Composition for production of a type of soft wood - fibre boards

 

(57) Abstract:

Usage: the invention can be used in the manufacture of products such as a soft wood-fiber plates in the wet wood and pulp and paper production. Goal - increase of tensile strength in bending of the products obtained, increase process efficiency by reducing consumption of wood raw materials and energy for its refining and improving the environmental friendliness of the process through the use of waste from wastewater treatment wood preparation (sludge), wood pulp and newsprint paper divisions (scop). The essence of the invention: composition for production of a type of soft fiberboard contains components in the following ratio by the EAC. dry weight, wt.%: wood fibrous mass of 16.7 - 24,3; sludge from cleaning of the circulating water wood preparation workshops 68,9 of 73.7; scop of 4.8 to 8.3; repellent of 1.7 - 2.4. After mixing the components to produce the outflow of mass on the grid of the mold, dehydrated under vacuum and optionally pressing, the resulting carpet is subjected to drying. table 1.

The invention relates to woodworking and pulp and paper production and can be is the manufacture of fiber boards, containing wt.%, sewage sludge cardboard and paper production 25-75; recycled fiber with a fiber length of not more than 0.6 mm 25-75 [1]. Get slabs have the following characteristics: a density of 0.99-1,03 g/cm3the ash content of 20.6 - 29,0% , tensile strength in bending 305 - 360 kg/cm2. However, to obtain a known composition must be recycled fiber fractionation with separation of the residue with a fiber length of not more than 0.6 mm, and formed plate is pressed at a pressure of 5 - 6 bar and dried at 150 - 160aboutWith that adds cost and complexity to the process. A composition suitable for receiving only solid slabs with low insulating properties.

The closest technical solution to the claimed composition is a composition for the production of wood-fiber soft boards containing wood fiber wood chips mixed with bark no more than 15% [2]. The plates get wet by the conventional technology. Wood chips are subjected to hot, usually a two-step grinding in grinders (hot grinding - PEM), raminator (disk mills), the resulting wood-fiber suspension is injected paraffin emulsion and the coagulant and produce ebb and pressing, sformirovana for grade M-2 and M-3 (tensile strength Flexural - the average level of 1.2 MPa and 0.5 MPa, respectively, the density of 100 - 300 kg/m3, water for 2 h is the upper bound of 34%, the conductivity of 0.05 to 0.07 W/MK, humidity upper limit of 12%).

The disadvantages of the known composition are low values of tensile strength Flexural get soft slabs marks M-2 and M-3, and low efficiency of the process for the production of plates is not less than 85% high-quality wood, on the mill which consumes large amounts of electricity and use of metal equipment. Despite the fact that the composition of the known plates includes at least 85% of the wood and in the preparation of the composition consumed large amounts of electricity soft plates brand M-1 in normal conditions do not produce.

The aim of the invention is to increase the tensile strength in bending of the products obtained type soft fiberboard, greening process through the use of waste from wastewater treatment wood preparation (sludge), wood pulp and newsprint paper (scop) departments.

This objective is achieved in that the composition for production of a type of soft wood-fiber plebisite - paraffin emulsion according to the invention includes the additional sludge from cleaning of the circulating water wood preparation workshops and scop, in the following ratio of the components, and abs. dry matter, %:

Wood-fiber - NISTO mass of 16.7-24,3

Sludge from cleaning

circulating water

wood-prepar - topitelnyh shops 68,9 of 73.7 scop of 4.8 to 8.3 Paraffin emulsion of 1.7-2.4

Scop is a small fiber from mechanical wastewater treatment wood mass and newspaper production.

Used in the proposed technical solution, the sludge is a sludge produced by mechanical cleaning of the circulating water wood preparation workshops (WPS), the main constituent of which is crushed cork.

The claimed invention is illustrated in the examples, the ratio of components in which the resulting characteristics are shown in the table.

Plates produced by next technology.

Wood fibrous mass, the degree of grinding 8-9aboutSHR flow of soft slabs shop fiberboard Petrozavodsk DSK in the ratio given in the table are mixed with the sludge from the purification of the circulating water woodyard "Kondopogakorm" and together with the same predprijatija with the degree of grinding 67-71aboutSHR. In the resulting suspension is injected paraffin emulsion in the ratio given in the table. After mixing the low tide of the mass on the grid of the mold, dehydration under vacuum, then further dewatered by pressing with a vacuum-suction, and the resulting carpet is subjected to drying. Fabricated plate has dimensions of 40 50 cm and a thickness of 16 mm (8-16 mm). The results of the test plates obtained are presented in the table.

From the table it follows that the composition for production of a type of soft slabs containing, in wt.% wood fibrous mass of 16.7-24,3, sludge from cleaning of the circulating water wood preparation workshops 68,9 of 73.7, scop of 4.8 to 8.3 and repellent of 1.7-2.4 (see examples 1-5), has a higher tensile strength in bending compared to the brand name M-1 according to GOST 4598-86, in keeping with the requirements of GOST 4598-86 to other indicators.

Thus, the claimed composition for production of a type of soft wood-fiber plates in comparison with the prototype allows to increase the tensile strength in bending at 10-35%, based on other indicators with the requirements of GOST 4598-86. Additionally, when using waste products, thereby reducing the consumption of wood raw materials for this PR is chset the environment by preventing the removal of waste in dumps and get the products, does not contain toxic substances.

COMPOSITION FOR PRODUCTION of a TYPE of SOFT WOOD-FIBRE BOARDS containing wood-fiber mass of wood chips with bark content of 6 to 14 wt. % of absolutely dry mass and water repellent - paraffin emulsion, characterized in that the composition additionally contains sludge from cleaning of the circulating water wood preparation workshops and scop in the following ratio of components (for abs. dry weight), wt.%:

Fiber weight of 16.7 - 24,3

Sludge from cleaning of the circulating water wood preparation workshops 68,9 of 73.7

Scop of 4.8 to 8.3

Paraffin emulsion of 1.7 - 2.4

 

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FIELD: wood materials.

SUBSTANCE: invention relates to a method for protection of wood providing to confer its hydrophobic properties for enhancing its longevity and stability of sizes. Invention describes a method for chemical treatment of lignocellulose materials, in particular, a wood lump. Indicated material is impregnated with a chemical agent containing hydrocarbon chains and this agent is chosen from mixed anhydrides containing the first hydrocarbon chain R and the second hydrocarbon chain R1 wherein R or R1 represents (C2-C4)-carboxylic acid, and R1 and R represents saturated or unsaturated (C6-C24)-fatty acid with exception mixed anhydride of acetic/benzoic acid. Indicated agent is useful for carrying out grafting based on a covalent bond in a great number of hydrocarbon chains with indicated materials. Grafting is carried out by the esterification reaction of indicated lignocellulose materials using a chemical agent chosen from organic anhydrides. Impregnation is carried out in the presence of a basic, neutral or weak acid catalyst and in the absence of catalyst also by immersion and irrigation in autoclave. Treatment is carried out at temperature from room value to 150°C but preferably from 100°C to 140°C. Also, invention describes an article based on lignocellulose fibers material, in particular, wood lump prepared by above described method. Proposed method provides preparing lignocellulose material, in particular, a wood lump with uniform fibers and smooth shape showing the absorption coefficient 3.5% and the swelling coefficient 3.5%.

EFFECT: improved method of treatment.

16 cl, 3 dwg, 3 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: invention relates to use of alkoxylated amines to treat wood in order to improve water-repellent properties of wood or reduce the amount of water absorbed by wood. Treatment is carried out with alkoxylated amines of formula where R1 denotes C8-20-alkyl; R2 denotes -[CH2CH(X)O]bH (a-1) or n is an integer from 1 to 4; each of a, b and c independently denotes an integer ranging from 1 to 20; each X is independently selected from a group comprising hydrogen, methyl, ethyl and phenyl. Alkoxylated amines of formula (I), particularly N,N',N' -tris(2-hydroxyethyl)-N-cocoalkyl-1,3-diaminopropane or N,N',N'-tris(2-hydroxyethyl)-N-tall alkyl-1,3-diaminopropane can be used in the composition for treating wood in amount of 0.1-90 wt %.

EFFECT: use of alkoxylated amines of formula (I) to treat wood improves water-repellent properties of wood and reduces the amount of water absorbed by wood.

10 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to antiseptic agents for treating wood and specifically to antiseptics based on water-soluble polymers. The antiseptic consists of a mixture of dry salts and acids, with the following ratio in wt %: partial zinc salt of a polyacrylic acid 1.88-2.5; sodium salicylate 37.88-38.25; salicylic acid 20.25-25.18; citric acid 34.07-39.99, soluble in 50% aqueous solution of a quaternary ammonium salt of formula [R(CH3)2(CH2C6H5)N]+Cl-, R=C10H21-C18H37, with the following ratio of components in wt %: mixture of dry compounds 25; aqueous solution of quaternary ammonium salt 75. Working solutions with concentration of 2.0 wt % and 0.5 wt % are prepared from the obtained antiseptic solution.

EFFECT: antiseptic is more effective in treating wood compared to its counterparts.

2 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to wax dispersions in form of nanoparticles, used for hydrophobisation of lignocellulose- and/or cellulose-based materials. The wax dispersion contains water as a continuous phase, an emulsifying agent and wax which forms the dispersed phase. More than 85 wt % of the wax is made up of one or more long-chain hydrocarbons containing more than 20 carbon atoms on average, and the wax has hardening temperature ranging from higher than 40 to 150C. The dispersed wax in form of solid particles has mean particle diameter from 10 to less than 500 nm. The wax dispersion is obtained by heating a mixture containing water, an emulsifying agent and wax to temperature higher than the melting point of the wax, and the molten wax is emulsified using a dispersant and then cooling to temperature lower than the hardening temperature of the dispersed wax phase. Hydrophobisation of materials is carried out by bringing said materials into contact with said wax dispersion and then pressing the material.

EFFECT: obtained wax dispersions contain a large weight ratio of a dispersed wax phase, are stable during storage and are resistant to shearing stress, provide a high hydrophobic effect compared to standard wax dispersions with the same content of wax.

23 cl, 3 tbl, 6 ex

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