A freeze-thaw resistant, high flexural strength concrete mortar panel and method of making the same

Abstract

The application relates to an anti-freezing and thawing, high-bending-resistant type concrete mortar panel, which is prepared by mixing cement, fine aggregate and water to obtain a concrete mortar panel base material; then, recycled PET bottle piece resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, superfine aluminum hydroxide powder, gloss improver, leveling agent and degassing agent are reacted to obtain a thermoplastic coating; the heated concrete panel base material is transferred into a fluidized bed to be powder-sucked and coated, and is subjected to plasticization and leveling and cooling to obtain the panel. Compared with a common concrete mortar base material panel, the panel has the advantages of high smoothness, excellent anti-freezing and thawing performance, excellent water resistance, high bending strength and the like, can be used in various fields such as indoor and outdoor, has good coating film flame retardation, and is provided with a thermoplastic coating, wherein the coating itself material and forming process are relatively simple, the cost is far lower than that of a thermosetting coating, and the panel has the advantages of low cost, which is a new way for high-value-added application of concrete and recycled PET bottle pieces.

Description

Technical Field

[0001] This invention relates to the field of concrete technology, specifically to a freeze-thaw resistant, high flexural strength concrete mortar panel and its preparation method. Background Technology

[0002] Furniture panels are used extensively, for example, on outdoor park benches, in homes like desks, and in laboratories. Compared to wood or foam board panels, concrete mortar panels offer several advantages, including lower cost, insect resistance, no formaldehyde release, insensitivity to water and moisture, and outdoor suitability. However, ordinary concrete mortar panels suffer from drawbacks such as relatively rough surfaces, low smoothness, insufficient toughness leading to low flexural strength, susceptibility to breakage, and inadequate freeze-thaw resistance. These limitations limit their widespread application, especially in outdoor applications like park benches in Northwest and Northeast China where high freeze-thaw resistance is crucial. my country is a major cement and concrete producer, and with the decline in the real estate market, developing new applications for cement and concrete is essential for releasing my country's cement and concrete production capacity. Furthermore, with rising living standards, the consumption of disposable mineral water and beverage bottles is increasing. Since mineral water bottles are primarily made of PET, achieving high-value recycling and reuse of PET bottle flakes remains a key research area for the industry. Summary of the Invention

[0003] To address the aforementioned problems, this invention presents a durable concrete mortar panel suitable for both indoor and outdoor use. It is made from recycled PET bottle resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightening agent, leveling agent, degassing agent, cement, water, and fine aggregate through reaction and processing. First, a concrete panel substrate is prepared. Then, a thermoplastic coating is uniformly applied using a fluidized bed coating process. High-temperature plasticizing and leveling, followed by cooling, yields a freeze-thaw resistant, high-flexural-strength concrete mortar panel. Compared to ordinary concrete mortar substrates, this panel offers advantages such as high smoothness, excellent freeze-thaw resistance, excellent water resistance, and high flexural strength. It can be used in various indoor and outdoor applications, and the coating exhibits good flame-retardant properties, providing a new avenue for high-value applications of concrete.

[0004] A freeze-thaw resistant and high flexural strength concrete mortar panel, the concrete mortar panel comprising a concrete mortar substrate and a functional coating film, the functional coating film comprising the following raw materials in parts by weight:

[0005]

[0006]

[0007] Preferably, the softening point of the brominated epoxy resin is 106-120℃; the softening point of the terpene resin is 105-112℃; the degassing agent is polyamide wax; the brightening agent is a copolymer of hexadecyl methacrylate and isooctyl acrylate; and the leveling agent is a homopolymer of butyl acrylate.

[0008] All raw materials are commercially available. For example: recycled PET bottle flake resin is produced by thoroughly washing and drying recycled PET mineral water bottles, then crushing them into particles with a length of less than 1.5 cm using a plastic crusher; low-density polyethylene resin was purchased from Daqing Petrochemical Branch of China National Petroleum Corporation; brominated epoxy resin with a softening point of 106-120℃, model KBE-3020, was purchased from Kaimei Chemical Technology (Nantong) Co., Ltd.; terpene resin with a softening point of 105-112℃, model T-110, was purchased from Shandong Dengnuo New Material Technology Co., Ltd.; ultrafine aluminum hydroxide powder with a particle size of 1000 mesh was purchased from Jinan Gongchuang Biotechnology Co., Ltd.; brightening agent, model BLSC701, was purchased from Zhejiang Shuangcai New Material Co., Ltd.; leveling agent, model K7572, was purchased from Liuan Jietongda New Material Co., Ltd.; and degassing agent, polyamide wax, model NEW-0404, was purchased from Nanjing Tianshi New Material Technology Co., Ltd.

[0009] The concrete mortar substrate for the freeze-thaw resistant and high flexural strength concrete mortar panel may include the following raw materials in parts by weight:

[0010] 10-11 parts cement;

[0011] Water 5.3-5.7 parts;

[0012] 30-33 parts of fine aggregate.

[0013] In the above-mentioned concrete mortar substrate, the cement is ordinary Portland cement, type PO 42.5; the fine aggregate is natural river sand with a fineness modulus of 2.5.

[0014] For example, the cement is ordinary Portland cement, model PO 42.5, purchased from Anhui Conch Cement Co., Ltd.; the fine aggregate is natural sand, which is ordinary natural river sand sold locally, with a fineness modulus of 2.5.

[0015] The model structure of the concrete mortar panel substrate is as follows: On both the front and back sides of the panel, there are equilateral triangular prism holes located 3-3.2 cm from the edge. The hole depth is 4-4.5 mm, the side length of the equilateral triangle is 0.8-1 cm, and the distance between the holes is 5-5.2 cm. Depending on the application, the thickness of the panel can be 5-8 cm. A schematic diagram of the substrate structure is attached. Figure 1 As shown.

[0016] The method for preparing the freeze-thaw resistant and high flexural strength concrete mortar panel is as follows: First, cement, fine aggregate and water are mixed to obtain a concrete mortar panel substrate; then, recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightening agent, leveling agent and degassing agent are reacted to obtain a thermoplastic coating; the heated concrete panel substrate is transferred to a fluidized bed for powder absorption coating, and after plasticizing, leveling and cooling, the final product is obtained.

[0017] Furthermore, the preparation method of the freeze-thaw resistant, high flexural strength concrete mortar panel includes the following steps:

[0018] A. Weigh out the dry raw materials, cement and fine aggregate according to the formula and add them to the mixer in sequence. Then add the water according to the formula and mix the mixture evenly. Vibrate the well mixed mixture to form a mold, and then cure and dry it to obtain the concrete mortar panel substrate.

[0019] B. Add the formulated amounts of recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightening agent, leveling agent, and degassing agent to the mixer and mix thoroughly and evenly.

[0020] C. Then, the uniformly mixed material is melt-extruded and compounded through a twin-screw extruder. The melt-extruded and compounded material is then pressed and cut to obtain small granular material.

[0021] D. Pour the coarsely crushed granular material into a fine grinding mill, and after grinding and sieving, obtain a thermoplastic coating with a particle size of 80-100 mesh;

[0022] E. The concrete panel substrate obtained in step A is placed in a high-temperature drying oven for heating;

[0023] F. The fully heated concrete panel substrate is quickly transferred to a fluidized bed for powder coating, then removed, plasticized and leveled, and cooled with cold air to obtain the final product.

[0024] Preferably, in step A, the mixture is stirred evenly using a stirring method of 90s low speed stirring + 50s high speed stirring + 120s stop stirring + 90s high speed stirring. The compaction and curing drying steps are as follows: the well-stirred mixture is layered and placed into the experimental mold, and the experimental mold is placed on the compaction table and compacted 120 times. After the compacted test block is cured with the mold for 24 hours, it is demolded and transferred to a standard curing room (20±2℃, relative humidity of 75%). After curing for 28 days, it is taken out and fully dried to obtain the final product.

[0025] Preferably, in step C, the screw temperature of the twin-screw extruder is 210-220℃; in step E, the temperature is set to 230-240℃, and the workpiece is placed in a high-temperature drying oven for 30-40 minutes; in step F, the film thickness is controlled at about 1mm (e.g., 0.5-1.5mm), and then it is taken out and plasticized and leveled at a temperature of 210-215℃ for 10 minutes.

[0026] For example, the method for preparing the freeze-thaw resistant, high flexural strength concrete mortar panel includes the following steps:

[0027] A. Weigh out the dry raw materials, cement and fine aggregate according to the formula and add them to the mixer in sequence. Then add the water according to the formula. Mix the mixture evenly by mixing at low speed for 90 seconds, then at high speed for 50 seconds, then stop mixing for 120 seconds, then at high speed for 90 seconds. Pour the mixed mixture into experimental molds in layers and place the molds on a vibrating table to vibrate 120 times. After the vibrated test blocks are cured in the mold for 24 hours, remove the molds and transfer the test blocks to a standard curing room (20±2℃, relative humidity of 75%). After curing for 28 days, take them out, dry them thoroughly, and set them aside for later use.

[0028] B. Add the formulated amounts of recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightening agent, leveling agent, and degassing agent to the mixer and mix thoroughly and evenly.

[0029] C. Then, the uniformly mixed material is melt-extruded and compounded through a twin-screw extruder. The melt-extruded and compounded material is then pressed and cut to obtain small granular material. The screw temperature of the twin-screw extruder is 210-220℃.

[0030] D. Pour the coarsely crushed granular material into a fine grinding mill, and after grinding and sieving, obtain a thermoplastic coating with a particle size of 80-100 mesh;

[0031] E. Send the concrete panel substrate obtained in step A into a high-temperature drying oven, set the temperature to 230-240℃, and leave the workpiece in the high-temperature drying oven for 30-40 minutes for heating.

[0032] F. Quickly transfer the fully heated concrete panel substrate to a fluidized bed for powder coating, controlling the film thickness to about 1mm. Then, remove it and allow it to plasticize and level at 210-215℃ for 10 minutes. After cooling with cold air, the coating is ready.

[0033] Beneficial effects:

[0034] This invention designs a concrete mortar panel that can be used indoors or outdoors for a long time. It is made by reacting and processing recycled PET bottle resin, low-density polyethylene resin, brominated epoxy resin, terpene resin T-110, ultrafine aluminum hydroxide powder, brightener, leveling agent, degassing agent, cement, water, and fine aggregate. Specifically, firstly, cement, fine aggregate, and water are mixed to obtain a concrete mortar panel substrate; then, recycled PET bottle resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightener, leveling agent, and degassing agent are reacted to obtain a thermoplastic coating; the heated concrete panel substrate is transferred to a fluidized bed for powder absorption coating, and after plasticizing, leveling, and cooling, the final product is obtained. The freeze-thaw resistant and high flexural strength concrete mortar panel obtained by this invention has advantages over ordinary concrete mortar substrates, including high smoothness, excellent freeze-thaw resistance, excellent water resistance, and high flexural strength. It can be used in various indoor and outdoor applications. Furthermore, the coating has good flame retardant properties and uses a thermoplastic coating, which is simpler in both material selection and molding process, resulting in significantly lower costs compared to thermosetting coatings. This low cost advantage provides a new avenue for high-value-added applications of concrete. The concrete mortar panel material has a smooth, flat surface with good adhesion, is rain resistant, has high flexural strength, and strong plasticity. The surface layer has flame retardant properties, making it suitable for indoor furniture panels or laboratory benches, or for benches in outdoor parks, lakesides, and hillside pavilions. Moreover, due to its significantly improved flexural strength and excellent freeze-thaw resistance, it is also suitable for use in colder winter regions such as Northeast and Northwest China. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the concrete mortar panel substrate structure of the present invention. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments. It should be noted that, unless otherwise specified, the embodiments and technical features described in this application can be combined with each other. It should also be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terms "comprising" or "including" and similar words used in this invention refer to elements or objects preceding the word that encompass the elements or objects listed following the word and their equivalents, without excluding other elements or objects.

[0038] All raw materials used in this invention are commercially available. Specifically: the recycled PET bottle flake resin is obtained by thoroughly washing and drying recycled PET mineral water bottles, then pulverizing them into particles with a diameter of less than 1.5 cm using a plastic pulverizer; the low-density polyethylene resin was purchased from Daqing Petrochemical Company of China National Petroleum Corporation; the brominated epoxy resin with a softening point of 106-120℃, model KBE-3020, was purchased from Kaimei Chemical Technology (Nantong) Co., Ltd.; the terpene resin with a softening point of 110℃, model T-110, was purchased from Shandong Dengnuo New Material Technology Co., Ltd.; the ultrafine aluminum hydroxide powder with a particle size of 1000 mesh was purchased from Jinan Gongchuang Biotechnology Co., Ltd.; the brightening agent, model BLC701, was purchased from Ningbo Nanhai Chemical Co., Ltd.; the leveling agent, model K7572, was purchased from Liuan Jietongda New Material Co., Ltd.; the degassing agent is polyamide wax, model NEW-0404, purchased from Nanjing Tianshi New Material Technology Co., Ltd.; and the cement is ordinary silicate cement, model PO... 42.5, purchased from Anhui Conch Cement Co., Ltd.; the fine aggregate is natural sand, which is ordinary natural river sand sold locally, with a fineness modulus of 2.5.

[0039] Example 1

[0040] A freeze-thaw resistant and high flexural strength concrete mortar panel, the concrete mortar panel comprising a concrete mortar substrate and a functional coating film, the functional coating film comprising the following raw materials in parts by weight:

[0041]

[0042] The mortar substrate comprises the following raw materials in parts by weight:

[0043] 10 parts cement;

[0044] 5.3 parts water;

[0045] 30 portions of fine aggregate.

[0046] The method for preparing the freeze-thaw resistant, high flexural strength concrete mortar panel includes the following steps:

[0047] A. Weigh out the dry raw materials, cement and fine aggregate according to the formula and add them to the mixer in sequence. Then add the water according to the formula. Mix the mixture evenly by mixing at low speed for 90 seconds, then at high speed for 50 seconds, then stop mixing for 120 seconds, then at high speed for 90 seconds. Pour the mixed mixture into experimental molds in layers and place the molds on a vibrating table to vibrate 120 times. After the vibrated test blocks are cured in the mold for 24 hours, remove the molds and transfer the test blocks to a standard curing room (20±2℃, relative humidity of 75%). After curing for 28 days, take them out, dry them thoroughly, and set them aside for later use.

[0048] B. Add the formulated amounts of recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, ultrafine aluminum hydroxide powder, brightening agent, leveling agent, and degassing agent to the mixer and mix thoroughly and evenly.

[0049] C. Then, the uniformly mixed material is melt-extruded and compounded through a twin-screw extruder. The melt-extruded and compounded material is then pressed and cut to obtain small granular material. The screw temperature of the twin-screw extruder is 220℃.

[0050] D. Pour the coarsely crushed granular material into a fine grinding mill, and after grinding and sieving, obtain a thermoplastic coating with a particle size of 100 mesh.

[0051] E. Send the concrete panel substrate obtained in step A into a high-temperature drying oven, set the temperature to 240℃, and leave the workpiece in the high-temperature drying oven for 40 minutes for heating.

[0052] F. Quickly transfer the fully heated concrete panel substrate to a fluidized bed for powder coating, controlling the film thickness to about 1mm. Then, remove it and allow it to plasticize and level at 215℃ for 10 minutes. After cooling with cold air, the final product is obtained.

[0053] Example 2

[0054] A freeze-thaw resistant and high flexural strength concrete mortar panel, the concrete mortar panel comprising a concrete mortar substrate and a functional coating film, the functional coating film comprising the following raw materials in parts by weight:

[0055]

[0056] The mortar substrate comprises the following raw materials in parts by weight:

[0057] 10 parts cement;

[0058] 5.3 parts water;

[0059] 30 portions of fine aggregate.

[0060] The preparation method is the same as in Example 1.

[0061] Example 3

[0062] A freeze-thaw resistant and high flexural strength concrete mortar panel, the concrete mortar panel comprising a concrete mortar substrate and a functional coating film, the functional coating film comprising the following raw materials in parts by weight:

[0063]

[0064]

[0065] The mortar substrate comprises the following raw materials in parts by weight:

[0066] 10 parts cement;

[0067] 5.3 parts water;

[0068] 30 portions of fine aggregate.

[0069] The preparation method is the same as in Example 1.

[0070] Example 4

[0071] A freeze-thaw resistant and high flexural strength concrete mortar panel, the concrete mortar panel comprising a concrete mortar substrate and a functional coating film, the functional coating film comprising the following raw materials in parts by weight:

[0072]

[0073]

[0074] The mortar substrate comprises the following raw materials in parts by weight:

[0075] 10 parts cement;

[0076] 5.3 parts water;

[0077] 30 portions of fine aggregate.

[0078] The preparation method is the same as in Example 1.

[0079] Comparative Example 1: A concrete mortar panel substrate of the present invention is used as a comparative example.

[0080] The mortar substrate comprises the following raw materials in parts by weight:

[0081] 10 parts cement;

[0082] 5.3 parts water;

[0083] 30 portions of fine aggregate.

[0084] Test methods: Flexural strength testing was conducted according to section 10.1 of GB / T 17671-2021 "Test Method for Strength of Cement Mortar (ISO Method)". The flame retardant properties of the coating were tested using the oxygen index method according to GB / T2406.2-2009 "Determination of Burning Behavior by Oxygen Index Method for Plastics - Part 2: Room Temperature Test". Adhesion testing was conducted according to GB / T 9286-1998 "Cross-cut Test for Paints and Varnishes". Freeze-thaw resistance testing was performed using the rapid freezing method in "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete" (GB / T50082-2009), with 100 freeze-thaw cycles, testing the surface appearance and mass loss rate.

[0085] The test results of the concrete panels prepared in the above embodiments and comparative examples are shown in Table 1 below.

[0086] Table 1 Performance Tests of Concrete Panels

[0087]

[0088]

[0089] As shown in Table 1, the concrete panels prepared by the product of this invention have a smooth and flat surface, and their flexural strength is significantly improved compared to concrete substrates, generally exceeding 15 MPa, which is far higher than the flexural strength of concrete mortar substrates (6.5 MPa). Furthermore, the coating film exhibits good flame retardant properties, with an oxygen index exceeding 32%, and the adhesion of the panel coating film is also excellent (all at level 1). The product has good water resistance; after 10 hours of immersion, the surface shows almost no change, and the water absorption is generally between 50-60 g / m³. 2 This is far lower than the water absorption of the concrete substrate, which is 968.5 g / m³. 2 The freeze-thaw resistance is also excellent; after 100 freeze-thaw cycles, the surface remains smooth and almost unchanged, with a mass loss rate of less than 0.3%, while the surface of the concrete substrate becomes severely rough and shows obvious powdering, resulting in a mass loss rate of 5.68%. The concrete mortar panel material of this invention has good comprehensive performance and uses a thermoplastic coating. Both the coating material itself and the molding process are relatively simple, and the cost is far lower than that of thermosetting coatings, giving it a cost advantage and significant market application value.

[0090] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above description is illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A freeze-thaw resistant, high flexural strength concrete mortar panel, characterized by, The concrete mortar panel comprises a concrete mortar base material and a functional coating film, the functional coating film is a thermoplastic coating, and the raw materials thereof are composed of the following components in mass parts: 12-16 parts of recycled PET bottle flake resin; 10-15 parts of low-density polyethylene resin; 7-10 parts of brominated epoxy resin; 2-3 parts of terpene resin; 3-4 parts of superfine aluminum hydroxide powder; 0.3-0.5 parts of gloss enhancer; 0.2-0.4 parts of leveling agent; 0.2-0.3 parts of degassing agent; First, the cement, fine aggregate and water are mixed to obtain the concrete mortar panel base material; then, the recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, superfine aluminum hydroxide powder, gloss enhancer, leveling agent and degassing agent are reacted to obtain the thermoplastic coating; the heated concrete panel base material is transferred to the fluidized bed for powder adsorption coating, and then plasticizing leveling, cooling are performed to obtain the product.

2. The freeze-thaw and high flexural resistance concrete mortar panel according to claim 1, wherein The recycled PET bottle flake resin is obtained by washing the recycled PET mineral water bottle thoroughly, drying, and then crushing the plastic by a plastic crusher to obtain a particle size of 1.5 cm or less; the softening point of the brominated epoxy resin is 106-120 DEG C; the softening point of the terpene resin is 105-112 DEG C; and the particle size of the superfine aluminum hydroxide powder is 1000 mesh.

3. The freeze-thaw and high flexural resistance concrete mortar panel according to claim 1, wherein The degassing agent is polyamide wax; the gloss enhancer is a copolymer of hexadecyl methacrylate and isooctyl acrylate; and the leveling agent is a homopolymer of butyl acrylate.

4. The freeze-thaw resistant and high-bending-resistance concrete mortar panel according to claim 1, wherein the concrete mortar base material of the concrete mortar panel comprises the following components in mass parts: 10-11 parts of cement; 5.3-5.7 parts of water; 30-33 parts of fine aggregate.

5. The freeze-thaw resistant and high-bending-resistance concrete mortar panel according to claim 4, wherein in the concrete mortar base material, the cement is ordinary portland cement with a type PO 42.5, and the fine aggregate is natural river sand with a fineness modulus of 2.

5. The model structure of the concrete mortar panel base material is that there are equilateral triangular prism small holes with a depth of 4-4.5 mm and a length of 0.8-1 cm on the front and back surfaces of the panel near the edges at a distance of 3-3.2 cm, and the distance between the holes is 5-5.2 cm; and the thickness of the panel is 5-8 cm. The method comprises the following steps:

6. The freeze-thaw, high flexural resistance concrete mortar panel according to any of claims 1-5, wherein, A. The dry cement and fine aggregate are weighed according to the formula, and then added into a mixer in sequence, and then water is added, and the mixture is stirred uniformly; the stirred mixture is vibrated and formed, and then cured and dried to obtain the concrete mortar panel base material; 7. The method of making a freeze-thaw, high flexural strength concrete screed panel according to any one of claims 1-6, wherein, B. The formula amount of recycled PET bottle flake resin, low-density polyethylene resin, brominated epoxy resin, terpene resin, superfine aluminum hydroxide powder, gloss enhancer, leveling agent and degassing agent are added into a mixer and mixed thoroughly; C. Then the mixed material is melt-extruded and mixed by a double-screw extruder, and then the melt-extruded and mixed material is pressed and cut to obtain small granular material; D. The coarsely crushed granular material is poured into a fine grinding machine, and then ground and sieved to obtain thermoplastic coating with a particle size of 80-100 mesh. ​ ​ E. The concrete panel substrate obtained in step A is sent into a high-temperature oven for heating; F. The fully heated concrete panel substrate to a set temperature of 230-240 DEG C is quickly transferred into a fluidized bed for powder coating, and then taken out for plasticizing and leveling, and after being cooled by cold air, the product is obtained.

8. The method for preparing freeze-thaw resistant, high flexural strength concrete mortar panels as described in claim 7, characterized in that, In step A, the mixture is stirred uniformly according to the stirring mode of low-speed stirring for 90 s + high-speed stirring for 50 s + stopping stirring for 120 s + high-speed stirring for 90 s; the compaction molding and curing drying steps are: the stirred mixture is layered into an experimental mold, the experimental mold is placed on a compaction table and compacted for 120 times; the molded test block with the mold is cured for 24 h, the mold is removed, the test block is moved into a standard curing room with a temperature of 20±2 DEG C and a relative humidity of 75%, and is cured for 28 days, then taken out, and fully dried to obtain the product.

9. The method for preparing freeze-thaw resistant, high flexural strength concrete mortar panels as described in claim 7, characterized in that, In step C, the screw temperature of the double-screw extruder is 210-220 DEG C; in step E, the set temperature is 230-240 DEG C, and the workpiece is placed in the high-temperature oven for 30 min-40 min; in step F, the film thickness is controlled to be 0.5-1.5 mm, and then taken out for plasticizing and leveling for 10 min at a temperature of 210-215 DEG C.

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