Special glass fiber air filtering material for gas mask filter and preparation method of special glass fiber air filtering material

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a special glass fiber air filtering material for a gas mask filter and a preparation method thereof. The preparation method of the special glass fiber air filtering material for the gas mask filter comprises the following steps: preparing raw materials, pulping, preparing pulp, carrying out drifting molding, and drying and coiling. The raw materials comprise the following components in parts by weight: 40-50 parts of glass wool with the beating degree of 52-60 degrees SR, 30-40 parts of glass wool with the beating degree of 17-21 degrees SR, 5-15 parts of chopped glass fiber filaments and 5-15 parts of skin-core structure bi-component polyester fibers; the glass fiber air filtering material special for the gas mask filter is efficient, low in resistance, high in strength and free of fluorine, and the preparation method of the glass fiber air filtering material is easy to operate, low in condition temperature and low in cost.

Description

Technical Field

[0001] The invention belongs to the technical field of papermaking, and in particular relates to a special glass fiber air filter material for a gas mask filter and a preparation method thereof. Background Art

[0002] Traditional gas mask filters are mostly made of wood pulp paper or wood pulp plus polyester fiber composite technology, and their filtration accuracy can only reach F7 level (corresponding to EN779 standard), and there is a significant intake resistance problem during the filtration process, which leads to increased breathing resistance. Long-term use can easily cause human fatigue and even affect work safety in special environments. In addition, this type of material has poor moisture resistance and is prone to failure in humid environments, further limiting its application range.

[0003] Although the glass fiber (glass fiber) filter paper currently on the market has excellent filtration efficiency (such as H14 level) and high temperature resistance, its preparation process generally relies on fluorine-containing compounds (such as fluorocarbon water repellents) to improve its waterproof and oil-proof performance. For example, patent CN104060497A uses a composite process of acrylic resin and fluorocarbon water repellent, which improves the filtration efficiency, but long-term contact with fluorine-containing components may pose a potential threat to human health, especially in the use of closed gas masks. This problem is more prominent.

[0004] CN117385675A proposes a high-efficiency, low-resistance, high-waterproof glass fiber air filter material and its preparation method, which includes the following steps: pulping: adding water to a hydraulic pulper, adjusting the pH value with sulfuric acid, adding glass wool with a beating degree of 52-60°SR, glass wool with a beating degree of 45-51°SR, and glass wool with a beating degree of 17-21°SR for pulping; then adding short-cut glass fiber filaments for pulping, and finally making the mass concentration of the raw material in water controlled at 1-3%; pulping: after dispersion, passing through a high-frequency deflaking machine, without cutting, entering a pulping tank, and controlling the pulping concentration at 1-1.5%, a mixed pulp suspension is obtained; after flow forming, drying and winding, paper is obtained. However, the filter material prepared by this method has high resistance, which will cause the filter to breathe unsmoothly, the filter material has a short life, and the dust holding capacity is low; and it contains fluorine, which is harmful to human health.

[0005] Therefore, the problems with the current air boiler materials of gas masks are: the mainstream glass fiber filter paper relies on fluorine-containing modifiers, and long-term use may be harmful to human health; high filtration efficiency is often accompanied by high resistance, making it difficult to balance breathing comfort and protective performance; traditional materials are prone to failure in humid environments, and the mechanical strength is difficult to meet the requirements of folding or high wind pressure.

[0006] Therefore, there is an urgent need to develop a fluorine-free, high-efficiency, low-resistance, high-strength glass fiber filter paper with excellent moisture-proof properties to solve the pain points of using gas masks in special environments and ensure human health and work safety. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned defects existing in the prior art, and provide a special glass fiber air filtration material for gas mask filters, which is efficient, low-resistance, high-strength and fluorine-free. The present invention also provides a preparation method thereof, which is simple in operation, has a suitable temperature condition and low cost.

[0008] The preparation method of the special glass fiber air filtration material for gas mask filters of the present invention includes the following steps: preparing raw materials → pulping → sizing → forming by flow → drying and winding;

[0009] The raw materials, by weight, include the following components: 40-50 parts of glass wool with a beating degree of 52-60°SR, 30-40 parts of glass wool with a beating degree of 17-21°SR, 5-15 parts of chopped glass fiber filaments, and 5-15 parts of core-sheath structured bicomponent polyester fibers;

[0010] The sizing solution used in forming by flow is a mixed solution with a mass ratio of acrylic resin to fluorine-free water and oil repellent of 3.5:1 to 4:1, and the overall sizing amount is 5-8%.

[0011] The length of the chopped glass fiber filaments is 6-9 mm, and the diameter is 6-9 μm.

[0012] The specific steps of pulping are as follows: add clear water into a hydrapulper, adjust the pH to 2.55±0.25, first add glass wool with a beating degree of 52-60°SR and glass wool with a beating degree of 17-21°SR, and pulp for 2-5 minutes, then add chopped glass fiber filaments and pulp for 1-2 minutes, and finally add core-sheath structured bicomponent polyester fibers. After pulping, the mass concentration of fibers in water is 1-3%.

[0013] In sizing, the pulp after pulping is passed through a high-frequency refiner without knife setting for sizing, and the sizing concentration is controlled at 1-2%.

[0014] The specific steps of forming by flow are as follows: pump the prepared mixed pulp suspension to a inclined wire paper machine for papermaking and dewatering at a concentration of 0.4-1.0‰, form on a forming wire, then pass through a transfer wire through a sizing machine, and apply sizing on the transfer wire by the way of showering, and the sizing pH value is controlled at 8-11.

[0015] The acrylic resin is KH-6266 (Shandong Kunhan New Material Technology Co., Ltd.), and the fluorine-free water and oil repellent is XF5007 (Daikin Fluorochemicals (China) Co., Ltd.).

[0016] The specific steps of drying and winding are as follows: dry the sized wet paper sheet through a drying cylinder to finally obtain a finished paper.

[0017] Among them, the drying of the dryer cylinder is divided into three sections. The steam pressure in the high-temperature section A is 450 ± 50 Kpa, the steam pressure in the high-temperature section B is 700 ± 50 Kpa, and the steam pressure in the high-temperature section C is 700 ± 50 kPa. The basis weight of the paper is between 70 - 76 g / m 2 of the finished paper, and the production speed is controlled at 103 ± 3 m / min.

[0018] Specifically, the preparation method of the special fiberglass air filtration material for gas mask filters includes the following steps:

[0019] (1) Stock preparation: Prepare 40 - 50 parts of glass wool with a beating degree of 52 - 60°SR, 30 - 40 parts of glass wool with a beating degree of 17 - 21°SR, 5 - 15 parts of chopped glass fiber filaments with a chopped length of 6 - 9 mm and a diameter of 6 - 9 μm; 5 - 15 parts of core-sheath structured bicomponent polyester fiber;

[0020] (2) Pulping: Add clear water to a hydraulic pulper, adjust the pH value to 2.55 ± 0.25 with sulfuric acid, add glass wool with a beating degree of 52 - 60°SR and glass wool with a beating degree of 17 - 21°SR, and disintegrate for 2 - 5 min; then add chopped glass fiber filaments with a chopped length of 6 - 9 mm and a diameter of 6 - 9 μm, and disintegrate for 1 - 2 min. Finally, add core-sheath structured bicomponent polyester fiber, and finally control the mass concentration of the fiber in water at 1 - 3%;

[0021] (3) Slurry blending: After dispersion, uniformly pass through a high-frequency refiner without adjusting the knives, and enter the slurry blending tank. The slurry blending concentration is controlled at 1 - 2%;

[0022] (4) Flow-feeding and forming: Pump the mixed slurry suspension to a inclined wire paper machine for papermaking and dewatering at a concentration of 0.4 - 1.0‰, form on the forming wire, then pass through a transfer wire through a sizing machine, and size on the transfer wire by means of spraying glue. The sizing pH value is controlled between 8 - 11; among them, the sizing solution is composed of acrylic resin KH-6266 and fluorine-free water and oil repellent XF5007. The mass ratio of acrylic resin to fluorine-free water and oil repellent is 3.5:1 - 4:1, and the overall sizing amount is controlled at 5 - 8%;

[0023] (5) Flow-feeding and forming and winding: The sized wet paper sheet is finally dried by a dryer cylinder to obtain the finished paper. Among them, the drying of the dryer cylinder is divided into three sections. The steam pressure in the high-temperature section A is 450 ± 50 kPa, the steam pressure in the high-temperature section B is 700 ± 50 kPa, and the steam pressure in the high-temperature section C is 700 ± 50 kPa; the basis weight of the paper is between 70 - 76 g / m 2 of the finished paper, and the production speed is controlled at 103 ± 3 m / min, and finally the special fiberglass air filtration material for gas mask filters is obtained.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] (1) The preparation method of the special glass fiber air filtration material for the gas mask filter of the present invention uses a compound sizing solution of a fluorine-free water and oil repellent XF5007 and an acrylic resin KH-6266, completely abandoning the process that relies on fluorine-containing compounds in traditional glass fiber filter paper, and eliminating the potential harm of fluorine elements to the human respiratory system from the source. At the same time, by precisely controlling the sizing pH value and the sizing amount, the filter paper is given excellent water and oil repellent properties, and can still maintain the stiffness and filtration efficiency of the filter material in a humid environment, avoiding problems such as increased resistance or structural collapse caused by moisture absorption.

[0026] (2) The preparation method of the special glass fiber air filtration material for the gas mask filter of the present invention combines glass wool with two different beating degrees, combines chopped glass fiber filaments with core-sheath structured bicomponent polyester fibers to construct a multi-scale gradient pore structure. Among them, the high-beating-degree fibers provide a dense interception layer, the low-beating-degree fibers form a skeleton support, and the chopped fibers and polyester fibers enhance the fiber interweaving strength, achieving the effects of high filtration accuracy and low initial resistance, and solving the contradiction of low efficiency and high resistance of traditional wood pulp filter paper.

[0027] (3) The preparation method of the special glass fiber air filtration material for the gas mask filter of the present invention first disintegrates the glass wool, then adds chopped fibers and polyester fibers, combines a three-stage drying cylinder drying process and repeated folding operations without powder falling off. In addition, due to the difference in the melting point of the core layer and the softening point of the skin layer of the core-sheath polyester fiber, local hot melt bonding points are formed during the drying process, further strengthening the fiber network and ensuring that the filter paper does not deform or collapse during long-term use.

[0028] (4) The preparation method of the special glass fiber air filtration material for the gas mask filter of the present invention optimizes the size of the chopped glass fiber filaments and the forming process of the inclined wire paper machine, so that a uniform microporous structure is formed on the surface of the filter paper, the dust holding capacity is increased, and it is more than 66% higher than that of traditional glass fiber filter paper. Combined with the continuous control of the production speed, the replacement cycle of the filter element can be significantly extended, ensuring the continuous safety protection of operators in special environments. Specific Embodiments

[0029] The present invention will be further described below in conjunction with specific embodiments.

[0030] The raw materials and auxiliaries used in the following examples and comparative examples are all commercially available products. The high-temperature section A, high-temperature section B, and high-temperature section C in step (5) are all settings of existing drying devices. The temperature of the high-temperature section A is controlled at 100 ± 10 °C, the temperature of the high-temperature section B is controlled at 150 ± 10 °C, and the temperature of the high-temperature section C is controlled at 160 ± 10 °C.

[0031] Example 1

[0032] The preparation method of the special glass fiber air filtration material for the gas mask filter includes the following steps:

[0033] (1) Stock preparation: Prepare 40 parts of glass wool with a beating degree of 52 - 60°SR, 40 parts of glass wool with a beating degree of 17 - 21°SR, 15 parts of chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm; 5 parts of core - sheath structure bicomponent polyester fiber;

[0034] (2) Pulping: Add clear water into a hydrapulper, adjust the pH value to 2.55 with sulfuric acid, add the glass wool with a beating degree of 52 - 60°SR and the glass wool with a beating degree of 17 - 21°SR, and pulping for 3 min; then add the chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm, and pulping for 1 min, and finally add the core - sheath structure bicomponent polyester fiber. Finally, control the mass concentration of the fiber in water at 1.5%;

[0035] (3) Slurry blending: After dispersion, uniformly pass through a high - frequency refiner without knife setting, and enter the slurry blending tank, and control the blending concentration at 1%;

[0036] (4) Flow - forming: Pump the mixed slurry suspension to a inclined - wire paper machine for papermaking and dewatering at a concentration of 0.4‰, form on the forming wire, then pass through a transfer wire through a sizing machine, and apply sizing on the transfer wire by the way of glue pouring, and control the sizing pH value at 10; the sizing solution is composed of acrylic resin KH - 6266 (Shandong Kunhan New Material Technology Co., Ltd.) and fluorine - free water - and oil - repellent agent XF5007 (Daikin Fluorochemicals (China) Co., Ltd.), and the mass ratio of acrylic resin to fluorine - free water - and oil - repellent agent is 3.5:1, and the overall sizing amount is controlled at 6%;

[0037] (5) Drying and winding: The sized wet paper sheet is dried by a drying cylinder to finally obtain the finished paper. The drying of the drying cylinder is divided into three sections. The steam pressure of the high - temperature section A is 450 kPa, the steam pressure of the high - temperature section B is 700 kPa, and the steam pressure of the high - temperature section C is 750 kPa; the basis weight of the paper is 74 g / m 2 of the finished paper, control the production speed at 103 m / min, and finally obtain the special glass fiber air - filtering material for gas - mask filters.

[0038] Example 2

[0039] The preparation method of the special glass fiber air - filtering material for gas - mask filters includes the following steps:

[0040] (1) Stock preparation: Prepare 45 parts of glass wool with a beating degree of 52 - 60°SR, 35 parts of glass wool with a beating degree of 17 - 21°SR, 10 parts of chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm; 10 parts of core - sheath structure bicomponent polyester fiber;

[0041] (2) Pulping: Add clear water into a hydrapulper, adjust the pH value to 2.65 with sulfuric acid, add glass wool with beating degree of 52 - 60°SR and glass wool with beating degree of 17 - 21°SR, and disintegrate for 2 min; then add chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm, and disintegrate for 1.5 min. Finally, add core - sheath structured bicomponent polyester fiber. Eventually, control the mass concentration of fibers in water at 2%;

[0042] (3) Stock preparation: After dispersion, uniformly pass through a high - frequency refiner without adjusting the knives, and enter the stock preparation tank. Control the stock preparation concentration at 1.5%;

[0043] (4) Flow - forming: Pump the mixed pulp suspension to a inclined - wire paper machine for papermaking and dewatering at a concentration of 0.6‰, form it on the forming wire, then pass through a transfer wire and a sizing machine, and apply sizing on the transfer wire by the way of pouring glue. Control the sizing pH value at 9; The sizing solution is composed of acrylic resin KH - 6266 (Shandong Kunhan New Material Technology Co., Ltd.) and fluorine - free water - and oil - repellent agent XF5007 (Daikin Fluorochemicals (China) Co., Ltd.). The mass ratio of acrylic resin to fluorine - free water - and oil - repellent agent is 3.5:1, and the overall sizing amount is controlled at 7%;

[0044] (5) Drying and winding: The sized wet paper sheet is dried by drying cylinders to finally obtain the finished paper. The drying by drying cylinders is divided into three sections. The steam pressure in the high - temperature section A is 500 kPa, the steam pressure in the high - temperature section B is 720 kPa, and the steam pressure in the high - temperature section C is 750 kPa; The basis weight of the paper is 75 g / m 2 of the finished paper. Control the production speed at 104 m / min, and finally obtain the special glass fiber air - filtering material for gas - mask filters.

[0045] Example 3

[0046] The preparation method of the special glass fiber air - filtering material for gas - mask filters includes the following steps:

[0047] (1) Stock preparation: Prepare 50 parts of glass wool with beating degree of 52 - 60°SR, 30 parts of glass wool with beating degree of 17 - 21°SR, 5 parts of chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm; 15 parts of core - sheath structured bicomponent polyester fiber;

[0048] (2) Pulping: Add clear water into a hydrapulper, adjust the pH value to 2.5 with sulfuric acid, add glass wool with beating degree of 52 - 60°SR and glass wool with beating degree of 17 - 21°SR, and disintegrate for 4 min; then add chopped glass fiber filaments with a chopped length of 6 mm and a diameter of 6 μm, and disintegrate for 2 min. Finally, add core - sheath structured bicomponent polyester fiber. Eventually, control the mass concentration of fibers in water at 3%;

[0049] (3) Pulp blending: After dispersion, it uniformly passes through a high-frequency refiner without knife setting and enters the pulp blending tank, with the pulp blending concentration controlled at 2%.

[0050] (4) Flow forming: The mixed pulp suspension is pumped to a inclined wire paper machine for papermaking and dehydration at a concentration of 0.6‰, forms on the forming wire, then passes through a sizing machine through a transfer wire, and sizing is carried out on the transfer wire by means of gluing, with the sizing pH value being 10; among them, the sizing solution is composed of acrylic resin KH-6266 (Shandong Kunhan New Material Technology Co., Ltd.) and fluorine-free water and oil repellent XF5007 (Daikin Fluorochemicals (China) Co., Ltd.), and the mass ratio of acrylic resin to fluorine-free water and oil repellent is 3.5:1, and the overall sizing amount is controlled at 8%.

[0051] (5) Drying and coiling: The sized wet paper sheet is dried by a dryer to finally obtain the finished paper. Among them, the dryer drying is divided into three sections, with the steam pressure of the high-temperature section A being 500 kPa, the steam pressure of the high-temperature section B being 750 kPa, and the steam pressure of the high-temperature section C being 750 kPa; among them, the basis weight of the paper is 73 g / m 2 of the finished paper, the production speed is controlled at 106 m / min, and finally a special glass fiber air filtration material for gas mask filters is obtained.

[0052] Comparative Example 1

[0053] Others are the same as those in Example 1, the difference is that: glass wool with 52 - 60° SR is not used.

[0054] Comparative Example 2

[0055] Others are the same as those in Example 1, the difference is that: chopped glass fiber filaments are not added.

[0056] Comparative Example 3

[0057] Others are the same as those in Example 1, the difference is that: core-sheath structure bicomponent polyester fibers are not added.

[0058] The products prepared in Examples 1 - 3 and Comparative Examples 1 - 3 are tested, and the results are shown in Table 1. The resistance and efficiency are in accordance with the EN1822-2009 standard, and the test equipment is TSI8130A. The stiffness detection is carried out with a CF-520 Gurley stiffness tester, and the applicable standards are as follows: TAPPI T543-1994, IEST-RP-CCO21.2(2005) "HEPA and ULPA Filter Media Tests", CRAA 433 "Test Methods for Air Filter Paper Performance", the water absorption is detected according to GB4744-1997 using a hydrostatic pressure tester, and the longitudinal and transverse tensile strengths are detected according to GB / T12914-2008 using a tensile strength tester.

[0059] Table 1 Test Results

[0060]

Claims

1. A preparation method of a special glass fiber air filtration material for a gas mask filter, characterized in that, The following steps are involved: Prepare raw materials → crush pulp → mix pulp → flow forming → dry and coil; The raw materials include the following components by weight: 40-50 parts of glass wool with a beating degree of 52-60°SR, 30-40 parts of glass wool with a beating degree of 17-21°SR, 5-15 parts of chopped glass fiber, and 5-15 parts of bicomponent polyester fiber with a core-skin structure; The sizing liquid used in flow forming is a mixture of acrylic resin and fluorine-free waterproof and oil-proof agent in a mass ratio of 3.5:1 to 4:1, and the overall glue coating amount is 5-8%.

2. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 1, characterized in that, The length of the chopped glass fiber filaments is 6 to 9 mm, and the diameter is 6 to 9 μm.

3. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 1, characterized in that, The specific steps of pulping are as follows: add clean water to the hydraulic pulper, adjust the pH to 2.55±0.25, first add glass wool with a beating degree of 52-60°SR and glass wool with a beating degree of 17-21°SR, and pulp for 2-5 minutes, then add short-cut glass fiber filaments, and pulp for 1-2 minutes, and finally add the core-skin structured two-component polyester fiber.

4. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 3, characterized in that, The pulp is then pulverized to a concentration of 1-3% by mass of the fibers in water.

5. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 1, characterized in that In the pulping process, the pulp after pulping is passed through a high-frequency deflaking machine without cutting, and the pulping concentration is controlled at 1-2%.

6. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 1, characterized in that, The specific steps of flow forming are: pump the prepared mixed pulp suspension to the inclined wire paper machine at a concentration of 0.4-1.0‰ for papermaking and dehydration, form it on the forming net, and then pass it through the transfer net through the sizing machine, and apply glue on the transfer net by spraying glue, and the pH value of the glue is controlled at 8-11.

7. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 6, characterized in that, The acrylic resin is KH-6266, and the fluorine-free waterproof and oil-proof agent is XF5007.

8. The preparation method of the special glass fiber air filtration material for the gas mask filter according to claim 7, characterized in that, The specific steps of drying and winding are: the wet paper sheets after gluing are dried in a drying cylinder to finally obtain the finished paper.

9. The preparation method of the special glass fiber air filtration material for gas mask filters according to claim 8, characterized in that, The drying of the dryer cylinder is divided into three sections. The steam pressure in the high-temperature section A is 450 ± 50 kPa, the steam pressure in the high-temperature section B is 700 ± 50 kPa, and the steam pressure in the high-temperature section C is 700 ± 50 kPa. Among them, the basis weight of the paper is controlled at 70 - 76 g / m 2 of the finished paper, and the production speed is controlled at 103 ± 3 m / min.

10. A special glass fiber air filtration material for gas mask filters, characterized in that, The invention is prepared by the preparation method of the special glass fiber air filter material for gas mask filter according to any one of claims 1 to 9.

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