氯乙烯-丙烯酸丁酯共聚树脂的工业化生产

在7m3聚合釜中采用悬浮聚合工艺工业化生产了氯乙烯-丙烯酸丁酯共聚树脂,在小试配方基础上调整了分散剂的配比和用量,采用在线实时示踪剂色谱联动控制法控制丙烯酸丁酯的加入速度,并采用了聚合中途注水工艺及改进的防粘釜工艺。工业化产品符合企业标准要求,可在PVC型材生产中替代ACR使用。     

氯乙烯-丙烯酸丁酯悬浮共聚树脂的研制

介绍了采用悬浮法研制氯乙烯-丙烯酸丁酯悬浮共聚树脂。考察了共聚配方、丙烯酸丁酯的加入方式及用量、分散剂种类及用量、聚合温度对共聚树脂的影响。     

偏氯乙烯-氯乙烯悬浮共聚树脂的加工性能研究

研究了偏氯乙烯(VDC)-氯乙烯(VC)悬浮共聚树脂的加工流变性和热稳定性。结果表明：增加共聚树脂中VC单元的含量，可改善树脂的流变性能，而对热稳定性几乎无影响；提高树脂的相对分子质量导致树脂流变性能降低；环氧大豆油(ESO)、乙酰基柠檬酸三丁酯(ATBC)助剂能改善树脂的加工流变性，其中ESO兼有热稳定剂作用。该共聚树脂的流变特性与日本树脂相近。     

偏二氯乙烯-氯乙烯共聚树脂加工性能的改进

针对聚偏二氯乙烯-氯乙烯(PVDC-VC)共聚树脂加工性能较差的特点,分析了共聚物的组成、相对分子质量及其分布、颗粒结构和增塑剂等因素对加工性能的影响,提出了改进其加工性能的化学和物理方法。认为应缩短PVDC聚合反应的时间,提高生产效率、降低成本,继续提高加工过程的热稳定性和制成品的韧性,以提高竞争力。     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的研制

采用悬浮共聚的方法研制了偏氯乙烯/丙烯酸甲酯（VDC/MA）共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度对VDC/MA共聚树脂的影响。结果表明,当VDC/MA=（92-96）/（8-4）、采用分散剂B（用量0.13%)、搅拌速度300-400r/min,并根据聚合温度调节分子量大小,制得的VDC/MA共聚树脂其膜光泽好、透时度高,热稳定性好。     

氯乙烯-丙烯酸酯共聚树脂的配合与加工

从PVC加工的角度出发,论述了氯乙烯-丙烯酸酯共聚树脂的特性、应用现状以及其与助剂的配合和加工技术。     

氯乙烯-醋酸乙烯共聚树脂加工应用

介绍了氯乙烯－醋酸乙烯共聚树脂的特性及其加工应用。     

氯乙烯-醋酸乙烯酯共聚糊树脂的开发

介绍了国内外氯乙烯一醋酸乙烯酯共聚糊树脂的基本理论、生产状况、产品特性及工艺技术，并详细介绍了沈阳化工股份有限公司的氯醋糊树脂开发的进程、工艺及产品的质量指标。     

偏二氯乙烯-氯乙烯共聚树脂的阻隔性

介绍了聚偏二氯乙烯-氯乙烯（VDC—VC）共聚树脂的阻隔特性及原理,分析了聚合过程、添加剂配方、成型加工工艺等对PVDC阻隔性能的影响。认为采用综合改进措施可以获得阻隔性能优异的PVDC制品。PVDC共聚树脂的未来发展将以多层共挤树脂为方向。     

偏氯乙烯－氯乙烯悬浮共聚树脂的研制研究

采胳悬浮共聚的方法研制了偏氯乙烯/氯乙烯（VCD/VC）共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度等对VDC/VC共聚树脂的影响。     

氯乙烯-丙烯酸丁酯-甲基丙烯酸甲酯三元共聚物的研究

讨论了氯乙烯 丙烯酸丁酯 甲基丙烯酸甲酯三元共聚物 3种共聚单体的投料比、反应温度、引发剂用量对共聚物树脂性能的影响。所得共聚树脂加工成片后 ,测量其各种物理性能 ,结果显示出低温韧性和抗冲击性等有了明显提高。     

氯乙烯/丙烯酸酯二元及多元共聚物的研究进展

介绍了氯乙烯/丙烯酸酯多元共聚物、聚氯乙烯树脂/丙烯酸酯/顺丁烯二酰亚胺接枝共聚物、聚氯乙烯树脂/N-取代马来酸胺/丙烯酸酯接枝共聚树脂、氯乙烯/乙酸乙烯/丙烯酸羟丙酯共聚物、氯乙烯/乙酸乙烯/丙烯酸丁酯共聚乳液、聚丙烯酸酯-氯乙烯接枝共聚物、氯乙烯/乙烯/丙烯酸羟乙酯共聚涂料树脂、氯乙烯/丙烯酸甲酯共聚乳液的特点、生产工艺及其性能和用途.     

氯乙烯-丙烯酸酯共聚树脂生产技术进展

介绍了氯乙烯-丙烯酸酯共聚树脂的主要品种、应用领域及生产方法,并提出了发展建议。     

氯醋共聚树脂生产环境空间中酯类物质含量的精密分析

通过改变气相色谱分析条件,提高了氯乙烯-醋酸乙烯酯共聚树脂生产环境空间中醋酸乙烯酯、丙烯酸丁酯、丙烯酸异辛酯分析结果的精密度和分析速度,对安全生产意义重大。     

Semicontinuous heterophase copolymerization of vinyl acetate and butyl acrylate

Vinyl acetate (VAc) and butyl acrylate (BuA) were copolymerized in heterophase by a semicontinuous process (unseeded) and compared with the seeded semicontinuous microemulsion polymerization of the same monomers. A mixture of sodium dodecyl sulfate (SDS) and poly(ethylene oxide) dodecyl ether (Brij‐35®) were used as surfactants. The effects of monomer addition rate (R_a) and surfactants concentrations (4 or 1 wt % with respect to the initial mixture of reaction) on polymer and latex properties were studied. High copolymer content latexes (24–36 wt %) with average particle diameters (D_p) from 38 to 55 nm and relatively narrow particle size distributions, high polymerization rates, weight ratios of polymer to surfactant (P/S) from 13.3 to 32.8 were obtained. The number‐average molecular weights (M_n) were between 96,000 and 188,000 g/mol. Homogeneous copolymer compositions were obtained throughout the reaction for both, seeded and unseeded processes, which is not possible by the usual batch microemulsion process. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Damping of vinyl acetate–n‐butyl acrylate copolymers

A photopolymerization process at room temperature was devised to copolymerize vinyl acetate (VAc) and n‐butyl acrylate (BA) mainly to prepare rubber‐like damping sheet bearing pressure‐sensitive adhesive property in this study. The investigations using both the differential scanning calorimeter and rheometric dynamic analysis show the existence of two glass transition temperatures for each copolymer. The scanning electron microscopic pictures reveal that the degree of microphase separation increases with increasing annealing time at 70°C. It was suggested that the rubbery domain (formed by the PBA blocks) disperses in the glassy domain (constituted by the PVAc blocks), making an effective damping entity. Excellent damping was observed for the copolymer samples, with the tanδ peak values as high as 1.76–1.80 at a certain temperature range and with tanδ> 0.3 at quite wide temperature ranges. In addition, the copolymers containing more VAc tend to have the higher damping. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 1396–1403, 2004