【作者】 韩淑伟；

【导师】 孙照斌； 马长明；

【作者基本信息】 河北农业大学 ， 森林培育， 2010， 硕士

【摘要】 本文主要研究了废弃MDF纤维再生制造各类人造板工艺,主要包括预处理方式对废弃MDF化学特性的影响、废弃MDF纤维再生制造纤维板工艺、废弃MDF纤维/水泥水化特性与废弃MDF纤维/水泥板工艺、废弃MDF纤维/石膏水化特性与废弃MDF纤维/石膏板工艺研究。实验结果如下:(1)预处理对废弃MDF纤维性能有显著的影响,测定预处理后废弃MDF纤维的pH值、缓冲容量、胶固化时间,综合各因素结果表明:在冷水处理、热水处理、1%NaOH处理三种处理方式中,以热水处理最有利于UF胶的固化。(2)废弃MDF纤维再生制板工艺试验较优的工艺参数为:长短纤维混合,密度0.65 g/cm3,施胶量15%,温度120℃,时间5min,单位压力3.0 Mpa,所制再生纤维板MOR为22.53Mpa、MOE为2426.89 Mpa、IB为0.85Mpa、24hTS8.19%,均达GB/T11718-1999中密度纤维板国家标准。(3)废弃MDF纤维-水泥水化特性试验结果表明:化学助剂CaCl2能明显地改善水泥的水化特性和提高混合物最高水化温度,CaCl2的添加量以水泥重量的3%最为合适;废弃MDF纤维水泥制板工艺实验得出纤维水泥板最优工艺参数为:密度1.2g/cm3,纤灰比0.2,水灰比0.4,氯化钙为水泥用量的3%,单位压力2.5Mpa所制水泥纤维板MOR为11.57Mpa,浸水24hMOR为9.34 Mpa,MOE为3172.90 Mpa,24h吸水厚度膨胀率为0.95%,均可达JC/T411-2007水泥木屑板国家标准。(4)废弃MDF纤维-石膏水化特性试验结果表明:添加柠檬酸对石膏水化有明显的缓凝作用,其添加量为石膏用量的0.01%较好;在冷水处理、热水处理、1%NaOH处理三种处理方式中,以热水处理过的废弃MDF纤维-石膏水化特征曲线最接近于纯石膏的水化特征曲线;废弃MDF纤维石膏制板工艺试验得出石膏纤维板最优工艺参数为:密度1.3g/cm3,纤膏比比0.20,水膏比0.35,柠檬酸的用量为石膏用量的0.01%,单位压力为3.0Mpa时,所制石膏纤维板MOR为5.92Mpa,MOE为2420.37 Mpa,IB为0.37 Mpa,24hTS为1.21%,均达LY/T1598-2002石膏刨花板国家林业标准。更多还原

【Abstract】 The technique of various wood-based panels from waste MDF fiber was studied in this paper,which include the effect of pretretment for chemical charateristics of waste fiber MDF, the technique of fiberboards from waste fiber MDF, hydration of waste MDF fiber / cement and the technique of cement-fiber boards from waste fiber MDF(the technique of cement-waste MDF fiber boards), hydration of waste MDF fiber /gypsum and the technique of gypsum-fiber boards from waste fiber MDF(the technique of gypsum-waste MDF fiber boards). The results are as follows:(1)Pretreatment had significant impact for the waste MDF fibers.Measuring the pH, buffer capacity, UF curing time of waste fiber MDF after pretreatment,the results show that: Hot water is better,in the pretreatment of cold water, hot waterand 1% NaOH.(2)The technique of fiberboards from waste fiber MDF, the optimal process parameters: the mix fiber of length and short,density 0.65g/cm3, glue content of 15%, pressing temperature of 120℃,pressing time of 5min,and unit pressure is 3.0 Mpa.The performance of fiberboards were reached the national standard of MDF fiberboards GB/T11718-1999:MOR is 22.53Mpa,MOE is 2426.89 Mpa, IB is 0.85Mpa and 24hTS is8.19%.(3)Hydration test of waste MDF fiber-cement, results show that: chemical additives of CaC12 could largely improve the compatibility of cement and improve the maximum hydration temperature of mixture(waste MDF fiber-cement), addition 3% of CaCl2 by weight of cement is most appropriate; the optimal process parameters from the technique of cement-fiber board were that: density is 1.2g/cm3,fiber/cement ratio is 0.2,water/cement ratio is 0.4, CaC12 is 3%( weight of cement) and unit pressure is 2.5 Mpa,were reached the national standard of cement woodboards JC411-2007:MOR is 11.57MPa, soaking 24hMOR is 9.34 Mpa, MOE is 3172.90 Mpa, 24hTS is 0.95%.(4)Hydration test of waste MDF fiber-gypsum, results show that: Citric acid(CA)has significantly retardation effect for the hydration of gypsun, addition 3% of CaCl2 is better by weight of gypsum; The hydration curve of waste MDF fiber treated by hot water is closest to the hydration curve of pure gypsum,in the pretreatment of cold water, hot water and 1% NaOH; the optimal process parameters from the technique of gypsum-fiber board were that: density is 1.3g/cm3,fiber/ gypsum ratio is 0.2,water/ gypsum ratio is 0.35, CA is 0.01%( weight of gypsum) and unit pressure is 3.0 Mpa,were reached the national standard of LY/T1598-2002:MOR is 5.92MPa, MOE is 2420.37 Mpa,IB is 0.37 Mpa,24hTS is 1.21%.更多还原