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The Study on the Sol-gel Technology and Its Application on Electromagnetic Shielding Fabrics

Author: ZhangLin
Tutor: WangZuo
School: Donghua University
Course: Textile Chemistry and Dyeing and Finishing Engineering
Keywords: Sol - gel method . Activation method Electromagnetic shielding Nylon Electroless plating
CLC: TS195.5
Type: Master's thesis
Year: 2010
Downloads: 142
Quote: 0
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Abstract


In this thesis, the electroless plating pretreatment method based on the sol - gel technology, textile surface to the formation of the catalytic activity of electroless plating layer triggering electroless nickel plating. This activation method improved the traditional \having excellent electromagnetic shielding function textiles with high binding fastness chemical nickel plating. Therefore, the pre-treatment process has prominent advantages and broad application prospects. Polyamide (Polyamide) fabric substrate, the first in the fabric surface to form a layer of APTES sol processing into with electron-rich group of gel, and then through the the impregnated palladium salt activation solution ligand complex merger adsorption reduction The palladium membrane having a high catalytic activity. By orthogonal experiments and single-factor experiment discussed the optimum conditions of the process prescription palladium salt solution, and analyze the impact of various factors on the activation process. Fabric resistance value using electroless nickel / phosphorus electroless plating fabric before and after weight gain as effect of activation criteria to obtain the best conditions for the activation process: APTES concentration of 2%, the ethanol concentration of 28.6%, acetic acid concentration of 0.714% sol finishing time 30min; activated optimum conditions: palladium chloride concentration of 40 mg / L, the processing temperature of 25 ° C, the processing time of 30min-40min. Turn attempt to polyamide fabric as the substrate, the first use of β-cyclodextrin (β-CD) having a larger molecular volume and a hydroxyl group distribution of the structural features and metallic palladium ligand complex formed supported complexation catalysts, followed by the sol - gel technology will have a \The higher catalytic activity. By orthogonal experiments and single factor experiments discussed in the carrier layer formation conditions and the best ratio of palladium activation solution, analysis of the impact of various factors on the activation process. Using the value of the resistance of the fabric after the electroless nickel plating as a judgment basis for activating effect to give the optimum conditions for the carrier layer of the fabric formed: GPTMS concentration of 18g / L, TEOS concentration of 20 g / L, 3.6% of ammonia concentration, the concentration of ethanol 26.7%, and the processing time of 30 min; optimum conditions for activation: palladium chloride concentration of 45 mg / L, the processing temperature of 25 ° C, the processing time of 30min ~~ 40min. XRD, SPM, SEM, UV-Vis and other methods were characterized by the the best activation process conditions processing from the catalytic film. XRD patterns of the substrate after activation palladium activation layer is formed on the surface of the fabric; using SPM observed film surface palladium grain morphology and particle size, SEM and microscopic images observed can corroborate this conclusion; by UV - visible spectroscopy (UV-Vis), palladium-β-cyclodextrin (Pd-β-CD) complexation. Mechanical properties of the fabric in the electroless nickel plating, ultraviolet resistance, corrosion resistance, electrical conductivity stability, thermal stability, abrasion resistance and metal plating combined fastness test results show that the, activation method sol - gel processing electromagnetic shielding material obtained after the mechanical properties will not be severely affected the stability of the various aspects of preferably exhibit good electromagnetic shielding, electrical conductivity, and ultraviolet resistance, and fastness of the coating and the substrate has a good combination.

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Dyeing and finishing industry > Finishing > Chemical finishing
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