国外专利

塑料粘接用热熔胶JP08325539（96．2．10）热熔胶组成物（P）含有：100份乙烯／醋酸乙烯共聚物（A）（醋酸乙烯含量＜25Wt％、熔融指数大于2）；1～150份无定形聚烯烃（B）［数均分子量为1000～20000、熔融粘度（190℃）为50～100000cPa·s、丙烯含量＞30wt％］；50～300份增粘树脂（C）和0～100份蜡（D）。用途：（P）适用于粘接PE、PP类塑料。优点：粘接PP膜、室温下粘接强度为3kgf／25mm，40t时，粘接强度为正．skgf／25mmo书籍装订用热熔胶JP08325547（96．12．10）该热熔胶（P）熔点为50～120℃、不溶于40t以下的冷水、在40℃…     

PP-R铝塑复合管用热熔胶的研制

将PP／HDPE用马来酸酐(MAH)进行熔融接枝改性制得PP—R铝塑复合管用热熔胶树脂，红外光谱分析证实MAH确已接枝到树脂上。当HDPE比例占40％，MAH接枝率0．7％时，树脂与铝箔和PP—R有最大的剥离强度。在该树脂中添加10％的增粘树脂、40％的粘度调节剂后，获得了剥离强度达135N／cm的热熔胶。     

外国专利摘录

室温固化环氧腻子CS276631（1992．7．15），5页。组成为环氧树脂400，滑石粉500，铁粉100，二乙烯二胺40，水扬酸100克。胶适用期3．0～3．5h（15～20℃）或2．5～3．0h（20～25℃）。用于修补金属件表面缺陷如收缩孔和铸铁件细孔。热塑性聚烯烃热熔胶HenkelK．－G.a.A，DE4226081（1994．2．10），10页。无定形聚a-稀烃40，等规聚丙烯15，高支链的异链烷烃的聚a-烯烃11，石蜡2．8，抗氧剂0．2,萜烯-酚醛树脂31份配成。热熔胶具有较高热扭变温度和韧性，低伪熔融粘度和玻璃化温度。导电胶Fraunhofer－GesellschaftJurFoerderungderAn…     

热熔胶用聚氨酯弹性体的合成

以4,4’-二苯基甲烷二异氰酸酯（MDI）、聚乙二醇（PEG）和I,4-丁二醇（BIDO）为原料合成聚氨酯弹性体,采用流延法制备了热熔胶膜。考察了预聚反应的温度、时间对聚氨酯弹性体性能的影响,并对预聚体中NCO含量、异氰酸酯指数（R）、聚醚多元醇的种类以及相对分子质量等进行了探讨。确定了最佳反应条件：反应温度为（80±5）℃;反应时间为1．5～2．0h。预聚体中NCO质量分数控制在9％～10％,R值取1．02,选用相对分子质量为1500的PEG制备的热熔胶用聚氨酯弹性体性能优异。     

台湾省期刊摘录

热熔胶最新趋势台湾热熔胶工业于1978年开端，至1992年生产已达1102，平均年增长15％，金额5．42亿元．其中内需和外销出各占一半．在应用上以EVA系热熔胶使用量最高一年约3600t．出口以香港占最多，达2148t，主要是转口至大陆。美国1990年消费589703t，预估1995年达620000t以上，每年以5％增长。其中聚烯烃类用量最多，达336，131t，占57％，其次嵌段共聚体123838t，占21％。主要用途是包装、压敏胶带、标签、无纺布、订书、纸尿布、装配等．欧洲市场每年以5％增长，1990年消费达257340t，聚烯烃系占60％，嵌段共聚体其次，达41174t。主…     

反应型EVA热熔胶

中国专利CN101070455（2007—11—14）公布了一种反应型EVA热熔胶的配方：EVA树脂55—85份、增粘剂25—45份、过氧化二异丙苯0．01—0．6份,过氧化苯甲酰0．01—0．5份、1,2-二乙烯基苯0．01—0．5份。由于反应型EVA热熔胶的分子结构由线型转变为交联型结构,因而显著地提高了内聚强度、粘接强度、耐热性和耐溶剂性等,可在某些方面代替尼龙、聚酯、聚氨酯等类型热熔胶。     

四元共聚丙烯酸酯热熔压敏胶膜的合成研究

以丙烯酸-2-乙基己酯(2-EHA)、甲基丙烯酸甲酯(MMA)、丙烯腈(AN)和丙烯酰胺(AM)为共聚单体,采用预乳化法制备聚丙烯酸酯热熔胶,研究了单体用量配比,乳化剂用量、配比及乳化方式,引发剂用量,温度和滴加速度对反应及性能的影响。结果表明：2-EHA/MMA 1/0．6,AN 5％,AM 5％,复合乳化剂3．0％,引发剂过硫酸钾0．3％,80～85℃,反应4h,丙烯酸酯橡胶分子量在10万以上时,制得的热熔压敏胶膜综合性能良好。     

EVA热熔胶对金属与塑料粘结性能的研究

研究了乙烯与醋酸乙烯共聚物（EVA）热熔胶及其主要成分，讨论了不同成分配比对热熔胶粘结性能的影响，最终确定当m（EVA）：m（松香）：m（石蜡）=100：60：20时，热熔胶对金属和塑料的粘结剪切强度最大为3．46MPa。填料碳酸钙质量分数小于10％可降低生产成本且剪切强度下降不大。质量分数超过10％时，剪切强度明显下降。     

消息动态(2)

织物用PU热熔胶Bostic公司的Supergrip2000／9716是一种100％因含量聚氨酯热熔胶粘剂。它具有高弹性、良好的初粘性及耐水解性等优点，可用于高弹性织物和服装。这些织物有望用于病员眼、雨衣、护膝及其他保护用品。此热熔胶在环境湿气中固化。典型物性为：100C粘度25Pa．s，0．13mm厚的薄膜测得的拉伸强度为6．55MPa．伸长率350％．且在撤去外力后完全回复原形。刘益军摘译自AdhesivesAge，1997．40（10）：10PU汽车仪表板在美国芝加哥的NPE’97上展示了两种全聚氨酯仪表板。一种是采用BASF公司新型聚聚氨酯原料ElastolitM制得的…     

抗旱型复合种衣剂

抗旱型复合种衣剂，其各种成分的质量百分比为：高分子超强吸水剂6．0％～8．8％、黄腐酸1．5％～2．2％、克百威15．0％～25．0％、乙酰甲胺磷17．0％～22．0％、多菌灵11．0％～18．0％、福美双13．5％～17．0％、粉锈宁16．0％～18．0％、硫酸锌13．0％～22．5％、硫酸锰1．5％～12．0％、钼酸铵2．2％～4．2％、硼砂1．5％～3．4％、磷酸二氢钾13．0％～18．0％等。此种衣剂提高了防旱抗旱效果，对肥药有缓释作用，增进肥药持续效果，提高作物产量。     

Extraction into a flow of a fluid with a velocity gradient

Unsteady extraction from a system of semi-infinite capillaries to the flow of a fluid with a linear velocity gradient is studied. An assumption that the diffusion in the flow is a quasi-steady-state process is taken to obtain a linear equation for the local mass flux from the pore space, which involves fractional derivatives with respect to time and flow coordinate. Limiting solutions for the total diffusion flux at small and large times that cover the entire time interval are found.     

Electrolytes: From a Thorn Comes a Rose,and from a Rose,a Thorn

In this article we take a stroll through the metaphorical rose garden, part of the flower garden, that is electrochemical storage systems. We take a closer look at batteries as the center‐pieces – the roses – and especially at the system component of batteries, the electrolyte and its development, throughout history. Just as a rose can only develop its unique beauty when taken good care of and provided with clean water and suitable nutrients, a battery cell cannot function without its electrolyte; the seemingly trivial component that has to juggle a multitude of requirements in order to make batteries truly bloom.     

Propagation of a burning front over a condensed material from a focus

Measured propagation speeds are given for the combustion front in a blind gap in a condensed substance, which are related to gap height and mean pressure. The front may propagate monotonically, which is characteristic of relatively high pressures and wide gaps, or as a result of additional burning foci arising at a certain distance from the main front. At low pressures and particularly with small gap heights, the front propagates in an unstable fashion over the surface.Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 28, No. 4, pp. 49–53, July–August, 1992.     

Mesomorphic transitions in a mixture of a flexible and a semi-rigid polymer

Phase studies on a mixture of two polymers are presented, one of which is mesomorphic. We have systematically examined the influence of the molecular weight of the flexible polymer (including the oligomers) and of the semi-flexible polymer. In addition to the effect of the molecular weight, specific interactions are important for compatibility and formation of a homogeneous mesomorphic phase. The nature of this phase is demonstrated to be cholesteric and the pitch is determined.     

When is a Beam a Plate?

Formulas associated with simple beam or plate theories are used extensively in structural design, to determine You's modulus, and to determine fracture strength of brittle nonmetallic materials. The question may arise as to whether the proper ratio of beam-width-to-beam-depth is such that the bent structural element can be considered as a beam and, if not, what is the correction factor that should be used with the simple beam formula. These questions are answered for a range of structural metallic and brittle nonmetallic materials.     

Laminar flow deformation of a droplet adhering to a wall in a channel

We study the deformation of oil droplets of varying viscosity adhering to a solid, rigid wall in a rectangular channel induced by a pressure-driven, laminar flow of water. Our experimental investigation involves the systematic study of the effects of initial droplet volume, flow rate and viscosity ratio on the various modes of droplet motion and deformation; this is performed via direct visualisation of the flow in a glass cell using a high-speed camera. Our results are used to construct flow maps that delineate the critical conditions for droplet ‘sliding’, ‘crawling’ and detachment from the channel wall as a function of system parameters. Comparisons of our experimental results with numerical predictions obtained using a procedure based on the diffuse-interface method yield reasonably good agreement for certain flow regimes.     

Detonation of a Column of a Chemically Active Bubbly Medium in a Liquid

The problem of a detonation wave propagating in a cylindrical column of a chemically active bubbly medium screened by a liquid from the tube walls is formulated and numerically solved within the framework of the Iordanskii–Kogarko two-phase model with allowance for energy dissipation due to acoustic radiation of bubbles. The wave structure of the reaction zone and the detonation velocity of the bubbly medium column are calculated. It is found that the self-sustaining wave can propagate with a velocity greater than the velocity of one-dimensional bubble detonation by a factor of 1.5–2.5.