Environment-friendly thermal insulation coating for building outer wall and preparation method thereof

Abstract

The application discloses a preparation method of an environment-friendly heat insulation coating for building outer walls, which is prepared from polyethylene glycol (2000) diacrylate, polyethylene glycol (1000) diacrylate, polyethylene glycol (400 diacrylate), ethoxylated trimethylolpropane triacrylate (EO 15 (TMPTA), acryloyl morpholine (ACMO), tetrahydrofurfuryl alcohol methacrylate (THFMA), butyl methacrylate, t-butyl acrylate and other raw materials. The application is adjusted to the optimal acrylic resin and initiator system through a large number of experiments, and the conversion rate of the application is as high as 99.5%. The application obtains the optimal raw material composition and ratio through a large number of experiments, and preferably obtains an environment-friendly heat insulation building coating with a scientific and reasonable component ratio, high adhesion, good water solubility, good impact resistance, moderate viscosity and high solid content.

Description

Technical Field

[0001] This invention relates to an environmentally friendly heat-insulating coating for building exterior walls, belonging to the field of polymer coating technology. Background Technology

[0002] With the vigorous development of the construction industry, building energy consumption and carbon emissions account for a high proportion of total energy consumption and carbon emissions, respectively. Therefore, energy conservation and emission reduction are long-term strategies for sustainable development, making the development of a thermal insulation material imperative. This invention differs from traditional solvent-based coatings by adopting a water-based environmentally friendly system. It introduces acrylamide morpholine to reduce respiratory irritation during construction and uses monomers such as PEG(400)DA, which features fast curing speed and low skin irritation, effectively reducing skin irritation for construction workers.

[0003] Through extensive experimental screening, this invention has developed a heat-insulating coating with good adhesion, low irritation, low volatility, environmental friendliness, good thermal insulation performance, and moderate viscosity, with a solid content of over 70%, by selecting photocurable monomers, acrylic monomers, initiators, chain transfer agents, and synthesis conditions. Summary of the Invention

[0004] Purpose of the Invention: The purpose of this invention is to address the issue that existing exterior wall coatings are primarily solvent-based, and to replace them with water-soluble, environmentally friendly coatings. This reduces the use of irritating acrylic monomers such as methacrylic acid and hydroxyethyl acrylate, resulting in coatings with advantages such as low skin irritation, low solvent volatility, low small molecule migration, and low VOC emissions. The addition of ATO (nano-antimony-doped tin dioxide) insulating powder further enhances the environmentally friendly insulating effect of this coating.

[0005] Technical solution: To achieve the above objectives, the technical solution adopted by this invention is as follows:

[0006] An environmentally friendly thermal insulation coating for building exterior walls, characterized in that it is made from the following raw materials:

[0007] Polyethylene glycol (2000) diacrylate, polyethylene glycol (1000) diacrylate, polyethylene glycol (400) diacrylate, ethoxylated trimethylolpropane triacrylate, acryloylmorpholine, tetrahydrofurfuryl methacrylate, butyl methacrylate, tert-butyl acrylate, initiator, water.

[0008] As a preferred embodiment, the environmentally friendly thermal insulation coating for building exterior walls described above is made from the following raw materials by weight percentage:

[0009] Polyethylene glycol (2000) diacrylate 8-15%, polyethylene glycol (1000) diacrylate 7-16%, polyethylene glycol (400) diacrylate 5-15%, ethoxylated trimethylolpropane triacrylate 5-10%, acryloylmorpholine 10-20%, tetrahydrofurfuryl methacrylate 7-15%, butyl methacrylate 5-12%, tert-butyl acrylate 6-18%, initiator 0.5-1%, water 30-50%.

[0010] As a preferred embodiment, the environmentally friendly thermal insulation coating for building exterior walls described above is made from the following raw materials by weight percentage:

[0011] The composition includes 15% polyethylene glycol (2000) diacrylate, 10% polyethylene glycol (1000) diacrylate, 10% polyethylene glycol (400) diacrylate, 8% ethoxylated trimethylolpropane triacrylate, 20% acryloylmorpholine, 10% tetrahydrofurfuryl methacrylate, 8-12% butyl methacrylate, 10-15% tert-butyl acrylate, 0.5% initiator, and 30-50% water.

[0012] As a preferred option, the environmentally friendly heat-insulating coating for building exterior walls described above uses an initiator that is one or a mixture of several of the following: di-tert-butyl peroxide, potassium persulfate, and ammonium persulfate.

[0013] This invention screens the composition of various raw materials through extensive experiments. The addition of PEG(2000)DA, PEG(1000)DA, and PEG(400)DA provides flexibility. The addition of ethoxylated trimethylolpropane triacrylate (EO) further enhances the invention's flexibility. 15 -TMPTA can significantly reduce skin irritation. The addition of tetrahydrofurfuryl methacrylate (THFMA) in this invention can achieve excellent hardness and adhesion. The addition of acrylamide (ACMO) in this invention can improve the hydrophilicity of the resin. In particular, the addition of butyl methacrylate can greatly improve the flexibility, fullness and impact resistance. The addition of tert-butyl acrylate can improve the scratch resistance and impact resistance of the resin. The monomer ratios of this invention are appropriate, the conversion rate is high, and excellent technical effects have been achieved.

[0014] The preparation method of the environmentally friendly heat-insulating coating for building exterior walls according to the present invention includes the following steps:

[0015] (1) Add water to the reaction apparatus, purge with a certain amount of nitrogen gas and heat to 90-92℃;

[0016] (2) By weight percentage, polyethylene glycol (2000) diacrylate, polyethylene glycol (1000) diacrylate, polyethylene glycol (400) diacrylate, ethoxylated trimethylolpropane triacrylate, acrylamide, tetrahydrofurfuryl methacrylate, butyl methacrylate, tert-butyl acrylate and part of the initiator are mixed and added to the dropping tank.

[0017] (3) When the temperature of the reaction apparatus in step (1) reaches 90-92℃, the mixture in step (2) is added dropwise over 2-4 hours. After the addition is complete, the mixture is kept warm for 0.5-1 hour. Then the remaining initiator is added and the mixture is kept warm for another 0.5-1 hour.

[0018] As a preferred embodiment, in the preparation method of the above-described environmentally friendly heat-insulating coating for building exterior walls, the initiator is one or a mixture of several of di-tert-butyl peroxide, potassium persulfate, and ammonium persulfate.

[0019] As a preferred option, in the preparation method of the above-mentioned environmentally friendly heat-insulating coating for building exterior walls, in step (3), when the temperature of the reaction device in step (1) reaches 90-92℃, the mixture in step (2) is added dropwise, and the addition is completed in 4 hours. After the addition is completed, the mixture is kept warm for 0.5 hours, and then an initiator is added, and the mixture is kept warm for another 1 hour to obtain the final product.

[0020] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0021] This invention, developed through extensive experimental screening, utilizes water as a solvent, reducing harm to construction workers. It is also easy to apply, exhibits good curing performance, low skin irritation, high adhesion, high hardness, and good impact resistance. The conversion rate of this invention reaches up to 99%, and the resin solid content can reach over 70%. Detailed Implementation

[0022] Example 1

[0023] 1. A method for preparing an environmentally friendly heat-insulating coating for building exterior walls, comprising the following steps:

[0024] (1) Add 400 grams of water to the reaction apparatus, fill it with a certain amount of nitrogen gas, and heat it to 90-92°C;

[0025] (2) Mix 90g of quantitative PEG(2000)DA, 60g of PEG(1000)DA, 60g of PEG(400)DA, 48g of EO15-TMPTA, 60g of THFMA, 120g of ACMO, 90g of tert-butyl acrylate, 72g of butyl methacrylate, 10g of initiator potassium persulfate and 8g of ammonium persulfate evenly, and add to the dropping tank;

[0026] (3) When the temperature of the reaction apparatus in step (1) reaches 90-92℃, the mixed monomer and initiator from step (2) are added dropwise over 4 hours. After the addition is complete, the mixture is kept at this temperature for 0.5 hours. Then, a mixture of 3 g of potassium persulfate and 2 g of ammonium persulfate is added, and the mixture is kept at this temperature for another 1 hour. The final conversion rate is 99.5%, the resin solid content is 70%, and the emulsion particle size is measured using a zeta potential meter.

[0027] Example 2

[0028] 1. A method for preparing an environmentally friendly heat-insulating coating for building exterior walls, comprising the following steps:

[0029] (1) Add 400 grams of water to the reaction apparatus, fill it with a certain amount of nitrogen gas, and heat it to 90-92°C;

[0030] (2) Mix 90g of quantitative PEG(2000)DA, 60g of PEG(1000)DA, 60g of PEG(400)DA, 48g of EO15-TMPTA, 90g of tert-butyl acrylate, 72g of butyl methacrylate, and 9g of potassium persulfate and 7g of ammonium persulfate as initiators evenly, and add them to the dropping container;

[0031] (3) When the temperature of the reaction apparatus in step (1) reaches 90-92℃, the mixed monomer and initiator from step (2) are added dropwise over 4 hours. After the addition is complete, the mixture is kept at this temperature for 0.5 hours. Then, a mixture of 2 g of potassium persulfate and 1 g of ammonium persulfate is added, and the mixture is kept at this temperature for another 1 hour. The final conversion rate is 99.5%, the resin solid content is 70%, and the emulsion particle size is measured using a zeta potential meter.

[0032] Example 3 Results and Tests

[0033] 1. Examples 1 and 2, commercially available Keding UV water-based acrylic resin (model: KDD704) for building exterior walls, and various fillers from Table 1 below were added to a mixing tank in proportion. The mixture was stirred in a sand mill until a fineness of 40 μm was achieved, then filtered to obtain a resin slurry, which was then used to prepare an acrylic resin heat-insulating coating. The resin was coated onto tinplate and cured for 30 seconds on a 2 kW UV conveyor belt machine to obtain an acrylic ester coating. Its properties were tested and are shown in Table 2.

[0034] Table 1. Composition of Acrylic Resin Thermal Insulation Coating Formulation

[0035] Examples 1, 2 and commercially available KDD704 125 Dispersant BYK-156 0.5 Defoamer BYK-011 0.2 R706 titanium dioxide 20 natural barium sulfate 4 talcum powder 10 Antimony-doped tin dioxide (ATO) nano-insulating powder 20 Leveling agent BYK-306 0.2 Initiator 1173 5

[0036] Table 2 Performance test results:

[0037]

[0038] The above experimental results show that, in particular, the acrylic resin heat insulation coating prepared in Example 1 of the present invention has excellent hardness, adhesion, fine particle size and excellent gloss, and has a better infrared blocking rate.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an environmentally friendly heat-insulating coating for building exterior walls, characterized in that, It includes the following steps: (1) Add 400 grams of water to the reaction apparatus, fill it with a certain amount of nitrogen gas, and heat it to 90~92℃; (2) Mix 90g of polyethylene glycol 2000 diacrylate, 60g of polyethylene glycol 1000 diacrylate, 60g of polyethylene glycol 400 diacrylate, 48g of ethoxylated trimethylolpropane triacrylate EO15-TMPTA, 60g of tetrahydrofurfuryl methacrylate THFMA, 120g of acrylamide ACMO, 90g of tert-butyl acrylate, 72g of butyl methacrylate, and 10g of potassium persulfate and 8g of ammonium persulfate as initiators evenly, and add the mixture to the dropping container; (3) When the temperature of the reaction apparatus in step (1) reaches 90~92℃, the mixed monomer and initiator in step (2) are added dropwise. The addition is completed in 4 hours. After the addition is completed, the mixture is kept warm for 0.5 hours. Then, a mixture of 3 grams of potassium persulfate and 2 grams of ammonium persulfate is added and kept warm for another 1 hour.

2. An environmentally friendly thermal insulation coating for building exterior walls, characterized in that, It is made from the following components: 125g of the environmentally friendly heat-insulating coating for building exterior walls as described in claim 1, 0.5g of dispersant, 0.2g of defoamer, 20g of R706 titanium dioxide, 4g of natural barium sulfate, 10g of talc, 20g of nano-antimony-doped tin dioxide heat-insulating powder, and 0.2g of leveling agent.

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