This invention discloses a precursor of a monochlorotriazine
halogen amine
antibacterial agent for low-temperature, low-salt finishing, its preparation method, and a cotton fabric and finishing method thereof. The precursor incorporates a 5,5-dimethylhydantoin derivative group linked by a hydrophilic group of
sodium p-benzenesulfonate and an
ether bond, and is prepared by a temperature- and pH-controlled reaction of
cyanuric chloride with
sodium p-aminobenzenesulfonate and 3-(3-chloro-2-hydroxypropyl)-5,5-dimethylhydantoin. The cotton fabric finishing process involves precursor
dissolution, neutral salt impregnation, low-temperature weak alkali
grafting, and chlorination. The process includes impregnation at 25-40°C and alkali reaction at 15-35°C, with a neutral salt concentration of 20-60 g / L and an alkali concentration of 0.5-2 g / L. The precursor has excellent water
solubility and
fiber compatibility. The finishing process inhibits
hydrolysis and reduces
energy consumption. The treated cotton fabric has a kill rate of over 99.99% against
Staphylococcus aureus and
Escherichia coli within 1 minute. After 50 washes, the active
chlorine recovery rate exceeds 80%. It has high strength retention, is energy-saving,
environmentally friendly and easy to industrialize.