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A method for preparing nano-microcrystalline cellulose from waste corrugated cardboard

A corrugated board and nanocrystalline technology, which is applied in the field of cellulose, can solve the problems such as the decrease in thermal stability of nanocrystalline cellulose, and achieve the effects of high-value utilization, mild conditions and improved yield.

Active Publication Date: 2016-06-29
SHANGHAI TONNOR MATERIAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] On the other hand, the traditional method of preparing nanocrystalline cellulose is mainly sulfuric acid hydrolysis, but sulfuric acid is highly corrosive and degradable.
Another disadvantage is that the hydrolysis of sulfuric acid will greatly reduce the thermal stability of nanocrystalline cellulose, which has been proved by many international research work

Method used

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  • A method for preparing nano-microcrystalline cellulose from waste corrugated cardboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Accurately weigh 500g of waste corrugated cardboard (dry) and tear it into about 5×5cm 2 The fragments were soaked in 4500mL distilled water for 24 hours, and then crushed with a high-concentration hydraulic pulper for 15 minutes. Accurately weigh 10g of NaOH and dissolve it in 1000mL of distilled water, add 100g of corrugated pulp that has undergone the above mechanical pretreatment, heat in a water bath for 3h, and control the reaction temperature to 60°C. Then filter to remove impurities. The screened waste paper pulp fibers are centrifuged and washed to neutrality in a centrifuge with a centrifugal speed of 5000 rpm, and further dehydrated and concentrated.

[0035]Accurately weigh 20 g of the above-mentioned treated waste paper pulp fiber and place it in a three-necked flask, add 250 mL of 60% (w / w) phosphoric acid solution, and stir at room temperature for 6 h. Add 150 mL of 25% (w / w) dimethyl sulfoxide solution and continue to stir for 30 minutes to stop stirri...

Embodiment 2

[0038] Accurately weigh 500g of waste corrugated cardboard (dry) and tear it into about 5×5cm 2 The fragments were soaked in 4500mL distilled water for 24 hours, and then crushed with a high-concentration hydraulic pulper for 15 minutes. Accurately weigh 10g of NaOH and dissolve it in 1000mL of distilled water, add 100g of corrugated pulp that has undergone the above mechanical pretreatment, heat in a water bath for 3h, and control the reaction temperature to 60°C. Then filter and remove impurities. The screened waste paper pulp fibers are centrifuged and washed to neutrality in a centrifuge with a centrifugal speed of 5000 rpm, and further dehydrated and concentrated.

[0039] Accurately weigh 20 g of the above-mentioned treated waste paper pulp fiber and place it in a three-necked flask, add 250 mL of 60% (w / w) phosphoric acid solution, and stir at room temperature for 6 h. Add 150 mL of 25% (w / w) dimethyl sulfoxide solution and continue to stir for 30 minutes to stop stir...

Embodiment 3

[0042] Accurately weigh 500g of waste corrugated cardboard (dry) and tear it into about 5×5cm 2 The fragments were soaked in 4500mL distilled water for 24 hours, and then crushed with a high-concentration hydraulic pulper for 15 minutes. Accurately weigh 10g of NaOH and dissolve it in 1000mL of distilled water, add 100g of corrugated pulp that has undergone the above mechanical pretreatment, heat in a water bath for 3h, and control the reaction temperature to 60°C. Then filter and remove impurities. The screened waste paper pulp fibers are centrifuged and washed to neutrality in a centrifuge with a centrifugal speed of 5000 rpm, and further dehydrated and concentrated.

[0043] Accurately weigh 20 g of the above-mentioned treated waste paper pulp fiber and place it in a three-necked flask, add 250 mL of 60% (w / w) phosphoric acid solution, and stir at room temperature for 6 h. Add 150 mL of 25% (w / w) dimethyl sulfoxide solution and continue to stir for 30 minutes to stop stir...

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Abstract

The invention relates to a method for preparing nano-grade microcrystalline cellulose with waste corrugated boards as a raw material. A traditional nano-grade microcrystalline cellulose preparation method is mainly a sulfuric acid hydrolysis method. However, sulfuric acid has high corrosivity and high degradation property. Also, nano-grade microcrystalline cellulose thermal stability is greatly reduced due to sulfuric acid hydrolysis. According to the invention, waste corrugated boards are adopted as a raw material. With mechanical pretreatment and alkali treatment, the boards are processed into pulp; and phosphoric acid hydrolysis, enzymolysis and ultrasound treatment are carried out, such that nano-grade microcrystalline cellulose is prepared. The invention provides a novel raw material resource for preparing the nano-grade microcrystalline cellulose. Waste corrugated boards are adopted as secondary recycled fiber, such that resource recycling is facilitated, and the method is environment-friendly. Mechanical pretreatment, acid hydrolysis pretreatment, enzymolysis and auxiliary ultrasonic treatment are combined, such that complementary benefits of the methods are combined, and defects of single treatment methods are avoided. With the method, nano-grade microcrystalline cellulose preparation yield and quality can be improved.

Description

technical field [0001] The invention belongs to the technical field of cellulose, and in particular relates to a method for preparing nano-microcrystalline cellulose by using waste corrugated cardboard as a raw material through a novel process. technical background [0002] Cellulose is the most widely distributed and biodegradable natural polymer in nature. It widely exists in the roots, stems, leaves of trees, cotton and other plants, as well as some algae and bacteria, accounting for 50% of the carbon content in the plant world. above. Cellulose is an important raw material for papermaking. In addition, products based on cellulose are also widely used in plastics, explosives, electrical and scientific research equipment, etc. The cellulose in food (that is, dietary fiber) also plays an important role in human health. [0003] Cellulose molecules are a system of interlaced combination of nematically ordered crystalline regions and amorphous regions, relying on intramole...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/02D21C5/00
CPCD21C5/005D21C5/02D21C5/022Y02W30/64
Inventor 唐艳军沈小创
Owner SHANGHAI TONNOR MATERIAL SCI
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