Study On Water Seepage Control Of Paper-based Materials Based On Recycled Plant Fibers

With the acceleration of the process of land desertification control,the demand for land irrigation technology is getting higher and higher.The development of irrigation technology not only saves water resources and manpower and material resources,but also can effectively improve the survival rate of plants.The key to ensuring the survival of plants is to ensure the supply of water for long-term plants.For a long time,the most water-saving irrigation method is pipeline drip irrigation,but it is not suitable in desert areas with vast area and sparse vegetation.It is of great significance to develop a kind of irrigation product with low production cost and no need for recovery.The paper-based permeable material prepared in this paper can provide a solution for the production of this kind of products.Compared with the general fast permeable material,the paper-based permeable material in this paper has the property of slow permeability,and it is different from the waterproof paper that makes the water impenetrable,which is equivalent to a kind of filter material with very slow liquid filtration rate.First of all,according to the performance requirements of paper-based permeable materials,the strengthening effect of wet strength agent on the material was explored.The results show that the physical strength of the material can be effectively ensured when it is in contact with water for a long time by adding 0.5%PAE relative to the absolute dry slurry,and the wet tensile index of the material is 5.64N·m/g.Secondly,the effect of adding auxiliaries in the pulp on the properties of the material was studied.It was found that the fiber could be uniformly hydrophobic when sizing in the AKD pulp.The hydrophobic fiber on the surface and interior of the material provided water barrier properties for the paper-based permeable material.The simulation test results showed that the change of hydrophobicity effectively adjusted the time and rate of water permeation through the material.In the AKD sizing material,the hydrophobicity changed effectively.The time to reach the peak permeability rate can be controlled at 3-6 D,and the peak permeability rate is between 4-18 L/D/m~2.The addition of CPAM enhances the hydrophobicity of the material,adjusts the structure of the permeable channel to make the permeability of the material more stable,and has a longer water supply cycle of 30-80 D in the case of the same amount of water.In order to obtain a wider water supply cycle,TMP pulp with stronger water absorption was prepared in the pulp raw material,and good results were obtained,which further verified the effect of hydrophilicity on the water permeability of the material.Finally,the effect of surface coating on the properties of the material was investigated.The corresponding coating solution was obtained by solution blending of PLA with PCL,ATBC and PBA plasticizers,which was attached to the surface of cardboard substrate byspraying,and the polymer coating endowed the material with different surface properties.In the test of mechanical properties,it is found that the existence of the coating enhances the mechanical properties of the material to a greater extent.The dense surface coating closed part of the permeable channel of the material and reduces the effective permeable area.The average pore diameter of the material coated with 25 g/m~2PLA/PLA was reduced to 1.25μm,and the water absorption of 45min is reduced to 101.3 g/m~2.The water permeability simulation tests of three kinds of coated composites were carried out,and the water supply periods of PLA/PCL coated paper-based permeable materials,PLA/ATBC-coated paper-based permeable materials and PLA/PBA-coated paper-based permeable materials were 7-45 days,3-15 days and 2-10 days respectively.