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Pre-activated-cellulose thermoplastic material and preparation method thereof

A thermoplastic material and cellulose technology, which is applied in the field of activated pretreatment cellulose thermoplastic material and its preparation, can solve the problems of low production efficiency, insufficient plasticization of cellulose, and insufficient plasticization of cellulose, and achieve Effect of reduced crystallinity, increased accessibility, good flexibility and toughness

Inactive Publication Date: 2017-05-31
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution method requires a large amount of solvent, and the production efficiency is low, so the melt processing method is a more ideal processing method. Although the existing melt processing method realizes the thermoplastic processing of cellulose, the cross section of the material can still be seen as plasticized cellulose particles , the cellulose is not fully plasticized, such as the Chinese invention patents with publication numbers 104163943A and 104194059A respectively, the addition of ionic liquids only plasticizes the surface of the cellulose, and does not fully plasticize the interior of the cellulose

Method used

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  • Pre-activated-cellulose thermoplastic material and preparation method thereof
  • Pre-activated-cellulose thermoplastic material and preparation method thereof
  • Pre-activated-cellulose thermoplastic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The bleached kraft wood pulp was crushed into segments with a length of 2 mm and a width of 2 mm, and vacuum-dried at 105° C. for 2 hours. Take 20g of dried cellulose and grind it on a planetary ball mill for 4 hours. The grinding balls are zirconia balls with a diameter of 20mm and 10mm and a quality of 300g. The grinding speed is 540r / min to obtain activated cellulose powder. The particle size of the obtained activated cellulose powder is It is 1-10μm, and the crystallinity is about 0. figure 1 It is the XRD figure before and after the cellulose activation treatment of embodiment 1, after the activation treatment, the cellulose crystallinity reduces; figure 2 It is the infrared image of the cellulose before and after the activation treatment of Example 1. After the activation treatment, the hydroxyl stretching vibration of the cellulose moves to a higher wave number, indicating more free hydroxyl groups or weaker hydrogen bonding.

[0036] Mix the prepared activated...

Embodiment 2

[0038]The bleached kraft wood pulp was crushed into segments with a length of 2 mm and a width of 2 mm, and vacuum-dried at 105° C. for 2 hours. Take 20g of dried cellulose and grind it on a planetary ball mill for 3h. The grinding balls are zirconia balls with a diameter of 20mm and 10mm and a quality of 300g. The grinding speed is 540r / min to obtain activated cellulose powder. The particle size of the obtained activated cellulose powder is It is 15-20μm, and the crystallinity is 20%.

[0039] Mix the prepared activated cellulose powder and 1-allyl-3-methylimidazolium chloride salt in a mass ratio of 50:50 on a high-speed mixer for 5 minutes, then knead the premixed material on an open mill for 20 minutes, and start The kneading temperature is 135° C., and the roller pitch is 0.2 mm to obtain an activated pretreated cellulose thermoplastic material that can be repeatedly thermoformed.

Embodiment 3

[0041] The bleached kraft wood pulp was crushed into segments with a length of 2 mm and a width of 2 mm, and vacuum-dried at 105° C. for 2 hours. Take 20g of dried cellulose and grind it on a planetary ball mill for 2h. The grinding balls are zirconia balls with a diameter of 20mm and 10mm and a quality of 300g. The grinding speed is 540r / min to obtain activated cellulose powder. The particle size of the obtained activated cellulose powder is It is 30-50μm, and the crystallinity is 33.3%.

[0042] Mix the prepared activated cellulose powder and 1-allyl-3-methylimidazolium chloride salt in a mass ratio of 50:50 on a high-speed mixer for 5 minutes, then knead the premixed material on an open mill for 20 minutes, and start The kneading temperature is 135° C., and the roller pitch is 0.2 mm to obtain an activated pretreated cellulose thermoplastic material that can be repeatedly thermoformed.

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Abstract

The invention discloses a pre-activated-cellulose thermoplastic material, comprising activated cellulose powder and ionic liquid in a mass ratio of 4: 1 to 1: 1, wherein the activated cellulose powder is cellulose powder obtained through mechanical grinding of natural cellulose and has a particle size of 1 to 100 [mu]m. The invention also discloses a preparation method for the cellulose thermoplastic material. The preparation method comprises the following steps: subjecting cellulose to grinding and activation pretreatment; then mixing the pre-activated cellulose with the ionic liquid; and carrying out mixing on thermal forming equipment. Through activation pretreatment of cellulose, the hydrogen bond and crystal structure of cellulose are effectively destroyed, so more free hydroxyl groups of cellulose are exposed and sufficient plasticization of cellulose is effectively promoted; and the prepared pre-activated-cellulose thermoplastic material has a smooth and continuous section and can repeatedly undergo thermoplastic forming, and the ionic liquid in the material can be totally removed so as to obtain cellulose I.

Description

technical field [0001] The invention relates to the technical field of natural polymer materials. More specifically, it relates to an activated pretreated cellulose thermoplastic material and a preparation method thereof. Background technique [0002] Cellulose has been widely used in fiber, papermaking, film, polymer, coating and other industrial fields due to its abundant sources, low price, biodegradability and environmental compatibility. Due to the existence of a large number of hydrogen bonds in and between molecules of natural cellulose, and the complexity of cellulose aggregate structure and high crystallinity, cellulose is insoluble in general water, acetone, toluene and other organic solvents. It decomposes without melting, and cannot be molded like traditional plastics. In order to realize the thermoplastic processing of cellulose, it is necessary to break the hydrogen bonds in and between the cellulose macromolecules and weaken the intermolecular forces of cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K5/3445
Inventor 赵猛猛吴敏黄勇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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