ZDMA/白炭黑填充HNBR的结构与性能

以甲基丙烯酸锌(ZDMA)/白炭黑填充氢化丁腈橡胶(HNBR),研究ZDMA/白炭黑并用比、硫化剂DCP用量及硫化时间对HNBR硫化胶结构和性能的影响。结果表明,在填料总量不变的前提下,随着白炭黑用量的增大,ZDMA/白炭黑填充HNBR硫化胶拉伸强度和压缩永久变形先减小后增大,填料分散性下降;随着硫化剂DCP用量的增大,ZDMA/白炭黑填充HNBR硫化胶物理性能和动态性能提高,填料分散性变好。当ZDMA/白炭黑并用比为10/30、硫化剂DCP用量为5～6份、一段硫化条件为160℃×45min、二段硫化条件为150℃×(9～12)h时,ZDMA/白炭黑填充HNBR硫化胶综合性能较好。     

新型硅烷偶联剂对溶聚丁苯橡胶力学性能的影响

采用自制的5种新型硅烷偶联剂作为白炭黑表面处理剂,对溶聚丁苯橡胶(SSBR)进行补强研究。考察了硅烷偶联剂用量、热混炼时间以及热混炼温度对SSBR硫化胶力学性能的影响,并与Si69、Si75处理后的白炭黑补强SSBR的力学性能进行了对比。结果表明,采用自制的5种新型硅烷偶联剂为白炭黑处理剂制备的补强SSBR硫化胶的拉断伸长率优于用Si69、Si75制备的SSBR硫化胶;采用Si1502为白炭黑处理剂制备的SSBR硫化胶的撕裂强度高于采用Si69、Si75为白炭黑处理剂的;采用Si1503和Si1504为白炭黑处理剂的补强硫化胶的撕裂性能与采用Si69、Si75为白炭黑处理剂的相当。采用Si69和Si75为白炭黑处理剂制备的硫化胶的适宜混炼温度在130~140℃,采用自制5种新型硅烷偶联剂为白炭黑处理剂制备的SSBR硫化胶的最适混炼温度均在120℃左右,大幅降低了胶料的混炼温度;采用Si69、Si75、Si1501、Si1502为白炭黑处理剂的补强SSBR胶料的最佳混炼时间为8 min,而采用Si1503、Si1504、Si1605为白炭黑处理剂的补强SSBR胶料的混炼时间则为10 min。     

白炭黑/天然橡胶湿法混炼共沉胶的性能研究

研究白炭黑/天然橡胶湿法混炼共沉胶的加工性能、物理性能和动态性能,并与传统干法混炼胶进行对比。结果表明:在湿法混炼共沉胶中增大白炭黑用量,胶料的焦烧时间和正硫化时间逐渐延长,硫化胶的拉伸强度逐渐增大,损耗因子略有减小,玻璃化温度升高;与干法混炼胶相比,湿法混炼共沉胶的正硫化时间延长,加工能耗大,生热低,硫化胶的物理性能和动态性能较好。扫描电镜分析显示,白炭黑在湿法混炼共沉胶中的分散性更好。     

白炭黑/NR湿法混炼共沉胶加工和动态性能研究

本文通过扫描电镜观察了白炭黑在湿法和干法混炼硫化胶中的分散,显示白炭黑在湿法混炼胶中分散性更好。研究了白炭黑的用量对白炭黑/NR湿法混炼共沉胶的加工和动态性能影响,与传统干法混炼胶作对比,结果表明,湿法混炼共沉胶中增加白炭黑用量,会延长硫化时间,粘性转矩增大,拉伸性能提高,玻璃化温度升高;湿法炼胶比干法炼胶的焦烧时间长,混炼胶加工中能耗大、自身生热小,硫化胶有较好的物理机械性能和动态性能。     

机械剪切再生热硫化硅橡胶的结构和性能

考察了机械剪切法制备的再生硅橡胶的结构和性能,采用FTIR、SEM、DMA表征了再生硅橡胶硫化胶和新硅橡胶硫化胶的结构,研究了硫化剂DBPMH和沉淀法白炭黑对再生硅橡胶力学性能的影响,以及沉淀法白炭黑对再生硅橡胶透光性的影响。结果表明,硅橡胶再生前后其化学结构没有明显变化,但分子链变短,且再生硅橡胶硫化胶中有明显的白炭黑团聚现象。硫化剂DBPMH用量增大会缩短再生硅橡胶的焦烧时间和正硫化时间,提高力学性能,二段硫化对进一步提升再生硅橡胶的力学性能效果明显。当沉淀法白炭黑用量为15份时,再生硅橡胶硫化胶的力学性能较好。随着沉淀法白炭黑用量的增大,再生硅橡胶硫化胶的透光性先提高后降低,当沉淀法白炭黑用量为15份时,再生硅橡胶硫化胶的透光性最好。     

GH型白炭黑在硅橡胶中的应用

ＧＨ型白炭黑对甲基乙烯基硅橡胶具有较高的补强作用。混炼时易分散，不脱辊或粘辊。选用１．３５份２，４－二氯过氧化苯甲酰作硫化胶综合性能较好。配方设计得当，可使其硫化胶具有较好的强伸性能和耐热老化，抗撕裂，耐电等性能及较低的压缩永久变形。这些性能均可达到与使用气相法２号白炭黑填充的硅橡相同的标准的要求。本材料可用于制造硅橡胶胶管，密封圈等制品。     

钢丝编织机铸钢线轴的研制

介绍钢丝编织机铸钢线轴的粘合胶配方设计和生产工艺。主体材料为NBR、补强剂为喷雾炭黑(用量90份)、硫化体系为硫化剂DCP／促进剂DM／促进剂DTDM(用量比1/2/3)体系、粘合体系为粘合剂RH／粘合剂RS／白炭黑(用量比3／2／10)体系的粘合胶粘合性能和物理性能较好。粘合胶在开炼机上混炼后与铸钢棘轮和线轮装模硫化，制得的线轴使用性能好、寿命长。     

环氧化低分子聚丁二烯改性白炭黑在SBR中的应用

研究环氧化低相对分子质量反式聚丁二烯(ELMTPB)改性白炭黑在SBR中的应用效果。结果表明，环氧度为10．6％的ELMTPB改性白炭黑填充SBR硫化胶的综合性能较好；硅烷偶联剂Si69改性白炭黑对SBR硫化胶性能的改善效果明显优于ELMTPB改性白炭黑，且Si69用量为8份时，硫化胶拉伸强度和撕裂强度较高；在ELMTPB／Si69并用比不超过4／4时，所得SBR硫化胶拉伸强度和拉断伸长率优于Si69改性白炭黑填充SBR硫化胶；当Si69用量为4份且并用12份ELMTPB时，所得SBR硫化胶性能最佳，表现在300％定伸应力提高28％，拉伸强度提高38％，且拉伸强度和拉断伸长率超过8份Si69改性白炭黑填充SBR硫化胶。     

白炭黑用量对MPU/PA12 TPV性能的影响

采用动态硫化方法制备混炼型聚氨酯橡胶(MPU)/聚十二内酰胺(PA12)热塑性硫化胶(TPV),通过控制橡胶相中白炭黑的用量,研究该TPV的相态、力学性能、耐老化性能和动态力学性能.研究发现,动态硫化时,随着白炭黑用量的增加,扭矩流变仪的最高扭矩上升,动态硫化速度基本不变;在本实验所用白炭黑用量范围内,随着白炭黑用量的...     

白炭黑湿法混炼母胶在全钢工程机械子午线 轮胎胎面胶中的应用

研究白炭黑湿法混炼母胶在全钢工程机械子午线轮胎胎面胶中的应用。结果表明：与传统白炭黑干法混炼胶和硫化胶相比,白炭黑湿法混炼母胶的混炼胶的混炼能耗和门尼粘度明显降低,硫化特性相差不大;硫化胶的硬度和拉伸性能相当,但耐磨、抗撕裂和抗切割性能提高,压缩生热和滚动阻力降低。采用白炭黑湿法混炼母胶的成品轮胎胎面胶的抗崩花掉块性能得到改善。     

恒温混炼工艺对白炭黑胎面胶性能的影响

研究恒温混炼工艺对白炭黑胎面胶性能的影响。结果表明:与原混炼工艺相比,采用恒温混炼工艺可使混炼效率提高5.25%,能耗降低4.41%;胶料的门尼粘度略微提高,焦烧时间略微缩短,但完全可以满足生产工艺要求;硫化胶的300%定伸应力、拉伸强度、撕裂强度和磨耗性能均有明显改善,滚动阻力和动态生热降低。     

Effects of different interphases on the mechanical properties of cured silanized silica‐filled styrene–butadiene/polybutadiene rubber blends for use in passenger car tire treads

Polybutadiene (BR) and styrene–butadiene (SBR) rubbers containing the same loading of precipitated silica nanofiller were prepared. The silica surfaces were pretreated with bis(3‐triethoxysilylpropyl) tetrasulfide to chemically bond the silica to the rubber. The rubber compounds were mixed together for different times and at different temperatures to produce SBR/BR blends. The mass fraction and composition values of the interphases in the blends were subsequently determined with modulated‐temperature differential scanning calorimetry. These properties changed substantially as a function of mixing temperature and mixing time. The hardness, tensile strength, elongation at break, stored energy density at break, tear strength, modulus, abrasion resistance, heat buildup, and loss tangent of the cured blends were measured over a wide range of test conditions. Elongation at break, stored energy density at break, tearing energy, and abrasion resistance benefited from increases in the mass fraction of the interphase. The remaining properties were influenced mainly by the filler loading and mixing time of the two rubber compounds. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

高强度硅橡胶混炼胶的制备

用用Ｚ浆捏合机，将端乙烯基硅橡胶，气相白炭黑及羟基硅氧烷进行混炼，制备了高强度硅橡胶混炼胶。在白炭黑用量为４０份时，混炼胶硫化胶的拉伸强度为１１．７ＭＰａ，撕裂强度为４９．７ｋＮ／ｍ。９份端乙烯基硅橡胶与１份普通甲基乙烯基硅橡胶并用制备的混炼胶，其撕裂强度高达５７．７ｋＮ／ｍ，实验所制得的混炼胶与国外同类产品物理机械性能相当。     

混炼工艺对绿色轮胎胎面胶性能的影响

研究混炼工艺对绿色轮胎胎面胶性能的影响。结果表明:恒温混炼温度为150℃时,随着恒温时间的延长,白炭黑粒子间的相互作用减弱,胶料的Payne效应减弱;混炼胶的t5和t10缩短,硫化速率增大;硫化胶的300%定伸应力、拉伸强度和拉断伸长率呈上升趋势;硫化胶的抗湿滑性能提高,滚动阻力减小。     

环氧化天然橡胶与聚丙烯共混的研究

对环氧化天然橡胶ＥＮＲ－５０与聚丙烯共混制备热塑性弹性体进行了研究。试验结果表明，选用硫黄给予体硫化体系、采用“母炼胶”二段混炼工艺，加入适量的相容剂及白炭黑，可制得力学性能较好（拉伸强度１５ＭＰａ、扯断伸长率５００％、撕裂强度８３ｋＮ·ｍ－１）、中等耐油的热塑性弹性体。透射电镜观察表明，加入相容剂及白炭黑能有效地改善共混物的界面状况，从而提高共混物的力学性能。     

Properties and preparation of thermoplastic polyurethane/silica hybrid using sol–gel process

A thermoplastic polyurethane elastomer/silica hybrid (TPU/SiO₂) was prepared using the sol–gel process. This work was undertaken to investigate the thermal and physical properties of this type of hybrid by employing different catalyst systems during sol–gel processing. Two types of catalyst systems including acetic acid (HOAc) and hydrochloric acid (HCl) were used to prepare sol particles. The mixing of the sol solution and TPU solution was then carried out to form a TPU/silica hybrid. Fourier transform IR spectra and dynamic mechanical properties were recorded to depict the enhanced interfacial interaction. Thermogravimetric analysis was used to determine the actual silica content forming in the hybrid and to evaluate the heat resistance of the hybrid. Mechanical properties such as the tensile strength and cutting strength were investigated at various concentrations of in situ silica. The tensile strength increased at all concentrations of silica. In contrast, the cutting strength decreased, probably because of a reduction of the energy dissipation from silica as physical crosslinks. The HOAc catalyzed system showed better optical properties than the HCl catalyzed system. The fracture surface was revealed through scanning electron microscopy to observe the degree of dispersion of SiO₂, which in turn confirmed the results for the optical and mechanical properties. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 1316–1325, 2005     

超细高活性矿物掺合料对UHPC水化和收缩性能的影响

本试验研究了超细高活性矿物掺合料(超细掺合料)与硅灰以单掺、复掺的方式制备超高性能混凝土(UHPC),分析了复掺不同掺量超细掺合料对UHPC的工作性、力学性能、水化热和收缩性能的影响。结果表明:UHPC流动性随超细掺合料掺量的增加而增加,跳桌流动度最高为275 mm;将超细掺合料与质量分数为10%的硅灰以复掺的方式制备UHPC时,随超细掺合料掺量的增加,UHPC抗折强度先增加后降低,抗压强度先增加后趋于平稳,最大抗折强度和抗压强度分别为25.9 MPa和150.0 MPa;超细掺合料与质量分数为10%的硅灰复掺制备的UHPC水化热随超细掺合料掺量增加,先增大后减小;复掺质量分数为10%的超细掺合料与质量分数为10%的硅灰制备的UHPC早期收缩量最小,比单掺质量分数为20%的硅灰制备的UHPC低50.92%。     

高硅灰酒糟基粉状活性炭成型及性能

以粉状白酒糟物理活化炭为原料,以羧甲基纤维素(CMC)、煤焦油和酒糟活性炭灰分碱处理溶出液为粘结剂,研究了高含Si灰生物质粉末活性炭的成型方法. 结果表明,单独以CMC和煤焦油作为粘结剂,在4.0 MPa成型压力下所制成型活性炭的侧压强度达120 N/cm,但其碘吸附能力低于400 mg/g. 利用酒糟基活性炭灰碱处理溶出液,仅添加少量CMC成型的活性炭达到相同侧压强度,吸附能力达600 mg/g以上,明显高于仅添加CMC或煤焦油成型的活性炭,以及原活性炭粉. 对成型活性炭进行了红外光谱、XRD及SEM表征,分析了其粘结机理.     

TEM,XPS and thermo-mechanical properties of novel sustainable hybrid coatings

This work contributes to the development of a new generation of protective coatings composed of organic–inorganic materials. A silica based hybrid film was used in this work as high performance materials. The silica sol–gel film reveals enhanced thermo-mechanical properties in comparison with the pure polymer film. Herein, we demonstrate the possibility of employing cheap SiO₂ as prospective nano-fillers for hybrid coatings with active thermo-mechanical properties. Organic–inorganic hybrid coatings based on polyimide and silica were synthesized through a simple physical mixing technique. 3,3′,4,4′-Biphenyltetracarboxylic dianhydride (BPDA), benzene-1,3-diamine (BDA), 3,3′-oxydianiline (ODA) and SiO₂, were used as precursors for the hybrid coatings. These hybrid coatings were deposited via spin coating onto a galvanized iron, aluminum and copper in order to study the adhesive strength. The effects induced by the silica content on the mechanical properties of the coated samples were investigated. The mechanical properties of hybrid composite were found to be enhanced compared to polyimide coating. The main objective was to observe potential improvements in the mechanical and thermal properties of PI–silica hybrid films. Morphology, and structural changes in the composite films were studied as well as adhesion and impact strength and these characteristics were compared with those of unreinforced polyimide films.     

Effects of fibre length and mixing routes on fibre reinforced shell for investment casting

Shell for investment casting is key in obtaining casting with high performances. In this study, carbon fibres were mixed with slurry, silica sol, and sanding materials to prepare fibre reinforced shell for investment casting. Suspension properties, slurry viscosity, and shell strength were all investigated. Failure surface of shell was observed by scanning electron microscopy (SEM). Results indicated that suspension percentage and viscosity of slurry containing fibre and silica sol were higher than those of fibre free slurry. The viscosity of slurry increased as carbon fibre length rose. Comparison of different mixing methods and fibre lengths revealed that addition of carbon fibre with 4?mm in length into silica sol under ultrasonic agitation yielded maximum bending strength of 3.97?MPa. SEM data illustrated that the longer fibres might increase bonding area, leading to increased shell strength.