Acrylic (ACRYLIC), also known as PMMA or acrylic, acrylic.
The chemical name for pmma. From the English Organic Glass (organic glass). Acrylicis an important thermal an earlier developed plastic.
Acrylic has transparency, chemical stability and weather resistance, good easy to dye,easy processing, beautiful appearance, in the construction industry, furnitureproducts, is widely used in sanitary ware.
The plexiglass product usually can be divided into pouring board, Extrusion board and plastic mold.
Acrylic products acrylic board, acrylic plastic grain, acrylic light boxes, signs, acrylic bathtub, acrylic artificial marble, acrylic resin, acrylic paint (latex) and so on the many kinds of products. Processing method of the common people to acrylic product line from raw materials acrylic aggregates, sheet metal or resin through various different,and with a variety of different material and function of the spare parts to be assembledof acrylic products. As for the general often hear acrylic fiber cotton, acrylic, acrylicyarn, acrylic nylon, refers to man-made fiber made by polymerization of acrylic acid,acrylic products are not associated with. Among them, people often say that theacrylic plate is polymethyl methacrylate Polymeric Methyl Methacrylate (PMMA) plate,which is composed of a "methyl methacrylate monomer (Methyl Methacrylate MMA)"polymerization. Or is composed of acrylic aggregates via extrusion machine extrusioninto. Previous known as organic glass plate. Organic glass English Organic Glass,PMMA board means made of organic compounds MMA, the transparent and transparency as glass general. Because all made of transparent plastics such as PS,PC or by poor recovery of MMA plates are collectively referred to as made of organic glass. For segmentation purposes, special to the PMMA board is made of high qualitypure material MMA are to call in the acrylic plate, and the general organic glass platesegmentation.
2 main classification
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Plexiglass (acrylic) plate type
Shenyang acrylic plate
Acrylic products (5)
A lot of material types. Ordinary plate: transparent plate staining transparent board,white board, color board; special plate: sanitary board, cloud plate, mirror panels,clamp plate, hollow plate, punching plate, flame retardant plate, super wear-resistant plate, the surface pattern plate, matte board, pearl panels, metal effect plate etc..Different performance, color and different visual effects to meet the ever-changingrequirements.
1, acrylic plate is divided into casting plate and extrusion plate according to theproduction process, according to the transmittance can be divided into thetransparent plate, a translucent plate (including dyeing plate transparent plate), color(black and white and color plate); according to the performance impact plate, anti ultraviolet radiation plate, common plate and special plate such as high impact plate,flame retardant sheet metal effect frosted plate, plate, high wear-resistant plate, light guide plate etc..
A: casting plate: high molecular weight, excellent rigidity, strength and excellentchemical resistance properties. Identification of plaque which is suitable for processinglarge size, relatively in the softening process for a long time. This sheet is characterized by small batch processing, has the incomparable flexibility in the color system and the effects of surface texture, and the complete product specifications,applicable to a variety of special purpose.
B: extruded board: compared with casting, extrusion plate lower molecular weight,higher mechanical properties of weak, flexible. However, this feature is helpful for bending and heat processing, softening time is short. In the treatment of larger size sheet, is conducive to the various quick vacuum forming. At the same time, the squeezing plate thickness tolerances than cast plates. Because the extrusion plate islarge batch production, color and specification of inconvenience conditioning, so the product specifications diversity is limited.
2, acrylic and a back plate is used acrylic material regeneration recycling scrap, afterthermal degradation was obtained after regeneration of MMA (methyl methacrylate)monomer, followed by the chemical polymerization reaction to. After a rigorous process, can be re obtained MMA monomer purity, and the new synthesis ofmonomer, there is no difference in quality. But the degradable monomers produced,the purity is not high, sheet metal forming, its quality and performance is very poor.
Summary: the use of granular material extruding plate, after high temperaturedissolved after extrusion molding, and casting plate is MMA monomer (liquid) is directly cast molding, although the extrusion plate shape is more smooth, but because of the particulate material molding to complete polymerization. In the processed into sheets when its structure and performance is weak, is not suitable for outdoor signsproducts materials, only suitable for crystal word or product support and other indoor products. In addition, because most of the extrusion plate is not anti ultraviolet function, the use of the outdoor life and cast plate is not the same, the color will fadeand easily embrittlement, until rupture. Casting is completed structure of polymerizedin sheet metal machining process, meanwhile adding UV absorber, strength and the function of UV is very high, outdoor life up to 5 years or even 10 years, the use ofcolor has been bright as new period.
Process characteristics
1, PMMA containing polar methyl side, are hygroscopic obviously, bibulous rate is in general 0.3%-0.4%, before molding must be dry, dry conditions are dry 4-5h 80 DEG -85 deg.
With non Newtonian fluid characteristics of effective apparent temperature range 2,PMMA in molding, the melt viscosity decreased with the increase of shear ratedecreased obviously, but also very sensitive to the change of the temperature of themelt viscosity. Therefore, for molding polymethylmethacrylate, increasing the molding pressure and temperature can significantly reduce the melt viscosity, has good fluidity.
