Fluorescent vegetable fiber and preparation method thereof as well as fluorescent paper and application thereof

A plant fiber and fluorescent technology, applied in the field of fluorescent paper, can solve the problems of difficult redispersion, high equipment requirements, and high price, and achieve the effects of mild reaction conditions, excellent fluorescence intensity, and simple preparation methods

Active Publication Date: 2019-07-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the phosphor powder prepared by this method still has the problem of being difficult to disperse in the next step of application.
At t

Method used

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  • Fluorescent vegetable fiber and preparation method thereof as well as fluorescent paper and application thereof
  • Fluorescent vegetable fiber and preparation method thereof as well as fluorescent paper and application thereof
  • Fluorescent vegetable fiber and preparation method thereof as well as fluorescent paper and application thereof

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preparation example Construction

[0055] According to the first aspect of the present invention, a kind of preparation method of fluorescent plant fiber is provided, comprising the following steps:

[0056] (a) plant fiber slurry is provided, and the TEMPO catalytic oxidation system is used to oxidize the plant fiber to obtain carboxyl-containing plant fiber;

[0057] (b) Disperse the carboxyl-containing plant fibers obtained in step (a) in water, then add an aqueous solution containing rare earth ions, so that the carboxyl-containing plant fibers absorb rare earth ions, then add a precipitating agent for precipitation reaction, and obtain fluorescence after post-treatment plant fibres;

[0058] Precipitating agent is sodium fluoride or potassium fluoride.

[0059] The time for the precipitation reaction in step (b) is not limited, and it is sufficient to determine that the precipitation is complete by using methods commonly used in the art. For example, the time for the precipitation reaction can be 3-5 hour...

Embodiment 1

[0102] (1) a preparation method of fluorescent plant fiber, comprising the following steps:

[0103] (1) plant fiber containing carboxyl group

[0104] Plant fiber slurry is provided (the kind of plant fiber in the plant fiber slurry is coniferous wood fiber, and the beating degree of plant fiber slurry is 70 ° SR), takes by weighing the plant fiber slurry containing 1.0g dry fiber, and the plant fiber The slurry was added to deionized water to obtain a slurry with a dry fiber content of 1% wt.

[0105] Add TEMPO reagent (the add-on of TEMPO reagent is 0.015g) and sodium bromide (the add-on of sodium bromide is 0.1g) in the slurry of 1%wt, after mechanical stirring 25min, dropwise add NaClO aqueous solution (available chlorine The content is 6% (g / 100mL), the amount of NaClO added is 6g), the pH value is maintained at 10.5, the temperature is 25°C, and the reaction is carried out for 4h under stirring conditions. After the reaction is finished, it is purified by suction filt...

Embodiment 2

[0116] (1) a preparation method of fluorescent plant fiber, comprising the following steps:

[0117] (1) plant fiber containing carboxyl group

[0118] Plant fiber slurry is provided (the kind of plant fiber in the plant fiber slurry is hardwood fiber, and the beating degree of plant fiber slurry is 65 ° SR), takes by weighing the plant fiber slurry containing 1.0g dry fiber, and the plant fiber The slurry was added to deionized water to obtain a slurry with a dry fiber content of 1% wt.

[0119] Add TEMPO reagent (the add-on of TEMPO reagent is 0.016g) and sodium bromide (the add-on of sodium bromide is 0.1g) in the slurry of 1%wt, after mechanical stirring 25min, dropwise add NaClO aqueous solution (available chlorine The content is 6% (g / 100mL), the amount of NaClO added is 8g), the pH value is maintained at 10.5, the temperature is 25°C, and the reaction is carried out under stirring conditions for 3h. After the reaction is finished, it is purified by suction filtration ...

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Abstract

The invention provides fluorescent vegetable fibers and a preparation method thereof as well as fluorescent paper and application thereof and belongs to the technical field of fluorescent paper. The preparation method of the fluorescent vegetable fibers comprises the following steps: providing vegetable fiber pulp; oxidizing the vegetable fibers by utilizing a TEMPO (2,2,6,6-Tetramethylpiperidinooxy) catalytic oxidation system, so as to obtain carboxyl-containing vegetable fibers; then dispersing the carboxyl-containing vegetable fibers in water, and adding a water solution containing rare earth ions, so as to enable the carboxyl-containing vegetable fibers to adsorb the rare earth ions; then adding a precipitation agent and carrying out precipitation; then carrying out post-treatment to obtain the fluorescent vegetable fibers. The method is simple and mild in reaction conditions; no expensive raw materials or instruments are needed and large-scale production can be realized. The prepared fluorescent vegetable fibers are applied to the fluorescent paper, have excellent fluorescence intensity, writability, flexibility and the like and can be used as anti-counterfeiting paper to be applied to a functional packaging material. The utilized natural vegetable fibers can be completely biodegraded and no secondary pollution is caused.

Description

technical field [0001] The invention belongs to the technical field of fluorescent paper, and in particular relates to a fluorescent plant fiber and a preparation method thereof, fluorescent paper and an application thereof. Background technique [0002] With the development of the economy and the improvement of people's living standards, the people's demand for high-end products is increasing. The subsequent counterfeiting of goods also emerges in an endless stream, especially in the fields of medicines, cosmetics, tobacco and alcohol, which not only cause serious economic losses, but also endanger the health of consumers. Therefore, in order to accurately identify the authenticity of products, combat and stop counterfeiting, various anti-counterfeiting technologies are used in industrial production. As a special fiber that can generate visible light under the excitation of ultraviolet light, fluorescent fiber has a good anti-counterfeiting effect and can be used as a safe...

Claims

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Application Information

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IPC IPC(8): C08H8/00C08B15/05C08B15/04D21H27/00D21H11/00D21H11/12D21D1/02
CPCC08B15/04C08B15/05C08H8/00D21D1/02D21H11/00D21H11/12D21H27/00
Inventor 陈广学王青田君飞陈奇峰王小芳
Owner SOUTH CHINA UNIV OF TECH
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