A super-hydrophobic paper pulp molding, a preparation method and application thereof

Abstract

The application provides a paper pulp molding with super-hydrophobic function, a preparation method and application, and the paper pulp molding with super-hydrophobic function comprises modified powder fillers, a crosslinking agent and paper pulp, the modified powder fillers are modified recycled silicon dioxide, and the modified recycled silicon dioxide is obtained by surface grafting modification of a silane modifier and a silane coupling agent on recycled silicon dioxide. In the application, the modified recycled silicon dioxide is obtained by surface grafting modification of the recycled silicon dioxide by the silane modifier and the silane coupling agent, the moisture resistance of the paper pulp molding can be improved by the modified recycled silicon dioxide, the waterproof capability of the paper pulp molding product can be improved, and the goods packaged by the paper pulp molding paper sheet can be prevented from being damaged.

Description

Technical Field

[0001] This invention relates to the field of pulp molding technology, and in particular to a pulp molding process with superhydrophobic properties, its preparation method, and its application. Background Technology

[0002] While pulp molding packaging products offer advantages such as being green, pollution-free, and environmentally friendly, pulp molding technology—a processing method that utilizes pulp materials through molding—focuses on mixing pulp with appropriate additives to form a plastic paste. This paste is then injected into a mold, and under appropriate pressure and temperature, the pulp is shaped into the desired form. Post-processing, including drying, yields pulp products with a certain strength and shape. Compared to traditional plastic processing methods, pulp molding technology has significant environmental advantages. Traditional plastics are typically made from petrochemical raw materials, which are difficult to degrade and have a serious impact on the environment. Pulp molding materials, on the other hand, are mostly derived from renewable resources such as waste paper, possessing good recyclability and biodegradability, and are expected to effectively reduce the environmental burden of packaging waste. Furthermore, the pulp molding production process has relatively low energy consumption and does not require high-temperature, high-pressure conditions, making it more environmentally friendly. Therefore, pulp molding technology has broad application prospects in the field of sustainable packaging.

[0003] In the existing technology, with the large-scale application of pulp molding, coupled with the fact that the packaged goods and pulp products themselves have a certain weight, the packaging materials are prone to a reduction in mechanical properties or even collapse during long-term storage and transportation due to the moisture-absorbing properties of paper products, which can damage the packaged goods. Therefore, improving the moisture and water resistance of pulp molding products has received increasing attention. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a superhydrophobic pulp molding, preparation method and application, so as to at least solve the shortcomings of the prior art.

[0005] In a first aspect, the present invention provides a superhydrophobic pulp molding, comprising modified powder filler, crosslinking agent and pulp, wherein the modified powder filler is modified recycled silica, and the modified recycled silica is obtained by surface grafting modification of recycled silica with silane modifier and silane coupling agent.

[0006] Compared with the prior art, the beneficial effect of the present invention is that modified recycled silica is obtained by surface grafting modification of recycled silica with silane modifier and silane coupling agent. Modified recycled silica can improve the moisture resistance of pulp molding, thereby improving the waterproof ability of pulp molded products, and thus preventing damage to goods packaged in pulp molded paper sheets.

[0007] Furthermore, the mass ratio of the modified powder filler to the pulp is 1:0.5~50, and the mass ratio of the recycled silica to the silane coupling agent is 1:0.01~5.

[0008] Furthermore, the silane coupling agent is composed of at least two of the following: methyltrimethoxysilane, methyltriethoxysilane, dodecyltrimethoxysilane, dodecyltrichlorosilane, n-octyltrimethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, trimethoxytridecylfluoron-octylsilane, perfluorooctanoic acid, β-(3,4-epoxyethyl)ethyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, β-(3,4-epoxyethyl)ethyltriethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, N-β(aminoethyl)-3-aminopropyltrimethoxysilane, and N-β(aminoethyl)-3-aminopropyltriethoxysilane.

[0009] Furthermore, the crosslinking agent is one of aluminum phosphate, tannic acid, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and vinyltrimethoxysilane.

[0010] Secondly, the present invention also provides a method for preparing superhydrophobic pulp molding, applied to the above-mentioned superhydrophobic pulp molding, the method comprising:

[0011] Modified recovered silica was obtained by surface grafting modification with a silane coupling agent.

[0012] Composite pulp was prepared by mixing the modified recycled silica with pulp and reacting it under crosslinking agent conditions.

[0013] The composite pulp is molded by drying the paper film blank.

[0014] Furthermore, the step of surface grafting and modifying recycled silica with a silane coupling agent to obtain modified recycled silica includes:

[0015] The recycled silica powder is mixed with the first solvent to obtain the first mixture;

[0016] The first mixture is mixed with the silane coupling agent to obtain a second mixture, and the second mixture is stirred at a preset temperature to obtain a stirred liquid, wherein the stirring time is 4h~24h;

[0017] The stirred liquid is subjected to solid-liquid separation and then washed and dried sequentially to obtain a semi-finished product, modified and recovered silica.

[0018] The modified recycled silica is dissolved in the first solvent to obtain a modified recycled silica solution;

[0019] Wherein, the first solvent is at least one of methanol, ethanol, toluene, isopropanol, acetone or cyclohexane;

[0020] The amount of solvent corresponding to each gram of the recovered silica is 10 mL to 800 mL;

[0021] The mass ratio of the recovered silica to the silane coupling agent is 1:0.1~5.

[0022] Furthermore, the step of mixing the modified recycled silica with pulp and reacting it under crosslinking agent conditions to prepare composite pulp includes:

[0023] A second mixture is obtained by mixing a crosslinking agent, the pulp, and a second solvent. The second mixture is then mixed with a recycled modified silica solution and reacted at a preset pH value to obtain a composite pulp.

[0024] The second solvent is a mixture of at least one or more of methanol, ethanol, 2-methoxyethanol, toluene, isopropanol, water, acetone or cyclohexane;

[0025] The amount of the second solvent used per gram of the recovered modified silica solution is 10 mL to 800 mL.

[0026] Furthermore, the preset pH value is 8~12.

[0027] Furthermore, the step of drying the composite pulp by forming a paper film preform includes:

[0028] The composite pulp is prepared into pulp molded material by sequentially using compression molding, drying and shaping.

[0029] Thirdly, the present invention also provides an application of the above-mentioned superhydrophobic pulp molding, applied to packaging materials. Attached Figure Description

[0030] Figure 1 (a) shows the SEM image of the pulp molding of Example 1. Figure 1 (b) shows the SEM image of the pulp molding in Example 2. Figure 1 Image (c) is a SEM image of the pulp molding in Example 3. Figure 1 Image (d) is a SEM image of the pulp molding prepared in Example 4; Figure 1 (e) is a SEM image of the pulp molding prepared in Comparative Example 1.

[0031] Figure 2 These are diagrams illustrating the abrasion resistance testing process of the pulp molding prepared in Examples 1 to 4 and Comparative Example 1 of the present invention.

[0032] Figure 3 These are test graphs showing the abrasion resistance of the pulp molding prepared in Examples 1 to 4 and Comparative Example 1 of the present invention.

[0033] Figure 4 These are test graphs showing the acid and alkali resistance of the pulp molding prepared in Examples 1 to 4 and Comparative Example 1 of the present invention.

[0034] Figure 5 These are temperature resistance test diagrams of the pulp molding prepared in Examples 1 to 4 and Comparative Example 1 of the present invention.

[0035] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0037] Nanoparticles are a class of particles composed of a small number of atoms and molecules, with a size of less than or equal to 100 nanometers. They are mainly produced in the transition region between atomic clusters and macroscopic objects. Simply put, materials composed of nanoparticles are materials whose size in three-dimensional space is at least in the nanoscale. Due to their unique nanoscale, nanomaterials possess characteristics such as high activity, high surface area, and good binding effect. When nanoparticles are combined with cellulose pulp, they not only retain their original unique and excellent properties, but also compensate for the voids and defects in the pulp, further enhancing the moldability of the pulp.

[0038] Example 1

[0039] The first embodiment of the present invention provides a superhydrophobic pulp molding, comprising modified powder filler, crosslinking agent and pulp, wherein the modified powder filler is modified recycled silica, and the modified recycled silica is obtained by surface grafting modification of recycled silica with silane modifier and silane coupling agent.

[0040] The preparation method of the superhydrophobic pulp molding includes steps S1 to S3:

[0041] S1, modified recycled silica is obtained by surface grafting modification of recycled silica using a silane coupling agent;

[0042] Specifically, step S1 includes steps S11 to S14:

[0043] S11, the recycled silica powder is mixed with the first solvent to obtain the first mixture;

[0044] It should be explained that recycled silica powder is a commercially available raw material. Using it can reduce costs, reduce resource waste, reduce environmental pollution, and improve economic efficiency, which has significant environmental and economic implications. Compared with other methods, it greatly reduces costs, and the resulting material has a complete structure.

[0045] S12, the first mixture is mixed with the silane coupling agent to obtain a second mixture, and the second mixture is stirred at a preset temperature to obtain a stirred liquid, wherein the stirring time is 4 hours;

[0046] It should be explained that modified recycled silica powder is obtained by surface grafting with a silane coupling agent. Surface modification reduces its surface free energy, allowing for better grafting with the pulp matrix. The recycled silica powder and the silane coupling agent achieve the modification effect through chemical bonds.

[0047] S13, the stirred liquid is subjected to solid-liquid separation and then washed and dried sequentially to obtain semi-finished modified and recycled silica;

[0048] S14, dissolve the semi-finished modified recycled silica in a solution to obtain modified recycled silica;

[0049] It should be explained that the preparation process of modified recycled silica powder includes: mixing the recycled silica powder with a solvent, then mixing and stirring with a silane coupling agent for 4 hours, followed by solid-liquid separation, washing, and drying. To ensure rapid and uniform mixing of the raw materials, ultrasonic stirring can be used. After stirring for 4 hours, a pale yellow suspension is obtained. The precursor is removed, centrifuged, and washed with water or alcohol at least three times. The centrifuged precipitate is then dried in a vacuum drying oven to obtain modified recycled silica.

[0050] In this embodiment, the first solvent is methanol. In other optional embodiments, the first solvent is one of ethanol, toluene, isopropanol, acetone or cyclohexane.

[0051] The silane coupling agent is composed of methyltrimethoxysilane and methyltriethoxysilane. In other optional embodiments, the silane coupling agent is composed of at least two of the following: dodecyltrimethoxysilane, dodecyltrichlorosilane, n-octyltrimethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, trimethoxytridecylfluoron-octylsilane, perfluorooctanoic acid, β-(3,4-epoxyethyl)ethyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, β-(3,4-epoxyethyl)ethyltriethoxysilane, 3-aminopropyltriethoxysilane, 3-glycidyl etheroxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, N-β(aminoethyl)-3-aminopropyltrimethoxysilane, and N-β(aminoethyl)-3-aminopropyltriethoxysilane. Specifically, all of the above-mentioned silane coupling agents are commercially available raw materials, such as γ-aminopropyltriethoxysilane.

[0052] It should be noted that the amount of the first solvent used is 10 mL per gram of recovered silica powder. The mass ratio of recovered silica powder to silane coupling agent is 1:0.1.

[0053] S2, the modified recycled silica is mixed with pulp and reacted under crosslinking agent conditions to prepare composite pulp;

[0054] Specifically, step S2 includes step S21:

[0055] S21, the crosslinking agent, the pulp and the second solvent are mixed to obtain a second mixture, the second mixture is mixed with the recycled modified silica solution and reacted at a preset pH value to obtain composite pulp;

[0056] It should be explained that the reaction process involves heating and stirring for 4 hours at a temperature of 50 degrees Celsius.

[0057] In this embodiment, the second solvent is always methanol. In other optional embodiments, the second solvent is at least one or a mixture of ethanol, 2-methoxyethanol, toluene, isopropanol, water, acetone, or cyclohexane.

[0058] In this embodiment, aluminum phosphate is used as the crosslinking agent. In other optional embodiments, the crosslinking agent is one of tannic acid, 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and vinyltrimethoxysilane. Specifically, all of the above silane coupling agents are commercially available raw materials, such as aluminum phosphate.

[0059] S3, the composite pulp is dried by forming a paper film blank to obtain pulp molding;

[0060] Specifically, step S3 includes step S31:

[0061] S31, the composite pulp is prepared into pulp molding by sequentially using molding, drying and shaping.

[0062] It needs to be explained that the working surface of the pulp-forming mold is immersed in the working pulp. A vacuum is then applied to adsorb a layer of pulp onto the working surface of the mold. The mold is then removed from the working pulp, some moisture is removed, and the mold is demolded to create a wet blank for the paper tray. This blank is then pressed using a forming machine to remove any remaining moisture from the paper mold during the forming process, reducing the cost of drying and dehydration. Simultaneously, pressing improves the bonding strength between fibers and increases the strength of the paper mold. Drying is the process of heating and evaporating the remaining moisture in the paper mold using heat in a drying oven. Finally, the pulp molding is obtained.

[0063] The specific implementation process in this embodiment is as follows:

[0064] In this embodiment, recycled silica nanoparticles were weighed. 2 g of the recycled silica nanoparticles were dissolved in 150 mL of an alcohol-water mixture after sonication for 2 h. The methanol:ethanol:water ratio in the alcohol-water mixture was 1:1:1 (v). 4 g of HDTMS and 2 g of KH550 were added and stirred for 2 h. Then, 0.5 g of ammonia and 6 g of deionized water were added, and the mixture was stirred at 60 °C for 12 h. After the reaction was complete, the product was centrifuged and washed three times each with water and alcohol. The centrifuged precipitate was dried in a vacuum drying oven at 80 °C for 18 h to obtain modified recycled silica nanoparticles. The modified recycled silica nanoparticles were then dissolved in methanol to obtain a hydrophobic modified recycled silica nanosol.

[0065] Waste newspapers and old cardboard were crushed and decomposed using a pulping machine, and diluted with water to a pulp concentration of 12 mg / mL. Then, an appropriate amount of zinc chloride was added, and the mixture was stirred at 90°C for 12 h. Hydrophobic modified recycled silica nanosol was added to the above pulp, and the pH value was adjusted to 8.5. TA was added and stirred for 12 h to obtain hydrophobic pulp.

[0066] The working surface of the suction forming mold is immersed in the working pulp. A layer of pulp is adsorbed onto the working surface of the mold by vacuuming. Then the mold is removed from the working pulp, some of the water is removed and the mold is demolded to make a wet blank of the paper tray.

[0067] First, the paper mold is pressed by a pressing machine to remove the water that was not released during the molding process. Then, the paper mold is heated and evaporated in a drying oven to remove the remaining water in the paper mold, so as to obtain pulp molding.

[0068] Example 2

[0069] The difference between the second embodiment and the first embodiment of the present invention is that:

[0070] In this embodiment, recycled silica nanoparticles were weighed. 2 g of the recycled silica nanoparticles were dissolved in 150 mL of methanol by sonication for 2 h. 4 g of HDTMS and 2 g of KH550 were added and stirred for 2 h. Then, 0.5 g of ammonia and 6 g of deionized water were added, and the mixture was stirred at 60 °C for 12 h. After the reaction was complete, the product was centrifuged and washed three times each with water and alcohol. The centrifuged precipitate was dried in a vacuum drying oven at 80 °C for 18 h to obtain modified recycled silica nanoparticles. The modified recycled silica nanoparticles were then dissolved in methanol to obtain a hydrophobic modified recycled silica nanosol.

[0071] Waste newspapers and old cardboard were crushed and decomposed using a pulping machine, and diluted with water to a pulp concentration of 12 mg / mL. Then, an appropriate amount of zinc chloride was added, and the mixture was stirred at 90°C for 12 h. Hydrophobic modified recycled silica nanosol was added to the above pulp, and the pH value was adjusted to 8.5. AP was added and stirred for 12 h to obtain hydrophobic pulp.

[0072] The working surface of the suction forming mold is immersed in the working pulp. A layer of pulp is adsorbed onto the working surface of the mold by vacuuming. Then the mold is removed from the working pulp, some of the water is removed and the mold is demolded to make a wet blank of the paper tray.

[0073] First, the paper mold is pressed by a pressing machine to remove the water that was not released during the molding process. Then, the paper mold is heated and evaporated in a drying oven to remove the remaining water in the paper mold, so as to obtain pulp molding.

[0074] Example 3

[0075] The third embodiment of the present invention differs from the embodiments described above in that:

[0076] In this embodiment, recycled silica nanoparticles were weighed. 2 g of the recycled silica nanoparticles were dissolved in 150 mL of methanol by sonication for 2 h. 4 mL of HD-111 and 2 mL of KH560 were added and stirred for 1 h. Then, 0.5 mL of ammonia and 6 mL of deionized water were added, and the mixture was stirred at 60 °C for 12 h. After the reaction was complete, the product was centrifuged and washed three times each with water and alcohol. The centrifuged precipitate was dried in a vacuum drying oven at 80 °C for 18 h to obtain modified recycled silica nanoparticles. The modified recycled silica nanoparticles were then dissolved in methanol to obtain a hydrophobic modified recycled silica nanosol.

[0077] Waste newspapers and old cardboard were crushed and decomposed using a pulping machine, and diluted with water to a pulp concentration of 12 mg / mL. Then, an appropriate amount of zinc chloride was added, and the mixture was stirred at 90°C for 12 h. Hydrophobic modified recycled silica nanosol was added to the above pulp, and the pH value was adjusted to 8.5. AP was added and stirred for 12 h to obtain hydrophobic pulp.

[0078] The working surface of the suction forming mold is immersed in the working pulp. A layer of pulp is adsorbed onto the working surface of the mold by vacuuming. Then the mold is removed from the working pulp, some of the water is removed and the mold is demolded to make a wet blank of the paper tray.

[0079] First, the paper mold is pressed by a pressing machine to remove the water that was not released during the molding process. Then, the paper mold is heated and evaporated in a drying oven to remove the remaining water in the paper mold, so as to obtain pulp molding.

[0080] Example 4

[0081] The fourth embodiment of the present invention differs from the embodiments described above in that:

[0082] In this embodiment, recycled silica nanoparticles were weighed. 2 g of the recycled silica nanoparticles were dissolved in 150 mL of methanol by sonication for 2 h. 4 mL of HD-111 and 2 mL of KH580 were added and stirred for 2 h. Then, 0.5 mL of ammonia and 6 mL of deionized water were added, and the mixture was stirred at 60 °C for 12 h. After the reaction was complete, the product was centrifuged and washed three times each with water and alcohol. The centrifuged precipitate was dried in a vacuum drying oven at 80 °C for 18 h to obtain modified recycled silica nanoparticles. The modified recycled silica nanoparticles were then dissolved in methanol to obtain a hydrophobic modified recycled silica nanosol.

[0083] Waste newspapers and old cardboard were crushed and decomposed using a pulping machine, and diluted with water to a pulp concentration of 12 mg / mL. Then, an appropriate amount of zinc chloride was added, and the mixture was stirred at 90°C for 12 h. Hydrophobic modified recycled silica nanosol was added to the above pulp, and the pH value was adjusted to 8.5 to obtain hydrophobic pulp.

[0084] The working surface of the suction forming mold is immersed in the working pulp. A layer of pulp is adsorbed onto the working surface of the mold by vacuuming. Then the mold is removed from the working pulp, some of the water is removed and the mold is demolded to make a wet blank of the paper tray.

[0085] First, the paper mold is pressed by a pressing machine to remove the water that was not released during the molding process. Then, the paper mold is heated and evaporated in a drying oven to remove the remaining water in the paper mold, so as to obtain pulp molding.

[0086] Comparative Example 1

[0087] Waste newspapers and old cardboard are crushed and decomposed in a pulping machine, diluted with water to a pulp concentration of 12 mg / mL, and then an appropriate amount of zinc chloride is added and stirred at 90°C for 12 h to obtain pulp.

[0088] The working surface of the suction forming mold is immersed in the working pulp. A layer of pulp is adsorbed onto the working surface of the mold by vacuuming. Then the mold is removed from the working pulp, some of the water is removed and the mold is demolded to make a wet blank of the paper tray.

[0089] First, the paper mold is pressed by a pressing machine to remove the water that was not released during the molding process. Then, the paper mold is heated and evaporated in a drying oven to remove the remaining water in the paper mold, so as to obtain pulp molding.

[0090] The performance of the pulp molding prepared in Examples 1 to 4 and Comparative Example 1 was tested:

[0091] Experimental Example 1

[0092] The moisture content of the molded pulp was tested and compared with that of Comparative Example 1. The results are shown in Table 1.

[0093] Moisture content = (wet weight - dry weight) / dry weight × 100%;

[0094] Table 1

[0095]

[0096] Table 1 shows the moisture content test of the pulp molding. As can be seen from Table 1, the moisture content of the pulp molding prepared in each embodiment of the present invention is about 100%, which is much lower than that of conventional pulp molding. This is because the added hydrophobic silica nanoparticles contain hydrophobic groups that reduce water adsorption and reduce the energy required for drying, thereby significantly reducing the energy consumption of pulp molding material preparation.

[0097] Experimental Example 2

[0098] The moisture content of the molded pulp was tested and compared with that of Comparative Example 1. The results are as follows: Figure 1 And as shown in Table 2:

[0099] Test method: Place the sample in a humidity chamber and conduct a test for 48 hours at a relative humidity of (93±2)% and a temperature of 20~30℃±1K. Measure the mass of the sample before and after the test.

[0100] Table 2

[0101]

[0102] Table 2 shows the moisture-proof performance test results of the pulp molding. As can be seen from Table 2, the moisture absorption rate of the pulp molding prepared in each embodiment of the present invention is less than 10%, which is far lower than that of conventional pulp molding. Simultaneously, through…Figure 1 It can be clearly seen that, compared with Comparative Example 1, the internal pores in Examples 1 to 4 are significantly lower than those in Comparative Example 1. This is because the added hydrophobic silica nanoparticles can fill the pores formed by the stacking of cellulose inside the mold during the preparation process, reduce its porosity, and improve the moisture-proof and waterproof performance of the pulp mold.

[0103] Experimental Example 3

[0104] Stability tests were conducted on the pulp molding process; detailed results can be found in [reference needed]. Figures 3 to 5 :

[0105] Test methods: finger rubbing test, pH test, and temperature test;

[0106] It is worth noting that for details on the finger rubbing experiment, please refer to [link / reference needed]. Figure 2 ,from Figures 3 to 5 As can be seen from the graphs, the pulp molding prepared in Examples 1 to 4 of this invention underwent finger wiping experiments, pH tests, and temperature tests. Figures 3 to 5 It can be seen that the pulp moldings obtained in Examples 1, 2, 3, and 4 exhibit superior stability compared to Comparative Example 1. This is because silica is firmly bonded to the pulp fibers through chemical bonds, resulting in excellent stability.

[0107] In addition, the present invention also provides an application of superhydrophobic pulp molding, which is applied to packaging materials.

[0108] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0109] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A type of pulp molding with superhydrophobic properties, characterized in that, The product includes modified powder filler, crosslinking agent, and pulp. The modified powder filler is modified recycled silica, which is obtained by surface grafting modification of recycled silica with silane modifier and silane coupling agent. The silane coupling agent is one of methyltrimethoxysilane, n-octyltrimethoxysilane, 3-(2,3-epoxypropoxy)propyltrimethoxysilane, 3-aminopropyltriethoxysilane or trimethoxytridecylfluoron-octylsilane. The silane modifier is one of dodecyltrimethoxy / trichlorosilane or dodecyltrimethoxysilane; The crosslinking agent is either aluminum phosphate or tannic acid; The modified powder filler has a mass ratio of 1:0.5 to 50 to the pulp, and the recycled silica has a mass ratio of 1:0.1 to 5 to the silane coupling agent.

2. A method for preparing superhydrophobic pulp molding according to claim 1, characterized in that, The method includes: Modified recovered silica was obtained by surface grafting modification of recovered silica using silane coupling agents and silane modifiers. Composite pulp was prepared by mixing the modified recycled silica with pulp and reacting it under crosslinking agent conditions. The composite pulp is molded by drying the paper film blank.

3. The method for preparing superhydrophobic pulp molding according to claim 2, characterized in that, The step of surface grafting and modifying recycled silica with silane coupling agents and silane modifiers to obtain modified recycled silica includes: The recycled silica powder is mixed with the first solvent to obtain the first mixture; The first mixture is mixed with the silane coupling agent and the silane modifier, and deionized water is added to obtain a second mixture. The second mixture is stirred at a preset temperature to obtain a stirred liquid, wherein the stirring time is 4h~24h. The stirred liquid is subjected to solid-liquid separation and then washed and dried sequentially to obtain a semi-finished product, modified and recovered silica. The modified recycled silica is dissolved in the first solvent to obtain a modified recycled silica solution; Wherein, the first solvent is at least one of methanol, ethanol, toluene, isopropanol, acetone or cyclohexane; The amount of solvent corresponding to each gram of the recovered silica is 10 mL to 800 mL; The mass ratio of the recovered silica to the silane coupling agent is 1:0.1~5.

4. The method for preparing superhydrophobic pulp molding according to claim 2, characterized in that, The step of preparing composite pulp by mixing the modified recycled silica with pulp and reacting it under crosslinking agent conditions includes: A second mixture is obtained by mixing a crosslinking agent, the pulp, and a second solvent. The second mixture is then mixed with a modified recycled silica solution and reacted at a preset pH value to obtain a composite pulp. The second solvent is a mixture of at least one or more of methanol, ethanol, 2-methoxyethanol, toluene, isopropanol, water, acetone or cyclohexane; The amount of the second solvent used per gram of the modified recycled silica solution is 10 mL to 800 mL.

5. The method for preparing superhydrophobic pulp molding according to claim 4, characterized in that, The preset pH value is 8~12.

6. The method for preparing superhydrophobic pulp molding according to claim 2, characterized in that, The step of drying the composite pulp by forming a paper film preform includes: The composite pulp is prepared into pulp molded material by sequentially using compression molding, drying and shaping.

7. An application of superhydrophobic pulp molding as described in claim 1, characterized in that, Used in packaging materials.

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