| As the society develops quickly, all kinds of electronic equipments especially computers are used widely,which makes electromagnetic radiation become one of the biggest pollution besides air pollution,water pollution and noise pollution. Electromagnetic radiation affects the health of people,so several measures of protection in need emerge of which anti-EMI fabric is not only effectual but also inexpensive,it can be made into anti-EMI garments,wall poster and covers etc.Recently, spunlaced nonwoven fabric has being developed quickly due to high yield,clean and low energy consumption, will be prospective to study on coating process on spunlaced nonwoven fabric with electric conducting and anti-electromagnetic radiation properties.In view of the above, the paper uses spunlaced nonwoven fabric as the substrate and produces coated fabric by directly knifing self-made coatings. Studying on coating fomula and process through some morden technologies like SEM,EDS and laser particle analyzer etc. improving the quality by Box-Behnken optimization designing test.On the base make a primary comparative between the properties of coated spunlaced nonwoven fabric and woven fabric.The main research conclusions including:1. Adding 0.2%-0.3% silane coupling agent directly into the dope will slow the oxidation rate of copper. When copper is filler,the best dispersant used in acrylic resin is nonionic.2. Compare the electric conductivity of coated fabrics with different kind of copper as fillers of which one group is schistic copper with diameter at lOμm and 40μm,another is schistic and arborescent copper with the same diameter at 40μm.It shows that the electric conductivity of schistic copper is better than arborescent copper while 10μm better than 40μm.3. It shows that when copper is used as fillers,the best process is continuously knifing on the fabric twice when copper content is at 55%-60%, solidified at 120℃about 10 minutes while when graphite is used as fillers,the best process is continuously knifing on the fabric twice when graphite content is at 30%-35%, solidified at 120℃about 30 minutes.4. It shows that the optimal proportion of copper and graphite is 50:50 when the quality persentage of copper and graphite is 40%, continuously knifing on the fabric twice then solidified at 120℃about 20 minutes,which will make the resistant the least while SE the biggest.When the proportion of copper and graphite less than 50:50,it is difficult to disperse because the grain diameter of graphite is too small to process while lacking of resin to covering every fillers,making fillers easy to drop off coated fabric.5. Analyze the significance of each factor on surface resistance and SE by Box-Behnken experiment designing to calculate the Sequential Model of surface resistance and SE.It is proved of high reliability by analyzing the small variance.6. Analyzing and ranking the three single factors according to the impact significance on surface resistance is:graphite content V> solide time t> solide temperature T; Analyzing and ranking the three single factors according to the impact significance on SE is:solide time t >solide temperature T>graphite contentⅤ.7. With copper powder and graphite compound conductive coating, continuously knifing on the fabric twice then solidified at 120℃about 20 minutes.Comparativly analyze the properties of coated spunlaced nonwoven and woven fabrics.It is shown that after coating spunlaced nonwoven fabric shows a good wear resistance and better electric conductivity and electromagnetic shielding property;after coating both air permeability and blend resistance of these two fabrics decline while spunlaced nonwoven fabric is more starched,;the tensile strength at break increases a lot while the breaking elongation decline to some extent of which spunlaced nonwoven fabric changes more;the adhesion strength of coating on both fabrics appear pretty much the same. Coated spunlaced nonwoven fabric is better to be made into electric conducting and anti-electromagnetic radiation wall cover.
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