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Preparation method of high-melting-point AKD type surface sizing agent

A surface sizing agent, high melting point technology, applied in the direction of adding water repellent, can solve the problems of no obvious improvement in the surface strength of paper, slow AKD curing speed, poor sizing effect, etc., to improve water resistance and film formation. performance, improvement of paper surface strength, effect of improving surface strength

Active Publication Date: 2020-03-13
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] ①AKD surface sizing agent is usually mixed with surface sizing starch, but due to the high temperature of surface sizing starch (55-70°C), which greatly exceeds the melting point of AKD wax (47-50°C), it is easy to cause AKD to hydrolyze, resulting in sizing The gluing effect becomes worse, and the sizing roller is also easily polluted;
[0004] ②AKD type products, whether it is pulp AKD sizing agent or the esterification reaction between AKD sizing agent and cellulose hydroxyl group on the surface, is a relatively slow process, so there are generally slow aging speeds after AKD sizing and sizing lag. , thus limiting the application of AKD products;
[0005] ③Compared with styrene-acrylic surface adhesive (SAE), AKD surface sizing agent products have poor film-forming properties and have no significant effect on improving the surface strength of paper

Method used

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  • Preparation method of high-melting-point AKD type surface sizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of high melting point AKD type surface sizing agent, comprising the following steps:

[0025] Step 1. Preparation of starch emulsifier: in terms of mass percentage, add 30% deionized water to the reactor, add 20% tapioca oxidized starch under stirring, continue stirring for 30 minutes, then heat up to 40°C, then add 5% liquid caustic soda , keep warm for 20min, continue to heat up to 65°C, add 7% cationic etherification agent, keep warm for 20min, continue to heat up to 73°C, keep warm for 3.5h, stop stirring for 3h, add 27% water, 10% glacial acetic acid to adjust the pH value to 3.5 , after cooling down to 60°C, add 1% dispersant N, stir for 20 minutes and start to heat up to 92°C, keep warm for 50 minutes, and then continue to cool down to 65°C to obtain a starch emulsifier;

[0026] Step 2. Prepare the finished product: Add 26% deionized water and 0.06% dispersant N to the shearing tank in terms of mass percentage, add the 10% starch emulsifier ...

Embodiment 2

[0028] A preparation method of high melting point AKD type surface sizing agent, comprising the following steps:

[0029] Step 1. Preparation of starch emulsifier: in terms of mass percentage, add 35% deionized water to the reaction kettle, add 19% tapioca oxidized starch under stirring, continue stirring for 20 minutes, then heat up to 45°C, then add 6% liquid caustic soda , keep warm for 30 minutes, continue to heat up to 60°C, add 9% cationic etherification agent, keep warm for 30min, continue to heat up to 76°C, keep warm for 3h, stop stirring for 4h, add 20% water, 9% glacial acetic acid to adjust the pH value to 5.5, After cooling down to 65°C, add 2% dispersant N, stir for 30 minutes and start to heat up to 95°C, keep warm for 60 minutes, and then continue to cool down to 60°C to obtain a starch emulsifier;

[0030] Step 2. Prepare the finished product: add 30% deionized water and 0.03% dispersant N to the shearing tank in terms of mass percentage, add the 8.24% starch ...

Embodiment 3

[0032] A preparation method of high melting point AKD type surface sizing agent, comprising the following steps:

[0033] Step 1. Preparation of starch emulsifier: In terms of mass percentage, add 32% deionized water to the reaction kettle, add 18% tapioca oxidized starch under stirring, continue stirring for 25 minutes, then heat up to 42°C, and then add 5.5% liquid caustic soda , keep warm for 25min, continue to heat up to 62°C, add 8% cationic etherification agent, keep warm for 26min, continue to heat up to 75°C, keep warm for 3.4h, stop stirring for 3.5h, then add 30% water and 5% glacial acetic acid to adjust the pH value to 4. After cooling down to 62°C, add 1.5% dispersant N, stir for 25 minutes and start to heat up to 94°C, keep warm for 55 minutes, and then continue to cool down to 62°C to obtain a starch emulsifier;

[0034]Step 2. Prepare the finished product: add 25% deionized water and 0.05% dispersant N to the shearing tank in terms of mass percentage, and add 5...

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Abstract

The invention discloses a preparation method of a high-melting-point AKD type surface sizing agent. The preparation method comprises the following steps: adding AKD wax powder into a reaction kettle,heating, and keeping the temperature until the AKD wax powder is completely molten to obtain a wax powder solution for later use; adding deionized water and a dispersing agent N into a shearing tank,heating to a certain temperature, adding a starch emulsifier, a polymer emulsifier and zirconium oxychloride, adding the wax powder solution, starting a shearing machine, homogenizing obtained shearedraw materials twice by adopting a homogenizing machine, quickly cooling by adopting plate exchanger, adding water and iron-free aluminum sulfate, and finally adding a proper amount of a bactericide to obtain the AKD type surface sizing agent. The AKD type surface sizing agent prepared by the method has good on-machine performance, good sizing effect, high temperature resistance, high curing speedand high cleanliness, also has the characteristic of improving paper surface strength, helping paper mill to reduce sizing cost, and improving product quality.

Description

technical field [0001] The invention relates to the field of sizing agent preparation, in particular to a preparation method of a high melting point AKD surface sizing agent. Background technique [0002] With the development of papermaking technology, the reduction of the amount of internal sizing agent and the active application of surface sizing agent have become the mainstream. Surface sizing agents are used in many types of paper such as coated base paper, printing offset paper, electrostatic copy paper, newsprint and lining boards. In the future, the role of surface sizing agents will become more and more important. Surface sizing agents can be divided into high-molecular and low-molecular systems according to their molecular structure. As the polymer system (polymer), there are mainly styrene acrylic acid copolymer (SAE), styrene-acrylic acid copolymer (SMA), etc.; the low molecular system includes alkyl ketene dimer (AKD), olefin succinate ( ASA) etc. Among them, ...

Claims

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Application Information

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IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 何辉董超吴恒李庆秋李回陵
Owner YUEYANG FOREST & PAPER CO LTD
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