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A kind of modification method of nanocellulose crystal viscoelasticity

A nanocellulose and viscoelastic technology, applied in the field of modification of nanocellulose crystals, can solve problems such as the reduction of nanocellulose crystals

Active Publication Date: 2019-05-10
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for modifying the viscoelasticity of nanocellulose crystals, which is simple, does not destroy the structure of nanocellulose crystals, improves viscoelasticity, does not affect the use of nanocellulose crystals in the later stage, and avoids the use of nanofibers. The problem that the prime crystal cannot achieve the final purpose due to the decrease of viscoelasticity when used

Method used

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  • A kind of modification method of nanocellulose crystal viscoelasticity
  • A kind of modification method of nanocellulose crystal viscoelasticity
  • A kind of modification method of nanocellulose crystal viscoelasticity

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preparation example Construction

[0038] Preparation of nanocellulose:

[0039] Straw cellulose is passed through a 20-mesh sieve, and dispersed in 65% (w / w) H 2 SO 4 In the solution, ultrasonic treatment (40 KHz, 30 s) was performed for 90 minutes under the condition of a constant temperature water bath at 45° C., during which time stirring was performed at 100 r / min. The reaction was terminated with 10 times the volume of acid solution in deionized water. A milky white suspension was obtained, centrifuged at 12000 r / min, 15 min each time, until the precipitate was washed with water to pH=7, and the supernatant was removed to obtain a stable cellulose colloid. Then disperse the precipitate with deionized water and redisperse it by ultrasonic wave (40KHz, 30s). Pour the dispersion liquid into a plate to freeze in a -20°C refrigerator for 24h, and freeze-dry at -70°C for 48h to obtain powdered nanocellulose crystals.

[0040] Described measuring method is as follows:

[0041] Determination of shear viscosit...

Embodiment 1

[0046] Preparation of nanocellulose crystal suspensions with different concentrations of glycerol:

[0047] The NCC of certain quality is dispersed in the 10Ml glycerol solution, is made into the suspension of 6% (w / v) NCC, and the glycerol solution mass distribution is as follows:

[0048] 10% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 1g glycerol and 9ml deionized water mixture;

[0049] 20% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 2g glycerol and 8ml deionized water mixture;

[0050] 30% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 3g glycerol and 7ml deionized water mixture;

[0051] 40% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0052] 50% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 5g glycerol and 5ml deionized water mixture;

[0053] 60% (w / w) glycerol NCC suspension: 0.6g NCC is dispersed into 6g glycerol and 4ml deionized water mixture;

[0054]...

Embodiment 2

[0058] Preparation of glycerol suspensions with different concentrations of nanocellulose crystals:

[0059] A certain quality of NCC is dispersed in 10mL glycerol solution, and is made into the NCC suspension of 40% (w / w) glycerol, and the NCC mass distribution is as follows:

[0060] 2% (w / v) NCC glycerol suspension: 0.2g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0061] 4% (w / v) NCC glycerol suspension: 0.4g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0062] 6% (w / v) NCC glycerol suspension: 0.6g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0063] 8% (w / v) NCC glycerol suspension: 0.8g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0064] 10% (w / v) NCC glycerin suspension: 1.0g NCC is dispersed into 4g glycerol and 6ml deionized water mixture;

[0065] Then, ultrasonically disperse at room temperature (10min, 40KHZ).

[0066] From figure 2 It can be seen from the figure th...

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Abstract

The invention discloses a cellulose nano-crystal viscoelasticity modifying method, belongs to the field of cellulose nano-crystal modifying methods, and concretely discloses an application of glycerin or a glycerin and sodium chloride combination in improvement of the viscoelasticity of cellulose nano-crystals. The modifying method concretely comprises the following steps: dispersing sodium chloride with the mass / volume fraction (g / ml) of 2%, 4%, 6% or 8% and NCC with the mass / volume fraction (g / ml) of 6% in an aqueous glycerin solution with the mass / volume fraction (g / ml) of 0.4%, and carrying out ultrasonic treatment at room temperature under 40 KHZ for 10 min for dispersion. The method is simple, does not destroy the structure of the cellulose nano-crystals, improves the viscoelasticity, has no influences on the later use of the cellulose nano-crystals, and solves the problem of unable reaching of the final purpose due to reduction of the viscoelasticity of the cellulose nano-crystals in use.

Description

technical field [0001] The invention relates to a method for modifying nano-cellulose crystals, in particular to a method for modifying the viscoelasticity of nano-cellulose crystals. Background technique [0002] Nanocellulose crystals have strong mechanical properties due to their unique rod-like structure, strength, and interfacial interaction. Therefore, nanocellulose crystals are ideal reinforcing agents for green materials such as starch-based films. At the same time, due to the nano effect of nanocellulose crystals, it has a large specific surface area and a large amount of surface charge, and the properties of nanomaterials are easily affected by the external environment due to surface charges and other reasons. Contents of the invention [0003] The purpose of the present invention is to provide a method for modifying the viscoelasticity of nanocellulose crystals, which is simple, does not destroy the structure of nanocellulose crystals, improves viscoelasticity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08K5/053C08K3/16C08J5/18
CPCC08J5/18C08J2301/04C08K3/16C08K5/053C08L2203/16C08L1/04
Inventor 孙庆杰熊柳秦洋吴旻葛胜菊常然然
Owner QINGDAO AGRI UNIV
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