CN113441376B - 一种环氧聚合物改性水泥砂浆涂装工艺 - Google Patents

一种环氧聚合物改性水泥砂浆涂装工艺 Download PDF

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CN113441376B
CN113441376B CN202110901292.6A CN202110901292A CN113441376B CN 113441376 B CN113441376 B CN 113441376B CN 202110901292 A CN202110901292 A CN 202110901292A CN 113441376 B CN113441376 B CN 113441376B
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coating
cellulose
cement
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谢祥明
姚楚康
赵雅玲
李娜娜
郑莉
黄红梅
钟哲
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Guangdong No 2 Hydropower Engineering Co Ltd
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Abstract

本发明一种环氧聚合物改性水泥砂浆涂装工艺,涉及建筑工程技术领域。包括以下步骤:(1)表面清理;(2)在钢管表面刮涂聚脲涂料;(3)钢管加热;(4)涂覆环氧聚合物改性水泥砂浆中间层;(5)涂覆环氧聚合物改性水泥砂浆面层;(6)水冷降温。本发明通过三层涂刷工艺,将改性水泥砂浆用于内衬钢管外壁防腐,附着力增强,渗透系数降低,提高防腐涂层的使用寿命,满足大型工程的要求,最大程度降低了成本缩短工期,同时外层耐磨性能极高,便于运输。

Description

一种环氧聚合物改性水泥砂浆涂装工艺
技术领域
本发明涉及建筑工程技术领域,具体涉及一种环氧聚合物改性水泥砂浆涂装工艺。
背景技术
随着交通、水运技术的发展,尤其沿海各省很多建筑物需要采用钢管桩作为沉桩或平台基础,由于海域处环境腐蚀条件非常恶劣,地下水和海水对钢管桩具有化学性侵蚀,台风、寒流袭击海面产生的大浪急流以巨大波浪力和水流携带高沙量的水体对钢管桩表面产生强大外力的冲击、摩擦和划伤,对钢管桩表面具有灾害性的侵蚀,而大多数大工程的设计寿命要求很高,要求达到100年,所以钢管桩加工工程中,首先必需对钢管进行外防腐处理,从防腐涂料和涂敷工艺上进行改进。
普通的水泥基复合材料,如普通混凝土或水泥砂浆是非均质、多项无机脆性材料,而且这种多孔材料在外界侵蚀性介质如二氧化碳、水、氯离子、硫酸盐等侵蚀作用下,会加速破坏,使用寿命大大缩短。加入聚合物材料后,水泥基材料的许多性能如强度、变形能力、粘结性能、防水性能、耐久性能等都会有所改善,改善程度与聚灰比、聚合物的种类和性能等有很大关系。目前,聚合物改性砂浆和混凝土不仅在混凝土结构的修补和维护方面应用技术较为成熟,就是在新的建筑中也多有涉及,尤其是桥面、停车场、码头、瓷砖和石材粘结、建筑防水、防腐等工程领域。
例如中国专利申请201610919026.5中公开一种聚合物改性水泥修补砂浆的制备方法,该发明将十二烷基硫酸钠,脂肪醇聚氧乙烯醚等加热反应后再与丙烯酸丁酯、甲基丙烯酸环氧丙酯等混合,并滴加过硫酸铵溶液,待反应完全后,过滤出料,制得丙烯酸酯聚合物乳液,再将其与乙烯-醋酸乙烯共聚物乳液按比例配制成混合乳液,同时按比例将普通硅酸盐水泥,石英砂,胶粉,聚丙烯纤维丝等配置成混合粉料,最后将混合粉料,混合乳液与去离子水搅拌均匀,出料,即得聚合物改性水泥修补砂浆。该发明通过丙烯酸酯聚合物乳液与乙烯-醋酸乙烯共聚物乳液复配,来提高混合乳液的耐久性与粘结性,再通过添加聚丙烯纤维丝,胶粉等提高砂浆的力学性能。
然而,除了涂料本身性能,涂装工艺也对钢管性能影响很大。钢管外防腐用环氧聚合物改性水泥砂浆涂层的设计厚度一般不超过1000μm(1mm),涂层连续性、均匀性等喷涂质量的控制,不仅影响施工成本,而且对钢管的整体性能影响很大。有鉴于此,本申请提供一种环氧聚合物改性水泥砂浆涂装工艺,通过涂装工艺的优化,提高喷涂施工质量,确保涂层整体强度和防腐性能,并加强运输、施工过程防腐层的保护。
发明内容
本发明的目的是提供一种环氧聚合物改性水泥砂浆涂装工艺,提高涂层附着力、渗透系数等防护性能,节省工期和成本。
为实现上述发明目的,本发明的技术方案如下:
一种环氧聚合物改性水泥砂浆涂装工艺,包括以下步骤:
(1)表面清理;
(2)在钢管表面刮涂聚脲涂料;
(3)钢管加热;
(4)涂覆环氧聚合物改性水泥砂浆中间层;
(5)涂覆环氧聚合物改性水泥砂浆面层;
(6)水冷降温。
其中,中间层由双酚A环氧树脂、酚醛环氧树脂、固化剂、水泥、砂子、润湿剂、消泡剂、分散剂组成;面层由双酚A环氧树脂、异辛基酸性硫磷脂十八胺、固化剂、水泥、润湿剂、消泡剂、分散剂组成。
优选的,步骤(1)中,所述表面清理包括除锈和除尘。例如,除锈可选用抛丸除锈,将钢管表面的氧化皮彻底清除干净;除尘可选用专业除尘器。
优选的,步骤(2)中,聚脲涂料刮涂厚度为50-200μm,进一步优选100μm。
优选的,步骤(3)中,加热的温度为100-160℃,进一步优选为120℃。
优选的,步骤(4)中,所述中间层由60-80份双酚A环氧树脂、10-25份酚醛环氧树脂、30-50份固化剂、30-50份水泥、15-30份砂子、3-10份润湿剂、5-12份消泡剂、5-12份分散剂组成;进一步优选的,中间层由72份双酚A环氧树脂、18份酚醛环氧树脂、42份固化剂、40份水泥、20份砂子、6份润湿剂、8份消泡剂、8份分散剂组成。
优选的,步骤(4)中,所述中间层的涂覆厚度为500-700μm,进一步优选600μm。
优选的,步骤(5)中,所述面层中,双酚A环氧树脂和异辛基酸性硫磷脂十八胺的重量比为10:1。进一步优选的,所述面层由40-70份双酚A环氧树脂、1-10份异辛基酸性硫磷脂十八胺、20-40份固化剂、30-50份水泥、3-10份润湿剂、5-12份消泡剂、5-12份分散剂组成。更进一步优选的,所述面层由50份双酚A环氧树脂、5份异辛基酸性硫磷脂十八胺、24份固化剂、35份水泥、5份润湿剂、6份消泡剂、6份分散剂组成。
优选的,步骤(5)中,所述面层的涂覆厚度为200-400μm,进一步优选为300μm。
优选的,步骤(4)或(5)中,所述水泥为普通硅酸盐水泥。
优选的,步骤(4)或(5)中,所述砂子粒径0.25-0.35mm。
优选的,步骤(4)或(5)中,所述固化剂为四氢邻苯二甲酸酐和邻苯二甲酸酐的混合物,所述的四氢邻苯二甲酸酐和邻苯二甲酸酐的质量比为1:1-2,最优选为1:2。
优选的,步骤(4)或(5)中,所述润湿剂为聚氧乙烯烷基酚醚。
优选的,步骤(4)或(5)中,所述消泡剂为聚二甲硅氧烷和二氧化硅的混合物,两者的质量比为2:3。
优选的,步骤(4)或(5)中,所述分散剂选自纤维素乙酸酯、纤维素乙酸丁酸酯、甲基纤维素、羧甲基纤维素、乙基纤维素、羟乙基纤维素、羟丙基纤维素和羟丙基甲基纤维素中的至少一种,进一步优选为纤维素乙酸酯或/和纤维素乙酸丁酸酯。
本发明的有益效果为:
(1)本发明通过三层涂刷工艺,将改性水泥砂浆用于内衬钢管外壁防腐,附着力增强,渗透系数降低,提高防腐涂层的使用寿命,满足大型工程的要求。
(2)本发明通过合理选材,施工快,最大程度降低了成本缩短工期,同时外层耐磨性能极高,便于运输。
附图说明
图1为本发明实施例涂层结构示意图。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体实施例,进一步阐明本发明,但下述实施例仅为本发明的优选实施例,并非全部。基于实施方式中的实施例,本领域技术人员在没有做出创造性劳动的前提下所获得其它实施例,都属于本发明的保护范围。下述实施例中,若无特殊说明,所用的操作方法均为常规操作方法,所用设备均为常规设备,各个实施例所用设备材料均相同。
下述实施例中,聚脲涂料为上泰科技(货号01)的聚脲涂料,双酚A环氧树脂为万青TC-K51,酚醛环氧树脂为对叔丁基苯酚甲醛树脂、所用水泥为普通硅酸盐水泥,所用砂子粒径0.25-0.35mm,所用消泡剂为聚二甲硅氧烷和二氧化硅的混合物,两者的质量比为2:3,所用分散剂为纤维素乙酸酯,所用润湿剂为聚氧乙烯烷基酚醚。
测试指标和方法如下表所示,测试膜片均按照本申请涂覆方法涂覆,厚度1mm。
表1.
Figure BDA0003199951120000041
Figure BDA0003199951120000051
实施例
下述实施例均按照以下步骤进行:
(1)用燃烧器经风机热循环对钢管表面预热至40-45℃,抛丸除锈,将钢管表面的氧化皮彻底清除干净,除锈等级达到Sa 2.5级,然后用工业除尘器清除钢管表面灰尘,灰尘评定达到2级以上质量;
(2)在钢管表面刮涂聚脲涂料,厚度为100μm;
(3)采用线圈涡流感应加热钢管,温度维持在120±5℃;
(4)刮涂环氧聚合物改性水泥砂浆中间层,厚度600μm;
(5)在中间层干透前刮涂环氧聚合物改性水泥砂浆面层,300μm;
(6)用冷却水对钢管进行降温。
其中,环氧聚合物改性水泥砂浆中间层制备方法:
(1)将配方用量的双酚A环氧树脂、酚醛环氧树脂和固化剂混合后以200r/min的搅拌速度,搅拌30分钟,得环氧树脂乳液;
(2)将水泥、砂子、润湿剂、消泡剂和分散剂混合后加水以500r/min的速度搅拌15分钟,得混合物;然后将步骤(1)中得到的环氧树脂乳液加入混合物中以50r/min的速度搅拌30分钟,得到所述的改性水泥砂浆中间层。
环氧聚合物改性水泥砂浆面层制备方法:
(1)将配方用量的双酚A环氧树脂和固化剂混合后以200r/min的搅拌速度,搅拌30分钟,得环氧树脂乳液;
(2)将水泥、异辛基酸性硫磷脂十八胺、润湿剂、消泡剂和分散剂混合后加水以500r/min的速度搅拌15分钟,得混合物;然后将步骤(1)中得到的环氧树脂乳液加入混合物中以50r/min的速度搅拌30分钟,得到所述的改性水泥砂浆面层。
实施例1-5中间层筛选
实施例1-5的面层由50双酚A环氧树脂、5份异辛基酸性硫磷脂十八胺、25份固化剂、35份水泥、5份润湿剂、6份消泡剂、6份分散剂组成。
实施例1-5的中间层砂浆配方如下表所示:
表2.
Figure BDA0003199951120000061
结果检测
表3.
Figure BDA0003199951120000062
Figure BDA0003199951120000071
注:○代表平整光滑、无开裂、气泡、软化、剥离等;△代表轻微存在开裂、气泡、软化或剥离等;×代表明显存在表面缺陷。
可以看出,实施例1-5均满足生产要求,附着力、耐腐蚀、抗渗性能、耐磨性等都较佳,同时实施例1的中间层整体抗拉性能和抗渗性能优于其他实施例。
实施例6-9
中间层与实施例1相同,面层如下表:
表4.
Figure BDA0003199951120000072
结果检测
表5.
Figure BDA0003199951120000073
Figure BDA0003199951120000081
注:○代表平整光滑、无开裂、气泡、软化、剥离等;△代表轻微存在开裂、气泡、软化或剥离等;×代表明显存在表面缺陷。
对比例1
刮涂聚脲后,刮涂实施例6面层900μm,不涂覆中间层,其余不变。
对比例2
刮涂聚脲后,刮涂实施例1中间层900μm,不涂覆面层,其余不变。
对比例3
与实施例6不同的是,省略步骤(2),不刮涂聚脲,其余不变。
对比例4
与实施例6不同的是,不添加异辛基酸性硫磷脂十八胺,其余不变。
结果检测
表6.
Figure BDA0003199951120000082
注:○代表平整光滑、无开裂、气泡、软化、剥离等;△代表轻微存在开裂、气泡、软化或剥离等;×代表明显存在表面缺陷。
上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (7)

1.一种环氧聚合物改性水泥砂浆涂装工艺,其特征在于,包括以下步骤:
(1)表面清理;
(2)在钢管表面刮涂聚脲涂料,聚脲涂料刮涂厚度为50-200μm;
(3)钢管加热;
(4)涂覆环氧聚合物改性水泥砂浆中间层,中间层的涂覆厚度为500-700μm,中间层由60-80份双酚A环氧树脂、10-25份酚醛环氧树脂、30-50份固化剂、30-50份水泥、15-30份砂子、3-10份润湿剂、5-12份消泡剂、5-12份分散剂组成;
(5)涂覆环氧聚合物改性水泥砂浆面层,面层的涂覆厚度为200-400μm,面层由40-70份双酚A环氧树脂、1-10份异辛基酸性硫磷脂十八胺、20-40份固化剂、30-50份水泥、3-10份润湿剂、5-12份消泡剂、5-12份分散剂组成;
(6)水冷降温,
其中,所述固化剂为四氢邻苯二甲酸酐和邻苯二甲酸酐的混合物,四氢邻苯二甲酸酐和邻苯二甲酸酐的质量比为1:1-2。
2.根据权利要求1所述的涂装工艺,其特征在于,步骤(3)中,加热的温度为100-160℃。
3.根据权利要求1所述的涂装工艺,其特征在于,步骤(4)中,中间层由72份双酚A环氧树脂、18份酚醛环氧树脂、42份固化剂、40份水泥、20份砂子、6份润湿剂、8份消泡剂、8份分散剂组成。
4.根据权利要求1所述的涂装工艺,其特征在于,步骤(5)中,所述面层中,双酚A环氧树脂和异辛基酸性硫磷脂十八胺的重量比为10:1。
5.根据权利要求1所述的涂装工艺,其特征在于,步骤(5)中,所述面层由50份双酚A环氧树脂、5份异辛基酸性硫磷脂十八胺、24份固化剂、35份水泥、5份润湿剂、6份消泡剂、6份分散剂组成。
6.根据权利要求1所述的涂装工艺,其特征在于,步骤(4)中,所述水泥为普通硅酸盐水泥,所述砂子粒径0.25-0.35mm,所述润湿剂为聚氧乙烯烷基酚醚,所述消泡剂为聚二甲硅氧烷和二氧化硅的混合物,两者的质量比为2:3,所述分散剂选自纤维素乙酸酯、纤维素乙酸丁酸酯、甲基纤维素、羧甲基纤维素、乙基纤维素、羟乙基纤维素、羟丙基纤维素和羟丙基甲基纤维素中的至少一种。
7.根据权利要求1所述的涂装工艺,其特征在于,步骤(5)中,所述水泥为普通硅酸盐水泥,所述润湿剂为聚氧乙烯烷基酚醚,所述消泡剂为聚二甲硅氧烷和二氧化硅的混合物,两者的质量比为2:3,所述分散剂选自纤维素乙酸酯、纤维素乙酸丁酸酯、甲基纤维素、羧甲基纤维素、乙基纤维素、羟乙基纤维素、羟丙基纤维素和羟丙基甲基纤维素中的至少一种。
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