阅读说明：本技术 一种水性丙烯酸外墙隔热涂料及其制备方法 (Water-based acrylic acid exterior wall heat-insulating coating and preparation method thereof ) 是由 罗小进 于 2021-03-31 设计创作，主要内容包括：本发明属于建筑涂料技术领域,具体涉及一种外墙隔热涂料。所述涂料包括如下重量份数的组成：水性丙烯酸乳液40-60份,填料40-50份,颜料3-8份、消泡剂0.5-1份、增稠剂1-5份、PH调节剂0.5-1份、水20-43份；所述丙烯酸乳液为丙烯酸25-30份、甲基丙烯酸5-12份、丙烯酸丁酯15-30份、苯乙烯5-15份为原料制备的共聚物乳液；所述填料为改性空心玻璃微珠,为通过TiO-2和焦磷酸钠依次改性后的空心玻璃微珠；所述增稠剂为1-羟丙基-3-乙基咪唑磷酸二乙酯盐。本发明所制备的涂料反光和防沉降性能好,保温和节能效果更优。(The invention belongs to the technical field of building coatings, and particularly relates to an external wall heat-insulating coating. The coating comprises the following components in parts by weight: 40-60 parts of water-based acrylic emulsion, 40-50 parts of filler, 3-8 parts of pigment, 0.5-1 part of defoaming agent, 1-5 parts of thickening agent, 0.5-1 part of pH regulator and 20-43 parts of water; the acrylic emulsion is copolymer emulsion prepared by taking 25-30 parts of acrylic acid, 5-12 parts of methacrylic acid, 15-30 parts of butyl acrylate and 5-15 parts of styrene as raw materials; the filler is modified hollow glass micro-beads and is TiO 2 And sodium pyrophosphate are sequentially modified to form hollow glass microspheres; the thickening agent is 1-hydroxypropyl-3-ethylimidazole diethyl phosphate. Prepared by the inventionThe coating has good light reflection and anti-settling performance and better heat preservation and energy saving effects.)

1. A water-based acrylic acid exterior wall heat insulation coating comprises the following components in parts by weight: 40-60 parts of water-based acrylic emulsion, 40-50 parts of filler, 3-8 parts of pigment, 0.5-1 part of defoaming agent, 1-5 parts of thickening agent, 0.5-1 part of pH regulator and 20-43 parts of water;

the acrylic emulsion is copolymer emulsion prepared by taking 25-30 parts of acrylic acid, 5-12 parts of methacrylic acid, 15-30 parts of butyl acrylate and 5-15 parts of styrene as raw materials;

the filler is modified hollow glass micro-beads and is TiO₂And sodium pyrophosphate are sequentially modified to form the hollow glass microsphere.

2. The water-based acrylic acid exterior wall thermal insulation coating as claimed in claim 1, wherein the thickener is 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, and has the following structure:

3. the water-based acrylic exterior wall thermal insulation coating as claimed in claim 1, wherein the pigment is at least one of rutile type titanium dioxide, zinc oxide and ultrafine mica powder.

4. The water-based acrylic exterior wall thermal insulation coating as claimed in claim 1, wherein the defoaming agent is a silicone defoaming agent.

5. The water-based acrylic exterior wall thermal insulation coating as claimed in claim 1, wherein the pH regulator is dimethylamino ethanol.

6. A preparation method of the water-based acrylic acid exterior wall thermal insulation coating of any one of claims 1-5 comprises the following specific preparation steps:

(1) modification of hollow glass beads: soaking the hollow glass beads in a dilute hydrochloric acid solution for 1h, and then drying at the temperature of 130-; mixing the treated hollow glass beads with Ti (SO)₄)₂Mixing the components according to the mass ratio, adding the mixture into NaOH solution, continuously stirring and settling for 1-2h, filtering, drying and roasting to obtain TiO₂Coated hollow glass microspheres; adding TiO into the mixture₂Adding the modified hollow glass beads into a sodium pyrophosphate aqueous solution, continuously stirring for 20-30min to obtain flocculent precipitates, filtering, drying and roasting to obtain modified hollow glass beads;

(2) fully mixing acrylic acid, methacrylic acid, butyl acrylate and styrene according to a mass ratio, slowly dripping into deionized water containing 1% polyoxyethylene-4-phenol ether ammonium sulfate, and dispersing at a high speed to prepare a pre-emulsion;

(3) adding an ammonium persulfate initiator, a polyoxyethylene-4-phenol ether ammonium sulfate emulsifier and a pH buffer sodium bicarbonate into a reaction kettle, and heating to 80-85 ℃; dripping 10% of pre-emulsion to prepare seed emulsion;

(4) carrying out heat preservation reaction on the seed emulsion prepared in the step (3) for 10-30min, then dropwise adding the rest pre-emulsion and an initiator, heating to 90-95 ℃ after dropwise adding, carrying out heat preservation reaction for 1-2h, cooling to room temperature, adjusting the pH value to 7-8 by using ammonia water, and discharging to obtain an acrylic emulsion base material;

(5) adding the modified hollow glass beads, the pigment and the defoaming agent into deionized water, stirring at a high speed and mixing uniformly to prepare slurry; and (3) adding the acrylic emulsion base material prepared in the step (4) under the condition of high-speed stirring, finally adding a pH regulator to regulate the pH value to be 7-8, raising the temperature to 40-50 ℃, stirring and reacting for 30-50min, adding a thickening agent, and continuously stirring for 10-20min to obtain the exterior wall heat-insulating coating.

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a water-based acrylic acid exterior wall heat-insulating coating and a preparation method thereof.

Background

The building energy consumption accounts for more than 30 percent of the human energy consumption, and the improvement of the heat preservation and insulation performance, the use function, the energy conservation and the consumption reduction of the building are another important consideration factor of the current building material selection design. 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-insulating coating can be classified into a barrier type, a reflection type and a radiation type according to a heat-insulating mechanism and a heat-insulating mode of the heat-insulating coating. A coating with good thermal insulation and heat preservation effects is often the result of the synergistic effect of two or more thermal insulation mechanisms. At present, the silicate heat insulation coating in China is the most widely produced and used barrier type heat insulation coating, and the reflection type and radiation type heat insulation coating is not widely applied. However, for the thermal barrier coating of the barrier type, the thermal barrier coating is less used for exterior wall coating due to structural defects of the material itself.

The water-based acrylic coating is low in price, has the characteristics of safety, environmental protection, excellent aging resistance, good alkali resistance, simple synthesis and processing and the like, and has important application in the functions of water resistance, fire prevention, corrosion prevention, pollution prevention, heat insulation and the like. The water-based acrylic coating also has some defects, such as further improvement of heat insulation effect, further improvement of coating effect and mechanical property.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a water-based acrylic acid exterior wall heat-insulating coating which comprises the following components in parts by weight: 40-60 parts of water-based acrylic emulsion, 40-50 parts of filler, 3-8 parts of pigment, 0.5-1 part of defoaming agent, 1-5 parts of thickening agent, 0.5-1 part of pH regulator and 20-43 parts of water;

the acrylic emulsion is copolymer emulsion prepared by taking 25-30 parts of acrylic acid, 5-12 parts of methacrylic acid, 15-30 parts of butyl acrylate and 5-15 parts of styrene as raw materials;

the filler is modified hollow glass micro-beads and is TiO₂And sodium pyrophosphate are sequentially modified to form the hollow glass microsphere. On the one hand, TiO₂The coating has excellent light reflection performance, the light reflection capability of the microspheres can be greatly improved by coating the coating on the surfaces of the hollow microspheres, and the heat insulation effect is further improved. On the other hand, sodium pyrophosphate is chelated on the surfaces of the microspheres by utilizing the chelating property of the sodium pyrophosphate, so that the dispersion of the modified microspheres in acrylic emulsion can be effectively improvedThe performance and the emulsification effect effectively solve the problem of the sedimentation of the glass beads in the acrylic emulsion.

The thickening agent is 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, and the structure is as follows:

the thickener belongs to a multifunctional ionic liquid structure, wherein anions have phosphate groups with strong complexing performance and can form a complexing effect with surface metal ions of pigments and fillers; hydroxyl in the cation can generate hydrogen bond association with acrylic prepolymer monomers; the result of this dual action is an increase in the viscosity of the coating, a reduction in the sedimentation of the pigments and fillers, and an increase in the shelf life.

The pigment is at least one of rutile titanium dioxide, zinc oxide and superfine mica powder;

the defoaming agent is an organic silicon defoaming agent;

the pH regulator is dimethylamino ethanol;

the invention also provides a preparation method of the water-based acrylic acid heat-insulating coating, which comprises the following specific preparation steps:

(1) modification of hollow glass beads: soaking the hollow glass beads in a dilute hydrochloric acid solution for 1h, and then drying at the temperature of 130-; mixing the treated hollow glass beads with Ti (SO)₄)₂Mixing the components according to the mass ratio, adding the mixture into NaOH solution, continuously stirring and settling for 1-2h, filtering, drying and roasting to obtain TiO₂Coated hollow glass microspheres; adding TiO into the mixture₂Adding the modified hollow glass beads into a sodium pyrophosphate aqueous solution, continuously stirring for 20-30min to obtain flocculent precipitates, filtering, drying and roasting to obtain modified hollow glass beads;

(2) fully mixing acrylic acid, methacrylic acid, butyl acrylate and styrene according to a mass ratio, slowly dripping into deionized water containing 1% polyoxyethylene-4-phenol ether ammonium sulfate, and dispersing at a high speed to prepare a pre-emulsion;

(3) adding an ammonium persulfate initiator, a polyoxyethylene-4-phenol ether ammonium sulfate emulsifier and a pH buffer sodium bicarbonate into a reaction kettle, and heating to 80-85 ℃; dripping 10% of pre-emulsion to prepare seed emulsion;

(4) carrying out heat preservation reaction on the seed emulsion prepared in the step (3) for 10-30min, then dropwise adding the rest pre-emulsion and an initiator, heating to 90-95 ℃ after dropwise adding, carrying out heat preservation reaction for 1-2h, cooling to room temperature, adjusting the pH value to 7-8 by using ammonia water, and discharging to obtain an acrylic emulsion base material;

(5) adding the modified hollow glass beads, the pigment and the defoaming agent into deionized water, stirring at a high speed and mixing uniformly to prepare slurry; and (3) adding the acrylic emulsion base material prepared in the step (4) under the condition of high-speed stirring, finally adding a pH regulator to regulate the pH value to be 7-8, raising the temperature to 40-50 ℃, stirring and reacting for 30-50min, adding a thickening agent, and continuously stirring for 10-20min to obtain the exterior wall heat-insulating coating.

The invention has the beneficial effects that: by using TiO₂The sodium pyrophosphate modified hollow glass microspheres improve the dispersion effect of the filler in a coating system; due to TiO₂The heat insulation effect is further improved due to the strong light reflection performance; the added difunctional thickener effectively improves the synergistic effect between the pigment and filler system and the acrylic emulsion, reduces the sedimentation and has longer retention period.

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 thickening agent 1-hydroxypropyl-3-ethylimidazole diethyl phosphate used in the embodiment of the invention is prepared by laboratories, and the specific reaction route is as follows:

the synthesis process of the thickener comprises the following steps: adding 1-hydroxypropyl imidazole (1260g) into a reaction kettle under the protection of nitrogen, starting stirring, dropwise adding triethyl phosphate (1820g), keeping the temperature below 40 ℃ in the dropwise adding process, raising the temperature to 80 ℃ after the dropwise adding is finished, and carrying out heat preservation reaction for 24 hours to obtain a viscous liquid, namely 1-hydroxypropyl-3-ethylimidazole diethyl phosphate.

Example 1.

The embodiment provides a water-based acrylic acid exterior wall heat-insulating coating, which comprises 43 parts by weight of water-based acrylic acid emulsion, 45 parts by weight of modified hollow glass microspheres, 4 parts by weight of rutile titanium dioxide, 0.8 part by weight of an organic silicon defoamer, 1 part by weight of 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, 0.6 part by weight of a pH regulator dimethylamino ethanol and 30 parts by weight of water;

the acrylic emulsion is copolymer emulsion prepared by taking 25 parts of acrylic acid, 6 parts of methacrylic acid, 20 parts of butyl acrylate and 8 parts of styrene as raw materials;

the preparation method of the water-based acrylic acid exterior wall heat-insulating coating comprises the following specific steps:

(1) modification of hollow glass beads: 1kg of hollow glass microspheres are soaked in 3 percent dilute hydrochloric acid solution (3L) for 1 hour and then dried at 140 ℃ for later use; mixing the treated hollow glass beads with 100g of Ti (SO)₄)₂Mixing, adding into 3L 5% NaOH solution, stirring and settling for 1 hr, filtering, drying, and roasting at 560 deg.C to obtain TiO₂Coated hollow glass microspheres; adding TiO into the mixture₂Adding the modified hollow glass microspheres into 3L of sodium pyrophosphate aqueous solution (containing 260g of sodium pyrophosphate), continuously stirring for 20-30min to obtain flocculent precipitates, filtering, drying, and roasting at 750 ℃ of 600-;

(2) sufficiently mixing 250g of acrylic acid, 60g of methacrylic acid, 200g of butyl acrylate and 80g of styrene according to a mass ratio, slowly dripping into 4.5L of deionized water containing 1% of polyoxyethylene-4-phenol ether ammonium sulfate, and dispersing at a high speed to prepare a pre-emulsion;

(3) adding 1.2g of ammonium persulfate initiator, 4g of polyoxyethylene-4-phenol ether ammonium sulfate emulsifier and 12g of PH buffering agent sodium bicarbonate into a reaction kettle, and heating to 80-85 ℃; dripping 10% of pre-emulsion to prepare seed emulsion;

(4) carrying out heat preservation reaction on the seed emulsion prepared in the step (3) for 10-30min, then dropwise adding the rest pre-emulsion and 3.6g of ammonium persulfate initiator, heating to 90 ℃ after dropwise adding, carrying out heat preservation reaction for 1h, cooling to room temperature, adjusting the pH value to 7-8 by using ammonia water, and discharging to obtain an acrylic emulsion base material;

(5) adding 450g of modified hollow glass microspheres, 40g of rutile titanium dioxide and an organic silicon defoaming agent into 300g of deionized water, stirring at a high speed and mixing uniformly to prepare slurry; and (3) adding 430g of the acrylic emulsion base material prepared in the step (4) under the condition of high-speed stirring, finally adding dimethylamino ethanol to adjust the pH value to be 7-8, raising the temperature to 40-50 ℃, stirring for reaction for 30-50min, adding 10g of 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, and continuing stirring for 10-20min to obtain the external wall heat-insulating coating.

Example 2.

The embodiment provides a water-based acrylic acid exterior wall heat-insulating coating, which comprises the following components in parts by weight, 50 parts of a water-based acrylic acid emulsion, 50 parts of modified hollow glass beads, 4 parts of zinc oxide, 0.8 part of an organic silicon defoamer, 1 part of 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, 0.6 part of a pH regulator dimethylamino ethanol and 40 parts of water;

the acrylic emulsion is copolymer emulsion prepared by taking 27 parts of acrylic acid, 8 parts of methacrylic acid, 20 parts of butyl acrylate and 10 parts of styrene as raw materials;

the preparation method of the water-based acrylic exterior wall heat insulation coating is the same as that of the example 1.

Example 3.

The embodiment provides a water-based acrylic acid exterior wall heat-insulating coating, which comprises, by weight, 60 parts of a water-based acrylic acid emulsion, 50 parts of modified hollow glass microspheres, 7 parts of rutile titanium dioxide, 1 part of an organic silicon defoamer, 4 parts of 1-hydroxypropyl-3-ethylimidazole diethyl phosphate, 0.4 part of a pH regulator dimethylamino ethanol and 43 parts of water;

the acrylic emulsion is copolymer emulsion prepared by taking 27 parts of acrylic acid, 8 parts of methacrylic acid, 20 parts of butyl acrylate and 10 parts of styrene as raw materials;

the preparation method of the water-based acrylic exterior wall heat insulation coating is the same as that of the example 1.

Comparative example:

the comparative example provides a heat-insulating coating in the prior art, which comprises, by weight, 46 parts of a water-based acrylic emulsion, 40 parts of hollow glass beads, 3 parts of rutile titanium dioxide, 1 part of an organic silicon defoaming agent, 2 parts of a hydroxyethyl cellulose thickener, 0.6 part of a pH regulator dimethylamino ethanol and 30 parts of water;

the acrylic emulsion is copolymer emulsion prepared by taking 25 parts of acrylic acid, 20 parts of butyl acrylate and 8 parts of styrene as raw materials;

the preparation method of the prior art comprises the following steps:

(1) sufficiently mixing 250g of acrylic acid, 200g of butyl acrylate and 80g of styrene according to a mass ratio, slowly dropping the mixture into deionized water containing 1% of polyoxyethylene-4-phenol ether ammonium sulfate for 3.5L, and dispersing at a high speed to prepare a pre-emulsion;

(2) adding 1.0g of ammonium persulfate initiator, 3g of polyoxyethylene-4-phenol ether ammonium sulfate emulsifier and 10g of PH buffering agent sodium bicarbonate into a reaction kettle, and heating to 80-85 ℃; dripping 10% of pre-emulsion to prepare seed emulsion;

(3) carrying out heat preservation reaction on the seed emulsion prepared in the step (3) for 10-30min, then dropwise adding the rest pre-emulsion and 3g of ammonium persulfate initiator, heating to 90 ℃ after dropwise adding, carrying out heat preservation reaction for 1h, cooling to room temperature, adjusting the pH value to 7-8 by using ammonia water, and discharging to obtain an acrylic emulsion base material;

(4) adding 400g of hollow glass microspheres, 30g of rutile titanium dioxide and 10g of organic silicon defoamer into 300g of deionized water, stirring at a high speed and mixing uniformly to prepare slurry; then adding 460g of the acrylic emulsion base material prepared in the step (3) under the condition of high-speed stirring, finally adding dimethylamino ethanol to adjust the pH value to be 7-8, raising the temperature to 40-50 ℃, stirring for reaction for 30-50min, adding hydroxyethyl cellulose, and continuing stirring for 10-20min to obtain the external wall heat-insulating coating.

The following tests were performed on the samples prepared in the inventive example and the comparative example, respectively, and the test results are shown in 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) viscosity test, which is carried out by adopting a common viscometer;

(4) and (4) settling test, namely placing the prepared coating in a closed test tube, standing for 60 days, and observing the ratio of the height L of the upper clear solution to the total height L to calculate the settling rate.

TABLE 1 analysis of the properties of the exterior wall insulating coating

Sample (I)	Reflectance (%)	Thermal insulation temperature difference (. degree. C.)	Viscosity (cp)	Sedimentation Rate (%)
					Example 1	91	20	4778	1.20
Example 2	87	18	4432	1.08
					Example 3	92	20	5016	1.02
Comparative example	74	11	3246	16.2

The data in Table 1 show that the thermal insulation coating prepared by the invention has good thermal insulation effect, high viscosity and good anti-settling property.

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.