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Method for preparing cellulose nitrate from bamboo fibers

A technology of cellulose nitrate and bamboo fiber, which is applied in the field of preparing cellulose nitrate with bamboo fiber, can solve the problems of low transparency and difficult application of the solution, and achieve the effects of expanding the use space, alleviating the shortage, and reducing market risks

Inactive Publication Date: 2011-08-24
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if directly carry out nitration reaction with bamboo fiber (alpha-cellulose≤92.0%, whiteness≤80.0%, ash content≥0.65%, sulfuric acid insolubles≥0.65%) raw materials in fields such as existing weaving, papermaking, although can Obtain the cellulose nitrate ester whose nitration degree meets the index (172.0-198.0ml / g), but the transparency of its solution is low, so it is difficult to apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The concrete preparation method of described cellulose nitrate, concrete steps are as follows:

[0041] 1. Beating: Dissolve 30g of bamboo fiber in 1L of water and stir evenly; bamboo fiber α-cellulose 91.0%, whiteness 75.6%, ash content 0.71%, sulfuric acid insoluble matter 0.66%;

[0042] 2. Chlorination: add sodium hypochlorite for chlorination, the amount of sodium hypochlorite is 0.05% of the slurry weight, control pH≤2, temperature 15°C (normal temperature), chlorination for 1h;

[0043] 3. Alkali treatment: filter the water after chlorination, add 1L of 0.15% sodium hydroxide solution (0.1% by weight), heat up to 60°C, and perform alkali treatment for 1 hour;

[0044] 4. Bleaching: filter the water after alkali treatment, add 1L of 0.10% sodium hypochlorite solution (0.05% by weight), and control the temperature at 35°C for 1 hour;

[0045] 5. Acidification: After bleaching, filter the water, add 1L of water, control the pH ≤ 3.5, the temperature is 15°C, and th...

Embodiment 2

[0051] The concrete preparation method of described cellulose nitrate, concrete steps are as follows:

[0052] 1. Beating: Dissolve 30g of bamboo fiber in 1L of water and stir evenly;

[0053] 2. Chlorination: add sodium hypochlorite for chlorination, the amount of sodium hypochlorite is 0.10% of the weight of the slurry, control pH≤2, temperature 25°C (normal temperature), chlorination for 1h;

[0054] 3. Alkali treatment: filter the water after chlorination, add 1L of 0.25% sodium hydroxide solution, heat up to 70°C, and perform alkali treatment for 1 hour;

[0055] 4. Bleaching: filter the water after alkali treatment, add 1L of 0.20% sodium hypochlorite solution, and control the temperature at 40°C for 1 hour;

[0056] 5. Acidification: After bleaching, filter the water, add 1L of water, control the pH ≤ 3.5, the temperature is 15°C, and the time is 1h;

[0057] 6. Washing and drying: After acidification, wash with water and dry to obtain pretreated bamboo fiber, which h...

Embodiment 3

[0062] The concrete preparation method of described cellulose nitrate, concrete steps are as follows:

[0063] 1. Beating: Dissolve 30g of bamboo fiber in 1L of water and stir evenly;

[0064] 2. Chlorination: add sodium hypochlorite for chlorination, the dosage of sodium hypochlorite is 0.10%, control pH ≤ 2, temperature 25°C (normal temperature), chlorination for 1.5h;

[0065] 3. Alkali treatment: filter the water after chlorination, add 1L of 0.25% sodium hydroxide solution, heat up to 70°C, and perform alkali treatment for 1.5 hours;

[0066] 4. Bleaching: filter the water after alkali treatment, add 1L of 0.20% sodium hypochlorite solution, and control the temperature at 40°C for 1.5h;

[0067] 5. Acidification: After bleaching, filter the water, add 1L of water, control the pH ≤ 3.5, the temperature is 15°C, and the time is 1.5h;

[0068] 6. Washing and drying: After acidification, wash with water and dry to obtain pretreated bamboo fiber, which has a α-cellulose cont...

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Abstract

The invention belongs to the technical field of nitrocotton production methods, and particularly relates to a method for preparing cellulose nitrate from bamboo fibers. The method provided by the invention realizes diversification of raw materials in the production of nitrocellulose, and comprises the following steps: 1) dissolving the bamboo fibers in water; 2) adding sodium hypochlorite for chlorination, and controlling the pH value to be less than or equal to 2; 3) filtering, and adding a 0.1-0.3wt% sodium hydroxide solution into the filter residue; 4) filtering, and adding a 0.05-0.3wt% sodium hypochlorite solution into the filter residue; 5) filtering, adding water into the filter residue and controlling the pH value to be less than or equal to 3.5; 6) washing and drying to obtain the pretreated bamboo fibers; 7) mixing 100 parts by weight of pretreated bamboo fibers and 2,500-6,000 parts by weight of mixed acid at the temperature of 33-47 DEG C, wherein the reaction lasts for 38-50 minutes; and 8) boiling, washing and drying to obtain the cellulose nitrate. The method provided by the invention widens the application range of the raw materials in the production of nitrocellulose, and the prepared cellulose nitrate is applied to the military and civil fields according to different nitrogen contents respectively.

Description

technical field [0001] The invention belongs to the technical field of nitrocellulose production methods, in particular to a method for preparing cellulose nitrate with existing bamboo fibers. Background technique [0002] Cellulose nitrate, commonly known as nitrocellulose or nitrocellulose, is the product of the reaction between cellulose and nitric acid. It was originally used in the military field and is an important raw material for the manufacture of propellants, missiles, and rocket propellants; at the same time, cellulose nitrate has good Film-forming performance, can be used for surface coating of metal, wood and other materials, so it is widely used in civil industry, mainly used in the manufacture of various paints, typing stencils, inks, varnished cloth, bottle seals, adhesives, leather oil, Nail polish, ester-soluble or water-soluble paint, table tennis balls, piano keys and other products. [0003] At present, the production of nitrocellulose at home and abroa...

Claims

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Application Information

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IPC IPC(8): C08B5/02
Inventor 张仁旭马君赵利斌彭欢
Owner SICHUAN NITROCELLULOSE CORP
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