Applied Theory

• zhangliang,lixiaolin, and
• Effect of Liquid Phase Modification on Surface Active Sites of Silica

• 2020 Vol. 67(6): 0410-0414

  [Abstract](38)

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• Abstract:Silane coupling agent KH590 and dispersant MOA were used to modify silica in liquid phase to get modified silica slurry.Then natural rubber（NR）/silica masterbatches were prepared by dry-mixing method and wet-mixing method.The coupling agent Si69 was added to masterbatches during subsequent mixing，NR/silica nanocomposites were obtained and their properties were studied，and whether there were resiclual active sites on the surface of liquid phase modified silica to react with couping agent was investigated.The results showed that the coupling agent Si69 added subsequently could not be grafted on the surface of silica to play coupling role，and it could not improve the dispersion of silica in the rubber matrix and the performance of NR/silica nanocomposites.The active sites on the surface of liquid phase modified silica had all been occupied.

• Zhu Shanliang,Li Tao,Gu Yuchen,Li Chengcheng,Chen Hailong,Wang Dongxu and LI Qingling
• Thermal Field Distribution and Interface Characteristics of Multilayer Rubber Composite during Microwave Heating

• 2020 Vol. 67(6): 0415-0422

  [Abstract](42)

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• Abstract:One-dimensional unsteady finite element heating PDE model based on Maxwell equation was established for microwave heating of multilayer rubber composite under different wave sources.Taking SBR material and NBR material complexing as examples，the effects of material thickness and microwave power on the temperature field and interface characteristics of multilayer（two-layer）rubber under single/double wave sources were simulated by the finite-difference time-domain method.The results showed that the change of mirowave power would affect the temperature distribution of multilayer rubber composite.The mirowave amplitude would change slightly at the interface of superposed rubber materials.The rubber materials with small dielectric loss should be directly exposed to the microwave source，which was conducive to the propagation of microwave through rubber materials with small dielectric loss to the depth.The thickness of each layer rubber materials should be controlled below the critical penetration depth.To the single source microwave heating，the multi-source microwave heating could improve the heating uniformity of multilayer rubber composite.Compared with the results of the traditional finite element model，the validity of this research model was verified.

• Li Yu,WANG Peng,WANG Bing,CHENG Wei and Li Hong-wei
• Study on Optimization of Acoustic Parameters Based on Viscoelastic Material H-N Model

• 2020 Vol. 67(6): 0423-0426

  [Abstract](27)

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• Abstract:The acoustic model（H-N model） of viscoelastic materials was established by using the finite element software.The influence of the acoustic parameters in H-N model on the sound absorption and sound insulation performance of viscoelastic materials in a wide frequency range （300～20 000 Hz） was studied.The results showed that with the increase of the parameter（α） related to the loss peak width，the sound absorption performance and sound insulation performance of the material increased first and then decreased.When α was 0.35 and 0.2，the sound absorption performance and sound insulation performance of the material were optimal respectively.With the increase of the parameter（β） related to the loss peak symmetry and the parameter（E∞） of the modulus of the glassy platform area at the high frequency end，the sound insulation performance of the material both decreased，the sound absorption performance both increased first and then decreased.When β was 0.2 and E∞ was 100 MPa，the sound absorption performance of the material was the best.With the increase of the parameter（E0） of the modulus of rubbery platform at low frequency end and the parameter（t） of the relaxation time related to temperature，the sound absorption performance and sound insulation performance of the material both decreased.The influence rule of acoustic parameters of viscoelastic materials on their sound absorption and sound insulation properties could provide acoustic theoretical basis for the formulation design of viscoelastic materials in wide frequency band.

Material · Compounding

• YIN Xiaolong,DING Mengru,JIANG Shanshan and MIN Jie
• Development of Silicone Rubber with High Flexibility and Solvent Resistance

• 2020 Vol. 67(6): 0427-0433

  [Abstract](32)

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• Abstract:The addition liquid silicone rubber was prepared by using vinyl polydimethylsiloxane asbasic polymer，hydrogenated polydimethylsiloxane as crosslinking agent and isopropanol coordinated chloroplatinic acid as catalyst.The effects of the ratio of Si—H in hydrogenated polydimethylsiloxane to Si—Vi（vinyl group） in vinyl polydimethylsiloxane（A） and the active hydrogen content in hydrogenated polydimethylsiloxane（ω） on the mechanical properties of silicone rubber were studied.Adding external plasticizer dimethyl polydimethylsiloxane and internal plasticizer octadecyl methacrylate respectively，and the effects of the type and amount of plasticizers on the mechanical properties and solvent resistance of silicone rubber were investigated.The results showed that，the compression modulus of silicone rubber increased first and then decreased with the increase of A，and it increased with the increase of ω.When A＝1.50，ω＝0.010 0，the compression modulus of silicone rubber was larger.After adding plasticizer，the compression modulus of silicone rubber decreased with the increase of the mass fraction of plasticizer.At the same mass fraction，the plasticizing effect of internal plasticizer was better than that of external plasticizer，and the solvent resistance of internal plasticized silicone rubber was better than that of external plasticized silicone rubber.When A＝1.05，ω＝0.003 6，and the mass fraction of internal plasticizer was 0.40，the silicone rubber with high flexibility and solvent resistance could be prepared.

• Liu jinling,lu ming and hu licheng
• Effect of Moisture Content of Powder Filler on Properties of Fluororubber

• 2020 Vol. 67(6): 0434-0438

  [Abstract](22)

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• Abstract:The effects of the moisture content of powder filler（hereinafter referred as filler） on vulcanization charecteristics，physical properties，hot air aging resistance and oil-resistant properties of fluororubber were studied.The results showed that the calcium fluoride-based filler（calcium fluoride＋active magnesium oxide＋calcium hydroxide） had significant moisture absorption when it experienced different temperature and humidity.The vulcanization rate of fluororubber increased with the increase of water content of filler.The moisture absorption of filler would cause the fluctuation of the tensile elongation of fluororubbers before and after aging.The increase of moisture content of filler would cause the compression set increase after aging in hot air on 200 ℃×24 h and soaking in aviation kerosene RP-3 fuel on 150 ℃×24 h.The moisture content of filler had less significant effect on the mass and volume change rate of fluororubber before and after soaking in aviation kerosene RP-3 fuel.

• ZHANG tiezhu,ZHANG Zhiqiang and zhouzhifeng
• Effect of NdBR/SBR Blending on Properties of Semi-steel Radial Tire Tread Compound

• 2020 Vol. 67(6): 0439-0442

  [Abstract](28)

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• Abstract:The effect of neodymium butadiene rubber（NdBR）/styrene butadiene rubber（SBR） blending on the properties of semi-steel radial tire tread compound was studied.The results showed that the properties of three kinds of NdBR（BR9110A，BR9110B and CB24） compounds were almost the same，the heat generation performance，cutting resistance and wet skid resistance of the compound could be improved by partially replacing SSBR and NdBR with ESBR.The comprehensive physical properties of the compound could be significantly improved by master rubber refining process，the cutting resistance，crack resistance and wet skid resistance increased，and the rolling resistance decreased.

Product · Design

• SONG Hongguang,CAO Jiangyong,WANG Fusheng and WANG Shudong
• Influence of Product Structure on Fire Resistance of Rubber Elastic Components of Rail Vehicles

• 2020 Vol. 67(6): 0443-0448

  [Abstract](30)

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• Abstract:The influence of product structure on the fire resistance of rubber elastic components of rail vehicles was studied.By simulating the structure of rubber elastic components，the fire resistance tests of different types of rubber-metal structure samples showed that when the proportion of rubber area was the same，the fire resistance of the samples with metal partition in rubber was obviously improved，and the more metal partition was，the better the fire resistance was.As the proportion of rubber area decreased，the maximum smoke density and the maximum average heat release rate of the samples with different structures decreased，and the fire resistance was improved.When the proportion of rubber area of the sample without metal isolation was less than 60%，the fire resistance of the sample could meet the HL2 requirements of EN 45545-2.When the proportion of rubber area of the sample with two metal partitions in rubber or metal cylinder in rubber center reached 80%，the fire resistance of the sample could still meet the HL2 requirements of EN 45545-2.

• Huang Zhaoge,Li Wei,Meng Xiangkun and Yong Zhanfu
• Finite Element Analysis of Optimal Design of Non-pneumatic Tire

• 2020 Vol. 67(6): 0449-0454

  [Abstract](27)

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• Abstract:Based on the Abaqus finite element analysis software，took 2.50－14 non-pneumatic tire with type C hole as the research object，3-D finite element model of the non-pneumatic tire was established.In view of the supporting structure maximum stress and grounding area of the non pneumatic tire，the orthogonal test analysis was carried out for four factors：the radius of the hole arc，the number of the supporting structure，the width of the hard elastomer layer and the thickness of the hard elastomer layer.The results showed that the supporting structure performance，load-carrying capacity and grounding performance of the optimal design non-pneumatic tire were greatly improved when the inner radius and outer radius of the hole arc were 17 mm and 20 mm respectively，the number of the supporting structures was 40，the width of the hard elastomer layer was 44 mm，and the thickness of the hard elastomer layer was 6 mm.

Technology · Equipment

• qiuliyan,houming,duanxiaole,luoweijun and huanggangle
• Application of Vulcanization Simulation Analysis Technology in Curing Process Design of Elastic Wheel Elastomer Part

• 2020 Vol. 67(6): 0455-0460

  [Abstract](25)

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• Abstract:The application of vulcanization simulation analysis technology in curing process design of elastic wheel elastomer part was studied.Firstly，the empirical equation was used to calculated the curing time of elastic wheel elastomer part.On this basis，the vulcanization simulation analysis technology was used to further simulate and analyze the curing process of elastic wheel elastomer part through model construction，mesh dividing and process parameter setting，the curing time was shortened by 16.7%.From the test results of swelling index，critical size（the sickness） and vertical stiffness，it could conclude that the results of simulation analysis of elasticity wheel elastomer part were more consistent with the actual production process，the temperature and curing degree were more accurate，the size and properties of the products were better than the results of empirical formula.In the actual production，the application of the vulcanization simulation analysis technique to vulcanization process design of rubber products could reduce the number of test and development cost，improve the quality of product significantly.

• zhangshichao
• Design of One Type Control System of Mixer Upstream Equipment Based on PLC

• 2020 Vol. 67(6): 0461-0465

  [Abstract](25)

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• Abstract:This paper introduced the design of one type control system of the mixer upstream equipment based on programmable logic controller（PLC）.Siemens S7 1500 PLC of this control system communicated with ET200SP remote IO workstation，weighing instrument，TP1200 touch screen，master computer and mixer through the Profinet communication protocol.This control system realized the automatic weighing of carbon black，powder，oil and raw rubber according to formula given by the master computer，and automatically put them into the mixer.This control system ran stably and reliably，and could reduce the labor intensity of workers，improved production efficiency.

Testing · Analysis

• ZHANG Hongxia,ZHANG Hao,YU Xiaobo,ZHAO Guo,LIU Junxia and ZHANG Xiubin
• Effect of Solvent Extraction on SEM Imaging of Vulcanizate Sample

• 2020 Vol. 67(6): 0466-0471

  [Abstract](27)

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• Abstract:Taking SBR/BR blend（vulcanizate） filled with silica as an example，the vulcanizate was extracted with toluene and acetone，then frozen and sectioned，and the sectioned samples were analyzed by scanning electron microscope（SEM） to evaluate the dispersion of the filler in the vulcanizate.The results showed that，in SEM analysys，without solvent extraction of the vulcanizate，some areas on the surface of the sample were covered by the filling oil and other additives separated from the vulcanizate，which affected the judgment of the dispersion of the filler in the vulcanizate.When the weak polarity toluene or strong polarity acetone was used to extract the vulcanizate at different temperatures，the influence of other additives precipitation from the vulcanizate could be eliminated，and the imaging effect of the sample was improved significantly，so the dispersion of the fillers on the sample surface could be well observed，and the solvent extraction temperature had no significant effect on SEM imaging of the sample.

• dingwenli,qishengkai,wangchao and wuaiqin
• Determination of Rubber Oil Content in Vulcanizate

• 2020 Vol. 67(6): 0472-0474

  [Abstract](22)

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• Abstract:The determination of the rubber oil content in the vulcanizate was studied. The solvent extraction method was used to obtain the extract of the vulcanizate，the extract was subjected to silica gel column chromatography，and the method for determining the rubber oil content in the vulcanizate was established. The maximum relative standard deviation of the mass fraction of the rubber oil in the vulcanizate determined by this method was 2. 3%，and the recovery rate was 88. 0% to 104. 1%. The method was easy to operate，repeatable，and the results were accurate and reliable

Gomprehensive and Special Review

• LIU Tai-kai and LIU Meng-yan
• Research Progress of Fatigue Life of Engine Rubber Mount

• 2020 Vol. 67(6): 0475-0479

  [Abstract](24)

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• Abstract:Aiming at the research on fatigue life prediction of rubber mount，the methods of fatigue life prediction of rubber materials and rubber components at home and abroad were reviewed.The methods of fatigue life predicition of rubber mount were mainly divided into crack initiation approach and crack propagation approach.In the crack initiation approach，relative to the strain and strain energy density，the rubber fatigue life prediction model established with the equivalent stress as the damage parameter was more suitable for the prediction of the rubber mount fatigue life.The rubber fatigue life prediction model established by the crack propagation approach could well predict the fatigue life of rubber mount.Compared with the crack initiation approach，the crack propagation approach could predict the crack direction of the rubber mount，which had a better guiding significance for engineering.

国内外动态

• 吴淑华
• 燕山石化合成橡胶再出口

• 2020 Vol. 67(6): 0414-0414

  [Abstract](23)

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• 吴淑华
• 10万t级丁腈胶乳项目宁波奠基

• 2020 Vol. 67(6): 0426-0426

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• zhangzhao
• 五峰山长江大桥主缆穿上北橡院防腐“外衣”

• 2020 Vol. 67(6): 0433-0433

  [Abstract](20)

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• 吴淑华
• 吉林玲珑轮胎智能生产项目启动

• 2020 Vol. 67(6): 0438-0438

  [Abstract](22)

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• 赵敏
• 一种耐磨损的橡胶护舷

• 2020 Vol. 67(6): 0438-0438

  [Abstract](25)

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• 赵敏
• 一种低压缩永久变形活性氯型丙烯酸酯橡胶及其制备方法

• 2020 Vol. 67(6): 0460-0460

  [Abstract](24)

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• zhangzhao
• 青岛市橡胶工业设计研究院诞生

• 2020 Vol. 67(6): 0460-0460

  [Abstract](25)

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• zhangzhao
• 知网整改学术不端检测系统

• 2020 Vol. 67(6): 0465-0465

  [Abstract](41)

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• zhangzhao
• RubberCon2020和IRC2020延至2021年举办

• 2020 Vol. 67(6): 0465-0465

  [Abstract](28)

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Special Contribution

• WANG Guolin,CHEN Chen and ZHOU Haichao
• Study on Influence of Contact Characteristics between Tread and Carcass on Rolling Resistance of Tire

• 2020 Vol. 67(6): 0403-0409

  [Abstract](35)

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• Abstract:Taking 205/55R 16 car radial tire as example，a three-dimensional finite element model of the tire was established.Different tread patterns were designed for the same carcass，and the linear regression equation between tire rolling resistance and contact characteristic parameters between the tread and carcass was established by using the principal component regression method.The effect of contact characteristics parameters between different patterns tread and carcass on tire rolling resistance were studied.The results showed that length factor of second long axle，length factor of third long axle，contact factor and contact shape factor had a greater impact on the rolling resistance，average contact pressure，length of second long axle，length of third long axle and length of contact long axle were the second，maximum contact pressure and contact area were small.