Wood impregnated with furan polymer and method of wood treatment

FIELD: wood-working industry.

SUBSTANCE: described is the wood impregnated with furan polymer obtained by impregnation of wood with solution of polymerized monomer of furfural alcohol containing water, stabilizers in the form of borax and sodium salts of lignosulfone acids, furfural alcohol and at least one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, phthalic acid and their combinations. Described also is the method of wood treatment by single-stage impregnation with a solution of polymerized monomer of furfural alcohol, subsequent hardening at a temperature of 70-140C providing drying in an oven.

EFFECT: enhanced stability of dimensions in the conditions of varying moisture content, enhanced hardness and resistance to putrefaction.

11 cl, 5 tbl

 

The technical field to which the invention relates.

The present invention relates to saturated furan polymer wood that is uniform in color and density in the entire treated area. To obtain such wood original wood blank is impregnated with a solution of the polymerized monomer furfuralcohol alcohol, and the solution contains at least water, stabilizers and furfuryl alcohol, and at least one additional connection. The invention relates also to a method for preparing wood impregnated furan polymer and its applications.

The level of technology

Currently, chemical protection (protection against biodegradation) wood primarily through the use of toxic antiseptics. Most of them are toxic for organisms in the environment, including people. Even if these substances are well documented in the wood, their presence creates a problem for end use. There are two approaches that are intended for the use of chemical drugs more environmentally friendly manner, namely: (1) the use of salts, soluble in water and has low toxicity, and (2) the use of non-toxic chemicals that react with cell membranes wood and change AWT them making it less susceptible to biodegradation.

The drawback of this approach (1) is that such salts upon contact with water is usually washed out of the wood, which limits their usefulness. This method was applied compounds of boron and copper. To their advantage is the fact that some of these salts act as fire-resistant substances, and substances that slow biodegradation.

An example of approach (2) is the invention described in the previous application NO-A-20005137 owned by the same applicant (and on the basis of which filed the international application WO 0230638). This invention is based on the use of the processing compositions containing furfuryl alcohol (FA). In this invention was applied undiluted processing solution, and the timber was processed to high levels of retention of the active substances. For wood species with a specific gravity of about 0.30 (for example, pine) retention of chemical drug can reach 200% relative to the weight of dry wood. For more tight (specific gravity about 0,60, for example, maple and beech) the specified parameter can be in the region of 100%. It is shown that this level provides excellent protection against biodegradation, high dimensional stability under conditions of changing humidity and improved mechanical properties, in particular t is agosti. The main drawback of this treatment is the large number of applied chemical drug and, consequently, high cost.

Furfuryl alcohol has a high solubility in water and, therefore, easily forms with water a homogeneous solution, which can be used for impregnation of wood. Therefore impregnating solutions FS containing various amounts of water, easy to prepare. However, there are problems that need to be addressed before it will be possible to obtain suitable drevesnoplitnye composite. First, after absorption into the wood solution, to acquire useful properties must polymerization. Secondly, the polymerization must occur in both wet and dry wood. Thirdly, the polymerization should be carried out at sufficiently low temperatures.

Therefore, in order to ensure the polymerization of the Federal Assembly in the desired temperature range, wet or dry wood, it is necessary to add chemical initiators. How to initiate FS and polimerizuet it in such a temperature range, as shown in the above-mentioned patent document NO-A-20005137. However, initiated by the FS obtained by this technology are poorly miscible with water. Attempt to combine them with each other causes the separation of mixtures into two components, which cannot absorb the I in the wood a uniform manner.

Disclosure of inventions

One of the tasks, which is aimed at solving the present invention is to obtain wood impregnated furan polymer, due to changes in membrane cells of the wood by the same chemical monomer, which is described in document NO-A-20005137, but using its smaller quantities.

Another problem solved by the invention is to provide a uniform distribution of chemicals in the wood, impregnated furan polymer, with uniform color and density over the entire treated area. The solution to this problem is to be achieved through the use of water as a diluent that is beneficial to the environment and the production process. Such a diluent would get even, but low retention of the active chemical compound in the treated area of the wood.

Another problem to which the invention is directed, is to get a wood impregnated furan polymer, which would have improved properties, in particular, from the viewpoint of dimensional stability and resistance to rot.

According to the present invention these and other problems are solved by the creation of the product and method as set forth in the claims.

In accordance with one aspect of the brew is his invention serves saturated furan polymer wood. This wood is characterized by the fact that it is impregnated with a solution of the polymerized monomer furfuralcohol alcohol, and this solution contains at least water, stabilizers and furfuryl alcohol, and at least one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, malic acid, phthalic acid, and combinations thereof.

In accordance with another aspect of the invention features a method of preparation of wood impregnated furan polymer. The method is characterized by the fact that the wood is impregnated using a one-step impregnation with a solution of the polymerized monomer furfuralcohol alcohol containing at least water, stabilizers and furfuryl alcohol, and at least one additional compound which is selected from the group consisting of anhydrides, acids and combinations thereof. For this stage should stage curing.

The two key moments of the invention are: (1) use of one or more chemicals, functioning as new initiators, and (2) the use of stabilizers, which are used to initiate the conversion of the monomer into a form that is soluble in water. From the viewpoint of affinity to wood initiators such furfuryl alcohol. On the fact they are in the wood and remain in solution throughout the depth of penetration. The solution saves polimerizuet at all points of its penetration. The initiators are selected from any compounds containing anhydride, as well as from acids selected from the group consisting of maleic, malic, phthalic, and stearic acids. However, it is preferable to use a compound selected from maleic anhydride, malic anhydride, phthalic anhydride, and combinations thereof. It is preferable to use maleic anhydride, phthalic anhydride, or combinations thereof, and most preferred are maleic anhydride or phthalic anhydride. Stabilizers are borax and sodium salts of lignosulphonic acids. To prepare a processing solution, dissolved in water, at least one of the initiators, preferably only one of them, and both of the stabilizer. Then add furfuryl alcohol, forming a solution which at room temperature saves suitability for several months.

If you want to ensure impregnation on a limited surface or penetration at the end of the fiber, it is possible to apply brushing, rolling, spraying or soaking.

In the case when the required penetration depth, for easy impregnated wood can be limited only by vacuum processing. To implement deep and uniform PR is mikania there are three options:

a) pressure only (1×105-10×105PA), b) vacuum followed by pressure (the process of anticipation of wood under pressure with pre-vacuum), and C) atmospheric or low (1×105PA) pressure with a subsequent increase in pressure and, then, finally, the vacuum (the process of impregnation of the wood under pressure, without prior degassing, the so-called method of limited absorption).

For wood species with poor penetrating power, such as spruce, it is possible to apply the method of oscillating pressure.

The duration of all three processes depend on many factors, including the capacity of the equipment, the size of the wood, type of wood and the desired penetration.

Usually used method of impregnation (the process of anticipation of wood under pressure with pre-vacuum) according to the invention will depend on the desired sealing filling and looks as follows:

1) loading capacity wood and insuring cargo, preventing the floating of timber (in the case of the application of air pressure, i.e. without the use of a pumping system with hydraulic or pneumatic actuator),

2) closing of the loading door and the creation of appropriate low (partial) vacuum,

3) filling capacity processing solution

4) when agenie to submerged wood pressure lying in the interval 7×105-10×105PA and dependent on wood species and other factors; the process takes 30-60 minutes,

5) after exposure to pressure for a sufficient time, the pressure decrease up to 2×105or 3×105PA and the ousting of the processing liquid remaining pressure

6) create a complete vacuum in the working tank and keeping it for about 15 min,

7) reset vacuum and pressure increase up to 2×105PA

8) the crowding out of manufacturing a liquid selected from the cavities of the cells in stage 4),

9) complete pressure relief opening of the loading door and move-treated wood on a plot of cure.

In the area to be processed, the moisture content (SW) in the wood must be below the saturation point of the fiber (about 30% SW). What this option below, the greater the number of chemicals can be absorbed. If you want specifically noted their number, it is necessary to consider the moisture content in wood, as well as the amount of absorbed solution, and accordingly to adjust the amount of chemical processing of the drug.

Machining is a multicomponent solution. Judging from the mass of this amount of water, it may contain borax (3%), maleic anhydride (2,3%), sodium salt of lignosulfonic key is lots (5.5%) and furfuryl alcohol (30,0%).

To facilitate the addition of components such as borax, maleic anhydride and sodium salts of lignosulphonic acids, a blending operation begin heating the water to about 60°C. After complete dissolution of these solid additives in water, the solution is cooled to 20-25°With, then mix, shake it, furfuryl alcohol and store the resulting product at a temperature of 15-20°C.

Curing may occur in the temperature range from about 25°to 140°C. lower temperatures (below about 40° (C) require a long curing time (days or weeks). In the range of from about 70°C to about 100°the curing time is hours. Above 100°this period is even shorter, but this creates difficult conditions because of the rapid drying may be damage to the wood.

According to the present invention, the curing steam or hot humid air in the temperature range of about 70-100°With well-manifests itself at a fixed temperature lying in this interval. In addition, in the process of curing and drying temperature can be increased. Essentially, what we are talking about the operation of drying at ordinary temperature furnace. Good results also provide curing and drying in hot oil with temperatures from 70 to 120°as at a fixed temperature in this interest the shaft, and if you increase it within the specified interval as the processes of curing and drying. When applying a given ratio of furfuryl alcohol/initiator furfuryl alcohol is easy to cure in the specified temperature range. The material thickness of 10-20 mm will be cured within just two or three hours, but dried to the final moisture content of takes more time.

The source material is the wood material. This is usually lumber, including Board (thick lumber), but also possible and wood composites, such as stove with oriented fibers and particleboard. You can use wood materials of any size.

An important parameter of wood materials is the length, since the processing solution is moved along the length very quickly, and in cross-section very slowly. In the case of wood, capable of soaking, such as beech or birch, uniformity of processing is determined by how well impregnating solution preserves uniformity in its movement along the length. After soaking capable of soaking wood material formed by this method has uniform properties throughout the volume. Constant in the whole volume of color, resistance to moisture and porche is, as well as mechanical properties. Properties and color of individual fragments thus treated lumber depend on the progress of filling the polymer. Different wood species and even different plates of the same species can be impregnated with different. However, the effect of this filling for resistance to moisture and damage slightly.

Discuss woody material, including cheap modification and waste, can be used for the production of valuable wood products, simulating, for example, teak, mahogany, and others, as well as to give these products new properties from the viewpoint of water resistance and a more simple and low requirements for operation.

The implementation of the invention

Hereinafter the invention will be illustrated in the following examples.

To receive a combination of providing soluble in water and capable of curing the mixture with a suitable retention time, there were attempts to vary the types and amounts of initiators. After numerous tests it became apparent the following circumstances:

1. The best initiator of polymerization was maleic anhydride (MA). At the same time, this anhydride is a desirable component because, it seems, in relation to the wood he works in the quality of the ve coupling agent.

2. To maintain the homogeneity of the mixture was found to be necessary stabilizers. Otherwise, it was divided into two components, one of which settled to the bottom.

3. For the formation of a stable homogeneous mixture and maintaining it in this state, the pH should be close to neutral value.

4. To effect the curing of the pH value must be shifted into the "acid" side.

As stabilizers were tested surfactants and materials compatibility. Homogeneous mixtures, well penetrating into the wood, guaranteed borax (decahydrate of sodium tetraborate). This was the reason for choosing it as one of the best stabilizers. In some mixtures to establish uniform consistency helped a stronger buffer the impact of regulating the pH with the use of other compounds, such as sodium hydroxide. Such compounds should retain its buffer capacity up until the wood will not be saturated. In addition, it is necessary to lower the pH to facilitate curing.

Impacts contained in the mixture varying concentrations of MA-initiator and stabilizer in the form of borax on some physical properties of wood treated with their application, are presented in Table 1.

In order to provide beneficial effects, the mixture of the EAP is to be and then Tvarditsa throughout the volume of the wood with the formation of a homogeneous product. For testing homogeneity of treatment was selected Monomeric mixture containing 23.1% of FS, and 5.1% of MA and borax. The results obtained are presented in Table 2.

Concentration study showed that the solution introduced into the wood at concentrations in the range of approximately 8-39%, for impregnation increases in progressive extent of the wood, filling the polymer and the effectiveness of response to swelling. In table 3 the values of the parameters corresponding to the selected for further work concentration (31%) and the maximum concentration tested aqueous solution (39%), are mapped to the parameters of the undiluted original filesystem.

Table 3.

The ratio between the maximum values of the properties of wood (94% solution FS) and the values of these properties for the case of dilution (31% and 39% solutions).
The number in percent of the maximum value (94% solution FS)
PineBeech
% rest.SwellingThe polymer.APNSwellingPolim the R. APN
3170*)6161*)50
39685475634560
Note: * - no data.

From these results it follows that in relation to the full content of about 30% of the amount of polymer in the wood provides for a material resistant to swelling, comprising 60% to less dense wood (pine) and about 50% more dense wood (beech). Thus, from the point of view of prevention of swelling in the presence of polymer in the wood more effectively than it could be expected to do research.

Resistance to decay

The main purpose of processing wood according to this technology is to make the wood resistant to biodegradation, and in particular to rot, caused by the decomposing wood fungi. To test for resistance to decay, samples, 50 mm long with a cross-section of 15 mm to 25 mm treated with a solution with a concentration of 23.1% for FS and 5.1% for MS and for the Boers. Then the samples were subjected to the influences of various brown and white fungi according to the European Standard EN 113. The results are given in Table 4.

According to the Standard EN 113 the magnitude of the weight changes for each fungus and both variants allow sample to classify the processed wood as "highly resistant" to rot.

It was shown that the solution with a concentration of about 30% provides the wood is protected from moisture and rotting. However, improved properties also provide other concentrations. To identify intervals in which the expected beneficial effect to water solution offers the following boundary values of the percentage content of:

FSMABoraxNaOH
BottomTopBottomTopBottomTopBottomTop
290251515

Due to its high resistance to rot, wood, impregnated furan polymer in accordance with the method according to the invention, can effectively be used as constructive elements of buildings (cladding, eaves, external cladding, window sills, thresholds, frames, millwork), de is Aley vessels (handrails, sheathing, decking deck), coastal structures and devices (docks, piers, lobster traps, part dams and similar constructions), objects, outdoor furniture, decks, railings and stairs, walkways, sidewalks, equipment for playgrounds), parts of bridges (beams, railings, flooring), railroad sleeping cars, blinds cooling towers, supports, communications, heavy timber, mailboxes, poles, road facilities (racks road barriers, panels, road barriers, index rack, lighting columns and containers (cisterns, buckets, dippers).

The results showed that the addition of a second stabilizer sodium salts of lignosulfonic acids - increases the shelf life of the composition and increases the efficiency of conversion of furfuryl alcohol (see table 5).

1. Wood impregnated furan polymer obtained by impregnating wood with a solution of the polymerized monomer furfuralcohol alcohol containing water, the stabilizers in the form of borax and sodium salts of lignosulphonic acid, furfuryl alcohol and at least one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, malic acid, phthalic acid and their to the of minazi.

2. Wood according to claim 1, characterized in that the said additional compound is maleic anhydride.

3. Wood according to claim 1, characterized in that the said additional compound is phthalic anhydride.

4. Wood according to claim 1, characterized in that the said additional compound is maleic acid.

5. Wood according to claim 1, characterized in that the said additional compound is malic acid.

6. Wood according to claim 1, characterized in that the said additional compound is phthalic acid.

7. The method of processing wood by impregnating it furan polymer, including single-stage impregnation of the wood with a solution of the polymerized monomer furfuralcohol alcohol containing water, the stabilizers in the form of borax and sodium salts of lignosulphonic acid, furfuryl alcohol and at least one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, malic acid, phthalic acid and their combinations, with the subsequent stage of curing.

8. The method according to 7, characterized in that the curing is carried out at a temperature in the range of from about 70°to 140°C.

9. The method according to 8, characterized in that the curing involves drying in a furnace using normal the different temperature regimes for drying raw lumber of the same size and varieties, the impregnated material, with temperatures at the beginning of curing about 70°and in the end, about 80°With end stage additional curing between 100°120°for a material with maximum hardness and degree of drying.

10. The method according to 9, characterized in that the specified curing and drying is performed with the use of high temperature regimes of the furnace in the temperature range of 80-120°C.

11. The method according to 10, characterized in that the curing is carried out by immersing the treated material in the hot oil, preferably at 80-120°With fixed temperature or original corresponding to the lower part of the specified interval and increasing as the flow of curing and drying.



 

Same patents:

FIELD: building materials industry; production and application of the furan polymeric compound permeated timber-based materials.

SUBSTANCE: the invention is pertaining to the field of building materials industry, mainly, to production and application of the furan polymeric compound permeated timber-based materials. The

offered timber-based material is permeated with the solution of the polymerized monomer of the furfural alcohol consisting of the furfuryl alcohol and one additional compound dissolved directly in the indicated furfuryl alcohol to produce the treating solution. At that the indicated additional compound is chosen from the maleic anhydride and the phthalic anhydride. The invention also presents the method of production of the timber-based material permeated with the furan polymeric compound and the way of its application. The technical result of the invention ensures, that the timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

EFFECT: the invention ensures, that the produced timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

8 cl, 1 tbl, 1 ex

FIELD: petroleum products and antiseptic materials.

SUBSTANCE: invention is directed to protection against damage caused by fungi and bacteria, in particular to impregnation of wooden crossties and rods. Antiseptic of invention contains, as long fraction of thermal cracking, fraction of heavy pyrolysis tar boiling off within a range of 200°C to end boiling point in amount 70-95 wt % and, as color regulator, mazut fraction boiling off within a range of 220°C to end boiling point in amount 5-30 wt %.

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FIELD: building materials industry; production and application of the furan polymeric compound permeated timber-based materials.

SUBSTANCE: the invention is pertaining to the field of building materials industry, mainly, to production and application of the furan polymeric compound permeated timber-based materials. The

offered timber-based material is permeated with the solution of the polymerized monomer of the furfural alcohol consisting of the furfuryl alcohol and one additional compound dissolved directly in the indicated furfuryl alcohol to produce the treating solution. At that the indicated additional compound is chosen from the maleic anhydride and the phthalic anhydride. The invention also presents the method of production of the timber-based material permeated with the furan polymeric compound and the way of its application. The technical result of the invention ensures, that the timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

EFFECT: the invention ensures, that the produced timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

8 cl, 1 tbl, 1 ex

Wood // 2240690

FIELD: building materials industry; production and application of the furan polymeric compound permeated timber-based materials.

SUBSTANCE: the invention is pertaining to the field of building materials industry, mainly, to production and application of the furan polymeric compound permeated timber-based materials. The

offered timber-based material is permeated with the solution of the polymerized monomer of the furfural alcohol consisting of the furfuryl alcohol and one additional compound dissolved directly in the indicated furfuryl alcohol to produce the treating solution. At that the indicated additional compound is chosen from the maleic anhydride and the phthalic anhydride. The invention also presents the method of production of the timber-based material permeated with the furan polymeric compound and the way of its application. The technical result of the invention ensures, that the timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

EFFECT: the invention ensures, that the produced timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

8 cl, 1 tbl, 1 ex

The invention relates to a method of treatment of wood going into production Dec strings and stringed musical instruments (upper and lower decks of the hull violin, viola, guitar, etc), to improve the acoustic properties of the wood blanks

FIELD: building materials industry; production and application of the furan polymeric compound permeated timber-based materials.

SUBSTANCE: the invention is pertaining to the field of building materials industry, mainly, to production and application of the furan polymeric compound permeated timber-based materials. The

offered timber-based material is permeated with the solution of the polymerized monomer of the furfural alcohol consisting of the furfuryl alcohol and one additional compound dissolved directly in the indicated furfuryl alcohol to produce the treating solution. At that the indicated additional compound is chosen from the maleic anhydride and the phthalic anhydride. The invention also presents the method of production of the timber-based material permeated with the furan polymeric compound and the way of its application. The technical result of the invention ensures, that the timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

EFFECT: the invention ensures, that the produced timber-based material permeated with the furan polymeric compound is homogeneous in color and density in the whole treated zone.

8 cl, 1 tbl, 1 ex

FIELD: wood-working industry.

SUBSTANCE: described is the wood impregnated with furan polymer obtained by impregnation of wood with solution of polymerized monomer of furfural alcohol containing water, stabilizers in the form of borax and sodium salts of lignosulfone acids, furfural alcohol and at least one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, phthalic acid and their combinations. Described also is the method of wood treatment by single-stage impregnation with a solution of polymerized monomer of furfural alcohol, subsequent hardening at a temperature of 70-140C providing drying in an oven.

EFFECT: enhanced stability of dimensions in the conditions of varying moisture content, enhanced hardness and resistance to putrefaction.

11 cl, 5 tbl

FIELD: impregnation of wood.

SUBSTANCE: the suggested wood should be obtained due to impregnating wood with the mixture based upon polymerized monomer of furfuryl alcohol that contains, at least, water, furfuryl alcohol, a stabilizing additional solvent chosen out of acetone or alcohol at low boiling point such as methanol, ethanol or isopropanol and their combinations, and an initiator chosen out of maleic anhydride, phthalic anhydride, maleic acid, malic acid, phthalic acid, benzoic acid, citric acid, zinc chloride, aluminum chloride, other cyclic organic anhydrides and acids and their combinations. It has been, also, described the method for obtaining the wood impregnated with furan polymer due to a single-stage impregnation of wood with the mixture based upon polymerized monomer of furfuryl alcohol followed by hardening stage. The suggested wood is of high stability of sizes under conditions of altering moisture and increased resistance to rotting.

EFFECT: higher efficiency.

8 cl, 5 tbl

FIELD: impregnation of wood.

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EFFECT: higher efficiency.

7 cl, 2 tbl

FIELD: music.

SUBSTANCE: method for treatment of a musical instrument body comprising soundboards consists in impregnation of the instrument soundboards. During the impregnation process an assembled (finished) instrument is fixed at its ends and subjected to vibration action. The vibration is transmitted to the instrument soundboard through a string support. After beginning of the vibration action the instrument soundboard is covered inside with a composition corresponding to a rosin solution in a mixture of acetone and alcohol. The vibration action is carried out until final polymerisation of the applied composition is achieved.

EFFECT: simplification of the process of treatment of soundboards of musical instruments and improving acoustic properties thereof.

8 cl, 5 dwg

FIELD: technological processes.

SUBSTANCE: preliminary vacuumising is performed at the pressure of 0.05-0.08 MPa, as well as heating of impregnating solution and wood in the same vacuum device, submerging wood into impregnating solution, or in separate vacuum devices, then transferring impregnating solution into vacuum device with wood with preservation of vacuum, wood that is submerged into impregnating solution is maintained in vacuum, after that pressure is increased in vacuum device up to the atmospheric or excessive pressure is pulled, impregnating solution is removed, after wood maintenance it is dried, components of impregnating solution are fixed in wood with the help of fixing compound that forms thermally stable and water-insoluble substances during interaction with impregnating solution. At that processing with fixing compound is done by method of "hot and cold baths", and drying of wood is carried out until residual humidity is 20-25%.

EFFECT: improvement of physical and chemical consumer characteristics.

3 cl, 3 ex

FIELD: construction.

SUBSTANCE: method for manufacture of wood products with increased durability, stability of size and hardness of surface, which consists in the fact that non-treated wood product is impregnated with aqueous solution A) of impregnating substance selected from group that includes 1,3-bis(hydroxymethyl)-4,5-dihydroxyimidazolidinone-2, modified with C1-5-alcohol, polyol or their mixtures 1,3-bis(hydroxymethyl)-4,5-dihydroxyimidazolidinone-2, 1,3-dimethyl-4,5-dihydroxyimidazolidinone-2, dimethyl urea, bis(methoxymethyl)urea, tetramethylol-acetylene diurea, 1,3-bis(hydroxymethyl)imidazolidinone-2, methylolmethylurea or their mixtures, and B) catalyst selected from group including salts of metals or ammonia, organic or inorganic acids and their mixtures, and afterwards wood product is exposed to hardening at the temperature of 70-130C and relative air humidity from 40 to 100%.

EFFECT: exclusion of crooking and cracking of wood product.

17 cl, 4 tbl, 4 ex

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