CN116855170A - 一种rtv防污闪涂料和制备方法 - Google Patents
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Abstract
本发明公开了一种RTV防污闪涂料和制备方法,属于电力用涂料技术技术领域,包括以下重量份的组分:端羟基聚二甲基硅氧烷30~40份、交联剂1~2份、催化剂0.02~0.06份、分散剂0.1~0.5份、气相SiO22~5份、硅微粉7~15份、纳米BN1~6份、阻燃剂5~12份、聚稳丁腈橡胶10~20份、甲基硅油3~5份、溶剂10~15份、颜料1~3份;硅微粉的粒径为1800目~2200目,硅微粉与RTV分子相互作用形成稳定体系,进而提升拉伸强度和撕裂强度;聚稳丁腈橡胶提升抗开裂性能的同时使RTV涂料的耐热性和耐酸碱性大大提升;溶剂丙二醇甲醚醋酸酯,更加环保的同时大大降低其表干时间。
Description
技术领域
本发明属于电力用涂料技术领域,特别是涉及到一种RTV防污闪涂料和制备方法。
背景技术
在当今社会的生产生活主要依靠电能,随着电网的规模的扩大,保障电力设备安全稳定运行变得愈发重要。干式空心电抗器作为变电站重要的户外高压电力设备之一,其包封老化、过热、开裂引起的故障可能导致大规模停电,给社会造成巨大的经济损失。
电抗器运行过程中由于其结构特点,会导致运行温度升高,再加上环境因素的耦合,诸如日照、盐雾和潮湿都会对干抗的影响较大,造成包封绝缘降低,容易出现局部放电、匝间短路等故障。为防止诸多因素对电抗器包封的侵蚀,需要在电抗器包封表面涂刷RTV涂料,该涂料需要具有优越的耐候性以及防污闪性能,进而提高干式空心电抗器的绝缘,防止局部放电和匝间短路故障发生。RTV涂料是室温硫化硅橡胶长效防污闪涂料的简称。RTV涂料是以室温硫化硅橡胶为基本原料的一类新型憎水性涂料,它涂敷到绝缘子表面后,可在常温下固化为一层类似橡胶的薄膜,并牢固地覆盖在绝缘子的表面,能够显著提髙绝缘子的污闪电压。
尽管RTV涂料具有优良的防污闪性能及常温硫化的特点使其在使用上具有较大的灵活性和通用性,但偏低的综合性能及半混乱的生产和使用状况使现有RTV涂料仅适合作为补救性或临时性产品,而不能作为正式性或持久性产品使用。偏低的综合性能具体表现在抗开裂性能、耐热性和耐酸碱性较差、毒性高以及表干时间长等问题。
因此现有技术当中亟需要一种新型的技术方案来解决这一问题。
发明内容
为了克服现有技术存在的不足,本发明提供一种RTV防污闪涂料和制备方法,用于提升RTV涂料的综合性能。
为了实现上述目的,本发明采用的技术方案是:一种RTV防污闪涂料,包括以下重量份的组分:端羟基聚二甲基硅氧烷30~40份、交联剂1~2份、催化剂0.02~0.06份、分散剂0.1~0.5份、气相SiO22~5份、硅微粉7~15份、纳米BN 1~6份、阻燃剂5~12份、聚稳丁腈橡胶10~20份、甲基硅油3~5份、溶剂10~15份、颜料1~3份;
所述硅微粉的粒径为1800目~2200目。
优选的所述溶剂为丙二醇甲醚醋酸酯。所述端羟基聚二甲基硅氧烷的粘度为10000~35000mm2/s。
所述气相SiO2的比表面积为450mm2/g。
所述的阻燃剂为纳米十溴二苯己烷。
所述交联剂和催化剂分别为与基料对应的脱醇型交联剂和锡类催化剂。
一种如上任一所述RTV防污闪涂料的制备方法,包括以下步骤:
对填料进行表面处理;所述填料为气相SiO2、硅微粉、纳米BN和阻燃剂按重量份配比混合;
将表面处理过的填料溶解于溶剂中,加入分散剂用分散机搅拌,并超声波分散;
将端羟基聚二甲基硅氧烷与催化剂、交联剂、聚稳丁腈橡胶、甲基硅油、颜料按重量份配比混合,分散机搅拌;加入步骤二制得的溶液;在反应釜内搅拌,降至常温后在真空条件下脱水、灌装。
优选的步骤一所述对填料进行表面处理的方法为,将无水乙醇与去离子水混合;加入草酸调节PH值;而后加入填料粉体以及硅烷偶联剂;并在烧瓶内搅拌;烧瓶的上方安装冷凝回流装置;而后抽干液体,置于干燥箱内。
通过上述设计方案,本发明可以带来如下有益效果:
1、通过加入粒径为1800目~2200目的硅微粉,与RTV分子相互作用形成稳定体系,既能保证硅微粉渗入到RTV分子当中,又能保证粒子间距离小于粒子直径,增加了分子间作用力,进而提升拉伸强度和撕裂强度;
2、聚稳丁腈橡胶内部的CN基团和硅橡胶、气相SiO2和硅微粉表面的硅醇基均为极性基团,这会增大分子间的相互作用,进而提升抗开裂性能,同时降低了硅橡胶分子的分解与迁移,这会使RTV涂料的耐热性和耐酸碱性大大提升;
3、选用溶剂为丙二醇甲醚醋酸酯,丙二醇甲醚醋酸酯分子中既有非极性官能团:烷基,也有极性官能团:醚键和羰基,解决了表面非极性物质:端羟基聚二甲基硅氧烷和表面极性物质:丁腈橡胶、表面改性后的硅微粉和气相SiO2相互间因斥力大而溶解能力低的问题;
4、溶剂为丙二醇甲醚醋酸酯,具有低毒和挥发性较高的特点,更加环保的同时大大降低其表干时间;
5、添加少量纳米BN可以在不改变涂料性质前提下提升RTV涂料的热膨胀系数,进而使涂料耐热性提升。
附图说明
图1为本发明一种RTV防污闪涂料和制备方法的RTV涂料制备流程图。
图2为本发明一种RTV防污闪涂料和制备方法的填料分散及表面处理流程图。
具体实施方式
以下结合附图对本发明的具体实施方式作详细的说明
需要特别说明的是文中所述"前后,上下,左右"等只是基于附图为了直观描述位置关系的一种简化说法,并非对技术方案的限定。
为了更清楚地说明本发明,下面结合优选实施例对本发明做进一步的说明。本领域技术人员应当理解。下面所具体描述的内容是说明性的而非限制性的,在不脱离权利要求中所阐述的发明机理和范围的情况下,使用者可以对下列参数进行各种改变。为了避免混淆本发明的实质,公知的方法和过程并没有详细的叙述。
由附图1~2所示:一种RTV防污闪涂料,包括以下重量份的组分:端羟基聚二甲基硅氧烷30~40份、交联剂1~2份、催化剂0.02~0.06份、分散剂0.1~0.5份、气相SiO22~5份、硅微粉7~15份、纳米BN 1~6份、阻燃剂5~12份、聚稳丁腈橡胶10~20份、甲基硅油3~5份、溶剂10~15份、颜料1~3份;
所述硅微粉的粒径为1800目~2200目。通过加入粒径为1800目~2200目的硅微粉,与RTV分子相互作用形成稳定体系,既能保证硅微粉渗入到RTV分子当中,又能保证粒子间距离小于粒子直径,涂料结晶化,形成立体式交叉网络结构,增加了分子间作用力,进而提升拉伸强度和撕裂强度;如果硅微粉小分子粒子直径过大,会使硅微粉更难渗入到RTV分子当中,降低分散性,导致抗开裂性能下降;如果硅微粉小分子粒子直径过小,会使硅微粉小分子与RTV分子间距离增大,降低分子间作用力,也会导致RTV涂料抗开裂性能下降;
掺杂不同粒径硅微粉后厚度1mm的端羟基聚二甲基硅氧烷为样本进行试验,采用深圳万测实验设备有限公司生产的ETM105D型微机控制电子万能试验机,在做拉伸试验及拉断伸长率试验前使用哑铃型裁刀裁切试样,在做撕裂强度试验时使用新月形裁刀裁切试样,试验数据如表1所示:
表1不同硅微粉粒径下RTV涂料的抗开裂性能对比
硅微粉粒径 | 拉伸强度MPa | 拉断伸长率% | 撕裂强度kN/m |
1.25μm/7000目 | 1.26 | 109.33 | 1.85 |
2.5μm/6000目 | 1.63 | 154.57 | 4.37 |
3.4μm/4000目 | 2.96 | 221.63 | 7.99 |
5μm/3000目 | 4.17 | 288.21 | 10.46 |
6.7μm/2200目 | 4.86 | 301.83 | 10.61 |
6.5μm/2000目 | 5.01 | 320.34 | 10.32 |
8μm/1800目 | 4.61 | 337.91 | 9.53 |
进一步的所述溶剂为丙二醇甲醚醋酸酯。丙二醇甲醚醋酸酯分子中既有非极性官能团:烷基,也有极性官能团:醚键和羰基,解决了表面非极性物质:端羟基聚二甲基硅氧烷和表面极性物质:丁腈橡胶、表面改性后的硅微粉和气相SiO2相互间因斥力大而溶解能力低的问题;丙二醇甲醚醋酸酯分子表面张力非常低,这决定其挥发能力强,大大降低其表干时间,
进一步的所述端羟基聚二甲基硅氧烷的粘度为10000~35000mm2/s。其与气相SiO2结合后会体现优良的触变性,在使用时不流淌、不拉丝、薄厚均匀,利于施工;
进一步的所述气相SiO2的比表面积为450mm2/g。
进一步的所述的阻燃剂为纳米十溴二苯己烷。十溴二苯己烷是一种高绝缘的环保阻燃剂,可以与RTV良好相溶,可以同时以低成本即可提高机械性能、提高热稳定性和降低可燃性,使RTV涂料阻燃性达到FV-0级,它添加量不多,不会影响到涂料各项指标。
进一步的所述交联剂和催化剂分别为与基料对应的脱醇型交联剂和锡类催化剂。
一种如上任一所述RTV防污闪涂料的制备方法,包括以下步骤:
步骤一、对填料进行表面处理;所述填料为气相SiO2、硅微粉、纳米BN和阻燃剂按重量份配比混合;
步骤二、将表面处理过的填料溶解于溶剂中,加入埃夫卡分散剂用分散机搅拌90分钟,并超声波分散30min;
步骤三、将端羟基聚二甲基硅氧烷与催化剂、交联剂、聚稳丁腈橡胶、甲基硅油、颜料按重量份配比混合,分散机搅拌90分钟;加入步骤二制得的溶液;在反应釜内100~150℃条件下以1000r/min的转速搅拌30分钟,降至常温后在真空条件下脱水、灌装。
进一步的步骤一所述对填料进行表面处理的方法为,将无水乙醇与去离子水以4:1质量比混合;加入草酸调节PH值至3~4;而后加入填料粉体以及质量为填料质量3%的Kh560硅烷偶联剂;并在80℃温度下于烧瓶内搅拌8小时;烧瓶的上方安装冷凝回流装置;而后抽干液体,置于160℃干燥箱内8小时。
具体实施中,实施例1的配方是:端羟基聚二甲基硅氧烷(粘度15000mm2/s)35份,交联剂1份,催化剂0.4份,分散剂0.4份,气相SiO23份,2000目硅微粉25份,十溴二苯己烷6份,纳米BN 2份,甲基硅油13份,溶剂11.2份,颜料3份。在该配方下抗开裂耐候RTV长效防污闪涂料具有最强的抗开裂性能,其拉伸强度为4.72MPa,拉断伸长率为315.64%,撕裂强度为9.82kN/m;
实施例2的配方是:端羟基聚二甲基硅氧烷(粘度35000mm2/s)40份,交联剂2份,催化剂0.8份,分散剂0.1份,气相SiO23份,2000目硅微粉15份,十溴二苯己烷8份,纳米BN 3份,甲基硅油13份,溶剂11.1份,颜料4份。在该配方下抗开裂耐候RTV长效防污闪涂料具有最短的表干时间,其表干时间为25min;
实施例3的配方是:端羟基聚二甲基硅氧烷(粘度15000mm2/s)32份,交联剂1.5份,催化剂0.6份,分散剂0.3份,气相SiO23份,2000目硅微粉13份,十溴二苯己烷12份,纳米BN8份,甲基硅油13份,溶剂13.6份,颜料3份。在该配方下抗开裂耐候RTV长效防污闪涂料具有最强的阻燃性能,其阻燃性达到FV-0级;
实施例4的配方是:端羟基聚二甲基硅氧烷(粘度15000mm2/s)38份,交联剂1.6份,催化剂0.7份,分散剂0.2份,气相SiO25份,2000目硅微粉17份,十溴二苯己烷6份,纳米BN 2份,甲基硅油12份,溶剂14.5份,颜料3份。在该配方下抗开裂耐候RTV长效防污闪涂料具有最强的介电强度;介电强度25.27kV/mm;
本发明所述方法在保证绝缘质量的同时可以通过改变材料配比达到缩短表干时长、增强了抗开裂性能,或增强阻燃性能的效果,以满足不同场合的应用需求。
具体应用时,包括以下步骤:
步骤一、使用除尘装置对电抗器包封外表面及气道内表面进行气吹除尘处理;
步骤二、封包电抗器底部;
步骤三、使用静电喷涂机对电抗器包封及气道表面进行喷灌漫涂RTV防污闪涂料;
步骤四、当包封及气道表面喷灌材料漫至设定高度后,静置1~2小时;
步骤五、从封包底部对气道内RTV涂料导流进行回收;
步骤六、取消电抗器底部封包。
可大大节约成本,满足循环使用的要求。该工艺技术可保证电抗器包封外表面及气道内表面均匀,无气泡、无流挂,最终涂层厚度0.4-0.5mm。以此可实现气道内表面的全方位防护。
显然,上述所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
Claims (8)
1.一种RTV防污闪涂料,其特征在于,包括以下重量份的组分:端羟基聚二甲基硅氧烷30~40份、交联剂1~2份、催化剂0.02~0.06份、分散剂0.1~0.5份、气相SiO22~5份、硅微粉7~15份、纳米BN 1~6份、阻燃剂5~12份、聚稳丁腈橡胶10~20份、甲基硅油3~5份、溶剂10~15份、颜料1~3份;
所述硅微粉的粒径为1800目~2200目。
2.根据权利要求1所述一种RTV防污闪涂料,其特征在于,所述溶剂为丙二醇甲醚醋酸酯。
3.根据权利要求1所述一种RTV防污闪涂料,其特征在于,所述端羟基聚二甲基硅氧烷的粘度为10000~35000mm2/s。
4.根据权利要求1所述一种RTV防污闪涂料,其特征在于,所述气相SiO2的比表面积为450mm2/g。
5.根据权利要求1所述一种RTV防污闪涂料,其特征在于,所述阻燃剂为纳米十溴二苯己烷。
6.根据权利要求1所述一种RTV防污闪涂料,其特征在于,所述交联剂和催化剂分别为与基料对应的脱醇型交联剂和锡类催化剂。
7.一种如权利要求1~6任一所述RTV防污闪涂料的制备方法,其特征在于,包括以下步骤:
对填料进行表面处理;所述填料为气相SiO2、硅微粉、纳米BN和阻燃剂按重量份配比混合;
将表面处理过的填料溶解于溶剂中,加入分散剂用分散机搅拌,并超声波分散;
将端羟基聚二甲基硅氧烷与催化剂、交联剂、聚稳丁腈橡胶、甲基硅油、颜料按重量份配比混合,分散机搅拌;加入步骤二制得的溶液;在反应釜内搅拌,降至常温后在真空条件下脱水、灌装。
8.根据权利要求7所述一种RTV防污闪涂料的制备方法,其特征在于,步骤一所述对填料进行表面处理的方法为:将无水乙醇与去离子水混合;加入草酸调节PH值;而后加入填料粉体以及硅烷偶联剂;并在烧瓶内搅拌;烧瓶的上方安装冷凝回流装置;而后抽干液体,置于干燥箱内。
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