Synthesis and characterization of new polysiloxane bearing vinylic function and its application for the preparation of poly (silicone-co-acrylate)/montmorillonite nanocomposite emulsion

A new silicone containing acrylic monomer, methacryloxyethyl polymethylhydrosiloxane ether (MEPMHSE), based on polymethylhydrosiloxane (PMHS) and 2-hydroxyethyl methacrylate (HEMA) has been synthesized for formulation of nanocomposite emulsion. Then Poly (silicone-co-acrylate)/montmorillonite (PSAM)/nanocomposite emulsion were prepared by in situ intercalative emulsion polymerization of methyl methacrylate (MMA), butyl acrylate (BA), methacrylic acid (MAA) and MEPMHSE, in the presence of organic modified montmorillonite (OMMT) with different OMMT contents (0, 0.5, 1.0, 1.5 and 2 wt%) and auxiliary agents in the presence of potassium persulphate (KPS) as initiator. Alkylphenol ethersulphate and Arkupal N-300 were used as anionic and non-ionic emulsifiers, respectively. The resulting monomer was characterized by Fourier transformer infrared spectroscopy (FTIR), proton (¹H NMR), and carbon (¹³C NMR) nuclear magnetic resonance spectroscopes. The OMMT was characterized by FTIR and X-ray diffraction (XRD). The nanocomposite emulsions were characterized by using Fourier transform infrared spectroscopy (FTIR), laser light scattering and surface tension. Thermal properties of the copolymers were studied by using thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA) and then the effects of OMMT percent on the water absorption ratio and drying speed were examined. Results showed that OMMT could improve the properties of emulsion, in other words, the properties of nanocomposite emulsion were better when compared with those of the silicone–acrylate emulsion. The property of nanocomposite emulsion containing 1 wt% OMMT was the best one, and the following advantages were obtained: smaller particle size, faster drying speed, smaller surface tension, and improved resistant water by the incorporation of OMMT.     

有机硅助剂对烟嘧磺隆增效作用研究

通过盆栽实验和田间小区实验,研究有机硅助剂对烟嘧磺隆的增效作用。结果表明,烟嘧磺隆加入有机硅助剂后增效作用明显,特别是对于阔叶杂草防效增效显著;不同有机硅助剂对烟嘧磺隆的增效作用相当;烟嘧磺隆施药剂量40a.i.g/hm^2,加入质量分数为0.1%的有机硅助剂ss3#后对杂草防效与烟嘧磺隆施药剂量60a.i.g/hm^2防效相当;添加有机硅助剂能够降低烟嘧磺隆用药量及用水量。     

有机硅改性丙烯酸酯乳液的性能研究

采用-γ甲基丙烯酰氧基丙基三甲基硅烷(KH570)改性丙烯酸酯类聚合物,合成了丙烯酸酯乳液,研究了单体配比、乳化剂用量、聚合方法对乳液性能的影响。结果表明单体配比为MMA﹕BA﹕MAA=54﹕44﹕2、乳化剂用量为3%时乳液的综合性能较好。     

水溶性有机硅柔软剂的合成与应用

研究了影响水溶性有机硅柔软剂MEPS合成和性能的主要因素,提出了适宜的原料和工艺条件。应用表明:MEPS使用方便,能赋予织物弹性、柔软、丰满、亲水、凉爽等风格。     

有机硅钻井液在河南张店油田的应用

河南油田张店地区地层黏土矿物含量高达60%～70%,地层倾角大,钻井过程中存在严重的地层造浆和井塌问题.由实验优选出高分子量聚合物、GW-1、OSAM-K及膨润土加量,形成了有机硅钻井液.经过在张店油田南38区块4口井中的应用表明,有机硅钻井液能有效地抑制地层造浆,防止井壁坍塌,减少井下复杂情况.应用有机硅钻井液的井,钻井液密度低,井径扩大率小,没有出现井塌、划眼和起下钻遇阻卡现象,4口井电测一次成功,没有因造浆外排钻井液.     

γ-甲基丙烯酰氧丙基三(三甲基硅氧基)硅烷的制备及其乳液聚合研究

通过 γ-甲基丙烯酰氧丙基三甲氧基硅烷 ( KH-5 70 )与三甲基氯硅烷共水解 ,进一步发生缩合反应 ,制备了γ-甲基丙烯酰氧丙基三 (三甲基硅氧基 )硅烷。并通过乳液聚合法制备了该单体的自聚乳液 ,对聚合工艺进行了初步探讨 ,用红外光谱对聚合产物进行了表征。同时 ,研究了乳化剂的种类及用量对反应的影响 ,发现采用有机硅乳化剂和阴离子乳化剂复配的乳化体系 ,可得到稳定性强、粒度适中的自聚乳液。     

有机硅添加剂对热处理粘胶纤维结构和性能的影响

借助XPS、SEM等研究了有机硅添加剂对热处理粘胶纤维的结构和性能的影响。结果表明：浸渍有机硅添加剂的粘胶纤维在热处理时，由于有机硅具有耐高温、防粘连，憎水、化学稳定性好等特性，对纤维表面可以起到保护作用；使其在热处理后，表面空洞减少，纤维的分线性得到改善，从而提高了它的抗拉强度。当有机硅添加剂的质量分数为4．79％时，所获炭纤维抗拉强度的增加幅度高达126．3％。浸渍有机硅添加剂的粘胶纤维在热处理后，Si元素主要以SiO2形式存在于纤维表面。     

有机硅防雾耐磨透明涂层的固化分析及性能研究

对有机硅防雾耐磨涂料的固化反应过程用差热式扫描量热仪(DSC)进行分析,再用FTIR在位跟踪固化反应过程中特征官能团吸收峰的变化.结果表明,有机硅胶体在140℃左右固化,胶体中缔合羟基间脱水缩合速率很高,羟基脱水程度与固化温度有关,温度越高,达平衡时羟基的浓度越低,羟基浓度变化最大是在100～130℃,由此确定最佳固化反应温度为120℃,反应时间为1h.把涂料分别涂覆在聚碳酸酯(PC)片材、聚酯(PET)薄膜、聚酯(PET)不干胶薄膜上,所得涂层的防雾性、耐磨性、透明性、粘接性、抗破裂性优良,表面均一平整,铅笔硬度可达3H-4H,与水的接触角为10°左右.