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The Adhesive Preparation for External Thermal Insulation Systems Based on EPS

Author: WuZhengJun
Tutor: JiangDengGao
School: Zhengzhou University
Course: Chemical processes
Keywords: Exterior insulation Adhesive Core-shell structure Vinyl acetate
CLC: TQ433.43
Type: Master's thesis
Year: 2008
Downloads: 22
Quote: 0
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Abstract


With the continuous improvement of the looming energy crisis and environmental protection awareness , building energy efficiency issues and more attention. Expanded polystyrene board exterior insulation system as a mainstream building energy efficiency measures and get a wide range of applications , including the adhesive bonding polystyrene board with grassroots wall is the system to use a key to the safety and durability . \using pre-emulsified semi-continuous seed emulsion polymerization prepared by a \Adhesive in accordance with national standards JG149 - 2003 \. The factors affecting the stability of the pre-emulsion was studied. Orthogonal experimental design of five factors and four levels the system to better pre-emulsification process conditions : 4% of the amount of emulsifier , pre-emulsification temperature 30 ° C , the monomer addition time of 30min , stirrer rate 560r/min , stirring time 25min. Simultaneously one of the significant factors affecting the core-shell structure of the shell monomer pre-emulsion hunger state droplet acceleration measured results show that the present system under the shell pre-emulsion droplet acceleration 23.75g / h satisfy hunger state added dropwise . Experiment the various parameters that affect performance and film forming properties of the polymer emulsion in the emulsion polymerization process was investigated to obtain optimum conditions : the reaction temperature was 78 ° C ; amount of emulsifier is from 4% ; emulsifier ratio by SDS : OP-10 = 3:2; 0.4% of the amount of initiator ; core-shell ratio of 8:2 ; 3% of the amount of functional monomer acrylic . Under this condition, the polymerization process is stable, the resulting emulsion was milky white and delicate , the good film forming properties at room temperature , and good water resistance and alkali resistance . In this paper, infrared spectroscopy , dynamic mechanical analysis (DMA) , and particle size analysis and other means were used to characterize the morphology of polymer emulsion particles , the results show that : the prepared emulsion adhesive has two glass transition temperature , and composite particles the particle size significantly larger than the particle diameter of the nuclear layers , confirmed the presence of a core-shell structure .

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CLC: > Industrial Technology > Chemical Industry > Adhesive Industry > Synthetic adhesive > Rubber, resin as raw material adhesive > Synthetic resin adhesive of the raw materials
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