Timber-based material permeated with the furan polymeric compound, the method of its production and application of such a timber-based material

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 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 harvesting was impregnated with a mixture containing the polymerized organic compounds, at least, furfuryl alcohol and one additional connection. The invention relates also to a method for preparing wood impregnated furan polymer and its applications.

The level of technology

In accordance with the prior art manufacture of impregnated furan polymer wood by soaking it with a solution of furfuryl alcohol with subsequent polymerization of the specified alcohol in the internal volume of wood. As a result, in the treated zones formed dark brown drevesnoplitnye composite. The specified manufacturer of impregnated wood was carried out according to various methods described below.

1. Initiators

In the old way initiators were soluble salts, in particular zinc chloride. The salt was dissolved in water and then the solution was added to the furfuryl alcohol. Mass of salt was approximately 5% by weight of the specified alcohol. Next, this mixture was impregnated wood and polymerizable mixture using heat. When the soaking water and salt kept the wood near the surface. Consequently, furfuryl alcohol, deeper penetration into the wood, was deprived of the initiator and poorly hardened. Therefore, the application of this method was limited to short or thin pieces of wood.

In a more recent method used, the process consisting of two stages. First prepare a solution of zinc chloride in water. The wood was impregnated with this solution and dried. The amount of dried salt was approximately 5% of the calculated amount of furfuryl alcohol intended for absorption at the next stage. Then the wood was soaked furfuryl alcohol. Further it was held by drying using heat. Through this method, formed of a homogeneous material, but this required a two-stage impregnation and drying.

2. The size of the material

In the older method according to the reasons mentioned above required a thin cross-section and wood products shortened length. Under this treatment the timber of a given size had a strong gradients of color and density, and more dense and darker material were at the surfaces of treated wood. In well-treated zones near the surface (or small pieces) density values resulting from processing were lying in INTA the shaft from 0.9 to 1.15 g/cm 3. At the same time in the internal volume of the density remains the same as that of the original wood blanks, and was usually in the uncured furfuryl alcohol.

Compared with this method, the newer version had no limitations in size, but took much more time, because the drying in the first stage required caution to prevent splitting and warping.

3. The color of the material

When applying more than the old method because of the above gradient color of the material was changed in the depth direction from the surface. Therefore, the material is a lighter color, which changes color depending on the distance from the surface, were subjected to mechanical processing, including grinding. A newer method provides excellent color throughout the volume.

The closest analogue of the invention related to wood material is described in U.S. patent No. 2909450, 1959, woody material, impregnated with a composition containing furfuryl alcohol, a catalyst (e.g., cadmium nitrate, Nickel nitrate, zinc chloride, dibasic and trekhosnovnye organic acid), water, and optionally furfural. This patent also disclosed one-step method of wood treatment composition comprising these components, and the use of impregnated wood for the manufacture of products with high resistance to external influences, including alkaline reagents. However, the known method does not allow for very high uniformity of color impregnated wood material on its depth, as well as the various shades of color, and varying the content of the various components of the impregnating composition.

The invention

One of the main tasks, which is aimed at solving the present invention is to obtain wood impregnated furan polymer using at least two chemical reagents for a homogeneous impregnation solution.

Another object of the invention is to obtain uniform distribution of chemical reagents, providing the same dark color, wood, impregnated furan polymer that is uniform in color and density over the entire treated area.

The following solved by the invention the task is to obtain wood impregnated furan resin, which has superior properties, including from the point of view of decay resistance and ability to retain sizes.

According to the present invention these and other problems are solved by the creation of a product, process, as well as a new application, as set forth in the claims.

In accordance with one aspect of the present invention offers the wood material (wood) saturated furan polymer. 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 furfuryl alcohol and one additional compound selected from maleic anhydride, phthalic anhydride, maleic acid, malic acid, phthalic acid and their combinations.)

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, and this solution contains at least furfuryl alcohol and one additional compound which is selected from the group consisting of anhydrides, acids and combinations thereof. For this stage should stage drying for curing solution.

The key moments of the invention includes applying one or more chemical reagents, functioning as new initiators. The affinity towards the wood from these initiators is about the same as furfuryl alcohol, so they penetrate into the wood, remaining in solution at any depth of penetration. At any point of penetration of the solution with ranae polimerizuet. The initiators are selected from a list of all 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, 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. To prepare the treatment solution, at least one of these initiators, preferably only one, is dissolved directly in furfuryl alcohol, forming a solution which at room temperature is suitable for several months. The concentration lies in the range of from about 5% to about 20% by weight of furfuryl alcohol. At lower concentrations, the retention time is increased, and curing by heating is slower. Higher concentrations used in those cases in which there are rapid drying or drying temperature below the normal, and also when using wood containing polymerization inhibitors.

The impregnation of the wood with a solution that initiates the processing carried out by applying the so-called "full-cell process, or the process of Batalla (Bethell), usage is based processing in vacuum with subsequent application of pressure, exceeding atmospheric and lying in the range from about 98 kPa (1 ATA) to approximately 196 kPa (20 at). The initial vacuum may be maintained for a time from about 5 min to about 30 min or more, and a pressure higher than atmospheric, in the course of time from about 20 minutes to about 1 hour or more.

The curing is carried out by applying heat delivered by hot air, steam, hot oil or high-frequency heating. Heat activates the initiators and determines the start of the polymerization. Normal drying temperature may be in the range from about 70°to 140°C. the drying Process requires persistence for some time at about 90°followed by exposure for some time at 140°With or exposure for some time only at 140°C. Intervals will vary depending on size, material and type of dryer. The drying time may be in the range from about 0.5 h to about 12 h, mainly from about 0.5 hours to about 6 hours Time and the lower limit temperature processing non-critical. However, the stage of processing at elevated temperatures is a new and critical to obtain a product of good quality. When using hot air temperature with the women really equal to about 90° C. the Material is placed in a heated environment. When the temperature reaches about 90°begins exothermic reaction of polymerization. The generated reaction heat accelerates the curing, which is completed in several minutes. Then approximately 1 h the temperature was raised to 140°to remove the reaction products and the uncured monomer (uncured monomers). The final high-temperature phase after drying is the key point of the invention. In order alternatives as the maximum temperature you can use the temperature at which the firing of the wood material. When using air atmosphere having oxygen will facilitate the burning of wood. To avoid this problem, use an atmosphere free from oxygen.

The source material is the wood material, usually timber, including Board (thick lumber), but it may also be of wood composites, such as stove with oriented fibers and wood stove. You can use wood materials of any size, preferably large dimensions, in which the target material maximum length, the maximum diameter and the maximum cross-section are appropriate to estwenno 100 m, 7 m and 40 m2. Usually lumber (Board) has a maximum thickness of 50 mm, However, a more important parameter is the length, since the processing solution very quickly moves in length, but very slowly - across the cross-section. In the case of wood, capable of soaking, such as beech or birch, uniformity of processing is determined by how well impregnating solution remains homogeneous when it is moved along the length.

After impregnation of the wood material formed by the method according to the invention has uniform properties throughout the volume. Constant in the whole volume of color, resistance to moisture and damage, as well as mechanical properties. Properties and color of individual fragments of timber, treated in this way depend on the achieved download polymer. Different wood species and even different plates of the same species can be impregnated with different. Those boards who perceive a greater amount of polymer that have a darker color and greater hardness. However, the impact of the specified load resistance to moisture and damage slightly.

The moisture content of wood material can be in the range of above about 30%, and preferably exceed about 15%, but can also be below 15%. However, this is the t parameter for the wood material is not critical.

As the main use of wood material according to the invention (i.e. manufactured in the described manner) is the production of various wood products, including handles of knives, kitchen items (spoons, forks, cutting boards, rolling pins), furniture, bedroom floor, the upper parts of the shelves, construction components (cladding, eaves, external cladding, window sills, frames), parts of ships (handrails, floors, trim decks, deck flooring, furniture, fittings), coastal structures and devices (docks, piers, lobster traps), furniture for outdoors, gun boxes and revolving arms, parts of musical instruments (keyboard, piano, violin and guitar fingerboards and bridges), blinds cooling towers, containers (tanks for caustic soda or correlated products), machinery parts (plate conveyors, guides drank, the upper part of the table for sawing and planing machines).

This woody material, including cheap modification and strand material can be used for the production of valuable wood products, simulating, for example, teak, mahogany, rattan palm, etc. and to make such products new properties from the viewpoint of water resistance and a more simple and low requirements for maintenance.

Details of the proof is the following possibility of carrying out the invention

Although this description discusses the specific compositions, methods and applications, you need to keep in mind that these specific instructions should not be given a restrictive nature; they are included as examples to illustrate the best option according to the present invention.

Example

Boards of three hardwood length of approximately 1 m and a thickness of approximately 12 mm mired in a tutu and subjected to vacuum-compression to occur, applying a processing solution containing 5% of maleic anhydride and 95% furfuryl alcohol. Spent curing in the dryer using hot air at 95°C for 2 h, followed by exposure for 3 h at 140°C. At each stage of processing each pack weighed. At the end of operation calculated the level of conversion of monomer into polymer given the loss of the reaction products. Some boards after handling cut and assessed the homogeneity of their processing on the color change.

Data processing is given in the table in which the types 1, 2 and 3 wood are respectively beech, maple and birch.

andbingdeWC
6% ST. neobarb., kgThe expect. weight, kg6% SV processing., kgWeight hotwired., kgMonomial., %Polym., %Polym. Pribram., %Density, g/cm3
130,0028,3054,2448,949273981,12
230,9029,1556,3049,109368901,04
325,3623,9250,7843,2211281880,99

where

a) is the mass obtained when the moisture content (SW) 6%,

b) - the calculated weight after drying in the dryer (ST 0%),

- registered weight after impregnation (even including moisture),

g) - weight after drying, taking into account the removal of moisture due to heat,

d) - the percentage of monomer in the wood (from)), defined on the basis of the calculated mass at ST. 0%,

e) - the percentage of polymer in the wood (g)), defined on the basis of the calculated mass at ST. 0%,

W) - the percentage of monomer converted to polymer during drying,

C) be a finite density (after drying).

Maple Bereza proved similarly. They are very well saturated, but the surface was treated a little better than the internal volume, the brown color was lighter. Compared to beech, these materials had a slightly lower absorption, density and efficiency of transformation. Beech had the highest levels of uptake, transformation and density, and it was uniformly treated throughout the volume. Of the samples used, it was the best. When cutting beech showed a uniform dark color throughout the volume.

Using the new formula impregnation and schemes drying there was obtained a homogeneous drevesnoplitnye composite using beech and more or less homogeneous material using maple and birch.

For specialists in this field will understand that the compositions, methods, and applications of the present invention can be made various changes or modifications not beyond the scope of its protection. Accordingly it is envisaged that the present invention includes all such changes and modifications lying within the boundaries of the attached claims and their equivalents.

1. Saturated furan polymer woody material large size, characterized in that the saturated solution of the polymerized monomer furfuralcohol alcohol, consisting of furfuryl the new alcohol and one additional connection, dissolved directly in the specified furfuryl alcohol in order to make the processing solution, and this additional compound selected from maleic anhydride and phthalic anhydride.

2. Saturated furan polymer wood material according to claim 1, wherein the wood material is lumber.

3. Saturated furan polymer wood material according to claim 1, characterized in that the wood is a wood composite, such as stove with oriented fibers or wood stove.

4. Saturated furan polymer wood material according to claim 1, characterized in that the concentration of the specified additional connections in the specified processing solution is from about 5% to about 20% by weight of furfuryl alcohol.

5. The method of obtaining saturated furan polymer woody material large size, wherein the wood material is impregnated using a one-step impregnation with a solution of the polymerized monomer furfuralcohol alcohol, consisting of furfuryl alcohol and one additional compounds dissolved directly in the specified furfuryl alcohol in order to make the processing solution, and the specified additional the second compound selected from maleic anhydride and phthalic anhydride, and after the stage of impregnation of the hold stage of the drying process for curing solution.

6. The method according to claim 5, characterized in that the curing is carried out at a temperature in the range of from about 70 to about 140°C.

7. The method according to claim 6, characterized in that the curing is carried out at about 90°C for from about 10 min to 2 h and then at 140°C for 15 min to 4 h, or only when approximately 140°C for 15 min to 4 h, depending on the size of the material and the type dryers.

8. The use of coated furan polymer wood material obtained by the method described in any of pp.5-7, for the production of wood products, selected from the group consisting of handles of knives, kitchen goods, furniture, bedroom floor, the upper parts of the shelves, construction details, parts vessels, onshore facilities and devices, furniture for outdoors, gun boxes and revolving arms, parts of musical instruments, blinds cooling towers, containers and machine parts.



 

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2 ex, 1 tbl, 1 dwg

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