Polyester filter material waterproof and wear-resistant treatment method and prepared filter material

Abstract

A polyester filter waterproof wear-resistant treatment method and polyester filter prepared thereby, comprising: 1, preparing a nano-SiO2 dispersion liquid by a microemulsion method, mixing water and nano-sized silica aerogel powder, adding a dispersing agent and a cosurfactant, and stirring on a temperature magnetic stirrer to obtain a nano-sized silica aerogel dispersion liquid; 2, adding a waterproof and oil-proof agent to the dispersion liquid prepared in step 1, and stirring on a magnetic stirrer to prepare a nano-sized silica aerogel / waterproof and oil-proof composite impregnating liquid for polyester nonwoven fabric; 3, preparing a needle felt, with a unit gram weight controlled at 500-600 g / m 2 ; 4, filter treatment, uniformly dispersing the composite impregnating liquid prepared in step 2 into the semi-finished needle felt in step 3 through an impregnation-pressing process, and obtaining a polyester dust removal filter with high wear resistance and waterproof performance through high-temperature heat setting. The present application realizes the simultaneous increase of the wear resistance and waterproof performance of the polyester filter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of filter bag preparation, in particular to the field of waterproof and wear-resistant treatment of polyester filter material. BACKGROUND

[0002] The polyester filter bag is prepared from polyester fiber, and generally has the advantages of high porosity, good air permeability, high dust collection efficiency and long service life, etc. The polyester filter bag can be used at 130 DEG C for a long time, and the instantaneous use temperature can reach 150 DEG C. The chemical stability of the polyester filter bag is also good, and it can resist strong acid and weak alkali. Importantly, the polyester filter material has very good wear resistance, so it is a variety with large use amount in felt filter materials. The polyester filter bag is often used for filtering various low-viscosity fluids such as petroleum chemical industry, automobile manufacturing, paint coating adhesive, paint, electronic technology, metal processing, water treatment, pharmaceuticals and beverages. It has excellent filtering effect on various types of impurities. Although the wear resistance of the polyester filter material itself is good, in the actual use process of some working conditions, due to the excessive filter air speed, the friction between the bag cage and the filter bag, and the mutual friction between the filter bags, the filter bag will be damaged due to long-term mechanical friction, thereby affecting the discharge efficiency. Therefore, in view of the market "pain point" of frequent damage of the polyester filter material, it is necessary to improve the wear resistance of the polyester filter material, and at the same time, most of the actual use conditions of the polyester filter material require waterproof and oil-proof treatment of the polyester filter material. While improving the wear resistance, the waterproof and oil-proof effect of the filter material should also be ensured. At present, there is a relatively mature waterproof and oil-proof process for filter material. Under normal circumstances, after the filter material is treated with waterproof and oil-proof agent, it cannot be treated with other agents, because the waterproof and oil-proof agent is easy to fail. SUMMARY

[0003] The technical problem to be solved by the present application is how to increase the wear resistance and waterproof performance of the polyester filter material at the same time.

[0004] The present application solves the above technical problems by the following technical means: a waterproof and wear-resistant treatment method for polyester filter material, comprising the following steps:

[0005] 1. Preparation of nano-silica aerogel

[0006] The nano-SiO2 dispersion liquid is prepared by microemulsion method, 100g-200g of tap water (for industrial application, the water used in the experiment is tap water) is mixed with 5-15g of nano-silica aerogel powder,

[0007] Add 1-5g dispersant (sodium dodecyl sulfate, sodium dodecyl sulfonate, polyvinyl pyrrolidone, OP emulsifier, etc.), add 2-4g co-surfactant (ethylene glycol, glycerol, n-butanol, polyvinyl alcohol, etc.), stir on a temperature magnetic stirrer for 25-35min, to obtain a nanoscale silica aerogel dispersion liquid;

[0008] 2. Preparation of nanoscale silica aerogel / water and oil repellent composite impregnating liquid

[0009] Add 5-15g water and oil repellent agent (2860-H) to the prepared nanoscale silica aerogel dispersion liquid, and stir on a magnetic stirrer for 25-35min to prepare a nanoscale silica aerogel / water and oil repellent composite impregnating liquid for polyester non-woven fabric;

[0010] 3. Preparation of needle felt

[0011] The polyester staple fibers are opened, mixed, fine opened, carded, laid, added with polyester base cloth, and needle punched to prepare a semi-finished needle felt, with a unit gram weight controlled at 500-600g / m 2 ;

[0012] 4. Filter treatment

[0013] The nanoscale silica aerogel / water and oil repellent composite impregnating liquid prepared in step 2 is uniformly dispersed into the semi-finished needle felt in step 3 through impregnation-pressing process, and high-temperature (180-200℃) heat setting is performed to obtain a polyester dust removal filter material with high wear resistance and waterproof performance;

[0014] The following steps can also be included:

[0015] 5. Performance test

[0016] The wear resistance and water and oil repellency of the dust removal filter material prepared in step 4 are tested.

[0017] The application also provides a polyester filter material prepared by the above-mentioned polyester filter material waterproof and wear-resistant treatment method.

[0018] The application has the following advantages:

[0019] (1) Nanoscale silica aerogel is selected and loaded into the gaps of polyester filter media fibers. Because nanoscale silica aerogel has uniformly distributed material-sized pores and high porosity, it is a high-efficiency gas filtration material. Due to its particularly large specific surface area, it can adsorb fine dust in the air, thereby achieving better filtration and adsorption. After entering the gaps of the filter media, silica aerogel acts as a filler between fibers, increasing the frictional mating surface and increasing wear resistance. While silica aerogel itself has the function of enhancing wear resistance, this is a property of silica aerogel itself. When used in coating or surface coating methods, it is indeed due to the effect of silica aerogel itself. This invention does not directly utilize the wear resistance of silica aerogel. This invention uses an emulsion impregnation method to fill the fiber gaps with silica aerogel rather than the fiber surface. The principle is to increase the frictional mating surface, thereby causing the overall surface of the filter media to "slip", thus increasing wear resistance.

[0020] (2) The microemulsion method is used to prepare nano-sized silica aerogel dispersions, which enables nano-sized silica aerogels to be effectively and uniformly dispersed in aqueous solutions for a long time (more than 2 hours), improving the actual loading efficiency and facilitating practical industrial applications.

[0021] (3) The waterproof and oil-repellent agent is mixed with the nano-sized silica aerogel dispersion. The silica aerogel dispersion and the waterproof and oil-repellent agent work synergistically to ensure the effectiveness of the waterproof and oil-repellent agent. This can effectively improve the wear resistance of the filter material and also ensure the waterproof and oil-repellent properties of the polyester filter material.

[0022] (4) This method enables the waterproof and oil-repellent agent and silica aerogel dispersion to form a stable system, resulting in a synergistic effect of wear resistance and waterproofing. The invention lies in the fact that waterproof and oil-repellent agents are easily affected and lose their waterproof and oil-repellent properties. By adding different types and amounts of surfactants and co-surfactants, a stable dispersion system is formed in the solution, which also ensures the performance of the waterproof and oil-repellent agent. Most waterproof and oil-repellent agents on the market cannot be mixed with any other additives, which will lead to the failure of waterproof performance. This invention adds different types and amounts of dispersants and co-surfactants and mixes them simultaneously. Under the premise of wear resistance, different co-surfactants are added to ensure the effect of the waterproof agent. This is also the main intention of this invention. On the basis of ensuring the wear resistance of each set of embodiments, the key point is that after adding appropriate co-surfactants (including the amount), the waterproof and oil-repellent effect is not affected. The influence of the type and amount of co-surfactants on the waterproof and oil-repellent performance has been verified by a large number of experiments.

[0023] In summary, the production process of this invention is simple, requires no special treatment of the filter material itself, facilitates rapid industrialization, and can increase the wear resistance and waterproof performance of polyester filter material. By using SiO2 aerogel wear-resistant filler, the gaps in the polyester filter material are filled with SiO2 aerogel, and the polyester filter material is treated with waterproof and oil-proof properties. Through the addition of additives, the synergistic effect of waterproof and wear-resistant properties is ensured, so that the polyester filter material has both wear resistance and waterproof properties. Attached Figure Description

[0024] Figure 1 These are water droplet state diagrams illustrating the waterproof performance of specific examples 1 and 5 of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Specific Example 1

[0027] 1. Preparation of nanoscale silica aerogel

[0028] Nanoscale SiO2 dispersions were prepared using a microemulsion method. 100g of tap water was mixed with 10g of nanoscale silica aerogel powder. 1g of dispersant—sodium dodecyl sulfate—and 2g of co-surfactant—ethylene glycol were added. The mixture was stirred for 30 minutes on a magnetic stirrer to obtain the nanoscale silica aerogel dispersion.

[0029] 2. Preparation of Nanoscale Silica Aerogel / Waterproof and Oil-Repellent Composite Impregnation Solution

[0030] Add 10g of waterproof and oil-repellent agent (2860-H) to the prepared nano-sized silica aerogel dispersion and stir on a magnetic stirrer for 30 minutes to prepare a nano-sized silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric.

[0031] 3. Preparation of needle-punched felt

[0032] Polyester staple fibers are processed through opening, mixing, fine opening, carding, web formation, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 550 g / m². 2 .

[0033] 4. Filter media treatment

[0034] The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process, and a polyester dust removal filter material with high wear resistance and waterproof performance is obtained by heat setting at 190℃.

[0035] 5. Performance Testing

[0036] The wear resistance and water and oil resistance of the dust removal filter material prepared in step 4 were tested.

[0037] Specific example 2:

[0038] 1. Preparation of nanoscale silica aerogel

[0039] Nanoscale SiO2 dispersions were prepared using a microemulsion method. 200g of tap water was mixed with 5g of nanoscale silica aerogel powder. 2g of dispersant—sodium dodecyl sulfonate—and 3g of co-surfactant—glycerol were added. The mixture was stirred for 35 minutes on a magnetic stirrer to obtain the nanoscale silica aerogel dispersion.

[0040] 2. Preparation of Nanoscale Silica Aerogel / Waterproof and Oil-Repellent Composite Impregnation Solution

[0041] Add 15g of waterproof and oil-repellent agent (2860-H) to the prepared nano-sized silica aerogel dispersion and stir on a magnetic stirrer for 35 minutes to prepare a nano-sized silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric.

[0042] 3. Preparation of needle-punched felt

[0043] Polyester staple fibers are processed through opening, mixing, fine opening, carding, web laying, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 600 g / m². 2 .

[0044] 4. Filter media treatment

[0045] The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process, and a polyester dust removal filter material with high wear resistance and waterproof performance is obtained by high temperature heat setting.

[0046] 5. Performance Testing

[0047] The wear resistance and water and oil resistance of the dust removal filter material prepared in step 4 were tested.

[0048] Specific example 3:

[0049] 1. Preparation of nanoscale silica aerogel

[0050] Nanoscale SiO2 dispersions were prepared using a microemulsion method. 160g of tap water was mixed with 5g of nanoscale silica aerogel powder. 1.5g of dispersant—polyvinylpyrrolidone—and 4g of co-surfactant n-butanol were added. The mixture was stirred for 25 minutes on a magnetic stirrer to obtain the nanoscale silica aerogel dispersion.

[0051] 2. Preparation of Nanoscale Silica Aerogel / Waterproof and Oil-Repellent Composite Impregnation Solution

[0052] Add 5g of waterproof and oil-repellent agent (2860-H) to the prepared nano-sized silica aerogel dispersion and stir on a magnetic stirrer for 25 minutes to prepare a nano-sized silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric.

[0053] 3. Preparation of needle-punched felt

[0054] Polyester staple fibers are processed through opening, mixing, fine opening, carding, web formation, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 500 g / m². 2 .

[0055] 4. Filter media treatment

[0056] The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process, and a polyester dust removal filter material with high wear resistance and waterproof performance is obtained by high temperature heat setting.

[0057] 5. Performance Testing

[0058] The wear resistance and water and oil resistance of the dust removal filter material prepared in step 4 were tested.

[0059] Specific Example 4

[0060] 1. Preparation of nanoscale silica aerogel

[0061] Nanoscale SiO2 dispersions were prepared using a microemulsion method. 130g of tap water was mixed with 10g of nanoscale silica aerogel powder. 1g of dispersant (OP emulsifier) ​​and 2g of co-surfactant (polyvinyl alcohol) were added. The mixture was stirred for 30 minutes on a magnetic stirrer to obtain the nanoscale silica aerogel dispersion.

[0062] 2. Preparation of Nanoscale Silica Aerogel / Waterproof and Oil-Repellent Composite Impregnation Solution

[0063] Add 10g of waterproof and oil-repellent agent (2860-H) to the prepared nano-sized silica aerogel dispersion and stir on a magnetic stirrer for 30 minutes to prepare a nano-sized silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric.

[0064] 3. Preparation of needle-punched felt

[0065] Polyester staple fibers are processed through opening, mixing, fine opening, carding, web formation, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 550 g / m². 2 .

[0066] 4. Filter media treatment

[0067] The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process, and a polyester dust removal filter material with high wear resistance and waterproof performance is obtained by heat setting at 190℃.

[0068] 5. Performance Testing

[0069] The wear resistance and water and oil resistance of the dust removal filter material prepared in step 4 were tested.

[0070] Specific example 5:

[0071] 1. Preparation of nanoscale silica aerogel

[0072] Nanoscale SiO2 dispersions were prepared using a microemulsion method. 150g of tap water was mixed with 10g of nanoscale silica aerogel powder. 5g of dispersant (OP emulsifier) ​​and 2g of co-surfactant (ethylene glycol) were added. The mixture was stirred for 30 minutes on a magnetic stirrer to obtain the nanoscale silica aerogel dispersion.

[0073] 2. Preparation of Nanoscale Silica Aerogel / Waterproof and Oil-Repellent Composite Impregnation Solution

[0074] Add 10g of waterproof and oil-repellent agent (2860-H) to the prepared nano-sized silica aerogel dispersion and stir on a magnetic stirrer for 30 minutes to prepare a nano-sized silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric.

[0075] 3. Preparation of needle-punched felt

[0076] Polyester staple fibers are processed through opening, mixing, fine opening, carding, web formation, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 550 g / m². 2 .

[0077] 4. Filter media treatment

[0078] The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process. The polyester dust removal filter material with high wear resistance and waterproof performance is obtained by heat setting at a high temperature of 190℃.

[0079] 5. Performance Testing

[0080] The wear resistance and water and oil resistance of the dust removal filter material prepared in step 4 were tested.

[0081] In the above specific examples

[0082] The testing instrument was a Martindale abrasion tester, and the specimen was a circular specimen inside the fixture.

[0083] The test method is as follows: Under a specified load, the sample is rubbed against an abrasive (i.e., a standard fabric) with a planar motion that follows a Lissajious pattern. The sample fixture can rotate freely around its axis perpendicular to the horizontal plane. The abrasion resistance of the fabric is determined according to the mass loss method.

[0084] Abrasion resistance index = n / Δm

[0085] Where: n: total number of friction cycles, in times;

[0086] Δm: Mass loss of the sample under the total number of friction cycles, in milligrams (mg).

[0087] All the following tests use the breakage of the polyester filter material base fabric as the friction endpoint:

[0088] Table 1. Total number of friction cycles, wear resistance index, and waterproof / oil-proof properties before and after wear.

[0089] Number of groups Total number of rubs Wear resistance index (rubs / mg) Water and oil repellency Specific Example 1 2100 10.23 1-2 Specific Example 2 2200 10.58 2-3 Specific Example 3 2300 11.09 3 Specific Example 4 2500 12.39 3-4 Specific Example 5 2400 13.21 5

[0090] As can be seen from Table 1 above, the abrasion resistance indices of all specific examples are roughly the same because they have all undergone abrasion treatment. The differences in waterproofing levels are due to the different raw materials in the impregnation solution, resulting in varying waterproofing effects. This is also the focus of this invention. Table 1 illustrates that different additives can guarantee abrasion resistance performance because they have all undergone abrasion treatment. However, the waterproofing performance varies due to the different additives, leading to different interactions between the additives and the abrasion resistance factors, thus causing variations in waterproofing performance. Specific example 5 achieves the best waterproofing performance.

[0091] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating polyester filter media to make it waterproof and wear-resistant, characterized in that: Includes the following steps: Step 1: Preparation of nanoscale silica aerogel Nanoscale SiO2 dispersion was prepared by microemulsion method. 130g of tap water was mixed with 10g of nanoscale silica aerogel powder, 1g of dispersant - OP emulsifier and 2g of co-surfactant - polyvinyl alcohol were added, and the mixture was stirred on a magnetic stirrer for 30min to obtain nanoscale silica aerogel dispersion. Step 2: Preparation of nano-scale silica aerogel / waterproof and oil-proof composite impregnation solution Add 10g of waterproof and oil-repellent agent to the prepared nano-scale silica aerogel dispersion and stir on a magnetic stirrer for 30 min to prepare a nano-scale silica aerogel / waterproof and oil-repellent composite impregnation solution for polyester nonwoven fabric. Step 3: Preparation of needle-punched felt Polyester staple fibers are processed through opening, mixing, fine opening, carding, web formation, addition of polyester base fabric, and needle punching to produce semi-finished needle-punched felt; the unit weight is controlled at 550 g / m². 2 ; Step 4: Filter media treatment The nano-sized silica aerogel / waterproof and oil-proof composite impregnation liquid prepared in step 2 is uniformly dispersed into the semi-finished needle-punched felt in step 3 through an impregnation-pressing process, and a polyester dust removal filter material with high wear resistance and waterproof performance is obtained by heat setting at 190℃.

2. The method for waterproofing and abrasion-resistant treatment of polyester filter material as described in claim 1, characterized in that: It also includes step 5, testing the wear resistance and water and oil resistance of the dust removal filter material prepared in step 4.

3. The method for waterproofing and abrasion-resistant treatment of polyester filter material as described in claim 2, characterized in that: The testing instrument was a Martindale abrasion tester, and the specimen was a circular specimen inside the fixture; The test method is as follows: Under a specified load, the fabric is subjected to friction with an abrasive by planar motion with a trajectory of Lissajious. The sample fixture rotates freely around its axis perpendicular to the horizontal plane, and the abrasion resistance of the fabric is determined by the mass loss method.

4. A polyester filter material prepared by a waterproof and abrasion-resistant treatment method for polyester filter material as described in any one of claims 1 to 3.

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