摘要
In this paper, scrap rubber powder(SRP), azodicarbonamide(ADC) as foaming agent and double-component epoxy resins(ER) as binder were used to prepare porous sound-absorbing material of rubber foam composite(RFC) by hot-pressing process. Response surface methodology(RSM) was employed to evaluate three process variables, i e, specimen thickness(A), ADC dosage(B) and foaming temperature(C), and to establish two polynomial function model equation between sound absorption coefficient(α) and three process factors(A, B, C) at middle and low frequency 250 Hz, 500 Hz, 800 Hz, 1 000 Hz to determine the optimal preparation condition of RFC. The statistical analysis of results demonstrated that specimen thickness(A) exerted significant impact on sound absorption properties of RFC. And the optimum prepared condition of RFC was 10 mm specimen thickness, 3.00 g ADC dosage, and approximately 196 ℃ foaming temperature. Under optimal condition, sound absorption coefficient of RFC could reach 5.68%(250 Hz), 7.67%(500 Hz), 20.73%(800 Hz), 18.71%(1 000 Hz), coinciding with the predicted values 5.70%(250 Hz), 7.69%(500 Hz), 20.77%(800 Hz), 18.74%(1 000 Hz) from the predicted polynomial function model, which exhibited that RSM could be used to optimize the preparation process of sound-absorbing materials.
In this paper, scrap rubber powder(SRP), azodicarbonamide(ADC) as foaming agent and double-component epoxy resins(ER) as binder were used to prepare porous sound-absorbing material of rubber foam composite(RFC) by hot-pressing process. Response surface methodology(RSM) was employed to evaluate three process variables, i e, specimen thickness(A), ADC dosage(B) and foaming temperature(C), and to establish two polynomial function model equation between sound absorption coefficient(α) and three process factors(A, B, C) at middle and low frequency 250 Hz, 500 Hz, 800 Hz, 1 000 Hz to determine the optimal preparation condition of RFC. The statistical analysis of results demonstrated that specimen thickness(A) exerted significant impact on sound absorption properties of RFC. And the optimum prepared condition of RFC was 10 mm specimen thickness, 3.00 g ADC dosage, and approximately 196 ℃ foaming temperature. Under optimal condition, sound absorption coefficient of RFC could reach 5.68%(250 Hz), 7.67%(500 Hz), 20.73%(800 Hz), 18.71%(1 000 Hz), coinciding with the predicted values 5.70%(250 Hz), 7.69%(500 Hz), 20.77%(800 Hz), 18.74%(1 000 Hz) from the predicted polynomial function model, which exhibited that RSM could be used to optimize the preparation process of sound-absorbing materials.
作者
ZHANG Xiangfeng
ZHANG Jia
CHENG Ziqiao
张相锋;ZHANG Jia;CHENG Ziqiao(School of Environment,Beijing Normal University,Beijing 100875,China;China Environmental Resources Technology Co.,Ltd.Henan Branch,Zhengzhou 450046,China;Beijing Zhongjiao Hongyi Environmental Protection Engineering Co.Ltd.,Beijing 101405,China;Zhengzhou Hongyi Environmental Detection Technology Co.Ltd.,Zhengzhou 450046,China;Power China Road Bridge Group Co.,Ltd,Beijing 100048,China)
基金
Funded by the National Science&Technology Pillar Program during the Twelfth Five-year Plan Period(2012BAC01802)
Power China Road Bridge Group Co.,Ltd
作者简介
ZHANG Xiangfeng(张相锋):Ph D,Lecturer,E-mail:bnuhyky@163.com。
