1, Cleaning: Before repairing ancient porcelain, the fragments should be carefully cleaned. Dirt on fragments and traces of yellow and black dirt in old cracks can be soaked in clean water, bleaching powder, detergent and hydrogen peroxide. For calcified substances on the surface of ancient porcelain, salt substances can be washed off with hydrochloric acid, nitric acid or acetic acid at latitude 5- 10, and dirt and grease on them can be washed off with soft brush and bamboo tools. Cleaning work should be gentle, careful and diligent.
Continue or aggravate the damage to the fracture edge of ancient porcelain.
2. Correct spelling: This work is one of the most important links in restoring ancient porcelain. Before splicing and docking, it is necessary to carefully observe the shape, color and decoration of the remaining pieces of cultural relics to be repaired, and try to spell the number and design, and do all the preparatory work before bonding.
3. Bonding and reinforcement: according to the texture of the ancient porcelain to be repaired, the sealant is accurately selected. Before bonding, use 5- 15% polyvinyl acetate vinegar to reinforce the porcelain slag in the state of crisp powder. Because some porcelain pieces to be repaired are bulky and seriously damaged, there are requirements for the performance of the adhesive. Only by choosing adhesives with high bonding strength, strong anti-aging ability, good moisture resistance and moderate curing time can we repair high-quality ancient porcelain.
Epoxy resin is generally used as adhesive to repair ancient porcelain. There are many kinds of epoxy adhesives. Based on epoxy resin, some curing agents and additives are added. Linear epoxy resin is crosslinked into bulk structure after curing, which has the advantages of high bonding strength, good chemical resistance, good electrical insulation and small shrinkage. Of course, with the development of science and technology, many adhesives have appeared, which can also be used for porcelain restoration. However, it should be considered to choose colorless, transparent, high adhesive strength, aging resistance, good water resistance, high humidity resistance and easy operation at room temperature.
4. Matching: After the porcelain is bonded, the repair work is only half completed. Because there are often bonding seams and incomplete parts between bonded and integrated tiles, it is necessary to supplement these seams and incomplete parts. It is to be filled with colored putty, which is what painters call scraping. Putty should be made of raw materials with strong adhesion (generally made of resin, porcelain powder or quartz powder, talcum powder and pigment) and appropriate fillers. Then use a small putty knife to scrape layers of putty on cracks and incomplete places. After scraping, each layer of putty should be dried, and then polished with sandpaper to form micro putty.
A thin layer can cover the bonded and incomplete parts, and truly fill the gaps and the incomplete parts, so it is best to look at them with the naked eye and basically do not fill the traces.
5. Coloring: Coloring is the most difficult and important process in the restoration of ancient porcelain. The level of restoration mainly depends on whether the appearance color is consistent with the original and whether it can be restored to the original itself, which is the main reason for the current level of porcelain restoration. At the same time, it is closely related to raw materials, such as poor light fastness and easy discoloration. For more information, please visit Bobaozhen Mall to check for yourself.