期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Selecting the Technology of Sodium Silicate Modified Poplar with the Highest Performance by Fuzzy Orthogonal Method 被引量:1
1
作者 Xiaoqian Bi Pengfei Guan +3 位作者 Ping Li Yuan Zhang Xingong Li Yingfeng Zuo 《Journal of Renewable Materials》 SCIE EI 2023年第5期2399-2415,共17页
Sodium silicate modification can improve the overall performance of wood.The modification process has a great influence on the properties of modified wood.In this study,a new method was introduced to analyze the wood ... Sodium silicate modification can improve the overall performance of wood.The modification process has a great influence on the properties of modified wood.In this study,a new method was introduced to analyze the wood modification process,and the properties of modified wood were studied.Poplar wood was modified with sodium silicate by vacuum-pressure impregnation.After screening using single-factor experiments,an orthogonal experiment was carried out with solution concentration,impregnation time,impregnation pressure,and the cycle times as experimental factors.The modified poplar with the best properties was selected by fuzzy mathematics and characterized by SEM,FT-IR,XRD and TG.The results showed that some lignin and hemicellulose were removed from the wood due to the alkaline action of sodium silicate,and the orderly crystal area of poplar became disorderly,resulting in the reduction of crystallinity of the modified poplar wood.FT-IR analysis showed that sodium silicate was hydrolyzed to form polysilicic acid in wood,and structural analysis revealed the formation of Si-O-Si and Si-O-C,indicating that sodium silicate reacted with fibers on the wood cell wall.TG-DTG curves showed that the final residual mass of modified poplar wood increased from 25%to 67%,and the temperature of the maximum loss rate decreased from 343℃ to 276℃.The heat release and smoke release of modified poplar wood decreased obviously.This kind of material with high strength and fire resistance can be used in the outdoor building and indoor furniture. 展开更多
关键词 Poplar wood sodium silicate impregnation modification fuzzy orthogonal method process optimization flame retardant
下载PDF
Permeability test and fuzzy orthogonal analysis of hydrogenated nitrile O-ring
2
作者 Qin Hu Changcheng Wan Changxin Wang 《Petroleum》 2015年第1期46-50,共5页
In the high temperature,high pressure and high corrosive environment of the oil and gas drilling downhole,the weatherability of rubber sealing material has a great influence on the production safety.In order to study ... In the high temperature,high pressure and high corrosive environment of the oil and gas drilling downhole,the weatherability of rubber sealing material has a great influence on the production safety.In order to study the important degree of every key environmental factor in downhole influencing the sealing performance of rubber sealing material,a new device of simulating downhole environment is designed to test the permeability of O-ring.The sample is hydrogenated nitrile O-ring and orthogonal experiment method is used to do nine tests by getting three levels from temperature,pressure and CO2 volume fraction.Test adopts fuzzy orthogonal method to analyze the main effects and the interaction between two factors,taking tensile strength,diameter variety rate and pH value of indicator as evaluation index.The results show that:the environmental factor influencing the sealing performance of hydrogenated nitrile O-ring from high to low by turns is temperature,pressure and CO2 volume fraction,while the interaction between temperature and pressure is the most significant.It provides a new way to study the influence of downhole complex environment on the performance of rubber sealing material.Moreover,the results have important reference value to further study the failure mechanism of rubber sealing ring in many environmental factors and the rational use in engineering. 展开更多
关键词 Hydrogenated nitrile O-RING PERMEABILITY fuzzy orthogonal Oil and gas exploration
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部