The composition and scope of casein glue, how to do it yourself
Natural casein glue is indispensable if you need an environmentally friendly adhesive that is harmless to health and at the same time available for production. The substance is made from milk protein on an industrial and household scale. Can be purchased ready-made at hardware and hardware stores. Excellent for bonding wood, paper, leather surfaces.
Description and varieties of casein
Casein powder looks like gray pellets. When the product is diluted, it turns into a sort of paste in color and consistency. In appearance, the varieties differ in the color and size of the granules, the presence of inclusions and lumps.
Higher
Premium casein is a homogeneous mixture without impurities. The granules do not exceed five millimeters. The color of the powder is white or cream without any inclusions.
First of all
The grains can be stuck together, but are easily separated by hand. The shade of the mixture is light yellow.
Second
The yellow granules reach 10 mm. The composition may contain small lumps. A low content of mechanical impurities is acceptable.
Third
Dark yellow powder interspersed with a brownish tint. Granules can vary in size. The composition also includes mechanical impurities.
Composition and properties of the adhesive
Casein glue is of animal origin.... The basis is milk protein, to which various components are added in order to improve individual properties, for example water resistance. The granulated powder dissolves well in water without leaving lumps.
Rosin
Rosin is familiar to anyone who has ever tried soldering. But in addition to being used in soldering as a degreaser, the substance is widely used in other areas, including in the manufacture of casein glue. Promotes shelf life.
The water
Water is used to dilute the casein powder. As a rule, liquid and dry mixtures are taken in equal proportions.
Nitrates and Phosphates
Nitrates are salts and esters of nitric acid, ammonium and certain metals (nitrate) used in engineering, medicine and as mineral fertilizers in agriculture. Phosphates are salts of phosphoric acids found in fertilizers and used in the production of many drugs.
Amino acids
Amino acid is an organic acid with one or more amino groups. There are over 400 different amino acids in total. Amino acids are part of sports nutrition and compound foods, they are used in the food industry as flavoring additives.
Calcium caseinate
A protein commonly used by bodybuilders. The product is slowly absorbed, suppresses appetite, slows the breakdown of other proteins.
Sodium bicarbonate
Sodium bicarbonate is another name for common baking soda. It is used in daily life, kitchen, medicine, food and chemical industries.
Lime
In the production of casein glue, they mainly use slaked lime - fluff. Quicklime in the air loses its properties and may also contain unwanted impurities.
Kerosene
Adding kerosene to powdered casein glue prevents dusting and delamination into separate components during transportation.
Purpose and scope
The scope of application is due to the properties of the adhesive. Since it fixes wooden and paper surfaces well, the composition is actively used in the construction and furniture industry. Environmental friendliness of the substance allows it to be used in the food industry.
furniture manufacturing
In furniture production, casein glue is often used to make durable wooden furniture.
The composition has several advantages:
- resistance to high temperatures;
- security;
- non-toxicity;
- water resistance;
- improve tree structure.
Building
During construction work, sealants and sealants containing a substance are indispensable. Casein paints are used to decorate the facades of concrete, brick and plaster buildings, as well as to obtain washable interior decoration.
Painting and typography
Casein paints are used in painting and printing. So, casein oil paint in emulsion is used for decorative painting on cardboard, canvas, wood, concrete and stone, it is applied to a primed surface.
Chemical industry
Acid casein is used in the chemical industry as an additive in the manufacture of paper. Part of varnishes and paints. The color and cosmetics industry is also a large consumer of casein.
Food industry
As a natural animal protein, casein is very nutritious. This protein is often found in infant formula and nutritional supplements for athletes.
Label making
Using casein glue, in a number of industries labels are glued to glass containers. In such a case, the modified starch is generally included in the composition.
Iconography
Since ancient times, paints of animal origin, for example egg paints, have been used to paint icons. Currently, casein paints are often used, since after drying they are waterproof, but at the same time breathable, that is, they are permeable to gases and moisture.
Advantages and disadvantages
Casein glue has its pros and cons.
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Manufacturers
Casein is produced both in Russia and abroad. Casein is mainly produced by dairies, as this protein is the main protein found in milk.In addition, dairies act as raw material suppliers for large companies in the pharmaceutical, paint and varnish, woodworking, adhesives, textiles, perfumery and many other industries.
At the same time, European casein manufacturers are distinguished by the quality of their products due to the use of modern technical methods in the manufacture of the product.
How to make at home using different methods
Casein glue is not so difficult to make yourself.The resulting composition is unlikely to differ favorably in cost from the finished mixture. However, you can resort to crafting methods if you want to experiment, or stores are unavailable for some reason.
First of all
Casein glue is made from fat-free cottage cheese, rubbed through a fine sieve. The resulting substance is washed with water and combined with a small amount of ammonia, mixing the composition until smooth.
Second
The initial product is sour curd skimmed milk, which is passed through cheesecloth and washed with water. The resulting mass is placed in a cloth bag and boiled until the remaining fat disappears, then dried to a powder state. To use a semi-finished product as a glue, dilute it with water and add borax.
Third
Table vinegar (3 tablespoons) is added to a liter of warmed milk and kept on fire until curdled lumps form. The mass is passed through cheesecloth and placed in a saucepan, after which it is topped up with soda (50 g) and water (3 tbsp).
Fourth
A mixture of the following components is infused for 2 hours:
- casein powder - 1 tbsp;
- slaked lime - 1 g;
- rosin - 4 g;
- water - 3 tbsp.
Add to the resulting mass a prepared composition of 100 ml of water and 2 g of borax, mix well.
Powder
To make glue from the purchased casein powder with your own hands, it is enough to combine it with water, the amount is 2 times higher than the dry mixture. The composition is usable within 5 hours after preparation, after which the glue will irrevocably lose its properties.
General application rules
As with any glue, surfaces should be cleaned and prepared before using the casein compound. If it is a tree, then it is necessary to sand it. Then the glue is applied to both surfaces, after which they are tightly tied and placed under a press or fixed with special clamps until the glue is completely dry.
Common Mistakes
Casein glue is rather short-lived when diluted. After 5 hours, the composition will lose most of its properties, so it is better to use it immediately after preparation. When diluting the powder yourself, it is important to pay attention to the fact that there are no lumps that interfere with the even application of the composition.
Additional tips and tricks
When using casein glue, you need to remember some rules:
- Before work, you need to prepare the workplace: cover the table and, if necessary, the floor with paper.
- It is advisable to protect your hands with gloves.
- It is better to remove excess glue immediately after application, then it will be more difficult to do this.
- The glue is usable within 4-5 hours after dilution, after the loss of properties it is impossible to resuscitate it.
- To prevent the formation of mold, ammonia is added to the composition.
When choosing an adhesive for repairs, carpentry or crafts, it is important to pay attention to environmental friendliness and the availability of the composition. Casein glue, due to its natural origin, is absolutely safe for health. Given the good fixing properties, the composition is practically irreplaceable in the case of working with wood, cardboard, porcelain, fabric, plastic.