Deinking agent

Abstract

The invention relates to a special deinking agent for old newspaper (ONP), containing polyoxyethylene alkyl ether, polyoxyethylene polyol ester, fatty salt, lauryl sulfate, sodium lignosulfonate and inorganic matter; the deinking agent has good biodegradability, which greatly reduces environment pollution. As appropriate amount of foam can be maintained during processing, the deinking agent provides good practicability. High quality reclaimed pulp with high whiteness and low amount of residual printing ink can be obtained when the deinking agent is used. The deinking agent is liquid, usage and storage is convenient, and cost for deinking is low, thereby reducing processing cost.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a formula of a special deinking agent for old newspapers. Background technique [0002] Waste paper deinking is a new direction for the development of the paper industry in recent years. From the perspective of effective use of natural resources and environmental protection, the reuse of waste paper has become more important. Especially the deinked pulp of old newspapers is widely used in the production of newsprint, super calendered paper and other fields. [0003] In the production process of papermaking using secondary fiber, it is generally mixed with the following reagents for treatment: adding alkaline reagents such as sodium hydroxide, sodium silicate, etc., adding bleaching agents such as hydrogen peroxide, and chelating agents such as EDTA, and then adding as a dehydrating agent. One or more surfactants of the ink. There are two types of deinking agents: flotation ...

AI Technical Summary

Problems solved by technology

However, the traditional deinking agent only considers the deinking performance, and uses difficult-to-biodegrade surfactants containing benzene rings such as nonylphenol polyoxyethylene ether, which aggravates the pollution to the environment

[0005] Although the compounds used in some patents have excellent biodegradability, their performance as a deinking agent itself is very insufficient

[0006] On the other hand, with the advancement of deinking equipment such as drum pulper, heat disperser, etc., the deinking efficiency has been greatly improved, but at the same time, the peeled ink also tends to be micronized

The traditional anionic surfactant-based deinking agent has poor ability to capture and peel off small ink particles, so it is difficult to obtain high-quality old newspaper recycled pulp with high whiteness and low residual ink

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