反射隔热涂料细度与性能的关系研究

分别采用不同来源的钛白颜料来制备反射隔热涂料,考察涂料分散时间与浆料细度及最终涂膜性能的关系。结果表明:相比TR TiO2颜料涂膜,XJ TiO2颜料涂膜的对比率、拉伸强度、断裂延伸率和耐洗刷性在涂料被分散研磨40～60 min后得到较大的提升。然而,涂料的隔热性能受颜料种类和颗粒细度的影响较小。     

碳酸钙产品的用途和市场前景

碳酸钙产品的主要用途橡胶行业:碳酸钙是橡胶工业中使用量最大大填充剂之一。碳酸钙大量填充在橡胶之中,可增加其制品的容积,并节约昂贵的天然橡胶,从而大大降低成本。碳酸钙填入橡胶中,能获得比纯橡胶硫化物更高的抗张强度、撕裂强度和耐磨性。塑料行业:碳酸钙在塑料制品中能起到一种骨架作用,对塑料制品尺寸的稳定性有很大作用,还能提高制品的硬度,并提高制品的表面光泽和表面平整性。由于碳酸钙白度在90%以上,还取代昂贵的白色颜料。油漆行业:碳酸钙在油漆行业中的用量也较大,是如在稠漆中用量为30%以上。水性涂料行业:碳酸钙在水性涂料行业的用途更为广泛,能使涂料不沉降,易分散,光泽好等特性,在水性涂料用量为20～60%。另外,碳酸钙在造纸工业的重要作用,能保证纸张的强度和白度,且成本较低。在电缆行业产品中,能起一定的绝缘作用。碳酸钙的市场前景据有关资料分析,到2010年,我国的碳酸钙市场需求量为:塑料工业:重质碳酸钙的需求量预计将达到22万吨。造纸工业:将需要超细重质碳酸钙60万吨左右。橡胶工业:总需求量将达到20万吨左右。油漆涂料:需超细重质碳酸钙6万吨左右。胶粘剂和密封剂:将消耗碳酸钙55万吨左右,超细活性重质碳酸钙的用量将达...     

入烧原料细度对煅烧高岭土物化性能的影响研究

研究了入烧原料细度对煤系煅烧高岭土白度、吸油率、松容重、遮盖率 (光散射系数 )及活性 (活性Al2 O3)等物理化学性能的影响。结果表明 ,入烧原料细度对煤系煅烧高岭土的物化性能有显著影响 ,减少入料粒度可以不同程度地提高产品的白度、吸油率、活性Al2 O3及遮盖率     

轻质碳酸钙市场前景广阔

橡胶行业:碳酸钙是橡胶工业中使用最早量最大大填充剂之一,碳酸钙大量填充在橡胶之中,可以增加制品的容积,从而节约昂贵的天然橡胶达到降低成本的目的,碳酸钙填入橡胶能获得比纯橡胶硫化物更高的抗张强度耐磨性,撕裂强度,并在天然橡胶和合成橡胶中有显著的补强作用,同时可以调整稠度。塑料行业:碳酸钙在塑料制品中能起到一种骨架作用,对塑料制品尺寸的稳定性有很大作用,能提高制品的硬度,还可以提高制品的表面光泽和表面平整性。在一般塑料制品中添加碳酸钙耐热性可以提高,由于碳酸钙白度在90%以上,还可以取代昂贵的白色颜料起到一定的增白作用。油漆行业:碳酸钙在油漆行业中的用量较大,是不可缺少的骨架,在稠漆中用量为30%以上,酚醛磁漆4%～7%里酚醛细花纹皱纹漆39%以上。水性涂料行业:在水性涂料行业的应用,用途更为广泛,能使涂料不沉降,易分散,光泽好等特性,在水性涂料用量为20%～60%。另外,碳酸钙在造纸工业起重要作用能保证纸的强度,白度,成本较低。在电缆行业能起一定的绝缘作用。轻质碳酸钙市场未来前景塑料工业:塑料制品是重质碳酸钙最大的消费领域。根据塑料工业“十五”计划和2015年规划,我国塑料制品的产量在2006～2015年之间的...     

纳米材料和技术在新型建筑材料中的应用

一、纳米技术在建筑涂料中的应用 涂料是建筑物的内衣（内墙涂料）和外衣（外墙涂料）,国内传统的涂料普遍存在悬浮稳定性差、不耐老化、耐洗刷性差、光洁度不高等缺陷。纳米复合涂料就是将纳米粉体用于涂料中所得到的一类具有耐老化、抗辐射、剥离强度高或具有某些特殊功能的涂料,在建材（特别是建筑涂料）方面的应用已经显示出了它的独特魅力。     

氯醚防腐蚀涂料的研制及其性能

为了改善传统防腐蚀涂料的性能,自制氯醚树脂并以其为基料,以复合铁钛防锈颜料和云母氧化铁为颜填料制备了氯醚防腐蚀涂料,优化了颜基比、颜填料细度、助剂添加量,并考察了优化条件下制备的涂料的性能。结果表明：随着颜基比的增大,涂层力学性能下降,防腐蚀性能先升高后下降,颜基比为2．00～2．50时涂层的防腐蚀性能最佳;颜填料细度...     

内墙纳米保温涂料的研制与性能研究

通过引入纳米材料来提高墙体涂料的保温性能，以不同的硅酸盐纳米材料、碳酸盐纳米材料为主要材料，通过配方及工艺的优化开发出了内墙纳米保温涂料。对所得保温涂料进行了性能袁征，如涂料的结构、微观形貌、耐洗刷性能、导热系数、施工性、干燥时间、稳定性、耐水性、耐碱性等。     

高厚膜固化涂料

本涂料是含有环氧树脂、颜料、非水性稀释剂的固化涂料,主要是在上述颜料中混入了为固 体成分的15～30％重量的粉粒状水交联聚烯烃形成了高厚膜固化涂料。     

耐洗刷性建筑乳胶涂料的研究进展及其耐磨机理

主要介绍了建筑内墙用耐洗刷性乳胶涂料的研究进展及其耐磨机理。首先,从摩擦学的角度分析了涂膜洗刷过程中的磨损机理。其次,介绍了与耐洗刷性相关的性能,主要包括涂膜致密性、附着力、粘弹性、硬度和耐磨性等,由此得到耐洗刷性的影响因素,主要包括乳胶涂料所用乳液种类、玻璃化温度、粒径的性质的影响,颜填料的种类及耐磨机理、添加量、形状及大小、表面性质等性质的影响,助剂的性质的影响以及成膜干燥工艺的影响等。然后,介绍了耐洗刷性内墙乳胶涂料的研究进展,主要包括有机无机杂化型涂料、无机填料表面改性、核壳结构乳液的合成、有机硅改性丙烯酸乳液和特殊单体改性等。最后,对未来提高内墙乳胶涂料耐洗刷性能的研究方向进行了展望。     

钛白粉在塑料中的应用

钛白粉是一种重要的白色颜料,跟传统的铅白、锌白、锌钡白等白色颜料相比,钛白粉具有折射率高、消色力强、遮盖力大、分散性好、白度好、无毒等多种优异性能,被称为白色颜料之王,广泛应用在涂料、塑料、油墨、造纸、化纤、陶瓷等行业。其中塑料行业是钛白粉的第二大应用行业,占20%左右。     

新型保温隔热外墙涂料的研制

以碳酸钙、金红石型二氧化钛、空心玻璃微珠、氧化锌为颜填料,以苯丙乳液为主成膜物,制备出的建筑外墙保温隔热涂料,其常规性能符合外墙涂料的相关标准要求。研究了添加碳酸钙、金红石型二氧化钛和氧化锌三种填料及复合添加四种填料对涂层隔热性能的影响。结果表明：添加碳酸钙、金红石型二氧化钛和氧化锌可提高涂层隔热性能;复合掺入碳酸钙、金红石型二氧化钛、氧化锌和空心玻璃微珠可进一步提高涂层隔热性能。掺加15％碳酸钙、7％金红石型二氧化钛、5％氧化锌和8％空心玻璃微珠时,隔热温差为7．9℃,导热系数为0．0767W／（m·K）,具有明显的保温隔热效果。     

Production of Submicron Particles by Mechanical Treatment: Width of Particle Size Distribution and Fineness of Product

Calcium carbonate (CaCO₃) powders commonly used as a functional filler in paints, inks, papers, plastics, cosmetics, and so on, are generally produced by mechanical treatment (milling). This research was aimed to produce calcium carbonate submicron particles by stirred milling in wet conditions. The experiments were carried out by a batch operation, and determined the change in particle size distribution (PSD) of calcium carbonate. The product size (fineness) and PSD were used in the evaluation of the test results. The results showed that wet grinding in a stirred bead mill using the smaller grinding media (500 µm) is an effective method for reduction of product size (～500 nm) of the CaCO₃ powder.     

不同形貌碳酸钙颜料粒子的制备及在喷墨印刷中的应用

目的研究碳酸钙颜料粒子的形貌对喷墨打印涂层性能的影响。方法通过改变分散剂的种类制备不同的碳酸钙颜料粒子,并通过扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)、粒径分析仪对制备的颜料粒子进行表征,研究分散剂种类对颜料形貌和粒径的影响。将4种不同形貌的碳酸钙分别作为颜料,将其应用于喷墨打印纸的表面涂层,并测试涂布纸张的动态渗透性、物理性能、喷墨打印性能。结果 CMC作为分散剂有助于形成粒径分布均匀的球形碳酸钙颜料粒子;纺锤形碳酸钙颜料粒子有助于提高涂布纸的平滑度和光泽度;球状体碳酸钙颜料粒子有助于改善涂布纸的喷墨印刷性能和渗透性;颜料粒子的粒径分布均匀性对涂布纸的动态渗透性影响较大,其影响超过颜料粒子形貌对涂布纸渗透性的影响。结论粒径分布均匀的球状体碳酸钙颜料粒子最适合用于喷墨印刷涂层,可以提高纸张的物理性能、印刷性能和动态渗透性能。     

表面改性剂对碳酸钙基复合白色颜料性能影响研究

本文通过活化一复合两步法制备碳酸钙基复合白色颜料粉体。研究了不同表面改性剂对颜料性能的影响,并且测试了复合粉体的遮盖力、吸油值、白度等性能及微观形貌。结果表明选取三乙醇胺为改性剂时,复合粉体的综合性能最佳,其中遮盖力为19．5g／m2,吸油值24．2g／100g,白度95．8％。     

Morphology of calcium carbonate coating on amorphous silicate powder

The amorphous silicate powders containing sodium, calcium,barium and magnesium were prepared by sol-gel and ion-exchangemethod, and calcium carbonate was coated on the powders for thepurpose of industrial re-circulation of calcium carbonate. Thecalcium carbonate powder with micro pores was obtained bycoating on amorphous CaO-SiO₂ powder, and the pore sizedistribution would be influenced by calcium on the surface ofthe powder. The coating on amorphous MgO-SiO₂ powderresulted in a hedgehog-like powder, which allowed needle-likecrystal extended radially, and the coated powder was the mixedphase of aragonite and calcite. The use of amorphousBaO-SiO₂ and Na₂O-SiO₂ powders also led to the coatingpowder with the single phase of calcite. The morphology ofcalcium carbonate coating would be ascribed to cations on thesurface of the amorphous silicate powders, because the amount ofcations that would be dissolved in soaking solution was smalland insufficient to affect the morphology.     

矿物颗粒表面纳米化修饰及其在PP复合材料中的应用

通过化学方法成功地实现了矿物粉体在Ca (OH)₂-H₂O-CO₂ 体系中的表面纳米化修饰, 即在微米级重质碳酸钙、硅灰石粉体表面形核生成粒径均匀的纳米碳酸钙颗粒层。研究表明, 表面纳米化修饰后的矿物粉体表面的粗糙度大大增加, 尖锐的棱角得以钝化, 纳米化修饰后矿物粉体比表面积比原来提高至少200 %以上。将经表面纳米化修饰后的硅灰石粉体在聚丙烯(PP) 中填充应用, 较未经表面纳米化修饰的硅灰石粉体填料, 其抗冲击强度提高65 %以上, 延伸率提高200 %以上。     

贝壳资源的深加工利用

以牡蛎壳为原料,对其物相组成、结构等进行分析,然后将牡蛎壳进行煅烧,考察煅烧工艺对于产物氧化钙的活性、有效钙含量、白度以及微观结构等性能的影响,最后将煅烧产物进行消化和碳化,制备纳米碳酸钙.研究结果表明,牡蛎壳中碳酸钙为方解石晶型,含量高达95.87％,是一种优质的海洋生物碳酸钙资源.牡蛎壳煅烧过程中,随着煅烧温度的提...     

An electrodeposition method of calcium phosphate coatings on titanium alloy

Calcium phosphates coatings were deposited onto titanium alloy discs via en electrodeposition method. Titanium alloy discs were blasted with calcium phosphate particles, then etched in a mixture of nitric and fluoric acids and rinsed in demineralized water. The titanium alloy disc (cathode) and platinum mesh (anode) were immersed in a supersaturated calcium phosphate electrolyte buffered at pH 7.4 and connected to a current generator. The microstructure, chemical composition and crystallinity of the electrodeposited coatings were studied as function of time 10–120 min, temperature 25–80°C, current density 8–120 mA/cm², magnesium and hydrogen carbonate amounts (0.1–1 mM). Uniform calcium phosphate coatings were obtained in 30 min but coating thickness increased with deposition time. Raising the temperature of electrolyte resulted in more uniform coatings as ionic mobility increased. Low current density was preferable due to hydrogen gas evolving at the cathode, which disturbed the deposition of calcium phosphate crystals on titanium. The amounts of magnesium and hydrogen carbonate ions affected both the homogeneity and morphology of the coatings. This study showed that the electrodeposition method is efficient for coating titanium with osteoconductive calcium phosphate layers.     

Effect of polymeric thickeners on pigment coatings: Adsorption, rheological behaviour and surface structures

Polymeric thickeners play a vital role in controlling water retention in paper coating processes. In this work, the interactions between various polymer water retention agents (i.e., thickeners) and coating pigments were investigated, in an attempt to improve the understanding of the thickening mechanisms. Adsorption isotherms of the polymeric thickeners, up to four types of commercial thickeners based mainly on copolymers of acrylate and acrylic acid, onto mineral pigments (clay pigment and ground calcium carbonate, GCC) were determined. It was found that the adsorption behaviour was strongly affected by the surface structure of the pigment. All the selected thickeners showed greater affinity towards clay pigment than calcium carbonate. The influence of the selected thickeners on coating mixtures behaviour at low shear rate was also investigated. In coating mixture based on clay, it was found that HASE (hydrophobically modified alkali swellable emulsion) thickener that has the highest adsorption led to more effective thickening. All the selected thickeners showed moderate effect on the viscosity of the coating mixture based on GCC. The presence of thickeners also produced the coated paper with smooth and homogeneous surfaces, revealed by SEM observation.