Acrylic sheet has excellent weather resistance, especially used outdoors, and has strong adaptability to the natural environment. Even if it is exposed to the sun and rain for a long time, its performance will not change; it has good surface hardness and luster, and its processing It has great plasticity and can be made into various shapes and products required. A wide variety of plates and rich colors
Another feature is that it has good light transmittance, it is a colorless and transparent plexiglass sheet, its light transmittance is as high as 90%; its anti-aging performance is good; its processing performance is good, it is suitable for both machining and thermoforming; acrylic sheet can be Dyeing, the surface can be painted, silk screened or vacuum coated. Non-toxic, even if it is in contact with people for a long time, it is harmless, and the gas produced when burning does not produce toxic gas.
There is also a kind of acrylic recycled board called recycled material, which uses recycled acrylic scraps, and after thermal degradation, a recycled MMA monomer, called methyl methacrylate, is obtained by chemical polymerization. After strict technological process, pure MMA monomer can be obtained again, and there is no difference in quality from newly synthesized monomer. However, the produced degradable monomers are not of high purity, and their quality and performance are poor after the sheet is formed.
Hardness is one of the parameters that best reflects the production process and technology of cast acrylic sheets, and is an important link in quality control. The hardness can reflect the purity of the raw material MMA, the weather resistance of the sheet and the high temperature resistance. The hardness directly affects whether the plate will shrink and bend, and whether the surface will crack during processing. Hardness is one of the hard indicators for judging the quality of acrylic sheets. The cast acrylic sheet has the highest hardness index at present, with an average Da Rockwell hardness value of 90 degrees.
Acrylic sheet is divided into cast sheet and extruded sheet according to the production process; according to the transmittance, it can be divided into transparent sheet, translucent sheet and color sheet; according to performance, it can be divided into impact-resistant sheet, anti-ultraviolet sheet, ordinary sheet and special sheet. Such as: high impact plate, flame retardant plate, frosted plate, metal effect plate, high wear-resistant plate, light guide plate, etc.
Cast Plate: High molecular weight, excellent stiffness, strength, and excellent chemical resistance. Therefore, it is more suitable for processing large-sized logo plaques, and the softening process takes a little longer. This board is characterized by small batch processing, incomparable flexibility in color system and surface texture effect, and complete product specifications, suitable for various special purposes.
Extruded sheet: Compared with cast sheet, extruded sheet has lower molecular weight, weaker mechanical properties, but higher flexibility. This feature facilitates bending and thermoforming processes with a short softening time. When dealing with large-sized sheets, it is beneficial to various rapid vacuum forming. At the same time, the thickness tolerance of the extruded sheet is smaller than that of the cast sheet. Due to the large-scale automatic production of extruded sheets, the color and specifications are inconvenient to adjust, so the variety of product specifications is limited to a certain extent.
The extrusion plate uses granular raw materials, which are extruded after being dissolved at high temperature, while the casting plate is directly cast and formed with MMA monomer. Although the extrusion plate is relatively smooth and clean in appearance, the polymerization is completed when the granular raw materials are formed. When processed into a plate, its structure and performance are weak, and it is not suitable for the material of outdoor marking products, but only for indoor products such as crystal characters or product brackets. In addition, since most of the extruded boards do not have UV protection, their outdoor service life is not comparable to that of cast boards, and the color will fade and be easily brittle until cracked. The cast plate is to complete the structural polymerization during the processing of the plate, during which the ultraviolet absorber is added, which has extremely high strength and UV function.
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