Method for preparing core-shell soap-free surface sizing agent

A surface sizing agent and core-shell technology, which is applied in the field of preparation of core-shell soap-free surface sizing agents, can solve problems such as difficulty in wide-scale promotion, expensive PUD raw materials, and adverse effects on sizing performance. Achieve the effect of excellent sizing performance, simple preparation method and low cost

Inactive Publication Date: 2008-06-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PUD raw materials are expensive, the production process is complicated, and there are many factors affecting its application, making it difficult to promote it on a large scale.
SAE uses small molecule surfactants as emulsifiers or adds a small amount of organic solvents to participate in the polymerization reaction, which has a significant adverse effect on the sizing performance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add deionized water, 5 parts (by mass) sodium polyacrylate (viscosity-average relative molecular weight 5600) and 4 parts of vinyl to the reaction device with speed-adjustable stirrer, temperature controller and condensing reflux device Sodium sulfonate, stir well until the system is uniform.

[0026] (2) In the above solution, add the mixture of all acrylate soft monomers, hard monomers and ionic monomers in turn under stirring (42 parts of styrene, 8 parts of methyl methacrylate, 47 parts of butyl acrylate Esters, 1 part of maleic anhydride and 2 parts of acrylic acid, 0.5 parts of tert-dodecyl mercaptan) part of the mixture with a total mass of 20%, heating the system, raising the temperature to 75 ° C, and then adding the entire ammonium persulfate solution (by 1 Dissolve 19 parts of ammonium persulfate into 19 parts of deionized water) a partial solution of 30% of the total mass, after 20 minutes of seeding, then heat up to 78°C.

[0027] (3) In the above-ment...

Embodiment 2

[0030] (1) Add deionized water, 7 parts by mass of sodium polyacrylate (viscosity-average relative molecular weight 6200) and 3 parts of vinylsulfonic acid Sodium, stir well until the system is uniform.

[0031] (2) In the above solution, add the mixture of all acrylate soft monomers, hard monomers and ionic monomers in turn under stirring (39 parts of styrene, 50 parts of butyl acrylate, 8 parts of methyl methacrylate ester, 0.2 parts of tert-dodecyl mercaptan, 1 part of maleic anhydride and 2 parts of acrylic acid) part of the mixture of 20% of the total amount, heating the system, raising the temperature to 75 ° C, and then adding the total ammonium persulfate solution (by 1 Dissolve 19 parts of ammonium persulfate into 19 parts of deionized water) part solution of 30% of total amount, after 20 minutes, be warming up to 78 ℃ again.

[0032] (3) In the above-mentioned reaction system, add dropwise the mixture of remaining 80% acrylate soft monomer, hard monomer and ionic mo...

Embodiment 3

[0035] (1) Add deionized water, 3 parts by mass of sodium polyacrylate (viscosity-average relative molecular weight 5600) and 4 parts of vinylsulfonic acid Sodium, stir well until the system is uniform.

[0036] (2) In the above solution, add the mixture of all acrylate soft monomers, hard monomers and ionic monomers sequentially under stirring (42 parts of styrene, 47 parts of butyl acrylate, 8 parts of methyl methacrylate ester, 0.5 parts of tert-dodecyl mercaptan, 1 part of maleic anhydride and 4 parts of acrylic acid) part of the mixture of 20% of the total amount, heating the system, raising the temperature to 75 ° C, and then adding the total ammonium persulfate solution (by 1 Dissolve 19 parts of ammonium persulfate into 19 parts of deionized water) part solution of 30% of total amount, after 20 minutes, be warming up to 78 ℃ again.

[0037] (3) In the above-mentioned reaction system, add dropwise the mixture of remaining 80% acrylate soft monomer, hard monomer and ion...

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PUM

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Abstract

The invention discloses a preparation method of nucleocapsid soap free surface sizing agent and comprises the following procedures that: (1) firstly, water, macromolecule polymers and monomers are mixed according to the mass ratio of 8.5:1.5 to 6.5:3.5, then proper molecular weight regulator are added and uniformly stirred; the monomers comprise a function monomer, an acrylate kind soft monomer, a hard monomer and an ion monomer; (2) in a stirring state, a part of mixture which accounts for 10 percent to 60 percent of the total mixture mass of the acrylate kind soft monomer, the hard monomer and the ion monomer is added and heated to 73 to 75 DEG C; evocating agent solution which accounts for 20 percent to 50 percent of the total evocating agent mass is then added; after 20 to 60 minutes, the mixture is heated to 76 to 82 DEG C; (3) then the residual mixture of the acrylate kind soft monomer, the hard monomer and the ion monomer and the residual evocating agent solution are respectively added; (4) the mixture is heated to 80 to 82 DEG C for heat preservation, has reaction for 2h to 3h, cooled to the room temperature and filtered, thereby achieving the nucleocapsid soap free surface sizing agent.

Description

technical field [0001] The invention relates to the field of papermaking surface treatment aids, in particular to a preparation method of a core-shell soap-free surface sizing agent. Background technique [0002] Surface sizing is an important part of the paper industry. Surface sizing can improve the performance of paper products, reduce production costs, and reduce environmental pollution in the papermaking process. The performance of surface sizing agents directly affects the effect of surface sizing. At present, surface sizing agents mainly include two categories: natural polymer surface sizing agents and synthetic polymer surface sizing agents. Among them, synthetic polymer surface sizing agents As a new product that has appeared in recent years, it has developed rapidly with its unique advantages. It can endow paper with many excellent properties and meet the production needs of various paper products, especially providing a strong support for the development of high-g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
Inventor 詹怀宇李建文付时雨
Owner SOUTH CHINA UNIV OF TECH
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