PET (Polyethylene Terephthalate) spunlace honeycomb filter material and preparation process thereof

Abstract

The invention discloses a PET spunlace honeycomb type filter material and a preparation technology, and belongs to the technical field of filter materials, the PET spunlace honeycomb type filter material comprises a base layer and a honeycomb type structure layer arranged on the base layer, the base layer is made of PET fibers through a spunlace technology, the honeycomb type structure layer is composed of a plurality of hexagonal honeycomb hole grids, the side length of each honeycomb hole grid is 0.5-2 mm, and the side length of each honeycomb hole grid is 0.5-2 mm. The method comprises the following steps: preparing raw materials: selecting PET (Polyethylene Terephthalate) fibers, performing opening and mixing treatment, adding a functional auxiliary agent according to needs, uniformly mixing, carding the mixed fibers into a fiber web with the gram weight of 50-300g / m by adopting a carding machine, conveying the fiber web into a spunlace machine, and performing spunlace under the pressure of 5-50MPa for 1-5 times, a honeycomb jet pattern is formed on a fiber net through a specially designed spunlace head, a honeycomb structure is formed, the spunlaced filter material is dried, the drying temperature is 80-150 DEG C, and the drying time is 5-30 minutes.

Description

Technical Field

[0001] The invention relates to an assembly positioning mechanism, in particular to a PET hydroentangled honeycomb filter material and a preparation process thereof, belonging to the technical field of assembly positioning mechanisms. Background Art

[0002] Filter materials play a vital role in many fields of industrial production and environmental protection.

[0003] There are many types of filter media available, however, some filter media are insufficient in terms of filtration efficiency, air permeability, strength and dust holding capacity.

[0004] For example, the structure of some filter materials is not reasonable enough, resulting in greater resistance during filtration, affecting the ventilation effect; or the strength is low, which makes it easy to break during long-term use, shortening the service life of the filter material.

[0005] Therefore, it is of great practical significance to develop a filter material with high efficiency filtering performance, good air permeability and high strength. Summary of the Invention

[0006] The main purpose of the present invention is to provide a PET hydroentangled honeycomb filter material and a preparation process.

[0007] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] A PET hydroentangled honeycomb filter material, comprising a base layer and a honeycomb structure layer arranged on the base layer;

[0009] The base layer is made of PET fiber through a hydroentanglement process;

[0010] The honeycomb structure layer is composed of a plurality of hexagonal honeycomb cells, each of which has a side length of 0.5-2 mm, and adjacent honeycomb cells are connected by fibers.

[0011] Preferably, a functional additive is added to the honeycomb structure layer, and the functional additive includes at least one of an antibacterial agent, an antistatic agent, and a flame retardant.

[0012] Preferably, the antibacterial agent is a nano-titanium dioxide antibacterial agent with a particle size of 50 nm;

[0013] The antistatic agent includes a quaternary ammonium salt compound or a conductive fiber, and the conductive fiber is a carbon nanotube composite PET fiber with a surface resistance of less than 10 6 Ω;

[0014] The flame retardant is a compound system of decabromodiphenylethane and antimony trioxide, and the compound mass ratio is 3:2.

[0015] A process for preparing PET hydroentangled honeycomb filter material comprises the following steps:

[0016] Raw material preparation: Select PET fibers, open and mix them, add functional additives as needed and mix them evenly;

[0017] Web forming: Use a carding machine to card the mixed fibers into a fiber web with a gram weight of 50-300g / m²;

[0018] Hydroentanglement: The fiber web is conveyed to the hydroentanglement machine with a hydroentanglement pressure of 5-50 MPa and 1-5 times of hydroentanglement. A specially designed hydroentanglement head forms a honeycomb jet pattern on the fiber web to form a honeycomb structure.

[0019] Drying and shaping: Dry the filter material after hydroentanglement at a temperature of 80-150°C for 5-30 minutes, and then shape it.

[0020] Post-processing: The filter material can be subjected to surface coating, printing, oil-repellent finishing, softening finishing or wear-resistant treatment as needed.

[0021] Preferably, in the web forming step, the carding speed of the carding machine is 30-800 r / min, the spacing between the cylinder and the doffer is 0.3-0.5 mm, and the cover speed is 80-100 mm / min.

[0022] Preferably, the temperature of the shaping treatment is 120-140° C., the pressure is 0.2-0.4 MPa, and the shaping time is 8-15 minutes.

[0023] Preferably, the oil-repellent finishing adopts a fluorine-containing oil-repellent finishing agent, is processed by a padding process, the padding rate is controlled at 60%, and is baked at 150° C. for 3 minutes.

[0024] Preferably, the softening finishing is performed by using an organic silicon softener through an immersion process for 15 minutes, followed by drying at 140° C. for 10 minutes.

[0025] Preferably, the wear-resistant treatment uses a polyurethane wear-resistant coating, which is applied by a spraying process, with the coating thickness controlled at 0.05 mm, and cured at 160° C. for 15 minutes.

[0026] Preferably, in the honeycomb spray pattern of the water jet head, the spacing between adjacent honeycomb cells is 0.2-0.5 mm, and the water jet frequency is 1000 times / minute.

[0027] Beneficial technical effects of the present invention:

[0028] The present invention provides a PET hydroentangled honeycomb filter material and a preparation process thereof. The honeycomb structure increases the surface area of the filter material, enabling the filter material to more effectively capture particulate pollutants in the air, thereby improving the filtration efficiency.

[0029] Good air permeability: The design of the honeycomb grid ensures the air permeability of the filter material, allowing air to pass through the filter material smoothly and reducing the filtration resistance.

[0030] High strength: PET fiber itself has high strength, and the reinforcement effect of the hydroentanglement process makes the filter material have good tensile strength and tear strength, extending the service life of the filter material.

[0031] High dust holding capacity: The honeycomb structure can hold more dust and particulate pollutants, which increases the dust holding capacity of the filter material and reduces the frequency of filter material replacement.

[0032] Diverse functions: By adding functional additives, the filter material can have multiple functions such as antibacterial, antistatic and flame retardant to meet the use needs of different fields.

[0033] The preparation process of the present invention is simple and feasible. By adjusting the spray pattern and process parameters of the water jet head, PET water jet honeycomb filter materials with different specifications and performances can be prepared, which is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flowchart of a preferred embodiment of a PET hydroentangled honeycomb filter material and a preparation process. DETAILED DESCRIPTION

[0035] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below with reference to embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0036] The process steps for preparing the above-mentioned PET spunlace honeycomb filter material are as follows:

[0037] Raw material preparation: Select PET fibers, open and mix them to fully disperse the fibers. If needed, add appropriate amounts of functional additives such as antimicrobial agents and antistatic agents to the fibers and mix them evenly.

[0038] Web Forming: A carding machine is used to comb the mixed fibers into a uniform fiber web. The weight of the fiber web can be adjusted according to the requirements of the filter material, generally 50-300g / m².

[0039] Hydroentanglement: The fiber web is fed into a hydroentanglement machine for hydroentanglement. The hydroentanglement pressure is 5-50 MPa, and the number of hydroentanglements is 1-5. During the hydroentanglement process, a specially designed hydroentanglement head creates a honeycomb-like spray pattern on the fiber web, forming a honeycomb structure within the web.

[0040] Drying and shaping: The spunlace filter media is dried to remove moisture. The drying temperature is 80-150°C and the drying time is 5-30 minutes. After drying, the filter media is shaped to solidify the honeycomb structure and improve its dimensional stability.

[0041] Post-processing: As needed, the filter material can be post-processed, such as surface coating and printing, to further improve the performance and appearance of the filter material.

[0042] Example 1

[0043] (1) Raw material preparation

[0044] Select 100 kg of PET fiber, add 2 kg of antibacterial agent, and mix well.

[0045] (2) Network formation

[0046] The mixed fibers are combed into a fiber web with a gram weight of 100 g / m² using a carding machine.

[0047] (3) Hydroentanglement reinforcement

[0048] The fiber web was conveyed to the hydroentanglement machine with a hydroentanglement pressure of 20 MPa and a hydroentanglement frequency of 2 times. The spray pattern of the hydroentanglement head was honeycomb, and the side length of each honeycomb cell was 1 mm.

[0049] (4) Drying and shaping

[0050] The spunlace filter material is dried at 120°C for 15 minutes and then subjected to shaping treatment. (V) Post-treatment

[0051] The filter material is surface coated to improve its waterproof performance.

[0052] The prepared PET hydroentangled honeycomb filter material has good antibacterial performance, high filtration efficiency, good air permeability and high strength.

[0053] Example 2

[0054] (1) Raw material preparation

[0055] Select 150kg of PET fiber, add 3kg of antistatic agent, and mix well.

[0056] (2) Network formation

[0057] The mixed fibers are combed into a fiber web with a gram weight of 150 g / m² using a carding machine.

[0058] (3) Hydroentanglement reinforcement

[0059] The fiber web was conveyed to the hydroentanglement machine with a hydroentanglement pressure of 30 MPa and a hydroentanglement frequency of 3 times. The spray pattern of the hydroentanglement head was honeycomb, and the side length of each honeycomb cell was 1.5 mm.

[0060] (4) Drying and shaping

[0061] The spunlace filter material was dried at 130° C. for 20 minutes and then subjected to a shaping treatment.

[0062] (V) Post-processing

[0063] The filter material is printed to improve its appearance.

[0064] The prepared PET hydroentangled honeycomb filter material has good anti-static performance, high filtration efficiency and dust holding capacity, and is suitable for use in fields such as electronics and precision instruments that are sensitive to static electricity.

[0065] Example 3

[0066] (1) Raw material preparation

[0067] 80kg of PET fiber, 5kg of flame retardant, and 3kg of UV stabilizer were thoroughly mixed. The flame retardant was a combination of decabromodiphenylethane and antimony trioxide, with a mass ratio of 3:2. The UV stabilizer was a hindered amine light stabilizer, which effectively resists the aging effects of UV rays on the filter material.

[0068] (2) Network formation

[0069] The mixed fibers were combed into a fiber web with a gram weight of 80 g / m² using a carding machine. To ensure the uniformity of the fiber web, the carding speed of the carding machine was set to 30 m / min and the cylinder speed was 300 r / min.

[0070] (3) Hydroentanglement reinforcement

[0071] The fiber web was fed into the hydroentanglement machine, with the hydroentanglement pressure set at 15 MPa and the number of hydroentanglements set to 3. The hydroentanglement head uses a specially designed honeycomb injection mold. The side length of each honeycomb cell is 0.8 mm, and the spacing between adjacent cells is 0.2 mm, ensuring the formation of a regular honeycomb structure.

[0072] (4) Drying and shaping

[0073] The spunlace filter material is sent to a drying oven, the drying temperature is set at 100°C, and the drying time is 25 minutes. After the moisture is fully removed, it is shaped in a setting machine at a temperature of 130°C and a pressure of 0.3MPa for 10 minutes to stabilize the honeycomb structure.

[0074] (V) Post-processing

[0075] The filter material is subjected to oil-repellent finishing using a fluorine-containing oil-repellent finishing agent. The finishing agent is attached to the surface of the filter material through a padding process, the padding rate is controlled at 60%, and then baked at 150°C for 3 minutes to give the filter material good oil-repellent properties.

[0076] The prepared PET hydroentangled honeycomb filter material has been tested to have a limiting oxygen index of 32%, and has good flame retardant properties; after 200 hours of ultraviolet irradiation, the strength retention rate still reaches 85%, with significant anti-UV effect; at the same time, the contact angle for oily stains of motor oil is greater than 110°, with excellent oil repellency, making it suitable for outdoor and industrial oil filtration scenarios.

[0077] Example 4

[0078] (1) Raw material preparation

[0079] Prepare 120kg of PET fiber, 4kg of nano-titanium dioxide antimicrobial agent, and 2kg of moisturizer. The nano-titanium dioxide antimicrobial agent has a particle size of 50nm and exhibits high antimicrobial properties. Use glycerin as the moisturizer to improve the filter media's performance in humid environments. Thoroughly mix all ingredients in a mixer for 30 minutes to ensure a uniform mixture.

[0080] (2) Network formation

[0081] The mixed fibers are combed into a fiber web with a gram weight of 120g / m² by a carding machine. When the carding machine is working, the doffer speed is 200r / min and the licker-in speed is 800r / min to ensure the fluffiness and uniformity of the fiber web.

[0082] (3) Hydroentanglement reinforcement

[0083] The fiber web was fed to the hydroentanglement machine, with the hydroentanglement pressure set to 25 MPa and the number of hydroentanglements set to 2. The hydroentanglement head's honeycomb jet pattern, with each cell having a side length of 1.2 mm, tightly entangled the fibers in the cells by precisely controlling the jet angle and force of the water jets.

[0084] (4) Drying and shaping

[0085] The spunlace filter material is dried in a drying device at a temperature of 110°C for 20 minutes, and then shaped in a setting machine at a temperature of 120°C and a pressure of 0.2 MPa for 15 minutes to stabilize the structure and size of the filter material.

[0086] (V) Post-processing

[0087] The filter material is softened and finished by using silicone softener. The softener is allowed to penetrate into the filter material fibers through an impregnation process for 15 minutes, and then dried at 140°C for 10 minutes to improve the feel and comfort of the filter material.

[0088] The PET spunlace honeycomb filter material prepared in this embodiment has an antibacterial rate of over 99% against Escherichia coli and Staphylococcus aureus. After being placed in an environment with a relative humidity of 80% for 48 hours, the strength of the filter material decreases by less than 5%, indicating good moisturizing performance. At the same time, it has a soft and smooth feel and is suitable for use in the fields of medical and sanitary products and clothing filter materials.

[0089] Example 5

[0090] (1) Raw material preparation

[0091] 180kg of PET fiber, 10kg of conductive fiber, and 6kg of antistatic agent were selected. The conductive fiber is made of carbon nanotube composite PET fiber, and its surface resistance is less than 10 6 Ω, which effectively removes static electricity; the antistatic agent is a quaternary ammonium salt compound, which works synergistically with the conductive fiber to enhance the antistatic properties of the filter material. The three raw materials were mixed in a high-speed blender for 40 minutes to evenly disperse the conductive fiber in the PET fiber.

[0092] (2) Network formation

[0093] The mixed fibers were combed into a fiber web with a weight of 200 g / m² using a carding machine. To ensure good uniformity of the fiber web, the carding machine's operating parameters were adjusted to: a cylinder-doffer distance of 0.3 mm and a flat plate speed of 80 mm / min.

[0094] (3) Hydroentanglement reinforcement

[0095] The fiber web was fed into the hydroentanglement machine, with the hydroentanglement pressure set at 35 MPa and the number of hydroentanglements set to 4. The honeycomb jet structure of the hydroentanglement head has a side length of 1.8 mm per cell. During the hydroentanglement process, the water jets are sprayed at a frequency of 1000 times per minute, ensuring that the fibers are fully entangled and form a solid honeycomb structure.

[0096] (4) Drying and shaping

[0097] The spunlace filter material is dried in a drying oven at 140°C for 10 minutes to quickly remove moisture, and then shaped in a setting machine at 140°C and 0.4 MPa for 8 minutes to stabilize the shape and structure of the filter material.

[0098] (V) Post-processing

[0099] The filter material is treated with wear-resistant polyurethane wear-resistant coating, which is evenly coated on the filter material surface through spraying process. The coating thickness is controlled at 0.05mm, and then cured at 160℃ for 15 minutes to improve the wear resistance of the filter material.

[0100] After testing, the surface resistance of the PET hydroentangled honeycomb filter material prepared in this embodiment is stable at 10 7 The antistatic performance is excellent. After 5000 frictions on the Martindale abrasion tester, there is no obvious fuzzing or damage on the surface, and the wear resistance is good. It is suitable for industrial filtration scenarios such as electronic manufacturing and chemical industry with high requirements for static electricity and wear resistance.

[0101] The above is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field can replace or change the technical solution and concept of the present invention within the scope disclosed by the present invention, which falls within the scope of protection of the present invention.

Claims

1. A PET hydroentangled honeycomb filter material, characterized by: It includes a base layer and a honeycomb structure layer arranged on the base layer; The base layer is made of PET fiber through a hydroentanglement process; The honeycomb structure layer is composed of a plurality of hexagonal honeycomb cells, each of which has a side length of 0.5-2 mm, and adjacent honeycomb cells are connected by fibers.

2. The PET hydroentangled honeycomb filter material according to claim 1, characterized in that: Functional additives are added to the honeycomb structure layer, and the functional additives include at least one of an antibacterial agent, an antistatic agent, and a flame retardant.

3. The PET hydroentangled honeycomb filter material according to claim 1, characterized in that: The antibacterial agent is a nano titanium dioxide antibacterial agent with a particle size of 50nm; The antistatic agent includes a quaternary ammonium salt compound or a conductive fiber, and the conductive fiber is a carbon nanotube composite PET fiber with a surface resistance of less than 10 6 Ω; The flame retardant is a compound system of decabromodiphenylethane and antimony trioxide, and the compound mass ratio is 3:

2.

4. A process for preparing a PET hydroentangled honeycomb filter material, based on the PET hydroentangled honeycomb filter material according to any one of claims 1 to 3, characterized in that: The steps include: Raw material preparation: Select PET fibers, open and mix them, add functional additives as needed and mix them evenly; Web forming: Use a carding machine to card the mixed fibers into a fiber web with a gram weight of 50-300g / m²; Hydroentanglement: The fiber web is conveyed to the hydroentanglement machine with a hydroentanglement pressure of 5-50 MPa and 1-5 times of hydroentanglement. A specially designed hydroentanglement head forms a honeycomb jet pattern on the fiber web to form a honeycomb structure. Drying and shaping: Dry the filter material after hydroentanglement at a temperature of 80-150°C for 5-30 minutes, and then shape it. Post-processing: The filter material can be subjected to surface coating, printing, oil-repellent finishing, softening finishing or wear-resistant treatment as needed.

5. A process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: In the web forming step, the carding speed of the carding machine is 30-800 r / min, the spacing between the cylinder and the doffer is 0.3-0.5 mm, and the cover speed is 80-100 mm / min.

6. The process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: The temperature of the shaping treatment is 120-140° C., the pressure is 0.2-0.4 MPa, and the shaping time is 8-15 minutes.

7. The process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: The oil-repellent finishing adopts a fluorine-containing oil-repellent finishing agent, is processed by a padding process, the padding rate is controlled at 60%, and is baked at 150° C. for 3 minutes.

8. The process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: The softening finishing adopts an organic silicon softener and is processed by an immersion process. The immersion time is 15 minutes, and then the surface is dried at 140° C. for 10 minutes.

9. The process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: The wear-resistant treatment uses a polyurethane wear-resistant coating, which is applied through a spraying process, with a coating thickness controlled at 0.05 mm and cured at 160° C. for 15 minutes.

10. The process for preparing PET hydroentangled honeycomb filter material according to claim 4, characterized in that: In the honeycomb spray pattern of the water jet head, the spacing between adjacent honeycomb cells is 0.2-0.5 mm, and the water jet frequency is 1000 times / minute.

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