高强度难燃型输送带粘合剂的研制

选择了一种合适的预反应体系,采用9%自制接枝氯丁胶溶液与氯丁橡胶(A-90)进行配合制成的输送带粘合剂,具有粘接强度高、难燃等特点,在常温常压下固化30min后剥离强度达到145N/2.5cm,能够满足输送带快速粘接的要求。     

Fire‐resistant elastomers

The molecular design of semi‐inorganic polymers has produced polysilphenylene–siloxane and polyphosphazene elastomers having comparable fire safety to heat resistant engineering plastics. In flaming combustion a polyphosphazene rubber had a four times lower peak heat release rate than the polyurethane elastomer currently used in fire‐blocked aircraft seat cushions. The addition of expandable graphite flakes to polyurethane and polyphosphazene elastomers reduces their peak heat release rates by factors of seven and five, respectively. Published in 2003 by John Wiley & Sons, Ltd.     

煤矿用阻燃钢丝绳芯输送带的研制

介绍了煤矿用阻燃钢丝绳芯输送带的研制。主要包括骨架材料的选择、覆盖胶和粘合胶配方的设计以及实际生产工艺。经试验测试产品性能符合MT668-1997（煤矿用阻燃钢丝绳芯输送带技术条件》标准。     

耐热输送带的研制

以SBR为耐热输送带盖胶层主体材料,秋兰姆类、噻唑类、次磺酰胺类配合使用作硫化体系．中超、通用炭黑为补强体系,研制了耐热输送带。结果表明：加入TT（2份）、NOBs（1．5份）、N220＋N660（25份＋25份）．可大大提高SBR的耐热性能及热老化性能保持率．且生产工艺简单．方便实用;选用聚酯帆布为输送带骨架材料,使用证明,耐热带可在物料温度为200～300℃环境中使用。     

An effect of OMMT on the anti‐reversion in NR/CR blend system

The influence of dispersed organomodified montmorillonite (OMMT) on curing behaviors of natural rubber (NR)/chloroprene rubber (CR) blend was investigated. The preparing procedure includes premixed rubber individually with its additives and then the two components were blended according to gum weight ratio for NR to CR is 75/25. Sulfur was chosen as the vulcanizing agent, and the research on vulcanization was carried through the rotor‐Rheometer at 143°C. Transmission electron microscopy showed the dispersion of OMMT in the rubber blends and detected little OMMT migrated into the NR phase. The scorch time (t₁₀), optimum vulcanizing time (t₉₀), and reversion phenomenon were both measured by the curing curve; meanwhile, the crosslinking densities and mechanical properties were determined through equilibrium swelling‐method, magnetic resonance crosslink density spectrometer, and tensile tests. By comparing the test results, an interesting phenomenon was discovered and furthermore was verified that the addition of OMMT can obviously modify the reversion resistance of the binary blend. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Heat release rate in evaluation of conveyor belts in full-scale fire tests

The theoretical bases for calculation of heat release rate during burning of conveyor belts in the fire-testing gallery has been presented. Taking as an example the results of measurements of oxygen, carbon dioxide and monoxide content in the products of combustion of conveyor belts during the testing of their flammability in the full-scale fire gallery, the possibility has been demonstrated for using the calculations of heat release rate in an assessment of conveyor belt flammability. The total quantity of heat released during the belt fire in the experimental gallery can provide the basis to develop a new method of testing as well as the criteria for assessment of fire resistance of the conveyor belts using oxygen consumption calorimetry. © 1997 John Wiley & Sons, Ltd.     

Adhesion degradation of rubber and steel insert for conveyor belts

The problem of degradation of rubber in conveyor belts is very important because they incorporate a lot of rubber and have a high value. In the paper we have analyzed the situation of rubber conveyor belts reinforced with metal insertions because it was found that they can sometimes be obsolete pretty fast due to the degradation of the connection between the metal insertion and the rubber matrix. The theoretical study performed followed modeling the bond between the metal insert and the rubber matrix and obtained a relationship for calculating the rate of degradation n _d of the connection between the metal insertion and the rubber matrix. The evolution in time of the degradation of the connection between the metal insertion and the rubber matrix has also been established, and this was carried out during 2.5?years of use of a conveyor belt type ST 3150. To analyze the degradation of the rubber from the conveyor belt, rubber hardness was determined for seven distinct points on the belt thickness at intervals of 0.5?years and was also determined at the same intervals of time the evolution of specific resistance of tearing of the metal insertion from the rubber matrix.     

High‐resolution thermogravimetry/coupled mass spectrometry analysis of flame‐retardant rubber

A bromobutyl rubber composition containing a variety of conventional flame retardants, such as Saytex (decabromodiphenyl oxide), Sb₂O₃, chlorinated paraffin wax, and polychloroprene rubber, was prepared and used to coat nylon 6 fabric in a laboratory‐coating device. An attempt was made to evaluate the decomposition profile, the evolved gases, and the kinetics of the decomposition process at a dynamic heating rate with high‐resolution thermogravimetric analysis (HR‐TGA). HR‐TGA was used with mass spectrometry for evolved gas analysis (EGA). The HR‐TGA results were compared with results from conventional thermogravimetric analysis (TGA) at a constant heating rate; the former offered sharp transitions, an economic timescale, and an accurate activation energy. The resolution optimization for stability analysis and the effect of its variation on the kinetic parameters offered better results for HR‐TGA than conventional TGA. A lifetime and temperature relationship was evaluated in HR‐TGA with Toop's method, and it was observed that the shelf life decreased sharply with temperature. The effluents HBr, HCl, Br ·, and Cl ·, generated between 210 and 496°C during EGA, were correlated with the thermal stability and fire‐retardancy behavior of the material. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2051–2057, 2003     

Fractal analysis of worn surfaces of ZnO whisker/natural rubber‐styrene butadiene rubber‐butyl rubber composites

The wear resistance of zinc oxide whisker (ZnOw)/natural rubber‐styrene butadiene rubber‐butyl rubber (NR‐SBR‐BR) composites showed that a tetra‐needle like ZnOw, which is treated by a coupling agent, improved the wear resistance of the rubber composites. The topography of the worn surfaces of the ZnOw/NR‐SBR‐BR composites was fractal, and the fractal dimension and abrasion loss decreased synchronously as the ZnOw content increased in the composites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 667–670, 2003     

填充剂、增塑剂对PVC轻型输送带覆盖胶性能的影响

研究了不同填充剂、增塑剂对PVC轻型输送带覆盖胶性能的影响。结果表明：白炭黑对PVC轻型输送带覆盖胶的力学性能、耐磨性能和硬度的影响最大;填充剂用量增加时,拉伸强度逐渐减小,冲击强度、硬度逐渐增大。与DOP,DCP和DOA相比,TXP的增塑效果最好;添加5份增塑剂时有反增塑现象发生．拉仲强度提高。在无毒输送带中应使用环保型环氧大豆油作为增塑剂。     

耐热输送带覆盖胶检验方式的探索与建议

<正>在GB/T20021-2005帆布芯耐热输送带标准中,采用GB/T3512-2001热空气加速老化和耐热试验与GB/T6031-1998硫化橡胶与热塑橡胶的硬度测定来检测覆盖胶的物理性能。试验的方式是硫化     

Friction and wear behavior of styrene butadiene rubber‐based composites reinforced with microwave‐devulcanized ground tire rubber

In this work, the tribological properties of a new material obtained by revulcanization with styrene butadiene rubber (SBR) and devulcanized ground tire rubber (GTR) were investigated. GTR was devulcanized using the microwave method at a constant power while varying the microwave exposure time. Devulcanized rubber (DV‐R) and untreated GTR were revulcanized by mixing with SBR at different rates (10, 30, 50 phr). To determine friction and wear characteristics of the samples, pin (ball) on disc and abrasion tests were conducted. Scanning electron microscopy (SEM) was employed to observe the worn surfaces of the composites to correlate the experimental test results to the wear mechanisms. All of these tests and experiments were performed on original vulcanized rubber samples for comparison. The composites exhibited different friction and wear behavior due to morphology, dispersion behavior and devulcanization functionalization of ground tire rubber. In general, DV‐R/SBR composites exhibited improvement in both mechanical and tribological properties. However, the enhanced compatibility of DV‐R resulting from the specific chemical coupling of DV‐R with SBR was crucial for the mechanical, friction and wear properties. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42419.     

Self‐heating properties of styrene‐butadiene rubber

Rubbers, including styrene‐butadiene rubber (SBR), are well known to be susceptible to self‐heating. SBR is used in a wide range of applications and is often produced in the form of a crumb which is then used to form the final product. The crumb may be transported and stored in large quantities. Self‐heating properties of a SBR crumb have been determined using standard oven methods. The results indicate that self‐heating is a real hazard for SBR crumb. The results are generally consistent with recent measurements by Clothier and Prichard (Combust. Flame 2003; 133 :207–210) for rubber tyre crumb. Copyright © 2005 John Wiley & Sons, Ltd.     

Dielectric behavior of aluminum hydroxide‐filled oil‐extended ethylene‐propylene‐diene‐monomer rubber composites in microwave fields

Oil‐extended ethylene‐propylene‐diene rubber composites were prepared with aluminum hydroxide (ATH) and high abrasion furnace carbon black. The dielectric properties at microwave frequencies of the samples were measured in the S (2–4 GHz) band using cavity perturbation technique. The thermal stability of the composites was studied using thermogravimetric analysis. The morphology of the composites was investigated by scanning electron microscopic studies. The fire retardancy of the composites was identified through the limiting oxygen index and horizontal burning test (UL94 HB). The dielectric permittivity, AC conductivity, and absorption coefficient of the highly ATH loaded systems are much greater than the unfilled and lower systems. At higher loading, the dielectric heating coefficient and skin depth were found to decrease significantly. The incorporation of ATH was found to improve the thermal stability and flame retardancy of EPDM. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers     

Use of ground pistachio shell as alternative filler in natural rubber/styrene–butadiene rubber‐based rubber compounds

Bio‐based polymers and fillers draw a significant interest. Focus of this work is to use ground pistachio shell as alternative filler in a model natural rubber/styrene–butadiene rubber‐based conveyor belt compound. Compounds were prepared using a laboratory two‐roll mill by partial replacing of carbon black with pistachio shell. Cure characteristics, mechanical, thermal, morphological, and abrasion properties of pistachio shell containing vulcanizates have been studied. Increasing pistachio shell loading causes lower cure extent and lower tensile strength. However, abrasion resistance is significantly improved by incorporation of pistachio shell. Benefits of using pistachio shell as filler may include producing low price, environmentally friendly, and high abrasion resistant vulcanizates when some loses in tensile properties can be tolerated. POLYM. COMPOS., 35:245–252, 2014. © 2013 Society of Plastics Engineers     

Improvement of properties of silica‐filled natural rubber compounds using polychloroprene

Because silica has strong filler–filler interactions, a silica‐filled rubber compound is characterized by a poor dispersion of the filler. Properties of silica‐filled natural rubber (NR) compounds were improved using polychloroprene (chloroprene rubber [CR]). The bound rubber content of the compound increases and the filler dispersion is also improved by adding CR to the compound. Physical properties such as modulus, tensile strength, abrasion, and crack resistance are improved by adding CR. Elongation at break of the vulcanizates containing CR is longer than that of the vulcanizate without CR, although crosslink density of the former is higher than that of the latter. The improved physical properties are attributed to the good dispersion of silica by adding CR. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2609–2616, 2002     

Preparation of sulfur‐modified powdered polychloroprene rubber by inverse coagulation

Sulfur‐modified powdered polychloroprene rubber (PCR‐121) was prepared by inverse coagulation. A new coating agent (SN) was developed that could generate in situ the coating layer by inverse coagulation. The results show that this is a low‐cost, stable technology for the production of powdered rubber with a very low coating agent content. A powdering model based on the liquid–liquid stirring theory of noncoalescing, liquid–liquid dispersion was proven with uniform design testing. According to this model, the mass fraction of medium‐scale particles (1–3 mm) was only related to the agitation speed in the experimental range. Scanning electron microscopy (SEM) analysis showed that the PCR‐121 particles were single continuous particles coagulated from single chloroprene rubber latex drops. Energy spectrum analysis showed that a layer with higher Ca content was coated at the surface of PCR‐121 particles, which made PCR‐121 a free‐flowing powdered rubber. The results show that the variation of Mooney viscosity (ML₁₊₄ 100°C) from 30 to 130 had no obvious effect on the mechanical properties of PCR‐121. Compared with bale CR121, PCR‐121 had better mechanical properties. SEM analysis and energy spectrum analysis on the tensile fracture surfaces showed that the dispersion of compounding agents in PCR‐121 was better than that in bale CR121, which resulted in better mechanical properties in PCR‐121. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2109–2115, 2005     

“桑塔纳”轿车配套用传动胶带

作者以氯丁橡胶为主要胶种，辅以适当的填充剂或软化剂，并以玻璃纤维为骨架材料、尼龙弹性布作为外包布开发出用同步带，产品达到行程１４多万公里的性能指标，得到大众公司的认可。     

The combination of expandable graphite,organic montmorillonite,and magnesium hydrate as fire‐retardant additives for ethylene–propylene–diene monomer/chloroprene rubber foams

The fire retardancy and flame‐retardant mechanism of expandable graphite (EG), organic montmorillonite (OMMT), and magnesium hydrate (MH) in ethylene‐propylene‐diene monomer/chloroprene rubber (EPDM/CR) foams were investigated. The results indicated that the combination of EG and OMMT remarkably improved the fire‐retardant property compared to the control samples, and better fireproof performance was achieved when MH was used as the third coretardant unit. The structure of the obtained EPDM/CR/OMMT composites was characterized by X‐ray diffraction, and the results showed that the composites had an intercalated nanostructure. The limiting oxygen index, vertical burning test, and cone calorimeter test results showed that the LOI values and UL‐94 rating increased while the second peak of the heat release rates (HRR) decreased within the EG/OMMT system. In particular, the second pHRR disappeared when the EG/OMMT/MH system was used as a flame retardant. Moreover, the results of thermogravimetric analysis showed that the combination of EG and OMMT reduced the thermal‐degradation rates and mass‐loss percentages. Furthermore, observation by scanning electron microscopy revealed that EG and OMMT left over after combustion formed a complete, compact, and rigid charred layer with a mosaic structure of expanded graphite embedded in cortical‐honeycomb layers of OMMT. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44929.     

In‐situ polymerized phenolic resin for reinforcement of chloroprene and ethylene–propylene rubber vulcanizates

Phenolic resin (PF) was incorporated into rubbers by in situ polymerization at the vulcanization conditions of rubbers. The PF with a localized three‐dimensional network structure was formed in chloroprene rubber (CR), whereas the fabric PF was formed in ethylene–propylene rubber (EPDM). The study results showed that the PF phase was effective on reinforcing these rubbers. Depending on the morphologies of the formed PF phases, various rubber properties could be significantly enhanced. In the case of CR rubber, the tensile strength, tear strength, and modulus could be considerably enhanced, but the elongation and resilience properties were limitedly affected by PF addition. For EPDM rubber, all mechanical properties were improved, particularly the elongation, about 26% increase. The substantial improvements of mechanical properties of CR and EPDM rubbers were attributed to their morphology, high flexibility, moderate stiffness, and excellent bonding with rubber matrix. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009