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Low-temperature dissolving method by adopting cellulose combined raw material and application thereof

A technology of cellulose dissolving and low-temperature dissolving, applied in the field of cellulose processing, can solve the problems such as difficult to reflect market application value, low content of cellulose dissolving gum, decreased strength of final product, etc. simple effect

Pending Publication Date: 2020-08-07
武汉水木弘新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, large-scale production research generally uses cotton pulp raw materials with a degree of polymerization of 400-500, which has a low content of cellulose soluble gum and high production costs.
Reducing the degree of polymerization of raw materials can increase the content of cellulose soluble gum and reduce costs, but the strength of the final product will decrease significantly, making it difficult to reflect the market application value; increasing the degree of polymerization of raw materials can increase the strength of the final product, but the content of cellulose soluble gum lower cost of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Weigh the cellulose mixture of 560g of sample A and 440g of sample B, weigh 10.76kg of low-temperature lye at -4.1°C, stir quickly and evenly, and obtain 11.76kg of pulp and porridge mixture with a cellulose content of 8.5%, and place in a dry, clean In a stainless steel tray, the thickness of the porridge is 20mm, and then put it in a freezer at -26°C for 12 hours, take it out, thaw it in a water bath at room temperature (22°C), seal it and let it stand until the temperature of the material rises to 20°C. Stir to obtain a transparent cellulose solution, and keep it sealed.

Embodiment 2

[0046] Weigh 650g of the cellulose mixture of sample A and 350g of sample C, weigh 10.36kg of low-temperature lye at -4.2°C, stir quickly and evenly to obtain 11.36kg of pulp and porridge mixture with a cellulose content of 8.8%, and place in a dry, clean In a stainless steel tray, the thickness of the porridge is 20mm, and then put it in a freezer at -26°C for 12 hours, take it out, thaw it in a water bath at room temperature (22°C), seal it and let it stand until the temperature of the material rises to 20°C. Stir to obtain a transparent cellulose solution, and keep it sealed.

Embodiment 3

[0048] Weigh 350g of sample A, 400g of sample B and 250g of sample C cellulose mixture, weigh 10.11kg of low-temperature lye at -4.3°C, stir quickly and evenly, and obtain 11.11kg of pulp and porridge mixture with a cellulose content of 9%, and place it in a dry place. 1. In a clean stainless steel tray, the thickness of the porridge is 20mm, and then put it into the freezer at -26°C for 12 hours, take it out, thaw it in a water bath at room temperature (22°C), seal it and let it stand until the temperature of the material rises to 20°C ℃, stirred to obtain a transparent cellulose solution, sealed and stored.

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PUM

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Abstract

The invention discloses a low-temperature dissolving method by adopting a cellulose combined raw material and application thereof. The preparation method comprises the following specific steps: 1) mixing at least two cellulose raw materials with different polymerization degrees to obtain a cellulose mixture; 2) putting the cellulose mixture into alkali liquor subjected to cooling treatment, and performing uniform stirring to obtain uniform cellulose pulp porridge; and 3) deeply freezing the cellulose pulp porridge, and then heating and unfreezing to obtain stable cellulose dissolved colloid. According to the invention, the synergistic effect of cellulose with different polymerization degrees is utilized; cellulose with higher polymerization degree is used as a skeleton, and cellulose withlower polymerization degree is used for gap filling, so that the strength of a cellulose regenerated product is improved, the application range of cellulose is expanded, the cost is remarkably reduced, and the cellulose regenerated product can be widely applied to the fields of regenerated cellulose fibers, films, microspheres or hydrogel and the like while high dissolution concentration of cellulose is ensured.

Description

technical field [0001] The invention relates to the technical field of cellulose processing, in particular to a low-temperature dissolution method using cellulose combined raw materials and its application. Background technique [0002] The traditional cellulose regeneration production process generally adopts the viscose method. During the dissolution process, a large amount of carbon disulfide is used to sulfonate the cellulose, and then diluted and dissolved with dilute alkali. Sulfur-containing gas is produced during the production process, and a large amount of waste gas and waste water are generated in the post-processing desulfurization production stage of the product, which has caused serious pollution to the environment, and is facing the situation of shutdown or overall relocation. [0003] In order to solve the pollution problem of cellulose regeneration production, domestic and foreign enterprises and research institutions are actively carrying out research on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05C08L1/02C08L1/10
CPCC08J3/05C08J2301/02C08J2401/02C08J2401/10
Inventor 段煌李雅明
Owner 武汉水木弘新材料有限公司
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