Coating composition of nano cellulose, its uses and a method for its manufacture

一种纳米纤维素、组合物的技术，应用在水性涂料组合物领域

Inactive Publication Date: 2015-07-15
PAPER & FIBER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] The occurrence of nanocellulose fibril aggregation at higher nanocellulose concentration levels makes it challenging to obtain high viscosity and low concentration nanocellulose dispersions

Method used

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  • Coating composition of nano cellulose, its uses and a method for its manufacture
  • Coating composition of nano cellulose, its uses and a method for its manufacture
  • Coating composition of nano cellulose, its uses and a method for its manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1a

[0082] Example 1a. Preparation of Microfibrillated Cellulose (Nanocellulose)

[0083] The cellulose selected for the production of microfibrillated cellulose was obtained from Bleached long-fiber kraft kraft pulp (Kraft pulp) (fully bleached kraft pulp mainly based on spruce that is completely chlorine-free). Kraft pulp was mechanically treated in a Claflin cone homogenizer using a specific energy consumption of 2000 kWh / ton combined with homogenization. Homogenization was done using a high pressure homogenizer (model 12.56VH, APV, Rannie LAB) at a consistency of 0.5 to 1% with 5 passes and a pressure of 1000 bar [8].

Embodiment 1b

[0084] Example 1b. Preparation of Microfibrillated Cellulose (Nanocellulose)

[0085] The cellulose selected for the production of microfibrillated cellulose was obtained from Bleached long-fiber kraft kraft pulp (fully bleached kraft pulp mainly based on spruce that is completely chlorine-free). Kraft pulp was mechanically treated in a Claflin cone homogenizer using a specific energy consumption of 2000 kWh / ton combined with homogenization. Homogenization was done using a high pressure homogenizer (model 12.56VH, APV, Rannie LAB) at a consistency of 0.5 to 1% with 5 passes and a pressure of 1000 bar [8].

[0086] Nanocellulose concentrates (1% to 4%) are obtained by centrifugation or evaporation from 0.5% to 1.0% aqueous dispersions of nanocellulose produced by the homogenization process. Centrifugation was performed in a Heraeus 400R (Thermo Fisher Scientific Inc., Waltham, MA, USA) at 2500 rpm and 22°C during 60 minutes. This treatment is repeated until the desired con...

Embodiment 2

[0087] Example 2. Preparation and testing of compositions according to the invention

[0088] Table 1: Surfactants selected for testing

[0089]

[0090] According to principles known to those skilled in the art, cationic surfactants according to Table 2 were added to 1% to 4% of the aqueous dispersion of nanocellulose (Example 1b). The composition was stirred for 10 minutes after adding the surfactant and the pH of the composition was adjusted to neutral pH (pH 6 to 7) by adding HCl and / or NaOH. The compositions were evaporated to different dry matter contents (2.24% to 5.55%) in an oven at 75°C. A summary about sample preparation and its rheological testing is shown in Table 2.

[0091] Table 2: Summary table of tests performed on different solutions

[0092]

[0093] Rheological measurement

[0094] The low-shear and oscillatory rheological properties of the nanocellulose dispersions were measured on a Physica MCR 301 (Anton Paar GmbH, Graz, Austria) rotationa...

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Abstract

The invention relates to an aqueous coating composition of nano cellulose (e.g. microfibrillated cellulose), characterized in that has a dry matter concentration of 2%-12% of nano celluloseand comprises at least one cationic surfactant, which may be chosen among Hexadecyltrimethyl-ammonium bromide,Octadecyltrimethyl- ammonium bromide,Hexadecylpyridinium chloride andTetradecyltrimethyl- ammonium bromide, Dodecylpyridinium chloride. The invention also pertains to use of the composition as a coating layer and as an oxygen barrier layer. Further it relates to substrates, e.g. board, cardboard or paper coated with the composition. Moreover, the invention pertains to a process for preparing the coating composition.

Description

field of invention [0001] The present invention relates to an aqueous coating composition of nanocellulose, characterized in that said composition has a concentration of nanocellulose dry matter of 2% to 12% by weight of the composition and comprises at least one cationic surface active agent. [0002] The invention also relates to the use of the composition as a coating, in particular as an oxygen barrier or smoothing layer. The invention also covers substrates coated with the composition, such as board, cardboard, printing paper or liquid packaging board. In addition, a method for producing the composition is disclosed. Background technique [0003] [1] and Herrick et al. [2] described the manufacture and characterization of nanocellulose, such as certain types of microfibrillated cellulose from wood fibers, in the 1980s. Nanocellulose is obtained by forcing a suspension of cellulose fibers under high pressure through a mechanical comminution device. This procedure res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/52C09D101/00C09D101/02C09D101/04C09D101/06C08K5/17C08K5/19C08L1/02D21H19/34
CPCC09D101/00C09D101/06D21H19/34C08L1/02C09D101/04C09D101/02B41M5/5236C08K5/17C08K5/19D21H19/12Y10T428/31971Y10T428/31982
Inventor 马可·约蒂
Owner PAPER & FIBER RES INST
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