CN117986034B - Method for preparing hydrophobic film on surface of gypsum board - Google Patents
Method for preparing hydrophobic film on surface of gypsum board Download PDFInfo
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- CN117986034B CN117986034B CN202410004427.2A CN202410004427A CN117986034B CN 117986034 B CN117986034 B CN 117986034B CN 202410004427 A CN202410004427 A CN 202410004427A CN 117986034 B CN117986034 B CN 117986034B
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- lower facing
- facing paper
- gypsum board
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- smearing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for preparing a hydrophobic film on the surface of a gypsum board, which comprises the following steps: and (3) smearing an alkali solution mixed with methyl hydrogen silicone oil on the front surface of the lower facing paper, and then drying the wet gypsum board. In the process of drying the gypsum board wet board under alkaline conditions, the Si-H which is not hydrolyzed and water molecules evaporated from the board core continue to hydrolyze into Si-OH, part of the Si-OH is combined with the facing paper fiber to fix the hydrophobic group on the front surface of the gypsum board, and the other Si-OH forms a more stable-Si-O-covalent network through self-condensation polymerization to cover the front surface of the gypsum board, so that the front surface of the gypsum board forms a hydrophobic film.
Description
Technical Field
The invention relates to the field of gypsum board production lines, in particular to a method for preparing a hydrophobic film on the surface of a paper-surface gypsum board.
Background
The main components of the paper surface gypsum board are gypsum, surface protection paper and partial additives, the gypsum and the surface protection paper have the characteristic of easy moisture absorption, the surface of the surface protection paper has hydrophilicity, and water can permeate through the paper surface to enter the gypsum core layer in the environment with high humidity.
To solve this problem, a hydrophobic film may be formed on the front surface of the gypsum board to prevent moisture from penetrating the paper surface into the gypsum core layer, and the lower facing paper of the gypsum board is known as a use surface, and one surface of the upper facing paper of the gypsum board is generally facing a wall or a ceiling and is not generally affected by a humid environment, so that it is generally only necessary to form a hydrophobic film on the front surface of the lower facing paper.
Disclosure of Invention
The invention aims to provide a method for preparing a hydrophobic film on the surface of a gypsum board, which aims to solve the technical problem of how to form the hydrophobic film on the front surface of lower facing paper of the gypsum board.
In order to solve the technical problems, the invention specifically provides the following technical scheme:
A process for preparing hydrophobic film on the surface of gypsum board includes such steps as coating the aqueous alkali mixed with methyl hydrogen-contained silicone oil on the front surface of lower protecting paper, and baking.
Further, after the lower facing paper passes through the lower facing paper deviation corrector, the alkaline solution is smeared on the front surface of the lower facing paper.
Further, the alkaline solution is applied to the front side of the lower facer sheet prior to the lower facer sheet passing through the lower facer scoring machine.
Further, a second lower facing paper deviation corrector is added between the lower facing paper deviation corrector and the lower facing paper scoring machine, and after the alkaline solution is smeared on the front surface of the lower facing paper, the lower facing paper passes through the second lower facing paper deviation corrector.
Further, a blank area with the width of 10 mm-15 mm is reserved on two sides of the front face of the lower facing paper, and the alkali solution is smeared on the positions outside the blank area.
Further, the step of coating the alkali solution mixed with the methyl hydrogen silicone oil on the front surface of the lower facial tissue comprises the steps of spraying the alkali solution on the front surface of the lower facial tissue by using a spray gun, and trowelling the alkali solution attached to the front surface of the lower facial tissue by using a coating part.
Further, the number of the spray guns is a plurality, the spray guns are arranged side by side at equal intervals along the width direction of the lower facial tissue, each spray gun can be independently opened or closed, the number of the coating parts is at least 2, the coating parts form a continuous and uninterrupted coating area in the width direction of the lower facial tissue, the position of at least 1 coating part in the width direction of the lower facial tissue can be adjusted to change the whole width of the coating area, the step of spraying the alkali solution on the front surface of the lower facial tissue by using the spray guns comprises the steps of selectively opening part of the spray guns so that the alkali solution sprayed on the lower facial tissue by the spray guns avoids a blank area, and the step of trowelling the alkali solution attached on the front surface of the lower facial tissue by using the coating parts comprises the steps of adjusting the positions of the coating parts to change the whole width of the coating area so that the edge of the coating area is attached to the edge of the blank area.
Further, the step of coating the alkaline solution mixed with the methyl hydrogen-containing silicone oil on the front surface of the lower facial tissue further comprises the step of arranging a supporting component on one surface of the lower facial tissue facing away from the coating component, wherein the supporting component comprises a smooth line or surface for supporting the back surface of the lower facial tissue, and the supporting component is used for counteracting the acting force applied on the front surface of the lower facial tissue by the coating component.
On the other hand, the step of coating the alkaline solution mixed with the methyl hydrogen-containing silicone oil on the front surface of the lower facial tissues further comprises the step of arranging a belt conveyor on one surface of the lower facial tissues facing away from the coating part, wherein the conveying surface of the belt conveyor is attached to the back surface of the lower facial tissues, the conveying speed of the belt conveyor is in the same direction and at the same speed as the linear speed of the lower facial tissues, and the width of the conveying surface of the belt conveyor is larger than that of the lower facial tissues.
Further, the step of coating the alkaline solution mixed with the methyl hydrogen silicone oil on the front surface of the lower facial tissue further comprises the steps of detecting the printed patterns on the front surface of the lower facial tissue by using a color sensor, calculating the linear speed of the lower facial tissue according to the interval time of the occurrence of the adjacent 2 printed patterns, and then adjusting the transmission speed of the belt conveyor so that the transmission speed of the belt conveyor is equal to the linear speed of the lower facial tissue.
Compared with the prior art, the application has the following beneficial effects:
The method comprises the steps of coating an alkaline solution mixed with methyl hydrogen-containing silicone oil on the front surface of lower facing paper, wherein a plurality of chemically active Si-H groups exist in the methyl hydrogen-containing silicone oil, drying the gypsum board wet board, continuously hydrolyzing water molecules evaporated from the board core and Si-H which are not hydrolyzed into Si-OH in the process of drying the gypsum board under alkaline conditions, fixing the hydrophobic groups on the front surface of the gypsum board by combining part of Si-OH with facing paper fibers, and forming a more stable-Si-O-covalent network by self-condensation, so that the hydrophobic film is formed on the front surface of the gypsum board.
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 perspective view of an applicator device according to an embodiment of the present invention;
fig. 2 is a bottom view of an applicator according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along the direction A-A of FIG. 2, and an enlarged view of a partial structure thereof;
Reference numerals in the drawings are respectively as follows:
1-lower facing paper, 11-blank area, 2-smearing part, 21-rag, 22-elastic plate, 3-spray gun, 31-electromagnetic valve, 4-servo sliding table, 5-pipeline, 6-belt conveyor and 7-color sensor.
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.
The following provides a method for preparing a hydrophobic film on the surface of a gypsum board, which comprises the following steps:
Before the gypsum board is dried, an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing paper 1, and then the gypsum board is dried.
The hydrophobic membrane is formed by the following principle:
The alkali solution can adopt potassium hydroxide, methyl hydrogen-containing silicone oil is a highly polymerized organic compound, a plurality of Si-H groups with active chemical property exist in the molecule, in the process of drying the gypsum board with paper surface under alkaline conditions, the Si-H which is not hydrolyzed and water molecules evaporated from the board core continue to hydrolyze into Si-OH, part of the Si-OH is combined with the paper surface protection fiber to fix the hydrophobic group on the front surface of the gypsum board, and the other Si-OH forms a more stable-Si-O-covalent network to cover the front surface of the gypsum board through self-polycondensation, so that the hydrophobic film on the front surface of the gypsum board is finally formed.
It can be seen that the other steps of the method for producing gypsum board do not need any modification, and only an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing paper 1 before the wet gypsum board is dried, so that the gypsum board with the hydrophobic film formed on the front surface can be obtained.
Preferably:
Before the lower facing 1 passes through the lower facing scoring machine, an alkali solution mixed with methyl hydrogen silicone oil is smeared on the front surface of the lower facing 1.
The position of the alkali solution coated with the methyl hydrogen silicone oil is selected between the lower facing paper deviation rectifying machine and the lower facing paper scoring machine of the gypsum board production line, because the alkali solution is difficult to coat at the scoring position of the lower facing paper 1, and the edge of the lower facing paper 1 of the gypsum board obtained finally is difficult to form a hydrophobic layer, so that the alkali solution needs to be coated before scoring, and the two sides of the scoring position of the lower facing paper 1 can form the hydrophobic layer.
Further, since glue needs to be applied to the top surface of the flange after the upper protective paper stands on the flange, so that the upper protective paper can be adhered to the top surface of the flange, the edges on both sides of the upper protective paper cannot be applied with an alkali solution, otherwise, the adhesion of the glue to the front surface of the lower protective paper 1 is reduced.
In the step of applying the alkali solution mixed with the methyl hydrogen silicone oil to the front surface of the lower facing paper 1, the following conditions are also required:
A blank area 11 with the width of 10 mm-15 mm is reserved on two sides of the lower facing paper 1, and an alkali solution mixed with methyl hydrogen silicone oil is smeared at the position outside the blank area 11.
Since the deviation of the lower facer 1 during the transfer may cause the position of the blank area 11 to be difficult to control, it is also necessary to define a condition that an alkali solution mixed with methyl hydrogen silicone oil is applied to the front surface of the lower facer 1 after the lower facer 1 passes through the lower facer deviation corrector.
Further, since the widths of the lower facing papers 1 of the gypsum boards of different specifications are different, it is necessary to prepare different width application devices for the lower facing papers 1 of different widths.
The application device comprises at least 2 application members 2, the application members 2 being arranged on the transport path of the lower facer paper 1 and being used for applying an alkaline solution on the front side of the lower facer paper 1;
The 2 applicator members 2 are movable in the width direction of the lower facer paper 1 so that edges of the applicator members 2 can be close to one side of the lower facer paper 1 and away from the other side of the lower facer paper 1, projections of the 2 applicator members 2 in the width direction of the lower facer paper 1 are offset from each other, and projections of the 2 applicator members 2 in the length direction of the lower facer paper 1 are partially overlapped, so that the 2 applicator members 2 can be applied from the middle of the lower facer paper 1 to one side of the lower facer paper 1, respectively, and the application is repeated in the middle of the lower facer paper 1.
If the width of the gypsum board with the largest specification is 2 times or more than the width of the gypsum board with the smallest specification, the 2 coating parts 2 are not enough to adapt to the gypsum board with any specification, and operators need to replace the coating parts 2 with different lengths to adapt to the change of the width of the gypsum board, or expand the number of the coating parts 2 to 3 or more.
When the application device comprises 3 application members 2, of which 1 application member 2 is fixed in the middle of the lower facer paper 1 and symmetrical with respect to the centre line of the lower facer paper 1, the other 2 application members 2 are located on both sides of the application member 2, respectively.
The above embodiments may also be differentiated into further embodiments, such as:
The application device comprises 3 application members 2, of which 1 application member 2 is fixed in the middle of the lower facer paper 1 and symmetrical with respect to the center line of the lower facer paper 1, and the other 2 application members 2 are located on both sides of the application member 2, respectively, each of the 2 application members 2 being movable in the width direction of the lower facer paper 1 and projections in the width direction of the lower facer paper 1 being overlapped with each other.
Thus, in many embodiments, the applicator member 2 need only fulfil the following conditions:
the entire width of the plurality of application members 2 in the width direction of the lower face guard 1 is adjustable, and the plurality of application members 2 do not interfere with each other when the entire width is adjusted.
The applicator member 2 may be a conventional means for applying a liquid to the surface of the product, such as a cloth 21, brush, roller brush, spray gun 3, etc., and the alkaline solution may be transferred quantitatively to the cloth 21, brush, roller brush or spray gun 3 through a pipe.
The following preferred technical means are adopted in this embodiment.
The smearing device comprises a spray gun 3 and a linear driver;
A plurality of spray guns 3 are arranged side by side at equal intervals along the width direction of the lower facing paper 1, each spray gun 3 is connected with an alkali solution source, and each spray gun 3 can be independently opened to spray the alkali solution to the surface of the lower facing paper 1;
The number of the linear drivers is at least 2, the 2 linear drivers are respectively connected with 1 smearing part 2, the driving direction of the linear drivers is parallel to the width direction of the lower facial tissue 1, and when the number of the smearing parts 2 is 3, the smearing part 2 positioned in the middle does not need the driving of the linear drivers.
Specifically, the linear driver adopts the servo slipway 4.
Each spray gun 3 is connected to a pipe 5 through which the alkali solution flows by means of a separate solenoid valve 31, and the alkali solution may be stored in a tank (not shown) connected to the pipe 5 and located at a high level so that the pressure inside the pipe 5 is such that the alkali solution can be sprayed through the spray gun 3.
The smearing part 2 comprises a rag 21 and an elastic plate 22, wherein the rag 21 is fixedly connected with the elastic plate 22, the connection part of the elastic plate 22 and the rag 21 is rectangular, the edge of the rag 21 exceeds the edge of the elastic plate 22, and the rag 21 always clings to the surface of the lower facial mask 1 under the rebound action of the elastic plate 22.
When the size of the gypsum board is changed, the electromagnetic valve 31 is selectively opened and closed to change the spraying width of the spray gun 3, and meanwhile, the servo sliding table 4 drives the elastic plate 22 to move, so that after the alkali solution sprayed by the spray gun 3 passes through the trowelling of the rag 21, the part except the blank area 11 on the two sides of the lower facing paper 1 is just covered.
Further, since at least 2 applicator members 2 are asymmetric with respect to the center line of the lower facer paper 1, each applicator member 2 causes the lower facer paper 1 to deflect toward one side when applying the alkaline solution to the front side of the lower facer paper 1, resulting in the lower facer paper 1 being deflected again.
To solve this problem, a device capable of preventing the applying member 2 from applying a force to bias the lower facestock 1, or a lower facestock deviation corrector (not shown) is added between the applying device and the lower facestock scoring machine.
The device for preventing the smearing part 2 from applying the acting force for offsetting the lower facial tissue 1 comprises a supporting part, wherein the supporting part is arranged on one surface of the lower facial tissue 1 facing away from the smearing part 2 and is used for supporting the back surface of the lower facial tissue 1, so that when the smearing part 2 applies the acting force to the front surface of the lower facial tissue 1, the supporting part applies the opposite acting force, and the two acting forces offset each other to avoid the offset of the lower facial tissue 1.
The supporting member may be a roller, a smooth metal plate, or the like, which does not damage the lower face guard 1 when rubbed against the back surface of the lower face guard 1.
The following preferred technical means are adopted in this embodiment.
The means for preventing the application member 2 from applying a force to the lower facer paper 1 to bias it comprises a belt conveyor 6, the conveying surface of the belt conveyor 6 being attached to the back surface of the lower facer paper 1, the conveying speed of the belt conveyor 6 being in the same direction and at the same speed as the linear speed of the lower facer paper 1, the width of the conveying surface of the belt conveyor 6 being greater than the width of the lower facer paper 1.
Further, in order to ensure that the conveyance speed of the belt conveyor 6 is the same as the linear speed of the lower face guard 1, in this embodiment, the linear speed of the lower face guard 1 is also detected by the color sensor 7, the color sensor 7 is installed between the lower face guard deviation correcting machine and the belt conveyor 6 of the belt conveyor 6, and the detection end of the color sensor 7 faces the front face of the lower face guard 1, and the color sensor 7 is used to detect the print pattern of the front face of the lower face guard 1.
The printed pattern is printed on the surface of the lower facing sheet 1 by a printing roller before passing through a deviation correcting machine, the printed pattern is usually the name, specification and batch of gypsum board manufacturer, and a color sensor 7 is usually arranged in the middle of the lower facing sheet 1 and senses that the color is black.
The controller calculates the linear velocity of the lower facing paper 1 according to the interval time of the occurrence of the adjacent 2 printing patterns, and then adjusts the transport velocity of the belt conveyor 6 so that the transport velocity of the belt conveyor 6 is equal to the linear velocity of the lower facing paper 1, and no relative movement is generated between the transport surface of the belt conveyor 6 and the lower facing paper 1, so that no relative friction is generated.
The operator may also use a photoelectric encoder for detecting the rotation speed of the roller shaft for transporting the lower facer paper 1 instead of the color sensor 7, and further calculate the linear speed of the lower facer paper 1 through the controller, but the calculation result is not accurate, and there is a problem of slipping between the lower facer paper 1 and the roller shaft.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and it is intended to be within the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for preparing a hydrophobic film on the surface of a gypsum board is characterized in that,
The method comprises the following steps of reserving 10 mm-15 mm wide blank areas on two sides of the front face of lower facing paper, spraying alkali solution containing methyl hydrogen silicone oil on the positions outside the blank areas by using a spray gun, trowelling the alkali solution attached to the front face of the lower facing paper by using smearing parts, wherein the number of the smearing parts is at least 2, a plurality of smearing parts form continuous and uninterrupted smearing areas in the width direction of the lower facing paper, the positions of at least 1 smearing part in the width direction of the lower facing paper can be adjusted to change the whole width of the smearing areas, a belt conveyor is arranged on one face of the lower facing paper, facing away from the smearing parts, of the conveying surface of the belt conveyor is attached to the back face of the lower facing paper, so that acting force exerted on the front face of the lower facing paper by the smearing parts is counteracted, the conveying speed of the belt conveyor is the same as and the linear speed of the lower facing paper, the width of the conveying surface of the belt conveyor is larger than that of the lower facing paper, and then a wet gypsum board is dried.
2. The method for preparing a hydrophobic film on the surface of a gypsum board according to claim 1, wherein,
And after the lower facing paper passes through the lower facing paper deviation corrector, smearing the alkaline solution on the front surface of the lower facing paper.
3. A method for preparing a hydrophobic film on the surface of a gypsum board according to claim 2, wherein,
The alkaline solution is smeared on the front surface of the lower facing before the lower facing passes through the lower facing scoring machine.
4. The method for preparing a hydrophobic film on the surface of a gypsum board according to claim 1, wherein,
The number of the spray guns is a plurality, the spray guns are arranged side by side at equal intervals along the width direction of the lower facing paper, and each spray gun can be independently opened or closed;
the step of spraying the alkali solution containing methyl hydrogen silicone oil at the position outside the blank area by using the spray gun comprises the steps of selectively opening part of the spray gun to enable the alkali solution sprayed on the lower facial tissue by the spray gun to avoid the blank area;
The step of trowelling the alkaline solution attached to the front side of the lower facestock using the applicator member includes adjusting the position of the applicator member to vary the overall width of the application area such that the edge of the application area conforms to the edge of the blank area.
5. A method for preparing a hydrophobic film on a surface of a gypsum board according to claim 4, wherein,
The step of spraying the alkali solution containing methyl hydrogen silicone oil at the position outside the blank area by using the spray gun further comprises the following steps:
And detecting the printed patterns on the front surface of the lower facing paper by using a color sensor, calculating the linear speed of the lower facing paper according to the interval time of the occurrence of the adjacent 2 printed patterns, and then adjusting the transmission speed of the belt conveyor so that the transmission speed of the belt conveyor is equal to the linear speed of the lower facing paper.
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| CN202410004427.2A CN117986034B (en) | 2024-01-02 | 2024-01-02 | Method for preparing hydrophobic film on surface of gypsum board |
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| CN117984411B (en) * | 2024-01-02 | 2025-06-17 | 北新建材(昆明)有限公司 | An online film-forming system for the surface of gypsum board |
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