High-transmittance-strength flash evaporation material and preparation method thereof

Abstract

The invention relates to a flash evaporation material with high transparent strength and a preparation method thereof, the flash evaporation material comprises the following raw materials: polyethylene with high transparent strength of 0.2-3 kN / m; the high-permeability strength is equal to the moisture permeability index * the longitudinal tensile strength; the test standard of the tensile strength is a constant-speed tensile method for testing the tensile strength of paper and paperboards according to GBT 12914-2018; the test standard of the moisture permeability index is GB / T 11048-2018 determination of thermal resistance and moisture resistance (evaporation hot plate method) under the physiological comfort steady state condition of the textile. The flash evaporation material disclosed by the invention has relatively good high-transmittance strength.

Description

[Technical Field]

[0001] This invention relates to the field of textile production technology, specifically to a high-permeability flash evaporation material and its preparation method. [Background Technology]

[0002] Flash evaporation technology is a method for producing nonwoven fabrics with unique properties. This article provides an overview of its technical principles, performance characteristics, and application areas.

[0003] The technical principle of flash spinning materials: Flash spinning nonwoven fabric technology is mainly based on the principle of flash spinning. In this process, the polymer solution is rapidly heated to above its boiling point at a high temperature, forming polymer vapor. Subsequently, the vapor is rapidly cooled and solidified in a low-temperature environment, forming ultrafine fibers. These ultrafine fibers are transported by high-speed airflow and deposited on a collector to form a nonwoven fabric.

[0004] Performance characteristics of flash materials:

[0005] Microfiber: Flash nonwoven fabric is composed of microfiber, which has excellent softness, moisture absorption and breathability.

[0006] High strength: With appropriate post-processing, flash nonwoven fabrics can achieve high tensile strength and tear strength.

[0007] Excellent filtration performance: Due to its unique fiber structure and pore distribution, flash nonwoven fabric has broad application prospects in the filtration field.

[0008] Environmental friendliness: The solvents used in the production process of flash nonwoven fabric can be completely recycled and reused, reducing environmental pollution.

[0009] Applications of flash evaporation materials:

[0010] Flash-blown nonwoven fabrics are widely used in medical and health fields, filter materials, packaging materials, automotive interiors, and household goods. Due to their excellent moisture absorption and breathability, they are also commonly used in the production of disposable hygiene products such as sanitary napkins and diapers.

[0011] In summary, flash evaporation nonwoven fabric technology is an efficient and environmentally friendly production method that can produce nonwoven fabrics with unique properties and is widely used in many fields.

[0012] Currently, flash-evaporated materials face a trade-off between high permeability and high strength. High permeability leads to a decrease in strength, primarily because permeability increases the gaps between flash-evaporated fibers or increases the size of individual gaps. More or larger gaps make the fibers more prone to breakage under stress, resulting in reduced strength. Therefore, this application seeks to strike a balance between moisture permeability and longitudinal tensile strength, aiming to obtain a flash-evaporated material with suitable high permeability and strength. [Summary of the Invention]

[0013] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-permeability flash evaporation material and its preparation method.

[0014] The objective of this invention is achieved through the following technical solution:

[0015] A high-permeability flash evaporation material, characterized in that its raw material contains polyethylene, and its high permeability is 0.2-3 kN / m;

[0016] High permeability strength = moisture permeability index * longitudinal tensile strength;

[0017] The standard for testing tensile strength is GB / T 12914-2018 Determination of tensile strength of paper and paperboard by constant rate tensile test.

[0018] The test standard for moisture permeability index is GB / T 11048-2018 Determination of thermal and moisture resistance of textiles under steady-state conditions for physiological comfort (evaporative hot plate method).

[0019] The high transmittance is 0.3–0.5 kN / m.

[0020] The high transmittance is 0.5–0.7 kN / m.

[0021] The high transmittance is 0.7–0.9 kN / m.

[0022] The high transmittance is 0.9–1.1 kN / m.

[0023] The high transmittance is 1.1 to 1.3 kN / m.

[0024] The high transmittance is 1.3 to 1.5 kN / m.

[0025] The high transmittance is 1.5–1.7 kN / m.

[0026] The high transmittance is 1.7–1.9 kN / m.

[0027] The high transmittance is 1.9–2.1 kN / m.

[0028] The high transmittance is 2.1–2.3 kN / m.

[0029] The high transmittance is 2.3–2.5 kN / m.

[0030] The high transmittance is 2.5–2.7 kN / m.

[0031] The high transmittance is 2.7–2.9 kN / m.

[0032] The moisture permeability index of flash evaporation materials is 0.1 to 0.25.

[0033] The moisture permeability index of flash evaporation materials is 0.1 to 0.13.

[0034] The moisture permeability index of the flash evaporation material is 0.13 to 0.15.

[0035] The moisture permeability index of the flash evaporation material is 0.15 to 0.17.

[0036] The moisture permeability index of flash evaporation materials is 0.17 to 0.2.

[0037] The moisture permeability index of flash evaporation materials is 0.2 to 0.23.

[0038] The moisture permeability index of the flash evaporation material is 0.23 to 0.25.

[0039] The weight of the flash evaporation material is greater than 30 g / m³ 2 .

[0040] The weight of the flash material is less than 160 g / m³ 2 .

[0041] A high-permeability flash evaporation material further comprises a high-permeability powder, wherein the high-permeability powder is expanded graphite and TiN nanotubes;

[0042] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.5% to 1%.

[0043] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0044] I. Preparation of Flash Spinning Solution

[0045] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0046] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.5% to 1%;

[0047] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 8% to 12%.

[0048] In high-transparency powders, the mass ratio of expanded graphite to TiN nanotubes is 1:0.8 to 1:1.2.

[0049] The spinning solvent is selected from aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, unsaturated hydrocarbons, halogenated hydrocarbons, alcohols, esters, ethers, ketones, nitriles, amides, fluorocarbons, and similar substances.

[0050] II. Preparation of flash evaporation materials

[0051] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0052] The flash spinning temperature is 190–220℃.

[0053] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0054] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0055] This application employs segmented hot rolling and hot pressing to improve the tensile strength of flash materials while maintaining their moisture permeability.

[0056] The nano-reinforcement effect of TiN nanotubes in this application: Due to their small size, TiN nanotubes have a large specific surface area, which allows them to be more uniformly dispersed in the matrix material, forming more contact points, creating stronger physical bonding, and improving the tensile strength of the material.

[0057] The pore structure of expanded graphite in this application: Expanded graphite has a network-like microporous structure with multi-level pores. These pores are formed during the expansion process, providing a large number of open pores and internal interconnected pores, which enhances the moisture permeability of the flash material.

[0058] Compared with the prior art, the positive effects of the present invention are:

[0059] This application demonstrates the synergistic effect of expanded graphite and TiN nanotubes in flash-evaporated materials. The one-dimensional structure of TiN nanotubes and the two-dimensional layered structure of expanded graphite form a three-dimensional network, and this structural complementarity enhances the tensile strength of the material. The nanotubes are distributed between the graphite layers, forming additional reinforcing nodes, increasing interfacial interaction forces, and improving overall tensile strength. Titanium nitride nanotubes, as excellent stress transfer pathways, synergize with the porous structure of expanded graphite to more effectively disperse and transfer external forces, reducing local stress concentration, lowering the risk of crack formation, and enhancing the toughness and tensile strength of the material. Simultaneously, the porous structure of expanded graphite allows the material to resist plastic deformation while maintaining a certain level of air permeability, thus achieving a balance between longitudinal tensile strength and moisture permeability. [Attached Image Description]

[0060] Figure 1 SEM image of the flash material in Example 2.

Detailed Implementation Methods

[0061] The following provides a specific embodiment of a high-permeability flash evaporation material and its preparation method according to the present invention.

[0062] Example 1

[0063] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0064] I. Preparation of Flash Spinning Solution

[0065] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0066] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.5%;

[0067] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 8%.

[0068] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:0.8;

[0069] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0070] II. Preparation of flash evaporation materials

[0071] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0072] The flash spinning temperature is 190–220℃.

[0073] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0074] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0075] This application employs segmented hot rolling and hot pressing to improve the tensile strength of flash materials while maintaining their moisture permeability.

[0076] The nano-reinforcement effect of TiN nanotubes in this application: Due to their small size, TiN nanotubes have a large specific surface area, which allows them to be more uniformly dispersed in the matrix material, forming more contact points, creating stronger physical bonding, and improving the tensile strength of the material.

[0077] The pore structure of expanded graphite in this application: Expanded graphite has a network-like microporous structure with multi-level pores. These pores are formed during the expansion process, providing a large number of open pores and internal interconnected pores, which enhances the moisture permeability of the flash material.

[0078] The test results of this Example 1 are shown in Table 1.

[0079] Example 2

[0080] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0081] I. Preparation of Flash Spinning Solution

[0082] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0083] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.75%;

[0084] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 10%.

[0085] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:1;

[0086] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0087] II. Preparation of flash evaporation materials

[0088] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0089] The flash spinning temperature is 190–220℃.

[0090] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0091] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0092] The test results of this embodiment 2 are shown in Table 1. Figure 1 This is a SEM image of the cross-section of the flash material.

[0093] Example 3

[0094] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0095] I. Preparation of Flash Spinning Solution

[0096] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0097] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 1%;

[0098] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 12%.

[0099] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:1.2;

[0100] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0101] II. Preparation of flash evaporation materials

[0102] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0103] The flash spinning temperature is 190–220℃.

[0104] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0105] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0106] The test results of Example 3 are shown in Table 1.

[0107] Comparative Example 1

[0108] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0109] I. Preparation of Flash Spinning Solution

[0110] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0111] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.25%;

[0112] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 10%.

[0113] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:1;

[0114] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0115] II. Preparation of flash evaporation materials

[0116] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0117] The flash spinning temperature is 190–220℃.

[0118] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0119] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0120] The test results for Comparative Example 1 are shown in Table 1.

[0121] Comparative Example 2

[0122] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0123] I. Preparation of Flash Spinning Solution

[0124] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0125] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 2%;

[0126] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 10%.

[0127] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:1;

[0128] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0129] II. Preparation of flash evaporation materials

[0130] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0131] The flash spinning temperature is 190–220℃.

[0132] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0133] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0134] The test results of Comparative Example 2 are shown in Table 1.

[0135] Comparative Example 3

[0136] A method for preparing a high-permeability flash evaporation material, comprising the following technical solution:

[0137] I. Preparation of Flash Spinning Solution

[0138] After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution.

[0139] The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 2.5%;

[0140] The mass fraction of the mixture of high-permeability powder and polyethylene in the flash spinning solution is 10%.

[0141] In the high-transparency powder, the mass ratio of expanded graphite to TiN nanotubes is 1:1;

[0142] The spinning solvent is cyclohexane, 1H-perfluoroheptane, and water, with a mass ratio of 8:1:1.

[0143] II. Preparation of flash evaporation materials

[0144] The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, and then subjected to hot rolling and hot pressing processes to obtain flash materials.

[0145] The flash spinning temperature is 190–220℃.

[0146] Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

[0147] Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

[0148] The test results for Comparative Example 3 are shown in Table 1.

[0149] Figure 1 Test Result Data Table of this Application

[0150] High transmittance kN / m Moisture permeability index Example 1 0.45 0.12 Example 2 0.89 0.18 Example 3 1.35 0.23 Comparative Example 1 0.12 0.08 Comparative Example 2 1.88 0.33 Comparative Example 3 2.41 0.41

[0151] 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 high-permeability flash evaporation material, characterized in that, Its raw materials include polyethylene, with a high permeability of 0.2–3 kN / m; High permeability strength = moisture permeability index * longitudinal tensile strength; The standard for testing tensile strength is GB / T 12914-2018 Determination of tensile strength of paper and paperboard by constant rate tensile test. The test standard for moisture permeability index is GB / T 11048-2018 Determination of thermal and moisture resistance of textiles under steady-state conditions for physiological comfort (evaporative hot plate method).

2. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 0.3–0.5 kN / m.

3. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 0.5–0.7 kN / m.

4. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 0.7–0.9 kN / m.

5. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 0.9–1.1 kN / m.

6. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 1.1 to 1.3 kN / m.

7. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 1.3 to 1.5 kN / m.

8. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 1.5–1.7 kN / m.

9. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 1.7–1.9 kN / m.

10. A high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 1.9–2.1 kN / m.

11. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 2.1–2.3 kN / m.

12. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 2.3–2.5 kN / m.

13. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 2.5–2.7 kN / m.

14. The high-permeability flash evaporation material according to claim 1, characterized in that, The high transmittance is 2.7–2.9 kN / m.

15. The high-permeability flash evaporation material according to claim 1, characterized in that, The moisture permeability index of flash evaporation materials is 0.1 to 0.

25.

16. The high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of flash evaporation materials is 0.1 to 0.

13.

17. The high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of the flash evaporation material is 0.13 to 0.

15.

18. A high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of the flash evaporation material is 0.15 to 0.

17.

19. A high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of flash evaporation materials is 0.17 to 0.

2.

20. A high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of flash evaporation materials is 0.2 to 0.

23.

21. A high-permeability flash evaporation material according to claim 15, characterized in that, The moisture permeability index of the flash evaporation material is 0.23 to 0.

25.

22. The high-permeability flash evaporation material according to claim 1, characterized in that, The high-permeability flash evaporation material also includes high-permeability powder, which is expanded graphite and TiN nanotubes.

23. The high-permeability flash evaporation material according to claim 22, characterized in that, The mass fraction of high-transparency powder in the mixture of high-transparency powder and polyethylene is 0.5% to 1%.

24. The high-permeability flash evaporation material according to claim 22, characterized in that, In high-transparency powders, the mass ratio of expanded graphite to TiN nanotubes is 1:0.8 to 1:1.

2.

25. The high-permeability flash evaporation material according to claim 1, characterized in that, The weight of the flash evaporation material is greater than 30 g / m³ 2 .

26. The high-permeability flash evaporation material according to claim 1, characterized in that, The weight of the flash material is less than 160 g / m³ 2 .

27. The method for preparing a high-permeability flash evaporation material according to claim 1, characterized in that, The technical steps involved are as follows: I. Preparation of Flash Spinning Solution After grinding expanded graphite and TiN nanotubes, a high-transparency powder is obtained. The high-transparency powder and polyethylene are added to the spinning solvent to obtain a flash spinning solution. II. Preparation of flash evaporation materials The flash spinning solution prepared in step one is flash spun to obtain flash fibers. The flash fibers are then laid into a web, followed by hot rolling and hot pressing processes to obtain the flash material.

28. The method for preparing a high-permeability flash evaporation material according to claim 27, characterized in that, The mass fraction of the mixture of high-transparency powder and polyethylene in the flash spinning solution is 8% to 12%.

29. The method for preparing a high-permeability flash evaporation material according to claim 27, characterized in that, Hot rolling is divided into preheating rolling and hot rolling. The roll temperature of preheating rolling is 95±1℃, and the roll temperature of hot rolling is 100±1℃.

30. The method for preparing a high-permeability flash evaporation material according to claim 27, characterized in that, Hot pressing is divided into preheating pressing and hot pressing. The roller temperature for preheating pressing is 105±1℃, and the roller temperature for hot pressing is 110±1℃.

Images