A method for processing polyethylene nonwoven paper

Abstract

The present application relates to a kind of polyethylene non-woven paper processing method, comprising the technical steps of: dissolving spinning raw material in spinning solvent for dispersion and dissolution to obtain spinning solution, then the spinning solution is carried out flash spinning at 170-240 DEG C, the flash fiber is laid, and finally the polyethylene non-woven paper is obtained by hot-pressing process and burnishing process through hot roller.The application can significantly improve the antibacterial and mildew-proof effect of the final product by adding fungicide, to prolong its service life and expand its use range.

Description

[Technical Field]

[0001] This invention relates to the field of flash evaporation technology, specifically, to a processing method for polyethylene nonwoven paper. [Background Technology]

[0002] Nonwoven paper is a typical example of high-performance paper, characterized by its resistance to bubbling, curling, and peeling during use. Another advantage is its waterproof and breathable properties, making it superior to ordinary paper in extreme conditions such as military maps, outdoor environments, and rainy seasons. This application utilizes flash evaporation technology to prepare nonwoven paper that combines the properties of textiles, paper, and film. While maintaining printability, the addition of antifungal and antimicrobial additives enhances the product's antibacterial and antimicrobial properties, expanding its application areas and extending its lifespan. For flash-evaporated composite materials, DuPont's patents serve as an example; DuPont patents typically define products based on performance parameters to achieve broader protection.

[0003] Chinese Patent Publication No. CN109154138A relates to a composite laminate comprising at least one water vapor permeable nonwoven sheet having first and second surfaces and a fluorinated polymer coating on the first surface of the sheet, wherein (i) the fluorinated polymer coating is present such that the total fluorine content of the coated nonwoven sheet is from 0.05 gsm to no more than 0.4 gsm, and (ii) the composite laminate exhibits a retention water pressure head of at least 60% when tested according to test method A after exposure to wet wood.

[0004] Chinese Patent Publication No. CN112549713A relates to a sheet material formed from a spinning unit having a nominal Fraser permeability between 0.002 m / m·min@50 gsm and 0.2 m / m·min@50 gsm, and a nominal hydrostatic head between 150 cm@50 gsm and 250 cm@50 gsm, wherein the sheet material formed from the spinning unit has a BET surface area between 9 m / gm and 25 m / gm; wherein the overlapping, multi-oriented, tufted membrane-fiber network is flash-spun from a spinning fluid comprising a polymer and a spinning agent, the spinning fluid temperature being 190°C or higher; the spinning agent is composed of chloromethane and hydrofluorocarbons, and the polymer concentration of the spinning fluid is 14% by weight or less.

[0005] Chinese Patent Publication No. CN109070534 relates to an unconsolidated impact- and penetration-resistant laminate comprising a plurality of cross-laminated sheets, each cross-laminated sheet further comprising (i) first and second fibrous or non-fibrous ultra-high molecular weight polyethylene layers and (ii) first and second thermoplastic adhesive layers, each adhesive layer having a basis weight of not more than 5 gsm, wherein the thermoplastic adhesive has a zero shear rate viscosity of at least 1500 Pa-s as measured by ASTM D 4440, and wherein (a) the polyethylene layers and the thermoplastic adhesive layers alternate within the sheets, (b) more than 50% of the polyethylene layers are arranged such that the orientation of the first polyethylene layer is offset relative to the orientation of the second polyethylene layer, and (c) the plurality of cross-laminated sheets form a stack that, when subjected to compression at a pressure of 255 bar and a temperature of 132°C, does not suffer a pressure loss of more than 8 bar within the first two minutes of compaction under Test Method B. [Summary of the Invention]

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for processing polyethylene nonwoven paper.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A type of polyethylene nonwoven paper, the raw material of which includes polyethylene; basis weight is 45-95 g / cm³. 2 ;

[0009] The standard cold shrinkage strength σ of polyethylene nonwoven paper is 1.5~4.5N / mm. 2 ;

[0010] The mildew resistance rating of polyethylene nonwoven paper is less than or equal to level 1;

[0011] in:

[0012] The standard cold shrinkage strength is σ = [F / S] * [actual weight / 50g / m²]. 2 ];

[0013] S is the initial cross-sectional area of ​​the sample;

[0014] F represents the force of cold contraction.

[0015] The standard cold shrinkage strength σ of polyethylene nonwoven paper is 1.5~2.5N / mm. 2 .

[0016] The standard cold shrinkage strength σ of polyethylene nonwoven paper is 2.5~4.5N / mm. 2 .

[0017] A polyethylene nonwoven paper has a transverse shrinkage ratio (CR) of 0.25–0.45 and a longitudinal shrinkage ratio (MR) of 0.60–0.85, with MR / CR greater than 1.

[0018] in:

[0019] Longitudinal shrinkage rate MR=[(ML0-ML1) / ML0];

[0020] Lateral shrinkage rate CR = [(CL0-CL1) / CL0];

[0021] ML0 is the initial length of the longitudinal sample;

[0022] ML1 is the length of the longitudinal sample after shrinkage;

[0023] CL0 is the initial length of the transverse sample;

[0024] CL1 is the length of the transverse sample after shrinkage;

[0025] The transverse shrinkage rate (CR) of polyethylene nonwoven paper is 0.25–0.35.

[0026] The transverse shrinkage rate (CR) of polyethylene nonwoven paper is 0.35–0.45.

[0027] The longitudinal shrinkage rate (MR) of polyethylene nonwoven paper is 0.6–0.75.

[0028] The longitudinal shrinkage rate (MR) of polyethylene nonwoven paper is 0.75–0.85.

[0029] The MR / CR of polyethylene nonwoven paper is greater than 1.2.

[0030] The MR / CR of polyethylene nonwoven paper is greater than 1.4.

[0031] The MR / CR of polyethylene nonwoven paper is greater than 1.6.

[0032] The MR / CR of polyethylene nonwoven paper is less than 4.

[0033] The MR / CR of polyethylene nonwoven paper is less than 3.

[0034] A type of polyethylene nonwoven paper with a standard longitudinal tear strength MP of 9–12.5 kN / m.

[0035] in:

[0036] MP = [MF / d] * [Actual weight / 50g / m³] 2 ];

[0037] MF is the tearing force of the longitudinal sample (in Newtons), and d is the thickness of the longitudinal sample (in millimeters).

[0038] The average force generated when a crack traverses a longitudinal sample at a speed of 200 mm / min is the tearing force MF of the longitudinal sample.

[0039] The standard longitudinal tear strength (MP) of polyethylene nonwoven paper is 9–10.5 kN / m.

[0040] The standard longitudinal tear strength (MP) of polyethylene nonwoven paper is 11–12.5 kN / m.

[0041] A type of polyethylene nonwoven paper with a basis weight of 45–95 g / cm³ 2 .

[0042] The preferred basis weight of polyethylene nonwoven paper is 50–65 g / cm³. 2 .

[0043] The preferred basis weight of polyethylene nonwoven paper is 65–75 g / cm³. 2 .

[0044] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0045] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170–240°C. The flash-spun fibers are laid into a web, and finally, polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0046] The spinning raw material is polyethylene and anti-mildew additives;

[0047] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0048] The antifungal agent has a mass fraction of 3-5% in the spinning raw material;

[0049] The mass fraction of the spinning raw material in the spinning solution is 10-12%;

[0050] The hot pressing temperature is 105-115℃, and the hot stamping temperature is 105-115℃.

[0051] The spinning solvent is selected from several mixtures of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, nitriles, amides, and fluorocarbons.

[0052] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0053] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0054] The process of the two-stage calcination is as follows: the first calcination temperature is 130-150℃, the holding time is 30-80 minutes, and then the second calcination is carried out at a heating rate of 5℃ / min, the second calcination temperature is 600-700℃, and the holding time is 2-4 hours.

[0055] Third calcination: calcination temperature is 450-500℃, and holding time is 2-3 hours.

[0056] The mass ratio of copper sulfate to zinc sulfate is 1:1.5 to 1:2.5.

[0057] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:2.5 to 1:3.5.

[0058] The mass fraction of the mixture in the boric acid solution is 2-5%.

[0059] The boric acid mass fraction in the boric acid solution is 8-15%.

[0060] The aggregated state of single-walled carbon nanotubes provides them with various pore structure features. The angular structure also gives single-walled carbon nanotubes a large number of defects, resulting in high purity, large specific surface area, and an open structure that facilitates the diffusion of small molecules. The purity of single-walled carbon nanotubes is >97%; the aggregate particle size of single-walled carbon nanotubes is 30–100 nanometers.

[0061] Single-walled carbon nanotubes are dispersed in an alkaline solution. The surface is treated with alkali to facilitate the subsequent adsorption reaction with metal ions in a mixed solution of copper sulfate and zinc sulfate, maintaining an excess of alkali. The alkaline solution is sodium hydroxide or potassium hydroxide, etc. The antifungal and antibacterial functional material consists of zinc borate doped with cuprous oxide loaded onto a boron nitride matrix. The zinc borate doped with cuprous oxide possesses both antifungal and antibacterial properties. Boron nitride has a large specific surface area and porous characteristics, thus exhibiting slow-release antifungal and antibacterial effects. This application demonstrates superior antifungal and antibacterial effects compared to a simple mixture of raw materials (cuprous oxide and zinc borate).

[0062] As the content of antifungal agents in a product gradually increases, its mechanical properties are significantly improved. However, excessive amounts can lead to agglomeration, which in turn reduces its performance. Therefore, it is essential to select an appropriate addition range to obtain optimal material properties. This is the fundamental reason why this application selected this range (3-5% by mass of antifungal agent in the spinning raw material).

[0063] Compared with the prior art, the positive effects of the present invention are:

[0064] By adding an antifungal agent, this application can significantly improve the antibacterial and antifungal effects of the final product, thereby extending its service life and expanding its application range.

Detailed Implementation Methods

[0065] The following provides a specific embodiment of a processing method for polyethylene nonwoven paper according to the present invention.

[0066] Example 1

[0067] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0068] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0069] The spinning raw material is polyethylene and anti-mildew additives;

[0070] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0071] The anti-mildew agent has a mass fraction of 3% in the spinning raw material;

[0072] The mass fraction of the spinning raw material in the spinning solution is 10%;

[0073] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0074] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0075] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0076] The process of the two-stage calcination is as follows: the first calcination temperature is 130-150℃, the holding time is 30-80 minutes, and then the second calcination is carried out at a heating rate of 5℃ / min, the second calcination temperature is 600-700℃, and the holding time is 2-4 hours.

[0077] Third calcination: calcination temperature is 450-500℃, and holding time is 2-3 hours.

[0078] The mass ratio of copper sulfate to zinc sulfate is 1:1.5.

[0079] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:2.5.

[0080] The mass fraction of the mixture in the boric acid solution is 2%.

[0081] The boric acid solution contains 10% boric acid by mass.

[0082] The test method for polyethylene nonwoven paper in this application:

[0083] 1. Standard cold shrinkage strength test: The test is conducted according to the national standard GB / T 34848-2017. Specifically, the test measures the cold shrinkage force F generated by the sample during the cold shrinkage process and the initial area S of the sample. Five sets of transverse samples and five sets of longitudinal samples are tested respectively, and then the overall average is calculated. Finally, the standard cold shrinkage strength is calculated as σ = [F / S] * [actual weight / 50g / m²]. 2 The standard cold shrinkage strength of the sample was obtained.

[0084] 2. Mildew resistance test: The test was conducted in accordance with the national standard GB / T 24346-2009. The strains used in the test were: Aspergillus niger CGMCC3.5487, Chaetomium globulus CGMCC3.3601, Penicillium cordiformis CGMCC3.3875, and Trichoderma viride CGMCC3.2941. The test environment conditions were 28℃, 90% humidity, and the incubation time was 28 days.

[0085] 3. Test of longitudinal shrinkage rate: The test shall be conducted in accordance with the national standard GB / T 34848-2017. Specifically, longitudinal samples shall be taken for testing. The initial length ML0 and the length after shrinkage ML1 shall be recorded separately. Ten groups shall be tested and the average shall be calculated. The longitudinal shrinkage rate of the sample shall be obtained by using the formula: Longitudinal shrinkage rate MR=[(ML0-ML1) / ML0].

[0086] 4. Test of transverse shrinkage rate: The test shall be conducted in accordance with the national standard GB / T 34848-2017. Specifically, transverse samples shall be taken for testing. The initial length ML0 and the length after shrinkage ML1 shall be recorded separately. Ten transverse samples shall be taken for testing and the average shall be calculated. The transverse shrinkage rate of the sample shall be calculated according to the formula: transverse shrinkage rate CR=[(CL0-CL1) / CL0].

[0087] 5. Standard longitudinal tear strength test: The test shall be conducted in accordance with the national standard GB / T 16578.1-2008 / ISO6383-1:1983. Longitudinal samples shall be used for testing, where MF is the longitudinal tear force and d is the longitudinal sample thickness. Ten transverse samples shall be tested and averaged. The result shall be calculated using the formula: MP = [MF / d] * [actual weight / 50g / m²]. 2 The standard longitudinal tear strength was calculated.

[0088] 6. Whiteness test: Whiteness is obtained by measuring the CIE tristimulus values ​​in accordance with the national standard GB / T22880-2008 (Determination of CIE whiteness of paper and paperboard, D65 / 10° outdoor daylight) under the conditions specified in the standard.

[0089] 7. Antibacterial performance testing: The test was conducted according to the national standard GB / T 20944.2-2007. Specific bacterial strains used in the antibacterial test were Staphylococcus aureus, Klebsiella pneumoniae, and Escherichia coli. Culture conditions: 37℃±2℃, 90%±2%; culture time: 18-24 hours. The antibacterial rate (i.e., the inhibition rate) indicates that above 95% exhibits antibacterial properties, and a rate greater than 99% indicates optimal antibacterial function.

[0090] The test results of the polyethylene nonwoven paper in Example 1 are shown in Table 1.

[0091] Example 2

[0092] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0093] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0094] The spinning raw material is polyethylene and anti-mildew additives;

[0095] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0096] The anti-mildew agent has a mass fraction of 3.5% in the spinning raw material;

[0097] The mass fraction of the spinning raw material in the spinning solution is 10.5%;

[0098] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0099] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0100] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0101] The mass ratio of copper sulfate to zinc sulfate is 1:1.75.

[0102] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:2.75.

[0103] The mass fraction of the mixture in the boric acid solution is 2.5%.

[0104] The boric acid solution contains 10% boric acid by mass.

[0105] The testing method for polyethylene nonwoven paper in Example 2 is the same as that in Example 1, and the test results are shown in Table 1.

[0106] Example 3

[0107] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0108] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0109] The spinning raw material is polyethylene and anti-mildew additives;

[0110] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0111] The anti-mildew agent has a mass fraction of 4% in the spinning raw material;

[0112] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0113] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0114] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0115] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0116] The mass ratio of copper sulfate to zinc sulfate is 1:2.

[0117] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:3.

[0118] The mass fraction of the mixture in the boric acid solution is 3%.

[0119] The boric acid solution contains 10% boric acid by mass.

[0120] The testing method for polyethylene nonwoven paper in Example 3 is the same as that in Example 1, and the test results are shown in Table 1.

[0121] The anti-mildew nonwoven paper prepared in Example 3 was placed in a room temperature environment for 6 months, specifically at a temperature of 30±2°C and a humidity of (70±5)%RH. The sample was tested again and found to have an anti-mildew rating of 0, an antibacterial rate of 98.5%, a low decrease in antibacterial performance, and no change in anti-mildew performance, thus providing long-term slow-release antibacterial and anti-mildew effects.

[0122] Example 4

[0123] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0124] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0125] The spinning raw material is polyethylene and anti-mildew additives;

[0126] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0127] The anti-mildew agent has a mass fraction of 4.5% in the spinning raw material;

[0128] The mass fraction of the spinning raw material in the spinning solution is 11.5%;

[0129] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0130] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0131] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0132] The mass ratio of copper sulfate to zinc sulfate is 1:2.25.

[0133] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:3.25.

[0134] The mass fraction of the mixture in the boric acid solution is 4.5%.

[0135] The boric acid solution contains 10% boric acid by mass.

[0136] The testing method for polyethylene nonwoven paper in Example 4 is the same as that in Example 1, and the test results are shown in Table 1.

[0137] Example 5

[0138] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0139] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0140] The spinning raw material is polyethylene and anti-mildew additives;

[0141] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0142] The anti-mildew agent has a mass fraction of 5% in the spinning raw material;

[0143] The mass fraction of the spinning raw material in the spinning solution is 12%;

[0144] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0145] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0146] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0147] The mass ratio of copper sulfate to zinc sulfate is 1:2.5.

[0148] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:3.5.

[0149] The mass fraction of the mixture in the boric acid solution is 5%.

[0150] The boric acid solution contains 10% boric acid by mass.

[0151] The testing method for polyethylene nonwoven paper in Example 5 is the same as that in Example 1, and the test results are shown in Table 1.

[0152] Comparative Example 1

[0153] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0154] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0155] The spinning raw material is polyethylene and anti-mildew additives;

[0156] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0157] The anti-mildew agent has a mass fraction of 4% in the spinning raw material;

[0158] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0159] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0160] The anti-mildew agent is a mixture of single-walled carbon nanotubes, cuprous oxide, and zinc borate; wherein the mass ratio of the three is 3:1:2.

[0161] The testing method for polyethylene nonwoven paper in Comparative Example 1 is the same as that in Example 1, and the test results are shown in Table 1.

[0162] Comparative Example 2

[0163] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0164] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0165] The spinning raw material is polyethylene and anti-mildew additives;

[0166] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0167] The anti-mildew agent has a mass fraction of 4% in the spinning raw material;

[0168] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0169] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0170] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0171] Single-walled carbon nanotubes were dispersed in an alkaline solution, then added to a zinc sulfate solution. The mixture was filtered and separated, then ground and calcined a second time to obtain another mixture. The mixture was then added to a boric acid solution, filtered and separated, and then calcined a third time to obtain an antifungal agent.

[0172] The mass ratio of zinc sulfate to single-walled carbon nanotubes is 2:3.

[0173] The mass fraction of the mixture in the boric acid solution is 3%.

[0174] The boric acid solution contains 10% boric acid by mass.

[0175] The testing method for polyethylene nonwoven paper in Comparative Example 2 is the same as that in Example 1, and the test results are shown in Table 1.

[0176] The anti-mildew nonwoven paper prepared in Comparative Example 2 was placed in a room temperature environment for 6 months, specifically at a temperature of 30±2°C and a humidity of (70±5)%RH. The anti-mildew grade of the sample was tested again and found to be level 3, with an antibacterial rate of 82.4%. The antibacterial performance decreased significantly, while the anti-mildew performance decreased relatively little, thus providing long-term slow-release antibacterial and anti-mildew effects.

[0177] Comparative Example 3

[0178] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0179] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0180] The spinning raw material is polyethylene and anti-mildew additives;

[0181] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0182] The anti-mildew agent has a mass fraction of 1% in the spinning raw material;

[0183] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0184] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0185] The processing method of the anti-mildew additive is the same as in Example 3.

[0186] The testing method for polyethylene nonwoven paper in Comparative Example 3 is the same as that in Example 1, and the test results are shown in Table 1.

[0187] Comparative Example 4

[0188] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0189] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0190] The spinning raw material is polyethylene and anti-mildew additives;

[0191] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0192] The anti-mildew agent has a mass fraction of 2% in the spinning raw material;

[0193] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0194] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0195] The processing method of the anti-mildew additive is the same as in Example 3.

[0196] The testing method for polyethylene nonwoven paper in Comparative Example 4 is the same as that in Example 1, and the test results are shown in Table 1.

[0197] Comparative Example 5

[0198] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0199] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0200] The spinning raw material is polyethylene and anti-mildew additives;

[0201] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0202] The anti-mildew agent has a mass fraction of 6% in the spinning raw material;

[0203] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0204] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0205] The processing method of the anti-mildew additive is the same as in Example 3.

[0206] The testing method for the polyethylene nonwoven paper in Comparative Example 5 is the same as that in Example 1, and the test results are shown in Table 1.

[0207] Comparative Example 6

[0208] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0209] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0210] The spinning raw material is polyethylene and anti-mildew additives;

[0211] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0212] The anti-mildew agent has a mass fraction of 7% in the spinning raw material;

[0213] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0214] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0215] The processing method of the anti-mildew additive is the same as in Example 3.

[0216] The testing method for the polyethylene nonwoven paper in Comparative Example 6 is the same as that in Example 1, and the test results are shown in Table 1.

[0217] Comparative Example 7

[0218] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0219] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0220] The spinning raw material is polyethylene and anti-mildew additives;

[0221] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0222] The anti-mildew agent has a mass fraction of 8% in the spinning raw material;

[0223] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0224] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0225] The processing method of the anti-mildew additive is the same as in Example 3.

[0226] The testing method for the polyethylene nonwoven paper in Comparative Example 7 is the same as that in Example 1, and the test results are shown in Table 1.

[0227] Comparative Example 8

[0228] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0229] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0230] The spinning raw material is polyethylene and anti-mildew additives;

[0231] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0232] The anti-mildew agent has a mass fraction of 4% in the spinning raw material;

[0233] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0234] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0235] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0236] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0237] The mass ratio of copper sulfate to zinc sulfate is 1:2.

[0238] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:4.

[0239] The mass fraction of the mixture in the boric acid solution is 3%.

[0240] The boric acid solution contains 10% boric acid by mass.

[0241] The testing method for the polyethylene nonwoven paper in Comparative Example 8 is the same as that in Example 1, and the test results are shown in Table 1.

[0242] Comparative Example 9

[0243] A method for processing polyethylene nonwoven paper, comprising the following technical solution:

[0244] The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the polyethylene nonwoven paper is obtained by hot pressing and calendering with hot rollers.

[0245] The spinning raw material is polyethylene and anti-mildew additives;

[0246] The anti-mildew agent is a composite single-walled carbon nanoparticle corner.

[0247] The anti-mildew agent has a mass fraction of 4% in the spinning raw material;

[0248] The mass fraction of the spinning raw material in the spinning solution is 11%;

[0249] The spinning solvent is: dichloromethane, 1,2-dichloro-1,2,2-trifluoroethane, 2,3-dihydrodecafluoropentane, and 1,1,1,3,3-pentafluorobutane, with a mass ratio of 7:1:1:1.

[0250] The processing method of the aforementioned antifungal agent includes the following technical steps:

[0251] Single-walled carbon nanotubes are dispersed in an alkaline solution, then added to a mixed solution of copper sulfate and zinc sulfate. The mixture is separated by filtration, then ground and calcined a second time to obtain another mixture. The mixture is then added to a boric acid solution, filtered, and calcined a third time to obtain an antifungal agent.

[0252] The mass ratio of copper sulfate to zinc sulfate is 1:2.

[0253] The mass ratio of copper sulfate to single-walled carbon nanotubes is 1:4.5.

[0254] The mass fraction of the mixture in the boric acid solution is 3%.

[0255] The boric acid solution contains 10% boric acid by mass.

[0256] The testing method for the polyethylene nonwoven paper in Comparative Example 9 is the same as that in Example 1, and the test results are shown in Table 1.

[0257] Table 1 Performance Test Table for Polyethylene Nonwoven Paper

[0258] σ Anti-mildew rating CR MR MP Whiteness Antibacterial rate Example 1 2.5 1 0.31 0.62 9.5 88.1％ 98.5％ Example 2 2.7 1 0.35 0.68 10.6 87.0％ 99.1％ Example 3 3.5 0 0.37 0.72 11.5 85.7％ 99.2％ Example 4 3.1 0 0.41 0.79 11.9 84.3％ 99.5％ Example 5 2.9 0 0.42 0.83 12.1 83.2％ 99.6％ Comparative Example 1 2.2 4 0.21 0.46 7.1 91.5％ 78.0％ Comparative Example 2 3.4 2 0.36 0.70 11.0 84.8％ 94.1％ Comparative Example 3 2.0 2 0.23 0.52 8.1 89.5％ 93.2％ Comparative Example 4 2.3 2 0.24 0.56 8.5 87.9％ 95.8％ Comparative Example 5 3.6 0 0.45 0.85 12.3 81.5％ 99.6％ Comparative Example 6 3.8 0 0.47 0.86 11.6 80.5％ 99.8％ Comparative Example 7 3.7 0 0.48 0.88 11.0 78.9％ 99.5％ Comparative Example 8 2.4 2 0.33 0.69 10.9 70.2％ 96.7％ Comparative Example 9 2.6 2 0.35 0.70 11.2 70.6％ 97.8％

[0259] Where: σ is in N / mm 2 MP is measured in kN / m.

[0260] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the concept of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A polyethylene nonwoven paper, characterized by, Its raw materials include polyethylene; its basis weight is 45–95 g / cm³. 2 ; The standard cold shrinkage strength σ of the polyethylene nonwoven paper is 1.5-4.5 N / mm 2 ; The mildew resistance rating of polyethylene nonwoven paper is less than or equal to level 1; in: Standard cold shrink strength is σ = [F / S] * [actual gsm / 50 g / m 2 ]; S is the initial cross-sectional area of ​​the sample; F represents the cold contraction force; Polyethylene nonwoven paper is prepared by the following method: The spinning raw material is dissolved in a spinning solvent to obtain a spinning solution. The spinning solution is then flash-spun at 170-240°C. The flash-spun fibers are laid into a web. Finally, the paper is obtained by hot pressing and calendering with hot rollers. The spinning raw material is polyethylene and anti-mildew additives. The anti-mildew additives are composite single-walled carbon nanofibers. The processing method of the anti-mildew additive includes the following technical steps: dispersing single-walled carbon nanotubes in an alkaline solution, then adding them to a mixed solution of copper sulfate and zinc sulfate, filtering to obtain a mixture, then grinding and calcining a second time to obtain another mixture; adding the mixture to a boric acid solution, filtering to separate it, and then calcining it a third time to obtain the anti-mildew additive.

2. A polyethylene nonwoven paper according to claim 1, wherein The standard cold shrinkage strength σ of the polyethylene nonwoven paper is 1.5-2.5 N / mm 2 .

3. A polyethylene nonwoven paper according to claim 1, wherein The standard cold shrink strength σ of the polyethylene nonwoven paper is 2.5-4.5 N / mm 2 .

4. The polyethylene nonwoven paper as described in claim 1, characterized in that, The transverse shrinkage rate (CR) of polyethylene nonwoven paper is 0.25–0.

45. The longitudinal shrinkage rate (MR) of polyethylene nonwoven paper is 0.60–0.

85. And MR / CR is greater than 1; in: Longitudinal shrinkage rate MR = [(ML0-ML1) / ML0]; Lateral shrinkage rate CR = [(CL0-CL1) / CL0]; ML0 is the initial length of the longitudinal sample; ML1 is the length of the longitudinal sample after shrinkage; CL0 is the initial length of the transverse sample; CL1 is the length of the transverse sample after shrinkage.

5. A polyethylene nonwoven paper according to claim 4, wherein The transverse shrinkage rate (CR) of polyethylene nonwoven paper is 0.25–0.

35.

6. A polyethylene nonwoven paper according to claim 4, wherein The transverse shrinkage rate (CR) of polyethylene nonwoven paper is 0.35–0.

45.

7. A polyethylene nonwoven paper according to claim 4, wherein The longitudinal shrinkage rate (MR) of polyethylene nonwoven paper is 0.6–0.

75.

8. A polyethylene nonwoven paper according to claim 4, wherein The longitudinal shrinkage rate (MR) of polyethylene nonwoven paper is 0.75–0.

85.

9. A polyethylene nonwoven paper according to claim 4, wherein The MR / CR of polyethylene nonwoven paper is greater than 1.

2.

10. A polyethylene nonwoven paper according to claim 4, wherein The MR / CR of polyethylene nonwoven paper is greater than 2.

11. A polyethylene nonwoven paper as described in claim 1, characterized in that, The standard longitudinal tear strength (MP) of polyethylene nonwoven paper is 9–12.5 kN / m. in: MP = [MF / d] * [actual gsm / 50 g / m 2 ]; MF represents the tearing force of the longitudinal sample; d represents the thickness of the longitudinal sample.

12. A polyethylene nonwoven paper according to claim 11, wherein The standard longitudinal tear strength (MP) of polyethylene nonwoven paper is 9–10.5 kN / m.

13. A polyethylene nonwoven paper according to claim 12, wherein The standard longitudinal tear strength (MP) of polyethylene nonwoven paper is 11–12.5 kN / m.

14. A process for the preparation of a polyethylene nonwoven paper according to any one of claims 1 to 13, characterized in that The technical steps involved are as follows: dissolving the spinning raw material in a spinning solvent to obtain a spinning solution, then flash spinning the spinning solution at 170-240°C, laying the flash-spun fibers into a web, and finally obtaining polyethylene nonwoven paper by hot pressing and calendering processes using hot rollers; the spinning raw material is polyethylene and anti-mildew additives; the anti-mildew additives are composite single-walled carbon nanofibers.