A manufacturing process for high water pressure resistant polyethylene nonwoven fabric

Abstract

This application provides a manufacturing process for a high water-pressure resistant polyethylene nonwoven fabric, relating to the field of textile fabric technology. This application utilizes waste high-density polyethylene plastic blended with carboxymethyl cellulose derivatives to produce polyethylene paper via flash evaporation. This polyethylene paper exhibits excellent waterproof and breathable properties. Then, a PUR moisture-curing hot melt adhesive is used to composite woven synthetic fiber fabric with the polyethylene paper and nylon warp-knitted fabric to prepare a high water-pressure resistant fabric. This fabric not only possesses good waterproof and breathable properties but also exhibits excellent washability and comfortable wear.

Description

Technical Field

[0001] This application relates to the field of textile fabric technology, and in particular to a manufacturing process for a polyethylene nonwoven fabric with high water pressure resistance. Background Technology

[0002] Plastics, as a widely used chemical product, bring convenience to people's daily lives, but due to their inherent weakness of being difficult to degrade, they generate a large amount of solid waste, posing a significant challenge to the Earth's environment and environmental protection. The treatment and reuse of waste plastics has become an important issue in environmental pollution control.

[0003] Polyethylene (PE) is a commonly used plastic. Unlike biodegradable plastics, PE waste cannot be treated through composting or natural degradation. Instead, it is mainly recycled, separated, washed, dehydrated, and then re-extruded and granulated into secondary material chips for reuse in secondary product lines. In recent years, there has been considerable research on the recycling of PE waste, primarily focusing on three aspects: direct recycling, modified recycling, and pyrolysis recycling of waste PE. Examples include the production of PE / bamboo powder composite materials, the catalytic pyrolysis of waste PE to produce fuel oil, and research on direct film production processes for the recycling of waste PE plastic films. However, these methods still suffer from drawbacks such as cumbersome recycling processes and low added value.

[0004] For example, patent CN105504339A discloses a recycling process for polyethylene plastic. The process involves granulating waste polyethylene plastic, then cleaning the granules to remove impurities. After drying, the granules are added to an ethyl acetate solution and heated to dissolve. After complete melting, ethanol is added, causing the mixture to separate into layers. The upper layer is a mixture of ethanol and ethyl acetate, and the lower layer is polystyrene. The lower layer of polystyrene is separated and placed in a drying tower. First, steam is passed through to wash away the ethanol and ethyl acetate adhering to the polystyrene, and then hot air is passed through to dry the polystyrene.

[0005] For example, patent CN103172919A discloses a method for recycling waste cross-linked polyethylene foam. The method includes the following steps: classifying, grinding, and screening the waste cross-linked polyethylene foam to obtain ground material; then adding the ground material to polyethylene and ethylene-vinyl acetate instead of certain new raw materials, and adding main antioxidant, foaming agent, auxiliary antioxidant and other additives for mixing and granulation to prepare masterbatch; then mixing the prepared masterbatch with sensitizer and extruding it into continuous masterbatch using an extrusion calender; then continuously irradiating the obtained masterbatch; finally, placing the irradiated masterbatch into a foaming furnace to foam and prepare foamed material that meets the requirements; and returning the foamed material that does not meet the requirements to step (1) for recycling again.

[0006] For example, patent CN104629152A discloses a method for recycling waste high-density polyethylene plastic to prepare 3D printing materials. The method involves crushing and cleaning the waste high-density polyethylene plastic, pretreating hemp fibers, adding additives and performing low-temperature pulverization, extrusion granulation, and recycling for use in 3D printing.

[0007] Polyethylene is a commonly used raw material for producing nonwoven fabrics, and its main molding processes include meltblowing, bonding, water / needle punching, and flash spinning. In recent years, innovative methods have been proposed to use air amplifiers to replace traditional electrostatic fiber opening equipment, improving fiber opening efficiency and fiber orientation, and greatly promoting the development of flash spinning nonwoven fabric preparation technology in China. Therefore, directly using waste polyethylene as raw material to prepare products through flash spinning not only achieves the recycling of waste polyethylene but also simplifies the process and increases added value. Summary of the Invention

[0008] The purpose of this application is to address the shortcomings of existing technologies by providing a manufacturing process for a high water-pressure resistant polyethylene nonwoven fabric. This application involves recycling waste high-density polyethylene plastic, blending it with carboxymethyl cellulose derivatives, and then flash-evaporating it to produce polyethylene paper. Finally, woven synthetic fiber fabric is combined with the polyethylene paper and nylon warp-knitted fabric to obtain the high water-pressure resistant fabric. The resulting fabric not only possesses excellent waterproof properties and excellent moisture permeability due to its microporous structure, but also exhibits superior washability and comfortable wear.

[0009] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0010] This application first provides a method for preparing polyethylene paper using waste high-density polyethylene plastic, including the following steps:

[0011] Waste high-density polyethylene plastic is cleaned and crushed, then soaked in a soaking solution, washed and dried, and then dissolved with carboxymethyl cellulose derivatives in a solvent to prepare a spinning solution. Finally, polyethylene paper is produced by flash evaporation.

[0012] Furthermore, the carboxymethyl cellulose derivative is prepared by modifying sodium carboxymethyl cellulose with monomethyl succinate chloride and cocoyl chloride.

[0013] Preferably, the amount of carboxymethyl derivative used is greater than or equal to 4% and less than or equal to 8% of the mass of waste high-density polyethylene plastic.

[0014] Preferably, the amount of succinic acid monomethyl ester chloride is greater than or equal to 2 times and less than or equal to 5 times the mass of sodium carboxymethyl cellulose.

[0015] Preferably, the amount of cocoyl chloride used is greater than or equal to 0.5 times and less than or equal to 1 times the mass of sodium carboxymethyl cellulose.

[0016] Preferably, the carboxymethyl cellulose derivative is prepared by the following method:

[0017] Sodium carboxymethyl cellulose was added to n-heptane, along with succinic acid monomethyl ester chloride and cocoyl chloride. The reaction was carried out at a temperature greater than or equal to 50°C and less than or equal to 65°C for a reaction time greater than or equal to 3 hours and less than or equal to 5 hours. After the reaction was completed, the mixture was filtered, washed with n-heptane, and dried to obtain the carboxymethyl cellulose derivative.

[0018] Carboxymethyl cellulose (CMC) is a natural polymer derivative with an ether-like structure. Its molecular chain contains numerous carboxyl and hydroxyl groups, exhibiting certain reactivity. This application modifies CMC using monomethyl succinate chloride and cocoyl chloride. The acyl chloride groups react with the hydroxyl groups on CMC, thus grafting them onto the CMC. This introduces hydrophobic ester groups and aliphatic chains into the modified CMC, thereby improving its hydrophobicity. Using CMC derivatives with waste high-density polyethylene to produce polyethylene paper helps reduce the surface microporous structure of the polyethylene paper, improving its waterproof ability without reducing its moisture permeability. Furthermore, it helps improve wash resistance, allowing the fabric to maintain its original structure after multiple washes with minimal changes in waterproofness and moisture permeability.

[0019] Furthermore, the soaking solution uses water as a solvent and contains surfactants, salt, and malic acid.

[0020] Preferably, the soaking solution contains, by mass percentage, 6% and 10% surfactant, 0.5% and 1% salt, 1% and 3% malic acid, with the remainder being water.

[0021] Preferably, the surfactant is selected from at least one of dodecyl sulfobetaine, dodecyl ethoxy sulfobetaine, dodecyl hydroxypropyl sulfobetaine, dodecyl sulfopropyl betaine, tetradecanoamide propyl hydroxypropyl sulfobetaine, decyl hydroxypropyl sulfobetaine, tetradecyl dihydroxyethylamine oxide, and cocamidopropylamine oxide.

[0022] Furthermore, the amount of soaking solution used is greater than or equal to 8 times and less than or equal to 15 times the mass of the waste high-density polyethylene plastic.

[0023] Furthermore, the soaking temperature during the soaking process is greater than or equal to 50℃ and less than or equal to 60℃, and the soaking time is greater than or equal to 1 hour and less than or equal to 3 hours.

[0024] Furthermore, the solvent is selected from at least one of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, nitriles, amides, and fluorocarbons.

[0025] Furthermore, the amount of solvent used is greater than or equal to four times and less than or equal to five times the mass of the waste high-density polyethylene plastic.

[0026] Furthermore, the temperature during the flash evaporation process is greater than or equal to 180℃ and less than or equal to 220℃.

[0027] Furthermore, during the flash evaporation process, the spinning solution is initially depressurized, resulting in slight phase separation. It is then pumped to the spinneret, where it is further depressurized and undergoes further phase separation as it exits the spinneret. As the spinning solution exits, the solvent in the spinning solution rapidly and instantaneously evaporates, and the polymer in the spinning solution quickly cools and solidifies, forming fiber bundles. High-pressure air carrying the fiber bundles is directed to the air amplifier by a deflector plate. Inside the air amplifier, the high-pressure air performs a secondary stretching of the fiber bundles and uniformly opens them into a loose, net-like structure. The opened fiber bundles settle onto the accumulation belt to form a fiber web, which is then preliminarily heat-rolled by rollers to form a nonwoven fabric.

[0028] This application also provides a polyethylene paper prepared by the above method.

[0029] This application also provides the application of polyethylene paper in the preparation of high water pressure resistant fabrics.

[0030] This application also provides a high water pressure resistant fabric, including a top layer, a middle layer and a bottom layer. The bottom layer is made of 20D nylon warp-knitted fabric, the middle layer is made of polyethylene paper, and the top layer is made of 75D high-density high-F-number polyester DTY woven fabric. The top layer and the middle layer, as well as the middle layer and the bottom layer, are bonded together with PUR moisture-curing hot melt adhesive. The top layer fabric is also treated with a water-repellent finish.

[0031] Furthermore, the weight of the surface layer 75D high-density high-F-count polyester DTY fabric is greater than or equal to 90 g / m². 2 And less than or equal to 150g / m 2 The basis weight of polyethylene paper is greater than or equal to 50 g / m². 2 And less than or equal to 60g / m 2 The weight of the bottom fabric is greater than or equal to 25g / m². 2 And less than or equal to 40g / m 2 .

[0032] Furthermore, the water-repellent finishing process employs a two-immersion, two-rolling method, with a pressure greater than or equal to 3 kg / cm². 2 And less than or equal to 4 kg / cm 2 The rolling residue is greater than or equal to 70%. First, it is pre-dried at a temperature greater than or equal to 100℃ and less than or equal to 110℃ for a pre-drying time of greater than or equal to 1 min and less than or equal to 5 min. Then, it is baked at a temperature greater than or equal to 160℃ and less than or equal to 175℃ for a baking time of greater than or equal to 3 min and less than or equal to 5 min.

[0033] Furthermore, the water-repellent finishing agent comprises: 50g / L of fluorine-free water-repellent agent, 1g / L of penetrant, 5g / L of antistatic agent, and the remainder is water.

[0034] The present invention selects fluorine-free waterproofing agents such as RUCO-DRY ECO, J-XR88, or... R-ACE features safety, sustainability, and environmental friendliness. The penetrant is at least one of AEP, OEP-70, JFC-1, JFC-2, JFC-E, JFC-M, OP-4, polyoxyethylene alkylamine, or sorbitan ester. The penetrant allows the water-repellent finishing agent to better penetrate the fabric, thereby improving its performance.

[0035] Furthermore, the surface fabric after water-repellent finishing undergoes calendering at a temperature of 140℃, a speed of 30m / min, and a pressure of 75kg / cm² on a two-roll calender. 2 Two pressure calendering processes are applied to further enhance the waterproof and pressure-resistant properties of the surface fabric.

[0036] Furthermore, the dosage of PUR moisture-curing hot melt adhesive is greater than or equal to 6 g / m³. 2 And less than or equal to 8g / m 2 .

[0037] Furthermore, the temperature during the bonding and curing process is greater than or equal to 75°C and less than or equal to 95°C.

[0038] Furthermore, the PUR moisture-curing hot melt adhesive is prepared by the following method:

[0039] Dehydrated polyester polyol and diisocyanate are mixed, and antioxidants and catalysts are added for reaction. The reaction temperature is greater than or equal to 85℃ and less than or equal to 90℃, and the reaction time is greater than or equal to 50 min and less than or equal to 70 min to obtain a prepolymer. Then, chain extender, N-phenylethanolamine and butanetetracarboxylic acid are added, and the reaction is carried out at a temperature greater than or equal to 75℃ and less than or equal to 85℃ for a reaction time greater than or equal to 30 min and less than or equal to 50 min. Finally, curing agent is added, and the mixture is stirred at a temperature greater than or equal to 50℃ and less than or equal to 55℃ for a time greater than or equal to 10 min and less than or equal to 20 min to obtain PUR moisture-curing hot melt adhesive.

[0040] Preferably, in the preparation of PUR moisture-curing hot melt adhesive, the amount of polyester polyol is greater than or equal to 80 parts and less than or equal to 100 parts, the amount of diisocyanate is greater than or equal to 50 parts and less than or equal to 70 parts, the amount of antioxidant is greater than or equal to 2 parts and less than or equal to 3 parts, the amount of catalyst is greater than or equal to 0.5 parts and less than or equal to 1 part, the amount of chain extender is greater than or equal to 1 part and less than or equal to 3 parts, the amount of N-phenylethanolamine is greater than or equal to 0.5 parts and less than or equal to 0.8 parts, the amount of butanetetracarboxylic acid is greater than or equal to 0.2 parts and less than or equal to 0.3 parts, and the amount of curing agent is greater than or equal to 10 parts and less than or equal to 15 parts.

[0041] Preferably, the polyester polyol is selected from at least one of phthalic anhydride polyester polyol, sebacic acid polyester polyol, and adipic acid polyester polyol, and the molecular weight of the polyester polyol is greater than or equal to 2000 and less than or equal to 3000.

[0042] Preferably, the diisocyanate is selected from at least one of tetramethylene-1,4-diisocyanate, pentamethylene-1,5-diisocyanate (PDI), hexamethylene-1,6-diisocyanate (HDI), isophorone diisocyanate (IPDI), toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and isophthalic diisocyanate (XDI).

[0043] Preferably, the antioxidant is selected from at least one of tris(dipolypropylene glycol) phosphite, tri-(2,4-di-tert-butylphenyl) phosphite, di(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, di(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, triphenyl phosphite, diphenylalkyl phosphite, diphenylisodecyl phosphite, phenyl diisodecyl phosphite, and 2,6-tert-butyl-4-methylphenol.

[0044] Preferably, the catalyst is stannous octoate.

[0045] Preferably, the chain extender is selected from at least one of 1,4-butanediol, trimethylolpropane, and diethylene glycol.

[0046] Preferably, the curing agent is selected from at least one of incozol LV, incozol EH and incozol 4.

[0047] Compared with the prior art, this application has the following beneficial effects:

[0048] 1. This application directly recycles waste polyethylene plastic to produce polyethylene paper. The process is simple. The obtained polyethylene paper is then combined with polyethylene nonwoven fabric to produce a high water pressure resistant fabric. The resulting fabric has good waterproof and breathable properties and excellent water resistance.

[0049] 2. The present application uses soaking solution to treat polyethylene plastic during recycling, which helps to improve the uniformity of polyethylene paper, thereby improving the waterproof and breathable properties of the finished fabric.

[0050] 3. This application adds a certain amount of carboxymethyl cellulose derivative during the production of polyethylene paper, which helps to improve the waterproofness of polyethylene paper and finished fabric without affecting breathability, and also helps to improve the washability of the fabric.

[0051] 4. The addition of a certain amount of N-phenylethanolamine during the preparation of the PUR moisture-curing hot melt adhesive in this application helps to improve the bonding performance and water resistance of the hot melt adhesive, so that the fabric can still show high tear resistance after multiple washes.

[0052] 5. The high water pressure resistant fabric in this application uses polyethylene nonwoven fabric, i.e. polyethylene paper, instead of the traditional coating method. The processing is environmentally friendly and controllable, which is in line with the current environmental protection concept. There is no concern about solvent residue in the finished fabric. Polyethylene nonwoven fabric also has microporous breathability and microclimate regulation ability. When the human body exercises a lot, it can better expel the sweat produced by the human body. At the same time, polyethylene nonwoven fabric also has a certain hydrostatic pressure protection ability, achieving better moisture permeability and waterproof effect. Attached Figure Description

[0053] Figure 1 The image shows the infrared spectrum of the carboxymethyl cellulose derivative in Example 1; (a) sodium carboxymethyl cellulose and (b) the carboxymethyl cellulose derivative. Detailed Implementation

[0054] The following non-limiting embodiments are intended to enable those skilled in the art to gain a more comprehensive understanding of this application, but do not limit this application in any way. The following content is merely an exemplary description of the scope of protection claimed in this application, and those skilled in the art can make various changes and modifications to the invention based on the disclosed content, which should also fall within the scope of protection claimed in this application.

[0055] The present application will be further described below by way of specific embodiments. Unless otherwise specified, all chemical reagents used in the embodiments of this application are obtained through conventional commercial means.

[0056] Example 1: Preparation of Polyethylene Paper No. 1

[0057] A method for preparing polyethylene paper using waste high-density polyethylene plastic includes the following steps:

[0058] Waste high-density polyethylene plastic is cleaned and crushed, then soaked in a soaking solution, washed with water and dried. It is then dissolved with carboxymethyl cellulose derivative in N,N-dimethylformamide, with the amount of solvent being 4 times the mass of the waste high-density polyethylene plastic, to obtain a spinning solution. Finally, polyethylene paper is produced by flash evaporation.

[0059] Specifically, the soaking solution contains, by mass percentage, 6% surfactant, 1% salt, 3% malic acid, and the remainder is water.

[0060] Specifically, the mass ratio of waste high-density polyethylene plastic to soaking solution is 1:8.

[0061] Specifically, the soaking temperature is 50℃ and the soaking time is 3 hours.

[0062] Specifically, the amount of carboxymethyl cellulose derivative used is 4% of the mass of waste high-density polyethylene plastic.

[0063] Specifically, the carboxymethyl cellulose derivative is prepared by the following method:

[0064] The sodium carboxymethyl cellulose, monomethyl succinate chloride, and cocoyl chloride were weighed according to a mass ratio of 1:2:0.5. The sodium carboxymethyl cellulose was then added to n-heptane, followed by the monomethyl succinate chloride and cocoyl chloride. The mixture was reacted at 50°C for 5 hours. After the reaction was complete, the mixture was filtered, washed with n-heptane, and dried to obtain the carboxymethyl cellulose derivative. Infrared spectroscopy was performed on the obtained carboxymethyl cellulose derivative, with a scanning range of 4000-500 cm⁻¹. -1 The result is as follows Figure 1 As shown in the figure. Compared to the unmodified sodium carboxymethyl cellulose, i.e., shown in figure (a), figure (b), i.e., the carboxymethyl cellulose derivative, shows a lower content of 1733 cm⁻¹. -1 The appearance of new characteristic peaks nearby is attributed to the absorption vibration of the ester group. This is generated by the reaction of monomethyl succinate chloride, cocoyl chloride and the hydroxyl group in carboxymethyl cellulose, as well as the ester group introduced in monomethyl succinate chloride. This indicates that monomethyl succinate chloride and cocoyl chloride were successfully grafted onto carboxymethyl cellulose.

[0065] Example 2: Preparation of Polyethylene Paper #2

[0066] Another method for preparing polyethylene paper using waste high-density polyethylene plastic includes the following steps:

[0067] Waste high-density polyethylene plastic is cleaned and crushed, then soaked in a soaking solution, washed with water and dried. It is then dissolved with carboxymethyl cellulose derivative in N,N-dimethylformamide, with the amount of solvent being 5 times the mass of the waste high-density polyethylene plastic, to obtain a spinning solution. Finally, polyethylene paper is obtained by flash evaporation.

[0068] Specifically, the soaking solution, by mass percentage, contains 10% surfactant, 0.5% salt, 1% malic acid, and the remainder is water.

[0069] Specifically, the mass ratio of waste high-density polyethylene plastic to soaking solution is 1:15.

[0070] Specifically, the soaking temperature is 60℃ and the soaking time is 1 hour.

[0071] Specifically, the amount of carboxymethyl cellulose derivative used is 8% of the mass of waste high-density polyethylene plastic.

[0072] Specifically, the carboxymethyl cellulose derivative is prepared by the following method:

[0073] Weigh the sodium carboxymethyl cellulose, monomethyl succinate chloride, and cocoyl chloride in a mass ratio of 1:5:1. Then, add the sodium carboxymethyl cellulose to n-heptane, followed by the monomethyl succinate chloride and cocoyl chloride. React at 65°C for 3 hours. After the reaction is complete, filter, wash with n-heptane, and dry to obtain the carboxymethyl cellulose derivative.

[0074] Example 3: Preparation of Polyethylene Paper #3

[0075] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that the soaking solution contains 10% surfactant, 0.5% salt, and the remainder is water. Everything else is the same as in Example 2.

[0076] Example 4: Preparation of Polyethylene Paper #4

[0077] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that the soaking solution contains 10% surfactant, 1% malic acid, and the remainder is water. Everything else is the same as in Example 2.

[0078] Example 5: Preparation of Polyethylene Paper #5

[0079] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that the soaking solution contains only 10% surfactant. The rest is the same as in Example 2.

[0080] Example 6: Preparation of Polyethylene Paper #6

[0081] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that the carboxymethyl cellulose derivative is prepared by the following method:

[0082] Weigh sodium carboxymethyl cellulose and cocoyl chloride at a mass ratio of 1:6, then add sodium carboxymethyl cellulose to n-heptane, add cocoyl chloride, react at 65°C for 3 hours, filter after reaction, wash with n-heptane, and dry to obtain carboxymethyl cellulose derivative.

[0083] Everything else is the same as in Example 2.

[0084] Example 7: Preparation of Polyethylene Paper #7

[0085] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that the carboxymethyl cellulose derivative is prepared by the following method:

[0086] The sodium carboxymethyl cellulose and monomethyl succinate chloride were weighed according to a mass ratio of 1:6. Then, the sodium carboxymethyl cellulose was added to n-heptane, followed by the addition of monomethyl succinate chloride. The mixture was reacted at 65°C for 3 hours. After the reaction was complete, the mixture was filtered, washed with n-heptane, and dried to obtain the carboxymethyl cellulose derivative.

[0087] Everything else is the same as in Example 2.

[0088] Example 8: Preparation of Polyethylene Paper #8

[0089] Another method for preparing polyethylene paper from waste high-density polyethylene plastic differs from Example 2 in that an equal amount of carboxymethyl cellulose is used instead of a carboxymethyl cellulose derivative. Everything else is the same as in Example 2.

[0090] Example 9: Preparation of Polyethylene Paper #9

[0091] Another method for preparing polyethylene paper using waste high-density polyethylene plastic differs from Example 2 in that no carboxymethyl cellulose derivative is added; otherwise, it is the same as Example 2.

[0092] Examples 10-18: High water pressure resistant fabric

[0093] A high water pressure resistant fabric includes an outer layer, a middle layer, and an inner layer. The inner layer is made of 20D nylon warp-knitted fabric, the middle layer is made of polyethylene paper, and the outer layer is made of 75D high-density high-F-number polyester DTY as warp and weft yarns. The outer layer and the middle layer, as well as the middle layer and the inner layer, are bonded together with PUR moisture-curing hot melt adhesive. The outer layer fabric is also treated with water-repellent finishing and calendering.

[0094] Specifically, the weight of the outer fabric is 90 g / m². 2 The basis weight of the polyethylene paper is 50 g / m². 2 The weight of the bottom knitted fabric is 30g / m². 2 .

[0095] Specifically, the water-repellent finishing process employs a two-immersion, two-rolling method, with a pressure of 3 kg / cm². 2 The rolling residue is 70%. It is first pre-dried at 100℃ for 5 minutes, and then baked at 160℃ for 5 minutes.

[0096] Specifically, the water-repellent finishing agent includes: fluorine-free waterproofing agent J-XR8850g / L, penetrant JFC-11g / L, antistatic agent 5g / L, and the remainder is water.

[0097] Specifically, the calendering temperature for the finishing process is 140℃, the machine speed is 30m / min, and the pressure of the twin-roll calender is 75kg / cm. 2 Two pressure calendering processes are applied to further enhance the waterproof and pressure-resistant properties of the surface fabric.

[0098] Specifically, the dosage of PUR moisture-curing hot melt adhesive is 8g / m³. 2 The bonding and curing temperature is 75℃.

[0099] Specifically, the PUR moisture-curing hot melt adhesive is prepared by the following method:

[0100] 100 parts of dehydrated adipic acid polyester polyol and 70 parts of hexamethylene-1,6-diisocyanate were mixed, and 3 parts of diphenylalkyl phosphite and 1 part of stannous octoate were added. The mixture was reacted at 90°C for 50 min to obtain a prepolymer. Then, 3 parts of 1,4-butanediol, 0.8 parts of N-phenylethanolamine and 0.3 parts of butanetetracarboxylic acid were added, and the mixture was reacted at 85°C for 30 min. Finally, 15 parts of incozol LV curing agent were added, and the mixture was stirred at 55°C for 10 min to obtain PUR moisture-curing hot melt adhesive.

[0101] Example 19: High water pressure resistant fabric

[0102] Another type of high water pressure resistant fabric includes an outer layer, a middle layer, and an inner layer. The inner layer is made of 20D nylon warp-knitted fabric, the middle layer is made of polyethylene paper No. 2, and the outer layer is made of 75D high-density high-F-number polyester DTY as warp and weft yarns. The outer layer and the middle layer, as well as the middle layer and the inner layer, are bonded together with PUR moisture-curing hot melt adhesive. The outer layer fabric is also treated with water-repellent finishing and calendering.

[0103] Specifically, the weight of the outer fabric is 90 g / m². 2 The basis weight of the polyethylene paper is 50 g / m². 2 The weight of the base fabric is 30g / m². 2 .

[0104] Specifically, the water-repellent finishing process employs a two-immersion, two-rolling method, with a pressure of 3 kg / cm². 2 The rolling residue is 70%. It is first pre-dried at 100℃ for 5 minutes, and then baked at 160℃ for 5 minutes.

[0105] Specifically, the water-repellent finishing agent includes: fluorine-free waterproofing agent J-XR8850g / L, penetrant JFC-11g / L, antistatic agent 5g / L, and the remainder is water.

[0106] Specifically, the calendering temperature for the finishing process is 140℃, the machine speed is 30m / min, and the pressure of the twin-roll calender is 75kg / cm. 2 Two pressure calendering processes are applied to further enhance the waterproof and pressure-resistant properties of the surface fabric.

[0107] Specifically, the dosage of PUR moisture-curing hot melt adhesive is 8g / m³. 2 The bonding and curing temperature is 75℃.

[0108] Specifically, the PUR moisture-curing hot melt adhesive is prepared by the following method:

[0109] 100 parts of dehydrated adipic acid polyester polyol and 70 parts of hexamethylene-1,6-diisocyanate were mixed, and 3 parts of diphenylalkyl phosphite and 1 part of stannous octoate were added. The mixture was reacted at 90°C for 50 min to obtain a prepolymer. Then, 3 parts of 1,4-butanediol and 0.8 parts of N-phenylethanolamine were added, and the mixture was reacted at 85°C for 30 min. Finally, 15 parts of incozol LV curing agent were added, and the mixture was stirred at 55°C for 10 min to obtain PUR moisture-curing hot melt adhesive.

[0110] Example 20: High water pressure resistant fabric

[0111] Another type of high water pressure resistant fabric includes an outer layer, a middle layer, and an inner layer. The inner layer is made of 20D nylon warp-knitted fabric, the middle layer is made of polyethylene paper #2, and the outer layer is made of 75D high-density high-F-number polyester DTY as warp and weft yarns. The outer layer and the middle layer, as well as the middle layer and the inner layer, are bonded together with PUR moisture-curing hot melt adhesive. The outer layer fabric is also treated with a water-repellent finish.

[0112] Specifically, the weight of the outer fabric is 90 g / m². 2 The basis weight of the polyethylene paper is 50 g / m². 2 The weight of the base fabric is 30g / m². 2 .

[0113] Specifically, the water-repellent finishing process employs a two-immersion, two-rolling method, with a pressure of 3 kg / cm². 2 The rolling residue is 70%. It is first pre-dried at 100℃ for 5 minutes, and then baked at 160℃ for 5 minutes.

[0114] Specifically, the water-repellent finishing agent includes: fluorine-free waterproofing agent J-XR8850g / L, penetrant JFC-11g / L, antistatic agent 5g / L, and the remainder is water.

[0115] Specifically, the dosage of PUR moisture-curing hot melt adhesive is 8g / m³. 2 The bonding and curing temperature is 75℃.

[0116] Specifically, the PUR moisture-curing hot melt adhesive is prepared by the following method:

[0117] 100 parts of dehydrated adipic acid polyester polyol and 70 parts of hexamethylene-1,6-diisocyanate were mixed, and 3 parts of diphenylalkyl phosphite and 1 part of stannous octoate were added. The mixture was reacted at 90°C for 50 min to obtain a prepolymer. Then, 3 parts of 1,4-butanediol and 0.3 parts of butanetetracarboxylic acid were added, and the mixture was reacted at 85°C for 30 min. Finally, 15 parts of incozol LV curing agent were added, and the mixture was stirred at 55°C for 10 min to obtain PUR moisture-curing hot melt adhesive.

[0118] Example 21: High water pressure resistant fabric

[0119] Another type of high water pressure resistant fabric includes an outer layer, a middle layer, and an inner layer. The inner layer is made of 20D nylon warp-knitted fabric, the middle layer is made of polyethylene paper #2, and the outer layer is made of 75D high-density high-F-number polyester DTY as warp and weft yarns. The outer layer and the middle layer, as well as the middle layer and the inner layer, are bonded together with PUR moisture-curing hot melt adhesive. The outer layer fabric is also treated with a water-repellent finish.

[0120] Specifically, the weight of the outer fabric is 180g / m². 2 The basis weight of the polyethylene paper is 50 g / m². 2 The weight of the base fabric is 50g / m². 2 .

[0121] Specifically, the water-repellent finishing process employs a two-immersion, two-rolling method, with a pressure of 3 kg / cm². 2 The rolling residue is 70%. It is first pre-dried at 100℃ for 5 minutes, and then baked at 160℃ for 5 minutes.

[0122] Specifically, the water-repellent finishing agent includes: fluorine-free waterproofing agent J-XR8850g / L, penetrant JFC-11g / L, antistatic agent 5g / L, and the remainder is water.

[0123] Specifically, the calendering temperature for the finishing process is 140℃, the machine speed is 30m / min, and the pressure of the twin-roll calender is 75kg / cm. 2 Two pressure calendering processes are applied to further enhance the waterproof and pressure-resistant properties of the surface fabric.

[0124] Specifically, the dosage of PUR moisture-curing hot melt adhesive is 8g / m³. 2 The bonding and curing temperature is 75℃.

[0125] Specifically, the PUR moisture-curing hot melt adhesive is prepared by the following method:

[0126] 100 parts of dehydrated adipic acid polyester polyol and 70 parts of hexamethylene-1,6-diisocyanate were mixed, and 3 parts of diphenylalkyl phosphite and 1 part of stannous octoate were added. The mixture was reacted at 90°C for 50 min to obtain a prepolymer. Then, 3 parts of 1,4-butanediol were added and the mixture was reacted at 85°C for 30 min. Finally, 15 parts of incozol LV curing agent were added and the mixture was stirred at 55°C for 10 min to obtain PUR moisture-curing hot melt adhesive.

[0127] Experimental Example 1

[0128] The high water pressure resistance and moisture permeability of the high water pressure resistant fabrics obtained in Examples 10-18 were tested. The high water pressure resistance was tested according to the standard ISO 811-2018 Determination of Water Permeability of Textiles (Hydrostatic Pressure Test), and the moisture permeability was tested according to the standard ASTM E96BW-1995 Inverted Cup Method. The measured hydrostatic pressure and moisture permeability results of the high water pressure resistant fabrics are shown in Table 1 below.

[0129] Table 1

[0130]

[0131]

[0132] As shown in Table 1, the fabrics obtained in Examples 10 and 11 have a hydrostatic pressure of over 12000 mmH2O and a moisture permeability of 7000 g / m². 2 As can be seen from the above, the polyethylene nonwoven fabric with high water pressure resistance obtained in this application has both high water pressure resistance and good moisture permeability, that is, good waterproof and moisture permeability.

[0133] In Examples 12-14, the soaking solutions used in the polyethylene paper preparation process were different. The hydrostatic pressure and moisture permeability of the fabrics obtained in Examples 12-14 were lower than those in Examples 10 and 11, i.e., the waterproof and moisture permeability decreased. This may be because the waste high-density polyethylene plastic was treated with a specific soaking solution in this application, which not only helps to remove impurities from the waste plastic more thoroughly, but also allows the soaking solution to enter the high molecular weight of polyethylene, which helps to interweave with carboxymethyl cellulose derivatives in the later stage, thereby making the polyethylene resin obtain a more uniform structure, which helps to improve the uniformity of polyethylene paper and improve waterproof and moisture permeability.

[0134] In Examples 15-18, the carboxymethyl cellulose derivatives used in the polyethylene paper preparation process differed. Example 17 used unmodified carboxymethyl cellulose, while Examples 15 and 16 used different modifiers in the carboxymethyl cellulose modification process. The moisture permeability and hydrostatic pressure of the fabrics obtained in Examples 15-17 were lower than those in Examples 10 and 11, indicating that the addition of carboxymethyl cellulose reduces the fabric's waterproof and breathable properties. Adding the carboxymethyl cellulose derivative provided in this application is necessary to improve the fabric's waterproof and breathable properties. In Example 18, no carboxymethyl cellulose derivative was added, and the resulting fabric had a significantly lower hydrostatic pressure than that of Example 11, while the moisture permeability was only slightly different from that of Examples 10 and 11. This demonstrates that adding the carboxymethyl cellulose derivative to waste high-density polyethylene plastic not only improves the performance of polyethylene, thereby enhancing the fabric's waterproofness, but also does not lead to a decrease in moisture permeability.

[0135] Experimental Example 2

[0136] The water resistance of the high water pressure resistant fabrics obtained in Examples 10-18 was tested. The water resistance was tested according to the washing procedure 4N of GB / T8629-2017, and the drying procedure was hanging to dry. The results are shown in Table 2.

[0137] Table 2

[0138]

[0139] As shown in Table 2, the fabrics obtained in Examples 10 and 11 still have a hydrostatic pressure of over 10,000 mmH2O after 10 washes, and the moisture permeability increases slightly. This indicates that the high water pressure resistant fabric prepared in this application has good water washability and maintains good waterproof and moisture permeability after multiple washes.

[0140] In Examples 15-18, the carboxymethyl cellulose derivatives used in the polyethylene paper preparation process differed. In Example 17, unmodified carboxymethyl cellulose was added. In Examples 15 and 16, the modifiers used in the carboxymethyl cellulose modification process differed. After 10 washes, the hydrostatic pressure of the fabrics obtained in Examples 15-17 dropped below 8000 mmH2O, and the moisture permeability increased significantly. In Example 18, no carboxymethyl cellulose derivative was added, yet the resulting fabric showed a significant decrease in hydrostatic pressure and an increase in moisture permeability after 10 washes. This demonstrates that adding carboxymethyl cellulose derivatives to waste high-density polyethylene plastic helps improve the waterproof performance of the fabric and prevents the fibers in the polyethylene paper from becoming loose after multiple washes, which would lead to a loose structure and enlarged micropores, thus reducing waterproof performance and significantly increasing moisture permeability.

[0141] Experimental Example 3

[0142] Referring to the standard ISO13937-2-2000 Textiles—Tear properties of fabrics, the fabrics obtained in Examples 11 and 19-21 were tested to evaluate the performance of the PUR moisture-curing hot melt adhesive. The results are shown in Table 3 below.

[0143] Table 3

[0144] Group Tear-resistant (N) Tear strength (N) after 10 washes Example 11 42.7 40.2 Example 19 39.8 35.6 Example 20 37.5 33.0 Example 21 33.4 30.8

[0145] As shown in Table 3, in Example 21, no N-phenylethanolamine and butanetetracarboxylic acid were added during the preparation of the PUR moisture-curing hot melt adhesive, and the tear strength of the resulting fabric was only 32.7 N. In contrast, the tear strength of the fabric obtained in Example 11 was over 50 N, which was significantly higher than that of Example 21. Even after 10 washes, the tear strength of the fabric obtained in Example 11 was still significantly higher than that of Example 21. It can be seen that the addition of a certain amount of N-phenylethanolamine and butanetetracarboxylic acid during the preparation of the PUR moisture-curing hot melt adhesive in this application helps to improve the adhesion and washability of the hot melt adhesive.

[0146] In Examples 10 and 21, only N-phenylethanolamine or butanetetracarboxylic acid was added during the preparation of the PUR moisture-curing hot melt adhesive. The initial tear strength and tear strength after 10 washes of the resulting fabric were lower than those in Example 11. It can be seen that although adding N-phenylethanolamine or butanetetracarboxylic acid during the preparation of hot melt adhesive helps to improve adhesion, the effect on the improvement of water resistance is poor. Only by adding both N-phenylethanolamine and butanetetracarboxylic acid can both adhesion and water resistance be improved.

[0147] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, this application is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope of this application should be within the protection scope of this application.

Claims

1. A method for preparing polyethylene paper using waste high-density polyethylene plastic, characterized by, It comprises the following steps: The waste high-density polyethylene plastic is washed, crushed, then soaked in a soaking solution, washed with water and dried, then dissolved in a solvent with a carboxymethyl cellulose derivative to obtain a spinning solution, and finally polyethylene paper is prepared by flash evaporation; wherein, The soaking solution uses water as a solvent and contains a surfactant, table salt and malic acid; The carboxymethyl cellulose derivative is prepared by modifying sodium carboxymethyl cellulose with succinic acid monomethyl chloride and coconut oil chloride; In the preparation process of the carboxymethyl cellulose derivative, the amount of succinic acid monomethyl chloride is greater than or equal to 2 times and less than or equal to 5 times the mass of the sodium carboxymethyl cellulose, the amount of coconut oil chloride is greater than or equal to 0.5 times and less than or equal to 1 times the mass of the sodium carboxymethyl cellulose, and the preparation method of the carboxymethyl cellulose derivative is to add sodium carboxymethyl cellulose to n-heptane, add succinic acid monomethyl chloride and coconut oil chloride, react at a temperature greater than or equal to 50 DEG C and less than or equal to 65 DEG C, the reaction time is greater than or equal to 3 h and less than or equal to 5 h, filter after the reaction, wash with n-heptane, and dry to obtain.

2. The method of claim 1, wherein, The amount of the carboxymethyl derivative is greater than or equal to 4% and less than or equal to 8% of the mass of the waste high-density polyethylene plastic.

3. A polyethylene paper, characterized by, Prepared by the method of any one of claims 1-2.

4. The use of the polyethylene paper of claim 3 in the preparation of a high water pressure resistant fabric.

5. A high water pressure resistant fabric, characterized by, The high water pressure resistant fabric comprises a surface layer, an intermediate layer and a bottom layer, and the polyethylene paper of claim 3 is used. The fabric of the bottom layer is a 20D polyamide warp-knitted fabric, the fabric of the intermediate layer is the polyethylene paper, and the fabric of the surface layer is a 75D high-density high-F-number polyester DTY as warp and weft yarns. The surface layer and the intermediate layer, and the intermediate layer and the bottom layer are respectively attached by a PUR moisture-cured hot melt adhesive. The surface layer fabric is also subjected to water-repellent and calendering finishing.

6. The high water pressure resistant fabric of claim 5, wherein, The PUR moisture-cured hot melt adhesive is prepared by the following method: Dehydrated polyester polyol and diisocyanate are mixed, antioxidants and catalysts are added, the reaction temperature is greater than or equal to 85 DEG C and less than or equal to 90 DEG C, the reaction time is greater than or equal to 50 min and less than or equal to 70 min, a prepolymer is obtained, then a chain extender, N-phenylethanolamine and butane tetracarboxylic acid are added, the reaction is carried out at a temperature greater than or equal to 75 DEG C and less than or equal to 85 DEG C, the reaction time is greater than or equal to 30 min and less than or equal to 50 min, finally a curing agent is added, stirring is carried out at a temperature greater than or equal to 50 DEG C and less than or equal to 55 DEG C, the time is greater than or equal to 10 min and less than or equal to 20 min, and the PUR moisture-cured hot melt adhesive is obtained.

7. The high water pressure resistant fabric of claim 6, wherein, In the preparation process of the PUR moisture curing hot melt adhesive, the amount of the polyester polyol is greater than or equal to 80 parts and less than or equal to 100 parts, the amount of the diisocyanate is greater than or equal to 50 parts and less than or equal to 70 parts, the amount of the antioxidant is greater than or equal to 2 parts and less than or equal to 3 parts, the amount of the catalyst is greater than or equal to 0.5 parts and less than or equal to 1 part, the amount of the chain extender is greater than or equal to 1 part and less than or equal to 3 parts, the amount of the N-phenylethanolamine is greater than or equal to 0.5 parts and less than or equal to 0.8 parts, the amount of the butane tetracarboxylic acid is greater than or equal to 0.2 parts and less than or equal to 0.3 parts, and the amount of the curing agent is greater than or equal to 10 parts and less than or equal to 15 parts.

8. The method of any one of claims 5-7, wherein, The PUR moisture-curing hot melt adhesive is used in an amount greater than or equal to 6 g / m 2 and less than or equal to 8 g / m 2 .

Images