RU2457232C1 - Adhesive composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: adhesive composition contains a basic component in form of a residue of beer yeast which is a brewing industry waste, glycerine and boric acid and, additionally, glutaric dialdehyde. The residue of beer yeast is first treated with sodium hydroxide solution in ratio 1:0.8.

EFFECT: invention increases adhesive capacity, water-resistance and adhesion strength.

2 tbl, 1 ex

Description

The invention relates to the field of production of glue used in the woodworking, furniture and paper industries.

Known adhesive composition containing as the main component a precipitate of brewery or alcohol yeast, which is a waste of the beer or alcohol industry and treated with a 2% sodium hydroxide solution in a ratio of 1: 1, glycerin and boric acid (RU No. 2404222, IPC C09J 201/00 , C09J 189/00, D21H 21/16, D21H 17/00, published on November 20, 2010).

The disadvantage of the specified composition of the adhesive composition is the relatively low viscosity, adhesive ability on wood and moisture resistance.

The technical result consists in increasing the adhesive ability of the adhesive composition on wood and moisture resistance.

The essence of the invention lies in the fact that in the adhesive composition, comprising as the main component, the brewer's yeast precipitate, which is a waste of the beer industry and treated with sodium hydroxide solution, glycerin and boric acid, to the main component containing brewer's yeast precipitate, treated with a 5% solution sodium hydroxide in a ratio of 1: 0.8, add 5% glutaraldehyde, in the following ratio, wt.%:

Sediment brewed yeast processed 5% sodium hydroxide solution in a ratio of 1: 0.8 93.0-95.0 Glycerol 4.0-5.6 Boric acid 0.1-0.3 5% glutaraldehyde 0.8-1.2

Sediment of residual brewer's yeast - a precipitate obtained after centrifugation of residual yeast. In the production of beer, solid waste is yeast cells (0.25-0.40 kg per 1 liter of beer), malt and hop grains, protein precipitate from the separator. Residual brewer's yeast is a dense mass with a specific yeast taste with a slight hop bitterness and smell characteristic of fresh yeast. The mass fraction of solids in residual brewer's yeast is up to 15 wt.%. Yeast contains 24-30% solids, which are 90-95% composed of organic substances. Proteins and other nitrogen-containing substances in yeast contain 54-56%, carbohydrates - 24-40%, fats - 2-5%. The most famous yeast proteins are zymocasein (phosphoglobulin) and cerewizine.

An example of the preparation of the adhesive composition. First, the residual brewer's yeast is treated with a 5% sodium hydroxide solution in a ratio of 1: 0.8 for 30 minutes and centrifuged for 15 minutes to obtain a modified precipitate of brewer's yeast. In the preparation of the adhesive composition, the components were taken in the following proportions (Table 1). These components are mixed constantly for 10-20 minutes. The viscosity is regulated by the addition of water, it should be in the range of 90-110 dPa · s for gluing wood and 40-50 dPa · s for gluing paper.

Tests of the obtained compositions gave the following results (table 2).

Compared with the known solutions, the proposed composition of the adhesive composition can increase the moisture resistance, the adhesive ability to "conditional strip" by 10-15%, the bonding strength of wood 2-2.5 times and it can be used for bonding both wood and paper.

Table 1 Components The content of components, wt.% one 2 3 Prototype Sludge brewer's yeast treated with a 5% solution of sodium hydroxide in a ratio of 1: 0.8 93.0 94.0 95.0 - The precipitate of brewer's or alcoholic yeast treated with a 2% solution of sodium hydroxide in a ratio of 1: 1 - - - 96.0-98.0 Glycerol 5,6 4,5 4.0 1.9-3.7 Boric acid 0.1 0.3 0.2 0.1-0.2 5% glutaraldehyde 1.3 1,2 0.8 -

table 2 Glue characteristic compositions one 2 3 Prototype Adhesive Strength, kg 3.80 3.90 3.90 3.60 Bonding strength of wood, MPa:
with dry test 21.0 22.0 21.0 8.0 with wet test 14.5 15.0 14.0 1,0

Claims (1)

An adhesive composition comprising, as a main component, a brewer's yeast precipitate, which is a waste from the beer industry and treated with sodium hydroxide solution, glycerin and boric acid, characterized in that the main component containing brewer's yeast precipitate, treated with a 5% sodium hydroxide solution in the ratio 1: 0.8, add 5% glutaraldehyde in the following ratio, wt.%:
Sediment brewed yeast processed 5% sodium hydroxide solution in a ratio of 1: 0.8 93.0-95.0 Glycerol 4.0-5.6 Boric acid 0.1-0.3 5% glutaraldehyde 0.8-1.2