Preparation method of graft copolymer for surface sizing

A technique of graft copolymer and surface sizing, which is applied in the direction of water-repellent addition, paper, textiles and papermaking, etc., which can solve the problems of low grafting rate and poor overall performance, and achieve good storage stability and improved Paper tensile strength and tear resistance, effect of small particle size

Active Publication Date: 2011-07-20
JIANGSU FEYMER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3) The grafting rate is low, and the overall performa

Method used

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  • Preparation method of graft copolymer for surface sizing
  • Preparation method of graft copolymer for surface sizing
  • Preparation method of graft copolymer for surface sizing

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] The preparation of the modified starch aqueous solution: in the reactor equipped with stirring, add 7000kg of water, turn on stirring, slowly drop into 2000kg oxidized starch and 1kg α-amylase, be warming up to 70 ℃ constant temperature 30min, then be warming up to 95 ℃, cooling again to below 85°C.

Example Embodiment

[0034] Example 2

[0035] Preparation of Mixed Monomer A: Weigh 250kg of styrene, 98kg of butyl acrylate, and 0.4kg of methylstyrene dimer, put them into a reactor equipped with stirring, and mix them evenly; replace with nitrogen to remove air.

[0036] The preparation of mixed monomer B: take by weighing 30kg water, 30kg DMAPMA, 2.5kg MBAM, 20kg PMDQ-14, 4kg acrylamide, put into the reactor with stirring respectively, mix well, add the reactor after diluting with 13kg industrial hydrochloric acid for adjustment pH; displacement with nitrogen to remove air.

[0037] Drop into 850kg modified starch aqueous solution, 0.025kg calcium acetate in the polymerization kettle, replace the polymerization kettle with nitrogen to remove air, be warming up to 90 ℃ under stirring, add 12kg Quab-342, add 132kg of 5% aqueous sodium hydroxide solution in 10min, then keep warm 30min; add 15kg of glacial acetic acid, dissolve 1.2kg of ferrous sulfate with a small amount of water, then add to...

Example Embodiment

[0039] Example 3

[0040]The preparation of mixed monomer A: weigh 250kg of styrene, 30kg of methyl methacrylate, 60kg of butyl acrylate, and 0.4kg of methyl styrene dimer, put into a stirred reactor, mix well, and replace with nitrogen Remove air.

[0041] The preparation of mixed monomer B: take by weighing 30kg water, 20kg DM, 2.5kg MBAM, 15kg DMDQ-14, 4kg acrylamide, drop into the reactor with stirring respectively, mix homogeneously, add the reactor after dilution with 13kg industrial hydrochloric acid for adjustment pH, replace with nitrogen to remove air.

[0042] Put 850kg of modified starch aqueous solution and 0.025kg of calcium acetate into the polymerization kettle, replace the polymerization kettle with nitrogen to remove air, heat up to 85°C under stirring, add 15kg of Quab-426, and add 132kg of 5% sodium hydroxide aqueous solution in 10 min. , and then incubated for 30 min. Add 15 kg of glacial acetic acid. Dissolve 0.8 kg of ferrous sulfate with a small a...

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PUM

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Abstract

The invention discloses a preparation method of a graft copolymer for surface sizing, comprising the following preparation processes of: hydrolyzing starch under enzyme action, then modifying by a cationic etherifying agent to form cationic starch with a certain molecular weight; adding a reducing agent to the water solution of the cationic starch, then dropwise adding an oxidizer initiator, a hard monomer, a soft monomer, a chain transfer agent, a cationic monomer, an emulsifying monomer, a crosslinking monomer and other functional monomers for graft copolymerization; and performing bacteriostasis treatment on the copolymer to obtain the finished product. The surface sizing agent prepared by the preparation method disclosed by the invention has a small particle size, good stability in storage, quick sizing speed and high retention, and can improve the water resistance as well as the tensile strength and tear resistance of paper.

Description

Technical field [0001] The present invention involves a high -connection rate and high -retaining rate of cation surface appliances, and more specifically, it involves a preparation method for the closure of the surface of the surface of the surface. Background technique [0002] During the papermaking process, glue is often used to improve the water resistance, impervices, and other performance of paper. Starch and benzalcopy emulsion are better adhesives.The price of starch is low, but the retaining rate is low, the water resistance is poor, and it is easy to break; the hydraulic resistance is good, and new functions can be achieved by adding functional monomers, but the cost of expensive use is high.The starch closure phenyl polymer can combine the advantages of the two and has good cost performance, which has now become an important development direction for surface gel. [0003] The BASF patent WO2005121195 adopts the process of pre -aggregation and then aggregation, which i...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F212/08C08F220/18C08F220/36C08F2/22C08F2/38C08B31/08D21H17/45D21H21/16
Inventor 李胜兵刘昭清
Owner JIANGSU FEYMER TECH
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