Synthesis Of Polybetaine Antibacterial Agent And Its Applications In Cotton Fabrics Finishing

Cotton fabrics are favored by people for their comfortable wearing,renewable,green en-vironmental protection,and easy biodegradation.However,the cellulose macromolecular struc-ture chain contains many hydroxyl?-OH?groups,leading to its hydrophilic properties.Cotton fabrics as porous materials are extremely susceptible to dirt,providing a suitable environment and material basis for the growth and reproduction of microorganisms.Not only does it reduce the quality and physical properties of the textile,but also cause potential harm to the human body.Therefore,antibacterial finishing for fabrics in order to inhibit or kill microorganisms is particularly important.Most antibacterial cotton fabrics have a lack of a simple,steady and efficient antibacterial finishing approach.The challenge is to develop a durable and high effi-ciency agents to meet antibacterial finishing requirement.In this work,a new polysulfobetaine,namely poly?sulfobetaine-acrylamide-allyl glycidyl ether??PSPB-AM-AGE?,was designed and synthesized as an antibacterial finishing agent for cotton fabrics.The monomer of primary interest is a zwitterironic sulfopropylbetaine?SPB?that served as microbiocidal and antibacterial adhesion group.Among them,SPB is used as a bacteriostatic functional monomer.For covalent anchoring on the cotton fabrics,allyl glycidyl ether?AGE?,highly reactive with nucleophiles via nucleophilic reaction,was selected as func-tional group.To avoid gelation,we introduced acrylamide?AM?into the copolymers as link group in the react of polymerization.Furthermore,PSPB-AM-AGE was grafted on cotton fab-rics by covalent bonding between epoxy ring opening and cellulose hydroxyl groups on the molecular chain of the antibacterial agent,and its antibacterial activity was studied.The specific findings of the paper are as follows:?1?Synthesis and characterization of sulfobetaine?SPB?and polysulfobetaine?PSPB-AM-AGE?.A sulfobetaine compound?SPB?with reactive groups was synthesized from N,N-di-methylallylamine and propane sultone,and its structure was analyzed by elemental analysis,FTIR and ¹H-NMR Characterization.After that,polysulfobetaine?PSPB-AM-AGE?was pre-pared by free-radical polymerization of AM,SPB,and AGE monomers.The characterization of FTIR and ¹H-NMR confirmed the success of the preparation.Through orthogonal experi-ments,the effects of synthesis reaction temperature,reaction time,amount of initiator,ratio of betaine and acrylamide on the antibacterial rate of the product PSPB-AM-AGE were discussed.The optimal process conditions for the synthesis were:when the temperature was 70?;mean-while the molar ratio of betaine to acrylamide is 2:1 and the amount of initiator is 2%;the reaction time is 4 h as well.?2?Antibacterial performance of polysulfobetaine?PSPB-AM-AGE?.The minimum bac-teriostatic concentration?MIC?of PSPB-AM-AGE against E.coli and S.aureus was 2.625 g·L^-1 by using viable count method.The antibacterial kinetics test of PSPB-AM-AGE showed that the number of E.coli was close to zero after the contact time of PSPB-AM-AGE with E.coli was 4 h.?3?Preparation and characterization analysis of PSPB-AM-AGE modified cotton fabric.PSPB-AM-AGE was used as an antibacterial finishing agent,and it was finished on cotton fabrics by a rolling and baking process.FTIR,XPS,and SEM confirmed that PSPB-AM-AGE was grafted onto cotton fabrics.The effects of PSPB-AM-AGE concentration,bath ratio,soak-ing temperature,pre-baking temperature,and baking temperature on the antibacterial properties of the finished cotton fabric were investigated using a single factor experiments to obtain the optimal process:the concentration of PSPB-AM-AGE was 36 g·L^-1,and the bath ratio was 1:20,while the immersion temperature was 40?,as the pre-baking temperature was 70?,and the baking temperature was 165?.?4?Antibacterial properties of PSPB-AM-AGE treated cotton fabric.Using the shaking method and viable count method to test the antibacterial washing fastness of the cotton fabric after the optimal process,the results showed that the antibacterial rate of the finished fabric to E.coli and S.aureus was 95.18%and 98.74%,respectively.Washing fastness test shows that PSPB-AM-AGE finished fabrics have excellent washability.In addition,the cotton fabric treated with PSPB-AM-AGE showed good antibacterial adhesion properties.?5?Comprehensive properties of PSPB-AM-AGE treated cotton fabric.After finishing of PSPB-AM-AGE,the hydrophilic properties and moisture permeability of cotton fabrics have been greatly improved,the mechanical properties,air permeability,and whiteness have been slightly reduced,and the thermal stability has not been significantly adversely affected,and it has generally met the requirements.