Preparation method of cellulose acetate membrane

Preparation method of cellulose acetate membrane Although cellulose acetate membrane is commercially available, it should be mastered in order to prepare itself when it is inconvenient to purchase. Equipment and equipment glass plate; glass rod; reagent bottle (300ml) that can seal the bottle mouth; thermostat; filter paper. Materials and reagents cellulose acetate; acetone; n-butanol. The experimental procedure first filled 100ml of acetone into the bottle, then charged 10g of cellulose acetate, sealed the bottle and placed it in a thermostat (37 ° C) for 2-3 days until the cellulose was completely dissolved. Add 75ml of n-butanol to the bottle, shake while adding, and then let stand at room temperature to let the bubbles out. Roll the ends of the clean glass rod with paper strips for 4-5 layers to control the thickness and heat insulation of the film, which is convenient for fingers to pinch. At the same time, preheat the clean glass plate in a thermostat (37 ° C). Pour the liquid in the bottle on a horizontal glass plate, and use the glass rod to push the liquid evenly and quickly to the other end. Remove the liquid to be poured when it is about to dry, and put it in the filter paper, make sure it is smooth, and flatten it with a heavy object and dry it for use. Discussion When pouring liquid, it should be poured in the center of one end as much as possible, not out of bounds. The glass rod should be pressed evenly and fast when pushed.

Dressing Table

Dressing table, also called toilet table, a table used for the toilet. The term originally was applied in the 17th century to small tables with two or three drawers. It soon became common practice to conceal the fittings of the dressing table when they were not in use, and great ingenuity was exercised by 18th-century cabinetmakers to combine elaborate fittings with a handsome piece of furniture.

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In the Cabinet-Makers` London Book of Prices (1788), Thomas Shearer included a design for a dressing stand [with folding tops. The top and bottom fronts are shams, in the back part of the stand is a cistern which receives water from the bason drawer . . . ." The inside included [A glass hung to a sliding piece, 3 powder boxes, a lift-out to hold 4 razors, hone and oil bottle, a ditto for combs, and partion`d off for tooth brushes, a shallow ditto for tweezers, knives etc. . . . ."

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Some dressing tables were combined with writing tables, a hybrid at which the French excelled. In the 19th century the dressing table, like other cabinet furniture, assumed heavier proportions and eventually became a matching part of the bedroom suite.

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