A heat and sound insulation board based on phosphogypsum and domestic sludge and a preparation method thereof

Abstract

The application discloses a kind of based on phosphogypsum and domestic sludge heat insulation sound insulation board and preparation method thereof, comprising: inner core layer, the inner core layer is filled cavity in the length direction of being passed in it and being opened, the upper and lower surfaces of the inner core layer are uniformly provided with sound-absorbing groove one;Heat insulation sound insulation filler is filled in filled cavity;And, outer layer, it is wrapped in the outer side wall of inner core layer, the upper and lower surfaces of the outer layer are provided with sound-absorbing groove two in the position corresponding sound-absorbing groove one.The heat insulation sound insulation board prepared in the application, there are phosphogypsum and domestic sludge in the preparation raw material of outer layer and inner core layer, water in domestic sludge can be absorbed by straw powder and wood powder cooperation, so that the inside of the heat insulation sound insulation board prepared is more compact, mica powder and straw powder cooperate not only improve the bonding force between each layer of heat insulation sound insulation board, so that heat insulation sound insulation board has higher impact toughness performance, on the other hand, improve the heat preservation performance of heat insulation sound insulation board.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of phosphogypsum processing, in particular to a heat and sound insulation board based on phosphogypsum and domestic sludge and a preparation method thereof. BACKGROUND

[0002] Phosphogypsum is an industrial by-product of wet-process phosphoric acid production in phosphorus chemical enterprises, and the main component of phosphogypsum is calcium sulfate dihydrate, which is powdery and generally appears in colors such as grayish white, grayish yellow, and light green, and also contains organic phosphorus, sulfur fluoride compounds; domestic sludge is produced stably and in large quantities along with the growth of urban sewage treatment capacity. The large-scale stacking of phosphogypsum and domestic sludge not only occupies a large amount of land resources, but also pollutes the environment, so it is urgent to turn waste into treasure at the present stage.

[0003] At present, the board can be prepared from phosphogypsum and domestic sludge for use, but due to the high water content in domestic sludge, it is difficult to achieve a dense degree during the preparation of the board with phosphogypsum, resulting in poor impact toughness of the prepared board, and the prepared board cannot meet the requirements of heat and sound insulation, resulting in a low application range of the prepared board and failing to maximize resource utilization. Therefore, we propose a heat and sound insulation board based on phosphogypsum and domestic sludge and a preparation method thereof. SUMMARY

[0004] The purpose of the present application is to provide a heat and sound insulation board based on phosphogypsum and domestic sludge and a preparation method thereof to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A heat and sound insulation board based on phosphogypsum and domestic sludge, comprising:

[0007] An inner core layer, a filling cavity is provided through the length direction in the inner core layer, and sound-absorbing grooves one are uniformly provided on the upper and lower surfaces of the inner core layer;

[0008] A heat and sound insulation filler filled in the filling cavity; and

[0009] An outer layer wrapped on the outer side wall of the inner core layer, and sound-absorbing grooves two are provided on the upper and lower surfaces of the outer layer corresponding to the positions of the sound-absorbing grooves one.

[0010] Further improvement is that the preparation raw materials of the inner core layer include phosphogypsum powder 40-50 parts, domestic sludge 25-30 parts, cement 17-25 parts, polyester fiber 5-8 parts, wood powder 10-12 parts, and multifunctional additive 3-5 parts by weight;

[0011] The preparation raw materials of the outer layer include, in parts by weight, 30-45 parts of phosphogypsum powder, 15-20 parts of domestic sludge, 20-25 parts of wood powder, 15-20 parts of mica powder, 15-20 parts of straw powder and 5-10 parts of alkali.

[0012] The multifunctional additive is one or more of water reducing agent, air entraining agent, binder, water retaining agent, early strength agent, waterproof agent and thixotropic lubricant.

[0013] Further improvement lies in that the thermal insulation and sound insulation filler is aerogel thermal insulation cotton.

[0014] Further improvement lies in that the phosphogypsum powder has a mesh size of 300-700 mesh, the wood powder has a mesh size of 80-120 mesh, the mica powder has a mesh size of 60-800 mesh, and the straw powder has a mesh size of 100-140 mesh.

[0015] A preparation method of a thermal insulation and sound insulation board material, specifically comprising the following steps:

[0016] S1: dry-mixing phosphogypsum powder, domestic sludge, cement, polyester fiber, wood powder and multifunctional additive to obtain dry powder, adding water in an amount of 50-55% of the weight of the dry powder according to water-cement ratio, and uniformly stirring to obtain core layer mortar, mixing phosphogypsum powder, domestic sludge, wood powder, mica powder, straw powder and alkali to obtain outer layer mortar;

[0017] S2: sequentially injecting the core layer mortar and the outer layer mortar into a preparation mold device through a grouting equipment to obtain a semi-finished thermal insulation and sound insulation board material through the preparation mold device;

[0018] S3: taking the semi-finished thermal insulation and sound insulation board material out of the preparation mold device, and obtaining a finished thermal insulation and sound insulation board material after steam curing, drying and cooling.

[0019] Further improvement lies in that the preparation mold device in step S2 comprises a mold body, a rectangular through port penetrating through the mold body from top to bottom, two groups of conversion type mold plate assemblies symmetrically arranged in the rectangular through port from top to bottom, and two groups of side mold plates one arranged in the rectangular through port and located between the two groups of conversion type mold plate assemblies on both sides, respectively, and connected with the output ends of the telescopic equipment one arranged on both sides of the mold body, the two groups of conversion type mold plate assemblies and the two groups of side mold plates one cooperatively form a forming cavity matched with the core layer relative to one side outer wall and two groups of side mold plates one, the conversion type mold plate assemblies on top are provided with a feeding guide cylinder communicated with the forming cavity, the forming cavity is centrally and symmetrically provided with two groups of filling cavity forming plates matched with the filling cavity, and the outer ends of the filling cavity forming plates movably penetrate through the side mold plates one and the side walls of the mold body.

[0020] The opposite side of the side mold plate one of the two groups is integrally provided with a protrusion, the protrusion, the mold body and the side mold plate one are all provided with a through hole for the filling cavity forming plate to pass through, the inner wall of the rectangular through hole is provided with a movable opening for the protrusion to enter, the movable opening is coaxial with the through hole, and the movable opening and the through hole and the mold body are in communication with each other, and the top of the mold body is provided with a heat preservation and sound insulation filler feeding channel which is in communication with the through hole.

[0021] Further improvement lies in that the conversion type mold plate assembly comprises a side mold plate two in the rectangular through hole, the outer side of the side mold plate two is flush with the outer side of the mold body, the outer side of the side mold plate two is connected with a side mold plate three through a connecting frame, the side mold plate three is in the connecting frame, one end of the inner side of the connecting frame is connected with the center of one side of the connecting frame through the output end of the rotating device, the other end of the inner side of the connecting frame is connected with the center of the other side of the connecting frame through a rotating shaft, one side of the side mold plate two facing the filling cavity forming plate is uniformly provided with a sound reduction groove body one forming column matched with the sound reduction groove body one, the side of the side mold plate three away from the filling cavity forming plate is uniformly provided with a sound reduction groove body two forming column matched with the sound reduction groove body two, the sound reduction groove body one forming column and the sound reduction groove body two forming column are one-to-one corresponding, and the diameter and height of the sound reduction groove body two forming column are smaller than those of the sound reduction groove body one forming column, and the connecting frame is driven to move relative to the mold body by the telescopic device two.

[0022] Further improvement lies in that the thicknesses of the side mold plate one, the side mold plate two and the side mold plate three are the same, the length of the side mold plate two is matched with the length of the rectangular through hole, the length of the side mold plate three is greater than that of the side mold plate two, both ends of the side of the side mold plate three away from the filling cavity forming plate are provided with extension forming blocks, the thicknesses of the extension forming blocks are matched with the side mold plate one, when the side mold plate three is attached to the surface of the mold body, one end of the extension forming block away from the side mold plate three is clamped with the end of the side mold plate one moved to a preset position, and the side of the side mold plate one is attached to the inner wall of the rectangular through hole.

[0023] Further improvement lies in that the opposite ends of the two groups of filling cavity forming plates are both provided with hand wheels, the inner end of the hand wheel is connected with one end of a scale band, the other end of the scale band is wound on the outer wall of a roller, and the roller is rotatably arranged in a groove in the side wall of the mold body through a rotating shaft and a torsional spring.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] 1) The prepared heat preservation and sound insulation board adopts the mode of outer layer wrapping inner layer, and both the outer layer and the inner core layer are prepared from raw materials containing phosphogypsum and domestic sludge, the water in the domestic sludge can be absorbed by the straw powder and wood powder, so that the prepared heat preservation and sound insulation board is more compact, and the mica powder and straw powder can improve the bonding force between the layers of the heat preservation and sound insulation board, so that the heat preservation and sound insulation board has high impact toughness, and on the other hand, the heat preservation and sound insulation board has high heat preservation performance, and the straw powder has the function of humidity control after being treated with alkali;

[0026] 2) The prepared heat preservation and sound insulation board has heat preservation and sound insulation fillers, which can improve the sound insulation, heat preservation and impact toughness of the heat preservation and sound insulation board, and the heat preservation and sound insulation board has sound elimination groove one and sound elimination groove two, which can effectively eliminate sound waves, further improve the sound insulation performance and impact toughness of the heat preservation and sound insulation board, and the preparation mold device is used to prepare the heat preservation and sound insulation board, which greatly improves the preparation efficiency of the heat preservation and sound insulation board and reduces the labor intensity. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic diagram of the heat preservation and sound insulation board of the present application;

[0028] Figure 2 It is a structure schematic diagram of the preparation mold device in the present application;

[0029] Figure 3 It is an enlarged schematic diagram of A structure in the present application Figure 2

[0030] In the figure: 1, inner core layer; 2, filling cavity; 3, heat preservation and sound insulation filler; 4, sound elimination groove body one; 5, outer layer; 6, sound elimination groove body two; 7, mold main body; 8, rectangular through port; 9, side mold plate one; 10, extension equipment one; 11, movable port; 12, heat preservation and sound insulation filler feeding channel; 13, filling cavity forming plate; 14, hand wheel; 15, scale band; 16, side mold plate two; 17, sound elimination groove body one forming column; 18, forming cavity; 19, side mold plate three; 20, sound elimination groove body two forming column; 21, extension forming block; 22, connecting frame; 23, rotating equipment; 24, extension equipment two; 25, feeding guide cylinder. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] Example 1​

[0033] Please refer to the attached Figure 1 A kind of based on phosphogypsum and domestic sludge heat insulation sound insulation board, comprising: inner core layer 1, the filling cavity 2 is opened in the length direction in inner core layer 1, the upper and lower surfaces of inner core layer 1 are uniformly provided with sound-absorbing groove one 4;Heat insulation sound insulation filler 3 is filled in filling cavity 2;And, outer layer 5, the outer side wall of inner core layer 1 is wrapped, the upper and lower surfaces of outer layer 5 are provided with sound-absorbing groove two 6 in the position corresponding to sound-absorbing groove one 4.

[0034] The preparation raw material of inner core layer 1 includes phosphogypsum powder 40 parts, domestic sludge 25 parts, cement 17 parts, polyester fiber 5 parts, wood powder 10 parts and binder 3 parts by weight fraction;

[0035] The preparation raw material of outer layer 5 includes phosphogypsum powder 30 parts, domestic sludge 15 parts, wood powder 20 parts, mica powder 15 parts, straw powder 15 and alkali 5 parts by weight fraction;

[0036] The above-mentioned phosphogypsum powder is ordinary phosphogypsum powder;Domestic sludge is, for example, from the sludge accumulated at the upstream water inlet of Huangpihu in Lujiang County;Cement is portland cement;Wood powder is wood-plastic wood powder;Bonding machine is phenolic resin adhesive;Straw powder is wheat powder;Alkali is sodium hydroxide;

[0037] Heat insulation sound insulation filler 3 is aerogel insulation cotton;

[0038] The mesh number of phosphogypsum powder is 300 meshes, the mesh number of wood powder is 80 meshes, the mesh number of mica powder is 60 meshes, and the mesh number of straw powder is 100 meshes.

[0039] A kind of preparation method of heat insulation sound insulation board, specifically comprising the following steps:

[0040] S1: 40 parts of phosphogypsum powder, 25 parts of domestic sludge, 17 parts of cement, 5 parts of polyester fiber, 10 parts of wood powder and 3 parts of binder are dry mixed to obtain dry powder, 50% of the weight of dry powder is added to water according to water-cement ratio, and uniformly stirred into inner core layer mortar: 30 parts of phosphogypsum powder, 15 parts of domestic sludge, 20 parts of wood powder, 15 parts of mica powder, 15 parts of straw powder and 5 parts of alkali are uniformly mixed to obtain outer layer mortar;

[0041] S2: the inner core layer mortar and the outer layer mortar are sequentially injected into the preparation mold device by grouting equipment, and the semi-finished heat insulation sound insulation board is prepared by the preparation mold device;

[0042] S3: the semi-finished heat insulation sound insulation board is taken out from the preparation mold device, and the finished heat insulation sound insulation board is obtained after steam curing, drying and cooling.

[0043] Please refer to the attached Figure 2 -Appendix Figure 3, as preferred, the preparation mold device in step S2 in the embodiment includes a mold body 7, a rectangular through port 8 penetrating the mold body 7 up and down, two sets of conversion mold assembly symmetrically arranged in the rectangular through port 8 up and down, and two sets of side mold plate one 9 arranged in the rectangular through port 8 and respectively between the two sets of conversion mold assembly, the two sets of side mold plate one 9 are respectively connected with the output end of the telescopic equipment one 10 arranged on both sides of the mold body 7, the two sets of conversion mold assembly cooperate with the relative one side outer wall and the relative one side outer wall of the two sets of side mold plate one 9 to form a forming cavity 18 matched with the inner core layer 1, in the initial state, that is, the state shown in the figure, the inner core layer sand slurry is injected into the forming cavity 18, so that the inner core layer sand slurry is formed into the inner core layer 1 in the forming cavity 18; Figure 2

[0044] The upper conversion mold assembly is provided with a feeding guide cylinder 25 communicated with the forming cavity 18, so as to inject the sand slurry into the forming cavity 18, from the figure Figure 2 It can be seen that the feeding guide cylinder 25 penetrates the upper conversion mold assembly up and down;

[0045] The center of the forming cavity 18 is symmetrically provided with two sets of filling cavity forming plates 13 matched with the filling cavity 2, the outer end of the filling cavity forming plate 13 is movably penetrated through the side mold plate one 9 and the side wall of the mold body 7, and the filling cavity forming plate 13 is used for forming the filling cavity 2 in the inner core layer 1;

[0046] The relative one side of the two sets of side mold plate one 9 is integrally provided with a convex part, the convex part, the mold body 7 and the side mold plate one 9 are all provided with a through port for the filling cavity forming plate 13 to penetrate, the inner wall of the rectangular through port 8 is provided with a movable port 11 for the convex part to enter, the movable port 11 is coaxial with the through port, and the movable port 11, the through port and the mold body 7 are communicated with each other, so that the side mold plate one 9 can move and adjust the position in the rectangular through port 8, so as to prepare the outer layer 5 subsequently;

[0047] The top of the mold body 7 is provided with a heat preservation and sound insulation filler feeding channel 12 communicated with the through port, which is used for pouring aerogel heat preservation cotton;

[0048] As preferred, the conversion mold assembly in the embodiment includes a side mold plate two 16 in the rectangular through port 8, the outer side of the side mold plate two 16 is flush with the outer side of the mold body 7, that is, the state shown in the figure; Figure 2 The outer side of the side mold plate two 16 is connected with a side mold plate three 19 through a connecting frame, the side mold plate three 19 is in a connecting frame 22, the inner side of one end of the connecting frame 22 is connected with one side center of the connecting frame through the output end of the rotating equipment 23, the inner side of the other end of the connecting frame 22 is connected with the other side center of the connecting frame through a rotating shaft, the connecting frame can make the side mold plate two 16 or the side mold plate three 19 correspond to the rectangular through port 8 by rotating the connecting frame through the rotating equipment 23, so as to realize the preparation of the inner core layer 1 or the outer layer 5; ​

[0049] The side mold plate two 16 is uniformly provided with sound reduction groove one forming columns 17 on one side of the filling cavity forming plate 13, which are matched with the sound reduction groove one 4, so that the surface of the inner core layer 1 is formed with the sound reduction groove one 4;

[0050] The side mold plate three 19 is uniformly provided with sound reduction groove two forming columns 20 on the side away from the filling cavity forming plate 13, which are matched with the sound reduction groove two 6, so as to form the sound reduction groove two 6;

[0051] The sound reduction groove one forming columns 17 and the sound reduction groove two forming columns 20 are one-to-one corresponding, and the diameter and height of the sound reduction groove two forming columns 20 are smaller than those of the sound reduction groove one forming columns 17, and the connecting frame 22 is driven to move relative to the mold body 7 by the telescopic device two 24.

[0052] As preferred, the thicknesses of the side mold plate one 9, the side mold plate two 16 and the side mold plate three 19 in the embodiment are the same, the length of the side mold plate two 16 is matched with the length of the rectangular opening 8, the length of the side mold plate three 19 is greater than that of the side mold plate two 16, and the side mold plate three 19 is provided with an extension forming block 21 at each end of the side away from the filling cavity forming plate 13, the thickness of the extension forming block 21 is matched with that of the side mold plate one 9, when the side mold plate three 19 is attached to the surface of the mold body 7, the end of the extension forming block 21 away from the side mold plate three 19 is clamped with the end of the side mold plate one 9 moved to a preset position, the side mold plate one 9 moved to the preset position is attached to the inner wall of the rectangular opening 8, after the inner core layer 1 is formed, the side mold plate one 9 is driven to move to be attached to the inner wall of the rectangular opening 8 by the telescopic device one 10, then the connecting frame 22 is driven to move upward to a specified position by the telescopic device two 24, the connecting frame is driven to rotate by the rotating device 23, so that the side mold plate three 19 corresponds to the rectangular opening 8, then the side mold plate three 19 is attached to the mold body 7 by the telescopic device two 24, and then the outer layer 5 is prepared by injecting the outer layer mortar from the feeding guide cylinder 25.

[0053] As preferred, the opposite ends of the two groups of filling cavity forming plates 13 in the embodiment are provided with hand wheels 14, the inner ends of the hand wheels 14 are connected with one end of a scale belt 15, the other end of the scale belt 15 is wound on the outer wall of a roller, the roller is rotatably arranged in a groove on the side wall of the mold body 7 through a rotating shaft and a torsional spring, when the filling cavity forming plate 13 is moved by pulling the hand wheel 14, the scale belt 15 is also pulled, and the user can determine the position of the outer end of the filling cavity forming plate 13 according to the scale on the pulled scale belt 15.

[0054] It should be noted that the mold body 7 and the telescopic device two 24 in the preparation mold device are connected with the rack outside, which is not described in detail here.

[0055] The specific steps of preparing the preparation mold device in step S2 of the application are as follows:

[0056] S1: injecting the inner layer mortar from the feeding guide cylinder 25 into the molding cavity 18 by the grouting equipment, and the inner layer mortar is molded into the inner core layer 1 with the sound slot body one 4 and the filling cavity 2 by cooperating with the filling cavity molding plate 13 and the sound slot body one molding column 17 in the molding cavity 18;

[0057] S2: pulling the filling cavity molding plate 13 outward by the hand wheel 14 until the inner end of the filling cavity molding plate 13 is outside the thermal and sound insulation filling material feeding channel 12, and then pouring the thermal and sound insulation filling material 3 from the thermal and sound insulation filling material feeding channel 12 so that the thermal and sound insulation filling material 3 enters the through port of the mold main body 1, and then pushing the filling cavity molding plate 13 to reset, and the filling cavity molding plate 13 makes the thermal and sound insulation filling material 3 enter the filling cavity 2 through the through port of the convex part and the side mold plate one 9, and repeating the above steps until the filling cavity 2 is filled with the required thermal and sound insulation filling material 3, and then making the filling cavity molding plate 13 at the outer end of the filling cavity 2;

[0058] S3: adjusting the molding cavity 18 by driving the side mold plate one 9 to fit the inner wall of the rectangular through port 8 by the telescopic equipment one 10, driving the connecting frame to move to the preset position by the telescopic equipment two 24 and the rotating equipment 23, and then driving the side mold plate three 19 to correspond to the rectangular through port 8, and then driving the connecting frame 22 to move until the side mold plate three 19 contacts with the outer wall of the mold main body 7 (at this time, the extension molding block 21 is clamped at the end of the side mold plate one 9 to ensure the flatness of the outer layer 5), and then injecting the outer layer mortar from the feeding guide cylinder 25 by the grouting equipment;

[0059] S4: after injecting the appropriate amount of mortar, pulling the filling cavity molding plate 13 to move until the inner end of the filling cavity molding plate 13 is parallel to the inner wall of the side mold plate one 9, and then continuing to inject the outer layer mortar from the feeding guide cylinder 25 until the outer layer mortar fills the adjusted molding cavity 18, and the outer layer mortar is solidified into the outer layer 5 with the sound slot body two 6 outside the inner core layer 1, that is, the semi-finished thermal and sound insulation board is prepared.

[0060] Comparative Example 1

[0061] The difference from Example 1 is that the inner core layer 1 is a solid structure without filling the thermal and sound insulation filling material 3 inside;

[0062] Comparative Example 2

[0063] The difference from Example 1 is that the inner core layer 1 is not prepared with the sound slot body one 4, and the outer layer 5 is not prepared with the sound slot body two 6, that is, the side mold plate two 16 in the mold device is not provided with the sound slot body one molding column 17, and the side mold plate three 19 is not provided with the sound slot body two molding column 20.

[0064] Comparative Example 3

[0065] The difference between Example 1 and Comparative Example 3 is that the raw materials for preparing the outer layer 5 do not include 15 parts by weight of mica powder and 15 parts by weight of straw powder.

[0066] Performance test:

[0067] The thermal and sound insulation boards were prepared according to the method of Example 1 and Comparative Examples 1-3 above.

[0068] 1. Sound insulation performance test: A closed space was selected, and a through opening for accommodating the thermal and sound insulation board was opened at the connection between the closed space and the outdoor space. The thermal and sound insulation boards prepared in Example 1 and Comparative Examples 1-3 were sequentially sealed and installed in the through opening, and the sound pressure values in the closed space and the outdoor space after installation of the different thermal and sound insulation boards were tested by a sound pressure detector. The sound insulation performance of the thermal and sound insulation boards of Example 1 and Comparative Examples 1-3 was determined by the difference in decibels between the closed space and the outdoor space.

[0069] 2. Thermal insulation performance test: A closed space was selected, and a through opening for accommodating the thermal and sound insulation board was opened at the connection between the closed space and the outdoor space. The thermal and sound insulation boards prepared in Example 1 and Comparative Examples 1-3 were sequentially sealed and installed in the through opening, and the temperature values in the closed space and the outdoor space after installation of the different thermal and sound insulation boards were tested by a temperature detector. The thermal insulation performance of the thermal and sound insulation boards of Example 1 and Comparative Examples 1-3 was determined by the difference in temperature between the closed space and the outdoor space.

[0070] 3. The impact toughness performance of the thermal and sound insulation boards prepared in Example 1 and Comparative Examples 1-3 was tested according to the national standard GB / T 1940-2009.

[0071] The experimental results are as follows:

[0072] Sound insulation performance Thermal insulation performance Impact toughness Example 1 35 db 3℃ Excellent Comparative Example 1 25 db 6℃ Good Comparative Example 2 27 db 4℃ Good Comparative Example 3 33 db 6℃ Good

[0073] Conclusion: According to the experimental results, it can be known that the thermal insulation and sound insulation board prepared in Example 1 has higher sound insulation, thermal insulation and impact toughness performance, the thermal insulation and sound insulation board prepared in Comparative Example 1 is inferior to that of Example 1 in sound insulation, thermal insulation and impact toughness performance, because the thermal insulation and sound insulation filler 3 improves the sound insulation, thermal insulation and impact toughness performance of the thermal insulation and sound insulation board; the thermal insulation and sound insulation board prepared in Comparative Example 2 is inferior to that of Example 1 in sound insulation performance and impact toughness performance, because the sound elimination groove body one 4 and the sound elimination groove body two 6 can effectively eliminate sound waves, improve the sound insulation performance of the thermal insulation and sound insulation board, and the sound elimination groove body one 4 and the sound elimination groove body two 6 also make the inner core layer 1 and the outer layer 5 tightly combined, thereby affecting the impact toughness performance of the thermal insulation and sound insulation board; the thermal insulation and sound insulation board prepared in Comparative Example 3 is inferior to that of Example 1 in thermal insulation and impact toughness performance, because the combination of mica powder and straw powder not only improves the thermal insulation performance of the thermal insulation and sound insulation board, but also improves the bonding force between the layers of the thermal insulation and sound insulation board, so that the thermal insulation and sound insulation board has higher impact toughness performance.

[0074] While embodiments of the present application have been shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. The scope of the application is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a thermal and sound insulating board based on phosphogypsum and domestic sludge, characterized in that, The heat preservation and sound insulation board comprises: an inner core layer (1) provided with a filling cavity (2) extending through the length direction of the inner core layer (1), and uniformly provided with sound reduction groove I (4) on the upper and lower surfaces of the inner core layer (1); a heat preservation and sound insulation filler (3) filled in the filling cavity (2); and an outer layer (5) wrapped on the outer side wall of the inner core layer (1), and provided with sound reduction groove II (6) on the upper and lower surfaces of the outer layer (5) corresponding to the positions of the sound reduction groove I (4). The preparation method of the heat preservation and sound insulation board comprises the following steps: S1: dry mixing phosphogypsum powder, domestic sludge, cement, polyester fiber, wood powder and multifunctional additives to obtain dry powder, adding water in an amount of 50-55% of the weight of the dry powder according to the water-cement ratio, and uniformly stirring to obtain inner core layer mortar, mixing phosphogypsum powder, domestic sludge, wood powder, mica powder, straw powder and alkali to obtain outer layer mortar; S2: sequentially injecting the inner core layer mortar and the outer layer mortar into the preparation mold device through the grouting equipment to obtain the semi-finished heat preservation and sound insulation board through the preparation mold device; S3: taking out the semi-finished heat preservation and sound insulation board from the preparation mold device, and obtaining the finished heat preservation and sound insulation board after steam curing, drying and cooling; The preparation mold device in the step S2 comprises a mold body (7), a rectangular through port (8) extending through the mold body (7), two groups of conversion type mold plate assemblies symmetrically arranged in the rectangular through port (8), and two groups of side mold plates I (9) arranged in the rectangular through port (8) and respectively located between the two groups of conversion type mold plate assemblies, the two groups of side mold plates I (9) are respectively connected with the output ends of the telescopic equipment I (10) arranged on the two sides of the mold body (7), the two groups of conversion type mold plate assemblies and the two groups of side mold plates I (9) cooperatively form a forming cavity (18) adapted to the inner core layer (1) on one side outer wall and the other side outer wall, the conversion type mold plate assembly is provided with a feeding guide cylinder (25) communicating with the forming cavity (18), and the forming cavity (18) is symmetrically provided with two groups of filling cavity forming plates (13) adapted to the filling cavity (2), and the outer end of the filling cavity forming plate (13) movably penetrates the side wall of the side mold plate I (9) and the mold body (7); the opposite sides of the two groups of side mold plates I (9) are integrally provided with protrusions, the protrusions, the mold body (7) and the side mold plate I (9) are all provided with through ports for the filling cavity forming plate (13) to penetrate, the inner wall of the rectangular through port (8) is provided with a movable port (11) for the protrusion to enter, the movable port (11) is coaxial with the through port, and the movable port (11) communicates with the through port and the mold body (7), and the top of the mold body (7) is provided with a heat preservation and sound insulation filler feeding channel (12) communicating with the through port; The conversion template assembly includes a side template two (16) in a rectangular opening (8), the outer side of the side template two (16) is flush with the outer side of the mold body (7), the outer side of the side template two (16) is connected with a side template three (19) through a connecting frame, the side template three (19) is in a connecting frame (22), the inner side of one end of the connecting frame (22) is connected with the center of one side of the connecting frame through the output end of the rotating device (23), the inner side of the other end of the connecting frame (22) is connected with the center of the other side of the connecting frame through a rotating shaft, the side template two (16) is uniformly provided with sound slot body one forming columns (17) matched with sound slot body one (4) on the side facing the filling cavity forming plate (13), the side template three (19) is uniformly provided with sound slot body two forming columns (20) matched with sound slot body two (6) on the side away from the filling cavity forming plate (13), the sound slot body one forming columns (17) and the sound slot body two forming columns (20) correspond one-to-one, and the diameter and height of the sound slot body two forming columns (20) are smaller than those of the sound slot body one forming columns (17), and the connecting frame (22) is driven to move relative to the mold body (7) by the telescopic device two (24).

2. The method of claim 1, wherein: The preparation raw materials of the inner core layer (1) include, by weight fraction, phosphogypsum powder 40-50 parts, domestic sludge 25-30 parts, cement 17-25 parts, polyester fiber 5-8 parts, wood powder 10-12 parts, and multifunctional additive 3-5 parts; The preparation raw materials of the outer layer (5) include, by weight fraction, phosphogypsum powder 30-45 parts, domestic sludge 15-20 parts, wood powder 20-25 parts, mica powder 15-20 parts, straw powder 15-20 parts, and alkali 5-10 parts; The multifunctional additive is one or more of water reducing agent, air entraining agent, binder, water retaining agent, early strength agent, waterproof agent, and thixotropic lubricant.

3. The method of claim 1, wherein: The thermal insulation and sound insulation filler (3) is aerogel thermal insulation cotton.

4. The method of claim 1, wherein: The mesh number of the phosphogypsum powder is 300-700 meshes, the mesh number of the wood powder is 80-120 meshes, the mesh number of the mica powder is 60-800 meshes, and the mesh number of the straw powder is 100-140 meshes.

5. The method of claim 1, wherein: The thicknesses of the side template one (9), the side template two (16), and the side template three (19) are the same, the length of the side template two (16) is matched with the length of the rectangular opening (8), the length of the side template three (19) is greater than that of the side template two (16), both ends of the side of the side template three (19) away from the filling cavity forming plate (13) are provided with extension forming blocks (21), the thickness of the extension forming block (21) is matched with that of the side template one (9), when the side template three (19) is attached to the surface of the mold body (7), the end of the extension forming block (21) away from the side template three (19) is clamped with the end of the side template one (9) moved to a preset position, and the side template one (9) moved to the preset position is attached with the inner wall of the rectangular opening (8).

6. The preparation method according to claim 1, wherein: The opposite end of the filling cavity forming plate (13) of the two groups is provided with a hand wheel (14), the inner end of the hand wheel (14) is connected with one end of a scale band (15), the other end of the scale band (15) is wound on the outer wall of a roller body, and the roller body is rotatably arranged in the groove on the side wall of the mold main body (7) through a rotating shaft and a torsional spring.

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