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Surface sizing agent and method for preparing same

A technology of surface sizing agent and initiator, applied in the field of papermaking, can solve the problems of difficult cleaning, high viscosity, no effect of paper wet strength, etc., achieve good surface strength and folding resistance, good emulsifying and dispersing properties, improve bonding The effect of fastness

Active Publication Date: 2008-04-16
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (3) The viscosity of the PVA aqueous solution is relatively large, and a large amount of sizing liquid remains on the pressing roller, and then forms a film on the sizing roller, which is difficult to clean;
[0012] (4) The PVA film formed by hard hydrogen bonds has a high brittleness, which eventually leads to low folding resistance of the paper;
[0013] (5) It has almost no effect on improving the wet strength of paper
But above-mentioned polymer surface sizing agent all uses a large amount of solvent or emulsifying agent in the preparation process, and environment and application effect etc. are produced adverse influence; And these polymer surface sizing agents generally will be mixed with surface sizing starch ( Anionic or non-ionic) used together, the operation is troublesome

Method used

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  • Surface sizing agent and method for preparing same
  • Surface sizing agent and method for preparing same
  • Surface sizing agent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] This example is a soap-free emulsion surface sizing of a polymer having the general formula I, wherein:

[0080] R is -CH 2 (CH 2 ) 6 CH 2 OH, X is Na + , n is 10-1000.

[0081] The surface sizing agent of this embodiment uses polyvinyl alcohol as a dispersant, and four monomers of styrene, acrylate, acrylamide and maleic anhydride as main raw materials. Under the action, the polymer surface sizing agent obtained by soap-free emulsion polymerization; wherein, the weight ratio of dispersant, monomer, initiator and crosslinking agent is:

[0082] Dispersant (polyvinyl alcohol): 50 parts;

[0083] Monomer: Styrene: 12 parts,

[0084] Acrylates: 18 parts,

[0085] Acrylamide: 10 parts,

[0086] Maleic anhydride: 8 parts;

[0087] Initiator (potassium persulfate): 2 parts;

[0088] Crosslinking agent (glyoxal): 15 parts.

[0089] Its preparation method mainly comprises the following steps:

[0090] (1), the preparation of polyvinyl alcohol solution: in the react...

Embodiment 2

[0094] This example is a soap-free emulsion surface sizing of a polymer having the general formula I, wherein:

[0095] R is -CH 2 (CH 2 ) 16 CH 2 OH, X is K + , n is 10-1000.

[0096] The surface sizing agent of this embodiment uses polyvinyl alcohol as a dispersant, and four monomers of styrene, acrylate, acrylamide and maleic anhydride as main raw materials. Under the action, the polymer surface sizing agent obtained by soap-free emulsion polymerization; wherein, the weight ratio of dispersant, monomer, initiator and crosslinking agent is:

[0097] Dispersant (polyvinyl alcohol): 40 parts;

[0098] Monomer: styrene: 20 parts,

[0099] Acrylates: 15 parts,

[0100] Acrylamide: 12 parts,

[0101] Maleic anhydride: 1 part;

[0102] Initiator (ammonium persulfate): 8 parts;

[0103] Crosslinking agent (glyoxal): 10 parts.

[0104] Its preparation method mainly comprises the following steps:

[0105] (1), the preparation of polyvinyl alcohol solution: in the reactio...

Embodiment 3

[0109] This example is a soap-free emulsion surface sizing of a polymer having the general formula I, wherein:

[0110] R is -CH 2 (CH 2 ) 2 CH 2 OH, X is NH 4 + , n is 10-1000.

[0111] The surface sizing agent of this embodiment uses polyvinyl alcohol as a dispersant, and four monomers of styrene, acrylate, acrylamide and maleic anhydride as main raw materials. Under the action, the polymer surface sizing agent obtained by soap-free emulsion polymerization; wherein, the weight ratio of dispersant, monomer, initiator and crosslinking agent is:

[0112] Dispersant (polyvinyl alcohol): 60 parts;

[0113] Monomer: styrene: 9 parts,

[0114] Acrylates: 21 parts,

[0115] Acrylamide: 5 parts,

[0116] Maleic anhydride: 15 parts;

[0117] Initiator (ammonium persulfate): 1 part;

[0118] Crosslinking agent (glutaraldehyde): 20 parts.

[0119] Its preparation method mainly comprises the following steps:

[0120] (1), the preparation of polyvinyl alcohol solution: in th...

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Abstract

The invention discloses a surface sizing agent which is soap-free emulsion of polymers with the following general formula I: (general formula I) wherein, R is selected from a saturated fatty alcohol group with carbon numbers of 1-18; X is selected from any one in Na<+>, K<+>, NH4<+>, etc; n is 10-1000. The sizing agent is a novel synthetic polymer surface sizing agent for paper, so surface sizing capability of paper can be greatly improved, binding fastness of paper and ink can be improved, surface strength of paper can be improved, etc.; besides, the invention also has the advantages that: few crust is provided during using process, cleaning is convenient, folding resistance of finished product is increased, wet strength is high, etc. The invention also discloses a preparation method of the sizing agent.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a synthetic polymer surface sizing agent for papermaking. Background technique [0002] Sizing agents for papermaking refer to chemical additives added to improve the surface strength of paper and cardboard and prevent the diffusion and penetration of water-based liquids (such as writing ink). It is an important papermaking chemical with a large amount and a wide range of applications. [0003] According to the different ways of adding it in the papermaking process, the sizing agent for papermaking can be divided into two categories: (1) the sizing agent added to the pulp before the paper sheet is formed is called the pulp sizing agent; (2) ) is called a surface sizing agent that is applied to the surface of the cardboard after the paper sheet is formed. [0004] Since the sizing agent in the pulp is easily affected by production conditions (such as water quality, pH value,...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/35D21H17/36
Inventor 田德卿沈一丁陈玉群李刚辉费贵强赵锦良
Owner CHINA BANKNOTE PRINTING & MINTING
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