Preparation method of high-performance backing film adhesive tape

Abstract

The invention provides a preparation method of a high-performance backing film adhesive tape, and belongs to the technical field of adhesives, the preparation method of the high-performance backing film adhesive tape comprises the following steps: (1) preparing an acrylic acid solution: mixing acrylate and an initiator to obtain the acrylic acid solution; (2) dissolving polyurethane rubber in a solvent to react, adding an acrylic acid solution, uniformly mixing, reacting at a constant temperature, adding the residual initiator, and reacting at a constant temperature to obtain modified acrylic resin; and (3) mixing and stirring the modified acrylic resin, rosin resin and a curing agent to obtain the high-performance backing film adhesive tape. According to the high-performance backing film adhesive tape, the methyl methacrylate, the ethoxylated trimethylolpropane triacrylate and the ethylene glycol dimethacrylate are modified by adopting the polyurethane rubber, so that the obtained high-performance backing film adhesive tape not only has excellent flexibility, but also has better cohesiveness.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of adhesives, and particularly relates to a preparation method of high-performance bottom supporting film adhesive tape. BACKGROUND

[0002] The adhesive tape is mainly composed of a substrate and a layer of adhesive coated on one or both surfaces of the substrate, and is adhered to the surface of an object by forming a bond between the adhesive molecules on the substrate and the surface molecules of the object. According to the function, the adhesive tape can be divided into high-temperature adhesive tape, pressure-sensitive adhesive tape, insulating adhesive tape, special adhesive tape, die-cutting adhesive tape, etc.

[0003] At present, PET adhesive tape is used as a bottom supporting film during the processing of many roll die-cutting products. Generally, the surface of the PET is first treated with a silicon-free release agent, and then coated with an acrylic pressure-sensitive adhesive to form an adhesive tape. Most of the bottom supporting films used in the existing die-cutting industry adopt this method. However, this method cannot normally tear off the adhesive tape in the subsequent process, and the adhesive residue is easily adhered to the back surface. Moreover, the entire operation process is low in efficiency and high in cost.

[0004] A kind of acrylic pressure-sensitive adhesive tape that can replace die-cutting bottom supporting film is disclosed in Chinese patent CN112760066A, which includes the following raw materials in weight percentage: butyl acrylate 60-70 parts, methyl methacrylate 20-25 parts, acrylic acid 10-15 parts, 0.5-2.5 parts of 0.25% BPO monomer mass ethyl acetate solution, 100-110 parts of glue solution, 1-2.5 parts of polyisocyanate dissolved in toluene and ethyl acetate, and 0.5-2.5 parts of toluene solution of epoxy resin. The acrylic pressure-sensitive adhesive tape and its preparation method that can replace die-cutting bottom supporting film have been partially polymerized before configuration. After drying in an oven for further reaction, the glue immediately has sufficient cohesive force, and can be directly rolled into an adhesive tape. By adjusting the glue and various curing agents, the glue has been crosslinked after drying in the oven, and the cohesive force reaches the normal level. When rolled into an adhesive tape, it can be torn off completely without adhesive residue on the back surface. However, the toughness and adhesive performance of the adhesive tape are not ideal.

[0005] In the prior art, acrylic resin is blended with resin to improve toughness and adhesive performance. However, there is a problem of poor compatibility between acrylic resin and resin, and the formula and process of the adhesive need to be further optimized to improve its toughness and adhesive performance. Based on the problems existing in the prior art, a preparation method of high-performance bottom supporting film adhesive tape needs to be developed. SUMMARY

[0006] Based on the problems existing in the prior art, the present invention aims to provide a method for preparing high-performance bottom-support film tape. The present invention modifies methyl methacrylate, ethylene oxide trimethylolpropane triacrylate, and ethylene glycol dimethacrylate with polyurethane rubber, so that the adhesive of the obtained high-performance bottom-support film tape not only has excellent flexibility, but also better adhesion.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing a high-performance backing film tape includes the following steps: (1) Preparation of acrylic acid solution: Methyl methacrylate, ethoxylated trimethylolpropane triacrylate, ethylene glycol dimethacrylate and 10-20 wt% initiator are mixed to obtain acrylic acid solution; (2) Dissolve polyurethane rubber in a solvent, add 30-50 wt% initiator under an inert gas protective atmosphere, mix evenly and react at a constant temperature, add acrylic acid solution, mix evenly and react at a constant temperature, add the remaining initiator and react at a constant temperature to obtain modified acrylic resin. (3) Mix and stir the modified acrylic resin, rosin resin and curing agent to obtain the high-performance backing film tape.

[0008] The mass ratio of methyl methacrylate, ethoxylated trimethylolpropane triacrylate, and ethylene glycol dimethacrylate in step (1) above is 30-50:5-10:1-3; preferably 40:7:1.

[0009] Preferably, the composition includes 8-12 parts of polyurethane rubber, 30-50 parts of methyl acrylate, 5-10 parts of trimethylolpropane triacrylate, 1-3 parts of ethylene glycol dimethacrylate, 0.1-0.3 parts of initiator, and 120-250 parts of solvent.

[0010] Preferably, the composition includes 10 parts polyurethane rubber, 40 parts methyl methacrylate, 7 parts ethoxylated trimethylolpropane triacrylate, 1 part ethylene glycol dimethacrylate, 0.2 parts initiator, and 180 parts solvent.

[0011] The density of the polyurethane rubber is 1.5 g / cm³. 3 -1.80g / cm 3 .

[0012] The initiator is benzoyl peroxide.

[0013] The solvent is ethyl acetate.

[0014] The curing agent is hexamethylene diisocyanate.

[0015] The mass ratio of the modified acrylic resin, rosin resin and curing agent is 1:0.3-0.5:0.002-0.005; preferably 1:0.4:0.003.

[0016] The high-performance backing film tape prepared above is coated onto an aluminum foil layer, cured, and post-treated to obtain aluminum foil tape.

[0017] As a preferred embodiment, the method for preparing the adhesive for aluminum foil tape includes the following steps: (1) Preparation of acrylic acid solution: Mix 40 parts of methyl methacrylate, 7 parts of ethoxylated trimethylolpropane triacrylate, 1 part of ethylene glycol dimethacrylate and 0.03 parts of benzoyl peroxide to obtain acrylic acid solution; (2) Dissolve 10 parts of polyurethane rubber in 180 parts of ethyl acetate. Under an inert gas protective atmosphere at 80°C, add 0.08 parts of benzoyl peroxide, mix evenly, and react at a constant temperature for 2.5 hours. Raise the temperature to 90°C, add acrylic acid solution, mix evenly, and react at a constant temperature for 1 hour. Add the remaining benzoyl peroxide and react at a constant temperature for 2 hours to obtain modified acrylic resin. (3) Mix 100 parts of modified acrylic resin, 40 parts of rosin resin and 0.3 parts of hexamethylene diisocyanate to obtain high-performance bottom film tape; (4) Coat the aluminum foil layer with high-performance backing film tape, cure, and post-process to obtain aluminum foil tape.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention introduces polyurethane rubber into the synthesized acrylic resin. The resulting modified acrylic resin material is a tape that not only has better toughness but also excellent adhesion.

[0019] (2) In the implementation of this invention, a variety of polypropylene resins are used as raw materials, and the mass ratio of methyl methacrylate, ethoxylated trimethylolpropane triacrylate and ethylene glycol dimethacrylate is controlled to be 30-50:5-10:1-3. The combination modification of acrylates with different molecular weights can make the modified acrylic resin have better adhesion and stability.

[0020] (3) The high-performance bottom film tape prepared by the present invention has good toughness and good adhesion, and the system is stable. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: A method for preparing a high-performance backing film tape, comprising the following steps: (1) Preparation of acrylic acid solution: Mix 40 parts of methyl methacrylate, 7 parts of ethoxylated trimethylolpropane triacrylate, 1 part of ethylene glycol dimethacrylate and 0.03 parts of benzoyl peroxide to obtain acrylic acid solution; (2) Dissolve 10 parts of polyurethane rubber in 180 parts of ethyl acetate. Under an inert gas protective atmosphere at 80°C, add 0.08 parts of benzoyl peroxide, mix evenly, and react at a constant temperature for 2.5 hours. Raise the temperature to 90°C, add acrylic acid solution, mix evenly, and react at a constant temperature for 1 hour. Add the remaining benzoyl peroxide and react at a constant temperature for 2 hours to obtain modified acrylic resin. (3) Mix 100 parts of modified acrylic resin, 40 parts of rosin resin and 0.3 parts of hexamethylene diisocyanate to obtain high-performance bottom film tape.

[0023] A high-performance backing film tape is coated onto an aluminum foil layer, cured, and post-treated to obtain aluminum foil tape.

[0024] Example 2: A method for preparing a high-performance backing film tape, comprising the following steps: (1) Preparation of acrylic acid solution: Mix 50 parts of methyl methacrylate, 10 parts of ethoxylated trimethylolpropane triacrylate, 3 parts of ethylene glycol dimethacrylate and 0.06 parts of benzoyl peroxide to obtain acrylic acid solution; (2) Dissolve 12 parts of polyurethane rubber in 250 parts of ethyl acetate. Under an inert gas protective atmosphere at 80°C, add 0.15 parts of benzoyl peroxide, mix evenly, and react at a constant temperature for 2.5 hours. Raise the temperature to 90°C, add acrylic acid solution, mix evenly, and react at a constant temperature for 1 hour. Add the remaining benzoyl peroxide and react at a constant temperature for 2 hours to obtain modified acrylic resin. (3) Mix 100 parts of modified acrylic resin, 50 parts of rosin resin and 0.5 parts of hexamethylene diisocyanate to obtain high-performance bottom film tape.

[0025] A high-performance backing film tape is coated onto an aluminum foil layer, cured, and post-treated to obtain aluminum foil tape.

[0026] Example 3: A method for preparing a high-performance backing film tape, comprising the following steps: (1) Preparation of acrylic acid solution: Mix 30 parts of methyl methacrylate, 5 parts of ethoxylated trimethylolpropane triacrylate, 2 parts of ethylene glycol dimethacrylate and 0.02 parts of benzoyl peroxide to obtain acrylic acid solution; (2) Dissolve 8 parts of polyurethane rubber in 120 parts of ethyl acetate. Under an inert gas protective atmosphere at 80°C, add 0.03 parts of benzoyl peroxide, mix evenly, and react at a constant temperature for 2.5 hours. Raise the temperature to 90°C, add acrylic acid solution, mix evenly, and react at a constant temperature for 1 hour. Add the remaining benzoyl peroxide and react at a constant temperature for 2 hours to obtain modified acrylic resin. (3) Mix 100 parts of modified acrylic resin, 30 parts of rosin resin and 0.2 parts of hexamethylene diisocyanate to obtain high-performance bottom film tape.

[0027] A high-performance backing film tape is coated onto an aluminum foil layer, cured, and post-treated to obtain aluminum foil tape.

[0028] Comparative Example 1 The difference from Example 1 is that ethylene glycol dimethacrylate is replaced with 2-hydroxyethyl acrylate, otherwise it is the same as Example 1.

[0029] Comparative Example 2 The difference from Example 1 is that polyurethane rubber is replaced with polyisobutylene rubber, otherwise it is the same as Example 1.

[0030] Effect test 1. Adhesion test The holding time of the high-performance backing film adhesive prepared in Examples 1-3 and Comparative Examples 1-2 on a 1kg weight was determined with reference to the standard GB / T 4851-2014 "Test Method for Holding Strength of Adhesive Tapes". The longer the holding time, the better the adhesion. The test results are shown in Table 1 below.

[0031] Table 1

[0032] According to the test results in Table 1 above; The high-performance backing film tape prepared in Examples 1-3 of this invention has better adhesion performance, and the holding time can reach more than 1800 min, with good adhesion.

[0033] In Comparative Example 1, changing the type of acrylate significantly affects the adhesion performance of the high-performance backing film tape, resulting in a significant reduction in holding time. This may be because the modification of polyurethane resin with 2-hydroxyethyl acrylate does not improve the adhesion of acrylate, thus shortening the bonding time.

[0034] In Comparative Example 2, changing the type of rubber significantly reduced the bonding performance of the high-performance backing film tape. The predicted reason may be that the modification of polyisobutylene rubber with methyl methacrylate, trimethylolpropane triacrylate and ethylene glycol dimethacrylate cannot effectively improve the bonding performance of acrylates, thereby shortening the bonding time.

[0035] 2. Peelability test The high-performance backing film tapes prepared in Examples 1-3 and Comparative Examples 1-2 were adhered to the glass surface, and the peel force at 180°C, 30°C, and 50°C was tested using a peel force tester. The test conditions were 50 N and 300 mm / min. The test results are shown in Table 2 below. Table 2

[0036] According to the test results in Table 2 above; The high-performance backing film tapes prepared in Examples 1-3 of this invention have better peel strength, and their peel strength is relatively high under normal temperature, low temperature and high temperature conditions.

[0037] In Comparative Example 1, changing the type of acrylate significantly affects the peel strength of the high-performance backing film tape, resulting in a significant decrease in peel strength under normal temperature, low temperature, and high temperature conditions. This may be because the modification of polyurethane resin with 2-hydroxyethyl acrylate does not improve the adhesion of the acrylate, thus weakening the peel performance.

[0038] In Comparative Example 2, changing the type of rubber significantly reduced the peel strength of the high-performance backing film tape under both low and high temperature conditions. The predicted reason may be that the modification of polyisobutylene rubber with methyl methacrylate, trimethylolpropane triacrylate and ethylene glycol dimethacrylate cannot effectively improve the high and low temperature adhesion of acrylate, thereby reducing the high and low temperature peel strength.

[0039] 3. Elongation at break The high-performance backing film tapes prepared in Examples 1-3 and Comparative Examples 1-2 were tested according to GB / T1040, and the test results are shown in Table 3 below.

[0040] Table 3

[0041] According to the test results in Table 3 above; The high-performance backing film tape prepared in Examples 1-3 of this invention has better elongation at break, which can reach more than 310% and can reach up to 325%, indicating that the tape prepared by this invention has better flexibility.

[0042] In Comparative Example 1, changing the type of acrylate significantly reduced the elongation at break of the high-performance backing film tape. This may be because the modification of polyurethane resin with 2-hydroxyethyl acrylate does not better preserve the resin's flexibility, thus leading to a decrease in elongation at break.

[0043] In Comparative Example 2, changing the type of rubber also significantly reduced the elongation at break of the high-performance backing film tape. The predicted reason may be that the modification of polyisobutylene rubber with methyl methacrylate, trimethylolpropane triacrylate and ethylene glycol dimethacrylate cannot retain the flexibility of the resin well, thus leading to a decrease in elongation at break.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a high-performance backing film tape, characterized in that: Includes the following steps: (1) Preparation of acrylic acid solution: Methyl methacrylate, ethoxylated trimethylolpropane triacrylate, ethylene glycol dimethacrylate and 10-20 wt% initiator are mixed to obtain acrylic acid solution; (2) Dissolve polyurethane rubber in a solvent, add 30-50 wt% initiator under an inert gas protective atmosphere, mix evenly and react at a constant temperature, add acrylic acid solution, mix evenly and react at a constant temperature, add the remaining initiator and react at a constant temperature to obtain modified acrylic resin. (3) Mix the modified acrylic resin, rosin resin and curing agent to obtain the high-performance backing film tape.

2. The preparation method according to claim 1, characterized in that: The mass ratio of methyl methacrylate, ethoxylated trimethylolpropane triacrylate, and ethylene glycol dimethacrylate in step (1) is 30-50:5-10:1-3.

3. The preparation method according to claim 2, characterized in that: The mass ratio of methyl methacrylate, ethoxylated trimethylolpropane triacrylate, and ethylene glycol dimethacrylate in step (1) is 40:7:

1.

4. The preparation method according to claim 1, characterized in that: The composition includes 8-12 parts of polyurethane rubber, 30-50 parts of methyl acrylate, 5-10 parts of trimethylolpropane triacrylate, 1-3 parts of ethylene glycol dimethacrylate, 0.1-0.3 parts of initiator, and 120-250 parts of solvent.

5. The preparation method according to claim 4, characterized in that: The composition includes 10 parts polyurethane rubber, 40 parts methyl methacrylate, 7 parts ethoxylated trimethylolpropane triacrylate, 1 part ethylene glycol dimethacrylate, 0.2 parts initiator, and 180 parts solvent.

6. The preparation method according to claim 5, characterized in that: The density of the polyurethane rubber is 1.5 g / cm³. 3 -1.80g / cm 3； The initiator is benzoyl peroxide; the solvent is ethyl acetate; and the curing agent is hexamethylene diisocyanate.

7. The preparation method according to claim 1, characterized in that: The mass ratio of the modified acrylic resin, rosin resin and curing agent is 1:0.3-0.5:0.002-0.

005.

8. The preparation method according to claim 7, characterized in that: The mass ratio of the modified acrylic resin, rosin resin and curing agent is 1:0.4:0.

003.

9. The high-performance backing film tape prepared by the preparation method according to any one of claims 1-8 is coated onto an aluminum foil layer, cured, and post-treated to obtain an aluminum foil tape.

10. The method for preparing aluminum foil tape according to claim 9, characterized in that: Includes the following steps: (1) Preparation of acrylic acid solution: Mix 40 parts of methyl methacrylate, 7 parts of ethoxylated trimethylolpropane triacrylate, 1 part of ethylene glycol dimethacrylate and 0.03 parts of benzoyl peroxide to obtain acrylic acid solution; (2) Dissolve 10 parts of polyurethane rubber in 180 parts of ethyl acetate. Under an inert gas protective atmosphere at 80°C, add 0.08 parts of benzoyl peroxide, mix evenly, and react at a constant temperature for 2.5 hours. Raise the temperature to 90°C, add acrylic acid solution, mix evenly, and react at a constant temperature for 1 hour. Add the remaining benzoyl peroxide and react at a constant temperature for 2 hours to obtain modified acrylic resin. (3) Mix 100 parts of modified acrylic resin, 40 parts of rosin resin and 0.3 parts of hexamethylene diisocyanate to obtain high-performance bottom film tape; (4) Coat the aluminum foil layer with high-performance backing film tape, cure, and post-process to obtain aluminum foil tape.

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