A kind of preparation method of low crystallinity nano cellulose
A technology of nano-cellulose and low crystallinity, applied in fiber raw material processing, textiles and papermaking, etc., can solve the unseen problems of cellulose preparation and application, and achieve good technical support, no quality loss, and high yield Effect
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Embodiment 1
[0038] A method for preparing low crystallinity nanocellulose, comprising the steps:
[0039] (1) 4g of microcrystalline cellulose was added to 100g of 64% sulfuric acid solution, reacted for 45min at 45°C in an oil bath, and the stirring speed was 400r / min. After the reaction, a high-speed centrifuge was used to remove a large amount of water by water exchange / centrifugation cycle. Then, the obtained suspension was dialyzed with deionized water until the pH was 6 to 7 to obtain a nanocellulose suspension (solid content of 1 to 3 wt%); the obtained nanocellulose suspension was subjected to solvent replacement , to obtain nanocellulose DMSO suspension; wherein the mass ratio of nanocellulose to DMSO is 1:110, swelling at room temperature for 4h, and stirring speed is 400r / min;
[0040] (2) Mixing the nanocellulose DMSO suspension obtained in step (1) with an aqueous solution of TBAH with a mass fraction of 40%; wherein TBAH / DMSO / H 2 The volume ratio of O was 5:110:7.5, and the...
Embodiment 2
[0043] Adjust TBAH / DMSO / H in Example 1 2 The volume of O is as shown in Table 1, and the others are the same as those in Example 1, to obtain a low-crystallinity nanocellulose aqueous suspension and a low-crystallinity nanocellulose powder.
[0044] The obtained low-crystallinity nanocellulose aqueous suspension and low-crystallinity nanocellulose powder are tested for performance, and the test results are as follows in Table 1:
[0045] The test result of table 1 embodiment 2
[0046] TBAH / DMSO / H 2 O volume ratio
[0047] Note: The apparent viscosity is that the solid content of the suspension is 2wt%, and the shear rate is 0.01s -1 The apparent viscosity below.
Embodiment 3
[0049] The organic reagents in Example 1 were adjusted to be DMSO, DMF and DMAc, and the others were the same as those of Example 1 to obtain low-crystallinity nanocellulose.
[0050] The obtained low crystallinity nanocellulose aqueous suspension and low crystallinity nanocellulose powder are carried out performance test, and the test results are as follows in Table 2:
[0051] The test data of table 2 embodiment 3
[0052] mixed solvent Crystallinity (%) Apparent viscosity (Pa s) Zeta potential (mV) TBAH / DMF / H 2 O
[0053] Note: The apparent viscosity is that the solid content of the suspension is 2wt%, and the shear rate is 0.01s -1 The apparent viscosity below.
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