Two-component flexible spun-bonded non-woven material and preparation method thereof

Abstract

The invention provides a two-component flexible spunbond non-woven material and a preparation method thereof. The two-component flexible spunbond non-woven material is composed of a skin layer and a core layer. The skin layer is a PA6 composite material, the core layer is PBT, and anti-yellowing master batch and matting white are also added into the skin layer; melt spinning, cooling drafting, lapping and low-temperature hot rolling reinforcement are achieved through single-screw composite spinning equipment, the softness of the prepared spun-bonded non-woven fabric is reduced, the wear resistance is remarkably improved, and the spun-bonded non-woven fabric is free of yellowing under high temperature and long-term use and is suitable for the fields of medical treatment and public health, household cleaning, outdoor and industrial packaging and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spunbond nonwoven technology, and in particular to a bicomponent flexible spunbond nonwoven material and a preparation method thereof. BACKGROUND

[0002] As a kind of nonwoven material prepared by polymer melt spinning, drawing, laying and reinforcing processes, spunbond nonwoven fabric is widely used in medical and health care, personal care and other industries due to its high production efficiency and diversified performance. For example, in medical protective clothing, baby diapers and other products, spunbond nonwoven fabric plays an important role in protection, isolation and absorption. However, the existing spunbond nonwoven fabric technology still has significant defects.

[0003] In terms of flexibility, traditional spunbond nonwoven fabric usually uses rigid polymers such as polypropylene (PP) and polyester (PET) as the main raw material. The high molecular chain regularity and crystallinity of these polymers make the material less flexible. When the fiber diameter is large, the bending stiffness of the material increases exponentially with the fiber diameter, which may cause discomfort when the material comes into contact with the human skin, and it is difficult to meet the strict requirements of high-end medical dressings and close-fitting care products for soft touch. In addition, the single polymer system is prone to stress concentration during stretching and folding, resulting in insufficient flexibility of the material, which may be damaged in repeated use, thereby shortening the service life. In terms of preparation process, in order to improve the flexibility of spunbond nonwoven fabric, the existing technology often uses methods such as adding plasticizers, blending low-melting-point polymers or post-finishing coating. However, these processes not only increase the cost of raw materials, but also easily cause the clogging of the spinning assembly, thereby reducing the production stability. The additional coating process requires the purchase of special equipment, which further increases the production cost, resulting in a 15% to 30% increase in the overall cost of the product. In addition, the adjustment of process parameters such as complex multi-stage temperature control and high-precision drawing requires high precision of equipment and high technical level of operators, making it difficult to control the production process and limiting the promotion of large-scale industrial production. Traditional spunbond nonwoven fabric also has defects in terms of anti-yellowing performance. During storage and use, the material is easily affected by environmental factors such as light and temperature, which may cause yellowing due to oxidation, thereby affecting the appearance and quality of the product. Especially in the fields of high-end sanitary materials and outdoor protective products where color stability is required, the yellowing problem seriously limits the application of the product. Therefore, it is of great practical significance to develop a spunbond nonwoven fabric material that has excellent flexibility, wear resistance and anti-yellowing performance, and is low in preparation cost and simple in preparation process.

[0004] In view of the problems existing in the prior art, how to provide a flexible spunbond nonwoven fabric to solve the problems of insufficient flexibility, poor wear resistance and weak anti-yellowing performance of the existing spunbond nonwoven fabric, as well as high preparation cost and complex preparation process, is a problem to be solved by the present application. SUMMARY

[0005] Invention purposes:

[0006] The present application aims to provide a two-component flexible spunbond nonwoven material and a preparation method thereof, to solve the problems of insufficient flexibility, poor wear resistance and weak anti-yellowing performance of the existing spunbond nonwoven fabric, and high preparation cost and complex preparation process.

[0007] The technical scheme of the present application:

[0008] A two-component flexible spunbond nonwoven material, which is composed of a skin layer and a core layer; the skin layer is a PA6 composite material, and the core layer is PBT; the skin layer further contains anti-yellowing masterbatch and matt white.

[0009] Further, the mass ratio of the PA6 composite material to PBT is 2:8 to 8:2.

[0010] In the present application, PA6 is Wenzhou Huajian Nylon 6 chip, which is used as the core raw material of the skin layer. The molecular chain of PA6 is rich in amide groups (-CONH-), and the intermolecular hydrogen bonds form moderate force, which endows the skin layer with excellent flexibility and toughness. In the spinning process, the chip has stable fluidity after melting at 240-260℃, can uniformly wrap the core layer PBT, and reduces the overall softness of the material through the low bending stiffness of the skin layer, while the toughness of the molecular chain can disperse the friction stress and improve the basic wear resistance of the material.

[0011] In the present application, PBT of Taiwan Changchun Chemical 211S is used as the core layer material. The molecular chain contains a rigid aromatic ring structure, has high crystallinity and excellent thermal stability (melting temperature is about 225-235℃), and in the skin-core structure, the rigid skeleton of PBT provides strong support for the fiber, balances the flexibility of the PA6 skin layer, and avoids deformation of the material due to excessive flexibility; at the same time, the PBT of this model has good stability when melted and spun at 240-270℃, and has a close interface with the PA6 skin layer, which ensures that the skin-core structure bears force cooperatively and improves the overall mechanical strength and dimensional stability of the material.

[0012] Further, the mass ratio of the PA6 composite material to PBT is preferably 4:6 to 6:4.

[0013] Further, the preparation of the PA6 composite material comprises the following steps:

[0014] S1: dry PA6 and calcium chloride at 90-100℃ for 6-8h, and mix PA6 and calcium chloride in a high-speed mixer for 5-10min according to the proportion,

[0015] S2: then add N-butylbenzenesulfonamide according to the mass ratio, and blend and extrude with an extruder to granulate, the temperature of the extruder is 220-240℃, and the die temperature is 220℃;

[0016] S3: After the extruded granules are dried at 80℃ for 4h, the standard sample bars are prepared by injection molding machine, the injection molding temperature is 220-240℃, the injection molding pressure is 45-50MPa, the pressure maintaining time is 30-45min, then the temperature is kept at 25℃ for 24-36h in the thermostat, and the PA6 composite material is prepared.

[0017] Further, the adding amount of the N-butyl benzene sulfonamide is 10-20% of the mass of the mixture of PA6 and calcium chloride.

[0018] Further, the adding amount of the anti-yellowing master batch is 1-2% of the mass of the skin layer.

[0019] In the application, the anti-yellowing master batch plays a role by compounding antioxidants and ultraviolet absorbers, the antioxidants can capture free radicals generated in the oxidation process of PA6, and terminate the chain growth reaction; the ultraviolet absorbers selectively absorb ultraviolet light of 290-400nm, reducing the damage of photooxidation to the skin layer; the anti-yellowing master batch master batch takes PA6 as a carrier, and the adding amount is 1-2%, which has excellent compatibility with the PA6 skin layer, can be uniformly dispersed and directional protection of the skin layer exposed to the environment, significantly improves the anti-yellowing performance of the material under high temperature and light, and ensures long-term stability of color and luster.

[0020] Further, the adding amount of the mat white is 1-5% of the mass of the skin layer.

[0021] In the application, the main component of the mat white is titanium dioxide particles, the particle size of which is adapted to the wavelength of visible light, which can destroy the mirror surface reflection of the PA6 skin layer through the light scattering mechanism, effectively reduce the gloss of the material surface, and make the appearance more soft and natural; the particles such as titanium dioxide have high hiding power, which can cover the slight yellow background color of PA6 or PBT itself, and make the color and luster of the material more uniform; the adding amount of the mat white is 1-5% of the mass of the skin layer, and the surface treatment has good compatibility with the PA6 melt, which does not significantly affect the flexibility, wear resistance and other core properties of PA6, and realizes the effect of "appearance optimization without sacrificing function".

[0022] The application provides a preparation method of a two-component flexible spunbond nonwoven material.

[0023] S1: melt spinning: using single screw composite spinning equipment, PA6 is added to A screw, and is melted at 240-270℃; PBT is added to B screw, and is melted at 230-270℃, then the flow rates of the two melts are controlled by independent metering pumps, and the melts enter a skin-core composite spinning assembly, and are extruded through a spinneret to form a skin-core structure fiber, the spinneret aperture is 0.3-0.5μm, the number of holes is 12000-12200, the length of A screw is 120-130mm, the rotation speed is 70-80rpm, the length-diameter ratio is 25-30:1, the length of B screw is 115-125mm, the rotation speed is 60-70rpm, and the length-diameter ratio is 25-30:1;

[0024] S2: cooling and drawing: the extruded fiber is cooled through side blowing, the side blowing temperature is 13-20℃, and the gas flow rate is 55-60CMM; the cooled fiber is drawn through positive pressure, the drawing height is 70-75cm, the drawing slit is 5-8mm, and the drawing air pressure is 0.1-0.3MPa;

[0025] S3: hot rolling and reinforcing: the fiber is drawn and laid after hot rolling and reinforcing, the hot rolling temperature is 190-220℃, the pressure is 3-6MPa, the rolling machine action time is 0.05-0.1s, and the double-component skin-core structure flexible spun-bond nonwoven material is prepared.

[0026] Further, the melting temperature of A screw is 245-255℃, and the melting temperature of B screw is 250-265℃.

[0027] Further, the spinneret aperture is 0.4-0.5μm, the number of holes is 12000-12119, the length of A screw is 130-135mm, the rotation speed is 70-75rpm, and the length-diameter ratio is 28-30:1; the length of B screw is 120-125mm, the rotation speed is 60-70rpm, and the length-diameter ratio is 27-30:1.

[0028] Further, the side blowing temperature is 14-19℃, and the gas flow rate is 55-58CMM.

[0029] Further, the hot rolling temperature is 190-220℃, the pressure is 5-6MPa, and the action time is 0.06-0.08s.

[0030] The application provides a flexible spun-bond non-woven fabric based on PA6 / PBT double-component skin-core structure. Through innovative material combination and skin-core structure, the excellent flexibility of PA6 and the stable structure support of PBT are utilized to reduce the bending stiffness of the non-woven fabric, improve the softness, break through the flexibility limitation of the material, and improve the product touch comfort and durability. Through optimization of the material ratio and preparation process of PA6 / PBT and anti-yellowing master batch, the skin layer interface exposed to the environment is directly protected, the anti-yellowing performance of the material under high temperature and light is significantly improved, and the color stability is ensured for a long time. The matt white has good surface treatment and PA6 melt compatibility, does not affect the flexibility, wear resistance and other core properties of PA6, and realizes the effect of "appearance optimization without sacrificing function". The application selects the base material and additives with matched properties, utilizes the molecular structure characteristics and action mechanism of each component to realize the comprehensive optimization of the flexibility, wear resistance, anti-yellowing performance and appearance quality of the material. Through optimization of the spinning assembly and process parameters, the low-temperature hot rolling reinforcement is adopted to replace the traditional high-temperature and high-pressure hot rolling process, the single-screw composite spinning equipment and low-temperature hot rolling reinforcement process are adopted, the operation process is simplified, the process difficulty is reduced, the production stability and efficiency are improved, the raw material waste, equipment maintenance cost and energy consumption are reduced, the process parameter regulation is simplified, the comprehensive production cost is reduced, and industrialized mass production is realized.

[0031] Advantages:

[0032] 1. Excellent flexibility and touch: the non-woven material adds plasticizer and reinforcing agent in PA6, and the PA6 composite material is used as the skin layer material. The low glass transition temperature and unique molecular structure of PA6 endow the non-woven fabric with excellent softness.

[0033] 2. Significantly improved wear resistance: the amide groups in the PA6 molecular chain provide good toughness and surface friction resistance, and the rigid support of the PBT core layer makes the wear resistance of the non-woven fabric greatly improved. The product is heated at room temperature and 80 DEG C for 2 hours, and then subjected to the Martindale wear test. After 1000 times of wear resistance, the fabric surface is basically free of fuzzing, pilling and floating silk phenomenon.

[0034] 3. Excellent anti-yellowing performance: the PA6 / PBT ratio is accurately controlled, the anti-yellowing master batch is added, and the single-screw composite spinning process parameters are optimized to effectively inhibit the oxidative degradation of the material under high temperature, light and other conditions. According to the internal test standard of Jingfa, the non-woven fabric does not yellow under high temperature test, and the color is stable during long-term storage and use, which meets the strict requirements of high-end sanitary materials, outdoor protective products and other appearance quality. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 : Figure of example 1 front wear test result

[0036] Figure 2 Figure 1 shows the results of the abrasion resistance test on the front surface of Example 1;

[0037] Figure 3 Figure 2 shows the results of the abrasion resistance test on the front surface of Example 2;

[0038] Figure 4 Figure 2 shows the results of the abrasion resistance test on the front surface of Example 2;

[0039] Figure 5 Figure 3 shows the results of the abrasion resistance test on the front surface of Example 3;

[0040] Figure 6 Figure 4 shows the results of the abrasion resistance test on the front surface of Example 4. DETAILED DESCRIPTION

[0041] The present application will be described in detail below with reference to specific embodiments. It should be noted that the following experimental examples are illustrative of the present application and are not intended to limit the present application. Other combinations and various modifications within the scope of the present application can be made without departing from the spirit or scope of the present application.

[0042] The chemical reagents used in the present application are commercially available and are of analytical purity unless otherwise specified. PA6 is a chip from Wenzhou Huajian Nylon 6, and PBT is 211S from Taiwan Changchun Chemical Industry.

[0043] The mat white used in the following experimental examples is Nantong Yiheng CR90FS, and the anti-yellowing master batch is Ruide Chemical RY203.

[0044] Preparation of PA6 composite material:

[0045] S1: PA6 and calcium chloride (PA6 to calcium chloride mass ratio 94:6) were dried at 100°C for 6h, and then PA6 and calcium chloride were added to a high-speed mixer in proportion and mixed for 5min,

[0046] S2: N-butylbenzenesulfonamide (20%) was then added in proportion, and extrusion granulation was performed by extruder blending at an extruder temperature of 240°C and a die temperature of 220°C;

[0047] S3: The extruded granules were dried at 80°C for 4h, and then standard samples were injection molded by an injection molding machine at an injection molding temperature of 240°C, an injection molding pressure of 45MPa, and a pressure holding time of 30min, followed by constant temperature treatment in a 25°C constant temperature oven for 24h, to obtain the PA6 composite material.

[0048] Preparation of anti-yellowing master batch:

[0049] The anti-yellowing master batch Ruide Chemical RY203, titanium dioxide master batch, antioxidant 1010, and ultraviolet absorber uv-329 were mixed in proportion at a mass ratio of 10:5:1:1.

[0050] Example 1

[0051] 1. Material components: the mass ratio of PA6 composite material to PBT is 4:6, containing 1.5% of anti-yellowing master batch of PA6 composite material and 3% of matting white of PA6 composite material;

[0052] 2. Preparation process:

[0053] S1: melt spinning: using a single screw composite spinning equipment, PA6 composite material, anti-yellowing master batch and matting white are added to A screw rod and melted at 255°C; PBT is added to B screw rod and melted at 250°C, then the flow rates of the two melts are controlled by independent metering pumps, and then the two melts enter the skin-core composite spinning assembly to form skin-core structure fibers through the spinneret, the spinneret aperture is 0.4μm, the number of holes is 12119, the length of A screw rod is 130mm, the rotation speed is 75rpm, the length-diameter ratio is 30:1, the length of B screw rod is 120mm, the rotation speed is 60rpm, and the length-diameter ratio is 27:1;

[0054] S2: cooling and drawing: the extruded fibers are cooled by side blowing, the side blowing temperature is 14.7°C, and the gas flow rate is 58CMM; the cooled fibers are drawn by positive pressure, the drawing height is 70cm, the drawing slit is 6mm, and the drawing air pressure is 0.2MPa;

[0055] S3: hot rolling and consolidation: after the fibers are drawn and laid, hot rolling and consolidation are carried out, the hot rolling temperature is 210°C, the pressure is 5MPa, the rolling machine action time is 0.08s, and a double-component skin-core structure flexible spunbond nonwoven material with a grammage of 40g / m 2 is prepared;

[0056] The nonwoven fabric is heated at room temperature and 80°C for 2h respectively, and then Martin Dale abrasion resistance test is carried out, the weight pressure is 9kpa, after 1000 times of abrasion resistance, there is a little fuzz and pilling and floating silk phenomenon on the surface of the fabric, and the abrasion resistance is excellent.

[0057] Example 2

[0058] 1. Material components: the mass ratio of PA6 composite material to PBT is 5:5, containing 1% of anti-yellowing master batch of PA6 composite material and 2% of matting white of PA6 composite material;

[0059] 2. Preparation process:

[0060] S1: melt spinning: using single screw composite spinning equipment, PA6 composite material, anti-yellowing master batch and matting white are added to A screw rod, and are melted at 255°C; PBT is added to B screw rod, and is melted at 250°C, then the flow rates of the two melts are controlled by independent metering pumps, and the melts enter a skin-core composite spinning assembly, and are extruded through a spinneret to form skin-core structure fibers, the spinneret aperture is 0.4 μm, the number of holes is 12119, the length of A screw rod is 130 mm, the rotation speed is 75 rpm, the length-diameter ratio is 30:1, the length of B screw rod is 120 mm, the rotation speed is 60 rpm, and the length-diameter ratio is 27:1;

[0061] S2: cooling and drawing: the extruded fibers are cooled by side blowing, the side blowing temperature is 15.8°C, and the gas flow rate is 58 CMM; the cooled fibers are drawn by positive pressure, the drawing height is 70 cm, the drawing slit is 6 mm, and the drawing air pressure is 0.2 MPa;

[0062] S3: hot rolling and reinforcing: after the fibers are drawn and laid, hot rolling and reinforcing are performed, the hot rolling temperature is 190°C, the pressure is 5 MPa, and the rolling action time is 0.08 s, and a double-component skin-core structure flexible spun-bond nonwoven material with a grammage of 40 g / m 2 is prepared;

[0063] The nonwoven fabric is heated at room temperature and 80°C for 2 h respectively, and then a Martindale abrasion test is performed, the weight pressure is 9 kPa, and after 1000 abrasions, the fabric surface has slight fuzzing, pilling and floating silk phenomenon, and the abrasion resistance is excellent.

[0064] Example 3

[0065] 1. Material composition: the mass ratio of PA6 composite material to PBT is 6:4, the anti-yellowing master batch accounts for 2% of the mass of the PA6 composite material, and the matting white accounts for 4% of the mass of the PA6 composite material;

[0066] 2. Preparation process:

[0067] S1: melt spinning: using single screw composite spinning equipment, PA6 composite material, anti-yellowing master batch and matting white are added to A screw rod, and are melted at 257.5°C; PBT is added to B screw rod, and is melted at 260°C, then the flow rates of the two melts are controlled by independent metering pumps, and the melts enter a skin-core composite spinning assembly, and are extruded through a spinneret to form skin-core structure fibers, the spinneret aperture is 0.4 μm, the number of holes is 12119, the length of A screw rod is 130 mm, the rotation speed is 75 rpm, the length-diameter ratio is 30:1, the length of B screw rod is 120 mm, the rotation speed is 60 rpm, and the length-diameter ratio is 27:1;

[0068] S2: cooling and drawing: the extruded fibers are cooled by side blowing, the side blowing temperature is 18.4℃, the gas flow is 58CMM; the cooled fibers are drawn by positive pressure, the drawing height is 70cm, the drawing slit is 6mm, the drawing air pressure is 0.2MPa;

[0069] S3: hot rolling and reinforcing: the fibers are drawn and laid after hot rolling and reinforcing, the hot rolling temperature is 220℃, the pressure is 5MPa, the rolling action time is 0.08s, and the obtained spunbond nonwoven material has a weight of 40g / m 2 ;

[0070] The nonwoven fabric is heated at room temperature and 80℃ respectively for 2h, and then subjected to the Martindale abrasion test, the weight pressure is 9kpa, and after 1000 times of abrasion, the fabric surface is basically free of fuzzing, pilling and floating silk phenomenon, and the abrasion resistance is excellent.

[0071] Comparative Example 1

[0072] 1. Material composition: 100% polypropylene (PP), without anti-yellowing masterbatch and matt white;

[0073] 2. Preparation process:

[0074] S1: melt spinning: using a single screw composite spinning device, PP is added to the screw, melted at 220℃, and then extruded through a spinneret, the spinneret aperture is 0.4μm, the number of holes is 12119, the length of A screw is 130mm, the rotation speed is 75rpm, the length-diameter ratio is 30:1, the length of B screw is 120mm, the rotation speed is 60rpm, and the length-diameter ratio is 27:1;

[0075] S2: cooling and drawing: the extruded fibers are cooled by side blowing, the side blowing temperature is 22.6℃, the gas flow is 50CMM; the cooled fibers are drawn by positive pressure, the drawing height is 70cm, the drawing slit is 6mm, the drawing air pressure is 0.2MPa;

[0076] S3: hot rolling and reinforcing: the fibers are drawn and laid after hot rolling and reinforcing, the hot rolling temperature is 220℃, the pressure is 5MPa, the rolling action time is 0.08s, and the obtained spunbond nonwoven material has a weight of 40g / m 2 ;

[0077] The nonwoven fabric is heated at room temperature and 80℃ respectively for 2h, and then subjected to the Martindale abrasion test, the weight pressure is 9kpa, and after 1000 times of abrasion, the fabric surface is basically free of fuzzing, pilling and floating silk phenomenon, and the abrasion resistance is excellent.

[0078] Comparative Example 2

[0079] 1. Material components: the mass ratio of PA6 composite material to PBT is 5:5, containing 1.5% of anti-yellowing master batch of PA6 composite material and 3% of matt white of PA6 composite material;

[0080] 2. Preparation process:

[0081] S1: melt spinning: using a single screw spinning device, the PA6 composite material, anti-yellowing master batch and matt white are blended with PBT and then melted at 280℃, and then extruded through a spinneret with a hole diameter of 0.4μm and a hole number of 12119, the length of A screw is 130mm, the rotation speed is 75rpm, the length-diameter ratio is 30:1, the length of B screw is 120mm, the rotation speed is 60rpm, and the length-diameter ratio is 27:1;

[0082] S2: cooling and drawing: the extruded fiber is cooled by side blowing, the side blowing temperature is 15.8℃, and the gas flow is 58CMM; the cooled fiber is drawn by positive pressure, the drawing height is 70cm, the drawing slit is 6mm, and the drawing air pressure is 0.2MPa;

[0083] S3: hot rolling and reinforcement: after the fiber is drawn and laid, hot rolling and reinforcement are carried out, the hot rolling temperature is 220℃, the pressure is 5MPa, and the rolling action time is 0.08s, and a bicomponent skin-core structure flexible spunbond nonwoven material with a grammage of 40g / m 2 is prepared;

[0084] The nonwoven fabric is heated at room temperature and 80℃ respectively for 2h, and then subjected to a Martindale abrasion test, the weight pressure is 9kpa, after 1000 times of abrasion, the fabric has intensified pilling and fuzz breaking, and has poor abrasion resistance.

[0085] Comparative example 3

[0086] 1. Material components: the mass ratio of PA6 composite material to PBT is 9:1, containing 1.5% of anti-yellowing master batch of PA6 composite material and 3% of matt white of PA6 composite material;

[0087] 2. Preparation process:

[0088] S1: melt spinning: using a single screw composite spinning device, the PA6 composite material, anti-yellowing master batch and matt white are added to A screw and melted at 257.5℃; PBT is added to B screw and melted at 260℃, then the flow rates of the two melts are controlled by independent metering pumps, and then the two melts are introduced into a skin-core composite spinning assembly to form a skin-core structure fiber through a spinneret with a hole diameter of 0.4μm and a hole number of 12119, the length of A screw is 130mm, the rotation speed is 75rpm, the length-diameter ratio is 30:1, the length of B screw is 120mm, the rotation speed is 60rpm, and the length-diameter ratio is 27:1;

[0089] S2: cooling and drawing: the extruded fibers are cooled by side air blowing, the temperature of the side air blowing is 18.4℃, the gas flow is 58CMM; the cooled fibers are drawn by positive pressure, the drawing height is 70cm, the drawing slit is 6mm, the drawing air pressure is 0.2MPa;

[0090] S3: hot rolling and reinforcing: the drawn fibers are hot rolled and reinforced, the hot rolling temperature is 220℃, the pressure is 5MPa, the rolling time is 0.08s, and a bicomponent core-sheath structure flexible spunbond nonwoven material with a grammage of 40g / m 2 is prepared;

[0091] The nonwoven fabric is heated at room temperature and 80℃ respectively for 2h, and then subjected to a Martindale abrasion test, the weight pressure is 9kpa, after 1000 times of abrasion, the fabric has slight fuzzing and pilling phenomenon, and the abrasion resistance is excellent.

[0092] Performance test:

[0093] 1. According to the test standard of ASTM D5035, the mechanical properties such as transverse breaking strength, elongation at break, longitudinal breaking strength, elongation at break are tested.

[0094] 2. According to the test standard of GB / T 5453, the air permeability test is carried out, using fabric air permeability instrument, setting the pressure difference of the instrument to 100Pa.

[0095] 3. According to the test standard of EDANA WSP 90.3, the softness test is carried out, using the probe to vertically downwardly press the sample, setting the downward speed of the probe to 10mm / s, the downward distance to 8mm, recording the resistance received by the probe when penetrating the sample by 8mm, unit: g.

[0096] 4. According to the test standard of GB / T 30669-2014, the anti-yellowing test is carried out; the test conditions are set as follows: irradiance is 0.71W / m 2 (340nm), the temperature in the box is 40±3℃, the relative humidity is 50±5%, the irradiation time is 168h, after the test, the sample is taken out from the test box, and placed in an environment with a temperature of 23±2℃ and a relative humidity of 50±5% for at least 4h, the irradiated sample is compared with the non-irradiated control sample, and the yellowing grade of the sample is evaluated using a gray sample card, the grade is divided into 1-5 levels, 5 level represents no yellowing, and 1 level represents the most serious yellowing.

[0097] Table 1: performance test result table

[0098]

[0099]

[0100] It can be known from the test result table that the two-component flexible spunbond nonwoven material has good softness, wear resistance, no yellowing under high temperature and long-term use, which is embodied in that, as compared with Comparative Example 1, when polypropylene is selected as the material, the prepared spunbond nonwoven material has poor flexibility, poor anti-yellowing performance and poor wear resistance, and cannot meet the expected requirements; as compared with Comparative Example 2, the spunbond nonwoven material prepared by blending in Comparative Example 2 cannot realize the precise synergy of the flexibility of PA6 composite material and the rigidity of PBT as the skin-core structure, the uneven distribution of molecular chains leads to stress concentration and mechanical property reduction, and cannot meet the expected requirements; as compared with Comparative Example 3, as the proportion of PA6 composite material is increased, although more excellent softness and air permeability are brought, the longitudinal breaking strength is significantly reduced and the high-temperature wear resistance is weakened due to the insufficient proportion of PBT core layer, and thus cannot meet the expected requirements. Therefore, Comparative Example 1 verifies the performance advantages of the two-component skin-core structure compared with the traditional single polymer material; Comparative Example 2 proves the irreplaceability of the skin-core structure in performance synergy; and Comparative Example 3 verifies the rationality of the mass ratio of PA6 composite material / PBT.

[0101] The present application can also be made by other various experimental examples without departing from the spirit and essence of the present application, and those skilled in the art can make various corresponding changes and modifications according to the present application, but these corresponding changes and modifications should all belong to the protection scope of the claims attached to the present application.

Claims

1. A bicomponent flexible spunbond nonwoven material characterized in that, The two-component flexible spunbond nonwoven material is composed of a skin layer and a core layer; the skin layer is a PA6 composite material, and the core layer is PBT; the skin layer is additionally added with an anti-yellowing master batch and a matt white.

2. The bicomponent flexible spunbond nonwoven material of claim 1, wherein, The mass ratio of the PA6 composite material to PBT is 2:8-8:2; preferably, the mass ratio of the PA6 composite material to PBT is 4:6-6:

4.

3. The bicomponent flexible spunbond nonwoven material of claim 1, wherein, The preparation of the PA6 composite material comprises the following steps: S1: drying PA6 and calcium chloride at 90-100℃ for 6-8h, and adding PA6 and calcium chloride into a high-speed mixer in proportion and mixing for 5-10min, S2: then adding N-butylbenzenesulfonamide in a mass ratio, and blending and extruding in an extruder to granulate, the extruder temperature being 220-240℃, and the die temperature being 220℃; S3: after the extruded granules are dried at 80℃ for 4h, the granules are injected into a standard sample bar by an injection molding machine, the injection molding temperature being 220-240℃, the injection molding pressure being 45-50MPa, the pressure maintaining time being 30-45min, and then the sample bar is kept in a thermostat at 25℃ for 24-36h, to obtain the PA6 composite material; The addition amount of the N-butylbenzenesulfonamide is 10-20% of the mass of the mixture of PA6 and calcium chloride.

4. The bicomponent flexible spunbond nonwoven material of claim 1, wherein, The addition amount of the anti-yellowing master batch is 1-2% of the mass of the skin layer; the anti-yellowing master batch is a mixture of anti-yellowing master batch RY203, titanium white master batch, antioxidant 1010 and ultraviolet absorber uv-329.

5. The bicomponent flexible spunbond nonwoven material of claim 1, wherein, The addition amount of the matt white is 1-5% of the mass of the skin layer.

6. The method of making a bicomponent flexible spunbond nonwoven material according to any of claims 1-5, wherein, The method comprises the following steps: S1: melt spinning: using a single-screw composite spinning device, the PA6 composite material is added into A screw rod and melted at 240-270℃, and the PBT is added into B screw rod and melted at 230-270℃, then the two melt flows are controlled by independent metering pumps, and then the two melt flows enter a skin-core composite spinning assembly to form a skin-core structure fiber through a spinneret, the spinneret aperture is 0.3-0.5μm, the number of holes is 12000-13000, the length of A screw rod is 120-135mm, the rotation speed is 70-80rpm, the length-diameter ratio is 25-30:1, the length of B screw rod is 115-125mm, the rotation speed is 60-70rpm, and the length-diameter ratio is 25-30:1; S2: cooling and drawing: the extruded fiber is cooled by side blowing, the side blowing temperature is 13-20℃, and the gas flow is 55-60CMM; the cooled fiber is drawn by positive pressure, the drawing height is 70-75cm, the drawing slit is 5-8mm, and the drawing air pressure is 0.1-0.3MPa; S3: hot rolling and reinforcing: after the fiber is drawn and laid, hot rolling and reinforcing are performed, the hot rolling temperature is 190-220℃, the pressure is 3-6MPa, and the rolling machine acting time is 0.05-0.1s, to obtain the two-component skin-core structure flexible spunbond nonwoven material.

7. The method of making a bicomponent flexible spunbond nonwoven material according to claim 6, wherein, The melting temperature of the A screw rod is 245-255℃, and the melting temperature of the B screw rod is 250-265℃.

8. The method of making a bicomponent flexible spunbond nonwoven material according to claim 6, wherein, The spinneret aperture is 0.4-0.5 microns, the number of holes is 12000-12119; the length of A screw is 130-135 mm, the rotation speed is 70-75 rpm, the length-diameter ratio is 28-30:1; the length of B screw is 120-125 mm, the rotation speed is 60-70 rpm, the length-diameter ratio is 27-30:

1.

9. The method of making a bicomponent flexible spunbond nonwoven material according to claim 6, wherein, The side blowing temperature is 14-19 DEG C, the gas flow is 55-58 CMM.

10. The method of making a bicomponent flexible spunbond nonwoven material of claim 6, wherein, The hot rolling temperature is 190-220 DEG C, the pressure is 5-6 MPa, the action time is 0.06-0.08 s.

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