CN114262987A - Smooth spun-bonded non-woven fabric and production process thereof - Google Patents
Smooth spun-bonded non-woven fabric and production process thereof Download PDFInfo
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Abstract
The application relates to the technical field of non-woven fabrics, in particular to a smooth spun-bonded non-woven fabric and a production process thereof. A smooth spun-bonded non-woven fabric comprises the following raw materials in parts by weight: 80-90 parts of polypropylene, 10-20 parts of fiber, 0.3-2.5 parts of extinction white, 10-15 parts of elastomer and 0.5-2.5 parts of smooth material; the smooth material comprises polyether silicone oil, amido ethoxy quaternary ammonium salt and ester quaternary ammonium salt which are mixed according to the mass ratio of (2-4) to (3-6) to (1-5); the preparation method comprises the following steps: s1, mixing, melting and extruding; s2, filtering; s3, spinning; s4, cooling and shaping; s5, preparing a fiber web; and S6, bonding. The smooth spun-bonded non-woven fabric can improve the flexibility of the non-woven fabric, so that the comfort degree of the non-woven fabric in use is improved; in addition, the production process is simple and the application is wide.
Description
Technical Field
The application relates to the technical field of non-woven fabrics, in particular to a smooth spun-bonded non-woven fabric and a production process thereof.
Background
Nonwoven fabrics are also called nonwoven fabrics, needle punched cottons, needle punched nonwoven fabrics and the like, and can be divided into spunlace nonwoven fabrics, heat seal nonwoven fabrics, pulp air-laid nonwoven fabrics, wet nonwoven fabrics, melt-blown nonwoven fabrics, needle punched nonwoven fabrics and spun-bonded nonwoven fabrics, wherein the spun-bonded nonwoven fabrics have the characteristics of moisture resistance, air permeability, low price, recycling and the like, and can be used in different industries, such as baby diapers, adult incontinence products and the like.
In the related art, the spunbonded nonwoven fabric is a nonwoven fabric formed by extruding and stretching a polymer to form continuous filaments, laying the filaments into a web, and finally forming the web through self-bonding, thermal bonding, chemical bonding or mechanical reinforcement. The formed non-woven fabric is relatively stiff and rough, and has the problem of poor comfort when being used as a baby diaper and an adult incontinence product.
Disclosure of Invention
In order to improve the comparatively crude and hard problem of non-woven fabrics, improve the compliance of non-woven fabrics to comfort level when improving the non-woven fabrics use provides a smooth spunbonded nonwoven and production technology thereof.
The application provides a smooth spunbonded non-woven fabric and a production process thereof, which adopt the following technical scheme:
in a first aspect, the present application provides a smooth spunbonded nonwoven fabric, which adopts the following technical scheme:
a smooth spun-bonded non-woven fabric comprises the following raw materials in parts by weight:
80-90 parts of polypropylene, 10-20 parts of fiber, 0.3-2.5 parts of extinction white, 10-15 parts of elastomer and 0.5-2.5 parts of smooth material; the smooth material comprises polyether silicone oil, amido ethoxy quaternary ammonium salt and ester quaternary ammonium salt which are mixed according to the mass ratio of (2-4) to (3-6) to (1-5).
By adopting the technical scheme, the polypropylene has good plasticity and wear resistance, the extinction white can improve the over-strong optical reflection of the surface in the raw material, so that the surface of the smooth spun-bonded non-woven fabric is in a matte state, and the addition of the elastomer can enable the smooth spun-bonded non-woven fabric to have good elasticity.
In the smooth material, the introduction of polyether group in polyether silicone oil, the action with polypropylene and fiber can increase the flexibility and hygroscopicity of the non-woven fabric, improve the crease resistance of the non-woven fabric and ensure that the whiteness of the non-woven fabric is not easily reduced; the amido ethoxy quaternary ammonium salt can also improve the flexibility of the non-woven fabric, and simultaneously, the non-woven fabric has fluffy feeling and antistatic performance; the esterquat can also improve the softening performance of the non-woven fabric, and in addition, the esterquat has an anti-yellowing effect and can reduce the yellowing influence of the amido ethoxy quaternary ammonium salt on the non-woven fabric. The polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt are compounded, so that the flexibility and the comprehensive performance of the non-woven fabric can be synergistically improved, and the comfort degree of the non-woven fabric in use is improved.
Preferably, the smooth material is a smooth material modified by a surface modifier, and the modifier comprises any one of alkyl methacrylate, methacrylic acid and maleic anhydride.
By adopting the technical scheme, the alkyl methacrylate, the methacrylic acid and the maleic anhydride are all amphoteric polymers, and have both hydrophilic chain segments and hydrophobic chain segments, and the hydrophilic chain segments in the alkyl methacrylate, the methacrylic acid and the maleic anhydride are enriched on the surface of the non-woven fabric during the production and the formation of the non-woven fabric, so that the water absorption capacity of the smooth spun-bonded non-woven fabric is improved; the hydrophobic chain segment is entangled with polypropylene and fiber in the material to anchor, raise the combining strength of the components in the material and raise the mechanical performance of the smooth spun-bonded non-woven fabric.
Preferably, the smooth material also comprises a pore-forming agent and a coupling agent which are mixed according to the mass ratio of (1-4) to (2-7).
By adopting the technical scheme, the coupling agent has the organophilic group and the organophilic group, the organophilic group can form good combination with the polyether silicone oil, the organophilic group can form good combination with the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt, and meanwhile, the coupling agent can also form good combination with the pore-opening agent, and has good dispersibility, so that a uniform and stable smooth material is formed, and the softness and smoothness of the non-woven fabric are improved.
In addition, the pore former can enable the non-woven fabric to have a pore structure, and therefore the moisture absorption of the non-woven fabric is increased. As the internal structure of the smooth material is uniform and stable, once the pore forming agent acts, the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt which are close to the pore forming agent play a role in softening after the non-woven fabric forms a pore structure, so that the pore positions are subjected to softening treatment, the softening degree of the pore positions with pores is improved, and the flexibility of the non-woven fabric is further improved.
Preferably, the smooth material is formed into a core-shell structure, the polyether silicone oil, the amido ethoxy quaternary ammonium salt, the ester quaternary ammonium salt and the coupling agent are contained in an inner core of the smooth material, and the pore-forming agent is contained in an outer shell of the smooth material.
By adopting the technical scheme, when the smooth material is mixed with the rest raw materials of the smooth spun-bonded non-woven fabric, the cell opening agent is contained in the shell of the smooth material, so that a larger contact area can be formed between the cell opening agent and the smooth spun-bonded non-woven fabric, and the cell opening agent can conveniently play a cell opening role. After the pore forming agent acts, the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt are exposed to be subjected to softening treatment, so that the moisture absorption and the flexibility of the smooth spun-bonded non-woven fabric are improved.
Preferably, the smooth material with the core-shell structure comprises the following preparation steps:
(1) taking 2-4 parts of polyether silicone oil, 3-6 parts of amido ethoxy quaternary ammonium salt, 1-5 parts of ester quaternary ammonium salt, 0.1-0.4 part of pore-forming agent and 0.2-0.7 part of coupling agent;
(2) mixing and stirring polyether silicone oil, amido ethoxy quaternary ammonium salt, ester quaternary ammonium salt and 4/5 of the total mass of the coupling agent, drying and grinding into powder to obtain a first mixture;
(3) and stirring and mixing the first mixture and the rest of the coupling agent to obtain a second mixture, and stirring and mixing the second mixture and the pore-opening agent to obtain the smooth material with the core-shell structure.
By adopting the technical scheme, firstly, the preparation of the smooth material raw material is carried out through the step (1), then the polyether silicone oil, the amido ethoxy quaternary ammonium salt, the ester group quaternary ammonium salt and most of the coupling agent are mixed and stirred through the step (2), and the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester group quaternary ammonium salt form good combination under the action of the coupling agent to obtain a first mixture; and (3) enabling the rest part of the coupling agent to form good combination with the first mixture, enabling the rest part of the coupling agent to coat the surface of the first mixture to obtain a second mixture, and enabling the second mixture and the pore-forming agent to be stirred and mixed to enable the pore-forming agent to coat the surface of the second mixture. Because the rest part of the coupling agent is coated on the surface of the first mixture, the coupling agent can be well combined with the pore opening agent, so that the raw materials in the smooth material are well combined, and the smooth material with the core-shell structure is prepared.
Preferably, the fibers comprise milk fibers and viscose fibers mixed according to the mass ratio of (3-4) to (3-7).
By adopting the technical scheme, the milk fiber has better flexibility and good antibacterial performance, and the sanitation and the safety of the smooth spun-bonded non-woven fabric are improved; the viscose fiber has good hygroscopicity and antistatic property. By compounding the two components, the moisture absorption, flexibility, air permeability and comprehensive performance of the smooth spun-bonded non-woven fabric can be synergistically improved.
Preferably, the adhesive further comprises a cross-linking agent, wherein the cross-linking agent comprises any one of N, N-methylene-bisacrylamide and dicumyl peroxide.
By adopting the technical scheme, the N, N-methylene bisacrylamide and the polypropylene, the dicumyl peroxide and the polypropylene can form a bridge bond to form insoluble substances with a three-dimensional network structure and form a uniform and stable structure, so that the strength and elasticity of the smooth spun-bonded non-woven fabric are improved, and the flexibility and the hygroscopicity of the smooth spun-bonded non-woven fabric are further improved.
In a second aspect, the application provides a method for preparing a smooth spunbonded non-woven fabric, which adopts the following technical scheme:
the preparation method comprises the following preparation steps:
s1, mixing, melting and extruding: according to the formula, the raw materials are stirred and mixed, and then are melted and extruded through a screw extruder to obtain a melt in a flowing state;
s2, filtering: filtering the melt, and removing impurities to obtain a filter body;
s3, spinning: conveying the filter body to a spinning die head, and extruding through spinneret orifices of a spinneret plate to obtain nascent fiber trickle; the spinneret plate is provided with 8000-12000 spinneret holes;
s4, cooling and shaping: cooling and pre-stretching the nascent fiber trickle by process cold air at two sides, and performing secondary cooling and stretching shaping treatment by a stretching channel to obtain shaped fiber;
s5, preparing a fiber web: after the shaped fibers are subjected to filament separation through the diffusion channel, the shaped fibers are adsorbed on a conveying belt of a net forming curtain to form a continuous fiber net; the air permeability of the net-forming curtain is 9000-3/m2·d·atm；
S6, bonding: the fiber web is primarily bonded by a pre-pressing roller and finally bonded by a hot rolling mill of a mesh curtain conveying belt to form smooth spun-bonded non-woven fabric; the pressure of the hot rolling mill is 50-70N, and the temperature is 135-145 ℃.
By adopting the technical scheme, firstly, the raw materials of the smooth spun-bonded non-woven fabric are mixed in the step S1 to obtain a fluid solution, and then impurities in the solution are removed in the step S2 to obtain a filter, so that the quality of the smooth non-woven fabric is improved. The filter is then prepared as a nascent fiber stream for temple by step S3, and after cooling and setting by step S4, a set fiber is obtained. And preparing the filamentous shaped fibers into a continuous fiber web in the step S5, and finally bonding the fiber web in the step S6 to obtain the smooth spun-bonded non-woven fabric with high hygroscopicity and high flexibility.
Preferably, the process temperature of the screw extruder is set as follows: the first temperature control zone was 180 ℃, the second temperature control zone was 210 ℃, the third temperature control zone was 230 ℃, the fourth temperature control zone was 235 ℃, the sixth temperature control zone was 235 ℃, and the seventh temperature control zone was 235 ℃.
By adopting the technical scheme, the melting temperature of the polypropylene is 189 ℃, the polypropylene is in a softened state through the first temperature control area, and the polypropylene is in a molten state through gradual temperature rise and forms good combination with other raw materials of the non-woven fabric of the smooth woven non-woven fabric.
Preferably, in the step S3, the temperature of each region of the spinning die head is 235 ℃, and the monomer suction flow rate of the spinning die head is 2000-4000m3H; in step S4, the temperature of the process cold air is 15-20 ℃, the flow rate of the process cold air on the side blowing is 5000-7000m3The flow rate of the process cold air of the lower part of the side blowing is 10000-14000m3/h。
By adopting the technical scheme, the temperature of each area of the spinning die head is 235 ℃, the processing of the nascent fiber trickle is convenient, and the nascent fiber trickle is cooled and shaped by cold air in a lower temperature range and a larger cold air flow. The air speed of the process cold air at the lower part of the cross air blow is larger than the flow of the process cold air at the upper part of the cross air blow, so that the nascent fiber trickle is not easy to fall off in the cooling process.
In summary, the present application has the following beneficial effects:
1. the smooth material is added into the smooth spun-bonded non-woven fabric, and the introduction of the polyether group in the polyether silicone oil and the action of the polypropylene and the fiber can increase the flexibility and the hygroscopicity of the non-woven fabric, improve the crease resistance of the non-woven fabric and ensure that the whiteness of the non-woven fabric is not easily reduced; the amido ethoxy quaternary ammonium salt can also improve the flexibility of the non-woven fabric, and simultaneously, the non-woven fabric has fluffy feeling and antistatic performance; the esterquat can also improve the softening performance of the non-woven fabric, and in addition, the esterquat has the anti-yellowing effect and can reduce the yellowing influence of the amido ethoxy quaternary ammonium salt on the non-woven fabric; the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt are compounded, so that the flexibility and the comprehensive performance of the non-woven fabric can be synergistically improved.
2. In the application, a pore-forming agent and a coupling agent are preferably added into the smooth material, the coupling agent has an organophilic group and an organophilic group, the organophilic group can form good combination with polyether silicone oil, the organophilic group can form good combination with amido ethoxy quaternary ammonium salt and ester quaternary ammonium salt, and the coupling agent can also form good combination with the pore-forming agent, and has good dispersibility, so that a uniform and stable smooth material is formed, and the softness and softness of the non-woven fabric are improved; in addition, the pore opening agent can enable the non-woven fabric to have a pore structure, so that the moisture absorption of the non-woven fabric is increased; as the internal structure of the smooth material is uniform and stable, once the pore forming agent acts, the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt which are close to the pore forming agent play a role in softening after the non-woven fabric forms a pore structure, so that the pore positions are subjected to softening treatment, the softening degree of the pore positions with pores is improved, and the flexibility of the non-woven fabric is further improved.
3. According to the method, firstly, after raw materials of the smooth spun-bonded non-woven fabric are mixed in the step S1, a fluid solution can be obtained, then impurities in the solution are removed in the step S2, a filter body is obtained, and the quality of the smooth non-woven fabric is improved. The filter is then prepared as a nascent fiber stream for temple by step S3, and after cooling and setting by step S4, a set fiber is obtained. And preparing the filamentous shaped fibers into a continuous fiber web in the step S5, and finally bonding the fiber web in the step S6 to obtain the smooth spun-bonded non-woven fabric with high hygroscopicity and high flexibility.
Detailed Description
The present application will be described in further detail with reference to examples.
In the examples of the present application, the drugs used are shown in table 1:
table 1 pharmaceutical products according to embodiments of the present application
Preparation example of smooth Material
Preparation example 1: the preparation example is prepared by the following method:
2kg of polyether silicone oil, 3kg of amido ethoxy quaternary ammonium salt and 1kg of ester quaternary ammonium salt are mixed and stirred to obtain the smooth material.
Preparation example 2: the preparation example is prepared by the following method:
3kg of polyether silicone oil, 4.5kg of amido ethoxy quaternary ammonium salt and 3kg of ester quaternary ammonium salt are mixed and stirred to obtain the smooth material.
Preparation example 3: the preparation example is prepared by the following method:
4kg of polyether silicone oil, 6kg of amido ethoxy quaternary ammonium salt and 5kg of ester quaternary ammonium salt are mixed and stirred to obtain the smooth material.
Preparation example 4: the difference between the preparation example and the preparation example 2 is that:
the smooth material of the preparation example is a smooth material modified by a modifier, and the preparation steps of the preparation example are as follows:
(1) taking 3kg of polyether silicone oil, 4.5kg of amido ethoxy quaternary ammonium salt and 3kg of ester quaternary ammonium salt, mixing and stirring to obtain a primary mixed material;
(2) mixing and stirring the primary mixed material and 0.2kg of modifier to obtain a smooth material; the modifier is alkyl methacrylate.
Preparation example 5: the difference between the preparation example and the preparation example 4 is that:
this preparation example used methacrylic acid instead of the alkyl methacrylate in preparation example 4 as a modifier.
Preparation example 6: the difference between the preparation example and the preparation example 4 is that:
this preparation example used maleic anhydride instead of the alkyl methacrylate in preparation example 4 as the modifier.
Preparation example 7: the difference between this preparation and preparation 6 is that:
the smooth material of the preparation example also comprises a pore-forming agent and a coupling agent, and the preparation method of the preparation example comprises the following steps:
(1) mixing and stirring 3kg of polyether silicone oil, 4.5kg of amido ethoxy quaternary ammonium salt, 3kg of ester quaternary ammonium salt, 0.1kg of pore-forming agent and 0.2kg of coupling agent to obtain a primary mixing material;
(2) mixing and stirring the primary mixed material and 0.2kg of modifier to obtain a smooth material; the modifier is maleic anhydride.
Preparation example 8: the difference between this preparation and preparation 7 is that:
the mass of the cell opener in this preparation example was 0.25kg, and the mass of the coupling agent was 0.45 kg.
Preparation example 9: the difference between this preparation and preparation 7 is that:
the mass of the cell opener in this preparation example was 0.4kg, and the mass of the coupling agent was 0.7 kg.
Preparation example 10: the difference between this preparation and preparation 8 is that:
the smooth material of the preparation example is formed into a core-shell structure, and the smooth material of the core-shell structure is prepared by adopting the following method:
(1) weighing 3kg of polyether silicone oil, 4.5kg of amido ethoxy quaternary ammonium salt, 3kg of ester quaternary ammonium salt, 0.25kg of pore-forming agent and 0.45kg of coupling agent;
(2) mixing and stirring polyether silicone oil, amido ethoxy quaternary ammonium salt, ester quaternary ammonium salt and 4/5 of the total mass of the coupling agent, drying and grinding into powder to obtain a first mixture;
(3) and stirring and mixing the first mixture and the rest of the coupling agent to obtain a second mixture, and stirring and mixing the second mixture and the pore-opening agent to obtain the smooth material with the core-shell structure.
Examples of preparation of fibers
Preparation example 11: the preparation example is prepared by the following method:
30kg of milk fiber and 30kg of viscose fiber are weighed, mixed and stirred to obtain the fiber.
Preparation example 12: the preparation example is prepared by the following method:
35kg of milk fiber and 50kg of viscose fiber are weighed, mixed and stirred to obtain the fiber.
Preparation example 13: the preparation example is prepared by the following method:
40kg of milk fiber and 70kg of viscose fiber are weighed, mixed and stirred to obtain the fiber.
Examples
Example 1
A smooth spun-bonded non-woven fabric is prepared from the following raw materials:
80kg of polypropylene, 10kg of fibers, 0.3kg of delustering white, 10kg of elastomer and 0.5kg of smooth material; the fiber is milk fiber; the smooth material is the smooth material of preparation example 1.
A preparation method of a smooth spun-bonded non-woven fabric comprises the following preparation steps:
s1, mixing, melting and extruding: according to the formula, the raw materials are sucked into a mixer, stirred and mixed, then conveyed into a screw extruder, and melted and extruded through the screw extruder to obtain a melt in a flowing state; the process temperature of the screw extruder is set as follows: the first temperature control area is 180 ℃, the second temperature control area is 210 ℃, the third temperature control area is 230 ℃, the fourth temperature control area is 235 ℃, the sixth temperature control area is 235 ℃, and the seventh temperature control area is 235 ℃;
s2, filtering: filtering the melt by a melt filter, and removing impurities to obtain a filter body; the temperature of the melt filter is controlled to be 235 ℃, and the filtering precision of the melt filter is 200 meshes;
s3, spinning: conveying the filter body to a spinning die head through a metering pump, and extruding through spinneret orifices of a spinneret plate to obtain nascent fiber trickle; the spinneret plate is provided with 8000-12000 spinneret holes; the temperature of the metering pump is 235 ℃; the temperature of each area of the spinning die head is 235 ℃, and the monomer suction flow of the spinning die head is 2000m3/h；
S4, cooling and shaping: cooling and pre-stretching the nascent fiber trickle by process cold air at two sides, and performing secondary cooling and stretching shaping treatment by a stretching channel to obtain shaped fiber; the temperature of the process cold air is 15 ℃, and the flow of the process cold air on the upper part of the side blowing is 5000m3H, the flow of process cold air at the lower part of the side blowing is 10000m3/h。
S5, preparing a fiber web: after the shaped fibers are subjected to filament separation through the diffusion channel, the shaped fibers are adsorbed on a conveying belt of a net forming curtain to form a continuous fiber net; the air permeability of the net forming curtain is 9000cm3/m2·d·atm；
S6, bonding: the fiber web is primarily bonded by a pre-pressing roller and finally bonded by a hot rolling mill of a mesh curtain conveying belt to form smooth spun-bonded non-woven fabric; the pressure of the hot rolling mill is 50N, and the temperature is 135 ℃.
Example 2: the present embodiment is different from embodiment 1 in that:
a smooth spun-bonded non-woven fabric is prepared from the following raw materials:
85kg of polypropylene, 15kg of fibers, 1.4kg of delustering white, 12.5kg of elastomer and 1.5kg of smooth material; the fiber is milk fiber; the smooth material is the smooth material of preparation example 1.
Example 3: the present embodiment is different from embodiment 1 in that:
a smooth spun-bonded non-woven fabric is prepared from the following raw materials:
90kg of polypropylene, 20kg of fibers, 2.5kg of delustering white, 15kg of elastomer and 2.5kg of smooth material; the fiber is milk fiber; the smooth material is the smooth material of preparation example 1.
Example 4: the present embodiment is different from embodiment 2 in that:
in step S3, the spinneret plate is a spinneret plate having 10000 spinneret holes; the monomer suction flow of the spinning die head is 3000m3/h；
In step S4, the temperature of the process cold air is 17.5 ℃, and the flow rate of the process cold air on the side blowing air is 6000m3H, the flow of the process cold air at the lower part of the side blowing is 12000m3/h。
In step S5, the air permeability of the net forming curtain is 10000cm3/m2·d·atm；
In step S6, the hot rolling mill pressure is 60N and the temperature is 140 ℃.
Example 5: the present embodiment is different from embodiment 2 in that:
in step S3, the spinneret plate is a spinneret plate having 12000 spinneret holes; the monomer suction flow of the spinning die head is 4000m3/h；
In step S4, the temperature of the process cold air is 20 ℃, and the flow rate of the partial process cold air on the side blowing is 7000m3The flow rate of process cold air at the lower part of the side blowing is 14000m3/h。
In step S5, the air permeability of the net forming curtain is 11000cm3/m2·d·atm；
In step S6, the hot rolling mill was at a pressure of 70N and a temperature of 145 ℃.
Example 6: the present embodiment is different from embodiment 3 in that:
in step S1, the process temperature of the screw extruder is set as: the first temperature control zone was 100 deg.C, the second temperature control zone was 150 deg.C, the third temperature control zone was 160 deg.C, the fourth temperature control zone was 180 deg.C, the sixth temperature control zone was 180 deg.C, and the seventh temperature control zone was 180 deg.C.
Example 7: the present embodiment is different from embodiment 3 in that:
in step S1, the process temperature of the screw extruder is set as: the first temperature control zone was 250 deg.C, the second temperature control zone was 300 deg.C, the third temperature control zone was 320 deg.C, the fourth temperature control zone was 350 deg.C, the sixth temperature control zone was 350 deg.C, and the seventh temperature control zone was 350 deg.C.
Example 8: the present embodiment is different from embodiment 3 in that:
in step S3, the temperature of each area of the spinning die head is 180 ℃, and the monomer suction flow of the spinning die head is 1500m3/h；
In step S4, the temperature of the process cold air is 10 ℃, and the flow rate of the process cold air on the side blowing air is 4000m3The flow rate of partial process cold air of the side blowing is 8000m3/h。
Example 9: the present embodiment is different from embodiment 3 in that:
in step S3, the temperature of each region of the spinning die head is 350 ℃, and the monomer suction flow of the spinning die head is 2500m3/h；
In step S4, the temperature of the process cold air is 20 ℃, and the flow rate of the process cold air on the side blowing is 6000m3H, the flow of the process cold air at the lower part of the side blowing is 12000m3/h。
Examples 10 to 18: examples 10-18 differ from example 4 in the smooth material used, as shown in table 2 below:
table 2 selection of the lubricious materials in example 4 and examples 10-18
Example 19: this embodiment is different from embodiment 18 in that:
this example used the fiber of preparation 11 in place of the milk fiber of example 18.
Example 20: this embodiment is different from embodiment 18 in that:
this example used the fiber of preparation 12 in place of the milk fiber of example 18.
Example 21: this embodiment is different from embodiment 18 in that:
this example used the fiber of preparation 13 in place of the milk fiber of example 18.
Example 22: the present embodiment is different from embodiment 20 in that:
in the raw material of the smooth spunbonded nonwoven fabric of this embodiment, it further includes: 0.2kg of a cross-linking agent, which is N, N-methylenebisacrylamide.
Example 23: the present embodiment is different from embodiment 22 in that:
in this example, dicumyl peroxide was used instead of N, N-methylenebisacrylamide used in example 21 as a crosslinking agent.
Comparative example
Comparative example 1: this comparative example differs from example 2 in that:
the raw materials of this comparative example were not added with a smoothing material.
Performance test
Compliance detection method
The fluffy softness is mainly reflected by subjective functions such as touch feeling for the user. Since it is not certain whether the slight differences measured by the instrument are noticeable to the consumer, the subjective touch test scoring method was chosen for softness testing. Selecting professional panelists (20 persons) to carry out subjective touch test, carrying out softness sequencing on the smooth woven non-woven fabric, scoring successively according to the sequencing, wherein the softness is the best in the highest score of 7, the softness is the worst in the lowest score of 1, the softness can be parallel, and finally, summing the scoring values of the 20 persons and taking an average value.
Method for detecting moisture absorption
The time to absorb moisture t is recorded when the dry side of the nonwoven fabric has disappeared, according to standard astm d665101 test method for the rate of absorption of water by nonwoven fabrics.
TABLE 3 Performance test Table
Examples 1-3 were compared, with examples 1-3 differing in the formulation of the smooth spunbond nonwoven material, and example 2 had the best formulation of the material due to the greatest flexibility and shortest wicking time of example 2.
Example 2, example 4 and example 5 were compared, and example 2, example 4 and example 5 differed in the process conditions parameters for making a smooth spunbond nonwoven, which was the best in example 4 due to the greatest flexibility value and the shortest wicking time of example 4.
Examples 6-7 are compared with example 3, examples 6-9 differing from example 3 in the process temperature setting of the screw extruder. The screw extruder of example 3 had the best process temperature setting due to the greatest compliance and the shortest moisture absorption time, which further illustrates the preferred process temperature setting range for the screw extruder of this embodiment.
Examples 8 to 9 were compared with example 3, and examples 6 to 9 were different from example 3 in the temperature of each region of the spinning die in step S3, the suction flow rate of the monomer of the spinning die in step S3, the temperature of the process cold wind in step S4, the flow rate of the process cold wind on the side-blown air in step S4, and the flow rate of the process cold wind on the lower portion of the side-blown air in step S4. This is illustrated to be preferred because example 3 has the greatest compliance value and the shortest absorption time.
Comparing examples 10-11 with example 4, examples 10-11 differ from example 4 in the ratio of the raw materials used to make the lubricating material, and example 10 provides the best ratio of the raw materials used to make the lubricating material because of the greatest compliance and the shortest moisture absorption time.
Examples 12-14 are compared with example 4, and examples 12-14 differ from example 4 in that the smooth materials of examples 12-14 are modified smooth materials. Since examples 12-14 have higher flexibility values and shorter moisture absorption times than example 4, it is demonstrated that the hydrophilic segments in alkyl methacrylate, methacrylic acid and maleic anhydride are concentrated on the surface of the nonwoven during the production and formation of the nonwoven, thereby increasing the water absorption capacity of the smooth spunbond nonwoven. In addition, example 14 has the greatest compliance value and the shortest absorption time, and therefore maleic anhydride is the best modifier in this embodiment.
Comparing example 15 with example 14, example 15 is different from example 14 in that the smooth material in example 15 further comprises a cell opening agent and a coupling agent, and since the flexibility value of example 15 is greater than that of example 14 and the moisture absorption time is shorter than that of example 14, it is shown that the coupling agent has an organophilic group and an organophilic group, the organophilic group can form good combination with polyether silicone oil, the organophilic group can form good combination with amido ethoxy quaternary ammonium salt and ester quaternary ammonium salt, and the coupling agent can form good combination with the cell opening agent, and has good dispersibility, so that a uniform and stable smooth material is formed, and the flexibility of the non-woven fabric is improved. In addition, the pore former can enable the non-woven fabric to have a pore structure, and therefore the moisture absorption of the non-woven fabric is increased.
Examples 15-17 were compared, except that examples 15-17 were different in the ratio of the cell opening agent to the coupling agent, and examples 15-17 were the same in flexibility value, but example 16 had the shortest moisture absorption time, and thus example 16 had the best ratio of the cell opening agent to the coupling agent.
Comparing example 18 with example 16, example 18 is different from example 16 in that the smooth material of example 18 is a core-shell structure smooth material, and because example 18 has a large flexibility value and a short moisture absorption time, it is described that when the smooth material is mixed with the rest of raw materials of the smooth spunbond nonwoven fabric, the cell opening agent can form a large contact area with the smooth spunbond nonwoven fabric because the cell opening agent is contained in the shell of the smooth material, so that the cell opening agent can conveniently exert a cell opening effect. After the pore former acts, the polyether silicone oil, the amido ethoxy quaternary ammonium salt and the ester quaternary ammonium salt are exposed to be subjected to softening treatment, so that the moisture absorption and flexibility of the smooth spun-bonded non-woven fabric are improved.
Comparing examples 19-21 with example 18, examples 19-21 differ from example 18 in that the fibers of examples 19-21 were formed from milk fibers and viscose fibers, and that the fibers of examples 19-21 were formed from milk fibers and viscose fibers, which are preferred due to the greater flexibility values and shorter moisture absorption times of examples 19-21. In addition, the difference between examples 19-21 is that the ratio of milk fiber to viscose fiber is different, and the ratio of milk fiber to viscose fiber is optimal in example 20 because of the maximum flexibility value and the shortest moisture absorption time of example 20.
Comparing examples 22-23 with example 20, examples 22-23 differ from example 20 in that examples 22-23 further include a cross-linking agent, and since examples 22-23 have a greater flexibility value than example 20 and a shorter moisture absorption time than example 20, it is demonstrated that bridges can be formed between N, N-methylenebisacrylamide and polypropylene, dicumyl peroxide and polypropylene, forming insoluble substances in a three-dimensional network structure, forming a uniform and stable structure, and further improving the flexibility and moisture absorption of a smooth and square-bonded nonwoven fabric.
Finally, comparative example 1 was compared to example 2, with comparative example 1 differing from example 2 in that no slip material was added to comparative example 1. Example 2, which has a higher compliance value than comparative example 1 and a shorter moisture absorption time than comparative example 1, illustrates the better embodiment of the present application.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The smooth spun-bonded non-woven fabric is characterized by comprising the following raw materials in parts by weight:
80-90 parts of polypropylene, 10-20 parts of fiber, 0.3-2.5 parts of extinction white, 10-15 parts of elastomer and 0.5-2.5 parts of smooth material; the smooth material comprises polyether silicone oil, amido ethoxy quaternary ammonium salt and ester quaternary ammonium salt which are mixed according to the mass ratio of (2-4) to (3-6) to (1-5).
2. A smooth spunbond nonwoven fabric as claimed in claim 1, wherein: the smooth material is modified by a surface modifier, and the modifier comprises any one of alkyl methacrylate, methacrylic acid and maleic anhydride.
3. A smooth spunbond nonwoven fabric as claimed in claim 1, wherein: the smooth material also comprises a pore-forming agent and a coupling agent which are mixed according to the mass ratio of (1-4) to (2-7).
4. A smooth spunbond nonwoven fabric according to claim 3, wherein: the smooth material is formed into a core-shell structure, the polyether silicone oil, the amido ethoxy quaternary ammonium salt, the ester quaternary ammonium salt and the coupling agent are contained in the core of the smooth material, and the pore-forming agent is contained in the shell of the smooth material.
5. A smooth spunbond nonwoven fabric according to claim 4, characterized in that: the smooth material with the core-shell structure comprises the following preparation steps:
(1) taking 2-4 parts of polyether silicone oil, 3-6 parts of amido ethoxy quaternary ammonium salt, 1-5 parts of ester quaternary ammonium salt, 0.1-0.4 part of pore-forming agent and 0.2-0.7 part of coupling agent;
(2) mixing and stirring polyether silicone oil, amido ethoxy quaternary ammonium salt, ester quaternary ammonium salt and 4/5 of the total mass of the coupling agent, drying and grinding into powder to obtain a first mixture;
(3) and stirring and mixing the first mixture and the rest of the coupling agent to obtain a second mixture, and stirring and mixing the second mixture and the pore-opening agent to obtain the smooth material with the core-shell structure.
6. A smooth spunbond nonwoven fabric as claimed in claim 1, wherein: the fibers comprise milk fibers and viscose fibers mixed according to the mass ratio of (3-4) to (3-7).
7. A smooth spunbond nonwoven fabric as claimed in claim 1, wherein: the adhesive also comprises a cross-linking agent, wherein the cross-linking agent comprises any one of N, N-methylene-bisacrylamide and dicumyl peroxide.
8. The method for preparing a smooth spunbonded nonwoven fabric according to any one of claims 1 to 7, characterized in that it comprises the following preparation steps:
s1, mixing, melting and extruding: according to the formula, the raw materials are stirred and mixed, and then are melted and extruded through a screw extruder to obtain a melt in a flowing state;
s2, filtering: filtering the melt, and removing impurities to obtain a filter body;
s3, spinning: conveying the filter body to a spinning die head, and extruding through spinneret orifices of a spinneret plate to obtain nascent fiber trickle; the spinneret plate is provided with 8000-12000 spinneret holes;
s4, cooling and shaping: cooling and pre-stretching the nascent fiber trickle by process cold air at two sides, and performing secondary cooling and stretching shaping treatment by a stretching channel to obtain shaped fiber;
s5, preparing a fiber web: after the shaped fibers are subjected to filament separation through the diffusion channel, the shaped fibers are adsorbed on a conveying belt of a net forming curtain to form a continuous fiber net; the air permeability of the net-forming curtain is 9000-3/m2·d·atm；
S6, bonding: the fiber web is primarily bonded by a pre-pressing roller and finally bonded by a hot rolling mill of a mesh curtain conveying belt to form smooth spun-bonded non-woven fabric; the pressure of the hot rolling mill is 50-70N, and the temperature is 135-145 ℃.
9. The method of claim 8, wherein the step of preparing a smooth spunbond nonwoven comprises: the process temperature of the screw extruder is set as follows: the first temperature control zone was 180 ℃, the second temperature control zone was 210 ℃, the third temperature control zone was 230 ℃, the fourth temperature control zone was 235 ℃, the sixth temperature control zone was 235 ℃, and the seventh temperature control zone was 235 ℃.
10. The method of claim 8, wherein the step of preparing a smooth spunbond nonwoven comprises: in the step S3, the temperature of each region of the spinning die head is 235 ℃, and the monomer suction flow of the spinning die head is 2000-4000m3H; in step S4, the temperature of the process cold air is 15-20 ℃, the flow rate of the process cold air on the side blowing is 5000-7000m3The flow rate of the process cold air of the lower part of the side blowing is 10000-14000m3/h。
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