Polymethyl methacrylate, referred to as PMMA , is commonly known as plexiglass. It has the characteristics of hard, non-fragile, highly transparent, easy to dye and form, and has become a widely used transparent plastic material. Let's take a look at the performance and application of PMMA:
PMMA performance:
1. Physical properties (1) PMMA is highly transparent;
(2) Non-toxic and tasteless, with a density of about 1.18kg/m3, sinking in water;
(3) Flammable, the flame is light blue and the lower end is white. Foaming, melting and dripping when burning, accompanied by the smell of rotten fruits and vegetables.
2, optical performance
PMMA is a homogeneous thermoplastic with uniform texture, uniformity, uniform light transmittance of 92%, higher than inorganic silicate glass, and its transparency is the best among commonly used plastics. This is also the origin of its common name "plexiglass".
3, mechanical properties
PMMA has higher rigidity, but is slightly inferior to inorganic glass; impact strength is 7 to 18 times that of inorganic glass, toughness is not only much higher than inorganic glass but higher than PS, but much lower than ABS resin; insufficient hardness, surface grinding After the hair has a certain influence on transparency.
4, thermal performance
PMMA has a Tg of 105 ° C, a Vicat softening point of 100 to 102 ° C, and an embrittlement temperature of -60 ° C or less. Generally, PMMA can be used for a long period of time in the range of -60 to 65 ° C, and the short-term use temperature should not exceed 105 ° C.
5. Weather resistance Compared with other resins, PMMA has excellent weather resistance. After 4 years of aging test under outdoor atmospheric conditions, its tensile strength and light transmittance are only slightly decreased, the weight remains basically unchanged, the appearance color is yellow, but there is no crack, warp, foaming and the like.
PMMA application:
Application field | Use example |
Air traffic instrument building lighting illumination optics | 1. Aircraft cockpit cover, windshield, engine room, porthole, aerospace equipment 2. Bulletproof glass and window glass for automobiles and ships, windshields for roads for automobiles and motorcycles, road signs 3. Instrument parts, indicator cover, surface cover board, instrument panel 4. High-quality sanitary ware, marble, plexiglass bathtub, washbasin, etc. 5. Solar collector cover, forestry greenhouse, aqua submarine tunnel 6. Indoor and outdoor lighting fixtures, car taillights, traffic signal shades 7. Optical lenses (such as glasses, magnifiers, various lenses), laser protective glasses, optical fibers, TV screens |
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