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开发了一种利用餐厨废油脂和氧化钙,在双氧水的催化作用下直接合成金属钙皂的环境友好方法。采用单因素试验优化了皂化温度、皂化时间、物料比、油水比和催化剂用量。结果表明,在最佳工艺条件下,即皂化温度90~95℃、皂化时间4. 0~6. 0 h、催化剂(H_2O_2)用量10 m L(50 g餐厨废油脂)、物料比(餐厨废油脂与氧化钙质量比) 50∶7、油水比(质量比) 1∶4. 5时,皂化率达到95%以上。产品为干燥粒状固体,钙含量为7. 31%,游离酸含量为0. 12%,熔点为131~138℃。 相似文献
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以聚乙烯亚胺(PEI)为高分子骨架,2-(1-蒽醌基氨基)-4,6-二氯-1,3,5-三嗪为染料母体,通过化学接枝,合成了高分子染料,再对聚乙烯亚胺高分子上的氮进行季铵化,得到高分子阳离子活性染料.通过红外光谱表征合成的高分子阳离子活性染料的结构,并在无盐染色工艺条件下对棉织物、羊毛进行浸染,结果显示具有较高的上染百分率和固色率,摩擦牢度较好. 相似文献
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本文合成能与阳离子染料配伍同浴使用的活性染料,并进行了染色试验;合成中采用催化剂N,缩短反应时间,并对其反应机理提出初步看法。 相似文献
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阳离子型柔软剂的合成、性能及应用 总被引:3,自引:0,他引:3
介绍了阳离子柔软剂的分类、品种、简单合成方法及应用,分析了阳离子柔软剂的结构与应用性能及生物降解性的关系,随着复配技术的发展,可制出性能更优,功能更全的柔软剂。 相似文献
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为研究消防员防护服面料的舒适性并考察其是否满足欧美国家相关标准,选取了我国消防员防护服常用的几种面料,进行单层织物热阻和湿阻以及多层织物热阻、湿阻和总热损失的测试与分析,考察空气层对多层织物热阻的影响,并将测试结果与欧美标准的相关要求进行对比。结果表明:在厚度大致相同时,外层面料的密度对热阻和湿阻影响较大;因为隔热层材料是非织造布结构,热阻和湿阻较大;空气层的位置对多层织物的热阻值影响不大,但其厚度对多层织物的热阻影响较大;选取的几种面料组合,湿阻低于30 Pa·m~2/W,总热损失高于205 W/m~2,均满足欧美国家相关标准要求。 相似文献
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为达到女上装的款式实现与工艺效果,运用层次分析法对样衣的静态合体性与动态舒适性进行综合评价。其中,在评价样衣静态合体性时,选择款式风格和前胸、体侧、后背3个部位合体性作为4个评价指标,利用层次分析法得到的指标权重和专家评价结果计算得到静态合体性评价分值;在评价动态舒适性时,选择着装者在常见的11种动作下的舒适度作为评价指标,利用各指标的权重和三角模糊数评分矩阵得到动态舒适性评价分值;最后运用加权平均计算得到最终样衣评价综合值,选出最佳效果样衣;据此有效评价样衣试验效果,确定最佳放松量和工艺设计方案。 相似文献
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Eduardo A S Rosa Paula M F Rodrigues 《Journal of the science of food and agriculture》1998,78(2):208-212
In previous studies it was shown that the concentration of total and individual glucosinolates in brassicaceous plants can vary significantly over a 24-h period grown either in the field or under controlled conditions. The present study shows total and individual glucosinolate variation during a single day. Seedlings of cabbage grown under controlled conditions and at 14 and 15 days after emergence were moved to 20°C (Exp A) and 30°C (Exp B), with a constant photosynthetic photon flux density of 480 μmol m−2 s−1 and 75% relative humidity, over a 2-day period, during which time aerial parts and roots were sampled at regular intervals. Whilst the glucosinolate patterns of the aerial part of the plant and of the roots remained the same, the levels of major glucosinolates in the aerial part, averaged over all sampling times and 2 days, were 233 ± 60 μmol 100 g−1 DW for 3-methylsulphinylpropyl and 72 ± 22 for 2-propenyl; in the roots, 2-phenylethyl and 1-methoxyindol-3-ylmethyl showed the highest average concentrations, with 678 ± 355 μmol 100 g−1 DW and 411 ± 122, respectively. Total and individual glucosinolate levels showed very high significant differences between the two plant parts. Despite the constant temperature, light and relative humidity, glucosinolates varied within a 24-h period, showing ultradian rhythms that are common to several metabolic processes in plants. The results confirm previous observations that at a temperature of 20°C, close to the optimum for growth and development, the diurnal variation in glucosinolate concentration, was smaller than at 30°C. © 1998 Society of Chemical Industry 相似文献
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实验以粮仓中安全水分稻谷为研究对象,探究稻谷在不同储藏温、湿度中的霉菌生长规律,采用Logistic方程拟合稻谷霉菌在不同储藏条件下的生长动力学模型,并对模型的适用性进行评价。结果显示,在20℃及以下,霉菌数量增长缓慢,稻谷处于安全状态;25℃时,43%和75%的湿度为安全储藏条件;30℃时,仅43%的湿度为安全储藏条件;40℃时稻谷霉菌数量变化较小。Logistic方程所拟合出的各个储藏条件中霉菌生长方程的决定系数R~2为0.987±0.017,适用于描述稻谷中霉菌的生长曲线。结合B_f和A_f值,同一温度下,环境相对湿度越高,模型的准确性越低;在10~30℃范围内,随着温度的升高,模型准确性下降。 相似文献
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目的建立一种同时测定食品中11种合成着色剂的高效液相色谱检测方法。方法样品经提取液提取,SPE-PWA萃取柱净化。以Phenomenex C_(18)色谱柱(250 mm×4.6 mm, 5μm)分离,优化流动相比例,以0.02 mol/mL乙酸铵(A)、甲醇(B)、乙腈(C)为流动相进行梯度洗脱。采用二极管阵列检测器(photo-diode array, PDA)进行变波长分析。结果 11种人工合成着色剂18 min内完成分析。各着色剂的浓度与峰面积在0.5~50.0 mg/L浓度范围内具有良好的线性关系,相关系数(r)在0.99989~1.00000之间。该方法的检出限为0.2mg/kg,定量限为0.5mg/kg,在0.5、2.0、10.0mg/kg3个添加水平的回收率为72.6%~106.3%,相对标准偏差(relativestandard deviation, RSD)小于7.8%(n=6)。结论本方法快速、准确、灵敏、高效,适合食品中合成着色剂的含量测定。 相似文献
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为解决品牌童装企业销售渠道冲突带来的问题,提高渠道绩效,在研究线上线下营销渠道冲突、渠道协同能力和渠道绩效的基础上,进行渠道协同维度、渠道绩效维度和渠道协同能力等级划分。在理论分析的基础上,提出研究假设并构建逻辑模型。基于问卷调研数据,以渠道协同能力为中介变量,运用多元回归法实证分析了品牌童装企业渠道协同对渠道绩效的影响。研究结果表明:渠道协同的5个维度对渠道绩效有显著的正向影响;渠道协同能力与渠道绩效有显著的正相关关系;渠道协同能力在渠道协同与渠道绩效中具有部分中介效应;品牌童装企业应通过渠道协同解决渠道冲突及提高渠道协同能力和渠道绩效。 相似文献
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Frictional characteristics of woven fabrics can determine smoothness and softness values of textiles. In this paper, we have studied the influence of factors such as temperature, relative humidity, fabric structure, type of fiber material, and direction of motion on roughness properties of fabric surface using response surface method (RSM). For this purpose, woven fabrics with plain, rib2/2, twill2/2, twill1/3, twill3/1, twill1/7, and twill7/1 were produced with polyester warp yarn and two different weft yarns (cotton and polyester). Then, a statistical model (RSM) was used for the experimental plan (with these variables) to determine the runs of experiment (or selected points). Next, the frictional forces measurement was carried out on the fabrics in those directions. The experimental results showed that fabric-to-fabric friction (static frictional resistance, kinetic frictional resistance, and smoothness of woven fabrics) is highly sensitive to factors like relative humidity, fabric structure, type of fiber material, and direction of motion while temperature factor (in the range 0–50°C) has no sensitive effect on frictional parameters. 相似文献