CN106318579A - 混凝土脱模剂 - Google Patents
混凝土脱模剂 Download PDFInfo
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Abstract
本发明公开了一种混凝土脱模剂,由以下重量份配比的各组分制成:由以下重量份配比的各组分制成:聚乙烯醇5~9份、硬脂酸3~5份、改性魔芋葡甘聚糖4~8份、魔芋粉10~15份、汉生胶10~15份、硼砂2~4份、蛭石粉3~7份、纳米滑石粉4~6份、甲基硅酸钠4~8份、乙醇15~20份、脂肪酸聚氧乙烯醚1~3份、十二烷基苯磺酸钠1~3份、有机硅消泡剂0.4~0.8份。本发明具有脱模效果佳、强度高、且无污染等优点,是很有发展前途的一种混凝土外加剂。
Description
技术领域
本发明涉及一种混凝土脱模剂,属于混凝土外加剂技术领域。
背景技术
随着混凝土的快速发展,混凝土外加剂在混凝土建筑中的角色也变得越来越重要。其不仅掺量小,而且能改善混凝土性能,满足实际需要,同时还能节约水泥,减少能耗和减少污染物排放等功效。常见的外加剂有:早强剂、减水剂、引气剂、缓凝剂、脱模剂等。其中,混凝土脱模剂,又称混凝土隔离剂或脱模润滑剂,是一种涂覆或喷洒于模板内壁,能产生一层隔离膜,起润滑和隔离作用,同时还能有效减少混凝土与模板之间黏附力,使混凝土在拆模时能顺利脱离模板,保持混凝土形状完整无损的物质。
目前,市场上的混凝土脱模剂种类繁多,不同类型的脱模剂对混凝土与模板之间的脱模效果不尽相同。常见的有:皂类脱模剂、废机油类、植物油类和石蜡类脱模剂。皂类脱模剂虽有造价低廉的优点,但该类脱模剂发酵后,散发出难闻的臭味,污染环境,而且不易脱模,混凝土表面粗糙;废机油类脱模剂虽有造价低廉的优点,但油污易污染施工人员的衣物且脱模后,混凝土表面粗糙,有黑色油污,不易脱模;植物油类脱模剂虽有原料易得的优点,但该类是完全是植物油,直接影响了水泥凝固的效果,容易造成混凝土表面粗糙;蜡油类脱模剂虽有易脱模的优点,但该类是经乳化剂乳化的,乳化剂中含有甲醛等有机挥发性有机溶剂,对人体有伤害,且成本比较高。
中国专利授权公告号:CN103409218B公开了名为“一种混凝土脱模剂及其制备方法”的专利,该脱模剂的原料配方为:水为总质量的80-95%;猪油和松香的质量比为5:1;其余以猪油和松香的总量的100%计,氢氧化钠10-26%;乳化剂10-30%;磷酸三丁酯0.1-1%;甲醛0.2-1.5%;十二烷基甜菜碱0.3-2.2%;适量的有机蒙脱土。虽然其能获得一定的脱模效果,但是其本质上还是皂类脱模剂,仍存在不足,同时在混凝土强度方面还不能令人满意。此外,甲醛的使用,不利于环保。因此,继续探索与研究混凝土脱模剂是必要的。
发明内容
针对上述现有技术中混凝土脱模剂自身缺陷、混凝土强度和环保不足的技术问题,本发明所要解决的技术问题是提出了一种能有效地提高脱模效果和强度,且环保的混凝土脱模剂。
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇5~9份、硬脂酸3~5份、改性魔芋葡甘聚糖4~8份、魔芋粉10~15份、汉生胶10~15份、硼砂2~4份、蛭石粉3~7份、纳米滑石粉4~6份、甲基硅酸钠4~8份、乙醇15~20份、脂肪酸聚氧乙烯醚1~3份、十二烷基苯磺酸钠1~3份、有机硅消泡剂0.4~0.8份。
优选地,
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇7份、硬脂酸4份、改性魔芋葡甘聚糖6份、魔芋粉12份、汉生胶12份、硼砂3份、蛭石粉5份、纳米滑石粉5份、甲基硅酸钠6份、乙醇18份、脂肪酸聚氧乙烯醚2份、十二烷基苯磺酸钠2份、有机硅消泡剂0.6份。
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将3~5份魔芋葡甘聚糖配制成浓度为1~3%的水溶液,并用Ca(OH)2调节pH为值10~11,得到混合物A,备用;
2)将2~4份魔芋葡甘聚糖和0.2~0.4份硬脂酸钠置于50~60℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2~3,反应1~2h;得到混合物B,备用;
3)将5~6份魔芋葡甘聚糖配制成浓度为10~15%的水溶液,并调节pH为值7~8,同时在磁力搅拌状态下,以滴定的方式加入2~4%过氧化氢,40~50℃下恒温水浴氧化3~4h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加2~4%的纳米氧化锌,并置于频率为30~40KHz超声机上超声15~20min,即可得到改性魔芋葡甘聚糖。
优选地,
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将4份魔芋葡甘聚糖配制成浓度为2%的水溶液,并用Ca(OH)2调节pH为值10.5,得到混合物A,备用;
2)将3份魔芋葡甘聚糖和0.3份硬脂酸钠置于55℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2.5,反应1.5h;得到混合物B,备用;
3)将5份魔芋葡甘聚糖配制成浓度为12%的水溶液,并调节pH为值7.5,同时在磁力搅拌状态下,以滴定的方式加入3%过氧化氢,45℃下恒温水浴氧化3.5h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加3%的纳米氧化锌,并置于频率为35KHz超声机上超声18min,即可得到改性魔芋葡甘聚糖。
所述的魔芋粉:汉生胶=1:1。
与现有技术相比,本发明的有益效果是:
1、本发明中以聚乙烯醇、硬脂酸、改性魔芋葡甘聚糖为成膜组分,形成多种膜,增强膜的强度、致密性和稳定性,并牢固粘附于模板及混凝土表面,从而提高脱模效果。同时,通过不同的改性方法改性魔芋葡甘聚糖,使膜的性能进一步改善,从而有助于提高混凝土表面完整性;硬脂酸能与混凝土中钙离子反应生成具有润滑和防水的硬脂酸钙,有助于脱模;
2、魔芋粉和汉生胶复配形成复合凝胶,并包覆在硼砂、蛭石粉和纳米滑石粉的表面。通过硼砂、纳米滑石粉释放和蛭石粉多孔特性,使复合凝胶具有吸附和释放功能,从而有助于提高混凝土脱模剂的脱模效果;
3、甲基硅酸钠具有良好的渗透结晶性和微膨胀性,在乙醇、脂肪酸聚氧乙烯醚和十二烷基苯磺酸钠助剂作用下,渗透混凝土的表面,增加混凝土密实度,提高混凝土的强度。
具体实施方式
本发明提供一种混凝土脱模剂,为达到本发明的目的、技术方案及效果更加清楚、明确,以下对本发明进一步详细说明。
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇5~9份、硬脂酸3~5份、改性魔芋葡甘聚糖4~8份、魔芋粉10~15份、汉生胶10~15份、硼砂2~4份、蛭石粉3~7份、纳米滑石粉4~6份、甲基硅酸钠4~8份、乙醇15~20份、脂肪酸聚氧乙烯醚1~3份、十二烷基苯磺酸钠1~3份、有机硅消泡剂0.4~0.8份;
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将3~5份魔芋葡甘聚糖配制成浓度为1~3%的水溶液,并用Ca(OH)2调节pH为值10~11,得到混合物A,备用;
2)将2~4份魔芋葡甘聚糖和0.2~0.4份硬脂酸钠置于50~60℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2~3,反应1~2h;得到混合物B,备用;
3)将5~6份魔芋葡甘聚糖配制成浓度为10~15%的水溶液,并调节pH为值7~8,同时在磁力搅拌状态下,以滴定的方式加入2~4%过氧化氢,40~50℃下恒温水浴氧化3~4h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加2~4%的纳米氧化锌,并置于频率为30~40KHz超声机上超声15~20min,即可得到改性魔芋葡甘聚糖。
所述的魔芋粉:汉生胶=1:1。
实施例1
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇7份、硬脂酸4份、改性魔芋葡甘聚糖6份、魔芋粉12份、汉生胶12份、硼砂3份、蛭石粉5份、纳米滑石粉5份、甲基硅酸钠6份、乙醇18份、脂肪酸聚氧乙烯醚2份、十二烷基苯磺酸钠2份、有机硅消泡剂0.6份;
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将4份魔芋葡甘聚糖配制成浓度为2%的水溶液,并用Ca(OH)2调节pH为值10.5,得到混合物A,备用;
2)将3份魔芋葡甘聚糖和0.3份硬脂酸钠置于55℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2.5,反应1.5h;得到混合物B,备用;
3)将5份魔芋葡甘聚糖配制成浓度为12%的水溶液,并调节pH为值7.5,同时在磁力搅拌状态下,以滴定的方式加入3%过氧化氢,45℃下恒温水浴氧化3.5h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加3%的纳米氧化锌,并置于频率为35KHz超声机上超声18min,即可得到改性魔芋葡甘聚糖。
实施例2
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇5份、硬脂酸3份、改性魔芋葡甘聚糖4份、魔芋粉10份、汉生胶10份、硼砂2份、蛭石粉3份、纳米滑石粉4份、甲基硅酸钠4份、乙醇15份、脂肪酸聚氧乙烯醚1份、十二烷基苯磺酸钠1份、有机硅消泡剂0.4份;
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将3份魔芋葡甘聚糖配制成浓度为1%的水溶液,并用Ca(OH)2调节pH为值10,得到混合物A,备用;
2)将2份魔芋葡甘聚糖和0.2份硬脂酸钠置于50℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2,反应1h;得到混合物B,备用;
3)将5份魔芋葡甘聚糖配制成浓度为10%的水溶液,并调节pH为值7,同时在磁力搅拌状态下,以滴定的方式加入2%过氧化氢,40℃下恒温水浴氧化3h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加2%的纳米氧化锌,并置于频率为30KHz超声机上超声15min,即可得到改性魔芋葡甘聚糖。
实施例3
一种混凝土脱模剂,由以下重量份配比的各组分制成:聚乙烯醇9份、硬脂酸5份、改性魔芋葡甘聚糖8份、魔芋粉15份、汉生胶15份、硼砂4份、蛭石粉7份、纳米滑石粉6份、甲基硅酸钠8份、乙醇20份、脂肪酸聚氧乙烯醚3份、十二烷基苯磺酸钠3份、有机硅消泡剂0.8份;
所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将5份魔芋葡甘聚糖配制成浓度为3%的水溶液,并用Ca(OH)2调节pH为值11,得到混合物A,备用;
2)将4份魔芋葡甘聚糖和0.4份硬脂酸钠置于60℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值3,反应2h;得到混合物B,备用;
3)将6份魔芋葡甘聚糖配制成浓度为15%的水溶液,并调节pH为值8,同时在磁力搅拌状态下,以滴定的方式加入4%过氧化氢,50℃下恒温水浴氧化4h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加4%的纳米氧化锌,并置于频率为40KHz超声机上超声20min,即可得到改性魔芋葡甘聚糖。
对比例1(对比例1与实施例1的差别仅在于,对比例1中没有添加改性魔芋葡甘聚糖,其余的同实施例1)。
对比例2(对比例2与实施例1的差别仅在于,对比例2中没有添加魔芋粉,其余的同实施例1)。
对比例3(对比例3与实施例1的差别仅在于,对比例3中既没有添加魔芋粉,也没有添加改性魔芋葡甘聚糖,其余的同实施例1)。
将上述实施例1-3、对比例1-3和背景技术(CN103409218B)制得的混凝土脱模剂采用现有技术进行测试,测试结果如下表1所示:
表1混凝土脱模剂测试结果
可以看出,不同参数制备的混凝土脱模剂相对背景技术而言,具有脱模效果佳、强度高、且无污染等优点,是很有发展前途的一种混凝土外加剂。
当然,上面只是本发明优选的具体实施方式作了详细描述,并非以此限制本发明的实施范围,凡依本发明的原理、构造以及结构所作的等效变化,均应涵盖于本发明的保护范围内。
Claims (4)
1.一种混凝土脱模剂,其特征在于:由以下重量份配比的各组分制成:聚乙烯醇5~9份、硬脂酸3~5份、改性魔芋葡甘聚糖4~8份、魔芋粉10~15份、汉生胶10~15份、硼砂2~4份、蛭石粉3~7份、纳米滑石粉4~6份、甲基硅酸钠4~8份、乙醇15~20份、脂肪酸聚氧乙烯醚1~3份、十二烷基苯磺酸钠1~3份、有机硅消泡剂0.4~0.8份;
所述的魔芋粉:汉生胶=1:1。
2.根据权利要求1所述的混凝土脱模剂,其特征在于:由以下重量份配比的各组分制成:聚乙烯醇7份、硬脂酸4份、改性魔芋葡甘聚糖6份、魔芋粉12份、汉生胶12份、硼砂3份、蛭石粉5份、纳米滑石粉5份、甲基硅酸钠6份、乙醇18份、脂肪酸聚氧乙烯醚2份、十二烷基苯磺酸钠2份、有机硅消泡剂0.6份。
3.根据权利要求1所述的混凝土脱模剂,其特征在于:所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将3~5份魔芋葡甘聚糖配制成浓度为1~3%的水溶液,并用Ca(OH)2调节pH为值10~11,得到混合物A,备用;
2)将2~4份魔芋葡甘聚糖和0.2~0.4份硬脂酸钠置于50~60℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2~3,反应1~2h;得到混合物B,备用;
3)将5~6份魔芋葡甘聚糖配制成浓度为10~15%的水溶液,并调节pH为值7~8,同时在磁力搅拌状态下,以滴定的方式加入2~4%过氧化氢,40~50℃下恒温水浴氧化3~4h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加2~4%的纳米氧化锌,并置于频率为30~40KHz超声机上超声15~20min,即可得到改性魔芋葡甘聚糖。
4.根据权利要求1所述的混凝土脱模剂,其特征在于:所述的改性魔芋葡甘聚糖是由以下步骤制得:
1)将4份魔芋葡甘聚糖配制成浓度为2%的水溶液,并用Ca(OH)2调节pH为值10.5,得到混合物A,备用;
2)将3份魔芋葡甘聚糖和0.3份硬脂酸钠置于55℃恒温水浴中,同时在磁力搅拌状态下以滴定方式加入H2SO4调节pH为值2.5,反应1.5h;得到混合物B,备用;
3)将5份魔芋葡甘聚糖配制成浓度为12%的水溶液,并调节pH为值7.5,同时在磁力搅拌状态下,以滴定的方式加入3%过氧化氢,45℃下恒温水浴氧化3.5h,得到混合物C,备用;
4)将混合物A、B、C混合均匀后,加3%的纳米氧化锌,并置于频率为35KHz超声机上超声18min,即可得到改性魔芋葡甘聚糖。
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