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Preparation method and use of paper surface sizing agent

A technology of surface sizing agent and sizing agent, which is applied in the direction of water-repellent addition, etc., can solve the problems of large molecular weight that cannot be filled, small grooves on the paper surface and poor strength, and achieve the effect of abundant raw materials, easy operation, and low price

Active Publication Date: 2013-08-28
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, cationic starch is also a renewable resource with rich positive charges and low price. It is also used in paper surface sizing. When used as a surface sizing agent, it can improve the surface strength of paper and improve the printing adaptability of paper. Practice has proved that cationic starch can also reduce the BOD load in white water under the net in waste paper recycling; however, the modified cationic starch still has defects such as large molecular weight that cannot fill the small grooves on the paper surface and poor strength.

Method used

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  • Preparation method and use of paper surface sizing agent

Examples

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Embodiment 1

[0012] (1) Preparation of nanocrystalline cellulose colloid: using microcrystalline cellulose powder as raw material, under stirring at a stirring speed of 300r / min, slowly add microcrystalline cellulose powder according to the solid-to-liquid ratio of 1:10 In a sulfuric acid solution with a concentration of 64%, the reaction temperature is a water bath at 50°C. After reacting for 90 minutes, add water to terminate the reaction; centrifuge the obtained mixed solution in a centrifuge with a speed of 11000r / min for 5 to 6 times, and centrifuge each time 10 minutes; then put the collected nano-microcrystalline cellulose colloid in a dialysis bag with a specification of 8000-14000 until the pH of the colloid is 6-7. (2) Preparation of surface sizing agent: first, put the gelatinized cationic starch latex in a beaker and stir it on a magnetic stirrer with a rotation speed of 400r / min for 15 min, then mix the nano-microcrystalline cellulose colloid according to Add 0.1% to the catio...

Embodiment 2

[0014] (1) Preparation of nano-microcrystalline cellulose colloid: using microcrystalline cellulose powder as raw material, under stirring at a stirring speed of 300r / min, slowly add microcrystalline cellulose powder according to the solid-to-liquid ratio of 1:8 into a sulfuric acid solution with a concentration of 65%, and the reaction temperature is a water bath at 50°C. After reacting for 120 minutes, add water to terminate the reaction; centrifuge the obtained mixed solution in a centrifuge with a speed of 11000r / min for 5 to 6 times, and centrifuge each time 10 minutes; then put the collected nano-microcrystalline cellulose colloid in a dialysis bag with a specification of 8000-14000 until the pH of the colloid is 6-7. (2) Preparation of surface sizing agent: First, put the gelatinized cationic starch latex in a beaker and stir it on a magnetic stirrer with a rotation speed of 400r / min for 15 minutes, and mix the nanocrystalline cellulose colloid at 0.3 % ratio was added ...

Embodiment 3

[0016] (1) Preparation of nanocrystalline cellulose colloid: using microcrystalline cellulose powder as raw material, under stirring at a stirring speed of 290r / min, slowly add microcrystalline cellulose powder according to the solid-to-liquid ratio of 1:9 into a sulfuric acid solution with a concentration of 65%, and the reaction temperature is a water bath at 50°C. After reacting for 100 minutes, add water to terminate the reaction; centrifuge the obtained mixed solution in a centrifuge with a rotating speed of 11000r / min for 5 to 6 times, and centrifuge each time 10 minutes; then put the collected nano-microcrystalline cellulose colloid in a dialysis bag with a specification of 8000-14000 until the pH of the colloid is 6-7. (2) Preparation of surface sizing agent: First, put the gelatinized cationic starch latex in a beaker and stir it on a magnetic stirrer with a rotation speed of 300r / min for 15 min, then mix the nano-microcrystalline cellulose colloid according to Add 0....

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Abstract

The invention discloses a preparation method and a use of a paper surface sizing agent. The preparation method comprises the following steps of 1, preparing nanoscale microcrystalline cellulose colloid by hydrolyzing microcrystalline cellulose as a raw material by sulfuric acid, and 2, preparing the paper surface sizing agent by putting gelatinized cationic starch into a beaker, carrying out stirring by a magnetic stirrer, simultaneously, adding the nanoscale microcrystalline cellulose colloid into the cationic starch with stirring, and sequentially fully stirring at the same stirring rate to obtain the cationic starch composite sizing agent. A raw paper is spread on a glass plate and an end of the raw paper is fixed; a certain amount of the paper surface sizing agent is uniformly coated on the surface of the raw paper by a surface sizing rod; and the paper with the paper surface sizing agent is dried in air for a certain time and then is dried by an oven. The paper surface sizing agent can obviously improve paper surface physical properties such as tensile strength, tearability and bursting strength and has a low use amount.

Description

technical field [0001] The invention belongs to the field of papermaking surface treatment agents, and in particular relates to a preparation method and application of a paper surface sizing agent. Background technique [0002] In recent years, nanocrystalline cellulose has attracted a lot of attention as a new type of renewable nanomaterial. The width of nanocellulose is 30nm-100nm, and it can be dispersed in water to form a stable colloid. It not only has the basic structure and properties of cellulose, but also has the characteristics of nanoparticles, such as huge specific surface area (70), high strength (7500MPa), high hardness (100-140GPa), etc. Because of its unique properties, nanocrystalline cellulose has been widely used in papermaking, textile, fine chemical and other fields. [0003] With the continuous development of the current papermaking, printing and related fields, the requirements for surface sizing agents to improve the surface properties and printing...

Claims

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Application Information

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IPC IPC(8): D21H21/16C08B15/02
Inventor 唐艳军杨淑杰张俊华
Owner ZHEJIANG SCI-TECH UNIV
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