加工助剂TKM80在木塑复合材料中的应用研究

研究了加工助剂60NSF,TKM80,WB16对聚丙烯(PP)基木塑复合材料机械性能和流变性能的影响。结果表明,60NSF,TKM80,WB16这3种助剂中TKM80对木塑复合材料机械性能的提高最大,与未加TKM80比较,当TKM80用量为7.5份时,木塑复合材料的拉伸强度提高20.9%,冲击强度提高55.6%,加工流变性得到很大的提高;从试样的冲击断裂面的扫描电镜照片,可以看出TKM80能够提高木粉在PP基体中的分散性,并改善PP与木粉之间的相容性。     

相容剂对CR/EPDM并用胶性能的影响

试验研究相容剂对CR/EPDM并用胶硫化特性和物理性能的影响.结果表明,随着停放时间的延长,未加相容剂和加入乙烯-乙酸乙烯酯橡胶(EVM)或乙烯-乙酸乙烯酯共聚物(EVA)的胶料t90有所延长.加入α-蒎烯树脂,马来酸酐接枝EPDM(EPDM-g-MAH)、二甲苯树脂或热塑性酚醛树脂的胶料t90总体变化不大;采用α-蒎烯树脂、EPDM-g-MAH、二甲苯树脂或热塑性酚醛树脂作相容剂,并用胶中两相的相容性改善.硫化胶物理性能和耐热空气老化性能良好.     

几种加工助剂对ABS木塑复合材料性能的影响

研究了几种加工助剂对丙烯腈-丁二烯-苯乙烯三元共聚物(ABS)基木塑复合材料(WPC)力学性能和加工性能的影响,并用扫描电子显微镜(SEM)分析了复合材料拉伸断面的微观形貌。结果表明:RX-80(二甲苯甲醛树脂酯化后的大分子酯类混合物)和ACR(丙烯酸酯类共聚物)能显著提高复合材料的力学性能;添加腰果壳油树脂(CNSL)和WB-16(钙皂和饱和脂肪酸酰胺混合物)复合材料的加工流动性得到了明显改善;RX-80、ACR、CNSL、WB-16在复合材料中具有增容剂和加工助剂的双重作用。     

加工助剂对PVC木塑复合材料性能的影响

研究了4种新型加工助剂对聚氯乙烯(PVC)木塑复合材料的加工特性和物理力学性能的影响,并利用扫描电子显微镜(SEM)研究复合材料的冲击断面。结果表明,以不饱和芳香族碳氢化合物、脂肪烃树脂为主要组分的加工助剂,能够提高木粉在PVC基体中的分散性,改善木粉与PVC的相容性,从而明显提高PVC木塑材料的力学性能和加工性能;以钙皂和饱和脂肪酸酰胺混合物、脂肪醇和脂肪酸酯的混合物为主要组分的加工助剂,对木粉的分散性和复合材料的加工性能有一定的改善,但其用量较大时对复合材料的力学性能有不利影响。     

PVC用加工助剂及冲击改性剂

<正>1加工改性助剂1.1加工改性助剂的作用原理聚氯乙烯(PVC)熔体延展性差,易导致熔体破碎,PVC熔体松弛慢,易导致制品表面粗糙、无光泽及鲨鱼皮等。因此,PVC加工时往往需要加入加工助剂,以改善其熔体缺陷。加工助剂为可以改善树脂加工性能的助剂,其主要作用方式有三种:促进树脂熔融、改善熔体流变性能及赋予润滑功能。①促进树脂熔融:PVC树脂在加热的状态下,在一定的剪切力作用下熔化     

聚丙烯加工稳定化技术最新进展

介绍了国外的抗氧剂、阻燃剂等加工助剂应用方面的研究成果,包括不同稳定剂对加工性能的影响以及各种稳定剂加入到聚丙烯树脂中的方法。     

预分散树脂对胶囊胶料性能的影响

研究非预分散和预分散反应型酚醛树脂在储存稳定性、对IIR胶料加工性能和物理性能影响等方面的差别,并探讨加工助剂莱茵新145A和莱茵散16对IIR／CR胶料性能的影响。结果表明,预分散硫化树脂的稳定性明显优于非预分散硫化树脂;加入预分散硫化树脂WBC-41,可减少胶料粘辊现象,提高胶料的均一性;加入莱茵新145A,可改善IIR／CR胶料的加工性能,提高硫化胶的拉伸强度和撕裂强度;加入莱茵散16,可提高IIR／CR胶料的流动性。     

塑料薄膜加工用塑料助剂的类别及应用

塑料助剂是为了改善树脂的加工性能和使用性能而加入的化学品。通常所用的塑料助剂有十几类，随着塑料品种的增多，用途的扩大和加工技术的不断进步，助剂的类型和品种也日益增多。     

几种加工助剂在聚丙烯基木塑复合材料中的应用对比

研究了3种加工助剂对聚丙烯(PP)基木塑复合材料物理力学性能和加工性能的影响,并利用扫描电子显微镜对复合材料的冲击断面进行了分析。结果表明,在一定用量范围内,芳香族碳氢化合物(S-105)和改性烷基酚醛树脂(TKM-M80)能够提高木粉在PP基体中的分散性,改善基体与木粉之间的相容性,从而提高PP基木塑复合材料的拉伸强度、冲击强度、弯曲强度、弯曲弹性模量和加工性能;脂肪醇和脂肪酸酯的混合物(Deoflow A)能够明显提高木粉在PP基体中的分散性和复合材料的加工性能,但用量较大时对复合材料的拉伸强度、弯曲强度和弯曲弹性模量有不利影响。     

加工助剂对全钢载重子午线轮胎胎面胶性能的影响

研究加工助剂FNP-795对全钢载重子午线轮胎胎面胶性能的影响,并与其它不同类型的加工助剂进行比较.结果表明,胎面胶配方中加入1 份FNP-795可以改善胶料的加工性能,延长焦烧时间,显著降低硫化胶的压缩生热和压缩永久变形,而硫化胶物理性能基本保持不变.不同类型的加工助剂对胎面胶性能的影响有较大的差别,加工助剂FNP-795有助于提高胶料的加工性能.     

Effect of epoxy resin on morphology and physical properties of PVC/organophilic montmorillonite nanocomposites

Poly(vinyl chloride)/organophilic montmorillonite (PVC/OMMT) nanocomposites were prepared by means of melt blending. A liquid epoxy resin was used to aid PVC chains in intercalating into silicate layers. The effects of the preparation methods and epoxy resin contents on the melt intercalation of PVC were investigated. The morphology development, mechanical properties and optical properties of the PVC/OMMT composites were tested as functions of epoxy resin content and OMMT content. Wide‐angle X‐ray diffraction, transmission electron microscopy and scanning electron microscopy were used to characterize the morphology of the resulting composites. After being pretreated by the epoxy resin, the OMMT layers were largely intercalated into the PVC matrix, and even exfoliated at high epoxy resin content. The addition of epoxy resin led to a decrease in optical clarity of the composites but improved the processing stability, as indicated by yellowness index and haze measurement. However, the optical clarity of the composites containing 4 phr of epoxy resin (PVC/E‐OMMT) was improved by increasing the OMMT content, as shown by light transmission. Both the tensile strength and notched Izod impact strength of the PVC/E‐OMMT composites reached their maximum values when the OMMT content was 0.5 phr and the epoxy resin content was 2 phr. With further increase of the OMMT content and the epoxy resin content, the tensile strength decreased but was still higher than that of original PVC. The method of addition of epoxy resin had little effect on the physical properties but mainly influenced the morphology of PVC/OMMT nanocomposites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2184–2191, 2003     

航空航天用高性能热固性树脂基体应用及研究进展

综述了航空航天领域中应用较多的环氧树脂、氰酸酯树脂、双马来酞亚胺树脂和反应性聚酞亚胺等热固性基体树脂材料的性能、应用以及研究方向,介绍了国内外的最新研究进展,并提出今后的研究重点,即提高基体树脂和增强纤维之间界面强度,提高复合材料的稳定性,降低材料的加工成型温度,减少成本,提高树脂基体的韧性等。     

超支化聚合物接枝纳米TiO_2/环氧树脂复合材料的制备与表征

利用偶联剂KH-550和超支化聚(胺-酯)(HBP)对纳米TiO2进行改性,并制备了纳米TiO2/环氧树脂(EP)复合材料。对复合材料的结构、力学性能、加工性能以及热性能进行了研究。研究结果表明,HBP接枝改性纳米TiO2(TiO2-g-HBP)的引入可明显提高复合材料的力学性能、热性能及加工性能;当w(TiO2-g-HBP)=1%时,复合材料的力学性能最好,其冲击强度和弯曲强度比纯EP分别提高了135.51%和22.98%;扫描电镜(SEM)结果显示,TiO2-g-HBP/EP复合材料由脆性断裂转变为韧性断裂。     

Effect of maleated polypropylene as a compatibilizer and hyperbranched polyester as a processing aid on polypropylene‐wood flour biocomposites

This work focused on two difficulties associated with preparation of polypropylene/wood flour (PP/WF) composites, viz. the compatibility of PP with WF and processing of the composites with high melt viscosity. Maleic anhydride‐grafted polypropylene (MAPP) was used in the preparation of PP composites to provide the compatibility between polymer and filler. Hyperbranched polyester (HBPE) was incorporated to check feasibility of it as a processing aid in the same. The PP/WF composites were formulated by melt compounding on a Brabender Plastograph EC. Blending effect of compatibilizer and processing aid HBPE on PP/WF biocomposites have been carried out on the basis of torque analysis, mechanical properties, morphology, and thermal stability. The investigation showed that HBPE improves the processibility of PP/WF composites than MAPP with respective to torque value. The mechanical and thermal properties slightly vary with change in relative proportion of MAPP and HBPE. J. VINYL ADDIT. TECHNOL., 24:179–184, 2018. © 2016 Society of Plastics Engineers     

ACS/Sb2O3复合材料制备方法对性能的影响

对采用原位悬浮聚合制备的苯乙烯一氯化聚乙烯一丙烯腈（ACS）共聚物／Sb2O3复合树脂、原位聚合苯乙烯一丙烯腈（SAN）共聚物／Sb2O3复合树脂与ACS树脂的共混物和ACS树脂／Sb2O3的直接共混物的力学性能和阻燃性能进行了研究比较。结果发现：原位聚合法制备的ACS／Sb2O3复合材料的性能优于其它两种方法制备的复合物；三种复合材料的冲击性能都劣于纯ACS材料；采用原位聚合方法，Sb2O3质量分数小于7％时，Sb2O3对复合材料有增强作用；当Sb2O3质量分数大于10％时，直接共混ACS／Sb2O3复合物的阻燃性能劣于其它两种方法制备的ACS／Sb203复合材料。     

基于含硅多芳炔化合物制备新型聚三唑树脂

以含硅多芳炔化合物(PSA)与1,3,5-三叠氮甲基-2,4,6-三甲基苯(TAMTMB)为原料,通过1,3-偶极环加成反应制备了新型含硅聚三唑树脂Si-PTA3,考察了树脂的流变性能、固化行为、热性能及单体配比对其热性能的影响。采用模压法制备了单向T700碳纤维增强的Si-PTA3树脂复合材料T700/Si-PTA3,测定了其力学性能。结果表明,Si-PTA3树脂具有良好的加工性能,可在80℃下固化,耐热性较好;炔基与叠氮基摩尔比为1.1:1.0时树脂固化物的热性能最好,玻璃化转变温度达334℃,在氮气中热失重5%时的温度达351℃;复合材料T700/Si-PTA3常温下的弯曲强度高于1670 MPa,250℃时弯曲强度保留率超过67%。     

增粘树脂对NR/BR并用胶性能的影响

研究了松香、古马隆、酚醛树脂、C5树脂及环氧树脂对NR/BR并用胶性能的影响,通过对胶料硫化特性、工艺性能及硫化胶物理机械性能的测试。试验结果表明,几种增粘树脂均具有软化增粘的作用,能降低胶料的门尼粘度,提高胶料的塑性,改善加工工艺性能,对胶料硫化特性影响不大;酚醛树脂能增加胶料的硬度和拉伸强度;加入C5树脂可以提高胶料的撕裂强度和耐磨性;环氧树脂的加入能缩短加工工序、降低混炼能耗,胶料的弹性最好。     

Effect of lactic acid chain length on thermomechanical properties of star‐LA‐xylitol resins and jute reinforced biocomposites

Star‐shaped bio‐based resins were synthesized by direct condensation of lactic acid (LA) with xylitol followed by end‐functionalizing of branches by methacrylic anhydride with three different LA chain lengths (3, 5 and 7). The thermomechanical and structural properties of the resins were characterized by ¹³C NMR, Fourier transform IR spectroscopy, rheometry, DSC, dynamic mechanical analysis (DMA), TGA and flexural and tensile tests. An evaluation of the effect of chain length on the synthesized resins showed that the resin with five LAs exhibited the most favorable thermomechanical properties. Also, the resin's glass transition temperature (103 °C) was substantially higher than that of the thermoplast PLA (ca 55 °C). The resin had low viscosity at its processing temperature (80 °C). The compatibility of the resin with natural fibers was investigated for biocomposite manufacturing. Finally, composites were produced from the n5‐resin (80 wt% fiber content) using jute fiber. The thermomechanical and morphological properties of the biocomposites were compared with jute‐PLA composites and a hybrid composite made of the impregnated jute fibers with n5 resin and PLA. SEM and DMA showed that the n5‐jute composites had better mechanical properties than the other composites produced. Inexpensive monomers, good thermomechanical properties and good processability of the n5 resin make the resin comparable with commercial unsaturated polyester resins. © 2017 Society of Chemical Industry