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A kind of anionic liquid AKD neutral sizing agent and preparation method thereof

A technology of neutral sizing agent and anionic monomer, applied in the direction of water-repellent addition, etc., can solve problems such as small slip coefficient, affect paper whiteness, strong dependence on aluminum sulfate, etc., achieve strong emulsification ability and improve paper formation quality effect

Inactive Publication Date: 2019-07-05
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional anionic sizing agent is mainly anionic rosin size, which will not affect the whiteness of paper when used together with fluorescent whitening agent. However, this type of sizing agent is too dependent on aluminum sulfate and is only suitable for acidic papermaking. At this stage, it is mainly a medium-alkaline papermaking environment, so the traditional anionic rosin gum is basically no longer used
In order to meet the medium-alkaline papermaking environment, cationic neutral sizing agents including AKD are widely used, but such sizing agents will react with fluorescent whitening agents and affect paper whiteness
[0004] Liquid alkyl ketene dimer (liquid AKD), also known as branched alkyl ketene dimer, is a new type of paper-making sizing agent emerging in China. It is a liquid oily substance at room temperature. This type of sizing agent Compared with the traditional alkyl ketene dimer (AKD), it has the advantages of fast curing speed, high sizing efficiency, and small slip coefficient, which has attracted widespread attention. However, the prior art does not involve the neutral application of anionic liquid AKD. Glue and its preparation method

Method used

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  • A kind of anionic liquid AKD neutral sizing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] The preparation method of anionic liquid AKD neutral sizing agent, according to the following steps:

[0036] 1) Add 15g polyvinyl alcohol and 350g distilled water into a three-necked flask equipped with stirring;

[0037] 2) Add 10g of styrene, 5g of butyl acrylate, 5g of tert-butyl acrylate, 50g of acrylamide, and 20g of acrylic acid into a three-necked flask;

[0038] 3) Adjust the pH to 3 with glacial acetic acid, stir and mix for 0.5h, then raise the temperature to 85°C;

[0039] 4) Add 30g ammonium persulfate solution (0.1% total monomer mass) dropwise within 1.5h;

[0040] 5) Heat up to 95°C and keep it warm for 3 hours, then cool and discharge to obtain a light yellow viscous substance, which is the anionic polymer emulsifier for liquid AKD;

[0041] 6) Add 50g of liquid AKD, 50g of special anionic polymer emulsifier for liquid AKD and 50g of distilled water into a three-necked flask with stirring;

[0042] 7) Heat up to 35°C;

[0043] 8) Adjust the speed to...

Embodiment 2

[0046] The preparation method of anionic liquid AKD neutral sizing agent, according to the following steps:

[0047] 1) Add 20g sodium polyacrylate and 350g distilled water into a three-neck flask equipped with stirring;

[0048] 2) Add 10g of styrene, 7.5g of butyl methacrylate, 7.5g of isobutyl methacrylate, 60g of acrylamide, 15g of acrylic acid and 5g of itaconic acid into a three-necked flask;

[0049] 3) Adjust the pH to 5 with glacial acetic acid, and raise the temperature to 90°C;

[0050] 4) Add 30g ammonium persulfate solution (0.1% total monomer mass) dropwise within 1.5h;

[0051] 5) Raise the temperature to 95°C and keep it warm for 2 hours, then cool and discharge to obtain a light yellow viscous substance, which is the anionic polymer emulsifier for liquid AKD;

[0052] 6) Add 50g of liquid AKD, 50g of special anionic polymer emulsifier for liquid AKD and 50g of distilled water into a three-necked flask with stirring;

[0053] 7) Control the temperature to 30°C...

Embodiment 3

[0057] The preparation method of anionic liquid AKD neutral sizing agent, according to the following steps:

[0058] 1) Add 20g polyethylene glycol and 350g distilled water into a three-necked flask equipped with stirring;

[0059] 2) Add 20g of styrene, 5g of ethyl acrylate, 5g of isooctyl methacrylate, 50g of acrylamide, and 20g of styrenesulfonic acid into a three-necked flask;

[0060] 3) Adjust the pH to 4 with glacial acetic acid and raise the temperature to 85°C;

[0061] 4) Add 30g ammonium persulfate solution (0.1% total monomer mass) dropwise within 1.5h;

[0062] 5) Raise the temperature to 95°C and keep it warm for 2 hours, then cool and discharge to obtain a light yellow viscous substance, which is the anionic polymer emulsifier for liquid AKD;

[0063] 6) Add 50g of liquid AKD, 50g of special anionic polymer emulsifier for liquid AKD and 50g of distilled water into a three-necked flask with stirring;

[0064] 7) Heat up to 35°C;

[0065] 8) Adjust the speed t...

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Abstract

The invention discloses an anionic liquid AKD neutral sizing agent and a preparation method thereof, and relates to the technical field of papermaking sizing. Ethylene, acrylate monomers, acrylamide, and anionic monomers, adjust the pH to be acidic with glacial acetic acid, stir and mix to heat up, evenly add the initiator solution dropwise, react for 2-3 hours, cool and discharge to obtain a liquid AKD special anionic emulsifier ; Step 2, mixing the anionic emulsifier with liquid AKD and water. The anionic liquid AKD neutral sizing agent prepared by the invention is used in combination with the fluorescent whitening agent in high-white cultural paper, which avoids adverse effects on the whiteness of the paper under the premise of ensuring the water resistance effect, and improves the high whiteness. Cultural paper into paper quality.

Description

technical field [0001] The invention relates to the technical field of papermaking sizing, in particular to an anionic liquid AKD neutral sizing agent and a preparation method thereof. Background technique [0002] Brighteners are essential additives in high-whiteness high-grade cultural paper, and most of the optical brighteners used in papermaking are anionic direct dyes. With the development of papermaking technology, cationic chemicals are widely used in papermaking, but all cationic chemicals will have a negative impact on the whitening effect of fluorescent whitening agents. If not handled properly, even a small amount of cationic chemicals will Seriously affect the whiteness of paper. [0003] In order to improve the whiteness of the paper and ensure the water resistance of the paper, an anionic sizing agent must be used. The traditional anionic sizing agent is mainly anionic rosin size, which will not affect the whiteness of paper when used together with fluorescen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F212/14C08F212/08C08F220/18C08F220/06C08F222/02C08F228/02C08F220/58D21H21/16
CPCD21H21/16C08F220/56C08F220/585C08F212/08C08F220/1804C08F220/1818C08F212/14C08F220/1802C08F220/1808C08F220/06C08F222/06C08F228/02C08F220/1811
Inventor 王松林孙成进姜澎涛邢仁卫
Owner QINGDAO UNIV OF SCI & TECH