冰箱用PM-2010在环戊烷体系中发泡行为研究

介绍了冰箱保温用聚合MDI的评价方法,同时对烟台万华聚氨酯股份有限公司的冰箱专用聚合MDI原料PM 2010进行评价,并与国外著名品牌的聚合MDI进行比较。从平均密度、密度分析和最大密度差及其它泡沫制品物理性能的比较结果表明,PM 2010可以用于冰箱生产。     

冰箱用环戊烷聚氨酯发泡体系流动性的研究

探讨了冰箱用硬质聚氨酯泡沫塑料发泡体系中催化剂、匀泡剂等因素对物料流动性的影响。结果表明,催化剂对环戊烷发泡体系的流动性影响较大,不同类型催化剂在恰当的用量匹配下可使发泡物料获得较佳的流动性,在物料的爬高性能与泡沫密度分布均匀性方面均有改善;匀泡剂对环戊烷体系的流动性影响主要体现在泡沫密度分布方面,当匀泡剂用量为2．2份时,发泡体系的密度分布最均匀。     

环戊烷体系聚氨酯硬质泡沫发泡流动性能的研究

采用塑料软管流动性试验方法,从泡沫爬高高度、流动指数、密度分布探讨冰箱用聚氨酯硬质泡沫环戊烷发泡体系中催化剂、泡沫稳定剂等因素对物料流动性的影响。结果表明,当复合催化剂PC-5、PC-8、DMP-30用量分别为0．15、0．4、2．2份时,此环戊烷发泡体系的流动性较好。泡沫稳定剂AK-8805对环戊烷体系的流动性影响主要体现在泡沫密度分布方面,当AK-8805用量为2．0份时,发泡体系的密度分布最均匀。     

聚氨酯箱体冰箱

在意大利Plast’97展览会上,Cannon公司展示了一种新式冰箱。冰箱的内外绝热材料采用了不同密度的聚氨酯。     

发泡剂对聚氨酯硬泡保温塑料低温尺寸稳定性的研究

HCFC-141b与水复合制备了复合发泡剂,并对其在低温情况下对聚氨酯硬泡塑料的尺寸稳定性进行的研究,结果表明:当HCFC-141b与水的复合发泡剂制备的聚氨酯硬质泡沫塑料可以用于冰箱保温,密度与尺寸稳定性能满足冰箱在低温下的要求。     

环戊烷—异戊烷混合烃发泡技术在冰箱生产中的应用

介绍碳氢发泡新一代替代技术 :环戊烷 -异戊烷发泡聚氨酯硬泡技术在冰箱生产中的应用情况 ,并从发泡工艺及性能上与环戊烷发泡体系进行了比较。结果表明 ,与环戊烷发泡体系相比 ,环戊烷 -异戊烷发泡体系加工工艺性良好 ,在冰箱发泡灌注量上减少了 7% ,泡沫密度降低 10 % ,同时泡沫的尺寸稳定性好 ,且密度分布较环戊烷发泡体系均匀 ,仅泡沫热导率在常温下测试略微升高 ,导热系数约为 2 1.5mW /m·K ,但泡沫材料在低温状态下保温性能良好 ,使整机能耗维持原有水平 ,可降低发泡生产成本。     

冰箱用硬质聚氨酯泡沫塑料通过省级鉴定

江苏省江阴精细化学助剂厂,研制试产的冰箱用硬质聚氨酯泡沫塑料,采用复合催化系统和复合稳定系统,改变了传统的催化稳定路线,具有导热系数低、密度小、泡沫孔细而均匀、尺寸稳定性好和长期存放稳定等优点,明显地提高了冰箱硬质聚氨酯泡沫塑料的物理性能。江苏省轻工厅于1989年3月18日,在江阴市主持召开了冰箱用硬质聚氨酯泡沫塑料的产     

冰箱级HDPE

美国陶氏公司新推出具有高流动性冰箱级 H D PE树脂 ,商品名为Dow lex IP-51。其适用于温度低达 -1℃的食品硬包装 ,专用于注射成型大型冰淇淋薄壁容器。新树脂性能如下 :密度 0 .947g/ cm3 ,熔体流动速率 50 g/1 0 m in,拉伸强度 1 0 .5MPa,断裂伸长率 3 0 % ,艾佐缺口冲击强度 3 2 J/ m ,弯曲模量 840 MPa。　　据该产品市场经理介绍 ,由于Dow lex IP/ 51的分子量分布宽 ,其流动性实际上与熔体流动速率为 70 g/1 0 m in的材料相当。新材料的密度和熔体流动速率已调至最佳值 ,兼具有良好的冲击强度和刚性 ,透明性较高冰箱级HDPE…     

消息动态

新西兰开发出绿色泡沫用木质素新西兰的一个研究组已开发出了作为PU泡沫原料的天然木质素,这种木质素是由Genesis研究和发展公司的子公司Biojoule从柳木中提取。目前该木质素已用于泡沫配方,经过严格的泡沫性能测试,其性能如导热系数、密度等令人满意。用此木质素生产的泡沫绿色环保、原料连续易得,可以大大减少PU生产对石油的需求。周芩楠编译Urethanes Technology,2007,24(4):26环保泡沫冰箱英国冰箱制造商Precision公开展示了他的第一款商用环保冰箱,该冰箱使用了以植物基多元醇为原料的绝热泡沫,这种泡沫被称之“环保泡沫”,是利用…     

接枝基底胶乳对冰箱板材用ABS树脂性能的影响因素

讨论了接枝基底胶乳包括凝胶含量、粒径大小及分布对冰箱板材用ABS树脂力学性能和加工性能的影响,为特殊品级的ABS树脂开发提供研究基础。     

Research on a noble extinguish material for the underground fire prevention

The three-phase foam consisted of solid, liquid and gas is regarded as a highly effective measure for the underground mine fire prevention. In this study, the three-phase foam technology is introduced and a visualization platform is established to exhibit the foam flow in a physical goaf. The diffusion rule and extinguishing performance for three-phase foam are researched. Test results show that the three-phase foam has a superior heat resistance than expansion foam in the top goaf. The coal heating rate is postponed after the three-phase foam processing and the active functional groups are suppressed effectively. Increasing the foam expansion ratio is adverse to the three-phase foam stability. The field application of three-phase foam was evaluated via the practical extinguishment effect. The marked reduction in the sealed zone temperature and CO concentration proved that the proposed three-phase foam technology was effective on controlling the concealed goaf fire.     

泡沫稳定剂增强泡沫稳定性的研究

泡沫是气体分散于液体中的多相分散体系。气体是分散相,液体是分散介质。制备泡沫的过程中,液体中的气泡在密度差的作用下易在液面上形成以少量液体构成的液膜隔开气体的气泡聚集物——泡沫。泡沫流体是气体组成的气泡分散体系,具有极高的表面自由能,是热力学不稳定体系,所以泡沫会发生衰变,原因普遍认为有两方面：泡沫中液体的析出和气体穿透液膜扩散。泡沫以其独特的性能在钻井、采油、采气、消防等领域中得到越来越多的应用,如泡沫驱油、泡沫钻井、泡沫水泥固井、泡沫酸酸化、泡沫冲沙洗井、泡沫压裂、泡沫采气、蒸汽驱泡沫调剖、泡沫-聚合物复合驱等,     

连续泡沫分离塔回收水溶液中钼(Ⅵ)的研究

以十六烷基三甲基氯化铵为表面活性剂,在连续稳态操作条件下,研究了泡沫塔和填料泡沫塔回收水溶液中微量Mo(Ⅵ)的分离性能。结果表明:随鼓泡区高度的增加,泡沫塔的富集率逐渐增加,回收率逐渐减小;随填料层高度的增加,填料泡沫塔的回收率增加,富集率减小;随泡沫层高度的增加,两种塔的富集率均逐渐增加,回收率均逐渐减小。泡沫塔内的浓度分布基本一致,表明泡沫塔存在较大的液相返混,填料泡沫塔内浓度分布随填料层高度的增加而增大,表明填料泡沫塔的液相返混程度较泡沫塔小。填料的加入有效增大了气液传质面积,提高了气液传质速率。填料泡沫塔的回收率远高于泡沫塔,但富集比略有下降。在实验条件范围内,填料泡沫塔中Mo(Ⅵ)的回收率可达99.8%,富集率可达12.2。     

The effect of surface energy on the heat transfer enhancement of paraffin wax/carbon foam composites

The influence of carbon foam surface energy on heat transfer through paraffin wax/carbon foam composite was investigated. Carbon foam samples were surface treated and their corresponding surface energy values were measured. A theoretical model was formulated to analyze the mass of paraffin wax absorbed for both pristine and surface activated carbon foam samples based on the concept foam wettability. An experimental study was carried out for heating of the wax/carbon foam composite samples to study the phase change heat transfer due to the melting of wax within the foam matrices. The above studies showed that a greater mass of wax was absorbed within the activated carbon foam samples as compared to the pristine sample which can be due to their greater wettability. This resulted in an improvement in heat transfer rate for the activated samples. The total energy storage rate for the activated composite samples was compared with the pristine sample for the same heating duration and an enhancement of more than 18% was observed for the two activated samples. These studies revealed that the surface energy of carbon foams can play an important role in improving the overall thermal performance of wax/carbon foam composites.     

用于环戊烷发泡的组合聚醚的开发

开发了一种能单独用于环戊烷发泡体系的聚醚多元醇ZS-8118,以ZS-8118、匀泡剂、叔胺催化剂、环戊烷、水等原料配制了硬泡组合聚醚。简单讨论了聚醚多元醇品种、匀泡剂及催化剂对发泡体系的影响。结果表明,该组合聚醚贮存稳定性好,制得的泡沫塑料性能优良,能满足冰箱、冷柜等产品的生产要求。     

玉米秸秆碎粉填充聚氨酯泡沫隔热塑料的研究及应用

采用玉米秸秆碎粉填充聚氨酯(PUR)泡沫塑料,研究了玉米秸秆碎粉的含量、粒径对PUR泡沫塑料的密度和压缩强度的影响,并对其导热性能进行了研究。结果表明,玉米秸秆碎粉填充PUR泡沫板的性能与未填充PUR泡沫板的性能相当,但成本相对较低;玉米秸秆碎粉填充PUR泡沫板可用作渠道防渗保温材料。     

慢回弹POP的合成及其在泡沫中应用

采用自制高效分散剂和选用不同引发剂合成慢回弹聚合物多元醇(POP),获得了固体质量分数24%的慢回弹POP。考察了分散剂的用量和不同引发剂及用量等因素的影响,并以该慢回弹POP和软泡聚醚制备慢回弹泡沫,检测其性能。结果表明,使用慢回弹POP可以明显改善泡沫开孔性并适当提高慢回弹泡沫的力学性能。     

起泡剂的起泡性能及使用浓度优选研究

起泡剂的起始发泡体积和泡沫稳定性是决定起泡剂起泡性能的两个重要因素,也是实际应用当中筛选起泡剂的重要指标.采用Ross-Miles法对13种不同类型起泡剂在常温下的起泡性能进行了评价.结果表明：不同类型起泡剂的起始发泡体积和泡沫稳定性具有显著的不同.不同起泡剂的起始发泡体积随浓度的增加而增大.当起泡剂浓度增加到0.5％时,起始发泡体积趋于稳定,由此确定起泡剂的最佳使用浓度为0.5％.     

A Comprehensive Comparison on Foam Behavior in the Presence of Light Oil and Heavy Oil

Crude oil properties significantly affect foam behavior that is important to foam application in enhanced oil recovery. This study focused on the comparison on foam behavior in the presence of light oil and heavy oil. Foamability and foam stability, the bubble size, and the film thickness as well as the configuration of oil drops were fully investigated. Final results indicated that both the heavy oil and light oil increased the foamability of sodium dodecyl sulfate but decreased that of the amphoteric surfactant imidazoline. The positive effect of both light oil and heavy oil on foam stability was reconfirmed. However, heavy oil was more favorable to foam stability. The light oil may shorten the foam half‐life but prolong the foam drainage half‐life. The heavy oil was more effective in reducing the foam size and increasing the foam uniformity compared with light oil. According to the micrograph of foam, light oil was emulsified into quite small oil droplets, filling the plateau borders and lamellas. The heavy oil, in the form of far larger oil droplets, was mainly distributed in plateau borders only. The larger oil droplets resulted in the more stable foam, which was verified. Moreover, light oil (oil B) performed well in thickening the foam film, as did the heavy oil (oil A). But for the lightest oil (oil C), a thinning effect on the film was detected.