CN107176846A - 一种耐荷重强的耐火砖 - Google Patents
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Abstract
本发明属于耐火材料技术领域,具体公开了一种耐荷重强的耐火砖,由以下重量份组份制备而成:硅藻土100~120份、陶瓷砂60~80份、硅微粉25~30份、氧化钨6~10份、氮化硅6~8份、碳化硼16~20份、ABS树脂30~40份、高密度聚乙烯树脂20~25份、锆酯酸偶联剂1~2份、过氧化二异丙苯0.6~0.8份、二氧化硅气凝胶10~15份、分散剂1~2份、粘合剂6~10份、水350~450份、耐火浸渍液100~200份,粘合剂为沥青或高岭土水泥,耐火浸渍液由纳米级蛭石粉、磷酸铝粘结剂、钛白粉、液态硬化剂、水混合而成。本发明的耐火砖耐荷重强、耐压强度高,高温下长期使用耐荷重性能下降小。
Description
技术领域
本发明属于耐火材料技术领域,具体涉及一种耐荷重强的耐火砖。
背景技术
耐火材料是指在无荷重情况下能够抵抗不低于1580 ℃而不发生软化的一类耐高温材料,被广泛应用于冶金、化工、石油、硅酸盐等工业领域。耐火材料按形态可以分为定形耐火材料与不定形耐火材料。其中定形耐火材料主要是指耐火砖,由耐火黏土或其他耐火原料烧制成,按制备工艺方法来划分可分为烧成砖、不烧砖、电熔砖、耐火隔热砖;按形状和尺寸可分为标准型砖、普通砖、特异型砖,可用作建筑窑炉和各种热工装置的高温建筑材料和结构材料,并在高温下能经受各种物理化学变化和机械作用,因此要求耐火砖具有较强的耐荷重能力,而耐火砖长期在高温下使用也会导致耐火砖耐荷重能力下降,造成窑炉或热工装置坍塌,影响正常的生产,并带来生产事故危害。中国专利CN201506872145,专利名称一种耐火砖及其制备方法,申请日期2015年10月22日,公开了一种由铬渣、煤矸石、粉煤灰、废石膏、石英尾砂、钒铁废渣、硼泥、黄金尾矿、高磷尾矿、膨胀珍珠岩、蛇纹石、糊精、淀粉、亚硫酸盐纸浆废液等制成的耐火砖,存在高温下长期使用造成耐火砖耐负荷能力下降的风险,尤其是膨胀珍珠岩、废石膏等存在冷热冲击下的膨胀收缩。
发明内容
针对耐火砖高温下长期使用存在耐荷重能力下降的问题,本发明的目的在于提供一种耐荷重强的耐火砖,具有较强的耐荷重性能,耐压强度高,并且高温下长期使用耐荷重性能下降小,安全性能高。
本发明提供如下的技术方案:
一种耐荷重强的耐火砖,由以下重量份组份制备而成:硅藻土100~120份、陶瓷砂60~80份、硅微粉25~30份、氧化钨6~10份、氮化硅6~8份、碳化硼16~20份、ABS树脂30~40份、高密度聚乙烯树脂20~25份、锆酯酸偶联剂1~2份、过氧化二异丙苯0.6~0.8份、二氧化硅气凝胶10~15份、分散剂1~2份、粘合剂6~10份、水350~450份、耐火浸渍液100~200份。
作为本发明的一种改进,所述粘合剂为沥青或高岭土水泥。
作为本发明的一种改进,所述耐火浸渍液由以下重量份组份混合而成:纳米级蛭石粉50~60份、磷酸铝粘结剂10~15份、钛白粉6~8份、液态硬化剂0.4~0.8份、水300~400份。
一种耐荷重强的耐火砖的制备方法,包括以下步骤:
(1)将硅藻土、陶瓷砂分别研磨、过筛,然后混合煅烧得到煅烧料;
(2)将ABS树脂、高密度聚乙烯树脂、过氧化二异丙苯、二氧化硅气凝胶、分散剂混匀并送入螺杆造粒机制成塑料粒子;
(3)将煅烧料、塑料粒子与硅微粉、氧化钨、氮化硅、碳化硼、钛酯酸偶联剂混匀后加热至250 ℃~300 ℃保持2~3小时得到初级料;
(4)向初级料中加入水、粘合剂并充分搅拌制成可流动的泥浆状料液;
(5)将泥浆状料液注入模具浇注成砖坯,然后干燥并装入窑炉中煅烧制成耐火砖半成品;
(6)在耐火砖半成品表面喷涂耐火浸渍液,并置于鼓风环境中干燥得到耐火砖。
作为本发明方法的一种改进,步骤(1)中过筛所用筛网的规格为 1200~1500目,煅烧温度为550 ℃~650 ℃,煅烧时间2~3小时。
作为本发明方法的一种改进,步骤(5)中的煅烧温度为1200 ℃~1300 ℃,煅烧时间2~3小时。
作为本发明方法的一种改进,步骤(6)中的耐火浸渍液的pH值为6.5~6.8,喷涂密度为0.8 mL/cm2~1.2 mL/cm2。
作为本发明方法的一种改进,步骤(6)中的干燥温度为130 ℃~150 ℃,干燥时间60 ~90 分钟,空气流动速度3 m/s~5 m/s。
本发明的耐荷重强的耐火砖以硅藻土、陶瓷砂为主料具有较高的耐高温、耐火性能,而且陶瓷砂的韧性高、硬度大。ABS树脂、高密度聚乙烯树脂具有较强的机械抗拉伸强度、弯曲强度和韧性,而且耐压能力强,耐热性、化学稳定性高。ABS树脂与高密度聚乙烯树脂经过氧化二异丙苯交联后形成的聚合物的耐压强度、耐老化、耐环境应力的能力进一步提高。然后将该聚合物添加到耐火砖中对耐火砖进行改性,改善了耐火砖的抗压、抗弯曲性能,同时ABS树脂与高密度聚乙树脂聚合后的骨架间隙形成一定的缓冲空间,使耐火砖在高温下承重时有一定的压力释放空间。而且ABS树脂、高密度聚乙烯树脂的耐环境应力强,改善并强化耐火砖的强度性能、耐环境、耐热冲击性能,强化耐火砖长期使用的性能。硅微粉、氧化钨、氮化硅、碳化硼的机械强度高、硬度大,耐腐蚀效果好,可以强化聚合物增强耐火砖强度的作用。耐火浸渍液在耐火砖上形成耐火浸渍液成膜,提高耐火砖的耐火性能和耐热稳定性,强化耐火砖的使用性能。耐火浸渍液的弱酸性使耐火砖半成品形成蚀刻痕迹,使耐火浸渍液成膜稳定附着在耐火砖表面。二氧化硅气凝胶在ABS树脂、高密度聚乙烯树脂处形成保温层,提高ABS树脂与高密度聚乙烯树脂的耐热能力。
本发明的有益效果如下:
本发明的耐荷重强的耐火砖,具有较强的耐荷重性能,耐压强度高,并且高温下长期使用耐荷重性能下降小,安全性能高。
具体实施方式
下面就本发明的具体实施方式作进一步说明:
如无特别说明,本发明中所采用的原料均可从市场上购得或是本领域常用的,如无特别说明,下述实施例中的方法均为本领域的常规方法。
实施例1
一种耐荷重强的耐火砖,由以下组份制备而成:硅藻土100 g、陶瓷砂60 g、硅微粉25g、氧化钨6 g、氮化硅6 g、碳化硼16 g、ABS树脂30 g、高密度聚乙烯树脂20 g、锆酯酸偶联剂1 g、过氧化二异丙苯0.6 g、二氧化硅气凝胶10 g、分散剂1 g、粘合剂6 g、水350 g、耐火浸渍液100 g,其中粘合剂为沥青或高岭土水泥,耐火浸渍液由以下组份混合而成:纳米级蛭石粉50 g、磷酸铝粘结剂10 g、钛白粉6 g、液态硬化剂0.4 g、水300 g。
一种耐荷重强的耐火砖的制备方法,包括以下步骤:
(1)分别研磨硅藻土、陶瓷砂,经1200目筛网过筛后混合,在550 ℃下煅烧得到煅烧料;
(2)将ABS树脂、高密度聚乙烯树脂、过氧化二异丙苯、二氧化硅气凝胶、分散剂混匀并送入螺杆造粒机制成塑料粒子;
(3)将煅烧料、塑料粒子与硅微粉、氧化钨、氮化硅、碳化硼、钛酯酸偶联剂混匀后加热至250 ℃保持2~3小时得到初级料;
(4)向初级料中加入粘合剂、水并充分搅拌制成可流动的泥浆状料液;
(5)将泥浆状料液注入模具浇注成砖坯,然后干燥,然后装入窑炉中在1200 ℃下煅烧2小时制成耐火砖半成品;
(6)将耐火浸渍液的pH值调节至6.5~6.8,然后喷涂在将耐火砖半成品表面,喷涂密度为0.8 mL/cm2,将喷涂后的耐火砖半成品置于鼓风环境中干燥得到耐火砖,干燥温度为130℃,干燥时间60 分钟,空气流动速度3 m/s。
所得耐火砖的湿气孔率为18%,体积密度为4.2 g/cm3,23±2℃下的耐压强度为286 MPa,1600 ℃下的抗折强度为79 MPa。
实施例2
一种耐荷重强的耐火砖,由以下组份制备而成:硅藻土110 g、陶瓷砂70 g、硅微粉27.5g、氧化钨8 g、氮化硅7 g、碳化硼18 g、ABS树脂35 g、高密度聚乙烯树脂22.5 g、锆酯酸偶联剂1.5 g、过氧化二异丙苯0.7 g、二氧化硅气凝胶12.5 g、分散剂1.5 g、粘合剂8 g、水400g、耐火浸渍液150 g,其中粘合剂为沥青或高岭土水泥,耐火浸渍液由以下组份混合而成:纳米级蛭石粉55 g、磷酸铝粘结剂12.5 g、钛白粉7 g、液态硬化剂0.6 g、水350 g。
一种耐荷重强的耐火砖的制备方法,包括以下步骤:
(1)分别研磨硅藻土、陶瓷砂,经1350目筛网过筛后混合并在600 ℃下煅烧得到煅烧料;
(2)将ABS树脂、高密度聚乙烯树脂、过氧化二异丙苯、二氧化硅气凝胶、分散剂混匀并送入螺杆造粒机制成塑料粒子;
(3)将煅烧料、塑料粒子与硅微粉、氧化钨、氮化硅、碳化硼、钛酯酸偶联剂混匀后加热至275 ℃保持2.5小时得到初级料;
(4)向初级料中加入粘合剂、水并充分搅拌制成可流动的泥浆状料液;
(5)将泥浆状料液注入模具浇注成砖坯,然后干燥,然后装入窑炉中在1250 ℃下煅烧2.5小时制成耐火砖半成品;
(6)将耐火浸渍液的pH值调节值6.5~6.8,然后喷涂在将耐火砖半成品表面,喷涂密度为1.0 mL/cm2,将喷涂后的耐火砖半成品置于鼓风环境中干燥得到耐火砖,干燥温度为140℃,干燥时间75分钟,空气流动速度4m/s。
所得耐火砖的湿气孔率为21%,体积密度为3.9 g/cm3,23±2℃下的耐压强度为275 MPa,1600 ℃下的抗折强度为83 MPa。
实施例3
一种耐荷重强的耐火砖,由以下组份制备而成:硅藻土120 g、陶瓷砂80 g、硅微粉30g、氧化钨10 g、氮化硅8 g、碳化硼20 g、ABS树脂40 g、高密度聚乙烯树脂25 g、锆酯酸偶联剂2 g、过氧化二异丙苯0.8 g、二氧化硅气凝胶15 g、分散剂2 g、粘合剂10 g、水450 g、耐火浸渍液200 g,其中粘合剂为沥青或高岭土水泥,耐火浸渍液由以下组份混合而成:纳米级蛭石粉60 g、磷酸铝粘结剂15 g、钛白粉8 g、液态硬化剂0.8 g、水400 g。
一种耐荷重强的耐火砖的制备方法,包括以下步骤:
(1)分别研磨硅藻土、陶瓷砂,经1500目筛网过筛后混合并在650 ℃下煅烧得到煅烧料;
(2)将ABS树脂、高密度聚乙烯树脂、过氧化二异丙苯、二氧化硅气凝胶、分散剂混匀并送入螺杆造粒机制成塑料粒子;
(3)将煅烧料、塑料粒子与硅微粉、氧化钨、氮化硅、碳化硼、钛酯酸偶联剂混匀后加热至300 ℃保持3小时得到初级料;
(4)向初级料中加入粘合剂、水并充分搅拌制成可流动的泥浆状料液;
(5)将泥浆状料液注入模具浇注成砖坯,然后干燥,然后装入窑炉中在1300 ℃下煅烧3小时制成耐火砖半成品;
(6)将耐火浸渍液的pH值调节值6.5~6.8,然后喷涂在将耐火砖半成品表面,喷涂密度为1.2 mL/cm2,将喷涂后的耐火砖半成品置于鼓风环境中干燥得到耐火砖,干燥温度为150℃,干燥时间90 分钟,空气流动速度5 m/s。
所得耐火砖的湿气孔率为20%,体积密度为4.02 g/cm3,23±2℃下的耐压强度为290MPa,1600 ℃下的抗折强度为86 MPa。
Claims (8)
1.一种耐荷重强的耐火砖,其特征在于,由以下重量份组份制备而成:硅藻土100~120份、陶瓷砂60~80份、硅微粉25~30份、氧化钨6~10份、氮化硅6~8份、碳化硼16~20份、ABS树脂30~40份、高密度聚乙烯树脂20~25份、锆酯酸偶联剂1~2份、过氧化二异丙苯0.6~0.8份、二氧化硅气凝胶10~15份、分散剂1~2份、粘合剂6~10份、水350~450份、耐火浸渍液100~200份。
2.根据权利要求1所述的耐荷重强的耐火砖,其特征在于,所述粘合剂为沥青或高岭土水泥。
3.根据权利要求1或2所述的耐荷重强的耐火砖,其特征在于,所述耐火浸渍液由以下重量份组份混合而成:纳米级蛭石粉50~60份、磷酸铝粘结剂10~15份、钛白粉6~8份、液态硬化剂0.4~0.8份、水300~400份。
4.一种如权利要求1所述的耐荷重强的耐火砖的制备方法,包括以下步骤:
(1)将硅藻土、陶瓷砂分别研磨、过筛,然后混合煅烧得到煅烧料;
(2)将ABS树脂、高密度聚乙烯树脂、过氧化二异丙苯、二氧化硅气凝胶、分散剂混匀并送入螺杆造粒机制成塑料粒子;
(3)将煅烧料、塑料粒子与硅微粉、氧化钨、氮化硅、碳化硼、钛酯酸偶联剂混匀后加热至250 ℃~300 ℃保持2~3小时得到初级料;
(4)向初级料中加入水、粘合剂并充分搅拌制成可流动的泥浆状料液;
(5)将泥浆状料液注入模具浇注成砖坯,然后干燥并装入窑炉中煅烧制成耐火砖半成品;
(6)在耐火砖半成品表面喷涂耐火浸渍液,并置于鼓风环境中干燥得到耐火砖。
5.根据权利要求4所述的耐荷重强的耐火砖的制备方法,其特征在于,步骤(1)中过筛所用筛网的规格为 1200~1500目,煅烧温度为550 ℃~650 ℃,煅烧时间2~3小时。
6.根据权利要求 4所述的耐荷重强的耐火砖的制备方法,其特征在于,步骤(5)中的煅烧温度为1200 ℃~1300 ℃,煅烧时间2~3小时。
7.根据权利要求4所述的耐荷重强的耐火砖的制备方法,其特征在于,步骤(6)中的耐火浸渍液的pH值为6.5~6.8,喷涂密度为0.8 mL/cm2~1.2 mL/cm2。
8.根据权利要求4所述的耐荷重强的耐火砖的制备方法,其特征在于,步骤(6)中的干燥温度为130 ℃~150 ℃,干燥时间60 ~90 分钟,空气流动速度3 m/s~5 m/s。
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