UV (ultraviolet) moisture dual-curing narrow frame edge fixing adhesive

Abstract

The invention discloses a UV (ultraviolet) moisture dual-curing narrow bezel sizing adhesive, which is prepared from the following materials in percentage by weight: 30 to 40 percent of low-Tg polyurethane acrylate; 30 to 40% of UV (ultraviolet) and moisture dual-curing polyurethane acrylate; 10 to 20% of a monofunctional low TgUV monomer; 3-5% of fumed silica; and 4.5 to 7% of a photoinitiator. According to the invention, the colloid is in a liquid state in a normal temperature state, after dispensing, the colloid can be quickly cured by UV light, so that a glue layer with a large height-width ratio can be conveniently formed, and the glue layer after UV light curing is a solid glue layer, has certain sub-sensitivity, is convenient for a frame to quickly position and has certain initial bonding force; and then a normal-temperature moisture curing process is carried out in a warehouse for 3-5 days, so that a firm structural bonding effect can be formed without occupying a production line.

Description

Technical Field

[0001] The invention relates to the technical field of edge glue, in particular to a UV moisture dual-curing narrow frame edge glue. Background Art

[0002] With the continuous development of electronic products and technological iterations, display screens are moving towards narrow bezels, and adhesives are needed to bond screen bezels during the preparation process.

[0003] Deficiencies of existing technology: Traditional moisture-curing polyurethane hot melt adhesives have the following disadvantages during use: Before applying the glue, the glue needs to be heated to reduce its viscosity before construction, which is not convenient enough; After the glue is applied, the glue layer is liquid when heated, and the aspect ratio is too small to meet the needs of narrow frames; After gluing, the frame is pressed together because the glue layer is in liquid state, which is prone to overflow. Cleaning the overflowed glue is time-consuming and laborious. After the narrow frame is pressed together, it needs to be heated and pressed for a long time to achieve the initial bonding and positioning functions, which requires a larger construction site and reduces production efficiency. Summary of the invention

[0004] The object of the present invention is to provide a UV moisture dual-curing narrow frame trimming adhesive to solve the problems raised in the above background technology.

[0005] A UV moisture dual-curing narrow frame adhesive, composed of the following materials in proportion by weight: Low Tg polyurethane acrylate, 30-40%; UV moisture dual-cure polyurethane acrylate, 30-40%; Monofunctional low TgUV monomer, 10-20%; Fumed silica, 3-5%; The photoinitiator is 4.5-7%. The low Tg polyurethane acrylate contains repeated segments of caprolactone and polybutadiene flexible groups, and the glass transition temperature (Tg) is ≤-40°C. The UV moisture dual-curing polyurethane acrylate contains repeated segments of caprolactone, polybutadiene and polycarbonate flexible groups, and the isocyanate group (NCO) content is 8-12%. The monofunctional low Tg UV monomer includes any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, isodecyl acrylate, isooctyl acrylate, butyl acrylate and tetrahydrofuran acrylate.

[0006] As a further improvement of the present invention, the fumed silica is organic silicon modified hydrophobic fumed silica with a specific surface area of ​​≥150 m2 / g and a particle size of <1 μm.

[0007] As a further improvement of the present invention, the photoinitiator includes photoinitiator TPO and photoinitiator 184, wherein: Photoinitiator TPO, 0.5-1%; Photoinitiator 184, 4-6%.

[0008] As a further improvement of the present invention, a method for preparing and using a UV moisture dual-curing narrow frame edge adhesive is provided, and the method for preparing and using the narrow frame edge adhesive comprises the following steps: a. preparing adhesive solution; b. dispensing and curing; and c. moisture curing.

[0009] As a further improvement of the present invention, step a, preparation of glue solution: weigh low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer, fumed silica and photoinitiator according to the formula ratio, and mix the low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer and fumed silica, heat and stir evenly, then add the photoinitiator and stir evenly to obtain glue solution.

[0010] As a further improvement of the present invention, step b, glue point curing: the glue obtained in step a is applied to the narrow frame for glue point curing, and after the glue point curing is completed by ultraviolet radiation for 1-5 seconds.

[0011] As a further improvement of the present invention, step c, moisture curing: the narrow frame that has completed the glue curing in step b is pressed together and transported to a warehouse for a 3-5 day room temperature moisture curing process, which does not occupy the production line and can form a strong structural bonding effect.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The colloid in the present invention is liquid at room temperature, and can be quickly cured by UV light after dispensing to be qualitative, so as to form a glue layer with a relatively large height and width ratio. The glue layer after UV light curing is a solid glue layer with certain sub-sensitivity, which is convenient for rapid positioning of the frame and has a certain initial bonding force. After that, a room temperature and moisture curing process is carried out in a warehouse for 3-5 days, which does not occupy the production line, and can form a strong structural bonding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flow chart of the preparation and use of a UV moisture dual-curing narrow frame trimming adhesive. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe 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.

[0015] See also Figure 1 The present invention provides the following technical solution: a UV moisture dual-curing narrow frame adhesive, characterized in that it is composed of the following materials in proportion by weight: Low Tg polyurethane acrylate, 30%, low Tg polyurethane acrylate contains repeating segments of caprolactone and polybutadiene flexible groups, with a glass transition temperature (Tg) ≤ -40°C; UV moisture dual-cure polyurethane acrylate, 30%, UV moisture dual-cure polyurethane acrylate contains repeating segments of caprolactone, polybutadiene and polycarbonate flexible groups, and an isocyanate group (NCO) content of 8-12%; Monofunctional low TgUV monomer, 10%, monofunctional low TgUV monomer includes any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, isodecyl acrylate, isooctyl acrylate, butyl acrylate and tetrahydrofuran acrylate; Fumed silica, 3%, fumed silica is organosilicon-modified hydrophobic fumed silica, with a specific surface area of ​​≥150m2 / g and a particle size of <1μm; Photoinitiator, 4.5%. The photoinitiator includes photoinitiator TPO and photoinitiator 184, wherein: photoinitiator TPO, 0.5%; photoinitiator 184, 4%.

[0016] A method for preparing and using a UV moisture dual-curing narrow frame edge glue, the method comprising the following steps: a. preparing glue solution; b. dispensing glue curing; c. moisture curing; Step a, preparation of glue solution: weigh 300 parts of low Tg polyurethane acrylate, 300 parts of UV moisture dual-curing polyurethane acrylate, 100 parts of monofunctional low TgUV monomer, 30 parts of fumed silica and 45 parts of photoinitiator according to the formula ratio, and mix the low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer and fumed silica, heat and stir evenly, then add the photoinitiator and stir evenly to obtain glue solution; Step b, glue point curing: Apply the glue obtained in step a to the narrow frame for glue point curing, and after the glue point curing is completed, it is irradiated with ultraviolet light for 1 second; Step c, moisture curing: The narrow frame that has been cured by glue in step b is pressed together and transported to a warehouse for a 5-day room temperature moisture curing process, which does not occupy the production line and can form a strong structural bonding effect.

[0017] See also Figure 1 The present invention provides the following technical solution: a UV moisture dual-curing narrow frame adhesive, characterized in that it is composed of the following materials in proportion by weight: Low Tg polyurethane acrylate, 40%, low Tg polyurethane acrylate contains repeating segments of caprolactone and polybutadiene flexible groups, with a glass transition temperature (Tg) ≤ -40°C; UV moisture dual-curing polyurethane acrylate, 30-40%, UV moisture dual-curing polyurethane acrylate contains repeating segments of caprolactone, polybutadiene and polycarbonate flexible groups, and the isocyanate group (NCO) content is 8-12%; Monofunctional low TgUV monomer, 20%, monofunctional low TgUV monomer includes any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, isodecyl acrylate, isooctyl acrylate, butyl acrylate and tetrahydrofuran acrylate; Fumed silica, 5%, fumed silica is organosilicon-modified hydrophobic fumed silica, with a specific surface area of ​​≥150m2 / g and a particle size of <1μm; Photoinitiator, 7%. The photoinitiator includes photoinitiator TPO and photoinitiator 184, wherein: photoinitiator TPO, 1%; photoinitiator 184, 6%.

[0018] A method for preparing and using a UV moisture dual-curing narrow frame edge glue, the method comprising the following steps: a. preparing glue solution; b. dispensing glue curing; c. moisture curing; Step a, preparation of glue solution: weigh 400 parts of low Tg polyurethane acrylate, 400 parts of UV moisture dual-curing polyurethane acrylate, 200 parts of monofunctional low TgUV monomer, 50 parts of fumed silica and 70 parts of photoinitiator according to the formula ratio, and mix the low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer and fumed silica, heat and stir evenly, then add the photoinitiator and stir evenly to obtain glue solution; Step b, glue point curing: Apply the glue obtained in step a to the narrow frame for glue point curing, and after the glue point curing is completed, it is irradiated with ultraviolet light for 1 second; Step c, moisture curing: The narrow frame that has been cured by glue in step b is pressed together and transported to a warehouse for a 5-day room temperature moisture curing process, which does not occupy the production line and can form a strong structural bonding effect.

[0019] The adhesive solutions in Example 1 and Example 2 were divided into 50 portions for bonding strength testing (the bonding objects were glass and glass), and the following table was obtained: It can be seen from Table 1 that the bonding strength after UV curing (glass to glass) is 3-5MPa, and the bonding strength of glass to glass after 5 days of moisture curing (25°C, 60% humidity) is ≥10MPa. The higher the content of UV moisture dual-curing polyurethane acrylate, the greater the aspect ratio. The higher the content of UV moisture dual-curing polyurethane acrylate, the greater the final bonding strength. The colloid of the present invention has a room temperature viscosity of 30000-40000mpa.s. After dispensing, it can be shaped by ultraviolet radiation curing for 1 second. After the frame is pressed, it is bonded through a room temperature moisture curing process for 5 days, and the bonding strength can reach more than 10MPa. After dispensing, it can be quickly subjected to UV light curing for qualitative purposes, which is convenient for forming a glue layer with a large aspect ratio. The glue layer after UV light curing is a solid glue layer with certain subsensitivity, which is convenient for rapid positioning of the frame and plays a certain initial bonding force. After that, a room temperature moisture curing process of 3-5 days is carried out in the warehouse, which does not occupy the production line, and a strong structural bonding effect can be formed.

[0020] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A UV moisture dual-curing narrow frame adhesive, characterized by: The following materials are weighted composition: Low Tg polyurethane acrylate, 30-40%; UV moisture dual-cure polyurethane acrylate, 30-40%; Monofunctional low TgUV monomer, 10-20%; Fumed silica, 3-5%; Photoinitiator, 4.5-7%.

2. The low Tg polyurethane acrylate contains repeating segments of caprolactone and polybutadiene flexible groups, and the glass transition temperature (Tg) is ≤-40°C. The UV moisture dual-curing polyurethane acrylate contains repeating segments of caprolactone, polybutadiene and polycarbonate flexible groups, and the isocyanate group (NCO) content is 8-12%. The monofunctional low Tg UV monomer includes any one or more of hydroxyethyl acrylate, hydroxypropyl acrylate, isodecyl acrylate, isooctyl acrylate, butyl acrylate and tetrahydrofuran acrylate.

3. The UV moisture dual-curing narrow frame adhesive according to claim 1, characterized in that: The fumed silica is organic silicon modified hydrophobic fumed silica with a specific surface area of ​​≥150 m2 / g and a particle size of <1 μm.

4. The UV moisture dual-curing narrow frame adhesive according to claim 1, characterized in that: The photoinitiator includes photoinitiator TPO and photoinitiator 184, wherein: Photoinitiator TPO, 0.5-1%; Photoinitiator 184, 4-6%.

5. The method for preparing and using the UV moisture dual-curing narrow frame adhesive according to any one of claims 1 to 3, characterized in that: The preparation and use method comprises the following steps: a. preparation of glue solution; b. point-dispensing curing; and c. moisture curing.

6. The method for preparing and using the UV moisture dual-curing narrow frame adhesive according to claim 4, characterized in that: Step a, preparation of glue solution: weigh low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer, fumed silica and photoinitiator according to the formula ratio, and mix the low Tg polyurethane acrylate, UV moisture dual-curing polyurethane acrylate, monofunctional low TgUV monomer and fumed silica, heat and stir evenly, then add the photoinitiator and stir evenly to obtain glue solution.

7. The method for preparing and using the UV moisture dual-curing narrow frame adhesive according to claim 5, characterized in that: Step b, glue point curing: Apply the glue obtained in step a to the narrow frame for glue point curing. After the glue point curing is completed, it is irradiated with ultraviolet light for 1-5 seconds.

8. The method for preparing and using the UV moisture dual-curing narrow frame adhesive according to claim 6, characterized in that: Step c, moisture curing: The narrow frame that has been cured by glue in step b is pressed together and transported to a warehouse for 3-5 days of room temperature moisture curing, which does not occupy the production line and can form a strong structural bonding effect.

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