Method of producing wood-filled composite material

FIELD: process engineering.

SUBSTANCE: invention relates to production of wood-filled composite materials based on timber wastes and mineral binders. Proposed method comprises mixing wood filler with binder. Filler is treated in tight chamber in atmosphere of flue gases at 190-200C for 50-60 minutes. Then, prior to mixing, filler is processed in plasma-forming gas flow in discharge chamber at high-frequency generator power of 200-600 W and vacuum of 100-130 Pa for 250-280 s. Air is used as said plasma-forming gas fed at flow rate of 0.08-0.12 g/s. After mixing of filler and binder, molding and heat treatment are performed.

EFFECT: higher strength.

1 tbl, 2 ex

 

The invention relates to the production of wood-filled composites based on waste wood processing industries and mineral binders that can be used as building materials in various industries.

A known method of manufacturing a wood-filled composite material by mixing wood filler and binder, and pressing the resulting raw mixture, where as aggregate use wood chips in the number of 24-32 wt.%, and as a binder a mixture of, in wt.%: silica-containing waste product of aluminum fluoride 7-31, soda ash 0.3 to 6 and Portland cement - the rest, see SU inventor's certificate No. 1560509, MPK C04B 18/26, 1990.

The disadvantage of this method is to obtain a composite material with insufficient mechanical strength.

A method of obtaining a composite material by mixing wood filler and binder in fibroblastlike mill in the presence of grinding media (balls), see RU Patent No. 2157755, MPK7 B27N 3/02, 2000

The disadvantage of this method is the high absorption of composite material, leading to swelling and, consequently, the deterioration of its performance properties.

The closest in technical essence stavlaukumu method is a method of manufacturing a wood-filled composite material by mixing wood filler and a binder, before mixing the filler treated in the flow of plasma gas in the discharge chamber when the high-frequency generator 200-600 watts and vacuum equal to 100-130 PA, for 250-280 with, at the same time as the plasma gas using the air flow which is 0.08-0.12 g/s, and after mixing are forming and heat treatment, see RU Patent No. 2345886, MPK B27N 3/14 (2006/01), 2006.

The disadvantage of this method is the reduction in the operation of the tensile strength of the composite.

Object of the invention is increasing the strength of the composite material and preserve the strength of the composite material during its operation.

The technical problem is solved in that in the method of manufacturing a wood-filled composite material by mixing wood filler and binder before mixing the filler treated in the flow of plasma gas in the discharge chamber when the high-frequency generator 200-600 watts and vacuum equal to 100-130 PA, for 250-280 with, at the same time as the plasma gas using the air flow which is 0.08-0.12 g/s, and after mixing are forming and heat treatment, in the method before processing the aggregate flow of plasma gas is treated in a sealed chamber in the environment of the combustion gas is at a temperature of 190-200C for 50-60 minutes

Technical solution allows to increase the strength of the composite material and to maintain the strength of the composite material during its operation.

As the filler used, such as sawdust. Before processing the aggregate flow of plasma gas in the process chamber in the flue gas environment within 50-60 minutes After which the filler is sent to the camera for processing in the flow of plasma gas in the high-frequency generator 200-600 watts and vacuum equal to 100-130 PA, for 250-280 C. as a plasma-forming gas used air flow which is 0.08-0.12 g/s Then the filler is mixed with a binder, is subjected to the compaction press and heat treatment in the chamber, followed by exposure.

Example 1. A method of manufacturing a wood-filled composite material by mixing sawdust and binder

First, the filler is treated in a sealed chamber in the flue gas environment at a temperature of 190C for 50 minutes Then the placeholder process in the flow of plasma-forming gas in the chamber at the high-frequency generator 200 W and a pressure of 100 PA, for 250 C. as a plasma-forming gas used air flow which is 0.08 g/s followed by a stage of mixing, Faure, the Finance and heat treatment of the mass.

Example 2. A method of manufacturing a wood-filled composite material by mixing sawdust and binder

First, the filler is treated in a sealed chamber in the flue gas environment at a temperature of 200C for 60 minutes Then the placeholder process in the flow of plasma-forming gas in the chamber at the high-frequency generator 600 watt and vacuum equal to 130 PA, over 280 C. as a plasma-forming gas using the air consumption is 0.12 g/s followed by a stage of mixing, forming and heat treatment of the mass.

In examples 1 and 2 were produced samples of composite material with subsequent aging in a desiccator with a relative humidity of 100%. The prepared samples were tested for strength. The results of research on strength after fabrication of the samples of composite material and after 2 years of operation are presented in table 1. The maximum value of the tensile strength of a composite material in compression after 2 years of operation in wet conditions are a temperature in the processing of wood particles in the flue gas environment within 50-60 min in the range of 190-200C.

Thus, the technical solution allows to increase the strength of the composite material and to maintain strength to the position of the material in the course of its operation.

Table 1.
Examples
Prototype190C200C
The tensile strength of the composite material in compression, MPa4,46,36,5
The tensile strength of the composite material in compression, MPa, after 2 years of operation3,56,16,3

A method of manufacturing a wood-filled composite material by mixing wood filler and binder before mixing the filler treated in the flow of plasma gas in the discharge chamber when the high-frequency generator 200-600 watts and vacuum equal to 100-130 PA, for 250-280 with, at the same time as the plasma gas using the air flow which is 0.08-0.12 g/s, and after mixing are forming and heat treatment, characterized in that before processing the aggregate flow of plasma gas is treated in a sealed chamber in the environment of the flue gases when the tempo is the atur 190-200C for 50-60 minutes



 

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