Preparation method of molded pulp comb

Abstract

The invention relates to the technical field of paper pulp molded products, in particular to a preparation method of a paper pulp molded comb, which is characterized in that mixed wood pulp fibers and bamboo pulp fibers are treated by alkali liquor, so that the porosity of the fibers and the activity of groups on the surfaces of the fibers can be improved; a dopamine cross-linking layer is formed on the surface of the fiber dispersed with the polydopamine, so that the polydopamine plays a role of an adhesive, and the palm wax with a hydrophobic effect forms a hydrophobic film on the surface of the fiber, so that the prepared paper pulp base material has relatively good hydrophobicity; secondly, the starch is modified by using polyhexamethylene guanidine hydrochloride, and the modified starch is used for preparing the molded pulp comb, so that the comb has an antibacterial property, which is of great significance in reducing bacteria breeding in the use process of the comb and protecting the health of a user, and the performance of the modified starch is also improved; the durability of the molded pulp comb is enhanced, and the molded pulp comb is not prone to damage or deformation in the using process.

Description

Technical Field

[0001] The present invention relates to the technical field of pulp molding products, and particularly relates to a preparation method of a pulp molding comb. Background Art

[0002] In the field of daily necessities, as a necessary personal care item, the material and performance of combs have always been highly concerned. With the increasing global environmental awareness, traditional plastic combs are gradually being phased out by consumers and the market due to their non-degradability and potential harm to the environment. As a new type of environmentally friendly material, pulp molding products have gradually emerged in the fields of packaging, tableware, household items, etc. due to their advantages such as degradability, safety, and low cost. Therefore, developing a pulp molding comb not only conforms to the current environmental protection trend but also meets the market's demand for high-quality and high-performance combs.

[0003] Although pulp molding products have made remarkable progress in many fields, there are still many challenges in preparing combs with complex shapes and high-performance requirements. First, the forming accuracy and strength of pulp molding products are affected by various factors such as fiber length, pulp concentration, types and dosages of additives, etc., and precise control is required to ensure the fineness and durability of the combs. Second, traditional pulp molding products often lack functions such as waterproof and oil-proof, and it is difficult to meet the actual needs of combs in daily use. Moreover, existing pulp molding combs need to be further improved in terms of antibacterial performance and durability due to their mostly plant fiber raw materials. Therefore, how to prepare a pulp molding comb with good antibacterial performance and waterproof and oil-proof properties has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] Problems to be Solved by the Technology

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a preparation method of a pulp molding comb, which can effectively solve the problems of poor antibacterial performance and durability of the pulp molding comb in the prior art.

[0006] Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A preparation method of a pulp molding comb, the preparation method comprising the following steps: S1. Prepare a pulp base material with different fibers as raw materials, and then modify the pulp base material with dopamine to prepare a hydrophobic base material; S2. Modify starch to prepare an antibacterial starch component, modify nano-silica to prepare an antibacterial nano-silica component, and use chitosan and alkyl ketene dimer as raw materials to prepare a waterproof and oil-proof emulsion component; S3. Weigh 1 - 2 parts by weight of the antibacterial starch component, 2 - 3 parts by weight of the antibacterial silica component, 2 - 3 parts by weight of polyvinyl alcohol, and 1 - 2 parts by weight of cationic polyacrylamide, disperse them in 100 parts by weight of deionized water. After mixing and dispersing evenly, the obtained is the antibacterial starch mixture. S4. Weigh 50 - 60 parts by weight of the hydrophobic base material, 6 - 10 parts by weight of the waterproof and oil - proof emulsion component, and 15 - 20 parts by weight of the antibacterial starch mixture for mixing and homogenizing. The obtained is the slurry component. S5. Pour the slurry component into a comb mold to form a mold blank. Then, under the conditions of a temperature of 170 °C and a pressure of 40 MPa, press for 100 s to form. After cooling to room temperature, place it in an oven at 68 °C and dry for 30 min. The obtained is the pulp - molded comb.

[0008] Furthermore, in S1, the preparation method of the pulp base material is as follows: Mix wood pulp fibers and bamboo pulp fibers in an equal weight ratio, then pour them into a potassium hydroxide alkali solution with a mass fraction of 8%. Heat to 45 °C and soak for 8 h at a constant temperature. During the soaking process, stir at a stirring speed of 100 r / min. After soaking, drain and place in an oven at 48 °C and dry for 12 h. After grinding through a 200 - mesh sieve, the obtained is the pulp base material.

[0009] Furthermore, in S1, the preparation steps of the hydrophobic base material are as follows: Step 1. Weigh 1 g of hydrochloric acid dopamine powder and dissolve it in 200 mL of Tris - HCl buffer solution to prepare a pre - modified solution. Immerse the pulp base material in the pre - modified solution at a material - to - liquid ratio of 1:5, soak at a temperature of 25 °C for 10 h. After soaking, drain and place in an oven at 45 °C and dry for 12 h. The obtained is denoted as the polydopamine - coated component. Step 2. Weigh 4 g of palm wax, 3 g of sodium dodecyl sulfate, and 3 g of sodium dioctyl sulfosuccinate, disperse them in an ethanol - aqueous solution with a mass fraction of 80%. Heat to 85 °C and stir at a stirring speed of 1000 r / min for 5 min. The obtained is denoted as the emulsion component. Step 3. Immerse the polydopamine - coated component in the emulsion component at a material - to - liquid ratio of 1:5, soak at a temperature of 50 °C for 12 h. After soaking, drain and place in an oven at 45 °C and dry for 12 h. The obtained is the hydrophobic base material.

[0010] Furthermore, in Step 1, the concentration of the Tris - HCl buffer solution is 0.02 mol / L, the pH value of the Tris - HCl buffer solution is 8.5. During the soaking process in Step 3, stir at a stirring speed of 300 r / min.

[0011] Furthermore, in S2, the preparation steps of the antibacterial starch component are as follows: Step A: Weigh 5 g of starch and disperse it in 95 g of deionized water. After uniform dispersion, add 3 - 4 g of propylene glycol diglycidyl ether. After mixing evenly, add sodium hydroxide solution to adjust the pH value to 11, and the obtained is denoted as the mixed component; Step B: Add 5 - 6 g of polyhexamethylene guanidine hydrochloride to the mixed component, and add hydrochloric acid solution to adjust the pH value to 7. After reacting at room temperature for 30 min, place it under rotary evaporation and concentration at 68 °C to half of the original volume, and the obtained is the antibacterial starch component.

[0012] Furthermore, in Step A, the specific operation of uniform dispersion is to stir at a stirring speed of 300 r / min for 10 min, the specific operation of uniform mixing is to stir at a stirring speed of 500 r / min for 10 min, the mass fraction of the sodium hydroxide solution is 20%, and in Step B, the mass fraction of the hydrochloric acid solution is 25%.

[0013] Furthermore, in S2, the preparation method of the antibacterial silica component is: Weigh 10 g of nano - silica and add it to 200 ml of absolute ethanol. Then add 2 - 3 g of didodecyldimethylammonium chloride, 1 - 2 g of dioctyldimethylammonium bromide, and 2 - 3 g of dodecyldimethylethylammonium bromide, and then perform ultrasonic dispersion. Then add 8 g of silane coupling agent KH - 560 and stir for reaction. Finally, place it in an oven at 55 °C and dry to constant weight, and the obtained is the antibacterial silica component.

[0014] Furthermore, in the preparation method of the antibacterial silica component, the specific operation of ultrasonic dispersion is to perform ultrasonic dispersion at a frequency of 28 kHz for 20 min, and the method of stirring reaction is to stir at a stirring speed of 200 r / min for 30 min for reaction.

[0015] Furthermore, in S2, the preparation steps of the water - and oil - repellent emulsion component are as follows: Step 1: Weigh 2 g of chitosan and add it to 100 g of acetic acid solution with a mass fraction of 1%. Stir at a stirring speed of 500 r / min for 4 h, and after standing overnight, the obtained is denoted as the chitosan component; Step 2: Heat the chitosan component to 75 °C, and add 5 g of alkyl ketene dimer in a molten state under stirring at a stirring speed of 1000 r / min. Continue to stir for 10 min and then quickly cool in ice water, and the obtained is the water - and oil - repellent emulsion component.

[0016] Furthermore, in S3, the specific operation of uniform mixing and dispersion is to stir at a stirring speed of 400 r / min for 10 min, and in S4, the method of uniform homogenization is to stir at a stirring speed of 500 r / min for 30 min.

[0017] Beneficial effects The present invention provides a method for preparing a pulp molded comb. Compared with the existing well-known technologies, the present invention has the following beneficial effects: 1. By treating the mixed wood pulp fibers and bamboo pulp fibers with an alkali solution, the present invention can improve the looseness of the fibers and the group activity on the fiber surface, which is beneficial to forming a dopamine cross-linking layer on the surface of the fibers where polydopamine is dispersed, enabling polydopamine to act as an adhesive to form a hydrophobic film of palm wax with hydrophobic effect on the fiber surface, thereby making the prepared pulp base material have better hydrophobicity. Secondly, the present invention uses hydrochloric acid polyhexamethyleneguanidine to modify starch and uses the modified starch in the preparation of pulp molded combs, which can endow the combs with antibacterial properties. This is of great significance for reducing the growth of bacteria during the use of combs and protecting the health of users. Moreover, the modified starch also has improved performance, which helps to enhance the durability of pulp molded combs and makes them less likely to be damaged or deformed during use. Finally, different types of quaternary ammonium salt antibacterial agents are adsorbed on the surface of silica to prepare an antibacterial silica component, which is used in the preparation of pulp molded combs, and can further improve the antibacterial performance of the combs.

[0018] 2. The present invention uses chitosan and alkyl ketene dimer as raw materials to prepare a waterproof and oil-proof emulsion component, which is used in the preparation of pulp molded combs. It can form a waterproof layer inside the paper to hinder the penetration and diffusion of moisture. After combining it with chitosan to prepare an emulsion component, it can further enhance the waterproof performance of pulp molded combs, making the combs less likely to be affected by moisture, deformed or damaged during use. In addition to the waterproof performance, alkyl ketene dimer also has certain oil-proof performance. When the comb comes into contact with oily substances, it can better keep its surface clean and dry, reducing the risk of oil penetration and contamination. Secondly, chitosan, as a natural polymer material, has high strength and toughness. Combining it with alkyl ketene dimer can further improve the mechanical strength of pulp molded combs, making the combs more durable and less likely to be damaged or broken during use. Both chitosan and alkyl ketene dimer have certain antioxidant and anti-ultraviolet properties. Combining the two can slow down the aging phenomenon of pulp molded combs caused by oxidation or ultraviolet irradiation during long-term use and extend the service life of the product. Specific embodiments

[0019] 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. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0020] The present invention will be further described below in conjunction with embodiments.

[0021] Embodiment 1

[0022] A preparation method of a pulp molded comb in this embodiment, the preparation method includes the following steps: S1. Prepare a pulp base material with different fibers as raw materials, and then modify the pulp base material with dopamine to prepare a hydrophobic base material; S2. Modify starch to prepare an antibacterial starch component, modify nano-silica to prepare an antibacterial silica component, and use chitosan and alkyl ketene dimer as raw materials to prepare a waterproof and oil-proof emulsion component; S3. Weigh 1 part by weight of the antibacterial starch component, 2 parts by weight of the antibacterial silica component, 2 parts by weight of polyvinyl alcohol and 1 part by weight of cationic polyacrylamide and disperse them in 100 parts by weight of deionized water. After mixing and dispersing evenly, the obtained is the antibacterial starch mixed solution; S4. Weigh 50 parts by weight of the hydrophobic base material, 6 parts by weight of the waterproof and oil-proof emulsion component and 15 parts by weight of the antibacterial starch mixed solution and mix and homogenize them. The obtained is the slurry component; S5. Pour the slurry component into a comb mold to form a mold blank, then press and mold it under the conditions of a temperature of 170 °C and a pressure of 40 MPa for 100 s, cool to room temperature and then place it in an oven at 68 °C and dry it for 30 min. The obtained is the pulp molded comb.

[0023] In S1, the preparation method of the pulp base material is: mix wood pulp fiber and bamboo pulp fiber according to an equal weight ratio, then pour them into a potassium hydroxide alkaline solution with a mass fraction of 8%, heat to 45 °C and soak at a constant temperature for 8 h. During the soaking process, stir at a stirring speed of 100 r / min. After soaking, drain and place it in an oven at 48 °C and dry it for 12 h. After grinding through a 200-mesh sieve, the obtained is the pulp base material.

[0024] In S1, the preparation steps of the hydrophobic base material are: Step 1. Weigh 1 g of hydrochloric acid dopamine powder and dissolve it in 200 mL of Tris-HCl buffer solution to prepare a pre-modified solution. Soak the pulp base material in the pre-modified solution according to a material-liquid ratio of 1:5, soak at a temperature of 25 °C for 10 h, drain after soaking and place it in an oven at 45 °C and dry it for 12 h. The obtained is denoted as the polydopamine-coated component; Step 2. Weigh 4 g of palm wax, 3 g of sodium dodecyl sulfate and 3 g of sodium dioctyl sulfosuccinate and disperse them in an ethanol aqueous solution with a mass fraction of 80%. Heat to 85 °C and stir at a stirring speed of 1000 r / min for 5 min. The obtained is denoted as the emulsion component; Step 3: Immerse the polydopamine-coated component in the emulsion component at a material-liquid ratio of 1:5, soak it at 50 °C for 12 h, drain it after soaking, and place it in an oven at 45 °C to dry for 12 h. The obtained product is the hydrophobic base material.

[0025] In Step 1, the concentration of the Tris-HCl buffer solution is 0.02 mol / L, and the pH value of the Tris-HCl buffer solution is 8.5. During the soaking process in Step 3, stir at a stirring speed of 300 r / min.

[0026] In S2, the preparation steps of the antibacterial starch component are as follows: Step A: Weigh 5 g of starch and disperse it in 95 g of deionized water. After dispersing evenly, add 3 g of propylene glycol diglycidyl ether, mix evenly, and then add sodium hydroxide solution to adjust the pH value to 11. The obtained product is denoted as the mixed component; Step B: Add 5 g of polyhexamethylene guanidine hydrochloride to the mixed component, and add hydrochloric acid solution to adjust the pH value to 7. After reacting at room temperature for 30 min, place it at 68 °C and rotary evaporate and concentrate to half of the original volume. The obtained product is the antibacterial starch component.

[0027] In Step A, the specific operation of dispersing evenly is to stir at a stirring speed of 300 r / min for 10 min, the specific operation of mixing evenly is to stir at a stirring speed of 500 r / min for 10 min, the mass fraction of the sodium hydroxide solution is 20%, and in Step B, the mass fraction of the hydrochloric acid solution is 25%.

[0028] In S2, the preparation method of the water and oil repellent emulsion component is as follows: Weigh 10 g of nano-silica and add it to 200 ml of absolute ethanol. Then add 2 g of didodecyldimethylammonium chloride, 1 g of dioctyldimethylammonium bromide, and 2 g of dodecyldimethylethylammonium bromide, and then perform ultrasonic dispersion. Then add 8 g of silane coupling agent KH-560 and stir to react. Finally, place it in an oven at 55 °C to dry to constant weight. The obtained product is the antibacterial silica component.

[0029] In the preparation method of the antibacterial silica component, the specific operation of ultrasonic dispersion is to perform ultrasonic dispersion at a frequency of 28 kHz for 20 min, and the method of stirring reaction is to stir at a stirring speed of 200 r / min for 30 min for reaction.

[0030] In S2, the preparation steps of the water and oil repellent emulsion component are as follows: Step 1: Weigh 2 g of chitosan and add it to 100 g of acetic acid solution with a mass fraction of 1%. Stir at a stirring speed of 500 r / min for 4 h, and let it stand overnight. The obtained product is denoted as the chitosan component; Step 2: Heat the chitosan component to 75°C, add 5 g of alkyl ketene dimer after melting by heating under the stirring condition with a stirring speed of 1000 r / min, continue stirring for 10 min, and then quickly cool it in ice water. The obtained product is the waterproof and oil-proof emulsion component.

[0031] In S3, the specific operation for uniformly mixing and dispersing is to stir at a stirring speed of 400 r / min for 10 min. In S4, the method for mixing and homogenizing is to stir at a stirring speed of 500 r / min for 30 min.

[0032] Example 2

[0033] A preparation method of a pulp molding comb in this example, the preparation method includes the following steps: S1: Prepare a pulp base material with different fibers as raw materials, and then modify the pulp base material with dopamine to prepare a hydrophobic base material; S2: Modify starch to prepare an antibacterial starch component, modify nano-silica to prepare an antibacterial nano-silica component, and use chitosan and alkyl ketene dimer as raw materials to prepare a waterproof and oil-proof emulsion component; S3: Weigh 2 parts by weight of the antibacterial starch component, 3 parts by weight of the antibacterial nano-silica component, 3 parts by weight of polyvinyl alcohol, and 2 parts by weight of cationic polyacrylamide, disperse them in 100 parts by weight of deionized water, and the obtained product after uniformly mixing and dispersing is the antibacterial starch mixed solution; S4: Weigh 60 parts by weight of the hydrophobic base material, 10 parts by weight of the waterproof and oil-proof emulsion component, and 20 parts by weight of the antibacterial starch mixed solution for mixing and homogenizing. The obtained product is the pulp component; S5: Pour the pulp component into a comb mold to form a mold blank, then press it for 100 s at a temperature of 170°C and a pressure of 40 MPa for molding, cool it to room temperature, and then place it in an oven at 68°C for drying for 30 min. The obtained product is the pulp molding comb.

[0034] In S1, the preparation method of the pulp base material is as follows: Mix wood pulp fibers and bamboo pulp fibers according to an equal weight ratio, then pour them into a potassium hydroxide alkali solution with a mass fraction of 8%, heat to 45°C and soak at a constant temperature for 8 h. During the soaking process, stir at a stirring speed of 100 r / min. After soaking, drain and place it in an oven at 48°C for drying for 12 h. After grinding through a 200-mesh sieve, the obtained product is the pulp base material.

[0035] In S1, the preparation steps of the hydrophobic base material are as follows: Step 1: Weigh 1 g of dopamine hydrochloride powder and dissolve it in 200 mL of Tris-HCl buffer solution to prepare a pre-modified solution. Immerse the pulp base material in the pre-modified solution according to a solid-liquid ratio of 1:5, soak it at 25 °C for 10 h, drain it after soaking, and place it in an oven at 45 °C for drying for 12 h. The obtained product is denoted as the polydopamine-coated component; Step 2: Weigh 4 g of palm wax, 3 g of sodium dodecyl sulfate, and 3 g of sodium dioctyl sulfosuccinate, disperse them in an ethanol aqueous solution with a mass fraction of 80%, heat it to 85 °C, and stir it at a stirring speed of 1000 r / min for 5 min. The obtained product is denoted as the emulsion component; Step 3: Immerse the polydopamine-coated component in the emulsion component according to a solid-liquid ratio of 1:5, soak it at 50 °C for 12 h, drain it after soaking, and place it in an oven at 45 °C for drying for 12 h. The obtained product is the hydrophobic base material.

[0036] In Step 1, the concentration of the Tris-HCl buffer solution is 0.02 mol / L, and the pH value of the Tris-HCl buffer solution is 8.5. During the soaking process in Step 3, stir it at a stirring speed of 300 r / min.

[0037] In S2, the preparation steps of the antibacterial starch component are as follows: Step A: Weigh 5 g of starch and disperse it in 95 g of deionized water. After dispersing evenly, add 4 g of propylene glycol diglycidyl ether, mix evenly, and then add sodium hydroxide solution to adjust the pH value to 11. The obtained product is denoted as the mixed component; Step B: Add 6 g of polyhexamethylene guanidine hydrochloride to the mixed component, and add hydrochloric acid solution to adjust the pH value to 7. After reacting at room temperature for 30 min, place it in a rotary evaporator at 68 °C to concentrate it to half of the original volume. The obtained product is the antibacterial starch component.

[0038] In Step A, the specific operation of dispersing evenly is to stir at a stirring speed of 300 r / min for 10 min, the specific operation of mixing evenly is to stir at a stirring speed of 500 r / min for 10 min, the mass fraction of the sodium hydroxide solution is 20%, and in Step B, the mass fraction of the hydrochloric acid solution is 25%.

[0039] In S2, the preparation method of the antibacterial silica component is: Weigh 10 g of nano-silica and add it to 200 ml of anhydrous ethanol. Then add 3 g of didodecyldimethylammonium chloride, 2 g of dioctyldimethylammonium bromide, and 3 g of dodecyldimethylethylammonium bromide, and then perform ultrasonic dispersion. Then add 8 g of silane coupling agent KH-560 and stir to react. Finally, place it in an oven at 55 °C to dry to constant weight. The obtained product is the antibacterial silica component.

[0040] In the preparation method of the antibacterial silica component, the specific operation of ultrasonic dispersion is to perform ultrasonic dispersion at a frequency of 28 kHz for 20 min, and the method of stirring reaction is to perform the reaction by stirring at a stirring speed of 200 r / min for 30 min.

[0041] In S2, the preparation steps of the water-proof and oil-proof emulsion component are as follows: Step 1: Weigh 2 g of chitosan and add it to 100 g of acetic acid solution with a mass fraction of 1%, stir at a stirring speed of 500 r / min for 4 h, and the obtained product after standing overnight is denoted as the chitosan component; Step 2: Heat the chitosan component to 75 °C, add 5 g of alkyl ketene dimer after heating and melting under the stirring condition with a stirring speed of 1000 r / min, continue to stir for 10 min, and then quickly cool it in ice water. The obtained product is the water-proof and oil-proof emulsion component.

[0042] In S3, the specific operation of mixing and dispersing evenly is to stir at a stirring speed of 400 r / min for 10 min. In S4, the method of mixing and homogenizing is to stir at a stirring speed of 500 r / min for 30 min.

[0043] Example 3

[0044] A preparation method of a pulp molding comb in this example, the preparation method includes the following steps: S1: Prepare a pulp base material with different fibers as raw materials, and then modify the pulp base material with dopamine to prepare a hydrophobic base material; S2: Modify starch to prepare an antibacterial starch component, modify nano-silica to prepare an antibacterial silica component, and use chitosan and alkyl ketene dimer as raw materials to prepare a water-proof and oil-proof emulsion component; S3: Weigh 2 parts by weight of the antibacterial starch component, 3 parts by weight of the antibacterial silica component, 2 parts by weight of polyvinyl alcohol and 2 parts by weight of cationic polyacrylamide, disperse them in 100 parts by weight of deionized water, and the obtained product after mixing and dispersing evenly is the antibacterial starch mixed solution; S4: Weigh 55 parts by weight of the hydrophobic base material, 8 parts by weight of the water-proof and oil-proof emulsion component and 18 parts by weight of the antibacterial starch mixed solution for mixing and homogenizing. The obtained product is the pulp component; S5: Pour the pulp component into a comb mold to form a mold blank, then press and mold it under the conditions of a temperature of 170 °C and a pressure of 40 MPa for 100 s, cool it to room temperature, and then dry it in an oven at 68 °C for 30 min. The obtained product is the pulp molding comb.

[0045] In S1, the preparation method of the pulp base material is as follows: Mix wood pulp fibers and bamboo pulp fibers in an equal weight ratio, then pour them into a potassium hydroxide alkali solution with a mass fraction of 8%, heat to 45 °C and soak for 8 h at a constant temperature. During the soaking process, stir at a stirring speed of 100 r / min. After soaking, drain and place in an oven at 48 °C for drying for 12 h. After grinding through a 200-mesh sieve, the obtained material is the pulp base material.

[0046] In S1, the preparation steps of the hydrophobic base material are as follows: Step 1: Weigh 1 g of dopamine hydrochloride powder and dissolve it in 200 mL of Tris-HCl buffer solution to prepare a pre-modified solution. Immerse the pulp base material in the pre-modified solution according to a material-liquid ratio of 1:5, soak at a temperature of 25 °C for 10 h. After soaking, drain and place in an oven at 45 °C for drying for 12 h. The obtained product is denoted as the polydopamine-coated component. Step 2: Weigh 4 g of palm wax, 3 g of sodium dodecyl sulfate, and 3 g of sodium dioctyl sulfosuccinate and disperse them in an ethanol aqueous solution with a mass fraction of 80%. Heat to 85 °C and stir at a stirring speed of 1000 r / min for 5 min. The obtained product is denoted as the emulsion component. Step 3: Immerse the polydopamine-coated component in the emulsion component according to a material-liquid ratio of 1:5, soak at a temperature of 50 °C for 12 h. After soaking, drain and place in an oven at 45 °C for drying for 12 h. The obtained product is the hydrophobic base material.

[0047] In Step 1, the concentration of the Tris-HCl buffer solution is 0.02 mol / L, and the pH value of the Tris-HCl buffer solution is 8.5. During the soaking process in Step 3, stir at a stirring speed of 300 r / min.

[0048] In S2, the preparation steps of the antibacterial starch component are as follows: Step A: Weigh 5 g of starch and disperse it in 95 g of deionized water. After dispersing evenly, add 4 g of propylene glycol diglycidyl ether, mix evenly, and then dropwise add sodium hydroxide solution to adjust the pH value to 11. The obtained product is denoted as the mixed component. Step B: Add 5 g of polyhexamethylene guanidine hydrochloride to the mixed component, and dropwise add hydrochloric acid solution to adjust the pH value to 7. React at room temperature for 30 min, and then place it at a temperature of 68 °C for rotary evaporation and concentration to half of the original volume. The obtained product is the antibacterial starch component.

[0049] In Step A, the specific operation of dispersing evenly is to stir at a stirring speed of 300 r / min for 10 min, the specific operation of mixing evenly is to stir at a stirring speed of 500 r / min for 10 min, the mass fraction of the sodium hydroxide solution is 20%, and in Step B, the mass fraction of the hydrochloric acid solution is 25%.

[0050] In S2, the preparation method of the antibacterial silica component is as follows: Weigh 10 g of nano-silica and add it to 200 ml of absolute ethanol. Then add 3 g of didodecyldimethylammonium chloride, 2 g of dioctyldimethylammonium bromide, and 2 g of dodecyldimethylethylammonium bromide, followed by ultrasonic dispersion. Then add 8 g of silane coupling agent KH-560 and stir for reaction. Finally, place it in an oven at 55 °C and dry to a constant weight. What is obtained is the antibacterial silica component.

[0051] In the preparation method of the antibacterial silica component, the specific operation of ultrasonic dispersion is to perform ultrasonic dispersion at a frequency of 28 kHz for 20 min, and the method of stirring reaction is to stir at a stirring speed of 200 r / min for 30 min for reaction.

[0052] In S2, the preparation steps of the water-proof and oil-proof emulsion component are as follows: Step 1: Weigh 2 g of chitosan and add it to 100 g of acetic acid solution with a mass fraction of 1%. Stir at a stirring speed of 500 r / min for 4 h, and let it stand overnight. What is obtained is denoted as the chitosan component; Step 2: Heat the chitosan component to 75 °C, and add 5 g of alkyl ketene dimer in a molten state under the stirring condition with a stirring speed of 1000 r / min. Continue to stir for 10 min and then quickly cool it in ice water. What is obtained is the water-proof and oil-proof emulsion component.

[0053] In S3, the specific operation of mixing and dispersing evenly is to stir at a stirring speed of 400 r / min for 10 min. In S4, the method of mixing and homogenizing is to stir at a stirring speed of 500 r / min for 30 min.

[0054] Comparative Example 1

[0055] The preparation method of a pulp molding comb provided in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 1, the hydrophobic base material in Example 1 is replaced with a pulp base material.

[0056] Comparative Example 2

[0057] The preparation method of a pulp molding comb provided in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 2, the antibacterial starch component in Example 1 is replaced with unmodified starch.

[0058] Comparative Example 3

[0059] The preparation method of a pulp molding comb provided in this comparative example is generally the same as that in Example 1. The main difference is that in this Comparative Example 3, the antibacterial silica component in Example 1 is replaced with unmodified nano-silica.

[0060] Performance Test

[0061] The pulp molded combs in Examples 1-3 and Comparative Examples 1-3 were respectively labeled as Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3, and then the performances of Examples 1-3 and Comparative Examples 1-3 were detected, and the obtained data were recorded in the following table:

[0062] It can be seen from the data in the above table that the pulp molded combs in Examples 1-3 of the present invention have better hydrophobic and antibacterial properties compared with Comparative Examples 1-3, indicating that the hydrophobic base material, antibacterial starch component, and antibacterial silica component added in the present invention can enhance the water-based and antibacterial properties of the pulp molded combs. In summary, the pulp molded combs prepared by the preparation method of a pulp molded comb in the present invention have excellent market promotion value.

[0063] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a pulp molded comb, characterized in that: The preparation method comprises the following steps: S1. preparing a pulp base material using different fibers as raw materials, and then modifying the pulp base material with dopamine to prepare a hydrophobic base material; S2, modifying starch to prepare an antibacterial starch component, modifying nano-silicon dioxide to prepare an antibacterial silicon dioxide component, and using chitosan and alkyl ketene dimer as raw materials to prepare a waterproof and oil-proof emulsion component; S3, weighing 1-2 parts by weight of the antibacterial starch component, 2-3 parts by weight of the antibacterial silicon dioxide component, 2-3 parts by weight of polyvinyl alcohol and 1-2 parts by weight of cationic polyacrylamide, dispersing them in 100 parts by weight of deionized water, and mixing and dispersing them uniformly to obtain the antibacterial starch mixed solution; S4, weighing 50-60 parts by weight of the hydrophobic base material, 6-10 parts by weight of the waterproof and oil-proof emulsion component and 15-20 parts by weight of the antibacterial starch mixed solution, mixing and homogenizing, and the obtained mixture is the slurry component; S5. Pour the slurry components into a comb mold to form a mold, then pressurize it for 100 seconds at a temperature of 170°C and a pressure of 40 MPa to form it, cool it to room temperature, and then dry it in an oven at 68°C for 30 minutes to obtain a pulp molded comb.

2. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S1, the preparation method of the pulp base material is: wood pulp fiber and bamboo pulp fiber are mixed in an equal weight ratio, then poured into an 8% by mass potassium hydroxide alkaline solution, heated to 45°C and soaked at a constant temperature for 8 hours, stirred at a stirring speed of 100 r / min during the soaking process, drained after the soaking and placed in an oven at 48°C for 12 hours, and the obtained pulp is ground through a 200-mesh sieve to obtain the pulp base material.

3. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S1, the preparation steps of the hydrophobic base are: Step 1, weigh 1g of dopamine hydrochloride powder and dissolve it in 200mL of Tris-HCl buffer to prepare a pre-modified solution, soak the pulp base material in the pre-modified solution at a solid-liquid ratio of 1:5, soak it at a temperature of 25°C for 10 hours, drain it after soaking and place it in an oven at 45°C for 12 hours, and the result is recorded as a polydopamine encapsulated component; Step 2, weigh 4g palm wax, 3g sodium dodecyl sulfate and 3g sodium dioctyl succinate sulfonate, disperse them in an ethanol aqueous solution with a mass fraction of 80%, heat to 85°C, and stir at a stirring speed of 1000r / min for 5min. The obtained mixture is recorded as the emulsion component; Step 3, soak the polydopamine-wrapped component in the emulsion component at a solid-liquid ratio of 1:5 at 50°C for 12 hours, drain and dry in an oven at 45°C for 12 hours, and the result is a hydrophobic base material.

4. The method for preparing a pulp molded comb according to claim 3, characterized in that: In step 1, the concentration of the Tris-HCl buffer solution is 0.02 mol / L, and the pH value of the Tris-HCl buffer solution is 8.

5. During the soaking process in step 3, stirring is performed at a stirring speed of 300 r / min.

5. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S2, the preparation steps of the antibacterial starch component are: Step A, weigh 5g of starch and disperse it in 95g of deionized water. After the dispersion is uniform, add 3-4g of propylene glycol diglycidyl ester, mix well, and then dropwise add sodium hydroxide solution to adjust the pH value to 11. The result is recorded as a mixed component; Step B, add 5-6g of polyhexamethyleneguanidine hydrochloride to the mixed components, and add hydrochloric acid solution dropwise to adjust the pH value to 7. After reacting at room temperature for 30 minutes, place it at 68°C and concentrate it by rotary evaporation to half of the original volume, and the obtained antibacterial starch component is obtained.

6. The method for preparing a pulp molded comb according to claim 5, characterized in that: In step A, the specific operation for uniform dispersion is stirring at a stirring speed of 300 r / min for 10 min, and the specific operation for uniform mixing is stirring at a stirring speed of 500 r / min for 10 min. The mass fraction of the sodium hydroxide solution is 20%. In step B, the mass fraction of the hydrochloric acid solution is 25%.

7. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S2, the preparation method of the antibacterial silica component is: weigh 10g of nano-silica and add it to 200ml of anhydrous ethanol, then add 2-3g of didecyldimethylammonium chloride, 1-2g of dioctyldimethylammonium bromide and 2-3g of dodecyldimethylethylammonium bromide and ultrasonically disperse them, then add 8g of silane coupling agent KH-560 and stir to react, finally place it in an oven at 55°C and dry it to constant weight, and the result is the antibacterial silica component.

8. The method for preparing a pulp molded comb according to claim 7, characterized in that: In the preparation method of the antibacterial silica component, the specific operation of ultrasonic dispersion is ultrasonic dispersion at a frequency of 28 kHz for 20 minutes, and the method of stirring reaction is stirring at a stirring speed of 200 r / min for 30 minutes for reaction.

9. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S2, the preparation steps of the waterproof and oil-proof emulsion component are: Step 1, weigh 2g of chitosan and add it to 100g of 1% acetic acid solution, stir at a stirring speed of 500r / min for 4h, and let it stand overnight to obtain the chitosan component; Step 2: Heat the chitosan component to 75° C., then add 5 g of the heated and melted alkyl ketene dimer at a stirring speed of 1000 r / min, continue stirring for 10 min, and then quickly cool in ice water to obtain a waterproof and oil-proof emulsion component.

10. The method for preparing a pulp molded comb according to claim 1, characterized in that: In S3, the specific operation of mixing and dispersing uniformly is stirring at a stirring speed of 400 r / min for 10 min. In S4, the method of mixing and homogenizing is stirring at a stirring speed of 500 r / min for 30 min.

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