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蛋白质类发泡剂的合成及其泡沫稳定性 总被引:1,自引:0,他引:1
以牛蹄角为主要蛋白质原料,在适量Ca(OH)2和少量NaHSO3存在的条件下,成功地合成出蛋白质型泡沫混凝土用发泡剂,并就几种表面活性物质和胶状物质对该发泡剂制得的泡沫稳定性的改性效果进行了研究。实验结果表明,添加的3种物质对该发泡剂的泡沫稳定性均有不同程度的改善,其中烷基苯磺酸盐的改善作用最明显,当改性剂在发泡液中的添加量为6.7 g/L时,发泡倍数为16.7,泡沫稳定时间大于3 h。 相似文献
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以松香型发泡剂为基体,系统地考察了十二烷基硫酸钠、低碳链脂肪醇和粘性物质(羧甲基纤维素钠)的添加对发泡液的发泡倍数和泡沫稳定性的影响。实验结果表明,在松香型发泡剂中分别掺加三种低碳链脂肪醇均能有效地提高泡沫的稳定性,其中正丁醇的效果最好,1h泌水率由原来的37%下降到22.4%,而十二烷基硫酸钠的效果最差,不利于稳定性的改进。对于这三种低碳链脂肪醇,相同掺量的情况下,泡沫稳定性随着脂肪醇碳链长度的增加而提高。与粘性物质羧甲基纤维素钠进行复配时,在6%发泡剂稀释液中掺加0.16%正丁醇和0.01%羧甲基纤维素钠,发泡和稳泡效果最好,发泡倍数达到27.33,1h泌水率仅为16.23%。 相似文献
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菜籽粕蛋白质混凝土发泡剂的制备及性能 总被引:1,自引:1,他引:0
以菜籽粕为原料,采用氢氧化钠、乙醇、硫酸铵提取的菜籽粕蛋白质溶液与水以体积比2∶1混合作基液,分别掺入一定量不同类型的表面活性剂进行复配,制备蛋白质类混凝土发泡剂。通过测定复配体系的发泡高度和稳泡时间优化复配方案,并测定复配前后泡沫性能最优时试样的表面张力和黏度。结果表明,在乙醇提取液中掺入3.0 g/L SDS+0.5 g/L CTAB+2.0 g/L SDBS进行复配时增效作用最好,发泡高度达110 mm,稳泡时间47h。复配后发泡剂的表面张力由43.47 mN/m降低到25.75 mN/m,黏度由4.20 mPa.s增加到4.50 mPa.s。通过对比表明,复配发泡剂的性能在发泡性和稳泡性方面已经超过某些市售发泡剂。 相似文献
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主要介绍了泡沫混凝土发泡剂的研究应用现状,着重对表面活性剂类发泡剂和蛋白质类发泡剂的研究进展进行了总结。并对发泡剂的发展趋势进行了展望。 相似文献
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MM Al Bakri Abdullah K Hussin M Bnhussain KN Ismail Z Yahya RA Razak 《International journal of molecular sciences》2012,13(6):7186-7198
In this paper, we report the results of our investigation on the possibility of producing foam concrete by using a geopolymer system. Class C fly ash was mixed with an alkaline activator solution (a mixture of sodium silicate and NaOH), and foam was added to the geopolymeric mixture to produce lightweight concrete. The NaOH solution was prepared by dilute NaOH pellets with distilled water. The reactives were mixed to produce a homogeneous mixture, which was placed into a 50 mm mold and cured at two different curing temperatures (60 °C and room temperature), for 24 hours. After the curing process, the strengths of the samples were tested on days 1, 7, and 28. The water absorption, porosity, chemical composition, microstructure, XRD and FTIR analyses were studied. The results showed that the sample which was cured at 60 °C (LW2) produced the maximum compressive strength for all tests, (11.03 MPa, 17.59 MPa, and 18.19 MPa) for days 1, 7, and 28, respectively. Also, the water absorption and porosity of LW2 were reduced by 6.78% and 1.22% after 28 days, respectively. The SEM showed that the LW2 sample had a denser matrix than LW1. This was because LW2 was heat cured, which caused the geopolymerization rate to increase, producing a denser matrix. However for LW1, microcracks were present on the surface, which reduced the compressive strength and increased water absorption and porosity. 相似文献
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为提高发泡剂的性能,分别选用十二烷基硫酸钠(SDS)、α-烯基磺酸钠(AOS)和动物蛋白发泡剂(APFA)为研究对象.先通过正交试验,获得最佳制泡条件;再通过复配试验,获得最佳制备复配发泡剂方案为:SDS与APFA的质量比为0.67:1,搅拌温度为45℃,搅拌时间为7 min;进一步将最佳复配发泡剂用于泡沫混凝土.结果表明,SDS-APFA复配发泡剂具有较高的发泡性能,其发泡倍数高达50,1 h泌水量为0.152 mL.该复配发泡剂用于混凝土使其导热系数明显降低,有效地改善了混凝土的保温性能. 相似文献