共查询到19条相似文献,搜索用时 109 毫秒
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详细论述了国内外聚乙烯管材专用料的生产、开发及产品使用的发展状况,并根据目前国内的市场需求及未来的发展,提出我国聚乙烯管材专用料的开发方向。 相似文献
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国内外聚乙烯管材专用料的开发及应用 总被引:3,自引:0,他引:3
详细论述了国内外聚乙烯管材专用科的生产,开发及产品的使用情况,并根据目前国内的市场需求及未来的发展,提出我国聚乙烯管材专用料的开发方向。 相似文献
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HDPE管材行业的发展 总被引:2,自引:0,他引:2
综述了我国高密度聚乙烯(HDPE)管材生产现状,阐述了HDPE管材的发展历程,分析了我国HDPE管材行业存在的问题及市场应用前景。建议我国HDPE管材行业,应加强管材专用树脂的开发力度。强化品牌建设,完善市场秩序。 相似文献
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我国聚乙烯和聚丙烯树脂品种牌号分析(Ⅰ) 总被引:2,自引:2,他引:0
在对我国聚乙烯、聚丙树脂牌号调查的基础上,就合成树脂高性能专用料(高强度薄膜、管材、中空容器、电缆、涂层、棚膜、氯化聚乙烯、双向拉伸聚丙烯、流延膜、烟用丝束、聚丙烯纤维料、洗衣机专用料等)的生产情况进行了介绍,并就今后的发展提出了几点建议。 相似文献
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我国聚乙烯和聚丙烯树脂品种牌号分析(Ⅱ) 总被引:4,自引:1,他引:3
在对我国聚乙烯、聚丙烯树脂牌号调查的基础上,就合成树脂高性能专用料的生产情况进行了介绍,并就今后扫展提出了几点建议。 相似文献
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用固体核磁技术分析了2种具有不同抗熔垂性能的聚乙烯管材料的凝聚态结构与流变性能。管材树脂的抗熔垂性能与其核磁迟豫特性紧密相关,好的抗熔垂性能对应更长的纵向迟豫时间。抗熔垂性能好的双峰管材料的重均分子量更高,高相对分子质量部分的含量更多。 相似文献
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John H. Cross E. R. Mitchell James H. Tumlinson Donald E. Burnett 《Journal of chemical ecology》1980,6(4):771-779
The release rates of (Z)-9-tetradecen-1-ol formate (Z9TDF) from four sizes of polyethylene tubing were measured periodically for 50 days by collecting the Z9TDF vapors on a polymeric adsorbent. The resulting release rate curves had shapes that were determined by the tubing's diameter and wall thickness. One tubing size that combined good longevity with adequately high release rates was tested in the field to determine whether it could disrupt pheromone communication of the corn earworm,Heliothis zea (Boddie). We observed a low percentage of disruption, but release rate measurements made concurrently showed that the tubing was releasing Z9TDF normally. In a second field test, a larger quantity of Z9TDF was released, and 87% disruption was attained for 66 days.Mention of a commercial or proprietary product in this paper does not constitute endorsement of that product by the USDA. 相似文献
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结合聚乙烯管材长期性能评定方法——SEM标准回归法,通过对钢骨架增强塑料复合管材进行长期静液压强度试验,并建立合理的数学模型,预测了钢骨架增强塑料复合管所能承受的静液压能力和长期使用寿命。 相似文献
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A temperature-dependent model for predicting release rates of pheromone from a polyethylene tubing dispenser 总被引:1,自引:0,他引:1
S. J. Bradley D. M. Suckling K. G. McNaughton C. H. Wearing G. Karg 《Journal of chemical ecology》1995,21(6):745-760
A model was developed to describe release of two formulations of tetradecenyl acetates in Shin Etsu polyethylene tubing pheromone dispensers. Change in pheromone column length in the polyethylene tubing was modeled bydl/dt=l ... (a+bT)/dt (wherel is column length,t is time interval, andT is average temperature for that time interval). Regression of the natural log of relative change in liquid length against time interval and accumulated day degrees in orchards produced the coefficientsa andb. The model was validated by comparing predicted and actual liquid length remaining in field-aged dispensers, as well as measuring release rates by using gas chromatography. Mean daily orchard temperatures and measurement of column length of dispensers on a single date were used to accurately predict column length within 15%, after six months. Predictions of instantaneous release rate were also made from this model, and other possible model uses and limitations are discussed. 相似文献
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HDPE管材专用树脂的流变性能 总被引:1,自引:1,他引:0
应用动态流变仪、毛细管流变仪和转矩流变仪,对新型双峰高密度聚乙烯(HDPE)管材专用树脂 6380 M进行流变性能测试分析,并与国内外相同压力等级的HDPE管材专用树脂进行比较。结果表明,6380 M的各种流变性能与进口管材专用树脂相当,而与单峰HDPE管材专用树脂相比具有弹性模量低、零切黏度低、拉伸黏度低的流变特性,从而对其加工性能产生影响。6380 M流动性好,其临界剪切速率高,但熔体强度不及单峰HDPE。 相似文献