氯乙烯-醋酸乙烯酯共聚糊树脂的工业化生产

介绍了国内外氯乙烯-醋酸乙烯酯共聚糊树脂牌号和沈阳化工股份有限公司的氯乙烯-醋酸乙烯酯共聚糊树脂工业化生产技术、产品质量指标及"三废"治理与产品的应用情况。     

氯乙烯-醋酸乙烯酯共聚糊树脂中醋酸乙烯酯含量的测定

采用红外光谱法测定了氯乙烯-醋酸乙烯酯共聚糊树脂中醋酸乙烯酯的含量,并与热重法、化学分析法等分析方法进行了比较。指出氯乙烯-醋酸乙烯酯共聚糊树脂中醋酸乙烯酯含量的多种测定方法各有其特点,需要根据实际情况选用;红外光谱法快速、准确,可满足企业科研和生产所需。     

氯乙烯-醋酸乙烯酯共聚糊树脂次级粒子特性研究

讨论氯乙烯-醋酸乙烯酯共聚乳液后处理工艺与树脂次级粒子特性间的关系。根据氯醋糊树脂性能特点,调整喷雾干燥器进出口温度,研究干燥工艺条件与树脂次级粒子结构及树脂增塑糊粘度间的关系,乳胶固含量对树脂次级粒子及糊粘度的影响规律,确定合适干燥工艺及乳液含固量,降低树脂糊粘度。对优化条件下制备的氯醋糊树脂颗粒特性、流变性能进行分析和对比,获得良好结果。     

国内专利精选

正微悬浮聚合制备丙烯酸酯改性氯乙烯-醋酸乙烯酯共聚树脂:CN105985479A∥苑会林(北京化工大学),公开日期:2016-10-05公开了一种丙烯酸酯改性氯乙烯-醋酸乙烯酯共聚树脂的制备方法,属于高分子合成领域。制备工艺为:将氯乙烯、醋酸乙烯酯、引发剂、分散剂、乳化剂、链转移剂依次加入反应釜中搅拌并升温,再将丙烯酸酯单体分批连续地加入到反应釜中,在50~80℃和0.3~1.2 MPa条件下进行聚合反     

氯醋糊树脂的合成试验

通过氯乙烯与醋酸乙烯酯的共聚试验,研究了单体的投料配比、加料工艺、聚合转化率等对氯醋共聚糊树脂中醋酸乙烯酯含量以及树脂性能的影响规律,掌握了在10 L聚合釜中制备高醋酸乙烯酯含量氯醋糊树脂的聚合工艺。     

悬浮法氯乙烯-醋酸乙烯酯共聚树脂生产技术及进展

介绍了悬浮法氯乙烯-醋酸乙烯酯共聚树脂生产工艺技术,列举了国内氯乙烯-醋酸乙烯酯共聚树脂生产技术的新进展,并指出了其工艺技术发展动态。     

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。     

国内专利精选

正提高微悬浮聚氯乙烯糊树脂生产效率的方法:CN 105884945A∥李明(唐山三友氯碱有限责任公司),公开日期:2016-08-24公开了一种提高微悬浮聚氯乙烯糊树脂生产效率的方法,按如下步骤进行:将引发剂、乳化剂、助乳化剂、氯乙烯单体和脱盐水乳化后加入聚合釜,在40~60℃下反应,反应开     

国内专利精选

正一种消光PVC糊树脂及其制备方法:CN111057177A∥罗冬梅(沈阳化工股份有限公司),公开日期:2020-04-24公开了一种消光PVC糊树脂及其制备方法,聚合配方为:氯乙烯单体80～120份、复合乳化剂0.5～5份、油溶性引发剂0.005～0.05份、交联剂0.2～2份、助交联剂0.05～2份、去离子水90～150份。其中,复合乳化剂由阴离子表面活性剂和难溶助剂混合而成。采用该发明方法制备的消光PVC糊树脂,不但其可溶组分的聚合度范围为700～1 600,糊黏度为1 500～5 000 mPa·s,光泽度小于60%,而     

天业集团聚合工程中心一发明专利获授权

正近日,从国家知识产权局获悉,由天业集团兵团聚合工程中心申报的发明专利"一种含羟基氯乙烯-醋酸乙烯酯共聚树脂的制备方法"正式通过实质审查,并下发了"办理登记手续通知书"。据介绍,该发明提出了一种含羟基氯乙烯-醋酸乙烯酯共聚树脂的制备方法,使用该发明制造的含羟基氯乙烯-醋酸乙烯酯共聚树脂,白度高,溶解液无色透明,可应用于各种高档油漆、涂料、粘结剂     

氯乙烯-丙烯腈共聚物乳液合成技术及其表征

介绍了氯乙烯-丙烯腈共聚物的乳液聚合方法,研究了合成过程中乳化剂、引发剂的加入方式及工艺条件对共聚物性能的影响,并对共聚物进行了表征。结果表明:乳化剂的最佳投加方式为(以乳化剂/VCM表示):先投加0.02,反应开始后流加0.02;引发剂的最佳投加方式为(以引发剂/VCM表示):先投加0.012,反应开始后流加0.012。该共聚物具有优良的阻燃性能。     

Effect of initiators and ethoxylation degree of non‐ionic emulsifiers on vinyl acetate and butyl acrylate emulsion copolymerization in the loop reactor

Vinyl acetate and butyl acrylate copolymers were synthesized in the presence of ammonium persulfate and potassium persulfate initiators, mixture of non‐ionic and anionic emulsifiers, and polyvinyl alcohol as protective colloid in a loop reactor. The monomer ratio was chosen 85:15. The series of non‐ionic emulsifiers, which have 10–40 moles ethoxylated nonyl phenol, were combined with Nansa 66 (sodium dodecyl benzene sulfonate). The effects of the initiators on the physicochemical properties of copolymers were investigated by measuring conversion, viscosity, molecular weight, molecular weight distribution, and surface tension, respectively by using gravimetric method, Brookfield viscometer, gel permeation chromatograpy (GPC), and ring method. The effects of ethoxylation degrees of the non‐ionic emulsifiers to the same properties of copolymers were also investigated. It was determined that the copolymer viscosities showed different tendency for two initiators. They were increased by the increasing ethoxylation degree of the non‐ionic emulsifier for ammonium persulfate. In contrast, latex viscosity was decreased by increasing the ethoxylation degree in presence of potassium persulfate. Similar changes were also found in number average molecular weights of copolymers. On the other hand, weight average molecular weights of copolymers increased by increasing the ethoxylation degree of the non‐ionic emulsifier for both initiators. In the case of potassium persulfate, the surface tension values of copolymers increased by increasing the ethoxylation degree, but generally increasing the ethoxylation degree did not affect the surface tension of copolymer very seriously for two initiators. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 537–543, 2003     

乙酸乙烯酯-丙烯酸异辛酯-乙烯基乙酰氧基硅烷的乳液聚合

制备了乙酸乙烯酯-丙烯酸异辛酯(2-EHA)-乙烯基乙酰氧基硅烷三元共聚胶乳,研究了聚合工艺、乳化剂、保护胶和2-EHA质量分数对共聚反应、胶乳性能及共聚物性能的影响。结果表明,该乳液聚合体系中,预乳化工艺明显优于半连续法工艺;当以十二烷基硫酸钠／聚乙二醇辛基苯基醚为复合乳化剂、以聚乙烯醇为保护胶时,聚合反应平稳,所得胶乳具有很好的稳定性;随着2-EHA质量分数的增加,胶乳稳定性逐渐提高,共聚物的玻璃化转变温度和胶乳的最低成膜温度降低,但2-EHA对前者的影响明显大于对后者的影响;乳胶膜的吸水量在200h后达到饱和。     

有机硅改性醋丙乳液的制备与表征

采用半连续种子乳液聚合技术,以丙烯酸丁酯、醋酸乙烯酯和有机硅单体合成了有机硅改性醋丙乳液,并研究了有机硅含量、复合乳化剂配比、种子单体含量等对乳液聚合稳定性及乳液性能的影响。制备出的乳液稳定性良好,随着种子乳液单体含量的增加,乳胶粒粒径变小。     

Modification of poly(vinyl chloride). XXXIV. Crosslinked poly(vinyl chloride) via paste-processing

A novel PVC-crosslinking technique using 6-dibutylamino-1,3,5-triazine-2,4-dithiol (DB) was applied for a paste processing to produce a crosslinked PVC product. The paste formulation recommended in the present study consisted of 100 parts of PVC (Zeon 121), 60 parts of dioctyl phthalate, 0.2 parts of MgO, and 6 parts of a 50% solution of DB-Na in butylcarbitol, which gave a highly crosslinked and transparent sheet with an excellent stability for thermal discolouring. The increasing viscosity behaviour of the paste during storage is explained by the effect of interparticle attracting forces of DB-Na which coordinates to the ether oxygen atoms in the glycol derivatives adsorbed on the surface of PVC particles. The increased viscosity can be reduced by addition of 3 parts of N-butyl-benzene-sulfonamide. The tension-distortion properties at elevated temperatures were remarkably improved at the crosslinked product compared with the uncrosslinked. The mechanical properties of the two crosslinked products produced via paste processing and roll-blending are compared in regard to the differences of the uniformity of crosslinking units.     

基于苯基乙烯基酮双亲性嵌段物的光敏延时释药乳剂

聚苯基乙烯基酮（PPVK）在光照下能够发生主链断裂,基于这一特性,本文利用可逆加成-断裂链转移聚合（RAFT）以丙烯酸二甲氨基乙酯（DMAEA）和丙烯酸异辛酯（2-EHA）分别作为亲水性单体和疏水性单体,制备了双亲性三嵌段共聚物PDMAEA-b-PPVK-b-P（2-EHA）,并利用该双亲性嵌段物作为乳化剂制备了油酸乙酯为环保油相的可光控延时释放的油包水（W/O）型农药乳剂。对乳液的制备稳定性、光敏感特性以及光控药物释放特性进行了研究。结果表明,在油相与水相体积比为2∶1、嵌段物亲水段与亲油段聚合度之比为1∶5、嵌段物添加量为0.03g/mL且内水相pH=5时,制得的乳液具有良好的稳定性;在紫外光照下,乳液能够很快发生破乳;草甘膦药物释放实验表明,乳液的药物释放表现出光控特性,紫外光照25min后,水相药物草甘膦释放率达90%左右。