1.Overview of Poly Dimethyl Diallyl Ammonium Chloride (PDDAC）

Poly Dimethyl Diallyl Ammonium Chloride (PDDAC) is an important cationic monomer known for its high purity, polymer grade, and high charge density. It has a wide range of applications across various fields, including water treatment, textiles, papermaking, and oilfield additives.

2.Basic Properties and Application Areas of PDDAC

PDDAC is a water-soluble monomer with excellent chemical stability and biocompatibility. It is stable at room temperature, does not hydrolyze, is non-flammable, has low skin irritation, and low toxicity. Below are the main application areas ofPDDAC:

1. Water Treatment

Flocculant: PDDAC can effectively remove suspended particles and water-soluble substances with negative charges from water, making it suitable for drinking water treatment, industrial water, and various wastewater treatments.

Decolorization and Purification: In water treatment processes,PDDAC can be used for decolorization, flocculation, and purification, being efficient and non-toxic.

2. Textile Dyeing and Finishing

·Formaldehyde-Free Fixative: PDDAC forms a film on fabrics, enhancing dye fastness, and is an excellent formaldehyde-free fixative.

Papermaking

·Retention Aid and Antistatic Agent: PDDAC can be used as a papermaking additive to improve the antistatic performance of coated paper.

3. Daily Chemical Products

·Conditioner, Wetting Agent, and Antistatic Agent in Shampoos: PDDAC provides excellent conditioning, modification, and antistatic effects in these products.

4. Oilfield Chemicals

·Flocculant and Water Blocking Agent: PDDAC is used in oilfield chemicals as a flocculant and water blocking agent, helping to improve oilfield extraction efficiency.

3.Preparation Methods of PDDAC

The preparation of PDDAC typically employs a solution polymerization method. The specific steps are as follows:

1. Heat a 70% solution of Dimethyl Diallyl Ammonium Chloride monomer to 80°C, adjust the pH to 4-6, and deoxygenate with nitrogen for 1 hour.

2. Add an appropriate amount of initiator, such as Azobisisobutyronitrile (AIBN) or Diisopropyl Peroxide (IPP), and polymerize at 80°C for 4 hours.

3. After polymerization is complete, dilute the mixture to the desired concentration for discharge.

4.Safety and Precautions

Although PDDAC is non-toxic, the following precautions should still be observed during use:

·Protective Measures: Operators should wear protective gear to avoid skin contact and inhalation of allyl chloride vapors.

·Storage Conditions: PDDAC should be stored in a cool, dry place, avoiding high temperatures and direct sunlight. Long-term storage may lead to stratification, but stirring before use does not affect its efficacy.

5.Market Prospects and Application Examples of PDDAC

With the increasing awareness of environmental protection, PDDAC, as an efficient and non-toxic organic polymer water treatment agent, has a steadily growing market demand. Examples of its application in source water purification and wastewater treatment include:

·During the flood season for rivers with high turbidity raw water,PDDAC can effectively coagulate clay, silica, microorganisms, and hydrated metal oxides, enhancing treatment effectiveness.

In summary, Poly Dimethyl Diallyl Ammonium Chloride (PDDAC) has become an indispensable important chemical in modern industry due to its unique physicochemical properties and wide range of applications.