一种环保型水性聚氨酯胶粘剂的制备与性能研究

以聚酯多元醇、二苯基甲烷二异氰酸酯(MDI)和二羟甲基丙酸(DMPA)等合成了水性聚氨酯胶粘剂。对含有亲水性羧基的高分子聚氨酯的制备过程进行了分析,实际应用结果表明:要合成性能优异的水性聚氨酯胶粘剂,需要采用水性聚氨酯乳液、固化剂、无机填料和助剂,这种高级材料制备的聚氨酯胶粘剂外观好、剥离强度强;将NMP作为溶剂,能够提高预聚体反应效率;如果要得到外观较好的半透明乳液,预聚体中DMPA用量必须控制在6%~8%左右,这些研究成果具有明显的理论和实际意义。     

聚醚型聚氨酯鞋用胶粘剂的研制

采用聚四氢呋喃（PTHF）为柔性链段，制备端羟基聚氨酯预聚体，并就聚醚段相对分子质量控制，聚醚段相对分子质量对聚氨酯胶粘剂粘接力的影响等进行了研究。本胶粘剂可用多异氰酸酯为固化剂室温固化，适用于冷粘制鞋等行业。     

高性能水性聚氨酯胶粘剂

综述了国内外水性聚氨酯进展概况,指出亲水性单体引入聚氨酯预聚体后自乳化是目前制备水性聚氨酯的主要方法。探讨了改进和提高水性聚氨酯性能的途径和方法,最后对发展我国高性能水性聚氨酯胶粘剂进行了展望。     

高性能水性聚氨酯胶粘剂

综述了国内外水性聚氨酯进展概况 ,指出亲水性单体引入聚氨酯预聚体后自乳化是目前制备水性聚氨酯的主要方法。结合作者一些实际工作经验探讨了改进和提高水性聚氨酯性能的途径和方法 ,最后对发展我国高性能水性聚氨酯胶粘剂进行了展望     

一种易乳化的阳离子型水性聚氨酯分散体的制备

为了解决阳离子型水性聚氨酯制备后期黏度较大、乳化困难的问题,通过改变亲水扩链剂的投料方式,得到一种工艺可控、易乳化的阳离子型水性聚氨酯分散体的制备方法。首先合成一种异氰酸酯封端的聚氨酯预聚体,将其逐步滴加到阳离子型亲水扩链剂的底料中,制备一种黏度适中、易于乳化的阳离子型聚氨酯预聚体,再将其乳化后得到阳离子型水性聚氨酯分散体。研究了滴加时间、聚合温度和保温时间等工艺参数对阳离子型聚氨酯预聚体性能的影响,并对制备的阳离子型水性聚氨酯进行了结构表征和性能对比。     

鞋用水性聚氨酯胶粘剂的研究进展

介绍了水性聚氨酯鞋用胶粘剂制备方法、性能,以及用于提高水性聚氨酯耐水性、耐溶剂性和耐热性能的交联改性技术,综述了水性聚氨酯的国内外研究进展及其在制鞋领域中的应用情况。     

非离子型水性环氧-聚氨酯乳液的制备及性能研究

以异佛尔酮二异氰酸酯(IPDI)、聚乙二醇(PEG)、环氧树脂E-51为主要原料,合成了聚氨酯预聚体接枝改性的环氧树脂,并以改性环氧树脂作为乳化剂,乳化环氧树脂E-51,通过相反转法制备了纳米级的非离子型水性环氧-聚氨酯乳液。采用红外光谱(FT-IR)对改性环氧树脂进行结构表征,通过纳米粒度分析仪和透射电镜(TEM)研究了乳液的粒径和形貌,同时研究了PEG相对分子质量和聚氨酯预聚体用量对乳液稳定性、粒径的影响。结果表明:当PEG相对分子质量为6 000,聚氨酯预聚体含量为20%时,制备的水性环氧-聚氨酯乳液的综合性能最佳,此时所制备乳液稳定性好,粒径小于150 nm。     

双组分无毒无溶剂鞋用聚氨酯胶的研究

介绍一种新型无毒无溶剂型双组分鞋用聚氨酯胶粘剂。该胶以端异氰酸酯基聚氨酯预聚体为Ａ组分，端羟基聚氨酯预聚体和其他固化剂为Ｂ组分。Ａ、Ｂ组分室温下皆呈液态，适于制鞋工业。在加热条件下，固化速度快，且无溶剂挥发，有利于劳动安全和环境保护。     

水性聚氨酯胶粘剂的研制

以低聚物多元醇、二异氰酸酯和二羟甲基丙酸为主要原料制备了一种阴离子水性聚氨酯胶粘剂。探讨了不同种类的多元醇和异氰酸酯对预聚体的合成和乳液性能的影响,实验中发现用三乙胺做中和剂时存在着一个临界浓度。选用多种助剂最后配制得到了综合性能优良的水性聚氨酯胶粘剂。     

专利介绍

<正>水性聚氨酯胶粘剂及其制备CN101 701 140(2010-05-05)。该胶粘剂的制备过程分三个阶段:①逐步聚合阶段,即由低聚物多元醇、亲水单体、异氰酸酯和改性单体等通过逐步聚合和自由基聚合工艺,制得改性聚氨酯预聚体(R值为1.02～2.0);②分散阶段,即中和成盐后改性聚氨酯预聚体在水中均匀分散;③扩链阶段,即加入扩链剂后     

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。