The Preparation And Performance Of Tent Coated Cotton Fabric

Coated fabrics are widely used in civil, industrial and agricultural, health and military fields. The demand to these materials such as the outdoor sportswear, military medical protective clothing, tent fabric, building materials of membrane structures, decorative materials of automobile, airbags and other high-tech textile after coating is increasing. Tent fabric is the largest species of coated fabric used in industrial consumption. Coated fabrics used for tent materials have been long history. The early products are temporary or seasonal a simple structure. With the continuous advancement of technology, people need the tent fabric with higher function. The requirements have not only waterproof, ultraviolet resistant, but also have good moisture permeability. The new tent fabrics are emerging, the fiber, fabric structure and finishing technology have updated and the transition tent fabrics have developed towards a new generation of technology.In this paper, a tent fabric has designed. Today the development of tourism has brought with tourism development in the textile, tourism tent sales growth. Another military tent used for national defense and armed forces is a major textile product. With the development of the national economy is expected to the amount of tent fabric growth. The production of tents fabric has gradually transfered from the United States, Europe, Korea to the China's coastal areas, but the domestic fabrics and finishing the overall level is not high, therefore, actively using new materials, new technologies, improve product processing technology , To produce the tent fabrics with best use of the new requirements and high value-added products is our a task. The tent fabrics request the easy-to-carry portable, the other from the comfort features. it must have also a better ability to waterproof and moisture permeable, so that, in order to achieve the comfort of a light-type tent fabric performance requirements, the thin-and-light cotton fabric was used in this design. At the same time, due to the tent fabric in using is a state of covering or a state of suspension, it is necessary to bear metal stents, such as rope tension, the fabric must be more powerful, especially for higher tear strength. Therefore, it must be attention and improvement that the tearing strength of cotton fabric after coating will decline. For this reason, the papers were made in the following areas.First of all, the cotton fabric was finished as water repellent and ultraviolet resistant. Through the use of several different water repellent finish on the fabric, the choice of finishing agent concentration, crosslinker concentration, the catalyst concentration, curing temperature and curing time, and several other major factors affecting the application of orthogonal experimental methods were considered to get the best effects water repellent, and test the finished fabric's water repellent levels, hydrostatic pressure, and other indicators, the variance analysis of test results, that the best technical parameters and technological conditions, and to select Fluorine Nuva TP as the water repellent agent of this fabric.The ultraviolet resistant on cotton fabric after water repellent finish was made with titanium dioxide sol preparated by ourselves and the best line of technology of preparating titanium dioxide was studied. The titanium dioxide finished cotton fabric has a good effect of ultraviolet resistant. The multi-functional finishing line of cotton tent fabric: first water repellent finish to cotton fabric with Nuva TP water repellent finish agent, and then TiO₂ Sol on the cotton fabrics for ultraviolet finishing. After multi-functional finishing, the hydrostatic pressure to reach 2239 (Pa), UV (300nm) to reach 3.7 percent of fabric.The cotton fabrics after water repellent and ultraviolet resistant finish were used for dry and wet coating, through the determination of different coating process on the cotton fabric hydrostatic pressure and water vapor permeability of the impact of its best coating and DMF content in coating agents of the main factors. The fabric's tearing strength after coating finish often have greatly decline and tearing strength of textiles is an important one, especially as the use of the textile industry. Therefore, improving coated fabric's tearing strength is that manufacturers need to solve the problem. Analysis of the reasons of the fabric's tearing strength will be decline after coating found, as the fabric after coating, the coating agent to infiltrate into the internal of fiber and yarn, and filled with the gap of fiber and yarn. Drying fabric, yarn and fabric become more rigid and elastic modulus of fabric become greater than before. Blocking of yarn in the fabric led to increasing friction between the yarn and the slip between the yarn become difficult, So the fabric's tearing strength decline. The moer of finishing agent infiltrated into fabric coating, the more of the tearing strength decline. This phenomenon is more obvious with the hard coating agent of high modulus of elasticity . Therefore, adding the softener agent to the coating agent to reduce the modulus of elasticity of coated fabric and improve tear strength of the coated fabric. Because the softener agent will reduce the friction between the fiber and yarn and increase mobility, so that the tear strength to a certain degree of improvement. In this paper amino polysilicone as a softener agent was added to polyurethane coating agent of to improve the fabrics tear strength. amino polysilicone is a elastomer, with high flexibility, Adding amino polysilicone to polyurethane coating agent can improve the fabrics tear strength. The best mixing ratio of amino polysilicone and polyurethane was identified through a lot of experiment.The cotton fabrics through multi-functional finishing used in polyurethane mixes amino-silicone coating for direct wet, and its coating capacity of 46.69g/m2, DMF content of 10%, poly-silicone content of 10%, baking temperature and time for the 180°C x 2min. Hydrostatic pressure to be to 7038 (Pa), water vapor permeability for 3863 (g/m2 ? 24h), after the warp-wise tear strength for the 37.33 (N) and the filling-wise tear strength for the 30.64 (N) of the tent fabric.The mechanical models of fabrics tear strength were established in the micro-structure such as: yarn strength, elongation at break, thread count, etc. These mechanical analytical methods are not suitable for coated fabrics due to the infiltration into yarns of coating agent. This paper will be coated fabric as the overall composite material, made to the basis of elasticity, consider fabrics modulus, poisson's ratio, shear modulus of the powerful impact of torn fabric, analysis and simulation to the tear progress of coated fabric using finite element method, in order to more accurately characterized tear process of coated fabrics, to provide the further way of analysis tear mechanism coated fabrics. In this paper, there are three main the innovative points. Partâ… : by comparison and choice of the water repellent finish agent, self-made TiO₂ Sol, using Nuva TP and TiO₂ Sol made multi-functional finishing of water repellent and anti-ultraviolet finishing to cotton fabric, the fabric after finishing of the best technical parameters with a better water repellent function and anti-ultraviolet function, the actual production would be a valuable reference and guide. Partâ…¡: cotton fabric by the polyurethane coating after finishing with a good waterproof and moisture permeability, but the tearing strength decline very strong. We have put forward in the polyurethane coating agent to add amino silicone to improve the decline of the tear strength, and discussed the process line and parameters of mixing coating agent. The coated fabric with add the amino silicone to polyurethane not only maintain a good waterproof and moisture permeability, but also tear strength increase by nearly 40%. Partâ…¢: The mechanical models of fabrics tear strength were established in the micro-structure such as: yarn strength, elongation at break, thread count, etc. These mechanical analytical methods are not suitable for coated fabrics due to the infiltration into yarns of coating agent. This paper will be coated fabric as the overall composite material, made to the basis of elasticity, analysis and simulation to the tear progress of coated fabric using finite element method, the relations between the stress distribution and size of the trapezoid tear specimen with the material elastic constants can be get.