Composition for production of a type of soft fiberboard
(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. The essence of the invention: composition for production of a type of soft fiberboard contains components in the following ratio, wt. % : scop of 7.8 to 12.0; sludge from cleaning of the circulating water drevesnostruzhechnogo Department of 68.7 - 78,6; sawdust fractions of manee 5 mm 11.8 to 17.7; repellent 1,6 - 2,2. 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 used in the manufacture of products such as a soft fiberboard.Known composition for the manufacture of fibrous plates containing scop, representing the sediment after physico-mechanical treatment of wastewater from pulp and paper industry. Produce outflow mass and dehydration, and then perform hot pressing. 10-18 mm, the tensile strength in bending to not less than 5.0 to 8.0 MPa, water absorption for 2 hours and not more than 30% , moisture not more than 12% . However, the production of these plates requires expensive equipment (multi-storey hot hydraulic press), with the resulting plates are not used as insulating materials because of their higher density.Known composition for the manufacture of wood-fiber plates containing crushed chips and flattened sawdust, pre-treated with an aqueous solution of ammonia at a ratio of 1: 120. In the fibrous mass is injected binder, such as albumen glue in the amount of 1% , or phenol-formaldehyde resin in the amount of 1,5-2% by weight of the absolutely dry fiber, glue the weight of a paraffin wax emulsion with the consumption of paraffin 1% by weight of the absolutely dry fiber, and as a precipitator use 2% sulfuric acid. Then produce a molded carpet on the casting machine, molded carpet is subjected to pressing by the press at 180-200aboutC for 6-8 minutes Slabs subjected to heat treatment at 160aboutC for 2-4 hours Get slabs have the following characteristics: bending strength 271-701 kg/cm2, water for 24 h 14-37,8, swelling of 7.6 is 34.0% .
Complex multi-stage technology using a variety of chemicals, as well as a large consumption of energy causing high cost products.The known composition of the paste for the manufacture of fiberboard from waste pulp and paper production, containing, by weight. % : scop 70-90 and sawdust 10-30. Reflux was carried out in laboratory conditions on a vacuum-forming machine to form dimensions 20x20 see Cold pressing plates produced on the hand pump to a moisture content of 70% . Hot pressing was carried out in a hot hydraulic press "ihom" at a temperature of 160-170aboutWith a pressure of 1.5 MPa for 90-100 minutes of Physical-mechanical properties of samples of the plates was determined according to GOST 19592-80. The plates had the following characteristics: density 629-665 kg/m3; tensile strength Flexural 3.9 to 5.0 MPa, water absorption of 5.2 to 7.0% .However, the resulting plates belong to the semi-solid grades, and, therefore, they cannot be used in sa for a long time leads to increased consumption of energy, that significantly increases their cost.Research current level of technology in the field of patent and scientific and technical information sources showed that the scop and sawdust in the production of soft plates were not used.The closest technical solution to the claimed composition on the physicomechanical properties and applied technology is a composition for the production of wood-fiber soft plates containing fibre mass of wood chips mixed with bark no more than 15% . The plates get wet by the conventional technology. Wood chips are subjected to hot, usually a two-step grinding in grinders (hot grinding - PEM), refiners (disk mills), the resulting fiber suspension is injected paraffin emulsion and the coagulant and produce ebb and extrusion, molded cloth plate is dried. The obtained fiber soft plates meet the requirements of GOST 4598-86.Plate for brand M-1 have the following characteristics: tensile strength Flexural - average of 2.0 MPa, the density of 300-400 kg/m3, water for 2 h is the upper bound of 34% , thermal conductivity of 0.0 the value of tensile strength Flexural get soft slabs marks M-1, as well as the low efficiency of the process, so as to produce plates used chips containing not less than 85% of the wood on the mill which consumes large amounts of electricity and use of metal equipment.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 drevesnoplitochnykh (sludge), drivesnapshot and newsprint paper (scop) departments, as well as the use of sawdust from sawing and felling balance on the chips. In addition, the production efficiency by eliminating costly and energy-intensive equipment for stock preparation.This objective is achieved in that the composition for production of a type of soft wood-fiber plates containing fibre mass and repellent - paraffin emulsion according to the invention, comprises a fibrous mass scop, sludge from cleaning of the circulating water drevesnostruzhechnogo Department and sawdust fraction less than 5 mm in the following ratio of components (for abs. dry weight) wt. % : Scop 7 Repellent 1,6-2,2
Used in the proposed technical solution, the sludge is a sludge produced by mechanical cleaning of the circulating water drevesnoplitochnykh shops (DPD), the main component of which is crushed cork.Used as a wood-fiber mass scop is a fiber from mechanical wastewater treatment drivesnapshot and newspaper production.Used in the inventive composition get sawdust when cutting and felling balance on the chips. In the proposed composition of the used sawdust fraction of less than 5 mmThe proposed components for mass production type soft fiberboard allows to obtain products with high tensile strength - the tensile strength in bending above the average for grade M-1.The invention is illustrated by the 12 examples, the ratio of components in which the resulting characteristics are shown in the table.The plates produce on the following technology.Scop derived from the mechanical treatment of wastewater drivesnapshot and newspaper production ON "Kondopogakorm", mixed with the sludge produced during mehanizirovannoju on a sieve with the hole diameter of 5 mm, in the ratios shown in the table. Later in the suspension is injected paraffin (paraffin wax) in the amount indicated in the table. All are thoroughly mixed, followed by reflux of the mass on the grid of the mold, dehydrated under vacuum, then further dewatered by pressing under vacuum suction. After removing the pressure, and disconnect the vacuum wet plate, removed from the mold, is subjected to drying. Plates have dimensions of 40 × 50 cm and thickness 8-16 mm Plates have GOST 19592-80, the results are given in the table.From the table it follows that the composition for production of a type of soft slabs containing components in the following amounts, by weight. % : scop of 7.8 to 12.0; sludge from cleaning of the circulating water drevesnostruzhechnogo Department of 68.7-78,6; sawdust fraction less than 5 mm 11.8 to 17.7 and repellent 1,6-2,2, has a higher (of 2.20 to 2.35 MPa) tensile strength in bending, compared with an average value of the index mark M-1 according to GOST 4598-86 under other properties to the requirements of the specified Standards (see examples 1-4 of table).Thus, the proposed composition for the production of articles such soft fiberboard, compared with the prototype, allows polysilicate not from a special fibre mass (prototype), and of waste, much of which does not contain the fibrous elements and which are still disposed of in dumps or partially burned. The composition of the paste does not contain toxic substances, which consequently improves the ecological situation not only in nature, but in the room where you will get used plates, eliminating harmful effects on humans.(56) Steingel I. A. Use of osprey in the production of fibre boards//Scientific-technical abstract collection VNIPI-Lesprom, 1983, vol. 8, S. 14-15.USSR author's certificate N 1008327, class D 21 J 3/00, 1983.Katina E. C. , Gavrilidis E. A. , Axelrod, H. Fibrous plates from waste pulp and paper production. - Sat. the scientific. proceedings of VNIIM New in the production of paper, cardboard and Board. Leningrad, 1988, S. 76-82.GOST 4598-86 "fiberboard". COMPOSITION FOR PRODUCTION of a TYPE of SOFT wood-FIBER PLATES containing fibre mass and repellent - paraffin emulsion, characterized in that the composition contains as wood pulp scop, sludge from cleaning of the circulating water drevesnostruzhechnogo production and sawdust fraction of less than 5 mm in the following someeventhandler Department of 68.7 - 78,6
Sawdust fraction less than 5 mm 11.8 to 17.7
Repellent 1,6 - 2,2
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
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
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
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 150°C. 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
SUBSTANCE: composition includes, at least, two components a and b. Component a) contains, at least, one mono- and/or multifunctional thiol. Component b) contains, at least, one mono- and/or multifunctional -ene. The molar ratio between the thiol and -ene groups constitutes from 1:0.9 to 1:10. Also described are: element of soaked wood; method of soaking the wooden element, including soaking wood with the said composition with further hardening.
EFFECT: increased water resistance and improved mechanical properties of wood.
13 cl, 10 tbl, 10 ex
FIELD: wood-working industry; production of pressed building items.
SUBSTANCE: the group of inventions is pertinent to the field of production of pressed building items made out of plant roughage and may be used in wood-working construction industries and other branches of economy. The panel made by pressing out of a carpet without synthetic binding materials consists of a mixture of a birchen bark ground up to a faction of 40-5000 microns and a filler predominantly out of cellulose filaments at the following ratios in respect to the total dry solid matter (in mass %): a birchen bark - 60-95, cellulose filaments - 5-40. In an alternative version of the panel, which is made the same way as the above, the outer surfaces of the carpet are strengthened with lingo-cellulose-polymeric compound including an excelsior and the KF-EC resin with a hardener or an excelsior and triturated secondary polymer taken in amount of 10-12 mass % to the weight of the excelsior. At that the share of the lingo-cellulose-polymeric compound makes 20-40 % to the total dry weight of the carpet. The method allows to use a ground birchen bark without synthetic binding agents for shaping a carpet and its consequent pressing. At that for a carpet formation they use the birchen bark ground up to a faction of 40-5000 microns, and a filler mainly made out of cellulose filaments taken in the following ratio in respect to the total dry weight(in mass %): a birchen bark-60-95, cellulose filaments - 5-40. Before formation of the carpet the filler is moistened up to 18-20 % of absolute humidity and is mixed with ground birchen bark. The carpet is formed with a thickness equal to 200-300 % of the thickness of a finished panel. The group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.
EFFECT: group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.
8 cl, 1 tbl
FIELD: woodworking industry, in particular composition for soft groundwood board.
SUBSTANCE: claimed composition contains (mass %): wood fiber 86.7-92.5; fiber-containing precipitate 9.6-3.8; paraffin emulsion 2.5; and sulfuric acid 1.2; wherein ratio of wood fiber and fiber-containing precipitate is 90-96:10-4, respectively. Fiber-containing precipitate used as wood raw material represents waste from wet method for production of soft groundwood board and sulfate method for production of cellulose.
EFFECT: method for production of soft groundwood board with reduced prime wood mass consumption without deterioration of characteristics.
2 tbl, 1 ex
FIELD: manufacture of substantially flat articles, for instance particle boards and other articles of industrial wood residue or vegetable raw materials by hot pressing thereof.
SUBSTANCE: method for particle board production involves performing hot molding at temperature of 120-200°C and under pressure of 2.5 - 30.0 MPa for panel forming. Industrial waste, molasses, concentrated corn steep or mixture thereof are used as binding material, wherein lime and starch-containing materials are added to mixture including industrial wood residue or vegetable raw materials and the binding material before hot molding operation beginning.
EFFECT: increased ecological safety and increased strength of the panels.
4 cl, 1 tbl, 1 ex
FIELD: construction materials industry; production of the composite materials used in production of wood pressing masses.
SUBSTANCE: the invention is pertaining to production of the wood pressing masses exclusively on the basis of the fragments of the vegetable origin, in particular, to the molding compound for manufacture of the composite materials. The invention presents the molding compound containing fragments of the lignocellulose material containing cellulose, lignin, hemicelluloses, free sugars produced from of the hydrocarbonic part of the vegetable material at its steam treatment and differing by the fact, that the lignocellulose material before steam treatment at the room temperature is subjected to steeping by the pure water within 20-120 minutes, which is taken in the ratio of 1 mass share of water to l mass share of the lignocellulose material. The technical result of the invention - preliminary steeping allows to reduce the temperature and the steam treatment duration, which leads to reduction of the power consumption and to the increase of productivity.
EFFECT: the invention allows to reduce the temperature and duration of the lignocellulose material steam treatment, ensures reduction of power consumption and increase of productivity.
1 tbl, 1 ex
SUBSTANCE: fibrous plate contains base, consisting of at least 30 wt % vegetative fibres; substance absorbing and decomposing aldehydes, impregnating, with its further hardening, near-surface area of base from both sides, and which contains at least carbodihydroside. Said substance can impregnate only one base side. Carbodihydroside is applied on base by sputtering in form of water solution together with surface active substance.
EFFECT: obtaining fibrous plate with property of simultaneous absorbing and decomposing both formaldehyde and acetaldehyde.
13 cl, 3 dwg, 6 tbl, 3 ex
FIELD: process engineering.
SUBSTANCE: proposed method comprises gluing wooden shavings or fibers together. Note here that prior to gluing, wood is subjected to treatment by bisulphate in atmosphere saturated with steam, or in air saturated with steam for 3 to 8 minutes at 6 to 12 bar. In using formaldehyde-resin binders, articles with extremely lows evaporation of chemicals can be produced that feature relatively light colour.
EFFECT: reduced degree of evaporation.
8 cl, 1 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: invention relates to production of composited materials from lignocellulose raw and can be used in construction and furniture production. Proposed method comprises grinding raw material, drying, processing by steam at higher temperature and pressure during time interval sufficient for decomposition of hemicelluloses followed by elevated-temperature compaction. The latter allows thermal hardening of hemicelluloses decomposition products to produce polymer matter that makes a binder for lignocellulose material. Grinding lignocellulose raw material, represented by wheat straw or aspen wood, is performed to 0.2 mm-size, steam processing is carried out at 170 to 190°C. Note here that, prior to elevated-temperature compaction, 5 to 30% by weight of total dry weight of filler are added selected from the group of electrically conducting or coloring material, e.g. natural graphite, aluminium powder.
EFFECT: simplified method of producing composite materials, improved properies.
2 cl, 1 tbl, 12 ex
FIELD: construction industry.
SUBSTANCE: invention refers to wood-working, furniture and construction industry. In order to develop non-toxic plate material, it is proposed to use moulding material from plant raw material without using synthetic binders. Moulding material in the form of plant raw material particles containing cellulose, lignine, easy- and difficult-to-hydrolyse polysaccharides and carboxyl groups is obtained by means of cavitation treatment of plant raw material; at that, it contains easy- and difficult-to-hydrolyse polysaccharides 13-18% and 28-37%, correspondingly, cellulose with copper index of 1.7-2.9 g/100 g - 53-58 %, lignine (Komarov) 31-37% and carboxyl groups 0.6-4.9 %.
EFFECT: cheap plate materials having high ecological and physic and mechanical properties are obtained from moulding material.
6 cl, 1 ex, 5 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to production of plate materials based on cellulose-containing particles impregnated with glue base on carbamide-formaldehyde resin to be used woodworking industry. Cellulose-containing particles are mixed with glue based on carbamide-formaldehyde resin and acid solidifier. Said cellulose-containing particles represent flax boon. Note here that said glue comprises additionally modifier butanol-1 in amount of 1.4…1.6% of carbamide-formaldehyde resin weight.
EFFECT: production of new structural material with increased physical and mechanical properties.
1 cl, 2 tbl, 2 dwg
FIELD: wood industry.
SUBSTANCE: invention may be used to extract, recycle and process wood wastes in process of fibreboards production. The method includes supplying waste waters downstream pouring-forming machine into an accumulating-balancing reservoir, its pumping along a bypass pipeline into a disperser with simultaneous air supply from atmosphere into the bypass pipeline, formation of air and water mixture passing through the disperser, supply of air and water mixture into a dynamic absorber to create floating complexes, their supply into a receiving chamber of a flotation plant, separation into foam sent to the pouring-forming machine and treated water supplied to the accumulator. The system for method realisation comprises an accumulating-balancing reservoir for collection of waste waters, a bypass pipeline and a disperser to create air and water mixture, a dynamic absorber to form floating complexes, a floatation plant with a receiving chamber, a foam-producing mechanism and a foam-collecting pocket to separate caught fibre in the form of foam and an accumulator of treated water.
EFFECT: inventions ensure simple and cheap technology for extraction, recycling and processing of internal fibreboard production wastes with the possibility of secondary wood fibre catching and return directly into the process cycle without its additional treatment.
2 cl, 1 dwg, 2 tbl, 1 ex