A method for preparing an elastic sanitary material

Abstract

This invention relates to the field of filter materials technology and discloses a method for preparing an elastic sanitary material. The method employs a composite process of needle punching, cold pressing, and stretching to bond a spunbond layer and a meltblown layer. The spunbond layer has a core-skin structure consisting of a PE resin outer layer and a PP resin core layer, while the meltblown layer is a TPU meltblown layer. Needling allows the fibers of the spunbond layer to penetrate the meltblown layer, improving the connectivity between the fibers. Cold pressing at the needle punches melts the PP resin on the surface of the spunbond fibers, allowing the melted PP resin to act as an adhesive, further enhancing the bonding strength. Simultaneously, cold pressing reduces the size of the needle punches, and stretching closes the needle punches and flattens the pressure points, significantly improving the uniformity of the spunbond layer surface. This elastic material is soft, conforms well to the skin, is highly breathable, significantly improves comfort, and has no hard, clumpy feel.

Description

Technical Field

[0001] This invention relates to the field of filter materials technology, and in particular to a method for preparing an elastic sanitary material. Background Technology

[0002] Sanitary napkins are an important hygiene product. Their structure consists of a super absorbent layer, a edging layer at the bottom of the super absorbent layer, and a top layer on top of the super absorbent layer. One side of the edging layer is attached to the clothing, and the other side is attached to the super absorbent layer to prevent the absorbed liquid from contacting and staining the clothing. Usually, the edging layer is designed to be larger than the super absorbent layer, so that when the edging layer and the super absorbent layer are combined, they can form an outer edge structure at the edge of the super absorbent layer. This outer edge structure can effectively prevent side leakage.

[0003] The edging layer needs to both block the absorbent layer and clothing, and its outer edge structure comes into contact with the skin. Therefore, the edging layer needs to meet the performance requirements of being waterproof, breathable, skin-friendly, and soft. Currently, the materials used for edging layers in existing technologies are usually made of a composite of various non-woven fabrics with different functions. For example, CN115648778A discloses a sanitary care base film and its preparation method. This technical solution consists of a non-woven fabric layer, a breathable layer, and a waterproof layer. The non-woven fabric layer is SMS non-woven fabric, the breathable membrane is TPU or PE membrane, and the waterproof membrane is PTFE membrane. The three-layer structure is composited using an ultrasonic welding machine. In actual use, it was found that when the composite layer is welded using an ultrasonic welding machine, the weld joint will solidify at high temperature. The solid formation inside this weld point will significantly reduce the breathability of the base film. Therefore, in order to reduce the impact of the welding process on the spot welding, it is necessary to conduct in-depth research on the composite process of the edging layer. Summary of the Invention

[0004] This invention addresses the problem of significantly reduced uniformity and breathability in materials composited with nonwoven fabric and meltblown fabric using welding technology. It provides a method for preparing an elastic sanitary material. This method employs a composite process of needle punching, cold pressing, and stretching to bond a spunbond layer and a meltblown layer. The spunbond layer has a core-skin structure consisting of a PE resin outer layer and a PP resin core layer, while the meltblown layer is a TPU meltblown layer. Needling allows the fibers of the spunbond layer to penetrate the meltblown layer, improving the connectivity between the fibers. Cold pressing at the needle punches melts the PP resin on the surface of the spunbond fibers, allowing the melted PP resin to act as an adhesive, further enhancing the bonding strength. Simultaneously, cold pressing reduces the size of the needle punches, and stretching closes the needle punches and flattens the pressure points, significantly improving the uniformity of the spunbond layer surface. This elastic material is soft, highly skin-friendly, highly breathable, significantly improves comfort, and has no hard, clumpy feel.

[0005] The specific technical solution of this invention is as follows: A method for preparing an elastic sanitary material includes the following steps: An elastic sanitary material is made by laminating a spunbond layer onto the surface of a meltblown layer. The fibers of the spunbond layer have a core-sheath structure, with PE resin as the sheath layer and PP resin as the core layer, and the fibers of the meltblown layer are TPU resin. The composite method includes needle punching, cold pressing, and stretching; The conditions for needle punching include: a needle punching density of 1~5 needles / cm², and a needle punching direction from the spunbond layer to the meltblown layer; The conditions for cold pressing include: the area of ​​the cold pressing point is 3~20%, and the cold pressing temperature is 125~135℃; The stretching conditions include: warp and weft stretching, with a tensile strength of 30~50 N / 50m.

[0006] This invention provides a method for preparing an elastic sanitary material. The method uses spunbond fabric and meltblown fabric to prepare the elastic material. The meltblown fabric fibers are made of TPU resin, which gives the elastic material excellent wrinkle resistance, water resistance, and breathability. The spunbond fabric fibers have a core-sheath structure with a PE resin outer layer and a PP resin core layer. This spunbond fabric has an ultra-soft touch and excellent waterproof and breathable properties, providing excellent comfort against the skin and significantly improving the user experience. Traditional composite processes often use infrared welding to fuse the spunbond and meltblown layers together. However, this invention discovers that after welding, the composite points melt and solidify into a single unit. Simultaneously, the pore structure inside the fibers is destroyed during welding, resulting in a significant reduction in the material's breathability.

[0007] Therefore, to solve the above problems, this invention provides a composite method of needle punching, cold pressing, and stretching. First, needle punching is performed to insert the spunbond layer into the meltblown layer from the direction of the spunbond layer. The spunbond fibers are penetrated and entangled in the meltblown layer. Then, a pressure head is used to press the needle punch points. The cold pressing head is set to a specific temperature. At this specific temperature, the PE resin in the outer layer of the spunbond fibers melts, while the PP resin in the core layer remains solidified. The melted PE resin bonds at the entanglement points, forming anchor points for the spunbond fibers within the meltblown layer, significantly enhancing the composite strength of the spunbond and meltblown layers. During cold pressing, the needle punches can be compressed and reduced in size. Finally, stretching is performed to reduce the pressure generated during cold pressing. The needle-punching process is used to flatten the spunbond layer and close the needle holes, improving the uniformity of the spunbond layer surface. The resulting elastic sanitary material has high surface uniformity and flatness, resulting in excellent skin adhesion during use. It also avoids hard nodes caused by welding, significantly improving comfort. The internal meltblown fiber structure of the resulting elastic sanitary material remains intact, ensuring that the breathability of the meltblown material is not significantly altered. Furthermore, the composite strength of the meltblown and spunbond layers obtained through this method is significantly higher than that obtained using only needle-punching. It remains undelaminated even under continuous high-intensity rubbing, providing users with an excellent experience during high-intensity activities.

[0008] Preferably, the spunbond layer is made by spunbonding PP resin and PE resin.

[0009] Preferably, the conditions of the spunbond process include: melting and mixing PP resin to form molten PP, melting and mixing PE resin to form molten PE, injecting molten PP and molten PE into a screw extruder to extrude and form a composite PP / PE melt, injecting the composite PP / PE melt into a spinning device for spinning and stretching to form filaments, and placing the filaments in a web forming device to form a spunbond layer.

[0010] Preferably, the fibers of the spunbond layer have a core-sheath structure, with PP resin as the core layer and PE resin as the sheath layer, and the mass ratio of the core layer to the sheath layer is 3~7:1.

[0011] Preferably, the basis weight of the spunbond layer is 5~20 g / m². 2 .

[0012] Preferably, the meltblown layer is made by sequentially extruding TPU resin raw material through a screw extrusion reaction and a meltblown process.

[0013] Preferably, the TPU resin raw material includes: isocyanate, polyol, chain extender and catalyst, wherein the isocyanate is one or more of aliphatic diisocyanate and aromatic diisocyanate, the polyol is one or more of polyester polyol and polyether polyol, the chain extender is one or more of ethylene glycol, butanediol, ethylene glycol and hydroquinone dihydroxyethyl ether, and the catalyst is one or more of tertiary amine catalyst and organometallic catalyst.

[0014] Preferably, the conditions for the screw extrusion reaction include a reaction temperature of 150~220 ℃.

[0015] Preferably, the conditions for the meltblown process include: meltblown die temperature 210~270 ℃, hot air temperature 210~270 ℃, and air pressure 0.1~0.5 MPa.

[0016] Preferably, the basis weight of the meltblown layer is 3~15 g / cm³. 2 .

[0017] Compared with the prior art, this application has the following technical effects: This invention provides a method for preparing an elastic sanitary material. The method employs a composite process of needle punching, cold pressing, and stretching to bond a spunbond layer and a meltblown layer. The spunbond layer has a core-skin structure consisting of a PE resin outer layer and a PP resin core layer. The meltblown layer is a TPU meltblown layer. Needling allows the fibers of the spunbond layer to penetrate the meltblown layer, improving the connectivity between the fibers. Cold pressing at the needle punches melts the PP resin on the surface of the spunbond fibers, allowing the melted PP resin to act as an adhesive, further enhancing the bonding strength. Simultaneously, cold pressing reduces the size of the needle punches. Stretching then closes the needle punches and flattens the pressure points, significantly improving the uniformity of the spunbond layer surface. This elastic material is soft, conforms well to the skin, is highly breathable, significantly improves comfort, and has no hard, clumpy feel. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments.

[0019] Example 1: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 10 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165 ℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135 ℃ to produce molten PE. The molten PP and molten PE are separately injected into a spinning box, and then melt-spun through a spinneret to produce a PE resin sheath and a PP resin core layer, with a core-to-sheath mass ratio of 5:1. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 12 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 2 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 5%, and the temperature of the cold press roller is 130℃. Then, the preform is heat-dried at a temperature of 85℃ and then stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 40 N / 50m.

[0020] Example 2: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 3 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165 ℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135 ℃ to produce molten PE. The molten PP and molten PE are separately injected into a spinning box, and then melt-spun through a spinneret to produce a PE resin sheath and a PP resin core layer, with a core-to-sheath mass ratio of 3:1. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 5 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 1 needle / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 3%, the temperature of the cold press roller is 125℃, and then the preform is heated at 80℃ and stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 30 N / 50m.

[0021] Example 3: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 15 g / cm³. 2 ; Preparation of spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at a temperature of 165 ℃ to make molten PP, and PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at a temperature of 135 ℃ to make molten PE. Molten PP and molten PE are injected into a spinning box, and then melt-spun through a spinneret with a PE resin sheath and a PP resin core layer. The mass ratio of the core layer to the sheath is 7:1. The melt-spun fibers are cooled by blowing and stretching in the air to form filaments. The filaments are then distributed on a web forming machine by the action of a filament arranging device to form a fiber web to make a spunbond layer. The basis weight of the spunbond layer is 20 g / m2. Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 5 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 20%, the temperature of the cold press roller is 135℃, and then the preform is heated at 90℃ and stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 50 N / 50m.

[0022] Example 4: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 10 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165 ℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135 ℃ to produce molten PE. The molten PP and molten PE are separately injected into a spinning box, and then melt-spun through a spinneret to produce a PE resin sheath and a PP resin core layer, with a core-to-sheath mass ratio of 4:1. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 15 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 3 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 8%, the temperature of the cold press roller is 130℃, and then the preform is heated at 85℃ and stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 40 N / 50m.

[0023] Example 5: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 12 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165 ℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135 ℃ to produce molten PE. The molten PP and molten PE are separately injected into a spinning box, and then melt-spun through a spinneret to produce a PE resin sheath and a PP resin core layer, with a core-to-sheath mass ratio of 6:1. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 13 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 3 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 10%, the temperature of the cold press roller is 130℃, and then the preform is heated at a temperature of 80~90℃ and then stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 45 N / 50m.

[0024] Example 6: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 10 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135℃ to produce molten PE. The molten PP and molten PE are separately injected into a spinning box, and then melt-spun through a spinneret to produce a PE resin sheath and a PP resin core layer, with a core-to-sheath mass ratio of 7:1. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 15 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 4 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 15%, the temperature of the cold press roller is 135℃, and then the preform is heated at 85℃ and stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 48 N / 50m.

[0025] Example 7: A method for preparing an elastic sanitary material, characterized by comprising the following steps: Preparation of the meltblown layer: Isocyanate (diphenylmethane diisocyanate), polyol (polybutylene adipate, molecular weight 2000 g / mol), chain extender (butanediol), and catalyst (dibutyltin dilaurate) were uniformly dispersed in polybutylene adipate. The dispersed isocyanate, polyol, and chain extender were then added to a twin-screw extruder at flow rates of 5.27 g / s, 10.08 g / s, and 1.45 g / s, respectively, along with a catalyst (50 ppm) for reaction. The resulting melt was pumped to the meltblown die to form the meltblown layer. The temperature of the screw reaction zone of the twin-screw extruder was 200–250 °C, the temperature of the meltblown die was 250 °C, the hot air temperature was 250 °C, and the basis weight of the meltblown layer was 13 g / cm³. 2 ; Preparation of the spunbond layer: PP resin (melt flow rate of 14~75 g / 10min) is injected into a screw extruder at 165 ℃ to produce molten PP. PE resin (melt flow rate of 50~100 g / 10min) is injected into a screw extruder at 135 ℃ to produce molten PE. The molten PP and molten PE are then injected into a spinning box, and melt spinning is performed through a spinneret to produce a PE resin outer layer and a PP resin core layer. The melt-spun fibers are then cooled in air to form filaments. These filaments are then cross-distributed with adjacent filaments on a web forming machine by a filament arranging device to form a fiber web, thus creating the spunbond layer. The basis weight of the spunbond layer is 18 g / m². 2 ; Meltblown layer and spunbond layer composite: The spunbond layer prepared above is stacked on the surface of the meltblown layer and needle-punched to form a composite layer. Then, a layer of spunbond fabric is stacked on the surface of the meltblown layer of the composite layer and needle-punched. The needle-punching conditions are: needle-punching density 5 needles / cm², needle-punching direction from the spunbond layer to the meltblown layer. Then, a preform is formed by cold pressing with a cold press roller. The area of ​​the cold pressing point is 16%, the temperature of the cold press roller is 130℃, and then the preform is heated at 90℃ and stretched in the warp and weft directions to form an elastic sanitary material with a tensile strength of 48 N / 50m.

[0026] Comparative Example 1: Compared with Example 1, the composite method in Comparative Example 1 used an ultrasonic welding machine for welding, the weld area of ​​the welding point was 5%, and the other conditions were the same as in Example 1.

[0027] Comparative Example 2: Compared with Example 1, the infrared band hot press roller of the composite method in Comparative Example 2 has a pressing point area of ​​5%, and all other conditions are the same as in Example 1.

[0028] Comparative Example 3: Compared with Example 1, Comparative Example 3 did not use cold pressing treatment, but all other conditions were the same as in Example 1.

[0029] Comparative Example 4: Compared with Example 1, Comparative Example 4 did not use acupuncture treatment, but all other conditions were the same as in Example 1.

[0030] Comparative Example 5: Compared with Example 1, no stretching treatment was performed in Comparative Example 5, and all other conditions were the same as in Example 1.

[0031] Comparative Example 6: Compared with Example 1, the spunbond layer in Comparative Example 6 was made by melt spinning a blend of PP resin and PE resin, and all other conditions were the same as in Example 1.

[0032] Comparative Example 7: Compared with Example 1, the cold pressing temperature of Comparative Example 7 was 80°C, and all other conditions were the same as those of Example 1.

[0033] Comparative Example 8: Compared with Example 1, the cold pressing temperature of Comparative Example 8 was 180°C, and all other conditions were the same as those of Example 1.

[0034] Example of detection: The peel strength, abrasion resistance, breathability, water resistance, and surface smoothness of the elastic sanitary materials prepared in Examples 1 to 7 and Comparative Examples 1 to 8 were tested. The peel strength test method refers to "GB / T8808-1988 T-type peel strength test method for flexible composite plastics", and the instrument used for peel testing is XLW (PC) intelligent electronic tensile testing machine; The air permeability test method refers to "GB / T5453-1997 Textiles - Determination of Air Permeability of Fabrics" for air permeability performance testing; The rubbing resistance test method was as follows: The above elastic sanitary materials were rubbed using a Derrick DRK268 rubbing tester. The rubbing conditions were 155 mm, 440° angle, and 800 cycles. After rubbing, the peel strength and air permeability were tested using the above peel strength and air permeability test methods. The test results are shown in Table 1. Table 1 Test Results Example 1 8.2 8575 7.4 7828 Example 2 7.5 8614 6.6 7949 Example 3 9.2 8491 7.6 7745 Example 4 8.4 8572 7.1 7648 Example 5 7.8 8598 6.9 7641 Example 6 8.2 8541 6.8 7528 Example 7 8.4 8527 6.8 7538 Comparative Example 1 8.4 5421 - - Comparative Example 2 8.2 5829 - - Comparative Example 3 6.5 8726 - - Comparative Example 4 4.8 - - - Comparative Example 5 8.2 8634 - - Comparative Example 6 4.6 - - - Comparative Example 7 4.1 - - - Comparative Example 8 6.8 - - - As shown in Table 1, the air permeability of the elastic sanitary materials prepared in Examples 1 to 7 is between 8527 mm / s and 8614 mm / s, and the peel strength is 7.5 N / M. 2 Up to 9.2 N / M 2It exhibits excellent breathability and composite strength. In the wrinkle resistance test of this elastic sanitary material, after 800 cycles of rubbing, the breathability ranged from 8527 mm / s to 8614 mm / s, and the peel strength remained at 6.6 N / M. 2 Up to 7.4 N / M 2 It is evident that the elastic sanitary material prepared by this invention has excellent resistance to rubbing. After high-intensity rubbing, the composite strength and breathability do not decrease significantly. In addition, after rubbing, the elastic material has no obvious creases or roughness, and its softness and comfort do not change significantly, resulting in an excellent user experience.

[0035] Comparative Examples 1 and 2 were performed using an ultrasonic welding machine and an infrared hot press roller, respectively, for welding and bonding. The results of Comparative Examples 1 and 2 showed that the peel strength of the composite elastic sanitary material was 8.2 N / M. 2 Up to 8.4 N / M 2 The air permeability was only 5421 mm / s to 5829 mm / s. Compared with Example 1, Comparative Examples 1 and 2 showed no significant difference in composite strength, but the air permeability was significantly reduced. In addition, the elastic sanitary materials of Comparative Examples 1 and 2 were damaged after being rubbed. This was due to the welding or the appearance of large weld points. The weld points damaged the surrounding fibers during the rubbing process, resulting in damage to the elastic sanitary materials and poor rubbing resistance.

[0036] In Comparative Example 3, no cold pressing was used; only needle punching and stretching were employed. The results showed that the peel strength of the elastic sanitary material treated only with needle punching was lower, significantly lower than that of the example.

[0037] Comparative Example 4, which did not undergo needle punching treatment but only cold pressing and stretching treatment, showed that the peel strength of the elastic sanitary material treated only with cold pressing and stretching was only 4.8, which was significantly reduced and had a better application effect.

[0038] Comparative Example 5 was not stretched. Although not stretching did not significantly affect breathability and peel strength, pressure point depressions and needle-punch gaps appeared on the surface of the elastic material, resulting in lower adhesion between the elastic material and the skin.

[0039] In Comparative Example 6, the spunbond layer fibers were made from a blend of PP and PE resins. The results showed that the peel strength of Comparative Example 6 was only 4.6 N / M. 2 Further analysis revealed that the spunbond fibers after melt blending were deformed, and their structural strength was significantly reduced. During needle punching, they could not form effective entanglement points inside the meltblown layer, and the fibers used as anchor points were easily broken during peeling.

[0040] Comparative Examples 7 and 8 respectively set up cases where the cold pressing temperature was too low and too high. When the cold pressing temperature was too low, the spunbond fiber skin could not melt, resulting in the inability to form an adhesion at the entanglement point and a significant reduction in peel strength. When the cold pressing temperature was too high, the spunbond fiber would melt completely, and the fiber would break before it entered the meltblown layer during needle punching. After being heated and stretched, the composite points were pulled apart, and the composite strength was significantly reduced.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing an elastic sanitary material, characterized in that, Includes the following steps: An elastic sanitary material is made by laminating a spunbond layer onto the surface of a meltblown layer. The fibers of the spunbond layer have a core-sheath structure, with PE resin as the sheath layer and PP resin as the core layer, and the fibers of the meltblown layer are TPU resin. The composite method includes needle punching, cold pressing, and stretching; The conditions for needle punching include: a needle punching density of 1~5 needles / cm², and a needle punching direction from the spunbond layer to the meltblown layer; The conditions for cold pressing include: the area of ​​the cold pressing point is 3~20%, and the cold pressing temperature is 125~135℃; The stretching conditions include: warp and weft stretching, with a tensile strength of 30~50 N / 50m.

2. The preparation method according to claim 1, characterized in that, The spunbond layer is made by spunbonding PP resin and PE resin.

3. The preparation method according to claim 2, characterized in that, The conditions of the spunbond process include: melting and mixing PP resin to form molten PP, melting and mixing PE resin to form molten PE, injecting molten PP and molten PE into a screw extruder to extrude and form a composite PP / PE melt, injecting the composite PP / PE melt into a spinning device for spinning and stretching to form filaments, and placing the filaments in a web forming device to form a spunbond layer.

4. The preparation method according to claim 1 or 2, characterized in that, The basis weight of the spunbond layer is 5~20 g / m 2 .

5. The preparation method according to claim 1, characterized in that, The mass ratio of the core layer to the cortex is 3~7:

1.

6. The preparation method according to claim 1, characterized in that, The meltblown layer is made by sequentially extruding TPU resin and performing a meltblown process.

7. The preparation method according to claim 6, characterized in that, The TPU resin raw materials include isocyanate, polyol, chain extender and catalyst.

8. The preparation method according to claim 6, characterized in that, The conditions for the screw extrusion reaction include a reaction temperature of 150~220 ℃.

9. The preparation method according to claim 6, characterized in that, The conditions for the meltblown process include: meltblown die head temperature 210~270 ℃, hot air temperature 210~270 ℃, and air pressure 0.1~0.5 MPa.

10. The preparation method according to any one of claims 1 or 6, characterized in that, The basis weight of the meltblown layer is 3~15 g / cm³. 2 .