waterproof paper. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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waterproof paper. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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Here are the recipes waterproof paper.

Coated paper on both sides with a solution of 1 wt. hours of glycerin, 1 wt. hours of gelatin and 4 wt. hours of water, then dried and dipped in a 10% formaldehyde solution (for which ordinary commercial formalin is diluted with four volumes of water). The result is a paper so strong in terms of water resistance that even water vapor does not have a noticeable effect on it.

To give wrapping paper water resistance, dissolve in one vessel 75 wt. hours of white soap in 100 wt. hours of water, and in another - 3 wt. hours of gum arabic and 9 wt. hours of glue in 50 wt. hours of water. After a good dissolution of each composition separately, both solutions are thoroughly mixed and the paper is immersed in them, after which it is thoroughly dried.

Paper, especially the so-called oil paper, treated with a solution of 2 wt. parts of magnesium chloride and 1 wt. parts of grape sugar, the strength of which should be from 28 to 30 °Be (sp. from 1,225 to 1,246). Spread this solution on one side of the paper and dry it slowly with great care.

Impregnate paper (yarn or other material) first with some colloidal solution, for example, glue, gelatin and expose it to the action of a solution of nitrogen-chromium salt. Through this, the colloid, without the action of light, passes into an insoluble body, which is located in a homogeneous layer either on the surface of the substance or in its pores. This way of impregnating the material makes it impervious not only to thick liquids and fats, but also to water. A small addition of glycerol to the above colloid achieves greater elasticity and elasticity of the paper.

Transparent and impervious to fats and water paper is obtained by immersing good paper E in an aqueous solution of shellac and borax. In some respects, this paper resembles parchment paper. If the indicated solution is dyed with aniline paint, then a very beautiful paper is obtained, which is used for the manufacture of artificial flowers.

carbolic acid paper prepared by using carbolic acid in the amount of 80 g per 1 sq.m of paper. It is used for disinfection purposes, as well as for packaging fresh meat. The method of preparation is as follows: With moderate heating, melt 5 wt. hours of stearin, 6 wt. hours of paraffin in 2 wt. including carbolic acid. The melted mixture is smeared on paper with a brush. An even more effective paper, used for various purposes, is obtained if, instead of carbolic acid, a slightly smaller amount of nitric acid is taken, and then the same manufacturing method is used.

Waterproof sandpaper on both sides it is covered with powdered emery, on one side - larger, and on the other - very fine. The emery is attached to the paper with a waterproof adhesive. To prepare a waterproof elastic adhesive, melt 2 wt. hours of hard copal and add to it 3 wt. hours of linseed oil heated to a boil. When copal is dissolved in oil, the mass is slightly cooled and 8 wt. hours of Venetian turpentine, 8 wt. hours of oil varnish, 8 wt. hours of Venetian red paint, 125 wt. hours of Prussian blue, 125 wt. hours of litharge and 125 wt. hours of rubber.

All this must be thoroughly mixed and, if the mixture is very thick, dilute it with linseed oil. Glue is applied to paper with a brush. Grinding powder is applied to the paper in a thin layer. Humidity does not have a destructive effect on paper prepared in this way.

To make it waterproof signatures and labels they are immersed for a few seconds in strong sulfuric acid, then washed with water and dried. The labels and signatures treated in this way, as well as the printing ink on them, obtain a strong resistance to water, oils, alcohol and other substances. The seal itself should not be damaged by sulfuric acid, unless the signature has been completely dry.

Cardboard boxes, containing cartridges, fireworks and other objects that are afraid of dampness, water resistance is given as follows: 4 wt. hours of paraffin and 3 wt. hours of rosin are fused together and a box made of cardboard is immersed in the resulting uncooled liquid. The box is not removed until the liquid releases air bubbles forced out of the cardboard. After that, the boxes are taken out and dried, after allowing the liquid accumulated in the boxes to drain.

Author: Korolev V.A.

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Scientists have discovered a strange magnetoelectric effect in a symmetrical crystal. These two properties, magnetism and electricity, are related to each other in many strange and, according to scientists, surprising ways, and the magnetoelectric effect is one of them. It can be seen in some crystals. This is manifested in those cases when the electrical properties of the crystal act on the magnetic field and vice versa.

Another completely impossible way of interaction was unexpectedly discovered by science. A new magnetoelectric effect has been discovered in a symmetrical crystal. It was revealed in a crystal of a special type - in langasite.

This crystal is composed of lanthanum, gallium, silicon and oxygen, as well as holmium atoms. It has a symmetrical structure and was previously thought to eliminate the relationship between electricity and magnetism. Experts suggest that the relationship between the electrical and magnetic properties of crystals depends on the internal symmetry of the crystal.

A high degree of symmetry, when one side of the crystal is a mirror image of the other, in theory cannot have a magnetoelectric effect. But recent research has proven otherwise.

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This means that polarization is possible if positive and negative charges are slightly shifted in the crystal. Now this method can be easily proved using an electromagnetic field, where the key point is the strength of the magnetic field itself. The crystal structure turned out to be so symmetrical that it cannot allow the expected effect.

But in practice, in the case of exposure to stronger rays of the magnetic field, something happened: the holmium atoms changed their quantum state and acquired a magnetic moment, thereby violating the internal symmetry of the crystal.

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