SU1361223A1 - Method of producing fibreboard - Google Patents

Abstract

The invention relates to the technology of manufacturing wet-formed fibreboard and reduces the pollution of wastewater and the air basin. Mixed chips, consisting of 50% of softwood chips and 50% of hardwood chips, are milled to a grinding degree of 18-20 DS. Then a paraffin or ceresin emulsion in an amount of 0.016% and a phenol-formaldehyde resin in an amount of 0.008% by weight of the suspension are added to the fibrous suspension with a concentration of 1.3%. A part of the pulp, ground to 18-20 DS, is taken and grinded to the degree of grinding 50-100 DS, a suspension of 1.3% is prepared from it, and ceresin or paraffin emulsion is introduced into it in the amount of 0.9-1.1 % and 0.6-1.9% of pretreated technical lignosulfonates (based on a 50% concentration) by weight of absolutely dry fiber. Dp processing lignosulfonates technical use liquid glass and processing is carried out for 20-40 minutes at 40-60 ° C. The bulk is fed to the grid of the sheet machine, where it is dehydrated. With a dry carpet of 10%, a composition of highly ground fiber with a water-repellent emulsion and modified technical lignosulfonates is poured. Then the fibrous carpet is pressed and dried. 2 tab. (Y) with: so about tL. you go 05

Description

The invention relates to methods for preparing wet fibrous LIT fibers and is intended for use in pulp and paper and wood processing industries.

The aim of the invention is to reduce pollution of wastewater and air.

The essence of the invention is that with the method of manufacturing fiber boards, including wet forming a fibrous wood fiber carpet with a grinding degree of 18-20 DS, paraffin or ceresin emulsion and phenol formaldehyde resin, the preparation of the coating layer is made by adding to technical material and liquid glass lignosulfonate wood material, applying a coating layer of the prepared composition on a fiber carpet, pressing and drying, before adding ligna to the wood material Sulfonates and liquid glass are mixed and the mixture is kept at 40-60 ° C for 20-40 minutes, while ceresin or paraffin emulsion is additionally introduced into the coating layer in the amount of 0.9-1.1% by weight of absolutely dry fiber and as a wood material. wood fiber with a grinding degree of 50-100 DS is used, and the application of the coating layer is carried out in bulk with the moisture content of a fibrous carpet of 90-95%,

The use of lignosulfonates modified with liquid glass provides an increase in the quality of the plates, allowing a significant reduction in the consumption of phenol-formaldehyde resin.

Example 1: Mixed chips, consisting of 50% coniferous chips and 50% hardwood chips, are milled to 20 DS, then ceresin emulsion in an amount of 0.016% and phenol-formaldehyde resin (CFF) are added to the fiber suspension of 1.3% the amount of 0.008% by weight of the suspension.

A part of the mass, ground to 20 DS, is taken and ground in disk mills up to 50 DS, a suspension with a concentration of 1.3% is prepared and 1.1% of the weight of absolutely dry fiber is injected with ceresin emulsion and 0.6% of Mass is absolutely dry fibers of pretreated technical lignosulfonates in terms of 50% concentration. The treatment of lignosulfonates with liquid glass is carried out for 20 minutes and 40 ° C, while the consumption of liquid glass is 1.0% by weight of the lignosulfonates.

The bulk in the amount of 2.9. kg / m is fed to the grid of the sheet machine, where it is partially dehydrated. When the carpet dryness reaches 10%, a composition based on highly ground fiber with a hydrophobic emulsion and modified liquid glass lignosulfonates (LST) in an amount of 0.3 kg / m is poured into the composition, while the total mass of the plate is 3.2 kg / m,

The cast layer has a mass of 300 g / m, 0 the volume of the fibrous suspension of the bulk layer is 23000 g.

Modified liquid glass LST set in the bulk layer in the amount of 0.6% of the suspension of filling, t, e, 140 g LST, modified with liquid glass, set to 1 m of the bulk layer. With 69% retention in the plate, 97 g remains, based on the weight of the entire plate 3.03%,

0 Fibrous carpet of the slab, at a humidity of 70%, is directed to pressing at a temperature of the heat carrier at the inlet of 190 ° C, at the exit of 200 ° C, Specific pressure of the press is 5.0 MPa when pressing 5 moisture, 0.8 MPa during drying, soaking in phase drying is carried out for 40 minutes

EXAMPLE 2, The method of manufacturing fibreboard is carried out analogously to example 1 with the difference that ceresin emulsion (0.015%) and phenol-formaldehyde resin (0.004%) are added to a suspension of 1.5%. the mass of the suspension, and the selected part of the mass is added 5 to 80 DS and at a concentration of 1.45% paraffin emulsion is added in an amount of 1.03% and 1.2% of pretreated lignosulfonates (weight by weight of absolutely dry fiber is 50%), 1.8% liquid glass at 50 ° C for 30 minutes,

Pouring finely ground mass osu-. with a dryness of the base layer 55–7%, the mass of the layer is 0.28 kg / m slab. The amount of the main layer with a mass of 3200 g / m (3.2 kg / m is 213,000 g, of a liquid layer with a mass of 1 m and 280 g / m and concentration

31361223

1.5% - 18700 g. Lignosulfonates, modified by liquid glass with the latter consumption of 1.2% of the slurry slurry, i.e. the number of years specified is 224 g. With a retention of 72%, 162 g LSTL remain in the slab, which is 5.05% of the mass of the whole plate.

PRI me R 3. Method of manufacturing fibreboard the implementation of table. 1 and 2.

As in Example 1, Table 1 shows. 1 and 2, through the spreading table, that the base layer is prepared in a visible way allows to obtain a suspension concentration of 1.6%, where quality plates with a significant amount add 0.013% of ceresin emulsion with a reduction in the consumption of phenol formal and 0.002 % FFS.15 dehydrogenous resin, which contributes

reduce wastewater pollution and

The pressing and drying of the wood carpet is carried out at a specific pressure of 5 MPa (during pressing) and g 0.8 Sha (during drying).

The processing conditions of lignosulfonates, the composition of wood-fiber plates and their quality characteristics in examples 1-4 are presented in

The cast layer is prepared with grinding 180 DS and a concentration of 1.6%, then ceresin emulsion in an amount of 0.9% and pretreated lignosulfonates in an amount of 2 about 1.9% by weight of absolutely dry fiber are added. The treatment was carried out in 2.5% liquid glass at 60 ° C for 40 minutes.

With a mass of 1 m plate, 3200 g and a concentration of 1.6%, the volume of the suspension is 200000 g. The bulk layer is 260 g / m at a concentration of 1.6% and has a volume of 1 m 16300 g.

air basin.

Formula of invention

A method of manufacturing fibreboard, including wet forming fibrous carpet made of wood fiber with a grinding degree of 25 18-20 DS, paraffin or carresin emulsion and phenol-formaldehyde resin, preparing a coating layer composition by adding lignosulfonates to the wood material. 9% per 1 m of industrial and liquid industrial liquid glass, the coating layer is 310 g. When the coating layer is held from 71.5% of the plate, 222 g remains in the slab, the composition on the fiber carpet,

those. 6.6%. Pressing and drying, different from PREMIR 4 (known). Soaking up with the fact that, in order to reduce the use of wood fiber with grinding, “neither contaminants of sewage and air 22 DS at the concentration of the fibrous basin, before adding to

mass 1.6%, temperature 60 ° C and pH 4.8

glue with the introduction of the following

components% by weight absolutely

dry fiber: ceresin emulsion

1.0; resin 1.0; sulfuric acid 0.5.

The resulting suspension is stirred

and cast on a leaf machine

at a speed of 15 m / min. On the grid

parts of the machine after the register part

the composition is sprayed.

40

45

containing%: lignosulfonate 80 (based on a 50% concentration); about liquid glass 1; dye 0,2; wood flour 2; water the rest.

wood material Technical lignosulfonates and liquid glass are mixed and the resulting mixture is held at 40-60 ° C for 20-40 minutes, while ceresin or paraffin emulsion is additionally added to the coating layer in an amount of 0.9-1.1% by weight Absolutely dry fiber and wood fiber with a grinding degree of 50-100 DS are used as a wood material, and the application of the coating layer is carried out in bulk at a moisture content of a fibrous carpet of 90-95%.

tab. 1 and 2.

The pressing and drying of the wood carpet is carried out at a specific pressure of 5 MPa (during pressing) and 0.8 Sha (during drying).

The processing conditions of lignosulfonates, the composition of wood-fiber plates and their quality characteristics in examples 1-4 are presented in

air basin.

Formula of invention

0

five

wood material Technical lignosulfonates and liquid glass are mixed and the resulting mixture is held at 40-60 ° C for 20-40 minutes, while ceresin or paraffin emulsion is additionally added to the coating layer in an amount of 0.9-1.1% by weight Absolutely dry fiber and wood fiber with a grinding degree of 50-100 DS are used as a wood material, and the application of the coating layer is carried out in bulk at a moisture content of a fibrous carpet of 90-95%.

Fibrous mass. % Ceresin emulsion,% CFF,%

Grinding, DS

Fiber wood mass (flour),%

Ceresin emulsion,% Dye,%

Set lignosulfonate in bulk composition,% by weight of the composition

Weight is 1 m of a bulk layer, kg

Humidity of a carpet of a plate when filling,%

Set liquid glass,%

The main mass of the carpet is 1.61.3

0.015 0.016

..

0,016 0,008 Bulk composition

/50

1,51,6

0,0150,0

0,0040,0

2.0

0.2

80.0

1.3 1.1

80

1.5 1.03

100

1.6

0.9

0.6 0.3

1.21.9

V

0,280,2

7590 93 95

Lignosulfonate Processing Conditions

Bending strength, kg / m 420

Water absorption

GOST 4598-86,% 12

Table 1

1,51,6

0,0150,013

0,0040,002

80

1.5 1.03

100

1.6

0.9

1.21.9

V

0,280,26

420

430

430

ten

s

1515

50

0.4 1.24

0.10 0.35

69

6, 2

m

0.0 0.1

Continued table. 2

15 72

0.21 1.1

0.01 0.1A

15 71.5

0.18 1.02

About 0.08

Claims (1)

Claim A method of manufacturing wood-fiber boards, including the wet molding of a fiber carpet of wood fiber with a degree of grinding 18-20 DS, paraffin or carasin emulsion and phenol-formaldehyde resin, preparation of a coating layer composition by adding technical and water glass lignosulfonates to the wood material, applying a coating layer of the prepared composition on a fibrous carpet, pressing and drying, characterized in that, in order to reduce pollution of wastewater and the air pool, before adding technical lignosulfonates and liquid glass are mixed to the wood material and the resulting mixture is kept at 40-60 ° C for 20-40 minutes, while a ceresin or paraffin emulsion in the amount of 0.9-1.1% of mass of absolutely dry fiber and wood fiber with a grinding degree of 50-100 DS is used as a wood material, and the coating layer is applied in bulk with a moisture content of the fiber carpet of 90-95%. Table 1 : --- * --------------------------- Low Tide and Components slabs Example Famous | ² 1 3 The bulk carpet Fibrous mass. % 1,6 1.3 1,5 1,6 Ceresin emulsion,% 0.015 0.016 0.015 0.013 FFS,% 0.016 0.008 0.004 0.002 Bulk composition Grinding, DS - fifty 80 100 Fibrous wood pulp (flour),% 2.0 1.3 1.45 1,6 Ceresin emulsion,% - 1,1 1,03 0.9 Dye,% 0.2 - - Set lignosulfonates in the bulk composition,% by weight of the composition 80.0 0.6 1,2 1.9 Weight 1 m ^{2 of the} bulk layer, kg oh s 0.28 0.26 Humidity carpet slab when filling,% 75 90 93 95 The processing conditions of lignosulfonates Set liquid glass,% by weight of lignosulfonates 1,0 1,0 1.8 2,5 Processing temperature ·· ° C - 40 fifty  60 Processing time, min - 20 thirty 40 T a b l c a 2 Fiberboard Properties Example Famous | 2 3 Bending strength, kg / m ² 420 420 430 430 Water absorption GOST 4598-86,% 12 10 9 9 Ί Continuation of the table. 2 Fiberboard Properties Example Famous .......: .....'........ ² I 3 f Swelling GOST 4598-86,% fifteen fifteen fifteen fifteen Retention of lignosulfonates,% of target fifty 69 72 71.5 In wastewater,%: phenol ' 0.4 0.23 0.21 0, 18 formaldehyde 1.24 1,1 1,1 1,02 In the air: phenol,% 0.10 0.0025 0.01 0 formaldehyde, mg / l 0.35 0.16 0.14 0.08