Method of producing biological composite material

FIELD: process engineering.

SUBSTANCE: invention relates to production of construction materials, particularly, to fabrication of compacted wood biological composite materials. Proposed method comprises making biological composite material including biological binder and saw dust. Produced material is dried to make a mat by cold compaction and subjected to hot forming. Saw dust is mixed with biological binder based on culture broth obtained in cultivation of Leuconostoc mesenteroides bacterium on nutrient medium. Said medium consists of the mix of molasses, wastes of sugar production, and lactoserum taken in the ratio of 2:2:1 at temperature 24-26°C for 72-96 hours in static conditions with addition of liquid glass in concentration of 2.5 wt %.

EFFECT: moisture-resistant nonpolluting materials without phenol compounds.

1 ex

 

The invention relates to the production of building materials and can be used in the manufacture of pressed wood biocomposite materials.

There is a method of manufacturing extruded composites, namely, that sawdust is subjected to biological effects of solid-phase cultivation lignolytic fungus Panus tigrinus BKM R-3616 E for 2.5-3 days, dried, forming a carpet of cold-pressing and spend hot pressing at a pressure of 5.0 MPa and a temperature of 160-170°C (EN 2193481, M CL727N 3/00, publ. 27.11.2002).

The disadvantage of this method is the long processing time of sawdust legalities fungus, high flow inoculum (4000 ml) for 1 kg of sawdust, which increases the cost of the composites obtained.

The technical result consists in obtaining clean moisture resistant biocomposite materials without phenolic compounds, as well as in reducing their cost of manufacture.

The invention consists in that in the method of manufacturing a biocomposite material containing biological binder and wood chips, including drying, forming a carpet of cold-pressing and hot pressing, sawdust mixed with biological binder based on the culture fluid obtained the ri cultivation of the bacterium Leuconostoc mesenteroides on a nutrient medium, consisting of a mixture of molasses, which is the waste of sugar manufacture, bards, which waste the alcohol industry, and whey, which is the waste of the dairy industry, in the ratio 2:2:1 at a temperature of 24-26°C for 72-96 hours under static conditions with the addition of liquid glass in a concentration of 2.5%.

Example. Sawdust is mixed with the culture fluid (1 kg of sawdust 1.2 l of culture fluid containing the polysaccharide dextran, get the press a lot. In addition, in press-a lot make liquid glass (in a concentration of 2.5%) to reduce the water absorption of biocomposite materials. Culture liquid prepared by the method of culturing at a temperature of 24-26°C for 72-96 hours microorganism Leuconostoc mesenteroides on a nutrient medium consisting of a mixture of molasses (molasses), which is the waste of sugar manufacture, bards, which waste the alcohol industry, and whey, which is the waste of the dairy industry, in the ratio 2:2:1. The pre-inoculum Leuconostoc mesenteroides within days at a temperature of 24-26°C grown on sharonostalgia medium of the following composition (g/l): yeast extract - 20,0; potassium phosphate disubstituted - 20,0; magnesium sulfate - 0,2; manganese sulfate is 0.01; the sodium chloride is 0.01; calcium chloride - 0,02; ferrous sulfate and 0.01; sugar - 40,0; pH 6,9 be installed using a 1 is. H3RHO41 N. NaOH, as described in the article (Dols M.Growth and energetics of Leuconostoc mesenteroides NRRL B-1299 during metabolism of various sugars and their consequences for dextransucrase metabolism of various and their consequences for dextransucrase production /M.Dols, W. Remaun-Simeon, N.D. Lindley, P.F. Monsan // Appl. Environ. Environ. 1997/ Vol.63, No. 6. P.2159-2165). Components prepared by press-mass is thoroughly mixed and dried to a moisture content of 10-12%, forming a carpet of cold-pressing and spend hot pressing at a pressure of 40 kgf/cm2the temperature of 120°C. the Obtained plastic comply with GOST 10632-2007 strength (not less than 17 MPa) and density (not more than 1180 kg/m3).

Compared with the known solution proposed allows to obtain clean moisture resistant biocomposite materials, and reduce cost by lowering the temperature of extrusion and use as a binder waste of food production.

A method of manufacturing a biocomposite material containing biological binder and wood chips, including drying, forming a carpet of cold-pressing and hot pressing, wherein the sawdust is mixed with the biological binder based on culture liquid obtained by culturing the bacteria Leuconostoc mesenteroides on a nutrient medium consisting of a mixture of molasses, which is the waste of sugar manufacture, bards, is what the growing waste the alcohol industry, and whey, which is the waste of the dairy industry, in the ratio 2:2:1 at a temperature of 24-26°C for 72-96 h in static conditions with the addition of liquid glass in a concentration of 2.5%.



 

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