PAM for short, the structural formula is [- CH2-CH( CONH2)] N -, the molecular weight in between 4-20 million. Polyacrylamide primarily has 2 kinds of product forms, one is the look of white or slightly yellow powder, soluble in water, the speed is very slow, increase the temperature level can slightly advertise dissolution, but the temperature level shall not go beyond 50 ℃, in order to stop molecular deterioration, hard to liquify in organic solvents. One more is colorless viscous colloid, as well as polyacrylamide solution (Shanghai synthetic material Research Institute). Neutral, safe. Polyacrylamide stored in an awesome, aerated, dry warehouse, dampness, light, warmth. The storage space time should not be as well long. Polyacrylamide is split into cationic kind, anionic type, amphoteric ion and also non-ionic type according to framework.

Cationic polyamide (CPAM)
Cationic polyacrylamide (CPAM) is a type of cationic devices and acrylamide copolymer of non ionic systems, with its molecular chain can ionization of positive group (CONH2), in the water can be ionized into polycation and also little anion, and spread in the service of put on hold bit adsorption and linking, has strong flocculation. Cationic polyacrylamide is commonly used in water therapy as well as metallurgy, paper production, oil, chemical sector, textile, mineral processing and various other fields, as a thickener, flocculant, drag reducer, with gel, sedimentation, reinforcement as well as various other functions. The molecular weight of CPAM is generally lower than NPAM and APAM, specifically appropriate for the dewatering treatment of local sewer, local sludge, papermaking sludge and also various other commercial sludge.

In the synthesis of cationic polyacrylamide extra commonly made use of cationic monomers are methyl acryloxyethyl trimethylammonium chloride (DMC), acryloxyethyl trimethylammonium chloride (DAC), dimethyl diallyl ammonium chloride (DMDAAC), acryloyl aminopropyl trimethylammonium chloride (AMPTAC), methacrylate -2-( N, N-dimethylamino) ethyl ester (DM), acrylic acid -2-( N, N-dimethylamino) ethyl ester (DA), etc. DMDAAC, DAC and DMC are extra typically made use of.

( 1) of DMDAAC.
Dimethyl diallyl ammonium chloride is a high pureness, polymerization grade, quaternary amine salt, high charge density cationic monomer, including trace sodium chloride as well as various other pollutants (controlled variety), molecular formula is C8H16NCl, molecular weight. The molecular framework includes alkenyl double bonds, which can form linear homopolymers and also numerous copolymers with numerous polymerization responses. DMDAAC as cationic monomer with homopolymerization or copolymerization to form polymer. In the process of water therapy can be used for decolorization [4], flocculation as well as purification, effective and safe; Among everyday chemicals, carding agents, moistening representatives and antistatic representatives can be used for hair shampoo; In oilfield chemicals, it can be made use of as flocculant, water obstructing agent, and so on( 2) The Methyl acryloxyethyl trimethyl ammonium chloride (DMC).
Methyl acryloxyethyl trimethyl ammonium chloride (DMC), chemical formula CH2= C( CH3) COOCH2CH2N (CH3) 3C L -. DMC is a cationic monomer, which can be homopolymerized or copolymerized with various other monomers to prepare a cationic polymer. The polymer has solid polarity and also fondness to anionic materials, so it can be commonly utilized as a cationic flocculant. It can be used in sludge dewatering process of sewage therapy plant as well as wastewater treatment of papermaking, coal flotation protection, printing, dye and also other sectors. Additionally, DMC can likewise be utilized to generate acid resistant superabsorbent materials and also oilfield chemicals.

( 3) The Acryloxyethyl trimethyl ammonium chloride (DAC).
Acryloxyethyl trimethyl ammonium chloride (DAC) is a quaternary ammonium salt generated by the reaction of dimethylaminoethyl acrylate as well as chloromethane, soluble in water. Molecular formula: CH2= CHCOOCH2CH2N( CH3) 3Cl-. Mainly made use of for homopolymerization or copolymerization with acrylamide to prepare cationic polymer flocculant. It is now preferred to be changed by methylacryloxyethyl trimethylammonium chloride.