PET瓶回收再生技术进展

对废PET瓶进行回收再生,不但可以减少环境污染,而且还可以节省资源。文章介绍了废PET瓶常用的物理回收方法和化学回收方法,筒述了回收再生过程中PET瓶的分选与分离、清洗、切片破碎技术,还对阐收PET瓶片的直接利用技术、无熔造粒技术、反应挤出增黏以及PET高分子合金制造技术等进展进行了概述,指出了废PET瓶回收再生领域的发展方向。     

PET的再生利用技术

综述了近年国内外在废旧PET瓶回收利用方面的最新研究进展，总结了废旧PET瓶回收利用的主要方法和其污染物的问题，分析了今后我国废旧PET瓶回收利用技术的发展趋势和应采取的措施，指出了废旧PET回收利用的重要性。     

PET回收料再利用项目

PET瓶的回收是一个具有较好发展前景的产业。目前世界上大约有70％左右的回收PET瓶再生料被制成纤维。日本PET的生产商帝人集团推出的“瓶-瓶”回收工艺是20世纪90年代开始出现的新的回收技术，“瓶-瓶”回收技术能实现循环经济的闭环回收再生。     

PET回收料再利用项目

PET瓶的回收是一个具有较好发展前景的产业。目前世界上大约有70%左右的回收PET瓶再生料被制成纤维。日本PET的生产商帝人集团推出的"瓶-瓶"回收工艺是20世纪90年代开始出现的新的PET回收技术,"瓶-瓶"回收技术能实现循环经济的闭环回收再生。目前,国内PET回收瓶主要用于纺丝,也有将少量的废瓶片与新料混合造粒吹瓶,而由废瓶直接吹瓶的技术在国内一直处于空白。由北京崇高纳米科技有限公司开发生产的纳米马-NPET母粒及其应用技术可以填补此项空白。该技术可提高PET回收料的熔体强度,使回收PET树脂在熔融加工中工艺顺畅(不出现流淌…     

无卤阻燃增强PTT/回收PET瓶片复合材料的研究

以PTT,回收PET瓶片为基材树脂,通过添加玻纤、阻燃剂,增韧剂等制备出无卤阻燃增强PTT/回收PET瓶片复合材料,研究了阻燃剂,增韧剂以及回收PET瓶片对复合材料的性能的影响。结果表明,在复合材料中,随着回收PET瓶片含量的增加,复合材料的拉伸强度先增加,当质量分数达到20%后略有降低,复合材料的缺口冲击强度则随着回收PET瓶片含量的增加逐步降低;无卤红磷阻燃剂质量分数为15%,复合材料的阻燃性能达到UL94-V0,复合材料具有良好的成型加工性和综合性能。     

废PET瓶回收再生技术及应用进展

废聚酯(PET)瓶的回收再生,不但可以减少环境污染,而且还可以节约资源。本文介绍了废PET瓶常用的物理、化学及物理-化学回收技术,以及废PET瓶回收再生的应用领域。     

材料回收热：多家新厂尝试新的回收技术

由于纯树脂价格昂贵,许多商家致力于塑料回收工作。从“瓶子-瓶子”的PET瓶回收再利用技术,到农用地膜．地毯和汽车粉碎残渣等新的回收项目,塑料回收再利用技术发展得如火如荼.     

用回收料生产高强度塑料枕木

介绍了研究和试验用回收塑料制造复合型铁路枕木的技术。回收塑料主要是牛奶瓶和洗涤剂瓶此类的低融流的高密度聚乙烯 (HDPE)。该研究的直接成果是发明了一种特殊的方法 ,可使短的、长度不一的玻璃纤维在模具内沿着物料流向的轴向高度同向。本文还介绍了该研究的详细内容     

再生聚酯行业的发展与建议

分析了中国再生聚酯原料的供需状况、再生聚酯行业下游情况及有关政策;比较了再生聚酯物理回收和化学回收方法的优缺点,解释了"纤维到纤维"、"瓶到瓶"再生技术;介绍了Wellman、Mon-terfibers、宁波大发、江苏长隆等国内外再生聚酯生产公司概况,指出中国再生聚酯行业存在的主要问题,并提出建议。     

废PET瓶回收利用及其再生料工程塑料化改性研究进展

综述了PET瓶的化学、物理回收方法和将PET工程塑料化的几种改性方法,分析了PET工程塑料的产业化现状,展望了该行业的发展前景。     

Recycled polyester nanofiber as a reservoir for essential oil release

The importance of creating sustainable alternatives for products that can be easily recyclable, such as, poly (ethylene terephthalate) (PET), is not new, being textile fibers the product of greatest interest. The objective of this work is to propose a recycling alternative for PET bottles for fiber production as a reservoir of essential oils for aromatherapy applications. The fibers were obtained via coaxial and dual-jet electrospinning techniques. The material used in the impregnation and release of peppermint oil was PET originating from disposable bottles. The release of oil from the electrospun fibers was quantified by UV–vis spectroscopy. For the fibers produced by dual-jet electrospinning the cumulative release of peppermint reached around 70% after 30 days. The sample obtained by coaxial electrospinning had a core-shell structure and the amount of oil released was 33% after 30 days. In this investigation, a less aggressive process was introduced, making the electrospinning of PET a viable technique for essential oil impregnation. Dual-jet as well as coaxial electrospinning showed slower release than values reported in the literature. Thus, a procedure with more favorable working conditions was developed, making the process more feasible and serving as an alternative for recycling PET bottles to produce functional textiles.     

PET瓶回收应用进展

介绍了国内外废旧PET瓶通过物理或化学回收方法制取再生薄片、粒料、纤维、片材、泡沫塑料、复合材料、涂料等的应用进展；另外，对于闭环循环的PET“瓶-瓶”回收工艺技术进行了专门介绍。     

Aminolytic depolymerization of poly(ethylene terephthalate) waste in a microwave reactor

The aminolytic depolymerization of poly(ethylene terephthalate) (PET) taken from waste soft‐drink bottles, under microwave irradiation, is proposed as a recycling method with possible substantial energy savings. The reaction was carried out with ethanolamine and without the use of any other catalyst in a sealed microwave reactor in which the pressure and temperature were controlled and recorded. Experiments under constant temperature or microwave power were carried out for several time periods. The main product, bis(2‐hydroxyethyl) terephthalamide, was identified from Fourier transform infrared (FTIR) spectra and DSC measurements. It was found that PET depolymerization is favoured by increasing temperature, time and microwave power. The average molecular weight of the PET residues, determined using viscosity measurements, was found to decrease with the percentage of PET degradation, indicating a random chain scission mechanism to some extent. From a simple kinetic model, the activation energy of the reaction was evaluated. Complete depolymerization was found to occur in less than 5 min when the irradiation power applied was 100 W or the temperature was 260 °C. These results support the use of microwave‐assisted aminolytic degradation as a very beneficial method for the recycling of PET wastes. Copyright © 2010 Society of Chemical Industry     

A Rapid,Economical, and Eco-Friendly Method to Recycle Terephthalic Acid from Waste Poly (Ethylene Terphthalate) Bottles

A method has been proposed to rapidly degrade waste PET (polyethylene terphthalate) bottles and recover terephthalic acid (TPA) in good yield. The method involves fusion of PET bottle chips with caustic soda in a china-clay crucible placed on the silicon carbide (SiC) slab by exposure to microwaves in a domestic oven. The PET waste was converted to water-soluble sodium salt of TPA in just 4 minutes. Afterwards, the solution was acidified with HCl to recover TPA in high yield. The method can be used to design environmentally benign and fast industrial prototypes to recycle terephthalic acid from waste PET bottles.     

废旧PET的化学回收方法研究进展

PET综合性能良好,应用广泛,但难以生物降解,随着排入自然界的废旧PET日益增多,对其进行回收利用已迫在眉睫。回收方法包括物理方法、化学方法、物理化学方法等,其中,化学回收方法将PET解聚成单体或低聚体,是实现废旧PET循环利用最有前途的途径之一,包括醇解法、水解法等。本文重点对废旧PET的化学回收方法研究现状及新进展进行了综述,旨在为PET的工业回收利用提供参考。     

基于传递函数估计的闭环PID参数自整定

本文基于对被控对象传递函数的估计,提出了一种闭环PID参数整定方法。通过实时采集被控对象的输入输出数据,采用平均相关系数法估计被控对象的传递函数,然后采用时域受限二次型目标函数寻优PID参数。最后用工业应用实例,说明该方法的有效性。     

福州市废旧饮料瓶回收体系及静脉产业园建设方案初探

本文通过分析福州市废旧饮料瓶回收体系建设现状,剖析了现有回收体系存在的不足。初步提出福州市废旧饮料瓶回收体系和静脉产业园建设方案,并设计了废旧饮料瓶回收再利用的节水循环系统。     

聚酯瓶物理回收再生技术的新进展

概述了聚酯瓶物理回收再生过程中的分拣、破碎、清洗技术以及增链剂的应用技术,对在线检测技术、无熔造粒以及聚酯合金技术在PET回收中的应用进行了介绍。     

Recycling PET beverage bottles and improving properties

Recycling PET from bottles has been carried out by three different extrusion methods. Under optimized processing conditions, a virgin poly(ethylene terephthalate (PET), recycled PET and a mixture of virgin and recycled PET, with and without the modifier polypropylene functionalized with maleic anhydride [PP‐graft‐MA]), were processed. Different methods were used to characterize the processed products. The results showed that the intrinsic viscosity and molecular weight decreased as the blend ratio of recycled PET was increased. This was due to thermal exposure as well as shear degradation of recycled PET. Thermal cycles of the processes used for recycling PET and its blending specimens with virgin PET show the importance of the thermal treatment in the improvement of mechanical strength and increased crystallinity. Nevertheless, the properties of the functionalized blends were improved. This behaviour is attributed to a series of chemical and physico‐chemical interactions taking place between the two components. Copyright © 2004 Society of Chemical Industry     

聚对苯二甲酸乙二醇酯回收技术和标准现状

简要介绍了近几年来聚对苯二甲酸乙二醇酯（PET）的回收应用现状，以及国内外相关标准法规；重点综述了PET物理回收和化学回收技术的研究进展，并对不同回收技术的特点进行比较与分析，以期为今后PET相关回收研究提供参考。