Bicomponent high-strength sprayed polyurethane waterproof paint

A technology for spraying polyurethane and waterproof coatings, applied in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc., can solve problems such as low bonding strength, long construction intervals, and low construction efficiency, and meet the requirements of High performance, high construction efficiency and reliable performance

Inactive Publication Date: 2009-12-23
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these waterproof coatings have the following obvious deficiencies: the construction method is scraping, and due to the long curing time, it is easy to hang when the facade is thickly coated, and it takes multiple constructions to reach the design thickness and the construction interval between coatings is long. The construction efficiency is low; the elongation of the coating film is high but the tensile strength and tear strength are insufficient, and it is easy to be damaged by external forces during the construction process; The junction strength cannot meet the requirements for the use of waterproof materials in national key projects such as high-end buildings and high-speed railways; in addition, ordinary two-component polyurethane waterproof coatings contain organic solvents, which will volatilize during construction, causing environmental pollution and bodily harm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 30.8 parts of MDI-100 and 27.0 parts of MDI-50 into a nitrogen-filled reactor, heat it to 60°C, and drop 42.2 parts of polyether polyol with an equivalent of 1000 into the kettle. ~90°C for 3 hours to obtain component A with an NCO% of 15%. Component B is made of 46 parts of difunctional and trifunctional amino-terminated polyether mixtures, 36 parts of mixed amine chain extenders, 18 parts of pigments and various additives, and is uniformly dispersed by grinding and stirring.

[0028] Components A and B were sprayed with H-20 / 35 main engine and GX-7 spray gun of Gusmer Company of the United States at a volume ratio of 1:1 to form a polyurethane waterproof coating film. The main physical properties of the coating film are shown in Table 1.

[0029] Table 1

[0030] project

Embodiment 2

[0032] Add 59.6 parts of MDI-100 into a nitrogen-filled reaction kettle, heat it to 60°C, add 30.4 parts of polyether polyol with an equivalent of 1000 to the kettle dropwise, and keep warm at 60-90°C for 3 hours, an A component with an NCO% of 16% was obtained. Component B consists of 84 parts of a mixture of ordinary polyether polyols and high-activity polyether polyols, Ethacure 10012 parts, 4 parts of pigments and additives (including 0.1 part of organometallic catalyst) are uniformly dispersed by high-speed stirring.

[0033] Components A and B were sprayed with H-20 / 35 main engine and GX-7 spray gun of Gusmer Company of the United States at a volume ratio of 1:1 to form a polyurethane waterproof coating film. The main physical properties of the coating film are shown in Table 2.

[0034]Table 2

[0035] project

Embodiment 3

[0037] Add 78 parts of MDI and LMDI into a nitrogen-filled reaction kettle, heat it to 60°C, add 22 parts of polyether polyols with an equivalent of 2000 to the kettle dropwise, and keep warm at 60-90°C for 3 Hours, an A component with an NCO% of 18% was obtained. Component B consists of 70 parts of a mixture of D-2000 and high activity polyether polyol, 15 parts of 1,4-butanediol, Ethacure 1005 parts, 10 parts of pigments and additives (including 0.3 parts of catalyst triethylenediamine, 2 parts of leveling agent, 1 part of antioxidant and ultraviolet light absorber) are uniformly dispersed by high-speed stirring.

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PUM

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Abstract

The invention provides bicomponent high-strength sprayed polyurethane waterproof paint. The paint consists of a component A and a component B according to the volume ratio of 1 to 1, wherein the component A is a semi-prepolymer synthesized by polyisocyanate with low functionality and polyether glycol; according to weight portion, the component A comprises 50 to 80 portions of the polyisocyanate with functionality of between 2.0 and 2.4 and 20 to 50 portions of the polyether glycol with functionality of between 2 and 4; and the component B comprises 40 to 84 portions of the polyether polyol or amino-terminated polyether or mixture of the polyether polyol and the amino-terminated polyether, 10 to 40 portions of amine chain extender or alcohol chain extender or mixture of the amine chain extender or the alcohol chain extender and 0 to 20 portions of pigment filler and additive. The bicomponent high-strength sprayed polyurethane waterproof paint has mechanical performance close to or even higher than that of a waterproof coiled material, adopts a spraying construction method, is convenient and high-efficient and greatly prolongs the service life of the waterproof material; and a solvent-free system also greatly ensures the environment-friendly requirement of the material, so that the performance is more reliable, high efficient and environment-friendly. Compared with a conventional waterproof material, the bicomponent high-strength sprayed polyurethane waterproof paint has high strength and elongation rate.

Description

technical field [0001] The invention relates to a polyurethane waterproof coating, in particular to a two-component high-strength sprayed polyurethane waterproof coating, which can be used for waterproofing projects of various buildings (structures). Background technique [0002] In the field of waterproofing of buildings (structures), there are mainly two types of materials, coiled materials and coatings. The disadvantages of coiled material construction are that the moisture content of the base layer is high, and it is difficult to lay the base layer when the shape of the base layer is complex, and the splicing of multiple pieces will affect the appearance; in addition, there are many joints in the coiled material and the joints are not tight, which will easily cause water to flow through, and eventually leakage will occur. Maintenance after water leakage is also a problem; moreover, the performance of domestic supporting adhesives is poor, and the construction quality is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D5/16B05D1/02
Inventor 赵希娟刘彦东潘美郑旗王强王炜
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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