CN117486633A

CN117486633A - Continuous production method and system for hydrophobic film on surface of gypsum board

Info

Publication number: CN117486633A
Application number: CN202311394448.1A
Authority: CN
Inventors: 赵洪玲
Original assignee: Beixin Building Materials Kunming Co ltd
Current assignee: Beixin Building Materials Kunming Co ltd
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2024-02-02

Abstract

The invention discloses a continuous production method of a hydrophobic film on the surface of a gypsum board, which comprises the following steps: adding methyl hydrogen-containing silicone oil into potassium hydroxide solution to obtain silicone oil alkali solution A; adding the silicone oil alkali solution A into stirring water to obtain a silicone oil alkali solution B; uniformly coating a silicone oil alkali solution B on a wet plate through roller coating equipment, performing high-temperature film forming, and hydrolyzing the residual Si-H groups in the silicone oil alkali solution B and water vapor generated by the wet plate at high temperature to obtain a dry plate and a surface hydrophobic film fixed on the dry plate; and a system for a continuous production method of a hydrophobic film on the surface of the thistle board. The invention realizes continuous roller coating film of the lower facing paper of the wet board in the conveying process of the wet board, reduces the time cost, simultaneously, the surface hydrophobic film roller coated on the gypsum board can not influence the circulation of steam and consume steam, reduces the accumulation of steam, and improves the connection effect of the lower facing paper and the gypsum board core.

Description

Continuous production method and system for hydrophobic film on surface of gypsum board

Technical Field

The invention relates to the field of gypsum board production, in particular to a continuous production method and a continuous production system for a hydrophobic film on the surface of a paper-surface gypsum board.

Background

The gypsum board is a common building material and has extremely high application value, but people find that the gypsum board core material has the characteristic of easy moisture absorption when in use, and is easy to absorb water and mould and even crack in a humid environment, so that the durability of the gypsum board is reduced, and how to improve the durability of the gypsum board and reduce the water absorption rate of the gypsum board becomes a difficult problem.

The most common gypsum board type on the market is thistle board, the main components of the gypsum board are gypsum, facing paper and part of additives, in order to reduce the water absorption rate of the gypsum board, hydrophobic materials are added in the process of preparing a board core of the gypsum board to prevent the board core of the gypsum board from absorbing water, but the facing paper has the characteristic of easy moisture absorption, the surface of the facing paper is hydrophilic, water can permeate the paper surface to enter a gypsum core layer, and the water can permeate the board core for a long time, so that the adhesion between the paper surface and gypsum is damaged, and the connection force between gypsum molecules is damaged, thereby influencing normal use.

In order to prevent the facing paper from being wet and moldy and to prevent water from penetrating from the facing paper into the board core, the facing paper may now be subjected to a coating operation to improve the waterproof performance of the gypsum board. However, in the actual process, the pre-coating of the waterproof film on the facing paper has the following two defects: 1. the pre-laminating operation of the facing paper can prolong the preparation process line of the gypsum board, so that the production time of the gypsum board is prolonged, and the preparation cost is greatly increased; 2. because the facing paper has the characteristic of hydrophobicity, when the wet board is dried, the water vapor is not easy to flow out from the facing paper when rising from the board core to the facing paper, and the steam is easy to separate the board core of the gypsum board from the facing paper in the continuous extrusion process, so that the bulge is generated, and the performance of the gypsum board is reduced.

Disclosure of Invention

The invention aims to provide a continuous production method and a continuous production system for a hydrophobic film on the surface of a gypsum board, which are used for solving the technical problems of prolonged production line and difficult discharge of water vapor generated when the surface hydrophobic film is coated on the gypsum board in the prior art.

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

the invention provides a continuous production method of a hydrophobic film on the surface of a gypsum board, which comprises the following steps:

dissolving potassium hydroxide in solvent water to obtain a potassium hydroxide solution with the mass fraction of 20%;

adding methyl hydrogen-containing silicone oil into the potassium hydroxide solution for first hydrolysis, and uniformly stirring to obtain a silicone oil alkali solution A, wherein the silicone oil alkali solution A contains Si-H groups;

adding the silicone oil alkali solution A into stirring water to carry out secondary hydrolysis, hydrolyzing part of Si-H groups in the silicone oil alkali solution A into Si-OH groups, and uniformly stirring to obtain a silicone oil alkali solution B;

uniformly coating the silicone oil alkali solution B on a wet plate through roller coating equipment, forming a film at a high temperature, and carrying out third hydrolysis on the Si-H groups remained in the silicone oil alkali solution B and water vapor generated by the wet plate at a high temperature to obtain a dry plate and a surface hydrophobic film fixed on the dry plate;

and part of Si-OH groups in the third hydrolysis can be combined with the surface paper fiber on the wet board, and the rest of Si-OH groups form a stable-Si-O-covalent network through self-condensation polymerization to cover the surface of the dry board, so that the surface hydrophobic film is fixed on the dry board.

As a preferred embodiment of the present invention, the silicone oil alkali solution B is roll-coated onto the surface of the lower facing paper of the wet board.

As a preferred embodiment of the present invention, during the high temperature film forming process, the remaining water vapor overflows from the bottom of the wet plate until the wet plate forms the dry plate.

As a preferred embodiment of the present invention, the wet board is an undried gypsum plasterboard.

As a preferred embodiment of the present invention, in the first hydrolysis process, the potassium hydroxide solution: the methyl hydrogen silicone oil is 1:5;

during the second hydrolysis, the silicone oil base solution a: the stirring water is 1:2.

The invention also provides a system for the continuous production method of the hydrophobic film on the surface of the thistle board, which comprises the following steps:

the device comprises a mixing device for continuously producing a silicone oil alkali solution B and a conveying device for continuously conveying a wet plate, wherein the mixing device is connected with the conveying device through a roller coating device, the mixing device feeds the silicone oil alkali solution B into the roller coating device, and the roller coating device rolls the silicone oil alkali solution B onto lower protective paper of the wet plate on the conveying device;

and a dryer is arranged at the downstream of the conveying device and is used for drying the wet plate after the silicone oil alkali solution B is coated by roller, and meanwhile, the silicone oil alkali solution B forms a film on the wet plate at a high temperature.

As a preferable scheme of the invention, the continuous blanking device further comprises a control component which is in communication connection with the mixing device and is used for controlling the mixing device to continuously blanking the roller coating equipment.

As a preferable scheme of the invention, the mixing device is sequentially provided with a solid-liquid mixing bin for preparing potassium hydroxide solution, a primary hydrolysis bin for preparing silicone oil alkali solution A and a secondary hydrolysis bin for preparing silicone oil alkali solution B from top to bottom, the secondary hydrolysis bin is connected with the roller coating equipment, and the solid-liquid mixing bin, the primary hydrolysis bin and the secondary hydrolysis bin are sequentially communicated through an automatic blanking pipe;

the primary hydrolysis bin and the secondary hydrolysis bin are externally connected with a feeding pipe, the feeding pipe can simultaneously add required materials to the solid-liquid mixing bin, the primary hydrolysis bin and the secondary hydrolysis bin, and the solid-liquid mixing bin is provided with a quantitative feeding barrel which can introduce quantitative materials to the solid-liquid mixing bin;

the automatic discharging pipe, the quantitative feeding cylinder and the feeding pipe are all connected with the control assembly.

As a preferable scheme of the invention, a liquid level sensor is arranged in the secondary hydrolysis bin and is in communication connection with the control component;

when the height of the solution in the secondary hydrolysis bin is lower than that of the liquid level sensor, the liquid level sensor sends a feeding signal to the control assembly, the control assembly controls the quantitative feeding barrel and the feeding pipe to carry out single feeding, and the automatic discharging pipe from top to bottom is sequentially opened to realize single feeding of the secondary hydrolysis bin.

As a preferable scheme of the invention, the roller coating equipment comprises a bracket arranged on the conveying device, wherein the bracket spans the conveying device and can be arranged above the wet plate in a suspending way, a napping roller is rotatably arranged in the bracket through a bearing, a liquid outlet is connected above the napping roller, and the bottom of the napping roller can be attached to the wet plate;

the liquid outlet is communicated with the secondary hydrolysis bin through a discharging channel, a valve is arranged in the discharging channel, and the valve is in communication connection with the control assembly;

the liquid outlet is provided with a roller, the outer wall of the roller is attached to the napping roller, the roller can be driven to roll in the blanking channel and drive the silicone oil alkali solution B to flow out of the liquid outlet when the napping roller is in roller coating, and the silicone oil alkali solution B is absorbed by the napping roller and is roller coated on the wet plate.

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

according to the invention, the methyl hydrogen silicone oil waterproof film is prepared in the wet plate forming process, continuous roller coating of the lower facing paper of the wet plate is realized in the wet plate conveying process, and the dry plate and the surface hydrophobic film fixed on the dry plate are simultaneously obtained through high-temperature drying after roller coating, so that the continuous film coating process of the lower facing paper in the production process is realized, the facing paper is not required to be treated in advance, the preparation time of the gypsum board is ensured, and the time cost is not increased;

according to the invention, after the methyl hydrogen silicone oil waterproof film is primarily roll-coated on the wet board, the wet board is sent into a dryer for high-temperature secondary coating, and water vapor on the wet board reacts with the material for the first roll coating at a high temperature state to generate the surface waterproof film fixed on the gypsum board, so that the circulation of the vapor is not influenced, the vapor is consumed, the accumulation of the vapor is reduced, and the connection effect of the lower facing paper and the gypsum board core is improved;

according to the invention, through the simultaneous gypsum board production device and the waterproof film coating device and the simple roller coating equipment, the two equipment are crossed together, so that the continuous film coating treatment of the gypsum board on the gypsum board production line is realized, the action structure is simple, the process time is saved, and the production cost is reduced.

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 will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

FIG. 1 is a schematic flow chart of a continuous production method for providing a hydrophobic film on the surface of a gypsum board;

FIG. 2 is a schematic diagram of the system for providing a continuous process for producing a hydrophobic film on the surface of a gypsum board in accordance with the present invention;

FIG. 3 is a schematic view showing the internal structure of the mixing device according to the embodiment shown in FIG. 2;

FIG. 4 is a schematic view of a front partial structure of the roll coating apparatus according to the embodiment shown in FIG. 2;

fig. 5 is a schematic view showing a partial structure of the roll coating apparatus according to the embodiment shown in fig. 2.

Reference numerals in the drawings are respectively as follows:

1-a conveying device; 2-a mixing device; 3-roll coating equipment; 4-a dryer; 5-a liquid level sensor; 6-wet plate;

201-a solid-liquid mixing bin; 202-a primary hydrolysis bin; 203-a secondary hydrolysis bin; 204-automatic blanking pipe; 205-feeding pipe; 206-quantitative feeding cylinder; 207-stirring paddles;

301-a bracket; 302-a bearing; 303-a napping roller; 304-a liquid outlet; 305-a blanking channel; 306-valve; 307-rollers.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in FIG. 1, the invention provides a continuous production method of a hydrophobic film on the surface of a gypsum board, which comprises the following steps:

adding methyl hydrogen-containing silicone oil into potassium hydroxide solution for first hydrolysis, and uniformly stirring to obtain silicone oil alkali solution A, wherein the silicone oil alkali solution A contains Si-H groups, and the potassium hydroxide solution mainly provides an alkaline environment for the silicone oil alkali solution A;

adding the silicone oil alkali solution A into stirring water to carry out secondary hydrolysis, and carrying out hydrolysis reaction on Si-H groups and water in the solution under an alkaline environment to generate hydrophobic groups Si-OH, and uniformly stirring to obtain a silicone oil alkali solution B, wherein part of unhydrolyzed Si-H groups remain in the silicone oil alkali solution B;

the steps are all carried out in the process of preparing the wet board, and when the preparation of the silicone oil alkali solution B is completed, the wet board on the gypsum board production line is prepared simultaneously;

uniformly smearing a silicone oil alkali solution B on a wet board through roller coating equipment, conveying the wet board into a gypsum board dryer for high-temperature film forming, carrying out third hydrolysis on Si-H groups remained in the silicone oil alkali solution B and water vapor generated by the wet board at high temperature, and obtaining a dry board and a surface hydrophobic film fixed on the dry board along with complete overflow of the water vapor in the wet board;

wherein, part of Si-OH groups hydrolyzed for the third time can be combined with the paper fiber of the facing paper on the wet board, and the rest Si-OH groups form a stable-Si-O-covalent network by self-condensation polymerization to cover the surface of the dry board, thereby realizing the fixation of the surface hydrophobic film on the dry board;

the water drops on the surface of the finished product thistle board are tested by dripping water drops, so that the water drops can be seen to form water drops on the surface of the thistle board, the water drops can roll on the surface, and no water luster is left on the paper surface after the water drops roll.

After the surface absorption test according to the test method, the surface absorption can be obviously reduced.

In the preparation method, the preparation and the drying of the wet board belong to the original preparation process, the process parameters are not changed on the basis of the original preparation process, but in the process of conveying the wet board, the waterproof material which is prepared simultaneously is rolled onto the wet board of the gypsum board through a roller coating device, so that the continuous film coating process of the lower facing paper in the production process is realized, the facing paper is not required to be treated in advance, the preparation time of the gypsum board is ensured, and the time cost is not increased.

After the methyl hydrogen silicone oil waterproof film is primarily roll-coated on the wet board, the wet board is sent into a dryer for high-temperature secondary film coating, and water vapor on the wet board reacts with the material for the first roll coating under the high-temperature state to generate a surface hydrophobic film fixed on the gypsum board, so that the circulation of the vapor is not influenced, the vapor can react with the vapor, the accumulation of the vapor is reduced, and the connection effect of the lower facing paper and the gypsum board core is improved.

Since the properties of the gypsum board, such as supporting properties and the like, are mainly provided by the lower facing paper, the silicone oil alkali solution B is roll-coated to the surface of the lower facing paper of the wet board. Only the methyl hydrogen silicone oil waterproof film is coated on the lower facing paper in a roller mode, water vapor evaporated onto the lower facing paper can be absorbed, the lower facing paper is connected with the plate core of the gypsum board more tightly, a better supporting waterproof effect is achieved, the coating process of the film can be simplified, and production cost is reduced.

As drying proceeds, the surface hydrophobic film is continuously formed on the gypsum board, and subsequent water vapor is difficult to be discharged from the position of the lower facing paper, so that during the high-temperature film forming process, the remaining water vapor overflows from the bottom of the wet board until the wet board forms a dry board. Therefore, in the preparation process of the surface hydrophobic film, the waterproof film is coated on the lower facing paper, and the double-sided coating has poor effect and is unfavorable for the outflow of water vapor.

The wet board is an undried paper gypsum board, and the preparation, cutting and the like of the wet board do not affect the continuous production of the surface hydrophobic film, so the steps of the preparation, cutting and the like of the wet board are omitted in the invention.

In the second hydrolysis process, si-OH and Si-H which are not hydrolyzed yet are contained in the methyl hydrogen-containing silicone oil, so that the water content is important in the second hydrolysis process, and in the first hydrolysis process, the potassium hydroxide solution is prepared by the following steps: the methyl hydrogen silicone oil is 1:5,

in the second hydrolysis process, silicone oil alkali solution a: the water was stirred at 1:2.

In order to distinguish the preparation of the alkaline solution from the second hydrolysis process, the water in the alkaline solution prepared for the first time is referred to as solvent water, and the water reacted with the silicone oil alkali solution A in the second hydrolysis process is referred to as stirring water, but the solvent water and the stirring water belong to common water in the market. Such as distilled water, etc.

The method can obtain the surface hydrophobic film which is prepared together with the gypsum board and is molded together, thus belonging to the parallel line production, and absorbing the water vapor on the wet board of the gypsum board in the parallel line production process, thereby having beneficial effect on the production of the gypsum board. The production of gypsum board has common equipment in the market, but the invention further discloses how to carry out beneficial combination of the production of the surface hydrophobic film and the gypsum board production line, thereby realizing continuous production laminating operation.

As shown in fig. 2 to 5, the present invention further discloses a system for a continuous production method of a hydrophobic film on the surface of a gypsum board, comprising:

a mixing device 2 for continuously producing a silicone oil alkali solution B and a conveying device 1 for continuously conveying wet boards, wherein the mixing device 2 is connected with the conveying device 1 through a roller coating device 3, the mixing device 2 feeds the silicone oil alkali solution B into the roller coating device 3, and the roller coating device 3 rolls the silicone oil alkali solution B onto lower protective paper of the wet boards on the conveying device 1.

A dryer 4 is arranged at the downstream of the conveying device 1, the dryer 4 is used for drying a wet plate after the silicone oil alkali solution B is coated by roller, and meanwhile, the silicone oil alkali solution B forms a film on the wet plate at a high temperature.

In the process of preparing the wet board, the mixing device 2 completes preparation of the silicone oil alkali solution B at the same time, when the wet board enters into a roller coating position, the roller coating equipment 3 is introduced with the silicone oil alkali solution B and completes roller coating work on the surface of the facing paper on the wet board, the action is continuous and uninterrupted, the wet board directly enters into the dryer 4 for drying after being roller coated, at the moment, the silicone oil alkali solution B and water vapor of the high-temperature drying wet board core of the dryer generate, so that not only water molecules which are not hydrolyzed Si-H and evaporated from the board core continue to hydrolyze into Si-OH, but also part of Si-OH is combined with the facing paper fiber to fix hydrophobic groups on the surface of the gypsum board, and the other Si-OH forms a more stable-Si-O-covalent network to cover the surface of the gypsum board through self-condensation polymerization, and finally forms a hydrophobic film on the surface of the gypsum board. And a dry board can be obtained, and the surface hydrophobic membrane is directly fixed on the dry board at the moment, so that the continuous production of the surface hydrophobic membrane of the gypsum board is realized.

In order to prevent the silicone oil alkali solution B from being used up, a refueling operation is required, and at this time, the production of the wet plate is stopped, which causes a large loss. Therefore, in this embodiment, the roller coating device further includes a control component, the control component can drive the mixing device 2 to perform full-automatic continuous production, the control component is in communication connection with the mixing device 2, and meanwhile, the control component is used for controlling the mixing device 2 to continuously feed the roller coating device 3.

Further, the mixing device 2 is provided with a solid-liquid mixing bin 201 for preparing a potassium hydroxide solution, a primary hydrolysis bin 202 for preparing a silicone oil alkali solution a, and a secondary hydrolysis bin 203 for preparing a silicone oil alkali solution B in this order from top to bottom.

The solid-liquid mixing bin 201 is connected with a feeding pipe 205 for automatically introducing quantitative solvent water into the bin body and a quantitative feeding barrel 206 for automatically introducing quantitative potassium hydroxide into the bin body, and the feeding pipe 205 and the quantitative feeding barrel 206 are controlled by a control assembly. The stirring paddle 207 which can stir the solvent water and the potassium hydroxide is arranged in the solid-liquid mixing bin 201, the bottom of the solid-liquid mixing bin 201 is connected with the automatic discharging pipe 204, the solid-liquid mixing bin 201 can be connected with the primary hydrolysis bin 202 through the automatic discharging pipe 204, and the automatic discharging pipe 204 is in communication connection with the control component.

The primary hydrolysis bin 202 is connected with a feeding pipe 205 for automatically introducing quantitative methyl hydrogen silicone oil into the bin body, and the feeding pipe 205 is controlled by a control component. The primary hydrolysis bin 202 is internally provided with a stirring paddle 207 which can stir methyl hydrogen silicone oil and potassium hydroxide solution, the bottom of the primary hydrolysis bin 202 is connected with an automatic discharging pipe 204, the primary hydrolysis bin 202 can be connected with a secondary hydrolysis bin 203 through the automatic discharging pipe 204, and the automatic discharging pipe 204 is in communication connection with a control component.

The secondary hydrolysis bin 203 is connected with a feeding pipe 205 for automatically introducing quantitative stirring water into the bin body, and the feeding pipe 205 is controlled by a control component. The secondary hydrolysis bin 203 is internally provided with a stirring paddle 207 which can stir the silicone oil alkali solution A and stirring water, the bottom of the secondary hydrolysis bin 203 is connected with an automatic discharging pipe 204, and the secondary hydrolysis bin 203 is connected with roller coating equipment 3.

In particular, the specific working arrangement of the mixing device 2 is as follows:

1. the feeding pipe on the solid-liquid mixing bin 201, the quantitative feeding barrel 206, the feeding pipe 205 on the secondary hydrolysis bin 203 and the feeding pipe 205 on the primary hydrolysis bin 202 are simultaneously opened for feeding, and are closed after the feeding is completed;

2. after the mixing of the potassium hydroxide solution with the mass fraction of 20% in the solid-liquid mixing bin 201 is completed, an automatic blanking pipe 204 arranged at the bottom of the solid-liquid mixing bin 201 is opened, and the potassium hydroxide solution enters the primary hydrolysis bin 202 to be mixed with methyl hydrogen-containing silicone oil;

3. after 5min of mixing, a silicone oil alkali solution A is obtained, an automatic discharging pipe 204 arranged at the bottom of the primary hydrolysis bin 202 is opened, and the silicone oil alkali solution A enters a secondary hydrolysis bin 203 to be mixed with stirring water;

4. after mixing for 10min, a silicone oil alkali solution B is obtained, and the roller coating equipment 3 is used for roller coating the silicone oil alkali solution B on the upper surface protection paper of the wet board.

In the invention, although the feeding pipe and the automatic discharging pipe of each bin body are not independently named, obviously, the feeding pipes in each bin body work together, but the extracted media and the media are different, the automatic discharging pipes have the same function but different switching time, the extracted media and the respective switching time are controlled by the control component, the control component can be changed along with the transportation speed of the wet plate, and the parameters can be freely set according to the requirements of factories.

In order to control the production cost, a liquid level sensor 5 is arranged in the secondary hydrolysis bin 203, the liquid level sensor 5 is in communication connection with a control component, when the height of the solution in the secondary hydrolysis bin 203 is lower than that of the liquid level sensor 5, the liquid level sensor 5 sends a feeding signal to the control component, the control component controls a quantitative feeding barrel 206 and a feeding pipe 205 to carry out single feeding, and an automatic discharging pipe 204 from top to bottom is sequentially opened to realize single feeding of the secondary hydrolysis bin 203, and after feeding is finished, the height of the solution in the secondary hydrolysis bin 203 is higher than that of the liquid level sensor 5.

In the feeding process, the secondary hydrolysis bin 203 can also continuously feed, and the roll coating process is continuous.

Further, in order to facilitate roll coating, the roll coating device 3 comprises a support 301 installed on the conveying device 1, the support 301 spans the conveying device 1 and can be arranged above the wet plate in a suspended mode, a roughening roller 303 is rotatably installed in the support 301 through a bearing 302, a liquid outlet 304 is connected to the upper portion of the roughening roller 303, the bottom of the roughening roller 303 can be attached to the wet plate, and when the wet plate moves, the roughening roller 303 can move simultaneously under the action of friction force.

The liquid outlet 304 is communicated with the secondary hydrolysis bin 203 through a discharging channel 305, a valve 306 is arranged in the discharging channel 305, the valve 306 is in communication connection with a control component, the control component can control the valve 306 to open and close, and in the working process, the valve 306 is continuously in an open state.

The liquid outlet 304 is provided with the roller 307, and the outer wall of roller 307 and napping cylinder 303 laminating set up, can drive roller 307 in unloading passageway 305 roll and drive silicone oil alkali solution B and flow from the liquid outlet 304 when napping cylinder 303 cylinder, and silicone oil alkali solution B is absorbed by napping cylinder 303 and roll-coated to wet board, realizes the continuous roller coating to wet board.

Through the continuous production method and the system of the surface hydrophobic film of the gypsum board, continuous roller coating of the lower facing paper of the wet board can be realized in the conveying process of the wet board, the facing paper does not need to be treated in advance, meanwhile, the surface hydrophobic film roller coated on the gypsum board can reduce accumulation of steam without affecting circulation of steam and consuming steam, and the connection effect of the lower facing paper and the gypsum board core is improved.

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

Claims

1. A continuous production method of a hydrophobic film on the surface of a gypsum board is characterized by comprising the following steps:

2. The continuous production method of the hydrophobic film on the surface of the thistle board according to claim 1, wherein,

the silicone oil alkali solution B is roll-coated to the surface of the lower facing paper of the wet board.

3. A continuous process for producing a hydrophobic film on the surface of a gypsum board as claimed in claim 2, wherein,

during high temperature film formation, the remaining water vapor overflows from the bottom of the wet plate until the wet plate forms the dry plate.

4. The continuous production method of the hydrophobic film on the surface of the thistle board according to claim 1, wherein,

the wet board is an undried paper gypsum board.

5. The continuous production method of the hydrophobic film on the surface of the thistle board according to claim 1, wherein,

in the first hydrolysis process, the potassium hydroxide solution comprises the following components in percentage by weight: the methyl hydrogen silicone oil is 1:5;

6. A system for a continuous process for producing a hydrophobic film on the surface of a gypsum board according to any one of claims 1 to 5, comprising:

a mixing device (2) for continuously producing a silicone oil alkali solution B and a conveying device (1) for continuously conveying wet boards, wherein the mixing device (2) is connected with the conveying device (1) through a roller coating device (3), the mixing device (2) feeds the silicone oil alkali solution B into the roller coating device (3), and the roller coating device (3) rolls the silicone oil alkali solution B onto lower protective facial tissues of the wet boards on the conveying device (1);

and a dryer (4) is arranged at the downstream of the conveying device (1), the dryer (4) is used for drying the wet plate after the silicone oil alkali solution B is coated by roller, and meanwhile, the silicone oil alkali solution B forms a film on the wet plate at a high temperature.

7. A system for a continuous process for the production of a hydrophobic film on the surface of a gypsum board as claimed in claim 6, wherein,

the roller coating device is characterized by further comprising a control assembly, wherein the control assembly is in communication connection with the mixing device (2) and is used for controlling the mixing device (2) to continuously feed the roller coating device (3).

8. A system for a continuous process for the production of a hydrophobic film on the surface of a gypsum board as claimed in claim 7, wherein,

the mixing device (2) is sequentially provided with a solid-liquid mixing bin (201) for preparing potassium hydroxide solution, a primary hydrolysis bin (202) for preparing silicone oil alkali solution A and a secondary hydrolysis bin (203) for preparing silicone oil alkali solution B from top to bottom, the secondary hydrolysis bin (203) is connected with the roller coating equipment (3), and the solid-liquid mixing bin (201), the primary hydrolysis bin (202) and the secondary hydrolysis bin (203) are sequentially communicated through an automatic discharging pipe (204);

the primary hydrolysis bin (202) and the secondary hydrolysis bin (203) are externally connected with a feeding pipe (205), the feeding pipe (205) can simultaneously add required materials into the solid-liquid mixing bin (201), the primary hydrolysis bin (202) and the secondary hydrolysis bin (203), and a quantitative feeding cylinder (206) capable of introducing quantitative materials into the solid-liquid mixing bin (201) is arranged on the solid-liquid mixing bin (201);

the automatic discharging pipe (204), the quantitative feeding cylinder (206) and the feeding pipe (205) are connected with the control assembly.

9. A system for a continuous process for the production of a hydrophobic film on the surface of a gypsum board as claimed in claim 8, wherein,

a liquid level sensor (5) is arranged in the secondary hydrolysis bin (203), and the liquid level sensor (5) is in communication connection with the control component;

when the height of the solution in the secondary hydrolysis bin (203) is lower than that of the liquid level sensor (5), the liquid level sensor (5) sends a feeding signal to the control component, the control component controls the quantitative feeding cylinder (206) and the feeding pipe (205) to carry out single feeding, and the automatic discharging pipe (204) from top to bottom is sequentially opened to realize single feeding of the secondary hydrolysis bin (203).

10. The continuous production method and system for the hydrophobic film on the surface of the thistle board according to claim 9, characterized in that,

the roller coating equipment (3) comprises a support (301) arranged on the conveying device (1), the support (301) spans the conveying device (1) and can be arranged above the wet plate in a suspending manner, a napping roller (303) is rotatably arranged in the support (301) through a bearing (302), a liquid outlet (304) is connected above the napping roller (303), and the bottom of the napping roller (303) can be attached to the wet plate;

the liquid outlet (304) is communicated with the secondary hydrolysis bin (203) through a discharging channel (305), a valve (306) is arranged in the discharging channel (305), and the valve (306) is in communication connection with the control component;

the liquid outlet (304) is provided with a roller (307), the outer wall of the roller (307) is attached to the napping roller (303), the roller (307) can be driven to roll in the blanking channel (305) and drive the silicone alkali solution B to flow out of the liquid outlet (304) when the napping roller (303) is used for rolling, and the silicone alkali solution B is absorbed by the napping roller (303) and is rolled on the wet plate.