PC/PMMA alloy material for LED lampshade and preparation method of PC/PMMA alloy material

Abstract

The invention discloses a PC/PMMA alloy material for an LED lampshade and a preparation method of the PC/PMMA alloy material. The PC/PMMA alloy material is prepared from the following materials in parts by mass: 55 to 75 parts of PC; 15 to 35 parts of PMMA (Polymethyl Methacrylate); 4 to 8 parts of MBS; 4 to 8 parts of SMA; 1 to 3 parts of an organic silicon light diffusion agent; 0.2 to 0.4 part of an antioxidant; 0.1 to 0.3 part of a light stabilizer; and 0.3 to 0.5 part of a lubricant. The refractive index of the PC ranges from 1.491 to 1.498; the refractive index of the PMMA ranges from 1.490 to 1.500; the particle size of the MBS is 220 nm to 320 nm; the content of MA in the SMA is 10%-20%; and the particle size of the organic silicon light diffusion agent is 2-10 [mu]m. According to the scheme, the light diffusion PC/PMMA material with high transparency, high surface hardness, high toughness and high rigidity is prepared from PC and PMMA base materials with a specific direct incidence rate, the composite compatilizer, the flexibilizer with a specific particle size, the light diffusion agent, the antioxidant, the weather-proof agent, the lubricant and the like based on a traditional twin-screw extrusion process, and can be applied to LED lampshades.

Description

technical field [0001] The invention relates to the technical field of alloy materials, in particular to a PC / PMMA alloy material for LED lampshades and a preparation method thereof. Background technique [0002] Due to its long service life, low heat generation and high brightness, LED lamps have widely replaced energy-saving lamps for general lighting. Along with the LED lamp shell material with light diffusion effect, it has received extensive attention. It is characterized by allowing light to pass through and effectively scatter. Convert the light wave propagating in a single path into a divergent light source to improve the illumination range and illumination effect of LED lights. Therefore, most new light diffusion materials must use transparent matrix polymers, and achieve their light by adding special organic and inorganic polymer particles. Diffusion effect: Polycarbonate (PC), transparent polystyrene (PS), polymethyl methacrylate (PMMA), etc. are commonly used as ...

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Problems solved by technology

[0003] Polycarbonate (PC) is the preferred substrate for LED light diffusion materials because of its excellent light transmission properties, good mechanical properties, insulation properties, and certain flame retardant and anti-aging properties, but its hardness is low , Scratch resistance is not good, and the surface residual stress is large, which limits its application range in light diffusion plates; polymethyl methacrylate (PMMA) has high surface brightness, surface hardness and scratch resistance. The light diffusion plate has high application value, but its parts are brittle and the toughness is extremely low, and the application on some parts with high toughness requirements is greatly restricted; therefore, the preparation of PMMA / PC alloy light diffusion plate can maintain PMMA has high surface hardness and scratch resistance, and based on the high toughness and high rigidity of PC substrate, it can improve the impact strength of the material and improve the normal use of the material in high-strength and high-stress environments; it is made of PC / PMMA composite The material can take into account the advantages of the two at the same time and make up for the shortcomings of the two. However, the solubility product parameter of PC is 20.3, and the solubility product parameter of PMMA is 19.0. Theoretically, they are two thermodynamically incompatible systems, and direct blending modification is easy to make them The performance is reduced, and the continuous phase cannot be formed, resulting in an opaque state on the exterior light

[0004] The PC / PMMA composite material process is divided into two main methods: double-layer co-extrusion sheet and blended alloy. In order to ensure the transparency of PC / PMMA materials, double-layer co-extrusion technology is usually used, but double-layer co-extrusion technology requires special equipment. At the same time, only boards can be prepared, and the application range of the final product is greatly limited. However, if the compatibilizer or the base material is not selected properly for the preparation of PC / PMMA by blending modification, it is easy to appear delamination and opacity, and cannot be applied to light. Diffusion materials are used, and traditional blending modification must be pre-treated by specific process means in order to achieve high transparency of PC / PMMA, which greatly increases the complexity of the processing procedure, the uncontrollability of the processing process and the production cost

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