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1.
纪秀俊  余江  金一丰  张玉桥 《广东化工》2022,49(1):53-55,61
采用氰酸钾和3-氯丙基三甲氧基硅烷为原料,以氰化法合成3-异氰酸酯基丙基三甲氧基硅烷.确定了最佳工艺条件:反应温度105℃,催化剂用量1%,投料比n KOCN︰n3-氯丙基三甲氧基硅烷=2.5,保温时间4 h,保护试剂为己内酰胺,最佳用量n己内酰胺︰n3-氯丙基三甲氧基硅烷=1.6,溶剂为N-甲基甲酰胺,添加量为45%...  相似文献   

2.
硫氰基丙基三乙氧基硅烷的合成   总被引:2,自引:1,他引:2  
以硫氰酸盐、γ-氯丙基三乙氧基硅烷[γ-Cl(CH2)3Si(C2H5O)3]为原料,合成了硅烷偶联剂硫氰基丙基三乙氧基硅烷。讨论了硫氰酸盐和溶剂的种类、反应温度,以及硫氰酸盐、γ-氯丙基三乙氧基硅烷、溶剂的配比对反应的影响。结果表明,以硫氰化钾(KSCN)为原料、二甲基甲酰胺(DMF)为溶剂,且KSCN与γ-Cl(CH2)3Si(C2H5O)3、DMF的质量比为1:2.36:2.4--2.5时,在120--130℃回流反应3h,硫氰基丙基三乙氧基硅烷的收率可达82%左右;其应用性能与德国Degussa公司的Si-264相当。  相似文献   

3.
采用咔唑与γ-氯丙基三乙氧基硅烷亲核取代反应,合成了具有光导电性能的γ-咔唑基丙基三乙氧基硅烷(3-carbazole propyl triethoxy silane);通过Chem Office化学软件估算了反应物的电核密度,研究了其合成工艺,用红外及紫外光谱表征了合成产物。  相似文献   

4.
新型硅烷偶联剂硫氰基丙基三乙氧基硅烷合成   总被引:1,自引:0,他引:1  
周兴平 《浙江化工》2003,34(11):10-11
由硫氰化钾与γ-氯丙基三乙氧基硅烷合成硫氰基丙基三乙氧基硅烷,在温度120—130℃回流反应3h,收率82%左右。该硅烷偶联剂应用于多种天然及合成橡胶的补强,偶联效果好。  相似文献   

5.
硅烷偶联剂Si-69的工艺优化   总被引:1,自引:2,他引:1  
以γ-氯丙基三乙氧基硅烷和四硫化二钠为原料,采用程控升温的方法合成了双-[3-(三乙氧基)硅丙基]四硫化物(Si-69)。得出了合成Si-69的最佳工艺条件:Na2S4、γ-氯丙基三乙氧基硅烷和溶剂无水乙醇的质量比为1∶2∶2,反应温度为80℃,反应时间为3h,在此工艺条件下合成Si—69的产率为95·5%,硫的质量分数为22·7%。  相似文献   

6.
γ-氯丙基三乙氧基硅烷的合成研制   总被引:2,自引:0,他引:2  
用三氯氢硅和氯丙烯在氯铂酸催化下合成的γ -氯丙基三氯硅烷 (γ1 ) ,再与无水乙醇反应制得γ -氯丙基三乙氧基硅烷 (γ2 ) ,收率达 90 %以上 ;它可做为各种卤代橡胶的偶联剂 ,也是制备其他硅烷偶联剂的重要原料。  相似文献   

7.
中南大学的陈雷等人以九水硫化钠、硫粉、γ-氯丙基三乙氧基硅烷为原料,甲苯为溶剂,得到双-(γ-三乙氧基硅丙基)四硫化物。较佳工艺条件为:硫与九水硫化钠的量之比为3:1,甲苯与九水硫化纳的量之比为36:1,γ-氯丙基三乙氧基硅烷与多硫化钠的量之比为2.1:1,无水乙醇与多硫化钠的量之比为8:1,反应温度80℃,合成时间3.5h。制得的产品外观淡黄色,  相似文献   

8.
介绍了γ—氯丙基三乙氧基硅烷的化学分析方法,并与气相色谱法进行比较,两者分析结果基本一致。γ-氯丙基三乙氧基硅烷系无色液体,稍重于水,难溶于水,遇水可发生水解反应。可溶于丙酮、乙醇等有机溶剂,  相似文献   

9.
γ-氯丙基三甲氧基硅烷季铵盐的合成工艺研究   总被引:1,自引:0,他引:1  
以γ-氯丙基三甲氧基硅烷、12/14叔胺为原料,碘化钾为催化剂,采用一步反应直接合成出三甲氧基硅烷季铵盐;考察了催化剂用量、原料配比、反应时间以及温度对反应的影响。确定的最佳反应条件为:用乙醇作溶剂,反应温度80℃,在氯气保护下反应39h,叔胺、硅烷、催化剂的量之比为1:1:0.01。  相似文献   

10.
以γ-氯丙基三乙氧基硅烷为原料,在水相中通过相转移催化合成了双-[γ-(三乙氧基硅)丙基]-四硫化物(Si-69).讨论了反应温度、γ-氯丙基三乙氧基硅烷与多硫化钠的量之比、相转移催化荆的用量等对合成反应的影响.水相中合成Si-69的较佳工艺为:γ-氯丙基三乙氧基硅烷与多硫化钠的量之比为2.1:1,相转移催化剂的用量为γ-氯丙基三乙氧基硅烷质量的2%,反应温度80℃,可制得硫含量高于22.8%,纯度高达95%以上的Si-69.  相似文献   

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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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

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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.  相似文献   

19.
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.  相似文献   

20.
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。  相似文献   

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