Water-curing environment-friendly type polyurethane waterproofing paint and preparation technique thereof

Abstract

The invention relates to a water firming environment-friendly polyurethane waterproofing paint and the preparing process, in particular to a water firming environment-friendly polyurethane waterproofing paint which can be applied to the damp interface. The invention is prepared by mixing constituent A and constituent B by a certain ratio; the constituent A includes mixed polyether polyols, the weight ratio of which is 60-70 percent; methane diphenyl diisocyanate (MDI), the weight ratio of which is 25-35 percent; plasticizer, and the weight ratio of which is 1-10 percent. The constituent B includes liquid filling, the weight ratio of which is 35-45 percent; inorganic powder filling, the weight ratio of which is 45-55 percent; chemical accessory ingredient, the weight ratio of which is 1-10 percent; and water, the weight ratio of which is 1-10 percent. The paint of the invention uses more environment-friendly material to replace the material in the prior art which is costly and unhealthy, solves the problem that the water firming waterproofing paint in the prior art is difficult to become environment-friendly, simplifies the preparing process, and lowers the production cost.

Description

technical field [0001] The invention relates to a polyurethane waterproof coating and a preparation process thereof. More specifically, the invention relates to a water-curing environment-friendly polyurethane waterproof coating and a preparation process thereof which are applied in the construction field, especially on wet interfaces. Background technique [0002] Polyurethane waterproof coating has the characteristics of water resistance, oil resistance, chemical medium corrosion resistance, high and low temperature resistance, high tensile strength and good ductility. It is considered to be the most excellent waterproof product in the international market at present, and can basically meet the requirements of most waterproof projects. need. [0003] In the prior art, polyurethane waterproof coatings are prepared by mixing and reacting two pre-prepared components in a certain proportion, wherein toluene diisocyanate (TDI) and polyether polyol are us...

AI Technical Summary

Problems solved by technology

However, these fillers and additives seriously pollute the environment and endanger human health.

[0005] Those skilled in the art are also looking for more environmentally friendly and cheaper alternative raw materials, and overcome the performance degradation of the final product and some process difficulties caused by the change of raw materials

[0006] Patent "High Performance Polyurethane Waterproof Coating and Production Process" (public number: CN1952030A), "Research on Environmentally Friendly Polyurethane Architectural Waterproof Coating" published by Dai Yongqing and others ("China Building Waterproof", No. 4, 2002, 19-20 , 26 pages), Yan Yongbin et al. have introduced and adopted water to replace MOCA as curing cross-linking agent Preparation of polyurethane waterproof coatings, and due to technical difficulties, TDI in component A has not been replaced, and industrial safety protection and the health of operators have not been guaranteed in a real sense

[0007] Ren Puliang and others published the paper "The Development of Colored Polyurethane Waterproof Coatings" ("New Building Materials", No. 3, 2005, pages 43-44), which introduced the use of TDI or PAPI (pure MDI and polyfunctional polymeric MDI). mixture) to prepare two-component polyurethane waterproof coating prepolymer, but due to the difficulty of process operation, B component (ie cross-linking component) still adopts MOCA which is carcinogenic and expensive to cure, and B component It needs to be dehydrated at a certain temperature (120°C) and pressure (1.33-2.66kPa) for a period of time, which greatly increases the complexity of the production process

[0008] In short, due to the high requirements of product performance and bottlenecks in the process, TDI and MOCA cannot be replaced by more environmentally friendly raw materials at the same time. The process complexity is too high and the feasibility is small, especially when MOCA is replaced by water, the process complexity is greatly increased Increase