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CNF cellular solid material with anionic surfactants

A technology of surfactants and porous solids, applied in flexible coverings, fiber raw material treatment, cellulose pulp post-treatment modification, etc., can solve the problems such as the difficulty in preparing large foams without cracks, and achieve good mechanical properties Effect

Active Publication Date: 2017-08-29
CELLUTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare bulky foam without cracks using this method

Method used

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  • CNF cellular solid material with anionic surfactants
  • CNF cellular solid material with anionic surfactants
  • CNF cellular solid material with anionic surfactants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] Porous solid materials according to the invention and comparative examples are illustrated in the following examples.

[0088] Material

[0089] Cellulose Nanofibers (CNF). Different grades of Cellulose Nanofibers (CNF) were used to prepare porous solid materials. The different levels are described below.

[0090] Similar to a previously described method (Henriksson et al., 2007), enzyme-modified CNF (Enz-CNF) was prepared from pulp fibers subjected to enzymatic pretreatment and then defibrillated in a high-pressure homogenizer.

[0091] TEMPO-CNF was prepared from commercial sulfite softwood dissolving pulp with 4.5% hemicellulose content and 0.6% lignin content ( Dissolving Pulp; Fabriker AB, Sweden) prepared. The non-dried dissolving pulp fibers were oxidized using TEMPO according to the method previously described (Saito et al. 2007). The fibers were suspended in water containing TEMPO and NaBr. TEMPO-mediated oxidation of cellulose fibers was initiated ...

Embodiment 15

[0116] Example 15 illustrates porous solid materials dried at different temperatures.

Embodiment 1

[0118] Different types of surfactants were used to prepare porous solid CNF materials with retained porous structures. 30 g of TEMPO-oxidized anionic CNF dispersion (0.5 wt%, surface charge 983 μeq / g) were combined with different anionic surfactants, see Table 1 . The different combinations were mixed, adjusted to pH 8, and foamed for 5-10 minutes using a laboratory mechanical stirrer at 2000 rpm with a small impeller (diameter = 3 cm). The resulting wet foam was poured into plastic trays and dried in a fan oven at 40°C. Table 1 shows that a variety of anionic surfactants can be used to prepare porous solid CNF materials with retained porous structure. These examples were not optimized with respect to surfactant amount, density, pore size, thickness or mechanical properties.

[0119] Table 1. Porous solid CNF materials containing different surfactants.

[0120]

[0121] *) Calculated based on the total weight of the porous solid material

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Abstract

The present invention relates to cellular solid materials comprising cellulose nanofibers (CNF) and an anionic surfactant, a method for preparation of such materials, as well as their use.

Description

technical field [0001] The present invention relates to porous solid materials comprising cellulose nanofibers (CNF) and anionic surfactants, processes for the preparation of such materials, and their use. Background technique [0002] In our daily life, macroporous and microporous materials mainly made of petroleum-based polymers are used in various forms and compositions. Examples of these are insulation materials for buildings and aircraft and polymer foams for packaging. Foams for such applications must be stable, lightweight and easy to manufacture. [0003] Due to the growing awareness of the need to use renewable materials, there is a strong need to replace petroleum-based polymers with polymers derived from renewable resources. Cellulose holds unique potential as the most abundant renewable natural polymer on Earth, with a crystalline structure and amenable to large-scale industrial production methods. Long nanofibrils in plants are filled with cellulose chains wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/30D21H11/16D21H11/18D21H21/56D21H27/10
CPCC08J9/0052C08J9/30D21H11/16D21H11/18D21H21/56D21H27/10C08J2301/02B01J20/24B01J20/28045C08J9/0023C08J9/0033C08J2201/0504C08J2205/00D21F3/02D21F5/18D21H11/20D21H17/09D21H17/14D21H21/14
Inventor E.约翰逊N.张塞尔温L-E.维格伯格
Owner CELLUTECH
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