NBR填充体系和NBR/Zn(MMA)2合金硫化动态力学响应的研究

用MDR2000无转子流变仪研究了NBR、NBR／HAF、NBR／HAF／DOP体系和NBR／Zn(MAA)2弹性体合金硫化过程的动态力学响应。结果表明，随着Zn(MAA)2用量增大，合金体系的焦烧时间、正硫化时间缩短，最高弹性转矩显著增大，表明Zn(MAA)2提高了体系的交联密度和交联速度。当Zn（MAA）2用量为40份时，合金的力学性能优于NBR／HAF和NBR／HAF／DOP硫化胶，而动态力学损耗居于两者之间。     

ABS/HPVC合金的制备与力学性能的研究

研究了采用丙烯腈 -丁二烯 -苯乙烯树脂 (ABS) ,高聚合度聚氯乙烯 (HPVC)为主体材料 ,丙烯酸酯类共聚物改性剂 (ACR)为增容剂 ,并配以其它助剂制备 ABS/ HPVC合金。实验结果表明 ,选择 ABS75 ,HPVC2 5 ,ACR2 ,重质 Ca CO3<10及适量助剂 ,可以制备性能较好的 ABS/ HPVC合金。以 ACR为增容剂 ,同时加入 NBR,能够大大提高 ABS/ HPVC合金的冲击强度。 ACR对 ABS/ HPVC合金的增容效果同 PVC(S- 70 0 )相近 ,但优于 CR。     

Zn(AA)_2对NBR的改性研究

研究了加入丙烯酸锌 [Zn(AA) 2 ]对丁腈橡胶 (NBR)力学性能的影响。结果显示 ,Zn(AA) 2 能显著提高NBR的力学性能。扫描电镜分析表明 ,在硫化过程中 ,Zn(AA) 2 与NBR发生了接枝和交联反应 ,形成了离子键桥键。随着体系中Zn(AA) 2 用量的增加 ,硫化胶的均匀平整相结构逐渐变成网络、平行结构 ,从而使NBR的力学性能得以提高     

凝聚包覆法粉末NBR对SAN的增韧作用

用凝聚包覆法制得的粉末NBR(PNBR)与SAN共混,测定了共混体的Charpy冲击强度,研究了PNBR的性质对共混体冲击韧性的影响。结果表明,含5份包覆剂的线型PNBR对SAN有最佳的增韧效果,当其用量为30份,其共混体的无缺口冲击强度达96kJ/m2。NBR大分子的交联作用及包覆剂含量大于5份都会降低PNBR对SAN的增韧效果。用扫描电子显微镜对共混体冲击断面形貌的分析表明,共混体在无缺口冲击试验条件下出现脆韧转变,其增韧机理以剪切屈服为主兼有银纹化;在缺口冲击试验条件下则为脆性断裂,其增韧机理以裂纹终止为主兼有银纹化。     

动态硫化NBR/PFPA热塑性弹性体的结构与性能

采用动态硫化法制备了共混型的NBR／PFPA热塑性弹性体(TPE),对其相态进行了分析和测试了其力学性能,并系统研究了该弹性体结构与性能之间的关系。实验结果表明,动态硫化NBR／PFPA热塑性弹性体未随质量配比的变化而出现相的转变;分散相的粒径随两相质量配比而改变,其力学性能与分散相的粒径的大小密切相关。动态硫化对热塑性弹性体的结晶行为和结晶度有影响,从而影响了热塑性弹性体的拉伸强度。     

丁腈橡胶/硫酸高铈复合材料的配位交联反应研究

以四水合硫酸高铈(Ce(SO_4)_2·4H_2O)为配位交联剂,采用原位法制备丁腈橡胶(NBR)/Ce(SO_4)_2·4H_2O复合材料,并利用差示扫描量热分析(DSC)、热重分析(TGA)、溶胀平衡法、扫描电子显微镜(SEM)、硫化仪和万能试验机对其进行结构表征和性能测试。结果表明,Ce(SO_4)_2·4H_2O与NBR发生了配位交联反应,配位硫化为一级反应,活化能为14.4kJ/mol;NBR/Ce(SO_4)_2·4H_2O硫化胶具有良好的力学性能,Ce(SO_4)_2·4H_2O起配位交联和补强填充的作用。配位交联硫化体系具有配方精炼、工艺简单的优点,在特定领域将配位交联NBR替代传统共价交联NBR具有可行性。     

动态硫化NBR/CPE/EVA TPE的力学性能

用动态硫化法制备了共混型的NBR／CPE／EVA热塑性弹性体(TPE)，讨论了橡塑并用比、增塑剂用量和填料类型等对热塑性弹性体力学性能的影响。研究结果表明，当橡塑并用比为5／1～10／3、增塑剂用量为20～30质量份、填料炭黑用量为30质量份时，配合合理的动态硫化工艺条件，可以制得物理力学性能和加工性能优异的共混型的热塑性弹性体。这方面的研究尚未见文献报道。     

WCB/HNBR/NBR耐热密封复合材料的制备与性能研究

通过直接共混法制备了白炭黑/氢化丁腈橡胶/丁腈橡胶(WCB/HNBR/NBR)耐热密封复合材料,研究了不同HNBR/NBR共混比、不同硫化体系对复合材料力学性能、压缩永久变形、耐油性能、耐热性能的影响。结果表明,当WCB/HNBR/NBR为30/25/75,在过氧化物/硫磺的共硫化体系下,复合材料综合性能最好,硬度、拉伸强度、压缩永久变形、150℃热空气老化后拉伸强度、浸油后体积变化率分别为58(邵A)、20.97MPa、12%、6.92MPa、11%;随着HNBR用量的增加,复合材料的耐热性能提高,而耐油性和压缩永久变形变化不大;在过氧化物/硫磺的共硫化体系下,复合材料的耐热性、耐油性、压缩永久变形、力学性能都较优异。     

丁腈橡胶/硫酸铁配位交联复合材料的制备与性能EI北大核心CSCD

以硫酸铁(Fe_2(SO_4)_3·7H_2O)为交联剂,采用原位法制备丁腈橡胶(NBR)/Fe_2(SO_4)_3·7H_2O配位交联复合材料,通过差示扫描量热分析、热重分析、溶胀指数、硫化性能测试和力学性能测试表征复合材料的结构和性能。结果表明,Fe_2(SO_4)_3·7H_2O与NBR发生了配位交联反应,配位硫化为二级反应,活化能为37.3 k J/mol;NBR/Fe_2(SO_4)_3·7H_2O硫化胶力学性能良好,拉伸强度可达14.2 MPa,断裂伸长率为992%,Fe2(SO4)3·7H2O在NBR基体中起到了配位交联剂和补强填充剂的作用。     

热塑性弹性体材料的研究进展与市场前景

本文综述了热塑性弹性体 (TPE)材料的发展 ,共混型TPE的动态硫化技术及制备TPE的技术条件 ,评述并展望了其发展态势与方向     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

＂Three Transformations＂ and Standardization

During his inspection in Henan Province in May, Chinese President Xi Jinping stressed to ＂push forward the transformation from China Speed to China Quality, from Made in China to Created in China, and from Chinese Products to Chinese Brand＂. The ＂Three Transformations＂ are the specific requirements and goal of China＇s national development in the context that market should play a decisive role in the allocation of resources.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

SAC Delegation Visits AENOR and Signs Cooperation Agreements

正SAC Administrator Tian Shihong led the Chinese delegation to visit the Spanish Association for Standardization and Certification(AENOR)on September 15,2014.Mrs.Begona Cristeto,the Vice-Minister of Industry,Energy and Tourism of Spain,and Mr.Avelino Brito,the President and CEO of AENOR greeted the delegation.The two sides had a deep and friendly discussion on strengthening the cooperation between China and Spain in the standardization field and promoting the standardization work to support the development of economy and trade in the two countries.