Pressure-sensitive adhesive composition, preparation method of pressure-sensitive adhesive and display device

Abstract

The invention relates to a pressure-sensitive adhesive composition, a preparation method of a pressure-sensitive adhesive and a display device. The pressure-sensitive adhesive composition comprises modified acrylate, a curing agent, a first initiator and a first solvent, wherein the modified acrylate comprises acrylate, silicon resin, a second initiator and a second solvent; the silicon resin comprises a tetrafunctional chain link SiO2 and a monofunctional chain link R3SiO1 / 2, R is selected from hydrogen, alkyl, alkenyl or aromatic group, and a plurality of R in the silicon resin are selected from the same group, or a plurality of R are independently selected from different groups. The pressure-sensitive adhesive formed by the pressure-sensitive adhesive composition has excellent weather resistance, and the problems of stripping, bubbles and the like caused by poor weather resistance of the pressure-sensitive adhesive of an existing polaroid can be effectively solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a pressure-sensitive adhesive composition, a method for preparing the pressure-sensitive adhesive, and a display device. Background Art

[0002] With the progress of the times, display products are becoming more and more popular, and the application scenarios of display products are becoming more and more abundant. Among them, commercial display is a major branch of display products. In recent years, outdoor high-brightness display products have shown an upward trend year by year with an annual growth rate of 50%.

[0003] The special scenarios of outdoor use also put forward higher weather resistance requirements for displays. Among them, the weather resistance of the key component polarizer in the display faces huge challenges. In the polarizer, the pressure-sensitive adhesive bonded to the glass is usually ordinary acrylic pressure-sensitive adhesive, which is prone to peeling and bubbles in long-term outdoor high temperature and high UV environment, seriously affecting the performance of the display. Summary of the invention

[0004] The embodiments of the present application provide a pressure-sensitive adhesive composition, a method for preparing the pressure-sensitive adhesive, and a display device, which can significantly improve the weather resistance of the pressure-sensitive adhesive and improve the problems of peeling, bubbles, etc. of the existing polarizer caused by the poor weather resistance of the pressure-sensitive adhesive.

[0005] In order to achieve the above-mentioned object, the present application provides a pressure-sensitive adhesive composition, which comprises: a modified acrylate, a curing agent, a first initiator and a first solvent;

[0006] Wherein, the modified acrylate comprises acrylate, silicone resin, a second initiator and a second solvent;

[0007] The silicone resin includes a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 , wherein R is selected from hydrogen, an alkyl group, an alkenyl group or an aromatic group, and multiple Rs in the silicone resin are selected from the same group, or multiple Rs are independently selected from different groups.

[0008] In some embodiments, R is selected from hydrogen, methyl, ethyl, propyl, vinyl, or phenyl.

[0009] In some embodiments, the pressure-sensitive adhesive composition comprises, by weight:

[0010] 100 parts of modified acrylate, 0.01 to 3 parts of curing agent, 0.01 to 3 parts of first initiator, 10 to 40 parts of first solvent;

[0011] The modified acrylate comprises: 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent.

[0012] In some embodiments, the acrylate includes at least one of butyl acrylate, isooctyl acrylate, methyl methacrylate, and methacrylate epoxy resin.

[0013] In some embodiments, the acrylic ester includes, by weight: 20 to 40 parts of butyl acrylate, 20 to 40 parts of isooctyl acrylate, 10 to 30 parts of methyl methacrylate, and 10 to 20 parts of methacrylic acid epoxy resin.

[0014] In some embodiments, the curing agent is selected from at least one of ethylene glycol diallyl ether, 1,6-hexanediol diacrylate, trimethylolpropane trimethacrylate, and aluminum acetylacetonate;

[0015] The first initiator and the second initiator are independently selected from at least one of dibenzoyl peroxide, azobisisobutylnitrile and cumene peroxide.

[0016] In some embodiments, the pressure-sensitive adhesive composition further comprises, by weight: 0.01 to 3 parts of an auxiliary agent and 0.01 to 1 part of an antistatic agent.

[0017] In some embodiments, the auxiliary agent is selected from at least one of a silane coupling agent, an antioxidant, and a plasticizer;

[0018] And / or, the antistatic agent is selected from at least one of lithium bis(trifluoromethanesulfonyl)imide and tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide salt.

[0019] The present application also provides a method for preparing a pressure-sensitive adhesive, the method for preparing the pressure-sensitive adhesive comprising:

[0020] Mix 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent by weight to obtain a modified acrylate;

[0021] Mixing 100 parts of the modified acrylate, 0.01 to 3 parts of a curing agent, 0.01 to 3 parts of a first initiator, and 10 to 40 parts of a first solvent by weight to obtain an adhesive solution, and drying the adhesive solution to form a pressure-sensitive adhesive;

[0022] The silicone resin is composed of a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 composition, wherein R represents hydrogen, an alkyl group, an alkenyl group or an aromatic group.

[0023] The present application also provides a display device, the display device comprising:

[0024] Display panel;

[0025] a polarizer, located on at least one side of the display panel; and

[0026] The pressure-sensitive adhesive layer is located between the polarizer and the display panel, and the pressure-sensitive adhesive layer is formed by the pressure-sensitive adhesive composition described above.

[0027] The present application provides a pressure-sensitive adhesive composition, a method for preparing the pressure-sensitive adhesive, and a display device. The pressure-sensitive adhesive composition of the present application comprises a modified acrylate, which is formed by polymerization of acrylate and silicone resin, wherein the silicone resin comprises a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 The polysiloxane resin used in the present application has a large number of Si-O bonds and Si-O-Si bonds in its structure, and the Si-O bond energy is high, so that the silicone resin of the present application has higher stability, and thus has better high temperature resistance and UV resistance. The present application uses a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 The silicone resin and acrylate undergo a polymerization reaction, and the modified acrylate obtained has excellent high temperature resistance and UV resistance. Therefore, the pressure-sensitive adhesive formed by the pressure-sensitive adhesive composition of the present application has good weather resistance, thereby being able to effectively improve the peeling, bubble and other problems of the existing polarizer caused by the poor weather resistance of the pressure-sensitive adhesive. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0029] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0030] Figure 1 is a structural schematic diagram of a display device provided in an embodiment of the present application;

[0031] Figure 2 It is a schematic diagram of the structure of another display device provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 100, display device; 110, polarizer; 101, first polarizer; 102, second polarizer; 111, polarizing layer; 112, first protective layer; 113, second protective layer; 120, pressure-sensitive adhesive layer; 121, first pressure-sensitive adhesive layer; 122, second pressure-sensitive adhesive layer; 130, display panel; 140, backlight module. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0035] The present application provides a pressure-sensitive adhesive composition, which comprises: modified acrylate, a curing agent, a first initiator and a first solvent; wherein the modified acrylate comprises acrylate, silicone resin, a second initiator and a second solvent; the silicone resin comprises a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 , wherein R is selected from hydrogen, an alkyl group, an alkenyl group or an aromatic group, and multiple Rs in the silicone resin are selected from the same group, or multiple Rs are independently selected from different groups.

[0036] Among them, the tetrafunctional link SiO2 refers to the structure:

[0037] Monofunctional chain R3SiO 1 / 2 Refers to the structure:

[0038] In the present application, the silicone resin is a polysilicon resin comprising a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2The polysiloxane resin has a highly branched three-dimensional (non-linear) structure with Si-O bonds as the skeleton; at the same time, compared with CO bonds (358.0kJ / mol) and CC bonds (304.0kJ / mol), Si-O bonds (about 460.5kJ / mol) have higher bond energy, and simple thermal motion is difficult to break Si-O bonds. Therefore, the stability of the silicone resin to heat and oxygen is much higher than that of general pressure-sensitive adhesive modified materials; due to the special structure of the silicone resin and the presence of more Si-O bonds, the silicone resin has excellent high temperature resistance and weather resistance. The present application uses the silicone resin to modify the acrylate, and through chemical modification, the silicone resin and the acrylate undergo a chemical reaction, and the silicone resin is combined with the acrylate through chemical bonds to obtain the modified acrylate. Since the structure of the silicone resin is bonded to the molecular structure of the modified acrylate, the modified acrylate has the three-dimensional structure of the silicone resin, so the weather resistance of the modified acrylate is significantly improved. The pressure-sensitive adhesive composition contains the modified acrylate, so the weather resistance of the pressure-sensitive adhesive formed by the pressure-sensitive adhesive composition is also significantly improved.

[0039] In some embodiments, the pressure-sensitive adhesive composition comprises, by weight: 100 parts of modified acrylate, 0.01 to 3 parts of curing agent, 0.01 to 3 parts of first initiator, and 10 to 40 parts of first solvent;

[0040] The modified acrylate comprises, by weight: 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent.

[0041] In the present application, when the content of each component in the pressure-sensitive adhesive composition is within the above range, the pressure-sensitive adhesive formed by the pressure-sensitive adhesive composition has better comprehensive properties, such as better adhesion, weather resistance and stability, etc. Wherein the silicone resin is 1 to 15 parts, and when the content of the silicone resin is within the above range, the weather resistance of the pressure-sensitive adhesive is better. When the content of the silicone resin in the pressure-sensitive adhesive composition is lower than the above range, the effect of improving the weather resistance of the pressure-sensitive adhesive is not achieved due to the low content of the silicone resin. When the content of the silicone resin in the pressure-sensitive adhesive composition is higher than the above range, the pressure-sensitive adhesive has disadvantages such as high curing temperature, high cost, and poor removability due to the high content of the silicone resin.

[0042] In some embodiments, the silicone resin may be an MQ silicone resin, which is composed of M units (M units refer to monofunctional segments R3SiO 1 / 2) and Q units (Q units refer to tetrafunctional chain segments SiO2). The structure of MQ silicone resin can be, but is not limited to, the structure shown in Formula I:

[0043]

[0044] It should be noted that, in the MQ silicone resin, the number of M units and Q units can be selected according to the actual functional requirements and is not limited to the number of M units and Q units in the above formula I.

[0045] MQ silicone resin is based on the tetrafunctional chain SiO2 as the core and the monofunctional chain R3SiO 1 / 2 The end-capped polysiloxane resin usually has a double-layer structure, which is reflected in its dense core-shell spheroid. The core part of the spheroid is a Q unit with a higher density, and the shell part includes an M unit with a lower density. There are more Si-O bonds in the MQ silicone resin structure. The special structure of the MQ silicone resin gives it excellent heat resistance, aging resistance, and resistance to ultraviolet radiation. Therefore, the acrylate modified by MQ silicone resin has good weather resistance and can resist the influence of severe weather conditions such as ultraviolet rays and high temperatures, so it has a long service life in outdoor applications. At the same time, the strong polar groups in the MQ silicone resin give it good bonding properties. The acrylate modified by the MQ silicone resin can improve and adjust the peeling force of the pressure-sensitive adhesive, further reducing the risk of polarizer peeling.

[0046] In some embodiments, in the silicone resin, the R represents hydrogen, methyl, ethyl, propyl, vinyl or phenyl. When the silicone resin contains multiple R, the multiple R are selected from the same group, or the multiple R are independently selected from different groups. For example, when multiple R in the silicone resin are methyl, it can be methyl MQ silicone resin; when multiple R in the silicone resin are ethyl, it can be ethyl MQ silicone resin; when multiple R in the silicone resin are propyl, it can be propyl MQ silicone resin; when multiple R in the silicone resin are vinyl, it can be vinyl MQ silicone resin; when multiple R in the silicone resin are phenyl, it can be phenyl MQ silicone resin; when some R in the silicone resin are methyl and some R are hydrogen, it can be methyl hydrogenated MQ silicone resin; when some R in the silicone resin are methyl and some R are benzene, it can be methylphenyl MQ silicone resin, but it is not limited thereto.

[0047] In some embodiments, the acrylate is the main component of the pressure-sensitive adhesive, and the acrylate may include one or more acrylic monomers. For example, the acrylate may include at least one of butyl acrylate (BA), isooctyl acrylate (2-EHA), methyl methacrylate (MMA), and methacrylate epoxy resin (GMA), but is not limited thereto.

[0048] In some embodiments, the acrylate comprises, by weight, 20 to 40 parts of butyl acrylate, 20 to 40 parts of isooctyl acrylate, 10 to 30 parts of methyl methacrylate, and 10 to 20 parts of methacrylic acid epoxy resin. When the acrylate of the present application is prepared from the above components and the content of each component is within the above range, the pressure-sensitive adhesive has better performance, such as better adhesion, stability, longer service life, etc.

[0049] In some embodiments, the first solvent and the second solvent may be ethyl acetate (EAC), but are not limited thereto.

[0050] In some embodiments, the curing agent may be selected from at least one of ethylene glycol diallyl ether (EDGMA), 1,6-hexanediol diacrylate (HDDA), trimethylolpropane trimethacrylate (TMPTMA) and aluminum acetylacetonate, for curing the modified acrylate.

[0051] In some embodiments, the first initiator and the second initiator are independently selected from at least one of dibenzoyl peroxide (BPO), azobisisobutylnitrile, and cumene peroxide.

[0052] In some embodiments, the pressure-sensitive adhesive composition further includes: 0.01 to 3 parts of an auxiliary agent and 0.01 to 1 part of an antistatic agent. The auxiliary agent includes but is not limited to a silane coupling agent, an antioxidant, a plasticizer, etc., and the auxiliary agent is used to make the adhesive liquid level, increase UV resistance, antioxidant and other functions. The antistatic agent includes but is not limited to lithium bis(trifluoromethanesulfonyl)imide, tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide salt, etc., and the antistatic agent is used to reduce the impedance of the pressure-sensitive adhesive and reduce the static electricity effect when the release film is torn off.

[0053] In one embodiment, the pressure-sensitive adhesive composition includes, by weight: 100 parts of modified acrylate, 0.01 to 3 parts of curing agent, 0.01 to 3 parts of first initiator, 10 to 40 parts of first solvent, 0.01 to 3 parts of auxiliary agent, and 0.01 to 1 part of antistatic agent;

[0054] The modified acrylate comprises: 20 to 40 parts of butyl acrylate, 20 to 40 parts of isooctyl acrylate, 10 to 30 parts of methyl methacrylate, 10 to 20 parts of methacrylic epoxy resin, 1 to 15 parts of MQ silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent.

[0055] Wherein, the first solvent and the second solvent may be ethyl acetate, and the first initiator and the second initiator may be dibenzoyl peroxide.

[0056] The present application also provides a method for preparing a pressure-sensitive adhesive, the method for preparing the pressure-sensitive adhesive comprising:

[0057] S1. Mix 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent by weight to obtain a modified acrylate;

[0058] S2, mixing 100 parts of the modified acrylate, 0.01 to 3 parts of a curing agent, 0.01 to 3 parts of a first initiator, and 10 to 40 parts of a first solvent by weight to obtain an adhesive solution, and drying the adhesive solution to form a pressure-sensitive adhesive;

[0059] The silicone resin is composed of a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 composition, wherein R represents hydrogen, an alkyl group, an alkenyl group or an aromatic group.

[0060] Furthermore, the drying process in step S2 includes: coating the adhesive solution on a release film, and placing the film in a drying oven to dry the film to form the pressure-sensitive adhesive.

[0061] In some embodiments, the glue solution in step S2 further includes: 0.01 to 3 parts of auxiliary agent and 0.01 to 1 part of antistatic agent.

[0062] The pressure-sensitive adhesive of the present application can be used to bond a polarizer to a display panel, so as to improve the problems of polarizer peeling, bubbles, etc. caused by poor weather resistance of the existing pressure-sensitive adhesive between the polarizer and the display panel in outdoor environments.

[0063] The pressure-sensitive adhesive composition and the pressure-sensitive adhesive of the present application are further described below through specific experiments.

[0064] In Examples 1 to 4 of the present application, pressure-sensitive adhesives were prepared using pressure-sensitive adhesive compositions of different proportions, and the prepared pressure-sensitive adhesives were bonded to polarizers for weather resistance tests. The difference between Examples 1 to 4 is that silicone resin is not added to Example 1, and different amounts of MQ silicone resin are added to Examples 2, 3 and 4, respectively, and the other components in Examples 1 to 4 are the same.

[0065] 1. Preparation of pressure-sensitive adhesive

[0066] Example 1

[0067] S1. Mix 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 15 parts of methacrylic acid epoxy resin, 0.5 parts of dibenzoyl peroxide, and 20 parts of ethyl acetate by weight to obtain modified acrylate.

[0068] S2, mixing 100 parts of the modified acrylate, 25 parts of ethyl acetate, 0.5 parts of a curing agent, 0.05 parts of a first initiator, 0.05 parts of an auxiliary agent, and 0.02 parts of an antistatic agent by weight to obtain a glue solution;

[0069] S3, coating the adhesive solution on a 38 μm thick release film, and drying it in a drying oven at a temperature of 40 to 120° C. to form a pressure-sensitive adhesive 1.

[0070] Example 2

[0071] S1. Mix 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 15 parts of methacrylic acid epoxy resin, 5 parts of MQ silicone resin, 0.5 parts of dibenzoyl peroxide, and 20 parts of ethyl acetate by weight to obtain modified acrylate.

[0072] S2, mixing 100 parts of the modified acrylate, 25 parts of ethyl acetate, 0.5 parts of a curing agent, 0.05 parts of a first initiator, 0.05 parts of an auxiliary agent, and 0.02 parts of an antistatic agent by weight to obtain a glue solution;

[0073] S3, coating the adhesive solution on a 38 μm thick release film, and drying it in a drying oven at a temperature of 40 to 120° C. to form a pressure-sensitive adhesive 2.

[0074] Example 3

[0075] S1. Mix 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 15 parts of methacrylic acid epoxy resin, 10 parts of MQ silicone resin, 0.5 parts of dibenzoyl peroxide, and 20 parts of ethyl acetate by weight to obtain modified acrylate.

[0076] S2, mixing 100 parts of the modified acrylate, 25 parts of ethyl acetate, 0.5 parts of a curing agent, 0.05 parts of a first initiator, 0.05 parts of an auxiliary agent, and 0.02 parts of an antistatic agent by weight to obtain a glue solution;

[0077] S3, coating the adhesive solution on a 38 μm thick release film, and drying it in a drying oven at a temperature of 40 to 120° C. to form a pressure-sensitive adhesive 3.

[0078] Example 4

[0079] S1. Mix 25 parts of butyl acrylate, 25 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 15 parts of methacrylic acid epoxy resin, 15 parts of MQ silicone resin, 0.5 parts of dibenzoyl peroxide, and 20 parts of ethyl acetate by weight to obtain modified acrylate.

[0080] S2, mixing 100 parts of the modified acrylate, 25 parts of ethyl acetate, 0.5 parts of a curing agent, 0.05 parts of a first initiator, 0.05 parts of an auxiliary agent, and 0.02 parts of an antistatic agent by weight to obtain a glue solution;

[0081] S3, coating the adhesive solution on a 38 μm thick release film, and drying it in a drying oven at a temperature of 40 to 120° C. to form a pressure-sensitive adhesive 4.

[0082] 2. Weather resistance test

[0083] Weather resistance test: The pressure-sensitive adhesives 1 to 4 prepared in Examples 1 to 4 were respectively attached to the polarizers and left to mature for 7 days. Polarizer samples 1 to 4 of 100*100 mm were taken respectively, wherein polarizer sample 1 includes polarizer and pressure-sensitive adhesive 1, polarizer sample 2 includes polarizer and pressure-sensitive adhesive 2, polarizer sample 3 includes polarizer and pressure-sensitive adhesive 3, and polarizer sample 4 includes polarizer and pressure-sensitive adhesive 4. Polarizer samples 1 to 4 were respectively attached to A4 glass and subjected to 100°C high temperature 1000H aging test. The test results are shown in Table 1.

[0084] Table 1

[0085]

[0086] Among them, NG in Table 1 means that bubbles and peeling occur, and the high temperature resistance is poor; OK means that bubbles and peeling do not occur, and the high temperature resistance is good.

[0087] As can be seen from the data in Table 1, the pressure-sensitive adhesive composition of Example 1 uses ordinary acrylate and does not contain the silicone resin of the present application. After the aging test, sample 1 has bubbles and peeling phenomenon, which is due to the poor high temperature resistance of the conventional acrylate pressure-sensitive adhesive. However, MQ silicone resin is added to Examples 2 to 4, and no bubbles and peeling phenomenon occurs in samples 2 to 4, proving that the high temperature resistance of the acrylate pressure-sensitive adhesive modified by the silicone resin is effectively improved.

[0088] In Examples 2 to 4, due to the copolymerization reaction between MQ silicone resin and acrylate monomer, the MQ silicone resin is bonded to the acrylate structure to form a modified acrylate. The modified acrylate has the special structure of MQ silicone resin and more Si-O bonds, which improves the stability of the modified acrylate. Therefore, the high temperature resistance and weather resistance of the pressure-sensitive adhesive of the present application are significantly improved.

[0089] The present application also provides a display device 100, please refer to Figure 1The display device 100 includes a display panel 130, a polarizer 110, and a pressure-sensitive adhesive layer 120. The polarizer 110 is located on at least one side of the display panel 130; the pressure-sensitive adhesive layer 120 is located between the polarizer 110 and the display panel 130, and the pressure-sensitive adhesive layer 120 is formed of the pressure-sensitive adhesive composition described above.

[0090] Among them, the display panel 130 can be a liquid crystal display panel, including a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer located between the first substrate and the second substrate. The first substrate can be an array substrate, and the second substrate can be a color film substrate, but is not limited thereto.

[0091] The polarizer 110 includes a polarizing layer 111 and a first protective layer 112 and a second protective layer 113 located on opposite sides of the polarizing layer 111, wherein the first protective layer 112 is located on a side close to the display panel 130, and the pressure-sensitive adhesive layer 120 is located between the first protective layer 112 and the display panel 130. The material of the polarizing layer 111 may be polyvinyl alcohol (PVA); the material of the first protective layer 112 and the second protective layer 113 may be triacetate film (TAC), etc., but is not limited thereto.

[0092] The pressure-sensitive adhesive layer 120 is located between the polarizer 110 and the display panel 130. The pressure-sensitive adhesive layer 120 is formed by curing the pressure-sensitive adhesive composition described in the above embodiment. Since the pressure-sensitive adhesive layer 120 is formed by the pressure-sensitive adhesive composition of the present application, the acrylate in the pressure-sensitive adhesive composition is modified by the silicone resin, so that the weather resistance of the pressure-sensitive adhesive is significantly improved, and the peeling and bubble problems between the pressure-sensitive adhesive layer 120 and the polarizer 110 and the display panel 130 are effectively improved. The thickness of the pressure-sensitive adhesive layer 120 ranges from 10 μm to 40 μm.

[0093] In some embodiments, please refer to Figure 2 The display device 100 includes a display panel 130, a first polarizer 101, a second polarizer 102, a first pressure-sensitive adhesive layer 121, and a second pressure-sensitive adhesive layer 122. The first polarizer 101 is located at the light-emitting side of the display panel 130, the second polarizer 102 is located at a side of the display panel 130 away from the first polarizer 101, the first pressure-sensitive adhesive layer 121 is located between the first polarizer 101 and the display panel 130, and the second pressure-sensitive adhesive layer 122 is located between the second polarizer 102 and the display panel 130.

[0094] Furthermore, the display device 100 further includes a backlight module 140 , and the backlight module 140 is located on a side of the second polarizer 102 away from the display panel 130 .

[0095] In summary, the present application provides a pressure-sensitive adhesive composition, a method for preparing a pressure-sensitive adhesive, and a display device. The pressure-sensitive adhesive composition of the present application comprises a modified acrylate, which is formed by polymerization of acrylate and silicone resin, wherein the silicone resin comprises a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 The polysiloxane resin used in the present application has a large number of Si-O bonds and Si-O-Si bonds in its structure, and the Si-O bond energy is high, so that the silicone resin of the present application has higher stability, and thus has better high temperature resistance and UV resistance. The present application uses a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 The silicone resin and acrylate undergo a polymerization reaction, and the modified acrylate obtained has excellent high temperature resistance and UV resistance. Therefore, the pressure-sensitive adhesive formed by the pressure-sensitive adhesive composition of the present application has good weather resistance, thereby being able to effectively improve the peeling, bubble and other problems of the existing polarizer caused by the poor weather resistance of the pressure-sensitive adhesive.

[0096] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0097] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0099] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A pressure-sensitive adhesive composition, characterized in that: The pressure-sensitive adhesive composition comprises: modified acrylate, curing agent, first initiator and first solvent; Wherein, the modified acrylate comprises acrylate, silicone resin, a second initiator and a second solvent; The silicone resin includes a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 , wherein R is selected from hydrogen, an alkyl group, an alkenyl group or an aromatic group, and multiple Rs in the silicone resin are selected from the same group, or multiple Rs are independently selected from different groups.

2. The pressure-sensitive adhesive composition according to claim 1, characterized in that: The R is selected from hydrogen, methyl, ethyl, propyl, vinyl or phenyl.

3. The pressure-sensitive adhesive composition according to claim 1, characterized in that: The pressure-sensitive adhesive composition comprises, by weight: 100 parts of modified acrylate, 0.01 to 3 parts of curing agent, 0.01 to 3 parts of first initiator, 10 to 40 parts of first solvent; The modified acrylate comprises: 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent.

4. The pressure-sensitive adhesive composition according to claim 3, characterized in that: The acrylic ester includes at least one of butyl acrylate, isooctyl acrylate, methyl methacrylate, and methacrylic acid epoxy resin.

5. The pressure-sensitive adhesive composition according to claim 4, characterized in that: The acrylic ester comprises, by weight: 20 to 40 parts of butyl acrylate, 20 to 40 parts of isooctyl acrylate, 10 to 30 parts of methyl methacrylate and 10 to 20 parts of methacrylic epoxy resin.

6. The pressure-sensitive adhesive composition according to claim 1, characterized in that: The curing agent is selected from at least one of ethylene glycol diallyl ether, 1,6-hexanediol diacrylate, trimethylolpropane trimethacrylate and aluminum acetylacetonate; The first initiator and the second initiator are independently selected from at least one of dibenzoyl peroxide, azobisisobutylnitrile and cumene peroxide.

7. The pressure-sensitive adhesive composition according to claim 1, characterized in that: The pressure-sensitive adhesive composition further comprises, by weight: 0.01 to 3 parts of auxiliary agent and 0.01 to 1 part of antistatic agent.

8. The pressure-sensitive adhesive composition according to claim 7, characterized in that: The auxiliary agent is selected from at least one of a silane coupling agent, an antioxidant and a plasticizer; And / or, the antistatic agent is selected from at least one of lithium bis(trifluoromethanesulfonyl)imide and tri-n-butylmethylammonium bis(trifluoromethanesulfonyl)imide salt.

9. A method for preparing a pressure-sensitive adhesive, characterized in that: include: Mix 60 to 100 parts of acrylate, 1 to 15 parts of silicone resin, 0.1 to 5 parts of a second initiator, and 10 to 50 parts of a second solvent by weight to obtain a modified acrylate; Mixing 100 parts of the modified acrylate, 0.01 to 3 parts of a curing agent, 0.01 to 3 parts of a first initiator, and 10 to 40 parts of a first solvent by weight to obtain an adhesive solution, and drying the adhesive solution to form a pressure-sensitive adhesive; The silicone resin comprises a tetrafunctional chain SiO2 and a monofunctional chain R3SiO 1 / 2 , wherein R is selected from hydrogen, an alkyl group, an alkenyl group or an aromatic group, and multiple Rs in the silicone resin are selected from the same group, or multiple Rs are independently selected from different groups.

10. A display device, characterized in that: include: Display panel; a polarizer, located on at least one side of the display panel; as well as A pressure-sensitive adhesive layer is located between the polarizer and the display panel, and the pressure-sensitive adhesive layer is formed by the pressure-sensitive adhesive composition according to any one of claims 1 to 8.

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