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正本刊讯贵州赤天化集团助剂的质量分数分别为70%、纸业股份有限公司汪义华等人25%、5%。通过测试,竹塑复合利用竹子制浆备料废弃物竹材料的线膨胀率和线收缩率大屑与高密度聚乙烯(HDPE)生小的变化规律均为厚度方向产竹塑复合材料,竹屑、塑料、宽度方向长度方向,产品其 相似文献
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一项以竹材加工剩余物、小径竹爆破纤维为增强材料,以尼龙、聚丙烯等为基体的竹塑复合材料研制成功。该项目“竹塑复合材料研究与开发”由福建农林大学承担,是与福州聚德塑料有限公司合作完成的。项目研究开发了适合于竹纤维增强塑料的相容剂和喂料设备,并采用注塑、热压成型制造高纤维含量复合板材、异型材系列产品, 相似文献
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竹粉/高密度聚乙烯(HDPE)复合材料的热压工艺研究 总被引:3,自引:1,他引:2
以马来酸酐接枝聚乙烯(MAPE)为相容剂,改善竹粉与高密度聚乙烯(HDPE)的界面相容性,再用热压工艺制备竹塑复合材料.试验结果表明:相容剂用量对板材力学性能影响最为显著,相容剂用量增加到6%时,复合材料弯曲强度、拉伸强度和冲击强度分别增加了66.17%、72.04%和63.73%,吸水厚度膨胀率下降了36.19%,各项性能达到最优.综合生产成本、效率和节能等因素,确定最优工艺参数为竹塑配比7:3、相容剂用量6%、热压温度180℃、热压时间8min 相似文献
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采用蒸汽爆破法对制浆备料工段的竹屑进行预处理,探究其对竹屑水解糖化的影响,并对蒸汽爆破前后竹屑的色度、结构及组分进行对比分析。结果表明:最佳工艺条件为竹屑原料含水率55%、爆破压力2.5 MPa、维压时间180 s,在该条件下还原糖含量为12.50%,较未预处理竹屑提高了61.08%;纤维素含量提高了13.98%,且60.63%的半纤维素被保留下来;蒸汽爆破使得竹屑变得蓬松且颜色由黄棕色转为黄褐色,纤维表面出现撕裂现象;纤维主体结构没有改变,纤维素、半纤维素及酸不溶木素的部分结构被破坏,竹屑物料相对结晶度由49.46%增加到55.93%。 相似文献
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本文的主要目的是研究利用不同类型的皮革废弃物制备有用的材料。在450和600℃的N2气氛中,将三种不同类型的制革废弃物(铬鞣革屑、植鞣革屑和磨革灰)在固定床反应器中进行热解处理。通过热解,得到了气体、油、碳酸铵和含碳残留物。本文研究了温度和皮革废弃物类型对热解产物分布的影响。磨革灰的油产率最高(ca.23%),而其它的废弃物只有ca.9%。元素分析和柱层析的结果表明,热解油经过重新处理后,可作为燃料或化工原料。含碳残留物(焦碳)的产率在37.5%到48.5%之间,它们的卡路里值在4300到6000kcal·kg^-1之间,适合用作固体燃料。此外,本文用CO2对焦炭进行活化,制备出了活性炭。由铬鞣革屑制备的活性炭,其表面积最大(799.5m^2·g^-1)它可以作为吸附剂来吸附水溶液中的染料。 相似文献
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以竹屑为原料,利用响应面法对竹屑多糖的提取工艺条件进行优化。在单因素试验的基础上,选取提取温度、提取时间、液料比为影响因子,以多糖得率为响应值,根据Box-Behnken中心组合试验设计原理,采用三因素三水平的响应面分析法,建立二次回归模型,研究各变量交互作用及其对竹屑多糖得率的影响。结果表明,通过方差分析可知各因素对竹屑多糖提取率影响的大小依次为提取温度、时间、料液比。竹屑提取多糖的最佳工艺条件为:浸提温度78℃、浸提时间21 min、料液比1∶16(g/m L),在此条件下竹屑多糖提取率可达3.180 9%,与模型预测值3.181 2%高度相符。 相似文献
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竹片在1/4″筛上筛选后被分离出的细针状物叫做竹屑。它含有90%的好纤维。对造纸来说这种纤维大大优于由锯木屑所回收的纤维。按平均数计算,一竹浆厂的切竹机间所分离出的竹屑量为已切竹片风干重的2—5%。因为竹屑漂白浆的得率为35—37%,故如将其回收用作制可漂浆,能增加总浆得率1—2%。制浆厂纤维损失的另一个根源为由蒸煮器喷放出的浆料中所分感出来除节机的筛渣。除节机筛渣的数量随蒸煮所使用竹片的大小变化较大。在日产100吨纸张的综合制浆造纸厂,除节机筛渣可能有一至若干吨。在生产较硬浆以增加得率的现代趋势下,一些制浆厂注意了由除 相似文献
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对竹/棉混纺织物的冷轧堆前处理和冷轧堆染色工艺进行了探讨,用中心旋转法设计试验,并用数理统计法优化工艺条件,加工产品质量良好。其前处理工艺为:NaOH30-40g/L,100%H2O2 10—14g/L,稳定剂DF-713-6g/L,精练剂DF-618g/L,渗透剂JFC2g/L,温度30℃,时间20h;染色工艺为:水玻璃60-70g/L,NaOH4-6g/L,时间8-10h。 相似文献
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文章从竹纤维、羊毛、羊绒的风格特点出发,确定合理的混纺比和纱线支数,选择适宜的活性染料和酸性染料,优选工艺参数,制定出切实可行的竹纤维/羊毛/羊绒混纺织物(爽竹呢)的纺纱、织造和染整工艺.实践表明,该工艺能生产高档服装面料,产品的服用性能优异. 相似文献
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The linear vibration–friction welding offers several advantages compared to traditional mechanical fasteners or gluing. This study examines the possibility of applying mechanically-induced vibration welding to the joining procedure of a wood–bamboo sandwich-laminated composite. The result shows that average tensile strength values of the composites can meet the requirements of the furniture industry and even for wood construction. The X-ray microdensitometry analyses indicated an increase in density of the interfacial material between the wood substrate and the bamboo substrate. Furthermore the peak of the density profile between wood and bamboo outer layer is lower than that between wood and bamboo inner layer. This paper proves that the sandwich wood–bamboo welding lumber can be efficiently fabricated by linear vibration welding without any adhesive. 相似文献
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F Welle 《Food Additives & Contaminants》2005,22(10):999-1011
Six hundred conventional recycled HDPE flake samples, which were recollected and sorted in the UK, were screened for post-consumer contamination levels. Each analysed sample consisted of 40-50 individual flakes so that the amount of analysed individual containers was in the range 24,000-30,000 post-consumer milk bottles. Predominant contaminants in hot-washed flake samples were unsaturated oligomers, which can be also be found in virgin high-density polyethylene (HDPE) pellet samples used for milk bottle production. In addition, the flavour compound limonene, the degradation product of antioxidant additives di-tert-butylphenol and low amounts of saturated oligomers were found in higher concentrations in the post-consumer samples in comparison with virgin HDPE. However, the overall concentrations in post-consumer recycled samples were similar to or lower than concentration ranges in comparison with virgin HDPE. Contamination with other HDPE untypical compounds was rare and was in most cases related to non-milk bottles, which are <2.1% of the input material of the recycling process. The maximum concentration found in one sample of 1 g was estimated as 130 mg kg(-1), which corresponds to a contamination of 5200-6500 mg kg(-1) in the individual bottle. The recycling process investigated was based on an efficient sorting process, a hot-washing of the ground bottles, and a further deep-cleaning of the flakes with high temperatures and vacuum. Based on the fact that the contamination levels of post-consumer flake samples are similar to virgin HDPE and on the high cleaning efficiency of the super-clean recycling process especially for highly volatile compounds, the recycling process investigated is suitable for recycled post-consumer HDPE bottles for direct food-contact applications. However, hand-picking after automatically sorting is recommended to decrease the amount of non-milk bottles. The conclusions for suitability are valid, provided that the migration testing of recyclate contains milk bottles up to 100% and that both shelf-life testing and sensorial testing of the products are successful, which are topics of further investigations. 相似文献