低温固化静电植绒胶的研制

以丙烯酸系单体和环氧树脂为原料、OP和十二烷基硫酸钠为乳化剂、K2S2O8为引发剂、N-羟甲基丙烯酰胺(NMA)和甲基丙烯酸为交联剂,采用乳液聚合,在(82±1)℃和变速搅拌下,合成了自交联型可低温固化的静电植绒胶。应用该胶静电植绒时,在80℃的烘干条件下,仅需5min即可固化。由该胶所制得的植绒产品干磨4000次不见底;湿磨1300次不见底;柔软度3.8cm。     

汽车橡胶密封条静电植绒光照老化耐磨性能研究

研究汽车橡胶密封条光照老化后静电植绒耐磨性能的影响因素。根据植绒粘合剂光照老化机理和静电植绒生产工艺,分析植绒前密封条表面温度、等离子体表面处理、粘合剂的厚度、静电植绒环境、粘合剂固化温度等工艺条件对光照老化后植绒耐磨性能的影响。通过调节蠕动泵的出胶量提高植绒粘合剂的干膜厚度,提高两段固化烘箱的温度使密封条表面温度达到180℃以上,汽车橡胶密封条植绒光照老化后耐磨性能达到企业标准要求。     

新型无甲醛静电植绒粘合剂的合成及应用

通过半连续种子乳液聚合法,采用无羟甲基活性单体作为交联剂,成功研制出新型无甲醛静电植绒粘合剂。系统研究了共聚物Tg对聚合乳液性能的影响以及不同上胶量和焙烘温度对植绒效果的影响;通过红外和差示扫描量热法表征了聚合物的结构。实验结果表明,当Tg为-20℃时,所得聚合乳液各项性能指标优异;在静电植绒时,上胶量为250g／m^2,焙烘温度为140℃,时间为4min,所得植绒织物植绒牢度≥5800次,弯曲长度为1．97cm,手感柔软,半衰期为0．61s,抗静电性能优良,各项指标均达到了静电植绒织物FZ／T64011—2001一等品的标准。     

铝型材粉末涂料静电喷涂固化工艺过程的分析

用差示扫描量热法(DSC)对聚酯/TGIC铝型材专用粉末涂料的非等温固化反应进行了研究,分析了粉末涂料固化反应过程,采用温度-升温速率图外推法确定了该体系的特征参数凝胶温度(To)、固化温度(Tp)和后处理温度(Tf)分别为122℃、150℃、206℃;通过DSC测试分析,确定了该体系粉末涂料的最低固化温度为120℃左右,静电喷涂较佳的固化工艺参数为200℃/20 min,为铝型材粉末涂料静电喷涂固化工艺过程控制的确定提供了重要的参考依据。     

新型HT—0011环氧树脂潜伏性固化剂

湖北回天胶业股份有限公司最新研究开发一种新型环氧树脂潜伏性固化剂 ,该产品处于国内领先水平 ,属于胍、脲衍生物 ,具有固化及固化促进效果 ,可完全替代双氰胺、二酰肼类潜伏性固化剂。固化环氧树脂的温度降至 80～ 1 0 0℃ ,比纯双氰胺或二酰肼的固化温度 1 70～ 1 80℃ ,降低了近 1 0 0℃ ,并且在室温下具有良好的潜伏性 ,较长的贮存期 ,良好的环氧树脂固化性能。主要技术指标1、外观 :白色至灰黄色粉末2、粒度 :80～ 1 2 0目3、固化条件 (配单组分液体环氧胶 ) :固化温度 /℃ 80 1 0 0 1 2 0 1 40 1 6 0 1 80固化时间 /ｍｉｎ 1 80 6 0…     

信息

自交联型丙烯酸酯乳液研制成功一种用于静电植绒、无纺布等粘接的自交联型丙烯酸酯乳液近期在福建纺织化纤集团精细化工公司开发中心研制成功。该乳液以丙烯酸乙酯、丙烯酸丁酯、丙烯酸异辛酯、Ｎ -羟甲基丙烯酰胺等为主要原料 ,经种子乳液聚合制得 ,可以加氨水调整乳液粘度至使用要求的稠度 ,属碱增稠型乳液 ,经有关部门检测 ,符合静电植绒等用途的要求指标 ,具有附着力大、耐水耐洗磨、不脱绒等优点。粘度 (增稠前 ) :3 0 0～ 3 5 0ｍＰａ·ｓ(2 5℃ ) (增稠后 ) :2～ 4万ｍＰａ·ｓ,固含量 :42± 1 %。 (陈元武 )接枝型氯丁 -酚醛胶研制…     

静电植绒胶的研制

本文介绍了静电植绒胶的合成工艺，讨论了单体、乳化剂、引发剂、温度等对产品性能的影响。使用该静电植绒胶生产的植绒产品具有优良的耐磨牢度和柔软的手感。     

简讯

聚丙烯国酯－环氧树脂常温固化静电植绒粘结剂吉林省石油化工设计研究院采用互穿网络（IPN）合成技术，以聚丙烯酸酯及环氧树脂为原料，制备成功在纺织纤维和服装加工行业有实用价值的新型粘结材料——常温固化静电植绒粘结剂。其技术特点为：常温固化不损害被加工物基层结构，粘结强度可靠，既适于继续作业亦适于间歇性静电植绒，应用范围广。王沛嘉963皮革特效胶在沈研制成功沈阳化工学院研制成功一种不含苯类溶剂，不污染环境，不损害健康，无毒无味，快干、防冻的963皮革特效胶。涂胶一遍，晾置3－5分钟即可粘合，初粘力大，粘结强度…     

环氧-醚胺胶黏剂的增韧改性研究

研究了端胺基液体丁腈橡胶（ATBN）改性环氧-醚胺体系的固化反应及胶黏剂的粘接性能。根据Ellerstein法计算固化反应活化能为77.3kJ/mol^-1,根据峰值法计算固化反应活化能为63.7kJ/mol,该体系最佳固化温度为39～82℃。经过对胶黏剂的粘接性能和和增韧相态的研究,发现在该固化体系中所形成橡胶相的粒径大小对胶黏剂的性能有较大影响,实验证明该体系在60℃固化温度时分散相粒子平均粒径为1～2μm,在室温固化条件下分散相粒子平均粒径为2～4μm,分散相中橡胶粒子粒径小于2μm时体系增韧效果最佳,胶黏剂具有优异的粘接性能。     

低温固化聚丙烯酸酯植绒粘合剂的合成

采用MA、BA为软单体,MMA为硬单体,NMA和AA为交联单体,OP和SDS为乳化剂,过硫酸钠为引发剂合成可低温固化的聚丙烯酸酯植绒粘合剂.研究了单体用量及配比、引发剂用量、乳化剂用量及配比、温度等因素对单体转化率的影响,确定较好的工艺条件.应用该粘合剂植绒时,100℃/6min固化,植绒产品手感柔软,各项指标均达到标...     

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。