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What are the characteristics and production methods of semi-oil base

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What are the characteristics and production methods of semi-oil base Empty What are the characteristics and production methods of semi-oil base

Post by Admin Wed Mar 27, 2024 5:50 am


Semi-oil-based base is also called semi-absorbent base, which is usually brushed with emulsion paint, so it is also called emulsion base or Tempela base. There are many ways to use animal glue, latex, casein glue or eggs as emulsifiers.
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(1) The traditional practice of using animal glue: brush a layer of glue base with a mixture of 7:0 glue and water, dry with a large white powder or gypsum powder, plus an equal amount of zinc white, plus an equal amount of glue solution fully stir, and then add cooked flaxseed oil, the amount of which is 1/2 to 1/3 of the amount of white powder. The resulting primer is fluid and viscous, and can be used once or twice on a coated canvas.
(2) The practice of using latex: use a scraper to evenly scrape the ready-made latex onto a tautted canvas, and brush the emulsion several times if it is mixed with water. Let dry, sand lightly with sandpaper, and then apply acrylic paint (mostly white) with turpentine and a small amount of toning oil to the canvas. Or on the bottom layer of latex with white oil painting color, Litho powder, latex mixed primer coating or scraping on the canvas.
(3) casein rubber base:
① Casein glue solution: casein 50g + warm water 5ml + g ammonium carbonate. Note: Stir the casein with warm water and dissolve the ammonium carbonate in a very small amount of water. Pour the dissolved ammonium carbonate into the casein mixture. After the casein is fully dissolved, add 5 ml warm water and stir to a paste, then add 3 grams of sodium chloride (anti-corrosion), also dissolve in water, and then pour into the glue and stir well.
② Take 1 part synthetic casein glue solution + 1 ~ 3 parts water and brush the first layer of glue base.
③ After the first layer is dry, then brush the coating agent.
Preparation of coating agent: 1 part large white powder +1 part titanium dioxide or zinc white powder +1 part water +1 part casein glue solution, then take a half part of cooked linseed oil and drop several drops of ammonia water to shake into a emulsion, and then stir the two together to use.
(4) Egg base: In the glue into the egg or whole egg, and then slowly drop in some linseed oil, stirring method or shock method to form a thick emulsion of water oil. White powder and water in advance to paste, and then stir together with oil emulsion (can add some honey), coated with thin glue on the bottom of the painting can be coated two to one layer. In the past, refined bone glue or were used, but today latex, cellulose glue and glue can be used.
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