氯醚橡胶／氟橡胶共混物性能的研究

初步研究了具有不同共混比的氟橡胶（FKM）／氯醚橡胶（CO）共混物的硫化特性、物理机械性能、耐老化性能和压缩永久变形性能。结果表明：CO用量少于20份时,共混胶拉伸强度、100％定仲应力及压缩永久变形性能与纯FKM相当;当CO用量为20-40份时．共混胶拉伸强度和压缩永久变形性能均急剧下降;当用量高于40份时,趋于缓慢。FKM／CO共混胶耐老化性能保持率达到85％。     

TCY/TMTD硫化体系对CO/ECO共混物性能的影响

研究了三聚硫氰酸（TCY）/二硫化四甲基秋兰姆（TMTD）复合硫化体系对CO/ECO共混物的力学性能、耐热老化性能和高温压缩永久变形性能的影响。结果表明：适当的TCY用量可以获得较好力学性能的CO/ECO共混胶。增加TCY用量可以显著提高共混胶的耐热老化性能和高温压缩永久变形性能;而增加TMTD用量会导致CO/ECO共混胶耐热老化性能和高温压缩永久变形性能下降;二段硫化可以降低共混胶的压缩永久变形。     

二段硫化的均聚型/共聚型氯醚共混胶的性能

研究了二段硫化对均聚型(CO)／共聚型(ECO)氯醚共混胶的力学性能以及高温压缩永久变形的影响：结果表明，采用NA-22硫化体系硫化的CO／ECO共混胶，在合适的二段硫化条件下，可增加硫化胶的拉伸强度，但降低了其扯断伸长认；而采用TCY硫化的共混胶．二段硫化后，硫化胶的拉伸强度基本不变，扯断伸长率减小，二段硫化能明显减少CO／ECO共混胶的高温压缩永久变形，而且在一定范围内．二段硫化时间的延长有利于减少硫化胶的高温压缩永久变形。     

氟橡胶/PVC共混物性能研究

采用聚氯乙烯树脂(PVC)共混改性氟橡胶(FKM)。通过万能材料试验机、阿克隆磨耗仪等考察了二段硫化条件、FKM/PVC共混质量比和增容剂DCP对硫化胶的力学性能、耐磨、耐油、耐酸碱等性能的影响。结果表明,二次硫化温度为160℃、硫化时间为8 h时,共混胶具有较好的物理机械性能;FKM/PVC质量比为80/20时,可以得到综合性能较好的共混胶;DCP用量为1 phr时,增容效果最佳。     

硫化体系对CO/ECO共混胶压缩永久变形的影响

研究了不同硫化体系对CO/ECO共混胶的硫化特性，高温压缩交变形的影响。结果表明，采用三嗪类衍生物硫化体系的CO/ECO共混胶高温压缩永久变形较小，增加硫化剂Na-22或TCY的用量或者对胶料进行二次硫化均能减小胶料高温压缩永久变形。在适当的二次硫化条件下。加入适量的TMTD能减小Na-22硫化的共混胶高温压缩永久变形，TMTD用量过多则增大共混胶高温压缩永久变形，在TCY硫化体系中加入TMTD则使得共混胶高温压缩永久变形增加。     

ACM/FKM并用胶的性能研究

研究了不同并用比的氟橡胶和丙烯酸酯橡胶并用胶的硫化特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能.结果表明: ACM与FKM可以很好地混合并各自交联,从而制备综合性能优异的并用胶;并用比为30/70时,ACM/FKM并用胶综合性能较佳,二段硫化后其物理机械性能和压缩永久变形性能均明显改善,且耐热空气老化性能优异;热重分析结果表明,并用胶具有很好的热稳定性.     

ACM/FKM并用胶的性能研究

研究了不同并用比的氟橡胶（FKM）和丙烯酸酯橡胶（ACM）并用胶的硫变特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能。实验结果表明：ACM与FKM可以很好地混合并且各自交联,从而制备综合性能优异的并用胶;并用比为30/70的ACM/FKM并用胶综合性能较佳,二段硫化后其物理机械性能和压缩永久变形性能明显改善,且耐热空气老化性能优异;热重分析结果表明,并用胶有很好的热稳定性。     

不同硫化体系对氟橡胶/氯醚橡胶共混物性能的影响

在固定氟橡胶(FKM)硫化体系(双酚AF)的条件下,研究了改变氯醚橡胶(CO)硫化体系对FKM/CO共混物硫化特性以及硫化胶的物理机械性能、耐老化性能、耐油性能及热稳定性的影响。结果表明,采用促进剂NA-22/MgO体系时,FKM/CO共混物具有较好的硫化特性,硫化胶的综合物理机械性能较好,但耐老化性能仍需改善;采用促进剂TCY/MgO/CaCO3体系时需要较长的硫化时间,且焦烧性能较差;并用促进剂TMTD或促进剂DTDM后混炼胶的交联效果变差;FKM/CO共混物具有较好的热稳定性且热失重起始温度高于300℃。     

硫化条件对FKM/MVQ并用胶性能的影响

采用机械共混法制备氟橡胶(FKM)/甲基乙烯基硅橡胶(MVQ)并用胶,研究硫化条件对FKM/MVQ并用胶性能的影响。结果表明,随着一段硫化温度的升高,FKM/MVQ并用胶t10和t90缩短,邵尔A型硬度和撕裂强度变化不大,定伸应力和拉伸强度先增大后减小;当一段硫化条件为165℃×t90、二段硫化条件为250℃×4h时,FKM/MVQ并用胶的综合物理性能较好。     

三种不同硫化助剂对MVQ/EPDM共混胶性能的影响

研究了3种硫化助剂对MVQ/EPDM共混胶硫化特性、力学性能、耐热老化性能、高温压缩永久变形性能及动态力学性能的影响。结果表明,添加硫化助剂HVA—2的共混胶焦烧时间和正硫化时间均明显缩短;添加硫化助剂丁羟胶和TAIC的共混胶焦烧时间和正硫化时间均变化不大;添加硫化助剂丁羟胶的共混胶具有最好力学性能、耐热老化性能和压缩永久变形性能,其玻璃化温度也比空白样的低近3℃。     

氢化丁腈橡胶配合体系研究

研究了硫化剂用量、不同种类的填料、增塑剂和防老剂对氢化丁腈（HNBR）胶料性能的影响。结果表明：当DCP/TAIC的比例为4:3时,硫化胶的综合力学性能最佳。N774补强HNBR,可以兼顾低的压缩永久变形和良好的力学性能。使用防老剂ZMMBI/防445的HNBR硫化胶压缩永久变形小,耐老化性能优良。增塑剂TP-95对降低HNBR硫化胶Tg的效果最为显著。     

Mechanochemical preparation of devulcanized ground fluoroelastomers for the enhancement of the thermal stability of nitrile–butadiene rubber vulcanizates

Mechanochemically devulcanized ground fluoroelastomer (FKM) was used as a low‐cost functional additive for the enhancement of the thermal stability of nitrile–butadiene rubber (NBR) vulcanizates. Without the use of any chemicals, the stress‐induced mechanochemical devulcanization of ground FKM was achieved through solid‐state mechanochemical milling at ambient temperature. The sol fraction of the ground FKM was increased from its original 1.4 to 19.8% after milling; this confirmed the realization of the mechanochemical devulcanization of FKM. Moreover, the oxygen‐containing polar groups on the surface of the mechanochemically milled FKM benefitted its interfacial adhesion with the polar NBR matrix. The curing characteristics and mechanical properties of the devulcanized, FKM‐filled NBR vulcanizates were investigated and compared with those of the untreated FKM‐filled NBR vulcanizates. The results show that the mechanical properties of the devulcanized FKM‐filled NBR vulcanizates were much better than those of the untreated FKM‐filled NBR vulcanizates. The presence of the reclaimed FKM significantly increased the onset degradation temperature of the NBR vulcanizates as a result of the improved polymer–filler interaction, uniform dispersion, and high thermal stability of the reclaimed FKM. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Fly‐ash particles and precipitated silica as fillers in rubbers. II. Effects of silica content and Si69‐treatment in natural rubber/styrene–butadiene rubber vulcanizates

This article explored the possibility of using silica from fly‐ash particles as reinforcement in natural rubber/styrene–butadiene rubber (NR/SBR) vulcanizates. For a given silica content, the NR : SBR blend ratio of 1 : 1 (or 50 : 50 phr) exhibited the optimum mechanical properties for fly‐ash filled NR/SBR blend system. When using untreated silica from fly‐ash, the cure time and mechanical properties of the NR/SBR vulcanizates decreased with increasing silica content. The improvement of the mechanical properties was achieved by addition of Si69, the recommended dosage being 2.0 wt % of silica content. The optimum tensile strength of the silica filled NR/SBR vulcanizates was peaked at 10–20 phr silica contents. Most mechanical properties increased with thermal ageing. The addition of silica from fly‐ash in the NR/SBR vulcanizates was found to improve the elastic behavior, including compression set and resilience, as compared with that of commercial precipitated silica. Taking mechanical properties into account, the recommended dosage for the silica (FASi) content was 20 phr. For more effective reinforcement, the silica from fly‐ash particles had to be chemically treated with 2.0 wt % Si69. It was convincing that silica from fly‐ash particles could be used to replace commercial silica as reinforcement in NR/SBR vulcanizates for cost‐saving and environment benefits. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

Surface treatment of fluorinated rubber with triazine thiols and their properties

Fluorinated (FKM) vulcanizates were treated by immersing in an aqueous solution of triazine thiols, NaOH, and onium salts for 15–60 min at 50–95°C (W-Method). Treated FKM vulcanizates further were postcured in an air oven for 20 h at 200°C to complete the reaction. The onium salt of triazine thiols were found to be formed by a reaction among the triazine thiols, NaOH, and onium salts and to act as cross-linking agents to the surface of FKM vulcanizates. In the acetone solution of onium salts of triazine thiols, FKM vulcanizates were also treated by immersing for a few minutes at 20°C and then by heating in an air oven for 20 min at 200°C (A-Method). Triazine thiols were introduced as crosslinks onto the FKM backbone. The degree of cross-linking in the surface increased by these treatments and the depth of cross-linking reached up to about 40 μm thickness by control of treating conditions. The coefficient of friction in FKM vulcanizates decreased as a result of the surface treatment up to about 0.5 from 2.6. FKM vulcanizates decreased the tensile strength by these surface treatments because of the generation of cracks on the surface at 50% or 100% elongation. The surface treatment of FKM vulcanizates suppressed markedly the fixing between FKM vulcanizates and stainless steel at 150°C. Especially, the A-Method was very effective treating for retarding the fixing between FKM vulcanizates and metals. © 1994 John Wiley & Sons, Inc.     

硅藻土在高硬度彩色氟橡胶中的应用

研究了硅藻土MW-25和FP-22在彩色氟橡胶中的补强效果,对高硬度氟橡胶的硫化特性、物理及力学性能、热老化性能和压缩永久变形性能进行了测试。结果表明:两种硅藻土在氟橡胶中有很好的补强作用,添加量为40份时,胶料硬度即可达到87~89度(邵尔A硬度),拉伸强度达15 MPa,同时胶料具有较好的耐热老化性能和压缩永久变形性能。     

Synergic effect of N‐benzylimine aminothioformamide secondary accelerator during sulfur vulcanization of a styrene‐butadiene‐natural rubber blend

In this study we reported synergic activity of a novel secondary accelerator N‐Benzylimine aminothioformamide (BIAT) along with tetramethylthiuram disulfide (TMTD) in improving cure and mechanical properties of gum and filled mixes of Styrene‐Butadiene Rubber (SBR). The feasibility of application of BIAT in sulfur vulcanization of an ideal blend of SBR and natural rubber (NR) has also been investigated. The mechanical properties like t ensile strength, tear resistance, hardness, compression set, and abrasion loss were measured. Swelling values were also determined as a measure of crosslink densities of the vulcanizates. The binary accelerator system BIAT‐TMTD was found very effective in improving cure properties of the mixes of pure SBR and a 50/50 blend of SBR and NR.There was also found simultaneous improvement in mechanical properties of vulcanizates of both pure and blend. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

共混比对ACM／FKM共混胶性能的影响

采用硫化剂TCY为共硫化剂,研究了共混比对丙烯酸酯橡胶／氟橡胶共混胶的硫化特性、力学性能、耐热老化性能和耐油性能的影响。结果表明：TCY可以同时硫化两种橡胶;ACM／FKM共混比为20／80时．硫化胶具有较好综合力学性能和耐热老化性能;随着ACM用量的增加,硫化胶耐油性能逐渐下降。