Paper is made from pulp. Pulp is made from certain plants, such as wood, grass, cotton as raw materials, using chemical or mechanical methods to remove all or most of the impurities, to obtain a pure or nearly pure plant fiber pulp.
Pulp in addition to the main component of the composition of the fiber cellulose, but also contains hemicellulose, lignin and a small amount of resin, pigment, gum and other substances. In terms of papermaking, cellulose and hemicellulose is the basic components of pulp, and other impurity components present in the pulp on the quality of paper caused by adverse effects, in the papermaking process should be removed as far as possible, so the formation of paper in the process requires the use of chemical additives. Chemical additives can be divided into two categories of process additives and functional additives, process additives are to promote and improve the efficiency of the paper sheet formation process to prevent fluctuations and interference chemicals, including retention agents, filtering aids, resin control agents, defoamers, molding aids, preservatives, net and felt cleaning agents, etc.; functional additives are to improve the end product performance and quality of chemicals, including dry strength agents, wet strength agents, sizing The functional additives are chemicals to improve the performance and quality of the final product, including dry strength agents, wet strength agents, sizing agents, fillers, dyes, whitening agents, softeners, etc. In the pulp and paper industry, surfactants are widely used as chemical auxiliaries in the process of cooking and pulping, waste paper deinking, paper copying, finishing, paper processing, wastewater treatment, etc., which play an important role in improving the process, improving product quality, increasing economic efficiency and reducing environmental pollution.
For example, surfactants in the cooking pulp as a resin remover and dispersant and wood chips and cotton fiber penetration agent; in the process of manufacturing recycled pulp from waste paper as a waste paper deinking agent; in the paper sizing process as a sizing agent and emulsifier; in the paper copying process as antifoaming agent, felt cleaning agent; in the paper coating as a dispersant, defoamer, lubricant, preservative, antistatic agent, emulsion stabilizer; in the processing of thin paper products as a softener and wetting agent.
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