CN111154356A - Polyurethane modified heat-insulating coating and preparation method thereof - Google Patents

Polyurethane modified heat-insulating coating and preparation method thereof Download PDF

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CN111154356A
CN111154356A CN202010050888.5A CN202010050888A CN111154356A CN 111154356 A CN111154356 A CN 111154356A CN 202010050888 A CN202010050888 A CN 202010050888A CN 111154356 A CN111154356 A CN 111154356A
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polyurethane
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coating
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CN111154356B (en
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谭建军
李雪莲
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GUANGYUAN RUIFENG NEW MATERIALS Co.,Ltd.
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谭建军
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Abstract

The invention belongs to the technical field of coatings, and particularly relates to an external wall heat-insulating coating. The coating comprises the following components in parts by weight: 20-25 parts of modified waterborne polyurethane emulsion, 40-50 parts of acrylic emulsion, 40-50 parts of filler, 10-18 parts of pigment, 1-3 parts of dispersant, 0.1-0.3 part of light stabilizer, 0.05-0.1 part of defoamer and 30-40 parts of deionized water; the modified waterborne polyurethane emulsion is comb-shaped organic silicon modified waterborne polyurethane, is prepared by taking isophorone diisocyanate, polytetrahydrofuran diol, double-tail dihydroxy silicone oil, dimethylolpropionic acid, 1, 4-butanediol, triethylamine and hydrazine hydrate as main raw materials and adopting a prepolymer dispersion method. The organic silicon modified polyurethane fully combines the heat resistance and the water resistance of organic silicon and the wear resistance of polyurethane, and can obviously improve the mechanical property and the waterproof effect of the heat-insulating coating after being used for preparing the coating, thereby greatly prolonging the service life of the heat-insulating coating.

Description

Polyurethane modified heat-insulating coating and preparation method thereof
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a polyurethane modified heat-insulating coating and a preparation method thereof.
Background
Along with the development of social economy and the continuous improvement of the material level of people, the building energy consumption is also increased day by day. In addition, the energy consumption of cooling equipment used in the world every year also reaches more than 20% of the total energy consumption. Therefore, "building an economical society" has become an important subject of great attention in the current society, building energy conservation becomes a hot point of the society, and heat preservation and insulation have become an important direction for building energy conservation.
The development targets at home and abroad in the field of building coatings are also towards the development of high efficiency, energy and resource saving, harmlessness and no pollution. The building heat reflection heat insulation coating developed in recent years has not only decorative property, but also heat reflection heat insulation effect, has good blocking and reflection effect on light and heat when being applied to building roofs and inner and outer walls, can resist the baking of sunlight and environmental heat to buildings in hot summer, obviously reduces the indoor temperature, reduces the heat through wall loss in winter, achieves the effect of warm in winter and cool in summer, and has certain contribution to building energy conservation.
The heat insulation coating can be divided into water-based and solvent-based, and can be divided into thin type and thick type according to the construction state. The existing American shield heat-reflecting coating on the market is prepared by adopting pure acrylic emulsion, ceramic microspheres, mica powder and the like as raw materials, and belongs to a water-based thin heat-reflecting heat-insulating coating; the national institute of building materials science and research has firstly released heat-insulating coatings, and then released heat-insulating coatings by units such as Jiangsu Chenguang coating, Shanghai Hao family coating, Beijing national Pont and the like. However, the existing coating system is still prepared from acrylic emulsion or modified resin, and has the problems of single function, poor heat insulation effect, short service life and the like. The research and development of new heat-insulating coating formula are urgently needed to improve the comprehensive performance of the heat-insulating coating.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a polyurethane modified waterborne acrylic acid heat-insulating coating; the coating comprises the following components in parts by weight: 20-25 parts of modified waterborne polyurethane emulsion, 40-50 parts of acrylic emulsion, 40-50 parts of filler, 10-18 parts of pigment, 1-3 parts of dispersant, 0.1-0.3 part of light stabilizer, 0.05-0.1 part of defoamer and 30-40 parts of deionized water;
the modified waterborne polyurethane emulsion is comb-shaped organic silicon modified waterborne polyurethane, is prepared by taking isophorone diisocyanate, polytetrahydrofuran diol, double-tail dihydroxy silicone oil, dimethylolpropionic acid, 1, 4-butanediol, triethylamine and hydrazine hydrate as main raw materials and adopting a prepolymer dispersion method; the organosilicon modified polyurethane fully combines the heat resistance and the water resistance of organosilicon and the wear resistance of polyurethane, and can obviously improve the mechanical property and the waterproof effect of the heat-insulating coating after being used for preparing the coating, thereby greatly prolonging the service life of the heat-insulating coating.
The acrylic emulsion is a microemulsion formed by mixing one or more of acrylic acid, methacrylic acid, methyl methacrylate and butyl methacrylate;
the filler is a mixture consisting of hollow polymer microspheres and hollow glass microspheres, the mass ratio of the hollow polymer microspheres to the hollow glass microspheres is 1-3: 1, and the average particle size of the microspheres is 15 mu m; the mechanical property of a coating system can be obviously improved by adding the hollow polymer microspheres, and the solid content of the coating is further improved by the grading of the hollow polymer microspheres and the hollow glass microspheres, so that the coating keeps a good heat insulation effect;
the pigment is rutile titanium dioxide, the content of titanium dioxide is more than 93%, and the average particle size is less than 15 mu m; the high content and small particle size distribution of titanium dioxide can improve the reflection effect of the coating on infrared light and ultra-short waves;
the dispersant is anionic dispersant homopolymerized ammonium acrylate ECODIS P90;
the light stabilizer is a hindered amine light stabilizer;
the defoaming agent is an organic silicon defoaming agent and comprises at least one of polydimethylsiloxane, fluorosilicone and ethylene glycol siloxane.
The invention also provides a preparation method of the polyurethane modified waterborne acrylic acid heat insulation coating, which specifically comprises the following steps:
(1) preparing the aqueous polyurethane emulsion: putting the dehydrated isophorone diisocyanate, polytetrahydrofuran diol and double-tail dihydroxy silicone oil into a reaction kettle according to a certain proportion, carrying out prepolymerization reaction for 1h at the temperature of 80-85 ℃, then adding dimethylolpropionic acid and 1, 4-butanediol to continue to react for 20-30min, cooling to room temperature, adding triethylamine to neutralize and react for 15min, and finally adding hydrazine hydrate to react for 30min to obtain modified polyurethane emulsion;
(2) preparing a base material: adding deionized water and a small amount of ammonium persulfate initiator into a reaction kettle, heating to 80-85 ℃, adding an acrylic monomer, carrying out polymerization reaction, adding the modified polyurethane emulsion and a certain amount of ammonium persulfate initiator after reacting for 1-2h, continuing to react for 20-30min, cooling to 40 ℃ after the reaction is finished, adding ammonia water to adjust the pH value to 7-8, and continuing to turn to room temperature to obtain a base material system;
(3) preparing a coating: mixing pigment, filler, dispersant, defoaming agent and deionized water according to a mass ratio, and dispersing by using a high-speed dispersion machine to prepare slurry; adding the base material system prepared in the step (2) into the slurry, raising the temperature to 40 ℃, reacting for 2-3h, adding ammonia water to adjust the pH value to 7-8, cooling and discharging to obtain the polyurethane modified heat insulation coating;
further, the mass ratio of the isophorone diisocyanate, the polytetrahydrofuran diol and the double-tail dihydroxy silicone oil in the step (1) is 5: 2: 1; the addition amount of the dimethylolpropionic acid is 10-15% of that of isophorone diisocyanate; the adding amount of the 1, 4-butanediol is 5-10% of isophorone diisocyanate;
the invention has the beneficial effects that: (1) the organosilicon modified polyurethane modified water-based heat insulation coating fully utilizes the heat resistance of organosilicon, and the wear resistance of polyurethane greatly improves the mechanical property of a prepared coating system; (2) the composite filler system consisting of the hollow polymer microspheres and the hollow glass microspheres is adopted to further improve the mechanical property and the heat insulation effect of the coating; (3) the paint with high silicon dioxide content has higher reflectivity to heat and light, further improves the stability to light and prolongs the service life.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention. The filler used in the embodiment of the invention is a mixture consisting of hollow polymer microspheres and hollow glass microspheres, the mass ratio of the hollow polymer microspheres to the hollow glass microspheres is 1-3: 1, and the average particle size of the microspheres is 15 mu m; the pigment is rutile type titanium dioxide, the content of titanium dioxide is more than 94%, and the average grain diameter is less than 13 μm. The following are specific examples:
example 1.
The embodiment provides a polyurethane modified water-based acrylic acid heat insulation coating, which comprises the following components in parts by weight: 23 parts of modified aqueous polyurethane emulsion, 45 parts of acrylic emulsion, 46 parts of mixed filler, 13 parts of rutile titanium dioxide, 1 part of polyacrylic acid ammonium salt (ECODIS P90), 0.1 part of light stabilizer, 0.05 part of polydimethylsiloxane and 38 parts of deionized water; the acrylic emulsion is prepared by mixing 24 parts of acrylic acid, 36 parts of methacrylic acid, 6 parts of methyl methacrylate and 3 parts of butyl methacrylate by weight;
the preparation method of the polyurethane modified waterborne acrylic acid heat insulation coating comprises the following steps:
(1) preparing the aqueous polyurethane emulsion: putting 500g of dehydrated isophorone diisocyanate, 200g of polytetrahydrofuran diol and 100g of double-tail type dihydroxy silicone oil into a reaction kettle, carrying out prepolymerization reaction for 1h at the temperature of 80-85 ℃, adding 60g of dimethylolpropionic acid and 30g of 1, 4-butanediol, continuing to react for 30min, and cooling to room temperature; adding triethylamine in batches for neutralization reaction until the pH value of the system is between 7 and 8; finally, adding 5g of 80% hydrazine hydrate, and reacting for 30min to obtain modified polyurethane emulsion;
(2) preparing a base material: adding 900g of deionized water and 1g of ammonium persulfate initiator into a reaction kettle, heating to 80-85 ℃, adding 900g of acrylic monomer mixture, carrying out polymerization reaction, adding 460g of modified polyurethane emulsion and 2g of ammonium persulfate initiator after reacting for 1h, continuing to react for 30min, adding ammonia water to adjust the pH value to 7-8 after the reaction is finished, and continuing to cool to room temperature to obtain a base material system;
(3) preparing a coating: mixing 260g of rutile type titanium dioxide, 920g of mixed filler, ECODIS P9020 g, 1g of polydimethylsiloxane and 760g of deionized water according to the mass ratio, and dispersing by using a high-speed dispersion machine to prepare slurry; and (3) adding the base material system prepared in the step (2) into the slurry, raising the temperature to 40 ℃, reacting for 2 hours, adding ammonia water to adjust the pH value to 7-8, cooling and discharging to obtain the polyurethane modified heat insulation coating.
Example 2.
The embodiment provides a polyurethane modified water-based acrylic acid heat insulation coating, which comprises the following components in parts by weight: 25 parts of modified waterborne polyurethane emulsion, 48 parts of acrylic emulsion, 46 parts of mixed filler, 18 parts of rutile titanium dioxide, 2 parts of polyacrylic acid ammonium salt (ECODIS P90), 0.2 part of light stabilizer, 0.08 part of fluorosilicone and 40 parts of deionized water; the acrylic emulsion is prepared by mixing 40 parts of acrylic acid, 50 parts of methacrylic acid and 8 parts of methyl methacrylate by weight;
the preparation method is the same as example 1.
Example 3.
The embodiment provides a polyurethane modified water-based acrylic acid heat insulation coating, which comprises the following components in parts by weight: 24 parts of modified waterborne polyurethane emulsion, 40 parts of acrylic emulsion, 42 parts of mixed filler, 12 parts of rutile titanium dioxide, 3 parts of polyacrylic acid ammonium salt (ECODIS P90), 0.3 part of light stabilizer, 0.08 part of fluorosilicone and 33 parts of deionized water; the acrylic emulsion is prepared by mixing the following monomers in parts by weight to obtain 52 parts of acrylic acid, 13 parts of methyl methacrylate and 12 parts of butyl methacrylate;
the preparation method is the same as example 1.
The following tests were performed on the samples prepared in the examples of the present invention, respectively, and the test results were compared with similar products on the market (table 1):
(1) testing the surface solar reflectance, and detecting according to JG/T235-2008 'architectural reflective insulation coating';
(2) testing the heat insulation temperature difference: coating the paint on an iron plate with the thickness of 10mm multiplied by 10mm to prepare a sample plate, and testing the heat insulation effect of the sample plate under the same condition;
(3) and (3) impact strength measurement: according to GB/T1732-1993 'paint film impact resistance determination method';
(4) and (3) flexibility measurement: measured using a paint film elasticity tester according to GB1731-1979 "paint film flexibility determination methods".
TABLE 1 polyurethane modified thermal insulation coating Performance parameters
Figure BDA0002371141560000071
As can be seen from the data in Table 1, the thermal insulation coating prepared by the invention has better thermal insulation effect and stronger mechanical property, and has competitiveness compared with commercial products.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A polyurethane modified waterborne acrylic acid heat insulation coating comprises the following components in parts by weight: 20-25 parts of modified waterborne polyurethane emulsion, 40-50 parts of acrylic emulsion, 40-50 parts of filler, 10-18 parts of pigment, 1-3 parts of dispersant, 0.1-0.3 part of light stabilizer, 0.05-0.1 part of defoamer and 30-40 parts of deionized water;
the modified waterborne polyurethane emulsion is comb-shaped organic silicon modified waterborne polyurethane, is prepared by taking isophorone diisocyanate, polytetrahydrofuran diol, double-tail dihydroxy silicone oil, dimethylolpropionic acid, 1, 4-butanediol, triethylamine and hydrazine hydrate as main raw materials and adopting a prepolymer dispersion method.
2. The polyurethane-modified water-based acrylic thermal insulation coating as claimed in claim 1, wherein the acrylic emulsion is a microemulsion formed by mixing one or more of acrylic acid, methacrylic acid, methyl methacrylate and butyl methacrylate;
the filler is a mixture consisting of hollow polymer microspheres and hollow glass microspheres, the mass ratio of the hollow polymer microspheres to the hollow glass microspheres is 1-3: 1, and the average particle size of the microspheres is 15 mu m;
the pigment is rutile titanium dioxide, the content of titanium dioxide is more than 93%, and the average particle size is less than 15 mu m;
the dispersant is anionic dispersant homopolymerized ammonium acrylate ECODIS P90;
the light stabilizer is a hindered amine light stabilizer;
the defoaming agent is an organic silicon defoaming agent and comprises at least one of polydimethylsiloxane, fluorosilicone and ethylene glycol siloxane.
3. A preparation method of a polyurethane modified water-based acrylic acid heat insulation coating specifically comprises the following steps:
(1) preparing the aqueous polyurethane emulsion: putting the dehydrated isophorone diisocyanate, polytetrahydrofuran diol and double-tail dihydroxy silicone oil into a reaction kettle according to a certain proportion, carrying out prepolymerization reaction for 1h at the temperature of 80-85 ℃, then adding dimethylolpropionic acid and 1, 4-butanediol to continue to react for 20-30min, cooling to room temperature, adding triethylamine to neutralize and react for 15min, and finally adding hydrazine hydrate to react for 30min to obtain modified polyurethane emulsion;
(2) preparing a base material: adding deionized water and a small amount of ammonium persulfate initiator into a reaction kettle, heating to 80-85 ℃, adding an acrylic monomer, carrying out polymerization reaction, adding the modified polyurethane emulsion and a certain amount of ammonium persulfate initiator after reacting for 1-2h, continuing to react for 20-30min, cooling to 40 ℃ after the reaction is finished, adding ammonia water to adjust the pH value to 7-8, and continuing to turn to room temperature to obtain a base material system;
(3) preparing a coating: mixing pigment, filler, dispersant, defoaming agent and deionized water according to a mass ratio, and dispersing by using a high-speed dispersion machine to prepare slurry; and (3) adding the base material system prepared in the step (2) into the slurry, raising the temperature to 40 ℃, reacting for 2-3h, adding ammonia water to adjust the pH value to 7-8, cooling and discharging to obtain the polyurethane modified heat insulation coating.
4. The preparation method of the polyurethane-modified water-based acrylic thermal insulation coating according to claim 3, wherein the mass ratio of the isophorone diisocyanate, the polytetrahydrofuran diol and the dicarbamic dihydroxy silicone oil in the step (1) is 5: 2: 1; the addition amount of the dimethylolpropionic acid is 10-15% of that of isophorone diisocyanate; the adding amount of the 1, 4-butanediol is 5-10% of isophorone diisocyanate.
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