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1.
以丁腈橡胶(NBR)和聚氯乙烯(PVC)为主体材料,以偶氮二甲酰胺(AC)为发泡剂,以三氧化二锑(Sb2O3)、十溴二苯乙烷(DBDPE)为阻燃剂,用一步模压法制备了阻燃型NBR/PVC泡沫材料,研究了橡塑比、阻燃剂用量对NBR/PVC发泡材料泡孔结构、密度、阻燃性能和力学性能的影响。结果表明:当橡塑比为50∶50,DB-DPE/Sb2O3的用量分别为12、4份时,NBR/PVC发泡材料的综合性能最佳。  相似文献   

2.
分别采用环保阻燃剂十溴二苯乙烷(DBPE)/三氧化二锑(Sb2O3)和聚磷酸铵(APP)对PA6/POE-g-MAH合金进行阻燃改性,同时以纳米有机蒙脱土(OMMT)作为辅助阻燃剂,讨论了阻燃剂种类、用量和配比对合金燃烧性能和力学性能的影响.结果表明:DBPE/Sb2O3在该体系中具有比APP更高的阻燃效率;OMMT与DBPE/Sb2O3和APP在合金的阻燃改性方面具有一定的协同效应;所有阻燃成分对合金的韧性均产生负面影响;DBPE/Sb2O3和APP使得体系的拉伸强度下降,而OMMT发挥了一定的补强作用;当DBPE/Sb2O3与APP组成的复配阻燃体系中二者的用量分别为10份和40份时,合金具有较好的综合性能.  相似文献   

3.
十溴二苯乙烷阻燃改性聚丙烯的研究   总被引:4,自引:0,他引:4  
采用新型阻燃剂十溴二苯乙烷(DBDPE)与三氧化二锑(Sb2O3)复合对PP进行阻燃改性,研究了DB DPE与Sb2O3的协同效应,复合阻燃剂对PP阻燃性能、物理机械性能的影响及其阻燃机理。结果表明DBDPE Sb2O3复合阻燃剂对PP有良好的阻燃作用。  相似文献   

4.
十溴二苯乙烷协同三氧化二锑阻燃PE研究   总被引:11,自引:0,他引:11  
通过采用新型阻燃剂十溴二苯乙烷(DBDPE)与Sb2O3复合对PE进行阻燃改性,研究了DBDPE与Sb2O3的协同效应,复合阻燃剂对PE阻燃性能、热解性能、物理机械性能的影响。结果表明,DBDPE/Sb2O3复合阻燃剂对PE有良好的阻燃作用。  相似文献   

5.
分别采用十溴二苯乙烷(DBDPE)、溴-氮阻燃剂(FRBN)与三氧化二锑(Sb2O3)复配作为阻燃剂,蒙脱土(MMT)作为阻燃剂的协效剂。对ABS进行阻燃改性,研究了DBDPE、FRBN分别与Sb2O3和MMT的协同效应,复合阻燃剂对ABS燃烧性能、热稳定性能和力学性能的影响。研究结果表明,当DBDPE/Sb2O3含量分别为16phr。MMT含量为3phr时。ABS/DBDPE/Sb2O3/MMT、ABS/FRBN/Sb2O3/MMT体系垂直燃烧性能达到FV-0级,且具有较好的综合力学性能。  相似文献   

6.
以丁腈橡胶(NBR)和聚氯乙烯(PVC)为主体材料,以偶氮二甲酰胺(AC)为发泡剂,选用Sb2O3、十溴二苯乙烷(DBDPE)作为阻燃剂,加入硫化剂及其他助剂,用一步模压法制备了阻燃型NBR/PVC泡沫材料。利用扫描电镜(SEM)、氧指数(LOI)等探讨了NBR/PVC橡塑比,阻燃剂用量对NBR/PVC泡沫材料泡孔结构、密度、阻燃性能和力学性能的影响。结果表明,当NBR/PVC质量比为50/50时,发泡材料综合性能最佳;当DBDPE/Sb2O3用量比为9/3时,氧指数为26.4%,燃烧性能等级达到Ⅱ级;当DBDPE/Sb2O3用量为27/9时氧指数可达32%,燃烧性能等级达到Ⅰ级;阻燃剂用量的变化对NBR/PVC发泡材料的密度影响不大,但对力学性能影响较大,随着阻燃剂的增多,力学性能先提高后下降。  相似文献   

7.
十溴二苯乙烷协同三氧化二锑阻燃聚对苯二甲酸丁二醇酯   总被引:7,自引:0,他引:7  
以十溴二苯乙烷(DBDPE)和三氧化二锑(Sb2O3)作为复合阻燃剂,对聚对苯二甲酸丁二醇酯(PBT)进行改性。研究了复合阻燃剂对PBT的燃烧性能、热稳定性能和力学性能的影响,并其对阻燃机理进行了探讨。结果表明,阻燃剂DBDPE/Sb2O3对PBT具有良好的阻燃效果,热稳定性能基本不变,而其拉伸强度、冲击强度和弯曲强度都随阻燃剂用量的增加先增后降,阻燃剂的用量不宜过大。  相似文献   

8.
采用环保型物理发泡剂HFC-365mfc和十溴二苯乙烷(DBDPE)/三氧化二锑(Sb2O3)复合阻燃剂制备了综合性能良好的硬质聚氨酯泡沫(RPUF)绝热材料,探讨了DBDPE与Sb2O3协同阻燃的最佳配比以及在此配比下不同添加量对RPUF的燃烧性能、绝热性能、闭孔率和压缩性能的影响。结果表明,复合阻燃剂对RPUF材料具有良好的阻燃效果,DBDPE/Sb2O3质量比为4∶1时效果最好。在密度约为65 kg/m3的情况下,所制得RPUF材料的阻燃性能随阻燃剂用量的增加而提高,当添加质量分数为30%时,RPUF的氧指数可达30.1,水平燃烧性能也有很大的提高。阻燃剂的加入并不影响材料的绝热性能,导热系数范围为27.3~28.4 m W/(m·K),闭孔率可达93%~96%,力学性能同样能满足对绝热保温材料的要求。  相似文献   

9.
利用阻燃剂十溴二苯乙烷(DBDPE)和协效剂三氧化二锑(Sb2O3)制备了用于阻燃ABS的复合阻燃剂,研究了阻燃剂的复配比及其用量对丙烯腈-丁二烯-苯乙烯(ABS)的阻燃性能及力学性能的影响,同时也研究了增韧剂苯乙烯-乙烯-丁二烯嵌段共聚物(SEBS)、ABS接枝粉料的用量对阻燃ABS的阻燃性能及力学性能的影响,结果表明:十溴二苯乙烷与三氧化二锑复配质量比为4:1时协同阻燃效果较好,其填加量为16份以上时,就可达到UL-94V-0级,阻燃剂的加入对冲击强度影响较大,而对其他力学性能影响并不明显;在含有20份上述复合阻燃剂的ABS中加入15~20份ABS接枝粉料时,冲击强度提高220%,阻燃性能略有下降,而加入相同用量的SEBS,冲击强度则没有提高,阻燃性能下降较大。  相似文献   

10.
研究了十溴二苯乙烷/三氧化二锑(DBDPE/Sb2O3)对高抗冲聚苯乙烯(HIPS)的阻燃性能、热稳定性能和物理机械性能的影响,并对阻燃机理进行了探讨。结果表明DBDPE/Sb2O3,复合阻燃剂对HIPS有良好的阻燃作用。  相似文献   

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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   

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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   

14.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

15.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  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   

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