Efficient surface sizing agent for paper and preparation method and application of efficient surface sizing agent

A surface sizing agent, high-efficiency technology, applied in the direction of water-repellent addition, etc., can solve the problems of powder falling off, etc., and achieve the effect of improving smoothness, anti-moisture ability, and good water resistance

Active Publication Date: 2019-11-12
广东诚铭化学品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural polymer products have been widely used due to their low price and wide sources, among which modified starch occupies the first place, but when the modified starch is used for surface sizing, it is prone to powder falling off.

Method used

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  • Efficient surface sizing agent for paper and preparation method and application of efficient surface sizing agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of described surface sizing agent comprises the following steps:

[0028] (1) Pre-polymerization stage: Add 4-8wt% glacial acetic acid and 0.05-0.4wt% initiator into the reactor, stir and heat up; the temperature rises to 90-120°C, and start to drop 15-25wt% hard monomer, 5 ~15wt% cationic monomer, 0.5~4wt% unsaturated carboxylic acid, 6~11wt% glacial acetic acid, 0.2~0.6wt% initiator, the dropping time is 30~90min; Finished, and began to add 40 to 60 parts of deionized water dropwise, and the dropping time was 60 minutes; after the dropping, the temperature was lowered to 85°C, and kept for 30 to 45 minutes;

[0029] The hydrophilic-lipophilic equilibrium value of the prepolymer is 3-10, the critical micelle concentration is 0.2-0.7 g / L, the molecular weight is 10,000-100,000, and the content of dimethylamine or trimethylamine group is It is 0.4-0.6 mmol / g.

[0030] (2) Polymerization stage: Add 0.03-0.07wt% initiator and 0.01-0.03wt% defoamer ...

Embodiment 1

[0035] Pre-polymerization stage: Add 6wt% glacial acetic acid and 0.15wt% AIBN azobisisobutyronitrile into the reactor, stir and raise the temperature; when the temperature rises to 120°C, start to drop 20wt% St, 10wt% DMAPMA, 2wt% AA and 10wt% % glacial acetic acid, 0.4wt% AIBN, the dropping time is 60min; after the dropping, keep warm for 60min, after the warming is over, cool down to 100°C, and start adding 50 parts of deionized water, the dropping time is 60min; to 85°C and keep warm for 50min.

[0036] Polymerization stage: add 0.05wt% ferrous sulfate and 0.02wt% defoamer to the above prepolymer in the autoclave; continue to drop 40wt% St, 28wt% t-BA and 25wt% deionized water after stirring well , 3wt% concentration of 30% H 2 o 2 , the dropping time is 120min, and the dropping temperature is 80°C; at the end of dropping, keep warm at 80°C for 60min, add sodium hyposulfite formaldehyde and lower the temperature at the end of the warming, finally add 0.08wt% defoamer, an...

Embodiment 2～11

[0039] The reaction process of Examples 2 to 11 is the same as that of Example 1. Table 1 shows the composition, changes in reaction conditions and properties of the corresponding emulsion.

[0040] The corresponding English abbreviations in Table 1 are as follows: St-styrene; DMAPMA-dimethylaminopropyl methacrylamide; AA-acrylic acid; AIBN-azobisisobutyronitrile; T 1 - Reaction temperature in the prepolymerization stage; t 1 - monomer addition time + holding time in the pre-polymerization stage; t-BA-tert-butyl acrylate; T 2 - Reaction temperature in the polymerization stage; t 1 -Monomer & initiator dropping time + holding time in polymerization stage.

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Abstract

The invention discloses an efficient surface sizing agent for paper and a preparation method and application of the efficient surface sizing agent. The surface sizing agent is prepared through two stages of pre-polymerization and polymerization, and the surface sizing agent is prepared from the following polymerization monomers in percentage by weight: 55-75% of a hard monomer, 15-35% of a soft monomer, 5-15% of a cationic monomer, and 2-6% of unsaturated carboxylic acid. The high-potential polymer surface sizing agent has the high cationic property, and thus can be combined with a large number of hydroxyls on the surfaces of fibers, and thus the high-potential polymer surface sizing agent has very good water resistance, film formation and thermoplastic properties. A film layer formed through the efficient surface sizing agent is dense and smooth, on the one hand, the water resistance of the paper can be improved, so that the Cobb value of the paper is decreased, and the anti-damping capability is improved; and on the other hand, good strength performance can be given to the paper. In addition, the smoothness of the paper can further be improved, foam and impurities in the sizing process are reduced, and production stability is improved.

Description

【Technical field】 [0001] The invention relates to a surface sizing agent, in particular to a high-efficiency surface sizing agent for paper and its preparation method and application. 【Background technique】 [0002] At present, there are many kinds of chemical additives used in surface sizing, mainly including natural polymers and synthetic polymers. Natural polymer products have been widely used due to their low price and wide sources, among which modified starch occupies the first place, but when the modified starch is used for surface sizing, it is prone to powder falling off. With the rapid development of the petroleum industry and the continuous improvement of the polymer synthesis process, more and more polymer surface sizing agents are used in the paper industry. [0003] CN101558086B discloses a fine-grained cationic polymer dispersion obtained by emulsion polymerization of an ethylenically unsaturated monomer in an aqueous solution of a cationic prepolymer as a dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16
CPCD21H21/16
Inventor 张连腾米普科郑作宪张张陈翠张志高张志强汤银银
Owner 广东诚铭化学品有限公司
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