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Lignin surface sizing agent and preparation method thereof

A surface sizing agent and lignin technology, applied in the direction of adding water repellent, can solve the problems of difficult to improve grade, large amount of sizing agent, poor paper strength, etc., to speed up the aging speed and improve the surface ring pressure strength. , Improve the effect of Cobb value

Inactive Publication Date: 2019-11-22
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] However, although the current surface sizing agent can improve the ring compressive strength of corrugated paper, the amount of sizing agent is large and the cost is high.
[0008] A kind of sizing agent disclosed in Chinese patent CN107034730A, although the drying speed is fast, the ring compression strength for corrugated paper is not greatly improved

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

[0032] A) Mix 20 grams of styrene and 20 grams of n-butyl acrylate evenly and set aside.

[0033] B) Dissolve 0.3 gram of ammonium persulfate in 10 grams of deionized water and set aside.

[0034] C) in the four-necked flask with condenser, dropping device, stirrer, thermometer, add 143.3 grams of deionized water, 10 grams of potassium hydroxide, 1 gram of trimethylamine, 100 grams of lignin, be warmed up to after completely dissolving At 45°C, 1 gram of epichlorohydrin was added dropwise for 0.25 hours. Continue to keep warm for 0.75 hours. The temperature was raised to 70°C, and 1 g of hydrochloric acid was added. Add the mixed monomer in step A) dropwise at 70°C for 1 hour; add the aqueous initiator solution in step B) dropwise for 1 hour at the same time, continue to keep warm at 70°C for 1 hour after the dropwise addition, and cool To 25°C, pH=6.23. After filtering through a 100-mesh filter screen, the obtained lignin surface sizing agent had a solid content of 49.92 ...

Embodiment 2

[0036] A) Mix 100 grams of methyl styrene, 100 grams of isooctyl acrylate, and 100 grams of hydroxypropyl acrylate, and set aside.

[0037] B) Dissolve 10 grams of sodium persulfate in 100 grams of deionized water and set aside.

[0038] C) in the four-necked flask with condenser, dropping device, stirrer, thermometer, add 2960 grams of deionized water, 40 grams of ammonium hydroxide, 25 grams of trimethylamine, 100 grams of lignin, be warmed up to after dissolving completely At 55°C, 25 g of epichlorohydrin was added dropwise for 1 hour. Continue to keep warm for 2 hours. The temperature was raised to 95°C, and 40 grams of sulfuric acid was added. Add the mixed monomer in step A) dropwise at 95°C for 3 hours; add the aqueous initiator solution in step B) dropwise for 3 hours at the same time, continue to keep warm at 95°C for 2 hours after the dropwise addition, and cool To 25°C, pH=1.18. Filter through a 100-mesh filter to obtain a lignin surface sizing agent with a soli...

Embodiment 3

[0040] A) Mix 60 grams of methyl styrene, 50 grams of ethyl methacrylate, and 50 grams of glycidyl methacrylate, and set aside.

[0041] B) Dissolve 6 grams of hydrogen peroxide in 100 grams of deionized water, set aside.

[0042] C) in the four-necked flask with condenser, dropping device, stirrer, thermometer, add 684 grams of deionized water, 20 grams of sodium hydroxide, 15 grams of trimethylamine, 100 grams of lignin, be warmed up to after dissolving completely At 65°C, 15 g of epichlorohydrin was added dropwise for 2 hours. Continue to keep warm for 1 hour. The temperature was raised to 85°C, and 20 grams of acetic acid was added. Add the mixed monomer in step A) dropwise at 85°C for 1.5 hours; add the aqueous initiator solution in step B) dropwise for 2 hours. To 25°C, pH=4.54. After filtering through a 100-mesh filter screen, the obtained lignin surface sizing agent has a solid content of 29.68 wt%.

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Abstract

The invention discloses a lignin surface sizing agent. The lignin surface sizing agent is an aqueous dispersion formed by copolymerizing lignin, an alkali, trimethylamine, epoxy chloropropane, an acid, a crosslinking monomer, a (meth)acrylate monomer, (methyl)styrene and an initiator. The lignin surface sizing agent disclosed by the invention is a high-performance and environment-friendly productcapable of meeting paper surface sizing. The product and starch are used together for surface sizing of corrugated base paper, the Cobb value of corrugated paper can be improved, the curing speed canbe increased, the surface ring crush compression strength of the corrugated paper can be greatly improved, and the requirement for development of high-strength corrugated paper can be met. Meanwhile,the surface sizing agent can use the lignin generated in a papermaking process as an initial raw material, so that the production cost is remarkably reduced.

Description

technical field [0001] The invention relates to the field of papermaking surface sizing agents, in particular to a lignin surface sizing agent and a preparation method thereof. Background technique [0002] The development trend of paper, especially corrugated paper and cardboard is as follows: [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 unstable quality of paper caused by many variable factors in internal sizing, and the difficulty of improving the grade, it has become a popular trend for manufacturers to use less or abandon internal sizing and use surface sizing to make up for it. The addition of surface sizing agent can improve the properties of paper sheets or increase the surface properties, strength and water resistance of paper or paperboard. [0006] Requirements for the sizing agent used for th...

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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