A heat-insulating and antibacterial coating for aluminum profiles and preparation method thereof

Abstract

The present invention relates to the technical field of coatings, and discloses a heat-insulating antibacterial coating for aluminum profiles and a preparation method. The raw materials of the coating of the present invention include 100 parts by weight of vinyl silicone oil, 10-25 parts by weight of methylvinyl polysiloxane, 6-12 parts by weight of hydrogenated silicone oil, 2-6 parts by weight of acrylamide triazole quaternary ammonium salt, etc. The alkenyl group of the acrylamide triazole quaternary ammonium salt undergoes a hydrosilylation reaction with the hydrogenated silicone oil, and the triazole structure is introduced into the molecular chain of the vinyl silicone oil and the polysiloxane, thereby enhancing the interfacial interaction force between the polysiloxane polymer molecular chain and the aluminum alloy and improving the adhesion of the polysiloxane coating to the aluminum alloy. The acrylamide triazole quaternary ammonium salt contains a diquaternary ammonium salt group, forms an organosilicon quaternary ammonium salt antibacterial structure, and significantly improves the antibacterial properties of the coating and the aluminum alloy.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, in particular to a heat-insulating and antibacterial coating for aluminum profiles and a preparation method thereof. Background Art

[0002] Aluminum alloy profiles have the advantages of lightweight, high strength, electrical conductivity and thermal conductivity, and are widely used in construction engineering fields such as door and window frames, automotive industry fields such as brake discs, and biological tissue engineering fields such as orthotics.

[0003] In order to improve the corrosion resistance, mechanical strength, and aesthetics of aluminum alloy profiles, it is necessary to spray resin coatings on the surface of aluminum profiles. Common coatings for aluminum profiles include epoxy resins, polyurethanes, polysiloxanes, etc. Among them, polysiloxane coatings have good waterproof and anti-corrosion properties, strong high temperature resistance, and high wear resistance, and are widely used.

[0004] Patent announcement number CN115651530B discloses a method for preparing an aluminum alloy nano easy-to-clean film and an easy-to-clean aluminum alloy plate. The film uses fluorinated polyester polysiloxane, methyltriethoxysilane, octamethylcyclotetrasiloxane, toluene diisocyanate, etc. as raw materials. The prepared coating for aluminum alloy plates has good hydrophobicity, oleophobicity, weather resistance, and friction resistance. However, the polysiloxane coating has low adhesion to the aluminum alloy, resulting in easy peeling of the coating. In addition, the antibacterial performance of the polysiloxane coating is not high, which limits its practical application. Summary of the Invention

[0005] The present invention provides a heat-insulating and antibacterial coating for aluminum profiles and a preparation method thereof, which solves the problem of low adhesion between the organic silicon coating and the aluminum alloy surface, while reflecting the good antibacterial properties of the aluminum alloy.

[0006] Technical solution: A heat-insulating and antibacterial coating for aluminum profiles, the raw materials of which include 100 parts by weight of vinyl silicone oil, 10-25 parts by weight of methylvinyl polysiloxane, 6-12 parts by weight of hydrogen-containing silicone oil, 2-6 parts by weight of acrylamide triazole quaternary ammonium salt, and 0.008-0.013 parts by weight of platinum catalyst.

[0007] Preferably, the preparation method of the heat-insulating antibacterial coating for aluminum profiles is: vinyl silicone oil, methyl vinyl polysiloxane, hydrogen-containing silicone oil, and acrylamide triazole quaternary ammonium salt are stirred and mixed, and then a platinum catalyst is added, and the mixture is coated on the surface of the aluminum alloy profile after stirring, and thermally cured to obtain the heat-insulating antibacterial coating for the aluminum profile.

[0008] Preferably, the thermal curing temperature is 100-125° C. and the curing time is 15-60 min.

[0009] Preferably, the preparation method of acrylamide triazole quaternary ammonium salt comprises:

[0010] (1) In an ice bath, add 4-amino-1,2,4-triazole, acryloyl chloride, and triethylamine to the solvent, and then react at 15-25°C for 12-18 hours. After filtering, the filtrate is rotary evaporated, and the product is recrystallized and purified in ethanol to obtain 4-acrylamide-1,2,4-triazole. The reaction formula is as follows:

[0011] .

[0012] (2) Add 4-acrylamide-1,2,4-triazole and dibromo compound to the solvent, heat to 75-85°C, condense and reflux for 6-18 hours, rotary evaporate, wash with ethanol, and then recrystallize and purify the product in a mixed solution of ethanol and water to obtain acrylamide triazole quaternary ammonium salt. The reaction formula is:

[0013] .

[0014] Preferably, the solvent in (1) is dichloromethane or tetrahydrofuran.

[0015] Preferably, the ratio of 4-amino-1,2,4-triazole, acryloyl chloride and triethylamine in (1) is 1 mol: (0.8-1.4) mol: (1-1.4) mol.

[0016] Preferably, the solvent in (2) is isopropanol or acetonitrile.

[0017] Preferably, the ratio of 4-acrylamide-1,2,4-triazole to the dibromo compound in (2) is (2-2.2) mol:1 mol.

[0018] Preferably, the structural formula of the dibromo compound in (2) is Br-(CH2) n Br, n is 2-8.

[0019] Beneficial technical effects: The present invention uses vinyl silicone oil, methyl vinyl polysiloxane, and hydrogen-containing silicone oil as the main agents of the polysiloxane coating, and simultaneously adds acrylamide triazole quaternary ammonium salt. During the thermal curing process, the alkenyl group of the acrylamide triazole quaternary ammonium salt undergoes a hydrosilylation reaction with the hydrogen-containing silicone oil, thereby introducing a triazole structure into the molecular chains of the vinyl silicone oil and the polysiloxane. The triazole structure can form a strong coordination effect with the surface of the aluminum alloy, thereby enhancing the interfacial interaction force between the polysiloxane polymer molecular chain and the aluminum alloy, improving the adhesion of the polysiloxane coating to the aluminum alloy, and making the coating less likely to peel off.

[0020] The acrylamide triazole quaternary ammonium salt of the present invention contains a diquaternary ammonium salt group, which is grafted into the polysiloxane polymer molecular chain to form an organosilicon quaternary ammonium salt antibacterial structure. The structure is uniformly dispersed in the coating matrix through chemical bonding, has more sterilization sites, and significantly improves the antibacterial properties of the coating and the aluminum alloy.

[0021] Aluminum alloy itself has high thermal conductivity, while the thermal conductivity of polysiloxane coating is low. Coating it on the surface of aluminum alloy profiles is beneficial to reduce heat conduction and improve the thermal insulation performance of aluminum alloy profiles. DETAILED DESCRIPTION

[0022] The present invention is further described below with reference to specific examples. The raw materials and reagents used in the following examples and comparative examples are all commercially available products. Hydrogenated silicone oil, item number ZX-P05, vinyl silicone oil, model ZX-P04, and platinum catalyst, item number ZX-BJ01, were all purchased from Dongguan Zhongxin Organic Silicone Materials Co., Ltd. Methyl vinyl polysiloxane, containing 99% of the ingredient, was purchased from Hubei Zhonglong Kangsheng Fine Chemical Co., Ltd.

[0023] Example 1

[0024] (1) In an ice bath, add 30 mmol of 4-amino-1,2,4-triazole, 42 mmol of acryloyl chloride, and 42 mmol of triethylamine to 150 mL of dichloromethane, and then react at 15°C for 18 h. After filtering, the filtrate is rotary evaporated and the product is purified by recrystallization from ethanol to obtain 4-acrylamide-1,2,4-triazole.

[0025] (2) Add 40 mmol of 4-acrylamide-1,2,4-triazole and 20 mmol of 1,2-dibromoethane to 25 mL of acetonitrile, heat to 80°C, reflux under condensation for 8 h, rotary evaporate, wash with ethanol, and then recrystallize and purify the product in a mixed solution of ethanol and water in a volume ratio of 2:8 to obtain acrylamide triazole quaternary ammonium salt.

[0026] (3) 100 g of vinyl silicone oil, 21 g of methyl vinyl polysiloxane, 10.6 g of hydrogenated silicone oil, and 2 g of acrylamide triazole quaternary ammonium salt were stirred and mixed, and then 0.012 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 110 ° C for 40 min to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0027] Example 2

[0028] (1) In an ice bath, add 30 mmol of 4-amino-1,2,4-triazole, 24 mmol of acryloyl chloride, and 30 mmol of triethylamine to 200 mL of tetrahydrofuran, and then react at 25°C for 12 h. After filtering, the filtrate is rotary evaporated and the product is purified by recrystallization from ethanol to obtain 4-acrylamide-1,2,4-triazole.

[0029] (2) Add 40 mmol of 4-acrylamide-1,2,4-triazole and 20 mmol of 1,4-dibromobutane to 35 mL of isopropanol, heat to 85 °C, reflux under condensation for 6 h, rotary evaporate, wash with ethanol, and then recrystallize and purify the product in a mixed solution of ethanol and water in a volume ratio of 2:8 to obtain acrylamide triazole quaternary ammonium salt.

[0030] (3) 100 g of vinyl silicone oil, 25 g of methyl vinyl polysiloxane, 12 g of hydrogenated silicone oil, and 3 g of acrylamide triazole quaternary ammonium salt were stirred and mixed, and then 0.013 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 100 °C for 60 min to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0031] Example 3

[0032] (1) 44 mmol of 4-acrylamide-1,2,4-triazole (prepared in the same manner as in Example 1) and 20 mmol of 1,8-dibromooctane were added to 30 mL of acetonitrile, heated to 75°C, and refluxed under condensation for 18 h. The mixture was rotary evaporated and washed with ethanol. The product was then recrystallized and purified from a mixed solution of ethanol and water in a volume ratio of 3:7 to obtain acrylamide triazole quaternary ammonium salt.

[0033] (2) 100 g of vinyl silicone oil, 10 g of methyl vinyl polysiloxane, 6 g of hydrogenated silicone oil, and 4.5 g of acrylamide triazole quaternary ammonium salt were stirred and mixed, and then 0.008 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 125 ° C for 15 minutes to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0034] Example 4

[0035] (1) 42 mmol of 4-acrylamide-1,2,4-triazole (prepared in the same manner as in Example 1) and 20 mmol of 1,6-dibromohexane were added to 30 mL of acetonitrile, heated to 80°C, and refluxed under condensation for 8 h. The mixture was rotary evaporated and washed with ethanol. The product was then recrystallized and purified from a mixed solution of ethanol and water in a volume ratio of 3:7 to obtain acrylamide triazole quaternary ammonium salt.

[0036] (2) 100 g of vinyl silicone oil, 16 g of methyl vinyl polysiloxane, 8 g of hydrogenated silicone oil, and 6 g of acrylamide triazole quaternary ammonium salt were stirred and mixed, and then 0.01 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 120 ° C for 30 min to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0037] Comparative Example 1

[0038] (1) 100 g of vinyl silicone oil, 21 g of methyl vinyl polysiloxane, and 10.6 g of hydrogenated silicone oil were stirred and mixed, and then 0.012 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 110 ° C for 40 min to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0039] Comparative Example 2

[0040] (1) 100 g of vinyl silicone oil, 21 g of methyl vinyl polysiloxane, 10.6 g of hydrogenated silicone oil, and 2 g of 4-acrylamide-1,2,4-triazole (prepared in the same manner as in Example 1) were stirred and mixed, and then 0.012 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of an aluminum alloy profile and heat-cured at 110°C for 40 min to obtain a heat-insulating and antibacterial coating for an aluminum profile.

[0041] Comparative Example 3

[0042] (1) Add 20 mmol of 4-amino-1,2,4-triazole and 10 mmol of 1,2-dibromoethane to 10 mL of acetonitrile, heat to 80 ° C, condense and reflux for 4 hours, rotary evaporate, wash with acetonitrile, and dry to obtain triazole quaternary ammonium salt with the structural formula .

[0043] (2) 100 g of vinyl silicone oil, 21 g of methyl vinyl polysiloxane, 10.6 g of hydrogenated silicone oil, and 2 g of triazole quaternary ammonium salt were stirred and mixed, and then 0.012 g of platinum catalyst was added. After stirring, the mixture was coated on the surface of the aluminum alloy profile and heat-cured at 110 ° C for 40 minutes to obtain a heat-insulating and antibacterial coating for the aluminum profile.

[0044] The adhesion level of the coating to aluminum alloy is tested according to GB / T 9286-2021 standard.

[0045] The antibacterial properties of the coating were tested according to GB / T 21866-2008. Antibacterial rate = (BC) / B × 100%. B is the average number of recovered bacteria (cfu / tablet) after 24 hours in the antibacterial coating sample. C is the average number of recovered bacteria (cfu / tablet) after 24 hours in the blank control sample (the antibacterial coating of Comparative Example 1).

[0046] Table 1 Performance test of thermal insulation and antibacterial coating for aluminum profiles

[0047]

[0048] Compare with comparative example 1, the polysiloxane coating of embodiment 1-embodiment 4 reaches the 0-1 level with the sticking force on aluminium alloy surface, mainly because in polysiloxane coating, add acrylamide triazole quaternary ammonium salt, it contains alkenyl, can with hydrogenated silicone oil generation silylation reaction, thereby triazole structure is incorporated in the molecular chain of vinyl silicone oil, polysiloxane, and triazole structure and aluminium alloy surface can form strong coordination, thereby strengthened the interfacial interaction force between polysiloxane polymer molecular chain and the aluminium alloy, improved polysiloxane coating and the sticking force of aluminium alloy.And acrylamide triazole quaternary ammonium salt contains diquaternary ammonium salt group, is grafted in polysiloxane polymer molecular chain, forms organosilicon quaternary ammonium salt antimicrobial structure, and is evenly dispersed in coating matrix by chemical bonding, has more sterilization sites, significantly improved the antibacterial rate of coating to Escherichia coli and Staphylococcus aureus, has very strong antimicrobial property.

[0049] 4-acrylamide-1,2,4-triazole is added to the polysiloxane coating of comparative example 2, and it does not contain diquaternary ammonium salt group, and organosilicon quaternary ammonium salt antibacterial structure cannot be formed, and the antibacterial property of coating is poor. The triazole quaternary ammonium salt added in comparative example 3 does not contain alkenyl, and it is impossible to react with vinyl silicone oil, hydrogen silicone oil etc. to produce hydrosilylation, and triazole structure can not be introduced into the molecular chain of polysiloxane polymer, and it is difficult to effectively improve the interfacial force between polysiloxane polymer molecular chain and aluminum alloy, resulting in that the adhesion of polysiloxane coating to aluminum alloy is only grade 2, and triazole quaternary ammonium salt cannot act by chemical bonding, and is evenly dispersed in the coating matrix, resulting in that the sterilization site of coating is less, and antibacterial rate is lower than each embodiment.

[0050] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A heat-insulating and antibacterial coating for aluminum profiles, characterized in that: The raw materials of the coating include 100 parts by weight of vinyl silicone oil, 10-25 parts by weight of methylvinyl polysiloxane, 6-12 parts by weight of hydrogenated silicone oil, 2-6 parts by weight of acrylamide triazole quaternary ammonium salt, and 0.008-0.013 parts by weight of platinum catalyst; The general structural formula of the acrylamide triazole quaternary ammonium salt is as follows: , n is 2-8.

2. The heat-insulating and antibacterial coating for aluminum profiles according to claim 1, characterized in that: The preparation method of the acrylamide triazole quaternary ammonium salt comprises: (1) In an ice bath, add 4-amino-1,2,4-triazole, acryloyl chloride, and triethylamine to the solvent, and then react at 15-25°C for 12-18 hours. After filtering, the filtrate is rotary evaporated, and the product is purified by recrystallization to obtain 4-acrylamide-1,2,4-triazole; (2) Add 4-acrylamide-1,2,4-triazole and dibromo compound to the solvent, heat to 75-85°C, condense and reflux for 6-18 hours, rotary evaporate, wash, and purify the product by recrystallization to obtain acrylamide triazole quaternary ammonium salt.

3. The heat-insulating and antibacterial coating for aluminum profiles according to claim 2, characterized in that: The solvent in (1) is dichloromethane or tetrahydrofuran.

4. The heat-insulating and antibacterial coating for aluminum profiles according to claim 2, characterized in that: The ratio of 4-amino-1,2,4-triazole, acryloyl chloride and triethylamine in (1) is 1 mol: (0.8-1.4) mol: (1-1.4) mol.

5. The heat-insulating and antibacterial coating for aluminum profiles according to claim 2, characterized in that: The solvent in (2) is isopropanol or acetonitrile.

6. The heat-insulating and antibacterial coating for aluminum profiles according to claim 2, characterized in that: The ratio of 4-acrylamide-1,2,4-triazole to dibromo compound in (2) is (2-2.2) mol:1 mol.

7. The heat-insulating and antibacterial coating for aluminum profiles according to claim 6, characterized in that: The structural formula of the dibromo compound is Br-(CH2) n Br, n is 2-8.

8. A method for preparing a heat-insulating and antibacterial coating for aluminum profiles according to any one of claims 1 to 7, characterized in that: The preparation method comprises: stirring and mixing vinyl silicone oil, methylvinyl polysiloxane, hydrogenated silicone oil and acrylamide triazole quaternary ammonium salt, then adding a platinum catalyst, coating the mixture on the surface of an aluminum alloy profile after stirring, and thermally curing the mixture to obtain a heat-insulating and antibacterial coating for the aluminum profile.

9. The method for preparing the heat-insulating and antibacterial coating for aluminum profiles according to claim 8, characterized in that: The thermal curing temperature is 100-125° C. and the time is 15-60 minutes.

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