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Environmental-friendly two-component polyurethane waterproof coating and preparation method thereof
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A two-component polyurethane and waterproof coating technology, applied in the field of polyurethane, can solve the problems of high organic volatiles, non-environmental protection, and low solid content
Inactive Publication Date: 2014-06-04
SHANGHAI DONGDA CHEM
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[0006] The technical problem to be solved by the present invention is to overcome the defects of low solid content, high organic volatile matter and non-environmental protection of the existing two-component polyurethane waterproof coating, and to provide an environmentally friendly two-component polyurethane waterproof coating and its preparation method
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[0034] Add polyether polyol N220, polyether polyol N330 and dipropylene glycol to the reactor at room temperature, raise the temperature to 100°C under stirring, vacuumize and dehydrate and degas for 2 hours until the moisture content is less than 5 / 10,000, then cool down to 30°C Add diphenylmethane diisocyanate and polymerization inhibitor at ℃, react at 80℃ for 3 hours, cool down to 30℃, and pack into barrels;
[0035] Prepare B component:
[0036] The raw materials of component B are: 20% polyether polyol N220, 5% curing agent (dimethylthiotoluenediamine), 20% talc, 24.5% plasticizer (tributyl citrate) and 0.5% catalyst Triethylenediamine;
[0037] Put polyether polyol N220, plasticizer, filler and curing agent into the reaction ...
Embodiment 2
[0040] Prepare component A:
[0041] The raw materials of component A are 33% polyether polyol N220, 20% polyether polyol N330, 5% 1,4-butanediol (relative molecular weight 90.12), 42% isocyanate PM200 and 10ppm inhibitor (phosphoric acid);
[0042] Add polyether polyol N220, polyether polyol N330 and 1,4-butanediol to the reaction kettle at room temperature, raise the temperature to 80°C under stirring, vacuumize and dehydrate and degas for 3 hours, until the moisture content is less than 1 / 10,000 5. Cool down to 40°C, add MDI-50 and polymerization inhibitor, react at 85°C for 2.5 hours, cool down to 40°C, and load into barrels;
[0043] Prepare B component:
[0044] The raw materials of component B are: 15% polyether polyol N220, 7% curing agent (2,4-diamino-3,5-dimethylthiochlorobenzene), 40% calciumcarbonate, 37% plasticizer (trioctyl acetyl citrate) and 1% catalyst triethylenediamine;
[0045] Put polyether polyol N220, plasticizer, filler and curing agent into the reac...
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Abstract
The invention discloses an environmental-friendly two-component polyurethane waterproof coating and a preparation method thereof. The environmental-friendly two-component polyurethane waterproof coating is prepared from components A and B; the component A comprises the following materials in percentage by weight: 10%-40% of polyether glycol N220, 20%-50% of polyether glycol N330, 1%-10% of dihydric alcohol, 10%-65% of isocyanate and 10 ppm of polymerization inhibitors, wherein the isocyanate is one or more than one of MDI (Diphenyl-Methane-Diisocyanate), MDI-50 and polymerized MDI; the component B comprises the following materials in percentage by weight: 10%-30% of the polyether glycol N220, 1%-20% of curing agents, 20%-50% of fillers, 10%-40% of plasticizing agents and 0.1%-2.0% of catalyst; the weight ratio of the component A to the component B is 1:2.3-1:2.8. The environmental-friendly two-component polyurethane waterproof coating disclosed by the invention can completely meet the requirement for standard of a waterproof coating used for a railway bridge in property without volatilizing a solvent or generating pungent smell or causing pollution and harmfulness to builders and a surrounding environment.
Description
technical field [0001] The invention relates to the field of polyurethane, in particular to an environment-friendly two-component polyurethane waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane coatings were first industrialized in Germany in the 1940s. In the 1960s, all countries put into production one after another, and developed varieties of polyurethane coatings. The polyurethane waterproof material was developed during this period. The first two-component polyurethane waterproof material was made by the American Tire Rubber Company. Through a large number of construction applications, good results were obtained. [0003] Our country gradually understands polyurethane waterproof materials. In 1989, the Ministry of Construction conducted a rectification and investigation on the national waterproof material market, and confirmed that polyurethane waterproof coatings are credible waterproof materials. In 1990, the Ministry of Co...
Claims
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Application Information
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