Fireproof insulation board and preparation method thereof

Abstract

The present invention provides a fireproof thermal insulation board and a preparation method thereof. In the preparation method, after inorganic materials such as nanographene are mixed to form fireproof particles, water glass and building adhesive are coated on the surface of the fireproof particles. This treatment form can make the surface of the fireproof particles sticky, and then inorganic materials such as nanographene can better adhere to polystyrene, enhance the bonding strength between polystyrene and the fireproof particles, and the prepared thermal insulation board is not easy to break or delaminate. In addition, nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether all have flame retardant properties, so that the prepared thermal insulation board not only has thermal insulation properties but also has fireproof properties. The preparation method of the fireproof thermal insulation board provided by the present invention is simple, easy to operate, and suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation boards and relates to a fireproof thermal insulation board and a preparation method thereof. Background Art

[0002] Insulation boards are usually made of polystyrene resin as raw material, other raw materials and polymers as auxiliary materials, and are prepared by injecting a catalyst while heating and mixing, and then extruding and molding to form a rigid foam plastic board.

[0003] Common types of insulation boards include polystyrene insulation boards, polyurethane insulation boards, etc. Among them, polystyrene insulation boards are divided into molded polystyrene boards (EPS molded boards) and extruded polystyrene boards (XPS extruded boards) according to different production processes. XPS extruded boards have a perfect closed-cell honeycomb structure, which makes XPS insulation boards have extremely low water absorption, low thermal conductivity, high compressive resistance and anti-aging properties. Therefore, XPS insulation boards have waterproof, moisture-proof and heat-insulating properties.

[0004] Although XPS insulation board has good thermal insulation performance, the fireproof performance of XPS insulation board is poor, and polystyrene particles need to be combined with inorganic materials to achieve Class A fireproof standards. The existing preparation method of fireproof XPS insulation board is usually to prepare polystyrene and inorganic materials by melt extrusion molding. However, polystyrene is an organic material, and its bonding force when combined with inorganic materials is not strong. When water seeps or vibrates, the fireproof XPS insulation board is prone to delamination or cracking. In particular, the structural strength of polystyrene and inorganic materials after melt extrusion molding will be lower, which seriously affects the performance of the product. Summary of the invention

[0005] The purpose of the present invention is to provide a fireproof thermal insulation board and a preparation method thereof, so as to solve the problem that the existing fireproof XPS thermal insulation board is prone to delamination or cracking.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a method for preparing a fireproof thermal insulation board, comprising:

[0008] S01: Mix nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether evenly to form fire-retardant particles.

[0009] Nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether are mixed uniformly to form fireproof particles. For the convenience of later coating, the particle size of the fireproof particles is preferably 0.1-1mm. In the present application, the weight proportions of nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether are: 7-15 parts of nanographene, 2-7 parts of bentonite, 7-15 parts of magnesium hydroxide, 20-30 parts of hydrotalcite, and 4-8 parts of methyl octabromoether. Among them, the role of each component is:

[0010] Nanographene is a new material with a single-layer two-dimensional honeycomb lattice structure of carbon atoms closely stacked by sp² hybridization, which has excellent optical, electrical and mechanical properties. Nanographene and polystyrene can significantly reduce the thermal resistance of the insulation board surface and improve the thermal performance of the insulation board when compounded. When the content of nanographene is 10%, the initial decomposition temperature of the nanographene / polystyrene composite material is about 38°C higher than that of pure polystyrene. In addition, nanographene itself is a flame retardant that can reduce the burning time of polystyrene, and nanographene and polystyrene can reduce gas entry, accelerate heat loss, and adsorb organic volatiles produced by combustion when compounded.

[0011] Bentonite is a clay rock with good barrier properties, mechanical properties, tensile stress, tensile strength, heat resistance, wear resistance, corrosion resistance, tear strength and chemical resistance, which can reduce the water absorption rate of the insulation board and improve the air tightness of the insulation board. The combination of bentonite and magnesium hydroxide can improve the flame retardant performance, significantly reduce melt dripping, significantly reduce flame intensity, and significantly extend the ignition time.

[0012] Hydrotalcite is an anionic layered double hydroxide with a large number of water molecules between the layers. The most common hydrotalcite is magnesium-aluminum hydrotalcite. When the temperature is 200°C, hydrotalcite will remove some of the interlayer water and maintain a good layer structure. When the temperature is 250-450°C, hydrotalcite will decompose the hydroxyl OH and carbonic acid groups in the structure to produce water vapor and CO2. When the temperature is greater than 550°C, the hydroxyl groups in the hydrotalcite will be completely decomposed, and the hydrotalcite will be transformed into a magnesium-aluminum mixed oxide. During the three thermal decomposition processes, the magnesium-aluminum hydrotalcite can work at both low and high temperatures and produce more water vapor and carbon dioxide, thereby producing a better flame retardant effect. In particular, the presence of carbonate in magnesium-aluminum hydrotalcite makes hydrotalcite have a better smoke suppression effect than aluminum hydroxide or magnesium hydroxide. In addition, hydrotalcite also has a lamellar structure that aluminum hydroxide and magnesium hydroxide do not have. The lamellar structure can absorb more smoke and carbon, thereby producing a better smoke suppression effect. The lamellar structure of the hydrotalcite after complete dehydration can provide better high-temperature thermal insulation performance for the insulation board.

[0013] Methyl octabromoether is a flame retardant with the characteristics of small dosage, good flame retardant effect, and little impact on the physical properties of materials. It can show excellent performance when used in XPS insulation boards.

[0014] S02: The fireproof particles, water glass and building adhesive are mixed evenly to form coated particles whose surfaces are covered with the building adhesive and the water glass.

[0015] After mixing water glass and construction glue evenly, add fireproof particles and stir evenly to form coated particles with construction glue and water glass covering the surface of the fireproof particles. Among them, the mass parts of water glass and construction glue are 10-20 parts and 20-30 parts respectively. Water glass is an aqueous solution of sodium silicate, which appears as a viscous liquid and has viscosity, and can be used as an adhesive. After water glass is applied to the surface of an object and dries, it presents a glass-like film and has fire resistance. Construction glue is a commonly used glue in construction projects, mainly used for bonding boards, wall pretreatment, etc. Commonly used construction glues include epoxy construction glue, polyurethane construction glue, acrylic construction glue, etc.

[0016] In the present application, the surface of the fireproof particles is coated with a layer of colloid formed by a mixture of water glass and building adhesive, which makes the surface of the fireproof particles sticky, thereby enabling better adhesion with polystyrene, thereby enhancing the bonding strength between polystyrene and the fireproof particles, and the prepared insulation board is not easy to break or delaminate.

[0017] S03: The polystyrene and the coated particles are mixed and added into a twin-screw extruder, and heated and pressurized to melt to obtain a molten mixture.

[0018] The polystyrene and the coated particles coated with colloid are mixed and added into the first screw extruder, and heated and pressurized to melt the polystyrene and the coated particles. The mass fraction of the polystyrene is 70-90 parts.

[0019] In the present application, the melt pressure of the first screw extruder is 4-30 MPa, and the heating temperature is 200-230° C. The first screw extruder includes seven working sections, wherein the first to third working sections are temperature rising and melting sections, which are used to heat and melt the polystyrene and the coated particles; the fourth and fifth working sections are melt pressurized mixing sections, which are used to initially melt the polystyrene and the coated particles; the sixth and seventh working sections are high temperature and high pressure mixing sections, which are used to melt the polystyrene and the coated particles at high temperature to obtain a molten mixture.

[0020] Among them, the working pressure of the first working section is 4-5MPa, and the working temperature is 120-140℃; the working pressure of the second working section is 4-5MPa, and the working temperature is 150-160℃; the working pressure of the third working section is 4-5MPa, and the working temperature is 180-190℃; the working pressure of the fourth working section is 8-10MPa, and the working temperature is 200-210℃; the working pressure of the fifth working section is 12-15MPa, and the working temperature is 210-220℃; the working pressure of the sixth working section is 20-25MPa, and the working temperature is 220-230℃; the working pressure of the seventh working section is 25-30MPa, and the working temperature is 210-220℃. The outlet pressure of the first screw extruder is 20MPa and the outlet temperature is 200℃.

[0021] S04: adding the carbon dioxide foaming agent into the molten mixture at the end of the first screw extruder, entering the molten mixture into the second screw extruder through the outlet of the first screw extruder, extruding and molding in the second screw extruder, and obtaining the fireproof insulation board after shaping and cutting.

[0022] The outlet of the first screw extruder is connected to the inlet of the second screw extruder to facilitate the flow of materials. A carbon dioxide foaming agent is added to the end of the seventh working section in the first screw extruder to mix the carbon dioxide foaming agent and the molten mixture, wherein the feed mass flow rate of the carbon dioxide foaming agent is 0.5-1%. The carbon dioxide foaming agent and the molten mixture enter the second screw extruder together and are melt-mixed by the second screw extruder. Extrusion molding is performed through the extrusion die head installed at the end of the second screw extruder, and finally, a fireproof insulation board is obtained after shaping and cutting. In the present application, the mass fraction of the carbon dioxide foaming agent is 7-16 parts.

[0023] In the present application, the melt pressure of the second screw extruder is 7-25MPa, and the heating temperature is 50-160°C. The second screw extruder includes five working sections, wherein the first to third working sections are cooling and decompression zones, which are used to cool and decompress the carbon dioxide foaming agent and the molten mixture; the fourth working section is a mechanical dynamic mixing zone, which is used to mechanically mix the carbon dioxide foaming agent and the molten mixture using a screw; and the fifth working section is a static mixing zone, which is used to statically mix the carbon dioxide foaming agent and the molten mixture.

[0024] Among them, the working pressure of the first working section is 18-20MPa, and the working temperature is 150-160℃; the working pressure of the second working section is 22-25MPa, and the working temperature is 80-90℃; the working pressure of the third working section is 18-20MPa, and the working temperature is 60-70℃; the working pressure of the fourth working section is 15-18MPa, and the working temperature is 50-60℃; the working pressure of the fifth working section is 10-12MPa, and the working temperature is 90-100℃; the die temperature of the extrusion die is 100-110℃, and the expansion release pressure is 7-15MPa.

[0025] The present invention also provides a fireproof insulation board, which is prepared by the above-mentioned preparation method. The raw materials for preparing the fireproof insulation board provided by the present invention include polystyrene, nanographene, bentonite, magnesium hydroxide, hydrotalcite, water glass, carbon dioxide foaming agent, methyl octabromoether and building glue, and the mass ratio is as follows: polystyrene 70-90 parts, nanographene 7-15 parts, bentonite 2-7 parts, magnesium hydroxide 7-15 parts, hydrotalcite 20-30 parts, water glass 10-20 parts, carbon dioxide foaming agent 7-16 parts, methyl octabromoether 4-8 parts and building glue 20-30 parts. Preferably, the raw materials for preparing the fireproof insulation board include as follows: polystyrene 85 parts, nanographene 12 parts, bentonite 5 parts, magnesium hydroxide 12 parts, hydrotalcite 25 parts, water glass 17 parts, carbon dioxide foaming agent 12 parts, methyl octabromoether 6 parts and building glue 25 parts.

[0026] The present invention has the following beneficial effects:

[0027] The present invention provides a fireproof insulation board and a preparation method, the preparation method comprising: mixing nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether evenly to form fireproof particles; the fireproof particles, water glass and building glue are evenly mixed to form coated particles whose surfaces are covered with the building glue and the water glass; polystyrene and the coated particles are mixed and added to a first screw extruder, heated and pressurized to melt, and a molten mixture is obtained; a carbon dioxide foaming agent is added to the molten mixture at the end of the first screw extruder, and enters the second screw extruder through the outlet of the first screw extruder, extruded and formed in the second screw extruder, and a fireproof insulation board is obtained after shaping and cutting. In the preparation method, after inorganic materials such as nanographene are mixed to form fireproof particles, water glass and building glue are coated on the surface of the fireproof particles. This treatment form can make the surface of the fireproof particles sticky, and then inorganic materials such as nanographene can better bond with polystyrene, enhance the bonding strength between polystyrene and fireproof particles, and the prepared insulation board is not easy to break or delaminate. In addition, nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether all have flame retardant properties, so that the prepared insulation board not only has insulation properties but also fireproof properties. The preparation method of the fireproof insulation board provided by the present invention is simple, easy to operate, and suitable for industrial production. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further explained and illustrated by means of specific embodiments below.

[0029] Example 1

[0030] The embodiment of the present application provides a fireproof insulation board, and the raw materials for preparing the fireproof insulation board include, by weight: 85 parts of polystyrene, 12 parts of nano-graphene, 5 parts of bentonite, 12 parts of magnesium hydroxide, 25 parts of hydrotalcite, 17 parts of water glass, 12 parts of carbon dioxide foaming agent, 6 parts of methyl octabromoether and 25 parts of building adhesive.

[0031] The present application also provides a method for preparing a fireproof insulation board, the method comprising:

[0032] S101: 12 parts of nanographene, 5 parts of bentonite, 12 parts of magnesium hydroxide, 25 parts of hydrotalcite and 6 parts of methyl octabromoether were mixed uniformly to obtain fireproof particles with a particle size of 0.1 mm.

[0033] S102: After 17 parts of water glass and 25 parts of building glue are evenly mixed, fireproof particles are added and stirred evenly to form coated particles whose surfaces are covered with building glue and water glass.

[0034] S103: 85 parts of polystyrene and coated particles coated with colloid are mixed and added to the first screw extruder, heated and pressurized to melt, and obtain a molten mixture. Among them, the working pressure of the first working section of the first screw extruder is 5MPa and the working temperature is 130℃; the working pressure of the second working section is 5MPa and the working temperature is 155℃; the working pressure of the third working section is 5MPa and the working temperature is 185℃; the working pressure of the fourth working section is 9MPa and the working temperature is 205℃; the working pressure of the fifth working section is 13MPa and the working temperature is 215℃; the working pressure of the sixth working section is 22MPa and the working temperature is 225℃; the working pressure of the seventh working section is 28MPa and the working temperature is 215℃. The outlet pressure of the first screw extruder is 20MPa and the outlet temperature is 200℃.

[0035] S104: 12 parts of carbon dioxide foaming agent are added to the molten mixture at the end of the first screw extruder at a feed mass flow rate of 0.7%, and enter the second screw extruder through the outlet of the first screw extruder, extruded and formed in the second screw extruder, and obtained the fireproof insulation board after shaping and cutting. Among them, the working pressure of the first working section of the second screw extruder is 19MPa and the working temperature is 155℃; the working pressure of the second working section is 24MPa and the working temperature is 85℃; the working pressure of the third working section is 19MPa and the working temperature is 65℃; the working pressure of the fourth working section is 17MPa and the working temperature is 55℃; the working pressure of the fifth working section is 11MPa and the working temperature is 95℃; the die head temperature of the extrusion die is 105℃, and the expansion release pressure is 10MPa.

[0036] Example 2

[0037] The embodiment of the present application provides a fireproof insulation board. The raw materials for preparing the fireproof insulation board include, by weight: 70 parts of polystyrene, 7 parts of nano-graphene, 2 parts of bentonite, 7 parts of magnesium hydroxide, 20 parts of hydrotalcite, 10 parts of water glass, 7 parts of carbon dioxide foaming agent, 4 parts of methyl octabromoether and 20 parts of building adhesive.

[0038] The present application also provides a method for preparing a fireproof insulation board, the method comprising:

[0039] S201: 7 parts of nanographene, 2 parts of bentonite, 7 parts of magnesium hydroxide, 20 parts of hydrotalcite and 4 parts of methyl octabromoether are mixed uniformly to obtain fireproof particles with a particle size of 1 mm.

[0040] S202: After 10 parts of water glass and 20 parts of building glue are mixed evenly, fireproof particles are added and stirred evenly to form coated particles whose surfaces are covered with building glue and water glass.

[0041] S203: Mix 70 parts of polystyrene and coated particles with surface coating colloid, add them into the first screw extruder, heat and pressurize to melt, and obtain a molten mixture. Among them, the working pressure of the first working section of the first screw extruder is 4MPa, and the working temperature is 120℃; the working pressure of the second working section is 4MPa, and the working temperature is 150℃; the working pressure of the third working section is 4MPa, and the working temperature is 180℃; the working pressure of the fourth working section is 8MPa, and the working temperature is 200℃; the working pressure of the fifth working section is 12MPa, and the working temperature is 210℃; the working pressure of the sixth working section is 20MPa, and the working temperature is 220℃; the working pressure of the seventh working section is 25MPa, and the working temperature is 210℃. The outlet pressure of the first screw extruder is 20MPa and the outlet temperature is 200℃.

[0042] S204: 7 parts of carbon dioxide foaming agent are added to the molten mixture at the end of the first screw extruder at a feed mass flow rate of 0.5%, and enter the second screw extruder through the outlet of the first screw extruder, and are extruded and formed in the second screw extruder, and the fireproof insulation board is obtained after shaping and cutting. Among them, the working pressure of the first working section of the second screw extruder is 18MPa, and the working temperature is 150℃; the working pressure of the second working section is 22MPa, and the working temperature is 80℃; the working pressure of the third working section is 18MPa, and the working temperature is 60℃; the working pressure of the fourth working section is 15MPa, and the working temperature is 50℃; the working pressure of the fifth working section is 10MPa, and the working temperature is 90℃; the die head temperature of the extrusion die is 100℃, and the expansion release pressure is 7MPa.

[0043] Example 3

[0044] The embodiment of the present application provides a fireproof insulation board, and the raw materials for preparing the fireproof insulation board include, by weight: 90 parts of polystyrene, 15 parts of nano-graphene, 7 parts of bentonite, 15 parts of magnesium hydroxide, 30 parts of hydrotalcite, 20 parts of water glass, 16 parts of carbon dioxide foaming agent, 8 parts of methyl octabromoether and 30 parts of building adhesive.

[0045] The present application also provides a method for preparing a fireproof insulation board, the method comprising:

[0046] S301: 15 parts of nanographene, 7 parts of bentonite, 15 parts of magnesium hydroxide, 30 parts of hydrotalcite and 8 parts of methyl octabromoether are mixed uniformly to obtain fireproof particles with a particle size of 0.5 mm.

[0047] S302: After 20 parts of water glass and 30 parts of building glue are evenly mixed, fireproof particles are added and stirred evenly to form coated particles whose surfaces are covered with building glue and water glass.

[0048] S303: Mix 90 parts of polystyrene and coated particles with surface coating colloid, add them into the first screw extruder, heat and pressurize to melt, and obtain a molten mixture. Among them, the working pressure of the first working section of the first screw extruder is 5MPa, and the working temperature is 140℃; the working pressure of the second working section is 5MPa, and the working temperature is 160℃; the working pressure of the third working section is 5MPa, and the working temperature is 190℃; the working pressure of the fourth working section is 10MPa, and the working temperature is 210℃; the working pressure of the fifth working section is 15MPa, and the working temperature is 220℃; the working pressure of the sixth working section is 25MPa, and the working temperature is 230℃; the working pressure of the seventh working section is 30MPa, and the working temperature is 220℃. The outlet pressure of the first screw extruder is 20MPa and the outlet temperature is 200℃.

[0049] S304: 16 parts of carbon dioxide foaming agent are added to the molten mixture at the end of the first screw extruder at a feed mass flow rate of 1%, and enter the second screw extruder through the outlet of the first screw extruder, extruded and formed in the second screw extruder, and obtained the fireproof insulation board after shaping and cutting. Among them, the working pressure of the first working section of the second screw extruder is 20MPa and the working temperature is 160℃; the working pressure of the second working section is 25MPa and the working temperature is 90℃; the working pressure of the third working section is 20MPa and the working temperature is 70℃; the working pressure of the fourth working section is 18MPa and the working temperature is 60℃; the working pressure of the fifth working section is 12MPa and the working temperature is 100℃; the die head temperature of the extrusion die is 110℃, and the expansion release pressure is 15MPa.

[0050] Example 4

[0051] The embodiment of the present application provides a fireproof insulation board, and the raw materials for preparing the fireproof insulation board include, by weight: 85 parts of polystyrene, 10 parts of nano-graphene, 6 parts of bentonite, 10 parts of magnesium hydroxide, 28 parts of hydrotalcite, 16 parts of water glass, 10 parts of carbon dioxide foaming agent, 7 parts of methyl octabromoether and 22 parts of building adhesive.

[0052] The present application also provides a method for preparing a fireproof insulation board, the method comprising:

[0053] S401: 10 parts of nanographene, 6 parts of bentonite, 10 parts of magnesium hydroxide, 28 parts of hydrotalcite and 7 parts of methyl octabromoether are mixed uniformly to obtain fireproof particles with a particle size of 0.2 mm.

[0054] S402: After 16 parts of water glass and 22 parts of building glue are evenly mixed, fireproof particles are added and stirred evenly to form coated particles whose surfaces are covered with building glue and water glass.

[0055] S403: 85 parts of polystyrene and coated particles coated with colloid are mixed and added to the first screw extruder, heated and pressurized to melt, and obtain a molten mixture. Among them, the working pressure of the first working section of the first screw extruder is 5MPa and the working temperature is 120℃; the working pressure of the second working section is 5MPa and the working temperature is 155℃; the working pressure of the third working section is 5MPa and the working temperature is 185℃; the working pressure of the fourth working section is 9MPa and the working temperature is 208℃; the working pressure of the fifth working section is 14MPa and the working temperature is 215℃; the working pressure of the sixth working section is 22MPa and the working temperature is 228℃; the working pressure of the seventh working section is 28MPa and the working temperature is 218℃. The outlet pressure of the first screw extruder is 20MPa and the outlet temperature is 200℃.

[0056] S404: 10 parts of carbon dioxide foaming agent are added to the molten mixture at the end of the first screw extruder at a feed mass flow rate of 0.8%, and enter the second screw extruder through the outlet of the first screw extruder, extruded and formed in the second screw extruder, and obtained the fireproof insulation board after shaping and cutting. Among them, the working pressure of the first working section of the second screw extruder is 19MPa and the working temperature is 156℃; the working pressure of the second working section is 24MPa and the working temperature is 86℃; the working pressure of the third working section is 18MPa and the working temperature is 67℃; the working pressure of the fourth working section is 16MPa and the working temperature is 56℃; the working pressure of the fifth working section is 10MPa and the working temperature is 94℃; the die head temperature of the extrusion die is 104℃, and the expansion release pressure is 12MPa.

[0057] Comparative Example 1

[0058] All components of the fireproof and heat-insulating board provided in Example 1 are mixed and added into a twin-screw extruder, and heated and pressurized under the conditions of a melt pressure of 10 MPa and a heating temperature of 180° C., and extruded to obtain a fireproof and heat-insulating board.

[0059] Comparative Example 2

[0060] The difference from Example 1 is that no hydrotalcite is added.

[0061] Comparative Example 3

[0062] The difference from Example 1 is that water glass and construction adhesive are not added.

[0063] The fireproof insulation board prepared in Example 1 and Comparative Examples 1-3 and the common polystyrene insulation board were tested for thermal conductivity, oxygen index, density, compressive strength, tensile strength, closed porosity, pore diameter and combustion performance, respectively, and the test data shown in Table 1 were obtained. At the same time, the fireproof insulation board prepared in Example 1 and Comparative Examples 1-3 and the common polystyrene insulation board were exposed to the sun for 30 days, cut and observed the internal structure, and the test data shown in Table 1 were obtained.

[0064] Table 1: Test data of fireproof insulation boards prepared in Example 1 and Comparative Examples 1-3

[0065]

[0066] As can be seen from Table 1, the thermal conductivity, oxygen index, density, compressive strength, tensile strength and other properties of the fireproof insulation board provided in Example 1 of the present application are better than those of the fireproof insulation board and ordinary polystyrene insulation board prepared in Comparative Examples 1-3, and the closed-cell rate and pore diameter are smaller. In addition, the combustion performance of the fireproof insulation board provided in Example 1 of the present application reaches Class A, and after exposure to the sun, the interior is tight, without stratification or cracking.

[0067] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fireproof insulation board, characterized in that: The raw materials for preparation include, by weight: 85 parts of polystyrene, 12 parts of nanographene, 5 parts of bentonite, 12 parts of magnesium hydroxide, 25 parts of hydrotalcite, 17 parts of water glass, 12 parts of carbon dioxide foaming agent, 6 parts of methyl octabromoether and 25 parts of building adhesive; the combustion performance grade of the fireproof insulation board is Class A; the interior of the fireproof insulation board is tight and has no stratification; The preparation method of the fireproof insulation board comprises: The nanographene, bentonite, magnesium hydroxide, hydrotalcite and methyl octabromoether are uniformly mixed to form fireproof particles with a particle size of 0.5-1 mm; After the water glass and the building glue are evenly mixed, the fireproof particles are added and stirred evenly to form coated particles whose surfaces are covered with the building glue and the water glass; The polystyrene and the coated particles are mixed and added into a first screw extruder, and heated and pressurized to melt to obtain a molten mixture; The carbon dioxide foaming agent is added into the molten mixture at the end of the first screw extruder, enters the second screw extruder through the outlet of the first screw extruder, is extruded and formed in the second screw extruder, and is shaped and cut to obtain a fireproof insulation board.

2. The fireproof insulation board according to claim 1, characterized in that: The melt pressure of the first screw extruder is 4-30 MPa, and the heating temperature is 200-230°C.

3. The fireproof insulation board according to claim 2, characterized in that: The first screw extruder includes seven working sections, wherein: The working pressure of the first working section is 4-5MPa and the working temperature is 120-140℃; The working pressure of the second working section is 4-5MPa and the working temperature is 150-160℃; The working pressure of the third working section is 4-5MPa and the working temperature is 180-190℃; The working pressure of the fourth working section is 8-10MPa and the working temperature is 200-210℃; The working pressure of the fifth working section is 12-15MPa and the working temperature is 210-220℃; The working pressure of the sixth working section is 20-25MPa and the working temperature is 220-230℃; The working pressure of the seventh working section is 25-30MPa, and the working temperature is 210-220℃.

4. The fireproof insulation board according to claim 1, characterized in that: The feed mass flow rate of the carbon dioxide foaming agent is 0.5-1%.

5. The fireproof insulation board according to claim 1, characterized in that: The outlet pressure of the first screw extruder is 20 MPa and the outlet temperature is 200°C.

6. The fireproof insulation board according to claim 1, characterized in that: The melt pressure of the second screw extruder is 7-25 MPa, and the heating temperature is 50-160°C.

7. The fireproof insulation board according to claim 6, characterized in that: The second screw extruder includes five working sections, wherein: The working pressure of the first working section is 18-20MPa and the working temperature is 150-160℃; The working pressure of the second working section is 22-25MPa and the working temperature is 80-90℃; The working pressure of the third working section is 18-20MPa and the working temperature is 60-70℃; The working pressure of the fourth working section is 15-18MPa and the working temperature is 50-60℃; The working pressure of the fifth working section is 10-12MPa and the working temperature is 90-100℃; An extrusion die is installed at the end of the second screw extruder, the die temperature is 100-110° C., and the expansion release pressure is 7-15 MPa.

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