Production method of natural cellulose membrane

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

Active Publication Date: 2010-01-20
绍兴柯德新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But utilize the method in the prior art to prepare indexs such

Method used

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

Examples

Experimental program
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Example Embodiment

[0080] Example 1

[0081] Put 350 kilograms of cotton pulp in an aqueous sodium hydroxide solution with a concentration of 18% by mass, and soak at 60° C. for 20 minutes to obtain an impregnating solution of alkali cellulose.

[0082] After adding 10 grams of squeezing aid (Visco 44) to the dipping liquid, use a squeezing machine at a squeezing pressure of 0.095Mpa to remove excess lye from the dipping liquid and squeeze until the methylcellulose content in the alkali cellulose is 32%.

[0083] The squeezed alkali cellulose is pulverized to a state of 1150KG of fine loose crumbs. The pulverized alkali cellulose was left at 60°C for 2.5 hours for aging.

[0084] Add the aged alkali cellulose to a 10% sodium hydroxide aqueous solution and soak for 30 minutes for pre-alkalization, and then pass into the CS 2 Carry out yellowing reaction for 60 minutes to obtain cellulose yellow acid fat. The yellowing reaction temperature is 25 degrees, and the mass ratio of the sodium hydroxide aqueous...

Example Embodiment

[0103] Example 2

[0104] Put 350 kilograms of cotton pulp in an aqueous sodium hydroxide solution with a concentration of 18% by mass, and soak at 60° C. for 20 minutes to obtain an impregnating solution of alkali cellulose.

[0105] Add 10 grams of squeezing aid (Visco 44) to the dipping liquid, then use a squeezing machine to squeeze the dipping liquid to remove excess lye at a squeezing pressure of 0.095mpa, and squeeze until the mass percentage of methylcellulose in the alkali cellulose is 32%.

[0106] The squeezed alkali cellulose is pulverized to a state of 1140KG of fine loose crumbs. The pulverized alkali cellulose was left at 70°C for 2 hours for aging.

[0107] Add the aged alkali cellulose to a sodium hydroxide aqueous solution with a concentration of 10% by mass for 35 minutes for pre-alkalization, and then pass into the CS 2 Carry out yellowing reaction for 90 minutes to obtain cellulose yellow acid fat. The yellowing reaction temperature is 35 degrees, CS 2 The mass r...

Example Embodiment

[0125] Example 3

[0126] The process of Example 1 is adopted, the difference is that no squeezing aid is added before pressing.

[0127] The final product is tested:

[0128] Moisture in the 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] Average tearing degree in vertical and horizontal direction: 1.5N.m 2 / g;

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

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

[0136] In a humid natural environment, it can degrade naturally within 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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IPC IPC(8): C08J5/18C08L1/02
Inventor 娄尧祥陈汉爱王洪军李波许德祥
Owner 绍兴柯德新材料股份有限公司
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