钠基蒙脱土交联增稠剂的合成及性能

采用钠基蒙脱土为交联剂合成了新型的具有较高抗电解质性能的增稠剂. 聚合物链一端或两端接枝于蒙脱土片层上. 测试了该复合增稠剂的增稠性能和抗NaCl、NaHCO3的性能. 结果表明,钠基蒙脱土交联增稠剂具有优异的抗电解质性能. Bis交联增稠剂5%糊料加入5 mL 2 mol/L NaCl溶液后,黏度由118 Pa·s迅速降低为6 Pa·s,加入8 mL 2 mol/L NaCl溶液后,旋转黏度基本为零;而钠基蒙脱土交联增稠剂5%糊料加入5 mL 2 mol/L的NaCl溶液前后,旋转黏度分别为63和24 Pa·s,加入8 mL 2 mol/L NaCl溶液后,旋转黏度仍保持16.5 Pa·s.     

(丙烯酰胺-丙烯酸十六酯)共聚物的合成及其增稠性能研究

采用沉淀聚合法合成丙烯酰胺 -丙烯酸十六酯共聚物。重点讨论了合成条件如单体配比、引发剂用量、温度等对共聚反应的影响以及共聚物对苯丙乳胶的增稠性能的影响。并用DMTA和凯达尔定氮法表征了共聚物组成 ,结果表明 :所合成的共聚物可以作为疏水缔合型增稠剂使用     

聚丙烯酸增稠剂的反相乳液聚合及其增稠性能

采用具有增稠和抗电解质作用的丙烯酸聚氧乙烯酯活性单体和具有聚合稳定作用的高分子表面活性剂,通过反相乳液聚合法合成了涂料印花用丙烯酸系增稠剂.研究了活性单体、交联剂、反应时间等因素对产物性能的影响.得出活性单体用量占共聚单体摩尔数的0.5%,交联剂占共聚单体质量的0.3%,反应时间为1.5h时,增稠剂的综合效果最好.     

含二十二烷基聚氧乙烯醚甲基丙烯酸酯功能单体的缔合型乳液增稠剂的制备及表征

以甲基丙烯酸、丙烯酸乙酯、邻苯二甲酸二烯丙酯和不同量的功能单体二十二烷基聚氧乙烯醚甲基丙烯酸酯(BEM)为原料,采用半连续乳液聚合方法合成了疏水改性碱溶性缔合型增稠剂乳液.测定了增稠剂乳液的粘度、透光率、乳胶粒粒径及其分布等性能,考察了不同固含量下乳液粘度和透光率随pH的变化情况.结果表明随着BEM用量的增加,乳胶粒粒径逐渐增大.随着pH值的增加,乳液的粘度首先迅速升高,然后缓慢下降.与不含BEM的增稠剂乳液相比,当乳液固含量大于0.5%,BEM含量占单体量低于5.0wt%时,该缔合型增稠剂的增稠效果和抗剪切性有显著提高,BEM含量较高(8.0wt%或更高)时反而使增稠效果和抗剪切性变差.在此基础上研究了增稠剂对苯丙乳液的增稠效应,结果显示BEM含量占单体量的2.5wt%时,对苯丙乳液的增稠作用最好.与使用功能单体三苯乙基苯酚聚氧乙烯醚甲基丙烯酸酯改性的增稠剂相比,含BEM的增稠剂在BEM用量较少的情况下就能起到明显的增稠效果.     

N－烷基吡咯烷酮的合成

Ｎ－烷基吡咯烷酮的合成王锡臣，张颂培，祝钧（北京轻工业学院化工系北京１０００３７）关键词烷基吡咯烷酮，固－液相转移催化，合成Ｎ－烷基吡咯烷酮可用作香波增稠剂，染发烫发调理剂，啤酒、葡萄酒中多酚洁净化剂和洗涤去渍剂等［１］，其合成一般采用吡咯烷酮Ｎ－烷...     

含三苯基乙基苯氧基聚氧乙烯醚甲基丙烯酸酯功能单体的缔合型乳液增稠剂的制备及增稠机理

采用半连续法乳液聚合以甲基丙烯酸、丙烯酸乙酯、邻苯二甲酸二烯丙酯和不同量的功能单体三苯基乙基苯氧基聚氧乙烯醚甲基丙烯酸酯(SEM-25)为原料合成了疏水改性碱溶性增稠剂乳液. 测定了增稠剂乳液的粘度、透光率、pH、粒径及其分布, 结果表明随着pH值的增加, 乳液的粘度和透光率首先迅速升高, 然后缓慢下降. 随着SEM-25用量的增加, 乳胶粒的粒径先增大后减小. 与不含SEM-25的乳液增稠剂相比较, SEM-25低含量增稠剂的增稠效果和抗剪切性没有提高, 只有当SEM-25用量提高至单体质量的12%, 且乳液固含量大于0.65%时, 所制备缔合型增稠剂乳液的粘度和流变性比不含SEM-25的增稠剂才有明显提高. 在此基础上研究了增稠剂对苯丙乳液的增稠性. 含有增稠剂的苯丙乳液的粘度和透光率随pH值的变化与纯增稠剂乳液的变化类似. 只有当加入0.34 wt%苯丙乳液固体质量的增稠剂, 并且增稠剂中SEM-25含量达到5 wt%时苯丙乳液的粘度与使用不含SEM-25的增稠剂增稠的粘度相比才有明显增高. 在此基础上对增稠剂的增稠机理进行了探讨.     

(甲基)丙烯酸高级醇酯的合成及其应用

综述了(甲基)丙烯酸高级醇酯的主要合成方法、合成反应中影响酯产率的主要因素及其在具有“温度开关”特性的智能材料、原油降粘剂、增稠剂、吸油性树脂、复鞣加脂剂、流平剂等领域的应用。     

交联剂含量对憎水改性缔合型增稠剂性能的影响

以甲基丙烯酸、丙烯酸乙酯和功能单体二十二烷基聚氧乙烯醚甲基丙烯酸酯为原料,过硫酸铵为引发剂,变化交联剂邻苯二甲酸二烯丙酯(DAP)的量,采用半连续乳液聚合方法合成了DAP含量不同的憎水改性缔合型增稠剂乳液.测定了乳液的黏度和乳胶粒粒径及其分布等性能.考察了乳液运动黏度和透光率随pH的变化.随着pH值的增加,乳液的透光率...     

油醇系浓缩缔合聚合物压裂液增稠剂的合成及其性能研究

以丙烯酰胺(AM),2-丙烯酰胺-2-甲基丙磺酸钠(AMPSNa)和甲基丙烯酸十六烷基酯(MPA)为单体[n(AM)∶n(AMPSNa)∶n(MPA)=35∶4.5∶0.5],0.1%过硫酸钾/亚硫酸氢钠为引发剂,于35℃聚合4 h合成了一种疏水缔合聚合物型压裂液增稠剂(AF),其形貌和增稠性能经TEM和流变仪表征。结果表明:AF在水溶液中可形成密集的空间网络结构;CACAF为1 200 mg·L-1。以白油为外相,甲醇为内相,AF为增稠剂,制备了油醇浓缩缔合聚合物压裂液增稠剂CAF,其性能经流变仪和表面张力仪表征。结果表明:0.65%CAF于140℃/170 s-1剪切1 h,表观黏度为77.1 m Pa·s,高温抗剪切性较好;于95℃破胶3 h,破胶液表观黏度,表面张力和残渣含量分别为1.32 m Pa·s,26.9 m N·m-1和25.8 mg·L-1,破胶返排性较好。     

淀粉共聚物的合成与应用

本文介绍了淀粉共聚物的合成方法,包括自由基引发、阴离子引发和其它引发方法等;以及共聚物的应用范围:增稠剂、絮凝剂、粘合剂、吸水剂和上浆剂等.     

涂料印花增稠剂PTA-1性能的研究

本文报道了对影响聚丙烯酸系PTA—1增稠剂增稠性质的PH值、电解质、络合物等因素的试验研究,结果表明PTA—1具有良好的增稠性和抗离子性,达到国外同类产品水平。     

增稠剂对TL-615苯丙涂料性能的影响

This paper has described the characteristics and thickening mechanism of cellulose thickener, associated polyurethane thickener and alkali-swelling acrylic emulsion thickener. In this passage, the influence on the function of TL-615 styrene acrylic latex coating such as theological behavior, water and alkali resistance, scrub resistance,storage stability, adhesion etc. were introduced.     

Mechanism of the thickening reaction of polyester resins: Study on models

The thickening reaction of polyester resins is investigated using model compounds, diesters or polyesters of 1,2-propanediol and phthalic acid with dihydroxy or dicarboxy end groups. Soluble magnesium acetylacetonate was found to be an effective thickener, and for the first time it was possible to study a thickening reaction in homogeneous media (THF solutions). The results are compared with those obtained with MgO. The proposed mechanism supposes that the central step consists of the formation and the aggregation of magnesium carboxylates in ionic areas, with entanglement of attached polyester chains. This fits our experimental results better than the hypothesis of coordination of magnesium carboxylates by ester or hydroxyl groups of the chains^2–6 or than the hypothesis of the formation of linear high molecular weight compounds.^7–9     

Crystallization and melting of narrow composition distribution polyethylenes: Investigation and implications of crystal thickening

The crystal structure produced during the isothermal crystallization of polyethylene (PE) copolymers with a broad range of comonomer concentrations was determined by the measurement of the melting endotherms directly after crystallization. PE copolymers with higher concentrations of short‐chain branches (≥10 branches per 1000 total carbon atoms) exhibited strong resistance to crystal thickening during isothermal crystallization. Negligible thickening, estimated to be only about 0.1 nm in 10 min of isothermal crystallization, was observed. The side‐chain branches apparently acted as limiting points of chain incorporation into the crystals, which exhibited great resistance to the modification of their position, that is, crystal thickening. Even with long periods (up to 8 h) of isothermal storage, crystal thickening was very small or negligible, about 0.3 nm. The crystal thickness was calculated from differential scanning calorimetry data. The behavior of copolymers with lower branching concentrations and the unbranched PE homopolymer was quite different from that of the copolymers with higher branching. Polymers with low or no branching exhibited the initial crystallization of a thinner crystal population, which thickened substantially with increasing time. The thickening observed for these lower or unbranched polymers was an order of magnitude larger, that is, 1.6–2.0 nm in 10 min of isothermal crystallization. Copolymers with higher concentrations of branching had relatively short sequence lengths of ethylene units between branch points, and this resulted in strong control over the crystal thickness by the branch points and great resistance to crystal thickening, even with long times of isothermal crystallization. Copolymers with low concentrations of branching had relatively long sequence lengths of ethylene units between branch points, and this resulted in little control over the crystal thickness by the branch points and rapid crystal thickening upon isothermal crystallization. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 235–246, 2003     

高吸水性树脂

高吸水性树脂,可以吸收其本身重量的几百倍水。将水溶性高分子如羧甲基纤维素、聚丙烯酸钠盐或聚乙烯醇进行轻微的交联可以得到。由于其高吸水性、在压力下的高保水性和高增稠性,被广泛应用于纸尿布、生理巾、土壤保水剂、工业脱水剂、增稠剂等。     

改性聚合物压裂液的合成及其性能

为了提高油田压裂改造中常用水基压裂液的耐温和耐盐性能,本文以丙烯酸(AA)、丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和季铵盐型长尾疏水单体(DS)为原料,制备了疏水改性聚合物增稠剂(AAAD)。 有机硼酸盐与葡萄糖酸钠形成配合物(GS-2)为交联剂,再加入其它添加剂,AAAD通过交联反应,制备出改性聚合物压裂液。 评价了该体系的流变性、黏弹性、耐温性、抗盐性和破胶性等性能。 结果表明,压裂液在温度150 ℃、剪切速率170 s^-1条件下具有良好的流变性能;在90 ℃,破胶剂过硫酸铵质量分数为0.01%条件下,4 h即可破胶,破胶液黏度为1.6 mPa·s。