Preparation method of super-hydrophobic magnetic nano-crystalline cellulose paper
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A nano-cellulose and magnetic nano-technology, applied in the use of microorganisms/enzyme cellulose treatment, non-fibrous pulp addition, fiber raw material treatment, etc., can solve the problems of non-magnetic, poor hydrophobic effect of nano-paper, etc.
Active Publication Date: 2016-06-15
SHANDONG AGRICULTURAL UNIVERSITY
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[0006] The purpose of the present invention is to provide a method for preparing superhydrophobic magnetic nano-cellulose paper in order to solve the technical problems of poor hydrophobicity and non-magnetic properties of the nano-paper prepared by the existing method
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specific Embodiment approach 1
[0037] Specific embodiment one: the preparation method of superhydrophobic magnetic nano-cellulose paper in this embodiment is carried out according to the following steps:
[0038] 1. Preparation of nanocellulose aqueous solution:
[0039] Add purified cellulose into a 250ml beaker, add deionized water to a mass concentration of 0.1%-0.3%, add 2g of cellulase, pretreat at 50°C for 2h, then treat at 90°C for 2h, then vacuum filter After washing with water, reconstitute the water solution with a mass concentration of 0.1%-0.3%, and then undergo a 600bar high-pressure homogenization mechanical treatment for 30 minutes to obtain the nanocellulose water solution;
[0040] Or put purified cellulose into a 250ml beaker, add deionized water to a mass concentration of 0.1%-0.3%, add 0.1g sodium bromide, 0.016g TEMPO reagent in turn, and add 5ml of 12% TEMPO reagent under magnetic stirring Sodium hypochlorite solution, add the sodium hydroxide that concentration is 0.5mol / L again, adj...
specific Embodiment approach 2
[0047] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the magnetic nanoparticles described in step two are magnetic Fe 3 o 4 Nanoparticles or NanoFe 3 o 4 Granular and Nano SiO 2 composite of particles. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0048] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the surfactant described in step 2 is cetyl trimethyl ammonium bromide, cetyl trimethyl ammonium chloride , octadecyltrimethylammonium bromide or any combination of one or more of octadecyltrimethylammonium chloride. Others are the same as those in the first or second embodiment.
[0049] When the surfactant described in this embodiment is a composition, the ratio between the respective components is arbitrary.
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Abstract
The invention discloses a preparation method of super-hydrophobic magnetic nano-crystalline cellulose paper, relates to a preparation method of magnetic nano-crystalline cellulose paper, and aims to solve the technical problems of poor hydrophobic effect and no magnetism of nano paper prepared by an existing method. The method comprises the following steps: 1, preparation of nano-crystalline cellulose water liquid; 2, preparation of nano-crystalline cellulose-magnetic nanoparticle mixed liquor; 3, preparation of a hydrophobic substance; 4, suction filtration film-forming of magnetic nano-crystalline cellulose; 5, preparation of the super-hydrophobic magnetic nano-crystalline cellulose paper. The super-hydrophobic magnetic nano-crystalline cellulose paper prepared by the method has the characteristics that the hydrophobic contact angle can reach up to 150 degrees or more, the rolling angle is less than 10 degrees, the magnetic intensity can reach 60emu/g, the stretching stress can reach 90MPa, and the maximal pyrolysis temperature can reach 360 DEG C. The preparation method belongs to the field of nano-crystalline cellulose paper preparation.
Description
technical field [0001] The invention relates to a preparation method of magnetic nano cellulose paper. Background technique [0002] Nanocellulose has the advantages of wide source of raw materials, high strength, large specific surface area, good biocompatibility, biodegradability, renewable recycling, etc. Micron-scale, small diameter, large aspect ratio, so that it shows high mechanical properties, Young's modulus and tensile strength are 13GPa and 223MPa respectively; in addition, it also has a low thermal expansion coefficient (CTE<8.5ppmK -1 ). These remarkable properties make it possible to make nanocellulose film paper for high-end fields such as packaging, electronic speakers, and microfluidic chips. [0003] However, the surface of nanocellulose contains a large number of functional groups - hydroxyl groups, which are very easy to absorb water, resulting in high water absorption of nanocellulose paper, and nanocellulose paper itself has no magnetic function, s...
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