What are the processing methods of organic glass?
Adhesion: chloroform, commonly known as chloroform. Chemical products, colorless, transparent, liquid like. This product is volatile, with glass syringes and needles (a) penetration adhesive, because the product is on the corrosion of dissolved organic glass, make its cement, not the product contact without adhesion place. The glue is fixed according to the shape of the work and completely cured for 12 hours. Note: chloroform is not harmful to the hands, but it is poisonous and can not touch the eyes. Work to ventilation, it is said that the goods Jiuwen is inhaled into a coma.
Important points in hot bending of perspex:A. if you want to use water heating, do not "direct" heating by boiling, and use indirect heating so as not to change the size after moisture absorption.B. fixtures should be "level, smooth and clean" so as to avoid residual plastic lines and affect transparency.C. heating rate should not be too fast, should not exceed the thermal deformation temperature.D. cooling, the temperature of each part of the workpiece should be consistent. So the cooling rate is not too fast, otherwise heart with epidermal temperature difference caused by thermal stress, loosen fixture after deformation and back. Therefore, the cooling rate should not be too fast, the furnace will be better cold.The size of the E. after heat treatment will change slightly due to the two contraction, and the temperature should not be too high to reduce the shrinkage size.F. don't iron it, it will deform much more!G. specific heating time and temperature, it is necessary to experiment several times in order to master the best temperature, time.
Hot bending: shape shapes of organic glass through high temperatures.(1) hot bending method:Clamp the heating with a flat fixture.Hot air gun: heating is not uniform, easy residual uneven cooling caused by thermal stress, days after the easy deformation.Constant temperature furnace: the temperature is relatively average, and the temperature is more uniform when cooled.(2) the temperature and time of setting and tempering of plexiglass after heating:Generally use PMMA, 65-70 degrees, 3-5 hours (hot air heating method)Heat resistant with PMMA, 75-80 degrees, 3-5 hours (hot air heating method)Note: this treatment is to eliminate the residual molding forming residual stress, improve the size stability after the change; mechanical properties; improve the dimensional accuracy, or reduce the deformation.
