Applied Theory

• WANGjing,MAyangyang and ZHOUzhonghua
• Study on Structural Parameters of Crankshaft Oil Seal Based on Orthogonal Test

• 2021 Vol. 68(2): 0091-0097

  [Abstract](35)

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• Abstract:In order to study the influence of the structural parameters of the engine crankshaft oil seal on the sealing performance of the oil seal，the crankshaft oil seal with the specification of Φ80× Φ100×8.5 was taken as research object.Based on the principle of orthogonal experimental design，combined with finite element analysis method，the order of the influence of the structural parameters which were oil level lip angle（α），gas level lip angle（β），installation interference（δ），axial distance from spring center to lip（r），oil seal waist thickness（s） and spring stiffness coefficient（k） on average contact pressure（Pav） and radial force per unit circumference（Fr） of the lip were studied.The optimization objectives were maximum Pav and minimum Fr，and the optimal combination of structural parameters was obtained.The results showed that the order of the influence of the structural parameters on Pav and Fr were β，δ，k，s，α，r and k，δ，r，s，β，α，respectively.Compared with the crankshaft oil seal before optimization，Pav of the crankshaft oil seal after optimization increased by 2.61%，Fr decreased by 28.74%，and service life was prolonged evidently.

Material · Compounding

• GOU Zhi,GUO Jianhua,HU Xinsong,DENG Lihua and CHENG Xiaolian
• Effect of Metal Hydroxides on Ceramic Properties of RTV Silicone Rubber

• 2021 Vol. 68(2): 0098-0103

  [Abstract](35)

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• Abstract:Ceramizable room-temperature-vulcanized（RTV） silicone rubber were prepared with α，ω-dihydroxyl polydimethylsiloxane（107 silicone rubber） as the matrix and metal hydroxides（aluminum hydroxide and magnesium hydroxide） as the ceramic additives.The effects of metal hydroxides on the properties of the silicone rubber were investigated.The results showed that the mechanical properties of the silicone rubber with magnesium hydroxide decreased significantly，while the mechanical properties of the silicone rubber with aluminum hydroxide did not change significantly.The ceramic residue derived from the silicone rubber with aluminum hydroxide sintered at 1 000 ℃ showed more stable appearance and size，better shape retention and more compact ceramic residue section than those with magnesium hydroxide.The increment of the three-point flexural strength of the ceramic residue derived from the silicone rubber with aluminum hydroxide increased significantly compared with silicone rubber without metal hydroxide.

• LI Li,LUO Gaoxiang,HUO Shilei and WAN Chengcheng
• Effect of Accelerators Type on Rubber-Steel Wire Adhesion and Compound Properties

• 2021 Vol. 68(2): 0104-0108

  [Abstract](34)

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• Abstract:The effects of promoters NOBS，CBS，DZ，TBBS and secondary promoter HMT on rubber-steel adhesion and compound properties was investigated.The results showed that，promoter NOBS was not suitable for rubber-steel adhesion system，promoters CBS and DZ could be used in the rubber-steel adhesion system in an appropriate amount（0.5～1 phr）.When promoter TBBS was used，the rubber-steel adhesion perperty and compound overall performances were better.When promoter TBBS was used with secondary promoter HMT，rubber-steel adhesion perperty and compound scorch safety and curing efficiency were improved，and vulcanizate physics properties showed downward trend.Secondary promoter HMT amount need to be used strict control.

• BianHuiGuang,ZhangMeng,HanDeShang,ZhuXiaoYao and WangChuanSheng
• Effect of Areca Fiber Modified by Coupling Agent Si69-Nanometer Zinc Oxide on Properties of Natural Rubber Composite

• 2021 Vol. 68(2): 0109-0113

  [Abstract](21)

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• Abstract:Natural rubber（NR）composite was prepared by impregnating areca fiber with natural latex. The effect of areca fiber modified by coupling agent Si69-nanometer zinc oxide on properties of NR Composite was investigated.The results showed that，compared with the NR composite of unmodified areca fiber，the physical properties，solvent resistance and wet sliding resistance of the NR composite modified by coupling agent Si69-nano zinc oxide were improved，the shear modulus was reduced，and the rolling resistance was increased.The comprehensive properties of NR composite modified by coupling agent Si69-nano zinc oxide were better than that of NR composite modified by coupling agent Si69 and nano zinc oxide alone.

Product · Design

• ZHAO Miaomao and DUAN Yuxing
• Development of a Three-dimensional Equal Stiffness Rubber Shock Absorber

• 2021 Vol. 68(2): 0114-0118

  [Abstract](28)

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• Abstract:According to the classical vibration isolation theory，rubber material constitutive model and finite element simulation technology，the vibration isolation analysis of a satellite inertial equipment was carried out，and a three-dimensional equal stiffness rubber shock absorber was developed.The results showed that the rubber shock absorber was made of wide temperature range and high damping silicon rubber and metal materials.Under the three-dimensional vibration frequency of （75±5） Hz and impact environment，the vibration response value of equipment with rubber shock absorber was reduced from 19g（g was gravity acceleration） to 7.7g，and the impact value was reduced from 8 000g to 500g，which met the damping requirements of inertial equipment.

Technology · Equipment

• CAI Lei,ZONG Xin,ZHANG Xinping and HE Aihua
• Effect of Curing Time on Crosslinking Network Structures and Properties of Tread Compound of Green Tire

• 2021 Vol. 68(2): 0119-0127

  [Abstract](33)

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• Abstract:For the green tire tread compound with solution polymerized styrene-butadiene rubber （SSBR）/butadiene rubber（BR） blend as the main material，the changes of the crosslinking network structures and physical properties of silica filled SSBR/BR blend（referred as filled silica system compound）and silica unfilled SSBR/BR blend（referred as unfilled silica system compound） under different curing time were studied.The results showed that，for silica unfilled system compound，with the prolonging of the curing time，the crosslinking density of the vulcanizates decreased slightly，the hardness，modulus，tensile strength and rebound value were changed little，the tear strength increased，the elongation at break and tensile fatigue properties decreased.For the silica filled system compound，with the prolonging of the curing time，the filler networks structural degree of the vulcanizates was improved gradually，the crosslinking density increased，the polysulfide bonds with lower bond energy were fallen，the mono- and di-sulfur bonds with higher bond energy were grown，the tensile strength，rebound value，tensile fatigue property and wear resistance were basically unchanged，the heat build-up and rolling resistance decreased.The aging resistance of the two system vulcanizates were both improved with the prolonging of curing time，which showed that the tread compound with SSBR/BR blend as the main material had better properties even though it was cured at high temperature for a long time.unfilled SSBR/BR vulcanizates improve with increasing curing time.

• Jiao Dongmei,Li Dongyan,Zhang Tao,qinjian and Tian Zhongke
• Optimization Design of Wire Cladding Head

• 2021 Vol. 68(2): 0128-0133

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• Abstract:The flow field of the wire cladding compound was analyzed by ANSYS software，and the influence of flow channel structure parameters and process parameters of cladding head on the wire cladding quality was studied.The optimized design of the wire cladding head was carried out according to the simulation results.The results showed that when the forming section length of the wire cladding head was 28 mm，the external cone angle of die core was 39°，the internal cone angle of die sleeve was 45° and the traction speed of core line was 0.16 m·s-1，the extrusion of the compound was uniform and the wire cladding quality was good.

Testing · Analysis

• liuhaihong,cui zhe and fu peng
• Study on the cytotoxicity of synthetic polyisoprene rubber

• 2021 Vol. 68(2): 0134-0139

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• Abstract:Medicinal polyisoprene rubber（IR0307 and IR80） synthesized by two different catalytic systems were used as the research object，when sodium chloride injection with mass fraction of 0.9% and purified water were used as extraction media respectively，IR0307 and IR80 were extracted under two extraction conditions，such as extraction at 121℃ for 60 min in autoclave or extraction at 37 ℃ for 24 h in close-container.The cytotoxicity of IR0307 and IR80 were determined by microscopic observation and tetrazolium salt colorimetry，and the cytotoxicity reaction grade of IR0307 and IR80 under different extraction conditions were analyzed.In medical polyisoprene rubber，it was suggested to control the residual amount of catalyst and the content and types of impurities and metal ions，and use clean non-pollutiong anti-aging agent and stabilizer.

Gomprehensive and Special Review

• Wang Ruijia,Yong Zhanfu and Yang Yongbao
• Research Progress of Tire Wear and Tire Dynamic Performance Change

• 2021 Vol. 68(2): 0140-0145

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• Abstract:The research progress of tire wear and tire dynamic performance change were overviewed.The typical research methods of tire wear included theoretical analysis method，finite element simulation method and experimental testing method.With the continuous development of numerical calculation theory，finite element simulation method might well become the main method of tire wear research.The change of tread morphology and attenuation of material properties caused by tire wear would affect tire dynamic performance.The research on this problem could guide the wear resistance design of tire，especially electric vehicle tire，in the whole life cycle from the perspective of dynamic performance change，and promote the technical upgrading of tire industry.

• LI Zhifeng,LYU Mingzhe,LI Yongzhen and LIU Yunhao
• Development of Natural Latex Gloves and Synthetic Latex Gloves

• 2021 Vol. 68(2): 0146-0153

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• Abstract:The origin and development of natural latex gloves were introduced，and the application，specification，characteristic and appearance of natural latex inspection gloves，surgical gloves，fabric impregnation protective gloves，household gloves and industrial gloves were also summarized．It was pointed out that the insufficient safety and serviceability of natural latex gloves promoted the development of synthetic latex gloves and artificial latex gloves．Due to the technical advancement and cost reduction，nitrile latex inspection gloves have become the main competitor of natural latex inspection gloves，low protein powder-free natural latex surgical gloves，chloroprene latex surgical gloves and polyisoprene latex surgical gloves have become the main choice of medical staff with natural latex allergy．In the non-medical field，synthetic latex gloves and artificial latex gloves were suitable for special caring prevention．

• zhuoyangpeng,liaoshuangquan,liaoxiaoxue,Zhang cheng,fubo,zhaoyanfang,liwangzhen and chengzhenan
• Research Progress on Extraction and Properties of Dandelion Taraxacum Koksaghyz Rubber

• 2021 Vol. 68(2): 0154-0159

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• Abstract:The components of dandelion taraxacum koksaghyz（taraxacum koksaghyz for short） were introduced，the extraction methods，molecular structure and properties of taraxacum koksaghyz rubber were summarized，the development prospect of taraxacum koksaghyz rubber was profiled.Taraxacum koksaghyz rubber is a perennial herb of compositae，its rhizome contains a lot of rubber components.The rubber extraction methods of taraxacum koksaghyz could be divided into latex extraction method，solid rubber extraction method and latex/solid rubber extraction method.The taraxacum koksaghyz rubber was cis-polyisoprene.The preparation of taraxacum koksaghyz rubber could alleviate the shortage of natural rubber resources in China.

国内外动态

• 赵敏
• 低密度粘接型阻燃硅橡胶及其制备方法

• 2021 Vol. 68(2): 0090-0090

  [Abstract](22)

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• 吴淑华
• 益阳橡机数字化云平台项目验收

• 2021 Vol. 68(2): 0090-0090

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• 吴淑华
• 创新引领 为橡胶行业高质量发展提供高品质骨架材料

• 2021 Vol. 68(2): 0097-0097

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• 赵敏
• 一种用于建筑3D打印的橡胶粉超高延性砂浆及制备

• 2021 Vol. 68(2): 0108-0108

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• 赵敏
• 一种耐高温可瓷化动密封橡胶材料及其制备方法

• 2021 Vol. 68(2): 0108-0108

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• 赵敏
• 一种橡胶制品回收利用处理系统及回收处理工艺

• 2021 Vol. 68(2): 0108-0108

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• 赵敏
• 一种含凹凸棒土的溴化丁基橡胶/聚丙烯热塑型弹性体组合物及其制备方法

• 2021 Vol. 68(2): 0108-0108

  [Abstract](23)

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• 赵敏
• 一种防火减震硅橡胶及其制备方法

• 2021 Vol. 68(2): 0118-0118

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• 赵敏
• 一种新型橡胶卫生防护地垫及其制备方法

• 2021 Vol. 68(2): 0118-0118

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• 赵敏
• 一种三元乙丙橡胶组合物

• 2021 Vol. 68(2): 0118-0118

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• 赵敏
• 户外鞋底加工用轻质防滑型橡胶纤维复合材料

• 2021 Vol. 68(2): 0127-0127

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• 赵敏
• 一种丙烯酸酯-丁腈橡胶材料及其制备方法

• 2021 Vol. 68(2): 0127-0127

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• 赵敏
• 天然橡胶胶乳常温保鲜剂及其制备方法、使用方法及应用

• 2021 Vol. 68(2): 0127-0127

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• 赵敏
• 一种氯磺化聚乙烯橡胶及其生产工艺

• 2021 Vol. 68(2): 0127-0127

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• 赵敏
• 一种橡胶电缆料及其制备方法

• 2021 Vol. 68(2): 0139-0139

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• 赵敏
• 一种楼面防水用改性纳米硅氟橡胶及其制备方法

• 2021 Vol. 68(2): 0139-0139

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• 赵敏
• 一种硅橡胶按键及其制备方法

• 2021 Vol. 68(2): 0139-0139

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• 吴淑华
• 印度财政部税务局发布海关令：撤销进口中国尼龙帘布反倾销税

• 2021 Vol. 68(2): 0153-0153

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Special Contribution

• LIU Chen,LI Fan-zhu,LU Yong-lai and ZHANG Li-qun
• Structural Design and Mechanical Properties of Non-pneumatic Tire

• 2021 Vol. 68(2): 0083-0090

  [Abstract](33)

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• Abstract:The advantages of pneumatic tires，such as lower energy loss when rolling on rough pavement，and smaller vertical stiffness，contact pressure and load quality，as well as the defects of burst，non-puncture resistance and unstable operation are described.The structure and mechanical properties of two kinds of typical non-pneumatic tires namely，spoke-type non-pneumatic tires and honeycomb-type non-pneumatic tires are introduced.Compared with traditional pneumatic tires，not only the vertical stiffness and contact pressure of non-pneumatic tires can be decoupled，but also the vertical stiffness，lateral stiffness and torsional stiffness are no longer strongly coupled，which greatly expands the variable space in the tire design.And the non-pneumatic tires performance can be effectively optimized only by adjusting the structure and geometric parameters of the shear band and spokes.However，there are many problems with non-pneumatic tires，which are still in the experimental stage.In the future，the market demand of non-pneumatic tires will continue to expand，and its structure and mechanical properties will continue to improve，and these will make non-pneumatic tires a major variety in the field of tire.