Antistatic paper and method for producing the same

Abstract

The application provides an antistatic paper and a preparation method thereof, and comprises the following steps: step 1: taking imported coniferous wood pulp from Russia, soaking in clean water before beating, defibrating, beating to 40SR, and balancing moisture; step 2: dissociating to be complete, adding a conductive component, and stirring for 10-15 min; step 3: performing papermaking, taking out the wet paper after papermaking, and hot-pressing on a hot press for 5-6 min; and step 4: vacuum drying at 110 DEG C, and obtaining the antistatic paper. The application adopts a "dandelion-like" conductive component with silver nanoparticles as a core and nano-fibers on the surface, the nano-fibers can be embedded into the wall of pulp fibers, and the silver nanoparticles can be distributed on the surface of the pulp fibers or into the cell cavity, and are firmly combined with the pulp, so that the silver nanoparticles are not easy to fall off, and the antistatic paper can long keep the "antistatic property".

Description

Technical Field

[0001] This invention relates to the field of functional paper technology, specifically to an antistatic paper and its preparation method. Background Technology

[0002] With the rapid development of industries such as electronics, instruments, and meters, the market demand for antistatic paper is constantly increasing. Currently, various types of antistatic paper products have appeared on the market, including antistatic papers of different specifications and performance. Antistatic paper is a type of paper with special functions. By controlling the resistivity of the paper material, it enables the paper to have antistatic properties within a certain range. Due to its unique antistatic properties, antistatic paper is widely used in many industries and fields: 1) Electronics industry: In the manufacturing, packaging, and transportation of electronic components, antistatic paper can effectively prevent static electricity from interfering with and damaging electronic components, protecting product quality and stability. 2) Instrumentation industry: In the manufacturing and transportation of precision instruments and meters, the use of antistatic paper can ensure that equipment is protected from static electricity interference, ensuring the accuracy of measurement and control. 3) Pharmaceutical industry: In the pharmaceutical process, antistatic paper can be used as cleaning paper or packaging material to prevent drugs from being contaminated by static electricity. 4) Printing industry: In the printing process, the use of antistatic paper can reduce electrostatic adsorption between papers, improving printing quality and efficiency.

[0003] Currently, antistatic paper is typically produced by coating the surface with an antistatic agent or by directly adding materials with good conductivity (such as carbon fiber, carbon black, etc.) and special treatment agents during the paper manufacturing process. Surface-coated antistatic agents are prone to peeling off during use and cannot maintain a good antistatic effect. Adding materials with good conductivity directly during paper manufacturing directly affects the paper's strength. Therefore, developing an antistatic paper that can maintain a long-term antistatic effect while also enhancing paper strength is an urgent problem to be solved. Summary of the Invention

[0004] The technical problem to be solved: The purpose of this invention is to provide an antistatic paper and its preparation method, which adopts a "dandelion-like" structure with silver nanoparticles as the core and conductive components of nanofibers covering the surface. The nanofibers can be embedded in the pulp fiber wall, while the silver nanoparticles can be distributed on the surface of the pulp fibers or enter the cell cavity, and are firmly combined with the pulp, so that the silver nanoparticles are not easy to fall off and can maintain the "antistatic properties" of the antistatic paper for a long time.

[0005] Technical solution: An antistatic paper, in which conductive components are added to the pulp. The conductive components have a "dandelion-like" structure, with silver nanoparticles as the core and nanofibers covering the surface.

[0006] Furthermore, the amount of the conductive component added is 0.03-0.07 wt.% of the oven-dry pulp weight.

[0007] Furthermore, the method for preparing the conductive component is as follows:

[0008] S1: Take silver nanoparticles, disperse them in distilled water, add Tris-Buffer and stir for 30 min, place in an ice bath, add dopamine hydrochloride solid particles and continue stirring for 30 min;

[0009] S2: Place in a 60℃ water bath and heat and stir for 7-8 hours, filter, wash with distilled water, and dry to obtain hydroxylated silver nanoparticles.

[0010] S3: Mix 5 parts of hydroxylated silver nanoparticles, 30 parts of glycidyl methacrylate monomer, 0.6 parts of cuprous bromide, 2.8 parts of bipyridine, and 30 parts of dioxane, place them in a reactor, use nitrogen as a protective gas, and polymerize at 65°C for 10 h; S4: After polymerization, transfer the product to an acetone solution and stir at 50 rpm for 30 min to remove impurities;

[0011] S5: Filter and collect, then transfer to a 2% EDTA solution to remove copper ions;

[0012] S6: Wash with deionized water and ethanol, and dry in a vacuum at 25°C to obtain the conductive component.

[0013] Furthermore, the mass-to-volume ratio of silver nanoparticles, distilled water, Tris-Buffer, and dopamine hydrochloride solid in S1 is 60 mg: 20 mL: 15 mL: 24 mg.

[0014] Furthermore, the concentration of Tris-Buffer in S1 is 10 mmol / L, and the pH is 8.5.

[0015] The method for preparing the above-mentioned antistatic paper includes the following steps:

[0016] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0017] Step 2: After complete dissociation, add the conductive component and stir for 10-15 minutes;

[0018] Step 3: Papermaking. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 5-6 minutes.

[0019] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0020] Furthermore, the hot pressing conditions in step 3 are 15 MPa and 80°C.

[0021] Furthermore, the amount of papermaking in step 3 is 60g / m.

[0022] Beneficial effects:

[0023] 1. This invention adopts a "dandelion-like" structure with silver nanoparticles as the core and conductive components of nanofibers covering the surface. The nanofibers can be embedded in the pulp fiber wall, while the silver nanoparticles can be distributed on the surface of the pulp fibers or enter the cell cavity, firmly binding with the pulp. This makes the silver nanoparticles less likely to fall off and can maintain the "antistatic properties" of the antistatic paper for a long time.

[0024] 2. This invention involves hydroxylating the silver nanoparticles, providing a large number of hydroxyl groups on their surface. This allows for easy polymerization to form nanofibers, ultimately leading to a strong bond with the pulp. Furthermore, the hydroxyl groups readily combine with polar water molecules to form a colloidal film. When the pulp dries, the water evaporates, and the fibers, under the surface tension of the water, shrink and move closer together. Hydrogen atoms in the hydroxyl groups form hydrogen bonds with oxygen atoms in adjacent hydroxyl groups, thereby enhancing the paper's strength. Simultaneously, the conductive nanofibers embedded in the pulp fiber walls are also fixed, further improving the paper's strength. However, experimental results also show that the amount of conductive component added has certain limits; otherwise, negative effects may occur.

[0025] 3. In this invention, nano-silver not only has excellent electrical conductivity but also good antibacterial properties. Therefore, the antistatic paper of this invention also has a certain antibacterial effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the conductive component in Example 1. Detailed Implementation

[0027] Example 1

[0028] The method for preparing the conductive component is as follows:

[0029] S1: Take silver nanoparticles, disperse them in distilled water, add Tris-Buffer and stir for 30 min, place in an ice bath, add dopamine hydrochloride solid particles, and continue stirring for 30 min; wherein, the mass-volume ratio of silver nanoparticles, distilled water, Tris-Buffer with a concentration of 10 mmol / L and pH=8.5 and dopamine hydrochloride solid is 60 mg: 20 mL: 15 mL: 24 mg;

[0030] S2: Place in a 60℃ water bath and heat and stir for 8 hours, filter, wash with distilled water, and dry to obtain hydroxylated silver nanoparticles.

[0031] S3: Mix 5g of hydroxylated silver nanoparticles, 30g of glycidyl methacrylate monomer, 0.6g of cuprous bromide, 2.8g of bipyridine and 30g of dioxane, place them in a reactor, use nitrogen as a protective gas, and polymerize at 65°C for 10h.

[0032] S4: After polymerization, the product is transferred to an acetone solution and stirred at 50 rpm for 30 min to remove impurities;

[0033] S5: Filter and collect, then transfer to a 2% EDTA solution to remove copper ions;

[0034] S6: Wash with deionized water and ethanol, and dry in a vacuum at 25°C to obtain the conductive component.

[0035] The conductive component has a "dandelion-like" structure, with silver nanoparticles as the core and nanofibers covering the surface, such as... Figure 1 As shown.

[0036] Example 2

[0037] The method for preparing antistatic paper includes the following steps:

[0038] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0039] Step 2: After complete dissociation, add the conductive component from Example 1. The amount of conductive component added is 0.03 wt.% of the oven-dry pulp weight, and stir for 13 min.

[0040] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0041] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0042] Example 3

[0043] The method for preparing antistatic paper includes the following steps:

[0044] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0045] Step 2: After complete dissociation, add the conductive component at a rate of 0.04 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0046] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0047] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0048] Example 4

[0049] The method for preparing antistatic paper includes the following steps:

[0050] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0051] Step 2: After complete dissociation, add the conductive component at a rate of 0.05 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0052] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0053] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0054] Example 5

[0055] The method for preparing antistatic paper includes the following steps:

[0056] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0057] Step 2: After complete dissociation, add the conductive component at a rate of 0.06 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0058] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0059] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0060] Example 6

[0061] The method for preparing antistatic paper includes the following steps:

[0062] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0063] Step 2: After complete dissociation, add the conductive component at a rate of 0.07 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0064] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0065] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0066] Comparative Example 1

[0067] The difference between this embodiment and Embodiment 5 is that the amount of conductive component added is 0.01 wt.% of the oven-dry pulp weight. Specifically, the method for preparing antistatic paper includes the following steps:

[0068] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0069] Step 2: After complete dissociation, add the conductive component at a rate of 0.01 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0070] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0071] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0072] Comparative Example 2

[0073] The difference between this embodiment and Embodiment 5 is that the amount of conductive component added is 0.10 wt.% of the oven-dry pulp weight, specifically as follows: The method for preparing antistatic paper includes the following steps:

[0074] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0075] Step 2: After complete dissociation, add the conductive component at a rate of 0.10 wt.% of the oven-dry pulp weight, and stir for 13 minutes.

[0076] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0077] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0078] Comparative Example 3

[0079] The difference between this embodiment and Embodiment 5 is that nano-silver particles are directly added, specifically:

[0080] The method for preparing antistatic paper includes the following steps:

[0081] Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture.

[0082] Step 2: After complete dissociation, add nano silver particles at a rate of 0.06 wt.% of the oven-dry pulp weight and stir for 13 min.

[0083] Step 3: Papermaking is carried out with a basis weight of 60g / m. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 6 minutes under the conditions of 15MPa and 80℃.

[0084] Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

[0085] Conductivity test: The conductivity of the antistatic paper was measured using a dual-electrical-meter four-probe tester, including the initial conductivity and the conductivity after 1 hour, 2 hours, and 3 hours of friction using a universal tribometer. The test results are shown in Table 1 below:

[0086] Table 1

[0087]

[0088] The physical properties of the antistatic paper prepared in each embodiment were determined. The tensile strength and bursting index of the samples were measured using an electronic tensile testing machine and a paper bursting strength tester, respectively. Data were processed and calculated according to GB / T453-2002 and CB / T454-2002. The test results are shown in Table 2 below:

[0089] Table 2

[0090] Tensile strength (kN / m) <![CDATA[Bursting strength index (kPa·m 2 / g)]]> Example 2 10.8 3.7 Example 3 11.2 3.9 Example 4 11.5 4.0 Example 5 11.7 4.1 Example 6 11.6 3.9 Comparative Example 1 10.1 3.4 Comparative Example 2 10.9 3.5 Comparative Example 3 8.8 3.0

[0091] 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. An antistatic paper, characterized in that: A conductive component is added to the pulp. The conductive component has a "dandelion-like" structure with silver nanoparticles as the core and nanofibers covering the surface. The method for preparing the conductive component is as follows: S1: Take silver nanoparticles, disperse them in distilled water, add Tris-Buffer and stir for 30 min, place in an ice bath, add dopamine hydrochloride solid particles and continue stirring for 30 min; S2: Place in a 60℃ water bath and heat and stir for 7-8 hours, filter, wash with distilled water, and dry to obtain hydroxylated silver nanoparticles. S3: Mix 5 parts of hydroxylated silver nanoparticles, 30 parts of glycidyl methacrylate monomer, 0.6 parts of cuprous bromide, 2.8 parts of bipyridine and 30 parts of dioxane, place them in a reactor, use nitrogen as a protective gas, and polymerize at 65°C for 10 hours. S4: After polymerization, the product is transferred to an acetone solution and stirred at 50 rpm for 30 min to remove impurities; S5: Filter and collect, then transfer to a 2% EDTA solution to remove copper ions; S6: Wash with deionized water and ethanol, and dry in a vacuum at 25°C to obtain the conductive component.

2. The antistatic paper according to claim 1, characterized in that: The amount of the conductive component added is 0.03-0.07 wt. of the oven-dry pulp weight.

3. The antistatic paper according to claim 1, characterized in that: The mass-to-volume ratio of silver nanoparticles, distilled water, Tris-Buffer, and dopamine hydrochloride solid in S1 is 60 mg: 20 mL: 15 mL: 24 mg.

4. The antistatic paper according to claim 1, characterized in that: The concentration of Tris-Buffer in S1 is 10 mmol / L, and the pH is 8.

5.

5. A method for preparing antistatic paper according to any one of claims 1-4, characterized in that: Includes the following steps: Step 1: Take imported Russian softwood pulp, soak it in clean water for 2 hours before pulping to loosen it, and pulp it to 40°SR to balance the moisture. Step 2: After complete dissociation, add the conductive component and stir for 10-15 minutes; Step 3: Papermaking. After the wet paper is produced, it is taken out and hot-pressed on a hot press for 5-6 minutes. Step 4: Vacuum dry at 110℃ to obtain antistatic paper.

6. The method for preparing antistatic paper according to claim 5, characterized in that: The papermaking quantity in step 3 is 60g / m³. 2 .

7. The method for preparing antistatic paper according to claim 5, characterized in that: The hot pressing conditions in step 3 are 15 MPa and 80°C.

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