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CN-122011979-A - OCA (optical clear adhesive) of rubber modified acrylate system and preparation method thereof

CN122011979ACN 122011979 ACN122011979 ACN 122011979ACN-122011979-A

Abstract

The invention belongs to the field of material synthesis, and in particular relates to an OCA of a rubber modified acrylic ester system and a preparation method thereof, wherein the OCA comprises matrix resin, a rubber modifier, functional filler and an auxiliary agent; the matrix resin is selected from one or more of isooctyl acrylate, methyl methacrylate and isobornyl acrylate, the rubber modifier is selected from one or more of natural rubber, styrene-butadiene rubber, isoprene rubber and nitrile rubber, the functional filler is selected from nano silica aerogel, and the auxiliary agent is selected from one or more of photoinitiator, silane coupling agent, antioxidant and anti-ultraviolet ageing agent. Solves the problem of balancing the OCA with low dielectric constant, high light transmittance, strong adhesion and flexibility.

Inventors

  • WANG TIANFU
  • CAI JIAN
  • ZHANG QING

Assignees

  • 睿合科技有限公司

Dates

Publication Date
20260512
Application Date
20260128

Claims (10)

  1. 1. The OCA of the rubber modified acrylic ester system is characterized by comprising a matrix resin, a rubber modifier, a functional filler and an auxiliary agent; the matrix resin is selected from one or more of isooctyl acrylate, methyl methacrylate and isobornyl acrylate; the rubber modifier is one or more of natural rubber, styrene-butadiene rubber, isoprene rubber and nitrile rubber; The functional filler is selected from nano silica aerogel; the auxiliary agent is selected from one or more of photoinitiator, silane coupling agent, antioxidant and anti-ultraviolet aging agent; wherein the addition amount of the matrix resin is 83% -90%, the addition amount of the rubber modifier is 5% -15%, the addition amount of the functional filler is 0.5% -1%, and the addition amount of the auxiliary agent is 1% -2%.
  2. 2. The OCA of claim 1, wherein the matrix resin is selected from the group consisting of isooctyl acrylate and methyl methacrylate, or the matrix resin is selected from the group consisting of isooctyl acrylate, methyl methacrylate and isobornyl acrylate; Wherein the addition amount of the matrix resin is 85% -90%.
  3. 3. The OCA of claim 1 or 2, wherein the rubber modifier is selected from the group consisting of nitrile rubber containing 22% acrylonitrile; wherein the addition amount of the rubber modifier is 8% -12%.
  4. 4. The OCA according to any one of claims 1 to 3, wherein the nano silica aerogel has a particle size of 50-100nm and a specific surface area of >600m 2 /g; The addition amount of the nano silicon dioxide aerogel is 0.7% -0.9%.
  5. 5. The OCA as claimed in any of claims 1 to 4, wherein the auxiliary agent is selected from TPO photoinitiator and KH-570 silane coupling agent, and the auxiliary agent is added in an amount of 1.2% -1.6%.
  6. 6. The OCA of any of claims 1-5, wherein the OCA comprises methyl methacrylate, isooctyl acrylate, nitrile rubber, nanosilica aerogel, TPO photoinitiator, and KH-570 silane coupling agent, or The OCA comprises methyl methacrylate, isooctyl acrylate, isobornyl acrylate, nitrile rubber, nano silica aerogel, TPO photoinitiator and KH-570 silane coupling agent.
  7. 7. The OCA of any of claims 1-6, wherein the OCA comprises 100g methyl methacrylate, 10g isooctyl acrylate, 10g nitrile rubber, 1g nano silica aerogel, 1g TPO photoinitiator, and 0.8g KH-570 silane coupling agent; The OCA comprises 100g of methyl methacrylate, 10g of isooctyl acrylate, 15g of nitrile rubber, 1g of nano silicon dioxide aerogel, 1g of TPO photoinitiator and 0.8g of KH-570 silane coupling agent, or The OCA comprises 40g of methyl methacrylate, 10g of isooctyl acrylate, 60g of isobornyl acrylate, 10g of nitrile rubber, 1g of nano silica aerogel, 1g of TPO photoinitiator and 0.8g of KH-570 silane coupling agent.
  8. 8. A process for the preparation of OCA of a rubber modified acrylate system according to any one of claims 1 to 7 comprising: s1, stirring matrix resin, a rubber modifier and an auxiliary agent for 6 hours at a constant temperature of 50-60 ℃ in a nitrogen atmosphere to obtain an OCA prepolymer; s2, dispersing functional filler in absolute ethyl alcohol, and processing for 30 minutes by an ultrasonic instrument to obtain functional filler dispersion; S3, uniformly mixing the OCA prepolymer with the functional filler dispersion to obtain mixed slurry of OCA and functional filler; s4, removing dissolved gas and solvent in the mixed slurry to obtain OCA mixed slurry; s5, uniformly coating OCA mixed slurry on a PET release film, and then irradiating through an LED light source; and S6, curing the wet film on the PET release film for 2 hours at 120 ℃ to obtain the OCA film material with the thickness of 50-200 mu m.
  9. 9. The method according to claim 8, wherein in S1, under nitrogen atmosphere, a matrix resin, a rubber modifier and an auxiliary agent are placed in a three-neck flask with mechanical stirring, and are stirred in a 55 ℃ water bath for 6 hours to obtain a transparent viscous OCA prepolymer, wherein the addition amount of the matrix resin is 86-90%, the addition amount of the rubber modifier is 8-12%, and the addition amount of the auxiliary agent is 1.2-1.6%; In S2, adding 1g of nano silica aerogel into 50mL of ethanol, and carrying out ultrasonic treatment for 30 minutes, wherein the functional filler is selected from nano silica aerogel, the particle size of the nano silica aerogel is 50-100nm, the specific surface area is more than 600m 2 /g, and the addition amount is 0.7-0.9%; in S4, injecting the mixture into a vacuum deaeration tank, deaerating for 30 minutes under-0.095 MPa until no bubbles are separated out; In S5, uniformly coating the OCA mixed slurry on the PET release film by a slit coater, wherein the wet film thickness is controlled to be 60-250 mu m, the wavelength of an LED light source is 365nm, the intensity is 8mW/cm 2 , the irradiation time is 150-300 seconds, and the preferable irradiation time is 180 seconds.
  10. 10. The method according to claim 8 or 9, wherein in S5, the OCA mixed slurry is applied between 50 μm and 75 μm release films using a coater, and the wet film thickness is set to 150. Mu.m.

Description

OCA (optical clear adhesive) of rubber modified acrylate system and preparation method thereof Technical Field The invention relates to the technical field of material synthesis, in particular to an OCA of a rubber modified acrylic ester system and a preparation method thereof. Background At present, commercial OCA mainly uses acrylic ester or polyurethane acrylic ester as a matrix, and although basic optical and bonding requirements can be met, polar groups (such as ester groups, hydroxyl groups and the like) in a molecular chain of the commercial OCA are easy to generate oriented polarization under a high-frequency electric field, so that the dielectric constant is higher (generally 3.5-4.2), and further signal attenuation and crosstalk are caused. To reduce the dielectric properties, the prior art has mostly employed the addition of inorganic nanofillers (such as titanium dioxide, boron nitride) or the incorporation of fluorinated polymers. For example, CN112225816a discloses a fluorinated urethane acrylate OCA, the dielectric constant of which can be reduced to 3.2, but the hydrophobic property of fluorinated component causes the adhesiveness to the substrate to be reduced, and CN110527125A adopts nano alumina filler to improve dielectric property, but the light scattering is induced by the difference of refractive index between the filler and the matrix, and the light transmittance is reduced to below 88%. In addition, high filler contents can also exacerbate material embrittlement, affecting the bending life of the flexible device. Thus, there is a need in the industry for an innovative material solution that balances low dielectric constant, high light transmittance, strong adhesion, and flexibility. Disclosure of Invention In view of the above analysis, the present invention aims to provide an OCA of a rubber modified acrylate system and a preparation method thereof, which are used for solving the problem of balancing the OCA among low dielectric constant, high light transmittance, strong adhesion and flexibility. In one aspect, embodiments of the present invention provide an OCA for a rubber modified acrylate system, the OCA comprising a matrix resin, a rubber modifier, a functional filler, and an adjuvant; the matrix resin is selected from one or more of isooctyl acrylate, methyl methacrylate and isobornyl acrylate; the rubber modifier is one or more of natural rubber, styrene-butadiene rubber, isoprene rubber and nitrile rubber; The functional filler is selected from nano silica aerogel; the auxiliary agent is selected from one or more of photoinitiator, silane coupling agent, antioxidant and anti-ultraviolet aging agent; wherein the addition amount of the matrix resin is 83% -90%, the addition amount of the rubber modifier is 5% -15%, the addition amount of the functional filler is 0.5% -1%, and the addition amount of the auxiliary agent is 1% -2%. Further, the matrix resin is selected from isooctyl acrylate and methyl methacrylate, or the matrix resin is selected from isooctyl acrylate, methyl methacrylate and isobornyl acrylate; Wherein the addition amount of the matrix resin is 85% -90%. Further, the rubber modifier is selected from nitrile rubber, and the nitrile rubber contains 22% of acrylonitrile; wherein the addition amount of the rubber modifier is 8% -12%. Further, the particle size of the nano silicon dioxide aerogel is 50-100nm, and the specific surface area is more than 600m 2/g; The addition amount of the nano silicon dioxide aerogel is 0.7% -0.9%. Further, the auxiliary agent is selected from TPO photoinitiator and KH-570 silane coupling agent, and the addition content of the auxiliary agent is 1.2% -1.6%. Further, the OCA comprises methyl methacrylate, isooctyl acrylate, nitrile rubber, nano silica aerogel, TPO photoinitiator and KH-570 silane coupling agent, or The OCA comprises methyl methacrylate, isooctyl acrylate, isobornyl acrylate, nitrile rubber, nano silica aerogel, TPO photoinitiator and KH-570 silane coupling agent. Further, the OCA comprises 100g of methyl methacrylate, 10g of isooctyl acrylate, 10g of nitrile rubber, 1g of nano silica aerogel, 1g of TPO photoinitiator and 0.8g of KH-570 silane coupling agent; The OCA comprises 100g of methyl methacrylate, 10g of isooctyl acrylate, 15g of nitrile rubber, 1g of nano silicon dioxide aerogel, 1g of TPO photoinitiator and 0.8g of KH-570 silane coupling agent, or The OCA comprises 40g of methyl methacrylate, 10g of isooctyl acrylate, 60g of isobornyl acrylate, 10g of nitrile rubber, 1g of nano silica aerogel, 1g of TPO photoinitiator and 0.8g of KH-570 silane coupling agent. In one aspect, embodiments of the present invention provide a method for indexing OCA of a rubber modified acrylate system as described above, Comprising the following steps: s1, stirring matrix resin, a rubber modifier and an auxiliary agent for 6 hours at a constant temperature of 50-60 ℃ in a nitrogen atmosphere to obtain an OCA prepolymer; s2, disp