共查询到20条相似文献,搜索用时 203 毫秒
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利用5万t/a聚苯乙烯装置开发挤塑聚苯乙烯泡沫塑料(XPS)板材专用料PS 680X,确定了树脂的合成工艺,并对树脂的物理力学性能和加工性能进行了表征。结果表明:PS 680X具有较高的分子量和适当的分子量分布范围,综合性能优良,适合于XPS的生产要求。 相似文献
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聚苯乙烯(PS)是产量和消费量仅次于聚乙烯、聚氯乙烯和聚丙烯的通用树脂。聚苯乙烯主要有三个品种:通用型(GPPS)树脂、耐冲击型(HIPS)树脂和发泡(EPS)树脂。 相似文献
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在苯乙烯-丙烯腈共聚物和高抗冲聚苯乙烯装置上生产确定指标的本体聚苯乙烯树脂有一定的难度。从实践中总结探索出一套生产B-3、B-4、B-5型PS树脂的主要控制条件,其中B-5型PS树脂的性能和美国685D型PS树脂的性能相当。 相似文献
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以交联聚苯乙烯树脂为原料,丁二酸酐为酰基化试剂,经Friedel-Crafts酰基化反应,制得脂肪族羧酸型树脂羧酸型聚苯乙烯(PS—COOH).将纤维素苯基氨基甲酸酯通过纤维素糖单元上的羟基与酰氯化的羧酸型功能树脂氯代羧酚型聚苯乙烯(PS—COC l)反应,得到键合型纤维素类手性固定相.通过红外光谱对树脂进行表征,并研究纤维素酯不同的键合方法、纤维素酯之间的"互穿"作用、酰化剂用量、纤维素苯基氨基甲酸酯用量对该反应的影响及衍生化纤维素相对分子质量分级和相对分子质量分布.结果表明:PS—COOH树脂与酰化剂用量为1∶7,PS—COOH树脂与纤维素苯基氨基甲酸酯的投料比为1.0∶1.1为宜;使用纤维素二苯基氨基甲酸酯和纤维素三苯基氨基甲酸酯"互穿"后键合大大提高质量增加率;通过二次沉淀的方法可以得到相对分子质量窄分布的纤维素酯. 相似文献
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<正> 一、前言我国绝大多数磁带厂都是采用聚苯乙烯树脂(PS)生产带盒,也有个别厂用AS树脂生产带盒。用聚苯乙烯生产带盒都存在易炸裂问题,我厂也存在这个问题。这是聚苯乙烯特性所决定的。聚苯乙苯树脂是由苯乙烯在一定条件下聚合而成。即 相似文献
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聚丁二烯橡胶(简称PBR,国内一般称为顺丁橡胶)具有弹性好、耐磨性强、耐低温性能好等优点,在轮胎、抗冲击改性聚苯乙烯(PS)和ABS树脂、胶带等橡胶制品的生产中应用广泛,开发利用前景广阔。 相似文献
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工业聚烯烃牌号调度生产中的柔性研究 总被引:1,自引:0,他引:1
讨论了聚烯烃生产企业接受订单前,在完成订单所需生产时间及生产经济性进行分析的基础上,以生产利润最大化为优化目标,提出了一个以订单为基础的调度决策模型,同时对牌号生产顺序进行优化,为企业柔性生产提供了决策依据。 相似文献
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磷酸分段串联浓缩生产性试验 总被引:1,自引:0,他引:1
云天化三环分公司为提高浓缩装置生产能力,进行了磷酸浓缩E、D系列分段串联两段浓缩的生产试验。介绍试验过程和试生产运行情况,并对两段浓缩取得提高生产能力60%,有利于清除磷酸中的淤渣等技术优势进行了分析,也提出了试验中存在的问题与有待改进之处。 相似文献
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介绍了台湾塑胶工业股份有限公司高密度聚乙烯(HDPE)树脂的生产装置、工艺技术、生产能力、树脂牌号及新产品开发现状,同时阐述了HDPE专用树脂的开发策略。目前,台塑公司HDPE商品牌号台塑烯的产品包括薄膜专用树脂、中空吹塑专用树脂、挤出专用树脂和注塑等用树脂等,并且产品具有单峰、双峰甚至宽峰相对分子质量分布的特性。2006年,台塑公司将调整台塑烯专用树脂的生产比例,强化产品结构而维持一定的营利水平。 相似文献
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Plant Density and Nutrient Availability Constrain Constitutive and Wound-induced Expression of Trypsin Inhibitors in Brassica napus 总被引:6,自引:0,他引:6
We investigated the effects of plant density on plant size, leaf total soluble protein content, and constitutive and wound-induced levels of proteinaceous trypsin inhibitors in pot-grown Brassica napus seedlings in two greenhouse studies. We manipulated plant density by varying the number of intraspecific neighbors surrounding a target plant in the center of each pot. In general, constitutive and induced levels of trypsin inhibitors were significantly reduced by competition in a density-dependent manner, to the extent that induction was greatly reduced or abolished in target plants surrounded by six neighbors. To investigate whether the effects of plant density on inhibitor production were mediated by nutrient availability, we manipulated the concentration of a complete fertilizer applied to target plants surrounded by six neighbors in two greenhouse studies. In general, constitutive and wound-induced levels of inhibitors in plants surrounded by six neighbors were increased by nutrient addition in a dose-dependent manner, such that wound-induction was completely restored in competing plants under conditions of high nutrient availability. Leaf total soluble protein content, measured only in the second trial of each experiment, was not affected by any of the treatments. The effects of plant density, nutrient addition, and wounding on inhibitor levels in all experiments were independent of their effecs on above-ground plant size at the time of wounding. Overall, our results suggest that decreasing nutrient availability mediates the density-dependent reductions in inhibitor levels in B. napus seedings. 相似文献
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国内市场透明聚丙烯的性能与分析 总被引:3,自引:0,他引:3
介绍了透明聚丙烯(PP)专用料的国内市场现状、牌号、性能,着重分析了扬子石化公司透明PPJ301G,提出扬子石化公司应重点开发无规透明PP专用料以及中高熔体流动速率无规透明PP专用料的设想,并为工业化无规PP中低熔体流动速率的专用料提出理化分析数据。 相似文献
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In this work the bilinear model predictive control method is applied to control the grade change operations in paper production
plants. Because of the high nonlinearity of the grade change processes, control of the grade change operations has been performed
manually by experienced engineers in the plants. In some cases the bilinear model can be very effective to represent nonlinear
processes. In this study a bilinear model for paper plants is identified first. It is found that the bilinear model tracks
the plant without significant discrepancy. Based on the multivariable bilinear plant model the optimal input variables are
computed using the one-step ahead prediction method. Even for frequent changes in paper grades the bilinear model predictive
control scheme exhibits good control performance. 相似文献