聚丙烯

Demonstrated by adsorptive capacity and adsorptive energy, polyacrylamides have strong interaction on mineral surface with similar action mode to that of starches, for example, hydrolyzed polyacrylamide and hydroxamic acid polyacrylamide mainly by chemical force, cationic polyacrylamide by electrostatic force and hydrogen bond, nonionic polyacrylamide by hydrogen bond, while amphoteric polyacrylamide embodying both the characters of anionic and cationic one.

聚丙烯酰胺类化合物在矿物表面的吸附能以及吸附量均显示出药剂与矿物间存在的强作用，作用方式与淀粉类药剂相似：阴离子聚丙烯酰胺、羟肟酸聚丙烯酰胺主要靠化学作用，阳离子聚丙烯酰胺借助静电力和氢键，非离子型的聚丙烯酰胺则主要是氢键作用，两性聚丙烯酰胺同时具有阴离子和阳离子聚丙烯酰胺药剂的作用特点。

B. Nonmetallic chemical equipment: Graphite modified polypropylene tube-arrayed heat converter, falling-film absorber, polypropylene vacuum metering tank, sucking and screening bucket, polypropylene water spraying vacuum pump, and the popypropylene, polythylene glycol tank.

B。非金属化工设备：石墨改性聚丙烯列管式换热器、降膜改收器、聚丙烯真空计量槽、抽滤桶、聚丙烯水喷射真空泵；聚丙烯、聚氯乙烯储槽。

In this paper, problems found in using intermittent liquid bulkpolymerization to produce propylene were discussed, and the factors,which influenced the quality of polypropylene, were analyzed. A series ofmethods to solve the problems existed in the production of polypropylenewith intermittent liquid bulk polymerization were proposed.

本文对间歇式液相本体法聚丙烯生产工艺存在的问题及对聚丙烯产品的影响因素进行了分析，提出了一系列技术改进措施并应用装置生产中，促进了间歇式液相本体法聚丙烯的发展。

The effect of the grafting of maleic acid onto chlorinated polypropylene on the surface property was studied.

研究了马来酸酐在氯化聚丙烯分子链上的接枝对其表面性质的影响，探讨了马来酸酐接枝氯化聚丙烯与聚丙烯及金属的粘接作用及耐水性。

The CPP was separated into five fractions using fractional precipitations by solvent/nonsolvent technique. Densities for binary mixtures of five fractionated and unfractionated CPP which contains a mass fraction of 30 % chlorine with solvents were determined. At a fixed temperature, concentration and solvent, the densities for binary mixtures of fractionated and unfractionated CPP with solvents have the same value.

用沉淀分级方法对氯含量为30％的氯化聚丙烯进行分级，得到5种窄分子量的级分，测定了氯化聚丙烯的不同级分与不同溶剂组成的二元混合物溶液的密度，在溶剂一定、浓度一定、温度一定时，不同级分氯化聚丙烯溶液的密度是相同的，不受分子量及其分布的影响。

The transparent modification of PP by using DMDBX as nucleator was studied, too. The result showed the ability of increasing transparency of PP by DMDBX as about the same as that by Millad3988, and some other mechanical properties of PP could also be improved.

采用DMDBX作为成核剂对聚丙烯进行了透明改性研究，结果表明：DMDBX对聚丙烯的增透能力与Millad3988相当，同时对聚丙烯的其他物理性能也有一定改善效果。

In the tests, the nonionic type polyacrylamide, the anion type polyacrylamide and the zwitterion type polyacrylamide, and the compounding of the poly-aluminum chloride/PHP and the calcium chloride (CaCl2)/NPAM were used as flocculation agents.

选择聚合氯化铝/阴离子型聚丙烯酰胺、氯化钙（CaCl2）/非离子型聚丙烯酰胺组合与NPAM、PHP、两性离子型聚丙烯酰胺作为絮凝剂，在对道清选煤厂水采筛下原生煤泥和浮选尾矿的煤泥水进行组合药剂絮凝实验的基础上，考察了pH对煤泥水絮凝沉降的影响。

PP1740 copolymer is a multi phase copolymer,composed of homo-polypropylene,ethylene-propylene rubber,and crystallizable propylene-ethylene copolymer.Homo-polypropylene part offers rigidity and EPR part offers impact strength.The relative ...

研究结果表明，PP1740共聚物由均聚聚丙烯、乙丙橡胶和可结晶的乙丙共聚物组成，具有优良的机械性能；均聚聚丙烯为PP1740共聚物提供刚性，乙丙橡胶可提高PP1740共聚物的抗冲性能；PP1740共聚物的相对分子质量分布呈多分散性，相对分子质量分布较宽；乙丙橡胶的相对分子质量较大，以直径1～2μm球型微粒均匀分布在聚丙烯基体中，有利于提高PP1740共聚物的冲击强度；PP1740共聚物的熔点较高，耐热性好。

In acid pulp, the depressing abilities of reagents on diaspore are in the order of hydroxamic acid starch＞dialdehyde starch＞carboxymethyl starch＞cationic starch＞primary starch. In addition, hydroxamic acid starch and carboxymethyl starch can activate kaolinite without influence on the recoveries of pyrophyllite and illite, so the two reagents have great potential and prospect to be the depressant of diaspore and the activator of kaolinite in bauxite reverse flotation.(3) By oximation of the copolymer of acrylamide and methyl acrylate, hydroxamic acid polyacrylamide is synthesized.

3对丙烯酰胺和丙烯酸甲酯的共聚物肟化制得氧肟酸聚丙烯酰胺，将它同非离子聚丙烯酰胺、阴离子聚丙烯酰胺、阳离子聚丙烯酰胺和两性聚丙烯酰胺分别应用于四种矿物的单矿物浮选试验，结果显示，改性聚丙烯酰胺对一水硬铝石、高岭石和伊利石均具有活化作用，其中，药剂对高岭石的活化最强，使它的回收率在整个pH值范围达到80％左右，在一定pH条件下超过一水硬铝石的回收率，解决了高岭石难浮选的问题。

The coal filled PP composites have higher fracture toughness when the content of coal is high (When the content of coal is 50wt%, the K〓 of composites remains 50% of PP). The F-C alkylation has grafted long chain alkyl on the surface of coal, and then toughens the coal/PP composites.

超细煤粉填充聚丙烯复合材料平面断裂韧性的系统测试以及微观结构的观测表明，煤填充聚丙烯复合材料在高煤含量情况下仍具备一定的韧性（当煤含量达50wt％时，应力强度因子K〓仍能保持纯聚丙烯的50％左右）；烷基化改性在煤样表面接枝了长链的烷基，使粉煤/聚丙烯复合材料平面断裂韧性普遍提高。

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。