Flame retardant heat insulating acrylic sheet and preparation method thereof

Abstract

The present invention relates to the field related to acrylic sheet materials, and in particular to a flame retardant and heat insulating acrylic sheet material and a preparation method thereof, comprising a substrate, a heat insulating coating and a flame retardant coating, the outer surface of the substrate is sprayed with a heat insulating coating for the acrylic sheet material to conduct heat and a flame retardant coating for the acrylic sheet material to retard flame, the heat insulating coating is a heat insulating spray, and the flame retardant coating is a flame retardant spray. The present invention sprays a heat insulating coating and a flame retardant coating on the surface of the substrate of the acrylic sheet material, the heat insulating coating is a heat insulating spray, and the flame retardant coating is a flame retardant spray, the heat insulating coating and the flame retardant coating have excellent heat insulating and flame retardant properties, the efficient heat insulating property can reduce heat transfer, and can slow down the speed of fire spread in the event of a fire, thereby reducing the risk of fire and improving safety.

Description

Technical Field

[0001] The present invention relates to the field related to acrylic sheets, and in particular to a flame retardant and heat insulating acrylic sheet and a preparation method thereof. Background Art

[0002] As people's living standards gradually improve, various decorative materials appear in major public places, luxury hotels, shopping malls, homes and other places. Acrylic sheets, as a new type of organic decorative material, gradually play an important role in people's daily lives. In the market, general acrylic sheets are rich in color and variety, but their strength and toughness are not high and the price is expensive. Acrylic sheets used as cabinet panels and other products are mostly filled with marble, which has high strength, but poor toughness and is bulky. At the same time, these acrylic sheets are flammable products.

[0003] The existing patent publication number is: CN211808221U, which is a flame retardant and heat-insulating acrylic sheet, including a substrate, wherein the upper and lower ends of the substrate are laminated with heat-insulating coatings, wherein the heat-insulating coatings include an aerogel layer, a glass fiber layer and a rock wool layer, wherein the inner side of the aerogel layer is laminated with the substrate, the outer side of the aerogel layer is laminated with a glass fiber layer, the outer side of the glass fiber layer is laminated with a rock wool layer, the outer side of the rock wool layer is laminated with a flame retardant coating, the flame retardant coating includes a phenolic resin layer, a flame retardant adhesive and a ceramic silicone rubber layer, the inner side of the phenolic resin layer is laminated with the rock wool layer, the outer side of the phenolic resin layer is coated with a flame retardant adhesive, and the outer side of the flame retardant adhesive is laminated with a ceramic silicone rubber layer.

[0004] The above existing patents and traditional acrylic sheets have the following problems:

[0005] The existing acrylic sheet has a simple structure, a single function, and does not have flame retardant and heat insulating properties. When encountering fire, the traditional acrylic sheet is easy to catch fire and increase the fire, increase the property loss of the user, and pose a safety hazard. Summary of the invention

[0006] Therefore, the present invention provides a flame retardant and heat insulating acrylic sheet and a preparation method thereof to solve the above technical problems.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a flame retardant and heat-insulating acrylic sheet and a preparation method thereof, comprising a substrate, a heat-insulating coating and a flame-retardant coating, the outer surface of the substrate is sprayed and covered with a heat-insulating coating for the acrylic sheet to conduct heat and a flame-retardant coating for the acrylic sheet to retard flames, the heat-insulating coating is a heat-insulating spray agent, and the flame-retardant coating is a flame-retardant spray agent.

[0008] Preferably, the thermal insulation spray agent adopts one or more combined flame retardants selected from nano-aerogel, ceramic micro-beads, carbon fiber, ceramic particles and matrix material composition, and heat reflective coating.

[0009] Preferably, the flame retardant spraying agent is a combination of one or more flame retardants selected from phosphates, bromides, chlorides, and nitrogen phosphates.

[0010] A method for preparing a flame retardant and heat insulating acrylic sheet, the specific steps are as follows:

[0011] S1. Material preparation:

[0012] S11 cleans the surface of acrylic sheet;

[0013] S12 prepare the required spraying equipment and materials;

[0014] S2. Preparation of thermal insulation spray and flame retardant spray:

[0015] S21 Place the materials of the heat insulation spray and the flame retardant spray in separate containers and stir them thoroughly;

[0016] S22 is diluted again, adding solvent in a ratio of 1:1 and 2:1, and stirring again;

[0017] S3, spray coating:

[0018] S31 uses a spraying device to evenly spray the thermal insulation spray on the surface of the acrylic sheet at a spraying distance of 20-30cm;

[0019] S32 waits for the heat insulation spray to dry before spraying the flame retardant spray;

[0020] S4. Drying and curing: Let the sprayed acrylic sheet dry and cure in a suitable environment, keeping the temperature at 50℃-120℃ and the humidity at 40%-70%, waiting for the sprayed flame retardant coating to completely dry and cure.

[0021] S5 Quality Check:

[0022] After spraying, check the quality and uniformity of the coating and make corrections and re-coating if necessary.

[0023] Preferably, the spraying device includes a supporting seat plate, a toggle mechanism, a spray nozzle, an external tube, an extension plate and an adjustment mechanism. The supporting seat plate is equipped with a toggle mechanism, a spray nozzle is installed at the front end of the toggle mechanism, the tail of the spray nozzle is connected to the external tube, an extension plate extends from the front end of the supporting seat plate, and an adjustment mechanism for installing and positioning the acrylic sheet is installed on the extension plate.

[0024] Preferably, the toggle mechanism includes a supporting outer frame, a motor 1, a rotating column, an arc frame, a sliding block, a rotating member, a positioning column, a toggle frame and an adjustment assembly, wherein the motor 1 is installed at the rear end of the supporting outer frame, a rotating column is horizontally arranged in the middle part of the supporting outer frame, one end of the rotating column is connected to the output end of the motor 1, and the other end is connected to the arc frame and the sliding block through the adjustment assembly, a sliding block is slidably connected in the arc groove of the arc frame, the front end of the sliding block is connected to the rotating member, the middle part of the rotating member is rotatably connected to the middle part of the positioning column installed at the front end of the supporting outer frame through an axle rod, a toggle frame is connected to the front middle part of the positioning column, and a spray nozzle is installed on the toggle frame.

[0025] Preferably, the adjustment assembly includes a fixed block, an electric push rod, a push handle, a sliding sleeve, a sliding column 1, an adjusting frame, a slide groove 1, a slide groove 2 and a sliding column 2. The fixed block is installed on the supporting outer frame, and an electric push rod is installed on the rear side of the fixed block. A push handle is provided on the front side of the fixed block, and the push handle is connected to the pushing end of the electric push rod. A sliding sleeve is sleeved on the outer side of the rotating column, and the sliding sleeve is slidably connected to a slide groove 1 of a frame body on one side of the adjusting frame through a sliding column 1. A slide groove 2 is provided on the frame body on the other side of the adjusting frame. A sliding column 2 slides in the slide groove 2, and the sliding column 2 is connected to the sliding block through the sliding block, and the adjusting frame is rotatably connected to the frame body protruding on the rear side of the arc frame at a right angle through an axle rod.

[0026] Preferably, an annular groove is provided on the rear side of the sliding sleeve, and the annular groove is engaged with one side of the push stem.

[0027] Preferably, the positioning mechanism includes an L-shaped mounting plate, a bogie, a transmission shaft 1, a motor 2, a support frame plate, a transmission shaft 2, a gear, a connecting plate, a connecting rod and an incomplete gear, the L-shaped mounting plate being mounted on the vertical plate body of the extension plate, one end of the bogie being rotatably connected to the L-shaped mounting plate through a transmission shaft 1, the bottom of the transmission shaft 1 being connected to the output end of the motor 2 mounted on the transverse plate body of the extension plate, a support frame plate being provided on the bogie, a transmission shaft 2 being connected to the bottom of the support frame plate, a gear being connected to the bottom of the transmission shaft 2, and a connecting plate being mounted on the connection between the transmission shaft 2 and the gear, the other end of the connecting plate being rotatably connected to one end of the connecting rod, the other end of the connecting rod being rotatably connected to the bottom of the L-shaped mounting plate, an incomplete gear being mounted at the corner of the connecting plate, and the incomplete gear being meshed with the gear.

[0028] Preferably, the support frame plate is provided with strip-shaped grooves for supporting and positioning the acrylic sheet material.

[0029] Beneficial effects of the present invention:

[0030] The present invention sprays a heat-insulating coating and a flame-retardant coating on the surface of a substrate of an acrylic sheet. The heat-insulating coating is a heat-insulating spray agent and the flame-retardant coating is a flame-retardant spray agent. The heat-insulating coating and the flame-retardant coating have excellent heat-insulating and flame-retardant properties. The efficient heat-insulating property can reduce heat transfer, slow down the speed of fire spread when a fire occurs, reduce fire risks, and improve safety.

[0031] The present invention uses a spraying device to spray the surface of an acrylic sheet, and the toggle mechanism can drive the spray nozzle to toggle the angle back and forth, so that the acrylic sheet can be sprayed evenly. At the same time, the toggle angle can be adjusted by the adjustment component in the toggle mechanism, so as to be suitable for different sheet conditions, which is more efficient, practical, simple and convenient to operate.

[0032] Furthermore, the spraying device is also provided with a positioning mechanism, which can adjust the position and direction of the installed acrylic sheet, so that the acrylic sheet can be sprayed better and the spraying efficiency and uniformity can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the present invention;

[0034] Figure 2 Schematic diagram of the decomposition of the heat-insulating coating and the flame-retardant coating of the present invention;

[0035] Figure 3 It is a schematic diagram of the structure of the spraying device of the present invention;

[0036] Figure 4 It is a structural schematic diagram of the toggle mechanism of the present invention;

[0037] Figure 5 It is a side structural schematic diagram of the toggle mechanism of the present invention;

[0038] Figure 6 It is a structural schematic diagram of the positioning mechanism of the present invention;

[0039] Figure 7 It is a side structural schematic diagram of the positioning mechanism of the present invention;

[0040] Figure 8 It is a schematic diagram of the bottom structure of the positioning mechanism of the present invention.

[0041] Among them: substrate-1, thermal insulation coating-2, flame retardant coating-3, support seat plate-4, toggle mechanism-5, spray nozzle-6, external pipe-7, extension plate-8, adjustment mechanism-9, support outer frame-51, motor-52, rotating column-53, arc frame-54, sliding block-55, rotating part-56, positioning column-57, toggle frame-58, adjustment assembly-59, fixed block-591, electric push rod-592, push handle-593, sliding sleeve-594, sliding column-595, adjustment frame-596, slide groove-597, slide groove-598, sliding column-599, L-shaped mounting plate-91, bogie-92, transmission shaft-93, motor-94, support frame plate-95, transmission shaft-96, gear-97, connecting frame plate-98, connecting rod-99, incomplete gear-910. DETAILED DESCRIPTION

[0042] In order to further explain the technical solution of the present invention, it is described in detail below through specific embodiments.

[0043] like Figure 1-2 As shown, the present invention provides a flame retardant heat-insulating acrylic sheet and a preparation method thereof, comprising a substrate 1, a heat-insulating coating 2 and a flame-retardant coating 3, the outer surface of the substrate 1 is sprayed with the heat-insulating coating 2 for the acrylic sheet to conduct heat and the flame-retardant coating 3 for the acrylic sheet to retard flame, the heat-insulating coating 2 is a heat-insulating spray agent, and the flame-retardant coating 3 is a flame-retardant spray agent;

[0044] In this embodiment, the thermal insulation spray agent uses a combination of ceramic particles and matrix materials. The ceramic microbeads can be made into a coating form and sprayed on the surface of the acrylic plate to form an insulation layer to achieve better insulation and reflection of thermal radiation. The flame retardant spray agent in this embodiment uses phosphate compounds, which can chemically react with the acrylic surface to form a protective layer to slow down the spread of flames.

[0045] The present invention provides a method for preparing a flame retardant and heat insulating acrylic sheet, and the specific steps are as follows:

[0046] S1. Material preparation:

[0047] S11 Clean the surface of the acrylic sheet. Clean the surface of the acrylic sheet to remove any dirt, grease or dust. You can use an appropriate detergent or solvent to clean it and make sure the surface is dry;

[0048] S12 prepares the required spraying equipment and materials, and first puts the prepared materials into a container and waits for stirring and mixing;

[0049] S2. Preparation of thermal insulation spray and flame retardant spray:

[0050] S21 Place the materials of the thermal insulation spray and the flame retardant spray in separate containers and stir them thoroughly to ensure that the ingredients therein are evenly mixed;

[0051] S22 is diluted again, adding solvents in a ratio of 1:1 or 2:1, and stirred evenly again to ensure that the coating reaches the appropriate viscosity and consistency for easy spraying operation;

[0052] S3, spray coating:

[0053] S31 uses a spraying device to evenly spray the thermal insulation spray on the surface of the acrylic sheet at a spraying distance of 20-30cm to prevent uneven coating thickness;

[0054] S32 Wait for the thermal insulation spray to dry before spraying the flame retardant spray; when spraying, keep the spray equipment at an appropriate distance from the surface of the plate and move at a uniform speed to ensure the consistency of the coating, maintain continuous movement, and avoid staying in the same area for too long to prevent uneven coating thickness;

[0055] S4. Drying and curing: Let the sprayed acrylic sheet dry and cure in a proper environment, keeping the temperature at 50℃-120℃ and the humidity at 40%-70%. Within this range, the coating can cure and form the expected flame retardant and heat-insulating effect. Wait for the sprayed flame retardant coating to completely dry and cure. During this period, ensure that the environmental conditions meet the required drying conditions, such as temperature and humidity.

[0056] S5 Quality Check:

[0057] After spraying, check the quality and uniformity of the coating, and make corrections and touch-ups. Make sure it covers evenly, has no defects, and has the required flame retardant properties.

[0058] like Figure 3 As shown, the spraying device of this embodiment includes a support base plate 4, a toggle mechanism 5, a spray nozzle 6, an external pipe 7, an extension plate 8 and a positioning mechanism 9. The support base plate 4 is equipped with a toggle mechanism 5, and a spray nozzle 6 is installed at the front end of the toggle mechanism 5. The tail of the spray nozzle 6 is connected to the external pipe 7, and the external pipe 7 can be connected to an external spray liquid stamping device, so that the spray liquid can be sent to the spray nozzle 6 through the external pipe 7, and then sprayed onto the acrylic sheet by the spray nozzle 6. An extension plate 8 extends from the front end of the support base plate 4, and an adjustment mechanism 9 for installing and positioning the acrylic sheet is installed on the extension plate 8;

[0059] Specifically, the toggle mechanism 5 can drive the spray nozzle 6 to toggle the angle back and forth, so that the acrylic sheet can be sprayed evenly. At the same time, the toggle angle can be adjusted by the adjustment component 59 in the toggle mechanism 5. The spray device is also provided with a positioning mechanism 9, which can adjust the position and direction of the installed acrylic sheet.

[0060] like Figure 4-5 As shown, the toggle mechanism 5 of this embodiment includes a supporting outer frame 51, a motor 52, a rotating column 53, an arc frame 54, a sliding block 55, a rotating member 56, a positioning column 57, a toggle frame 58 and an adjustment assembly 59. The motor 52 is installed at the rear end of the supporting outer frame 51, and a rotating column 53 is horizontally arranged in the middle of the supporting outer frame 51. One end of the rotating column 53 is connected to the output end of the motor 52, and the other end is connected to the arc frame 54 and the sliding block 55 through the adjustment assembly 59. The sliding block 55 is slidably connected in the arc groove of the arc frame 54. The front end of the sliding block 55 is connected to the rotating member 56. The middle part of the rotating member 56 is rotatably connected to the middle part of the positioning column 57 installed at the front end of the supporting outer frame 51 through a shaft. A toggle frame 58 is connected to the front middle part of the positioning column 57, and a spray nozzle 6 is installed on the toggle frame 58;

[0061] Specifically, after the motor 52 starts working, it drives the rotating column 53 to rotate, and then the rotating column 53 drives the arc frame 54 to rotate through the adjustment component 59. The position of the sliding block 55 in the slide groove of the arc frame 54 is adjusted by the adjustment component 59, and then the arc frame 54 can drive the rotating member 56 to deflect back and forth left and right, so that the rotating member 56 drives the positioning column 57 to rotate back and forth, and then the positioning column 57 drives the toggle frame 58 to rotate back and forth, and finally the toggle frame 58 drives the spray nozzle 6 at its upper end to rotate back and forth.

[0062] like Figure 4-5 As shown, the adjustment assembly 59 of this embodiment includes a fixed block 591, an electric push rod 592, a push handle 593, a sliding sleeve 594, a sliding column 1 595, an adjustment frame 596, a slide groove 1 597, a slide groove 2 598 and a sliding column 2 599. The fixed block 591 is installed on the supporting outer frame 51, and the electric push rod 592 is installed on the rear side of the fixed block 591. The push handle 593 is provided on the front side of the fixed block 591, and the push handle 593 and the electric push rod 592 push handle are connected. The sending end is connected, a sliding sleeve 594 is sleeved on the outer side of the rotating column 53, and the sliding sleeve 594 is slidably connected to the sliding groove 597 of one side of the frame body of the adjusting frame 596 through the sliding column 1 595. The frame body of the adjusting frame 596 is provided with a sliding groove 598 on the other side, and a sliding column 599 slides in the sliding groove 598. The sliding column 599 is connected to the sliding block 55 through the right angle of the adjusting frame 596 and the rear side protruding frame body of the arc frame 54 through the shaft.

[0063] Among them, an annular groove is provided on the rear side of the sliding sleeve 594, and the annular groove is engaged with one side of the push stem 593, and the sliding sleeve 594 is driven to move by the movement of the push stem 593;

[0064] Specifically, driven by the electric push rod 592, the push handle 593 can be driven to push, and then the push handle 593 drives the sliding sleeve 594 to slide on the rotating column 53. After the sliding sleeve 594 moves, the sliding column 1 595 slides in the sliding groove 1 597 of the adjusting frame 596, so that the adjusting frame 596 can be adjusted in angle. After the angle of the adjusting frame 596 is adjusted, the sliding column 2 599 slides in the sliding groove 2 598, and the sliding block 55 slides in the annular sliding groove of the arc frame 54 to adjust its position, so that the angle of the rotating member 56 is adjusted, thereby adjusting the rotation angle of the positioning column 57.

[0065] like Figure 6-8 As shown, the positioning mechanism 9 of this embodiment includes an L-shaped mounting plate 91, a bogie 92, a transmission shaft 1 93, a motor 2 94, a support frame plate 95, a transmission shaft 2 96, a gear 97, a connecting frame plate 98, a connecting rod 99 and an incomplete gear 910. The L-shaped mounting plate 91 is mounted on the vertical plate body of the extension plate 8, one end of the bogie 92 is rotatably connected to the L-shaped mounting plate 91 through the transmission shaft 1 93, and the bottom of the transmission shaft 1 93 is connected to the output of the motor 2 94 installed on the horizontal plate body of the extension plate 8. The bogie 92 is connected at the end, and a support frame plate 95 is provided on the bogie 92. A transmission shaft 96 is connected at the bottom of the support frame plate 95. A gear 97 is connected at the bottom of the transmission shaft 96. A connecting frame plate 98 is installed at the connection between the transmission shaft 96 and the gear 97. The other end of the connecting frame plate 98 is rotatably connected to one end of a connecting rod 99. The other end of the connecting rod 99 is rotatably connected to the bottom of the L-shaped mounting plate 91. An incomplete gear 910 is installed at the corner of the connecting frame plate 98, and the incomplete gear 910 is meshed with the gear 97.

[0066] Among them, the support frame plate 95 is provided with a strip-shaped groove for supporting and positioning the acrylic sheet; it can be used to embed and position the acrylic sheet, making it convenient for the acrylic sheet to be sprayed;

[0067] Specifically, the acrylic sheet is embedded in the strip groove on the support frame plate 95, and the motor 2 94 is driven to rotate the transmission shaft 1 93 after it works, and then the transmission shaft 1 93 drives the bogie 92 to turn. After the bogie 92 turns, it can synchronously drive the support frame plate 95 and the acrylic sheet on its upper end to turn. At the same time, when the bogie 92 turns, the incomplete gear 910 rotates to drive the gear 97 to rotate, and then the gear 97 drives the support frame plate 95 to rotate. The rotation of the support frame plate 95 drives the rotation of the acrylic sheet to achieve turning and self-rotation to adjust the position, and the connecting rod 99 is subjected to force to synchronously turn to maintain the stability of the support frame plate 95 and the acrylic sheet when turning.

[0068] The present invention provides a flame-retardant heat-insulating acrylic sheet and a preparation method thereof. A heat-insulating coating 2 and a flame-retardant coating 3 are sprayed on the surface of a substrate 1 of the acrylic sheet. The heat-insulating coating is a heat-insulating spray agent and the flame-retardant coating is a flame-retardant spray agent. The heat-insulating coating 2 and the flame-retardant coating 3 have excellent heat-insulating and flame-retardant properties. The efficient heat-insulating property can reduce heat transfer, slow down the speed of fire spread when a fire occurs, reduce the fire risk, and improve safety.

[0069] The present invention uses a spraying device to spray the surface of an acrylic sheet. The toggle mechanism 5 can drive the spray nozzle 6 to toggle the angle back and forth to the left and right, so that the acrylic sheet can be evenly sprayed. At the same time, the toggle angle can be adjusted by the adjustment component 59 in the toggle mechanism 5, so as to be suitable for different sheet conditions, which is more efficient, practical, simple and convenient to operate. The spraying device is also provided with a positioning mechanism 9, which can adjust the position and direction of the installed acrylic sheet, so that the acrylic sheet can be better sprayed and the spraying efficiency and uniformity are improved.

[0070] The above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a flame retardant and heat insulating acrylic sheet, characterized in that: The flame retardant heat-insulating acrylic sheet comprises a substrate, a heat-insulating coating and a flame-retardant coating. The outer surface of the substrate is sprayed with a heat-insulating coating for the acrylic sheet to conduct heat and a flame-retardant coating for the acrylic sheet to retardant. The heat-insulating coating is a heat-insulating spray agent, and the flame-retardant coating is a flame-retardant spray agent. The specific steps are as follows: S1. Material preparation: S11 cleans the surface of acrylic sheet; S12 prepare the required spraying equipment and materials; S2. Preparation of thermal insulation spray and flame retardant spray: S21 Place the materials of the heat insulation spray and the flame retardant spray in separate containers and stir them thoroughly; S22 is diluted again, adding solvent in a ratio of 1:1 and 2:1, and stirring again; S3, spray coating: S31 uses a spraying device to evenly spray the thermal insulation spray on the surface of the acrylic sheet at a spraying distance of 20-30cm; S32 waits for the heat insulation spray to dry before spraying the flame retardant spray; S4, Drying and curing: Let the sprayed acrylic sheet dry and cure in a suitable environment, keeping the temperature at 50°C-120°C and the humidity at 40%-70%, waiting for the sprayed flame retardant coating to completely dry and cure; S5 Quality Check: After spraying, check the quality and uniformity of the coating, and make corrections and re-coating; The spraying device comprises a support base plate, a toggle mechanism, a spray nozzle, an external tube, an extension plate and a positioning mechanism, wherein the support base plate is provided with a toggle mechanism, a spray nozzle is provided at the front end of the toggle mechanism, a tail end of the spray nozzle is connected to the external tube, an extension plate extends from the front end of the support base plate, and a positioning mechanism for installing and positioning the acrylic sheet is provided on the extension plate; The toggle mechanism comprises a supporting outer frame, a motor 1, a rotating column, an arc frame, a sliding block, a rotating member, a positioning column, a toggle frame and an adjustment assembly, wherein a motor 1 is installed at the rear end of the supporting outer frame, a rotating column is horizontally arranged in the middle of the supporting outer frame, one end of the rotating column is connected to the output end of the motor 1, and the other end is connected to the arc frame and the sliding block through the adjustment assembly, a sliding block is slidably connected in the arc groove of the arc frame, the front end of the sliding block is connected to the rotating member, the middle part of the rotating member is rotatably connected to the middle part of the positioning column installed at the front end of the supporting outer frame through a shaft rod, a toggle frame is connected to the front middle part of the positioning column, and a spray nozzle is installed on the toggle frame; The adjusting assembly comprises a fixed block, an electric push rod, a push handle, a sliding sleeve, a sliding column 1, an adjusting frame, a slide groove 1, a slide groove 2 and a sliding column 2, the fixed block is installed on the supporting outer frame, and an electric push rod is installed on the rear side of the fixed block, a push handle is provided on the front side of the fixed block, and the push handle is connected to the pushing end of the electric push rod, a sliding sleeve is sleeved on the outer side of the rotating column, and the sliding sleeve is slidably connected with a slide groove 1 of a frame body on one side of the adjusting frame through a sliding column 1, and a slide groove 2 is provided on the frame body on the other side of the adjusting frame, and a sliding column 2 slides in the slide groove 2, and the sliding column 2 is penetrated and connected to the sliding block, and the adjusting frame is rotatably connected with the protruding frame body on the rear side of the arc frame at a right angle through a shaft rod; The positioning mechanism includes an L-shaped mounting plate, a bogie, a transmission shaft 1, a motor 2, a support frame plate, a transmission shaft 2, a gear, a connecting plate, a connecting rod and an incomplete gear. The L-shaped mounting plate is installed on the vertical plate body of the extension plate, and one end of the bogie is rotatably connected to the L-shaped mounting plate through a transmission shaft 1. The bottom of the transmission shaft 1 is connected to the output end of the motor 2 installed on the transverse plate body of the extension plate. The bogie is provided with a support frame plate, and a transmission shaft 2 is connected to the bottom of the support frame plate. A gear is connected to the bottom of the transmission shaft 2, and a connecting plate is installed at the connection between the transmission shaft 2 and the gear. The other end of the connecting plate is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the bottom of the L-shaped mounting plate. An incomplete gear is installed at the corner of the connecting plate, and the incomplete gear meshes with the gear.

2. The method for preparing a flame retardant and heat insulating acrylic sheet according to claim 1, characterized in that: The heat insulation spraying agent adopts one or more combined flame retardants selected from nano aerogel, ceramic micro beads, carbon fiber, ceramic particles and matrix material composition, and heat reflective coating.

3. The method for preparing a flame retardant and heat insulating acrylic sheet according to claim 1, characterized in that: The flame retardant spraying agent adopts one or more combined flame retardants of phosphate, bromide, chloride and nitrogen phosphate.

4. The method for preparing a flame retardant and heat insulating acrylic sheet according to claim 1, characterized in that: An annular groove is arranged on the rear side of the sliding sleeve, and the annular groove is engaged with one side of the pushing stem.

5. The method for preparing a flame retardant and heat insulating acrylic sheet according to claim 1, characterized in that: The support frame plate is provided with strip-shaped notches for supporting and positioning the acrylic sheet.

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