注压成型硫化内压对锥形橡胶弹簧性能影响的研究

以采用注压成型工艺生产锥形橡胶弹簧为例,研究硫化内压对锥形橡胶弹簧外观质量和物理性能的影响。结果表明：锥形橡胶弹簧硫化时胶料用量增大,硫化内压增大,锥形橡胶弹簧的压缩高度和垂向刚度增大,但胶料用量过大会影响产品外观质量;硫化内压增大,锥形橡胶弹簧的耐屈挠疲劳性能、抗蠕变性能以及金属-橡胶粘合强度提高,产品综合性能改善。     

硅橡胶制品硫化内压的影响因素及设计要点

以硅橡胶与金属复合制品为载体,研究了填料质量、机台压力、硫化温度对硅橡胶制品硫化内压、制品外观及刚度的影响。结果表明,随着填料质量的增加、机台压力的增大、硫化温度的升高,硅橡胶制品硫化内压增大。硫化内压对产品外观有明显影响,当硫化内压超过45 MPa后,硅橡胶制品容易出现炸边的质量缺陷。随硫化内压的增大,产品刚度有增大的趋势。     

硫化工艺对EPDM微孔橡胶垫板动静刚度比的影响

研究了硫化三要素及填胶量对EPDM微孔橡胶垫板动静刚度比的影响。结果表明,硫化温度、硫化时间以及硫化压力对橡胶垫板动静刚度比的影响是通过橡胶发泡倍率的变化来体现的,即发泡倍率越大,动静刚度比越小;密度相当时,孔径越小且孔壁越薄,孔数越多,动静刚度比越小。     

硫化压力对硫化胶性能的影响

试验研究了模压和注压硫化压力对硫化胶性能的影响。模压和注压硫化时型腔内压力变化趋势相同，硫化胶的300％定伸应力和拉伸强度随硫化压力的增大而增大。拉断伸长率、撕裂强度和压缩永久变形减小。减震橡胶垫实际对比试验表明，注压硫化最大压力为模压硫化的2倍以上，达到相同的静态刚度时硫化胶的硬度下降且压缩永久变形减小了42％，可提高制品的使用寿命。     

橡胶制品硫化内压及模腔内温度的影响因素探讨

以注射成型橡胶-金属制品为例,研究橡胶制品硫化内压及模腔内温度的影响因素。结果表明:在橡胶制品注射成型中胶料起到介质的作用,平衡模腔内金属骨架等材料的升温速度;胶料的炭黑种类及用量、硫化体系、活化体系对橡胶制品硫化内压影响较大,对模腔内温度影响较小;胶粘剂M538与胶料的硫化匹配性良好;模具封胶可以提高橡胶制品硫化内压,有利于提高橡胶制品的稳定性。     

注射模硫化成型工艺在轨道减震器中的应用

研究注射模硫化成型工艺在轨道减震器中的应用,并与传统高压模硫化成型工艺进行对比。结果表明：与采用高压模硫化成型工艺相比,采用注射模硫化成型工艺可以缩短产品硫化时间,提高生产效率;增大产品内压,提高橡胶硫化均一程度,增大橡胶-金属粘合强度;减小产品疲劳试验后垂向静刚度、垂向动刚度和动静刚度比的变化,使用过程中产品性能更为稳定。     

注射模硫化成型工艺在轨道减震器制备中的应用

研究注射模硫化成型工艺在轨道减震器制备中的应用,并与传统高压模硫化成型工艺进行对比.结果 表明:与采用高压模硫化成型工艺相比,采用注射模硫化成型工艺可以缩短产品硫化时间,提高生产效率;增大产品内压,提高橡胶硫化均一程度,增大橡胶-金属粘合强度;减小产品疲劳试验后垂向静刚度、垂向动刚度和动静刚度比的变化,使用过程中产品性...     

高用胶量厚橡胶层二系叠层弹簧橡胶堆制品硫化成型工艺研究及硫化时间确定

研究硫化成型工艺对高用胶量厚橡胶层二系叠层弹簧橡胶堆制品质量的影响,并探究其硫化时间的确认方法。结果表明：采用压铸硫化成型方式完全可以满足该制品生产需求,且产品质量稳定性和生产合格率较高;根据产品胶料差示扫描量热分析、核磁共振法交联密度分析和刚度分析结果,采用胶层临界气泡点时间确定的产品硫化时间适宜,产品得到充分硫化。     

填胶量对BR/SBR/NR发泡材料硫化发泡特性及相结构的影响

采用无转子发泡流变仪系统研究了不同填胶量对顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)发泡体系的硫化及发泡特性的影响,并采用两步模压法制备了预交联度为30%不同填胶量的发泡材料,通过扫描电镜(SEM)观察并计算出填胶量对相结构(泡孔直径、泡孔壁厚度、单位体积内的泡孔数)的影响。结果表明,体积分数为70%～120%的填胶范围时可呈现典型的硫化历程;填胶体积分数为60%～80%时可清晰地呈现典型的发泡历程;填胶体积分数在70%～90%范围内,随着填胶量增加,泡孔直径显著减小,泡孔壁显著变薄,单位体积内的泡孔数显著增加;填料体积分数在100%～120%范围内对相结构的影响较小。     

硫化体系对异戊橡胶硫化胶性能的影响

主要考察了普通硫化体系、半有效硫化体系、有效硫化体系、低硫硫化体系及无硫硫化体系对异戊橡胶硫化胶力学性能及老化性能的影响.结果表明,随着交联密度的增大,拉伸强度和撕裂强度均呈先上升后下降趋势,定伸应力和硬度都增大,而拉断伸长率下降,压缩永久变形变小.促进剂DPTT用量对硫化胶力学性能及老化性能的影响较大.     

氟橡胶/EPDM动态硫化共混物的研究

研究了动态硫化工艺条件和共混比对氟橡胶（ＦＫＭ）／ＥＰＤＭ共混物拉伸性能拉、热油老化性能和应力松弛性能的影响。结果表明：与直接静态硫化相比,动态硫化可避免两种硫化体系的相互影响;静态硫化共混物拉伸强度只有２ＭＰａ,而动态硫化共混物可达１０ＭＰａ以上;工艺条件对动态硫化共混物性能的影响不大;随共混物中ＥＰＤＭ用量的增大,共混物的热空气老化和热油老化性能均有所下降     

聚酯短纤维用量对工程胎胎面用天然橡胶性能的影响

采用预处理的聚酯短纤维(PESF)增强天然橡胶作为工程胎胎面胶,研究了PESF用量对胎面胶加工性能、硫化特性和物理机械性能的影响.结果表明,随着PESF用量的增加,胎面胶胶料的混炼难度增加,功率、能耗和排胶温度增加,分散度降低;PESF的加入可降低胎面胶胶料的硫化温度,提高硫化速率,克服工程胎难于硫化的缺点;加入适量的PESF能提高胎面胶胶料的物理机械性能,尤其是抗撕裂性能.     

评价影响丁苯橡胶硫化胶性能的因素

为理解和正确执行丁苯橡胶（ＳＢＲ）１５００系列硫化胶性能评价的国家标准及为修订标准做必要准备，在现有实验室条件下，做了４个方面的工作：一是混炼温度对硫化胶性能的影响。试验表明：混炼温度在５０℃±５℃对硫化速度无明显影响，但随着混炼温度的升高，硫化２５ｍｉｎ的３００％定伸应力有升高趋势；二是硫化室温对硫化胶性能的影响。试验表明，室温对硫化胶影响不明显，但恢复时间Ｔ＿Ｒ的长短会直接影响硫化胶的物性，尤其对硫化２５ｍｉｎ的３００％定伸应力的影响是敏锐的，应引起足够重视；三是硫化时间对硫化胶性能的影响。试验推断Ｔ＿Ｂ的长短对硫化２５ｍｉｎ的３００％定伸应力的影响是举足轻重的，硫化时间（３５±２）ｍｉｎ对硫化胶性能影响不大；四是硫化温度对硫化胶性能的影响。试验指出，在１４５℃±１℃下，硫化２５ｍｉｎ的３００℃定伸应力相差３．３ＭＰａ，在１４５℃±０．５℃下，相差１．７ＭＰａ，由于差异会直接影响产品等级的判定，因此，国际标准规定硫化温度控制在１４５℃±０．５℃是十分必要的。     

聚苯乙烯增强室温硫化硅橡胶的制备及表征

以过氧化苯甲酰为引发剂,使苯乙烯在α,ω-羟基聚(二甲基-甲基乙烯基)硅氧烷(PDM-MVS)中进行自由基聚合,制备了PDM-MVS/聚苯乙烯(PS)共混物。将该共混物在室温下进行硫化,获得了PS增强的室温硫化硅橡胶,并对硅橡胶的力学性能和微观形态进行了表征。结果表明,目标硅橡胶的拉伸强度和扯断伸长率均随PDM-MVS中乙烯基质量分数的增加而增大,当乙烯基质量分数为1.50%时,其拉伸强度达3.9 MPa,扯断伸长率达416%,PS的增强效果明显;目标硅橡胶具有微相分离结构,PS作为分散相均匀分布于PDM-MVS连续相中,两相的相容性随着PDM-MVS中乙烯基质量分数的增加而增强。     

酸性气流脱除物STW-3#对NR硫化性能影响的研究

酸性气流脱除物是净化天然气、合成气、煤气时脱除的物质，STW-3#是由该物质制成的样品之一。就STW-3#对NR硫化性能的影响进行了研究。结果表明，STW-3#对NR有较好的硫化促进特性和一定的软化增塑作用；其用量3.0份以下时，硫化特性较差，3．0份以上时硫化特性较好，但超过4．0份时有粘辊和喷霜现象。它与促进剂M并用时，硫化特性与促进剂D相似。     

Systematic investigation on the effect of crosslinking agent type and dosage on the performance of TPU/MVQ based thermoplastic vulcanizates

Dynamic vulcanized thermoplastic polyurethane (TPU)/methyl vinyl silicone rubber (MVQ) thermoplastic vulcanizates (TPVs) were prepared in torque rheometer. The influence of the type and amount of peroxide crosslinking agent on the mechanical properties, thermal stability, micromorphology and melt flowability was systematically investigated. The results showed that the mechanical properties of the TPVs vulcanized by 2,5-dimethyl-2,5-di (tert-butyl peroxy) hexane (DBPH) first increased and then decreased with increasing the peroxide amount, while for dicumyl peroxide (DCP) vulcanizing system the mechanical properties slowly increased. Besides, the comprehensive mechanical properties vulcanized by DBPH were better than those of DCP group. The results of the thermogravimetric analysis showed that the TPVs vulcanized by DBPH had better heat stability, corresponding to the excellent thermo-oxidative aging performance and the 38% increase in tensile strength after aging. In addition, the MVQ rubber particles showed better dispersing performance for DBPH vulcanizing system. The melt flow rate of the TPVs showed a linear relationship with increasing DBPH dosage and became worse after the amount of crosslinking agent exceeded 1.5 phr. By comprehensive comparison, the TPVs have better performance when use peroxide DBPH as the crosslinking agent and the dosage is 1.5 phr.     

加成型室温硫化硅橡胶补强研究

以乙烯基硅油（SiVi）、含氢硅油（SiH）为主要原料,合成了可室温硫化的液体硅橡胶。分析了SiVi与SiH比例、几种补强材料、MQ树脂的合成工艺以及用量对硅橡胶性能的影响。结果表明,当nSiH：nSiVi：1．3,MQ树脂用量为25份时,硅橡胶的拉伸强度为232MPa,断裂伸长率为110％.     

Influence of Cure Conditions on the Adhesion of Rubber Compound to Brass-plated Steel Cord. Part I. Cure Temperature

The effect of the cure temperature of rubber compound on the adhesion with brass-plated steel cord was investigated in conjunction with the formation, growth and degradation of the adhesion interphase formed between the rubber compound and brass-plated steel cord. With increasing cure temperature from 130°C to 190°C, the pull-out force after cure decreased linearly. This decrease in adhesion force at higher temperature may be explained by the limitation of the mass transfer of vulcanizing agents into the adhesion interphase and/or rubber compound near the adhesion interphase, resulting in a deficiency of sulfur due to the fast cure of the rubber compound which significantly retards the diffusion of vulcanizing chemicals. Also, at a high temperature, an adhesion interphase with a ZnS-rich layer, which may act as a barrier to copper diffusion for the formation of the adhesion interphase of copper sulfide, was formed. After thermal aging of the adhesion samples, the pull-out force decreased in comparison with that of the unaged. The decrease of pull-out force after thermal aging stemmed mainly from the decline of the tensile properties after thermal aging. The adhesion property after humidity aging was completely different from that after thermal aging. With increase in the cure temperature to 160°C, the pull-out force increased. But further increase in the cure temperature caused a decline in pull-out force. This phenomenon can be explained by the degradation of the adhesion interphase. At lower cure temperatures, a severe growth of copper sulfide and a large extent of dezincification were observed in the adhesion interphase. At higher cure temperatures, a significant growth of copper sulfide in the adhesion interphase appeared. The proper formation of the adhesion interphase and good physical properties of the rubber compound at a moderate cure temperature can result in high retention of adhesion properties.     

Influence of Cure Conditions on the Adhesion of Rubber Compound to Brass-plated Steel Cord. Part I. Cure Temperature

The effect of the cure temperature of rubber compound on the adhesion with brass-plated steel cord was investigated in conjunction with the formation, growth and degradation of the adhesion interphase formed between the rubber compound and brass-plated steel cord. With increasing cure temperature from 130°C to 190°C, the pull-out force after cure decreased linearly. This decrease in adhesion force at higher temperature may be explained by the limitation of the mass transfer of vulcanizing agents into the adhesion interphase and/or rubber compound near the adhesion interphase, resulting in a deficiency of sulfur due to the fast cure of the rubber compound which significantly retards the diffusion of vulcanizing chemicals. Also, at a high temperature, an adhesion interphase with a ZnS-rich layer, which may act as a barrier to copper diffusion for the formation of the adhesion interphase of copper sulfide, was formed. After thermal aging of the adhesion samples, the pull-out force decreased in comparison with that of the unaged. The decrease of pull-out force after thermal aging stemmed mainly from the decline of the tensile properties after thermal aging. The adhesion property after humidity aging was completely different from that after thermal aging. With increase in the cure temperature to 160°C, the pull-out force increased. But further increase in the cure temperature caused a decline in pull-out force. This phenomenon can be explained by the degradation of the adhesion interphase. At lower cure temperatures, a severe growth of copper sulfide and a large extent of dezincification were observed in the adhesion interphase. At higher cure temperatures, a significant growth of copper sulfide in the adhesion interphase appeared. The proper formation of the adhesion interphase and good physical properties of the rubber compound at a moderate cure temperature can result in high retention of adhesion properties.     

双酚AF硫化体系的硫化特性分析

研究了双酚AF硫化体系对氟橡胶硫化特性的影响。研究表明采用双酚AF硫化体系对胶料的加工性能无任何影响；在硫化体系中，BPP（苄基三苯基氯我）对胶料硫化特性的影响较双酚AF更为明显。本文的研究结果为高性能氟橡胶混炼胶的设计提供依据。