PVC生产中聚合回收VCM精制技术的研究及工业应用

针对聚合回收VCM传统回收方式带水严重、回收单体易自聚、含助剂及高沸物多等难题,采用碱洗、除水、再精馏的处理办法,将其中的水分、助剂、高沸物去除,使得回收单体纯度达到新鲜单体的指标要求,显著改善PVC产品质量。     

有机硅-苯丙乳液的最低成膜温度

清华大学的杜奕等人以有机硅单体、丙烯酸丁酯、甲基丙烯酸、苯乙烯等为原料,采用半连续法制备了稳定的有机硅-苯丙乳液,研究了软硬单体配比和有机硅单体含量对共聚物玻璃化温度(Tg)及乳液最低成膜温度(TMF)的影响;并选用3种成膜助剂分别考察了成膜助剂的种类、用量对乳液TMF的     

WC-1水性树脂的制备和在木器上的应用(摘要)

<正> 水性树脂以水为分散介质,以丙烯酸酯类为单体加入少量的交联单体经乳液聚合,然后随着使用要求的不同,加入成膜助剂、增稠剂、消泡剂、防冻剂、流平剂等各种助剂而调制成木器底漆。     

三元共聚乳液制备可再湿性胶的研究

以醋酸乙烯酯为主单体 ,丙烯酸、马来酸二丁酯为改性单体 ,加入PVA、DBP等助剂制备可再湿性醋酸乙烯酯乳胶。主要讨论了单体配比、引发剂浓度、PVA用量、DBP用量等因素对产品性能的影响     

醇溶性纸塑复膜胶的研制

以乙醇为溶剂，以醋酸乙烯酯（VAC）、丙烯酸丁酯（BA）、丙烯酸（AA）、甲基丙烯酸（MAA）为主要共聚单体，配以适量的其它硬单体，低沸点混合溶剂和适量助剂，采用一次加料法合成了醇溶型复膜胶。观察分析了引发剂用量、共聚单体配比及助剂用量等因素对胶粘剂粘接性能和醇溶性能的影响。     

提高电石法PVC特种树脂产品质量的措施

从氯乙烯单体质量、化学助剂、生产过程控制3个方面对电石法PVC特种树脂的产品质量进行了探讨,并从提高电石法单体质量、针对不同类型的特种树脂选择相应的化学助剂、聚合投料及生产过程控制的改进等方面提出了提高特种树脂产品质量的应对措施。     

发展中的中国石油化学工业

甲基丙烯酸甲酯,英文缩写为MMA,分子为CH_2=C(CH_3)COOCH_3;无色流动液体,密度0.936g/cm~3,熔点-48.2℃,沸点100～10l℃;微溶于水,溶于乙醇和乙醚;易挥发,易聚合,也能与其他单体共聚.MMA又名有机玻璃单体,是聚合有机玻璃(PMMA)、合成甲基丙烯酸高级酯的原料,也可用作其他合成树脂、涂料的单体,还可广泛用于树脂改性、光学材料、纺织助剂、皮革助剂、建材、造纸助剂、粘合剂等方面.     

N-丙烯酰吗啉的合成

N-丙烯酰吗啉是合成树脂的优良助剂和改性剂，用于紫外线固化树脂的反应稀释剂，还是丙烯酸酯树脂和明胶的有效改性剂，以其为原料的多丙烯酰吗啉聚合产品应用于油田助剂、油墨助剂、造纸助剂和粘合剂等领域。是某些水处理领域替代有毒的丙烯酰胺单体及其聚合产品的最佳选择。     

甲基丙烯酸甲酯生产与消费

甲基丙烯酸甲酯(简称MMA)主要用于生产聚甲基丙烯酸甲酯(有机玻璃)；制备聚氯乙烯助剂ACR和用作腈纶生产的第二单体；与其他乙烯基单体共聚得到不同性质的产品，用作纸张上光剂、纺织印染助剂、皮革处理剂、润滑油添加剂、原油降凝剂，木材和软木材的浸润剂、电机线圈的浸透剂、绝缘灌注材料和塑料型乳液的增塑剂等。     

水性快干耐磨纳米复合道路标志涂料的研制

通过优选交联共聚单体和氨基硅烷偶联剂等功能单体,与丙烯酸类单体、苯乙烯共聚,采用核壳乳液聚合工艺制备了软壳硬核的核壳性乳液,然后与纳米二氧化硅、功能多胺聚合物、颜填料和助剂等复配,制得了性能优异的环保型路标志涂料,具有干燥速度快、强耐磨、耐水性和耐老化的特性。     

来自塑料包材的化妆品安全性隐患

塑料内常含有残留单体、添加剂、低聚体、加工助剂等化学物,在其与产品接触过程中可能发生迁移而污染产品,从而对人体健康产生潜在的危害。介绍了来自塑料包装材料的存在安全隐患的迁移物及其危害,讨论了迁移的理论基础以及迁移过程的预测模型。指出了对包装材料安全监管和深入研究的必要性、监管和进一步研究的重点方向,以及化妆品生产企业确定包装材料时应该关注的重点。     

Two‐component acrylic structural adhesive initiated by tributylborane for untreated PET adhesion

In order to improve the adhesion strength of acrylic adhesive to untreated poly(ethylene terephthalate) (PET) substrate, two‐component acrylic structural adhesives initiated by tributylborane were prepared. The effects of acrylic monomers, elastomers, decomplexers, and oligomers on the adhesion properties of two‐component acrylic structural adhesive were investigated in sequence. It is found that the shear strength on PET of adhesives toughened by acrylonitrile–butadiene–styrene copolymer and carboxyl‐terminated butadiene–acrylonitrile copolymer is higher than that of commercial adhesives Dp8010NS and Loctite 3030. A tailored oligomer was synthesized from hydroxyl propyl–terminated polydimethylsiloxane and 3‐isopropenyl‐α,α‐dimethylbenzyl isocyanate. It is also noticed that premature failure usually takes place in the lap shear test samples due to the brittleness of the acrylic adhesive, except in the sample of adhesive modified by tailored oligomer. Excellent adhesion to the PET substrate is achieved by this adhesive modified by tailored oligomer, with a lap shear strength above 11 MPa and T‐peel strength up to 5.34 N/mm. Additionally, the resulting adhesive is qualified for the structural bonding of PET materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46612.     

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。     

紫外光固化玻璃涂膜附着力的研究

研究了低聚物、活性稀释单体以及助剂对玻璃涂膜附着力的影响。实验发现加入一定量的三官能团酸酯或硅烷偶联剂可以显著提高紫外光固化玻璃涂膜对玻璃的附着力。     

紫外光固化涂料耐划伤性能的研究

本文通过选择不同的UV固化树脂、活性稀释剂、促进剂,制备了适合于薄膜基材使用的UV固化涂料。实验显示,涂料的各项性能如附着力、硬度、柔韧性和耐擦伤性等达到了使用要求。     

PET薄膜抗划伤涂层的研究

本文通过对不同官能度聚氨酯丙烯酸酯预聚物和活性稀释剂的研究,制备了适合于PET薄膜使用的UV固化抗划伤涂料。实验显示,涂料组分的双键密度（官能度）影响涂层的各项性能如附着力、硬度、柔韧性和耐擦伤性等。     

Oligomer production through glycolysis of poly(ethylene terephthalate): effects of temperature and water content on reaction extent

Using ethylene glycol (EG) and post‐consumer poly(ethylene terephthalate) (PET) bottles, monomers and oligomers were obtained through glycolysis catalyzed by zinc acetate. Three reaction temperatures (150, 160 and 170 °C) and water contents (0, 1.0 and 2.0% with respect to the volume of EG) were used as inputs; the extent of depolymerization as the analyzed response formed the basis for a factorial design experiment. The products obtained from PET glycolysis were analyzed using high‐performance liquid chromatography and Fourier transform infrared spectroscopy, and their morphology was evaluated using scanning electron microscopy. The results showed the presence of terephthalic acid, hydroxylated tetramers, bis(hydroxyethyl) terephthalate monomer and dimer, and also oligomers with various molecular weights, water being present in the reaction medium. Statistical analysis (95% confidence) indicated that temperature and water content were significant inputs for glycolysis of PET, with the temperature being much the more important factor. © 2016 Society of Chemical Industry     

Characterization of Radiation-Induced Thin Films of Urethane Oligomer

Forty different formulations were developed with urethane diacrylate (M1200) oligomers (containing an aliphatic backbone chain) in the presence of eight different functional monomer diluents additives and five co monomers (co additives). Thin films, prepared with these formulations under ultraviolet (UV) and electron beam (EB) radiations, were characterized. The theological properties were correlated with glass transition temperature (T _g) of the co monomer diluents. Results obtained with M1200 under UV and EB radiations are discussed and compared with those of aromatic urethane (M1100) films, previously reported.     

Methanolysis of Poly（ethylene terephthalate）in Supercritical Phase

1 INTRODUCTIONPoly(ethylene terephthalate), commonly known as PET polyester, is extensively used for making synthetic fibers and package containers. The volume of PET consumed is rising by year, and thus the chemical recycling and reuse of waste PET are drawing much attention for the preservation of resources and the protection of environment. Through chemical recycling, waste PET is depolymerized into its valuable monomers such as dimethyl terephthalate (DMT), bis (hydroxyethyl) ter…     

光固化涂料的应用和市场前景

光固化涂料主要由低聚物、单体、光引发剂及助剂组成。UV固化的主要反应历程是由辐射引起光引发剂分解,生成活性自由基引发单体以氐聚物聚合交联。针对光固化涂料的性能特点和光固原理,介绍了光固化涂料的应用领域,阐述了光固化涂料适合多种基材的涂装,研究了光固化涂料在汽车装饰上的应用,指出了光固化涂料的发展前景与潜力。