On February 12, 2004, the Ministry of Construction announced the industry standard for putty for exterior walls of buildings to regulate its production and use. So in the past two years, many research institutes and manufacturers have developed waterproof formulations with various formulations. High quality putty with high crack resistance and high bond strength. In view of the regulations on energy conservation of civil buildings formulated by the Ministry of Construction in 2000, this paper needs to adopt thermal insulation measures for new houses to reduce building energy consumption, and develop a low dry density, low thermal conductivity, simple ingredients and excellent performance. Insulation putty with low cost and easy construction.
1 Selection of raw materials 1.1 Base organic base material: ROVACEDP-8308 vinyl acetate-ethylene redispersible rubber powder produced by American Rohm and Haas Company, which can improve the adhesion, bonding performance and weather resistance of materials, and reduce materials. Water absorption, and good dispersibility and construction performance.
Inorganic base material: P.042.5 grade cement produced by Hubei Huaxin Cement Co., Ltd., which can be used for the late strength of putty.
1.2 Filling fly ash floating beads: Fly ash floating beads are hollow spherical materials with smooth appearance, the walls are thin and light, usually silver white, silver gray and brown.
The fly ash floating beads used in this experiment are selected in the Class I fly ash discharged from Huaneng (Nantong) Power Plant by flotation method. After drying, the chemical composition and basic properties are shown in Table 1 and Table 2. Wang Gufeng, female, grade engineer at the School of Civil Engineering, Nantong University.
Table 1 Chemical composition of fly ash floating beads Loss of ignition Table 2 Basic properties of fly ash floating beads Screening %/% can be seen from Table 3: As the amount of fly ash float beads increases, the thermal conductivity of putty decreases. That is, the insulation performance of putty increases with the increase of the amount of fly ash float beads. According to the selection principle of engineering insulation materials: the thermal conductivity is not more than 0.23W/(mK), considering the bond strength and construction performance of putty. Therefore, it is determined in the formula that the amount of fly ash float beads is 40%~60%. The basic formula of the insulation putty for building exterior wall has been determined through experiments. See Table 4. Table 4: Raw materials for the insulation powder for exterior wall Name function ratio base material cement base material fly ash floating bead function filler ash calcium powder active filler talcum powder filler water retention polypropylene fiber anti-cracking sodium tripolyphosphate dispersible powder, no sand, no empty drum, no peeling, No oil, no floating ash, no obvious pits.
According to the ratio of powder to water, the ratio of powder to water is about 10:4, and then the mixture is scraped until the sound is applied. When the putty is scraped, it should be noted that the interval between the two putties should not be too short, otherwise the total shrinkage of the two putty films will be caused. The amount increases, causing cracking, squeezing and shelling of the putty film.
The putty should be used according to the amount of construction. The prepared putty cream should be used within 2~3h.
3 product performance indicators 157-2004) industry standards for the performance of putty test, the results are shown in Table 5. Table 5 building exterior wall with M-test performance test results test project requirements test results in the state of the container without agglomeration, uniform construction scraping Painted, unobstructed, hand-grindable, dry time (dry)/h initial dry crack resistance (6h), crack-free water resistance (96h), no abnormal alkali resistance (48h), no abnormal water absorption/bond strength/MPa standard State freeze-thaw cycle (5 times) dynamic anti-cracking/nun base crack 4 Conclusion 2.2 Preparation process The preparation process of thermal insulation putty for exterior wall is as follows: 23 Construction method The base layer should meet the following requirements before construction: leveling, cleaning, building outside The wall insulation putty can be made of fly ash floating beads as a functional filler. The putty produced has a lower dry density than the ordinary putty, and the thermal conductivity is 0.156-0.195W/(m K). The putty contains a large amount of Closed pores, when the putty film is dried, the floating beads can be closely arranged to form a complete hollow insulation layer, which can block the heat flow inside and outside the building and improve the insulation of the building.
China's industrial waste slag emissions are huge, and the current utilization rate can not meet the needs of China's construction. Compared with developed countries, there is also a huge ABS plastic slab. The use of Pu's system Wang Liangliang (Yancheng Institute of Technology Polymer Materials Department 224003 Wang Qin (China) Offshore Oil Construction Chemical Co., Ltd., Hainan Dongfang 572600) is suitable; while under low temperature, low humidity and weak ultraviolet irradiation conditions, the auxiliary resin is the best for l/4s nitrocellulose.
Foreword Plastic special paint is a paint applied on plastic materials. In recent years, plastic materials have been widely used in televisions, computers, automobiles, motorcycle parts, etc., so the coloring decoration and protection of plastic products is indispensable. ABS plastic (acrylonitrile, butadiene and styrene copolymer) is a kind of engineering plastic with wide application, large demand and low price. It has good gloss, easy electroplating, oil resistance, cold resistance and electrical insulation. , with high mechanical strength and good Jia Liangliang, male, lecturer, graduated from the School of Materials Science and Engineering of Nanjing University of Technology in 2004 with a master's degree, is now mainly engaged in the modification of new coatings and polymer materials. Industrial performance, widely used in machinery industry, electrical instrument industry and automotive industry. Often used as gears, dashboards, TV housings, helmets, refrigerator linings, car fenders and handrails. However, ABS plastic is prone to UV degradation. Coating on its surface can overcome UV degradation. At the same time, it can improve the decorativeness of plastic products, or make plastic products have metallic appearance or metallic luster, adjust gloss and make up for surface defects of plastic products. Wait.
There have been some reports on the formulation of coatings with different functions and uses based on thermoplastic acrylic resins, but there are few reports on the use of special coatings for ABS plastics. In this paper, thermoplastic acrylic resin, nitrocellulose (NC) or cellulose acetate butyrate (CAB) is used as raw material, and different additives are used to prepare ABS plastic special paint to meet specific requirements.
gap. Due to the less application of fly ash floating beads, the fly ash floating beads in the fly ash of many power plants are not sorted, resulting in great waste of resources. The development of this product can open up a new road for the effective utilization of fly ash floating beads, and also meets China's basic national policy of focusing on environmental protection, turning harm into profits, and vigorously carrying out comprehensive utilization of waste slag.
(Finish)
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