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Method for preparing high-strength transparent cellulose film material in low-temperature and normal-pressure cooking manner and application thereof

A cellulose film, atmospheric pressure cooking technology, applied in the direction of pressurized wood treatment, wood treatment, wood heating, etc., can solve the problems of fiber damage, poor tensile strength of transparent cellulose materials, and decreased cellulose polymerization degree, etc. Achieve the effect of reducing damage, retaining cellulose polymerization degree and reducing degradation

Inactive Publication Date: 2019-01-25
SOUTH CHINA INST OF COLLABORATIVE INNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still far below the strength of a single wood fiber (≈1GPa)
This is mainly due to the severe damage of sodium hypochlorite to the fiber during the delignification process, resulting in a serious decrease in the degree of cellulose polymerization, which also leads to the deterioration of the tensile strength of the prepared transparent cellulose material (Zhu M, Wang Y, Zhu S ,etal.Anisotropic,Transparent Films with Aligned Cellulose Nanofibers[J].Advanced Materials,2017,29(21).)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) cut the fir section into 50mm * 40mm * 1mm wood chips;

[0027] (2) Add wood chips to the cooking solution containing sodium chlorite (0.1g / g, relative to dry wood chips), glacial acetic acid (0.25mL / g, relative to dry wood chips) and deionized water In the beaker, the liquid ratio is 1:30g / mL (wood chip mass: deionized water volume), the cooking temperature is 75°C, and an equal amount of cooking liquid is added every 2 hours (referring to the cooking liquid equal to the amount used for the first time, The same below), cook at normal pressure for 10 hours until the wood chips turn white completely, without stirring during the reaction, to keep the complete shape and structure of the wood chips;

[0028] (3) Washing the cooked wood chips to remove residual cooking liquid;

[0029] (4) Dry the washed wood chips for 10 h under a pressure of 6 MPa to prepare a high-strength transparent cellulose film material.

[0030] The tensile strength of the untreated wood chips...

Embodiment 2

[0032] (1) cut the fir section into 50mm * 40mm * 1mm wood chips;

[0033](2) Add wood chips to the cooking solution containing sodium chlorite (0.3g / g, relative to dry wood chips), glacial acetic acid (0.25mL / g, relative to dry wood chips) and deionized water In a beaker, the liquid ratio is 1:30g / mL (the mass of wood chips: the volume of deionized water), the cooking temperature is 75°C, an equal amount of cooking liquid is added every 2 hours, and the cooking liquid is cooked at normal pressure for 8 hours until the wood chips are completely white. There is no need to stir in order to maintain the complete shape and structure of the wood chips;

[0034] (3) Washing the cooked wood chips to remove residual cooking liquid;

[0035] (4) Dry the washed wood chips for 10 h under a pressure of 6 MPa to prepare a high-strength transparent cellulose film material.

[0036] The tensile strength of the untreated wood chips used in the experiment was 48 MPa, and the fiber polymeriza...

Embodiment 3

[0038] (1) cut the fir section into 50mm * 40mm * 1mm wood chips;

[0039] (2) Add wood chips to the cooking solution containing sodium chlorite (1.0g / g, relative to dry wood chips), glacial acetic acid (0.25mL / g, relative to dry wood chips) and deionized water In a beaker, the liquid ratio is 1:30g / mL (the mass of wood chips: the volume of deionized water), the cooking temperature is 75°C, an equal amount of cooking liquid is added every 2 hours, and the cooking liquid is cooked at normal pressure for 4 hours until the wood chips are completely white. There is no need to stir in order to maintain the complete shape and structure of the wood chips;

[0040] (3) Washing the cooked wood chips to remove residual cooking liquid;

[0041] (4) Dry the washed wood chips for 10 h under a pressure of 6 MPa to prepare a high-strength transparent cellulose film material.

[0042] The tensile strength of the untreated wood chips used in the experiment was 48 MPa, and the fiber polymeriz...

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Abstract

The invention relates to a method for preparing a high-strength transparent cellulose film material in a low-temperature and normal-pressure cooking manner and application thereof. The preparation method comprises the following steps: adding wood sheets into a cooking chemical solution prepared from sodium chlorite, acid and water, removing lignin in a cooking manner at the temperature less than or equal to 100 DEG C, adding an equal amount of chemical every two hours until the wood sheet becomes white, and thus obtaining the lignin-removed wood sheet; and washing the lignin-removed wood sheetby using water, removing the residual cooking chemical solution, pressurizing and drying, and thus obtaining the high-strength transparent cellulose film material. The cellulose film material prepared in the invention has excellent mechanical properties due to the reservation of orderly-arranged structure characteristics of fibers in the wood and high polymerization degree of the fibers, and thetensile strength is 8 to 15 times of the original wood sheet; and meanwhile, since the air in the internal pore is removed in the pressurizing process, the optical performance is good.

Description

technical field [0001] The invention belongs to the technical field of transparent paper and papermaking, and in particular relates to a method for preparing a high-strength transparent cellulose film material by cooking at low temperature and normal pressure and its application. Background technique [0002] Most of the optoelectronic and microfluidic devices are built on transparent glass or plastic substrates. However, these substrate materials are difficult to biodegrade, especially plastic waste will release toxic substances into the soil and water environment, which greatly endangers human beings and environment for other organisms. In addition, burning plastics such as polyvinyl chloride leads to the emission of dioxins, which may cause respiratory problems and other health problems (Kumar S, Aggarwal S G, Gupta P K, et al. Investigation of the tracers for plastic-enriched waste burning aerosols[J ]. Atmospheric Environment, 2015, 108:49-58.) Therefore, this drives p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K5/00B27K5/04B27K3/52
CPCB27K3/52B27K5/001B27K5/007B27K5/04
Inventor 方志强李博刘宇
Owner SOUTH CHINA INST OF COLLABORATIVE INNOVATION
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