CN114656806A - 一种二氧化钛表面包覆的方法 - Google Patents
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- 239000011248 coating agent Substances 0.000 title claims abstract description 52
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 150000007522 mineralic acids Chemical class 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 235000010215 titanium dioxide Nutrition 0.000 abstract description 25
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- 231100000252 nontoxic Toxicity 0.000 description 1
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Abstract
本发明属于钛白粉加工技术领域,具体涉及一种二氧化钛表面包覆的方法;技术方案包括:步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统;步骤B:超声10~20min后,调整浆料温度为60~90℃,包膜的过程中PH值维持中性,将超声频率调整至30kHz全功率输出,持续10~20min,然后在温度不上升的情况下,将超声功率逐步下调至50%的功率输出,持续15~120min,直到料浆完成包膜;步骤C:打开排料阀,将包膜好的浆料排放到洗涤罐中,洗涤干燥后即得到钛白粉成品;其目的在于,提高钛白基料的分散性,减少包膜剂自成核现象,减少包膜剂的晶粒度,提高膜层的致密度,提高包膜剂的利用率,提高包膜速率,减少水洗量。
Description
技术领域
本发明属于钛白粉加工技术领域,具体涉及一种二氧化钛表面包覆的方法。
背景技术
钛白粉,化学名称:二氧化钛(TiO2),是一种对人体无毒无害的多晶型化合物,也是目前世界上最佳的白色颜料,不但物理化学性质十分稳定,还具有高折射率、最佳的遮盖力、最佳白度和对紫外线的吸收能力等优良的光学、电学性能,广泛应用于涂料、塑料、造纸、油墨、电子等领域,有很高的商业价值。
但是钛白粉的基料本身易团聚,分散性较差,不利于在各种体系中运用,必须进行后处理包覆后,才是市场上可以接受的白色颜料,根据不同的应用领域,采用不同的包覆方案。目前钛白粉的后处理包膜方案多采用可溶性盐,通过调节pH值使离子处于过饱和状态,自由的沉积在钛白粉基料的表面,形成包覆层。此种工艺常出现自成核、多颗粒团聚包覆,膜层晶粒较大不致密,且包膜剂的利用率低,需要大量的水洗,同时包膜及陈化时间较长,效率低下。
发明内容
为了解决上述现有技术存在的缺陷,本发明的目的在于提供一种新的二氧化钛表面包覆工艺,可以钛白基料在良好分散的情况下,实现单颗粒致密均匀包覆。
本发明采用的技术方案如下:
一种二氧化钛表面包覆的方法,包括如下步骤:
步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统,超声功率调整为0.1~100KW,调整超声频率为25KHz~2.5GHz;
步骤B:超声10~20min后,调整浆料温度为60~90℃,调整pH值为中性并在包膜的过程中维持中性,将超声频率调整至30kHz全功率输出,持续10~20min,然后在温度不上升的情况下,将超声功率逐步下调全功率的50%,持续15~120min,直到料浆完成包膜;
步骤C:打开排料阀,将包膜好的浆料排放到洗涤罐中,将浆料洗涤至中性后,经干燥粉碎后即得到钛白粉成品。
采用上述技术方案,砂磨后浆料通过超声分散,维持基料的分散性的同时降低浆料粘度,从而提高浆料的传质效率,将浆料调到合适的pH值及合适的温度下,将包膜剂加入到浆料中,包膜剂开始在基料颗粒表面沉积,在超声作用下,沉积的晶体经过二次成核效应,晶核数量增加,晶体体积缩小,使膜层由大量的小颗粒的晶体组成,膜层致密度得到提高,同时膜层均匀的包覆到每个分散良好的钛白基料颗粒上,使颗粒的膜层均匀完整。同时在超声营造的高温高压的微环境下,膜层的沉积速度加快,省去陈化阶段,提高包膜效率,同时在超声场的作用下,可以提高包膜剂的利用率,减少水洗量和水洗时间。
进一步的,所述步骤2中加入在包膜罐中加入偏铝酸钠和无机酸,使料浆的pH值维持在中性。
进一步的,根据包膜罐的大小和频率,布设对应的振幅杆的数量和类型。
进一步的,所述超声方式采用连续超声或脉冲超声。
综上所述,由于采用了上述技术方案,本发明的有益效果是:
1、在前期分散浆料过程中,采用高频超声,包膜过程的前期采用高频超声,后期可调到中低频,以缩短晶体成核的诱导期,降低包膜时间;
2、超声强度在前期浆料刚加入包膜罐时100%全开,在包膜过程中前期超声强度保持 100%,利于晶核生成,后期强度逐渐降低到50%,强度与包膜温度相匹配,尽量避免超声导致的温升效应;
3、利用超声的空泡效应,在包膜过程中保持浆料的分散性,避免多颗粒包覆在一块的现象,提升颗粒包膜的完整度,同时降低粘度,提高传质效率,减少包膜时间;
4、利用超声的空泡效应,营造一个高温高压的微环境,增加晶核数量,减少包膜剂结晶粒度,提高膜层致密度和包膜层的完整度,提供钛白粉的耐候性;
5、利用超声的空泡效应,避免包膜剂的自成核现象,提高包膜剂的利用率,减少包膜剂的用量,减少水洗量,降低水洗时间。
附图说明
本发明将通过例子并参照附图的方式说明,其中:
图1是本发明的步骤示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚,下面将结合本申请实施例中附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本申请一部分实施例,而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以各种不同的配置来布置和设计。因此,以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围,而是仅仅表示本申请的选定实施例。基于本申请的实施例,本领域技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例,都属于本申请保护的范围。
下面结合附图1对本发明作详细说明:
实施例1
一种二氧化钛表面包覆的方法,其特征在于,包括如下步骤:
步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统,超声功率调整为100KW,调整超声频率为80kHz;
步骤B:超声10min后,调整浆料温度为80℃,调整pH值为中性并在包膜的过程中加入偏铝酸钠和无机酸,使料浆的pH值维持在中性,将超声频率调整至30kHz全功率输出,持续10min min,然后在温度不上升的情况下,将超声功率逐步下调50KW,持续15min,直到料浆完成包膜;
步骤C:打开包膜罐的排料阀,将包膜好的浆料排放到洗涤罐中,将浆料洗涤至中性后,经干燥粉碎后即得到钛白粉成品。
实施例2
步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统,超声功率调整为80KW,调整超声频率为100kHz;
步骤B:超声15min后,调整浆料温度为90℃,调整pH值为中性并在包膜的过程中加入偏铝酸钠和无机酸,使料浆的pH值维持在中性,将超声频率调整至30kHz全功率输出,持续15min,然后在温度不上升的情况下,将超声功率逐步下调40KW,持续20min,直到料浆完成包膜;
步骤C:打开包膜罐的排料阀,将包膜好的浆料排放到洗涤罐中,将浆料洗涤至中性后,经干燥粉碎后即得到钛白粉成品。
实施例2
步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统,超声功率调整为50KW,调整超声频率为125KHz;
步骤B:超声20min后,调整浆料温度为90℃,调整pH值为中性并在包膜的过程中维持中性,将超声频率调整至30kHz全功率输出,持续20min,然后在温度不上升的情况下,将超声功率逐步下调25KW,持续30min,直到料浆完成包膜;
步骤C:打开包膜罐的排料阀,将包膜好的浆料排放到洗涤罐中,将浆料洗涤至中性后,经干燥粉碎后即得到钛白粉成品。
上述实施例中,所述超声方式采用连续超声或脉冲超声。
上述实施例中,实现上述二氧化钛表面表面包覆的方法的装置包括:浆料供应及排出系统、带搅拌的包膜罐,加热及温度控制系统,pH调节及控制系统等。
上述实施例中,包膜罐中的振幅杆的数量和类型是根据包膜罐的大小和频率需要进行布设,具体的,圆环体状或类似圆环体状的超声波辐射头,1方的罐子放1个辐射头,2方的罐子放2个辐射头,3方的罐子放4个辐射头,罐体同心圆布设在1/2半径处。
以上所述,以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。
Claims (4)
1.一种二氧化钛表面包覆的方法,其特征在于,包括如下步骤:
步骤A:将砂磨后粒度合格的浆料排入包膜罐中,搅拌同时将打开超声系统,超声功率调整为0.1~100KW,调整超声频率为25KHz~2.5GHz;
步骤B:超声10~20min后,调整浆料温度为60~90℃,调整pH值为中性并在包膜的过程中维持中性,将超声频率调整至30kHz全功率输出,持续10~20min,然后在温度不上升的情况下,将超声功率逐步下调全功率的50%,持续15~120min,直到料浆完成包膜;
步骤C:打开排料阀,将包膜好的浆料排放到洗涤罐中,将浆料洗涤至中性后,经干燥粉碎后即得到钛白粉成品。
2.根据权利要求1所述的一种二氧化钛表面包覆的方法,其特征在于,所述步骤2中加入在包膜罐中加入偏铝酸钠和无机酸,使料浆的pH值维持在中性。
3.根据权利要求1所述的一种二氧化钛表面包覆的方法,其特征在于,根据包膜罐的大小和频率,布设对应的振幅杆的数量和类型。
4.根据权利要求1所述的一种二氧化钛表面包覆的方法,其特征在于,所述超声方式采用连续超声或脉冲超声。
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CN102516825A (zh) * | 2011-11-17 | 2012-06-27 | 攀钢集团研究院有限公司 | 一种钛白粉的连续无机包膜方法 |
CN107722677A (zh) * | 2017-11-21 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | 钛白粉硅铝包膜方法 |
CN110157219A (zh) * | 2019-06-26 | 2019-08-23 | 河南佰利联新材料有限公司 | 一种高性能色母粒专用钛白粉的制备方法 |
CN111100481A (zh) * | 2019-11-20 | 2020-05-05 | 攀钢集团重庆钛业有限公司 | 钛白粉表面包覆致密氧化铝的方法 |
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CN102516825A (zh) * | 2011-11-17 | 2012-06-27 | 攀钢集团研究院有限公司 | 一种钛白粉的连续无机包膜方法 |
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CN110157219A (zh) * | 2019-06-26 | 2019-08-23 | 河南佰利联新材料有限公司 | 一种高性能色母粒专用钛白粉的制备方法 |
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