Preparation And Properties Of Water-soluble Surlyn Film And Surlyn Nonwoven Composite Film

The purpose of this study is to modify the air permeability of water-soluble Surlyn film and film-forming properties of water-soluble Surlyn solution,so as to broaden the application range of Surlyn.At the same time,PVA modified water-soluble Surlyn PP non-woven composite membrane was prepared,which has good waterproof,breathable,moisture permeable,antibacterial performance.It provides a new disposable protective material for the field of medical protection.First of all,KOH was used to modify the air permeability of Surlyn film.Surlyn and KOH were blended and dissolved to prepare KOH/Surlyn film with good permeability.It was found that when the KOH content was2%of Surlyn,the Surlyn was completely neutralized,the crystallinity of Surlyn decreased and the KOH/Surlyn film were smooth.Its air permeability increased slightly,the breaking elongation increased,the tensile strength decreased.When the content of KOH was 4%or more than,the phase separation of KOH and Surlyn occurred and with the increase of KOH content,the air permeability of KOH/Surlyn film increased,but the mechanical properties decreased.KOH/Surlyn film had good air permeability and moderate mechanical properties,when the content of KOH was 4%of Surlyn.Secondly,PVA1799 was used to modify the Film forming performance of Surlyn solution.PVA solution was blended with the optimal ratio KOH/Surlyn（4%）solution,to prepare PVA modified water-soluble Surlyn（PVA/Surlyn）film by flow casting.It was found that PVA and Surlyn could form hydrogen bonds.The compatibility between PVA1799 and Surlyn was better when the blending temperature was 25℃.With the increase of the standing time of the mixed solution,the viscosity of PVA/Surlyn mixed solution first increased and then stabilized.With the increase of PVA content,the viscosity of PVA/Surlyn mixed solution increased gradually.PVA/Surlyn films still had phase separation on the surface and had good water resistance.With the increase of PVA content,the air permeability of the PVA/Surlyn films decreased and the mechanical properties increased.When the content of KOH was 4%and the content of PVA was 2%,the comprehensive performance of PVA/Surlyn film was good.Finally,the optimal PVA/Surlyn film was attached to PP nonwoven to prepare PVA modified water-soluble Surlyn PP nonwoven composite membrane.It was found that the air permeability of the composite membrane was 3369.25 L/m²/s,the moisture permeability was 3040.52g/m²·d,the hydrostatic pressure resistance was 3 KPa（17cm H₂O）,the contact angle with water was 44.52°,the breaking strength was 86～50 N,and the breaking elongation was 45%～30%.All the properties were higher than the requirements of the national standard and the antibacterial effect was good.