查询词典 polypropylene

In this paper, a new dyeable fine polypropylene filament whose dpf was less than 1 dtex has been prepared by admixing polyolefine additive to the polymer prior to melt extrusion and it was practically proved that the spinning process was stable.

本课题首次找到并合成了具有适宜分子量和分子量分布的聚烯烃类添加剂，将其加入到熔融的聚丙烯中，纺制出dpf小于1dtex的细旦可染聚丙烯长丝，并且纺丝过程稳定。

As a result of the poor impact behavior of polypropylene at low temperatures, blending PP with an elastomeric phase is often performed.

然而，弹性体的加入往往伴随着PP刚性和强度的大幅度降低，多数情况下还会影响到PP的耐热性和流动性能。

In this paper,the Lactate dehydrogenase, malate dehydrogenase,superoxide dis-mutase of five tissues of Carassius auratus gibelio; Cyprinus carpio Linnaeus; Esox americanus Gmelin; Leuciscus waleckii in Dalai Lake were studied by vertical polypropylene gel electrophoresis and the isozyme composion of four kinds of fishes were obtained. Then the analysis of the expressing specify of 3 kinds of isozyme in different tissues and loci were carried on and the genetic base of isozyme system was discussed.

本实验采用垂直板聚丙烯酰胺凝胶的电泳方法对达赉湖的野生鲤鱼、银鲫、狗鱼、东北雅罗鱼的五种组织脏器(肌肉、心脏、肝脏、脑、眼睛)的三种同工酶(苹果酸脱氢酶、乳酸脱氢酶、超氧化物岐化酶)进行了初步研究，获得了达赉湖四种鱼类物种的同工酶谱，在此基础上对同工酶在不同组织的表达差异和基因位点进行分析，探讨其同工酶系统的遗传基础。

Under these conditions the adhesive showed good adhesive property and the shear strengths of felted polypropylene and adhered steel materiafreached 3.4MPa and 7.7Mpa respectively.

在此条件下制备的共聚物粘接聚丙烯材料和钢的剪切强度分别达3.4 MPa和7.7 MPa。

The results showed that:(1) different geometrical states of polypropylene fibres had obviously effects on the plastic shrinkage cracking properties, and PP fibres by drawing wire had better effect than fibrillated film ⅡPP fibre, the latter had better effect than fibrillated film ⅠPP fibre;(2) the plastic sh...

结果表明：(1)聚丙烯纤维几何形态对抗塑性干缩开裂性能有明显影响，拉丝PP纤维效果最好，膜裂ⅡPP纤维次之，膜裂ⅠPP纤维最差；(2)聚丙烯纤维掺量对抗塑性干缩开裂性能也有较大影响。

Employing this principle, we began in 1984 to use a tension-free repair, suturing a polypropylene mesh patch over the defect without attempting to close the hernial hole.

应用这一原则，我们从 1984 年开始做无张力疝修补，把补片缝合于缺损部位上而不是试图将疝缺损强行拉合在一起。

Effect of metal salts of substituted aromatic heterocyclic phosphate on the properties and morphology of isotactic polypropylene were studied.

研究了不同的取代芳基杂环磷酸金属盐类成核剂对等规聚丙烯性能及其微观形态的影响。

Corporation produces the round hole, the superfine pore and each kind of heteromorphous hole spurt the screw stock, to cast take the lead, the clean needle and the spinning module are suitable for the polyester fiber, the polypropylene fiber, the polyamide fiber, the ammonia black silk ribbon, the acrylic fibers, the adhesive-bonded cloth, compound spin, the PVC rug and so on.

公司所生产的圆孔、超细微孔和各种异形孔喷丝板、铸带头、清洁针及纺丝组件适用于涤纶、丙纶、锦纶、氨纶、晴纶、无纺布、复合纺、PVC地毯等。

The isotactic polypropylene obtained with Et3 Al contained ethylene units when the ratio of Al to Ti was 150 at 100℃.However,the isotaetie polypropylenes obtained with i Bu3 Al and Hex3 Al at 100℃ did not contain isobutene and hexene units.

助催化剂为Et3Al聚合得到聚丙烯链结构中含有少量乙烯共聚单元；而助催化剂为Me3Al， i Bu3Al和Hex3Al聚合得到聚丙烯链结构中没有发现共聚单元。

Based on the deterioration mechanism of corrosive medium, a lot of polymer such as ternary-polymer, adding-felt addition, hydrophobe and polypropylene fiber were added to enhance the performance of anti-corrosion, anti-penetration, conglutination and anti-cracking of original cementious material. The microstrure of cementious material was changed from the simplex hydration product of cement to the superposition structure of the hydrolysate of polymer and the hydration product of cement. A lot of the corrosive ions were prevented from the interior of concrete by this stable structure. The results of tryout indicated that the mending material has the good effect at the corrosion form of corrosive medium.

根据介质腐蚀形式的劣化机理，该文以提高修补材料耐腐蚀性能、抗渗透性能、粘结性能和抗裂性能为出发点，采用添加有机硅改性三元共聚物、增粘剂、孔隙憎水剂等多种聚合物和聚丙烯纤维对原水泥基材料进行改性，使得修补材料的内部微观结构从单纯的水泥水化产物转变成聚合物和水泥水化产物叠合的空间网状结构，这种稳定的结构能有效抵抗各种介质离子的侵蚀，在实际工程上的试用也显示出新修补材料良好的使用效果。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。