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Development and Application of MDI -based polyurethane waterproof coating

Author: DaiYuePing
Tutor: ZhangHongDong
School: Fudan University
Course: Chemical Engineering
Keywords: MDI Polyurethane Waterproofing
CLC: TQ637
Type: Master's thesis
Year: 2011
Downloads: 426
Quote: 0
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Abstract


Polyurethane waterproofing coating is a main type of material for construction waterproofing. Typical PU waterproofing coating is made by TDI with polyether polyol, problems caused by this are heath risk for people, environment pollution and poor property.The PU waterproofing coating stated by this paper is made by MDI with different polyol and polyamine, and combined with chain extender to make a high solid content, environment friendly and high performance coating. It can be used for different constructions like roofing, basement and bathroom etc. This includes MDI primer, 1K and 2K PU waterproofing coating and 2K spray polyurea.This paper will focus on both different product and system formulation to discuss the results of different MDI and its variants through commercialized MDI products.Main studies were implemented through physical testing and chemical analysis to pay attention on influence of water content, potlife, prepolymer, filler, chain extender and polyol.MDI prepolymers are made for 1K and 2K PU waterproofing coatings. Polyols for making prepolymers are polyether polyols, with 2-3 functionality and molecular weight is between 400 and 4000. And in 2K system formulations, chain extenders are used to enhance physical property, like glycerol, BDO and other amines. And for polyurea, jeffamines are used to react with MDI to achieve final high performance.

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