KR20130019468A

KR20130019468A - Method of preparing fire-retardant wood and fire-retardant resin impregnating wood thereof

Info

Publication number: KR20130019468A
Application number: KR1020110081429A
Authority: KR
Inventors: 박희준
Original assignee: 전북대학교산학협력단
Priority date: 2011-08-17
Filing date: 2011-08-17
Publication date: 2013-02-27

Abstract

The present invention relates to a method for producing a flame retardant wood that provides flame retardancy while maintaining the properties of natural wood by impregnating a wood impregnated flame retardant resin, and thereby a flame retardant wood.
The flame retardant wood according to the present invention can provide flame retardant performance (non-flammable, semi-non-flammable, flame retardant, flame retardant) because impregnated with a flame retardant is impregnated in the wood, and also, since the flame retardant is not coated on the surface, the empty space inside the wood It can still control temperature and humidity, and preserve the natural aroma of wood. In addition, the surface of the flame-retardant wood can be treated in various ways, such as painting or coloring according to your preference.

Description

Method for preparing fire retardant wood and flame retardant wood by this method {Method of preparing fire-retardant wood and fire-retardant resin impregnating wood

The present invention relates to a method for producing a flame retardant wood and thereby flame retardant wood. More specifically, the present invention relates to a method for producing a flame retardant wood and flame retardant wood thereby imparting flame retardancy while maintaining the properties of natural wood by impregnating the wood impregnated flame retardant resin.

Wood, plywood, medium density fiberboard, paper, etc. are widely used as furniture and building interior materials. Wood is decomposed into wood or wood gas by heating, and inflammable wood gas is oxidized, burning the building in an instant, causing damage to property and human life. Therefore, effective flame retarding and flame retarding treatment are required.

Wood-related flame retardant composition is composed of a halogen-based flame retardant, phosphorus-based flame retardant and a mixture of inorganic flame retardant and a polymer and the like is the mainstream to use the coating on the surface of the object to be coated.

Existing flame-retardant composition provides flame retardancy by forming flame-retardant coating film on the surface of wood, very low absorption of flame-retardant composition to the coated object when forming the flame-retardant coating film, the drying speed of the coating film is very slow, work efficiency is lowered, and left for a long time There is a problem that occurs when the coating film cracks.

In addition, the existing flame-retardant or flame-retardant treatment is a coating of the surface of the wood with a flame-retardant paint or flame-retardant paint after the construction of the interior wood to form a coating on the surface, one of the greatest advantages of wood, temperature control, humidity control, natural wood There has been a problem of blocking incense.

The present invention provides a method for impregnating a flame retardant in wood using vacuum pressurization.

The present invention provides a flame retardant resin that can be impregnated into wood.

The present invention provides a natural flame retardant wood in which the flame retardant is impregnated with a resin solid in the space inside the wood.

One aspect of the present invention relates to a resin for wood impregnation comprising 10 to 70 parts by weight of a water-soluble flame retardant and 1 to 10 parts by weight of water-soluble glycols based on 100 parts by weight of water.

The present invention transfers the dried wood to the vacuum pressure chamber; Injecting a resin for wood impregnation after the vacuum chamber is maintained at a reduced pressure under vacuum; Injecting the resin into wood by applying a constant pressure to the vacuum chamber into which the resin is injected; And it relates to a method for producing a flame retardant wood comprising the step of drying the resin impregnated wood.

The present invention is a flame-retardant wood impregnated with a water-soluble flame retardant, water-soluble glycols and water in the wood interior space, the flame-retardant wood is impregnated by pressurizing the composition containing the water-soluble flame retardant, water-soluble glycols and water in a vacuum chamber and the water It is formed by drying, and the water-soluble flame retardant is impregnated in a resinous solid state in the space in the wood relates to a method for producing a flame-retardant wood.

The method for producing a flame retardant wood according to the present invention impregnates a water-soluble flame retardant into a wood while flame retardant performance (non-flammable, semi-non-flammable, flame-retardant and flame-retardant) while utilizing one of the greatest advantages of wood is temperature and humidity control and natural wood fragrance. Can produce wood that meets the standards.

1 is a flowchart illustrating a method of manufacturing a flame retardant wood according to the present invention.

The present invention can all be achieved by the following description. The following description is to be understood as describing preferred embodiments of the invention, but the invention is not necessarily limited thereto.

The wood-impregnated flame retardant resin of the present invention contains water, a water-soluble flame retardant, and water-soluble glycols.

Examples of the water soluble glycols usable in the present invention include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, trimethylene glycol, propylene glycol, butanediol, pentanediol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol Etc., preferably ethylene glycol. In addition, polymer resins may also be used as the water-soluble glycols. For example, polyethylene glycol, polystyrene glycol (meth) acrylate, polystyrene glycol diacrylate, diethylene glycol diglycidi ether, polypropylene glycol (Meth) acrylates, and the like. The water-soluble glycols preferably have a molecular weight of 1,000 or less, more preferably 500 or less.

The water-soluble glycols can prevent the water-soluble flame retardant from evaporating, soften the wood, impregnate the inside of the wood to improve the dimensional stability of the wood, and also provide a function as a cryoprotectant to prevent the water-soluble flame retardant from being frozen during the winter season.

The wood impregnated flame retardant resin may include 1 to 10, preferably 1 to 3 parts by weight of the water-soluble glycols based on 100 parts by weight of water.

The water-soluble flame retardant may be used at least one of guanidine-based, boric acid-based and phosphate-based flame retardant, preferably a phosphate-based flame retardant. More specifically, water-soluble flame retardants usable in the present invention include phosphoric acid, ammonium phosphate, urea phosphate, ammonium polyphosphate, guanidine phosphate, guanidine sulfamic acid, boric acid and salts thereof, sodium borate and the like.

The wood impregnated flame retardant resin may include 10 to 100 parts by weight of water-soluble flame retardant, preferably 10 to 70 parts by weight, based on 100 parts by weight of water.

Preferably, the resin may include 5 to 25 parts by weight of phosphoric acid, 5 to 45 parts by weight of ammonium polyphosphate, and 1 to 3 parts by weight of ethylene glycol as a water-soluble flame retardant based on 100 parts by weight of water.

In addition, the wood impregnated flame retardant resin may further include 1 to 10 parts by weight of 100 parts by weight of water, such as preservatives, preservatives, colorants, fragrances as other additives.

In another aspect the present invention relates to a method for producing a flame retardant wood comprising a wood transfer step, a vacuum and resin transfer step, a resin impregnation step and a wood drying step.

Referring to Figure 1, the present invention transfers the dried wood to the vacuum chamber (S1), after maintaining the chamber in a vacuum to transfer the flame impregnated resin for wood impregnation (S2), by pressing the flame-retardant resin Impregnating the timber (S3) and a predetermined timber drying schedule (S4).

The wood transfer step (S1) is a step of transporting the dried wood to the vacuum chamber to load. In the present invention, natural wood is used to dry wood within 15% moisture content using a dryer. It is difficult to impregnate the resin inside the wood with high water content of 15% or more. Therefore, it should be dried first and then dried so that the resin can be easily impregnated into the wood voids.

After the chamber is maintained in vacuum, the wood impregnated flame retardant resin is transferred to the chamber (S2), and the vacuum chamber is decompressed to maintain the vacuum state, and the wood impregnated flame retardant resin is injected.

In the step S2, the flame retardant resin is injected after maintaining the vacuum chamber in a vacuum state. The degree of vacuum inside the vacuum chamber may be in a range lower than the normal pressure (760 mmHg).

When the inside of the vacuum chamber is in a vacuum state, the resin can be moved more quickly from the chemical tank to the vacuum chamber in the resin injection step, and a larger amount of resin can be injected into the wood.

The flame retardant resin for wood impregnation may use the flame retardant resin described above.

Injecting the flame retardant resin into the wood (S3) is a step of forcibly injecting the flame retardant resin into the wood by applying a predetermined pressure to the vacuum chamber filled with a resin. By the injection step, the flame retardant resin is present in the space inside the wood.

In general, moisture present in wood is present in empty spaces such as intracellular lumens and cell gaps or in the form of water molecules in fine pores in cell walls. Therefore, in the present invention, the space in which the flame retardant resin is impregnated represents spaces in which water was present in the wood, that is, micropores in the wood such as intracellular lumens and cell gaps.

In the impregnation step (S3), when the flame retardant resin is completely filled in the vacuum chamber, the pressure pump is operated to force the flame retardant resin into the wood.

The impregnation step (S3) in the present invention can be arbitrarily set the pressure and time according to the type of wood or the composition ratio of the resin for wood impregnation, flame retardancy, semi-combustibility, non-combustibility standards.

Looking more specifically, the pressure in the impregnation step is preferably treated at 15kg / ㎠ or more, in order to increase the productivity can be at least 20kgf / ㎠. When the pressure is 15 kg / cm 2 or less in the impregnation step, it is not only difficult to inject the flame retardant resin more than the reference amount into the wood, but also takes a long time to inject a predetermined resin injection amount.

When the wood is impregnated with the appropriate resin content, the remaining resin in the vacuum chamber is recovered by operating a pump and then the wood is transferred to the dryer.

The drying step (S4) is a step of drying the resin impregnated wood.

The drying step is a step of evaporating and removing the water present is impregnated with the resin in the wood.

During the impregnation step, the flame retardant present in the space inside the wood in the aqueous solution is filled with the wood interior space in a solid state as water evaporates by the drying step. The drying step is a step of drying the wood by controlling the temperature, humidity, and blowing in the dryer. The drying step may artificially dry the wood at low temperature below 100 degrees.

By the drying step, the water content of the resin-impregnated wood can be adjusted to 15%, preferably 12% or less.

After the drying step, as the water evaporates, components of the resin for wood impregnation (flame retardant, water-soluble glycols, other additives, etc.) are present as (resin) solids.

In the present invention, non-combustible wood is more than 120kg / ㎥, semi-combustible wood is 65kg / ㎥ or more, and flame retardant wood can reach the respective flame retardant performance standards by impregnating the resin solid content of 40kg / ㎥ or more.

That is, the resin content impregnated in the wood by the impregnation step may be more than 40kg / ㎥, the resin content may be more than 120kg / ㎥ for the manufacture of non-combustible wood.

In another aspect the invention relates to flame retardant wood. The flame retardant wood is a flame retardant wood impregnated with a water-soluble flame retardant, water-soluble glycols and water in the wood space, the flame retardant wood is impregnated by pressing the composition containing the water-soluble flame retardant, water-soluble glycols and water in a vacuum chamber It is formed by drying water, and the water-soluble flame retardant is present impregnated in the resin solid state in the space in the wood.

After the water-soluble flame retardant is impregnated into the interior space of the wood by pressure, the wood is dried to a water content of 12% or less, and the flame retardant and glycols dissolved in the water are filled in the wood interior space in a solid state.

For the composition, such as the water-soluble flame retardant may be referred to the above-described details.

The flame retardant wood according to the present invention can provide a flame retardant performance (non-flammable, semi-non-flammable, flame retardant, flame retardant) because the flame retardant is impregnated in the wood remaining, and also, since the flame retardant is not coated on the surface, the hollow inside the wood The space can still control the temperature and humidity, not only make the natural wood aroma, but also handle various paints and colors in the future.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the embodiments of the present invention can be modified in various ways, and the scope of the present invention is not limited by the embodiments.

Example One

A wooden impregnation resin of 360g of water, 90g of phosphoric acid, 150g of polyammonium phosphate, 150g of ethylene glycol, 3g of ethylene glycol, and 6g of preservatives was maintained at room temperature and vacuum of 86mmHg for 5 minutes on a cypress board having a thickness of 10mm and a width of 100mm. , 5 minutes treatment impregnated more than 240kg / ㎥.

Subsequently, the wood was dried in an artificial dryer at a water content of about 12% to prepare a non-flammable wood for flame retardant and flameproof wood that satisfies non-flammable and flameproof performance standards.

Example 2

An average of 47 kg / m 3 was impregnated with domestic larch sheet having a thickness of 10 mm and a width of 100 mm under the same conditions as in Example 1.

The impregnation amount in Example 2 corresponded to 1/6 of the cypress of Example 1 under the same conditions except wood species. In Example 2 also corresponds to the flame retardant wood 40kg / ㎥ or more, it was possible to manufacture wood in accordance with the flame retardant performance and flame retardant performance.

On the other hand, in order to manufacture a semi-non-combustible wood with the larch, when treated at least 15 minutes at the same pressure 20kgf / ㎠ at least 71kg / ㎥ is impregnated to produce a semi-non-combustible wood, to produce the larch non-combustible wood In order to achieve the impregnation amount of 120kg / ㎥ or more by pressurizing at least 90 minutes at the 20kgf / ㎠ pressure.

Example 3

Douglas fir plate 10 mm thick and 100 mm wide was impregnated with 80 kg / m3 in 5 minutes, 100 kg / m3 in 25 minutes, and 120 kg / m3 in 60 minutes. Could.

Referring to Examples 1 to 3, it can be seen that the flame retardant resin can be impregnated with a predetermined amount or more according to various conditions such as wood species, pressing force, treatment time.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

A resin for wood impregnation, comprising 10 to 70 parts by weight of a water-soluble flame retardant and 1 to 10 parts by weight of water-soluble ethylene glycol based on 100 parts by weight of water.

The resin of claim 1, wherein the water-soluble flame retardant is at least one of guanidine-based, boric acid-based, and phosphate-based flame retardants.

The method of claim 1, wherein the resin is a water-soluble flame retardant with respect to 100 parts by weight of water 5 to 25 parts by weight of phosphoric acid, 5 to 45 parts by weight of ammonium polyphosphate and 1 to 3 parts by weight of ethylene glycol for wood impregnation Suzy.

Transferring the dried wood to a vacuum chamber;
Maintaining the vacuum state by reducing the vacuum chamber and injecting a resin for wood impregnation;
Impregnating the resin with wood by applying a constant pressure to the vacuum chamber filled with the wood impregnation resin; And
Method for producing a flame retardant wood comprising the step of drying the resin impregnated wood.

The method of claim 4, wherein the dried wood in the transfer and drying steps has a water content of less than 15%.

The method of claim 4, wherein the resin for wood impregnation comprises water, a water-soluble flame retardant, and water-soluble glycols.

7. The method of claim 6, wherein the water-soluble flame retardant is at least one of guanidine-based, boric acid-based, and phosphate-based flame retardant materials.

The method of claim 4, wherein the resin for wood impregnation comprises 10 to 70 parts by weight of a water-soluble flame retardant and 1 to 10 parts by weight of water-soluble ethylene glycol based on 100 parts by weight of water.

The resin for wood impregnation according to claim 4, wherein the resin for wood impregnation comprises 5 to 25 parts by weight of phosphoric acid, 5 to 45 parts by weight of ammonium polyphosphate, and 1 to 3 parts by weight of ethylene glycol based on 100 parts by weight of water. Method for manufacturing fire retardant wood.

5. The method of claim 4, wherein the impregnation step maintains a pressurized pressure in the vacuum chamber of 15 kg / cm 2 or more.

The method of claim 4, wherein the resin content impregnated in the wood by the impregnation step is 40kg / ㎥ or more.

The method of claim 4, wherein the drying step comprises drying the wood at a low temperature of 100 degrees or less.

A flame retardant wood impregnated with a water-soluble flame retardant, water-soluble glycols and water in the wood interior voids, wherein the flame-retardant wood is impregnated by pressurizing the composition containing the water-soluble flame retardant, water-soluble glycols and water in a vacuum chamber and then drying the water A flame-retardant wood, characterized in that the water-soluble flame retardant is impregnated with a resin solid in the space in the wood.

The flame retardant wood according to claim 13, wherein the water-soluble flame retardant is at least one of guanidine-based, boric acid-based, and phosphate-based flame retardants.