Surface sizing agent and preparation method thereof, sizing solution and sizing paper

A technology of surface sizing agent and sizing liquid, applied in the field of sizing paper, can solve the problems of polluted environment, low solid content, poor dispersibility, etc., and achieve the effect of good use effect, high performance, and improved waterproofness

Active Publication Date: 2016-12-21
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polymer-based surface sizing agents still have the following disadvantages: solution-type polymers are more uniformly mixed with starch, but generally have low solid content; although emulsion-type polymers have relatively high solid content, their dispersibility is relatively poor; commonly used Although the film-forming properties of SMA and SAA are relatively good, they are prone to foaming during surface sizing, which has a negative impact on the strength of the sized paper. Moreover, organic solvents are used as reaction media in the polymerization process, polluting environment, endangering human health; although SAE and PUD are not prone to foaming during surface sizing, they have put forward higher standards for the sizing of the pulp before the sizing paper is formed, which is not conducive to fundamentally reducing the pulp Negative problems caused by internal sizing

Method used

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  • Surface sizing agent and preparation method thereof, sizing solution and sizing paper
  • Surface sizing agent and preparation method thereof, sizing solution and sizing paper
  • Surface sizing agent and preparation method thereof, sizing solution and sizing paper

Examples

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preparation example Construction

[0016] The preparation method of this surface sizing agent, it comprises the steps:

[0017] (1) Prepare cationic starch solution.

[0018] The mass percent concentration of the cationic starch solution is 30%-40%, and the pH value is 4-6. The cationic starch is prepared by reacting raw starch with cationic etherification agent. The cationic starch liquid is made by using raw starch, or directly mixed with purchased cationic starch and water.

[0019] (2) Add monomer solution and initiator solution to the above-mentioned cationic starch liquid to carry out polymerization reaction to prepare copolymer emulsion of cationic starch grafted monomer.

[0020] The polymerization reaction is under a nitrogen atmosphere, because there is a large amount of oxygen under the air, which will reduce the efficiency of the initiator and even produce unnecessary by-products.

[0021] During the polymerization reaction, the temperature of the mixed solution system is kept at 30-65° C., and t...

Embodiment 1-5

[0049] Examples 1-5 were respectively prepared according to the methods described below to prepare 5 groups of surface sizing agents, and the specific process parameters are shown in Table 1.

[0050] A certain amount of raw starch is added into water to disperse under stirring state to obtain starch milk, and the medium-temperature α-amylase added to the starch milk reacts at a certain temperature for a certain period of time. Add a cationic etherification agent pre-activated by a 30% alkaline catalyst to the above starch liquid, maintain a certain temperature for etherification reaction, and then add glacial acetic acid to adjust the pH to obtain a cationized starch liquid. The monomer-containing solution and the initiator solution are simultaneously but separately metered into the cationic etherified starch solution at a constant feeding rate to carry out polymerization reaction, and the polymerization reaction is carried out under nitrogen atmosphere. 10 minutes after the ...

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Abstract

The invention relates to a surface sizing agent, which contains a polymer of cationic starch grafted monomers and succinylated chitosan sodium, wherein the cationic starch grafted monomers comprise three monomers such as a hard monomer, a soft monomer and a cross-linking monomer, the hard monomer is a mixture comprising one or a plurality of materials selected from styrene, methyl styrene, methyl methacrylate and methyl acrylate, the soft monomer is a mixture comprising one or a plurality of materials selected from n-butyl acrylate, tert-butyl acrylate and octadecyl acrylate, and the cross-linking monomer is a mixture comprising one or two materials selected from 2-hydroxyethyl acrylate and methylol acrylamide. The present invention further provides a preparation method for the surface sizing agent, a sizing liquid containing the surface sizing agent, and sizing paper prepared by applying the sizing liquid containing the surface sizing agent to carry out sizing. The surface sizing agent has characteristics of low price, green environmental protection and good use effect.

Description

technical field [0001] The invention relates to a surface sizing agent used in the field of papermaking and a preparation method thereof, a sizing liquid containing the above-mentioned surface sizing agent, and a sized paper prepared by sizing the sizing liquid containing the above-mentioned surface sizing agent . Background technique [0002] Surface sizing agents used in the paper industry are broadly classified into hydrophilic conventional surface sizing agents and polymer-based surface sizing agents with an amphiphilic structure. There are many types of traditional surface sizing agents, including starch and starch modified products, carboxymethyl cellulose (CMC) and other semi-synthetic polymer substances, in addition to polyvinyl alcohol (PVA), polyacrylamide (PAM ) and other polymer substances with synthetic properties. Polymer surface sizing agents include styrene-maleic anhydride copolymer (SMA), styrene-acrylic acid copolymer aqueous solution (SAA), styrene-acry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16C08F251/00C08B31/12
Inventor 王仁荣张明王春雁李俊
Owner GOLD EAST PAPER JIANGSU
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