UV固化SiO_2/超支化聚氨酯丙烯酸酯透明涂层制备与性能

以TEOS和MAPTMS改性硅溶胶为无机组分,以超支化聚氨酯丙烯酸酯(HBPUA)为有机组分,制备了可UV固化HBPUA/(MAPTMS-SiO2)杂化涂层材料,nSiO2∶nMAPTMS=1∶2,改性硅溶胶用量为30ω/%,HBPUA/(MAPTMS-SiO2)杂化涂层材料的凝胶时间大于180 d,透光率为92.8%,硬度为4 H,附着力为0级,柔韧性为3 mm,冲击强度为46 kg·cm,磨耗量为17.5 mg,涂层性能较佳。     

紫外光固化PUA/纳米SiO_2杂化涂层的制备与性能

采用γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)对硅溶胶改性,将改性的硅溶胶与聚氨酯丙烯酸酯(PUA)低聚物共混,制备出聚碳酸酯(PC)用紫外光(UV)固化耐磨涂层。用红外光谱仪、热重分析仪、激光粒度仪、接触角测量仪对改性前后的纳米二氧化硅(SiO_2)进行了分析表征,并对制备的UV固化涂层的透光率、雾度、表面硬度和附着力进行了测试。结果表明:纳米SiO_2表面接枝上了KH-570,且亲水性降低。当KH-570用量为60%、改性纳米SiO_2用量为4%时,涂覆UV固化涂层的PC的耐磨性得到最佳改善,耐磨试验后,涂覆添加4%改性纳米SiO_2的UV固化涂层的PC较涂覆未添加纳米SiO_2的UV固化涂层的PC,透光率降低值从4.5%降至1.1%,雾度增加值从21.29%降至3.41%,PC表面涂层的铅笔硬度达到2H。     

UV固化环氧丙烯酸酯／SiO2杂化涂料的制备与性能研究

以改性硅溶胶为无机组分,双酚A型环氧丙烯酸酯为有机组分,制备了UV同化环氧丙烯酸酯/SiO2杂化涂料.研究了改性硅溶胶制备条件及其用量对杂化涂料机械性能的影响,并用FT-IR和TG对固化膜进行了表征.结果表明改性硅溶胶能够同时提高体系的硬度和柔韧性,当n(MPTMS):n(HCI):n(TEOS)为0.75:0.024:1、改性硅溶胶与环氧丙烯酸酯的质量比为30:70时,涂膜机械性能最佳.TG分析结果表明改性硅溶胶的加入可以明显提高环氧丙烯酸酯的热稳定性.     

高硅含量水性木器涂料的制备与性能

将改性硅溶胶添加到聚丙烯酸酯乳液中制备高硅含量SiO2/聚丙烯酸酯复合乳液(SiO2/PA)。研究了硅溶胶用量对SiO2/PA乳液及涂膜性能的影响,结果发现SiO2/PA复合乳液的SiO2含量高达48%,贮存稳定性好,平均粒径为170～180 nm。随着硅溶胶与聚丙烯酸酯乳液配比的增大,涂膜的耐水性、耐醇性、摆杆硬度和拉伸强度都有所提高。扫描电子显微镜(SEM)测试发现高硅含量涂膜表面平整致密,TGA分析表明SiO2/PA杂合涂膜热稳定性良好。     

SiO2杂化对回收PET基光固化不饱和聚酯性能的影响

以回收的聚对苯二甲酸乙二酯(PET)瓶片为原料,通过化学解聚、酯化、溶胶-凝胶杂化等手段,制备了可UV固化的纳米SiO2杂化不饱和聚酯(UPR),并研究了SiO2溶胶含量对树脂及其固化膜基本性能的影响.结果表明:将反应性SiO2溶胶用于光固化UPR的改性,改性后膜的综合性能得到了较好的提升.当SiO2溶胶添加量为25％...     

PE基聚硅氧烷/改性SiO2超疏水薄膜的构筑

使用十八烷基三甲氧基硅烷(OTMS)对纳米SiO2进行表面疏水改性,将得到的改性纳米SiO2(OTMS-SiO2)添加到有机硅树脂(SI)中,然后采用两步法在聚乙烯(PE)薄膜表面固化制备了复合涂层SI/OTMS-SiO2.通过FTIR、1HNMR、29SiNMR、TGA对OTMS-SiO2及复合涂层进行了表征,采用接触角测量仪、SEM、AFM对复合涂层疏水特性和形貌进行了测试和观察,最后对复合涂层的耐磨性和附着力进行了分析.结果表明,SiO2表面成功引入了OTMS,且OTMS-SiO2均匀附着在硅树脂涂层上,增加了表面粗糙度,得到了PE基固化超疏水复合涂层.当OTMS-SiO2添加量为正己烷质量的8％时,制得的复合涂层的水接触角为154°,滚动角为7°,并具有良好的耐磨性,其附着力可达4A等级.     

水性硅溶胶-有机硅纳米杂化材料在防水砂浆中的应用研究

将几种功能性有机硅烷偶联剂、含氢硅氧烷环状单体和含氢硅油与不同pH值的无机纳米硅溶胶水溶液反应制备出硅系有机-无机纳米杂化复合液和通过溶胶-凝胶法制出有机硅-硅溶胶杂化固体微粉，并用IR和TEM对杂化材料进行表征，研究了杂化复合液的稳定性和杂化复合液与杂化微粉中有机硅种类、杂化比和用量对水泥砂浆凝结硬化的影响和对聚合物改性水泥砂浆的强度和防水性能的影响。结果表明：（1）有机硅-硅溶胶杂化复合液对水泥砂浆有一定的缓凝作用；（2）改性砂浆的28d抗压强度都高于空白水泥砂浆的28d抗压强度，而且改性砂浆具有显著的防水功能：（3）杂化微粉改性水泥砂浆抗压强度接近于空白样，但吸水率较低．具有较佳的防水性能。     

新型氟硅改性环氧丙烯酸超疏水防污涂层研究

采用自由基聚合法,合成了氟硅改性苯乙烯环氧丙烯酸树脂,其中硅以硅溶胶的形式,将无机网络引入到聚合物网络体系中,形成有机-无机杂化材料。通过对涂膜的附着力、耐冲击性、接触角等各项性能的研究,得到合成树脂的最佳配比为:软硬单体比为0.8,含氟单体含量为12%,环氧含量为10%,苯乙烯含量为10%,丙烯酸含量为6%。并且考察了无机硅溶胶对涂膜化学稳定性能的影响、涂层表面氟原子含量以及涂膜与水接触角。通过添加纳米SiO2,制备了具有微纳米阶层型结构的涂层,其与水的接触角可达150°,具有超疏水特性。     

表面凝胶化技术构建粗糙细微结构

在醇溶性氟化聚合物（FR）溶液中,以正硅酸乙酯（TEOS）和甲基三乙氧基硅烷（MTES）为前体,并掺杂聚四氟乙烯（PTFE）,在酸性和水量不足的条件下,得到了均匀的复合溶胶。涂敷后,经表面凝胶化技术处理,使涂层表面得到微米级PTFE粒子和纳米级SiO2粒子相结合的微米纳米阶层结构。XPS证实了凝胶化只在涂层表面发生,SEM观察到涂层表面的形貌与荷叶表面极其相似,该方法可用于制备超疏水性功能涂层材料。     

含—SH基团纳米SiO_2复合材料及其紫外光固化性能的研究

以正硅酸乙酯(TEOS)和γ-巯丙基三甲氧基硅烷(KH-590)为原料,通过溶胶-凝胶法制备了巯基改性纳米SiO_2杂化材料,并对不同比例KH-590改性后的效果用用红外光谱进行了分析表征。将改性前、后的纳米SiO_2添加到光固化涂料中,考察了其对光固化涂料固化速度和机械性能等的影响。结果表明,改性后的纳米SiO_2杂化材料表面含有巯基基团,且巯基的引入提高了光固化涂料C—C双键的转化率。当KH-590的用量为TEOS质量的35%时,纳米SiO_2杂化材料在光固化涂料中分散均匀,涂料的机械性能显著改善。     

金属基表面Al2O3-SiO2涂层耐腐蚀性能的研究

由溶胶完全混合后再制备的Al2O3-SiO2复合涂层在碱性、酸性介质中都表现出更好的耐腐蚀性.     

铝翅片用有机-无机杂化超亲水涂料的制备

以溶胶-凝胶法制得改性SiO2溶胶,然后与丙烯酸(AA)共聚得到有机-无机杂化材料,置换溶剂并调节pH后,制得水性有机-无机杂化超亲水涂料.研究了正硅酸乙酯(TEOS)和偶联剂KH-570的用量及pH对有机-无机杂化超亲水涂料的亲水性及水溶解率的影响.结果发现,当w(TEOS)=70％、pH=7和w (KH-570)=...     

表面改性硅溶胶粒子增强聚甲基硅树脂薄膜材料

以甲基三甲氧基硅烷（MTMS）水解聚合产物作为主要成膜物质,经甲基丙烯酰氧基丙基三甲氧基硅烷（MEMO）表面改性的正硅酸乙酯（TEOS）水解产物硅胶作为无机增强物,利用两者羟基之间的共缩聚反应在聚碳酸酯（PC）板表面制备有机/无机复合透明耐磨薄膜;采用TG/DTA、FTIR、UV-vis、金相显微镜及SEM等测试手段对不同含量MEMO改性硅胶对薄膜结构及性能的影响进行表征.研究结果表明,MTMS和TEOS的水解聚合产物通过共缩聚反应在PC板表面形成带有机基团的无机交联网络结构,基本骨架由Si—O—Si组成;在150～250℃之间,MEMO所带的C=C会发生热引发自由基聚合反应;随MEMO含量的增加,薄膜的柔韧性提高;薄膜对PC板有一定的增透作用,MEMO含量的改变对其增透性能影响不大;薄膜能显著提高PC板的硬度,随着MEMO含量的增加,能制备厚膜而不易开裂.     

SiO_2/聚硅氧烷纳米复合防腐涂层的制备与性能(英文)

以有机改性硅烷甲基三乙氧基硅烷为前驱体,以 SiO2溶胶为纳米相,采用溶胶–凝胶法合成纳米复合溶胶,并通过旋涂法在冷扎钢表面制备防腐涂层。通过电化学阻抗谱、X 射线衍射、扫描电子显微镜、差热分析等考察不同纳米 SiO2 含量对涂层性能和结构的影响。结果表明:随着纳米SiO2 含量增多(SiO2 溶胶质量分数从 0 到 15%),涂层的耐蚀性能先大幅增加(在低频区阻抗达到 107 数量级),但当 SiO2 溶胶含量进一步增加达到 30%时,涂层的耐腐蚀性能恶化,比未添加纳米 SiO2 的涂层更差;涂层的耐热性能则随着 SiO2 含量的增加而提高;太多的纳米 SiO2 造成的相分离是高SiO2 纳米粒子涂层耐腐蚀性能恶化的主要原因。     

MEMO改性硅溶胶增强甲基硅树脂薄膜结构及性能

以甲基三甲氧基硅烷(MTMS)水解聚合产物作为成膜材料,甲基丙烯酰氧基丙基三甲氧基硅烷(MEMO)改性硅溶胶为无机增强剂,采用溶胶-凝胶法在聚碳酸酯(PC)表面制备透明硅溶胶增强甲基硅树脂薄膜;探讨了MEMO改性硅溶胶前后涂膜液的稳定特征及薄膜特性,采用envelope方法计算了薄膜厚度。研究结果表明,MEMO改性硅溶胶增强硅树脂涂膜液与未经MEMO改性的涂膜液相比,凝胶时间延长,稳定性提高,易制备厚膜而不开裂;薄膜对PC片有增透作用,MEMO改性对薄膜增透性能及硬度影响不大;薄膜厚度随着陈化时间的延长而增加,理论计算所得的膜厚与SEM实测结果相近。     

Incorporation of silica network and modified graphene oxide into epoxy resin for improving thermal and anticorrosion properties

In this study, the silica network and functionalized graphene oxide (GO) were incorporated into the epoxy coating systems, which was aimed to improve the thermal property and corrosion resistance of epoxy coatings. First, tetraethyl orthosilicate (TEOS) oligomers and epoxy hybrid was fabricated through sol–gel method. Then the (3-aminopropyl) triethoxysilane (APTES) modified graphene oxide (FGO) was added into the epoxy hybrid composite to obtain anticorrosion coatings. Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectrum, and X-ray photoelectron spectrum were conducted to evaluate the structural information of GO and APTES modified GO nanosheets. The results indicated that the APTES successfully grafted onto the surface of GO sheets. Besides, TGA curves, electrochemical measurements and salt spray test were also carried out to characterize the thermal performance and corrosion resistance of GO based epoxy coatings. The TGA results revealed that the thermal performance of epoxy coating containing silica network and FGO nanofiller (ES/FGO) was significantly strengthened compared to pure epoxy. The initial degradation temperature of epoxy coating was increased from 300 to 343.7°C after incorporation of silica component and FGO. The EIS measurements demonstrated that the impedance modulus of ES/FGO was significantly higher than neat epoxy, which indicated that the corrosion resistance of epoxy was substantially strengthened after introduction of silica component and FGO. The corrosion rate and inhibition efficiency of epoxy composite coatings were also shifted from 1.237 × 10⁻⁷ mm/year and 76.6% (for neat epoxy) to 1.870 × 10⁻⁹ mm/year and 99.6% (for ES/FGO), respectively. The salt spray test also revealed that the silica and FGO can improve the corrosion resistance of epoxy coating. Additionally, the dispersion of GO sheets was also enhanced after the modification of APTES siloxane.     

溶胶-凝胶法制备PVA/SiO2杂化材料及性能表征

以正硅酸乙酯（TEOS）和聚乙烯醇（PVA）为原料，采用溶胶-凝胶法制备PVA／SiO2杂化材料，研究丁其制尊T艺和作为玻璃板防雾涂层的应用；通过FT—IR分析证明SO-O-Si的生成及-OH键的保留，使用分光光度计研究其透光率，并对不同质量分数（SiO2）下的雾度、硬度和耐水性进行了讨论。     

The preparation and characterization of abrasion-resistant coatings on polycarbonate

A series of abrasion-resistant coatings based on methyltrimethoxysilane (MTMS), tetraethoxysilane (TEOS), and methacyloxypropyltrimethoxysilane (MEMO) were synthesized via a sol–gel method and applied to polycarbonate (PC) substrate. Through a comparison with an uncoated PC substrate, hardness, adhesion, and abrasion resistance of coated PC substrates were investigated. Fourier transform infrared (FTIR) spectra of these coatings before and after being cured indicated that the crosslinked structure of Si–O–Si was formed via the hydrolysis–condensation reactions of alkoxy silane. The optical test results showed that coated PC substrates possessed higher transmittance and lower haze than uncoated PC substrates. The hardness and adhesion data demonstrated that PC substrates coated with the hybrid coatings (MTMS/TEOS/MEMO coatings) possessed the greatest hardness and optimal adhesion. After 500 wear cycles, the PC substrate with MTMS/TEOS/MEMO coatings showed some grooves and wear tracks without any spallation or delamination, and there was a decrease of only 1.0–1.3% in transmittance and an increase of only 5.68–7.44% in haze. Whereas uncoated PC substrate and substrates with MTMS and MTMS/TEOS (molar ratio is 1.5:1) coatings exhibited a decrease of 3.3, 3.9, and 2.4% in transmittance and an increase of 30.19, 17.42, and 12.35% in haze, respectively.     

Fabrication and characterization of composite sol-gel coatings on porous ceramic substrate

Highly porous ceramic materials were coated using a composite sol-gel method. Alumina powder is dispersed in a silica sol-gel solution and then dip-coated on the substrate. The resulting coatings present a composite microstructure in which crystalline alumina grains are linked to each other by an amorphous silica phase. In this work, we show that, by accurately controlling the sol-gel parameters (water, solvent and silica precursor (TEOS) ratio, pH and ageing time of the sol) and also the powder grain size distribution it is possible to obtain crack-free thick films (more than 20 μm in one step). These coatings present good adherence to the substrate, decrease the roughness and also close the surface porosity of the substrate. Coating mechanical properties have been evaluated thanks to micro-indentation measurements and linked to coating structural evolution with the thermal treatment temperature.