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A kind of polymeric dispersant and environment-friendly surface sizing agent prepared by adopting the dispersant

A technology of polymerizing dispersant and surface sizing agent, applied in the direction of adding water repellent, can solve problems such as residue and multi-VOC, and achieve the effect of good water resistance, low Cobb value and good dispersibility

Active Publication Date: 2022-07-26
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, a kind of sizing agent disclosed by CN106223116B has improved the Cobb value of paper, but the synthetic product has more VOC residues

Method used

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  • A kind of polymeric dispersant and environment-friendly surface sizing agent prepared by adopting the dispersant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of polymeric dispersant:

[0032] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer and a thermometer, add 100 grams of maleic anhydride and 600 grams of polyvinyl alcohol, heat and melt, and react at 80° C. for 3 hours. The temperature was lowered to 40° C., 120 g of chlorosulfonic acid was added, and the reaction was continued for 1 hr.

[0033] 2. Preparation of environmentally friendly surface sizing agent:

[0034] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer and a thermometer, add 10g of polymeric dispersant, 500g of deionized water, 4g of acetic acid and then heat up to 80°C, and add 1g of ammonium persulfate. After 10 min of reaction, 180 g of mixed monomers (100 g of styrene, 80 g of ethyl acrylate) were slowly added dropwise, and the dropwise addition was completed in 1.5 hr. 0.5 g of ammonium persulfate was added to continue the reaction for 1 hr. After cooling, it was filtered throu...

Embodiment 2

[0036] 1. Preparation of polymeric dispersant:

[0037] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer and a thermometer, add 100 grams of maleic anhydride and 650 grams of polyvinyl alcohol, heat to dissolve, and react at 90° C. for 3 hours. The temperature was lowered to 50° C., 125 g of chlorosulfonic acid was added, and the reaction was continued for 1.5 hr.

[0038] 2. Preparation of environmentally friendly surface sizing agent:

[0039] In a 1000ml four-necked flask with a condenser, a dropping device, a stirrer, and a thermometer, add 20 grams of polymeric dispersant, 600 grams of deionized water, 4 grams of acetic acid, and then raise the temperature to 90°C, and add 1 grams of potassium persulfate. After 10 min of reaction, 200 g of mixed monomers (100 g of styrene, 100 g of n-butyl acrylate) were slowly added dropwise, and the dropwise addition was completed in 2.0 hr. 0.5 g of potassium persulfate was added to continue the reaction f...

Embodiment 3

[0041] 1. Preparation of polymeric dispersant:

[0042] In a 1000ml four-necked flask equipped with a condenser, a dropping device, a stirrer and a thermometer, add 100 grams of maleic anhydride and 700 grams of polyvinyl alcohol, heat to dissolve, and react at 95°C for 3 hours. The temperature was lowered to 50° C., 130 g of chlorosulfonic acid was added, and the reaction was continued for 2.5 hr.

[0043] 2. Preparation of environmentally friendly surface sizing agent:

[0044] In a 1000ml four-necked flask with a condenser, a dripping device, a stirrer and a thermometer, add 35g of polymeric dispersant, 530g of deionized water, 4g of acetic acid and then heat up to 90°C, add 3g of dibenzoyl peroxide . After 15 min of reaction, 160 g of mixed monomers (100 g of styrene, 60 g of isooctyl acrylate) were slowly added dropwise, and the dropwise addition was completed in 2.0 hr. 1.0 g of potassium persulfate was added to continue the reaction for 1 hr. After cooling, it was f...

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Abstract

The invention discloses a polymeric dispersant. The preparation method comprises the following steps: mixing maleic anhydride and polyvinyl alcohol, heating to melting, and then performing a polycondensation reaction; after the reaction is completed, the temperature is lowered, and chlorosulfonic acid is added to obtain the reaction after the reaction is completed. the polymeric dispersant. The invention also discloses an environment-friendly surface sizing agent, the preparation method of which includes the following steps: mixing the above-mentioned polymeric dispersant, acetic acid and water, then adding an initiator to react; continuing to dropwise add (methyl)styrene, (methyl) base) acrylate monomer, and the surface sizing agent is obtained after sufficient reaction. The environment-friendly surface sizing agent of the invention is a high-performance and environment-friendly product that can meet the requirements of paper surface sizing. The product, together with starch, is used to surface sizing the base paper, which can significantly improve the water resistance of the paper. At the same time, the polymerized dispersant has good emulsifying performance, so the residual monomer of the synthesized emulsion is low.

Description

technical field [0001] The invention relates to the field of preparation of surface sizing agents, in particular to a paper surface sizing agent with strong water resistance and environmental protection. Background technique [0002] The addition of surface sizing agents can improve the properties of paper sheets or increase the surface properties, strength and water resistance of paper or paperboard. [0003] Surface sizing agents are of great significance to the development of the paper industry. Papermakers also hope to improve paper performance and product grades through surface sizing to meet the current needs of the continuous development of papermaking, printing and related fields. The performance of surface sizing agent products directly affects the effect of surface sizing. As a new product emerging in recent years, polymer surface sizing agent has developed rapidly in the paper industry due to its unique properties. It can meet the production needs of various pape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/16C08F8/38C08F8/46C08F290/12C08F212/08C08F220/18C08F2/26
CPCD21H21/16C08F2/26C08F8/38C08F290/12C08F8/46C08F116/06C08F220/1808C08F220/1804C08F220/1802
Inventor 施晓旦谢中怡尹东华金霞朝
Owner SHANGHAI DONGSHENG NEW MATERIALS
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