聚合物包覆硫黄的应用研究

以全钢载重子午线轮胎带束层胶配方为例,对采用不同工艺制备的聚合物包覆硫黄进行应用研究。结果表明,在全钢载重子午线轮胎带束层胶中添加原位聚合法制备的聚合物包覆硫黄,胶料的加工安全性能、耐热老化性能和粘合性能较好,撕裂强度较高,压缩疲劳温升低,综合性能较好。     

清洁工艺不溶性硫黄在轮胎带束层胶中的应用

采用全钢载重子午线轮胎带束层胶配方,考察清洁工艺不溶性硫黄与普通工艺不溶性硫黄的性能。结果表明：与普通工艺不溶性硫黄相比,清洁工艺不溶性硫黄高热稳定性好,在胶料中的分散性好,抗喷霜效果好;胶料的加工性能和加工安全性能略好,撕裂强度稍大,耐热空气老化性能略好,老化前后与钢丝粘合性能较好,可以部分或全部替代国外同类产品使用。     

粘合增进剂AIR-101在全钢载重子午线轮胎胎体胶中的应用

研究粘合增进剂AIR-101在全钢载重子午线轮胎胎体胶中的应用。试验结果表明:以粘合增进剂AIR-101等量替代间苯二酚,同时减小癸酸钴用量和增大不溶性硫黄用量,可以保证胶料的加工安全性,对胶料的硫化特性和物理性能影响不大,能够提高硫化胶老化后的粘合性能和成品轮胎的耐久性能,降低原材料成本,减少环境污染。     

空气弹簧胶囊帘线与橡胶粘合性能的研究

探讨空气弹簧胶囊帘线与橡胶的粘合性能。结果表明,帘线与氯丁橡胶(CR)胶料粘合强度由大到小的顺序为锦纶、聚酯和芳纶;胶料与帘线粘合强度由大到小的顺序为天然橡胶(NR)胶料、硫黄调节型CR胶料和非硫黄调节型CR胶料;覆胶锦纶帘布和聚酯帘布耐屈挠脱层性能良好。     

硫黄与癸酸钴对轮胎胎体橡胶/钢丝粘合性能的影响

采用子午线轮胎胎体配方胶料,开发了一种橡胶/钢丝帘线动态粘合性能的测试方法,考察了硫黄与癸酸钴对橡胶/钢丝动静态粘合性能的影响。结果表明,随着硫黄用量的增大,动静态粘合性能均呈现出先增大后减小的趋势。经20万次拉伸屈挠疲劳试验之后,硫黄用量少的胶料抽出力升高,反之则降低,与力学性能和动态力学性能相关性不大;癸酸钴能显著提高橡胶/钢丝帘线的动静态粘合性能,癸酸钴用量为2份时动态粘合性能最佳,与胶料的力学性能和动态力学性能有较好的相关性,撕裂强度较高,滞后性能较低,动态粘合性能好。     

包覆硫黄在全钢载重子午线轮胎胎体胶中的应用

研究包覆硫黄等量替代不溶性硫黄HD OT20在全钢载重子午线轮胎胎体胶中的应用。结果表明:包覆硫黄的热稳定性以及在胶料中的分散性、抗喷霜性能与不溶性硫黄HD OT20相近;在胎体胶中采用包覆硫黄等量替代不溶性硫黄HD OT20,胶料的综合性能相当,且各项工艺性能良好,均未发生喷霜现象,满足现场生产工艺标准要求。     

连续法不溶性硫黄在钢丝粘合胶料中的应用研究

研究连续法不溶性硫黄在钢丝粘合胶料中的应用。结果表明,与间歇法不溶性硫黄相比,连续法不溶性硫黄的粒径较小,在橡胶基体中分散更均匀,胶料的硫化特性和物理性能相当,粘合性能更好,生热更低。连续法工艺路线符合不溶性硫黄未来发展方向。     

高温下不溶性硫黄稳定性的测定方法

高温下不溶性硫黄稳定性的测定方法刘文英肖秀梅（桦林集团有限责任公司１５７０３２）硫黄是生产轮胎的重要原材料之一,使用可溶性硫黄,胶料易喷硫且粘合性能较差,而采用不溶性硫黄则可改善胶料的粘合性能。但是,不溶性硫黄的性质不稳定,易转变为可溶性硫黄,因此测...     

过氧化物与硫黄共硫化氢化丁腈橡胶的性能研究

研究过氧化物/硫黄复合硫化体系对氢化丁腈橡胶(HNBR)性能的影响。结果表明:随着硫化剂DCP用量的增大,胶料的焦烧时间缩短,硫化速度加快,硫化胶的100%定伸应力增大,压缩永久变形减小,耐热老化性能提高;随着硫黄用量的增大,胶料的硫化速度加快,硫化胶的粘合性能提高;促进剂CZ用量对HNBR胶料性能的影响不大;当硫化剂DCP/硫黄/促进剂CZ用量比为7/0.5/1时,HNBR胶料的综合性能最佳。     

综合促进剂DB在三元乙丙橡胶中的应用

试验研究综合促进剂DB和硫黄对三元乙丙橡胶(EPDM)胶料性能的影响。结果表明:综合促进剂DB应用在EPDM胶管配方中,胶料具有优异的耐热老化性能,不会与聚酯线发生胺解反应,能够延长胶管的使用寿命;综合促进剂DB应用在EPDM模压制品配方中,硫化速度适中,胶料易于流动和分散,有利于胶料与金属骨架材料粘合,提高剥离强度。     

Full characterization for material constants of a promising KNN-based lead-free piezoelectric ceramic

Potassium-sodium niobate (K_1-xNa_xNbO₃, referred to as KNN) solid solutions, which are an important type of lead-free piezoelectric materials possessing environmentally friendly features, good piezoelectric response and high Curie temperature, have attracted considerable attention in replacing lead-based ceramics. In order to promote the application of KNN-based ceramics in piezoelectric devices, we characterized a complete set of material constants of a high performance KNN-based ceramic, that is 0.965(K_0.48Na_0.52) (Nb_0.96Sb_0.04)O₃-0.035Bi_0.5Na_0.5Zr_0.15Hf_0.75O₃ (KNNS-BNZH), whose Curie temperature is 235 °C, piezoelectric coefficient d₃₃ is 380 pC/N and electromechanical coupling factor k₃₃ is 70%. These results will benefit the design of piezoelectric transducers and actuators using lead-free piezoelectric ceramics.     

High magnetic and ferroelectric properties of BZT-LSM multiferroic composites at room temperature

In this research, the effects of La_0.7Sr_0.3MnO₃ additive on the phase evolution, microstructure, dielectric, ferroelectric and magnetic properties of BaZr_0.07Ti_0.93O₃ ceramics were systematically investigated. The (BaZr_0.07Ti_0.93O₃)/x(La_0.7Sr_0.3MnO₃) or BZT/xLSM (where x?=?0, 5, 10 and 20?mol%) ceramics were prepared via a solid state reaction method. A pure perovskite phase is observed for the samples of x?≤?10?mol%. The M-H hysteresis loops also show an improvement in the magnetic behavior for higher LSM content samples as well as the modified ferroelectric properties. However, the 5?mol% sample exhibited the optimum ferroelectric and ferromagnetic properties with remnant magnetization (M_r) and remanent polarization (P_r) of 2.38?emu/g and 10.5?µC/cm², respectively. The dielectric-temperature curves show that the two phase-transition temperatures as observed for the unmodified BZT ceramic merges into a single phase-transition temperature for the 5?mol% sample and then become flat curves for the 10?mol% sample. In addition, the mechanical properties i.e. Knoop hardness and Young's modulus values increase with increasing LSM content, where Knoop hardness and Young's modulus values for the 20?mol% sample are increased by ~ 45% and ~ 104%, respectively, as compared to the unmodified sample.     

Mechanical,dielectric, and thermal properties of fluorosilicone rubber composites filled with silica/multiwall carbon nanotube hybrid fillers

In this work, hybrid fillers consist of modified silica (SiO₂) and multiwalled carbon nanotube (MWCNT) were used to improve the mechanical, dielectric, and thermal properties of fluorosilicone (FSR) composites via a direct mechanical mixing method. With the increase of CNT loading in SiO₂/CNT hybrid loading ratio, the tensile properties, dielectric constant, electrical conductivity, and thermal properties all increase without a sharp sacrifice of flexibility. The dielectric constant of FSR-S15/C5 achieved 7,370 @1 kHz, which is about four orders of the FSR-S20, and the dielectric loss remains as low as 0.676 @1 kHz. Therefore, the linkage of SiO₂ and FSR chains not only enhances the interfacial interaction between the fillers and FSR matrix but also decreases the agglomeration of the fillers in matrix. What is more, modified SiO₂ and CNT were designed as the effective hybrid filler to improve the performance of the polymeric matrix through synergic effect.     

PVDF piezoelectric voltage coefficient in situ measurements as a function of applied stress

Direct piezoelectric g₃₁ voltage coefficient was measured in situ as a function of applied tensile stress for films of polyvinylidene fluoride (PVDF). Measurements were performed under quasi‐static conditions with applied strain rates of 0.5–1.5 mm/min for strains up to 12%. Open‐circuit voltage was measured with a contact‐less electrostatic voltmeter. Obtained results show a strong dependence of the g₃₁ coefficient of mono‐oriented PVDF films on the applied stress, with a maximum value of the coefficient in the transition region between elastic and plastic deformation zones. The effect of sample geometry on the apparent g₃₁ coefficient is shown and discussed. The anisotropy of the piezoelectric effect is studied by means of g₃₁ and g₃₂ measurements. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43248.     

Investigation of dielectric and piezoelectric properties in aliovalent Eu3+-modified Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramics

Rare earth (Eu³⁺)-modified Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ (PMN-PT) polycrystalline ferroelectric ceramics were fabricated by high-temperature solid-state sintering, the phase structure, dielectric and piezoelectric properties were investigated. Eu³⁺ addition was found to significantly improve dielectric and piezoelectric properties of PMN-PT, where the optimized properties were achieved for the composition of 2.5 mol%Eu: 0.72PMN-0.28PT, with the piezoelectric d₃₃ = 1420 pC/N, dielectric ε_r = 12 200 and electromechanical k₃₃ = 0.78, respectively. All these results indicate that the Eu³⁺-doped PMN-PT ceramics are promising candidates for high-performance room-temperature piezoelectric devices.     

The effect of the Zn/Sn ratio on the formation of single phase kesterite Cu2ZnSnS4 solar cell material

The effect of the Zn/Sn ratio in the solution on the properties of Cu₂ZnSnS₄ films prepared by sol-gel method has been investigated. As the Zn/Sn ratio in the solution increases to a certain value, a pure single phase kesterite CZTS is obtained and confirmed by XRD, XPS and Raman. Through controlling the Zn/Sn ratio in the solution, secondary phases such as SnO₂ can be avoided and an optimal condition for single phase kesterite CZTS can be achieved. Surface SEM images of the CZTS films are investigated and the optical band gap of the optimized CZTS film is found to be 1.23 eV.     

Modification of chitosan-Fe3O4 microspheres with isophorone diisocyanate and formation of polyurethane/mchitosan-Fe3O4 antimicrobial polymer

Polyurethane/modified chitosan-Fe₃O₄ (PU/mCS-Fe₃O₄) nanocomposites were prepared by incorporating chitosan-Fe₃O₄ (CS-Fe₃O₄) into PU through chemical grafting using isophorone diisocyante (IPDI). The isocyanate group of IPDI was introduced on the surface of CS-Fe₃O₄ nanocomposites. The chemical functionalities of the CS-Fe₃O₄ and mCS-Fe₃O₄ were verified by Fourier-transform infrared and X-ray diffraction. The structure and properties were confirmed by scanning electron microscope, vibrating sample magnetometer, thermogravimetric analysis, atomic force microscope, and tensile testing. The experimental results indicate that thermal stability, tensile strength, and storage modulus of nanocomposites were improved with the increasing content of mCS-Fe₃O₄. Meanwhile, PU/mCS-Fe₃O₄ nanocomposites have less cytotoxicity and good antibacterial activities againstEscherichia coli and Staphylococcus aureus.     

Synthesis,properties, and dyeing application of nonionic waterborne polyurethanes with different chain length of ethyldiamines as the chain extender

This study deals with the synthesis of some nonionic waterborne polyurethanes (PUs), using ethyldiamines of different chain length, such as ethylenediamine (EDA) and diethyltriamine (DETA), as the chain extender in the reaction, and examines the thermal properties, mechanical properties, and dyeing properties of the PU products and their blends. As far as each PU by itself is concerned, we found that the T_g of the one made with DETA is the highest, followed by that with EDA, and the one with 1,4‐butanediol (1,4‐BD) is the lowest. The PU made with 1,4‐BD as the chain extender has no T_m, while the two others, using diamines as chain extenders, have a clear T_m, the one with DETA being higher than that with EDA. However, the enthalpy data are just the opposite. The tensile strengths of the two PUs, made with diamines as the chain extender, are larger than that made with 1,4‐BD, but their respective elongation properties are just the opposite. A comparison within PUs made with diamines showed that the one made with EDA is greater in both strength and elongation categories than that made with DETA. However, the one made with DETA is far superior to both of those made with 1,4‐BD and EDA in their dye‐exhaustion ratio, color yield (K/S), fixation rate, and color fastness. In respect to the various PU mixtures that we examined, we found that both PUs synthesized with EDA or DETA as the chain extender would have their T_g's greatly increased by blending in some PU made using 1,4‐BD as the chain extender. Among them, in particular, a blend of PU, made separately with DETA and 1, 4‐BD as the chain extender, showed great improvements in both tensile strength and elongation and also demonstrated better dyeability. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2824–2833, 2003     

铅酸蓄电池用胶黏剂性能对比

为了解决阀控密封铅酸蓄电池的密封问题，通过对AB胶、3114AA、3114C的机械性能、化学性能、物理性能的对比实验，认为：AB胶在对ABS的粘接强度、固化速度方面都要优于3114AA和3114C，同时它的价格也便宜，因此，我们选用AB胶作电池盖与槽密封的胶黏剂；而3114AA、3114C在对金属铅的粘接强度、耐硫酸腐蚀方面都优于AB胶，同时3114AA较3114C具有固化时间更短、对ABS的粘接强度更高、耐硫酸腐蚀能力更强、可以常温固化等优点，因此，我们就用3114AA作电池极柱密封的胶黏剂。     

瓶罐玻璃生产关键工艺性能测量方法与应用

综述了瓶罐玻璃生产制备过程中的关键工艺性能的测量表征方法和适用的仪器设备。涉及的关键工艺性能主要包括熔解特性、熔体特性和温黏特性等。熔解特性的分析包括原料成分分析、粒度分析、熔化均匀性分析、澄清分析等;熔体特性的测量包括表面张力测量、高温电阻率测量、羟基含量测量等;温黏特性测量主要包括高温黏度(熔融温度T_m、工作点T_w、液相线T_L)测量、中温黏度(软化点T_s)测量、低温黏度(膨胀软化点T_d、退火点T_a、转变点T_g和应变点T_st等)测量。上述工艺性能精确测量和表征,对制备高质量瓶罐玻璃制品具有重要意义。