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Preparation method for cellulose crystal susceptible to re-dispersion after drying

A cellulose crystal and redispersion technology, which is applied in the field of preparation of cellulose crystals, can solve the problems of not providing a specific method for surfactant surface activity, not describing nano-cellulose crystals, complex processes, etc., and achieving a simple and easy preparation method , low toxicity and strong controllability

Inactive Publication Date: 2013-09-04
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Deficiencies in the literature: no specific method for choosing which type of surfactant to choose and adding surfactant
[0010] Its disadvantages: the use of freeze-dried NCC, high energy consumption
[0012] Its disadvantages: the process is more complicated, freeze-dried NCC, and the energy consumption is higher
[0014] Its shortcoming: there is no description of which dryer is used to dry the carboxymethylated modified nanocellulose crystals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A kind of preparation method of the easily redispersible cellulose crystal after drying, its operation is as follows:

[0059] NCC with an average length of 152nm and a width of 3-5nm produced by enzyme treatment combined with acid hydrolysis of softwood dissolving pulp;

[0060] Use dodecyl glucoside (APG, molecular formula C 18 h 36 o 6 );

[0061] Weigh 1.0-3kg NCC, and weigh 2kg NCC in this embodiment, and use deionized water to prepare an NCC suspension with a concentration of 2wt%;

[0062] Weigh 40g to 60g of APG, and weigh 50g of APG in this example, and use deionized water to make a 1wt% APG aqueous solution;

[0063] Put the above 2wt% NCC suspension and 1wt% APG aqueous solution in the reaction kettle, at a temperature of 10°C to 50°C, the temperature of this example is designed to be 20°C for mixing and stirring, and the stirring time is 0.5h to 10h. For example, the stirring time is designed to be 2 hours, and the NCC suspension material is obtained af...

Embodiment 2

[0080] A kind of preparation method of the easily redispersible cellulose crystal after drying, its preparation step is identical with embodiment 1, only difference is:

[0081] The selected cellulose crystals are NFC obtained by mechanical treatment combined with acid hydrolysis of softwood dissolving pulp, with an average length of 626nm and a width of 10-20nm;

[0082] The selected non-ionic surfactant is polyethylene glycol (PEG, molecular weight 600), molecular formula: HO(CH 2 CH 2 O) n H;

[0083] Weigh 0.5-2.5kg NFC, this embodiment weighs 0.5kg NFC, and use distilled water to prepare NFC suspension with 1wt% concentration;

[0084] Weigh 10-100g of PEG600, this embodiment is designed to weigh 50g of PEG600, and prepare 1wt% PEG600 aqueous solution with distilled water;

[0085] Put the above 1wt% concentration of NFC suspension and 1wt% PEG600 aqueous solution in a reaction kettle, and stir and mix at a temperature of 10°C to 50°C. The temperature design of this e...

Embodiment 3

[0095] A kind of preparation method of the easily redispersible cellulose crystal after drying, its preparation step is identical with embodiment 1, only difference is:

[0096] The selected cellulose crystals are NCC produced by enzymatic treatment and acid hydrolysis of bleached hardwood kraft dissolving pulp, with an average length of 206nm and a width of 5-8nm;

[0097] The nonionic surfactant selected is polypropylene glycol 1000 (PPG, molecular weight is 1000), molecular formula: (C 3 h 6 O)n;

[0098] Weigh 0.5-2.5kg NFC, this embodiment weighs 2.0kg NFC, and use distilled water to make NFC suspension with 2wt% concentration;

[0099] Weigh 40-80g of PPG 1000, and weigh 60g of PPG 1000 in this example, and prepare 1wt% PPG 1000 aqueous solution with distilled water;

[0100] Put the above-mentioned 2wt% concentration of NCC suspension and 1wt% PPG 1000 aqueous solution in the reaction kettle, at a temperature of 10°C to 50°C, the temperature design of this example is...

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Abstract

The invention discloses a preparation method for a cellulose crystal susceptible to re-dispersion after drying, which comprises selection and using for cellulose crystal materials and non-ionic surface active agents; and a preparing and drying processing method for cellulose crystal suspending liquid materials, wherein the cellulose crystal materials comprise different types of cellulose crystals obtained by different cellulose sources and different processing methods; and the non-ionic surface active agents are APG, poly ethylene glycol, and polypropylene glycol. The preparation method comprises the following steps: mixing and stirring one of the non-ionic surface active agents and one of cellulose crystal suspending liquid to obtain the cellulose crystal suspending liquid materials; the cellulose crystal suspending liquid materials are subjected to drying processing by a fluid bed dryer or a spray dryer to obtain granulated, particulate, or powdered cellulose crystals which can disperse in an aqueous phase system quickly; and obtaining a particle size distribution, which can maintain original properties of the cellulose crystals, is similar to that of the original cellulose crystals after re-dispersing. Therefore, the cellulose crystals capable of re-dispersion provide convenience for the storage, the transportation, and the follow-up application.

Description

technical field [0001] The invention relates to a method for preparing cellulose crystals which are easily redispersed after drying. Background technique [0002] Cellulose is the most widely sourced renewable natural polymer in nature, which consists of nematic ordered crystalline regions and disordered amorphous regions. After acid hydrolysis, enzyme hydrolysis, and mechanical treatment, the amorphous region is degraded in large quantities, and micron-sized and nano-sized cellulose crystal materials can be obtained. [0003] Cellulose crystal materials, including micron cellulose crystals and nano cellulose crystals, wherein: [0004] Micron cellulose crystals include Microcrystalline cellulose (MCC) and Microfibrillated cellulose (MFC). Among them, MCC is mainly produced by acid hydrolysis, and MFC is mainly produced by mechanical treatment. Nanocellulose can be divided into nanocrystalline cellulose (Nano crystalline Cellulose, NCC), nano cellulose whisker (Nano crys...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08J3/05C08L1/02
Inventor 温文兵程栋倪永浩朱旭海安兴业江新超
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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