Novel lignosulfonate/N,N-dimethylacrylamide/γ-methacryloxypropyl trimethoxy silane graft copolymer as a filtration reducer for water-based drilling fluids

The redox system consisting of ammonium persulfate and sodium bisulfite was used as initiator, N,N-dimethylacrylamide (DMAA) and γ-methacryloxypropyl trimethoxy silane (KH570) were grafted onto sodium lignosulfonate (LS) in aqueous solution as reaction monomers, and a novel LS/KH570/DMAA graft copolymer filtrate reducer was synthesized. The structure of the copolymer was characterized by Fourier transform infrared spectrometer and nuclear magnetic resonance instrument. The result revealed that DMAA and KH570 were successfully grafted onto sodium LS. In addition, the thermal stability of the copolymer was determined by thermogravimetric analyzer and the micromorphology of filter cake of water-based drilling fluids (WBDFs) containing LS/KH570/DMAA was analyzed by scanning electron microscopy. At the same time, the rheological and filtration properties of WBDFs containing copolymer with different concentrations were further evaluated. The results showed that when the copolymer concentration was 3 wt %, the fluid loss of bentonite-based drilling fluids was only 6.2 mL before aging, and 9.8 mL after aging at 180 °C for 16 h. The fluid-loss control mechanism of LS/KH570/DMAA was investigated through clay particle distribution analysis and zeta potential measurement of WBDFs. Moreover, the WBDFs containing copolymer exhibit excellent performance in reducing fluid loss under the invasion of calcium salts. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48274.     

落叶松树皮栲胶废渣各组分及其磺化产物的表面活性对比研究

分析了兴安落叶松树皮栲胶废渣的主要化学组分及各组分的磺化产物对木质素磺酸盐的表面活性的作用,发现树皮栲胶废渣制备的木质素磺酸盐表面活性、分散性能和净浆流动度较木材木质素磺酸盐高。表面活性和分散性能好的主要原因是栲胶废渣中可溶单宁和红粉的存在,而具有更好的净浆流动度是因为可溶单宁和酚酸的存在。     

木素基絮凝脱色剂的制备及其应用性能研究

以木质素磺酸钙为原料，经接枝、胺甲基化制备了木素基絮凝脱色剂，考察了它们对活性艳橙K—G和活性黄X—R的脱色处理效果，实验证明，在适当的条件下，可达到很好的脱色效果。     

尿素改性木素磺酸钙制备缓释氮肥的工艺研究

对尿素改性木素磺酸钙合成缓释有机氮肥的工艺条件进行了研究,通过正交实验确定了反应pH值、时间、温度、尿素用量等工艺条件对改性反应的影响程度,测定了改性后木素磺酸钙中的总氮和铵态氮含量。结果表明,pH值为3、温度85℃、时间4 h、m尿素∶m木素=(1-1.6)∶1是较为理想的反应条件,改性木素磺酸钙产品的总氮含量最高达9.84%、铵态氮含量为0.60%。     

球形木质素基离子交换树脂的合成及其对阳离子染料的吸附性能

以木质素磺酸盐为原料,采用合适的分散介质和成球技术,成功地合成了球状木质素基离子交换树脂,并讨论了它对阳离子染料的吸附性能.树脂对低浓度和高浓度的阳离子染料溶液均有很好的吸附作用,对阳离子艳红的饱和吸附量可达250mg/g干树脂;而且前期吸附速度快,30min后吸附速率趋缓,升高温度有利于前期吸附速率的增大.结果表明树脂对阳离子染料的吸附具有很好的实际应用前景.     

LS-g-P( AA-co-AM)高吸水性树脂的制备及性能

通过木质素磺酸盐与丙烯酰胺及部分中和的丙烯酸接枝共聚,将木质素磺酸盐引入至高吸水性树脂中,制备了木质素基高吸水性树脂LS-g-P(AA-co-AM),研究了其吸水保水性能.结果表明:被吸收液pH值对LS-g-P(AA-co-AM)树脂吸水性能有很大影响,当被吸收液的pH值在6～7时,树脂的吸水能力最强.树脂具有较好的重...     

Heat- and lignosulfonate-treated canola meal as a source of ruminal undegradable protein for lactating dairy cows

This experiment used 18 lactating Holstein cows in a 3 x 3 Latin square replicated 6 times to determine the effectiveness of processing with moist heat or moist heat combined with lignosulfonate (LSO3) for increasing the ruminal undegradable fraction of canola meal for use as a protein supplement for lactating dairy cows. Diets were formulated to be isonitrogenous and contained one of 3 forms of canola meal; untreated canola meal (UCM), heat-treated canola meal (HTCM) or heat-and LSO3-treated canola meal (LSO3CM). Total collection of urine and feces was taken from each cow during the last 5 d of each 42-d experimental period. Milk production was greater for cows fed the LSO3CM diet (36.6 kg/d) than for cows fed the UCM diet (34.8 kg/d) but did not differ from cows fed the HTCM diet (35.3 kg/d). Digestibility of crude protein was lower for cows supplemented with LSO3CM and they had reduced concentrations of ruminal ammonia N, blood urea N, and milk urea N compared with cows supplemented with UCM or HTCM. Dry matter intake and apparent digestibilities of neutral and acid detergent fiber were increased in cows fed the LSO3CM diet. Urinary N excretion (as % of N intake) was reduced in cows fed the LSO3CM diet. These results indicate that moist heat combined with LSO3 treatment of canola meal was effective in increasing the proportion of crude protein digested in the lower digestive tract of lactating cows and was therefore used more effectively as a source of protein than UCM or HTCM.     

陶瓷浆料用木质素系分散剂的性能及配伍研究

考察了改性木质素磺酸钠GCL3S系列产品对墙地砖陶瓷浆料应用性能的影响,结果表明,GCL3S具有较好的分散稳定性能。当低相对分子质量(以下简称分子量)的GCL3S-1掺量(分散剂占陶瓷粉料的质量分数,下同)为0.3%时,固含量(固体占陶瓷浆体的质量分数,下同)为71.26%的陶瓷浆料流出时间仅为41.79 s,厚化度为1.37;随GCL3S分子量增加,陶瓷浆料性能先提高后降低,重均分子量Mw=27 700的GCL3S-2对浆料的流动性及分散稳定性能最好。GCL3S产品与水玻璃、六偏磷酸钠、焦磷酸钠、三聚磷酸钠复配能进一步提高其应用性能,其中与六偏磷酸钠按质量比1∶1复配,总掺量为0.2%时,陶瓷浆料流出时间仅38.81 s,分散性能明显优于目前常用的无机盐分散剂。     

改性坡缕石黏土对水中木质素磺酸钠吸附研究

用盐酸和焙烧处理的方法对坡缕石黏土进行了改性,制备了酸处理坡缕石黏土和热处理坡缕石黏土,用XRD和TEM对不同方法处理的坡缕石黏土进行了结构和形貌表征,并使用黏土对木质素磺酸盐废水进行了吸附研究。结果表明,在盐酸浓度为1.0 mol/L,60～70℃,改性处理6 h条件下制得的吸附剂相对于原土及热处理的坡缕石黏土吸附效果最好,动力学研究表明吸附过程符合准二级动力学模型,吸附等温线符合Langmuir吸附模型,其平衡吸附量可达到343.99 mg/g。实验证明该吸附过程是一个放热过程。     

木质素磺酸盐改性聚羧酸减水剂的合成

采用自由基共聚法,将大单体聚乙二醇单甲醚甲基丙烯酸酯(MPA)、木质素磺酸钠(LS)、丙烯酸(AA)和甲基丙烯磺酸钠(MAS)4种单体进行共聚,合成木质素磺酸盐改性聚羧酸减水剂。在n(AA)∶n(MPA)∶n(MAS)=5.0∶1.0∶1.0,引发剂用量为2.5%,LS用量为9%,反应温度80℃和反应时间为5 h的条件下合成的减水剂,掺量为0.2%、水灰比为0.29时,掺减水剂水泥净浆初始流动度达290 mm、30 min经时流动度为285 mm,流动度保持性良好。减水剂PC-LS掺量为0.4%时,砂浆的减水率达30%。