Preparation And Properties Of Polyguanidine Salt Modified Antifouling Materials For Fishing

Marine biological fouling refers to the biological fouling formed by the adsorption,growth and reproduction of marine microorganisms,plants and animals on marine facilities(such as ship hulls,buoys,bridge piers,cages and nets,etc).It contributes to marine development and maritime affairs.The activity brought many problems and caused serious economic losses.Aquatic nets such as fencing nets and nets for cages to prevent fouling organisms are called antifouling fishing nets.Due to the wide variety of marine fouling organisms and the ever-changing sea conditions in aquaculture,antifouling materials for fishing nets must be safe and environmentally friendly,resulting in antifouling of fishing nets.The pollution technology is more difficult.Therefore,the development of green and long-lasting antifouling materials for fishing nets is of great significance.Polyguanidine salt is a cationic polymer,and bacteria are electrostatically attracted to the cell membrane to achieve the ultimate sterilization purpose.Biofouling is induced by a biofilm composed of bacteria,so inhibiting the formation of bacterial biofilm is an important means to solve biofouling.Polyguanidine salt is a cationic polymer,and bacteria are electrostatically attracted to the cell membrane to achieve the ultimate sterilization goal.Based on this,we believe that polyguanidine salt can be used as a marine antifouling material with great development potential.This study intends to melt-spin polyethylene(PE)and polyguanidine salt graft modified polypropylene(PP-g-PHMG)by melt blending technology to obtain polyguanidine salt graft modified polypropylene/polyethylene monofilament(PP-g-PHMG/PE monofilament)with different contents,and by adding nano copper(Cu NP)material,study the influence of different Cu NP content on the blended monofilament,The mechanical properties,thermal properties,abrasion resistance,antibacterial properties,and antifouling properties of the guanidine salt graft copolymer modified fiber and its new fishing net materials have been studied.The results are as follows:(1)The PP-g-PHMG/PE alloy monofilament was prepared by the extrusion-melt spinning method,and the effect of different PP-g-PHMG content on the alloy monofilament’s microstructure,thermal properties,dynamic mechanical behavior,mechanical properties,and antibacterial properties.The results show that PP exists in the PP-g-PHMG/PE alloy monofilament matrix in the form of particles.With the increase of PP-g-PHMG content,the α transition peak in the high temperature zone gradually weakened,the breaking strength of PP-g-PHMG/PE alloy monofilament decreased,and the knotting strength increased with the increase of PP-g-PHMG content,this may be because the molecular chain becomes more irregular after the introduction of PHMG,which leads to an increase in toughness.In addition,PP-g-PHMG/PE alloy monofilament has obvious inhibitory effect on Escherichia coli and Staphylococcus aureus.(2)The PP-g-PHMG/PE/Cu NP alloy monofilament with different content was prepared by the reactive extrusion-melt spinning method,and the effect of different Cu NP content on the alloy monofilament’s microstructure,thermal properties,dynamic mechanical behavior and antibacterial properties.The results show that Cu NP is dispersed in the PP-g-PHMG/PE/Cu NP alloy monofilament matrix in the form of micropolymers.With the addition of Cu NP,the total crystallinity and crystallization temperature of the alloy monofilaments increased,indicating that they played a positive role in the heterogeneous nucleation of polymer blends.With the increase of Cu NP content,the breaking strength of PP-g-PHMG/PE/Cu NP alloy monofilament first increased and then decreased,while the knotting strength increased.The antibacterial test showed that the alloy monofilament had a significant inhibitory effect on Staphylococcus aureus.The antibacterial effect of PP-g-PHMG/PE/Cu NP alloy monofilament on Staphylococcus aureus is 38.36%higher than that of PE monofilament and 24.43% higher than that of PP-g-PHMG/PE alloy monofilament.(3)Using the monofilament prepared in content(2)and(3)as the matrix,the polyguanidine salt modified polyethylene fishing net was prepared by twisting/knitting,weaving and setting.To study the effect of grafted polyguanidine salt on the structure and properties of polyguanidine salt modified polyethylene fishing net materials(including breaking strength,wet breaking strength,abrasion resistance,etc.).The results show that the breaking strength of the PP-g-PHMG/PE fishing cable is 180.5N,which is slightly higher than that of the PE fishing cable of the same diameter(168.4N);the abrasion test shows that the PP-g-PHMG/PE fishing cable,PP-g-PHMG/PE/Cu NP fishing cable has better abrasion resistance PE fishing cable.A knotted net with a mesh length of 40 mm was prepared with a 4×3PP-g-PHMG/PE netting.Under the same diameter,the dry mesh breaking force of the PP-g-PHMG/PE netting is 183.6N,and the dry mesh breaking force of the PP-g-PHMG/PE/Cu NP netting is 183.1N,and the dry mesh breaking force of the two alloy material netting is equivalent,which is 14.39% higher than that of PE netting.After three months of marine coupon test,it was found that the weight gain of fouling organisms of PP-g-PHMG/PE/Cu NP netting was 50.1% lower than that of PE netting,and 27.7% lower than that of PP-g-PHMG/PE netting.