高强度丙烯酸酯乳液型压敏胶的研制

采用多元丙烯酸酯单体共聚、尽可能降低乳化剂浓度、加入适量AA和HMAM作复合自交联剂等措施，制备具有高剥离强度的乳液型压敏胶粘剂。     

乳液压敏胶的耐热耐水性研究

采用预乳化种子聚合工艺,在多元丙烯酸酯中添加自交联功能单体N-羟甲基丙烯酰胺和反应型乳化剂2-丙烯酰胺基-2-甲基-丙基磺酸铵盐,研制出性能优异的耐热耐水型乳液压敏胶。同时讨论了自交联功能单体、反应型乳化剂、种子乳液的用量对压敏性能的影响。     

室温自交联型丙烯酸树脂-壳聚糖复合乳液的制备及涂膜性能

通过共聚将功能单体乙酰乙酸基甲基丙烯酸乙酯(AAEM)引入丙烯酸树脂分子链中,在制备的丙烯酸树脂乳液中添加壳聚糖,形成室温自交联型壳聚糖-丙烯酸树脂复合乳液。经FT-IR证实了壳聚糖与AAEM单体之间交联反应的发生,通过测试涂膜吸水率、接触角、Tg、抗张强度及断裂伸长率等,考察了AAEM-壳聚糖交联体系对乳液涂膜基本性能的影响。实验结果表明:壳聚糖的引入和相互交联网络的形成,可使涂膜具有更好的吸水性和优异的综合性能。     

导读

彭晨等以含酮基的双键封端的PUA-kt功能单体与甲基丙烯酸甲酯(MMA)、丙烯酸乙酯(EA)等单体共聚合成了聚氨酯丙烯酸酯乳液,再加入一定量己二酸二酰肼,制得室温自交联聚氨酯丙烯酸酯乳液,对聚氨酯丙烯酸酯的合成工艺及性能进行了研究,讨论了乳化剂用量对乳液黏度及凝胶率的影响,PUA-kt对乳液黏度及涂膜交联度的影响,ADH用量对涂膜交联度的影响,并用FTIR、TEM、TGA对聚合物进行     

丙烯酸酯—苯乙烯共聚乳液的合成研究

外交联丙烯酸酯－苯乙烯共聚乳液是由丙烯酸、丙烯酸羟乙酯和苯乙烯等单体经乳液共聚而成。本文论述了乳液共聚的工艺条件,讨论了单体比例,乳化剂用量和配比,单体加入方式、等对乳液聚合稳定性,转化率,乳液特性的影响。     

VAc-2EHA-NMA-AA四元共聚乳液的制备

以醋酸乙烯(VAc)、丙烯酸异辛酯(2-EHA)、N-羟甲基丙烯酰胺(NMA)和丙烯酸(AA)为单体,采用预乳化工艺合成了理论玻璃化转变温度Tg为-16℃的自交联共聚乳液;确定了乳液的固含量,考察了表面活性剂用量及pH、聚合温度和聚合时间对乳液质量的影响。     

新型弹性白胶浆的研究

本厂厂家要用带有带有羟基、羧基、丙烯酸酯的多元共聚乳液体系粘合剂；研究了颜料的表面处理、分散工艺、胶浆的流变性及增稠作用等关键技术；制得具有良好总体性能的弹性白胶浆。     

自交联丙烯酸酯-苯乙烯真空镀铝膜-卡纸胶粘剂的研制

介绍了一种可用于幻彩激光彩膜镀铝膜-卡纸复合粘接的胶粘剂的研制,该乳液具有自交联功能,粘接强度大、特别针对幻彩激光镀铝膜的UV处理层具有较强的粘接力。该胶系丙烯酸酯-苯乙烯共聚乳液,含自交联官能单体,适用于高级卷烟及其它镀铝复膜包装材料的制造。     

自交联醋苯丙防水乳液的制备与性能研究

通过种子乳液聚合法制备了有机硅改性的醋酸乙烯酯-苯乙烯-丙烯酸丁酯(醋苯丙)三元共聚防水乳液.通过对乳液红外光谱和透射电镜的分析,发现有机硅成功引入醋苯丙乳液并起到室温自交联的作用,乳胶粒为核壳结构.着重考察了有机硅用量、醋酸乙烯酯单体用量对乳液防水性能的影响.实验结果表明改性醋苯丙乳液的防水性能优于传统苯丙乳液,且成本更低.     

单组分室温自交联聚氨酯丙烯酸酯乳液的合成及性能

以含酮基的双键封端的PUA-kt功能单体与甲基丙烯酸甲酯(MMA)、丙烯酸乙酯(EA)等单体共聚合成了聚氨酯丙烯酸酯乳液,再加入一定量己二酸二酰肼,即得室温自交联聚氨酯丙烯酸酯乳液。对聚氨酯丙烯酸酯的合成工艺及性能进行研究,讨论了乳化剂用量对乳液黏度及凝胶率的影响,PUA-kt对乳液黏度及涂膜交联度的影响,ADH用量对涂膜交联度的影响,并用FTIR、TEM、TGA对聚合物进行表征。结果表明,所合成的乳液固含量35%~37%,凝胶率1%以下,涂膜交联度达到82.5%,附着力0级,柔韧性1 mm。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。