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Lignin surface sizing agent and preparation method thereof

A technology of surface sizing agent and lignin, which is applied in the preparation of lignin surface sizing agent and the field of lignin surface sizing agent, can solve the problems of high cost, large amount of sizing agent, and difficulty in improving grades, etc. Achieve the effect of being suitable for large-scale industrial production, improving the surface ring crush strength, and improving the Cobb value

Inactive Publication Date: 2018-10-12
SHANGHAI CHANGFA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2) Use waste paper instead of wood pulp, but the strength of the paper is poor and the water absorption value is high;
[0005] 3) Due to the many variable factors of internal sizing, the paper quality is unstable and the grade is difficult to improve, which makes manufacturers use less or give up internal sizing and use surface sizing to make up for it has become a popular trend
[0007] Although the existing surface sizing agents on the market can improve the ring compressive strength of corrugated paper to a certain extent, however, the amount of sizing agents is too large, resulting in high costs
For example, the Chinese patent application CN107034730A in the prior art discloses a moisture-proof and quick-drying surface sizing agent, which has a very fast drying speed, but it does not improve the ring compressive strength of corrugated paper much.

Method used

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  • Lignin surface sizing agent and preparation method thereof
  • Lignin surface sizing agent and preparation method thereof
  • Lignin surface sizing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare lignin surface sizing agent ① according to the following steps:

[0034] Step A): Mix 20 grams of styrene, 20 grams of n-butyl acrylate, and 5 grams of N,N-dimethylaminoethyl acrylate, and set aside;

[0035] Step B): Dissolve 0.3 g of ammonium persulfate in 10 g of deionized water for use;

[0036] Step C): Add 148.3 grams of deionized water, 10 grams of potassium hydroxide, 1 gram of trimethylamine, and 100 grams of lignin into a four-necked flask equipped with a condenser, a dripping device, a stirrer and a thermometer. After it is completely dissolved Increase the temperature to 45°C, add 1 gram of epichlorohydrin dropwise, the dropping time is 0.25 hours, and the temperature is continued for 0.75 hours; the temperature is increased to 70°C, and 1 gram of hydrochloric acid is added; The dripping time is 1 hour; at the same time, the initiator aqueous solution prepared in step B) is dripped, and the dripping time is 1 hour; after the dripping, the reaction is kept ...

Embodiment 2

[0038] Prepare lignin surface sizing agent ② according to the following steps:

[0039] Step A): Mix 100 grams of methyl styrene, 100 grams of isooctyl acrylate, and 100 grams of methacrylamide propyl dimethyl amine, and set aside;

[0040] Step B): Dissolve 10 grams of sodium persulfate in 100 grams of deionized water for use;

[0041] Step C): Add 2960 grams of deionized water, 40 grams of ammonium hydroxide, 25 grams of trimethylamine, and 100 grams of lignin in a four-necked flask equipped with a condenser, a dripping device, a stirrer, and a thermometer. Warm up to 55°C, add 25 grams of epichlorohydrin dropwise, dropwise for 1 hour, continue to keep for 2 hours; warm up to 95°C, add 40 grams of dilute sulfuric acid; add dropwise the mixed monomer prepared in step A) at 95°C , The dripping time is 3 hours; the initiator aqueous solution prepared in step B) is dripped at the same time, the dripping time is 3 hours; after the dripping, the reaction is kept at 95°C for 2 hours, and...

Embodiment 3

[0043] Prepare lignin surface sizing agent ③ according to the following steps:

[0044] Step A): Mix 60 grams of methyl styrene, 50 grams of ethyl methacrylate, and 50 grams of methacrylamide propyl dimethyl amine, and set aside;

[0045] Step B): Dissolve 6 grams of hydrogen peroxide in 100 grams of deionized water for use;

[0046] Step C): Add 684 grams of deionized water, 20 grams of sodium hydroxide, 15 grams of trimethylamine, and 100 grams of lignin into a four-necked flask equipped with a condenser, a dripping device, a stirrer and a thermometer. Raise the temperature to 65°C, add 15 grams of epichlorohydrin dropwise, add dropwise for 2 hours, and continue to keep the temperature for 1 hour; raise the temperature to 85°C, add 20 grams of acetic acid; add dropwise the mixed monomer prepared in step A) at 85°C, The dripping time is 1.5 hours; the initiator aqueous solution prepared in step B) is dripped at the same time, and the dripping time is 2 hours; after the dripping is ...

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Abstract

The invention provides a lignin surface sizing agent, and a preparation method of the lignin surface sizing agent. The lignin surface sizing agent is a water dispersion by copolymerizing lignin, alkali, trimethylamine, chloropropylene oxide, acid, a cation monomer, a (methyl)acrylic ester monomer, (methyl)styrene, and an initiator. The lignin surface sizing agent is suitable for surface treatmentof corrugated medium. The product and starch realize surface sizing on the corrugated medium, a Cobb value of the corrugated paper can be improved, the slaking speed is accelerated, the surface ring crush strength of the corrugated paper is greatly increased, the development requirement of the high strength corrugated paper can be adapted, in addition, during the preparation method of the lignin surface sizing agent, the lignin generated during a papermaking process is used as an initial raw material, the cost is low, the operation step is simple, and the preparation method of the lignin surface sizing agent is suitable for large-scale industrial production.

Description

Technical field [0001] The invention relates to the field of papermaking chemicals manufacturing, in particular to a lignin surface sizing agent and a preparation method of the lignin surface sizing agent. Background technique [0002] At present, the development trend of paper, especially corrugated paper and board paper, is reflected in the following aspects: [0003] 1) It is developing from high weight to low weight; [0004] 2) Using waste paper instead of wood pulp, but the strength of the finished paper is poor and the water absorption value is high; [0005] 3) Due to the variable factors of internal sizing, the paper quality is unstable and the grade is difficult to improve. This makes manufacturers use less or abandon internal sizing, and the process of using surface sizing to compensate has become a popular trend. [0006] In addition, the sizing agent used for the above-mentioned surface sizing generally needs to meet the following requirements: a) increase the ring pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21H19/14D21H19/20C08F289/00C08F212/08C08F220/18
CPCC08F289/00D21H19/14D21H19/20D21H21/16C08F220/1804
Inventor 施晓旦尹东华金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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