阳涂感光胶含酚废水处理

阳涂感光胶含酚废水处理１前言阳涂感光胶是由感光性树脂、酚醛树脂、染料及溶剂组成的高粘度液体。其中制酚醛树脂的主要原料是混合甲酚，在树脂合成过程中有含酚废水产生，其主要污染成分是混合甲酚，废水静置后可分层，上层为水层，含酚２２２８ｍｇ／Ｌ；下层为酚层，...     

用废旧电路板热解油制备酚醛树脂

在碳酸钙存在下,采用热解技术将废旧电路板中的树脂转化为富含酚的热解油,然后直接加入甲醛溶液反应制备热解油型酚醛树脂,实现了废旧电路板中树脂的再生,酚醛树脂的性能结构类似于氨催化的酚醛树脂。实验结果表明：在n（甲醛）：n（热解油）为1．8～2．1的条件下,无需外加催化剂,在60,80,90℃下分别反应30min制备的热解油型酚醛树脂的性能最佳,且可满足GB／T14732—93《木材工业胶黏剂用脲醛、酚醛、三氧氰胺甲醛树脂》中层压材料用酚醛树脂产品的相关标准。     

利用高低浓度含酚废水制油漆

生产酚醛树脂时产生的含酚、醛废水,分为高浓度和低浓度两级。高浓度含酚量约50%,低浓度含酚量约7%,含醛量约3%。根据酚醛催化缩合原理,高浓度含酚废水,补加甲醛后缩合生产油溶性酚醛树脂220-1;低浓度含酚废水先经碱性催化缩合生成醇溶性酚醛树脂,再改性成为油溶性酚醛树脂220-2。220-1和220-2用于生产酚醛漆料和配制酚醛色漆。     

废纸苯酚液化物合成热固型酚醛树脂

为了提高废纸的附加值,利用废纸苯酚液化物与甲醛在碱性环境中反应,进行热固型酚醛树脂合成实验。通过正交实验确定最优化的树脂化合成工艺为:n(甲醛)∶n(废纸液化物)=2.1,n(氢氧化钠)∶n(废纸液化物)=0.5,合成温度74℃,合成时间3.0h。在此工艺条件下制备的酚醛树脂压制的胶合板达到GB/T9846—2004《人造板及饰面人造板理化性能试验方法》中Ⅰ类胶合板的强度要求。     

木材胶粘剂生产中的污染及防治

阐述了木材胶粘剂－脲醛树脂胶粘剂（ＵＦ）,密胺甲醛树脂胶粘剂（ＭＦ）,酚醛树脂胶粘剂（ＰＦ）生产过程中产生的废气,釜垢及碱洗废液的污染,提出了从工艺上改善排放条件及治理的方法,同时提出了控制产品中游离甲醛的方法。     

含酚废水的综合利用及处理

我厂是生产酚醛树脂、酚醛塑料的老厂,每年排放含酚废水约1500吨,废水中酚含量为30000—35000ppm,甲醛含量2.5%左右,pH=1,该废水排入环境会造成严重污染。1981年8月我厂建成含酚废水处理车间,采用缩聚反应回收酚醛树脂及加脲酸性(加尿素和盐酸)反应二步法处理工艺进行了试运转。处理后,废水挥发酚含量低于0.5ppm,达到国家排放标准。今将处理的两步工艺分述如下:     

国内简讯

含酚废水处理新方法南化公司防腐材料厂开发了一种处理高浓度含酚废水新技术。该厂在生产酚醛树脂过程中,排出的废水含酚量高达30g/L,采用缩聚-树脂吸附法处理后,出水的酚含量可达石油化工污水排放标准。具体的处理方法是,将含酚废水(30g/L)、甲醛、催化剂(NaOH浓液)按一定比例加入反应釜内,搅拌加热至92℃左右,维持微沸一小时(以不出现釜内气体冷凝液回流为好),然后冷却至65℃以下,卸出物料并静置于废水槽内,待明显分层后,回收下层的酚醛树脂再用。将上层废水吸入酸化槽内,用硫     

废弃线路板热解油合成改性酚醛树脂

以废弃线路板热解油为原料,采用碱溶—中和—萃取工艺提取其中以苯酚为主的粗酚,并合成改性酚醛树脂。合成硼酸改性酚醛树脂的优化工艺条件为n(粗酚)∶n(外加苯酚)=2∶3,n(粗酚+外加苯酚)∶n(甲醛)∶n(NaOH)∶n(硼酸)=1∶1.5∶0.15∶0.17;合成有机硅改性酚醛树脂的优化工艺条件为n(粗酚)∶n(外加苯酚)=2∶3,n(粗酚+外加苯酚)∶n(甲醛)∶n(NaOH)∶n(正硅酸乙酯)=1∶1.3∶0.1∶0.1。所合成的硼酸改性和有机硅改性酚醛树脂的主要性能指标均满足YB/T4131—2005《耐火材料用酚醛树脂》中牌号为PFn-5301的热固性液体树脂性能的要求。     

用NKA树脂处理含酚废水

天津卫津化工厂用NKA树脂处理含酚废水,进行了百公斤级的中试,取得了可喜的成果。     

酚醛树脂废水的回收预处理

酚醛树脂生产废水含酚量和含醛量都较高,采用酸性缩聚法或碱性缩聚法处理,能大大降低酚和醛的含量,而且能回收到一定量的树脂.     

防腐漆涂装含锌废水中锌粉的回收与利用

从水性环氧富锌涂料工业涂装废水中回收废锌粉,通过加热二甲基亚砜来溶解包覆于废锌粉表面的环氧树脂漆膜,得到回收锌粉,并将其再利用制防腐漆。在沉降时间12 h、热处理温度110 ℃、热处理时间60 min的条件下,废锌粉表面上的环氧树脂被去除,可直接以金属锌粉的形态加以回收利用,回收锌粉达到GB/T 6890—2012《锌粉》中的二级标准。使用后的溶剂经旋转蒸发后可再次使用,对锌粉的回收效果无影响。回收锌粉制备的防腐漆,其防腐蚀性能良好,可比市售锌粉。     

Adhesion Properties of Adhesive Prepared from Waste Polystyrene

Solid and soft forms of waste polystyrene have been treated with coumarone–indene resin and benzene to produce a new adhesive. The adhesive is prepared from various compositions of polystyrene (13–38 wt%), coumarone-indene resin (5–7%) and benzene (57–80%). Viscosity, peel strength and tensile shear strength of the adhesive is determined by a HAAKE Rotary Viscometer, Lloyd Adhesion Tester and Instron machine, respectively. Rolling ball technique was used to measure the tackiness of the adhesive. Results show that the adhesion property increases with increase in polystyrene composition and coating thickness. This observation is attributed to the increasing wettability of adhesive on the substrate.     

Effect of Hybrid Tackifiers on Adhesion Properties of Epoxidized Natural Rubber-Based Pressure-Sensitive Adhesives

Viscosity, peel and shear strength of epoxidized natural rubber (ENR)-based pressure-sensitive adhesive was studied by using hybrid tackifiers consisting of a mixture of coumarone-indene resin and petro resin. The coumarone-indene resin concentration was fixed at 40 parts per hundred parts of rubber (phr). The concentration of petro resin, however, was varied from 20 to 80 phr. Toluene and polyethylene terephthalate (PET) film were used as the solvent and coating substrate respectively throughout the experiment. Viscosity of adhesive was determined by a HAAKE Rotary Viscometer whereas peel and shear strength was measured by a Lloyd Adhesion Tester. Results show that viscosity and shear strength decreases with increasing petro resin concentration. However, peel strength exhibits a maximum value at 40 phr petro resin, an observation which is attributed to maximum wettability and compatibility of adhesive on the substrate. ENR 25-based adhesive exhibits higher viscosity and peel strength but lower shear strength compared to the ENR 50 adhesive system.     

Properties of Distillers Grains Composites: A Preliminary Investigation

Interest in renewable biofuel sources has intensified in recent years, leading to greatly increased production of ethanol and its primary coproduct, Distillers Dried Grain with Solubles (DDGS). Consequently, the development of new outlets for DDGS has become crucial to maintaining the economic viability of the industry. In light of these developments, this preliminary study aimed to determine the suitability of DDGS for use as a biofiller in low-cost composites that could be produced by rapid prototyping applications. The effects of DDGS content, particle size, curing temperature, and compression on resulting properties, such as flexural strength, modulus of elasticity, water activity, and color were evaluated for two adhesive bases. The composites formed with phenolic resin glue were found to be greatly superior to glue in terms of mechanical strength and durability: resin-based composites had maximum fiber stresses of 150–380 kPa, while glue composites had values between 6 kPa and 35 kPa; additionally, glue composites experienced relatively rapid microbial growth. In the resin composites, both decreased particle size and increased compression resulted in increased mechanical strength, while a moderate DDGS content was found to increase flexural strength but decrease Young’s modulus. These results indicate that DDGS has the potential to be used in resin glue-based composites to both improve flexural strength and improve potential biodegradability.     

高浓度酚醛树脂生产废水的预处理

采用二次缩合反应预处理高浓度酚醛树脂生产废水。一次反应的最佳工艺条件为：甲醛加入量0.010 0 mL/mL,Ba（OH）2加入量0.005 g/mL,反应时间3 h,反应温度85 ℃。最佳工艺条件下的一次反应COD去除率为 52.9%。二次反应中,当反应温度为80 ℃、反应时间为3 h、尿素加入量为3 g/L时,二次反应COD去除率最高,为31.5%。COD=85 000 mg/L、ρ（挥发酚）= 12 000 mg/L、ρ（甲醛）=6 740 mg/L的废水经两次缩合反应处理后,出水中COD=27 400 mg/L,COD的总去除率为67.8%;ρ（挥发酚）=2 400 mg/L,挥发酚的总去除率达80.0%;ρ（甲醛）= 980 mg/L,甲醛的总去除率达84.9%。处理1 t废水还可回收酚醛树脂6.75 kg。     

微电解-UASB-接触氧化处理酚醛树脂废水

采用微电解一上流式厌氧污泥床（Upflow Anaerobic Sludge Bed,简称UASB）-接触氧化工艺处理酚醛树脂生产废水（简称废水）。实验结果表明：采用微电解法对废水进行预处理,不仅去除了约36％COD,还大幅度提高了废水的可生化性;微电解出水经UASB厌氧生物处理后,COD去除率达80％;水解酸化COD去除率约为30％;最后经二级接触氧化处理,出水COD为100mg／L以下,达到GB8978--1996《污水综合排放标准》中化工类废水的二级排放标准。     

聚氯乙烯生产中副产高沸物的综合利用

介绍了以ＰＶＣ生产中副产的高沸物精制后作溶剂,降解后的废聚苯乙烯泡沫塑料的作主料,制造塑化防腐漆的工艺流程,产品性能及经济效益。