Ultra-wide biaxially stretched diffuser plate and preparation method thereof, liquid crystal display and flat-panel LED lighting fixture
A liquid crystal display and two-way stretching technology, which is applied in lighting devices, other household appliances, lighting and heating equipment, etc., can solve the problem that the ultra-wide diffusion plate is difficult to manufacture, cannot adapt to the concept of multimedia display and lighting, and restricts the development of downstream products And other issues
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[0035] In order to prepare an ultra-wide diffuser plate and ensure high tensile strength, the embodiment of the present application provides a method for preparing an ultra-wide diffuser plate with a width of 0.8-4 m and a thickness of 100-3000 μm, including:
[0036] Continuously extrude the plastic melt to form a continuous sheet-like plastic stream, and calender the plastic stream to obtain the first diffuser plate; wherein, the melt index of the plastic melt is controlled within the range of 1.1g / 10min to 3.7g / 10min Inside;
[0037] Carry out the first stretching and the second stretching of the first diffusion plate; the stretching temperature of the first stretching and the second stretching are both controlled within the range of 105-150°C, and the stretching ratio is controlled at 1.3 ~4.0 range; wherein, the first stretching stretches along the longitudinal direction of the first diffuser plate, and the second stretching stretches along the transverse direction of the...
Embodiment 1
[0100] The thermoplastic raw material in the raw material tank 111, styrene monomer is pumped into the reactor 113 and the solvent circulation liquid in the solvent tank 110 is injected into the mixing tank 112, and the diffusion powder is added in the mixing tank 112 to make Diffusion powder and solvent are evenly mixed and poured into the reaction kettle 113 through a pump. In the reaction kettle 113, the polymerization temperature is maintained at 150°C and the pressure is 80kpa (a). The polymerization reaction generates a plastic melt with the diffusion powder evenly distributed. The plastic melt evenly distributed with diffusion powder is transported to the devolatilizer 115 through the gear pump 114, the material is heated to 260°C, and the unreacted raw material styrene and the circulating liquid are separated through a high vacuum degree of 3kpa(a). The separated raw material gas phase is cooled by the condenser 117 and enters the recovery tank 118, which is called a ci...
Embodiment 2
[0103] The production process is basically the same as in Example 1, except that the polymerization temperature is 148° C., the pressure is 78 kpa (a), and the material is heated to 265° C. in the devolatilizer, and the vacuum degree is 2.5 kpa (a). A diffusion plate with a thickness of 2.0mm and a width of 4m is formed by biaxial stretching.
[0104] The polystyrene material melt index of the diffuser plate produced is 2.8g / 10min, the thickness is 2.0mm, the maximum width is 4m, and the surface is frosted.
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