Sodium methallyl sulfonate (SMAS) can be used to prepare strongly acidic cation exchange resins. The specific preparation process is as follows:
1. Copolymerization Reaction
(1) Monomer Ratio:
- Sodium methallyl sulfonate (SMAS): 20-40%
- Crosslinking agent (divinylbenzene DVB): 5-15%
- Comonomers (styrene/acrylate type): 45-75%
(2) Polymerization Process:
- Suspension polymerization method
- Reaction temperature: 60-80°C
- Initiator: benzoyl peroxide (BPO) or azobisisobutyronitrile (AIBN)
- Reaction time: 6-10 hours
2. Post-treatment
(1) The product is washed and dried to obtain white bead-like resin
(2) Particle size control: 0.3-1.2mm
3. Performance Characteristics
- Exchange capacity: 2.0-3.5mmol/g
- Temperature resistance: ≤120°C
- Applicable pH range: 0-14
4. Application Fields
- Water treatment (water softening)
- Catalytic reactions
- Metal recovery
Precautions:
- Excessive SMAS content will affect resin mechanical strength
- Crosslinking degree must be strictly controlled (typically 5-8%)
- Appropriate dispersant (such as PVA) should be added during polymerization
For more detailed process parameters or formulation optimization suggestions, further discussion is available.
