CN106168689A - A kind of highlighted optical film producing method of high fog - Google Patents

Abstract

A kind of highlighted optical film producing method of high fog, concretely comprises the following steps: light is spread coating and is spread evenly across base material front and forms upper Diffusion barrier layer by (1), dry, after aging, cooling semi-finished product；(2) back side that ultraviolet curing acrylic resin is spread evenly across semi-finished product forms bright enhancement film layer, gets product after solidification.Step of the present invention is simple, workable, by the Optimal improvements to light diffusion formulation for coating material, the mutual coordinated of each component, the optical film thickness prepared and even density, have diffusingsurface soft and be difficult to features such as being scratched, and light diffusion function is excellent, optics briliancy high, mist degree and light transmittance good, excellent in optical properties, can meet the requirement to high briliancy of the various sizes liquid crystal display screen.

Description

A kind of manufacturing method of high-fog and high-brightness optical film

technical field

The invention relates to the technical field of optical film manufacture, in particular to a method for manufacturing a high-fog and high-brightness optical film.

Background technique

As an important part of the information industry, the flat panel display (FPD, such as LCD, PDP, etc.) industry has developed rapidly in recent years. Flat panel displays are widely used in TVs, computer monitors, notebook computers, mobile phones, digital cameras, MP3, MP4, MP5, car DSC/DV, GPS navigators and other products. However, these flat panel displays do not emit light themselves, and the light source for the generated picture is provided by the backlight module, and the light source requires uniformity and high brightness. Regardless of the widely used LED backlight or the traditional CCFL backlight, the light emitted by it is a point light source or a line light source, not a surface light source. But through the diffusion film used in the backlight module, it can be distributed into a uniform surface light source. When light passes through the diffusion layer, optical phenomena such as refraction and reflection occur continuously in two media with different refractive indices, so as to obtain the result of optical diffusion. Existing optical diffusion films have defects such as low optical luminance, thicker materials, and easy scratches on the diffusion surface, which cannot meet the high-end needs of the optoelectronic industry.

For example, the Chinese patent application publication number CN1570675A discloses a manufacturing method of a photoelectric diffusion film. The process steps are: a. Put the transparent or translucent substrate on the coating machine; b. Put the ingredients of the diffusion film into In the coating machine; c. coating the diffusion film ingredients on the front side of the substrate to form the light-emitting surface of the diffusion film; d. placing the diffusion film on a constant temperature and humidity rack for drying; e. Repeat steps a through d to form the light incident side of the diffuser. The photoelectric diffusion film prepared by the method of the invention has defects such as low optical luminance, poor haze and light transmittance, and low overall quality of the photoelectric diffusion film. The light-diffusing particles in the coating are easy to settle, which will affect the coating uniformity of the coating and affect the product quality.

Contents of the invention

The present invention aims to solve the above-mentioned technical problems existing in the optical film of the prior art, and provides a method for manufacturing a high-fog and high-brightness optical film with simple process steps, low cost and strong operability. Excellent performance, high optical brightness, good haze and light transmittance, etc.

In order to achieve the above object, the present invention adopts the following technical solutions:

A method for manufacturing a high-fog and high-brightness optical film of the present invention, the specific steps are:

(1) Apply the light-diffusing coating evenly on the front of the substrate to form an upper diffusion film layer, dry, age, and cool to obtain a semi-finished product. The light-diffusing coating is made of the following components by weight: methyl ethyl ketone 18~20 parts, 15~17 parts of pentaerythritol acrylate, 3~5 parts of butyl acrylate, 1~3 parts of polyethylene glycol, 5~10 parts of poly(n-butyl methacrylate), 1~2 parts of dibutyltin dilaurate 1~2 parts of nano-silica, 15~17 parts of butyl acetate, 3~4 parts of aliphatic polyisocyanate, 0.2~0.5 parts of polyether modified polydimethylsiloxane, 10~ 15 parts, polystyrene 14~15 parts, light diffusing particles 3~5 parts. Aiming at the problems existing in the optical film of the prior art, the present invention improves and optimizes the formulation of the light-diffusing coating, mainly in that: pentaerythritol acrylate, butyl acrylate, polyethylene glycol, dibutyltin dilaurate and nanometer dilaurate are added. Silicon oxide, pentaerythritol acrylate is a colorless or light yellow liquid, perfectly compatible with other components, with high cross-linking density, fast curing characteristics, can improve film-forming performance, and at the same time can make the upper diffusion optical film have excellent flexibility and scratch resistance, but the addition of pentaerythritol acrylate will improve the fluidity of the entire system and affect the coating performance. Therefore, dibutyltin dilaurate is added in the present invention, and dibutyltin dilaurate can inhibit the entire system of the present invention. The fluidity of the system can solve the problems caused by adding pentaerythritol acrylate, and dibutyltin dilaurate can also improve the light stability and transparency of the upper diffusion optical film, but the addition of dibutyltin dilaurate will make The light-diffusing coating produces a large amount of air bubbles, and the present invention solves this problem by adding nano-silica. The bubble effect can reduce the bubbles in the light diffusion coating, which is beneficial to improve the quality of the diffusion optical film. In addition, nano-silica can increase the hardness of the upper diffusion film layer and improve the scratch resistance; The surface gloss of the diffusion film can improve the light transmittance and reduce light loss; polyethylene glycol can improve the stability and uniformity of the light diffusion coating, effectively prevent the coating from settling, and help improve the coating performance.

(2) Evenly coat the UV-curable acrylic resin on the back of the semi-finished product to form a light-enhancing film layer, and the finished product can be obtained after curing. A protective film can be compounded on the prepared light-enhancing film layer to play a protective role.

Preferably, in step (1), the coating thickness of the light-diffusing coating is 5-10 μm.

Preferably, in step (1), the light-diffusing particles are one or more of polymethacrylate particles, polystyrene particles, polysiloxane particles, and polyacrylic acid particles.

Preferably, the particle size of the light-diffusing particles is 0.1-1 μm.

Preferably, in step (1), the substrate is a PET film.

As a preference, in step (1), the specific step of drying is: heating up to 100-120°C, and drying for 40-60s.

Preferably, in step (1), the specific step of aging is: aging at 50-60° C. for 50-60 h.

Preferably, in step (2), the coating thickness of the ultraviolet curable acrylic resin is 15-20 μm.

Therefore, the present invention has the following beneficial effects: the present invention has simple steps and strong operability. By optimizing and improving the formulation of the light-diffusing coating, each component cooperates with each other, and the thickness and density of the prepared optical film are uniform, and the diffusion surface is soft. It is not easy to be scratched, and has excellent light diffusion function, high optical brightness, good haze and light transmittance, excellent optical performance, and can meet the requirements of various sizes of LCD screens for high brightness.

detailed description

The present invention will be further described below through specific embodiments.

Example 1

A method for manufacturing a high-fog and high-brightness optical film, the specific steps are:

(1) Apply the light-diffusing coating evenly on the front of the substrate (PET film) to form an upper diffusion film layer with a thickness of 7 μm, heat up to 110°C for 50 seconds, age at 55°C for 55 hours, and cool to obtain a semi-finished product. The light-diffusing coating is made of Made with the following components by weight: methyl ethyl ketone 19 kg, pentaerythritol acrylate 16 kg, butyl acrylate 4 kg, polyethylene glycol 2 kg, poly-n-butyl methacrylate 7 kg, dibutyltin dilaurate 1.5 kg, Nano silica 1.2 kg, butyl acetate 16 kg, aliphatic polyisocyanate 3.5 kg, polyether modified polydimethylsiloxane 0.4 kg, polymethyl propylene 12 kg, polystyrene 14.5 kg, particle size is 0.2μm light diffusing particles (polymethacrylate particles) 4 kg;

(2) Apply UV-curable acrylic resin (model ZHU-1668) evenly on the back of the semi-finished product to form a 17μm-thick gloss-increasing film layer, and the finished product is obtained after curing.

Example 2

A method for manufacturing a high-fog and high-brightness optical film, the specific steps are:

(1) Apply the light-diffusing coating evenly on the front of the substrate (PET film) to form an upper diffusion film layer with a thickness of 10 μm, heat up to 120°C for 60s, age at 60°C for 60h, and cool to obtain a semi-finished product. The light-diffusing coating is made of Made with the following components by weight: methyl ethyl ketone 20 kg, pentaerythritol acrylate 17 kg, butyl acrylate 5 kg, polyethylene glycol 3 kg, poly-n-butyl methacrylate 10 kg, dibutyltin dilaurate 2 kg, nano-silica 2 kg, butyl acetate 17 kg, aliphatic polyisocyanate 4 kg, polyether-modified polydimethylsiloxane 0.5 kg, polymethylacrylic 15 kg, polystyrene 15 kg, pellets 5 kg of light-diffusing particles (polysiloxane particles) with a diameter of 1 μm;

(2) Apply UV-curable acrylic resin (model ZHU-1668) evenly on the back of the semi-finished product to form a 20μm-thick gloss-increasing film layer, and the finished product is obtained after curing.

Example 3

A method for manufacturing a high-fog and high-brightness optical film, the specific steps are:

(1) Apply the light-diffusing coating evenly on the front of the substrate (PET film) to form an upper diffusion film layer with a thickness of 5 μm, heat up to 100°C for 40 seconds, age at 50°C for 50 hours, and cool to obtain a semi-finished product. The light-diffusing coating is made of Made from the following components by weight: methyl ethyl ketone 18kg, pentaerythritol acrylate 15kg, butyl acrylate 3kg, polyethylene glycol 1 kg, poly(n-butyl methacrylate) 5kg, dibutyltin dilaurate 1kg, nano di Silicon oxide 1kg, butyl acetate 15kg, aliphatic polyisocyanate 3kg, polyether modified polydimethylsiloxane 0.2kg, polymethylacrylic 10kg, polystyrene 14kg, light-diffusing particles with a particle size of 0.1μm ( The mass ratio of polystyrene particles to polyacrylic acid particles is 2:3) 3kg;

(2) Apply UV-curable acrylic resin (model ZHU-1668) evenly on the back of the semi-finished product to form a 15μm thick film layer, and the finished product is obtained after curing.

The invention has simple steps, strong operability, uniform thickness and density of the optical film, has the characteristics of soft diffusion surface and is not easy to be scratched, and has excellent light diffusion function, high optical brightness, haze and light transmittance. , the haze of the finished product is above 90%, the light transmittance is above 80%, and the optical performance is excellent, which can meet the requirements of various sizes of LCD screens for high brightness.

The embodiment described above is only a preferred solution of the present invention, and does not limit the present invention in any form. There are other variations and modifications on the premise of not exceeding the technical solution described in the claims.

Claims (8)

1. the highlighted optical film producing method of high fog, it is characterised in that concretely comprise the following steps:

(1) light spreads coating be spread evenly across base material front and form upper Diffusion barrier layer, dry, after aging, cooling semi-finished product, Described light diffusion coating is made up of the component of following weight portion: methyl ethyl ketone 18 ~ 20 parts, pentaerythritol acrylate 15 ~ 17 Part, butyl acrylate 3 ~ 5 parts, poly-diethanol 1 ~ 3 part, Vinalac 5920 5 ~ 10 parts, dibutyltin dilaurate 1 ~ 2 parts, nano silicon 1 ~ 2 part, butyl acetate 15 ~ 17 parts, aliphatic polymeric isocyanate 3 ~ 4 parts, polyether-modified poly dimethyl Siloxanes 0.2 ~ 0.5 part, polymethyl 10 ~ 15 parts, polystyrene 14 ~ 15 parts, light diffusion particle 3 ~ 5 parts；

(2) backsize: the back side that ultraviolet curing acrylic resin is spread evenly across semi-finished product forms bright enhancement film layer, solidification After get product.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (1), light expands Dissipating coatings thickness is 5 ~ 10 μm.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (1), described Light diffusion particle is the one in polymethacrylates granule, granules of polystyrene, polysiloxane particle, polyacrylic acid granules Or it is multiple.

A kind of highlighted optical film producing method of high fog the most according to claim 3, it is characterised in that described smooth diffusion particle Particle diameter be 0.1 ~ 1 μm.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (1), described Base material is PET film.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (1), described Drying concretely comprises the following steps: be warming up to 100 ~ 120 DEG C, dries 40 ~ 60s.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (1), described Aging concretely comprise the following steps: aging 50 ~ 60h at 50 ~ 60 DEG C.

A kind of highlighted optical film producing method of high fog the most according to claim 1, it is characterised in that in step (2), ultraviolet The resin-coated thickness of light-cured acrylic is 15 ~ 20 μm.