Moulding composition for moulding finishing slabs

FIELD: chemistry.

SUBSTANCE: moulding composition relates to agriculture, particularly to processing flax production wastes and compositions for producing finishing slabs. The moulding composition contains pile of flax, urea-formaldehyde resin KF-NU, polyvinylacetate dispersion, hardener - ammonium chloride, with given ratio of components, wherein the pile of flax contains a crushed flax in ratio of (1-3):(9-7).

EFFECT: use of the composition enables to obtain low-toxicity finishing slabs with high water resistance.

2 cl, 2 tbl, 7 ex

 

The invention relates to agriculture, in particular the recycling of flax production, and relates to compositions for obtaining decorative plates. Great value for the industry is the problem of recycling of secondary material resources. For the flax is characterized by its multi-purpose. Processing libovolneho raw materials accompanied by a large amount of waste fiber in the stalk lobularity stem of the plant is about 15% by weight, the rest are waste in the form of short nepadomaja fiber 20-30% and fires 50-60%consisting of cellulose 40-50%), hemicellulose 15-20%, lignin 29-25%. Flax is used as fuel in the form of briquettes, which add peat or burned in furnaces of boiler mills. Currently flax shive in large quantities are used in thermal insulation, decorative plates.

Known for eco-friendly decorative plate formed from mixtures containing the original fire and the fire, which previously subjected to grinding, mixed with water to obtain a suspension.

(see Patent RU NO. 2081098, SW 18/24, 10.08.1997,)

The famous press composition for the production of plates containing flax, processed gidrolizuut agent is sulfuric or phosphoric acid and a modifying agent, select the tion from the group: iron salt, salt, zinc salt of copper.

(see Patent RU NO. 2202574, D27N 3/04, 20.04.2003)

A disadvantage of the known compositions are unsatisfactory performance properties of the obtained plates, which have a low resistance.

Famous raw mix for the production of building boards containing flax shive, water glass, sodium carbonate, epoxy Dianova resin.

(see Patent RU NO. 1779677, 04 B 28/26, 07.12.92)

However, plate, formed from known raw mix, emit harmful volatile substances, and therefore must be subjected to additional finishing.

The closest analogue declared the press-composition for the formation of the finishing plates is press-mass containing flax, urea-formaldehyde resin and hardener.

(see Author's certificate No. 859191, 1 WK 9/00, 30.08.81)

The lack of press-weight is the low resistance of the finished plates, and these plates are toxic due to the negative influence of the resin on the environment.

The development objective is to increase the efficiency of processing bonfires with getting plates with high operational and environmental parameters.

The technical result from the use of the invention to provide non-lethal finishing of slabs with high resistance, which is determined by the index of swelling in thickness at 24.

This technical result is achieved due to the proposed press-composition for forming decorative plates containing flax, urea-formaldehyde resin KF-WELL polyvinyl acetate dispersion and curing agent is ammonium chloride, in the following ratio, wt.% on the dry matter:

Fire flax87,3-91,4
Urea-formaldehyde resin KF-WELLof 5.4 to 8.3
Polyvinyl acetate dispersion1,1-3,4
Ammonium chloride0,9-1,2

this press composition in which the mass ratio of fire flax: crushed fire flax=(9-7):(1-3).

Obtaining non-lethal finishing plates of the proposed press of the composition is achieved by introducing the ingredients polyvinyl acetate dispersions and hardener ammonium chloride, which bind free formaldehyde. Formed plates have a low formaldehyde content and belong to the E1 class formaldehyde emission, which is consistent with the requirements of international standard.

In combination with the fires of flax these ingredients at the same time increase the resistance of the finishing square is t, which determine the swelling index plate for 24 hours.

Flax shive in the composition used without additional treatment or in combination with crushed flax bun to an average size of 5-10 mm when the mass ratio fires flax and ground fires (9-7):(1-3).

The invention is illustrated by the following examples. In the mixer download flax shive, through a nozzle under pressure serves pre-prepared mixture in a predetermined amount, containing curing agent is ammonium chloride, urea-formaldehyde resin KF-WELL (TU RB 00204547.075-96) and 20-50 wt.% polyvinyl acetate aqueous dispersion. Press the composition is stirred for 15-20 minutes until uniform distribution of fires flax, is poured into the mold, to form a certain thickness of the layer and pressed in two cycles. The duration of the first cycle 25-30 minutes at a pressure of 250 to 300 atmospheres and a temperature of 115-120°C, the second - 10-15 minutes at the same pressure and a temperature of 140-150°C.

The nominal dimensions of the plate are:

Thicknessfrom 10 to 25 mm +/-0,3
Long1800 mm+/-5,0
Width1200 mm+/-5,0

Flax shive use crushed KOs is Roy flax to 5-10 mm when the mass ratio (9-7):(1-3), the structure of the plate surface becomes flat and smooth.

Specific examples are presented in tables. In table 1 are given the specific formulations press the compositions of examples. Table 2 shows the physico-mechanical characteristics of finishing plates.

The change of the quantitative proportions of the ingredients of the press of the composition in the direction of increase or decrease does not reach the technical result.

As can be seen from table 2, the plates of the proposed press-composition compared with the closest analogue of swelling in thickness for 24 hours decreased in 2 times and was ~11%. The formaldehyde content (mg per 100 g of absolutely dry plate), these finishing plates is less than 8.0 including that corresponds to the class formaldehyde emission E1 to 8.0 including, but plate in comparative example correspond to the class formaldehyde emission E2 - over 8,0 30 including.

Thus finishing plate formed of a proposed press the compositions have high resistance and are non-lethal, which makes them widely used and no extra lining in the furniture and construction industries.

Table 1
The compositions of the press-composition for forming the CTD is lacnych plates
Components wt.% on the dry substanceExamples of p/p
1234567
Fire flaxto 91.163,0of 89.1of 87.391,481,990,3
Fire flax crushed-26,9---9,1-
Urea-formaldehyde resin KF-WELL6,86,68,38,16,6of 5.4-
Urea-formaldehyde resin----- -8,4
Polyvinyl acetate dispersion1,12,61,43,41,12,7-
The curing agent is ammonium chloride1,00,91,21,20,90,91,3

Table 2
Physico-mechanical characteristics of finishing plates
IndicesExamples of p/pComparative AU No. 859191
1234567
Density, kg / m3550850500 600620700650
Swelling in thickness for 24 hours (sample size 100×100 mm)%1291112131022
Tensile strength, MPa, not less than0,420,460,430,420,410,440,30
The formaldehyde content, mg per 100 g of absolutely dry plate6,14,36,96,35,95,632
Thickness, mm9,910the 10.110109,9the 10.1
The mass ratio of fire flax: crushed fire flax -7:3---9:1-

1. Press composition for forming decorative plates containing flax, urea resin KF-WELL polyvinyl acetate dispersion and curing agent is ammonium chloride, in the following ratio, wt.% on the dry matter:

Fire flax87,3-91,4
Urea resin KF-WELLof 5.4 to 8.3
Polyvinyl acetate dispersion1,1-3,4
Ammonium chloride0,9-1,2

2. Press composition according to claim 1, in which the mass ratio of fire flax:crushed fire flax=(9-7):(1-3).



 

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