ES Fiber Hydrophilic Oil Agent Based On Anionic And Cationic Surfactant

ES nonwoven fabrics with repeatedly hydrophilic functions are the preferred material of high-grade sanitary coverings.For a long time,due to the lag of the development of domestic hydrophilic oil agents,related products have been relying on imports,and prices are monopolized by foreign products.In order to reverse this situation,based on the previous research of the research group,this paper aims to develop a silicon-free antibacterial ES fiber hydrophilic oil agent product,and carried out a series of basic research and industrial application optimization experiments,including relationship between structure and performance of surface/interface properties of anionic-cationic surfactant compound system;principle,microscopic mechanism and influencing factors of repeatedly hydrophilic action of ES nonwoven fabric after hydrophilic finishing;optimization of oil agent formulation;Pilot and performance evaluation of ES fiber hydrophilic oil agent.The main results and conclusions are as follows:1.Surface/interface properties of anionic,cationic surfactants and their compound systems.Single-component anionic and cationic surfactants,as the hydrophobic chain grows in a certain range,the?_cmc of the single hydrophobic chain surfactant decreases first and then increases,the wetting and spreading ability on the PE film increases first and then decreases;For double hydrophobic chain surfactants,?_cmc is significantly lower than the same chain long single hydrophobic chain surfactant,the wetting and spreading effect is also better than single hydrophobic chain surfactant.Two-component long hydrophobic chain anionic and cationic surfactants mixtures.The closer to the equimolar ratio,the easier it is to form aggregation or precipitation,and the larger?_cmc,the worse wetting and spreading on the PE film;The fixed hydrophilic group,the same hydrophobic chain matching anionic and cationic surfactant compounding,within a certain chain length range,the longer the hydrophobic chain,the easier to form aggregation or precipitation,the larger?_cmc,the worse wetting and spreading;The same cationic surfactant of the longer hydrophobic chain is compounded with anionic surfactant having the same hydrophobic chain length and the different hydrophilic groups,the stronger charge interaction,the easier to form aggregation or precipitation,the larger?_cmc,the worse wetting and spreading.2.Repeatedly hydrophilic influence factors,principles and microscopic mechanisms of anionic,cationic surfactants and their compound systems.The repeatedly hydrophilic properties of single-component anionic and cationic surfactants are closely related to the hydrophobic chain length and the hydrophilicity of the hydrophilic groups.Good spreading performance is beneficial to the first hydrophilic permeable;The hydrophilicity of the hydrophilic group is appropriate,the longer the hydrophobic chain in a certain range,the worse the solubility,the stronger the adsorption force with the fiber,the better repeatedly hydrophilic performance;The anionic and cationic surfactants are compounded,hydrophilic groups are suitable for hydrophilicity,and the hydrophobic chain length is within a certain range,the longer the hydrophobic chain,the more the hydrophobic chain length matches,and the stronger the adsorption force with the fiber,the better repeatedly hydrophilic property;But the hydrophobic chain is too long,it is easy to form a aggregates or precipitate,which is not conducive to repeatedly hydrophilic.Microscopic mechanism of repeatedly hydrophilic interactions of surfactants on ES nonwovens.As the concentration increases,Anionic and cationic surfactants and their compounding at the PE-liquid interface,first of all,Adsorbed to the PE surface with a flat or inclined,and the non-polar hydrocarbon chains are attracted to the non-polar PE surface by the dispersive force,polar group points to water,as the adsorption continues,surfactant gradually aligned,until a saturated adsorption monolayer is reached.The same is true for anionic and cationic surfactants,which is alternately arranged positive and negative at the PE-liquid interface to form a saturated adsorption hydrophilic monolayer,until a saturated adsorption hydrophilic monolayer is reached.Surfactant adsorbs on the surface of the fiber to form a hydrophilic layer,when hydrophilic and permeable,surfactant first undergoes re-dissolution process,Part of the surfactant dissolved in the water,Reduce the surface tension of water and spread it quickly on the fiber,and penetrates the nonwoven fabric.Undissolved part of the surfactant forms a hydrophilic layer,hydrophilic water conduction,the water quickly passes through the nonwoven,the two combine to form multiple hydrophilic effects.3.Optimization of ES fiber hydrophilic oil formulation,product pilot and product performance evaluation.A hydrophilic oil agent compounding solution that satisfies repeatedly hydrophilic properties is obtained,that is,a surfactant with good spreading property is compounded with a long hydrophobic chain washable surfactant,add nonionic surfactant,non-equimolar ratio of the anionic and cationic surfactants are compounded.Finally,get XM-4,XK-4,XN-4,XL-4 four excellent hydrophilic oil agent formulations,ES fiber pilot test for hydrophilic oil XM-4,and production ES antibacterial nonwoven fabric with pilot fiber.Non-woven fabric production is normal,qualified products,ES fiber specific resistance is 3.0×10⁷?·cm,oil rate is 0.38%,ES antibacterial nonwoven fabric has repeatedly water permeable time within 2 seconds,reached and exceeded the repeatedly hydrophilicity of foreign oil agent 2099antibacterial property,20 minutes bacteriostatic,bacteriostatic rate greater than 80%,all achieved the expected results.