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Preparation method of polyurea-type reflective and heat-insulating coating for buildings

A technology for reflective thermal insulation coatings and construction, applied in reflective/signal coatings, polyurea/polyurethane coatings, antifouling/underwater coatings, etc., can solve the problems of poor stain resistance, short service life and low physical properties, Achieve high solids content, long life, good gloss and stain resistance

Active Publication Date: 2021-07-09
山西省建筑科学研究院检测中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in practical applications, reflective heat-insulating coatings for buildings are exposed to the atmosphere and are subjected to sunlight, rain, wind and sand, changes in cold and heat, etc. Therefore, it has been reported that reflective heat-insulating coatings for buildings also have problems such as poor stain resistance , short service life, low physical properties, etc.

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  • Preparation method of polyurea-type reflective and heat-insulating coating for buildings

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preparation example Construction

[0046] The present invention provides a kind of preparation method of reflective heat-insulating coating for polyurea type building, and described preparation method comprises the following steps:

[0047] a) polyetheramine, isophorone diisocyanate and solvent are mixed and reacted, wherein the number of moles of said isophorone diisocyanate is greater than the number of moles of said polyetheramine;

[0048] b) adding a hydrophilic chain extender and a catalyst to the product obtained in step a) and heating to react;

[0049] c) adding triethylamine to the product obtained in step b) and reacting;

[0050] d) adding an aqueous solution of polyamine to the product obtained in step c) and reacting;

[0051] e) removing the solvent from the product obtained in step d) to obtain an aqueous polyurea emulsion;

[0052] f) mixing and dispersing the water-based polyurea emulsion obtained in step e) with a defoamer, a hydrophobic agent, hollow glass microspheres, titanium dioxide an...

Embodiment 1

[0083] Add 27.8 grams of isophorone diisocyanate and 60 grams of acetone into a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a reflux device, and feed nitrogen. 100 g of polyetheramine Jeffamine D-2000 with a functionality of 2 and a molecular weight of 2000 was slowly dropped into the mixture while cooling in a water bath at 5°C, and stirred at 25°C for 0.5 hours after the drop was completed. 5.9 g of 2,2-dimethylolbutyric acid and 0.05 g of dibutyltin dilaurate were added to the above mother liquor, and heated to 70° C. for 2.5 hours to react. Then the reaction system was cooled to 40° C. and 4.2 g of triethylamine was added, and reacted at 40° C. for 15 minutes. An aqueous solution formed of 2.0 g of piperazine and 180 g of deionized water was added to the above mixture for emulsification and chain extension for 10 minutes. Thereafter, the mixture was dispersed in a disperser at a speed of 1000 rpm for 1.0 hour, and the acetone was distill...

Embodiment 2

[0086]Add 27.8 grams of isophorone diisocyanate and 100 grams of ethyl acetate into a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a reflux device, and feed nitrogen. 100 g of polyetheramine Jeffamine T-3000 with a functionality of 3 and a molecular weight of 3000 was slowly added dropwise in a water bath at 0°C, and stirred at 25°C for 0.5 hours after the drop was completed. 7.4 g of 2,2-dimethylolbutyric acid and 0.03 g of stannous octoate were added to the above mother liquor, heated to 75° C. for 2.5 hours to react. Then the reaction system was cooled to 40° C. and 4.5 g of triethylamine was added, and reacted at 40° C. for 15 minutes. An aqueous solution formed of 1.1 g of ethylenediamine and 150 g of deionized water was added to the above mixture for emulsification and chain extension for 10 minutes. Thereafter, the mixture was dispersed in a disperser at a speed of 1000 rpm for 1.0 hour, and ethyl acetate was distilled off under reduce...

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Abstract

The present invention provides a kind of preparation method of polyurea reflective heat insulation coating for building, and this method comprises: a) polyether amine, isophorone diisocyanate and solvent are mixed and reacted, wherein the mole of isophorone diisocyanate The number is greater than the number of moles of polyetheramine; b) adding a hydrophilic chain extender and a catalyst to the product obtained in step a); c) adding triethylamine to the product obtained in step b); d) adding triethylamine to the product obtained in step c) Adding an aqueous solution of polyamine to the obtained product; e) removing the solvent in the product obtained in step d) to obtain an aqueous polyurea emulsion; f) combining the aqueous polyurea emulsion obtained in step e) with an antifoaming agent and a hydrophobic agent , hollow glass microspheres, titanium dioxide and water are mixed and dispersed. According to the technical solution of the present invention, the reflective and heat-insulating coating film for buildings with good stain resistance, long service life and good physical properties can be obtained from the paint prepared by the method of the present invention.

Description

technical field [0001] The invention relates to the field of architectural coatings, in particular to a preparation method of polyurea reflective and heat-insulating coatings for architectural use. Background technique [0002] With the rapid development of my country's economy, energy consumption is also increasing, among which, the energy consumption of buildings is relatively large. With the implementation of the national energy conservation and environmental protection industry policy and the continuous improvement of people's awareness of energy conservation, the research and development and application of building energy conservation have developed rapidly. [0003] In recent years, the external wall insulation market has developed rapidly. Although external wall insulation systems in the form of rock wool boards, polystyrene boards, and polyurethane boards have played a certain role in energy conservation and emission reduction in the construction field, they have gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/02C09D5/33C09D5/16C09D7/61C09D7/65C08G18/75C08G18/66C08G18/50C08G18/34C08G18/32
Inventor 翟现明陈学锋贾迎泽杜世昌
Owner 山西省建筑科学研究院检测中心有限公司
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