Adhesive film for bonding indoor glass and assembly and preparation method of adhesive film

Abstract

The invention discloses an adhesive film for bonding indoor glass and an assembly and a preparation method of the adhesive film, and belongs to the technical field of photovoltaic assemblys.Self-made acrylic pressure-sensitive adhesive resin is adopted in the adhesive film, vinyl acetate (flexible chain segments) and aluminum acetylacetonate are introduced, dynamic cross-linking points are formed, reversible bonding is formed, the thermal expansion and cold contraction properties of the adhesive film are improved, and the adhesive film has the advantages that the adhesive film is not prone to deformation; glue layer cracking caused by thermal expansion and cold contraction of the glass curtain wall can be avoided; the adhesive film has adhesive force at normal temperature, can be directly used for adhesion of glass and a photovoltaic module, and is cured by natural light irradiation, and the construction process is simple.

Description

Technical Field

[0001] This invention belongs to the field of photovoltaic module technology, specifically relating to an adhesive film for bonding indoor glass to modules and its preparation method. Background Technology

[0002] Photovoltaic curtain wall modules are high-tech products that combine solar photovoltaic power generation technology with building curtain wall design, serving multiple functions such as power generation, enclosure, and decoration. On the one hand, the demand for high-quality glass curtain walls in high-end commercial buildings and landmark buildings continues to grow; on the other hand, with the popularization of green building concepts, energy-saving, environmentally friendly, and intelligent glass curtain wall products are gradually gaining market favor. Currently, the UV adhesive film used for bonding photovoltaic modules to glass curtain walls does not cure sufficiently deep within the glass curtain wall, and the construction efficiency of thermosetting adhesive films is low. Moreover, the thermal expansion and contraction of glass curtain walls can easily lead to cracking of the adhesive layer, affecting the bonding effect. Summary of the Invention

[0003] This invention provides an adhesive film for bonding indoor glass to components and its preparation method. The adhesive film has adhesive strength at room temperature, the construction process is simple, and it can directly bond photovoltaic components to glass curtain walls. The adhesive film is cured by ultraviolet light irradiation to achieve structural curing and improve adhesive strength.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An adhesive film for bonding indoor glass to components comprises the following components by weight percentage: 20%-40% self-made acrylic pressure-sensitive adhesive resin, 40%-60% epoxy resin, 2%-6% photocuring initiator, 5%-20% cationic monomer, and 1%-3% leveling agent.

[0005] The epoxy resin is one or more of the following: aliphatic modified epoxy resin, bisphenol A epoxy resin, polyurethane modified epoxy resin, organosilicon modified epoxy resin, and alicyclic epoxy resin.

[0006] The photocuring initiator is one or more of the following: diphenyl-(4-phenylthio)phenylsulfonium hexafluoroantimonate, di[4-diphenylthiooniumphenyl]sulfide dihexafluoroantimonate, 4-(phenylthio)phenyldiphenylthioonium hexafluorophosphate, bis(4-(diphenylthio)phenyl)sulfide-bishexafluorophosphate, and bis(4-tert-butylphenyl)iodoonium hexafluorophosphate.

[0007] The cationic monomer is one or more of 3-oxetane methacrylate, bis(3-ethyl-3-oxetane)methane, 3-oxetanediethanol, 3-ethyl-3-hydroxymethyloxetane, and 3-methyl-3-oxetanemethanol.

[0008] The leveling agent is a polyether-modified polysiloxane or a polyester-modified polysiloxane.

[0009] The preparation method of the self-made acrylic pressure-sensitive adhesive resin includes the following steps: (1) Place ethyl acetate and toluene in a reaction vessel and stir at a constant temperature of 60℃ for 30 min; (2) Mix isooctyl acrylate, vinyl acetate, acrylic acid and BPO evenly, add the mixture dropwise over 30 minutes, and continue to keep warm and stir for 30 minutes after the mixture is added. (3) Mix toluene and BPO evenly, and add the mixture dropwise within 10 min. Heat the mixture to 80°C and keep it at that temperature for 30 min. (4) Cool the reactor to 60°C, mix acetylacetone, aluminum acetylacetone, ethyl acetate and rosin evenly, add them to the reactor, stir for 20 minutes, cool to 40°C, filter the material through a 200-mesh filter to obtain acrylic pressure-sensitive adhesive resin.

[0010] In the steps described above, the mass ratio of ethyl acetate to toluene in step 1 is 6:1; In step 2, the mass ratio of isooctyl acrylate, vinyl acetate, acrylic acid, and BPO is 7.5:1.5:0.5:0.1. In step 1, the mass ratio of ethyl acetate to vinyl acetate in step 2 is 4:1; In step 3, the mass ratio of toluene to BPO is 10:1; The mass ratio of BPO in step 2 to step 3 is 2:1; In step 4, the mass ratio of acetylacetone, aluminum acetylacetone, ethyl acetate, and rosin is 1:1:2:1. In step 2, the mass ratio of vinyl acetate to aluminum acetylacetonate in step 4 is 3:1.

[0011] The above-mentioned method for preparing the adhesive film for bonding indoor glass and components includes the following steps: mixing the components in proportion, stirring evenly, and coating to obtain a photo-thermal curing adhesive film.

[0012] The coating thickness is 70-120μm.

[0013] Beneficial effects: This invention provides an adhesive film for bonding indoor glass to components and its preparation method. The adhesive film uses a self-made acrylic pressure-sensitive adhesive resin, and incorporates vinyl acetate (flexible segments) and aluminum acetylacetonate to form dynamic cross-linking points and reversible bonds. This improves the thermal expansion and contraction properties of the adhesive film, preventing cracking of the adhesive layer caused by the thermal expansion and contraction of the glass curtain wall. Furthermore, the adhesive film of this invention has adhesive strength at room temperature, and the construction process is simple, allowing direct bonding of components to the glass curtain wall. Ultraviolet curing is achieved using sunlight, relying on natural light for curing and saving on UV equipment investment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the film coating process in an embodiment of the present invention; Figure 2 This is a schematic diagram of the finished adhesive film structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the adhesive component in an embodiment of the present invention. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: The preparation of acrylic pressure-sensitive adhesive resin includes the following steps: (1) Place 120g of ethyl acetate and 20g of toluene at the bottom of the reactor and stir at a constant temperature of 60℃ for 30min; (2) Mix 150g isooctyl acrylate, 30g vinyl acetate, 10g acrylic acid and 2g BPO evenly, add the mixture dropwise over 30 minutes, and continue to keep warm and stir for 30 minutes after the mixture is added. (3) Mix 10g of toluene with 1g of BPO until homogeneous, and add the mixture dropwise over 10 minutes. Heat to 80°C and maintain the temperature for 30 minutes. (4) Cool the reactor to 60°C, mix 10g acetylacetone, 10g aluminum acetylacetone, 20g ethyl acetate and 10g rosin evenly, add to the reactor, stir for 20min, cool to 40°C, and filter through a 200-mesh filter to obtain acrylic pressure-sensitive adhesive resin.

[0016] Example 1

[0017] The preparation of the adhesive film using the aforementioned self-made acrylic pressure-sensitive adhesive resin includes the following steps: Take 30% by weight of self-made acrylic pressure-sensitive adhesive resin, 43% of silicone-modified epoxy resin, 5% of diphenyl-(4-phenylthio)phenylsulfonium hexafluoroantimonate, 20% of 3-oxetane methacrylate, and 2% of polyether-modified polysiloxane; mix thoroughly and stir evenly. Then, use the following method: Figure 1 The coating is applied in the manner shown to obtain the desired result. Figure 2 The photo-thermal curing adhesive film shown.

[0018] Example 2

[0019] The preparation of the adhesive film using the aforementioned self-made acrylic pressure-sensitive adhesive resin includes the following steps: Take 25% of self-made acrylic pressure-sensitive adhesive resin, 55% of bisphenol A epoxy resin, 3% of 4-(phenylthio)phenyldiphenylthionium hexafluorophosphate, 15% of 3-oxetanediethanol, and 2% of polyether-modified polysiloxane by weight percentage; mix thoroughly and stir evenly. Then, use a method such as... Figure 1 The coating is applied in the manner shown to obtain the desired result. Figure 2The photo-thermal curing adhesive film shown.

[0020] Example 3

[0021] The preparation of the adhesive film using the aforementioned self-made acrylic pressure-sensitive adhesive resin includes the following steps: Take 35% of self-made acrylic pressure-sensitive adhesive resin, 45% of alicyclic epoxy resin, 4% of diphenyl-(4-phenylthio)phenylsulfonium hexafluoroantimonate, 15% of 3-ethyl-3-hydroxymethyloxetane, and 1% of polyether-modified polysiloxane by weight percentage; mix thoroughly and stir until homogeneous. Then, use a method such as... Figure 1 The coating is applied in the manner shown to obtain the desired result. Figure 2 The photo-thermal curing adhesive film shown.

[0022] The photo-thermo-curable adhesive film prepared above also has adhesiveness at room temperature, such as... Figure 3 As shown, the photo-thermal curing adhesive film prepared in the above embodiment is used for bonding curtain wall glass and solar modules. After bonding, the adhesive film can be cured by irradiation with natural light. Moreover, the introduction of vinyl acetate (flexible segment) and aluminum acetylacetonate into the adhesive film forms dynamic cross-linking points and reversible bonds, which improves the thermal expansion and contraction properties of the adhesive film. Even if there are temperature changes, the bonding effect of the adhesive film will not be affected.

[0023] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be considered within the scope of protection of the present invention.

Claims

1. An adhesive film for bonding indoor glass to components, characterized in that, It is composed of the following components by weight percentage: 20%-40% homemade acrylic pressure-sensitive adhesive resin, 40%-60% epoxy resin, 2%-6% photocuring initiator, 5%-20% cationic monomer, and 1%-3% leveling agent.

2. The adhesive film for bonding indoor glass and components according to claim 1, characterized in that, The preparation method of the self-made acrylic pressure-sensitive adhesive resin includes the following steps: (1) Place ethyl acetate and toluene in a reaction vessel and stir at a constant temperature of 60℃ for 30 min; (2) Mix isooctyl acrylate, vinyl acetate, acrylic acid and BPO evenly, add the mixture dropwise over 30 minutes, and continue to keep warm and stir for 30 minutes after the mixture is added. (3) Mix toluene and BPO evenly, and add the mixture dropwise within 10 min. Heat the mixture to 80°C and keep it at that temperature for 30 min. (4) Cool the reactor to 60°C, mix acetylacetone, aluminum acetylacetone, ethyl acetate and rosin evenly, add them to the reactor, stir for 20 minutes, cool to 40°C, filter and discharge to obtain acrylic pressure-sensitive adhesive resin.

3. The adhesive film for bonding indoor glass and components according to claim 2, characterized in that, In step (1), the mass ratio of ethyl acetate to toluene is 6:1; in step (2), the mass ratio of isooctyl acrylate, vinyl acetate, acrylic acid, and BPO is 7.5:1.5:0.5:0.1; in step (3), the mass ratio of toluene to BPO is 10:1; and in step (4), the mass ratio of acetylacetone, aluminum acetylacetone, ethyl acetate, and rosin is 1:1:2:

1.

4. The adhesive film for bonding indoor glass to components according to claim 2 or 3, characterized in that, In step (1), the mass ratio of ethyl acetate to vinyl acetate in step 2 is 4:

1.

5. The adhesive film for bonding indoor glass to components according to claim 2 or 3, characterized in that, The mass ratio of BPO in step (2) to step (3) is 2:

1.

6. The adhesive film for bonding indoor glass to components according to claim 2 or 3, characterized in that, In step (2), the mass ratio of vinyl acetate to aluminum acetylacetonate in step (4) is 3:

1.

7. The adhesive film for bonding indoor glass and components according to claim 1, characterized in that, The epoxy resin is one or more of the following: aliphatic modified epoxy resin, bisphenol A epoxy resin, polyurethane modified epoxy resin, organosilicon modified epoxy resin, and alicyclic epoxy resin.

8. The adhesive film for bonding indoor glass and components according to claim 1, characterized in that, The photocuring initiator is one or more of the following: diphenyl-(4-phenylthio)phenylsulfonium hexafluoroantimonate, di[4-diphenylthiooniumphenyl]sulfide dihexafluoroantimonate, 4-(phenylthio)phenyldiphenylthioonium hexafluorophosphate, bis(4-(diphenylthio)phenyl)sulfide-bishexafluorophosphate, and bis(4-tert-butylphenyl)iodoonium hexafluorophosphate.

9. The adhesive film for bonding indoor glass and components according to claim 1, characterized in that, The cationic monomer is one or more of 3-oxetane methacrylate, bis(3-ethyl-3-oxetane)methane, 3-oxetanediethanol, 3-ethyl-3-hydroxymethyloxetane, and 3-methyl-3-oxetanemethanol.

10. The method for preparing the adhesive film for bonding indoor glass and components according to any one of claims 1-9, characterized in that, Includes the following steps: After mixing the components in the specified proportions and stirring evenly, the mixture is coated with a coating thickness of 70-120 μm to obtain a photo-thermal curing adhesive film.

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