废旧电路板热解油合成酚醛树脂胶粘剂的研究

研究了废旧电路板热解油代替苯酚合成酚醛树脂胶粘剂,采用L(93)4正交设计安排实验,重点考察了甲醛加入量、催化剂加入量,第一阶段反应温度和第二阶段反应温度四个因素对热解油酚醛树脂粘胶剂的胶合强度影响。依据正交试验结果和兼顾粘胶剂的整体性能,当热解油的加入量为35g时,合成酚醛树脂胶粘剂最优工艺为37wt%的甲醛加入量为47g,40wt%的氢氧化钠液加入量为7.8g,第一阶段温度为60℃,第二阶段温度为90℃。制得的酚醛树脂胶固含量,粘度和pH值适中,游离甲醛含量低于0.3wt%,符合GB/T14732-2006中规定的层压材料用酚醛树脂产品的相关标准和要求,并且其胶合强度符合GB/T9846-2004中由桦木制成的Ⅰ类胶合板胶合强度指标值(≥0.8MPa)。同时还对热解油和合成产物进行了高效液相色谱(HPLC),红外光谱分析(FTIR)分析,探求了反应变化的机理。由于废旧电路板热解油代替苯酚合成酚醛树脂胶粘剂降低了胶粘剂的生产成本,其所制得的胶粘剂有良好的应用前景。     

新型弱碱性阴离子交换树脂对Cr(Ⅵ)的吸附性能

用氯乙酰化聚苯乙烯树脂(PS-Acyl-Cl)代替传统的氯甲基化聚苯乙烯树脂(PS-CH2-Cl),通过其与二乙胺(DEA)的胺化反应得到一种新型弱碱性阴离子交换树脂(PS-Acyl-DEA)。研究了该树脂对C(rⅥ)的静态吸附性能,以期处理含铬废水及铬的富集回收提供理论和实验依据。结果表明,该树脂对C(rⅥ)的吸附量随pH的降低而增加;吸附过程在实验浓度范围内符合Langmuir和Freundlich方程,且最大吸附量达263mg/g,大于文献报道。动力学和热力学研究表明,吸附过程为液膜扩散控制,自发且放热过程。     

2,4-二硝基酚在离子交换树脂上吸附与微波脱附

研究了717强碱阴离子交换树脂对水中2,4-二硝基苯酚(2,4-DNP)的吸附解吸性能,探讨了吸附的热力学和动力学特性及其微波脱附性能。结果表明:在pH=4～11时,该树脂对2,4-DNP有较强的吸附能力。Freundlich吸附等温方程能很好地描述吸附平衡数据,吸附过程为放热、熵减的自发过程。吸附动力学符合Lagergren二级速率方程,颗粒内扩散是吸附速率的主要控制步骤,可采用HSDM模型描述。以1mol/L HNO3+C2H5OH溶液作为脱附剂,采用微波辅助脱附再生,微波辐照累计5min时,酚脱附率可达90%以上。     

多功能富氧净水器在养殖领域的研究与应用

多功能富氧净水器的研究,采用聚丙烯微孔滤膜、复合活性炭纤维、酸性洗涤纤维及复合炭粒作为过滤吸附材料,并采用三碘树脂杀菌剂和载银活性炭复合杀菌剂进行灭菌,应用"综合过滤渗透法"的机理,将净化、矿化、灭菌、增氧等有机结合并进行反复的研究和试验,有效去除了水中微生物、污染物,降低化学需氧量和水的硬度,达到净化水质,增加水中溶解氧等预期效果,成功的应用在水产养殖等领域。     

盐析-树脂吸附法处理对羟基苯海因生产废水

采用盐析-树脂NDA-99双柱串联吸附组合工艺处理对羟基苯海因生产过程中排放的高浓度含酚废水。通过实验确定了最佳盐析参数及树脂吸附最佳工艺参数。实验结果表明:在最佳工艺条件下对该废水进行处理,挥发酚浓度降至10mg/L以下,去除率接近100%;COD降至400mg/L以下,去除率达90%以上。该工艺简单实用,可望实现工业化。     

废弃印刷线路板中环氧树脂的资源化技术

印刷线路板是电子工业的基础,伴随着电子废弃物的快速增长,废弃印刷线路板的回收已经成为迫切需要研究的领域。对废弃印刷线路板中环氧树脂常用的资源化方法、物理法、热解法、超临界法及化学溶剂法等进行了介绍,并比较了几种方法的优缺点。     

Thiolsulfonate functionalized polystyrene resin： Preparation and application in the isolation and identification of electrophilic mutagens

A new approach for isolation and identification of elecrtophilic mutagens from complex matrix was developed.Thiosulfonic anion was immobilized onto polystyrene beads and used as separation media.Potassium polystyryl-thiosulfonate,prepared from polystyryl- sulfonyl chloride and KHS,was observed to selectively react with model electrophilic mutagens such as alkyl halides,α-chloroketones andα-chloroesters to produce polystyryl-thiosulfonic esters.After separation from other nonreactive organic compounds,the beads then reacted with ethanethiol to produce unsymmetrical ethyl disulfides which are easily detected by GC/MS.For one mutagenic compound,only one unsymmetrical disulfide was found to contain its structure part.Thus,the structure of the parent mutagens could be deduced from that of the unsymmetrical disulfides.The degree of functionaiization of the potassium polystyryl-thiosulfonate resin was 1.11 mmol/g.Its reactivity was discussed and its recycling method was reported here.     

Removal of bentazone from micro-polluted water using MIEX resin: Kinetics, equilibrium, and mechanism

The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years. We conducted a detailed investigation using MIEX resin to eliminate bentazone from waters. Batch experiments were carried out to evaluate the e ect of process parameters, such as retention time, resin amount, and initial pesticide concentration, on removal e ciency of bentazone. Results showed the sorption process was fast and bentazone could be e ciently removed in 30 minutes. The kinetic process of bentazone sorption on MIEX resin was well described by pseudo second-order model and intraparticle di usion was the rate controlling step. The MIEX resin possessed the highest sorption capacity of 0.2656 mmol/mL for bentazone according to Langmuir fitting. Bentazone is a hydrophobic ionizable organic compound, and both ionic charge and hydrophobic aromatic structure governed the sorption characteristics on MIEX resin. The di erent removal e ciencies of ionic and non-ionic pesticides, combined with the charge balance equations of bentazone, SO4 2??, NO3?? and Cl??, indicated that removal of bentazone using MIEX resin occurred primarily via ion exchange.     

嗪草酮农药生产环合废水物化处理工艺研究

采用絮凝-树脂吸附组合工艺对嗪草酮农药生产环合废水进行物化预处理.实验确定的最佳工艺条件为:(1)絮凝-絮凝剂为10%硫酸铝溶液(W/W),投加量为8%(V/V),废水pH为6～9,快速搅拌1 min(150～180 r/min),慢速搅拌15 min(80～100 r/min);(2)树脂吸附-双柱串联吸附:上柱液p...     

新型低表面能涂层制备及紫外光照射研究

以自制氟硅聚合物为芯材,脲醛树脂为壁材,通过原位聚合法制备一种微胶囊.将其添加到涂料中制备出长效低表面能涂层.涂层的表面能低,与水接触角可达120°.涂层经紫外线照射400h后,其接触角下降不明显,表面能几乎不发生变化.