what is retention aid?

Type of retention aid

Retention agents currently used mainly in the following categories. ( 1 ) conventional retention aid - including unit and dual systems . They are characterized by high polymer added to the machine outlet pressure screen . Retention aids to conventional polymer -based, before you can add alum, polyaluminum chloride (PAC) or the fusing agent. Common set of agent Polyamine, Polydadmac and Polyethyleneimine. ( 2 ) particle retention aid - and microparticles by a cationic polyacrylamide composition . Microparticles was the last to join the chemical. The particles used as Bentonite, Silica and micropolymer.

Retention aid characteristics

Retention agents include a variety of systems, components and products, but generally have the following five features : ( 1) adding wet Retention aid is used only for the wet end , the pulp is added . ( 2 ) retention and drainage Retention aids must generate retention and drainage effects, otherwise it is not a retention aid . ( 3 ) flocculation mechanism

With " flocculation " as the mechanism . Flocculation is divided into " flocculation " and " cohesion ", the former refers to the use of long-chain polymer particles in different " bridging " floc formation process ; latter refers to aluminum , will depend on the agents or particles charge role would become a collection of different particles floc process. Flocculating the particles closer to each other , and the evenness of paper fibers are dispersed requirements needed just the opposite , so the retention aid for evenness of paper generally has a negative effect , the effect is too strong , makes the evenness deteriorated.

( 4 ) molecular weight Retention aid system plays a major role in the polymers . If you do not produce polymer flocculation , relying on other retention chemicals generally difficult to obtain the required one-way machine retention rate . Therefore , retention aid systems typically include at least one polymer product. Other chemicals , such as aluminum salts , given the agent and microparticles called aid polymerization inhibitor , primarily play a supporting role , with the use of polymers .

( 5 ) sieve after adding Chemical flocculation floc produced , easily damaged by shear force , so the appropriate retention agents to join point is the best system to play an important role in protection . Machine shearing force sizing system is the largest equipment fan pump and pressure screen , in order to avoid destruction of floc strong shear force , the use of retention aids need to add at least one chemical after the pressure screen . Under normal circumstances , you can not put all the retention aid products added to the pressure sieve before .

About us

Retention & Drainage Aid & Reinforcing Agent suppliers--Nanjing Bende Chemical Industrial Co.Ltd  was established in 2000 to manufacture chemical auxiliaries for paper-making industry. "We must not merely seek business profits but must contribute broadly to society through our business activities." Nanjing Bende Chemical, founded with the goal of promoting the development of paper-making industry, has upheld this founding principle as it has evolved in keeping with the changing times.

We always attach great importance to R & D of new products, such as: Fluorescent Whitening Agent, Lubricant, Water Retention Agent, Retention Agent & Drainage Aid & Reinforcing Agent, Water Repellent Agent, Cation Adhesive, Reservation Agent & Filtration Agent, and are armed with gas chromatograph, titration apparatus and ultraviolet spectrophotometry. Our main products are: Water Retention Agent for coating, Water-repellent Agent, Fluorescent Whitening Agent and the like. All of them have a complete range of specifications and steady good quality. The products of our company are sold well all over the world and have achieved the customers' believe and praise.