Method for preparing papermaking dry strengthening agent

Abstract

The invention discloses a method for preparing a papermaking dry strengthening agent. The method comprises the following steps of: dissolving a mixture of 0.5 to 2.5 weight percent of modified starch and polyanionic cellulose by using pure water; then adding a copolymerized blended monomer consisting of acrylamide, acrylic acid or ester thereof, carboxylic acid ester and acrylonitrile into the mixture solution; after the substances are mixed completely, raising the temperature of the mixture to between 30 and 60 DEG C, and reacting the mixture for 1 to 3 hours at the temperature; adding pH regulator to regulate the pH value of the mixture to between 5.5 and 7, and adding cross-linking prevention agent, reaction inhibitor, regulator and multi-element composite catalyst in the reaction under the pH condition by adopting a one-step grafting copolymerization reaction technology respectively; and performing ageing reaction after the grafting copolymerization reaction is completed, adding acuring agent in the ageing reaction process, heating the reactants to the temperature of between 65 and 78 DEG C, and obtaining the papermaking dry strengthening agent after ageing for certain time. The papermaking dry strengthening agent can remarkably improve the dry strength and the tearing strength of paper.

Description

Technical field: [0001] The invention belongs to the technical field of auxiliary agent preparation in papermaking technology, and relates to a preparation method of papermaking dry strength agent. Background technique: [0002] Among the currently used dry strength agents, starch-based dry strength agents almost occupy most of the market share. However, starch is used as a dry strength agent. From the point of view of its use process, it needs to be gelatinized and diluted with steam, and then passed through a pump. The process is complicated, and the investment in equipment and personnel is increased; and the papermaking system uses a large amount of starch for a long time. As a reinforcing agent, it pollutes the white water of the paper machine more. In addition, the cooking and gelatinization of starch requires power consumption, which consumes both gas and electricity, which is not conducive to energy saving and emission reduction; from the use effect of the dry streng...

AI Technical Summary

Problems solved by technology

However, starch is used as a dry strength agent. From the point of view of its use process, it needs to be gelatinized and diluted with steam, and then passed through a pump. The process is complicated, and the investment in equipment and personnel is increased; and the papermaking system uses a large amount of starch for a long time. As a reinforcing agent, the pollution to the white water of the paper machine is relatively large

In addition, the cooking and gelatinization of starch requires power consumption, which consumes both gas and electricity, which is not conducive to energy saving and emission reduction; from the use effect of the dry strength agent made by the existing technology, the paper products produced by using it as an auxiliary agent: For example, the transverse ring compressive strength of corrugated paper is 5-7N.m / g, and the burst index of kraft paperboard is only 1.5-2.0kpa.m 2 / g, the folding endurance of the above two kinds of paper is only 20 times, and the bursting strength is poor

In addition, in the raw materials of my country's papermaking industry, due to the shortage of wood resources, the papermaking raw materials currently used in large quantities are mainly straw pulp and waste paper pulp. strength

[0003] In summary, the preparation method of dry strength agent in the prior art has the defects of high cost, high energy consumption, complicated production process, and the produced dry strength agent is poor in improving folding resistance, ring crush strength, and burst strength.

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