Super Water Repellent, Anti-uv Function Fabric

This thesis is that the fabrics are researched of having super hydrophobic function and ultraviolet resistant function, including two major parts: a part is the research of ultraviolet resistant performance of fabrics; another part is the research of super hydrophobic performance of fabrics.First, the orthogonal experiment is used to study the influencing factors of fabric to resist to ultraviolet systematically and qualitatively. On the basis of comprehensive considering 3 targets of ultraviolet transmissibility, moisture permeability content, air permeability content, through analyzing the influencing factors of fabric to resist to ultraviolet, one kind of method can be obtained to cause the ultraviolet resistant performance of fabric through the change of structural parameters of fabric to be able to be improved, simultaneously moisture permeability and air permeability of fabrics also better. The influencing factors of fabric to resist to ultraviolet are divided into the direct influencing factors (fiber type, yarn linear density, textile weave, fabric density) and the indirect influencing factors (cover factor, thickness, weight) .The results indicated that, cover factor is the most main indirect influencing factor, when cover factor increases, ultraviolet transmissibility, moisture permeability content and air permeability content all reduce.Next, in order to obtain the fabric of having super hydrophobic surface, the method is used that the superficial structure of lotus leaf is imitated, one is to imitate the tower of micron structure of lotus leaf, and two is to imitate the nanometer structure of lotus leaf. The imitation of micron structure of lotus leaf includes choices of fiber fineness and textile weave. The polyester superfine sea-island fiber is selected to imitate tower diameter that the linear density is 160dtex/48f, and the fiber diameter is 2.87μm which is smaller than the average diameter 5 ～ 9 μm of tower of lotus leaf, thus roughness of per unit area of fabric woven from it to be bigger, and the super hydrophobicity to be better, meeting the needs of the imitating diameter of tower of lotus leaf. Another method is applied to imitate tower altitude that crepe weave and the high-shrinkage polyester filament are used in the fabric. After opening filament process, the waviness height of yarn and roughness of fabric are all increased, strengthened the dimple effect, so the super hydrophobicity is enhanced.The finished cover factors of fabrics are chosen to 66% and 53%, of which ultraviolet resistant performances are extremely good, and the moisture permeabilityor air permeability accords with the requirement, moreover have basically hydrophobicity. After the fiber fineness, textile weave and cover factor have been determined, the structural parameters of fabrics are determined. The corresponding fabrics are possible to be woven according to these parameters that will become the base cloths to load nanometer particles.When the nanometer structure of lotus leaf is imitated with nanometer titanium dioxide (TiO₂) and nanometer nickel oxide (NiO), it is the main problem to be solved that the better dispersibility of nanometer particle will be got. In this paper, the compound dispersing agent is selected to enhance its dispersible effect, because the distribution of particle diameter is ideal insufficiently with the sole dispersing agent. In the experiment of dispersing nanometer titanium dioxide, the compound dispersing agent is determined for the lauryl sodium + polyacrylic ammonium, when the proportion of lauryl sodium and polyacrylic ammonium is 1:1 and the supersonic time is 10min, the dispersible effect is quite ideal. In the experiment of dispersing nanometer nickel oxide, the compound dispersing agent is determined for the lignosulphonate sodium + polyacrylic ammonium, when the proportion of lignosulphonate sodium and polyacrylic ammonium is 1:1, the dispersible effect is quite ideal.According to the above findings, the dispersed nanometer particles are loaded on the designed base cloths, thus the fabrics will be made up which have super hydrophobic function and ultraviolet resistant function. The developed fabrics have satisfying super hydrophobicity, the extremely outstanding ultraviolet resistant performance, basic moisture permeability and air permeability, better drape and wrinkle resistance, but luster are not very good.