Method for preparing cellulose sponge

A cellulose sponge and cellulose technology, which is applied in the field of cellulose sponge preparation, can solve the problems of difficult NMMO recovery and high cost of NMMO, and achieve the effects of increasing product cost, eliminating pollution, and excellent performance

Inactive Publication Date: 2011-10-12
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the process is simple, the production cycle is short, and the toxicity of the solvent NMMO used is low, and the pollution to th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. After 10 grams of wood pulp with a degree of polymerization of 450 are shredded and 150 grams of 15% sodium hydroxide solution is added to a 250 milliliter reaction bottle, the stirrer is turned on at 25° C. to oxidize the cellulose and hydroxide Mix the sodium solution thoroughly, stop stirring after 2 hours, rinse with water after filtering out, remove free lye and filter dry, put it into a reaction bottle, add 20 grams of urea aqueous solution, 100 grams of xylene, turn on the stirrer and start to heat up . After the water is completely removed, the temperature rises to 137°C and continues to react for 2.5 hours. Stop heating, wait for the temperature to drop to 70°C, stop stirring, recover xylene, then rinse the product with water at the same temperature, and dry it to obtain 11 grams of polymerization degree 300, dry cellulose carbamate with a nitrogen content of 2.5%.

[0029] b. Weigh 7 grams of the above-mentioned cellulose carbamate, and dissolve it into 93...

Embodiment 2

[0033] a. After 10 grams of wood pulp with a degree of polymerization of 620 is shredded and 150 grams of 15% sodium hydroxide solution is added to a 250 milliliter reaction flask, the stirrer is turned on at 25° C. to oxidize the cellulose and hydroxide Mix the sodium solution thoroughly, stop stirring after 2 hours, filter out, rinse with water, remove free lye and filter dry, put it into a reaction bottle, add 25 grams of urea aqueous solution, 150 grams of xylene, turn on the stirrer and start to heat up . After the water is completely removed, the temperature rises to 137°C and continues to react for 2.5 hours. Stop heating, wait for the temperature to drop to 70°C, stop stirring, recover xylene, then rinse the product with water at the same temperature, and dry it to obtain 11.4 grams of polymerization degree 480, dry cellulose carbamate with a nitrogen content of 3.47%.

[0034] b. Weigh 6 grams of the above-mentioned cellulose carbamate, dissolve it into 94 grams of s...

Embodiment 3

[0038] a. After 10 grams of wood pulp with a degree of polymerization of 750 is shredded and 150 grams of 15% sodium hydroxide solution is added to a 250 milliliter reaction bottle, the stirrer is turned on at 25° C. to oxidize the cellulose and hydroxide Mix the sodium solution thoroughly, stop stirring after 2 hours, rinse with water, remove free lye, filter and dry, put it into a reaction flask, add 30 grams of urea aqueous solution, 200 grams of xylene, turn on the stirrer and start to heat up. After the water is completely removed, the temperature rises to 137°C, and the reaction is continued for 2.5 hours, then the heating is stopped, and the stirring is stopped when the temperature drops to 70°C, the xylene is recovered, and then the product is washed with water at the same temperature and dried to obtain 11.8 grams of polymerization degree 550, dry cellulose carbamate with a nitrogen content of 4%.

[0039] b. Take 5 grams of the above-mentioned cellulose carbamate, an...

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PUM

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Abstract

The invention relates to a method for preparing a cellulose sponge by the steps of activating cellulose wood pulp, reacting with urea to prepare dry cellulose carbamate, dissolving the dry cellulose carbamate in a dilute sodium hydroxide solution at low temperature to form a cellulose carbamate solution, then adding cotton linter, a pore former, color paste and the like to the cellulose carbamate solution for uniformly mixing, ageing at low temperature, putting in boiled water and then cooking to make the cellulose regenerate, forming gaps after the dissolution of the pore former in water, alternatively washing with water and weak acid until neutrality appears, soaking in the water emulsion of a softener, and the like.

Description

technical field [0001] The invention relates to a dry cellulose carbamate prepared by using cellulose wood pulp, activated by sodium hydroxide, and reacting with urea, which is dissolved in dilute sodium hydroxide solution under low temperature conditions to form cellulose amino groups. After the formate solution, mix evenly by adding cotton linters, pore-forming agent and color paste, etc., age at low temperature, cook in boiling water to regenerate cellulose, pore-forming agent dissolves in water to leave gaps, water After being neutralized by alternating washing with weak acid, the method of preparing cellulose sponge by soaking in softener and other processes. technical background [0002] With the increasing depletion of petrochemical resources and the stricter control of environmental pollution, there is a shortage of raw materials, the production process has pollutants, and the production process of polyurethane sponge is difficult to degrade naturally after being dis...

Claims

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Application Information

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IPC IPC(8): C08L1/04C08L1/02C08B15/06C08J9/26
Inventor 哈丽丹·买买提布佐热·克比尔
Owner XINJIANG UNIVERSITY
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