Method for determining retention rate of fluorescent whitening agent in pulp fiber system

A technology for optical brighteners and pulp fibers, which is applied in the measurement of color/spectral properties, etc., can solve the problems of complex measurement steps, difficult to master, and poor operability, and achieve easy mastery, strong operability, and simple measurement steps. Effect

Inactive Publication Date: 2009-10-21
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The measurement steps of this method are more complicated and require a higher theoretical basis and the cooperation of precisio

Method used

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  • Method for determining retention rate of fluorescent whitening agent in pulp fiber system
  • Method for determining retention rate of fluorescent whitening agent in pulp fiber system
  • Method for determining retention rate of fluorescent whitening agent in pulp fiber system

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Embodiment

[0039] A method for measuring the retention rate of fluorescent whitening agent on the pulp fiber surface, selected 1), experimental raw materials, medicine, filter membrane material and experimental equipment and 2), concrete experimental process are described as follows respectively:

[0040] 1) Experimental raw materials

[0041] pulp

[0042] Softwood (spruce) bleached kraft pulp (brightness 87.2% ISO, freeness 470ml CSF) and hardwood (eucalyptus) bleached kraft pulp (brightness 88.4% ISO, freeness 490ml CSF) were produced by Canada Tembec Inc. supply;

[0043] drug

[0044] Fluorescent whitening agent (Tinopal ABP-A) is provided by Swiss Ciba Chemical Company;

[0045] Filter material:

[0046] The 0.1μm filter membrane (made of nylon) is provided by MAGNA Company of the United States;

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Abstract

The invention discloses a method for determining the retention rate of a fluorescent whitening agent in a pulp fiber system by utilizing an ultraviolet spectrophotometer, namely the amount of the fluorescent whitening agent in a filtrate is quantified through the ultraviolet spectrophotometer, and the retention rate of the fluorescent whitening agent in the fiber system is calculated based on a mass conservation principle. The determination method comprises the following steps of production of a standard curve, collection of the filtrate, pretreatment on the filtrate, determination of the ultraviolet spectrophotometer, determination of a blank sample, and calculation, and a determined result has smaller deviation and good reproducibility. The invention is the method with simplicity, easy operation and good reproducibility for determining the retention rate of the fluorescent whitening agent on the surface of pulp fiber.

Description

technical field [0001] The invention relates to the retention rate of the fluorescent whitening agent in the pulp fiber system, in particular to a method for measuring the retention rate of the fluorescent whitening agent in the pulp fiber system. Background technique [0002] Fluorescent whitening agent, also known as optical brightener, is an almost colorless fluorescent organic compound, which has the property of converting invisible ultraviolet light into visible light, so the treated pulp fiber will be It will emit blue or purple light, which can offset the yellow or off-white in the fiber, and play a role of complementary color, showing pure white. Since whiteness or chroma is an important quality index for evaluating pulp or paper, fluorescent whitening agents are often used in various paper products to improve the whiteness of pulp and improve the visual quality of paper products. The whitening effect of the fluorescent whitening agent mainly depends on the retentio...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 张红杰胡惠仁
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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