. combination of species.

Preferably, the softening agent in the fiber surface layer and the fiber bottom layer independently comprises monoalkyl dimethyl tertiary amine, dialkyl methyl tertiary amine, trialkyl methyl tertiary amine or dioctadecyl dimethyl Any one or a combination of at least two of ammonium chlorides.

In the present invention, the softening agent and slippery agent are related to the softness and smoothness of the composite fiber material, the fiber surface layer, the fiber middle layer or the fiber bottom layer contain too much softener or slippery agent, and the composite fiber material has poor toughness; If the content is too small, the surface smoothness and softness of the composite fiber material will be reduced.

In the present invention, the softening agent and slip agent can reduce the static friction coefficient and dynamic friction coefficient of polypropylene, endow the composite fiber material with softness and smooth surface performance, make the composite fiber material easy to process, and reduce material adhesion; The synergistic use of the slip agent improves the softness and smoothness of the composite fiber material.

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

The fiber surface layer, the fiber middle layer and the fiber bottom layer are sequentially stacked and rolled to form the composite fiber material.

Preferably, the roll forming equipment is a rolling mill.

Preferably, the line speed of the rolling mill is 206-210 m/min, such as 206 m/min, 207 m/min, 208 m/min, 209 m/min, 210 m/min, etc.

Preferably, the pressure of the rolling mill is 4-5kg/cm ² , for example, 4kg/cm ² , 4.2kg/cm ² , 4.4kg/cm ² , 4.6kg/cm ² , 4.8kg/cm ² , 5kg/cm 2 cm ² etc.

Preferably, the temperature of the upper roll of the rolling mill is 140-150°C, such as 140°C, 142°C, 144°C, 146°C, 148°C, 150°C, etc.

Preferably, the temperature of the lower roll of the rolling mill is 130-140°C, such as 130°C, 132°C, 134°C, 136°C, 138°C, 140°C, etc.

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

Preferably, the temperature of the lower roll oil furnace of the rolling mill is 148-152°C, such as 148°C, 149°C, 150°C, 151°C, 152°C, etc.

Preferably, the preparation methods of the fiber surface layer, the fiber middle layer and the fiber bottom layer each independently comprise the following steps:

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

Preferably, the plasticizing device is a screw extruder.

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.

Preferably, when preparing the fiber surface layer, the screw temperature of the screw extruder is 175-240°C; when preparing the fiber middle layer, the screw temperature of the screw extruder is 160-230°C; when preparing the fiber bottom layer, the The screw temperature of the screw extruder is 175-240°C.

Preferably, the temperature of the box of the screw extruder is 225-260°C, such as 225°C, 230°C, 235°C, 240°C, 245°C, 250°C, 255°C, 260°C, etc.

Preferably, when preparing the fiber surface layer, the box temperature of the screw extruder is 252-255°C; when preparing the fiber middle layer, the box temperature of the screw extruder is 225-230°C; when preparing the fiber bottom layer , the box temperature of the screw extruder is 250-252°C.

Preferably, the pressure roller temperature of the screw extruder is 55°C to 105°C, such as 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C ℃, 105℃, etc.

Preferably, when preparing the fiber surface layer, the temperature of the pressing roller of the screw extruder is 88-92°C; when preparing the fiber middle layer, the temperature of the pressing roller of the screw extruder is 58-62°C; when preparing the fiber bottom layer , the pressure roller temperature of the screw extruder is 98-102°C.

Preferably, the step of metering pump delivery is also included between the plasticizing and through-hole extrusion.

Preferably, the speed of the metering pump is 20-30 rpm, for example, 20 rpm, 22 rpm, 24 rpm, 26 rpm, 28 rpm, 30 rpm, etc. .

Preferably, the cooling wind speed of the through-hole extrusion is 880-1120 rpm, for example, 900 rpm, 950 rpm, 1000 rpm, 1050 rpm, 1100 rpm, etc.

Preferably, the suction speed of the web forming is 830-1070 revolutions/min, for example, 850 revolutions/min, 900 revolutions/min, 950 revolutions/min, 1000 revolutions/min, 1050 revolutions/min, etc.

Preferably, when preparing the fiber surface layer, the cooling wind speed is 1080-1120 revolutions/min, and the suction speed is 1030-1070 revolutions/min; when preparing the fiber middle layer, the cooling wind speed is 880-920 revolutions/min , the suction speed is 830-870 revolutions/min; when preparing the fiber bottom layer, the cooling wind speed is 1060-1100 revolutions/min, and the suction speed is 980-1020 revolutions/min.

Preferably, the line speed of forming the web is 211-215 m/min, for example, 211 m/min, 212 m/min, 213 m/min, 214 m/min, 215 m/min, etc.

Preferably, the winding speed of the netting 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.

As a preferred technical solution of the present invention, the preparation method comprises the following steps:

The fiber surface layer, fiber middle layer and fiber bottom layer obtained by screw extruder plasticization, through-hole extrusion, and netting are subjected to a pressure of 4-5kg/cm ² and a line speed of 206-210 m/min in the rolling mill. Under the condition that the temperature of the upper roll is 140-150° C., and the temperature of the lower roll is 130-140° C., the composite fiber material is obtained by rolling and forming.

In the present invention, specifically, the preparation method includes: mixing the materials of the fiber surface layer, the fiber middle layer and the fiber bottom layer respectively according to the formula amount, and then adjusting the relevant process parameters, heating and melting the plastic by a screw extruder After melting, it is accurately metered by the metering pump and transported to the die head. The melt is uniformly extruded through the holes, and enters the drafter after being cooled by the cooling air. The filaments are sucked into the drafter under the negative pressure of the drafter. Under the auxiliary action of the suction fan, the cloth surface is formed, and the fiber surface layer, the fiber middle layer and the fiber bottom layer are respectively obtained; finally, the prepared fiber surface layer, the fiber middle layer and the fiber bottom layer are heated by two rollers that have been heated up. rolling and compounding to obtain the composite fiber material.

In a third aspect, the present invention provides a medical material, which includes the composite fiber material described in the first aspect.

The numerical ranges described in the present invention not only include the above-listed point values, but also include any point values between the above-mentioned numerical ranges that are not listed. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the ranges. The specific pip value to include.

Compared with prior art, the beneficial effect of the present invention is:

In the present 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, the fiber middle layer and the fiber bottom layer. Used together, the obtained composite fiber material has smooth surface, high softness, good tensile properties, and is easy to process, meeting the requirements of toughness, softness, and comfort in the field of medical and sanitary products.

Detailed ways

The technical solutions of the present invention will be further described below through specific embodiments. It should be clear to those skilled in the art that the examples are only for helping to understand the present invention, and should not be regarded as specific limitations on the present invention.

The components included in the composite fiber material provided by the embodiments of the present invention and comparative examples are as follows:

(1) Polypropylene: purchased from Dalian Petrochemical, brand H39S-2;

(2) Polyolefin elastomer: ethylene-butene copolymer (Dow, brand HM 7487); ethylene-octene copolymer (Dow, brand 9507); ethylene-propylene copolymer (Singapore, brand 7050BL);

(3) Softener: Brand SF001;

(4) Slip agent: grade SL260A.

Example 1

This embodiment provides a composite fiber material, which includes a fiber surface layer, a fiber middle layer, and a fiber bottom layer arranged in sequence; the fiber surface layer contains polypropylene, polyolefin, and Elastomer, softener and slip agent; the fiber middle layer contains polypropylene, polyolefin elastomer and slip agent with a mass ratio of 1:0.67:0.075; the fiber bottom layer contains a mass ratio of 1:0.37:0.03 : 0.0075 polypropylene, polyolefin elastomer, softener and smooth agent; the polyolefin elastomer in the fiber surface layer, fiber middle layer and fiber bottom layer contains ethylene-butylene copolymer and Ethylene-octene copolymer; the grammage of the composite fiber material is 25g.

This embodiment also provides a preparation method of the composite fiber material, the specific steps are as follows:

The materials of the fiber surface layer, the fiber middle layer and the fiber bottom layer are respectively plasticized, through-hole extruded, and formed into a web to obtain the fiber surface layer, the fiber middle layer and the fiber bottom layer; then the obtained fiber surface layer The material is obtained by sequentially stacking the fiber middle layer and the fiber bottom layer and rolling and forming. The process parameters of plasticization, through-hole extrusion, web forming, and roll forming are shown in Table 1 and Table 2 (S1, S2, and S3 represent the process parameters for preparing the fiber bottom layer, fiber middle layer and fiber surface layer, respectively).

Table 1

Table 2

Example 2

This embodiment provides a composite fiber material, which includes a fiber surface layer, a fiber middle layer, and a fiber bottom layer arranged in sequence; the fiber surface layer contains polypropylene, polyolefin, and Elastomer, softener and slip agent; the fiber middle layer contains polypropylene, polyolefin elastomer and slip agent in a mass ratio of 1:0.6:0.07; the fiber bottom layer contains a mass ratio of 1:0.3:0.02 : 0.007 polypropylene, polyolefin elastomer, softener and smooth agent; the polyolefin elastomer in the fiber surface layer, fiber middle layer and fiber bottom layer contains ethylene-butylene copolymer and ethylene-butylene copolymer with a mass ratio of 1:1.5 Ethylene-octene copolymer; the grammage of the composite fiber material is 25g.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 3

This embodiment provides a composite fiber material, which includes a fiber surface layer, a fiber middle layer, and a fiber bottom layer arranged in sequence; the fiber surface layer contains polypropylene, polyolefin, and Elastomer, softener and slip agent; the fiber middle layer contains polypropylene, polyolefin elastomer and slip agent in a mass ratio of 1:0.7:0.08; the fiber bottom layer contains a mass ratio of 1:0.4:0.04 : 0.008 polypropylene, polyolefin elastomer, softener and smooth agent; the polyolefin elastomer in the fiber surface layer, fiber middle layer and fiber bottom layer contains ethylene-butylene copolymer and ethylene-butylene copolymer with a mass ratio of 1:2 Ethylene-octene copolymer; the grammage of the composite fiber material is 25g.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 4

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 with a mass ratio of 1:0.3:0.03:0.015, Other components and parameters are all the same as in Example 1.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 5

This embodiment provides a composite fiber material, which differs from Example 1 only in that the fiber bottom layer contains polypropylene, polyolefin elastomer, softener and slippery agent with a mass ratio of 1:0.37:0.03:0.01, Other components and parameters are all the same as in Example 1.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 6

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 smooth agent with a mass ratio of 1:0.5:0.015:0.015, Other components and parameters are all the same as in Example 1.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 7

This embodiment provides a composite fiber material, which differs from Embodiment 1 only in that the fiber middle layer contains polypropylene, polyolefin elastomer and slip agent with a mass ratio of 1:0.8:0.075, other components and Parameters are all the same as in Example 1.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Example 8

This embodiment provides a composite fiber material, which differs from Embodiment 1 only in that the polyolefin elastomer in the fiber surface layer, fiber middle layer and fiber bottom layer is an ethylene-butylene copolymer, and other components and proportions All the same as in Example 1.

This embodiment also provides a method for preparing the composite fiber material, the specific steps and process parameters are the same as those in Embodiment 1.

Comparative example 1

This comparative example provides a composite fiber material, which differs from Example 1 only in that there is no slippery agent in the fiber middle layer, and other components and proportions are the same as in Example 1.

This comparative example also provides a preparation method of the composite fiber material, the specific steps and process parameters are the same as those in Example 1.

Comparative example 2

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, and other components and proportions are the same as in Example 1.

This comparative example provides a method for preparing the composite fiber material, and the specific steps and process parameters are the same as those in Example 1.

Comparative example 3

This comparative example provides a composite fiber material, which differs from Example 1 only in that there is no slippery agent in the fiber bottom layer, and other components and proportions are the same as in Example 1.

This comparative example provides a method for preparing the composite fiber material, and the specific steps and process parameters are the same as those in Example 1.

Comparative example 4

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 with a mass ratio of 1:0.3:0.3, and other components and parameters All the same as in Example 1.

This comparative example provides a method for preparing the composite fiber material, and the specific steps and process parameters are the same as those in Example 1.

Comparative example 5

This comparative example provides a composite fiber material, which differs from Example 1 only in that there is no elastomer in the fiber middle layer, and the other components and proportions are the same as those in Example 1.

This comparative example provides a method for preparing the composite fiber material, and the specific steps and process parameters are the same as those in Example 1.

Comparative example 6

This comparative example provides a kind of composite fiber material, and described composite fiber material comprises fiber surface layer, fiber middle layer and fiber bottom layer arranged in sequence; Described fiber surface layer contains the polypropylene and soft masterbatch that mass ratio is 90:10; Fiber middle layer The layer contains polypropylene, soft masterbatch and polyolefin elastomer in a mass ratio of 70:10:20; the fiber bottom layer contains polypropylene, soft masterbatch and polyolefin elastomer in a mass ratio of 60:20:20. The soft master batch comprises 80% of polypropylene, 5% of didodecylmethyl tertiary amine, 5% of stearic acid, 5% of paraffin, and 5% of emulsifier (Span 80) in terms of mass percentage.

This comparative example provides a method for preparing the composite fiber material, and the specific steps and process parameters are the same as those in Example 1.

Performance Testing

(1) Smoothness: through visual observation, if the surface of the composite fiber material is smooth and does not shed hair, it is marked as "qualified"; if the surface is rough or the hair is seriously shed, it is marked as "unqualified";

(2) Softness: Tested by GB/T 8942-2002 method;

Among them, the smaller the softness value, the better the softness;

(3) Strength: Tested by ASTMD5053 method;

(4) Elongation: Tested by ASTM D5053 method.

The specific test results are shown in Table 3:

table 3

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 twenty three 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 twenty three 108 Comparative example 6 unqualified 42 26 113

As can be seen from the above table, the composite fiber material provided by the present invention has excellent softness through the synergistic effect of the fiber surface layer, the fiber middle layer and the fiber bottom layer, and each layer is formed with a specific ratio through different materials. Slippery properties and stretch properties.

From the comparison of Examples 1 to 3 with Examples 4 to 7, it can be seen that when the amount of each component of the fiber bottom layer or the surface layer is changed, the softness and smoothness of the composite fiber material obtained will decrease; it can be seen from the comparison of Example 1 and Example 8 that, The elastomer adopts the combination of ethylene-butene copolymer and ethylene-octene copolymer, and the performance of the composite fiber material is the best; by comparing Example 1 with Comparative Examples 1-6, it can be seen that the fiber surface layer and fiber middle layer described in the present invention The composite fiber material made by using specific components and proportions with the fiber bottom layer has excellent performance.

In summary, the composite fiber material is compounded by multiple layers of fiber layers with different physical properties, and each layer of fiber is synergistically effected by various components, so the composite fiber material obtained has high softness, smoothness, and good tensile properties. , Applicable to the field of medical and sanitary products.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

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 in sequence; The fiber surface layer and the fiber bottom layer each independently comprise a composition of polypropylene, elastomer, softener and slippery agent; The fibrous middle layer comprises a combination of polypropylene, elastomer and slip agent. 2. The composite fiber material according to claim 1, characterized in that, the mass ratio of polypropylene, elastomer, softener and slippery agent in the fiber surface layer is 1: (0.2～0.4): (0.01～0.02 ): (0.01～0.02); Preferably, the mass ratio of polypropylene, elastomer, softener and slippery agent in the fiber bottom layer is 1: (0.3-0.4): (0.02-0.04): (0.007-0.008); Preferably, the mass ratio of polypropylene, elastomer and slip agent in the fiber middle layer is 1:(0.6-0.7):(0.07-0.08). 3. The composite fiber material according to claim 1 or 2, characterized in that, the elastic body in the fiber surface layer, the fiber middle layer, and the fiber bottom layer each independently comprises a polyolefin elastomer; Preferably, the polyolefin elastomer comprises any one or a combination of at least two of ethylene-propylene copolymers, ethylene-butylene copolymers or ethylene-octene copolymers; Preferably, the elastomer comprises a combination of ethylene-butene copolymers and ethylene-octene copolymers; Preferably, the mass ratio of the ethylene-butene copolymer to the ethylene-octene copolymer is 1: (1-2); Preferably, the slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include any of fatty amide slip agents, fatty acid slip agents, hydrocarbon slip agents or alcohol slip agents. one or a combination of at least two; Preferably, the slip agents in the fiber surface layer, fiber middle layer, and fiber bottom layer each independently include ethylene bis-stearamide, ethylene bis-oleic acid amide, ethylene bis-erucic acid amide, or C10-C20 fatty acid any one or a combination of at least two. 4. The composite fiber material according to any one of claims 1 to 3, characterized in that, the softening agents in the fiber surface layer and the fiber bottom layer independently comprise cationic softening agents, anionic softening agents, nonionic softening agents, Any one or a combination of at least two of softeners, amphoteric softeners or silicone softeners; Preferably, the softening agent in the fiber surface layer and the fiber bottom layer independently comprises monoalkyl dimethyl tertiary amine, dialkyl methyl tertiary amine, trialkyl methyl tertiary amine or dioctadecyl dimethyl Any one or a combination of at least two of ammonium chlorides. 5. A preparation method of the composite fiber material according to any one of claims 1 to 4, characterized in that the preparation method comprises the following steps: The fiber surface layer, the fiber middle layer and the fiber bottom layer are sequentially stacked and rolled to form the composite fiber material. 6. the preparation method according to claim 5, is characterized in that, the equipment of described rolling forming is rolling mill; Preferably, the line speed of the rolling mill is 206-210 m/min; Preferably, the pressure of the rolling mill is 4-5kg/cm ² ; Preferably, the temperature of the upper roll of the rolling mill is 140-150°C; Preferably, the temperature of the lower roll of the rolling mill is 130-140°C; Preferably, the temperature of the upper roll oil furnace of the rolling mill is 155-160°C; Preferably, the temperature of the lower roll oil furnace of the rolling mill is 148-152°C. 7. according to the described preparation method of claim 5 or 6, it is characterized in that, the preparation method of described fiber surface layer, fiber middle layer and fiber bottom layer each independently comprises the following steps: The materials of the fiber surface layer, fiber middle layer and fiber bottom layer are independently plasticized, through-hole extruded, and formed into a web to obtain the fiber surface layer, fiber middle layer and fiber bottom layer; Preferably, the plasticizing equipment is a screw extruder; Preferably, the screw temperature of the screw extruder is 160-240°C; Preferably, the box temperature of the screw extruder is 225-260°C; Preferably, the temperature of the pressing roller of the screw extruder is 55-105°C. 8. The preparation method according to claim 7, characterized in that, the step of metering pump delivery is also included between the plasticization and through-hole extrusion; Preferably, the speed of the metering pump is 20-30 rpm; Preferably, the cooling wind speed of the through-hole extruded wire is 880-1120 rpm; Preferably, the suction speed of the netting is 830-1070 revolutions/min; Preferably, the line speed of forming a web is 211-215 m/min; Preferably, the winding speed of the web forming is 200-210 m/min. 9. The preparation method according to any one of claims 5 to 8, characterized in that the preparation method comprises the following steps: The fiber surface layer, fiber middle layer and fiber bottom layer obtained by screw extruder plasticization, through-hole extrusion, and netting are subjected to a pressure of 4-5kg/cm ² and a line speed of 206-210 m/min in the rolling mill. Under the condition that the temperature of the upper roll is 140-150° C., and the temperature of the lower roll is 130-140° C., the composite fiber material is obtained by rolling and forming. 10. A medical material, characterized in that the medical material comprises the composite fiber material according to any one of claims 1-4.