国内建筑给水用PP-R管道的现状和发展趋势

PP-R管材是目前产量最大的建筑冷热水管,有性能好、价格适中、卫生、无污染、安装方便可靠等优点;但是也有热变形大,膨胀系数大等明显缺点.国内一些PP-R管道主要生产企业多年来为克服这些缺陷,相继推出PP-R/AL,如PP-R塑铝稳态复合管、双热熔型PP-R塑铝复合管,F-PPR(三层共挤PP-R稳态复合管)等新型聚丙烯复合管道,这些管道不仅克服了PP-R管道热变形大,膨胀系数大等缺陷,还提高了管道系统的承载能力.     

丙烯/α-烯烃共聚聚丙烯的研究进展

对聚丙烯的发展情况进行介绍,综述了丙烯与乙烯、丁烯、己烯等α-烯烃共聚反应的研究进展及其共聚物的性能,并指出我国共聚聚丙烯的发展前景。     

中国塑料专利

<正>专利名称:聚丙烯共混输液软袋申请公布号:CN102397160B申请公布日:2014.01.08一种聚丙烯输液软袋,由袋体、与袋体一体化成型的灌装口部组成,所述袋体随药液的不断排出自袋体中间位置的方向先向内收缩变形,并逐渐分别向所述灌装口部和袋体底部方向延伸,其特点是该聚丙烯输液软袋的材质为一种药用级乙烯与丙烯的共聚物或药用级乙烯与丙烯、丁烯的共聚物或药用级乙烯与丙烯、苯乙烯的共聚物与另一种聚丙烯混合构成,其中药用级乙烯与丙烯的共聚物或药用级乙烯与丙烯、丁烯的共聚物或药用级乙烯与丙烯、苯乙烯的共聚     

无规共聚聚丙烯的研究进展

简述了无规共聚聚丙烯的发展现状,无规共聚聚丙烯的结构特点与性能之间的关系;综述了丙烯与乙烯、丁烯、己烯等α-烯烃共聚反应的研究进展及其共聚物的改性,并指出我国共聚聚丙烯的发展前景。     

三元共聚聚丙烯市场前景分析

三元共聚物的生产是将丁烯、乙烯加到丙烯中,三种组份在催化剂的作用下,在反应器中反应生成三元共聚物。三元共聚聚丙烯与二元共聚聚丙烯相比,具有更好的低温热封性能和透明性,以及优异的抗粘连性,因此更适合做高档膜料,广泛应用于食品包装的蒸煮袋、复合膜、香烟包装膜、热收缩膜、金属复合膜等加工和制造领域中。     

HDPE增韧PP-R(PP-B)/弹性体/石墨复合材料的研究

采用高密度聚乙烯(HDPE)为增韧剂，(乙烯／丙烯／二烯)共聚物(EPDM)、(乙烯／辛烯)共聚物(POE)弹性体为增容剂，石墨为功能性助剂制备了以无规共聚聚丙烯(PP-R)或嵌段共聚聚丙烯(PP-B)为基体的PP-R(PP-B)／HDPE／弹性体／石墨复合材料。研究了HDPE含量、弹性体种类及含量对PP-R(PP-B)复合材料力学性能的影响。结果表明，HDPE含量在20％、EPDM含量为5％时，PP-R(PP-B)复合材料的力学性能优异；POE可以使PP-R复合材料的力学性能达到均衡。     

塑铝PPR稳态管生产新工艺解析

介绍分析塑铝 PPR 稳态管的最新生产工艺技术,阐述 PP-R 塑铝稳态管的精密温度控制系统及高速成型系统的研究及开发进展,根据国内外稳态管的发展生产情况,提出发展我国自主知识产权的塑铝稳态管的生产建议     

微米级碳酸钙高填充丙烯-1-丁烯共聚物的制备

用微米级碳酸钙对丙烯-1-丁烯共聚物进行了填充改性,研究了高填充量碳酸钙对试样物理性能、结晶性能、熔融性能的影响.结果表明:在丙烯-1-丁烯共聚物中填充其质量20％～40％的微米级碳酸钙可以提高基体树脂的弯曲模量、冲击强度,减小注塑试样收缩率的各向异性,提升尺寸均匀性,但对丙烯-1-丁烯共聚物熔体的流动性有不利影响.高...     

塑铝PPR稳态管生产新工艺解析

介绍分析塑铝PPR稳态管的最新生产工艺技术,阐述PP-R塑铝稳态管的精密温度控制系统及高速成型系统的研究及开发进展,根据国内外稳态管的发展生产情况,提出发展我国自主知识产权的塑铝稳态管的生产建议。     

乙烯-丙烯-1-丁烯三元共聚合

采用自制的ziegler-Natta催化剂催化乙烯-丙烯-1-丁烯三元共聚合.考察了1-丁烯/丙烯、铝钛比、反应温度和压力等对三元共聚合的影响.结果表明.三元共聚物中支化度约为26门000 C,其中乙基支链为18/1 000 C、丙基支链为8/1 000 C.在聚合温度为60℃、压力为0.8 MPa、乙烯分压百分数为70%、1-丁烯分压百分数为5.7%和丙烯分压百分数为24.3%时,催化活性最高,为10.5 kg/g.当n(Al)/n(Ti)大于100时,催化活性增加趋势变缓.聚合压力超过0.8 MPa时,催化活性变化不大.聚合平行实验结果表明,上述条件稳定,所得三元共聚物的表观密度为0.32g/cm3,拉伸强度为11～12 MPa、断裂伸长率为540%～560%.     

高耐温性钢塑管材用热熔胶黏剂的制备及性能研究

以神华均聚聚丙烯（PP）为基体树脂,通过与聚烯烃弹性体（POE）共混反应挤出制备了高耐温性钢塑管材用热熔胶黏剂。研究了引发剂含量、接枝单体含量和PP/POE配比对热熔胶性能的影响,考察了自制热熔胶在实际应用中的耐温性能。结果表明,反应挤出制备的聚丙烯接枝马来酸酐(PP?g?MAH)基热熔胶综合性能优异,其剥离强度和100 %拉伸弹性回复率分别可达131.4 N/25 mm和65.5 %;高低温循环（-40~130 ℃）800次后自制热熔胶的剥离强度依然可以维持在122.2 N/25 mm,剥离失效率只有7.0 %,其耐温性明显优于选取的两个商业化牌号热熔胶。     

TGIC副产物在热熔胶黏剂中的应用

添加了抗氧化剂的TGIC副产物经蒸馏,得到较纯净的副产物,并将其与热熔胶黏剂按一定比例混合,得到一种复合胶黏剂.分析了副产物与热熔胶黏剂的配比对持黏性、T—剥离强度、180°剥离强度、软化点、熔融黏度的影响.当TGIC副产物与热熔胶黏剂的配比为2∶8时,所制备胶黏剂的主要力学、理化指标仍能满足家具封边、胶订等领域的行业...     

热塑性弹性体SISIS的微相分离,性能及应用

用差示扫描量热仪测试ＳＩＳＩＳ的玻璃化转变温度分别为３７３Ｋ和２１５Ｋ。用电子是为微镜观察并分析了高分子结构对微观相分离的影响，ＳＩＳＩ呈现明显的两个分离结构特点，较主同的聚苯乙烯含量或较长的中间段聚苯乙烯链段有助于形成更精细的微观相分离。     

管道防腐用改性EVA热熔胶的研制

在有机过氧化物的引发下,马来酸酐与熔融的EVA树脂接枝聚合,配合增黏树脂、填料及其它助剂,制备出用于油气管道密封防腐的热熔胶。首先考察了不同VA含量、熔体指数的EVA树脂的粘接强度,试验结果表明VA含量为28、MI值为280的EVA树脂具有最佳的性能,通过对MAH不同加入量对热熔胶性能影响的探讨,发现接枝改性后的热熔胶粘接强度得到了极大的提高,在MAH用量为12份时剥离强度可达17．4kN／m。冷热交变及耐介质实验也表明热熔胶具看优异的耐侯性和耐腐蚀性。     

聚乙烯热熔胶增容聚乙烯基木塑复合材料的研究

采用废木粉和高密度聚乙烯制备复合材料,并采用一种聚乙烯热熔胶作为相容剂以增进憎水性的聚乙烯基材和亲水性的木粉界面的相互作用。评价了该热熔胶的增容效果,并对其增容机理进行了详细论述。研究结果表明:该热熔胶的主要成分为马来酸酐接枝高密度聚乙烯(PE-HDg-MAH)和乙烯-醋酸乙烯酯共聚物(EVA);添加木粉有利于弯曲强度和弯曲模量的提高,但使冲击强度和拉伸强度迅速下降;该热熔胶可明显提高复合材料的力学性能,并且木粉的填充量越高,则增容作用就越明显;当木粉的用量为50％时,使用该热熔胶可使复合材料的拉伸强度、弯曲强度、弯曲模量和冲击强度分别提高115．6％、66．7％、38．1％和67％;基于这些结果可知,该热熔胶可显著提高聚乙烯基材／木粉界面处的亲和力,是聚乙烯基木塑复合材料理想的增容剂。     

Amine-terminated nylon 6/66/1010 (AM-6/66/1010) used for hot melt adhesives: synthesis and properties

A new amine-terminated nylon 6/66/1010 (AM-6/66/1010) copolyamide hot melt adhesive with the molecular weight of 21,000–96,000 Da was synthesized and blocked with 1-hexadecylamine. The AM-6/66/1010 samples were characterized by ¹H-NMR spectroscopy, differential scanning calorimetry (DSC), thermal gravimetric analysis, and gel permeation chromatography. The ¹H-NMR spectroscopy demonstrated that 1-hexadecylamine functions as blocking agent in this polymerization. The DSC thermograms showed that the extra peak (peak (II)) and the melting peak (peak (I)) of AM-6/66/1010 are moving left and the glass transition temperature of AM-6/66/1010 decreases as the mole ratio α_H/C (1-hexadecylamine/total carboxyl) increases. The thermal gravimetric analysis indicated that AM-6/66/1010 hot melt adhesive has a high thermal stability. The peel strength of the test specimen obtained by hot melt glutinous lining of AM-6/66/1010 or AC-6/66/1010 and fabric 6535 (65% PET, 35% cotton) was studied using T-peel tests, and the results showed that the washable and dry-cleaning resistant of AM-6/66/1010 copolyamide hot melt adhesive is better than that of carboxyl-terminated nylon 6/66/1010 (AC-6/66/1010) copolyamide hot melt adhesive.     

BOPP烫印用热熔粘合剂

以EVA为主体成分，通过与高软化点的增粘树脂、氧化或未氧化聚烯烃蜡及填料共混制备BOPP烫印用的热熔粘合剂（HMA）。考察了组分品种和用量对上烫性、分切性和剥离强度的影响。     

电子行业用聚酯热熔胶的制备及其性能研究

以玻璃化转变温度较低的共聚酯制备了聚酯热熔胶。研究结果表明:聚酯热熔胶对丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚碳酸酯(PC)等极性塑料与金属材料具有良好的粘接性能,稳定后的剥离强度大于100N/25mm;同时,具有良好的耐老化性能及粘接持久性。聚酯热熔胶可取代国外产品用于电子行业用极性聚合物与金属材料粘接。     

Adhesion and Failure Mechanisms of a Model Hot Melt Adhesive Bonded to Polypropylene

A model hot melt adhesive (HMA) based on an ethylene/vinyl acetate copolymer (EVA), an Escorez® hydrocarbon tackifier, and a wax has been used to bond together polypropylene (PP) films to give equilibrium bonding. Peel strengths were determined over a broad range of peel rates and test temperatures. Contrary to the peel behavior of joints with simple rubbery adhesives [1], peel strengths with this semi-crystalline adhesive are not rate-temperature superposable, and multiple transitions in failure locus occur. The semi-crystalline structure of the HMA also prevents rate-temperature superposition of its dynamic moduli.

At different test temperatures, the dependence of peel strength on peel rate shows some resemblance to the dependence of the loss tangent of the bulk adhesive on frequency. This is consistent with a previous result [2] that the HMA debonding term. D, varies with the loss tangent of a HMA at the T-peel debonding frequency.

This model HMA, similar to block copolymer/tackifier blends [3], consists of two phases: an EVA-rich and a tackifier-rich phase, in its amorphous region. At a low peel rate of 8.33 × 10^-5 m/s, the peel strength shows a maximum at a temperature that corresponds to the transition temperature of the tackifier-rich phase (T₁). At a higher peel rate of 8.33 × 10^-3 m/s, the peel strength rises with increasing test temperature, but becomes essentially constant at temperature T₁'. It is believed that, to optimize the peel strength of a HMA at ambient temperature, it is advantageous to formulate the EVA polymer (or other semi-crystalline polyolefins) with a compatible tackifier that yields a tackifier-rich phase with a transition temperature (T₁') in the vicinity of room temperature.     

Structure and adhesion properties of acrylic acid grafted high‐density polyethylene powders synthesized by a novel photografting method

A novel photografting, nonvapor, and nonliquid phase living graft polymerization was developed to functionalize high‐density polyethylene (HDPE) powder. The structure and adhesion properties of HDPE powder grafted with acrylic acid (AA) were studied by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), water contact angle, peel strength, and graft degree measurements. The result shows that HDPE powder can be grafted with AA via the method with a short reaction time and a high monomer conversion. The graft degree increases with the reaction time. Then, the hydrophilicity of the grafted HDPE powder increases also. The peel strength of HPDE/steel joint improved significantly when acrylic acid grafted HPDE powder was used as hot melt adhesive in place of ungrafted HDPE powder. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008