阅读说明：本技术 一种高雾高透过率光扩散膜的制备方法 (Preparation method of high-fog high-transmittance light diffusion film ) 是由 罗培栋 华雨莎 王梦娜 于 2021-09-03 设计创作，主要内容包括：一种高雾高透过率光扩散膜的制备方法,包括下列步骤S1：将环氧树脂单体、交联剂、液晶液滴、引发剂、玻璃珠混合在一起并搅拌至均匀,从而形成聚合物分散液晶涂料；S2：聚合物分散液晶涂料均匀涂布在两层PET基体薄膜中间,压合成三合一膜；S3：热固化：将压好的三合一膜通过加热固化得到具有高雾度高透过率的光扩散膜。本发明采用液晶液滴取代了传统光扩散粒子的作用,避免了光扩散粒子易团聚,入射光损失等问题,所制得的聚合物分散液晶膜具有高的雾度和高的光透过率(相对于现有的采用光扩散粒子的扩散膜而言)。而且通过改变液晶的含量,即可得到具有不同光学性能(光透过率和雾度)的光扩散膜。(A method for preparing a high-haze high-transmittance light diffusion film comprises the following steps of S1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together and stirring the mixture until the mixture is uniform, thereby forming a polymer dispersed liquid crystal coating; s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film; s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance. The invention adopts the liquid crystal droplets to replace the function of the traditional light diffusion particles, avoids the problems of easy agglomeration of the light diffusion particles, incident light loss and the like, and the prepared polymer dispersed liquid crystal film has high haze and high light transmittance (compared with the existing diffusion film adopting the light diffusion particles). And by changing the content of the liquid crystal, the light diffusion film with different optical properties (light transmittance and haze) can be obtained.)

1. A preparation method of a high-haze high-transmittance light diffusion film is characterized by comprising the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

25-40 parts of a single epoxy resin monomer;

4-20 parts by mass of a crosslinking agent;

40-70 parts by mass of liquid crystal droplets;

0.5-1 part by mass of an initiator;

0.5-1 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

2. The method of manufacturing a high haze high transmittance light diffusion film according to claim 1, wherein: the cross-linking agent is DEGDA, or PEGDA-200, or PEGDA-400, or PEGDA-600, or PEGDA-1000, or EGMP, or TTMP, or PTMP.

3. The method of manufacturing a high haze high transmittance light diffusion film according to claim 1, wherein: the initiator is benzoyl peroxide, tert-butyl hydroperoxide, dicumyl peroxide, diisopropyl peroxydicarbonate, potassium persulfate, azobisisobutyronitrile, azobisisoheptonitrile or diisopropyl peroxydicarbonate.

4. The method of manufacturing a high haze high transmittance light diffusion film according to claim 1, wherein: the diameter of the liquid crystal droplet is 1.5-5.0 μm.

Technical Field

The invention relates to a preparation method of a light diffusion film.

Background

At present, Liquid Crystal Displays (LCDs) are widely used in various fields, especially in information technology fields such as notebook computers, televisions, handheld game machines, mobile phones, etc., and have become the most popular display technology in use today. Conventionally, LCDs are non-self-luminous, and Light Emitting Diodes (LEDs) in a backlight unit (BLU) are multiple independent dense point light sources with high luminance, so the quality of the backlight performance directly affects the display quality of the LCD.

The light diffusion film is used as an important component of the LCD backlight module, can effectively solve the problem of high light intensity of the LCD, is used for improving the uniformity of illumination, expanding the visual angle and uniformly diffusing the light of a point light source or a line light source into a uniform and high-brightness surface light source through refraction. When light passes through the diffusion layer, the light passes through the medium with different refractive indexes, so that the light is subjected to a plurality of refraction, reflection and scattering phenomena due to different refractive indexes and incident light angles, and the light can be corrected into a uniform surface light source to cause an optical diffusion effect.

The current common diffusion film is generally coated with light diffusion particles on the surface of a transparent PET film, and light scattering mainly occurs at the interface of a resin matrix and the diffusion particles. Since the light diffusing particles are easily agglomerated, effective dispersion of the particles is difficult, and an ideal light diffusing effect is not obtained in some cases.

Disclosure of Invention

In order to overcome the defects of the diffusion film in the prior art, the invention provides a preparation method of a high-fog high-transmittance light diffusion film.

The technical scheme for solving the technical problem is as follows: a preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

25-40 parts of a single epoxy resin monomer;

4-20 parts by mass of a crosslinking agent;

40-70 parts by mass of liquid crystal droplets;

0.5-1 part by mass of an initiator;

0.5-1 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Preferably, the cross-linking agent is DEGDA, or PEGDA-200, or PEGDA-400, or PEGDA-600, or PEGDA-1000, or EGMP, or TTMP, or PTMP.

Preferably, the initiator is benzoyl peroxide, tert-butyl hydroperoxide, dicumyl peroxide, diisopropyl peroxydicarbonate, potassium persulfate, azobisisobutyronitrile, azobisisoheptonitrile or diisopropyl peroxydicarbonate.

Preferably, the liquid crystal droplets have a diameter of 1.5 to 5.0 μm.

The invention has the beneficial effects that: the liquid crystal droplets are used for replacing the traditional light diffusion particles, so that the problems of easy agglomeration of the light diffusion particles, incident light loss and the like are solved, and the prepared polymer dispersed liquid crystal film has high haze and high light transmittance (compared with the existing diffusion film adopting the light diffusion particles). And by changing the content of the liquid crystal, the light diffusion film with different optical properties (light transmittance and haze) can be obtained.

Detailed Description

The present invention will be described in further detail with reference to examples.

Example one

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

30 parts of a single epoxy resin monomer;

20 parts by mass of diethylene glycol diacrylate (DEGDA);

50 parts by mass of liquid crystal droplets;

0.6 part by mass of benzoyl peroxide;

0.7 parts by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

Example two

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

25 parts of a monoepoxy resin monomer;

10 parts by mass of polyethylene glycol (200) diacrylate (i.e., PEGDA-200);

70 parts by mass of liquid crystal droplets;

0.9 part by mass of t-butyl hydroperoxide;

0.6 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

EXAMPLE III

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

40 parts by mass of a single epoxy resin monomer;

4 parts by mass of polyethylene glycol (400) diacrylate (i.e., PEGDA 400);

40 parts by mass of liquid crystal droplets;

1.0 part by mass of dicumyl peroxide;

0.8 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

Example four

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

36 parts by mass of a monoepoxy resin monomer;

8 parts by mass of polyethylene glycol (600) diacrylate (i.e., PEGDA-600);

60 parts by mass of liquid crystal droplets;

0.5 part by mass of diisopropyl peroxydicarbonate;

0.9 parts by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

EXAMPLE five

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

35 parts by mass of a monoepoxy resin monomer;

5 parts by mass of polyethylene glycol (1000) diacrylate (PEGDA-1000);

65 parts by mass of liquid crystal droplets;

0.8 part by mass of potassium persulfate;

0.5 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

EXAMPLE six

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

32 parts of a single epoxy resin monomer;

15 parts by mass of ethylene glycol di (3-mercaptopropionate) (namely EGMP);

55 parts by mass of liquid crystal droplets;

0.7 part by mass of azobisisobutyronitrile;

1.0 part by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

EXAMPLE seven

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

28 parts by mass of a single epoxy resin monomer;

18 parts by mass of trimethylolpropane (3-mercaptopropionate) (i.e., TTMP);

45 parts by mass of liquid crystal droplets;

0.75 parts by mass of azobisisoheptonitrile;

0.65 parts by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.

Example eight

A preparation method of a high-haze high-transmittance light diffusion film comprises the following steps:

s1: mixing an epoxy resin monomer, a cross-linking agent, liquid crystal droplets, an initiator and glass beads together in parts by mass and stirring the mixture uniformly to form a polymer dispersed liquid crystal coating:

35 parts by mass of a monoepoxy resin monomer;

pentaerythritol tetrakis (3-mercaptopropionate) (i.e., PTMP) 12 parts by mass;

58 parts by mass of liquid crystal droplets;

0.55 part by mass of diisopropyl peroxydicarbonate;

0.85 parts by mass of glass beads;

s2: the polymer dispersed liquid crystal coating is uniformly coated between two layers of PET substrate films and is pressed into a three-in-one film;

s3: thermal curing: and heating and curing the pressed three-in-one film to obtain the light diffusion film with high haze and high transmittance.

Wherein the liquid crystal droplets have a diameter of 1.5 to 5.0 μm, and the liquid crystal droplets within this particle size range are all acceptable, and it is not required that all the liquid crystal droplets have a uniform size.