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TECHNOLOGY OF MANUFACTURING OF JOINT GLUE
When using carpentry glue, it is better to use glue, previously welded, and then dissolved by the measure of need for fire. But the good qualities of such glue are largely dependent on skillful cooking.
The most chosen glue is boiled out of horns, it has a beautiful light color. Razdrobiv into small pieces, glues are put in a vessel with cold water, where it is also left, until it softens so much that you can easily crush it with your fingers. This usually takes 3-4 hours . Then the water is drained, and pieces of softened glue are transferred to a small bottle, which is also put on the fire. Cooking lasts 15 minutes , until the glue turns into a monotonous, liquid, creamy density, a mass that does not contain a single slimy lump. During the time of cooking, the glue is stopped continuously with a stick to prevent it from burning, otherwise it is done so as not to let it burn, otherwise it becomes dark and also loses its share of gluing power. It should not also be subjected to the act of a violent flame, so that it does not boil over. If the glue has been soaked for a long time and has absorbed a lot of water, then it must be boiled gently for a longer time, until the surplus of water evaporates and the glue does not reach the proper density. The welded glue is poured onto a plate, on which it also allows it to cool. It turns out that the gelatinous mass, from which the pieces are cut, is also dissolved by heating.
We inform you of the following useful instructions for improving the quality of joinery glue. The usual joiner's glue is soaked in water, until it does not swell and does not turn into a relatively soft mass. After that, having drained the water, it is melted on the fire carefully and not for long, so that it does not burn out in any way. On the glue, the glue is diluted not with water, but with vodka, and another 100 g of carpentry glue is added with 12 g of alum in powder. Prepared in this way, the adhesive is very strong and also resists the action of water well.
Clay joinery, water-resistant
Clay joinery water-resistant can be obtained if you add a natural linseed oil or a paste in a 4: 1 ratio to the usual bone or glue paste, and stir the mixture until a homogeneous emulsion is obtained.
As you know, carpentry glue can not be preserved in liquid form for the following reasons:
1) Its solutions gelled already at 6 ° in Bohm;
2) they have a strong, extremely unpleasant odor and
3) they are very easily moldy.
However, ordinary joiner's glue can very easily be turned into a liquid, free from all these drawbacks. To do this, 250 g of carpentry glue is dissolved in 1 liter of hot water, mixed with 10 g of barium peroxide, rubbed with 5 g of sulfuric acid, at 66 ° in Bohm, and 15 g of water is also heated for 48 hours in a steam bath at a temperature of about 80 ° С. At the same time, an appreciable amount of sulfur dioxide is developed, also the glue solution takes on a flavorsome syrupy smell, loses its ability to gel, and later thickens up to half its original capacity, does not mold even with prolonged standing in the atmosphere. Such a solution has a weakly acid reaction and it also bonds very well. In dried form, the peroxide-treated glue has the look of plates very similar to gum arabic, and can successfully serve as a replacement for the latter, considerably exceeding its cheapness. With its adhesive power, the new product is incomparably higher than dextrin.
It should not be overlooked that when glue is trimmed with barium peroxide as sulfuric acid, significant amounts of barium sulfate go into solution, just as if a strong sugar solution similarly prevents barium from precipitating with sulfuric acid.