Preparation method for paper nanometer level surface sizing agents capable of realizing fast curing

A surface sizing agent, nano-level technology, applied in the direction of adding water repellent, can solve the problems of aggravating hair loss and powder loss, and reducing the surface strength and smoothness of paper sheets, so as to improve the sizing effect, improve the surface strength, The effect of improving the strength and toughness of the coating

Active Publication Date: 2012-02-15
ZHEJIANG KESIKE CHEM NEW MATERIAL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

At the same time, in order to reduce production costs, paper mills use more non-wood pulp and add more fillers, resulting in a decrease in the surface strength and smoothness of the paper sheet, and exacerbating the phenomenon of lint and powder falling during the printing process.

Method used

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  • Preparation method for paper nanometer level surface sizing agents capable of realizing fast curing

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preparation example Construction

[0048] The preparation method of the paper nano-scale surface sizing agent that can be ripened rapidly comprises the following steps:

[0049] A, raw materials: cationic polymer emulsifier based on 20-60% of total weight; (methyl) styrene monomer based on 2-18% of total weight; (meth)acrylic acid based on 2-18% of total weight Ester monomer; 0-5% internal crosslinking monomer based on total weight; 0.5-5% pH regulator based on total weight; 0-3% molecular weight regulator based on total weight; 0.01-1% based on total weight % reduction initiator; 0.1-5% oxidation initiator based on total weight; 10-80% water based on total weight; optimal weight of water is 30-73% based on total weight.

[0050] B. Preparation:

[0051] ① Mix (methyl) styrene monomer, (meth) acrylate monomer, molecular weight regulator and internal crosslinking monomer evenly to form a mixed monomer; ② Mix cationic polymer emulsifier, water, Mix the pH adjuster, molecular weight adjuster and reduction initiato...

Embodiment 1

[0058] Add 40g of styrene, 10g of butyl acrylate, 30g of dimethylaminoethyl methacrylate, 80g of isopropanol and 120g of water into a 500ml four-necked flask equipped with a condenser, a stirrer and a thermometer. Stir, raise the temperature to 70°C, slowly add 20g of 5wt% ammonium persulfate aqueous solution dropwise, and finish adding in about 30 minutes. After the dropwise addition was completed, the temperature was gradually raised to 85° C., and the reaction was carried out for 4 hours. Then, cool to 45°C, add 8g of epichlorohydrin, keep the temperature constant, and react for 40min. During the reaction, the viscosity will increase. Then, quickly add 10g of concentrated hydrochloric acid and 80g of water, and continue stirring for 10min. Cool and discharge to obtain a cationic polymer emulsifier with a solid content of 20% and a pH of 3.43.

[0059] In a 500ml four-neck flask equipped with a condenser, dropping device, stirrer and thermometer, add 120g cationic polymer...

Embodiment 2

[0061] In the present embodiment, in the 500ml four-necked flask that has condenser, dropping device, agitator and thermometer, add 160g cationic polymer emulsifier, 10g styrene, 3g tert-butyl acrylate, 4.5g glacial acetic acid, 0.05g sodium bisulfite, 0.1g dodecanethiol and 106g water. Stir, heat up to 70°C, add 4g of 5wt% sodium persulfate solution, and stir for 10 minutes. Then, at this temperature, the monomer mixture (30g styrene, 37g ethyl acrylate) and 16g 5wt% sodium persulfate solution were added dropwise at the same time, and the dropping time was controlled at about 1.5h. Then, the temperature was raised to 80° C., and the reaction was carried out for 3 h. After cooling and discharging, the paper nano-scale surface sizing agent that can be rapidly matured is obtained, the solid content is 30%, and the pH is 3.43. The rest are similar to the implementation example 1, and will not be repeated.

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Abstract

The invention relates to a paper surface sizing agent, in particular to a preparation method for paper nanometer level surface sizing agents capable of improving the paper water resistance, surface intensity and annular pressure intensity and realizing the fast curing, which belongs to the technical field of chemical engineering and solves the technical problems of poor product quality and the like in the prior art. The surface sizing agent is prepared by the method of firstly preparing cation type polymer emulsifying agents and then preparing nanometer styrene-acrylates microemulsion. The method has the advantages that the defect of strong self water absorption performance of small molecular emulsifying agents is overcome, and in addition, the effective contact area between the surface sizing agent and the paper surface fiber is greatly improved, so the curing speed after the paper surface sizing and the sizing effect can be respectively and obviously accelerated and improved. The characteristic that paper making wet reinforcing agents of polyamide propylene oxide chloride resin can be fast combined with the fiber, and the cation type polymer emulsifying agents are adopted for taking reaction with epoxy chloropropane to obtain cation charges, so the fast combination of products with the paper surface fiber in the sizing process is promoted, and the curing speed is accelerated.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a paper surface sizing agent, in particular to a preparation method of a paper nano-scale surface sizing agent capable of improving the water resistance, surface strength and ring pressure strength of paper which can be cured rapidly. Background technique [0002] In recent years, the production scale of the domestic paper industry has continued to expand, the demand for high-grade paper and cardboard has continued to increase, and the printing speed has also become faster and faster. come higher. At the same time, in order to reduce production costs, paper mills use more non-wood pulp and add more fillers, resulting in a decrease in the surface strength and smoothness of the paper sheet, and exacerbating the phenomenon of lint and powder falling during the printing process. These have greatly promoted the application and research of surface sizing, especially surface siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/18C08F220/34C08F220/28C08F2/28C08F4/40D21H21/16
Inventor 尹传猛
Owner ZHEJIANG KESIKE CHEM NEW MATERIAL CO LTD
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