Preparation method for composite material of cellulose nanofiber and reinforced polyurethane

A technology of nanofibers and composite materials, applied in papermaking, paper recycling, processing waste paper, etc., can solve the problems that have not yet been developed

Inactive Publication Date: 2013-12-11
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to achieve a better fiber opening effect for purified fibers, Chen Wenshuai et al. extracted poplar wood powder, removed lignin and hemicellulose, treated it with 1wt% hydrochloric acid, and then subjected it to high-intensity ultrasonic treatment to obtain f...

Method used

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  • Preparation method for composite material of cellulose nanofiber and reinforced polyurethane
  • Preparation method for composite material of cellulose nanofiber and reinforced polyurethane
  • Preparation method for composite material of cellulose nanofiber and reinforced polyurethane

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preparation example Construction

[0043] A preparation method of cellulose nanofiber / reinforced polyurethane composite material, comprising the steps of:

[0044] 1) Chemical pretreatment:

[0045] Accurately weigh 6g of newspaper debris, put it in a 600ml beaker, add 300ml of distilled water, stir at high speed for 3 minutes with a disperser, then add 2g of sodium chlorite and 1.5ml of glacial acetic acid, stir evenly, seal the mouth of the beaker with plastic wrap Heat treatment in a magnetic heating stirrer at 75°C for 1 hour; during the heating process, use a magnet to continuously stir, and after 1 hour, without waiting for the solution to cool, directly add 1.5ml of glacial acetic acid and 2.0g of sodium chlorite, shake well, and continue to heat at 75°C Heating in a stirrer for 1 hour, repeat this twice, then filter with a Buchner funnel, and wash the residue repeatedly with distilled water until the solution is neutral, remove lignin to obtain a sample; move the sample into a 600ml beaker, pour 300ml q...

Embodiment 1

[0061] Example 1: State evolution during the preparation of newspaper cellulose nanofibers:

[0062] The morphology of newspaper cellulose nanofibers undergoes a series of changes during the preparation process. Due to the large amount of ink, impurities, etc., the newspaper pulp presents a dark gray color, but after being treated with sodium chlorite, it becomes light gray. Probably due to the bleaching action of chloride ions. After the alkali treatment, the fiber pulp became snow white, which indicated that the alkali treatment effectively removed the ink and impurities. During the chemical treatment, the fiber pulp has always settled at the bottom of the bottle, but after grinding, the fiber pulp becomes a light blue suspension state, which is due to the nanonization of the grinding disc during the grinding process, which makes the size of the fiber Significantly smaller, so that evenly dispersed in water presents a suspended state.

Embodiment 2

[0063] Example 2: State evolution during the preparation of wood flour cellulose nanofibers:

[0064] In the process of preparing wood flour cellulose nanofibers in this example, the morphology of wood flour fibers also undergoes a series of changes. The raw material wood flour is light yellow, which is due to the color development of wood flour containing lignin and extracts. Because of the substance, when the wood powder is extracted with benzene alcohol solution to remove the extract, and the lignin is removed with the acidic sodium chlorite solution, the wood powder presents a snow white color, which shows that the colored substance lignin, the extracted Most of the substances have been removed. In addition, the wood flour fiber at this time has a slightly smaller particle size than the raw material, which is also due to the removal of lignin and extractives. However, after alkali treatment, the size of the fiber was significantly reduced and appeared powdery. On the o...

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Abstract

The invention discloses a preparation method for a composite material of cellulose nanofiber and reinforced polyurethane. The method comprises the following steps: 1) pretreating in a chemical method; 2) unfastening fibers in a mechanical method. According to the invention, chemical treatment and mechanical treatment are adopted to separate the cellulose nanofiber, which has a high length diameter ratio and is used for reinforced polyurethane, from newspaper; the transparent nano composite material with high-intensity is prepared; wood meal and newspaper are adopted as raw materials to prepare cellulose nanofiber through the chemical treatment combined with the mechanical treatment; the diameter range of the cellulose nanofiber is 30-100 nm, and the length diameter ratio is higher than 1000.

Description

technical field [0001] The invention relates to a preparation method of a cellulose nanofiber / reinforced polyurethane composite material, which belongs to the technical field of composite materials. Background technique [0002] Structural characteristics of cellulose nanofibers, cellulose nanofibers refer to cellulose nanomaterials with at least one dimension of nanoscale (1-100nm), which are considered to be the smallest structural units in plant fibers, composed of bundled Composed of cellulose molecular chains with high strength (10GPa) and high Young's modulus of elasticity (150GPa), because its size is close to the coherence length of electrons, its properties are greatly affected by the self-assembly brought about by strong coherence Variety. Moreover, its scale is close to the wavelength of light, and it has a special effect of a large surface, so it exhibits a wide range of properties. Cellulose nanofibers have low density, excellent mechanical properties, good bi...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L1/02C08J3/28D21C5/02
CPCY02W30/64
Inventor 李大纲李雪婷陈振东胡月薛莹莹潘佳李明珠
Owner NANJING FORESTRY UNIV
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