Preparation Of Super-Hydrophobic Wear-Resistant Cotton Fabric Via Self-Assembly With Borate Covalent Bond Driving Force

Recently,functional textiles with waterproof properties have attracted more and more attention from researchers,and consumers have begun to favor such products.There are many methods for preparing superhydrophobic functional textiles,for example,sol-gel method,water thermal method,vapor deposition method,template method and electrospinning method,as well as finishing of fluorine-containing substances,etc.Considering the high cost of these methods,cumbersome procedures,severe experimental conditions and potential hazards,so this article chooses from assembly method to prepare super-hydrophobic functional cotton fabric.Studies have shown that the preparation of superhydrophobic functional cotton fabrics by self-assembly method is simple,quick and easy to control.The driving force of the self-assembly process is divided into two types: covalent bond and non-covalent bond.Phenylboronic acid has been found to be able to interact with 1,2-or 1,3-diol compounds have received widespread attention since they formed dynamic borate covalent bonds with controllable p H.Researchers often compound compounds containing phenylboronic acid functional groups with other materials to give new materials more excellent properties.Based on the excellent performance of phenylboronic acid,this paper conducts self-assembly research on the surface of cotton fabric,supplemented by modification with low surface energy substances,and finally successfully prepares a super-hydrophobic wear-resistant cotton fabric.The specific research content is divided into the following three parts:(1)Use water-soluble coupling reagents EDC and NHS to prepare palm wax microspheres(PW-PBA)containing phenylboronic acid functional group through amidation reaction,and covalently use the borate formed between phenylboronic acid and polyvinyl alcohol(PVA).The bond is the driving force.The palm wax microspheres containing phenylboronic acid functional groups are self-assembled on the surface of cotton fabrics to prepare cotton fabrics with PVA/PW-PBA self-assembly system.At the same time,the influence of p H on the self-assembly process is explored.The results show that the self-assembly process is controlled by p H,and the self-assembly process can proceed smoothly only when the p H value is ? 9.Under the best treatment conditions(p H=9),the water vapor transmission rate of the PVA/PW-PBA self-assembly system cotton fabric after the hot melt treatment is 32% lower than that of the raw cotton fabric,the air permeability is lowered by 8.6%,and the breaking strength increased by 13.9%,elongation at break increased by 8.4%.Regardless of hot melt treatment or not,the prepared cotton fabric of the PVA/PW-PBA self-assembly system only achieves the hydrophobic effect.Only when the prepared cotton fabric is hot melted and modified with low surface energy can it achieve the super-hydrophobic effect,and the contact angle is up to 152°.(2)Using the borate covalent bond formed by phenylboronic acid and PVA as the driving force for self-assembly,grafted modified palm wax microspheres(PW-PBA),rosin resin(RW-PBA),and oxidized polyethylene wax microspheres(OW-PBA)under the condition of p H 9 treatment,it self-assembled on the cotton fabric treated with PVA solution to obtain the ternary self-assembly system cotton fabric.Test a series of properties of the ternary self-assembly system cotton fabric and explore the p H the influence of the value on the self-assembly process.The results show that the p H value is the switch of the self-assembly process,and the self-assembly adsorption process can proceed smoothly only when p H?9.The ternary self-assembly system cotton fabric has a significant water repellent effect,with a contact angle of 148°.After the ternary self-assembly system cotton fabric is heat-melted,the contact angle reaches 153°,achieving a super-hydrophobic effect.After the ternary self-assembly system modifies the cotton fabric,its mechanical properties are significantly improved,the air permeability is maintained well,but the friction resistance is poor.The physical and mechanical properties of the ternary self-assembly system cotton fabric before and after the heat-melt treatment did not change much.(3)Taking into account the poor friction resistance of the ternary self-assembly system cotton fabric,it cannot meet the requirements required for wear.Therefore,the titanium boride-based silicone resin system is further used to finish the ternary self-assembly system cotton fabric through the solution dipping method,and the preparation does not require hot-melt treatment can achieve super-hydrophobic and abrasion-resistant cotton fabric.The results showed that the contact angle of the ternary self-assembled cotton fabric after finishing with titanium boride-based silicone resin system reached 155°,and the contact angle remained above 150° after 3000 rubbings.The titanium boride-based silicone resin system not only effectively improves the hydrophobic properties of the ternary self-assembly system cotton fabric,but also gives it excellent friction resistance.In addition,studies have shown that the thermal stability of the finished ternary self-assembly system cotton fabric is significantly improved and maintains better physical and mechanical properties.