CN112440347B

CN112440347B - Nano-magnesium board processing technology and flame-retardant dipping device

Info

Publication number: CN112440347B
Application number: CN202011339288.7A
Authority: CN
Inventors: 方朝国; 朱莽; 杨明; 李冲; 化明志; 张琪坤
Original assignee: Shandong Enjoy Advanced Material Co ltd
Current assignee: Shandong Enjoy Advanced Material Co ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-03-11
Anticipated expiration: 2040-11-25
Also published as: CN112440347A

Abstract

The invention discloses a processing technology of a nano magnesium board, which comprises the following steps of processing dried wood into a milled powder with a preset specification; adding a P-N flame retardant into the ground powder for impregnation treatment; pressing and molding the dipped ground powder into a nano magnesium board base material; the preparation method comprises the following steps of sequentially superposing wear-resistant paper, decorative paper, a magnesium containing plate substrate and balance paper, and carrying out hot press molding to obtain a molded magnesium containing plate, and also discloses a flame-retardant impregnating device which comprises a pressure-resistant treatment tank, wherein a powder impregnating box for separately storing ground powder is arranged in the pressure-resistant treatment tank, the powder impregnating box is provided with dense flame retardant permeation holes for P-N flame retardant to circulate, and a power mechanism for driving the powder impregnating box to bounce up and down is arranged in the pressure-resistant treatment tank.

Description

Nano-magnesium board processing technology and flame-retardant dipping device

Technical Field

The invention relates to the technical field of floor processing, in particular to a nano magnesium board processing technology and a flame-retardant dipping device.

Background

The flame-retardant floor refers to a wood floor with fireproof and flame-retardant functions. In the production process, the fireproof and flame-retardant floor generally takes fiber boards, shaving boards, plywood and the like as base materials, the base materials are soaked in a flame retardant, and a certain flame retardant grade is achieved through flame retardant treatment. The flame retardant mechanism of magnesium hydroxide as a common flame retardant is as follows: when magnesium hydroxide is decomposed by heat, H2O is released while absorbing a large amount of latent heat, which lowers the temperature to which the resin is actually subjected in a flame, having a cooling effect of suppressing the decomposition of high polymers and the generation of combustible gases. Meanwhile, MgO generated after decomposition is a good refractory material, which can also help to improve the flame resistance of the resin, and the hydrogen and oxygenThe thermal decomposition temperature of the magnesium oxide is as high as 340 ℃, so the flame retardant property of the magnesium oxide is very excellent. However, the main disadvantages of using common magnesium hydroxide for flame retardation of polymers are low flame retardation efficiency and poor compatibility with a matrix, and the flame retardation performance of the material is required to meet a certain requirement, and the addition amount of the magnesium hydroxide is usually as high as more than 50%, so that the mechanical property and the processing property of the material are greatly influenced, and the use requirement is difficult to meet; research shows that nano Mg (OH) is adopted₂The flame retardant property of the plastic is better than that of common Mg (OH)₂The filled plastic has better machinability, compared with organic flame retardant containing phosphorus and halogen, the nano magnesium hydroxide is nontoxic and tasteless, has triple functions of flame retardance, filling and smoke suppression, is an ideal additive for developing flame retardant polymers, and has been widely paid attention to by people

For the production process of wood flame-retardant dipping treatment, at present, a plate is generally placed in a pool with novel wood flame-retardant modification liquid for flat soaking, the pool is kept at a water temperature, then the plate is taken out and dried, finally the plate is placed in a drying chamber, and after the room temperature is reduced, the plate is taken out.

Disclosure of Invention

The invention aims to provide a nano magnesium board processing technology and a flame-retardant impregnation device, and aims to solve the technical problem that in the prior art, the impregnation amount of a flame retardant is low and the flame retardant is only suitable for treating wood with low thickness such as veneers and the like due to the fact that the wood is directly placed in impregnation liquid for soaking.

In order to solve the technical problems, the invention specifically provides the following technical scheme:

a process for processing a nano-magnesium plate comprises the following steps,

step 100, drying the wood raw material, and processing the dried wood into ground powder with a preset specification;

200, adding a P-N flame retardant into the ground powder material to perform impregnation treatment on the ground powder material;

step 300, uniformly stirring the dipped ground powder and auxiliary materials, pressing and forming, and crystallizing and solidifying to condense into a nano magnesium board substrate;

and step 400, sequentially overlapping the wear-resistant paper, the decorative paper, the magnesium containing plate base material and the balance paper, and performing hot press molding to obtain a molded magnesium containing plate.

In step 200, the method of the dipping treatment includes:

step 201, placing the milled powder in a vacuum tank, and starting a vacuumizing device to enable the interior of the vacuum tank to form a negative pressure state so as to pump out air remained in the milled powder;

202, injecting a P-N flame retardant into the vacuum tank in a negative pressure state, removing the negative pressure state of the vacuum tank, and pressurizing the vacuum tank to enable the P-N flame retardant to be pressed and mixed in the grinding powder in the pressurized state;

step 203, releasing the pressure of the vacuum tank, and releasing redundant P-N flame retardant from the vacuum tank in a filtering mode;

step 204, enabling the interior of the vacuum tank to form a negative pressure state through the vacuumizing device again so that all the P-N flame retardant adsorbed on the surface of the ground powder enters the ground powder;

and step 205, finally, releasing the pressure of the vacuum tank again, and taking out the milled powder from the vacuum tank for drying treatment.

In step 202, the grinding powder is separately stored and isolated from the P-N flame retardant, the pressurization is intermittent, the grinding powder is in a bouncing state by applying pressure to and maintaining the pressure of the vacuum tank in a reciprocating manner, and the grinding powder is switched between a collision state and a separation state with the P-N flame retardant in the bouncing process, so that the grinding powder with high P-N flame retardant impregnation amount is obtained.

In step 202, a method of obtaining a high P-N fire retardant impregnation amount of abrasive powder comprises:

step 2021, pressurizing the vacuum tank, wherein the grinding powder moves towards the direction close to the P-N flame retardant and contacts the flame retardant so that the P-N flame retardant is pressed into the grinding powder under the pressurized state;

step 2022, stopping pressurizing the vacuum tank, keeping the pressure in the vacuum tank unchanged, moving the grinding powder material in a direction away from the P-N flame retardant, and throwing the P-N flame retardant which is not absorbed by the surface of the grinding powder material and air in the ground powder material out in the moving process;

step 2023, continuing to pressurize the vacuum tank, wherein the abrasive powder moves towards the direction close to the P-N flame retardant again and contacts the flame retardant, so that air gaps released from the interior of the abrasive powder absorb the P-N flame retardant again;

2024, repeating the steps 2022 and 2023 for several times until the preset pressure value of the vacuum tank is reached, and repeatedly pressurizing and maintaining the pressure of the vacuum tank to make the abrasive powder continuously release the air occupied space inside the vacuum tank and fully absorb the P-N fire retardant.

Before step 201, preheating the milled powder before adding into the vacuum tank, and adding the preheated milled powder into the vacuum tank while it is hot.

In order to solve the above technical problems, the present invention further provides the following technical solutions:

the flame-retardant impregnating device comprises a pressure-resistant treatment tank connected with a pressurization air pump and a vacuumizing device, wherein a liquid adding opening used for adding a P-N flame retardant and a releasing opening used for releasing the P-N flame retardant are formed in the pressure-resistant treatment tank, a powder impregnating box used for storing grinding powder independently is arranged inside the pressure-resistant treatment tank, the P-N flame retardant is added into the pressure-resistant treatment tank along the liquid adding opening, flame retardant penetrating holes for the P-N flame retardant to circulate are formed in the powder impregnating box in an intensive mode, and a power mechanism used for driving the powder impregnating box to bounce up and down is arranged inside the pressure-resistant treatment tank so as to achieve contact and separation of the grinding powder and the P-N flame retardant in the powder impregnating box.

As a preferable scheme of the invention, the power mechanism comprises a driving part for intermittently applying a pushing force to the powder impregnation box and a driven part which is connected with the powder impregnation box and drives the powder impregnation box to move up and down under the action of the intermittent pushing force.

As a preferable scheme of the present invention, the driving member includes an air injection pipe disposed in the pressure-resistant treatment tank and located right above the powder impregnation box, the air injection pipe is provided with a plurality of air injection ports, an air outlet pipe of the pressurization air pump penetrates through an outer wall of the pressure-resistant treatment tank and is connected to an air inlet end of the air injection pipe for intermittently supplying air to the air injection pipe, an automatic opening and closing member is disposed in the air injection pipe to make opening and closing of the air injection ports consistent with opening and closing of the pressurization air pump, the driven member is a spring, one end of the spring is connected to the bottom of the powder impregnation box, and the other end of the spring is connected to the bottom of the pressure-resistant treatment tank.

As a preferable aspect of the present invention, the automatic opening and closing member includes a plurality of plugs that are disposed outside the air nozzle and correspond to the air nozzles one to one, a plurality of extension springs are disposed inside the air nozzle, one end of each extension spring is connected to an inner wall of the air nozzle, and the other end of each air nozzle is connected to the plug.

As a preferable scheme of the invention, one surface of the plug facing the air nozzle is protruded to form a conical plug part matched with the air nozzle, a cross-shaped clamp connected with the conical plug part is arranged in the air nozzle, and the cross-shaped clamp is connected with the telescopic spring to avoid an overlarge opening of the air nozzle.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, P-N flame-retardant impregnation treatment is directly carried out on wood flour, and a board with a fireproof flame-retardant effect is formed after high-pressure pressing, crystallization and solidification after impregnation, wherein the board is directly impregnated with a flame retardant different from a traditional flame-retardant floor, the impregnation permeability of the wood flour in a particle level is high, and compared with the method of directly coating the surface of the floor or impregnating the whole board, the impregnation amount of the flame retardant is large, and the fireproof level is high;

(2) the flame retardant impregnating tank is used for impregnating the ground powder with the flame retardant, the power mechanism drives the powder impregnating box for independently storing the ground powder to bounce up and down so as to enable the ground powder to be in reciprocating contact with and separated from the flame retardant in the pressure-resistant treatment tank, when the ground powder is in contact with the P-N flame retardant, the P-N flame retardant is pressed into the ground powder in a pressurized state, and when the ground powder is separated from the P-N flame retardant, the P-N flame retardant which is not absorbed on the surface of the ground powder is thrown out of the ground powder in the movement process, and air in the ground powder is convenient to be better absorbed when the ground powder is in contact with the P-N flame retardant next time, so that the impregnating amount of the P-N flame retardant in the ground powder is increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a flow chart of a process for processing a magnesium nano-plate according to an embodiment of the present invention;

FIG. 2 is a block diagram of a flame retardant impregnation apparatus provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a plug according to an embodiment of the present invention.

The reference numerals in the drawings denote the following, respectively:

10-pressure resistant treatment tank; 20-an air pump; 30-a vacuum pump; 40-powder impregnation box; 50-a pneumatic element;

11-a liquid filling port; 12-a release port; 13-a heat-insulating layer; 14-an interlayer; 15-heating medium inlet; 16-an outlet;

41-a spring; 42-a box body; 43-box cover;

51-a gas nozzle; 52-gas jet; 53-occlusion; 54-a conical plug portion; 55-a telescoping spring; 56-cross card.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in FIG. 1, the invention provides a process for processing a nano-magnesium plate, which comprises the following steps,

step 400, overlapping the wear-resistant paper, the decorative paper, the magnesium containing plate base material and the balance paper in sequence, and performing hot press molding to obtain a molded magnesium containing plate, wherein the hot press temperature is about 130-195 ℃, the plate surface pressure is about 3.6Mpa, the hot press time is 30-500 seconds, the cold press time is 100-300 seconds, and the specific parameters are adjusted according to different products.

Based on the processing process of the magnesium nano-plate, the embodiment of the invention is different from the traditional flame retardant treatment in that the P-N flame retardant impregnation treatment is directly carried out on the specification grinding powder, and compared with surface coating or impregnation, the penetration amount of the flame retardant is higher and the fireproof performance is stronger.

In step 200, the method of the dipping treatment includes:

the step of vacuumizing is to pump out air reserved inside the abrasive powder, reduce air resistance of the flame retardant entering the abrasive powder and improve osmotic pressure of the flame retardant, and the vacuumizing is generally carried out to 0.08-0.086 MPa for 15-60 min.

the dosage of the nano-magnesium flame retardant is more than 110 kilograms per cubic meter of wood of a first-grade fireproof plate, and the dosage of the nano-magnesium flame retardant is more than 90 kilograms per cubic meter of wood of a second-grade fireproof plate.

and vacuumizing to 0.08-0.86 MPa again in the step, so that the absorbed liquid medicine is completely introduced into the wood, and the liquid medicine on the surface of the wood is prevented from flowing when the wood is taken out from the tank.

In order to further improve the fire retardant impregnation effect of the abrasive powder, before step 201, preheating the ground powder before adding the ground powder into the vacuum tank, and adding the preheated ground powder into the vacuum tank while the ground powder is hot.

The step of adding the preheating treatment is that in the process of cooling the grinding material powder by heat, cells in the wood powder generate certain negative pressure due to expansion and contraction, and the grinding material powder can further absorb the flame retardant liquid under the action of the negative pressure, so that the quality of the flame retardant treatment is improved.

Further, in step 202, the vacuum tank may be pressurized in various manners, i.e., continuously and discontinuously, and in the embodiment of the present invention, preferably discontinuously and intermittently, the milled powder is separately stored and isolated from the P-N flame retardant, and is in a springing state by applying pressure to and fro and maintaining pressure in the vacuum tank, and the state of collision and separation with the P-N flame retardant is switched during springing, so as to obtain the abrasive powder with high impregnation amount of the P-N flame retardant.

Specifically, in step 202, a method for obtaining a high P-N fire retardant impregnation amount of abrasive powder comprises:

step 2024, repeating step 2022 and step 2023 several times until the preset pressure value of the vacuum tank is reached.

The traditional continuous pressurization is that gas is continuously introduced into the vacuum tank so that the pressure in the vacuum tank reaches a preset value, although air reserved inside the abrasive powder is extracted in step 201, in the process of introducing gas for pressurization, part of gas enters the inside of the abrasive powder and still occupies the gap inside the abrasive powder, and the intermittent pressurization mode is adopted, so that the abrasive powder continuously releases the gap occupied by the air inside the abrasive powder and fully absorbs the P-N fire retardant by performing reciprocating pressurization and pressure maintaining on the vacuum tank, and the abrasive powder with high P-N fire retardant impregnation amount is obtained.

The formed nano-magnesium board manufactured in the step 400 is subjected to primary curing and secondary curing before and after being used for cutting the floor strip, specifically,

primary health preserving: the formed magnesium-containing plate after hot pressing is cooled by airing before stacking, and then is cured for 1-3 days after stacking, so that the temperature of the plate is reduced to the ambient temperature, and the ideal temperature is about 30 ℃ and is not more than 45 ℃.

Plate cutting (cutting): and adding machining allowance of 10-11 mm according to the length and width specifications of the finished floor, and cutting the large board into single floor strips according to the size. The small plates which are cut into pieces are stacked in a hollow mode, and the edges of every stack of small plates are aligned up and down to form a straight line, so that internal stress generated by hot pressing can be released quickly.

Secondary health preserving: the cut floor strips are maintained for more than 7 days to release the stress inside the floor and reduce the deformation of the floor, and in order to improve the maintenance effect, the leftover materials and the core materials can be maintained separately.

As shown in fig. 2, an embodiment of the present invention further provides a flame retardant dipping device for a magnesium nano-plate processing process, including a pressure-resistant treatment tank 10 connected with a pressurized air pump 20 and a vacuum extractor 30, wherein a liquid filling port 11 for adding a P-N flame retardant and a release port 12 for releasing the P-N flame retardant are formed in the pressure-resistant treatment tank 10, a powder dipping box 40 for separately storing ground powder is disposed in the pressure-resistant treatment tank 10, the P-N flame retardant is added into the pressure-resistant treatment tank 10 along the liquid filling port 11, flame retardant penetrating holes for the P-N flame retardant to flow through are densely formed in the powder dipping box 40, and a power mechanism 50 for driving the powder dipping box 40 to bounce up and down is disposed in the pressure-resistant treatment tank 10.

Based on the existing structure of the flame-retardant impregnating device, the working principle of the embodiment of the invention is that abrasive powder is separately stored in the powder impregnating box 40, the powder impregnating box 40 comprises a box body 42 and a box cover 43 matched with the box body 42, the abrasive powder is placed in the box cover by opening the box cover, the box cover and the box body can be matched and connected in a manner of snap connection and the like, a P-N flame retardant is added into the pressure-resistant treatment tank 10 along a liquid adding opening 11, and the powder impregnating box 40 moves up and down on the liquid level of the flame retardant by bouncing the powder impregnating box 40 up and down, so that the contact and separation of the abrasive powder in the powder impregnating box 40 and the P-N flame retardant is realized.

Specific analysis: when powder flooding box 40 downstream, abrasive powder and fire retardant constantly are close to until the abrasive powder submergence under the liquid level of fire retardant, the abrasive powder fully absorbs the fire retardant and carries out the flooding work, when powder flooding box 40 upward movement, the drive plays inside abrasive powder and also upward movement together, because the limiting displacement of powder flooding box 40, the abrasive powder is at upward movement and collision powder flooding box 40's top, the collision of the two gives the abrasive powder an effort that is similar to the whipping, so that the crocus material is whipped out the inside air of its surface unabsorbed P-N fire retardant and crocus material.

The power mechanism 50 may be a device directly connected to the powder impregnation box 40 for driving the powder impregnation box 40 to move up and down, and in the embodiment of the present invention, preferably, the power mechanism 50 includes a driving member for intermittently applying a pushing force to the powder impregnation box 40 and a driven member connected to the powder impregnation box 40 for driving the powder impregnation box 40 to move up and down under the intermittent pushing force.

Further, the driving part comprises an air spraying pipe 51 arranged in the pressure-resistant treatment tank 10 and located right above the powder impregnation box, a plurality of air spraying ports 52 are formed in the air spraying pipe 51, an air outlet pipe of the pressurization air pump 20 penetrates through the outer wall of the pressure-resistant treatment tank 10 and is connected with an air inlet end of the air spraying pipe 51 and used for intermittently providing air for the air spraying pipe 51, an automatic opening and closing part is arranged in the air spraying pipe 51 so that the opening and closing of the air spraying ports are consistent with the opening and closing of the pressurization air pump 20, the driven part is a spring 41, one end of the spring 41 is connected with the bottom of the powder impregnation box 40, and the other end of the spring 41 is connected with the bottom of the pressure-resistant treatment tank 10.

The pressurizing air pump 20 of the embodiment of the invention works intermittently, namely, the periodic cycle of starting-stopping-starting-stopping can be realized by manual control, and the automatic work can also be realized by an external PLC control unit, when the pressurizing air pump 20 works, the air nozzle 51 applies downward pushing force to the powder impregnation box 40, the spring 41 is compressed, the powder impregnation box 40 moves downward to be below the liquid level of the fire retardant, when the pressurizing air pump 20 stops working, the powder impregnation box 40 is not under the action of the pushing force any more, the spring 41 recovers the deformation, and the powder impregnation box 40 moves to one side far away from the liquid level of the fire retardant. Compared with the method that a mechanism for driving the powder impregnation box 40 to move up and down is additionally arranged in the pressure-resistant treatment tank 10, the embodiment of the invention combines the power mechanism 50 with the pressurization air pump 20, and the power source of the power mechanism 50 is also from the air source of the pressurization air pump, so that extra power is not required to be added, and the energy consumption is reduced.

As shown in fig. 2 and 3, in order to prevent the fire retardant from flowing back into the air pump 20 along the air nozzle 51 when the air pump 20 is not in operation, an automatic opening and closing member is disposed in the air nozzle 51 to enable the opening and closing of the air nozzle 52 to be consistent with the opening and closing of the air pump 20, the automatic opening and closing member includes a plurality of plugs 53 disposed outside the air nozzle 51 and corresponding to the air nozzle 52 one by one, a plurality of extension springs 55 are disposed inside the air nozzle 51, one end of each extension spring 55 is connected to the inner wall of the air nozzle 51, and the other end of the air nozzle 51 is connected to the plugs 53.

When the air pump 20 works, the airflow is ejected upwards to eject the top plug 53, the expansion spring 55 deforms, the plug 53 releases the blocking effect on the air nozzle 52, the air nozzle 52 is opened, and when the air pump 20 stops working, the expansion spring 55 restores to deform, and the plug 53 covers the air nozzle 52.

Furthermore, a conical plug portion 54 matched with the air nozzle 52 is formed by protruding one surface of the plug 53 facing the air nozzle 52, a cross clamp 56 connected with the conical plug portion 54 is arranged inside the air nozzle 51, and the cross clamp 56 is connected with the expansion spring 55 to prevent the air nozzle 52 from being opened too large.

The air jet pipe 51 is equivalent to an air collecting cavity, the air jet opening 52 jets high-pressure air flow to jet the bottom of the powder dipping box 40, on one hand, the high-pressure air flow can provide an upward acting force for the powder dipping box 40, on the other hand, the high-pressure air flow can further stir wood powder in the powder dipping box 40 to intensify the collision between the wood powder and dipping liquid, so that the phenomenon that the opening of the air jet opening 52 is too large is avoided, and the air flow jetted by the air jet opening 52 can be in a high-pressure state.

In addition, it should be further explained in the embodiments of the present invention that the fire retardant penetration holes are distributed around the box cover and the box body, and the bottom of the box body is not provided with holes, so that when the airflow injected into the powder impregnation box 40 collides downward, the movement trajectory of the airflow is changed by the barrier at the bottom of the box body to form a turbulent flow in the powder impregnation box 40, and the pulverized powder in the powder impregnation box 40 is further agitated to make the pulverized powder fully collide with the fire retardant, thereby increasing the absorption surface.

Meanwhile, in order to match with the preheating treatment of the abrasive powder before the addition of the pressure-resistant treatment tank 10, a heat-insulating layer 13 is directly covered on the outer wall of the pressure-resistant treatment tank 10, an interlayer 14 is arranged between the heat-insulating layer 13 and the outer wall, and a heating medium inlet 15 and a heating medium outlet 16 communicated with the interlayer 13 are arranged on the heat-insulating layer 13, namely the pressure-resistant treatment tank has a heating function so as to avoid secondary transfer of the wood powder.

The above embodiments are only exemplary embodiments of the present application, and are not intended to limit the present application, and the protection scope of the present application is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present application and such modifications and equivalents should also be considered to be within the scope of the present application.

Claims

1. A process for processing a nano magnesium plate is characterized by comprising the following steps of,

step 400, sequentially overlapping the wear-resistant paper, the decorative paper, the magnesium containing plate base material and the balance paper, and performing hot press molding to obtain a molded magnesium containing plate;

the method for the impregnation treatment comprises the following steps:

step 205, finally, the vacuum tank is decompressed again, and the ground powder is taken out of the vacuum tank and dried;

the grinding powder is separately stored and isolated from the P-N flame retardant, the pressurization adopts an intermittent mode, the grinding powder is in a springing state by reciprocating pressurization and pressure maintaining of a vacuum tank, and the grinding powder is switched with a collision and separation state with the P-N flame retardant in the springing process to obtain the grinding powder with high P-N flame retardant impregnation amount;

2. The process of claim 1, further comprising, before the step 201, preheating the ground powder before the step of adding the ground powder into the vacuum tank, and adding the preheated ground powder into the vacuum tank while the ground powder is hot.

3. A flame-retardant impregnating device applied to the magnesium nano-plate processing technology of claim 1 or 2, which comprises a pressure-resistant processing tank (10) connected with a pressurized air pump (20) and a vacuumizing device (30), and is characterized in that a liquid filling port (11) for adding a P-N flame retardant and a releasing port (12) for releasing the P-N flame retardant are formed in the pressure-resistant processing tank (10), a powder impregnating box (40) for independently storing grinding powder is arranged in the pressure-resistant processing tank (10), the P-N flame retardant is added into the pressure-resistant processing tank (10) along the liquid filling port (11), flame retardant penetrating holes for the P-N flame retardant to circulate are densely formed in the powder impregnating box (40), and a power mechanism (50) for driving the powder impregnating box (40) to bounce up and down is arranged in the pressure-resistant processing tank (10), so as to realize the contact and separation of the grinding powder in the powder impregnation box (40) and the P-N flame retardant.

4. A fire retardant steeping device as claimed in claim 3, wherein the power mechanism (50) comprises a driving member for intermittently applying a pushing force to the powder steeping box (40) and a driven member connected to the powder steeping box (40) and driving the powder steeping box (40) to move up and down by the intermittent pushing force.

5. A fire retardant impregnation apparatus according to claim 4, wherein said active member comprises an air injection pipe (51) disposed in said pressure resistant treatment tank (10) directly above said powder impregnation box, a plurality of air nozzles (52) are arranged on the air spray pipe (51), an air outlet pipe of the pressurization air pump (20) penetrates through the outer wall of the pressure-resistant treatment tank (10) and is connected with the air inlet end of the air spray pipe (51) for intermittently providing air injection for the air spray pipe (51), an automatic opening and closing piece is arranged in the air spray pipe (51) to ensure that the opening and closing of the air spray nozzle are consistent with the opening and closing of the pressurization air pump (20), the driven part is a spring (41), one end of the spring (41) is connected with the bottom of the powder dipping box (40), the other end of the spring (41) is connected with the bottom of the pressure-resistant treatment tank (10).

6. A fire retardant impregnation device according to claim 5, wherein said automatic opening and closing means comprises a plurality of plugs (53) disposed outside said air nozzle (51) and corresponding to said air nozzles (52), a plurality of extension springs (55) are disposed inside said air nozzle (51), one end of said extension springs (55) is connected to the inner wall of said air nozzle (51), and the other end of said air nozzle (51) is connected to said plugs (53).

7. A fire retardant impregnation device according to claim 6, characterized in that the side of the plug (53) facing the air nozzle (52) is raised to form a conical plug (54) which is fitted to the air nozzle (52), and the air nozzle (51) is internally provided with a cross-shaped clamp (56) which is connected to the conical plug (54), the cross-shaped clamp (56) being connected to the expansion spring (55) for preventing the air nozzle (52) from being opened too much.