硅油对香波发泡力的影响

研究了聚二甲基硅氧烷 (简称硅油 )的相对分子质量 (粘度 )、硅油加入香波的温度、搅拌速度、加入方式对洗发香波发泡力的影响 ,得出含硅油香波的配制工艺条件     

二甲基硅油及其表面活性剂在化纤生产中的应用

综述了二甲基硅油及其表面活性剂在化纤油剂中的应用 ,化纤油剂应具有的高平滑性、高耐热等特性 ;介绍了改善油剂的综合性能及硅油表面活性剂用来提高纤维的可纺性等性能的方法。建议我国应尽快开发研制含硅油的化纤油剂     

美国高尔斯顿科技公司

氨纶油剂 分散性佳、解舒张力稳定及抗静电性好的油剂 填充料短纤维油剂 具有高滑爽性、蓬松性、白度及牢度的硅油系列产品 各种手感风格的无硅油剂、硬质棉油剂、及阻燃、抗菌、抗静电等功能油剂     

端羟基聚二甲基硅氧烷制备的改进

以八甲基环四硅氧烷为单体,四甲基四乙烯基环四硅氧烷为改性单体,羟基硅油为封端剂和相对分子质量调节剂,四甲基氢氧化铵为催化剂,在羟基硅油质量分数小于0.13%,催化剂质量分数为0.004%～0.007%时,采用共聚法制备了相对分子质量大于45×104,收率大于90%的端羟基聚二甲基硅氧烷。结果表明,随羟基硅油质量分数的增加,试样的相对分子质量和收率都呈下降的趋势;随四甲基氢氧化铵质量分数的增大,试样相对分子质量减小而收率逐渐增加并趋向平稳。     

橡胶相对分子质量及其分布的测试与分析

利用凝胶渗透色谱(GPC)法测试几种常用橡胶的相对分子质量及其分布,分析其与胶料门尼粘度和物理性能的相关性。结果表明,天然橡胶(NR)的重均相对分子质量较大,相对分子质量分布较宽,不同产地、厂家生产的NR相对分子质量及其分布、生胶门尼粘度差异较大。GPC法测得的NR相对分子质量及其分布与生胶门尼粘度之间的变化规律具有局限性。橡胶相对分子质量分布指数的差异影响胶料加工性能。橡胶微观结构是影响硫化胶物理性能的主要因素。     

EO/PO无规共聚醚的合成及其在帘子线油剂中的应用

研究了高速纺丝油剂用EO/PO无规聚醚的合成方法。EO/PO无规聚醚的相对分子质量不同,其黏度、表面张力、摩擦系数等均不相同,综合分析认为聚醚最合适的相对分子质量应为3 000左右;聚醚的相对分子质量分布与油剂的稳定性关系密切,相对分子质量分布应越小越好。EO/PO值会影响聚醚的黏度、凝点、溶解性等性能,综合考虑各种性能,其比值以3为宜。此外,使用自制的聚醚作为主要平滑剂调配出锦纶6帘子线油剂,工业应用实验取得了满意的效果。     

乳化液型涤纶工业丝油剂的性能及应用

开发了多元醇聚醚、多元醇脂肪酸酯、聚醚脂肪酸酯作为主要单体的乳化液型涤纶工业丝油剂,对单体的耐热性和油剂的性能进行评价,并与日本竹本公司的F7152油剂进行比较.结果表明:乳化液型涤纶工业丝油剂的单体的耐热性优良;油剂乳化液具有良好的稳定性和优良的粘度-浓度特性和粘度-温度特性,所开发的油剂与进口F7152油剂相比,具...     

乙烯基硅油对再生热硫化硅橡胶性能的影响

研究乙烯基硅油的粘度和用量对机械剪切法再生硅橡胶(RSiR)性能的影响。结果表明:随着乙烯基硅油粘度的增大,RSiR胶料的正硫化时间延长,物理性能下降;随着乙烯基硅油用量的增大,RSiR胶料的最大转矩减小,正硫化时间缩短,拉伸强度和拉断伸长率增大;当乙烯基硅油粘度为1Pa·s、用量为10份时,RSiR硫化胶的物理性能较好。RSiR只有一个玻璃化温度(T_g),随着乙烯基硅油用量的增大,RSiR硫化胶的T_g朝低温方向移动,损耗因子降低。加入乙烯基硅油有助于提高RSiR硫化胶的热稳定性。     

硅油剂及其硅污染

在生产PAN原丝过程中,干燥致密化之前要上油剂,使每根单丝表面形成油膜,防止单丝之间粘连和并丝等。目前,油剂种类主要是硅油剂。但是,硅油剂会带来硅污染,使碳纤维性能下降,这是上硅系油剂的负面影响。如何防止硅污染已提到议事日程,值得关注。本文就硅系油剂及其硅污染做一概述,以引起同仁们的重视。     

软泡硅油用高相对分子质量甲氧基封端聚醚的研究及应用

选用双金属氰化络合物(MMC)催化剂通过调整工艺合成了相对分子质量分布窄的高相对分子质量烯丙醇聚醚,并进一步采用两步法封端工艺,得到了封端率超过92%的高相对分子质量甲氧基封端聚醚。在铂系催化体系作用下,与低含氢硅油进行加成反应,制备了软质泡沫用硅油,并对其结构及发泡稳定性进行了初步评价。结果表明,用该聚醚合成软泡硅油结构稳定,能满足软泡发泡要求,且泡沬性能均与国外同类产品接近。     

PET树脂中二氧化钛含量对纤维后拉伸的影响

通过改变纺丝温度、拉伸温度、不同长径比喷丝板及油剂 ,研究了不同二氧化钛含量对纤维拉伸性能的影响 ,发现适量添加二氧化钛可改善原丝性能。从纤维的最终性能指标、光泽综合考虑 ,切片中二氧化钛的质量分数不宜超过 0 .0 8%。适当控制纺丝温度及拉伸温度 ,并选择适当的油剂 ,大有光切片可经纺丝超倍拉伸制得高强丝。     

涤纶高速纺油剂T&K-1128的应用

对国产 POY油剂 T&K-112 8与德国进口油剂 K10 5在 POY,DTY的生产应用情况进行了比较 ,探讨了油剂耐热性和 DTY加工过程中的白粉情况。试验证明 ,T&K-112 8涤纶高速纺油剂与 K10 5油剂性能相似 ,且可纺性好 ,产品满卷率及一等品率均较高 ,能满足高速纺丝的要求 ,且价格低廉 ,能大大降低涤纶生产成本     

1-Methyl-1-Vinyl-3,3,5,5-Tetraphenylcyclotrisiloxane: An Organofunctional Cyclotrisiloxane

The characterization of 1-methyl-1-vinyl-3,3,5,5-tetraphenylcyclotrisiloxane by NMR(¹H,¹³C,²⁹Si) and X-ray crystallography is reported. The central siloxane ring is planar with Si–O bond lengths and angles which are similar to those found in the structures of other cyclotrisiloxanes. There is significant thermal motion of the methyl and vinyl groups. Very low incorporation of the siloxane is observed in the radical catalyzed copolymerization of the siloxane with styrene.     

Polymer Chain Relaxation Mechanisms in Siloxane-Carbosilane Systems

The effect of sterically hindered carbosilane moieties, situated as end groups in telechelic oligodimethylsiloxanes, was investigated with respect to the mobility of silicon atoms in the main chain. The relaxation phenomena in such crowded systems were studied by DSC and NMR methods. Spin–lattice relaxation times T ₁ (²⁹Si NMR) of silicon atoms in the oligomer chain were estimated and related to the distance between a given siloxane unit and the carbosilane moiety. It was found that the mobility of terminal siloxane units has been substantially affected. However, in the long range, the effect does not to seem to outweigh the intrinsic flexibility of the siloxane bonds.     

Fluorinated siloxane amine oligomers

Fluorine‐containing siloxane oligomers were made from bis(aminopropyl)tetramethyldisiloxane and trimethyltris(trifluoropropyl)cyclotrisiloxane. These materials were characterized by IR spectroscopy, size exclusion chromatography, nonaqueous colorimetric end group titration, and ¹H‐NMR. The end groups of one oligomer were chemically modified for an increased NMR signal for molecular weight determination. The cyclic trimeric siloxane starting material was additionally studied via ¹³C‐, ²⁹Si‐, and ¹⁹F‐NMR. Two forms of it were used: a white solid obtained at room temperature, and a colorless liquid isolated at low temperature. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1315–1320, 2000     

双苯基七聚笼形倍半硅氧烷的合成与表征

通过环戊基三氯硅烷的可控水解,合成出七聚（环戊基）倍半硅氧烷三硅醇（化合物1）,进一步控制反应物料配比,合成出一取代（三甲基硅氧基）七聚（环戊基）二硅醇（化合物2）,化合物2与过量的苯基二甲基氯硅烷反应得到含有两个苯基官能团的笼形倍半硅氧烷（POSS）（化合物3）.合成的产物分别用FTIR、¹H NMR、²⁹Si NMR方法进行了表征.结果表明通过此合成路线可得到高产率的结构清晰的双官能POSS,并提出了合成双官能POSS的新方案.     

Silphenylene and silphenylene-siloxane oligomers: Structure-property relationships

Some representative oligomers were prepared by polycondensation reactions of dimethyldichlorosilane with 1,4-di-Grignard reagent prepared from 1,4-dibromobenzene in diethyl ether. The structural characterization of the oligomers was carried out by FTIR and¹H,¹³C, and²⁹Si NMR spectroscopy. TheM _n values were determined by vapor pressure osmometry. TheT _g values were measured by DSC and the thermodegradation process was analyzed by TGA. In all cases the oligomers prepared in the absence of the blocking end group showed siloxane units in the main chain, which were quantified by¹H and²⁹Si NMR.²⁹Si NMR was also used to determine the oligomer sequence. It was possible to correlate the and structure withT _g and with temperature at 3% weight loss. The results agree with these obtained for structurally similar polymers.     

29Si固体核磁共振技术在水泥基材料定量分析中的应用

29 Si固体核磁共振技术是目前研究水泥基材料定量分析的有效工具之一,在水泥化学领域应用广泛.从现代分析测试技术入手,突出了29 Si固体核磁共振技术在水泥化学中的优势,并结合29 Si固体核磁共振定量分析技术和数据,从硅酸盐水泥熟料矿物组分、硅酸盐水泥水化过程量化表征及硅灰掺入的其他水泥基材料的定量分析等方面综述了29 Si固体核磁共振技术在水泥基材料定量分析中的应用,总结了29 Si固体核磁共振技术在水泥基材料领域定量分析存在的问题并展望了核磁共振技术在水泥基材料领域的发展趋势.     

29Si NMR Spectroscopy of Silicate Anions in Hydrothermally Formed C-S-H

Hydrothermal treatment of lime–silica mixtures under saturated steam pressures below 200°C usually gives C-S-H as an initial product, which reacts further to give crystalline calcium silicate hydrates. In this paper, C-S-H was hydro–thermally prepared using CaO and silicic acid at Ca/Si ratios of 0.3 to 2.0 and 120° to 180°C for 2 h. The C-S-H was examined mainly using ²⁹Si NMR by the magic angle spinning gate proton decoupling and cross polarization magic angle spinning methods. XRD for all of the C-S-H showed bands at 0.304, 0.280, 0.183, and 0.166 nm. NMR results showed that all of the C-S-H contained single chains of silicate anion, which became progressively longer as the Ca/Si ratio decreased, i.e., as the system became richer in silica. This was independent of the preparation temperature. The 0.8 ratio preparations at 180°C contained small amounts of double-chain structure of 1.1-nm tobermorite. The reaction processing in the lime- silicic acid mixtures is also discussed.