PVC门窗与洞口安装预留间隙的设定

PVC塑钢门窗 ,作为建筑门窗更新换代的节能产品 ,与其他门窗相比 ,以其特有的隔热保温、密封、隔音、耐腐蚀、易装饰、寿命长等优势 ,近几年来在我国已逐步得到各界人士的认同。为进一步推广应用PVC塑钢门窗 ,必须研究塑钢门窗在推广应用过程中存在的各种质量问题 ,进行有效的控制和改进 ,全面提高PVC塑钢门窗质量。只有PVC塑钢门窗质量上去了 ,才能真正发挥其优势 ,PVC塑钢门窗的推广应用才会大有前途和希望。本文拟就PVC塑钢门窗设计过程中塑钢门窗与洞口间预留安装间隙的正确设定、提高塑钢门窗安装质量的问题作一些探讨。1　设…     

简讯

广东硬质PVC管材和型材生产应用情况据广东新型建材发展应用研讨会信息，经过10多年发展，广东硬质PVC管材和门窗型材生产已具有相当规模。现有PVC管材生产厂数十家，管材年产量约10万吨，管件生产量约3000吨。全省规模较大的PVC塑钢门窗生产厂6～7家，拥有奥地利、德国、意大利等国先进塑钢门窗生产线近50条，年总生产能力约30万m2。目前广东塑料管道普及率约20％。新建房屋使用塑料管道的约占40％。到2000年塑料管和塑料门窗普及率将分别达到30％和10％。上海新住宅将全部使用塑钢门窗钢门窗已使用半个多世纪。由于其与塑钢门窗相比…     

简讯

化学工业发展目标据悉,有关部门确定从现在起到2010年化学工业三大发展目标如下表：PVC塑钢门窗用丙烯酸树脂涂料研制成功北京圣达光化工研究所开发出PVC塑钢门窗专用的丙烯酸树脂,并投入批量生产。其主要用途是配制PVC塑钢门窗和PVC卷材等装饰用的涂料。最近保定保塑油墨有限公司应用该种树脂研制成功PVC钢塑门窗专用涂料。该涂料对PVC塑料具有附着强、光泽度好、硬度高和耐候性优良等特点。可使塑料门窗由单一本色变得更加绚丽多彩。北京禁用超薄型塑料包装袋北京市政府规定,从1998年1月1日起,全市农贸市场、商业网点等场所禁…     

广东硬质PVC管道和型材生产应用情况

据广东新型建材发展应用研讨会信息,经过10多年发展,广东硬质PVC管材和门窗型材生产已具有相当规模。现有PVC管材生产厂数十家,管材年产量约10万t,管件年产量约3000t。全省规模较大的PVC塑钢门窗生产厂6～7家,拥有奥地利、德国、意大     

四滑道无橡胶条塑钢门窗

我国首创四滑道无橡胶条塑钢门窗系列产品,日前被国家知识产权局批准为中国国家专利产品。 由辽宁葫芦岛金驰塑材有限公司研发生产的90A、B系列四滑道PVC门窗,与传统塑钢门窗的最大不同在于它结合了欧美两大世界先进水平产品的优点,从而解决了塑钢门窗普遍存在的由于橡胶条自然老化而带来的门窗使用缺陷。该产品采用欧式的多腔式断面设计,使材质有独立的排水     

中科彩色塑钢门窗异型材共挤机上市

一种专门为塑钢门窗异型材生产线配套的PMMA／ASA彩色塑钢门窗异型材共挤机和PVC胶条共挤机，日前在青岛中科塑料机械有限公司开发成功，并正式推向市场，受到用户普遍欢迎。这种彩塑共挤机和胶条共挤机采用PMMA／ASA及PVC专用螺杆，具有塑化好、能耗低，型材表面平整光亮、稳定性好等优点，     

新型彩塑共挤机

一种专门与塑钢门窗异型材生产线配套使用的PM—MA／ASA彩色塑钢门窗异型材共挤机和PVC胶条共挤机，日前在青岛中科塑料机械有限公司开发成功，并正式推向市场，受到用户普遍欢迎。     

产品集锦

新型彩塑共挤机一种专门与塑钢门窗异型材生产线配套使用的PM-MA/ASA彩色塑钢门窗异型材共挤机和PVC胶条共挤机,日前在青岛中科塑料机械有限公司开发成功,并正式推向市场,受到用户普遍欢迎。     

BF(PVC)型塑料门窗生产线填补了国内空白

山东省胶州市顺德塑料机械厂研制的BF(PVC)型门窗生产线,采用国外型材直接顶出技术、切割直接组装技术和特殊混料配方,使PVC粉料在单螺杆挤出机中一次性成型。型材直接组装门窗,省去了牵引、定径平台、焊接等工序,设备价格只有其它塑窗生产线的1/4,门窗生产成本只有普通塑钢门窗的1/2,而设备和产品(塑料门窗)均达到了国家规定的标准,经省级鉴定,填补了国内空白。是目前国内投资最小,生产工艺最简便,收回投资最快的     

在科学发展观引领下持续快速发展中的中国塑料加工工业

极具发展潜力和市场光明前景的几种塑料材料及制品 塑料异型材塑钢门窗已成为被广泛认可并在新老建筑上大量采用的产品,2007年用于塑钢门窗的PVC异型材达标产品230多万吨,近年来销量递增10％以上,年产5万吨、10万吨、20万吨的企业不断涌现。     

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。