硅丙乳液改性高模数硅酸钾水性无机富锌涂料的研究

以硅溶胶、氢氧化钾为主要原料,硅丙乳液为改性剂,制备了一种稳定的高模数硅酸钾有机-无机复合基料,与锌粉以1∶2比例配制高模数硅酸钾水性无机富锌涂料.探讨了模数、固含量、反应时间、硅丙乳液用量对高模数硅酸钾溶液贮存稳定性和涂料性能的影响.采用正交实验的方法,确定了涂料的最优工艺条件.制备的水性无机富锌涂料是一种经济实用的绿色涂料.     

硅溶胶与硅酸钾(钠)混合物体系单组分涂料的稳定性

研究了作为单组分涂料基料的硅溶胶与硅酸钾(钠)混合物的室温贮存稳定性,并用等温热导微量热法和粒径测量作了表征。结果表明,含小的纳米胶体二氧化硅粒子的混合物稳定性好,稳定性受硅酸钾(钠)模数、硅溶胶在混合物中占的质量分数、混合操作条件和原材料规格等因素影响。加了适当稳定剂的该混合物稳定贮存时间大大延长。最后再加入苯丙乳液配制成的基料在室温下可贮存至少7个月以上。     

纳米二氧化硅改性聚醋酸乙烯乳液的研究

以纳米级无机二氧化硅溶胶改性聚醋酸乙烯乳液,采用预乳化乳液聚合工艺制备了二氧化硅/聚醋酸乙烯复合乳液。研究了加入无机二氧化硅后对乳液的物理性能以及涂膜的物理性能、力学性能和热性能等的影响。结果表明:加入二氧化硅溶胶后复合乳液涂膜的硬度、最大载荷、抗拉强度、耐热性和耐水性均有明显的提高,但是断裂伸长率下降,蓝相时间延长;加入反应性乳化剂后复合乳液分散性和稳定性得到提高,能够获得综合性能良好的复合乳液。     

二氧化硅形态对有机-无机复合弹性乳液涂膜性能的影响

采用预乳化、半连续种子乳液聚合法为聚合工艺,利用无机二氧化硅改性纯丙烯酸酯弹性乳液,使之兼有有机相和无机相的优点,制备有机-无机复合弹性乳液。分别选用3种不同形态的二氧化硅(纳米二氧化硅粉体、硅溶胶、正硅酸乙酯和A-151)进行对比试验,考察了二氧化硅形态对聚合物膜力学性能、吸水率、光学性能、耐热性等性能的影响。结果表明:二氧化硅形态对有机-无机复合弹性乳液涂膜性能有较大影响,二氧化硅以正硅酸乙酯和A-151的加入方式为最佳。     

有机-无机杂化对无机富锌涂料性能的影响

以硅酸钾溶液与硅溶胶为原料,制备了不同模数的硅酸钾溶液,采用四甲基氢氧化铵对硅丙乳液进行催化水解,用适度水解的硅丙乳液对硅酸钾溶液与硅溶胶的反应物进行改性,制得涂料基料,通过有机-无机杂化的方式将涂料基料与锌粉按质量比1.0∶2.6进行混合,制备了一种水性无机硅酸钾富锌涂料。考察了硅酸钾溶液模数、硅酸钾溶液固含量、适度水解的硅丙乳液掺量等对水性无机富锌涂料性能的影响,并对相关作用机理进行了分析。结果表明:当硅酸钾模数为3.3,硅酸钾溶液固含量为25.0%,适度水解的硅丙乳液的添加量为硅酸钾溶液固含量的5%~10%时,涂膜的硬度为5H,柔韧性为4 mm,附着力为1级,7 d耐水性和耐人工海水性能较好,所配制涂料的综合性能优异。     

有机-无机杂化对无机富锌涂料的性能影响研究

以硅酸钾溶液与硅溶胶的反应物为基料,选用四甲基氢氧化铵对硅丙乳液进行催化水解,并以适度水解的硅丙乳液改性硅酸钾溶液与硅溶胶基料,通过有机-无机杂化的方式将其与1:2.6的锌粉进行混合,制备了一种水性无机硅酸钾富锌涂料。考察了模数、固含量、经适度水解的硅丙乳液掺量等对水性无机富锌涂料性能的影响,并对相关作用机理进行了分析。结果表明：当硅酸钾模数 为3.3,硅酸钾溶液固含量为25.0%,经适度水解的硅丙乳液的添加量为硅酸钾溶液固含量的5%～10%时,涂膜的硬度为5H,柔韧性为4mm,附着力为1级,7d耐水性和耐人工海水性能较好,所配制涂料的综合性能最优。     

增稠剂在水性无机建筑涂料中的应用

以无机纳米复合材料(胶体二氧化硅分散液)为主要成膜物质,以金红石型钛白粉、高岭土、滑石粉为颜填料制备了一种水性无机建筑涂料,讨论了各类水性增稠剂的增稠效果,及其对涂层的阻燃性、耐擦洗性、耐水性等的影响。确定以合成硅酸镁锂为体系的增稠剂,讨论了其添加量对涂料黏度、施工性及贮存稳定性的影响。     

影响无机建筑涂料增稠胶化的原因分析

以硅酸钾体系无机涂料为例,分析水性无机建筑涂料增稠胶化原因,主要从颜填料、硅酸钾、乳胶等方面进行分析,通过实验验证,得出如何选择原料使体系稳定性最佳。     

复合外墙涂料的耐候性和耐沾污性研究

以改性纳米硅溶胶和苯丙乳液为基料辅以合适的颜填料和助剂制作成的有机无机复合外墙涂料性能优异。着重讨论了不同PVC涂料如何搭配改性纳米硅溶胶才能取得突出的耐候性和优异的耐沾污性。     

KH 560对无机涂料热贮存稳定性的影响

以硅溶胶、硅酸钾、季铵盐、γ-(2,3-环氧丙氧)丙基三甲氧基硅烷(KH 560)等为原料制备无机涂料，探讨了KH 560对无机涂料热贮存稳定性的影响。结果表明，KH 560在无机涂料体系中与季铵盐稳定剂具有协同增效作用，能够显著提高无机涂料的热贮存稳定性。     

有机-无机(硅溶胶)复合涂料的制备

有机-无机(硅溶胶)复合涂料，既具有硅溶胶耐候性好、硬度高、附着力强、耐水、耐碱、耐沾污等特点，又具有有机聚合物成膜性好、韧性大、光泽高等特点。本法选用江阴国联化工有限公司生产的交联改性的苯乙烯-丙烯酸酯乳液与硅溶胶通过物理混拼法，并辅以适当的颜填料、助剂制备的涂料，可作为外墙封闭型底漆用于水泥砂浆、混凝土等硅酸盐基材及用于外墙装饰。文章还述及制备工艺及注意事项。     

无机硅溶胶外墙涂料的研制

针对目前硅溶胶外墙涂料稳定性差的缺点,将硅溶胶与有机乳液进行复配,通过选用乳液及pH值稳定剂,制得稳定性好的无机硅溶胶外墙涂料。试验结果显示,该涂料热贮存稳定性好,兼具无机涂料和有机涂料的特性,其耐沾污性和耐候性比普通外墙乳胶涂料有所提高。     

无机-有机复合型外墙涂料的制备

该涂料以无机系硅溶胶为主 ,有机高分子乳液为辅 ,二者共混改性 ,既具备了无机涂料和有机涂料的特性 ,又弥补了二者的不足 ,是最有前途的环保型高档建筑外墙涂料。介绍了最佳共混条件的优化选择 ,以及颜填料助剂的选用对涂料性能的影响     

灰色弹性隔热阻燃外墙涂料的研制

以纯丙弹性乳液与改性硅溶胶复配为基料,以特种功能型热反射粉、改性聚磷酸铵为功能填料,以钛白粉和自配黑为颜料,在矿物填料和助剂的配合下,制备的灰色弹性外墙涂料,经检测其涂膜具有优异的热反射隔热性、耐火阻燃性、耐候耐水性、耐沾污性等特点。     

水性无机富锌涂料的研制

以低模数的硅酸钾溶液和硅溶胶为原料,制备成稳定性良好的高模数硅酸钾溶液。讨论了温度、硅烷偶联剂种类和搅拌速度等因素对制备高模数硅酸钾溶液的影响。比较了研制的水性无机富锌涂料和国内外同类产品的性能。介绍了水性无机富锌涂料的施工工艺。     

醇溶性无机富锌涂料的研制

醇溶性无机富锌涂料是以硅酸乙酯水解液为A组分,聚乙烯醇缩丁醛为B组分基料,配以锌粉以及其他填料、助刺、溶剂等制成。简要阐述了醇溶性富锌涂料成膜机理和对硅酸乙酯水解配方的研究,以及锌粉添加量对防腐性能的影响。     

Study of the effect of the concentration,size and surface chemistry of zirconia and silica nanoparticle fillers within an epoxy resin on the bulk properties of the resulting nanocomposites

Epoxy resin nanocomposites were prepared by curing bisphenol‐F with an aliphatic amine in the presence of SiO₂ and ZrO₂ nanoparticles as inorganic fillers. Both types of particles were prepared with diameters of around 10 nm and 70 nm to study size effects in the nanocomposites. The nanoparticles showed a different constitution: while silica was amorphous and spherical in nature, zirconia was crystalline and non‐spherical. Both nanoparticles were surface‐functionalized with novel diethylene‐glycol‐based capping agents to increase the compatibility with the epoxy matrix. The organic functionalities were attached to the nanoparticle surface via phosphonic acid (zirconia) and trialkoxysilane (silica) anchor groups. The homogeneity of the distribution of surface‐modified inorganic nano‐sized fillers in the matrix up to 5.8 vol% in case of silica and 2.34 vol% in case of zirconia was determined by small‐angle X‐ray scattering and transmission electron microscopy. Mechanical properties such as hardness and storage modulus were increased with increasing filler content while thermal stability of the obtained materials was nearly unaffected after incorporation of nanoparticles. Copyright © 2011 Society of Chemical Industry     

A New Approach to Improved Properties of Rubber Vulcanizates Containing White Molybdates

Incorporation of fillers in rubber results in a profound effect on rheological and mechanical properties of the formed composites. Fillers are customarily classified into organic and inorganic. The latter class includes calcium carbonate, talc, barium sulfate, kaolin, silica, etc. Molybdates are inorganic, nontoxic white pigments combined with reasonable pricing range and controlled solubility. The purpose of this study was to employ white molybdates and study their role as reinforcing fillers that can replace traditional carbon black, or semi-reinforcing furnance black (SRF), with both natural rubber (NR) and a blend of natural rubber-styrene butadiene rubber (NR-SBR), to show the modification of rheometric characteristics, tensile strength, strain at break, hardness, Young's modulus, swelling in toluene, thermal oxidative aging, and calculation of the rubber-filler interaction after the addition of such fillers.     

Chloride-free biodegradable organic acid hydrolyzed zinc silicate coating

Partially hydrolyzed ethyl silicate has widely been used as a binder to formulate inorganic zinc silicate paint for anticorrosive coating applications. Hydrochloric acid is used most popularly to catalyze the hydrolysis of ethyl silicate. Although different acids have been tried as catalysts for ethyl silicate hydrolysis, no attempt has been made to make stable paints out of those hydrolyzed silicate binders. In this study, environment benign biodegradable organic acids such as oxalic acid, citric acid, lactic acid and acetic acid were used for the hydrolysis of ethyl silicate and compared with the hydrolysis using conventional hydrochloric acid. The hydrolyzed silicate sols were pigmented further with silica powder and evaluated for their stability. Of the various organic acids catalyst used, only oxalic acid catalyzed sol acted as a stable binder system. The pigmented binder was then mixed with metallic zinc to formulate anticorrosive inorganic zinc silicate paint. The resultant coatings were characterized for various physical, surface, mechanical and chemical resistance properties such as drying, hardness, adhesion (cross hatch) and solvent resistance. Corrosion resistance properties were analyzed by means of salt spray, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The results revealed that the physical, mechanical, chemical and anticorrosive properties of the coating hydrolyzed with hydrochloric acid and oxalic acid are comparable. Thus, a chloride free biodegradable organic acid hydrolyzed inorganic zinc silicate primer is reported and due to its long term stability same also can be scaled up commercially.