Polymer cementitious matrix reinforced composite extruded polyphenyl backsheet

Abstract

The present application relates to the technical field of building board, and proposes a polymer cement base reinforced composite extruded polystyrene backing board, which comprises, from top to bottom, a first polymer cement finishing layer, an extruded polystyrene board core layer, and a second polymer cement finishing layer; the first polymer cement finishing layer and the second polymer cement finishing layer each independently have a base reinforcing layer embedded therein; the base reinforcing layer is attached to the surface of the extruded polystyrene board core layer; the compressive strength of the backing board is greater than or equal to 350 kPa, the bending load is greater than or equal to 850 N, and the thermal conductivity is less than or equal to 0.029 W / (m•K). The above technical solution solves the problem of poor strength performance of the composite extruded polystyrene backing board in the related art.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a polymer cement-reinforced composite extruded polystyrene backing board. Background Technology

[0002] Backing panels, as an important component of building insulation, decoration and structural support systems, are widely used in building curtain wall backing, exterior wall insulation and decoration, interior partitions, cold storage insulation and various component support applications.

[0003] Currently, common backing boards mainly include pure extruded polystyrene (XPS) boards and cement-based composite boards. Among them, XPS boards, due to their closed-cell foam structure, have advantages such as low thermal conductivity, good moisture resistance, and light weight. However, their low surface strength and poor bending resistance make them prone to indentation and damage during construction or use, limiting their application as structural support materials. In contrast, while traditional cement-based composite boards possess higher compressive strength, they suffer from problems such as heavy weight, poor thermal insulation performance, susceptibility to cracking, and weak bonding with the insulation core layer, making it difficult to balance thermal insulation and mechanical properties.

[0004] To improve the strength of extruded polystyrene (XPS) boards, researchers attempted to laminate a cement mortar layer onto their surface. However, the interfacial bond between ordinary cement mortar and XPS boards is weak, and drying shrinkage stress is easily generated during curing, leading to cracking and peeling of the plaster layer, resulting in limited improvement in overall strength. To optimize the poor bonding between cement mortar and XPS boards, researchers further attempted to adjust the component ratio of the cement mortar, but the overall structural compatibility and synergistic effect remained unsatisfactory. The boards were prone to warping and deformation under varying temperature and humidity conditions, exhibiting poor dimensional stability and failing to meet the stringent requirements for backing boards in construction projects.

[0005] Therefore, proposing a composite extruded polystyrene backing board with excellent strength performance is of great significance for extending its service life and meeting practical application requirements. Summary of the Invention

[0006] This invention proposes a polymer cement-based reinforced composite extruded polystyrene backing board, which solves the problem of poor strength performance of composite extruded polystyrene backing boards in related technologies.

[0007] The specific technical solution of the present invention is as follows: According to one aspect of the present invention, a polymer cement-reinforced composite extruded polystyrene backing board is provided, comprising, from top to bottom, a first polymer cement plastering layer, an extruded polystyrene board core layer, and a second polymer cement plastering layer. The first polymer cement plaster layer and the second polymer cement plaster layer each have an independently embedded base reinforcement layer. The base reinforcement layer is bonded to the surface of the extruded polystyrene board core layer; The backing plate has a compressive strength ≥350kPa, a bending load ≥850N, and a thermal conductivity ≤0.029 W / (m•K).

[0008] In the above technical solution, the thickness of the first polymer cement plaster layer and the second polymer cement plaster layer are each independently 2~6mm; The thickness of the extruded polystyrene board core layer is 8~50mm.

[0009] In the above technical solution, the base reinforcement layer includes one of alkali-resistant glass fiber mesh and polyester fiber nonwoven fabric.

[0010] In the above technical solution, the raw materials of the first polymer cement plaster layer and the second polymer cement plaster layer each independently include the following components in parts by weight: 45-65 parts cement, 25-45 parts quartz sand, 3-8 parts redispersible latex powder, 0.5-2.4 parts poly-α-methylstyrene resin, 0.2-1 parts additives, and 18-28 parts water.

[0011] In the above technical solution, the weight ratio of the redispersible latex powder to the poly-α-methylstyrene resin is 3~4:1.

[0012] In the above technical solution, the redispersible latex powder includes one or both of VAE-type redispersible latex powder and acrylic redispersible latex powder.

[0013] In the above technical solution, the raw materials of the first polymer cement plastering layer and the second polymer cement plastering layer also include 5-8 parts of microsilica powder and 0.5-1.5 parts of water-based fluorocarbon emulsion.

[0014] In the above technical solution, the additives include 0.1 to 0.6 parts of water-retaining agent and 0.1 to 0.4 parts of early-strength agent.

[0015] In the above technical solution, the first polymer cement plastering layer is obtained by the first polymer cement plastering mortar; The second polymer cement plaster layer is obtained by second polymer cement plaster mortar; The preparation methods of both the first polymer cement plastering mortar and the second polymer cement plastering mortar include the following steps: The aqueous fluorocarbon emulsion is added to water, the silica powder is added, mixed, and dried to obtain composite silica powder; the redispersible latex powder and the poly-α-methylstyrene resin are blended, ball-milled, dispersed in water, the composite silica powder is added, and mixed once; cement, quartz sand and additives are added, and mixed a second time to obtain the first polymer cement plastering mortar or the second polymer cement plastering mortar.

[0016] According to another aspect of the present invention, the present invention also provides a method for preparing the above-mentioned polymer cement-based reinforced composite extruded polystyrene backing board, comprising the following steps: S1. After applying an interface agent to the upper surface of the extruded polystyrene board core layer, apply the first polymer cement plastering mortar, lay the base reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer to obtain a backing board semi-finished product. S2. After applying an interface agent to the lower surface of the extruded polystyrene board core layer in the semi-finished backing board, apply the second polymer cement plastering mortar, lay the base reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0017] The beneficial effects of this invention are as follows: 1. In this invention, the polymer cement-reinforced composite extruded polystyrene backing board comprises, from top to bottom, a first polymer cement finishing layer, an extruded polystyrene board core layer, and a second polymer cement finishing layer. The polymer cement finishing layer uses cement as the main gelling material, which can give the polymer cement finishing layer good strength performance. At the same time, it has good bonding with the extruded polystyrene board core layer, making it the outermost layer of the backing board, providing basic compressive strength for the backing board, and protecting the internal structure of the backing board from the influence of moisture and external friction in the external environment. The extruded polystyrene board core layer uses flame-retardant extruded polystyrene foam, which utilizes its closed-cell foam structure to achieve efficient heat insulation, moisture resistance, and lightweight characteristics, reducing the overall weight of the board. The base reinforcement layer is embedded inside the polymer cement finishing layer, which utilizes its high tensile strength to offset the drying shrinkage stress of the cement finishing layer, effectively preventing cracking and damage of the finishing layer, and improving the overall strength performance of the backing board.

[0018] 2. The polymer cement-based reinforced composite extruded polystyrene backing board of this invention adopts a double-sided symmetrical composite structure, which can ensure the balanced stress on the backing board, thereby helping to improve dimensional stability and avoid warping deformation caused by temperature and humidity changes. This gives the backing board good thermal insulation performance, as well as good dimensional stability and strength performance. The compressive strength of the backing board is ≥350kPa, the bending load is ≥850N, the thermal conductivity is ≤0.029 W / (m•K), and the dimensional stability is ≤0.2%. All performances meet the standards for use in building engineering. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the backing plate structure of the present invention; In the diagram: 1-polymer cement plastering layer, 2-reinforcing layer bonded to the surface of the extruded polystyrene board core layer, 3-extruded polystyrene board core layer. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention more apparent, the invention is described in detail below. It should be understood that the invention is not limited to the description herein.

[0022] cement The cement used in this invention is any cement known in the art for use in plastering mortar, and this invention is not limited to the cements listed below. For example, the cement can be PO42.5 silicate cement, PO42.5R silicate cement, and preferably PO42.5 silicate cement. In this invention, PO42.5 silicate cement serves as the main gelling material in the plastering mortar. It undergoes a hydration reaction with water to form a gel with strength and adhesion, firmly binding other components together. This imparts strength, hardness, and durability to the polymer cement plastering layer, enabling it to withstand certain external forces and ensuring structural stability during long-term use.

[0023] In this invention, the amount of cement used is 45 to 65 parts, preferably 50 to 55 parts.

[0024] Quartz sand In this invention, the addition of quartz sand can improve the strength, wear resistance, and impact resistance of the polymer cement plaster layer, and reduce the occurrence of shrinkage cracks in the polymer cement plaster layer during curing and use. In this invention, the average particle size of the quartz sand is 0.3~0.7mm, and the average particle size can be any value from 0.3mm, 0.4mm, 0.5mm, 0.6mm, and 0.7mm, or any range between any two values, preferably 0.3~0.6mm, and more preferably 0.4mm.

[0025] In this invention, the amount of quartz sand used is 25 to 45 parts, preferably 30 to 35 parts.

[0026] Redispersible latex powder The redispersible latex powder used in this invention is a known redispersible latex powder in the art that can be used in plastering mortar, and this invention is not limited to the redispersible latex powders listed below. As an example, the redispersible latex powder can be VAE-type redispersible latex powder, acrylic redispersible latex powder, styrene-acrylic rubber powder, or an ethylene-vinyl chloride-vinyl laurate terpolymer, preferably VAE-type redispersible latex powder or acrylic redispersible latex powder, and more preferably VAE-type redispersible latex powder. In this invention, VAE-type redispersible latex powder has advantages such as ease of use and strong reducibility. During cement hydration, adding VAE-type redispersible latex powder allows it to disperse in the cement mortar, forming a polymer emulsion with certain adhesive properties. Subsequently, during the curing and drying process, it forms a film, encapsulating the aggregates in the cement mortar and improving the density of the cement mortar.

[0027] In this invention, VAE-type redispersible latex powder redisperses in cement mortar upon contact with water to form a polymer emulsion. After coagulation into a film, it fills the gaps between the aggregates in the cement mortar. This process enhances the crack resistance of the polymer cement plaster layer, but limits the improvement of the elastic modulus of the cement mortar, thus limiting the final improvement in the strength performance of the polymer cement plaster layer. Poly(α-methylstyrene) resin appears as white granules and is commonly used for tackifying and modifying rubber materials. However, in this invention, the applicant has creatively discovered that when VAE-type redispersible latex powder is added to polymer cement plaster mortar, poly(α-methylstyrene) resin is also added simultaneously. Through the combined use of VAE-type redispersible latex powder and poly(α-methylstyrene) resin, the pores of the cement mortar aggregates are filled, resulting in a denser structure of the polymer cement plaster layer. This allows it to better withstand pressure and improve the strength performance of the polymer cement plaster layer, ultimately improving the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board, achieving a compressive strength ≥350 kPa and a flexural load ≥850 N.

[0028] In this invention, by optimizing the ratio of VAE-type redispersible latex powder to polyα-methylstyrene resin, the strength performance of polymer cement-reinforced composite extruded polystyrene backing board can be further improved when the weight ratio of redispersible latex powder to polyα-methylstyrene resin is 3~4:1.

[0029] Microsilica powder, water-based fluorocarbon emulsion This invention incorporates microsilica powder and water-based fluorocarbon emulsion into the polymer cement plastering mortar. By first treating the microsilica powder with the water-based fluorocarbon emulsion before adding it to the polymer cement plastering mortar, the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board can be further improved. The presumed reason is that while VAE-type redispersible latex powder and polyα-methylstyrene resin can play a certain role in aggregate filling and bonding, their presence also has a certain air-entraining effect, creating some small, continuous pores in the polymer cement plastering layer. The addition of microsilica powder treated with water-based fluorocarbon emulsion can further reduce the porosity of the polymer-containing cement aggregate, thereby further improving the density of the polymer cement plastering layer and ultimately enhancing the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board.

[0030] Water-retaining agent The water-retaining agent used in this invention is a known water-retaining agent in the art that can be used in plastering mortar, and this invention is not limited to the water-retaining agents listed below. As an example, the water-retaining agent can be a cellulose ether water-retaining agent or a starch ether water-retaining agent, preferably a cellulose ether water-retaining agent. Cellulose ether water-retaining agents can be, for example, hydroxypropyl methylcellulose, hydroxyethyl cellulose, methylcellulose, or hydroxyethyl methylcellulose, preferably hydroxypropyl methylcellulose. In this invention, the addition of the water-retaining agent can slow down the rate of water evaporation, allowing the mortar to maintain sufficient humidity for a longer period of time, providing the necessary conditions for the hydration reaction of cement.

[0031] In this invention, the amount of water-retaining agent is 0.1 to 0.6 parts, preferably 0.3 to 0.4 parts.

[0032] Early strength agent The accelerator used in this invention is a known accelerator for use in plastering mortar, and this invention is not limited to the accelerators listed below. As an example, the accelerator can be calcium formate, calcium chloride, or triethanolamine, preferably calcium formate. In this invention, the calcium formate accelerator can accelerate the hydration reaction of cement, shorten the gel time of cement mortar, and at the same time, in the early stage of cement hydration, calcium formate can promote the production of more hydration products, thereby making the structure of cement mortar more compact. As the hydration reaction continues, this structure is continuously strengthened, which helps to improve the early strength of cement mortar.

[0033] In this invention, the amount of early strength agent is 0.1 to 0.4 parts, preferably 0.2 to 0.3 parts.

[0034] First polymer cement plaster layer, second polymer cement plaster layer In this invention, the outermost layer of the polymer cement-reinforced composite extruded polystyrene backing board is a polymer cement plaster layer, which is obtained by polymer cement plastering mortar. The polymer cement plastering mortar uses cement as a gelling material and combines it with quartz sand, redispersible latex powder, polyα-methylstyrene resin, water-retaining agent, early-strength agent, and water. This results in a product with strong adhesion, good flexibility, and resistance to crumbling. The detached polymer cement plaster layer has good surface adhesion to the core layer of the extruded polystyrene board, thereby effectively improving the overall stability of the polymer cement-reinforced composite extruded polystyrene backing board.

[0035] In this invention, the thickness of the first polymer cement plaster layer or the second polymer cement plaster layer is 2 to 6 mm, for example, it can be any point value among 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm and the range between any two point values, preferably 3 to 4 mm.

[0036] Extruded polystyrene board core layer In this invention, the polymer cement-reinforced composite extruded polystyrene backing board core layer is an extruded polystyrene board core layer, which is made of flame-retardant extruded polystyrene foam board with a board density of 32~55 kg / m³. 3 The compressive strength is ≥280kPa, the thermal conductivity is ≤0.030W / (m•K), and the thickness is set to 8~50mm according to construction requirements. It has the properties of being lightweight, heat-insulating and compressive-resistant. The thickness can be any value or range between any two values ​​from 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, to 50mm, preferably 15~25mm.

[0037] Tire base reinforcement layer The reinforcing layer used in this invention is a known reinforcing layer in the art that can be used for backing boards, and this invention is not limited to the reinforcing layers listed below. As an example, the reinforcing layer can be alkali-resistant glass fiber mesh or polyester nonwoven fabric, preferably alkali-resistant glass fiber mesh. In this invention, the alkali-resistant glass fiber mesh has a mesh count of 10-18 mesh and a tensile strength ≥750N / 50mm, which can effectively inhibit the drying shrinkage cracking of the polymer cement plaster layer and improve the bending and impact resistance of the plaster layer.

[0038] Preparation methods of first polymer cement plastering mortar and second polymer cement plastering mortar The present invention also provides a method for preparing the first polymer cement plastering mortar or the second polymer cement plastering mortar as described above, comprising the following steps: Redispersible latex powder and poly-α-methylstyrene resin are blended, ball-milled, dispersed in water, and mixed once. Cement, quartz sand and additives are added, and the mixture is mixed a second time to obtain either the first polymer cement plastering mortar or the second polymer cement plastering mortar.

[0039] In the preparation of the first or second polymer cement plastering mortar in this invention, redispersible latex powder and poly-α-methylstyrene resin are first premixed by ball milling at 200-300 rpm for 10 minutes. Then, water is added, and the mixture is stirred at 300-400 rpm for 20-30 minutes. Finally, the remaining components of the polymer cement plastering mortar are added, and the mixture is stirred at 300-400 rpm for 30-40 minutes to obtain the first or second polymer cement plastering mortar. This invention, by adding the components step-by-step during the preparation of the polymer cement plastering mortar, results in a more uniform and stable polymer cement plastering mortar.

[0040] The present invention also provides a method for preparing the first polymer cement plastering mortar or the second polymer cement plastering mortar as described above, comprising the following steps: Aqueous fluorocarbon emulsion is added to water, silica fume is added, mixed, and dried to obtain composite silica fume; redispersible latex powder and poly-α-methylstyrene resin are blended, ball-milled, dispersed in water, composite silica fume is added, and mixed once; cement, quartz sand and additives are added, and mixed twice to obtain first polymer cement plastering mortar and second polymer cement plastering mortar.

[0041] In this invention, when the first polymer cement plastering mortar or the second polymer cement plastering mortar also includes silica fume and water-based fluorocarbon emulsion, the silica fume is first pretreated with water-based fluorocarbon emulsion to obtain composite silica fume. During the process of obtaining composite silica fume, after the mixture of water-based fluorocarbon emulsion and silica fume is dried, it needs to be pulverized to obtain composite silica fume with an average particle size of 5-30 μm. The average particle size can be any value from 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, and 30 μm, or any range between any two values, preferably 10-20 μm, and more preferably 15 μm. In this invention, the pretreatment of silica fume with water-based fluorocarbon emulsion to obtain composite silica fume, followed by mixing it with the remaining components, can better improve the dispersion of silica fume in the cement mortar system, thereby better improving the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board.

[0042] Preparation method of polymer cement-reinforced composite extruded polystyrene backing board The present invention also provides a method for preparing the above-mentioned polymer cement-based reinforced composite extruded polystyrene backing board, comprising the following steps: S1. After applying an interface agent to the upper surface of the extruded polystyrene board core layer, apply the first polymer cement plastering mortar, lay the base reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer to obtain the backing board semi-finished product. S2. After applying an interface agent to the lower surface of the extruded polystyrene board core layer in the semi-finished backing board, apply the second polymer cement plastering mortar, lay the base reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer to obtain a polymer cement base reinforced composite extruded polystyrene backing board.

[0043] In this invention, when applying the first polymer cement plastering mortar or the second polymer cement plastering mortar to the surface of the extruded polystyrene board core layer, an interface agent needs to be applied to the surface of the extruded polystyrene board core layer to help the polymer cement plastering mortar adhere better. The interface agent used in this invention is an interface agent known in the art that can be used for backing boards, and this invention is not limited to the interface agents listed below. As an example, the interface agent can be an acrylic emulsion, a vinyl acetate-ethylene copolymer emulsion, preferably a vinyl acetate-ethylene copolymer emulsion.

[0044] In this invention, the amount of interface agent used is 0.1~0.4 kg / m³. 2 For example, it could be 0.1 kg / m 2 0.2kg / m 2 0.3kg / m 2 0.4kg / m 2 The preferred value is 0.3 kg / m 2 .

[0045] The polymer cement-based reinforced composite extruded polystyrene backing board obtained by this invention can be directly cut and installed without additional protective treatment, resulting in high construction efficiency. The material is environmentally friendly and odorless, meeting the requirements for building energy conservation and environmental protection. It can also be widely used in building curtain wall backing, exterior wall insulation and decoration, interior partitions, cold storage insulation, and various component support scenarios, demonstrating strong versatility.

[0046] To further illustrate the present invention, detailed descriptions will be provided below through the following embodiments. The raw materials used in the following embodiments and comparative examples of the present invention are all commercially available products. Specifically, the silicate cement is PO42.5 silicate cement; the average particle size of the quartz sand is 0.4 mm; the VAE-type redispersible latex powder is model 5010N; the polya-methylstyrene resin is model AMS-110; the viscosity of hydroxypropyl methylcellulose is 150,000 mPa·s; the waterborne fluorocarbon emulsion is model CF-801; the acrylic redispersible latex powder is model HD2000; the average particle size of the microsilica powder is 40 μm; and the vinyl acetate-ethylene copolymer emulsion has a solid content of 58% and a viscosity of 2300 mPa. s.

[0047] Example 1 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. Mix 3 parts of VAE-type redispersible latex powder and 2.4 parts of poly-α-methylstyrene resin, ball mill at 200 rpm for 10 min, disperse in 18 parts of water, stir at 300 rpm for 30 min, add 45 parts of silicate cement, 25 parts of quartz sand, 0.1 parts of hydroxypropyl methylcellulose and 0.1 parts of calcium formate, stir at 300 rpm for 40 min to obtain the first polymer cement plastering mortar; S02. Mix 3 parts of VAE-type redispersible latex powder and 0.5 parts of poly-α-methylstyrene resin, ball mill at 200 rpm for 10 min, disperse in 18 parts of water, stir at 300 rpm for 30 min, add 45 parts of silicate cement, 25 parts of quartz sand, 0.1 parts of hydroxypropyl methylcellulose and 0.1 parts of calcium formate, stir at 300 rpm for 40 min to obtain the second polymer cement plastering mortar; S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 8mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 10-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 2mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2After that, apply the above-mentioned second polymer cement plastering mortar, lay the 10-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 2mm) is flat. Cure it at 25℃ for 7 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0048] Example 2 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. 5.6 parts of VAE-type redispersible latex powder and 2.4 parts of poly-α-methylstyrene resin are mixed and ball-milled at 300 rpm for 10 min. The mixture is then dispersed in 22 parts of water and stirred at 400 rpm for 20 min. 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate are added and stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S02. 5.6 parts of VAE-type redispersible latex powder and 2.4 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 22 parts of water and stirred at 400 rpm for 20 min. 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added and stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 15mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 3mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2After that, apply the above-mentioned second polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 3mm) is flat. Cure it at 25℃ for 10 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0049] Example 3 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. 5.6 parts of VAE-type redispersible latex powder and 2.4 parts of poly-α-methylstyrene resin are mixed and ball-milled at 300 rpm for 10 min. The mixture is then dispersed in 25 parts of water and stirred at 400 rpm for 20 min. 55 parts of silicate cement, 30 parts of quartz sand, 0.4 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate are added and stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S02. 5.6 parts of VAE-type redispersible latex powder and 2.4 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 25 parts of water and stirred at 400 rpm for 20 min. 55 parts of silicate cement, 30 parts of quartz sand, 0.4 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added and stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 25mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (dosage 0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 4mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2After that, apply the above-mentioned second polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 4mm) is flat. Cure it at 25℃ for 12 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0050] Example 4 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. Mix 8 parts of VAE-type redispersible latex powder and 0.5 parts of poly-α-methylstyrene resin, ball mill at 300 rpm for 10 min, disperse in 28 parts of water, stir at 400 rpm for 20 min, add 65 parts of silicate cement, 45 parts of quartz sand, 0.6 parts of hydroxypropyl methylcellulose and 0.4 parts of calcium formate, stir at 400 rpm for 30 min to obtain the first polymer cement plastering mortar; S02. Mix 8 parts of VAE-type redispersible latex powder and 0.5 parts of poly-α-methylstyrene resin, ball mill at 300 rpm for 10 min, disperse in 28 parts of water, stir at 400 rpm for 20 min, add 65 parts of silicate cement, 45 parts of quartz sand, 0.6 parts of hydroxypropyl methylcellulose and 0.4 parts of calcium formate, stir at 400 rpm for 30 min to obtain the first polymer cement plastering mortar; S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 50mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 18-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 6mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2After that, apply the above-mentioned second polymer cement plastering mortar, lay the 18-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 6mm) is flat. Cure it at 25℃ for 14 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0051] Example 5 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, 7 parts of VAE-type redispersible latex powder and 1 part of polya-methylstyrene resin were added. The rest are the same as in Example 2.

[0052] Example 6 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, 6 parts of VAE-type redispersible latex powder and 2 parts of polya-methylstyrene resin were added. The rest are the same as in Example 2.

[0053] Example 7 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, the amount of VAE-type redispersible latex powder added is 6.4 parts and the amount of polya-methylstyrene resin added is 1.6 parts. The rest are the same as in Example 2.

[0054] Example 8 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 22 parts of water, and 6 parts of silica fume were added. The mixture was stirred at 400 rpm for 20 min. 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added. The mixture was stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S02. 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 22 parts of water, and 6 parts of silica fume were added. The mixture was stirred at 400 rpm for 20 min. 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added. The mixture was stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 15mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 3mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2 After that, apply the above-mentioned second polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 3mm) is flat. Cure it at 25℃ for 10 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0055] Example 9 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. Add 0.5 parts of waterborne fluorocarbon emulsion to 15 parts of water, add 6 parts of silica fume, stir at 400 rpm for 20 min, dry, and pulverize to obtain composite silica fume with an average particle size of 15 μm; mix 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin, ball mill at 300 rpm for 10 min, disperse in 22 parts of water, add the above composite silica fume, stir at 400 rpm for 20 min, add 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate, stir at 400 rpm for 30 min to obtain the first polymer cement plastering mortar; S02. Add 0.5 parts of waterborne fluorocarbon emulsion to 15 parts of water, add 6 parts of silica fume, stir at 400 rpm for 20 min, dry, and pulverize to obtain composite silica fume with an average particle size of 15 μm; mix 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin, ball mill at 300 rpm for 10 min, disperse in 22 parts of water, add the above composite silica fume, stir at 400 rpm for 20 min, add 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate, stir at 400 rpm for 30 min to obtain the first polymer cement plastering mortar; S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 15mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 3mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2 After that, apply the above-mentioned second polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 3mm) is flat. Cure it at 25℃ for 10 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0056] Example 10 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, 1 part of water-based fluorocarbon emulsion and 6 parts of microsilica powder were added. The rest are the same as in Example 9.

[0057] Example 11 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, 1.5 parts of water-based fluorocarbon emulsion and 6 parts of microsilica powder were added. The rest are the same as in Example 9.

[0058] Example 12 In the preparation of the first polymer cement plastering mortar and the second polymer cement plastering mortar in this embodiment, 1.5 parts of water-based fluorocarbon emulsion and 8 parts of microsilica powder were added. The rest are the same as in Example 9.

[0059] Example 13 A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board includes the following steps: S01. 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 22 parts of water, and 0.5 parts of waterborne fluorocarbon emulsion and 6 parts of microsilica powder were added. The mixture was stirred at 400 rpm for 20 min. Then, 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added. The mixture was stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S02. 6.4 parts of VAE-type redispersible latex powder and 1.6 parts of poly-α-methylstyrene resin were mixed and ball-milled at 300 rpm for 10 min. The mixture was then dispersed in 22 parts of water, and 0.5 parts of waterborne fluorocarbon emulsion and 6 parts of microsilica powder were added. The mixture was stirred at 400 rpm for 20 min. Then, 50 parts of silicate cement, 35 parts of quartz sand, 0.3 parts of hydroxypropyl methylcellulose and 0.2 parts of calcium formate were added. The mixture was stirred at 400 rpm for 30 min to obtain the first polymer cement plastering mortar. S1. After cutting the extruded polystyrene board core layer to the preset specifications (thickness 15mm), clean the surface dust and impurities, and apply vinyl acetate-ethylene copolymer emulsion (0.3kg / m²) to the upper surface of the extruded polystyrene board core layer. 2 After that, let it stand and dry at room temperature, apply the above-mentioned first polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the first polymer cement plastering layer (thickness is 3mm) is flat, and obtain the backing board semi-finished product; S2. Apply a vinyl acetate-ethylene copolymer emulsion (at a rate of 0.3 kg / m²) to the lower surface of the extruded polystyrene core layer in the above-mentioned backing board semi-finished product. 2 After that, apply the above-mentioned second polymer cement plastering mortar, lay the 12-mesh alkali-resistant glass fiber mesh reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer. Scrape and compact it to ensure that the surface of the second polymer cement plastering layer (thickness is 3mm) is flat. Cure it at 25℃ for 10 days to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

[0060] Comparative Example 1 In the preparation of the first and second polymer cement plastering mortars in this comparative example, polya-methylstyrene resin was replaced with an equal amount of VAE-type redispersible latex powder. The rest are the same as in Example 2.

[0061] Comparative Example 2 In the preparation of the first and second polymer cement plastering mortars in this comparative example, VAE-type redispersible latex powder was replaced with an equal amount of polya-methylstyrene resin. The rest are the same as in Example 2.

[0062] Comparative Example 3 In the preparation of the first and second polymer cement plastering mortars in this comparative example, VAE-type redispersible latex and poly-α-methylstyrene resin were both replaced with equal amounts of acrylic redispersible latex powder. The rest are the same as in Example 2.

[0063] Experimental Example 1 The polymer cement-based reinforced composite extruded polystyrene backing boards prepared in Examples 1-13 and Comparative Examples 1-3 were subjected to the following performance tests: (1) Compressive strength test: The compressive strength (compressive strength) test shall be conducted in accordance with the test method in GB / T 8813-2020 "Determination of compressive properties of rigid foam plastics"; (2) Bending load test: The bending load (bending strength) was tested according to the method in GB / T 8812.2-2007 "Determination of bending properties of rigid foam plastics - Part 2: Determination of bending strength and apparent flexural modulus". The test speed was 20 mm / min. The test results are shown in Table 1.

[0064] Table 1 Performance test results of Examples 1-13 and Comparative Examples 1-3

[0065] As can be seen from Table 1, compared with Comparative Examples 1-3, the compressive strength and flexural load of the polymer cement-reinforced composite extruded polystyrene backing boards prepared in Examples 1-12 are improved. This indicates that the addition of redispersible latex powder and poly-α-methylstyrene resin to the polymer cement plastering layer of the polymer cement-reinforced composite extruded polystyrene backing board, and the combined use of the two, can improve the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board, making its compressive strength reach more than 350 kPa and its flexural load reach more than 850 N.

[0066] Compared with Examples 2-5, the compressive strength and flexural load of the polymer cement-reinforced composite extruded polystyrene backing boards prepared in Examples 6-7 were further improved, indicating that by limiting the content ratio of redispersible latex powder and poly-α-methylstyrene resin, when the weight ratio of redispersible latex powder and poly-α-methylstyrene resin is 3-4:1, the strength performance of the polymer cement-reinforced composite extruded polystyrene backing board can be further improved.

[0067] Compared with Examples 7-8 and Example 13, the compressive strength and flexural load of the polymer cement-reinforced composite extruded polystyrene backing boards prepared in Examples 9-12 were further improved. This indicates that adding microsilica powder and water-based fluorocarbon emulsion to the polymer cement plaster, and first treating the microsilica powder with water-based fluorocarbon emulsion before mixing with other components, can be more beneficial to improving the strength performance of the polymer cement-reinforced composite extruded polystyrene backing boards.

[0068] Experiment Example 2 The polymer cement-reinforced composite extruded polystyrene backing boards prepared in Examples 1-4 were subjected to the following performance tests: (1) Thermal conductivity test: The thermal conductivity was tested according to the test method in GB / T 10294-2008 "Determination of steady-state thermal resistance and related properties of thermal insulation materials by protective hot plate method". (2) Interlayer bond strength test: The interlayer bond strength test shall be conducted in accordance with the test method in GB / T 29906-2013 "Materials for Molded Polystyrene Board Thin Plaster Exterior Wall Insulation System"; (3) Dimensional stability: Dimensional stability was tested according to the test methods in GB / T 8811-2008 "Test Method for Dimensional Stability of Rigid Foamed Plastics"; The test results are shown in Table 2.

[0069] Table 2 Performance test results of Examples 1-4

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polymer cement-reinforced composite extruded polystyrene backing board, characterized in that, From top to bottom, it includes a first polymer cement plastering layer, an extruded polystyrene board core layer, and a second polymer cement plastering layer; The first polymer cement plaster layer and the second polymer cement plaster layer each have an independently embedded base reinforcement layer. The base reinforcement layer is bonded to the surface of the extruded polystyrene board core layer; The backing plate has a compressive strength ≥350kPa, a bending load ≥850N, and a thermal conductivity ≤0.029W / (m•K).

2. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 1, characterized in that, The thickness of the first polymer cement plaster layer and the second polymer cement plaster layer are each independently 2~6mm; The thickness of the extruded polystyrene board core layer is 8~50mm.

3. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 1, characterized in that, The base reinforcement layer includes one of alkali-resistant glass fiber mesh and polyester fiber nonwoven fabric.

4. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 1, characterized in that, The raw materials for the first polymer cement plaster layer and the second polymer cement plaster layer each independently comprise the following components in parts by weight: 45-65 parts cement, 25-45 parts quartz sand, 3-8 parts redispersible latex powder, 0.5-2.4 parts poly-α-methylstyrene resin, 0.2-1 parts additives, and 18-28 parts water.

5. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 4, characterized in that, The weight ratio of the redispersible latex powder to the poly-α-methylstyrene resin is 3~4:

1.

6. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 4, characterized in that, The redispersible latex powder includes one or both of VAE-type redispersible latex powder and acrylic redispersible latex powder.

7. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 4, characterized in that, The raw materials of the first polymer cement plaster layer and the second polymer cement plaster layer also include 5-8 parts of silica fume and 0.5-1.5 parts of water-based fluorocarbon emulsion.

8. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 4, characterized in that, The additives include 0.1 to 0.6 parts of water-retaining agent and 0.1 to 0.4 parts of early-strength agent.

9. The polymer cement-reinforced composite extruded polystyrene backing board according to claim 7, characterized in that, The first polymer cement plaster layer is obtained by first polymer cement plaster mortar; The second polymer cement plaster layer is obtained by second polymer cement plaster mortar; The preparation methods of both the first polymer cement plastering mortar and the second polymer cement plastering mortar include the following steps: The aqueous fluorocarbon emulsion is added to water, the silica powder is added, mixed, and dried to obtain composite silica powder; the redispersible latex powder and the poly-α-methylstyrene resin are blended, ball-milled, dispersed in water, the composite silica powder is added, and mixed once; cement, quartz sand and additives are added, and mixed a second time to obtain the first polymer cement plastering mortar or the second polymer cement plastering mortar.

10. A method for preparing a polymer cement-reinforced composite extruded polystyrene backing board, used to prepare the polymer cement-reinforced composite extruded polystyrene backing board as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. After applying an interface agent to the upper surface of the extruded polystyrene board core layer, apply the first polymer cement plastering mortar, lay the base reinforcement layer on the surface of the first polymer cement plastering mortar, press it to embed it into the interior of the first polymer cement plastering mortar, and adhere it to the upper surface of the extruded polystyrene board core layer to obtain a backing board semi-finished product. S2. After applying an interface agent to the lower surface of the extruded polystyrene board core layer in the semi-finished backing board, apply the second polymer cement plastering mortar, lay the base reinforcement layer on the surface of the second polymer cement plastering mortar, press it to embed it into the interior of the second polymer cement plastering mortar, and adhere it to the lower surface of the extruded polystyrene board core layer to obtain the polymer cement base reinforced composite extruded polystyrene backing board.

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