A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls

Abstract

The invention discloses a highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, and relates to the technical field of building materials. The invention discloses a highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, comprising a tape backing and an adhesive layer covering one side of the tape backing; the adhesive layer is prepared from an acrylic adhesive composition; the preparation method of the acrylic adhesive composition comprises the following steps: using phosphorus oxychloride to organically treat nanoparticles to obtain organic nanoparticles; grafting the organic nanoparticles with 4-maleimidophenol to obtain component one; adding component one during the preparation of acrylic emulsion to obtain an acrylic adhesive composition. The acrylic adhesive composition prepared in the present application is used as the adhesive layer of the tape, giving the tape the characteristics of flame retardancy, UV aging resistance and good air tightness.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls. Background Art

[0002] Due to the growing trend of using free-form facades in high-rise buildings and the need to obtain sunlight, the use of curtain walls in building envelopes has increased due to their light weight, flexible design and strong earthquake resistance. The types of curtain walls are divided into architectural curtain walls, unitized curtain walls, component curtain walls, glass curtain walls, stone curtain walls and point-supported glass curtain walls, etc. Among the many types of curtain wall systems, laminated glass panels and aluminum frame curtain wall systems are used in high-rise buildings because their glass panels ensure sunlight exposure and their structural components are light in weight. Airtight tape is widely used in the bonding of frames and reinforcements of indoor and outdoor curtain wall panels. It is a pressure-sensitive tape of acrylic foam specially designed for bonding glass and metal frames in glass curtain walls. It is used to replace commonly used mechanical fasteners, gaskets or silicone structural adhesives, with faster process and longer service life. The adhesive layer composited on one or both sides of the airtight tape is generally made of acrylic emulsion adhesive.

[0003] Acrylic emulsion adhesives are one of the most widely used types of water-based adhesives, with advantages such as simple preparation, excellent bonding performance and wide bonding surface. However, acrylic emulsion adhesives also have certain defects, such as stickiness at high temperatures and hardening at low temperatures, which greatly affects the use of the material. With the advent of nanoscience and the continuous development of nanotechnology, the introduction of inorganic nanoparticles into acrylic polymers is a technology developed in recent years. The introduction of nanoparticles into acrylic polymers can toughen and strengthen the film itself, improve cohesion, improve the rheology of the adhesive layer, and reduce capillary action; nano calcium carbonate powder, as a new type of inorganic functional filler, has a steric hindrance effect and can significantly improve the adhesion of the material. However, as an inorganic nanoparticle, nano calcium carbonate powder has weak interface bonding ability and is easy to agglomerate when directly added to acrylic emulsion adhesives, which seriously affects the performance stability of the material. Summary of the invention

[0004] The purpose of the present invention is to provide a highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls to solve the following technical problems:

[0005] The existing nanoparticles directly added into acrylic emulsion adhesives have weak interface bonding ability and are easy to agglomerate, which seriously affects the performance stability of the material.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls, the adhesive tape comprising an adhesive tape backing and an adhesive layer covering one side of the adhesive tape backing; the adhesive layer is made of an acrylic adhesive composition;

[0008] The preparation method of the acrylic adhesive composition comprises the following steps:

[0009] S1: Add nanoparticles and toluene into a reaction kettle, control the temperature at 70-90°C, add phosphorus oxychloride, keep the temperature for 2-4 hours, adjust the pH to 7-7.5, wash and dry to obtain organic nanoparticles;

[0010] S2: adding the organic nanoparticles, 4-maleimidophenol and toluene into a reaction bottle, controlling the temperature at 60-80°C, keeping the temperature for reaction for 3-6 hours, washing with water and drying to obtain component 1;

[0011] S3: Add distilled water, sodium bicarbonate, and acrylate pre-emulsion component 1 into the reaction kettle and disperse them evenly, control the temperature at 75-85°C, add initiator component 1, continue to heat until the emulsion emits blue light, keep warm for 0.5-1h, add acrylate pre-emulsion component 2, keep warm for 1-2h, add component 1 and initiator component 2, keep warm for 1-2h, control the temperature at 80-90°C, keep warm for 1-2h, adjust the pH to neutral, filter, and obtain an acrylic adhesive composition.

[0012] As a further solution of the present invention: the addition ratio of the nanoparticles, toluene and phosphorus oxychloride in S1 is 10 g: 100-200 mL: 5-10 g.

[0013] As a further solution of the present invention: the addition ratio of the organized nanoparticles, 4-maleimidophenol and toluene in S2 is 10 g: 15-25 g: 100-200 mL.

[0014] As a further solution of the present invention: in S3, both the acrylate pre-emulsion component 1 and the acrylate pre-emulsion component 2 are acrylate pre-emulsions; the mass ratio of the acrylate pre-emulsion component 1 to the acrylate pre-emulsion component 2 is 5:25-26.5; the acrylate pre-emulsion accounts for 70-82% of the total mass of the acrylic adhesive composition.

[0015] As a further solution of the present invention: initiator component one and initiator component two are both ammonium persulfate; the mass ratio of initiator component one to initiator component two is 1:2-3; ammonium persulfate accounts for 0.3-0.4% of the total mass of the acrylic adhesive composition; sodium bicarbonate accounts for 0.2-0.5% of the total mass of the acrylic adhesive composition; component one accounts for 4-8% of the total mass of the acrylic adhesive composition.

[0016] As a further solution of the present invention: the acrylate pre-emulsion is obtained by blending 43g of distilled water, 1.2g of sodium dodecyl sulfate, 0.6-0.7g of polyethylene glycol octylphenyl ether, and 20.9-28.5g of acrylate monomers.

[0017] As a further solution of the present invention: the acrylic acid ester monomer is obtained by mixing isooctyl acrylate, butyl acrylate and methyl methacrylate in a mass ratio of 20-24:20-24:10.

[0018] As a further embodiment of the present invention: the method for preparing nanoparticles comprises the following steps:

[0019] A1: Add anhydrous ethanol, tetrabutyl titanate and glacial acetic acid into a reaction kettle and disperse them evenly, then add nitric acid solution and disperse them evenly to obtain titanium colloid;

[0020] A2: Add nano calcium carbonate and titanium colloid into a reaction kettle, stir at room temperature for 1-3 hours, dry in an oven, and calcine in a muffle furnace to obtain nanoparticles.

[0021] As a further solution of the present invention: the nitric acid solution in A1 is obtained by mixing 0.5-1 mL nitric acid, 10 mL anhydrous ethanol, and 1 mL deionized water; the volume ratio of anhydrous ethanol, tetrabutyl titanate, glacial acetic acid, and nitric acid solution is 20-30 mL: 5-10 mL: 2 mL: 11.5-12 mL.

[0022] As a further solution of the present invention: the addition ratio of nano calcium carbonate and titanium colloid in A1 is 10g:10-50mL.

[0023] As a further solution of the present invention: the adhesive tape backing is a composite of a first elastic film, a foam core and a second elastic film.

[0024] As a further solution of the present invention: the components of the first elastic film and the second elastic film are completely consistent.

[0025] As a further solution of the present invention: the thickness of the first elastic film is consistent with that of the second elastic film.

[0026] As a further aspect of the present invention: the foam core accounts for 1-50% of the thickness of the tape backing.

[0027] As a further solution of the present invention: the thickness of the adhesive tape backing is 0.02-0.13 mm.

[0028] As a further solution of the present invention: the total thickness of the adhesive tape is 0.2-0.6 mm.

[0029] Beneficial effects of the present invention:

[0030] (1) This application uses nano-calcium carbonate as a base material and titanium colloid prepared from tetrabutyl titanate as a raw material, and loads titanium dioxide on the surface of nano-calcium carbonate to obtain nanoparticles. This application then uses the hydroxyl groups on the surface of the nanoparticles to react with phosphorus oxychloride to graft phosphoric acid groups on the surface of titanium dioxide to obtain organic nanoparticles, and then uses 4-maleimide phenol to react with the phosphoric acid groups on the surface of the organic nanoparticles to graft maleimide groups on the surface of titanium dioxide to obtain component one; finally, in the process of preparing the acrylic emulsion, component one is added to the acrylic emulsion and copolymerized with the acrylic monomer to obtain an acrylic adhesive composition. This application uses the prepared new acrylic adhesive composition as a raw material as an adhesive layer, and the adhesive layer is compounded with a tape backing used in the conventional market to obtain a highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls.

[0031] The present application grafts component one onto the molecular chain of acrylic emulsion by graft copolymerization, and the nanoparticles have good interface interaction with the acrylic emulsion, the glass transition temperature of the adhesive layer is increased, the cohesive force is increased, and thus the holding force is increased; and the nanoparticles act as the loaded calcium carbonate, the titanium dioxide on the surface of the calcium carbonate, and the phosphate groups grafted on the surface of the titanium dioxide work synergistically with the maleimide groups to effectively improve the flame retardant properties and anti-ultraviolet aging properties of the material. This product can be used at a surface temperature of -18°C to 80°C, with an operating temperature range of -40°C to 116°C, and can withstand direct ultraviolet rays for up to 12 months.

[0032] (2) The tape prepared in this application is a tape backing obtained by compounding multiple layers of elastic films, and a high-viscosity acrylic adhesive composition prepared in this application is coated on one side of the tape backing, which can be sealed around screws, nails and U-shaped staples to further reduce moisture ingress, and passed the ASTM D1970 standard test before and after thermal cycling. Component 1 prepared in this application is cross-linked with the acrylic emulsion molecular chain, effectively improving the linear structure of pure acrylic emulsion, resulting in low density of the film and easy entry of water vapor into the interior of the film. Component 1 prepared in this application is cross-linked with the acrylic emulsion molecules to give the material good air tightness and water tightness. The prepared tape is a film that can isolate air, moisture and water, coated with a strong, high-viscosity pressure-sensitive acrylic adhesive. It is not only compatible with most sealants (including synthetic rubber, butyl, polyurethane, silicone and silane-terminated hybrid sealants) and building materials (including concrete, concrete blocks, anodized aluminum, galvanized metal, plywood, extruded polystyrene and most exterior wall gypsum boards), but also can reduce air leakage and uncontrolled airflow in the enclosing structure and prevent moisture from entering; when used in most buildings, lightweight rolls can be used for primer-free construction, which effectively improves the construction speed compared to traditional airtight tapes that require primers. DETAILED DESCRIPTION

[0033] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1 The method for preparing nanoparticles comprises the following steps:

[0035] A1: 0.5 mL nitric acid, 10 mL anhydrous ethanol, and 1 mL deionized water are mixed to obtain a nitric acid solution;

[0036] A2: Add 20 mL of anhydrous ethanol, 10 mL of tetrabutyl titanate, and 2 mL of glacial acetic acid into a reaction kettle and disperse them evenly, then add 11.5 mL of nitric acid solution and disperse them evenly to obtain titanium colloid;

[0037] A3: Add 10 g of nano-calcium carbonate and 20 mL of titanium colloid into a reactor, stir at room temperature for 3 h, dry in an oven, and calcine in a muffle furnace (heating rate 5 °C / min, heating to 500 °C, calcining for 5 h) to obtain nanoparticles.

[0038] Example 2 The preparation method of the acrylic adhesive composition comprises the following steps:

[0039] S1: 10 g of the nanoparticles prepared in Example 1 and 100 mL of toluene were added to a reaction kettle, the temperature was controlled at 70° C., 5 g of phosphorus oxychloride was added, the reaction was kept warm for 2 h, sodium hydroxide was added to adjust the pH to 7, the reaction was washed and dried to obtain organic nanoparticles;

[0040] S2: Add 10 g of organic nanoparticles, 15 g of 4-maleimidophenol, and 100 mL of toluene into a reaction bottle, control the temperature at 60°C, keep the reaction warm for 3 h, wash with water, and dry to obtain component 1;

[0041] S3: 43 g of distilled water, 1.2 g of sodium lauryl sulfate, 0.7 g of polyethylene glycol octylphenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate are blended to obtain an acrylate pre-emulsion;

[0042] S4: Add 16.3g of distilled water, 0.3g of sodium bicarbonate, and 13g of acrylate pre-emulsion into a reactor and disperse them evenly. Control the temperature at 75°C, add 0.1g of ammonium persulfate, continue to heat until the emulsion turns blue, keep warm for 0.5h, add 65g of acrylate pre-emulsion, keep warm for 1h, add 5g of component 1 and 0.3g of ammonium persulfate, keep warm for 1h, control the temperature at 80°C, keep warm for 1h, add ammonia water to adjust the pH to neutral, filter, and obtain an acrylic adhesive composition.

[0043] Example 3 The preparation method of the acrylic adhesive composition comprises the following steps:

[0044] S1: 10 g of the nanoparticles prepared in Example 1 and 150 mL of toluene were added to a reaction kettle, the temperature was controlled at 80° C., 7 g of phosphorus oxychloride was added, the reaction was kept warm for 3 h, sodium hydroxide was added to adjust the pH to 7, the reaction was washed and dried to obtain organic nanoparticles;

[0045] S2: Add 10 g of organic nanoparticles, 20 g of 4-maleimidophenol, and 150 mL of toluene into a reaction bottle, control the temperature to 70°C, keep the reaction for 4 h, wash with water, and dry to obtain component 1;

[0046] S3: 43 g of distilled water, 1.2 g of sodium lauryl sulfate, 0.7 g of polyethylene glycol octylphenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate are blended to obtain an acrylate pre-emulsion;

[0047] S4: Add 16.3g of distilled water, 0.3g of sodium bicarbonate, and 13g of acrylate pre-emulsion into a reactor and disperse them evenly. Control the temperature at 80°C, add 0.1g of ammonium persulfate, continue to heat until the emulsion glows blue, keep warm for 0.5h, add 65g of acrylate pre-emulsion, keep warm for 1.5h, add 5g of component 1 and 0.3g of ammonium persulfate, keep warm for 1.5h, control the temperature at 85°C, keep warm for 1.5h, add ammonia water to adjust the pH to neutral, filter, and obtain an acrylic adhesive composition.

[0048] Example 4 The preparation method of the acrylic adhesive composition comprises the following steps:

[0049] S1: 10 g of the nanoparticles prepared in Example 1 and 200 mL of toluene were added to a reaction kettle, the temperature was controlled at 80° C., 7 g of phosphorus oxychloride was added, the reaction was kept warm for 3 h, sodium hydroxide was added to adjust the pH to 7, and the reaction was performed by washing and drying to obtain organic nanoparticles;

[0050] S2: 10 g of organic nanoparticles, 25 g of 4-maleimidophenol, and 200 mL of toluene were added to a reaction bottle, the temperature was controlled at 80°C, the reaction was kept warm for 6 h, washed with water, and dried to obtain component 1;

[0051] S3: 43 g of distilled water, 1.2 g of sodium lauryl sulfate, 0.7 g of polyethylene glycol octylphenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate are blended to obtain an acrylate pre-emulsion;

[0052] S4: Add 16.3g of distilled water, 0.3g of sodium bicarbonate, and 13g of acrylate pre-emulsion into a reactor and disperse them evenly. Control the temperature at 85°C, add 0.1g of ammonium persulfate, continue to heat until the emulsion turns blue, keep warm for 1h, add 65g of acrylate pre-emulsion, keep warm for 2h, add 5g of component 1 and 0.3g of ammonium persulfate, keep warm for 2h, control the temperature at 90°C, keep warm for 2h, add ammonia water to adjust the pH to neutral, filter, and obtain an acrylic adhesive composition.

[0053] Example 5 A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Example 2, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0054] Example 6 A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Example 3, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0055] Example 7 A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Example 4, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0056] Comparative Example 1 The preparation method of the acrylic adhesive composition comprises the following steps:

[0057] S1: 10 g titanium dioxide and 150 mL toluene were added into a reaction kettle, the temperature was controlled at 80°C, 7 g phosphorus oxychloride was added, the reaction was kept warm for 3 h, sodium hydroxide was added to adjust the pH to 7, the reaction was washed and dried to obtain organic nanoparticles;

[0058] S2: Add 10 g of organically modified nanoparticles, 20 g of 4-maleimidophenol, and 150 mL of toluene into a reaction flask, control the temperature at 70 °C, keep the temperature for 4 h, wash with water and dry to obtain Component 1;

[0059] S3: Blend 43 g of distilled water, 1.2 g of sodium dodecyl sulfate, 0.7 g of polyethylene glycol octyl phenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate to obtain an acrylate pre-emulsion;

[0060] S4: Add 16.3 g of distilled water, 0.3 g of sodium bicarbonate, and 13 g of the acrylate pre-emulsion into a reaction kettle and disperse evenly. Control the temperature at 80 °C, add 0.1 g of ammonium persulfate, continue to heat up until the emulsion turns blue, keep the temperature for 0.5 h, add 65 g of the acrylate pre-emulsion, keep the temperature for 1.5 h, add 5 g of Component 1 and 0.3 g of ammonium persulfate, keep the temperature for 1.5 h, control the temperature at 85 °C, keep the temperature for 1.5 h, add ammonia water to adjust the pH to neutral, and filter to obtain an acrylic adhesive composition.

[0061] Comparative Example 2 The preparation method of the acrylic adhesive composition includes the following steps;

[0062] S1: Add 10 g of the nanoparticles prepared in Example 1 and 150 mL of toluene into a reaction kettle, control the temperature at 80 °C, add 7 g of phosphorus oxychloride, keep the temperature for 3 h, add sodium hydroxide to adjust the pH to 7, wash and dry to obtain organically modified nanoparticles;

[0063] S2: Blend 43 g of distilled water, 1.2 g of sodium dodecyl sulfate, 0.7 g of polyethylene glycol octyl phenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate to obtain an acrylate pre-emulsion;

[0064] S3: Add 16.3 g of distilled water, 0.3 g of sodium bicarbonate, and 13 g of the acrylate pre-emulsion into a reaction kettle and disperse evenly. Control the temperature at 80 °C, add 0.1 g of ammonium persulfate, continue to heat up until the emulsion turns blue, keep the temperature for 0.5 h, add 65 g of the acrylate pre-emulsion, keep the temperature for 1.5 h, add 5 g of the organically modified nanoparticles and 0.3 g of ammonium persulfate, keep the temperature for 1.5 h, control the temperature at 85 °C, keep the temperature for 1.5 h, add ammonia water to adjust the pH to neutral, and filter to obtain an acrylic adhesive composition.

[0065] Comparative Example 3 The preparation method of the acrylic adhesive composition includes the following steps;

[0066] S1: Blend 43 g of distilled water, 1.2 g of sodium dodecyl sulfate, 0.7 g of polyethylene glycol octyl phenyl ether, 10 g of isooctyl acrylate, 10 g of butyl acrylate, and 5 g of methyl methacrylate to obtain an acrylate pre-emulsion;

[0067] S2: 16.3 g of distilled water, 0.3 g of sodium bicarbonate, and 13 g of acrylate pre-emulsion were added to the reactor and dispersed evenly. The temperature was controlled at 80° C., 0.1 g of ammonium persulfate was added, and the temperature was continued to rise until the emulsion glowed blue, and the mixture was kept warm for 0.5 h. 65 g of acrylate pre-emulsion was added, and the mixture was kept warm for 1.5 h. 5 g of the nanoparticles prepared in Example 1 and 0.3 g of ammonium persulfate were added, and the mixture was kept warm for 1.5 h. The temperature was controlled at 85° C., and the mixture was kept warm for 1.5 h. Ammonia water was added to adjust the pH to neutral, and the mixture was filtered to obtain an acrylic adhesive composition.

[0068] Comparative Example 4: A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Comparative Example 1, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0069] Comparative Example 5: A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Comparative Example 2, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0070] Comparative Example 6: A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, the tape comprising a tape backing and an adhesive layer covering one side of the tape backing; the tape backing is a composite of a first elastic film, a foam core and a second elastic film; the tape backing has a thickness of 0.13 mm, the foam core has a thickness of 0.07 mm, and the first elastic film and the second elastic film have a thickness of 0.03 mm; the adhesive layer is made of the acrylic adhesive composition prepared in Comparative Example 3, the adhesive layer has a thickness of 0.12 mm, and the total thickness of the tape is 0.25 mm.

[0071] Performance Testing

[0072] (1) Initial adhesion: The test was conducted according to GB / T 4852-2002 “Test method for initial adhesion of pressure-sensitive adhesive tapes (rolling ball method)” and the sliding distance was tested using a 13# small ball. The test results are shown in Table 1.

[0073] (2) Adhesion: According to GB / T 4851-1998 “Test method for adhesion of pressure-sensitive adhesive tapes”, the bonding area is 25.4 mm × 25.4 mm, and the adhesion test is carried out under freeze-thaw cycle conditions: -30℃ / 2h→23℃ / 1h→90℃ / 2h as one cycle, and the cycle is repeated 50 times; the test results are shown in Table 1;

[0074] (3) 180° peel strength: According to GB / T 2792-1998 “Test method for 180° peel strength of pressure-sensitive tape”, anodized aluminum alloy plate (150 mm × 25 mm × 2 mm) and float glass (150 mm × 30 mm × 8 mm) were bonded with tape, and then the peel strength test was performed at a test speed of 300 mm / min. The test results are shown in Table 1.

[0075] Table 1: Statistical table of adhesive performance test data of adhesive tapes prepared in Examples 5-7 and Comparative Examples 4-6

[0076]

[0077] As can be seen from Table 1, the acrylic adhesive composition prepared in the present application, as the adhesive layer of the tape, gives the tape excellent initial adhesion and lasting adhesion, and has a high peel strength at -18 to 80°C, and the tape has a wide operating temperature range.

[0078] (4) Water absorption rate: The acrylic adhesive compositions prepared in Examples 2-4 and Comparative Examples 1-3 were made into films and cut into 2 cm × 2 cm small pieces, which were weighed and recorded as m 0 Then soak the small piece in distilled water for 48 hours, take it out and use filter paper to absorb the excess water on the surface, weigh it and record it as m 1 , the water absorption rate η of the film is calculated according to the following formula:

[0079] η=[(m 1 -m 0 ) / m 0 ]×100%

[0080] In the formula, η-water absorption rate, %; m 0 - Initial weight of film, g; m 1 -The weight of the film after absorbing water, m; the test results are shown in Table 2;

[0081] (5) Resistance to moisture and heat aging: The acrylic adhesive compositions prepared in Examples 2-4 and Comparative Examples 1-3 were made into adhesive films and adhered to the surface of the plate. The films were placed in a constant temperature box at 65°C and 85% RH for 24 hours. After being taken out and cooled, the peel strength was tested. The test results are shown in Table 2.

[0082] (6) UV aging resistance: The acrylic adhesive compositions prepared in Examples 2-4 and Comparative Examples 1-3 were made into adhesive films and adhered to the surface of the plate. The films were placed under a ZSZ-30 type UV lamp (wavelength 313 nm, 80 mm from the lamp tube, treatment for 120 h). After being taken out and cooled, the peel strength was tested. The test results are shown in Table 2.

[0083] Table 2: Statistical table of performance test data of Examples 2-4 and Comparative Examples 1-3

[0084]

[0085] It can be seen from Table 2 that the adhesive tape prepared in the present application isolates water and air, and has good protection for the bonding part; and it still maintains a high bonding strength in a hot and humid environment and a high ultraviolet radiation environment.

[0086] (7) Flame retardant properties: tested according to GB / T 15903-1995 “Test method for flame resistance of pressure-sensitive adhesive tapes - Suspension method”. The test results are shown in Table 3.

[0087] Table 3: Statistical table of flame retardant performance test data of Examples 2-4 and Comparative Examples 1-3

[0088]

[0089] It can be seen from Table 3 that the acrylic adhesive composition prepared in the present application has good flame retardancy and self-extinguishing properties.

[0090] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A highly flame-retardant, aging-resistant, water-blocking and airtight tape for building exterior walls, characterized in that: The adhesive tape comprises an adhesive tape backing and an adhesive layer covering one side of the adhesive tape backing; the adhesive layer is made of an acrylic adhesive composition; The preparation method of the acrylic adhesive composition comprises the following steps: S1: Add nanoparticles and toluene into a reaction kettle, control the temperature at 70-90°C, add phosphorus oxychloride, keep the temperature for 2-4 hours, adjust the pH to 7-7.5, wash and dry to obtain organic nanoparticles; S2: adding the organic nanoparticles, 4-maleimidophenol and toluene into a reaction bottle, controlling the temperature at 60-80°C, keeping the temperature for reaction for 3-6 hours, washing with water and drying to obtain component 1; S3: Add distilled water, sodium bicarbonate, and acrylic ester pre-emulsion component 1 to a reaction kettle and disperse them evenly, control the temperature at 75-85°C, add initiator component 1, continue to heat until the emulsion glows blue, keep warm for 0.5-1h, add acrylic ester pre-emulsion component 2, keep warm for 1-2h, add component 1 and initiator component 2, keep warm for 1-2h, control the temperature at 80-90°C, keep warm for 1-2h, adjust the pH to neutral, filter, and obtain an acrylic adhesive composition; The method for preparing the nanoparticles comprises the following steps: A1: Add anhydrous ethanol, tetrabutyl titanate and glacial acetic acid into a reaction kettle and disperse them evenly, then add nitric acid solution and disperse them evenly to obtain titanium colloid; A2: Add nano calcium carbonate and titanium colloid into a reaction kettle, stir at room temperature for 1-3 hours, dry in an oven, and calcine in a muffle furnace to obtain nanoparticles.

2. A highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: The addition ratio of nanoparticles, toluene, and phosphorus oxychloride in S1 is 10 g: 100-200 mL: 5-10 g.

3. A highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: The addition ratio of the organized nanoparticles, 4-maleimidophenol, and toluene in S2 is 10 g: 15-25 g: 100-200 mL.

4. The highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: In S3, both the acrylate pre-emulsion component 1 and the acrylate pre-emulsion component 2 are acrylate pre-emulsions; the mass ratio of the acrylate pre-emulsion component 1 to the acrylate pre-emulsion component 2 is 5:25-26.5; the acrylate pre-emulsion accounts for 70-82% of the total mass of the acrylic adhesive composition.

5. The highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: Initiator component one and initiator component two are both ammonium persulfate; the mass ratio of initiator component one to initiator component two is 1:2-3; ammonium persulfate accounts for 0.3-0.4% of the total mass of the acrylic adhesive composition; sodium bicarbonate accounts for 0.2-0.5% of the total mass of the acrylic adhesive composition; component one accounts for 4-8% of the total mass of the acrylic adhesive composition.

6. A highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 4, characterized in that: The acrylate pre-emulsion is obtained by blending 43g of distilled water, 1.2g of sodium dodecyl sulfate, 0.6-0.7g of polyethylene glycol octylphenyl ether, and 20.9-28.5g of acrylate monomers.

7. A highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 6, characterized in that: The acrylic acid ester monomer is obtained by mixing isooctyl acrylate, butyl acrylate and methyl methacrylate in a mass ratio of 20-24:20-24:

10.

8. The highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: The nitric acid solution in A1 is obtained by mixing 0.5-1 mL nitric acid, 10 mL anhydrous ethanol, and 1 mL deionized water; the volume ratio of anhydrous ethanol, tetrabutyl titanate, glacial acetic acid, and nitric acid solution is 20-30 mL: 5-10 mL: 2 mL: 11.5-12 mL.

9. The highly flame-retardant, aging-resistant, water-blocking and airtight adhesive tape for building exterior walls according to claim 1, characterized in that: The addition ratio of nano calcium carbonate and titanium colloid in A2 is 10g:10-50mL.

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