WO2006125400A1 - Nanocomposite, preparation method thereof and passive nano projection display screen made of nanocomposite - Google Patents

Abstract

A nanocomposite, a preparation method thereof and a passive nano projection display screen made of the nanocomposite are disclosed. The nanocomposite comprises main materials and additives. The said main materials include methyl acrylate, styrene and polystyrene, the said additives include brightness agent, plasticizer, toner, initiator, release agent. The preparation method comprises: at first, the main materials are mixed and polymerized, and a plasticizer, a initiator, a release agent are added in proportion; then a gas is exhausted by vacuum or ultrasonic wave, and a brightness agent and a toner are subsequently added, the resulting product is again polymerized and released after exhausting gas; next, the sample is taken out.

Description

 Nano-type composite material, preparation method thereof and passive nano-type projection display made therefrom

Technical field

 The invention relates to a nano-type composite material, a preparation method thereof and a passive nano-type projection display screen made therefrom. The display screen can be used for rear projection televisions, large engineering screens, and the like. Background technique

 With the enlargement of displays and display screens, the requirements for display quality are also higher. Patent No. zl01115478.0, entitled "A Method for Preparing a Free-Scale Nano-Photonic Material with Brightness Viewing Angle", Chinese Patent Publication No. CN1126987C, entitled "High Brightness Wide Angle Viewing Free Scale Nano Image Screen Preparation Method" "The Chinese patents all disclose the preparation method of nano-type projection display screen. The disadvantage is that there is still a "bright spot effect" on the prepared display screen, that is, the brightness of the center of the image screen is high, and a visible bright area is called a spot, a spot. Moving in the direction of viewing, the screen is extremely low, which affects the quality of the screen. The angle of view is small. When the mirror is not added, it can not meet the application requirements of high-end screens. Summary of the invention

 It is an object of the present invention to provide a nanocomposite.

 Another object of the present invention is to provide a method of preparing a nanocomposite.

 It is yet another object of the present invention to provide a passive nano-type projection display screen prepared from a nano-type composite material. One embodiment of the invention relates to a nanocomposite comprising the following components:

 (a) The main material, wherein the weight percentage of each component is - methyl methacrylate 10 - 100%

 Styrene 0- 90%

 Polystyrene 0-10%

 (b) Lightening agents, each by weight of the host material:

Si0 ₂ 0. 01-6%

Ti0 ₂ 0. 1-5%

A1 ₂ 0 ₃ 0-6%

 Any one of the above three materials or used in any ratio,

(c) Plasticizer, % by weight of the host material: 25-45% (d) Additives, by weight of the host material: 0. 01— 0. 5%

 (e) Initiator, by weight of the host material: 0. 01— 2%

 (b) The release agent, the weight percentage of the host material: 0. 5-2%.

 Wherein the plasticizer is dibutyl phthalate or methacrylic acid, or two of them are used in combination in any ratio. The toner is any one of carbon nanotubes, crystalline carbon or color masterbatch or used in combination in any ratio.

 The initiator is benzoyl peroxide.

 The release agent is stearic acid.

 Another embodiment of the present invention is directed to a method of preparing the above nanocomposite, the method comprising the steps of:

 (1) mixing the main material, polymerizing at 70-90 ° C for 20-30 hours, adding plasticizer and initiator in proportion, cooling to below 40 ° C, adding the release agent in proportion, vacuum or ultrasonic row Gas 20-50 minutes;

 (2) adding the brightening agent and the coloring agent to the main material in proportion, ultrasonically mixing and hooking, pouring into the mold, and exhausting in a water bath at 30-50 ° C;

 (3) Heat the mold to 60-105 ° C and polymerize for 2 to 10 hours.

 Yet another embodiment of the present invention is directed to a passive nano-type projection display screen prepared from the above-described nano-type composite material.

 The method of the invention adopts a polymer of methyl methacrylate and styrene, and is mixed with nanometer-sized inorganic particles to form a large-image display screen with high brightness, high contrast and high uniformity (for television and engineering screens). ), according to the application requirements, the thickness of the sheet is 0.5-10 mm or thicker, has been made into a 150" display screen, and can be made into any large size, and there is no seam that affects the image display. The Neil lens can be directly applied, the screen uniformity is more than 80%, the brightness can reach any value within 10, the viewing angle can reach 160°~180°, and it is not affected by the observation direction, especially in the vertical direction. The refractive index of the light-screening material can be greatly increased, and can vary from 1.4% to 1.58.

The light screen prepared by the method has bright color, transparent 髙, large viewing angle of up to 180°, high brightness, high color fidelity, high contrast, high light uniformity, can eliminate bright spot effect, can be bent, light weight, can be cut off It can be made into a large-sized back-projection front projection screen for various displays (LCD, LC0S optical machine) 360° viewing, can be made into an oversized engineering screen, the image does not show seams and other defects, low cost Wide range of applications, can be used for large-screen high-definition televisions (HDTV), especially when the screen size is greater than 50 ,, its performance / price ratio is high, coupled with high-pixel light machine and projector (such as EVD), can make the display The image is subtle, there is no point, grain, etc. on the screen when looking at it; the image is stable, and the large screen TV for home theater can be seen in the vicinity without discomfort, and can be used in small rooms, and because of the low price. , the family can pick up . This can be widely used in homes, concert halls, conference halls, shopping malls, airports, exhibition halls, restaurants, advertising boards, educational institutions (classrooms, etc.), control room curtain walls, high-profile large monitors, command posts, etc. detailed description

 Example 1 '

5重量%的聚合物液, at 70. The host material is methyl methacrylate 97.5 wt%, styrene 2. 5 wt% polymerized solution. C polymerization for 21 hours, adding plasticizer dibutyl phthalate (25% by weight of the main body), methacrylic acid (2% by weight of the main body), initiator benzoyl peroxide (% by weight of the main body 2 0%), release agent stearic acid (% by weight of the main body), ultrasonic exhaust gas for 20 minutes, adding a brightener nanoparticle: non-polar Si0 ₂ (% by weight of the host 0. 01%), Ti0 ₂ (% by weight of the main body, 0.3%) and a toner carbon nanotube (0.2% by weight of the main body), ultrasonically mixed, polymerized at 100 ° C for 3 hours, and released into a sheet having a thickness of 1 to 5 mm after demolding. After that, it has a 92% transmittance and a viewing angle of more than 30%. Example 2

Polymeric liquid of 50% by weight of methyl methacrylate and 50% by weight of styrene, polymerized at 70 ° C for 25 hours, added with plasticizer dibutyl phthalate (30% by weight of the main body), initiator Benzoyl peroxide 1%, release agent stearic acid (0.5% by weight of the main body), ultrasonic exhaust, addition of a brightener nanoparticle Si0 ₂ (% by weight of the host), A1A (occupied) 3% by weight of the main body, Ti0 ₂ (% by weight of the main body), added carbon nanotubes (0.5% by weight of the main body), ultrasonically mixed, polymerized at 85 ° C for 4 hours, demoulded into a material, The transmission rate is 81% and the viewing angle is greater than 100°. Example 3

The main material is 30% by weight of methyl methacrylate, 70% by weight of styrene, prepolymerized at 90 25 for 25 hours, and added plasticizer dibutyl phthalate (35% by weight of the main body), initiator benzoyl peroxide The acyl group (% by weight of the main body is 0. 05%), the release agent stearic acid (1% by weight of the main body), after ultrasonic mixing for 20 minutes, the addition of the sensitizer nanoparticles Si0 ₂ (% by weight of the main body 1.7%) , A1A (5% by weight of the main body), Ti0 ₂ (2.0% by weight of the main body) and crystallized carbon of the toner (0.5% by weight of the main body), after ultrasonic mixing for 20 minutes, put into the mold, The polymer was polymerized at 100 ° C for 6 hours, and after cooling, it was released into a material, and the transmittance was 90%, and the viewing angle was more than 120°. Example 4 The main material was 40% by weight of methyl methacrylate and 60% by weight of styrene. The polymer was polymerized at 80 ° C for 30 hours. After ultrasonic exhaust for 20 minutes, the plasticizer dibutyl phthalate (35% by weight of the main body) was added. The initiator benzoyl peroxide (0.01% by weight of the main body), the release agent stearic acid (1.5% by weight of the host), and the addition of the sensitizer nanoparticles Si0 ₂ (% by weight of the host) 5%〉, Α1Λ (% by weight of the main body), Ti0 ₂ (5% by weight of the main body) and colorant masterbatch (% by weight of the main body), after ultrasonic mixing for 50 minutes, The mold was polymerized at 105 ° C for 10 hours, demolded after cooling, the transmittance was 90%, and the viewing angle was greater than 140 °. Example 5

The host material is 90% by weight of methyl methacrylate, and 10% by weight of polystyrene is added at 90 ° C. After prepolymerization, a plasticizer dibutyl phthalate (38% by weight of the main body) is added, and the initiator is used. 5度之间。 The benzoyl peroxide (% by weight of the main body of 0. 0%), the release agent stearic acid (% by weight of the main body 2. 0%), added to the brightener nanoparticles Si0 ₂ (% by weight of the host 0. 5 ° /. ), AlaOa (% by weight of the main body 0.3%), Ti0 ₂ (1.7% by weight of the main body), after ultrasonic mixing for 50 minutes, polymerizing in a mold at 100 ° C for 5 hours, releasing the mold after cooling The transmission rate is 90%, the viewing angle is greater than 160 °, and the uniformity is 85%. Example 6

The main material was 40% by weight of methyl methacrylate, 57% by weight of styrene, 3% by weight of polystyrene at 90 ,, and polymerized for 30 hours. After ultrasonic exhaust for 20 minutes, the plasticizer dibutyl phthalate was added. The percentage of the body weight is 35%), the initiator benzoyl peroxide (0.01% by weight of the main body), the release agent stearic acid (1.5% by weight of the main body), and the addition of the sensitizer nanoparticles Si0 ₂ ( 4% by weight of the main body, Al ₂ 0a (% by weight of the main body), Ti0 ₂ (5% by weight of the main body), after ultrasonic mixing for 50 minutes, polymerization in a mold at 105 ° C for 4 hours, Released after cooling, the transmittance is 94%, the viewing angle is greater than 180°, the uniformity is greater than 85%, the color is bright, and the surface hardness is high, which can be made into a 100” screen.

Claims

Rights request A nanocomposite comprising the following components:  (a) The main material, wherein the weight percentage of each component is:  Methyl methacrylate 10—100%,  Styrene 0-90%,  Polystyrene 0-10%,  (b) Lightening agents, each by weight of the host material: Si0 ₂ 0. 01-6%, Ti0 ₂ 0. 1-5%, A1 ₂ 0 ₃ 0-6%,  Any one of the above three materials or mixed in any ratio,  (c) Plasticizer, by weight of the host material: 25-45%,  (d) The weight percentage of the host material: 0. 01— 0. 5°/. ,  (e) Initiator, by weight of the host material: 0. 01-2. /. , with  (b) The release agent, the weight percentage of the host material: 0. 5-2%.  2. The nanocomposite of claim 1 wherein the plasticizer is dibutyl phthalate or methacrylic acid or a mixture of two in any ratio.  3. The nanocomposite of claim 1, wherein the toner is any one of carbon nanotubes, crystalline carbon or color masterbatch or used in combination at any ratio.  4. The nanocomposite of claim 1 wherein the initiator is benzoyl peroxide.  5. The nanocomposite of claim 1 wherein the release agent is stearic acid.  The method for preparing a nanocomposite according to any one of claims 1 to 5, which comprises the following steps.  (1) Mix the main material, and polymerize at 70-9 (TC for 20-30 hours, add plasticizer, bow 1 hair agent in proportion, cool to below 4CTC, add mold release agent in proportion, vacuum or ultrasonic row Gas 20-50 minutes;  (2) adding the brightening agent and the coloring agent to the above-mentioned main material in proportion, ultrasonically mixing and hooking, pouring into the mold, and exhausting in a water bath of 30-50 ° C;  (3) Heat the mold to 60-105 Torr and polymerize for 2 to 10 hours.  7. A passive nano-type projection display screen prepared from the nano-composite of any of claims 1-5.