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Production method of natural cellulose membrane

A technology of natural cellulose and production method, which is applied in the production field of natural cellulose film and can solve the problems of unsatisfactory sliding strength of natural cellulose film and the like

Active Publication Date: 2011-08-03
绍兴柯德新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But utilize the method in the prior art to prepare indexs such as smoothness, strength of natural cellulose film all unsatisfactory

Method used

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  • Production method of natural cellulose membrane
  • Production method of natural cellulose membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Put 350 kg of cotton pulp into 18% sodium hydroxide aqueous solution by mass percentage, and soak at 60° C. for 20 minutes to obtain an alkali cellulose soaking solution.

[0082] After adding 10 grams of pressing aid (Visco 44) in the soaking liquid, utilize a squeezing machine, and the squeezing pressure is 0.095Mpa, and pressing the soaking liquid removes excess lye, and pressing is until the mass percentage of methylcellulose in the alkali cellulose is 32%.

[0083] The pressed alkali cellulose is pulverized into fine loose crumb state 1150KG. Put the pulverized alkali cellulose at 60° C. for 2.5 hours to age.

[0084] Soak the aged alkali cellulose in 10% sodium hydroxide aqueous solution for 30 minutes for pre-alkalinization, and then pass it into CS 2 Carry out yellowing reaction for 60 minutes to obtain cellulose xanthate. The yellowing reaction temperature is 25 degrees, and the mass ratio of aqueous sodium hydroxide solution to alkali cellulose after aging i...

Embodiment 2

[0104] Put 350 kg of cotton pulp into 18% sodium hydroxide aqueous solution by mass percentage, and soak at 60° C. for 20 minutes to obtain an alkali cellulose soaking solution.

[0105] After adding 10 grams of pressing aid (Visco 44) to the soaking liquid, use a squeeze machine to press the soaking liquid to remove excess lye. The pressing pressure is 0.095mpa, and pressing is until the mass percentage of methylcellulose in the alkali cellulose is 32%.

[0106] The pressed alkali cellulose is pulverized into fine loose crumb state 1140KG. Put the pulverized alkali cellulose at 70°C for 2 hours to age.

[0107] Add the aged alkali cellulose to 10% sodium hydroxide aqueous solution and soak for 35 minutes for pre-alkalinization, and then pass it into CS 2 Carry out yellowing reaction for 90 minutes to obtain cellulose xanthate. Yellowing reaction temperature is 35 degrees, CS 2 The mass ratio with the aged alkali cellulose is 1: 12.

[0108] Dissolve cellulose xanthate in ...

Embodiment 3

[0126] Adopt the technique of embodiment 1, difference is not to add pressing aid before pressing,

[0127] Final product tested:

[0128] Moisture in finished natural cellulose film: 10.5%;

[0129] Longitudinal tensile strength: 33N / 15mm;

[0130] Transverse tensile strength: 17N / 15mm;

[0131] Longitudinal elongation: 15%;

[0132]Transverse elongation: 36%;

[0133] Vertical and horizontal average tearing degree: 1.5N.m 2 / g;

[0134] Slip: friction coefficient static 0.21, dynamic 0.19 (testing method: ASTMD 1894), anti-adhesive 71% RH (national standard);

[0135] Oxygen permeability 1.9cc / m 2 .24hrs (test method: ASTMD 1927 test condition: 23°C 0% RH);

[0136] It can be naturally degraded in a humid natural environment for 6 months to produce water and carbon dioxide.

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Abstract

The invention discloses a production method of natural cellulose membranes, comprising the following steps: (a) immersion; (b) squeezing; (c) grinding; (d) maturing; (e) etiolation; (f) solution; (g) film formation; (h) desulfuration; (i) bleaching; (j) plastification; and (k) drying. The production method has the advantages of mild reaction condition, short spacings among the prepared natural cellulose membranes, stable expansion rate and tensile strength, proper stiffness and flexibility, better colour and luster, good transparence, high hygiene property, and the like, improves the surface property of paper through the plastification, in particular enhances the smoothness of paper surfaces, improves the printability, reduces the deformability of paper and the moisture absorption, thereby reaching the new requirement of modern printing and packaging.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a production method of a natural cellulose film. Background technique [0002] Natural cellulose membranes have excellent properties such as environmental protection and non-toxicity. For example, Chinese invention patent 90109250.9 discloses a new method for preparing regenerated cellulose membranes using cotton stalks and peanut shells. After hydrolyzing cotton stalks and peanut shells with 4.5-5% nitric acid solution, and then treating them with NaOH, the cellulose content of cotton stalks is 90%, and Mn=1.56×10 5 And peanut shell cellulose content is 91%, Mn=1.52×10 5 , and then configure cellulose cuproammonia solution, after filtering and scraping the film, solidify and form in dilute alkali and dilute acid. [0003] However, the methods in the prior art to prepare the natural cellulose film have unsatisfactory indexes such as smoothness and strength. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/02
Inventor 娄尧祥陈汉爱王洪军李波许德祥
Owner 绍兴柯德新材料有限公司
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