CN105601342B - 一种提高泡沫砖抗渗性和耐腐蚀性的方法 - Google Patents
一种提高泡沫砖抗渗性和耐腐蚀性的方法 Download PDFInfo
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Abstract
本发明公开了一种提高泡沫砖抗渗性能和耐腐蚀性能的方法,包括:(1)清除块材表面的杂质;(2)将块材用处理液浸泡6‑9小时后,在100‑120℃下烘干;(3)将泡沫砖浸在树脂或非金属防腐材料分散液中,通过压力作用,使树脂或非金属防腐材料渗透到泡沫砖的微裂纹和微孔中,进而全部填充、封堵裂纹和微孔,并包覆在泡沫砖表面,固化后形成致密防护层;(4)经步骤(3)处理后,在泡沫砖表面再涂覆一层树脂或非金属防腐材料。通过本方法处理的泡沫砖,极大提高其抗渗性能,同时也可提高泡沫砖的耐腐蚀性能和耐磨性能。
Description
技术领域
本发明涉及一种提高泡沫砖抗渗性和耐腐蚀性的方法,特别涉及一种发泡陶瓷砖、泡沫玻璃砖等无机非金属固体发泡材料的改性,通过改性,提高发泡材料的抗渗性能、耐腐蚀性能和耐磨性能。
背景技术
泡沫陶瓷砖、泡沫玻璃砖等无机非金属固体发泡材料是用无机非金属粉料加入发泡剂,通过高温发泡而成,这种材料具有优良的保温性能和整固性,目前,主要用于设施、装置和设备的保温,由于发泡工艺温度应力的影响,这种发泡材料中不可避免的会存在微裂纹和贯穿性孔洞,而且,无机非金属材料还有吸湿性,特别是硅酸盐材料,如果这种材料只在干燥的环境下使用,则这些裂纹和孔洞对产品保温性能没有影响,如果这些材料应用在强腐蚀、有磨损的液态或湿气态的介质工况下,则这些缺陷会大大影响材料的保温效果。
例如,火电厂燃煤机组释放出的烟气经脱硫处理后,烟气的温度降至50℃(或80℃),由于烟气温度低,烟气中会有冷凝液产生,冷凝液中含有不同浓度的硫酸、盐酸、硝酸、氢氟酸和磷酸5种无机酸,具有非常强的腐蚀性,由于烟囱中的烟气大多为微正压运行,所以,这种酸液具有较强的渗透性。从2006年开始,泡沫玻璃砖、泡沫陶瓷砖和胶粘剂防腐体系大量应用于我国火电厂烟囱内壁防腐。在国外,这种烟囱防腐体系具有连续使用25年不损坏的成功事例。作为一种发泡保温材料,在烟囱防腐体系中主要起到以下几种作用:1、保温性。烟气的温度大多为50℃,有的高达80℃,泡沫砖的存在,可以保证泡沫砖底部的胶粘剂长期处在一种较低温度状态下,防止胶粘剂由于温度高而老化加速,胶老化后会脆裂、脱落;2、耐腐蚀性能。泡沫砖一侧直接和烟气接触,烟气冷凝液中含有的强腐蚀性酸液对材料造成一定的腐蚀破坏,3、耐磨性。烟气中含有一定量的粉尘,会对防腐层造成磨损破坏。
但由于泡沫陶瓷砖和泡沫玻璃砖在制造过程中存在的不可避免的微裂纹和贯穿性孔洞等缺陷和硅酸盐材料固有的吸湿性,导致泡沫陶瓷砖、泡沫玻璃砖和胶粘剂防腐层在湿烟囱中运行一段时间后,酸液就会通过微裂纹和贯穿性孔洞渗入泡沫砖,砖体也会吸湿酸液,使酸液逐渐向砖的深度渗透,运行时间越长,泡沫砖吸收的酸液量越大,渗透的深度越深。泡沫砖吸水后,保温性会大大下降,据测试,普通的泡沫砖吸水后保温绝热性能会下降50-60%,这样泡沫砖背面的胶粘剂就会处在一个较高的温度下,从而加速老化。胶粘剂老化后就会脆裂,粘接性大大下降,导致防腐层脱落,防腐功能失效。如果泡沫砖质量较差,经几年运行后,酸液就会浸透泡沫砖到达底部胶粘剂层,腐蚀破坏胶粘剂层后到达烟囱基体,对烟囱基体材料(钢材或混凝土)造成渗透腐蚀破坏,严重时,引起烟囱坍塌。
发明内容
本发明所要解决的技术问题是提供一种提高泡沫砖抗渗性和耐腐蚀性的方法,其克服了现有技术的上述缺点,首次通过改性来提高泡沫陶瓷砖、泡沫玻璃砖等无机非金属固体发泡材料抗渗性能、耐腐蚀性能和耐磨性能的技术。
本发明所要解决的技术问题是通过以下技术方案来实现的:
一种提高泡沫砖抗渗性和耐腐蚀性的方法,包括以下步骤:
(1)清除发泡块材表面的杂质。
(2)将上述发泡块材用处理液浸泡6-9小时后,在100-120℃下烘干。从而提高泡沫砖表面的活性和与树脂或非金属防腐材料的结合强度。
(3)将发泡块材浸在树脂或非金属防腐材料分散液中,通过压力作用,使树脂或非金属防腐材料渗透到发泡块材的微裂纹和微孔中,进而全部填充封堵裂纹和微孔,并包覆在发泡块材表面,固化后形成致密防护层。
(4)经步骤(3)处理后,在泡沫砖表面再涂覆一层树脂或非金属防腐材料以提高树脂层的厚度和抗渗性。
优选地,上述技术方案中,所述发泡块材为泡沫砖。
优选地,上述技术方案中,所述泡沫砖为泡沫陶瓷砖或泡沫玻璃砖。
优选地,上述技术方案中,所述非金属防腐材料为耐酸无机胶泥或塑料粉末悬浮剂。
优选地,上述技术方案中,所述树脂为乙烯基脂树脂、环氧树脂、酚醛树脂、呋喃树脂或不饱和聚酯树脂。
优选地,上述技术方案中,所述步骤(3)中的压力作用为正压和/或负压。
优选地,上述技术方案中,所述步骤(3)中的固化为加热固化和/或加入固化剂固化。
优选地,上述技术方案中,所述步骤(4)还进一步包括:在涂层中进一步加入无机非金属耐磨材料,以提高涂层的耐磨性。
本发明另外提供一种具有抗渗性和耐腐蚀性的泡沫砖产品,其为根据上述的提高泡沫砖抗渗性和耐腐蚀性的方法制备得到的产品。
本发明上述技术方案,具有如下有益效果:
通过本方法处理的泡沫陶瓷砖、泡沫玻璃砖等无机非金属固体泡沫砖,可在具有腐蚀性的液体介质或湿气体介质中长期使用,保证泡沫砖固有的保温性能不会下降,并对泡沫砖的耐腐蚀性能和耐磨性能也会得到一定的提高。
具体实施方式
下面对本发明的具体实施例进行详细描述,以便于进一步理解本发明。
实施例1
(1)、保证发泡块材表面没有粉尘、油污等杂质,如有,清理干净或废弃不用。
(2)、通过处理剂浸泡处理8小时后,在110℃下烘干。
(3)、选择耐腐蚀优良的乙烯基脂树脂,将泡沫砖浸在该树脂中,通过压力作用,使树脂深度渗透到泡沫砖的微裂纹和微孔中,全部填充封堵裂纹和微孔,并包覆在泡沫砖表面,通过加热使其固化;
(4)、经步骤(3)处理后,在泡沫砖表面再涂覆一层乙烯基脂树脂以提高涂覆层的厚度。
实施例2
(1)、保证发泡块材表面没有粉尘、油污等杂质,如有,清理干净或废弃不用。
(2)、通过处理剂浸泡处理8小时后,在110℃下烘干。
(3)、选择耐腐蚀优良的呋喃树脂,将泡沫砖浸在非金属防腐材料分散液中,通过压力作用,使树脂深度渗透到泡沫砖的微裂纹和微孔中,全部填充封堵裂纹和微孔,并包覆在泡沫砖表面,通过加热使其固化。
(4)、经步骤(3)处理后,在泡沫砖表面再涂覆一层呋喃树脂以提高涂覆层的厚度。
(5)、有耐磨要求时,可在涂覆的呋喃树脂层中加入无机非金属耐磨材料来保证长期使用时材料具有可靠的抗渗性和耐腐蚀。
实施例3
(1)、保证发泡块材表面没有粉尘、油污等杂质,如有,清理干净或废弃不用。
(2)、通过处理剂浸泡处理6小时后,在100℃下烘干。
(3)、选择耐腐蚀优良的耐酸无机胶泥,将泡沫砖浸在耐酸无机胶泥分散液中,通过压力作用,使耐酸无机胶泥深度渗透到泡沫砖的微裂纹和微孔中,全部填充封堵裂纹和微孔,并包覆在泡沫砖表面,通过加热使其固化。
(4)、经步骤(3)处理后,在泡沫砖表面再涂覆一层树脂或非金属防腐材料以提高涂覆层的厚度;
(5)、有耐磨要求时,可在涂覆的树脂层中加入无机非金属耐磨材料来保证长期使用时材料具有可靠的抗渗性和耐腐蚀。
实施例4
(1)、保证发泡块材表面没有粉尘、油污等杂质,如有,清理干净或废弃不用。
(2)、通过处理剂浸泡处理9小时后,在120℃下烘干。
(3)、选择耐腐蚀优良的不饱和聚酯树脂,将泡沫砖浸在树脂中,通过压力作用,使树脂深度渗透到泡沫砖的微裂纹和微孔中,全部填充封堵裂纹和微孔,并包覆在泡沫砖表面,通过加入固化剂使其固化。
(4)、经步骤(3)处理后,在泡沫砖表面再涂覆一层树脂或非金属防腐材料以提高涂覆层的厚度;
(5)、有耐磨要求时,可在涂覆的树脂层中加入无机非金属耐磨材料来保证长期使用时材料具有可靠的抗渗性和耐腐蚀。
实施例5
(1)、保证发泡块材表面没有粉尘、油污等杂质,如有,清理干净或废弃不用。
(2)、通过处理剂浸泡处理7小时后,在110℃下烘干。
(3)、选择耐腐蚀优良的酚醛树脂,将泡沫砖浸在树脂中,通过压力作用,使树脂深度渗透到泡沫砖的微裂纹和微孔中,全部填充封堵裂纹和微孔,并包覆在泡沫砖表面,通过加入固化剂使其固化。
(4)、经步骤(3)处理后,在泡沫砖表面再涂覆一层树脂或非金属防腐材料以提高涂覆层的厚度。
(5)、有耐磨要求时,可在涂覆的树脂层中加入无机非金属耐磨材料来保证长期使用时材料具有可靠的抗渗性和耐腐蚀。
通过本方法处理的发泡陶瓷砖、发泡玻璃砖等无机非金属固体发泡材料,可在具有腐蚀性的液体介质或湿气体介质中长期使用,保证发泡材料固有的保温性能不会下降,泡沫砖的耐腐蚀性能和耐磨性能也会得到一定的提高。
虽然本发明已以实施例公开如上,然其并非用于限定本发明,任何本领域技术人员,在不脱离本发明的精神和范围内,均可作各种不同的选择和修改,因此本发明的保护范围由权利要求书及其等同形式所限定。
Claims (8)
1.一种提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,包括以下步骤:
(1)清除发泡块材表面的杂质;
(2)将上述发泡块材用处理液浸泡6-9小时后,在100-120℃下烘干;
(3)将发泡块材浸在树脂或非金属防腐材料分散液中,通过压力作用,使树脂或非金属防腐材料渗透到发泡块材的微裂纹和微孔中,进而全部填充封堵裂纹和微孔,并包覆在发泡块材表面,固化后形成致密防护层;
(4)经步骤(3)处理后,在发泡块材表面再涂覆一层树脂或非金属防腐材料以提高涂层的厚度和抗渗性;
所述发泡块材为泡沫砖。
2.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述泡沫砖为泡沫陶瓷砖或泡沫玻璃砖。
3.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述非金属防腐材料为耐酸无机胶泥或塑料粉末悬浮剂。
4.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述树脂为乙烯基脂树脂、环氧树脂、酚醛树脂、呋喃树脂或不饱和聚酯树脂。
5.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述步骤(3)中的压力作用为正压和/或负压。
6.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述步骤(3)中的固化为加热固化或加入固化剂固化。
7.根据权利要求1所述的提高泡沫砖抗渗性和耐腐蚀性的方法,其特征在于,所述步骤(4)还进一步包括:在涂层中进一步加入无机非金属耐磨材料,以提高涂层的耐磨性。
8.一种具有抗渗性和耐腐蚀性的泡沫砖产品,其特征在于,是根据权利要求1-7任一权利要求所述的提高泡沫砖抗渗性和耐腐蚀性的方法制备得到的产品。
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