WO2021237382A1 - 一种制备制备竹浆纳米纤维素的方法 - Google Patents

一种制备制备竹浆纳米纤维素的方法 Download PDF

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WO2021237382A1
WO2021237382A1 PCT/CN2020/091950 CN2020091950W WO2021237382A1 WO 2021237382 A1 WO2021237382 A1 WO 2021237382A1 CN 2020091950 W CN2020091950 W CN 2020091950W WO 2021237382 A1 WO2021237382 A1 WO 2021237382A1
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ultrasonic
nanocellulose
parts
solution
bamboo pulp
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PCT/CN2020/091950
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谢超
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海门茂发美术图案设计有限公司
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Publication of WO2021237382A1 publication Critical patent/WO2021237382A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00—Preparation of compounds containing saccharide radicals
    • C12P19/04—Polysaccharides, i.e. compounds containing more than five saccharide radicals attached to each other by glycosidic bonds
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P19/00—Preparation of compounds containing saccharide radicals
    • C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase

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  • the invention relates to a method for preparing bamboo pulp nano cellulose.
  • Nanocellulose refers to a cellulose material with at least one-dimensional spatial dimension of the nanometer level. It not only has the basic structure and properties of cellulose, but also has the characteristics of nanoparticles that are different from natural cellulose. First, compared with natural cellulose, it has very high strength, Young's modulus and tensile stress. Secondly, its strong surface chemical reaction activity makes it suitable for chemical modification of cellulose; because its aqueous suspension is a stable colloidal liquid, it can be used as a pharmaceutical excipient; nano-cellulose gum can withstand high and low temperatures , It has the effect of emulsification and thickening, and can also be used as a food additive.
  • the preparation of nanocellulose mainly includes chemical, physical and biological methods.
  • the traditional chemical method to prepare nanocellulose uses acid hydrolysis. Hydrogen ions enter the inside of the cellulose to break the ⁇ -1,4-glycosidic bond in the cellulose structure. This is highly corrosive to the equipment and difficult to recover and process reaction residues.
  • Nanodia China is a big bamboo country, and its bamboo production ranks first in the world.
  • bamboo has strong renewability, and the extraction of nano-cellulose from bamboo pulp is of great significance for the efficient use of renewable agricultural and forestry by-products and environmental protection.
  • Cellulase hydrolysis is the use of cellulase to selectively enzymatically hydrolyze the amorphous and imperfect crystalline regions of cellulose, and finally obtain nanocellulose.
  • Enzymatic hydrolysis is a green process with low energy consumption, which can not only improve the quality and purity of the product, but also reduce the amount of chemicals, with less environmental pollution, more specific reactions, mild reaction conditions, and good nanocellulose performance.
  • combining mechanical treatment or acid hydrolysis to prepare nanocellulose has problems such as low yield, long preparation time, high energy consumption, and high environmental pollution.
  • the purpose of the present invention is to provide a method for preparing bamboo pulp nanocellulose.
  • a method for preparing bamboo pulp nanocellulose including the following steps: adding 90-100 parts of citric acid-sodium citrate buffer with a pH value of 5.0 and 35-45 parts of an enzyme solution with a mass fraction of 8% In a beaker of 10-20 parts of absolutely dry slurry, stir the reaction at 44-48°C for 11-13h at a stirring rate of 150r/min.
  • the reaction time When the reaction time is reached, heat the enzymatic hydrolysate in a 100°C water bath for 25-35min, and transfer it into
  • the ultrasonic power is 540-560W
  • the ultrasonic frequency is 35-45kHz
  • the ultrasonic treatment is 7-8h
  • the resulting suspension is centrifuged at a high speed, and the centrifugal washing is continued until a colloidal solution appears on the upper layer, and the colloidal solution is collected to be nanofibers Vegetarian solution; all raw materials are parts by weight.
  • the reaction is stirred at 46° C. for 12 h.
  • the enzymolysis solution is heated in a water bath at 100°C for 30 minutes after reaching the reaction time.
  • the ultrasonic power is 550W.
  • the ultrasonic frequency is 40 kHz.
  • ultrasonic treatment is performed for 7.5 hours.
  • the preparation conditions are mild, the damage to the crystallization area is small, and the prepared bamboo pulp nanocellulose has good performance and thermal stability, and is expected to have better application development in the field of heat-resistant biomass composite materials.
  • a method for preparing bamboo pulp nanocellulose including the following steps: adding 95 parts of citric acid-sodium citrate buffer with a pH of 5.0 and 40 parts of enzyme solution with a mass fraction of 8% into 15 parts of absolutely dry In the beaker of the slurry, stir the reaction at 46°C for 12h at a stirring rate of 150r/min.
  • a method for preparing bamboo pulp nanocellulose including the following steps: adding 90 parts of citric acid-sodium citrate buffer solution with a pH of 5.0 and 35 parts of enzyme solution with a mass fraction of 8% to 10 parts of absolutely dry In the beaker of the slurry, stir the reaction at 44°C for 11h at a stirring rate of 150r/min. After reaching the reaction time, heat the enzymatic hydrolysate in a water bath at 100°C for 25min, and then move it into the ultrasonic reactor, the ultrasonic power is 540W, the ultrasonic frequency Ultrasonic treatment was performed at 35kHz for 7h, the obtained suspension was centrifuged at high speed, and the centrifugal washing was continued until a colloidal solution appeared on the upper layer. Collecting the colloidal solution was the nanocellulose solution; each raw material was in parts by weight.
  • a method for preparing bamboo pulp nanocellulose including the following steps: adding 100 parts of citric acid-sodium citrate buffer solution with a pH of 5.0 and 45 parts of enzyme solution with a mass fraction of 8% to 20 parts of absolutely dry In the beaker of the slurry, stir the reaction at 48°C for 13h at a stirring rate of 150r/min. When the reaction time is reached, heat the enzymatic hydrolysate in a water bath at 100°C for 35min, and move it into an ultrasonic reactor with an ultrasonic power of 560W and an ultrasonic frequency.
  • the preparation conditions are mild, the damage to the crystallization area is small, and the prepared bamboo pulp nanocellulose has good performance and thermal stability, and is expected to have better application development in the field of heat-resistant biomass composite materials.

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  • Organic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Zoology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microbiology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biotechnology (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

提供一种制备竹浆纳米纤维素的方法，步骤如下：将pH值为5.0的柠檬酸-柠檬酸钠缓冲液和质量分数为8％的酶液加入装有绝干浆料的烧杯中，在44-48℃下搅拌反应11-13h，到达反应时间后将酶解液于100℃水浴锅中加热25-35min，移入超声波反应器中，超声功率为540-560W，超声频率为35-45kHz，超声处理7-8h，将所得悬浮液高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液。该制备条件温和，对结晶区的损害较小，制备的竹浆纳米纤维素具有良好的性能和热稳定性，有望在耐热性生物质复合材料领域有较好的应用发展。

Description

一种制备制备竹浆纳米纤维素的方法 技术领域
本发明涉及一种制备制备竹浆纳米纤维素的方法。
背景技术
纳米纤维素是指至少有一维空间尺寸为纳米级别的纤维素材料，其不仅具有纤维素的基本结构和性能，还具有区别于天然纤维素的纳米颗粒的特性。首先，与天然纤维素相比，它具有非常高的强度、杨氏模量和张应力。其次，它表面较强的化学反应活性，使其可用于纤维素的化学改性；因其水悬浮液呈稳定的胶状液，因此可作为药物赋形剂；纳米纤维素胶能耐高温和低温，具有乳化和增稠的作用，还可作为食品添加剂。另外，它具有巨大的比表面积，可利用尺寸效应引起的化学、物理性质方面的变化会明显改变材料的光、电、磁等性能，可在一定程度上优化纤维素的性能，使其在精细化工、材料等领域具有更广阔的应用前景。目前纳米纤维素的制备主要有化学法、物理法和生物法。传统化学方法制备纳米纤维素是用酸水解，氢离子进入纤维素内部，使纤维素结构中的β-1,4-糖苷键断裂，其对设备的腐蚀性大，回收处理反应残留物困难，容易对环境造成污染；常规物理法制备纳米纤维素需要高速研磨设备或高压设备等特殊设备，能耗高，制备时间长，纤维素的降解程度难以控制。因此，在纳米纤维素的制备过程中，如何提高纤维素的化学反应活性是关键问题，在此基础上研发出新型的绿色、低能耗、高效的制备方法具有重要的意义。
中国是竹子大国，竹子产量居世界首位。竹子具有很强的可再生性，通过研究竹浆提取纳米纤维素对于高效利用可再生农林副产物及保护环境具有重要意义。纤维素酶法水解是利用纤维素酶选择性酶解纤维素的无定形区以及不完美的结晶区，最终获得纳米纤维素。酶解法为低能耗的绿色过程，不仅可以提高产品的质量及纯度，还可以减少化学品用量，环境污染少、反应比较专一、反应条件温和且获得的纳米纤维素性能好。目前研究中结合机械处理或酸水解制备纳米纤维素，存在产率低、制备时间长、耗能大以及环境污染大等问题。
发明内容
本发明的目的在于提供一种制备制备竹浆纳米纤维素的方法。
本发明通过下面技术方案实现：
一种制备制备竹浆纳米纤维素的方法，包括如下步骤：将90-100份pH值为5.0的柠檬酸-柠檬酸钠缓冲液和35-45份质量分数为8％的酶液加入装有10-20份绝干浆料的烧杯中，在44-48℃下搅拌反应11-13h，搅拌速率150r/min，到达反应时间后将酶解液于100℃水浴锅中加热25-35min，移入超声波反应器中，超声功率为540-560W，超声频率为35-45kHz，超声 处理7-8h，将所得悬浮液高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液；各原料均为重量份。
优选地，所述的方法中，在46℃下搅拌反应12h。
优选地，所述的方法中，到达反应时间后将酶解液于100℃水浴锅中加热30min。
优选地，所述的方法中，超声功率为550W。
优选地，所述的方法中，超声频率为40kHz。
优选地，所述的方法中，超声处理7.5h。
本发明技术效果：
该制备条件温和，对结晶区的损害较小，制备的竹浆纳米纤维素具有良好的性能和热稳定性，有望在耐热性生物质复合材料领域有较好的应用发展。
具体实施方式
下面结合实施例具体介绍本发明的实质性内容。
实施例1
一种制备制备竹浆纳米纤维素的方法，包括如下步骤：将95份pH值为5.0的柠檬酸-柠檬酸钠缓冲液和40份质量分数为8％的酶液加入装有15份绝干浆料的烧杯中，在46℃下搅拌反应12h，搅拌速率150r/min，到达反应时间后将酶解液于100℃水浴锅中加热30min，移入超声波反应器中，超声功率为550W，超声频率为40kHz，超声处理7.5h，将所得悬浮液高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液；各原料均为重量份。
实施例2
一种制备制备竹浆纳米纤维素的方法，包括如下步骤：将90份pH值为5.0的柠檬酸-柠檬酸钠缓冲液和35份质量分数为8％的酶液加入装有10份绝干浆料的烧杯中，在44℃下搅拌反应11h，搅拌速率150r/min，到达反应时间后将酶解液于100℃水浴锅中加热25min，移入超声波反应器中，超声功率为540W，超声频率为35kHz，超声处理7h，将所得悬浮液高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液；各原料均为重量份。
实施例3
一种制备制备竹浆纳米纤维素的方法，包括如下步骤：将100份pH值为5.0的柠檬酸-柠檬酸钠缓冲液和45份质量分数为8％的酶液加入装有20份绝干浆料的烧杯中，在48℃下搅拌反应13h，搅拌速率150r/min，到达反应时间后将酶解液于100℃水浴锅中加热35min，移入超声波反应器中，超声功率为560W，超声频率为45kHz，超声处理8h，将所得悬浮液 高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液；各原料均为重量份。
该制备条件温和，对结晶区的损害较小，制备的竹浆纳米纤维素具有良好的性能和热稳定性，有望在耐热性生物质复合材料领域有较好的应用发展。

Claims (6)

  1. 一种制备制备竹浆纳米纤维素的方法，其特征在于包括如下步骤：将90-100份pH值为5.0的柠檬酸-柠檬酸钠缓冲液和35-45份质量分数为8％的酶液加入装有10-20份绝干浆料的烧杯中，在44-48℃下搅拌反应11-13h，搅拌速率150r/min，到达反应时间后将酶解液于100℃水浴锅中加热25-35min，移入超声波反应器中，超声功率为540-560W，超声频率为35-45kHz，超声处理7-8h，将所得悬浮液高速离心，继续离心洗涤直至上层出现胶体状溶液，收集该胶体溶液即为纳米纤维素溶液；各原料均为重量份。
  2. 根据权利要求1所述的方法，其特征在于：在46℃下搅拌反应12h。
  3. 根据权利要求1所述的方法，其特征在于：到达反应时间后将酶解液于100℃水浴锅中加热30min。
  4. 根据权利要求1所述的方法，其特征在于：超声功率为550W。
  5. 根据权利要求1所述的方法，其特征在于：超声频率为40kHz。
  6. 根据权利要求1所述的方法，其特征在于：超声处理7.5h。
PCT/CN2020/091950 2020-05-23 2020-05-23 一种制备制备竹浆纳米纤维素的方法 WO2021237382A1 (zh)

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