Reworkable flame-retardant heat-conducting adhesive film and preparation method thereof

Abstract

The invention discloses a reworkable flame-retardant heat-conducting adhesive film and a preparation method thereof.The reworkable flame-retardant heat-conducting adhesive film comprises a reworkable flame-retardant heat-conducting adhesive layer, and the reworkable flame-retardant heat-conducting adhesive layer is prepared from, by weight, 15-25 parts of acrylate, 10-15 parts of block polymer, 3-5 parts of hydrogenated rosin resin, 10-15 parts of ethyl acetate and 5-10 parts of xylene. The coating is prepared from the following components in parts by weight: 0.5 to 1.5 parts of diisononyl phthalate, 25 to 35 parts of aluminum nitride powder, 25 to 35 parts of aluminum oxide powder, 4 to 6 parts of phosphorus-nitrogen powder, 1 to 2 parts of isocyanate, 2 to 3 parts of polyether amine copolymer, 1 to 1.5 parts of modified acrylate and 0.5 to 3 parts of modified polysiloxane. The adhesive has an excellent tensile effect, and the raw material section is combined with various block copolymers through acrylic acid, so that the adhesive has viscosity and tensile property; compared with an easy-to-pull adhesive, the easy-to-pull adhesive also realizes high heat conductivity, so that in the application process, the heat dissipation of an electronic product is better, and the tensile property is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to a reworkable flame-retardant and heat-conducting adhesive film and a preparation method thereof. Background Art

[0002] With the rapid development of electronics and electrical technologies, people's demand for electronic products is increasing, and the requirements for electronic products are also getting higher and higher. Especially after LEDs are used as lighting devices and enter people's lives, the requirements for the heat dissipation performance of circuit boards are also getting higher and higher. Therefore, some aluminum-based circuit boards with high heat dissipation performance are welcomed by the market. At present, the basic structure of the aluminum substrate on the market is formed by laying a layer of thermally conductive insulating sheet on an aluminum plate, which can play a role in heat conduction on the one hand and insulation on the other hand.

[0003] Existing electronic products may cause electronic device failures or reduce the service life of electronic components due to heat accumulation, and it is easy to damage other components and leave residual glue when repairing or replacing parts. For this reason, we propose a reworkable flame-retardant and heat-conducting adhesive film and a preparation method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a reworkable flame-retardant and heat-conducting adhesive film and a preparation method thereof, so as to solve the problems in the prior art that electronic products may cause electronic device failures or reduce the service life of electronic components due to heat accumulation, and it is easy to damage other components and leave residual glue when repairing or replacing parts.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A reworkable flame-retardant and heat-conducting adhesive film, including a reworkable flame-retardant and heat-conducting adhesive layer, and the reworkable flame-retardant and heat-conducting adhesive layer includes the following raw materials in parts by weight: 15-25 parts of acrylate, 10-15 parts of block polymer, 3-5 parts of hydrogenated rosin resin, 10-15 parts of ethyl acetate, 5-10 parts of xylene, 0.5-1.5 parts of diisononyl phthalate, 25-35 parts of aluminum nitride powder, 25-35 parts of alumina powder, 4-6 parts of phosphorus and nitrogen powder, 1-2 parts of isocyanate, 2-3 parts of polyetheramine copolymer, 1-1.5 parts of modified acrylate, and 0.5-3 parts of modified polysiloxane.

[0006] Preferably, release layers are provided on both sides of the reworkable flame-retardant and heat-conducting adhesive layer.

[0007] A preparation method of a reworkable flame-retardant and heat-conducting adhesive film includes the following steps:

[0008] S1. Raw material preparation: Prepare raw materials according to parts by weight;

[0009] S2. Preliminary mixing of raw materials:

[0010] (1) Add acrylate, block polymer, diisononyl phthalate, hydrogenated rosin resin and xylene into a reaction kettle, and stir for reaction;

[0011] (2) Add polyetheramine copolymer, modified acrylate, ethyl acetate, aluminum nitride powder, aluminum oxide powder, and phosphorus nitride powder into the reaction kettle in sequence, and stir for reaction;

[0012] S3. Re-mix the raw materials: Add (1) and (2) obtained in S2, isocyanate, and modified polysiloxane into the reaction kettle in sequence, and evacuate and disperse;

[0013] S4. Filtration: Filter the liquid in the reaction kettle, take the filtrate, and obtain the raw material of the reworkable flame-retardant and heat-conducting adhesive film;

[0014] S5. Coating: Coat the raw material of S4 on the release layer to obtain the finished product of the reworkable flame-retardant and heat-conducting adhesive film.

[0015] Preferably, in (1) of S2, the stirring speed is 400 - 600 r / min, control the dispersion and melting for 4H, and control the reaction temperature not higher than 60 - 80 °C.

[0016] Preferably, in (2) of S2, the stirring speed is 800 - 1000 r / min, control the dispersion and melting for 1H, and control the reaction temperature at 30 - 40 °C.

[0017] Preferably, the reaction conditions in S3 are: First, disperse at a speed of 800 - 1000 r / min for 20 - 30 min until the filler is completely dispersed; then evacuate and disperse at a speed of 300 - 500 r / min for 5 - 10 min.

[0018] Compared with the prior art, the beneficial effects of the present invention are: It has excellent tensile effect. Through the combination of acrylic acid and various block copolymers in the raw material section, it has both adhesiveness and stretchability. Compared with the easy-to-pull adhesive, this application also realizes high heat conduction, so that during the application process, not only the heat dissipation of electronic products is better, but also the tensile performance is improved simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0020] Figure 1 is the structural schematic diagram of the present invention;

[0021] Figure 2 is the flow chart of the present invention.

[0022] In the figure: 1. Reworkable flame-retardant and heat-conducting adhesive layer; 2. Release layer. Detailed implementation mode

[0023] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention.

[0024] Please refer to Figure 1-2 , in an embodiment of the present invention, a reworkable flame-retardant and heat-conductive adhesive film includes a reworkable flame-retardant and heat-conductive adhesive layer, and the reworkable flame-retardant and heat-conductive adhesive layer includes the following raw materials in parts by weight: 15-25 parts of acrylate, 10-15 parts of block polymer, 3-5 parts of hydrogenated rosin resin, 10-15 parts of ethyl acetate, 5-10 parts of xylene, 0.5-1.5 parts of diisononyl phthalate, 25-35 parts of aluminum nitride powder, 25-35 parts of aluminum oxide powder, 4-6 parts of phosphonitrilic powder, 1-2 parts of isocyanate, 2-3 parts of polyetheramine copolymer, 1-1.5 parts of modified acrylate, and 0.5-3 parts of modified polysiloxane.

[0025] Release layers are provided on both sides of the reworkable flame-retardant and heat-conductive adhesive layer.

[0026] A preparation method of a reworkable flame-retardant and heat-conductive adhesive film includes the following steps:

[0027] S1. Raw material preparation: Prepare raw materials according to the following parts by weight: 15-25 parts of acrylate, 10-15 parts of block polymer, 3-5 parts of hydrogenated rosin resin, 10-15 parts of ethyl acetate, 5-10 parts of xylene, 0.5-1.5 parts of diisononyl phthalate, 25-35 parts of aluminum nitride powder, 25-35 parts of aluminum oxide powder, 4-6 parts of phosphonitrilic powder, 1-2 parts of isocyanate, 2-3 parts of polyetheramine copolymer, 1-1.5 parts of modified acrylate, and 0.5-3 parts of modified polysiloxane;

[0028] S2. Preliminary mixing of raw materials:

[0029] (1). Add acrylate, block polymer, diisononyl phthalate, hydrogenated rosin resin and xylene into a reaction kettle, stir and react, the stirring speed is 400-600 r / min, control the dispersion and melting for 4H, and control the reaction temperature not higher than 60-80 °C;

[0030] (2) Add polyetheramine copolymer, modified acrylate, ethyl acetate, aluminum nitride powder, aluminum oxide powder, and phosphorus nitride powder into the reaction kettle in sequence, stir and react. The stirring speed is 800 - 1000 r / min, control the dispersion and melting for 1 h, and control the reaction temperature at 30 - 40 °C;

[0031] S3. Re - mix the raw materials: Add (1) and (2) obtained in S2, isocyanate, and modified polysiloxane into the reaction kettle in sequence, evacuate and disperse. First, disperse at a speed of 800 - 1000 r / min for 20 - 30 min until the fillers are completely dispersed; then evacuate and disperse at a speed of 300 - 500 r / min for 5 - 10 min;

[0032] S4. Filtration: Filter the liquid in the reaction kettle, take the filtrate to obtain the raw material of the reworkable flame - retardant and heat - conductive adhesive film;

[0033] S5. Coating: Coat the raw material in S4 on the release layer to obtain the finished product of the reworkable flame - retardant and heat - conductive adhesive film.

[0034] The working principle of the present invention is:

[0035] S1. Raw material preparation: Prepare raw materials according to the following weight parts: 15 - 25 parts of acrylate, 10 - 15 parts of block polymer, 3 - 5 parts of hydrogenated rosin resin, 10 - 15 parts of ethyl acetate, 5 - 10 parts of xylene, 0.5 - 1.5 parts of diisononyl phthalate, 25 - 35 parts of aluminum nitride powder, 25 - 35 parts of aluminum oxide powder, 4 - 6 parts of phosphorus nitride powder, 1 - 2 parts of isocyanate, 2 - 3 parts of polyetheramine copolymer, 1 - 1.5 parts of modified acrylate, 0.5 - 3 parts of modified polysiloxane.

[0036] S2. Preliminary mixing of raw materials: (1) Add acrylate, block polymer, diisononyl phthalate, hydrogenated rosin resin, and xylene into the reaction kettle, stir at a speed of 400 - 600 r / min, control the dispersion and melting for 4 h, and control the reaction temperature not higher than 60 - 80 °C; (2) Add polyetheramine copolymer, modified acrylate, ethyl acetate, aluminum nitride powder, aluminum oxide powder, and phosphorus nitride powder into the reaction kettle in sequence, control the grinding and stirring speed at 800 - 1000 r / min, melt for 1 h, and control the reaction temperature at 30 - 40 °C.

[0037] S3. Re - mix the raw materials: Add (1) and (2) obtained in S2, isocyanate, and modified polysiloxane into the reaction kettle in sequence, disperse at a speed of 800 - 1000 r / min for 20 - 30 min until the fillers are completely dispersed; then evacuate and disperse at a speed of 300 - 500 r / min for 5 - 10 min,

[0038] S4. Filtration: Filter the liquid in the reaction kettle, take the filtrate to obtain the raw material of the reworkable flame retardant thermal conductive adhesive film.

[0039] S5. Coating: Coat the raw material obtained in S4 on the release layer to obtain the finished product of the reworkable flame retardant thermal conductive adhesive film.

[0040] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reworkable flame retardant thermally conductive adhesive film, characterized in that: The invention comprises a reworkable flame retardant thermal conductive adhesive layer, which comprises the following raw materials in parts by weight: 15-25 parts of acrylate, 10-15 parts of block polymer, 3-5 parts of hydrogenated rosin resin, 10-15 parts of ethyl acetate, 5-10 parts of xylene, 0.5-1.5 parts of diisononyl phthalate, 25-35 parts of aluminum nitride powder, 25-35 parts of aluminum oxide powder, 4-6 parts of phosphorus nitrogen powder, 1-2 parts of isocyanate, 2-3 parts of polyetheramine copolymer, 1-1.5 parts of modified acrylate and 0.5-3 parts of modified polysiloxane.

2. The reworkable flame-retardant thermally conductive adhesive film according to claim 1, characterized in that: Release layers are arranged on both sides of the reworkable flame-retardant thermally conductive adhesive layer.

3. A method for preparing a reworkable flame-retardant thermally conductive adhesive film according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Raw material preparation: prepare raw materials by weight; S2. Preliminary mixing of raw materials: (1) Add acrylate, block polymer, diisononyl phthalate, hydrogenated rosin resin and xylene into a reaction kettle and stir to react; (2) Add polyetheramine copolymer, modified acrylate, ethyl acetate, aluminum nitride powder, aluminum oxide powder, and phosphorus nitrogen powder into the reaction kettle in sequence and stir to react; S3, mixing the raw materials again: adding (1) and (2), isocyanate and modified polysiloxane obtained in S2 into the reaction kettle in sequence, and dispersing them under vacuum; S4, filtration: filtering the liquid in the reaction kettle, taking the filtrate, and obtaining the raw material of the flame-retardant thermal conductive adhesive film of Kezhong; S5, coating: coating the S4 raw material on the release layer to obtain the finished product of the flame retardant thermal conductive adhesive film.

4. The reworkable flame-retardant thermally conductive adhesive film and the preparation method thereof according to claim 3, characterized in that: In (1) of S2, the stirring speed is 400-600 r / min, the dispersion smelting is controlled for 4 hours, and the reaction temperature is controlled not to be higher than 60-80°C.

5. The reworkable flame-retardant thermally conductive adhesive film and the preparation method thereof according to claim 4, characterized in that: In (2) of S2, the stirring speed is 800-1000 r / min, the dispersion smelting is controlled for 1 hour, and the reaction temperature is controlled at 30-40°C.

6. A reworkable flame-retardant thermally conductive adhesive film and a preparation method thereof according to claim 5, characterized in that: The reaction conditions in S3 are: firstly disperse at a speed of 800-1000 r / min for 20-30 min until the filler is completely dispersed; then, vacuum disperse at a speed of 300-500 r / min for 5-10 min.

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