A method for preparing a non-woven aldehyde-removing material loaded with 3D active manganese

Abstract

The application relates to the technical field of air purification materials, and specifically discloses a preparation method of a non-woven fabric aldehyde removal material loaded with 3D active manganese, which comprises the following steps: mixed slurry preparation, composite loading, 3D construction, encapsulation and drying molding; wherein the 3D construction step is: pre-drying the material after composite loading at 65-75 DEG C for 20-30 s; then performing upper layer weak purging for 15-25 s, while performing lower layer strong purging for 20-30 s; the upper and lower layer purging forms a temperature difference of 15-20 DEG C and a wind speed difference of 0.5-1.0 m / s; finally, after being solidified in the middle zone at 85-95 DEG C for 35-55 s, drying at 90-100 DEG C until the water content is less than or equal to 3%. The preparation method provided by the application can obtain the non-woven fabric aldehyde removal material loaded with 3D active manganese, which has a manganese loading capacity of greater than or equal to 11000 mg / kg and a manganese shedding rate of less than or equal to 0.02%, can efficiently decompose formaldehyde, and has good safety and environmental protection.

Description

Technical Field

[0001] This application relates to the field of air purification materials technology, specifically to a method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese. Background Technology

[0002] Formaldehyde removal technologies mainly include physical adsorption and chemical catalytic decomposition technologies. Traditional physical adsorption has drawbacks such as easy saturation, easy desorption, and secondary release, making it difficult to achieve complete purification of formaldehyde. On the other hand, chemical catalytic decomposition can completely mineralize formaldehyde into carbon dioxide and water, and has the advantages of high purification efficiency, strong safety, and long service life. It has now become the mainstream formaldehyde removal method.

[0003] Manganese dioxide is considered an ideal formaldehyde decomposition catalyst due to its advantages such as high catalytic activity at low temperatures, low toxicity, and low cost. However, current research on manganese dioxide mainly focuses on optimizing the nanostructure morphology and is generally still in the laboratory stage, making large-scale industrialization difficult. In addition, most existing commercially available formaldehyde removal products are black activated manganese felts, which have defects such as easy shedding and powdering of nano-activated manganese, poor safety, low loading capacity, and low catalytic efficiency, failing to meet the market demand for safe, efficient, and mass-producible products.

[0004] Therefore, developing a high-load, non-powder-shedding, stable and reliable active manganese formaldehyde catalytic decomposition material and its industrial preparation process is of great significance for formaldehyde control. Summary of the Invention

[0005] In order to overcome the problems of easy powder shedding, low loading capacity, and difficulty in industrialization of existing active manganese formaldehyde removal materials, this application provides a method for preparing a non-woven formaldehyde removal material loaded with 3D active manganese.

[0006] In a first aspect, this application provides a method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese, using the following technical solution: A method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese includes the following steps: preparation of mixed slurry, composite loading, 3D construction, encapsulation and drying molding; The composite loading step is as follows: the nonwoven fabric is impregnated in a mixed slurry with a solid content of 2-3%, followed by high-temperature rotary evaporation; the pressure during the impregnation process is 0.18-0.22 MPa, and the roll-off rate is 65-75%; The 3D construction steps are as follows: the composite loaded material is pre-baked at 65-75℃ for 20-30s; then, the upper layer is weakly purged at 80-90℃ and wind speed of 0.8-1.2m / s for 15-25s, while the lower layer is strongly purged at 95-105℃ and wind speed of 1.5-2.2m / s for 20-30s; the purging of the upper and lower layers creates a temperature difference of 15-20℃ and a wind speed difference of 0.5-1.0m / s, causing active manganese to migrate and accumulate in the middle layer; finally, after curing in the middle zone at 85-95℃ for 35-55s, it is dried at 90-100℃ until the moisture content is ≤3%, thus completing the 3D construction.

[0007] This application prepares a nonwoven fabric formaldehyde removal material loaded with 3D active manganese through steps such as mixed slurry preparation, composite loading, 3D construction, encapsulation, and drying. These steps synergistically regulate the uniformity of active manganese loading and the stability of material molding, enabling the nonwoven fabric formaldehyde removal material to achieve high catalytic efficiency, high safety in use, and high industrialization consistency, showing great application prospects. Specifically, in the composite loading stage, the amount of slurry carried per unit area of ​​nonwoven fabric is controlled by impregnation under specific pressure and roll-off rate, ensuring uniform and controllable active manganese loading. Simultaneously, rapid dehydration and fixation through high-temperature rotary evaporation significantly improves catalyst adhesion and fixation efficiency, avoiding problems such as slurry flow and uneven distribution, laying the foundation for subsequent high loading and stable catalysis. In the 3D construction stage, free water on the material surface is removed by pre-baking to prevent uncontrolled catalyst migration. Then, the temperature and wind speed differences created by the weak purging of the upper layer and the strong purging of the lower layer construct a top-down directional driving force field within the nonwoven fabric, causing active manganese particles to migrate and accumulate in the middle layer, forming a clean surface and a high-load 3D structure. This distribution and structure fundamentally solves the problems of powder shedding, detachment, and high contact risk inherent in traditional formaldehyde removal materials. Finally, curing and drying in the middle zone slowly anchors the adhesive, further enhancing the bonding strength of the active manganese and ensuring structural stability and dimensional stability. In summary, the nonwoven formaldehyde removal material preparation method provided in this application produces a formaldehyde removal material with advantages such as high loading capacity, high catalytic activity, high air permeability, low detachment rate, and high safety. Its catalytic performance is long-lasting and stable, suitable for various scenarios such as fresh air systems, vehicle-mounted systems, and indoor purification, and can achieve continuous, large-scale, and stable production.

[0008] In the 3D construction stage of this application, the mechanism by which active manganese particles migrate and accumulate in the intermediate layer is as follows: A weak upper layer and a strong lower layer create a downward-moving directional airflow thrust and pressure gradient field. The strong lower airflow carries the active manganese particles from the wet slurry upwards, while the weak upper airflow acts as a surface dryer and confinement agent, preventing penetration thrust and thus preventing particles from reaching the top layer. Instead, particles accumulate in the intermediate region where the forces of the upper and lower airflows converge. Simultaneously, the high temperature in the lower layer accelerates moisture vaporization, generating an outward vapor diffusion force that further propels the particles towards the center. The relatively low temperature in the upper layer allows for rapid pre-curing of the surface fibers and binder, forming a barrier layer that prevents particles from continuing to move towards the surface. In other words, under the synergistic effect of airflow drag, pressure gradient, vapor diffusion, and surface barrier, active manganese particles are stably confined and enriched in the nonwoven fabric intermediate layer, ultimately forming a three-dimensional structure with a clean surface and a high load in the middle. This ensures both high loading and catalytic activity while fundamentally solving the problems of powder shedding and detachment.

[0009] Optionally, the solid content of the mixed slurry is 2.5%, the pressure during the rolling process is 0.20 MPa, and the roll residue is 70%.

[0010] Optionally, the mixed slurry contains δ-active manganese and adhesive.

[0011] Optionally, the weight ratio of the δ-active manganese to the adhesive is (7.5-11):1.

[0012] In this application, the weight ratio of δ-active manganese to adhesive affects the content of effective catalytic components in the material and the anchoring and bonding strength of particles in the nonwoven fabric, thus simultaneously affecting the manganese loading and powder shedding rate. When the proportion of active manganese is too high and the adhesive is insufficient, there are insufficient bonding points and anchoring forces between particles. Although this can increase the manganese loading in the nonwoven fabric, it will lead to weak particle bonding and a significant decrease in interfacial adhesion. During airflow scouring and use, powder shedding and detachment are very likely to occur, resulting in a significant increase in the powder shedding rate. When the proportion of adhesive is too high and the active manganese is insufficient, although the bonding strength is sufficient and the powder shedding rate is low, it will cause the effective content of the catalyst to be diluted. Under the same process conditions, the manganese loading will be significantly reduced. At the same time, excessive adhesive can easily encapsulate particles and block the micropores of the nonwoven fabric, reducing the material's air permeability and catalytic activity. Therefore, by controlling the weight ratio of δ-active manganese to adhesive within the above-mentioned range, this application can achieve a balance between high manganese loading and low manganese powder shedding rate, enabling the non-woven formaldehyde removal material to have comprehensive performance of high manganese loading, low shedding rate, high catalytic efficiency, and high air permeability.

[0013] In some embodiments, the weight ratio of the δ-active manganese to the adhesive is (7.5-9):1, (7.5-10):1, (7.5-11):1, (9-10):1, (9-11):1, or (10-11):1.

[0014] In one specific embodiment, the weight ratio of the δ-active manganese to the adhesive is 7.5:1, 9:1, 10:1, or 11:1.

[0015] Optionally, in the composite loading step, the high-temperature rotary evaporation temperature is 60-75℃.

[0016] Optionally, the encapsulation is performed using a mesh dispensing encapsulation method.

[0017] Optionally, the drying and molding process is as follows: pre-curing at 70-80℃ for 10-15 seconds, drying at 85-95℃ for 40-60 seconds, and drying at 90-100℃ for 20-30 seconds.

[0018] Secondly, this application provides a nonwoven formaldehyde removal material loaded with 3D active manganese, which is prepared by the method described above.

[0019] Optionally, the nonwoven formaldehyde removal material loaded with 3D active manganese has a manganese loading of ≥11000 mg / kg and a manganese shedding rate of ≤0.02%.

[0020] In summary, this application has the following beneficial effects: This application provides a method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese, including steps of mixed slurry preparation, composite loading, 3D construction, encapsulation and drying molding. By adjusting the solid content of the mixed slurry, the pressure and roll-off rate in the composite loading step, and the temperature and wind speed of the upper and lower layers in the 3D construction step, a nonwoven formaldehyde removal material loaded with 3D active manganese with a manganese loading of ≥11000 mg / kg and a manganese shedding rate of ≤0.02% is obtained. This material has the characteristics of high loading, low shedding rate and high safety, and can be adapted to various scenarios such as fresh air, vehicle, and indoor purification, and can achieve continuous, large-scale and stable production. Attached Figure Description

[0021] Figure 1 This is a flowchart of the preparation method of the nonwoven formaldehyde removal material loaded with 3D active manganese provided in this application;

[0022] Figure 2 This is a scanning electron microscope image of the nonwoven formaldehyde removal material loaded with 3D active manganese provided in this application. Detailed Implementation

[0023] This application provides a method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese, comprising the following steps: (1) Preparation of mixed slurry: Mix δ-active manganese with glue at a mass ratio of (7.5-11):1, then add deionized water to prepare a slurry with a solid content of 2-3%, disperse and homogenize at high speed at 800-1000r / min for 30-60min, and then degas under vacuum to obtain mixed slurry; (2) Composite loading: The nonwoven fabric is subjected to double-roll impregnation in an impregnation mill containing mixed slurry at a pressure of 0.18-0.22 MPa and a roll-off rate of 65-75%; then it is dehydrated by high-speed rotary evaporation process, with the rotary evaporation temperature controlled at 60-75℃, thereby achieving loading of active manganese on the surface of the nonwoven fabric and obtaining composite material. (3) 3D construction: The composite carrier is sent into a gradient hot air oven and pre-dried at 65-75℃ for 20-30s. Then, the upper layer is weakly purged at 80-90℃ and wind speed of 0.8-1.2m / s for 15-25s, while the lower layer is strongly purged at 95-105℃ and wind speed of 1.5-2.2m / s for 20-30s. The purging of the upper and lower layers creates a temperature difference of 15-20℃ and a wind speed difference of 0.5-1.0m / s, which causes active manganese to migrate and accumulate in the middle layer. Finally, after curing in the middle zone at 85-95℃ for 35-55s, it is dried at 90-100℃ until the moisture content is ≤3%, thus completing the 3D construction.

[0024] (4) Encapsulation and Drying: The 3D constructed composite material is fed into a mesh dispensing machine with a tension controlled at 40-60N. Roller dot matrix dispensing is used, with a dot diameter of 0.3-0.6 mm and a dot density of 30-50 mesh / cm. 2 The amount of adhesive applied is 0.8-1.2 g / m. 2 The product is pre-cured at 70-80℃ for 10-15 seconds, dried at 85-95℃ for 40-60 seconds, and dried at 90-100℃ for 20-30 seconds to achieve a moisture content of ≤3%. After ultrasonic cutting at 20-30kHz, a non-woven formaldehyde removal material loaded with 3D active manganese is obtained.

[0025] In the embodiments of this application, δ-active manganese is a self-made product of our company; the adhesive is an acrylic adhesive with a viscosity of 400 mPa·s; the nonwoven fabric is a three-layer fully cross-linked PET / PP composite nonwoven fabric with a viscosity of 60 g / m². 2 Thickness 0.22-0.28 mm, average pore size 15-30 μm, air permeability ≥3500 L / (m³) 2 ·s); The raw materials, reagents, solvents, etc. used in this application can all be obtained commercially.

[0026] The present application will be further described in detail below with reference to embodiments, performance testing tests and accompanying drawings.

[0027] Example 1

[0028] Example 1 provides a nonwoven fabric formaldehyde removal material loaded with 3D active manganese, the preparation method of which includes the following steps: (1) Preparation of mixed slurry: δ-active manganese and acrylic glue are mixed at a mass ratio of 9:1, and then deionized water is added to prepare a slurry with a solid content of 2.5%. The slurry is dispersed and homogenized at 1000 r / min for 30 min and then degassed under vacuum to obtain the mixed slurry. (2) Composite loading: The nonwoven fabric is subjected to double-roll impregnation in an impregnation mill containing mixed slurry at a pressure of 0.2 MPa and a roll-off rate of 70% (i.e., the design load is 15343 mg / kg); then it is dehydrated by high-speed rotary evaporation process, and the rotary evaporation temperature is controlled at 70℃, so as to achieve the loading of active manganese on the surface of the nonwoven fabric and obtain composite material. (3) 3D construction: The material after composite carrier is sent into gradient hot air oven and pre-dried at 65℃ for 30s. Then, the upper layer is weakly purged at 85℃ and wind speed of 1.0m / s for 20s, while the lower layer is strongly purged at 100℃ and wind speed of 1.8m / s for 25s. The purging of the upper and lower layers forms a temperature difference of 15℃ and a wind speed difference of 0.8m / s, which causes active manganese to migrate and accumulate in the middle layer. Finally, after curing in the middle zone at 90℃ for 40s, it is dried at 100℃ to a moisture content of 2.5%, thus completing the 3D construction.

[0029] (4) Encapsulation and Drying: The 3D constructed composite material is fed into a mesh dispensing machine with a tension of 50 N. Roller dot matrix dispensing is used with a dot diameter of 0.4 mm and a dot density of 40 mesh / cm. 2 The amount of adhesive applied is 1.0g / m². 2 The product is pre-cured at 75℃ for 13 seconds, dried at 90℃ for 50 seconds, and dried at 95℃ for 30 seconds to achieve a moisture content of 2.0%. After ultrasonic cutting at 25kHz, a non-woven formaldehyde removal material loaded with 3D active manganese is obtained.

[0030] Example 2-3

[0031] Examples 2-3 provide a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0032] The difference between the above embodiment and Embodiment 1 lies in the design load, as follows: In Example 2, the solid content of the mixed slurry was 2%, the pressure of the two-roll impregnation was 0.18 MPa, and the roll residue was 65% (i.e., the design load was 11430 mg / kg).

[0033] In Example 3, the solid content of the mixed slurry was 3%, the pressure of the two-roll impregnation was 0.22 MPa, and the roll residue was 75% (i.e., the design load was 19845 mg / kg).

[0034] Examples 4-7

[0035] Examples 4-7 provide a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0036] The difference between the above embodiments and Embodiment 1 is that the process parameters in the 3D construction steps are shown in Table 1 below.

[0037] Table 1. Process parameters in the 3D construction steps of Examples 1, 4-7, and Comparative Examples 2-5

[0038] Example 8

[0039] Example 8 provides a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0040] The difference between the above embodiment and Embodiment 1 is that the weight ratio of δ-active manganese to acrylate adhesive is 7.5:1, that is, the designed loading is 15150mg / kg.

[0041] Example 9

[0042] Example 9 provides a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0043] The difference between the above embodiment and Example 1 is that the weight ratio of δ-active manganese to acrylate adhesive is 10:1, that is, the designed loading is 15600mg / kg.

[0044] Example 10

[0045] Example 10 provides a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0046] The difference between the above embodiment and Embodiment 1 is that the weight ratio of δ-active manganese to acrylate adhesive is 11:1, that is, the designed loading is 15730mg / kg.

[0047] Comparative Example 1

[0048] Comparative Example 1 provides a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0049] The difference between the above comparative example and Example 1 is that the solid content of the mixed slurry in Comparative Example 2 is 4%, the pressure of the two-roll impregnation is 0.3 MPa, and the roll residue is 70% (i.e., the design load is 24696 mg / kg).

[0050] Comparative Examples 2-5

[0051] Comparative Examples 2-5 each provide a nonwoven formaldehyde removal material loaded with 3D active manganese.

[0052] The difference between the above comparative example and Example 1 is that the process parameters in the 3D construction step are shown in Table 1.

[0053] Performance testing

[0054] The manganese loading and manganese shedding rate of the nonwoven formaldehyde removal materials provided in Examples 1-10 and Comparative Examples 1-5 were tested, and the results are shown in Table 2 below.

[0055] (1) Manganese loading: Cut the non-woven formaldehyde removal material into 10mm×10mm test samples, accurately weigh the sample mass and record it; then use inductively coupled plasma atomic emission spectrometry to determine the mass of manganese in the test sample and calculate the actual manganese loading.

[0056] (2) Manganese shedding rate: The non-woven formaldehyde removal material was cut into test samples of 10cm×10cm and then placed in a standard wind tunnel device. It was continuously blown for 1h at a wind speed of 1.0m / s. The mass of manganese in the shedding material after blowing was collected and the manganese shedding rate was calculated. The calculation formula is: manganese shedding rate = (mass of manganese in the shedding material / total mass of manganese in the test sample) × 100%.

[0057] (3) Formaldehyde removal effect: The non-woven formaldehyde removal material was cut into test samples with a diameter of 10cm using a grammage meter; the test samples were placed in the purifier, and then placed together with the formaldehyde detector (British PPM-htv) in a 100L test chamber filled with formaldehyde gas; the initial formaldehyde concentration and the formaldehyde concentration after 30 minutes in the test chamber were detected, and the formaldehyde removal rate was calculated based on the test results; Formaldehyde removal rate = (initial formaldehyde concentration - formaldehyde concentration after 30 minutes) / initial formaldehyde concentration × 100%.

[0058] Table 2 Performance test results of the nonwoven formaldehyde removal materials provided in Examples 1-10 and Comparative Examples 1-5

[0059] The inspection results of Examples 1-3 and Comparative Example 1 show that the actual manganese loading increases with the increase of slurry solid content, padding pressure, and roll residue, while the dust loss rate also increases. In particular, the manganese loading of the nonwoven formaldehyde removal material obtained in Comparative Example 1 is too high, resulting in severe surface accumulation and a sharp increase in the manganese shedding rate to 0.116%. Therefore, it is shown that excessive loading will destroy the anchoring structure of manganese on the surface of the nonwoven fabric, significantly increasing the risk of dust loss and resulting in poor environmental protection and safety.

[0060] The test results of Examples 1, 4-7, and Comparative Examples 2-5 show that in the 3D construction steps of Examples 1 and 4-7, controlling the temperature difference between the upper and lower layers during purging to 15-20℃ and the wind speed difference to 0.5-1.0 m / s ensures that the manganese shedding rate of the non-woven formaldehyde removal material is ≤0.02%. However, the pre-baking temperature in Comparative Example 2 was too low, and the pre-baking temperature in Comparative Example 3 was too high, both leading to uncontrolled moisture migration and curing rhythm, and uneven particle distribution, resulting in manganese shedding rates of 0.063% and 0.079%, respectively. In Comparative Example 4, the absence of temperature and wind speed differences in the 3D construction step resulted in particles failing to accumulate in the middle layer, with a higher concentration on the surface, leading to a manganese shedding rate of 0.094%. In Comparative Example 5, the wind speed and temperature exceeded reasonable ranges in the 3D construction step, causing localized over-drying or excessive impact, resulting in a manganese shedding rate as high as 0.102%. Therefore, this application demonstrates that by controlling the temperature of the upper weak purging layer to 80-90℃ and the wind speed to 0.8-1.2m / s, and the temperature of the lower strong purging layer to 95-105℃ and the wind speed to 1.5-2.2m / s, with a temperature difference of 15-20℃ and a wind speed difference of 0.5-1.0m / s, manganese can be enriched in the middle layer, reducing the manganese shedding rate, thereby ensuring the safety and effectiveness of the non-woven formaldehyde removal material.

[0061] The test results of Examples 1 and 8-10 show that the ratio of δ-active manganese to acrylate adhesive affects the bonding and anchoring strength of manganese in nonwoven fabrics and the actual load of manganese. In Example 10, the manganese ratio was too high and the adhesive ratio was too low, resulting in insufficient bonding points and a manganese shedding rate of 0.019%. Therefore, this application demonstrates that by further controlling the weight ratio of δ-active manganese to adhesive within the range of (7.5-10), the manganese shedding rate can be reduced to below 0.015%.

[0062] In summary, by optimizing parameters such as composite loading, 3D construction, and slurry mixing ratio, this application can stably control the actual manganese loading at over 11,000 mg / kg and the manganese shedding rate at below 0.02%. The resulting nonwoven formaldehyde removal material has high catalytic activity, high air permeability, and high safety in use, making it suitable for continuous industrial production and effectively solving the problems of easy powder shedding, low loading, and poor stability in existing technologies.

[0063] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a nonwoven formaldehyde removal material loaded with 3D active manganese, characterized in that, The process includes the following steps: preparation of mixed slurry, composite loading, 3D construction, encapsulation and drying molding; The composite loading step is as follows: the nonwoven fabric is impregnated in a mixed slurry with a solid content of 2-3%, and then subjected to high-temperature rotary evaporation; the pressure during the impregnation process is 0.18-0.22 MPa, and the roll-off rate is 65-75%; the mixed slurry contains δ-active manganese and glue; the weight ratio of δ-active manganese to glue is (7.5-11):1; The 3D construction steps are as follows: the composite loaded material is pre-baked at 65-75℃ for 20-30s; then, the upper layer is weakly purged at 80-90℃ and wind speed of 0.8-1.2m / s for 15-25s, while the lower layer is strongly purged at 95-105℃ and wind speed of 1.5-2.2m / s for 20-30s; the purging of the upper and lower layers creates a temperature difference of 15-20℃ and a wind speed difference of 0.5-1.0m / s, causing active manganese to migrate and accumulate in the middle layer; finally, after curing in the middle zone at 85-95℃ for 35-55s, it is dried at 90-100℃ until the moisture content is ≤3%, thus completing the 3D construction.

2. The method for preparing the nonwoven formaldehyde removal material according to claim 1, characterized in that, The mixed slurry has a solid content of 2.5%, the pressure during the rolling process is 0.20 MPa, and the roll residue is 70%.

3. The method for preparing the nonwoven formaldehyde removal material according to claim 1, characterized in that, In the composite loading step, the temperature of high-temperature rotary evaporation is 60-75℃.

4. The method for preparing the nonwoven formaldehyde removal material according to claim 1, characterized in that, The encapsulation is performed using a mesh dispensing method.

5. The method for preparing the nonwoven formaldehyde removal material according to claim 1, characterized in that, The drying and molding process is as follows: pre-curing at 70-80℃ for 10-15 seconds, drying at 85-90℃ for 40-60 seconds, and drying at 95-100℃ for 20-30 seconds.

6. A nonwoven fabric formaldehyde removal material loaded with 3D active manganese, characterized in that, The aldehyde removal material is prepared by the method described in any one of claims 1-5 for loading 3D active manganese.

7. The nonwoven formaldehyde removal material loaded with 3D active manganese according to claim 6, characterized in that, The nonwoven formaldehyde removal material loaded with 3D active manganese has a manganese loading of ≥11000 mg / kg and a manganese shedding rate of ≤0.02%.

Images