一种高耐温性二氧化钛颜料的制备方法

本发明公开了一种高耐温性二氧化钛颜料的制备方法，包括用蒸馏水或去离子水将二氧化钛初品配成浆料；用碱溶液调浆料的pH值为8～11；加分散剂后砂磨过滤；将过滤后的浆料加热至温度50℃～75℃并在包膜的全过程中维持该温度不变；滴加硅酸钠水溶液，加入酸溶液使浆料中的pH为8～11并保持该pH值不变；加酸溶液，调节pH值至2～7，熟化；滴加铝盐水溶液，并流酸溶液或碱溶液以保持pH值不变，滴完后均匀搅拌；加入碱溶液，调pH至6～8，搅拌后过滤、洗涤、干燥、进行气流粉碎和有机处理。本发明制备的二氧化钛颜料具有高耐温性、较好的白度与分散性。本发明方法可控性好，操作性强，能耗低，易于工业化生产

一种复合包膜二氧化钛颜料的制备方法

本发明公开了一种复合包膜二氧化钛颜料的制备方法，该制备方法采用磷的水溶性化合物和无机酸或无机碱作为共同的沉淀剂，与含铝、锆、铈、锌、镁或锡的水溶性盐同时加入分散的二氧化钛初品中，在二氧化钛初品表面涂覆上一层包含磷酸盐化合物和难溶氢氧化物的混合涂覆层。由该方法制备的颜料具有很高的耐晒性，并具有优良的遮盖力，油性白度，可以用涂料、塑料、造纸中

一种高耐光性二氧化钛颜料的制备方法

本发明公开了一种高耐光性二氧化钛颜料的制备方法，步骤包括：制备二氧化钛初品的水悬浮液；在二氧化钛颜料上沉积一层致密的二氧化硅包覆层；在包覆二氧化硅的二氧化钛颜料上沉积磷酸铝化合物；在包覆二氧化硅和磷酸铝的二氧化钛颜料上，使用并流的方法沉积氢氧化铝；氢氧化铝包膜后，搅拌熟化，经过滤、洗涤、干燥、气流粉碎和有机处理，得到高耐光性二氧化钛颜料。本发明方法具有可控性好、重现性好、可操作性强等优点，易于工业化生产，具有较好的应用前景。通过该方法制备的二氧化钛颜料具有高耐光性、高耐晒性、高不透明性和高抗色变性等优点，可以用在装饰纸、层压纸和对耐晒性有较高要求的涂料和塑料制品中

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies