硫化体系对EPDM硫化胶力学性能的影响

考察了4,4′-二硫代二吗啉（DTDM）,N,N′-间苯撑双马来酰亚胺（HVA-2）,甲基丙烯酸镁与硫黄和过氧化二异丙苯（DCP）复合硫化体系对三元乙丙橡胶力学性能的影响。结果表明,与纯硫黄硫化胶相比,DTDM/HVA-2/S复合硫化体系的EPDM硫化胶拉断伸长率及压缩永久变形均较小,而拉伸强度、定伸应力和硬度均较大,耐老化性能较好。甲基丙烯酸盐可明显提高硫黄、过氧化物硫化EPDM硫化胶的交联密度、拉伸强度、定伸应力和拉断伸长率。在甲基丙烯酸镁/炭黑/EPDM胶料中添加等量S i69改性白炭黑和石蜡油后,硫化胶各项力学性能都有明显提高,定伸应力和硬度保持较低水平,耐热空气老化性能有所改善。     

EPDM硫化橡胶的热稳定性研究

对ＥＰＤＭ的过氧化物硫化、硫黄硫化和含硫化合物硫化以及两种不同硫化体系并用的硫化胶热稳定性进行比较，优选热稳定性较好的硫化体系用于产品的制造。采用过氧化二异丙苯（ＤＣＰ）硫化的硫化胶虽具有极好的热稳定性，但其耐撕裂性能较差，且价格较高。因此可考虑采用ＤＣＰ的并用硫化体系。当ＤＣＰ用量为５份，硫黄用量不超过１份时，硫化胶具有较好的热稳定性。     

增强三元乙丙橡胶粘合性能的研究

研究烷基酚醛树脂用量、硫化剂DCP/TAIC用量比、增塑剂用量以及硫化工艺对三元乙丙橡胶(EPDM)粘合性能的影响。结果表明:烷基酚醛树脂可提高EPDM与聚酯线绳的粘合性能;随硫化剂DCP/TAIC用量比增大,EPDM与聚酯线绳的粘合性能先提高后保持不变,用量比为9/1时综合性能最佳;EPDM与聚酯线绳的粘合性能随增塑剂2280用量增大几乎呈线性下降趋势;在充分硫化情况下,低温长时间硫化和高温快速硫化工艺对粘合性能影响不大,为提高生产效率,EPDM汽车多楔带可采用高温快速硫化工艺。     

Effect of norbornyl modified soybean oil on CB‐filled chloroprene rubber

Carbon black (CB)‐filled chloroprene rubber (CR) compounds and vulcanizates containing naphthenic oil (NO), soybean oil (SO), and two different levels of norbornyl modified soybean oil (MSO) were prepared and investigated. The MSO was prepared through the reaction of SO and dicyclopentadiene (DCPD) at different ratios. Various properties including gel fraction, crosslink density, bound rubber fraction, curing behavior, thermal, mechanical, and aging properties of CB‐filled CR containing different oils were compared. It was observed that the addition of SO and MSO could benefit the dispersion of the filler, lower the glass transition temperature, and increase the thermal stability of the CB‐filled CR/MSO compounds and vulcanizates, and also slightly decrease the crosslink density of the CB‐filled CR/MSO vulcanizates compared to that of the CR/NO vulcanizate. With the increase of the modification level of the MSO, the curing time of the CB‐filled CR/MSO compounds was found to be decreased, the tensile property, tear strength, abrasion resistance, and aging resistance of the CB‐filled CR/MSO vulcanizates were improved compared with those of the CB‐filled CR/NO vulcanizate. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43809.     

用甲基丙烯酸原位改性纳米碳酸钙填充三元乙丙橡胶Ⅰ.交联剂和甲基丙烯酸用量的影响

用甲基丙烯酸(MAA)原位改性纳米碳酸钙填充三元乙丙橡胶(EPDM),制备了纳米碳酸钙增强EPDM硫化胶。考察了过氧化二异丙苯(DCP)用量和MAA用量对EPDM硫化性能和物理机械性能的影响,研究了硫化胶的应力弛豫行为。结果表明,MAA的引入降低了EPDM的焦烧时间,但未对硫化速率产生明显影响;EPDM硫化胶具有较好的物理机械性能,当MAA用量为1.2质量份时,其拉伸强度可达25.6 MPa。此外,EPDM硫化胶的应力弛豫程度和速率都随着MAA的加入而增大。     

甲基丙烯酸锌对EPDM的补强作用

研究了在过氧化物硫化体系中,甲基丙烯酸锌[Zn(MAA)2]和硫化剂DCP的用量对EPDM胶料性能的影响。试验结果表明,Zn(MAA)2用量的增大对EPDM胶料粘度的影响不大,但可显提高硫化速度和硫化程度;随着Zn(MAA)2用量的增大,EPDM硫化胶的邵尔A型硬度逐渐增大,拉伸强度和扯断伸长率都是先升高再下降。当硫化剂DCP用量为1．0份时,EPDM硫化胶具有最佳的综合性能。Zn(MAA)2的补强效果与EPDM的物理化学性质有关,乙烯质量分数和第三单体ENB质量分数高时补强效果好。     

Effects of cashew nut shell liquid as a plasticizer on cure characteristics,processability, and mechanical properties of 50 : 50 NR/EPDM blends: A comparison with paraffin oil

50 : 50 natural rubber (NR) and ethylene–propylene–diene monomer rubber (EPDM) blends were prepared with different contents of cashew nut shell liquid (CNSL), a natural product obtained from the shells of the cashew nut, as a plasticizer. For comparison, a commercial paraffin oil plasticizer was also used. The effect of plasticizer content on the cure characteristics, processability, and mechanical properties such as tensile strength, elongation at break, and Young's modulus before and after ageing was investigated. Scanning electron microscopy (SEM) was used to observe the blend morphology. The results indicated that the CNSL plasticizer resulted in lower Mooney viscosity and lower cure time of the 50 : 50 NR/EPDM blends. The incorporation of CNSL into 50 : 50 NR/EPDM blends improved tensile strength and elongation at break but decreased Young's modulus. On addition of CNSL the resistance of the blends to heat and weathering ageing improved. Scanning electron micrographs revealed that the morphology of the blend plasticized with CNSL is finer and more homogeneous compared with the blend plasticized with paraffin oil. Overall results indicate that CNSL can be used as a cheaper plasticizer to replace paraffin oil in NR/EPDM blends with improved processability and mechanical properties. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

用TMPTA改善过氧化物硫化EPDM性能的研究

在ＥＰＤＭ／白炭黑胶料的过氧化物硫化体系中,加入三羟甲基丙烷三丙烯酸酯（ＴＭＰＴＡ）能够迅速提高硫化胶的交联效率,增大网络密度,缩短硫化时间;当ＴＭＰＴＡ用量为０．５份时,ＥＰＤＭ硫化胶的拉伸强度保持率和扯断伸长率保持率达到最大值;在２．０份过氧化二异丙苯（ＤＣＰ）中加入０．５份ＴＭＰＴＡ,胶料的硫化时间比单独使用３．０份ＤＣＰ缩短４０％,且硫化胶的定伸应力、拉伸强度和撕裂强度均明显提高。     

A strategy to prepare internally plasticized PVC using a castor oil based derivative

Internally plasticized PVC was prepared via chemical reaction of azide PVC and alkynyl group containing castor oil methyl ester. The chemical structure of alkynyl group containing castor oil methyl ester and internally plasticized PVC was characterized with FT-IR and ¹H NMR. Properties of internally plasticized PVC, including thermal stability, tensile tests and resistance to extraction in different solvents, was investigated. The results showed that alkynyl group containing castor oil methyl ester, as internal plasticizer of PVC, not only decreased the T_g of PVC from 84.6 °C to 41.6 °C efficiently, but also presented no plasticizer loss in five different solvents. The tensile tests showed that elongation at break and tensile strength of internally plasticized PVC was 353.8% and 18.1MPa. The internally plasticized PVC has potential application in replacing the traditional PVC material in PVC products with high durability.     

Effect of ketal group in castor oil acid-based plasticizer on the properties of poly(vinyl chloride)

Two castor oil acid esters containing a ketal or ketone group (KCL or CL), as alternative plasticizers for poly(vinyl chloride) (PVC), were prepared. The structures were confirmed by ¹H NMR and FTIR spectroscopies. The effects of the presence of a ketal or ketone group in these compounds on PVC plasticization were examined. The DMA and SEM results showed that both plasticizers were miscible with PVC and exhibited excellent plasticizing properties, compared to those of dioctyl phthalate (DOP). The PVC plasticized by KCL displayed a lower T_g value of 20.6 ° C, which was lower than that of PVC plasticized with DOP (22.3 ° C) and PVC plasticized with CL (40.5 ° C). Tensile tests indicated that PVC plasticized using KCL showed a 37% higher of elongation at break than PVC plasticized by CL and 30% higher than PVC plasticized by DOP. The plasticizing mechanism was also investigated. Moreover, exudation, volatility, and extraction tests, along with TGA indicated that the presence of ketal groups effectively improved the migration resistance of plasticizer and the thermal stability of PVC blends. Taken together, introducing ketal groups into plasticizer might be an effective strategy for improving its plasticizing efficiency.     

原位合成丙烯酸钠改性三元乙丙橡胶制备吸水膨胀橡胶

通过氢氧化钠(NaOH)和丙烯酸(AA)的中和反应,在三元乙丙橡胶(EPDM)中原位合成丙烯酸钠(NaAA),并在有机过氧化物的作用下将所得混炼胶进行硫化。比较了原位生成NaAA、直接添加NaAA和直接添加聚丙烯酸钠(PNaAA)等三种不同制备吸水膨胀橡胶方法对混炼胶硫化性能和硫化胶吸水膨胀性能的影响,主要研究了原位合成NaAA改性EPDM混炼胶的硫化特性和硫化胶的吸水膨胀性能及其力学性能。结果表明,原位合成NaAA改性EPDM的性能优于直接添加NaAA或PNaAA的EPDM,它不但具有良好的力学性能,而且还具有良好的吸水膨胀性能;随着NaAA含量的增大,硫化速度、硫化程度和吸水膨胀性能均有提高;吸水膨胀橡胶,在NaAA为30质量份时,力学性能具有最大值。过氧化二异丙苯(DCP)用量增大,吸水膨胀率下降,但仍可提高硫化胶的力学性能。     

不同牌号三元乙丙橡胶的结构与性能对比

对8个牌号三元乙丙橡胶(EPDM)的微观结构、硫化特性、物理机械性能、耐磨性能及耐老化性能进行了对比.结果表明,EPDM中第3单体亚乙烯基降冰片烯(ENB)质量分数影响了EPDM的硫化速率.8个牌号中EPDM 9950 C的硫化速率最快,EPDM 3722的硫化速率最慢;充油胶EPDM 3666的硫化速率与结构类似的E...     

丙烯酸酯橡胶的研究与应用

采用丙烯酸酯类单体通过乳液聚合制备了丙烯酸酯橡胶（ＡＣＭ）。试验研究了ＡＣＭ硫化胶的性能。结果表明,ＡＣＭ引入—ＣＯＯＨ基团,用环氧树脂作硫化剂,可以实现高温快速硫化,且其硫化胶性能良好;增大带有柔性基团的单体（增塑剂）的比例,可以改善ＡＣＭ硫化胶的耐低温性;增大极性大的单体（丙烯腈）的比例,可以改善ＡＣＭ硫化胶的耐油性和耐热性。ＡＣＭ与氟橡胶（ＦＫＭ）并用初步研究结果显示,ＦＫＭ的用量在５０份以上时,并用硫化胶性能接近ＦＫＭ     

不饱和聚酯增塑NBR的研究

采用聚酯合成厂的废聚酯经化学降解再聚合而成的不饱和聚酯作为增塑剂,加入到ＮＢＲ中,通过对不饱和聚酯在ＮＢＲ中的用量、增塑性能、硫化胶的耐热性能和耐溶剂性能及其硫化体系的研究表明,不饱和聚酯在ＮＢＲ中的用量以２０份为宜,添加不饱和聚酯的ＮＢＲ胶料采用交联剂ＤＣＰ／硫黄并用硫化体系的各项性能优于单独使用硫黄硫化体系。不饱和聚酯是一种良好的ＮＢＲ增塑剂,与ＮＢＲ的相容性良好,可部分替代液体酯类增塑剂     

Properties of poly(vinyl chloride) incorporated with a novel soybean oil based secondary plasticizer containing a flame retardant group

A novel bio‐based plasticizer containing flame retardant groups based on soybean oil (SOPE) was synthesized from epoxidized soybean oil (ESO) and diethyl phosphate through a ring‐opening reaction. PVC blends plasticized with ESO and SOPE were prepared, respectively. Properties including rheological behavior, thermal stability, flame retardant performance, mechanical properties of PVC plasticized with ESO and SOPE were carefully studied. The results showed that the plasticized PVC blends indicated better compatibility, thermal, and mechanical properties. As a novel bio‐based plasticizer containing flame retardant groups, the TGA data indicated that the thermal degradation temperature of PVC blends plasticized with SOPE could reach to 275.5°C. LOI tests and SEM indicated that the LOI value of PVC blends could increase from 24.2 to 33.6%, the flame retardant performance of SOPE was put into effect by promoting polymer carbonization and forming a consolidated and thick flame retardant coating quickly, which is effective to prohibit the heat flux and air incursion. The enhancement in flame retardancy will expand the application range of PVC materials plasticized with SOPE. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42111.     

EPDM/POE共混橡胶耐热老化性能研究

以三元乙丙橡胶(EPDM)和热塑性弹性体(POE)并用为主体材料,采用不同配方设计和硫化工艺制得了耐热老化性能优良的共混胶.探讨了过氧化二异丙苯(DCP)、烯丙基异氰脲酸酯(TALC)和硫磺(S)不同用量对EPDM/POE共混胶的力学性能、热老化性能的影响.结果表明,从并用POE改性来提高EPDM耐热方面考虑,以过氧化物DCP硫化为主,加入部分TAIC和少量硫磺有助于两者的共硫化,得到的共混胶具有良好的耐热老化性能.     

Plasticization effect of hydrogenated transgenic soybean oil on nitrile‐butadiene rubber

Nitrile‐butadiene rubber (NBR) compounds were prepared with different amounts of hydrogenated transgenic soybean oil (HTSO) as renewable plasticizers. For comparison, similar compounds were prepared with petroleum‐based dioctyl‐phthalate (DOP), one of the most common plasticizers for NBR. Four HTSOs with different degree of hydrogenation were used, of which three HTSOs are prepared by hydrogenation reaction at different reaction conditions and one is commercial available. The plasticization effects of HTSO and of DOP were studied by Mooney viscometry, capillary rheometry, differential scanning calorimetry (DSC), and rubber processing analysis (RPA). The results showed that all the HTSOs had better plasticization effect than DOP on NBR. The swelling index result showed that the highly‐hydrogenated‐HTSO plasticized NBR vulcanizate have higher crosslinking density than the low‐hydrogenated ones. It is worthy to mention that, the introduction of high‐hydrogenated‐HTSO greatly improved both the processability of the NBR compounds and the mechanical performance of the final products, which is hard to achieve for most of the plasticizers. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40643.     

三元乙丙橡胶的复合交联

采用过氧化二异丙苯(DCP)和由促进剂M、促进剂TRA、促进剂BZ及硫黄组成的硫化体系对三元乙丙橡胶实施复合交联,研究了复合交联体系对混炼胶的硫化特性、硫化胶的力学性能及耐老化性能的影响,确定了该体系复合交联的配方和工艺优化设计的思路。结果表明,由促进剂M0．5份,促进剂TRA0．2份,促进剂BZ0．8份,S1．0份,DCP2．0份组成的复合交联体系硫化胶综合性能好．DCP宜在硫黄硫化体系混炼胶停放72h后加入。     

CM/EPDM并用胶在胶管中的应用

研究硫化体系、稳定体系和增塑体系对氯化聚乙烯橡胶(CM)/EPDM并用胶性能的影响,并试制出达到环保标准的胶管配方.优化配方为;CM 70,EPDM 30,炭黑N550 30,炭黑N660 20,硬脂酸钙3,钙/锌盐3,环氧大豆油10,增塑剂TOTM 3,防老剂RD 1.5,防老剂4020 1,硫化剂DCP 4,助交联剂CAMV 3,硫黄1,其他5.     

聚酯/聚醚混合型增塑剂对乙烯丙烯酸酯橡胶性能的影响

研究不同牌号乙烯丙烯酸酯橡胶(AEM)及聚酯/聚醚混合型增塑剂种类和用量对硫化胶性能的影响。结果表明:AEM Vamac G硫化胶的耐低温性能较好,而AEM Vamac GLS硫化胶的物理性能、耐老化性能和耐油性能较好,选择并用比为50/50的AEM Vamac G/AEM Vamac GLS并用胶作为主体材料,硫化胶的物理性能、耐油性能和耐低温性能可更好地平衡;添加增塑剂TP-759的硫化胶的耐低温性能较好,添加增塑剂RS-735的硫化胶的耐热老化性能较好,两者耐油性能相当;随着增塑剂用量的增大,硫化胶的耐低温性能提高,拉伸强度降低,拉断伸长率和压缩永久变形增大,油浸泡后体积变化率减小。