Sizing agent is one or more of film forming of high polymer material, its function is made into pulp pad on the fabric, attached to the fabric surface, after dry form skin film wrap fabric surface, so as to give the fabric a smooth, thick, plump, stiff handle. When the slurry is configured, the filling agent is added at the same time to increase the weight of the fabric and fill the holes to make the fabric smooth and thick.
Can one or more of film forming of high polymer material, its function is made into pulp pad on the fabric, attached to the fabric surface, after dry form skin film wrap fabric surface, so as to give the fabric a smooth, thick, plump, stiff handle. Sizing finishing with the conversion of starch and starch paste products dextrin and soluble starch, and sodium alginate, cattle glue, carboxymethyl cellulose (CMC), sodium zinc acid cellulose, polyvinyl alcohol (PVA), polyacrylic acid, etc., the slurry can be used alone can also be mixed according to the requirements. When the slurry is configured, the filling agent is added at the same time to increase the weight of the fabric and fill the holes to make the fabric smooth and thick. Common fillers are talc, kaolin and bentonite. In order to prevent the slurry from spoilage, it also added phenol, ethyl naphthol and other preservatives.
The making of paper pulp
Cellulose activity of sizing agent, such as those based on alkyl ketene dimer (AKD) and chain alkenyl succinic anhydride (ASA) material, widely used in slurry in water or slightly alkaline PH value of the paper, in order to a certain extent, improve the paper or cardboard water-based liquid wetting and penetration resistance. The paper sizing based on the cellulose active sizing agent is usually carried out in a dispersive manner. It consists of a particle or droplet of the very fine pulping agent that is separated by water and dispersed in it. Preparation of dispersion, usually with the aid of dispersant system it with anionic compounds such as sodium lignin sulfonate, cooperate with high molecular weight cationic and amphoteric polymer, such as cationic starch, polyamine, polyamide - amine or alkene addition polymer composition. Depending on the total charge of the dispersant system compounds, the pulping dispersion would be cationic or anionic in the body.
The total charge of the compound is either cationic or anionic on the body.
In the case of low sizing agent, cellulose reactive sizing agent usually shows good sizing. Practice has proved, however, when used in a high degree of cationic Demand (Demand) and wood extract contains significant amount of hydrophilic, such as fat, fatty acid, ester resin acid and triglycerides, slurry, usually the efficiency of the cellulose activity of sizing agent will suffer. In view of the anionic properties of the oil-friendly substances with carboxylate or carboxylic acid groups, the slurry containing significant amounts of hydrophilic extract usually has a high degree of cationic demand. It has been found that the oil-friendly substances are not good for the adsorption of the plasmizer on the fiber and may result in poor sizing results. In order to improve the sizing of slurry, paper makers have to increase the dosage of sizing agent, this is, of course, are reluctant to accept in terms of economy, and increase sizing agents in papermaking process of recirculating water accumulation. This problem is even more serious in paper mill, in which recirculation water depth, process introduced only a small amount of fresh water, it will further aggravate cationic demand degree and water and dehydration in the slurry lipophilicity extract and the accumulation of the adsorption of sizing agent.
Therefore, one of the purposes of the present invention is to provide cellulose modified dispersion of active sizing agent and ultimately improve the sizing process, the activity of cellulose dispersoid used in sizing agent with a high degree of cationic demand and/or extract content and/or high hydrophilic through recycling process water depth of cellulose in the slurry.
Found that cellulose containing a hydrophobic modified dispersant aqueous dispersions of active sizing agent is applied to a high degree of cationic demand of material and/or high level hydrophilic slurry sizing inside body, can realize the improvement of sizing. Also have found that the dispersion was applied to a papermaking technology, which due to recycle water depth has a high degree of cationic demand and/or high lipophilicity extract content, also can realize the improvement of sizing. Therefore, this invention relates in general by cellulose activity of sizing agent and hydrophobic modified dispersant aqueous sizing dispersoid purposes, for difficult to sizing paste within the body of the sizing, add sizing dispersoid to the slurry containing cellulose fibre and optional packing, slurry dewatering on the net, then get contain cellulose fiber fabric or paper.