Composition for production of plate material

FIELD: production of plate material.

SUBSTANCE: proposed composition is made on base of dispersed raw material with modifying additive; plate material is made by molding the said composition at temperature of 160-190°C and pressure of 65-95 kg/cm2; molding time of 1 min per 1 mm of plate thickness. Used as modifying agent are acid by-products of oxidation of cyclohexane of caprolactam process at mass ratio to wood wastes of 50-70:30-50, respectively.

EFFECT: facilitated procedure of production of composition.

1 tbl

 

The invention relates to the production of plate materials of dispersed wood raw material, for example of the machining shavings and sawdust, which is a waste of mechanical processing of wood, and can be used to produce construction materials.

A known method of manufacturing composite materials using thermoplastic binders obtained by acylation of wood by mechanochemical method. Sawdust wood aspen (fraction of 0.4-0.75 mm) acelerou mechanochemically activated in the presence of magnesium perchlorate a mixture of acetic anhydride - butyric acid at 100°C for 6 hours. Acylated thus the wood used to obtain a slab of composite materials with wood and mineral fillers [Efanov M.V., L.A. Graf, Klepikov A.G. Composite materials on the basis of acylated wood // Plast. mass. - 2000. No. 7. - P.41-42].

The disadvantage of this method is the long duration of the process of acylation of wood, as well as the complexity of the hardware design of this process.

The invention aims to remedy these disadvantages. This object is achieved in that the press-composition based dispersion of raw wood as a modifying additive contains alkali runoff production is as caprolactam after you put it in an acidic form (to pH=7). Other binders are not used.

A significant difference of the invention is that the composition forms a plate material by pressing at a temperature of 160-190°C, pressure 65-95 kg/cm2time pressing 1 min per 1 mm thickness of plate, as a modifying additive side contains acidic oxidation products of cyclohexane production of caprolactam, representing 25-30%aqueous solution of acidic by-products of the air oxidation of cyclohexane following composition:

- adipic acid - 50-60%;

- glutaric acid - 30-35%;

amber and oxalic acid - 5-10%;

- the rest is monobasic acids (acetic, formic,

Valerian).

As of dispersed wood raw material use machining chips or sawdust, which is a waste of mechanical wood processing.

The inventive method of manufacturing a slab of material is as follows. Dispersed raw wood (machining shavings or sawdust) is mixed with an alkaline runoff caprolactam production, pre-translated in acidic form (to pH=7), taken in a mass ratio to the wood raw material 50-70:30-50 respectively. The mixture is then dried to a residual moisture content of 2-3%, form a fibrous Mat, pressed at a temperature of 160-190°C, pressure 65-95 kg/cm2 within 1 min per 1 mm thickness of the plate.

The test material was carried out according to GOST 10633-76, 10694-78 "particleboards. Test methods".

Test data defined according to the standard methods listed in the table.

Thus, the claimed composition under certain conditions it is possible to obtain a plate material with indicators of the "water absorption", "strength in static bending"in excess of the requirements of GOST 10632-89, and swelling in thickness satisfying this standard.

The proposed method can be implemented on standard equipment for the production of chipboard.

Table 1

Physico-mechanical properties of plate materials
ExampleThe amount of modifier, %Temperature pressing, °Pressure, kg/cm2Densities, kg/m3The tensile strength in bending, MPaWater absorption (2 hours),% Swelling in thickness in 2 hours, %
1 (DSP according to GOST 10632-89 for strata. 8-12 mm)-17550720-80016-18not specified12-15
230160/td> 651000107080
330160751100126020
430160851100205515
530160951100212015
650160651000136070
750160751000155530
850160851100231915
950160951100251715
1030180651000146680
1130180751100231520
123018085 1100241515
1330180951100251415
1450180651000146670
1550180751000245030
1650180851100251615
1750180951200251512
1830190651000116877
1930190751100203040
2030190851100232020
2130190951100251415
2250190651000 138070
2350190751000256530
2450190851200202018
2550190951200182515

Composition for the manufacture of plate-based material dispersed raw materials and modifying additives, characterized in that the composition forms a plate material by pressing at a temperature of 160-190°C, pressure 65-95 kg/cm2time pressing 1 min per 1 mm thickness of the plate, as modifying additives used side-acidic oxidation products of cyclohexane production of caprolactam, taken in the mass ratio of the wood raw material 50-70:30-50 respectively.



 

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1 tbl

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2 tbl

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