A low-weight, high-strength non-woven fabric and its preparation method

Abstract

The present application relates to the field of nonwoven products and processes, specifically disclosing a low-weight, high-strength nonwoven fabric and a preparation method thereof. The low-weight, high-strength nonwoven fabric comprises the following raw materials in parts by weight: 105 parts of PP / PE two-component granules; 3-4 parts of masterbatch; and 6-8 parts of a reinforcing component. The reinforcing component comprises polyurea and a reinforcing modifier, wherein the weight ratio of the polyurea to the reinforcing modifier is (11-15):5. The raw materials for preparing the reinforcing modifier comprise tetraethyl orthosilicate and an organic amine. The preparation of the low-weight, high-strength nonwoven fabric comprises the following steps: S1, preparing PP / PE two-component granules; S2, preparing the reinforcing component; S3, placing the PP / PE two-component granules, the masterbatch, and the reinforcing component in a screw extruder, melt-extruding, and forming a fiber web on a mesh curtain; S4, stacking multiple layers of the fiber webs to form a laminated web; and S5, hot-rolling reinforcement. The present application has the effect of improving the mechanical properties of the low-weight nonwoven fabric.

Description

Technical Field

[0001] The present application relates to the field of non-woven products and processes, and in particular to a low-weight, high-strength non-woven fabric and a preparation method thereof. Background Art

[0002] Non-woven fabrics, also known as nonwovens, are made of polypropylene fibers, polyester fibers, polyamide fibers, polyacrylonitrile fibers or viscose fibers, etc., through spunbonding, meltblowing, needle punching or hydroentanglement. They are mainly used in sound insulation, heat insulation, electric heaters, masks, clothing, medical, filling materials and other fields.

[0003] Medical bed sheets are usually made of medical polypropylene non-woven fabrics. The weight of conventional medical bed sheets is generally greater than 25g / m 2 In the related art, in order to reduce material costs and alleviate the pressure of material degradation, the weight of non-woven fabrics for medical bed sheets is reduced to 20g / m2 during the production process. 2 However, when the gram weight is reduced, the mechanical properties of non-woven fabrics for medical bed sheets decrease. During use, because it is inconvenient for patients to get up and lie down, the friction and rubbing force on the medical bed sheets increases, and the medical bed sheets with reduced gram weight are prone to cracking and damage. Summary of the Invention

[0004] In order to improve the mechanical properties of low-weight non-woven fabrics, the present application provides a low-weight, high-strength non-woven fabric and a preparation method thereof.

[0005] In the first aspect, the present application provides a low-weight, high-strength non-woven fabric using the following technical solutions:

[0006] A low-weight, high-strength non-woven fabric comprises the following raw materials in parts by weight: 105 parts of PP / PE two-component granules; 3-4 parts of masterbatch; and 6-8 parts of a reinforcing component; the reinforcing component comprises polyurea and a reinforcing modifier, wherein the weight ratio of the polyurea to the reinforcing modifier is (11-15):5; and the raw materials for preparing the reinforcing modifier comprise tetraethyl orthosilicate and an organic amine.

[0007] The preparation of the reinforcing component comprises the following steps: placing polyurea into a mixture of ethanol and deionized water and stirring evenly; adding an organic amine, adjusting the pH to 8-9 with a pH regulator, and ultrasonically stirring at room temperature for 10-15 minutes; dropping ethyl orthosilicate; standing in an oil bath environment at 30-35° C. for 22-24 hours; and filtering and washing to obtain the reinforcing component.

[0008] By adopting the above technical solution, the reinforcing modifier, polyurea and PP / PE are used in combination. The reinforcing modifier uses polyurea as the attachment point, and ethyl orthosilicate is condensed under the action of organic amine and forms crystals on the polyurea, thereby enhancing the strength and friction resistance of the polyurea; the reinforced polyurea and PP / PE form a three-dimensional network structure, thereby improving the strength and friction resistance of the non-woven fabric and improving the mechanical properties of the low-weight non-woven fabric.

[0009] Optionally, the raw materials for preparing the reinforcing modifier include tetraethyl orthosilicate and organic amine, and the weight ratio of tetraethyl orthosilicate to organic amine is (4-7):1.

[0010] By adopting the above technical solution, part of the organic amine participates in the condensation of ethyl orthosilicate, and the remaining organic amine polymerizes, which improves the adhesion of the crystal to polyurea and the bonding strength between polyurea and PP / PE, thereby improving the mechanical properties of the low-weight non-woven fabric.

[0011] Optionally, the pH regulator is tris(hydroxymethyl)aminomethane.

[0012] By adopting the above technical solution, tris(hydroxymethyl)aminomethane has strong stability and provides a stable alkaline environment for the polymerization of organic amines to condense ethyl orthosilicate.

[0013] Optionally, the PP / PE two-component granules include polypropylene, low-density polyethylene and a compatibilizer, and the weight ratio of the polypropylene, low-density polyethylene and the compatibilizer is (15-17): (5-3):5.

[0014] By adopting the above technical solution, the flexibility of low-density polyethylene is better than that of polypropylene, and the solubility parameters and polarity of low-density polyethylene and polypropylene are similar. Polypropylene is toughened with low-density polyethylene, and the toughness of the prepared two-component pellets is stronger than that of PP pellets; but because polypropylene and low-density polyethylene are both crystalline polymers, the two are blended to form a multiphase system with poor compatibility; the compatibilizer improves the compatibility of polypropylene and low-density polyethylene. Compared with the simple blend of polypropylene and low-density polyethylene, the combination of polypropylene and low-density polyethylene compatibilizer has improved toughness and system tightness, thereby improving the mechanical properties of low-weight non-woven fabrics.

[0015] Optionally, the difference in melt index between the polypropylene and the low-density polyethylene is 10-15.

[0016] By adopting the above technical solution, short fibers prepared from PP / PE two-component granules are laid to form a fiber web. When the fiber web is reinforced by hot pressing, the short fibers curl due to the different melt indexes of polypropylene and low-density polyethylene, thereby improving the fluffiness and air permeability of the fiber web.

[0017] Optionally, the compatibilizer is sarling resin.

[0018] By adopting the above technical solution, sarin resin, polypropylene and low-density polyethylene are used in combination. Sarin resin improves the compatibility of polypropylene and low-density polyethylene; sarin resin acts as a nucleating agent, allowing polypropylene and low-density polyethylene to form a eutectic. When the staple fibers are curled, polypropylene and low-density polyethylene are not easily separated due to curling, thereby improving the stability of the staple fibers and thus improving the mechanical properties of the low-weight non-woven fabric.

[0019] Surin resin, polyurea and tetraethyl orthosilicate organic amine are combined, and the Surin resin molecules and the organic amine molecules are connected through polar adsorption, thereby improving the connection strength between the reinforced modified polyurea and the PP / PE two-component granules and improving the mechanical properties of the low-weight non-woven fabric.

[0020] Optional, low weight, high strength non-woven fabric weighing 13-25g / m 2 .

[0021] By adopting the above technical solution, compared with the conventional weight greater than 25g / m 2 The non-woven fabric prepared in this application has a lower gram weight, which reduces the material cost.

[0022] In a second aspect, the present application provides a method for preparing a low-weight, high-strength non-woven fabric using the following technical solutions:

[0023] A method for preparing a low-weight, high-strength non-woven fabric comprises the following steps:

[0024] S1, preparing PP / PE two-component granules;

[0025] S2, preparing a reinforcing component;

[0026] S3, placing the PP / PE two-component pellets, masterbatch and reinforcing component in a screw extruder, melt-extrude and form a fiber web on a mesh curtain;

[0027] S4, multiple layers of fiber webs are superimposed to form a laminated web;

[0028] S5. Hot rolling reinforcement.

[0029] By adopting the above technical solution, the thickness and grammage of the prepared non-woven fabric can be controlled, and the mechanical properties of the non-woven fabric are improved.

[0030] Optionally, S4 specifically includes the following steps: setting an angle between the length direction of the second layer of fiber web and the width direction of the first layer of fiber web, setting an angle between the length direction of the third layer of fiber web and the width direction of the second layer of fiber web, and stacking the three layers of fiber web in sequence to form a stacked web.

[0031] By adopting the above technical solution, when the patient's body rubs and kneads the medical bed sheet, the non-woven fabric is mostly torn in the horizontal direction. The multi-layer fiber mesh is arranged horizontally and vertically, which improves the horizontal strength of the non-woven fabric and improves the mechanical properties of the low-weight non-woven fabric.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The compatibility of some polypropylene and low-density polyethylene is improved under the action of sarling resin; some polypropylene and low-density polyethylene form a co-core polymer under the action of sarling resin; the two systems co-exist in the raw materials of non-woven fabrics, which improves the toughening modification effect of low-density polyethylene on polypropylene, thereby improving the mechanical properties of low-weight non-woven fabrics;

[0034] 2. Organic amines are adsorbed on the surface of polyurea. Under the action of organic amines, ethyl orthosilicate forms crystals on the surface of polyurea, thereby strengthening and modifying the polyurea. The modified polyurea forms a three-dimensional cross-interpenetrating network structure with polypropylene / low-density polyethylene composite polymer, improving the wear resistance and strength of the low-weight non-woven fabric. The combination of surin resin and organic amines forms connection points on the three-dimensional cross-interpenetrating network structure, improving the stability of the three-dimensional cross-interpenetrating network structure and further improving the mechanical properties of the low-weight non-woven fabric.

[0035] 3. During the hot pressing process, the staple fibers formed by the raw material processing of the non-woven fabric are curled due to the different melt indexes of polypropylene and low-density polyethylene. The compatibility of polypropylene and low-density polyethylene is improved, and they are not easy to separate, which improves the wear resistance and strength of the low-weight non-woven fabric;

[0036] 4. The weight of the non-woven fabric prepared in this application can reach 13-25g / m 2 Compared with the conventional weight of more than 25g / m 2 The non-woven fabric has a lower gram weight, which reduces the material cost. At the same time, compared with the non-woven fabric of conventional gram weight, the mechanical properties are not reduced, which improves the cost performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of the stacked network in the embodiment of the present application;

[0038] Figure 2 This is a partial structural diagram of the laminated web in an embodiment of the present application, showing the second layer of fiber web.

[0039] Description of Reference Numerals

[0040] 1. First layer of fiber mesh; 2. Second layer of fiber mesh; 3. Third layer of fiber mesh. DETAILED DESCRIPTION

[0041] The following examples, comparative examples and Figure 1-2 This application is described in further detail.

[0042] In the following examples, if no specific conditions are specified, the experiments were carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0043] The polypropylene melt index is 35 g / 10 min; the low-density polyethylene melt index is 22 g / 10 min; the Surlyn resin is Surlyn HPD3001; the polyurea bulk density is 0.45 g / ml, and the particle size is 800 mesh; the silicon content of the tetraethyl orthosilicate is 28%-30%; the organic amine is dopamine hydrochloride or dodecylamine, and dopamine hydrochloride is used in this application.

[0044] Example

[0045] Example 1

[0046] S1, take 75kg polypropylene, 25kg low-density polyethylene and 3.5kg sarling resin slices, put into high-speed mixer and fully mix, suction into hopper, enter screw extruder from hopper, set parameters 160 ℃ in zone 1, 165 ℃ in zone 2, 170 ℃ in zone 3, 175 ℃ in zone 4, 180 ℃ in zone 5, 175 ℃ in zone 6, screw pressure 0.1Mpa, screw speed 300rpm; twin-screw extruder extrude rear granulation, obtain PP / PE two-component pellets with a particle size of 3cm after drying;

[0047] S2, 40L of ethanol and 10L of deionized water were mixed evenly as a solvent, 4.5kg of polyurea was added to the solvent and stirred evenly; 0.3% dopamine hydrochloride was added, the pH was adjusted to 8.5 with tris(hydroxymethyl)aminomethane, and ultrasonic stirring was performed at room temperature for 15 minutes; 1.2kg of ethyl orthosilicate was added dropwise, and the mixture was allowed to stand in an oil bath at 30°C for 24 hours; then, the mixture was filtered and washed twice with ethanol and deionized water to obtain a reinforcing component with a particle size of 0.45μm;

[0048] S3, take 105kg of PP / PE two-component pellets prepared by S1 and slice them, feed them into a screw extruder with 3kg of masterbatch and 6kg of reinforcing component prepared by S2, set the melt-blowing temperature to 255℃, and in other embodiments, the melt temperature can be selected in the range of 230-260℃; filter and remove impurities at 255℃, with a filtration accuracy of 300 mesh; spinneret temperature at 230℃; hot air temperature at 255℃, and process hot air flow rate of 200000m 3 / h; forming fibers with a fineness of 3μm, and forming a fiber web in the mesh curtain;

[0049] S4, three layers of fiber mesh are stacked and laid on the mesh curtain in sequence, refer to Figure 1 and Figure 2The first layer of fiber web 1 is laid horizontally, the second layer of fiber web 2 is laid on top of the first layer of fiber web 1, the length direction of the second layer of fiber web 2 is set at an angle of 60° to the length direction of the first layer of fiber web 1, and the second layer of fiber web 2 is folded back and forth along the width direction of the first layer of fiber web 1; the third layer of fiber web 3 is laid on top of the second layer of fiber web 2, and the length direction of the third layer of fiber web 3 is parallel to the length direction of the first layer of fiber web 1, forming a stacked web;

[0050] S5. The mesh curtain is transported to the hot rolling mill. The hot rolling mill temperature is controlled at 145°C, the smooth roller temperature is 150°C, and the rolling mill pressure is 120N / cm 2 , line speed 8m / min, hot rolled reinforced to obtain a density of 20g / m 2 non-woven fabric.

[0051] The implementation principle of the overlay network in this embodiment is:

[0052] The first layer of fiber web 1 is laid horizontally on the conveyor curtain and moves forward along the conveyor curtain in the direction of movement of the conveyor curtain. The second layer of fiber web 2 is placed above the conveyor curtain and reciprocates along the width direction of the conveyor curtain, so that when the second layer of fiber web 2 falls on the first layer of fiber web 1, the length direction of the second layer of fiber web 2 is set at an angle of 60° to the length direction of the first layer of fiber web 1; the third layer of fiber web 3 is laid above the second layer of fiber web 2, and the length direction of the third layer of fiber web 3 is parallel to the length direction of the first layer of fiber web 1, forming a stacked web.

[0053] Example 2-Example 13

[0054] The difference from Example 1 is that the addition amount of each material is different, see Table 1 for details.

[0055] Example 14

[0056] The difference from Example 2 is that the non-woven fabric has a gram weight of 13 g / m 2 .

[0057] Example 15

[0058] The difference from Example 2 is that the non-woven fabric has a weight of 25 g / m 2 .

[0059] Comparative Example

[0060] Comparative Example 1

[0061] S1. Take 105 kg of polypropylene chips and feed them and 3 kg of masterbatch into a screw extruder. Set the melt-blowing temperature to 255 ° C. In other embodiments, the melt temperature can be selected in the range of 230-260 ° C. Filter and remove impurities at 255 ° C, with a filtration accuracy of 300 mesh; Spinning temperature at 230 ° C; Hot air temperature at 255 ° C, and process hot air flow rate of 200000 m 3 / h; forming fibers with a fineness of 3μm, and forming a fiber web in the mesh curtain;

[0062] S2, three layers of fiber mesh are stacked and laid on the mesh curtain in sequence, refer to Figure 1 and Figure 2 The first layer of fiber web 1 is laid horizontally, the second layer of fiber web 2 is laid on top of the first layer of fiber web 1, the length direction of the second layer of fiber web 2 is set at an angle of 60° to the length direction of the first layer of fiber web 1, and the second layer of fiber web 2 is folded back and forth along the width direction of the first layer of fiber web 1; the third layer of fiber web 3 is laid on top of the second layer of fiber web 2, and the length direction of the third layer of fiber web 3 is parallel to the length direction of the first layer of fiber web 1, forming a stacked web;

[0063] S3, the mesh curtain transports the laminated mesh to the hot rolling mill, controls the hot rolling mill temperature at 145℃, the smooth roller temperature at 150℃, and the rolling mill pressure at 120N / cm 2 , line speed 8m / min, hot rolled reinforced to obtain a density of 30g / m 2 non-woven fabric.

[0064] Comparative Example 2

[0065] The difference from Comparative Example 1 is that 20 g / m 2 non-woven fabric.

[0066] Comparative Examples 3-7

[0067] The difference from Example 1 is that the addition amount of each material is different, see Table 1 for details.

[0068] Comparative Example 8

[0069] The difference from Example 2 is:

[0070] S1, take 75kg polypropylene, 25kg low-density polyethylene and 3.5kg sarling resin slices, put into high-speed mixer and fully mix, suction into hopper, enter screw extruder from hopper, set parameters 160 ℃ in zone 1, 165 ℃ in zone 2, 170 ℃ in zone 3, 175 ℃ in zone 4, 180 ℃ in zone 5, 175 ℃ in zone 6, screw pressure 0.1Mpa, screw speed 300rpm; twin-screw extruder extrude rear granulation, obtain PP / PE two-component pellets with a particle size of 3cm after drying;

[0071] S2, 40L of ethanol and 10L of deionized water were mixed evenly as a solvent, 4.5kg of polyurea was added to the solvent and stirred evenly; 0.3% dopamine hydrochloride was added, the pH was adjusted to 8.5 with tris(hydroxymethyl)aminomethane, and ultrasonic stirring was performed at room temperature for 15 minutes; 1.2kg of ethyl orthosilicate was added dropwise, and the mixture was allowed to stand in an oil bath at 30°C for 24 hours; then, the mixture was filtered and washed twice with ethanol and deionized water to obtain a reinforcing component with a particle size of 0.45μm;

[0072] S3, take 105kg of PP / PE two-component pellets prepared by S1 and slice them, feed them into a screw extruder with 3kg of masterbatch and 6kg of reinforcing component prepared by S2, set the melt-blowing temperature to 255℃, and in other embodiments, the melt temperature can be selected in the range of 230-260℃; filter and remove impurities at 255℃, with a filtration accuracy of 300 mesh; spinneret temperature at 230℃; hot air temperature at 255℃, and process hot air flow rate of 200000m 3 / h; forming fibers with a fineness of 3μm, and forming a fiber web in the mesh curtain;

[0073] S4, the web is transported to the hot rolling mill, and the temperature of the hot rolling mill is controlled at 145°C, the temperature of the smooth roller is 150°C, and the rolling mill pressure is 120N / cm 2 , line speed 8m / min, hot rolled reinforced to obtain a density of 20g / m 2 non-woven fabric.

[0074] Comparative Example 9

[0075] The difference from Example 2 is:

[0076] S4. Three layers of fiber webs are arranged in parallel and stacked in sequence on a web curtain to form a stacked web.

[0077] Table 1 Raw materials of Examples and Comparative Examples (kg)

[0078]

[0079]

[0080] Performance testing

[0081] Test methods

[0082] 1. The hydrostatic pressure (cmH2O) of the nonwoven fabric was measured using the method in GB / T 24218.16-2017 Textiles—Nonwoven Fabrics Test Methods—Part 16 Determination of Water Resistance (Hydrostatic Pressure Method). The water pressure was applied above the sample, the experimental water temperature was (23±2)°C, the water pressure rise rate was (10±0.5) cmH2O / min, and 5 samples were tested under standard atmospheric pressure. The results were averaged. The test results are shown in Table 2.

[0083] 2. The breaking strength (N) of nonwoven fabrics was measured using the method in GB / T 24218.3-2010 Textiles - Nonwoven Fabrics Test Methods Part 3 Determination of Breaking Strength and Elongation at Break. The water pressure was applied above the sample, the experimental water temperature was (23±2)°C, the water pressure rise rate was (10±0.5) cmH2O / min, and 5 samples were tested under standard atmospheric pressure. The results were averaged. The test results are shown in Table 2.

[0084] Table 2 Test results of various embodiments and comparative examples

[0085]

[0086] In combination with Example 1, Example 2 and Example 3 and Table 2, the hydrostatic pressure and breaking strength of the non-woven fabric were improved by adjusting the types and addition amounts of the PP / PE two-component pellets, the masterbatch and the reinforcing component.

[0087] Comparative Example 1 is 30g / m2 processed from polypropylene and masterbatch. 2 Non-woven fabric, Example 2 is the application of low-density polyethylene modified polypropylene, and added with reinforcing components to improve the impact resistance and strength of the non-woven fabric, combined with Example 2 and Comparative Example 1 and Table 2, this application prepares 20g / m 2 The low-weight, high-strength non-woven fabric has no significant reduction in hydrostatic pressure and breaking strength.

[0088] Comparative Example 2 is 20g / m2 processed from polypropylene and masterbatch. 2 Non-woven fabric, combined with Example 2 and Comparative Example 2 and Table 2, this application prepares 20g / m 2 Low weight and high strength non-woven fabric, compared with 20g / m 2 The hydrostatic pressure and breaking strength of non-woven fabrics are significantly improved.

[0089] Combining Example 2 and Comparative Example 3 with Table 2, it can be seen that the addition of the reinforcing component effectively improves the hydrostatic pressure and breaking strength of the nonwoven fabric. The reinforcing component includes polyurea and a reinforcing modifier. The reinforcing modifier is adsorbed and fixed to the polyurea, increasing the strength of the polyurea. The modified polyurea forms a three-dimensional interpenetrating network structure with the polypropylene / low-density polyethylene composite polymer, increasing the hydrostatic pressure and breaking strength of the low-weight nonwoven fabric, thereby making the nonwoven fabric less susceptible to damage due to friction and rubbing.

[0090] Combining Example 2, Example 4 and Example 5 with Table 2, it can be seen that with the increase in the amount of reinforcing component added, the hydrostatic pressure and breaking strength of the non-woven fabric first increase and then decrease.

[0091] As can be seen from Example 2 and Comparative Example 4, along with Table 2, the addition of a reinforcing modifier to the reinforcing component effectively improves the hydrostatic pressure and breaking strength of the nonwoven fabric. The reinforcing component includes tetraethyl orthosilicate and dopamine hydrochloride. The dopamine hydrochloride is thoroughly mixed with the polyurea and adsorbed onto the polyurea. Under polycondensation conditions such as dopamine hydrochloride and an alkaline environment, the tetraethyl orthosilicate forms crystals on the polyurea surface, enhancing the strength of the polyurea and thus increasing the connection strength of the three-dimensional interpenetrating network structure, thereby improving the hydrostatic pressure and breaking strength of the nonwoven fabric.

[0092] Combining Examples 2, 6, and 7 with Table 2, it can be seen that as the amount of polyurea added increases, the hydrostatic pressure and breaking strength of the nonwoven fabric first increase and then decrease. Increasing the amount of polyurea added increases the solidification rate of the staple fibers, causing some of them to solidify before being sprayed onto the web curtain. This results in low bond strength between the staple fibers in the web on the web curtain, and reduces the hydrostatic pressure and breaking strength of the nonwoven fabric.

[0093] Combining Examples 2, 8, and 9 with Table 2, it can be seen that as the amount of reinforcing modifier added increases, the hydrostatic pressure and breaking strength of the nonwoven fabric first increase and then decrease. The reinforcing modifier raw materials include tetraethyl orthosilicate and dopamine hydrochloride. Under the action of dopamine hydrochloride, tetraethyl orthosilicate condenses on polyurea to form silicon-containing crystals, which increases the strength of the polyurea. The three-dimensional network structure formed by the polyurea and polypropylene / polyethylene is not easily broken, thereby improving the hydrostatic pressure and breaking strength of the nonwoven fabric.

[0094] Combining Examples 2, 10, and 11 with Table 2, it can be seen that as the ratio of tetraethyl orthosilicate to dopamine hydrochloride in the reinforcing modifier increases, the hydrostatic pressure and breaking strength of the non-woven fabric first increase and then decrease. Some dopamine hydrochloride forms polydopamine, and the three-dimensional network structure formed by polydopamine, polyurea, and polypropylene / polyethylene is more solid, thereby improving the hydrostatic pressure and breaking strength of the non-woven fabric. As the ratio of tetraethyl orthosilicate to dopamine hydrochloride increases, the amount of dopamine hydrochloride not incorporated into the tetraethyl orthosilicate decreases, the polydopamine content decreases, and the hydrostatic pressure and breaking strength of the non-woven fabric decrease.

[0095] Combining Example 2 and Comparative Example 5 with Table 2, it can be seen that the addition of low-density polyethylene and the compatibilizer effectively improves the hydrostatic pressure and breaking strength of the non-woven fabric.

[0096] Combining Example 2 and Comparative Example 6 with Table 2, it can be seen that the addition of low-density polyethylene effectively improves the hydrostatic pressure and breaking strength of the non-woven fabric.

[0097] Combining Example 2, Example 12 and Example 13 and Table 2, it can be seen that as the ratio of polypropylene to low-density polyethylene in the PP / PE two-component pellets increases, the hydrostatic pressure and breaking strength of the non-woven fabric first increase and then decrease.

[0098] Combining Example 2 with Comparative Example 7 and Table 2 shows that the addition of sarling resin effectively improves the hydrostatic pressure and breaking strength of the nonwoven fabric. The combination of sarling resin and organic amine forms connection points within the three-dimensional cross-interpenetrating network structure, enhancing the stability of the three-dimensional cross-interpenetrating network and further improving the mechanical properties of the low-weight nonwoven fabric. Combining Example 2 with Comparative Example 4 and Table 2 shows that the addition of a reinforcing modifier to the reinforcing component effectively improves the hydrostatic pressure and breaking strength of the nonwoven fabric.

[0099] Comparative Example 8 uses a single-layer fiber web thermally bonded to form a 20g / m 2 Non-woven fabric, combined with Example 2 and Comparative Example 8 and combined with Table 2, it can be seen that the three-layer process is set.

[0100] Comparative Example 9 uses three layers of fiber web stacked in parallel and then thermally bonded to form a 20g / m 2 Non-woven fabric, combined with Example 2 and Comparative Example 8 and combined with Table 2, it can be seen that the setting of the second layer fiber web process of this application.

[0101] Combining Example 2, Example 14, and Example 15 with Table 2, it can be seen that as the weight of the non-woven fabric increases, the hydrostatic pressure and breaking strength of the non-woven fabric are improved, and the weight of the non-woven fabric prepared in Comparative Example 1 is 13 g / m 2 The hydrostatic pressure and breaking strength losses of the nonwoven fabric are not significant.

[0102] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A low-weight, high-strength non-woven fabric, characterized in that: The raw materials include the following parts by weight: 105 parts of PP / PE two-component granules; 3-4 parts of masterbatch; 6-8 parts of reinforcing component; the reinforcing component includes polyurea and reinforcing modifier, and the weight ratio of polyurea to reinforcing modifier is (11-15):5; the raw materials for preparing the reinforcing modifier include tetraethyl orthosilicate and organic amine; The preparation of the reinforcing component comprises the following steps: placing polyurea into a mixture of ethanol and deionized water and stirring evenly; adding an organic amine, adjusting the pH to 8-9 with a pH regulator, and ultrasonically stirring at room temperature for 10-15 minutes; dropping ethyl orthosilicate; standing in an oil bath environment at 30-35° C. for 22-24 hours; and filtering and washing to obtain the reinforcing component.

2. The low-weight, high-strength non-woven fabric according to claim 1, characterized in that: The weight ratio of the ethyl orthosilicate to the organic amine is (4-7):

1.

3. The low-weight, high-strength non-woven fabric according to claim 1, characterized in that: The pH regulator is tris(hydroxymethyl)aminomethane.

4. The low-weight, high-strength non-woven fabric according to claim 1, characterized in that: The PP / PE two-component granules include polypropylene, low-density polyethylene and a compatibilizer, and the weight ratio of the polypropylene, low-density polyethylene and the compatibilizer is (15-17): (5-3):

5.

5. The low-weight, high-strength non-woven fabric according to claim 4, characterized in that: The difference in melt index between the polypropylene and the low-density polyethylene is 10-15.

6. The low-weight, high-strength non-woven fabric according to claim 5, characterized in that: The polypropylene melt index is 35 g / 10 min, and the low-density polyethylene melt index is 22 g / 10 min.

7. The low-weight, high-strength non-woven fabric according to claim 4, characterized in that: The compatibilizer is sarling resin.

8. The low-weight, high-strength non-woven fabric according to claim 1, characterized in that: Low weight and high strength non-woven fabric weighs 13-25g / m 2 .

9. The method for preparing a low-weight, high-strength non-woven fabric according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, preparing PP / PE two-component granules; S2, preparing a reinforcing component; S3, placing PP / PE two-component pellets, masterbatch and reinforcing components in a screw extruder, melt-extrude and form a fiber web on a mesh curtain; S4, multiple layers of fiber webs are superimposed to form a laminated web; S5. Hot rolling reinforcement.

10. The method for preparing a low-weight, high-strength non-woven fabric according to claim 9, characterized in that: S4 specifically includes the following steps: the length direction of the second layer of fiber mesh (2) is set at an angle with the width direction of the first layer of fiber mesh (1), the length direction of the third layer of fiber mesh (3) is set parallel to the length direction of the first layer of fiber mesh (1), and the three layers of fiber mesh are stacked in sequence to form a stacked mesh.

Images