硅藻土基轻质保温板材的开发

发布时间：2018-01-12 18:08

本文关键词：硅藻土基轻质保温板材的开发　出处：《大连工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：以EPS颗粒为轻骨料,在改性剂的作用下,利用多种矿物辅料对水泥高掺量复掺形成的胶凝料净浆作为无机胶黏剂,混合形成的聚苯颗粒保温料浆,具有良好的机械强度、保温隔热效果等,并且能实现建筑材料生产上的节能与减排。与市场上的EPS类保温板材相比,新型聚苯颗粒保温系统符合了国家建材安全防火标准；在原有基础上,其机械强度等方面性能有所优化提升,在未来的建材市场上将一席之地。本课题在胶凝净浆的基础配比上,提出矿渣、粉煤灰、硅藻土对水泥进行共掺。通过正交试验讨论出粉煤灰基胶凝料净浆的比例,并利用单因素变量分别研究了矿渣、硅藻土对水泥的最佳取代比例。矿物辅料的复掺在一定程度上,优化了无机胶凝料浆的性能,并且有利于工业废弃物的循环再利用。改性剂对聚苯颗粒的改性效果会在极大程度上影响保温板材整体性能。利用聚乙烯醇、可再分散胶粉、硅溶胶作为改性剂分别对聚苯颗粒改性,并辅以适当的改性工艺条件,解决了聚苯颗粒“上浮”的问题,最终提高了保温板材的机械强度。通过单因素变量法确定了各个改性剂对聚苯颗粒的适宜改性剂浓度或比例。通过试验中聚苯颗粒的含量对保温板材的吸水率和导热系数影响效果,确定了聚苯颗粒的最佳掺量。在聚苯颗粒保温板材基本的机械强度基础上,调整聚苯颗粒的掺量,优化保温板材的吸水率和导热系数等性能,使之满足建材产品的行业标准。研究结果表明：在室温下,硅藻土的粒度0.2-0.15mm、矿渣和粉煤灰的粒度小于0.088mm、白灰的粒度为0.3-0.45mm、石膏的粒度为0.3-0.45mm,无机料配比为硅藻土：水泥：矿渣：粉煤灰：白灰：石膏=0.91：2.59：1.4：1：0.38：0.038,聚苯颗粒粒度为2-6mm,掺量为200mL/70g无机料,在1.25%PVA溶液的改性作用下,通过二次分散混合法搅拌2-3min,制得的样品干表观密度为212.35kg/m3,28天抗折强度为0.5MPa,导热系数为0.02363W/(m·K),吸水率为13.6%。
[Abstract]:With EPS particles as lightweight aggregate, under the action of modifiers, cementing of high cement content mixed with the formation of the various mineral materials as inorganic adhesive paste material, polystyrene particles are mixed to form insulation slurry has good mechanical strength, thermal insulation effect, and can achieve energy saving and emission reduction in the building the production of materials. Compared with the market of the class EPS insulation board, polystyrene insulation system in line with the new national building fire safety standards; on the basis of the original, the optimization performance has improved its mechanical strength, in the future the city building materials on the field. This subject is based on a space for one person the cementitious paste. The slag, fly ash, diatomite Co doped on cement. Through orthogonal test on fly ash cementitious material paste proportion, and the single factor variables were taken to study the optimum slag, cement diatomite The proportion of mineral materials. Generation of admixture in a certain extent, optimize the performance of inorganic cementitious slurry, and is conducive to industrial waste recycling. Modification of polystyrene modification effect will affect the overall performance of insulation board in a great extent. The use of polyvinyl alcohol, redispersible powder, silica sol as a modifier of polystyrene particles modified with proper modification conditions, solve the polystyrene particles "float" problem, and ultimately improve the mechanical strength of the insulation board. Each modifier on the appropriate modifier concentration or the proportion of poly benzene particles was determined by the single factor variable method through. The content of polystyrene particles test influence on thermal insulating water absorption rate and thermal conductivity effect, to determine the optimal amount of polystyrene particles. In polystyrene insulation mechanical strength based on the basic plate, adjust the doped polystyrene particles The amount of water absorption, optimization of insulation board and coefficient of thermal conductivity, so as to meet the building materials industry standards. The results show that: at room temperature, the particle size of 0.2-0.15mm diatomite, fly ash and slag particle size less than 0.088mm, lime particle size 0.3-0.45mm, gypsum particle size 0.3-0.45mm, inorganic material ratio of diatomite: cement slag: Fly Ash: Lime gypsum =0.91:2.59:1.4:1:0.38:0.038, polystyrene particle size is 2-6mm, dosage of 200mL/70g inorganic material, in the modification effect of 1.25%PVA solution, by mixing 2-3min two dispersion mixing method, the samples prepared dry apparent density of 212.35kg/m3,28 bending strength 0.5MPa, thermal conductivity is 0.02363W/ (M - K), water absorption rate is 13.6%.

【学位授予单位】：大连工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU551

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