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Lignin sizing agent and method for preparing same

A technology of lignin and sizing agent, which is applied in the direction of water-repellent addition, etc., can solve the problems of high cost, large amount of sizing agent, and difficult to improve the grade, so as to be suitable for large-scale industrial production and improve the surface environment. Compressive strength, effect of improving Cobb value

Inactive Publication Date: 2018-09-14
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, Chinese patent application CN107034730 A 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 sizing agent and method for preparing same
  • Lignin sizing agent and method for preparing same
  • Lignin sizing agent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0034] Step A): Mix 20 grams of styrene, 20 grams of n-butyl acrylate, and 1 gram of N,N-dimethylaminoethyl acrylate, and set aside;

[0035] Step B): dissolving 0.3 gram of ammonium persulfate in 10 gram of deionized water, set aside;

[0036] Step C): Add 147.3 grams of deionized water, 10 grams of potassium hydroxide, and 100 grams of lignin into a four-necked flask with a condenser, a dropping device, a stirrer, and a thermometer, and heat up to 45° C. after completely dissolving. Add 5 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride dropwise, dropwise for 0.25 hours, continue to keep warm for 0.75 hours; heat up to 70°C, add 1g of hydrochloric acid; dropwise add step A) preparation at 70°C The obtained mixed monomer was added dropwise for 1 hour; at the same time, the aqueous initiator solution prepared in step B) was added dropwise for 1 hour; after the dropwise addition, the reaction w...

Embodiment 2

[0038] The lignin sizing agent was prepared according to the following steps ②:

[0039] Step A): Mix 100 grams of methyl styrene, 100 grams of isooctyl acrylate, and 100 grams of methacrylamidopropyl dimethylamine, and set aside;

[0040] Step B): Dissolving 10 grams of sodium persulfate in 100 grams of deionized water, set aside;

[0041] Step C): Add 2790 grams of deionized water, 40 grams of ammonium hydroxide, and 100 grams of lignin into a four-necked flask with a condenser, a dropping device, a stirrer, and a thermometer, and heat up to 55°C after completely dissolving. Add 40 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride dropwise, dropwise for 1 hour, continue to keep warm for 2 hours; heat up to 95°C, add 20g of dilute sulfuric acid; drop step A) at 95°C The prepared mixed monomer was added dropwise for 3 hours; at the same time, the aqueous initiator solution prepared in step B) was added dropwise for 3 hours; after the dropwise addition, the reaction ...

Embodiment 3

[0043] The lignin sizing agent was prepared according to the following steps ③:

[0044] Step A): Mix 60 grams of methyl styrene, 50 grams of ethyl methacrylate, and 50 grams of methacrylamidopropyl dimethylamine, and set aside;

[0045] Step B): dissolving 6 grams of hydrogen peroxide in 100 grams of deionized water, set aside;

[0046]Step C): Add 637.3 grams of deionized water, 20 grams of sodium hydroxide, and 100 grams of lignin into a four-necked flask with a condenser, a dropping device, a stirrer, and a thermometer, and heat up to 65° C. after completely dissolving. Add 20 grams of 3-chloro-2-hydroxypropyltrimethylammonium chloride dropwise, dropwise for 2 hours, and continue to keep warm for 1 hour; heat up to 85°C, add 10g of acetic acid; dropwise add step A) preparation at 85°C The obtained mixed monomer was added dropwise for 1.5 hours; at the same time, the aqueous initiator solution prepared in step B) was added dropwise for 1.5 hours; after the dropwise additio...

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Abstract

The invention provides a lignin sizing agent and a method for preparing the same. The lignin sizing agent is an aqueous dispersion. Lignin, alkali, 3-chlorine-2-hydroxypropyl trimethyl ammonium chloride, acid, cationic monomers, (methyl) acrylate monomers, (methyl) styrene and initiators are copolymerized to obtain the aqueous dispersion. The lignin sizing agent and the method have the advantagesthat the lignin sizing agent is a paper surface sizing high-performance environment-friendly product; surface sizing can be carried out on corrugated body paper by the aid of the product and starch, accordingly, Cobb values of corrugated paper can be improved, the aging speeds can be increased, the surface ring crush compression resistance of the corrugated paper can be greatly improved, and the lignin sizing agent and the method can adapt to high-strength corrugated paper development requirements; the lignin generated in papermaking procedures is used as a starting material, and accordingly the method for preparing the lignin sizing agent is low in cost and suitable for large-scale industrial production and includes simple operation steps.

Description

technical field [0001] The invention relates to the field of papermaking chemicals, in particular to a lignin sizing agent and a preparation method of the lignin sizing agent. Background technique [0002] At present, the development trend of paper, especially corrugated paper and cardboard is manifested in the following aspects: [0003] 1) It is developing from high grammage to low grammage; [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. It has become a popular trend for manufacturers to use less or give up internal sizing and use surface sizing to make up for it. [0006] In addition, the sizing agent used for the above-mentioned surface sizing generally needs to meet the following requirements: a) increase the ring compressive strength; b) greatly reduce the...

Claims

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Application Information

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IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 施晓旦尹东华金霞朝
Owner SHANGHAI CHANGFA NEW MATERIAL CO LTD
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