Gypsum powder (CaSO4, 2H2O) is a commonly used material for restoring cultural relics, with white and delicate color and short solidification time.
Gypsum powder (CaSO4, 2H2O) is a commonly used material for restoring cultural relics, with white and delicate color and short solidification time.
1, gypsum powder 30%, epoxy resin 70%, fine and white, shiny surface after solidification, can be polished and colored, suitable for repairing ancient porcelain exquisite utensils.
2, gypsum powder 50%, epoxy resin 50%, white matte should repair color or carved ancient porcelain.
3. Gypsum powder 80% epoxy resin 20%, rough tread with small particles, suitable for repairing white and thick semi-porcelain. ?
If porcelain is not properly maintained, it will be seriously damaged, which is not conducive to the long-term preservation of porcelain, especially the fine products handed down from generation to generation and unearthed, which should be carefully maintained. The maintenance of porcelain must follow the principle of handling with care, and at the same time, the maintenance of porcelain should not be too much to avoid protective damage.
Due to poor fetal quality, uneven glaze color, or crystallization or deposition of one or more components synthesized in some porcelain glazes, when silica is deposited to a certain extent, the glaze will turn milky white, or the color and patterns on the ceramic body will be covered by opaque films; In this case, 1% hydrofluoric acid can be applied locally for a few minutes at a time, then the acid marks are washed off with distilled water, and then finely ground with fine metallographic sandpaper to restore its transparency as much as possible and expose the underglaze decoration. Glaze hardened lime can be removed by 5% hydrochloric acid or nitric acid.
Adhesives for porcelain should be colorless and transparent, with high bonding strength, strong anti-aging ability and fast curing speed. After bonding, it is difficult to distinguish the gaps between stubbles.
When bonding, we should follow the pre-designed plan and take care of the adjacent relationship. Generally, it can start from the bottom, and some can start from the edge of the mouth. But there can be no mistake in bonding one piece, and a dislocation will affect the whole device. After bonding, it must be squeezed and fixed with inch tape.
Glaze defects should be filled with resin and quartz powder to make paste, sludge or gypsum should be used as local molds, filled with resin paste, and then polished with sandpaper. The most difficult thing is to make glaze color. Porcelain is rich in glaze color, mainly acrylic quick-drying color and soft material. The combination of pen-spraying and hand-painting is used to treat each color and pattern separately. Glaze gloss can be selected from "glass white" paint, colorless and transparent two-component polyurethane varnish and acrylic varnish. After spraying, it can be polished with cloth or agate roller.
References:
Baidu encyclopedia porcelain