Research On The Performance Of Rope And Net Based From UHMWPE Split Film Fiber

Ultrahigh molecular weight polyethylene（UHMWPE）fiber is widely used in fishery because of its excellent comprehensive properties,but UHMWPE fiber which is used as the matrix material of rope net at present is multifilament.However,the higher preparation cost of UHMWPE fiber limits its further promotion and application.As a special new type of high-performance split film fiber material,UHMWPE split film fiber is a continuous strip with a certain fineness and strength,which is formed by cutting and bundling the film or directly bundling the film.It not only has the excellent chemical resistance,weather resistance,waterproof and light resistance of UHMWPE,but also has more obvious advantages in the preparation cost and wear resistance.Therefore,it can be used as a choice of fishing rope net material.In order to further explore the properties of UHMWPE split film fiber and its rope net,the thermal properties,mechanical properties and wear resistance of split film fiber were studied by differential scanning calorimetry,dynamic mechanical properties analysis,universal testing machine and abrasion tester,and compared with UHMWPE monofilament and multifilament.In addition,UHMWPE split film fiber is used as the matrix material of rope net instead of traditional fiber,and the comprehensive performance of rope net made of UHMWPE split film fiber is compared and analyzed with traditional PE rope net and UHMWPE multifilament rope net.The results show that:（1）the crystallinity of UHMWPE split fiber（1600 D）is 85.94%,which is higher than that of UHMWPE monofilament（65.53%）and multifilament（83.99%）.The melting temperature is also up to 161.3℃.Compared with UHMWPE monofilaments and multifilaments,the creep resistance of UHMWP（1600 D）fiber is better than that of UHMWPE monofilaments,especially in the creep recovery process,the creep recovery strain of split film fiber（1600 D）is 0.03%under 25%stress.Under normal conditions,the breaking strength of UHMWPE fiber（1600 D）is 253.77 c N/dtex,and it has a good strength retention rate in the nodular state.In addition,with the increase of linear density of HMWPE fiber,the fiber elongation at break increases,while the fiber breaking strength under normal condition is opposite to that under nodule.Under the same friction and wear conditions,the strength retention rate of UHMWPE split fiber（1600 D）is 85.79%,which is higher than that of UHMWPE monofilaments（38.81%）and UHWMPE multifilament,especially in wet condition,the strength retention rate of UHMWPE splitfilm fiber（1600 D）is as high as 91.13%.（2）Under the same process,the breaking strength of three UHMWPE split film fiber ropes with nominal diameter of 14 mm is 118.96 k N,which is far better than that of polyester-acrylic rope（24.68 k N）and PP rope（20.94 k N）of the same specification;Through the test,the regression equations of diameter and breaking strength of ropes with different specifications under the same process are obtained:3 strands:y=7.3253e^0.1225x,8 strands:y=52.959e^0.0424x,12 strands:y=32.718e^0.0938x;At the same time and under the same load,the creep of 3 UHMWPE split film fiber ropes with nominal diameter of 6 mm is 28.82%,which is far lower than that of UHMWPE multifilament ropes（49.93%）and PE ropes（61.36%）of the same specification.With the additional load increasing from 40%to 60%,the creep of UHMWPE split film fiber ropes increases by 29.14%,which is lower than that of PE ropes(0 Under the same load level,the fatigue life of 3 strands of UHMWPE split fiber rope with nominal diameter of 6 mm is 1203 times,which is longer than that of PE rope（26 times）and UHMWPE multifilament rope（1018 times）of the same specification.By fitting the S-N fatigue life curve,it is found that UHMWPE split fiber rope is the most sensitive to stress,and its fatigue resistance is better than PE rope and UHMWPE multifilament rope.Through the friction and wear test,it is found that three UHMWPE split fiber ropes with a nominal diameter of 6 mm under different conditions all maintain a high strength retention rate,especially in the wet environment,under the action of 208 N,the UHMWPE split fiber rope still has a high residual breaking strength of 6644 N,which is higher than the UHMWPE multifilament rope with the same specification（5629 N）.（3）There is little difference in mesh strength and longitudinal breaking strength between UHMWPE multifilament warp knitted net and UHMWPE split film warp knitted net of the same specification;Compared with PE with netted mesh（13955 N）,UHMWPE cracked film with netted mesh（20168 N）has obvious advantages in longitudinal breaking strength.Through the friction and wear test,under different loads,when the friction is 5000 turns,the UHMWPE split film warp knitted mesh and knotted mesh have higher strength retention rate.In addition,with the increase of friction times from 5,000 rpm to 10,000 rpm under the load of 209 N,the strength retention rate of UHMWPE split-film mesh garment is still as high as 83.39%,which is 3.8%lower than before and 9.1%lower than that of UHMWPE multi-screen garment.After the same10,000 revolutions,the strength retention rate of UHMWPE knotted mesh decreased by5.5%,which was lower than that of PE knotted mesh（8.9%）.Comprehensive analysis shows that UHMWPE rope net has high comprehensive performance and good adaptability,such as high wear resistance,fatigue resistance,low creep and superior breaking strength,which provides theoretical and technical support for the development and industrial application of UHMWPE rope net with split film fiber for fishing.