Optical pressure-sensitive adhesive for polycarbonate diffusion plate and preparation method thereof

Abstract

The application provides a kind of optical pressure-sensitive adhesive for polycarbonate diffusion plate and a preparation method thereof, and belongs to the technical field of synthesis of acrylate pressure-sensitive adhesive.The application uses butyl acrylate, isooctyl acrylate and methyl methacrylate as main monomers, uses acrylic acid and hydroxyl-containing acrylate as functional monomers, and adds appropriate amount of internal crosslinking monomer, photoinitiator and active amine monomer, to prepare high-performance solvent-free, environmentally friendly optical acrylate pressure-sensitive adhesive under the irradiation of ultraviolet light.The pressure-sensitive adhesive is mainly used for polycarbonate diffusion plate which is not resistant to solvent and needs direct coating process, to give the product better optical transmittance and visual effect.

Description

Technical Field

[0001] This invention relates to the field of acrylic pressure-sensitive adhesive synthesis technology, and more particularly to an optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method. Background Technology

[0002] To better align with the energy-saving and environmentally friendly concepts and visual innovations advocated by social development, the pace of product updates and iterations in the high-definition, high-color-rendering OLED field is accelerating, thus placing higher demands on the materials used in OLEDs. Traditional polymer materials such as polyethylene terephthalate (PET) and polystyrene (PS) can no longer meet the performance requirements of current OLED products. The emergence of polycarbonate (PC) diffuser plates has provided a new approach for OLED development. However, with product upgrades, the demand for functionalized PC diffuser plates is increasing, requiring the assembly of diffuser plates with different functions to give composite materials more functionality. Using pressure-sensitive adhesives to bond PC diffuser plates with different functions is a good solution; however, existing pressure-sensitive adhesives suffer from problems such as low light transmittance, insufficient bonding strength, and numerous air bubbles during use. Currently, domestically produced pressure-sensitive adhesives cannot meet the requirements for PC diffuser films. Therefore, developing a solvent-free, environmentally friendly, and fully domestically produced optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method is a technical problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide an optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method, so as to solve the above-mentioned technical problems.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] This invention provides an optical pressure-sensitive adhesive for polycarbonate diffuser plates, prepared from raw materials comprising the following parts by weight:

[0006]

[0007]

[0008] Furthermore, the hydroxyl-containing functional monomer comprises hydroxyethyl acrylate and / or hydroxyethyl methacrylate.

[0009] Furthermore, the internal crosslinking monomer comprises 1,6-hexanediol diacrylate and / or ethoxylated trimethylolpropane triacrylate.

[0010] Furthermore, the photoinitiator comprises one or more of 1-hydroxycyclohexylbenzophenone, 2-hydroxy-2-methyl-1-phenylpropanone, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

[0011] Furthermore, the active amine monomer comprises one or more of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

[0012] This invention also provides a method for preparing an optical pressure-sensitive adhesive for a polycarbonate diffuser plate, comprising the following steps:

[0013] 1) Butyl acrylate, isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyl-containing functional monomers, internal crosslinking monomers, some photoinitiators and active amine monomers are mixed under nitrogen protection to obtain a mixture;

[0014] 2) The mixture is subjected to a polymerization reaction under ultraviolet light to obtain a prepolymer;

[0015] 3) Mix the prepolymer and the remaining photoinitiator, and crosslink and cure under light to obtain the optical pressure-sensitive adhesive for polycarbonate diffuser plates.

[0016] Furthermore, the photoinitiator accounts for 40-50% of the total photoinitiator.

[0017] Furthermore, the conditions for ultraviolet irradiation are: irradiation wavelength of 245–380 nm, irradiation distance of 1–10 cm, and irradiation time of 3–8 min.

[0018] Furthermore, in step 3), the dominant wavelength of the illumination is 365 nm, and the intensity of the illumination is 20–30 mW / cm². 2 The duration of illumination is 20–30 seconds.

[0019] The beneficial effects of this invention are:

[0020] The optical pressure-sensitive adhesive of this invention has a simple synthesis process, is a solvent-free green and environmentally friendly adhesive, has a light transmittance of over 90%, is easy to use, has excellent initial tack, peel strength and holding power, and also has good weather resistance and high and low temperature resistance. Detailed Implementation

[0021] This invention provides an optical pressure-sensitive adhesive for polycarbonate diffuser plates, prepared from raw materials comprising the following parts by weight:

[0022]

[0023] In this invention, the content of butyl acrylate is preferably 38 to 52 parts by weight, more preferably 40 to 50 parts, and even more preferably 42 to 48 parts.

[0024] In this invention, the content of isooctyl acrylate is preferably 25 to 35 parts by weight, more preferably 28 to 32 parts, and even more preferably 30 parts.

[0025] In this invention, the content of methyl methacrylate is preferably 8 to 12 parts by mass, more preferably 9 to 11 parts, and even more preferably 10 parts by mass.

[0026] In this invention, the content of acrylic acid is preferably 3 to 5 parts by weight, and more preferably 4 parts by weight.

[0027] In this invention, the content of the hydroxyl-containing functional monomer is preferably 2 parts by weight.

[0028] In this invention, the content of the internal crosslinking monomer is preferably 0.2 to 0.8 parts by mass, more preferably 0.4 to 0.6 parts, and even more preferably 0.5 parts.

[0029] In this invention, the content of the photoinitiator is preferably 0.5 to 2.0 parts by weight, more preferably 0.8 to 1.8 parts, and even more preferably 1.0 to 1.5 parts.

[0030] In this invention, the content of the active amine monomer is preferably 0.5 to 2.2 parts by mass, more preferably 1.0 to 2.0 parts, and even more preferably 1.2 to 1.8 parts.

[0031] In this invention, the hydroxyl-containing functional monomer comprises hydroxyethyl acrylate and / or hydroxyethyl methacrylate, preferably hydroxyethyl acrylate.

[0032] In this invention, the internal crosslinking monomer comprises 1,6-hexanediol diacrylate and / or ethoxytrimethylolpropane triacrylate, preferably 1,6-hexanediol diacrylate.

[0033] In this invention, the photoinitiator comprises one or more of 1-hydroxycyclohexylbenzophenone, 2-hydroxy-2-methyl-1-phenylpropanone, and 2,4,6-trimethylbenzoyldiphenylphosphine oxide, preferably 2-hydroxy-2-methyl-1-phenylpropanone and 2,4,6-trimethylbenzoyldiphenylphosphine oxide in a mass ratio of 1:1.

[0034] In this invention, the active amine monomer comprises one or more of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone, preferably 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone.

[0035] This invention also provides a method for preparing an optical pressure-sensitive adhesive for a polycarbonate diffuser plate, comprising the following steps:

[0036] 1) Butyl acrylate, isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyl-containing functional monomers, internal crosslinking monomers, some photoinitiators and active amine monomers are mixed under nitrogen protection to obtain a mixture;

[0037] 2) The mixture is subjected to a polymerization reaction under ultraviolet light to obtain a prepolymer;

[0038] 3) Mix the prepolymer and the remaining photoinitiator, and crosslink and cure under light to obtain the optical pressure-sensitive adhesive for polycarbonate diffuser plates.

[0039] In this invention, the photoinitiator accounts for 40-50% of the total photoinitiator, preferably 50%.

[0040] In this invention, the conditions for ultraviolet irradiation are: irradiation wavelength of 245-380nm, irradiation distance of 1-10cm, and irradiation time of 3-8min.

[0041] In this invention, in step 3), the dominant wavelength of the illumination is 365 nm, and the intensity of the illumination is 20–30 mW / cm². 2 The preferred value is 20mW / cm 2 The illumination time is 20-30 seconds, preferably 25 seconds.

[0042] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0043] Example 1

[0044] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0045] (1) Place 55 parts of butyl acrylate, 20 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl acrylate, 1 part of 1,6-adipic acid dipropionate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection, and stir rapidly for 15 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0046] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 245nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 5min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0047] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 20 seconds to allow the colloid to cross-link and solidify again.

[0048] Example 2

[0049] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0050] (1) Place 54 parts of butyl acrylate, 21 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of 1,6-adipic acid dipropionate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl) into a flask under nitrogen protection and stir rapidly for 10 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 160 r / min.

[0051] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 380nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 9cm. The irradiation time is controlled at 7min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0052] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 25 seconds to allow the colloid to cross-link and solidify again.

[0053] Example 3

[0054] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0055] (1) Place 53 parts of butyl acrylate, 23 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of trimethylolpropane triacrylate, 0.8 parts of 2-hydroxy-2-methyl-1-phenylpropanone and 1.2 parts of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone into a flask under nitrogen protection, and stir rapidly for 10 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 160 r / min.

[0056] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 365nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 6min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0057] (3) After the prepolymer is prepared, add 1 part of 2-hydroxy-2-methyl-1-phenylpropanone, stir well, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2Irradiate for 25 seconds to allow the colloid to cross-link and solidify again.

[0058] Example 4

[0059] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0060] (1) Place 53 parts of butyl acrylate, 23 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of trimethylolpropane triacrylate ethoxylate, 0.8 parts of 1-hydroxycyclohexyl benzophenone and 1.2 parts of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection, and stir rapidly for 10 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 160 r / min.

[0061] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 280nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 6min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0062] (3) After the prepolymer is prepared, add 1 part of 1-hydroxycyclohexylbenzophenone, stir well, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 25 seconds to allow the colloid to cross-link and solidify again.

[0063] Example 5

[0064] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0065] (1) Place 55 parts of butyl acrylate, 20 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of trimethylolpropane triacrylate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection, and stir rapidly for 15 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0066] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 320 nm. During this process, the stirring speed is controlled at 180 r / min, and the distance between the light source and the reaction vessel is controlled at 8 cm. The irradiation time is controlled at 5 min. When the viscosity of the system reaches 2500 cps (25℃), the prepolymer preparation is completed.

[0067] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 20 seconds to allow the colloid to cross-link and solidify again.

[0068] Example 6

[0069] An optical pressure-sensitive adhesive for polycarbonate diffuser plates and its preparation method thereof, comprising the following steps:

[0070] (1) Place 50 parts of butyl acrylate, 25 parts of isooctyl acrylate, 13 parts of methyl methacrylate, 4 parts of acrylic acid, 4 parts of 2-hydroxyethyl acrylate, 1 part of 1,6-adipic acid dipropionate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection, and stir rapidly for 15 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0071] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 245nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 7cm. The irradiation time is controlled at 8min. When the viscosity of the system reaches 3000cps (25℃), the prepolymer preparation is completed.

[0072] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2Irradiate for 25 seconds to allow the colloid to cross-link and solidify again.

[0073] Comparative Example 1

[0074] (1) Place 55 parts of butyl acrylate, 21 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection and stir rapidly for 15 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0075] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 245nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 5min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0076] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 20 seconds to allow the colloid to cross-link and solidify again.

[0077] Comparative Example 2

[0078] (1) Place 55 parts of butyl acrylate, 20 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 4 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of trimethylolpropane triacrylate, and 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide into a flask under nitrogen protection. Stir rapidly for 15 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0079] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 245nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 5min. When the viscosity of the system reaches 2500cps (25℃), the prepolymer preparation is completed.

[0080] (3) After the prepolymer is prepared, add 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide, stir evenly, and store in a light-proof container for later use. When using, evenly coat the prepolymer onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm². 2 Irradiate for 20 seconds to allow the colloid to cross-link and solidify again.

[0081] Comparative Example 3

[0082] (1) Place 55 parts of butyl acrylate, 20 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 3 parts of acrylic acid, 3 parts of 2-hydroxyethyl methacrylate, 1 part of trimethylolpropane triacrylate, 1 part of 2,4,6-trimethylbenzoyl diphenylphosphine oxide and 1 part of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone into a flask under nitrogen protection, and stir rapidly for 30 minutes under nitrogen protection to ensure that the raw materials are fully mixed. The stirring speed is 180 r / min.

[0083] (2) After the raw materials are mixed evenly, a UVLED device is used to irradiate the transparent reaction vessel, so that the monomer raw materials in the vessel undergo polymerization under ultraviolet light with a wavelength of 245nm. During this process, the stirring speed is controlled at 180r / min, and the distance between the light source and the reaction vessel is controlled at 8cm. The irradiation time is controlled at 2min. When the viscosity of the system reaches 1500cps (25℃), the prepolymer preparation is completed.

[0084] (3) After the prepolymer is prepared, stir it evenly and store it in a light-proof container for later use. When using, coat the prepolymer evenly onto a polycarbonate diffusion plate (1500 μm thick), controlling the dry adhesive thickness to 25 μm. Then, bond it to a polycarbonate diffusion film (100 μm thick) and heat it with a high-pressure mercury lamp at a main wavelength of 365 nm and an intensity of 20 mW / cm. 2 Irradiate for 20 seconds to allow the colloid to cross-link and solidify again.

[0085] The optical pressure-sensitive adhesives obtained in the examples and comparative examples were subjected to performance tests, and the results are shown in Table 1 below.

[0086] Table 1 Performance Test Results

[0087]

[0088] As can be seen from the above embodiments, the present invention provides an optical pressure-sensitive adhesive for polycarbonate diffusers and its preparation method. The results show that the preparation process of the optical pressure-sensitive adhesive of the present invention is simple and easy to implement, complies with green and environmentally friendly policy requirements, and exhibits excellent light transmittance and weather resistance when applied to polycarbonate diffusers.

[0089] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An optical pressure-sensitive adhesive for polycarbonate-based diffusion plates, characterized by, Prepared from raw materials comprising the following mass fractions: butyl acrylate 35~55 parts; isooctyl acrylate 20~40 parts; methyl methacrylate 5~15 parts; acrylic acid 2~6 parts; hydroxyl-containing functional monomer 1~3 parts; internal crosslinking monomer 0.1~1 part; photoinitiator 0.1~2.2 parts; active amine monomer 0.1~2.5 parts; the active amine monomer comprises one or more of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl) butanone, 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone and 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone; the internal crosslinking monomer comprises 1,6-hexanediol diacrylate and / or ethoxylated trimethylolpropane triacrylate; the photoinitiator comprises one or more of 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropanone and 2,4,6-trimethylbenzoyl diphenyl phosphine oxide; The preparation method of the optical pressure-sensitive adhesive for polycarbonate diffusion plates comprises the following steps: 1) butyl acrylate, isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyl-containing functional monomer, internal crosslinking monomer, part of photoinitiator and active amine monomer are mixed under the protection of nitrogen to obtain a mixture; 2) the mixture is subjected to a polymerization reaction under the condition of ultraviolet light to obtain a prepolymer; 3) the prepolymer and the remaining photoinitiator are mixed and crosslinked and cured under light to obtain the optical pressure-sensitive adhesive for polycarbonate diffusion plates; the part of photoinitiator accounts for 40~50% of the total amount of photoinitiator.

2. The polycarbonate-based optical pressure-sensitive adhesive for a diffusion plate according to claim 1, characterized by, The hydroxyl-containing functional monomer comprises hydroxyethyl acrylate and / or hydroxyethyl methacrylate.

3. The method of producing the optical pressure-sensitive adhesive for polycarbonate-based diffusion sheets according to any one of claims 1 to 2, characterized by, comprises the following steps: 1) butyl acrylate, isooctyl acrylate, methyl methacrylate, acrylic acid, hydroxyl-containing functional monomer, internal crosslinking monomer, part of photoinitiator and active amine monomer are mixed under the protection of nitrogen to obtain a mixture; 2) the mixture is subjected to a polymerization reaction under the condition of ultraviolet light to obtain a prepolymer; 3) the prepolymer and the remaining photoinitiator are mixed and crosslinked and cured under light to obtain the optical pressure-sensitive adhesive for polycarbonate diffusion plates; the part of photoinitiator accounts for 40~50% of the total amount of photoinitiator.

4. The production method according to claim 3, characterized by, The condition of ultraviolet light is that the light wavelength is 245~380 nm, the light distance is 1~10 cm and the light time is 3~8 min.

5. The preparation method according to claim 4, characterized in that, In the step 3), the main wavelength of the light is 365 nm, the intensity of the light is 20-30 mW / cm 2 , and the time of the light is 20-30 s.

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