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Nano cellulose composite material and preparation method and application thereof

A technology of nanocellulose and composite materials, which is applied in the field of nanocellulose composite materials and its preparation, can solve the problems of cracks and breakage of ultra-thin glass, excessive thermal expansion coefficient, non-recyclability, etc., and achieves low pollution and good hydrophobicity. The effect of high performance and low preparation cost

Active Publication Date: 2019-07-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal foil has good barrier properties, mechanical strength and temperature resistance, but poor light transmission; ultra-thin glass is prone to cracks and breakage; polymer matrix is ​​light, flexible and impact resistant, but the thermal expansion coefficient (CTE) too large, surface rough, not recyclable; nanocellulose composites have potential as flexible display substrates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Preparation of nanocellulose:

[0035] (1) Prepare bleached softwood pulp with distilled water to form a pulp suspension with a mass fraction of 1%, let it stand for 6 hours, then use a standard pulp decomposer to decompose the suspension for 20 minutes, and use an ultrafine grinder to decompose the decomposed pulp Carry out grinding treatment, the grinding speed is 1000rmp, the disc grinding distance is -120μm, and the grinding time is 1.5h, to obtain the cellulose microfibril suspension;

[0036] (2) Take 1 g of cellulose microfibril suspension in an absolute dry weight and place it in a conical flask, then measure 61.0 mL of Na with a concentration of 0.2 mol / L 2 HPO 4 12H 2 O solution and 39.0 mL of NaH with a concentration of 0.3 mol / L 2 PO4·2H 2 After the O solution is mixed evenly, it is added as a buffer solution into the conical flask filled with cellulose microfibrils, after adjusting pH=7, dilute the concentration of the cellulose microfibril suspension ...

Embodiment 2

[0046] 1. Preparation of nanocellulose:

[0047] (1) Prepare the bleached softwood pulp into a 2% pulp suspension with distilled water, let it stand for 7 hours, then use a standard pulp decomposer to decompose the suspension for 30 minutes, and use an ultrafine grinder to grind the decomposed pulp , the grinding speed is 2000rmp, the disc grinding distance is -100 μm, the grinding time is 2h, and the cellulose microfibril suspension is obtained;

[0048] (2) Take 1 g of cellulose microfibril suspension in an absolute dry weight and place it in a conical flask, then measure 61.0 mL of Na with a concentration of 0.2 mol / L 2 HPO 4 12H 2 O solution and 39.0 mL of NaH with a concentration of 0.3 mol / L 2 PO4·2H 2 After the O solution is mixed evenly, it is added as a buffer solution into an Erlenmeyer flask filled with cellulose microfibrils. After adjusting pH=7, the concentration of the cellulose microfibril suspension is diluted to 0.1 wt% with distilled water, and then the ...

Embodiment 3

[0058] 1. Preparation of nanocellulose:

[0059] (1) Prepare the bleached softwood pulp into a 3% pulp suspension with distilled water, let it stand for 8 hours, then use a standard pulp decomposer to decompose the suspension for 40 minutes, and grind the decomposed pulp with an ultrafine grinder Treatment, the grinding speed is 3000rmp, the disc grinding distance is -80μm, and the grinding time is 2.5h, to obtain the cellulose microfibril suspension;

[0060] (2) Take 1 g of cellulose microfibril suspension in an absolute dry weight and place it in a conical flask, then measure 61.0 mL of Na with a concentration of 0.2 mol / L 2 HPO 4 12H 2 O solution and 39.0 mL of NaH with a concentration of 0.3 mol / L 2 PO4·2H 2 After the O solution is mixed evenly, it is added as a buffer solution into the conical flask filled with cellulose microfibrils, after adjusting pH=7, dilute the concentration of the cellulose microfibril suspension to 0.2wt% with distilled water, and then place ...

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Abstract

The invention provides a nano cellulose composite material and a preparation method and application thereof. The preparation method uses nanocellulose as a raw material, nanocellulose is oxidized by using a TEMPO / NaClO / NaBr oxidation system, amidation modification of oxidized nanocellulose is carried out with hexadecylamine as a monomer, after natural vegetable oil is added, a film is prepared bya tape casting method, and under a negative pressure condition, the film is compounded with polyurethane acrylic resin through impregnation, so that the nano cellulose composite material is obtained and has the biodegradability and recyclability of cellulose, and at the same time is endowed with good hydrophobicity, resistance to thermal expansion, flexibility and light transmission, is an ideal flexible screen matrix material, and has broad application prospects in the field of flexible screen matrix materials.

Description

technical field [0001] The invention belongs to the technical field of nano-cellulose composite material preparation, and in particular relates to a nano-cellulose composite material and its preparation method and application. Background technique [0002] With the continuous maturity of organic light-emitting materials and device development technologies, flexible organic light-emitting diodes (FOLEDs) are regarded as one of the most promising technologies for future displays. The substrate is an important part of the FOLED structure, and the performance of the substrate seriously affects the performance, safety and service life of the FOLED. Metal foil has good barrier properties, mechanical strength and temperature resistance, but poor light transmission; ultra-thin glass is prone to cracks and breakage; polymer matrix is ​​light, flexible and impact resistant, but the thermal expansion coefficient (CTE) is too large, the surface is rough, and it is not recyclable; nanoc...

Claims

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Application Information

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IPC IPC(8): C08J7/00C08J5/18C08L1/04C08L91/00C08B15/06C08B15/04D21C9/00D21H17/00
CPCC08J7/00C08J5/18C08B15/06C08B15/04D21C9/001D21H17/005C08J2301/04C08J2491/00C08J2475/14
Inventor 宋雪萍徐荧杨爽张彩红吴敏何辉聂双喜王双飞
Owner GUANGXI UNIV
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