A high-strength dust-free paper and a method for producing the same

Abstract

The application provides high-strength dust-free paper and a preparation method thereof, and comprises the following steps: taking treated hot-melt ultra-short fibers and fluff pulp wood fibers, adding modified soybean protein and microparticle silica gel; sending to a former, falling through a forming head and being adsorbed onto a forming screen under the action of vacuum suction under the forming screen to form a fiber web of the dust-free paper; compacting; sending to a hot-melt oven screen, heating and consolidating; and performing surface treatment and shaping through a cooling system to obtain the dust-free paper. The modified soybean protein and the microparticle silica gel are used to modify the fiber structure of the dust-free paper, the modified soybean protein has three important functional groups, among which, the azetidine structure can react with the -COOH on the fluff pulp wood fiber to form a covalent bond between them, which can significantly improve the strength of the dust-free paper; the epichlorohydrin and the epoxy group can react with the primary amine or the secondary amine of the soybean protein, and crosslink on the surface of the fluff pulp wood fiber to form a three-dimensional crosslinked network structure, thereby improving the strength of the paper.

Description

Technical Field

[0001] This invention relates to the field of functional paper technology, specifically to a high-strength dust-free paper and its preparation method. Background Technology

[0002] Dust-free paper, also known as dry-laid paper nonwoven fabric, is called dry paper or expanded core material. Its key process is air-laid web forming. Air-laid dry papermaking is a technology that uses short fibers to make paper. Because no water is used in the paper web production process (its key process forming process), it is called dry papermaking technology. Its products are also known as "dust-free paper" in my country.

[0003] The main fiber used in the production of cleanroom paper is fluff pulp from coniferous trees. This fluff pulp is broken down and loosened into individual fibers in a pulverizer. Other natural fibers or shorter synthetic fibers can also be used. Air is used instead of water as the carrier for dispersing and transporting the fibers. During forming, instead of dehydration, air is drawn in, causing the fibers to lay on a forming wire to form a paper web. During the forming process, the bonds between fibers are not based on hydrogen bonds, but rather on polymer adhesives or the thermally melted fibers themselves. Cleanroom paper is similar to ordinary paper, but it is softer, more fluffy, and has higher elasticity. It also has good dry and wet strength, thickness, and high absorbency. These excellent physical properties make cleanroom paper widely used in hygiene products, industrial wiping products, and specialty medical products. While cleanroom paper has many advantages, it also has several disadvantages, such as higher cost, lower strength, poor durability, and difficulty in recycling. Therefore, further improving its various properties, such as strength, based on existing cleanroom paper is a topic that needs to be researched and explored. Summary of the Invention

[0004] The technical problem to be solved: The purpose of this invention is to provide a high-strength cleanroom paper and its preparation method. Modified soybean protein and microcrystalline silica are used to modify the fiber structure of the cleanroom paper. After carboxymethylation and epichlorohydrin modification, soybean protein can generate three important functional groups, including azacyclobutane structure, epichlorohydrin, and epoxy group. The azacyclobutane structure can react with the -COOH groups on the fluff pulp fibers to form covalent bonds, significantly improving the strength of the cleanroom paper. Simultaneously, epichlorohydrin and epoxy group can react with the primary or secondary amines of soybean protein, self-crosslinking on the surface of the fluff pulp fibers to form a three-dimensional crosslinked network structure, thereby improving the paper's strength.

[0005] Technical solution: A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0006] Step 1: Take 20-30 parts of hot melt ultra-short fiber for opening, and 50-70 parts of fluff pulp wood pulp fiber for crushing and opening, and then plasma treatment;

[0007] Step 2: Add 10-15 parts modified soy protein and 2-5 parts micro-particle silica gel and mix;

[0008] Step 3: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net to form a dust-free paper fiber net.

[0009] Step 4: Compact the cleanroom paper fiber mesh;

[0010] Step 5: Place it on the wire mesh of a hot melt oven and heat it at a temperature of 125-160℃ to solidify;

[0011] Step 6: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0012] Furthermore, the plasma treatment conditions are: power of 10-30W, pressure of 30-40Pa, and time of 2-5s.

[0013] Furthermore, the method for preparing the modified soybean protein is as follows:

[0014] S1: Mix 4-5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0015] S2: Use an ultrafiltration membrane to ultrafilter and concentrate to 20 mL, then dilute to 200 mL with deionized water. Repeat ultrafiltration 3 times to obtain a carboxymethylated soybean protein solution.

[0016] S3: Slowly add 7-8 mL of epichlorohydrin to the carboxymethylated soybean protein solution in a 60℃ water bath, and react for 2-3 hours to obtain the modified soybean protein solution;

[0017] S4: Filter and dry to obtain modified soy protein.

[0018] Furthermore, the ultrafiltration membrane in S2 has a molecular weight cutoff of 10 kDa.

[0019] Furthermore, the microparticle silica gel has a three-dimensional network structure with a specific surface area of ​​1100-1200 m². 2 / g.

[0020] Furthermore, in step 3, the molding humidity is 60-75%.

[0021] Furthermore, in step 4, the compaction temperature is 80-90℃ and the pressure is 15-20 N / mm.

[0022] Beneficial effects:

[0023] 1. This invention uses modified soybean protein and micro-particle silica gel to modify the structure of cleanroom paper fibers. After carboxymethylation and epichlorohydrin modification, soybean protein can generate three important functional groups, including azacyclobutane structure, epichlorohydrin, and epoxy group. Among them, the azacyclobutane structure can react with -COOH on fluff pulp fibers to form covalent bonds, which can significantly improve the strength of cleanroom paper. At the same time, epichlorohydrin and epoxy group can react with primary or secondary amines of soybean protein and crosslink themselves on the surface of fluff pulp fibers to form a three-dimensional crosslinked network structure, thereby improving the strength of paper.

[0024] 2. The microparticle silica gel added in this invention is a three-dimensional network structure composed of smaller silica particles. It forms a composite stable structure with large three-dimensional cross-linked network structure and small three-dimensional network structure interwoven inside the dust-free paper, thereby improving the tensile strength of the paper. At the same time, the microparticle silica gel itself can also improve the smoothness and abrasion resistance of the paper. Detailed Implementation

[0025] Example 1

[0026] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0027] Step 1: Mix 4g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0028] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0029] Step 3: Slowly add 7 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 2 h, filter, and dry to obtain modified soy protein;

[0030] Step 4: Take 20kg of hot melt ultra-short fiber for opening, and 50kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 10W, pressure of 40Pa, and time of 5s.

[0031] Step 5: Add 10 kg of modified soy protein and 2 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0032] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 60%, forming a dust-free paper fiber net.

[0033] Step 7: Compact the dust-free paper fiber mesh at a temperature of 80℃ and a pressure of 15N / mm.

[0034] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 125°C to solidify;

[0035] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0036] Example 2

[0037] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0038] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0039] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0040] Step 3: Slowly add 8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 2-3 hours, filter, and dry to obtain modified soy protein;

[0041] Step 4: Take 25kg of hot melt ultra-short fiber for opening, and 55kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 15W, pressure of 35Pa, and time of 5s.

[0042] Step 5: Add 10 kg of modified soy protein and 3 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0043] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 65%, forming a dust-free paper fiber net.

[0044] Step 7: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 17N / mm.

[0045] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 130℃ to solidify;

[0046] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0047] Example 3

[0048] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0049] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0050] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0051] Step 3: Slowly add 7-8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 2-3 hours, filter, and dry to obtain modified soy protein;

[0052] Step 4: Take 25kg of hot melt ultra-short fiber for opening, and 60kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 20W, pressure of 35Pa, and time of 4s.

[0053] Step 5: Add 15 kg of modified soy protein and 4 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0054] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 70%, forming a dust-free paper fiber net.

[0055] Step 7: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 18N / mm.

[0056] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 140℃ to solidify;

[0057] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0058] Example 4

[0059] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0060] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0061] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0062] Step 3: Slowly add 8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 3 h, filter, and dry to obtain modified soy protein;

[0063] Step 4: Take 25kg of hot melt ultra-short fiber for opening, and 65kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 25W, pressure of 35Pa, and time of 4s.

[0064] Step 5: Add 15 kg of modified soy protein and 4 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0065] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 70%, forming a dust-free paper fiber net.

[0066] Step 7: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 19N / mm.

[0067] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 150℃ to solidify;

[0068] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0069] Example 5

[0070] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0071] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0072] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0073] Step 3: Slowly add 8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 3 h, filter, and dry to obtain modified soy protein;

[0074] Step 4: Take 25kg of hot melt ultra-short fiber for opening, and 65kg of fluff pulp wood pulp fiber is crushed and then opened, followed by plasma treatment. The treatment conditions are: power of 30W, pressure of 40Pa, and time of 5s.

[0075] Step 5: Add 13 kg of modified soy protein and 5 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0076] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 75%, forming a dust-free paper fiber net.

[0077] Step 7: Compact the dust-free paper fiber mesh at a temperature of 90℃ and a pressure of 20N / mm.

[0078] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 150℃ to solidify;

[0079] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0080] Example 6

[0081] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0082] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0083] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0084] Step 3: Slowly add 8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 3 h, filter, and dry to obtain modified soy protein;

[0085] Step 4: Take 30kg of hot melt ultra-short fiber for opening, and 70kg of fluff pulp wood pulp fiber for crushing and opening, and then treat with plasma. The treatment conditions are: power of 10W, pressure of 40Pa, and time of 5s.

[0086] Step 5: Add 15 kg of modified soy protein and 5 kg of microparticle silica gel and mix. The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0087] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 75%, forming a dust-free paper fiber net.

[0088] Step 7: Compact the dust-free paper fiber mesh at a temperature of 90℃ and a pressure of 20N / mm.

[0089] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 160℃ to solidify;

[0090] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0091] Comparative Example 1

[0092] The difference between this embodiment and Embodiment 4 is that modified soy protein is not added. Specifically:

[0093] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0094] Step 1: Take 25kg of hot melt ultra-short fiber for opening, and 65kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 25W, pressure of 35Pa, and time of 4s.

[0095] Step 2: Add 4 kg of micro-particle silica gel and mix. The micro-particle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g;

[0096] Step 3: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 70%, forming a dust-free paper fiber net.

[0097] Step 4: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 19N / mm.

[0098] Step 5: Place it on the wire mesh of a hot melt oven and heat it at 150℃ to solidify;

[0099] Step 6: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0100] Comparative Example 2

[0101] The difference between this embodiment and Embodiment 4 is that no microparticle silica gel is added, as detailed below:

[0102] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0103] Step 1: Mix 5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours.

[0104] Step 2: Use an ultrafiltration membrane with a molecular weight cutoff of 10 kDa to ultrafilter, concentrate to 20 mL, then dilute to 200 mL with deionized water, repeat ultrafiltration 3 times to obtain carboxymethylated soybean protein solution.

[0105] Step 3: Slowly add 8 mL of epichlorohydrin to the carboxymethylated soy protein solution in a 60℃ water bath, react for 3 h, filter, and dry to obtain modified soy protein;

[0106] Step 4: Take 25kg of hot melt ultra-short fiber for opening, and 65kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 25W, pressure of 35Pa, and time of 4s.

[0107] Step 5: Add 15 kg of modified soy protein;

[0108] Step 6: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 70%, forming a dust-free paper fiber net.

[0109] Step 7: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 19N / mm.

[0110] Step 8: Place it on the wire mesh of a hot melt oven and heat it at 150℃ to solidify;

[0111] Step 9: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0112] Comparative Example 3

[0113] The difference between this embodiment and Embodiment 4 is that soy protein is used directly, specifically:

[0114] A method for preparing high-strength cleanroom paper, comprising the following steps (parts by weight):

[0115] Step 1: Take 25kg of hot melt ultra-short fiber for opening, and 65kg of fluff pulp wood pulp fiber is crushed and then opened, and then treated with plasma. The treatment conditions are: power of 25W, pressure of 35Pa, and time of 4s.

[0116] Step 2: Add 15kg of soy protein and 4kg of micro-particle silica gel and mix. The micro-particle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200m². 2 / g;

[0117] Step 3: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net. The forming humidity is 70%, forming a dust-free paper fiber net.

[0118] Step 4: Compact the dust-free paper fiber mesh at a temperature of 85℃ and a pressure of 19N / mm.

[0119] Step 5: Place it on the wire mesh of a hot melt oven and heat it at 150℃ to solidify;

[0120] Step 6: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper.

[0121] Thickness measurement: A digital fabric thickness gauge with an accuracy of 0.01 mm was used, and the pressure was 0.5 kPa (pressor foot area 2500 mm²) according to the standard. 2 The thickness of the paper was tested at a pressure of 125 cN. Six points were randomly sampled from the entire width of the cleanroom paper to measure its average thickness. The tensile strength was determined using an electronic fabric tensile testing machine. According to the standard, the sample size was 50 mm × 200 mm (transverse × longitudinal), and the machine's upward speed was 100 mm / min. Six points were randomly sampled from the entire width of the cleanroom paper to measure its average tensile strength. The test results are shown in Table 1 below.

[0122] Table 1

[0123]

[0124] The above embodiments are provided to clearly and completely describe the technical solution and represent some, but not all, implementations of the present invention. However, the implementations of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

Claims

1. A method for preparing high-strength dust-free paper, characterized in that: By weight, the following steps are included: Step 1: Take 20-30 parts of hot melt ultra-short fiber for opening, and 50-70 parts of fluff pulp wood pulp fiber for crushing and opening, and then plasma treatment; Step 2: Add 10-15 parts modified soy protein and 2-5 parts micro-particle silica gel and mix; Step 3: The paper is sent to the forming device, where it is dispersed through the air inlet and kept floating. Under the vacuum suction under the forming net, it falls through the forming head and is adsorbed onto the forming net to form a dust-free paper fiber net. Step 4: Compact the cleanroom paper fiber mesh; Step 5: Place it on the wire mesh of a hot melt oven and heat it at a temperature of 125-160℃ to solidify; Step 6: After passing through the cooling system, the surface is treated and shaped to obtain high-strength dust-free paper; The method for preparing the modified soybean protein is as follows: S1: Mix 4-5g of soy protein, 5g of sodium chloroacetate and 10g of water, add 4.5g of 45% NaOH solution, heat to 40℃ and react for 2 hours, then rapidly heat to 70℃ and react for 2 hours. S2: Use an ultrafiltration membrane to ultrafilter and concentrate to 20 mL, then dilute to 200 mL with deionized water. Repeat ultrafiltration 3 times to obtain a carboxymethylated soybean protein solution. S3: Slowly add 7-8 mL of epichlorohydrin to the carboxymethylated soybean protein solution in a 60℃ water bath, and react for 2-3 hours to obtain the modified soybean protein solution; S4: Filter and dry to obtain modified soy protein.

2. The method for preparing high-strength dust-free paper according to claim 1, characterized in that: The plasma treatment conditions are: power of 10-30W, pressure of 30-40Pa, and time of 2-5s.

3. The method for preparing high-strength dust-free paper according to claim 1, characterized in that: The ultrafiltration membrane in S2 has a molecular weight cutoff of 10 kDa.

4. The method for preparing high-strength dust-free paper according to claim 1, characterized in that: The microparticle silica gel has a three-dimensional network structure and a specific surface area of ​​1100-1200 m². 2 / g.

5. The method for preparing high-strength dust-free paper according to claim 1, characterized in that: In step 3, the molding humidity is 60-75%.

6. The method for preparing high-strength cleanroom paper according to claim 1, characterized in that: In step 4, the compaction temperature is 80-90℃ and the pressure is 15-20 N / mm.

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